drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90 static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  93
  94 static DEFINE_IDA(iscsi_sess_ida);
  95 /*
  96  * list of registered transports and lock that must
  97  * be held while accessing list. The iscsi_transport_lock must
  98  * be acquired after the rx_queue_mutex.
  99  */
 100 static LIST_HEAD(iscsi_transports);
 101 static DEFINE_SPINLOCK(iscsi_transport_lock);
 102
 103 #define to_iscsi_internal(tmpl) \
 104         container_of(tmpl, struct iscsi_internal, t)
 105
 106 #define dev_to_iscsi_internal(_dev) \
 107         container_of(_dev, struct iscsi_internal, dev)
 108
 109 static void iscsi_transport_release(struct device *dev)
 110 {
 111         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 112         kfree(priv);
 113 }
 114
 115 /*
 116  * iscsi_transport_class represents the iscsi_transports that are
 117  * registered.
 118  */
 119 static struct class iscsi_transport_class = {
 120         .name = "iscsi_transport",
 121         .dev_release = iscsi_transport_release,
 122 };
 123
 124 static ssize_t
 125 show_transport_handle(struct device *dev, struct device_attribute *attr,
 126                       char *buf)
 127 {
 128         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 129
 130         if (!capable(CAP_SYS_ADMIN))
 131                 return -EACCES;
 132         return sysfs_emit(buf, "%llu\n",
 133                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 134 }
 135 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 136
 137 #define show_transport_attr(name, format)                               \
 138 static ssize_t                                                          \
 139 show_transport_##name(struct device *dev,                               \
 140                       struct device_attribute *attr,char *buf)          \
 141 {                                                                       \
 142         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 143         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 144 }                                                                       \
 145 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 146
 147 show_transport_attr(caps, "0x%x");
 148
 149 static struct attribute *iscsi_transport_attrs[] = {
 150         &dev_attr_handle.attr,
 151         &dev_attr_caps.attr,
 152         NULL,
 153 };
 154
 155 static struct attribute_group iscsi_transport_group = {
 156         .attrs = iscsi_transport_attrs,
 157 };
 158
 159 /*
 160  * iSCSI endpoint attrs
 161  */
 162 #define iscsi_dev_to_endpoint(_dev) \
 163         container_of(_dev, struct iscsi_endpoint, dev)
 164
 165 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 166 struct device_attribute dev_attr_##_prefix##_##_name =  \
 167         __ATTR(_name,_mode,_show,_store)
 168
 169 static void iscsi_endpoint_release(struct device *dev)
 170 {
 171         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 172         kfree(ep);
 173 }
 174
 175 static struct class iscsi_endpoint_class = {
 176         .name = "iscsi_endpoint",
 177         .dev_release = iscsi_endpoint_release,
 178 };
 179
 180 static ssize_t
 181 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 182 {
 183         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 184         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 185 }
 186 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 187
 188 static struct attribute *iscsi_endpoint_attrs[] = {
 189         &dev_attr_ep_handle.attr,
 190         NULL,
 191 };
 192
 193 static struct attribute_group iscsi_endpoint_group = {
 194         .attrs = iscsi_endpoint_attrs,
 195 };
 196
 197 #define ISCSI_MAX_EPID -1
 198
 199 static int iscsi_match_epid(struct device *dev, const void *data)
 200 {
 201         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 202         const uint64_t *epid = data;
 203
 204         return *epid == ep->id;
 205 }
 206
 207 struct iscsi_endpoint *
 208 iscsi_create_endpoint(int dd_size)
 209 {
 210         struct device *dev;
 211         struct iscsi_endpoint *ep;
 212         uint64_t id;
 213         int err;
 214
 215         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 216                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 217                                         iscsi_match_epid);
 218                 if (!dev)
 219                         break;
 220                 else
 221                         put_device(dev);
 222         }
 223         if (id == ISCSI_MAX_EPID) {
 224                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 225                        ISCSI_MAX_EPID - 1);
 226                 return NULL;
 227         }
 228
 229         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 230         if (!ep)
 231                 return NULL;
 232
 233         ep->id = id;
 234         ep->dev.class = &iscsi_endpoint_class;
 235         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 236         err = device_register(&ep->dev);
 237         if (err)
 238                 goto free_ep;
 239
 240         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 241         if (err)
 242                 goto unregister_dev;
 243
 244         if (dd_size)
 245                 ep->dd_data = &ep[1];
 246         return ep;
 247
 248 unregister_dev:
 249         device_unregister(&ep->dev);
 250         return NULL;
 251
 252 free_ep:
 253         kfree(ep);
 254         return NULL;
 255 }
 256 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 257
 258 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 259 {
 260         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 261         device_unregister(&ep->dev);
 262 }
 263 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 264
 265 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 266 {
 267         put_device(&ep->dev);
 268 }
 269 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 270
 271 /**
 272  * iscsi_lookup_endpoint - get ep from handle
 273  * @handle: endpoint handle
 274  *
 275  * Caller must do a iscsi_put_endpoint.
 276  */
 277 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 278 {
 279         struct device *dev;
 280
 281         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 282                                 iscsi_match_epid);
 283         if (!dev)
 284                 return NULL;
 285
 286         return iscsi_dev_to_endpoint(dev);
 287 }
 288 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 289
 290 /*
 291  * Interface to display network param to sysfs
 292  */
 293
 294 static void iscsi_iface_release(struct device *dev)
 295 {
 296         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 297         struct device *parent = iface->dev.parent;
 298
 299         kfree(iface);
 300         put_device(parent);
 301 }
 302
 303
 304 static struct class iscsi_iface_class = {
 305         .name = "iscsi_iface",
 306         .dev_release = iscsi_iface_release,
 307 };
 308
 309 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 310 struct device_attribute dev_attr_##_prefix##_##_name =          \
 311         __ATTR(_name, _mode, _show, _store)
 312
 313 /* iface attrs show */
 314 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 315 static ssize_t                                                          \
 316 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 317                      char *buf)                                         \
 318 {                                                                       \
 319         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 320         struct iscsi_transport *t = iface->transport;                   \
 321         return t->get_iface_param(iface, param_type, param, buf);       \
 322 }                                                                       \
 323
 324 #define iscsi_iface_net_attr(type, name, param)                         \
 325         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 326 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 327
 328 #define iscsi_iface_attr(type, name, param)                             \
 329         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 330 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 331
 332 /* generic read only ipv4 attribute */
 333 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 334 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 335 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 336 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 337 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 338                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 339 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 340                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 341 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 342 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 343 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 344                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 345 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 346                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 347 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 348                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 349 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 350                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 351 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 352                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 353 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 354                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 355 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 356                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 357 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 358                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 359 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 360                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 361 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 362
 363 /* generic read only ipv6 attribute */
 364 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 365 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 366                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 367 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 368 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 369                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 370 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 371                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 372 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 373                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 374 iscsi_iface_net_attr(ipv6_iface, router_state,
 375                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 376 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 377                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 378 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 379 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 380 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 381                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 382 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 383 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 384                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 385 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 386                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 387 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 388                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 389 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 390                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 391 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 392                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 393
 394 /* common read only iface attribute */
 395 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 396 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 397 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 398 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 399 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 400 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 401 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 402 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 403 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 404                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 405 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 406 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 407 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 408 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 409 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 410 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 411
 412 /* common iscsi specific settings attributes */
 413 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 414 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 415 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 416 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 417 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 418 iscsi_iface_attr(iface, data_seq_in_order,
 419                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 420 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 421 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 422 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 423 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 424 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 425 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 426 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 427 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 428 iscsi_iface_attr(iface, discovery_auth_optional,
 429                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 430 iscsi_iface_attr(iface, discovery_logout,
 431                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 432 iscsi_iface_attr(iface, strict_login_comp_en,
 433                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 434 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 435
 436 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 437                                           struct attribute *attr, int i)
 438 {
 439         struct device *dev = container_of(kobj, struct device, kobj);
 440         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 441         struct iscsi_transport *t = iface->transport;
 442         int param = -1;
 443
 444         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 445                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 446         else if (attr == &dev_attr_iface_header_digest.attr)
 447                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 448         else if (attr == &dev_attr_iface_data_digest.attr)
 449                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 450         else if (attr == &dev_attr_iface_immediate_data.attr)
 451                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 452         else if (attr == &dev_attr_iface_initial_r2t.attr)
 453                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 454         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 455                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 456         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 457                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 458         else if (attr == &dev_attr_iface_erl.attr)
 459                 param = ISCSI_IFACE_PARAM_ERL;
 460         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 461                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 462         else if (attr == &dev_attr_iface_first_burst_len.attr)
 463                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 464         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 465                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 466         else if (attr == &dev_attr_iface_max_burst_len.attr)
 467                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 468         else if (attr == &dev_attr_iface_chap_auth.attr)
 469                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 470         else if (attr == &dev_attr_iface_bidi_chap.attr)
 471                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 472         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 473                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 474         else if (attr == &dev_attr_iface_discovery_logout.attr)
 475                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 476         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 477                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 478         else if (attr == &dev_attr_iface_initiator_name.attr)
 479                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 480
 481         if (param != -1)
 482                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 483
 484         if (attr == &dev_attr_iface_enabled.attr)
 485                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 486         else if (attr == &dev_attr_iface_vlan_id.attr)
 487                 param = ISCSI_NET_PARAM_VLAN_ID;
 488         else if (attr == &dev_attr_iface_vlan_priority.attr)
 489                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 490         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 491                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 492         else if (attr == &dev_attr_iface_mtu.attr)
 493                 param = ISCSI_NET_PARAM_MTU;
 494         else if (attr == &dev_attr_iface_port.attr)
 495                 param = ISCSI_NET_PARAM_PORT;
 496         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 497                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 498         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 499                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 500         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 501                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 502         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 503                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 504         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 505                 param = ISCSI_NET_PARAM_TCP_WSF;
 506         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 507                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 508         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 509                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 510         else if (attr == &dev_attr_iface_cache_id.attr)
 511                 param = ISCSI_NET_PARAM_CACHE_ID;
 512         else if (attr == &dev_attr_iface_redirect_en.attr)
 513                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 514         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 515                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 517                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_GW;
 519                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 521                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 522                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 523                 else if (attr ==
 524                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 526                 else if (attr ==
 527                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 529                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 531                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 532                         param = ISCSI_NET_PARAM_IPV4_TOS;
 533                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 534                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 535                 else if (attr ==
 536                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 538                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 543                 else if (attr ==
 544                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 545                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 546                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 551                 else if (attr ==
 552                          &dev_attr_ipv4_iface_fragment_disable.attr)
 553                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 554                 else if (attr ==
 555                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 556                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 557                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 558                         param = ISCSI_NET_PARAM_IPV4_TTL;
 559                 else
 560                         return 0;
 561         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 562                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 564                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 566                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 568                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 570                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 572                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 574                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 575                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 576                 else if (attr ==
 577                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 579                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 581                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 583                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 584                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 585                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 586                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 587                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 588                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 589                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 590                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 591                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 592                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 593                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 594                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 595                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 596                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 597                 else
 598                         return 0;
 599         } else {
 600                 WARN_ONCE(1, "Invalid iface attr");
 601                 return 0;
 602         }
 603
 604         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 605 }
 606
 607 static struct attribute *iscsi_iface_attrs[] = {
 608         &dev_attr_iface_enabled.attr,
 609         &dev_attr_iface_vlan_id.attr,
 610         &dev_attr_iface_vlan_priority.attr,
 611         &dev_attr_iface_vlan_enabled.attr,
 612         &dev_attr_ipv4_iface_ipaddress.attr,
 613         &dev_attr_ipv4_iface_gateway.attr,
 614         &dev_attr_ipv4_iface_subnet.attr,
 615         &dev_attr_ipv4_iface_bootproto.attr,
 616         &dev_attr_ipv6_iface_ipaddress.attr,
 617         &dev_attr_ipv6_iface_link_local_addr.attr,
 618         &dev_attr_ipv6_iface_router_addr.attr,
 619         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 620         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 621         &dev_attr_iface_mtu.attr,
 622         &dev_attr_iface_port.attr,
 623         &dev_attr_iface_ipaddress_state.attr,
 624         &dev_attr_iface_delayed_ack_en.attr,
 625         &dev_attr_iface_tcp_nagle_disable.attr,
 626         &dev_attr_iface_tcp_wsf_disable.attr,
 627         &dev_attr_iface_tcp_wsf.attr,
 628         &dev_attr_iface_tcp_timer_scale.attr,
 629         &dev_attr_iface_tcp_timestamp_en.attr,
 630         &dev_attr_iface_cache_id.attr,
 631         &dev_attr_iface_redirect_en.attr,
 632         &dev_attr_iface_def_taskmgmt_tmo.attr,
 633         &dev_attr_iface_header_digest.attr,
 634         &dev_attr_iface_data_digest.attr,
 635         &dev_attr_iface_immediate_data.attr,
 636         &dev_attr_iface_initial_r2t.attr,
 637         &dev_attr_iface_data_seq_in_order.attr,
 638         &dev_attr_iface_data_pdu_in_order.attr,
 639         &dev_attr_iface_erl.attr,
 640         &dev_attr_iface_max_recv_dlength.attr,
 641         &dev_attr_iface_first_burst_len.attr,
 642         &dev_attr_iface_max_outstanding_r2t.attr,
 643         &dev_attr_iface_max_burst_len.attr,
 644         &dev_attr_iface_chap_auth.attr,
 645         &dev_attr_iface_bidi_chap.attr,
 646         &dev_attr_iface_discovery_auth_optional.attr,
 647         &dev_attr_iface_discovery_logout.attr,
 648         &dev_attr_iface_strict_login_comp_en.attr,
 649         &dev_attr_iface_initiator_name.attr,
 650         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 651         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 652         &dev_attr_ipv4_iface_tos_en.attr,
 653         &dev_attr_ipv4_iface_tos.attr,
 654         &dev_attr_ipv4_iface_grat_arp_en.attr,
 655         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 656         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 657         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 658         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 659         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 660         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 661         &dev_attr_ipv4_iface_fragment_disable.attr,
 662         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 663         &dev_attr_ipv4_iface_ttl.attr,
 664         &dev_attr_ipv6_iface_link_local_state.attr,
 665         &dev_attr_ipv6_iface_router_state.attr,
 666         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 667         &dev_attr_ipv6_iface_mld_en.attr,
 668         &dev_attr_ipv6_iface_flow_label.attr,
 669         &dev_attr_ipv6_iface_traffic_class.attr,
 670         &dev_attr_ipv6_iface_hop_limit.attr,
 671         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 672         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 673         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 674         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 675         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 676         NULL,
 677 };
 678
 679 static struct attribute_group iscsi_iface_group = {
 680         .attrs = iscsi_iface_attrs,
 681         .is_visible = iscsi_iface_attr_is_visible,
 682 };
 683
 684 /* convert iscsi_ipaddress_state values to ascii string name */
 685 static const struct {
 686         enum iscsi_ipaddress_state      value;
 687         char                            *name;
 688 } iscsi_ipaddress_state_names[] = {
 689         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 690         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 691         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 692         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 693         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 694         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 695         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 696 };
 697
 698 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 699 {
 700         int i;
 701         char *state = NULL;
 702
 703         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 704                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 705                         state = iscsi_ipaddress_state_names[i].name;
 706                         break;
 707                 }
 708         }
 709         return state;
 710 }
 711 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 712
 713 /* convert iscsi_router_state values to ascii string name */
 714 static const struct {
 715         enum iscsi_router_state value;
 716         char                    *name;
 717 } iscsi_router_state_names[] = {
 718         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 719         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 720         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 721         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 722 };
 723
 724 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 725 {
 726         int i;
 727         char *state = NULL;
 728
 729         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 730                 if (iscsi_router_state_names[i].value == router_state) {
 731                         state = iscsi_router_state_names[i].name;
 732                         break;
 733                 }
 734         }
 735         return state;
 736 }
 737 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 738
 739 struct iscsi_iface *
 740 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 741                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 742 {
 743         struct iscsi_iface *iface;
 744         int err;
 745
 746         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 747         if (!iface)
 748                 return NULL;
 749
 750         iface->transport = transport;
 751         iface->iface_type = iface_type;
 752         iface->iface_num = iface_num;
 753         iface->dev.release = iscsi_iface_release;
 754         iface->dev.class = &iscsi_iface_class;
 755         /* parent reference released in iscsi_iface_release */
 756         iface->dev.parent = get_device(&shost->shost_gendev);
 757         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 758                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 759                              iface_num);
 760         else
 761                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 762                              iface_num);
 763
 764         err = device_register(&iface->dev);
 765         if (err)
 766                 goto free_iface;
 767
 768         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 769         if (err)
 770                 goto unreg_iface;
 771
 772         if (dd_size)
 773                 iface->dd_data = &iface[1];
 774         return iface;
 775
 776 unreg_iface:
 777         device_unregister(&iface->dev);
 778         return NULL;
 779
 780 free_iface:
 781         put_device(iface->dev.parent);
 782         kfree(iface);
 783         return NULL;
 784 }
 785 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 786
 787 void iscsi_destroy_iface(struct iscsi_iface *iface)
 788 {
 789         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 790         device_unregister(&iface->dev);
 791 }
 792 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 793
 794 /*
 795  * Interface to display flash node params to sysfs
 796  */
 797
 798 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 799 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 800         __ATTR(_name, _mode, _show, _store)
 801
 802 /* flash node session attrs show */
 803 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 804 static ssize_t                                                          \
 805 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 806                      char *buf)                                         \
 807 {                                                                       \
 808         struct iscsi_bus_flash_session *fnode_sess =                    \
 809                                         iscsi_dev_to_flash_session(dev);\
 810         struct iscsi_transport *t = fnode_sess->transport;              \
 811         return t->get_flashnode_param(fnode_sess, param, buf);          \
 812 }                                                                       \
 813
 814
 815 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 816         iscsi_flashnode_sess_attr_show(type, name, param)               \
 817 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 818                             show_##type##_##name, NULL);
 819
 820 /* Flash node session attributes */
 821
 822 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 823                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 824 iscsi_flashnode_sess_attr(fnode, discovery_session,
 825                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 826 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 827 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 828 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 829 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 830 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 831                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 832 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 833                           ISCSI_FLASHNODE_PDU_INORDER);
 834 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 835 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 836                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 837 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 838 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 839                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 840 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 841 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 842 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 843 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 844                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 845 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 846 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 847 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 848 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 849 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 850                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 851 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 852 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 853 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 854 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 855                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 856 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 857                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 858 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 859 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 861 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 862 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 863 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 864 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 865
 866 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 867         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 868         &dev_attr_fnode_discovery_session.attr,
 869         &dev_attr_fnode_portal_type.attr,
 870         &dev_attr_fnode_entry_enable.attr,
 871         &dev_attr_fnode_immediate_data.attr,
 872         &dev_attr_fnode_initial_r2t.attr,
 873         &dev_attr_fnode_data_seq_in_order.attr,
 874         &dev_attr_fnode_data_pdu_in_order.attr,
 875         &dev_attr_fnode_chap_auth.attr,
 876         &dev_attr_fnode_discovery_logout.attr,
 877         &dev_attr_fnode_bidi_chap.attr,
 878         &dev_attr_fnode_discovery_auth_optional.attr,
 879         &dev_attr_fnode_erl.attr,
 880         &dev_attr_fnode_first_burst_len.attr,
 881         &dev_attr_fnode_def_time2wait.attr,
 882         &dev_attr_fnode_def_time2retain.attr,
 883         &dev_attr_fnode_max_outstanding_r2t.attr,
 884         &dev_attr_fnode_isid.attr,
 885         &dev_attr_fnode_tsid.attr,
 886         &dev_attr_fnode_max_burst_len.attr,
 887         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 888         &dev_attr_fnode_targetalias.attr,
 889         &dev_attr_fnode_targetname.attr,
 890         &dev_attr_fnode_tpgt.attr,
 891         &dev_attr_fnode_discovery_parent_idx.attr,
 892         &dev_attr_fnode_discovery_parent_type.attr,
 893         &dev_attr_fnode_chap_in_idx.attr,
 894         &dev_attr_fnode_chap_out_idx.attr,
 895         &dev_attr_fnode_username.attr,
 896         &dev_attr_fnode_username_in.attr,
 897         &dev_attr_fnode_password.attr,
 898         &dev_attr_fnode_password_in.attr,
 899         &dev_attr_fnode_is_boot_target.attr,
 900         NULL,
 901 };
 902
 903 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 904                                                     struct attribute *attr,
 905                                                     int i)
 906 {
 907         struct device *dev = container_of(kobj, struct device, kobj);
 908         struct iscsi_bus_flash_session *fnode_sess =
 909                                                 iscsi_dev_to_flash_session(dev);
 910         struct iscsi_transport *t = fnode_sess->transport;
 911         int param;
 912
 913         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 914                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 915         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 916                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 917         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 918                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 919         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 920                 param = ISCSI_FLASHNODE_ENTRY_EN;
 921         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 922                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 923         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 924                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 925         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 926                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 927         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 928                 param = ISCSI_FLASHNODE_PDU_INORDER;
 929         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 930                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 931         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 932                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 933         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 934                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 937         } else if (attr == &dev_attr_fnode_erl.attr) {
 938                 param = ISCSI_FLASHNODE_ERL;
 939         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 940                 param = ISCSI_FLASHNODE_FIRST_BURST;
 941         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 942                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 943         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 944                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 945         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 946                 param = ISCSI_FLASHNODE_MAX_R2T;
 947         } else if (attr == &dev_attr_fnode_isid.attr) {
 948                 param = ISCSI_FLASHNODE_ISID;
 949         } else if (attr == &dev_attr_fnode_tsid.attr) {
 950                 param = ISCSI_FLASHNODE_TSID;
 951         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 952                 param = ISCSI_FLASHNODE_MAX_BURST;
 953         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 954                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 955         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 956                 param = ISCSI_FLASHNODE_ALIAS;
 957         } else if (attr == &dev_attr_fnode_targetname.attr) {
 958                 param = ISCSI_FLASHNODE_NAME;
 959         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 960                 param = ISCSI_FLASHNODE_TPGT;
 961         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 962                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 963         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 964                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 965         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 966                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 967         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 968                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 969         } else if (attr == &dev_attr_fnode_username.attr) {
 970                 param = ISCSI_FLASHNODE_USERNAME;
 971         } else if (attr == &dev_attr_fnode_username_in.attr) {
 972                 param = ISCSI_FLASHNODE_USERNAME_IN;
 973         } else if (attr == &dev_attr_fnode_password.attr) {
 974                 param = ISCSI_FLASHNODE_PASSWORD;
 975         } else if (attr == &dev_attr_fnode_password_in.attr) {
 976                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 977         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 978                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 979         } else {
 980                 WARN_ONCE(1, "Invalid flashnode session attr");
 981                 return 0;
 982         }
 983
 984         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 985 }
 986
 987 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 988         .attrs = iscsi_flashnode_sess_attrs,
 989         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 990 };
 991
 992 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 993         &iscsi_flashnode_sess_attr_group,
 994         NULL,
 995 };
 996
 997 static void iscsi_flashnode_sess_release(struct device *dev)
 998 {
 999         struct iscsi_bus_flash_session *fnode_sess =
1000                                                 iscsi_dev_to_flash_session(dev);
1001
1002         kfree(fnode_sess->targetname);
1003         kfree(fnode_sess->targetalias);
1004         kfree(fnode_sess->portal_type);
1005         kfree(fnode_sess);
1006 }
1007
1008 static const struct device_type iscsi_flashnode_sess_dev_type = {
1009         .name = "iscsi_flashnode_sess_dev_type",
1010         .groups = iscsi_flashnode_sess_attr_groups,
1011         .release = iscsi_flashnode_sess_release,
1012 };
1013
1014 /* flash node connection attrs show */
1015 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1016 static ssize_t                                                          \
1017 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1018                      char *buf)                                         \
1019 {                                                                       \
1020         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1021         struct iscsi_bus_flash_session *fnode_sess =                    \
1022                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1023         struct iscsi_transport *t = fnode_conn->transport;              \
1024         return t->get_flashnode_param(fnode_sess, param, buf);          \
1025 }                                                                       \
1026
1027
1028 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1029         iscsi_flashnode_conn_attr_show(type, name, param)               \
1030 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1031                             show_##type##_##name, NULL);
1032
1033 /* Flash node connection attributes */
1034
1035 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1036                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1037 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1038 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1039 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1040 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1041                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1042 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1043                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1044 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1045                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1046 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1047                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1049                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1050 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1051                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1052 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1053 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1054 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1055 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1056                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1057 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1058                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1059 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1060 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1061 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1062 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1063                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1064 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1065                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1067                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1068 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1069                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1070 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1071 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1072 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1073 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1074
1075 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1076         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1077         &dev_attr_fnode_header_digest.attr,
1078         &dev_attr_fnode_data_digest.attr,
1079         &dev_attr_fnode_snack_req.attr,
1080         &dev_attr_fnode_tcp_timestamp_stat.attr,
1081         &dev_attr_fnode_tcp_nagle_disable.attr,
1082         &dev_attr_fnode_tcp_wsf_disable.attr,
1083         &dev_attr_fnode_tcp_timer_scale.attr,
1084         &dev_attr_fnode_tcp_timestamp_enable.attr,
1085         &dev_attr_fnode_fragment_disable.attr,
1086         &dev_attr_fnode_max_recv_dlength.attr,
1087         &dev_attr_fnode_max_xmit_dlength.attr,
1088         &dev_attr_fnode_keepalive_tmo.attr,
1089         &dev_attr_fnode_port.attr,
1090         &dev_attr_fnode_ipaddress.attr,
1091         &dev_attr_fnode_redirect_ipaddr.attr,
1092         &dev_attr_fnode_max_segment_size.attr,
1093         &dev_attr_fnode_local_port.attr,
1094         &dev_attr_fnode_ipv4_tos.attr,
1095         &dev_attr_fnode_ipv6_traffic_class.attr,
1096         &dev_attr_fnode_ipv6_flow_label.attr,
1097         &dev_attr_fnode_link_local_ipv6.attr,
1098         &dev_attr_fnode_tcp_xmit_wsf.attr,
1099         &dev_attr_fnode_tcp_recv_wsf.attr,
1100         &dev_attr_fnode_statsn.attr,
1101         &dev_attr_fnode_exp_statsn.attr,
1102         NULL,
1103 };
1104
1105 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1106                                                     struct attribute *attr,
1107                                                     int i)
1108 {
1109         struct device *dev = container_of(kobj, struct device, kobj);
1110         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1111         struct iscsi_transport *t = fnode_conn->transport;
1112         int param;
1113
1114         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1115                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1116         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1117                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1118         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1119                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1120         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1121                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1122         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1123                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1124         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1125                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1126         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1128         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1130         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1132         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1133                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1134         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1135                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1136         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1137                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1138         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1139                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1140         } else if (attr == &dev_attr_fnode_port.attr) {
1141                 param = ISCSI_FLASHNODE_PORT;
1142         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1143                 param = ISCSI_FLASHNODE_IPADDR;
1144         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1145                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1146         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1147                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1148         } else if (attr == &dev_attr_fnode_local_port.attr) {
1149                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1150         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1151                 param = ISCSI_FLASHNODE_IPV4_TOS;
1152         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1153                 param = ISCSI_FLASHNODE_IPV6_TC;
1154         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1155                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1156         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1157                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1158         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1159                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1160         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1161                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1162         } else if (attr == &dev_attr_fnode_statsn.attr) {
1163                 param = ISCSI_FLASHNODE_STATSN;
1164         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1165                 param = ISCSI_FLASHNODE_EXP_STATSN;
1166         } else {
1167                 WARN_ONCE(1, "Invalid flashnode connection attr");
1168                 return 0;
1169         }
1170
1171         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1172 }
1173
1174 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1175         .attrs = iscsi_flashnode_conn_attrs,
1176         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1177 };
1178
1179 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1180         &iscsi_flashnode_conn_attr_group,
1181         NULL,
1182 };
1183
1184 static void iscsi_flashnode_conn_release(struct device *dev)
1185 {
1186         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1187
1188         kfree(fnode_conn->ipaddress);
1189         kfree(fnode_conn->redirect_ipaddr);
1190         kfree(fnode_conn->link_local_ipv6_addr);
1191         kfree(fnode_conn);
1192 }
1193
1194 static const struct device_type iscsi_flashnode_conn_dev_type = {
1195         .name = "iscsi_flashnode_conn_dev_type",
1196         .groups = iscsi_flashnode_conn_attr_groups,
1197         .release = iscsi_flashnode_conn_release,
1198 };
1199
1200 static struct bus_type iscsi_flashnode_bus;
1201
1202 int iscsi_flashnode_bus_match(struct device *dev,
1203                                      struct device_driver *drv)
1204 {
1205         if (dev->bus == &iscsi_flashnode_bus)
1206                 return 1;
1207         return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1210
1211 static struct bus_type iscsi_flashnode_bus = {
1212         .name = "iscsi_flashnode",
1213         .match = &iscsi_flashnode_bus_match,
1214 };
1215
1216 /**
1217  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1218  * @shost: pointer to host data
1219  * @index: index of flashnode to add in sysfs
1220  * @transport: pointer to transport data
1221  * @dd_size: total size to allocate
1222  *
1223  * Adds a sysfs entry for the flashnode session attributes
1224  *
1225  * Returns:
1226  *  pointer to allocated flashnode sess on success
1227  *  %NULL on failure
1228  */
1229 struct iscsi_bus_flash_session *
1230 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1231                             struct iscsi_transport *transport,
1232                             int dd_size)
1233 {
1234         struct iscsi_bus_flash_session *fnode_sess;
1235         int err;
1236
1237         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1238         if (!fnode_sess)
1239                 return NULL;
1240
1241         fnode_sess->transport = transport;
1242         fnode_sess->target_id = index;
1243         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1244         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1245         fnode_sess->dev.parent = &shost->shost_gendev;
1246         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1247                      shost->host_no, index);
1248
1249         err = device_register(&fnode_sess->dev);
1250         if (err)
1251                 goto free_fnode_sess;
1252
1253         if (dd_size)
1254                 fnode_sess->dd_data = &fnode_sess[1];
1255
1256         return fnode_sess;
1257
1258 free_fnode_sess:
1259         kfree(fnode_sess);
1260         return NULL;
1261 }
1262 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1263
1264 /**
1265  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1266  * @shost: pointer to host data
1267  * @fnode_sess: pointer to the parent flashnode session entry
1268  * @transport: pointer to transport data
1269  * @dd_size: total size to allocate
1270  *
1271  * Adds a sysfs entry for the flashnode connection attributes
1272  *
1273  * Returns:
1274  *  pointer to allocated flashnode conn on success
1275  *  %NULL on failure
1276  */
1277 struct iscsi_bus_flash_conn *
1278 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1279                             struct iscsi_bus_flash_session *fnode_sess,
1280                             struct iscsi_transport *transport,
1281                             int dd_size)
1282 {
1283         struct iscsi_bus_flash_conn *fnode_conn;
1284         int err;
1285
1286         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1287         if (!fnode_conn)
1288                 return NULL;
1289
1290         fnode_conn->transport = transport;
1291         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1292         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1293         fnode_conn->dev.parent = &fnode_sess->dev;
1294         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1295                      shost->host_no, fnode_sess->target_id);
1296
1297         err = device_register(&fnode_conn->dev);
1298         if (err)
1299                 goto free_fnode_conn;
1300
1301         if (dd_size)
1302                 fnode_conn->dd_data = &fnode_conn[1];
1303
1304         return fnode_conn;
1305
1306 free_fnode_conn:
1307         kfree(fnode_conn);
1308         return NULL;
1309 }
1310 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1311
1312 /**
1313  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1314  * @dev: device to verify
1315  * @data: pointer to data containing value to use for verification
1316  *
1317  * Verifies if the passed device is flashnode conn device
1318  *
1319  * Returns:
1320  *  1 on success
1321  *  0 on failure
1322  */
1323 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1324 {
1325         return dev->bus == &iscsi_flashnode_bus;
1326 }
1327
1328 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1329 {
1330         device_unregister(&fnode_conn->dev);
1331         return 0;
1332 }
1333
1334 static int flashnode_match_index(struct device *dev, void *data)
1335 {
1336         struct iscsi_bus_flash_session *fnode_sess = NULL;
1337         int ret = 0;
1338
1339         if (!iscsi_flashnode_bus_match(dev, NULL))
1340                 goto exit_match_index;
1341
1342         fnode_sess = iscsi_dev_to_flash_session(dev);
1343         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1344
1345 exit_match_index:
1346         return ret;
1347 }
1348
1349 /**
1350  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1351  * @shost: pointer to host data
1352  * @idx: index to match
1353  *
1354  * Finds the flashnode session object for the passed index
1355  *
1356  * Returns:
1357  *  pointer to found flashnode session object on success
1358  *  %NULL on failure
1359  */
1360 static struct iscsi_bus_flash_session *
1361 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1362 {
1363         struct iscsi_bus_flash_session *fnode_sess = NULL;
1364         struct device *dev;
1365
1366         dev = device_find_child(&shost->shost_gendev, &idx,
1367                                 flashnode_match_index);
1368         if (dev)
1369                 fnode_sess = iscsi_dev_to_flash_session(dev);
1370
1371         return fnode_sess;
1372 }
1373
1374 /**
1375  * iscsi_find_flashnode_sess - finds flashnode session entry
1376  * @shost: pointer to host data
1377  * @data: pointer to data containing value to use for comparison
1378  * @fn: function pointer that does actual comparison
1379  *
1380  * Finds the flashnode session object comparing the data passed using logic
1381  * defined in passed function pointer
1382  *
1383  * Returns:
1384  *  pointer to found flashnode session device object on success
1385  *  %NULL on failure
1386  */
1387 struct device *
1388 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1389                           int (*fn)(struct device *dev, void *data))
1390 {
1391         return device_find_child(&shost->shost_gendev, data, fn);
1392 }
1393 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1394
1395 /**
1396  * iscsi_find_flashnode_conn - finds flashnode connection entry
1397  * @fnode_sess: pointer to parent flashnode session entry
1398  *
1399  * Finds the flashnode connection object comparing the data passed using logic
1400  * defined in passed function pointer
1401  *
1402  * Returns:
1403  *  pointer to found flashnode connection device object on success
1404  *  %NULL on failure
1405  */
1406 struct device *
1407 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1408 {
1409         return device_find_child(&fnode_sess->dev, NULL,
1410                                  iscsi_is_flashnode_conn_dev);
1411 }
1412 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1413
1414 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1415 {
1416         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1417                 return 0;
1418
1419         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1420 }
1421
1422 /**
1423  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1424  * @fnode_sess: pointer to flashnode session entry to be destroyed
1425  *
1426  * Deletes the flashnode session entry and all children flashnode connection
1427  * entries from sysfs
1428  */
1429 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1430 {
1431         int err;
1432
1433         err = device_for_each_child(&fnode_sess->dev, NULL,
1434                                     iscsi_iter_destroy_flashnode_conn_fn);
1435         if (err)
1436                 pr_err("Could not delete all connections for %s. Error %d.\n",
1437                        fnode_sess->dev.kobj.name, err);
1438
1439         device_unregister(&fnode_sess->dev);
1440 }
1441 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1442
1443 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1444 {
1445         if (!iscsi_flashnode_bus_match(dev, NULL))
1446                 return 0;
1447
1448         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1449         return 0;
1450 }
1451
1452 /**
1453  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1454  * @shost: pointer to host data
1455  *
1456  * Destroys all the flashnode session entries and all corresponding children
1457  * flashnode connection entries from sysfs
1458  */
1459 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1460 {
1461         device_for_each_child(&shost->shost_gendev, NULL,
1462                               iscsi_iter_destroy_flashnode_fn);
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1465
1466 /*
1467  * BSG support
1468  */
1469 /**
1470  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1471  * @job: bsg job to be processed
1472  */
1473 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1474 {
1475         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1476         struct iscsi_bsg_request *req = job->request;
1477         struct iscsi_bsg_reply *reply = job->reply;
1478         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1479         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1480         int ret;
1481
1482         /* check if we have the msgcode value at least */
1483         if (job->request_len < sizeof(uint32_t)) {
1484                 ret = -ENOMSG;
1485                 goto fail_host_msg;
1486         }
1487
1488         /* Validate the host command */
1489         switch (req->msgcode) {
1490         case ISCSI_BSG_HST_VENDOR:
1491                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1492                 if ((shost->hostt->vendor_id == 0L) ||
1493                     (req->rqst_data.h_vendor.vendor_id !=
1494                         shost->hostt->vendor_id)) {
1495                         ret = -ESRCH;
1496                         goto fail_host_msg;
1497                 }
1498                 break;
1499         default:
1500                 ret = -EBADR;
1501                 goto fail_host_msg;
1502         }
1503
1504         /* check if we really have all the request data needed */
1505         if (job->request_len < cmdlen) {
1506                 ret = -ENOMSG;
1507                 goto fail_host_msg;
1508         }
1509
1510         ret = i->iscsi_transport->bsg_request(job);
1511         if (!ret)
1512                 return 0;
1513
1514 fail_host_msg:
1515         /* return the errno failure code as the only status */
1516         BUG_ON(job->reply_len < sizeof(uint32_t));
1517         reply->reply_payload_rcv_len = 0;
1518         reply->result = ret;
1519         job->reply_len = sizeof(uint32_t);
1520         bsg_job_done(job, ret, 0);
1521         return 0;
1522 }
1523
1524 /**
1525  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1526  * @shost: shost for iscsi_host
1527  * @ihost: iscsi_cls_host adding the structures to
1528  */
1529 static int
1530 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1531 {
1532         struct device *dev = &shost->shost_gendev;
1533         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1534         struct request_queue *q;
1535         char bsg_name[20];
1536
1537         if (!i->iscsi_transport->bsg_request)
1538                 return -ENOTSUPP;
1539
1540         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1541         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1542         if (IS_ERR(q)) {
1543                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1544                              "initialize - no request queue\n");
1545                 return PTR_ERR(q);
1546         }
1547         __scsi_init_queue(shost, q);
1548
1549         ihost->bsg_q = q;
1550         return 0;
1551 }
1552
1553 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1554                             struct device *cdev)
1555 {
1556         struct Scsi_Host *shost = dev_to_shost(dev);
1557         struct iscsi_cls_host *ihost = shost->shost_data;
1558
1559         memset(ihost, 0, sizeof(*ihost));
1560         atomic_set(&ihost->nr_scans, 0);
1561         mutex_init(&ihost->mutex);
1562
1563         iscsi_bsg_host_add(shost, ihost);
1564         /* ignore any bsg add error - we just can't do sgio */
1565
1566         return 0;
1567 }
1568
1569 static int iscsi_remove_host(struct transport_container *tc,
1570                              struct device *dev, struct device *cdev)
1571 {
1572         struct Scsi_Host *shost = dev_to_shost(dev);
1573         struct iscsi_cls_host *ihost = shost->shost_data;
1574
1575         bsg_remove_queue(ihost->bsg_q);
1576         return 0;
1577 }
1578
1579 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1580                                "iscsi_host",
1581                                iscsi_setup_host,
1582                                iscsi_remove_host,
1583                                NULL);
1584
1585 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1586                                "iscsi_session",
1587                                NULL,
1588                                NULL,
1589                                NULL);
1590
1591 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1592                                "iscsi_connection",
1593                                NULL,
1594                                NULL,
1595                                NULL);
1596
1597 static struct sock *nls;
1598 static DEFINE_MUTEX(rx_queue_mutex);
1599
1600 static LIST_HEAD(sesslist);
1601 static DEFINE_SPINLOCK(sesslock);
1602 static LIST_HEAD(connlist);
1603 static LIST_HEAD(connlist_err);
1604 static DEFINE_SPINLOCK(connlock);
1605
1606 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1607 {
1608         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1609         return sess->sid;
1610 }
1611
1612 /*
1613  * Returns the matching session to a given sid
1614  */
1615 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1616 {
1617         unsigned long flags;
1618         struct iscsi_cls_session *sess;
1619
1620         spin_lock_irqsave(&sesslock, flags);
1621         list_for_each_entry(sess, &sesslist, sess_list) {
1622                 if (sess->sid == sid) {
1623                         spin_unlock_irqrestore(&sesslock, flags);
1624                         return sess;
1625                 }
1626         }
1627         spin_unlock_irqrestore(&sesslock, flags);
1628         return NULL;
1629 }
1630
1631 /*
1632  * Returns the matching connection to a given sid / cid tuple
1633  */
1634 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1635 {
1636         unsigned long flags;
1637         struct iscsi_cls_conn *conn;
1638
1639         spin_lock_irqsave(&connlock, flags);
1640         list_for_each_entry(conn, &connlist, conn_list) {
1641                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1642                         spin_unlock_irqrestore(&connlock, flags);
1643                         return conn;
1644                 }
1645         }
1646         spin_unlock_irqrestore(&connlock, flags);
1647         return NULL;
1648 }
1649
1650 /*
1651  * The following functions can be used by LLDs that allocate
1652  * their own scsi_hosts or by software iscsi LLDs
1653  */
1654 static struct {
1655         int value;
1656         char *name;
1657 } iscsi_session_state_names[] = {
1658         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1659         { ISCSI_SESSION_FAILED,         "FAILED" },
1660         { ISCSI_SESSION_FREE,           "FREE" },
1661 };
1662
1663 static const char *iscsi_session_state_name(int state)
1664 {
1665         int i;
1666         char *name = NULL;
1667
1668         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1669                 if (iscsi_session_state_names[i].value == state) {
1670                         name = iscsi_session_state_names[i].name;
1671                         break;
1672                 }
1673         }
1674         return name;
1675 }
1676
1677 int iscsi_session_chkready(struct iscsi_cls_session *session)
1678 {
1679         unsigned long flags;
1680         int err;
1681
1682         spin_lock_irqsave(&session->lock, flags);
1683         switch (session->state) {
1684         case ISCSI_SESSION_LOGGED_IN:
1685                 err = 0;
1686                 break;
1687         case ISCSI_SESSION_FAILED:
1688                 err = DID_IMM_RETRY << 16;
1689                 break;
1690         case ISCSI_SESSION_FREE:
1691                 err = DID_TRANSPORT_FAILFAST << 16;
1692                 break;
1693         default:
1694                 err = DID_NO_CONNECT << 16;
1695                 break;
1696         }
1697         spin_unlock_irqrestore(&session->lock, flags);
1698         return err;
1699 }
1700 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1701
1702 int iscsi_is_session_online(struct iscsi_cls_session *session)
1703 {
1704         unsigned long flags;
1705         int ret = 0;
1706
1707         spin_lock_irqsave(&session->lock, flags);
1708         if (session->state == ISCSI_SESSION_LOGGED_IN)
1709                 ret = 1;
1710         spin_unlock_irqrestore(&session->lock, flags);
1711         return ret;
1712 }
1713 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1714
1715 static void iscsi_session_release(struct device *dev)
1716 {
1717         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1718         struct Scsi_Host *shost;
1719
1720         shost = iscsi_session_to_shost(session);
1721         scsi_host_put(shost);
1722         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1723         kfree(session);
1724 }
1725
1726 int iscsi_is_session_dev(const struct device *dev)
1727 {
1728         return dev->release == iscsi_session_release;
1729 }
1730 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1731
1732 static int iscsi_iter_session_fn(struct device *dev, void *data)
1733 {
1734         void (* fn) (struct iscsi_cls_session *) = data;
1735
1736         if (!iscsi_is_session_dev(dev))
1737                 return 0;
1738         fn(iscsi_dev_to_session(dev));
1739         return 0;
1740 }
1741
1742 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1743                                  void (*fn)(struct iscsi_cls_session *))
1744 {
1745         device_for_each_child(&shost->shost_gendev, fn,
1746                               iscsi_iter_session_fn);
1747 }
1748 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1749
1750 /**
1751  * iscsi_scan_finished - helper to report when running scans are done
1752  * @shost: scsi host
1753  * @time: scan run time
1754  *
1755  * This function can be used by drives like qla4xxx to report to the scsi
1756  * layer when the scans it kicked off at module load time are done.
1757  */
1758 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1759 {
1760         struct iscsi_cls_host *ihost = shost->shost_data;
1761         /*
1762          * qla4xxx will have kicked off some session unblocks before calling
1763          * scsi_scan_host, so just wait for them to complete.
1764          */
1765         return !atomic_read(&ihost->nr_scans);
1766 }
1767 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1768
1769 struct iscsi_scan_data {
1770         unsigned int channel;
1771         unsigned int id;
1772         u64 lun;
1773         enum scsi_scan_mode rescan;
1774 };
1775
1776 static int iscsi_user_scan_session(struct device *dev, void *data)
1777 {
1778         struct iscsi_scan_data *scan_data = data;
1779         struct iscsi_cls_session *session;
1780         struct Scsi_Host *shost;
1781         struct iscsi_cls_host *ihost;
1782         unsigned long flags;
1783         unsigned int id;
1784
1785         if (!iscsi_is_session_dev(dev))
1786                 return 0;
1787
1788         session = iscsi_dev_to_session(dev);
1789
1790         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1791
1792         shost = iscsi_session_to_shost(session);
1793         ihost = shost->shost_data;
1794
1795         mutex_lock(&ihost->mutex);
1796         spin_lock_irqsave(&session->lock, flags);
1797         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1798                 spin_unlock_irqrestore(&session->lock, flags);
1799                 goto user_scan_exit;
1800         }
1801         id = session->target_id;
1802         spin_unlock_irqrestore(&session->lock, flags);
1803
1804         if (id != ISCSI_MAX_TARGET) {
1805                 if ((scan_data->channel == SCAN_WILD_CARD ||
1806                      scan_data->channel == 0) &&
1807                     (scan_data->id == SCAN_WILD_CARD ||
1808                      scan_data->id == id))
1809                         scsi_scan_target(&session->dev, 0, id,
1810                                          scan_data->lun, scan_data->rescan);
1811         }
1812
1813 user_scan_exit:
1814         mutex_unlock(&ihost->mutex);
1815         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1816         return 0;
1817 }
1818
1819 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1820                            uint id, u64 lun)
1821 {
1822         struct iscsi_scan_data scan_data;
1823
1824         scan_data.channel = channel;
1825         scan_data.id = id;
1826         scan_data.lun = lun;
1827         scan_data.rescan = SCSI_SCAN_MANUAL;
1828
1829         return device_for_each_child(&shost->shost_gendev, &scan_data,
1830                                      iscsi_user_scan_session);
1831 }
1832
1833 static void iscsi_scan_session(struct work_struct *work)
1834 {
1835         struct iscsi_cls_session *session =
1836                         container_of(work, struct iscsi_cls_session, scan_work);
1837         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1838         struct iscsi_cls_host *ihost = shost->shost_data;
1839         struct iscsi_scan_data scan_data;
1840
1841         scan_data.channel = 0;
1842         scan_data.id = SCAN_WILD_CARD;
1843         scan_data.lun = SCAN_WILD_CARD;
1844         scan_data.rescan = SCSI_SCAN_RESCAN;
1845
1846         iscsi_user_scan_session(&session->dev, &scan_data);
1847         atomic_dec(&ihost->nr_scans);
1848 }
1849
1850 /**
1851  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1852  * @cmd: scsi cmd passed to scsi eh handler
1853  *
1854  * If the session is down this function will wait for the recovery
1855  * timer to fire or for the session to be logged back in. If the
1856  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1857  * should pass this error value to the scsi eh.
1858  */
1859 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1860 {
1861         struct iscsi_cls_session *session =
1862                         starget_to_session(scsi_target(cmd->device));
1863         unsigned long flags;
1864         int ret = 0;
1865
1866         spin_lock_irqsave(&session->lock, flags);
1867         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1868                 if (session->state == ISCSI_SESSION_FREE) {
1869                         ret = FAST_IO_FAIL;
1870                         break;
1871                 }
1872                 spin_unlock_irqrestore(&session->lock, flags);
1873                 msleep(1000);
1874                 spin_lock_irqsave(&session->lock, flags);
1875         }
1876         spin_unlock_irqrestore(&session->lock, flags);
1877         return ret;
1878 }
1879 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1880
1881 static void session_recovery_timedout(struct work_struct *work)
1882 {
1883         struct iscsi_cls_session *session =
1884                 container_of(work, struct iscsi_cls_session,
1885                              recovery_work.work);
1886         unsigned long flags;
1887
1888         iscsi_cls_session_printk(KERN_INFO, session,
1889                                  "session recovery timed out after %d secs\n",
1890                                  session->recovery_tmo);
1891
1892         spin_lock_irqsave(&session->lock, flags);
1893         switch (session->state) {
1894         case ISCSI_SESSION_FAILED:
1895                 session->state = ISCSI_SESSION_FREE;
1896                 break;
1897         case ISCSI_SESSION_LOGGED_IN:
1898         case ISCSI_SESSION_FREE:
1899                 /* we raced with the unblock's flush */
1900                 spin_unlock_irqrestore(&session->lock, flags);
1901                 return;
1902         }
1903         spin_unlock_irqrestore(&session->lock, flags);
1904
1905         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1906         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1907         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1908
1909         if (session->transport->session_recovery_timedout)
1910                 session->transport->session_recovery_timedout(session);
1911 }
1912
1913 static void __iscsi_unblock_session(struct work_struct *work)
1914 {
1915         struct iscsi_cls_session *session =
1916                         container_of(work, struct iscsi_cls_session,
1917                                      unblock_work);
1918         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1919         struct iscsi_cls_host *ihost = shost->shost_data;
1920         unsigned long flags;
1921
1922         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1923         /*
1924          * The recovery and unblock work get run from the same workqueue,
1925          * so try to cancel it if it was going to run after this unblock.
1926          */
1927         cancel_delayed_work(&session->recovery_work);
1928         spin_lock_irqsave(&session->lock, flags);
1929         session->state = ISCSI_SESSION_LOGGED_IN;
1930         spin_unlock_irqrestore(&session->lock, flags);
1931         /* start IO */
1932         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1933         /*
1934          * Only do kernel scanning if the driver is properly hooked into
1935          * the async scanning code (drivers like iscsi_tcp do login and
1936          * scanning from userspace).
1937          */
1938         if (shost->hostt->scan_finished) {
1939                 if (scsi_queue_work(shost, &session->scan_work))
1940                         atomic_inc(&ihost->nr_scans);
1941         }
1942         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1943 }
1944
1945 /**
1946  * iscsi_unblock_session - set a session as logged in and start IO.
1947  * @session: iscsi session
1948  *
1949  * Mark a session as ready to accept IO.
1950  */
1951 void iscsi_unblock_session(struct iscsi_cls_session *session)
1952 {
1953         flush_work(&session->block_work);
1954
1955         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1956         /*
1957          * Blocking the session can be done from any context so we only
1958          * queue the block work. Make sure the unblock work has completed
1959          * because it flushes/cancels the other works and updates the state.
1960          */
1961         flush_work(&session->unblock_work);
1962 }
1963 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1964
1965 static void __iscsi_block_session(struct work_struct *work)
1966 {
1967         struct iscsi_cls_session *session =
1968                         container_of(work, struct iscsi_cls_session,
1969                                      block_work);
1970         unsigned long flags;
1971
1972         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1973         spin_lock_irqsave(&session->lock, flags);
1974         session->state = ISCSI_SESSION_FAILED;
1975         spin_unlock_irqrestore(&session->lock, flags);
1976         scsi_target_block(&session->dev);
1977         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1978         if (session->recovery_tmo >= 0)
1979                 queue_delayed_work(iscsi_eh_timer_workq,
1980                                    &session->recovery_work,
1981                                    session->recovery_tmo * HZ);
1982 }
1983
1984 void iscsi_block_session(struct iscsi_cls_session *session)
1985 {
1986         queue_work(iscsi_eh_timer_workq, &session->block_work);
1987 }
1988 EXPORT_SYMBOL_GPL(iscsi_block_session);
1989
1990 static void __iscsi_unbind_session(struct work_struct *work)
1991 {
1992         struct iscsi_cls_session *session =
1993                         container_of(work, struct iscsi_cls_session,
1994                                      unbind_work);
1995         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1996         struct iscsi_cls_host *ihost = shost->shost_data;
1997         unsigned long flags;
1998         unsigned int target_id;
1999
2000         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2001
2002         /* Prevent new scans and make sure scanning is not in progress */
2003         mutex_lock(&ihost->mutex);
2004         spin_lock_irqsave(&session->lock, flags);
2005         if (session->target_id == ISCSI_MAX_TARGET) {
2006                 spin_unlock_irqrestore(&session->lock, flags);
2007                 mutex_unlock(&ihost->mutex);
2008                 goto unbind_session_exit;
2009         }
2010
2011         target_id = session->target_id;
2012         session->target_id = ISCSI_MAX_TARGET;
2013         spin_unlock_irqrestore(&session->lock, flags);
2014         mutex_unlock(&ihost->mutex);
2015
2016         scsi_remove_target(&session->dev);
2017
2018         if (session->ida_used)
2019                 ida_simple_remove(&iscsi_sess_ida, target_id);
2020
2021 unbind_session_exit:
2022         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2023         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2024 }
2025
2026 static void __iscsi_destroy_session(struct work_struct *work)
2027 {
2028         struct iscsi_cls_session *session =
2029                 container_of(work, struct iscsi_cls_session, destroy_work);
2030
2031         session->transport->destroy_session(session);
2032 }
2033
2034 struct iscsi_cls_session *
2035 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2036                     int dd_size)
2037 {
2038         struct iscsi_cls_session *session;
2039
2040         session = kzalloc(sizeof(*session) + dd_size,
2041                           GFP_KERNEL);
2042         if (!session)
2043                 return NULL;
2044
2045         session->transport = transport;
2046         session->creator = -1;
2047         session->recovery_tmo = 120;
2048         session->recovery_tmo_sysfs_override = false;
2049         session->state = ISCSI_SESSION_FREE;
2050         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2051         INIT_LIST_HEAD(&session->sess_list);
2052         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2053         INIT_WORK(&session->block_work, __iscsi_block_session);
2054         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2055         INIT_WORK(&session->scan_work, iscsi_scan_session);
2056         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2057         spin_lock_init(&session->lock);
2058
2059         /* this is released in the dev's release function */
2060         scsi_host_get(shost);
2061         session->dev.parent = &shost->shost_gendev;
2062         session->dev.release = iscsi_session_release;
2063         device_initialize(&session->dev);
2064         if (dd_size)
2065                 session->dd_data = &session[1];
2066
2067         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2068         return session;
2069 }
2070 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2071
2072 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2073 {
2074         unsigned long flags;
2075         int id = 0;
2076         int err;
2077
2078         session->sid = atomic_add_return(1, &iscsi_session_nr);
2079
2080         if (target_id == ISCSI_MAX_TARGET) {
2081                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2082
2083                 if (id < 0) {
2084                         iscsi_cls_session_printk(KERN_ERR, session,
2085                                         "Failure in Target ID Allocation\n");
2086                         return id;
2087                 }
2088                 session->target_id = (unsigned int)id;
2089                 session->ida_used = true;
2090         } else
2091                 session->target_id = target_id;
2092
2093         dev_set_name(&session->dev, "session%u", session->sid);
2094         err = device_add(&session->dev);
2095         if (err) {
2096                 iscsi_cls_session_printk(KERN_ERR, session,
2097                                          "could not register session's dev\n");
2098                 goto release_ida;
2099         }
2100         err = transport_register_device(&session->dev);
2101         if (err) {
2102                 iscsi_cls_session_printk(KERN_ERR, session,
2103                                          "could not register transport's dev\n");
2104                 goto release_dev;
2105         }
2106
2107         spin_lock_irqsave(&sesslock, flags);
2108         list_add(&session->sess_list, &sesslist);
2109         spin_unlock_irqrestore(&sesslock, flags);
2110
2111         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2112         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2113         return 0;
2114
2115 release_dev:
2116         device_del(&session->dev);
2117 release_ida:
2118         if (session->ida_used)
2119                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2120
2121         return err;
2122 }
2123 EXPORT_SYMBOL_GPL(iscsi_add_session);
2124
2125 /**
2126  * iscsi_create_session - create iscsi class session
2127  * @shost: scsi host
2128  * @transport: iscsi transport
2129  * @dd_size: private driver data size
2130  * @target_id: which target
2131  *
2132  * This can be called from a LLD or iscsi_transport.
2133  */
2134 struct iscsi_cls_session *
2135 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2136                      int dd_size, unsigned int target_id)
2137 {
2138         struct iscsi_cls_session *session;
2139
2140         session = iscsi_alloc_session(shost, transport, dd_size);
2141         if (!session)
2142                 return NULL;
2143
2144         if (iscsi_add_session(session, target_id)) {
2145                 iscsi_free_session(session);
2146                 return NULL;
2147         }
2148         return session;
2149 }
2150 EXPORT_SYMBOL_GPL(iscsi_create_session);
2151
2152 static void iscsi_conn_release(struct device *dev)
2153 {
2154         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2155         struct device *parent = conn->dev.parent;
2156
2157         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2158         kfree(conn);
2159         put_device(parent);
2160 }
2161
2162 static int iscsi_is_conn_dev(const struct device *dev)
2163 {
2164         return dev->release == iscsi_conn_release;
2165 }
2166
2167 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2168 {
2169         if (!iscsi_is_conn_dev(dev))
2170                 return 0;
2171         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2172 }
2173
2174 void iscsi_remove_session(struct iscsi_cls_session *session)
2175 {
2176         unsigned long flags;
2177         int err;
2178
2179         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2180
2181         spin_lock_irqsave(&sesslock, flags);
2182         if (!list_empty(&session->sess_list))
2183                 list_del(&session->sess_list);
2184         spin_unlock_irqrestore(&sesslock, flags);
2185
2186         flush_work(&session->block_work);
2187         flush_work(&session->unblock_work);
2188         cancel_delayed_work_sync(&session->recovery_work);
2189         /*
2190          * If we are blocked let commands flow again. The lld or iscsi
2191          * layer should set up the queuecommand to fail commands.
2192          * We assume that LLD will not be calling block/unblock while
2193          * removing the session.
2194          */
2195         spin_lock_irqsave(&session->lock, flags);
2196         session->state = ISCSI_SESSION_FREE;
2197         spin_unlock_irqrestore(&session->lock, flags);
2198
2199         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2200         /* flush running scans then delete devices */
2201         flush_work(&session->scan_work);
2202         /* flush running unbind operations */
2203         flush_work(&session->unbind_work);
2204         __iscsi_unbind_session(&session->unbind_work);
2205
2206         /* hw iscsi may not have removed all connections from session */
2207         err = device_for_each_child(&session->dev, NULL,
2208                                     iscsi_iter_destroy_conn_fn);
2209         if (err)
2210                 iscsi_cls_session_printk(KERN_ERR, session,
2211                                          "Could not delete all connections "
2212                                          "for session. Error %d.\n", err);
2213
2214         transport_unregister_device(&session->dev);
2215
2216         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2217         device_del(&session->dev);
2218 }
2219 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2220
2221 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2222 {
2223         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2224
2225         switch (flag) {
2226         case STOP_CONN_RECOVER:
2227                 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2228                 break;
2229         case STOP_CONN_TERM:
2230                 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2231                 break;
2232         default:
2233                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2234                                       flag);
2235                 return;
2236         }
2237
2238         conn->transport->stop_conn(conn, flag);
2239         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2240 }
2241
2242 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2243 {
2244         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2245         struct iscsi_endpoint *ep;
2246
2247         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2248         WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2249
2250         if (!conn->ep || !session->transport->ep_disconnect)
2251                 return;
2252
2253         ep = conn->ep;
2254         conn->ep = NULL;
2255
2256         session->transport->unbind_conn(conn, is_active);
2257         session->transport->ep_disconnect(ep);
2258         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2259 }
2260
2261 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2262                                          struct iscsi_endpoint *ep,
2263                                          bool is_active)
2264 {
2265         /* Check if this was a conn error and the kernel took ownership */
2266         spin_lock_irq(&conn->lock);
2267         if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2268                 spin_unlock_irq(&conn->lock);
2269                 iscsi_ep_disconnect(conn, is_active);
2270         } else {
2271                 spin_unlock_irq(&conn->lock);
2272                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2273                 mutex_unlock(&conn->ep_mutex);
2274
2275                 flush_work(&conn->cleanup_work);
2276                 /*
2277                  * Userspace is now done with the EP so we can release the ref
2278                  * iscsi_cleanup_conn_work_fn took.
2279                  */
2280                 iscsi_put_endpoint(ep);
2281                 mutex_lock(&conn->ep_mutex);
2282         }
2283 }
2284
2285 static int iscsi_if_stop_conn(struct iscsi_transport *transport,
2286                               struct iscsi_uevent *ev)
2287 {
2288         int flag = ev->u.stop_conn.flag;
2289         struct iscsi_cls_conn *conn;
2290
2291         conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2292         if (!conn)
2293                 return -EINVAL;
2294
2295         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2296         /*
2297          * If this is a termination we have to call stop_conn with that flag
2298          * so the correct states get set. If we haven't run the work yet try to
2299          * avoid the extra run.
2300          */
2301         if (flag == STOP_CONN_TERM) {
2302                 cancel_work_sync(&conn->cleanup_work);
2303                 iscsi_stop_conn(conn, flag);
2304         } else {
2305                 /*
2306                  * For offload, when iscsid is restarted it won't know about
2307                  * existing endpoints so it can't do a ep_disconnect. We clean
2308                  * it up here for userspace.
2309                  */
2310                 mutex_lock(&conn->ep_mutex);
2311                 if (conn->ep)
2312                         iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2313                 mutex_unlock(&conn->ep_mutex);
2314
2315                 /*
2316                  * Figure out if it was the kernel or userspace initiating this.
2317                  */
2318                 spin_lock_irq(&conn->lock);
2319                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2320                         spin_unlock_irq(&conn->lock);
2321                         iscsi_stop_conn(conn, flag);
2322                 } else {
2323                         spin_unlock_irq(&conn->lock);
2324                         ISCSI_DBG_TRANS_CONN(conn,
2325                                              "flush kernel conn cleanup.\n");
2326                         flush_work(&conn->cleanup_work);
2327                 }
2328                 /*
2329                  * Only clear for recovery to avoid extra cleanup runs during
2330                  * termination.
2331                  */
2332                 spin_lock_irq(&conn->lock);
2333                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2334                 spin_unlock_irq(&conn->lock);
2335         }
2336         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2337         return 0;
2338 }
2339
2340 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2341 {
2342         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2343                                                    cleanup_work);
2344         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2345
2346         mutex_lock(&conn->ep_mutex);
2347         /*
2348          * Get a ref to the ep, so we don't release its ID until after
2349          * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2350          */
2351         if (conn->ep)
2352                 get_device(&conn->ep->dev);
2353         iscsi_ep_disconnect(conn, false);
2354
2355         if (system_state != SYSTEM_RUNNING) {
2356                 /*
2357                  * If the user has set up for the session to never timeout
2358                  * then hang like they wanted. For all other cases fail right
2359                  * away since userspace is not going to relogin.
2360                  */
2361                 if (session->recovery_tmo > 0)
2362                         session->recovery_tmo = 0;
2363         }
2364
2365         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2366         mutex_unlock(&conn->ep_mutex);
2367         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2368 }
2369
2370 void iscsi_free_session(struct iscsi_cls_session *session)
2371 {
2372         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2373         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2374         put_device(&session->dev);
2375 }
2376 EXPORT_SYMBOL_GPL(iscsi_free_session);
2377
2378 /**
2379  * iscsi_create_conn - create iscsi class connection
2380  * @session: iscsi cls session
2381  * @dd_size: private driver data size
2382  * @cid: connection id
2383  *
2384  * This can be called from a LLD or iscsi_transport. The connection
2385  * is child of the session so cid must be unique for all connections
2386  * on the session.
2387  *
2388  * Since we do not support MCS, cid will normally be zero. In some cases
2389  * for software iscsi we could be trying to preallocate a connection struct
2390  * in which case there could be two connection structs and cid would be
2391  * non-zero.
2392  */
2393 struct iscsi_cls_conn *
2394 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2395 {
2396         struct iscsi_transport *transport = session->transport;
2397         struct iscsi_cls_conn *conn;
2398         unsigned long flags;
2399         int err;
2400
2401         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2402         if (!conn)
2403                 return NULL;
2404         if (dd_size)
2405                 conn->dd_data = &conn[1];
2406
2407         mutex_init(&conn->ep_mutex);
2408         spin_lock_init(&conn->lock);
2409         INIT_LIST_HEAD(&conn->conn_list);
2410         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2411         conn->transport = transport;
2412         conn->cid = cid;
2413         WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2414
2415         /* this is released in the dev's release function */
2416         if (!get_device(&session->dev))
2417                 goto free_conn;
2418
2419         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2420         conn->dev.parent = &session->dev;
2421         conn->dev.release = iscsi_conn_release;
2422         err = device_register(&conn->dev);
2423         if (err) {
2424                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2425                                          "register connection's dev\n");
2426                 goto release_parent_ref;
2427         }
2428         err = transport_register_device(&conn->dev);
2429         if (err) {
2430                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2431                                          "register transport's dev\n");
2432                 goto release_conn_ref;
2433         }
2434
2435         spin_lock_irqsave(&connlock, flags);
2436         list_add(&conn->conn_list, &connlist);
2437         spin_unlock_irqrestore(&connlock, flags);
2438
2439         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2440         return conn;
2441
2442 release_conn_ref:
2443         device_unregister(&conn->dev);
2444         put_device(&session->dev);
2445         return NULL;
2446 release_parent_ref:
2447         put_device(&session->dev);
2448 free_conn:
2449         kfree(conn);
2450         return NULL;
2451 }
2452
2453 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2454
2455 /**
2456  * iscsi_destroy_conn - destroy iscsi class connection
2457  * @conn: iscsi cls session
2458  *
2459  * This can be called from a LLD or iscsi_transport.
2460  */
2461 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2462 {
2463         unsigned long flags;
2464
2465         spin_lock_irqsave(&connlock, flags);
2466         list_del(&conn->conn_list);
2467         spin_unlock_irqrestore(&connlock, flags);
2468
2469         transport_unregister_device(&conn->dev);
2470         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2471         device_unregister(&conn->dev);
2472         return 0;
2473 }
2474 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2475
2476 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2477 {
2478         put_device(&conn->dev);
2479 }
2480 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2481
2482 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2483 {
2484         get_device(&conn->dev);
2485 }
2486 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2487
2488 /*
2489  * iscsi interface functions
2490  */
2491 static struct iscsi_internal *
2492 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2493 {
2494         struct iscsi_internal *priv;
2495         unsigned long flags;
2496
2497         spin_lock_irqsave(&iscsi_transport_lock, flags);
2498         list_for_each_entry(priv, &iscsi_transports, list) {
2499                 if (tt == priv->iscsi_transport) {
2500                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2501                         return priv;
2502                 }
2503         }
2504         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2505         return NULL;
2506 }
2507
2508 static int
2509 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2510 {
2511         return nlmsg_multicast(nls, skb, 0, group, gfp);
2512 }
2513
2514 static int
2515 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2516 {
2517         return nlmsg_unicast(nls, skb, portid);
2518 }
2519
2520 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2521                    char *data, uint32_t data_size)
2522 {
2523         struct nlmsghdr *nlh;
2524         struct sk_buff *skb;
2525         struct iscsi_uevent *ev;
2526         char *pdu;
2527         struct iscsi_internal *priv;
2528         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2529                                    data_size);
2530
2531         priv = iscsi_if_transport_lookup(conn->transport);
2532         if (!priv)
2533                 return -EINVAL;
2534
2535         skb = alloc_skb(len, GFP_ATOMIC);
2536         if (!skb) {
2537                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2538                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2539                                       "control PDU: OOM\n");
2540                 return -ENOMEM;
2541         }
2542
2543         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2544         ev = nlmsg_data(nlh);
2545         memset(ev, 0, sizeof(*ev));
2546         ev->transport_handle = iscsi_handle(conn->transport);
2547         ev->type = ISCSI_KEVENT_RECV_PDU;
2548         ev->r.recv_req.cid = conn->cid;
2549         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2550         pdu = (char*)ev + sizeof(*ev);
2551         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2552         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2553
2554         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2555 }
2556 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2557
2558 int iscsi_offload_mesg(struct Scsi_Host *shost,
2559                        struct iscsi_transport *transport, uint32_t type,
2560                        char *data, uint16_t data_size)
2561 {
2562         struct nlmsghdr *nlh;
2563         struct sk_buff *skb;
2564         struct iscsi_uevent *ev;
2565         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2566
2567         skb = alloc_skb(len, GFP_ATOMIC);
2568         if (!skb) {
2569                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2570                 return -ENOMEM;
2571         }
2572
2573         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2574         ev = nlmsg_data(nlh);
2575         memset(ev, 0, sizeof(*ev));
2576         ev->type = type;
2577         ev->transport_handle = iscsi_handle(transport);
2578         switch (type) {
2579         case ISCSI_KEVENT_PATH_REQ:
2580                 ev->r.req_path.host_no = shost->host_no;
2581                 break;
2582         case ISCSI_KEVENT_IF_DOWN:
2583                 ev->r.notify_if_down.host_no = shost->host_no;
2584                 break;
2585         }
2586
2587         memcpy((char *)ev + sizeof(*ev), data, data_size);
2588
2589         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2590 }
2591 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2592
2593 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2594 {
2595         struct nlmsghdr *nlh;
2596         struct sk_buff  *skb;
2597         struct iscsi_uevent *ev;
2598         struct iscsi_internal *priv;
2599         int len = nlmsg_total_size(sizeof(*ev));
2600         unsigned long flags;
2601         int state;
2602
2603         spin_lock_irqsave(&conn->lock, flags);
2604         /*
2605          * Userspace will only do a stop call if we are at least bound. And, we
2606          * only need to do the in kernel cleanup if in the UP state so cmds can
2607          * be released to upper layers. If in other states just wait for
2608          * userspace to avoid races that can leave the cleanup_work queued.
2609          */
2610         state = READ_ONCE(conn->state);
2611         switch (state) {
2612         case ISCSI_CONN_BOUND:
2613         case ISCSI_CONN_UP:
2614                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2615                                       &conn->flags)) {
2616                         queue_work(iscsi_conn_cleanup_workq,
2617                                    &conn->cleanup_work);
2618                 }
2619                 break;
2620         default:
2621                 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2622                                      state);
2623                 break;
2624         }
2625         spin_unlock_irqrestore(&conn->lock, flags);
2626
2627         priv = iscsi_if_transport_lookup(conn->transport);
2628         if (!priv)
2629                 return;
2630
2631         skb = alloc_skb(len, GFP_ATOMIC);
2632         if (!skb) {
2633                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2634                                       "conn error (%d)\n", error);
2635                 return;
2636         }
2637
2638         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2639         ev = nlmsg_data(nlh);
2640         ev->transport_handle = iscsi_handle(conn->transport);
2641         ev->type = ISCSI_KEVENT_CONN_ERROR;
2642         ev->r.connerror.error = error;
2643         ev->r.connerror.cid = conn->cid;
2644         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2645
2646         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2647
2648         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2649                               error);
2650 }
2651 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2652
2653 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2654                             enum iscsi_conn_state state)
2655 {
2656         struct nlmsghdr *nlh;
2657         struct sk_buff  *skb;
2658         struct iscsi_uevent *ev;
2659         struct iscsi_internal *priv;
2660         int len = nlmsg_total_size(sizeof(*ev));
2661
2662         priv = iscsi_if_transport_lookup(conn->transport);
2663         if (!priv)
2664                 return;
2665
2666         skb = alloc_skb(len, GFP_ATOMIC);
2667         if (!skb) {
2668                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2669                                       "conn login (%d)\n", state);
2670                 return;
2671         }
2672
2673         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2674         ev = nlmsg_data(nlh);
2675         ev->transport_handle = iscsi_handle(conn->transport);
2676         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2677         ev->r.conn_login.state = state;
2678         ev->r.conn_login.cid = conn->cid;
2679         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2680         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2681
2682         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2683                               state);
2684 }
2685 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2686
2687 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2688                            enum iscsi_host_event_code code, uint32_t data_size,
2689                            uint8_t *data)
2690 {
2691         struct nlmsghdr *nlh;
2692         struct sk_buff *skb;
2693         struct iscsi_uevent *ev;
2694         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2695
2696         skb = alloc_skb(len, GFP_NOIO);
2697         if (!skb) {
2698                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2699                        host_no, code);
2700                 return;
2701         }
2702
2703         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2704         ev = nlmsg_data(nlh);
2705         ev->transport_handle = iscsi_handle(transport);
2706         ev->type = ISCSI_KEVENT_HOST_EVENT;
2707         ev->r.host_event.host_no = host_no;
2708         ev->r.host_event.code = code;
2709         ev->r.host_event.data_size = data_size;
2710
2711         if (data_size)
2712                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2713
2714         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2715 }
2716 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2717
2718 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2719                            uint32_t status, uint32_t pid, uint32_t data_size,
2720                            uint8_t *data)
2721 {
2722         struct nlmsghdr *nlh;
2723         struct sk_buff *skb;
2724         struct iscsi_uevent *ev;
2725         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2726
2727         skb = alloc_skb(len, GFP_NOIO);
2728         if (!skb) {
2729                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2730                 return;
2731         }
2732
2733         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2734         ev = nlmsg_data(nlh);
2735         ev->transport_handle = iscsi_handle(transport);
2736         ev->type = ISCSI_KEVENT_PING_COMP;
2737         ev->r.ping_comp.host_no = host_no;
2738         ev->r.ping_comp.status = status;
2739         ev->r.ping_comp.pid = pid;
2740         ev->r.ping_comp.data_size = data_size;
2741         memcpy((char *)ev + sizeof(*ev), data, data_size);
2742
2743         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2744 }
2745 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2746
2747 static int
2748 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2749 {
2750         struct sk_buff  *skb;
2751         struct nlmsghdr *nlh;
2752         int len = nlmsg_total_size(size);
2753
2754         skb = alloc_skb(len, GFP_ATOMIC);
2755         if (!skb) {
2756                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2757                 return -ENOMEM;
2758         }
2759
2760         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2761         memcpy(nlmsg_data(nlh), payload, size);
2762         return iscsi_unicast_skb(skb, portid);
2763 }
2764
2765 static int
2766 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2767 {
2768         struct iscsi_uevent *ev = nlmsg_data(nlh);
2769         struct iscsi_stats *stats;
2770         struct sk_buff *skbstat;
2771         struct iscsi_cls_conn *conn;
2772         struct nlmsghdr *nlhstat;
2773         struct iscsi_uevent *evstat;
2774         struct iscsi_internal *priv;
2775         int len = nlmsg_total_size(sizeof(*ev) +
2776                                    sizeof(struct iscsi_stats) +
2777                                    sizeof(struct iscsi_stats_custom) *
2778                                    ISCSI_STATS_CUSTOM_MAX);
2779         int err = 0;
2780
2781         priv = iscsi_if_transport_lookup(transport);
2782         if (!priv)
2783                 return -EINVAL;
2784
2785         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2786         if (!conn)
2787                 return -EEXIST;
2788
2789         do {
2790                 int actual_size;
2791
2792                 skbstat = alloc_skb(len, GFP_ATOMIC);
2793                 if (!skbstat) {
2794                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2795                                               "deliver stats: OOM\n");
2796                         return -ENOMEM;
2797                 }
2798
2799                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2800                                       (len - sizeof(*nlhstat)), 0);
2801                 evstat = nlmsg_data(nlhstat);
2802                 memset(evstat, 0, sizeof(*evstat));
2803                 evstat->transport_handle = iscsi_handle(conn->transport);
2804                 evstat->type = nlh->nlmsg_type;
2805                 evstat->u.get_stats.cid =
2806                         ev->u.get_stats.cid;
2807                 evstat->u.get_stats.sid =
2808                         ev->u.get_stats.sid;
2809                 stats = (struct iscsi_stats *)
2810                         ((char*)evstat + sizeof(*evstat));
2811                 memset(stats, 0, sizeof(*stats));
2812
2813                 transport->get_stats(conn, stats);
2814                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2815                                                sizeof(struct iscsi_stats) +
2816                                                sizeof(struct iscsi_stats_custom) *
2817                                                stats->custom_length);
2818                 actual_size -= sizeof(*nlhstat);
2819                 actual_size = nlmsg_msg_size(actual_size);
2820                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2821                 nlhstat->nlmsg_len = actual_size;
2822
2823                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2824                                           GFP_ATOMIC);
2825         } while (err < 0 && err != -ECONNREFUSED);
2826
2827         return err;
2828 }
2829
2830 /**
2831  * iscsi_session_event - send session destr. completion event
2832  * @session: iscsi class session
2833  * @event: type of event
2834  */
2835 int iscsi_session_event(struct iscsi_cls_session *session,
2836                         enum iscsi_uevent_e event)
2837 {
2838         struct iscsi_internal *priv;
2839         struct Scsi_Host *shost;
2840         struct iscsi_uevent *ev;
2841         struct sk_buff  *skb;
2842         struct nlmsghdr *nlh;
2843         int rc, len = nlmsg_total_size(sizeof(*ev));
2844
2845         priv = iscsi_if_transport_lookup(session->transport);
2846         if (!priv)
2847                 return -EINVAL;
2848         shost = iscsi_session_to_shost(session);
2849
2850         skb = alloc_skb(len, GFP_KERNEL);
2851         if (!skb) {
2852                 iscsi_cls_session_printk(KERN_ERR, session,
2853                                          "Cannot notify userspace of session "
2854                                          "event %u\n", event);
2855                 return -ENOMEM;
2856         }
2857
2858         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2859         ev = nlmsg_data(nlh);
2860         ev->transport_handle = iscsi_handle(session->transport);
2861
2862         ev->type = event;
2863         switch (event) {
2864         case ISCSI_KEVENT_DESTROY_SESSION:
2865                 ev->r.d_session.host_no = shost->host_no;
2866                 ev->r.d_session.sid = session->sid;
2867                 break;
2868         case ISCSI_KEVENT_CREATE_SESSION:
2869                 ev->r.c_session_ret.host_no = shost->host_no;
2870                 ev->r.c_session_ret.sid = session->sid;
2871                 break;
2872         case ISCSI_KEVENT_UNBIND_SESSION:
2873                 ev->r.unbind_session.host_no = shost->host_no;
2874                 ev->r.unbind_session.sid = session->sid;
2875                 break;
2876         default:
2877                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2878                                          "%u.\n", event);
2879                 kfree_skb(skb);
2880                 return -EINVAL;
2881         }
2882
2883         /*
2884          * this will occur if the daemon is not up, so we just warn
2885          * the user and when the daemon is restarted it will handle it
2886          */
2887         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2888         if (rc == -ESRCH)
2889                 iscsi_cls_session_printk(KERN_ERR, session,
2890                                          "Cannot notify userspace of session "
2891                                          "event %u. Check iscsi daemon\n",
2892                                          event);
2893
2894         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2895                                 event, rc);
2896         return rc;
2897 }
2898 EXPORT_SYMBOL_GPL(iscsi_session_event);
2899
2900 static int
2901 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2902                         struct iscsi_uevent *ev, pid_t pid,
2903                         uint32_t initial_cmdsn, uint16_t cmds_max,
2904                         uint16_t queue_depth)
2905 {
2906         struct iscsi_transport *transport = priv->iscsi_transport;
2907         struct iscsi_cls_session *session;
2908         struct Scsi_Host *shost;
2909
2910         session = transport->create_session(ep, cmds_max, queue_depth,
2911                                             initial_cmdsn);
2912         if (!session)
2913                 return -ENOMEM;
2914
2915         session->creator = pid;
2916         shost = iscsi_session_to_shost(session);
2917         ev->r.c_session_ret.host_no = shost->host_no;
2918         ev->r.c_session_ret.sid = session->sid;
2919         ISCSI_DBG_TRANS_SESSION(session,
2920                                 "Completed creating transport session\n");
2921         return 0;
2922 }
2923
2924 static int
2925 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2926 {
2927         struct iscsi_cls_conn *conn;
2928         struct iscsi_cls_session *session;
2929
2930         session = iscsi_session_lookup(ev->u.c_conn.sid);
2931         if (!session) {
2932                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2933                        ev->u.c_conn.sid);
2934                 return -EINVAL;
2935         }
2936
2937         conn = transport->create_conn(session, ev->u.c_conn.cid);
2938         if (!conn) {
2939                 iscsi_cls_session_printk(KERN_ERR, session,
2940                                          "couldn't create a new connection.");
2941                 return -ENOMEM;
2942         }
2943
2944         ev->r.c_conn_ret.sid = session->sid;
2945         ev->r.c_conn_ret.cid = conn->cid;
2946
2947         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2948         return 0;
2949 }
2950
2951 static int
2952 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2953 {
2954         struct iscsi_cls_conn *conn;
2955
2956         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2957         if (!conn)
2958                 return -EINVAL;
2959
2960         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2961         flush_work(&conn->cleanup_work);
2962         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2963
2964         if (transport->destroy_conn)
2965                 transport->destroy_conn(conn);
2966         return 0;
2967 }
2968
2969 static int
2970 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2971 {
2972         char *data = (char*)ev + sizeof(*ev);
2973         struct iscsi_cls_conn *conn;
2974         struct iscsi_cls_session *session;
2975         int err = 0, value = 0, state;
2976
2977         if (ev->u.set_param.len > PAGE_SIZE)
2978                 return -EINVAL;
2979
2980         session = iscsi_session_lookup(ev->u.set_param.sid);
2981         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2982         if (!conn || !session)
2983                 return -EINVAL;
2984
2985         switch (ev->u.set_param.param) {
2986         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2987                 sscanf(data, "%d", &value);
2988                 if (!session->recovery_tmo_sysfs_override)
2989                         session->recovery_tmo = value;
2990                 break;
2991         default:
2992                 state = READ_ONCE(conn->state);
2993                 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
2994                         err = transport->set_param(conn, ev->u.set_param.param,
2995                                         data, ev->u.set_param.len);
2996                 } else {
2997                         return -ENOTCONN;
2998                 }
2999         }
3000
3001         return err;
3002 }
3003
3004 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3005                                struct iscsi_uevent *ev, int msg_type)
3006 {
3007         struct iscsi_endpoint *ep;
3008         struct sockaddr *dst_addr;
3009         struct Scsi_Host *shost = NULL;
3010         int non_blocking, err = 0;
3011
3012         if (!transport->ep_connect)
3013                 return -EINVAL;
3014
3015         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3016                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3017                 if (!shost) {
3018                         printk(KERN_ERR "ep connect failed. Could not find "
3019                                "host no %u\n",
3020                                ev->u.ep_connect_through_host.host_no);
3021                         return -ENODEV;
3022                 }
3023                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3024         } else
3025                 non_blocking = ev->u.ep_connect.non_blocking;
3026
3027         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3028         ep = transport->ep_connect(shost, dst_addr, non_blocking);
3029         if (IS_ERR(ep)) {
3030                 err = PTR_ERR(ep);
3031                 goto release_host;
3032         }
3033
3034         ev->r.ep_connect_ret.handle = ep->id;
3035 release_host:
3036         if (shost)
3037                 scsi_host_put(shost);
3038         return err;
3039 }
3040
3041 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3042                                   u64 ep_handle)
3043 {
3044         struct iscsi_cls_conn *conn;
3045         struct iscsi_endpoint *ep;
3046
3047         if (!transport->ep_disconnect)
3048                 return -EINVAL;
3049
3050         ep = iscsi_lookup_endpoint(ep_handle);
3051         if (!ep)
3052                 return -EINVAL;
3053
3054         conn = ep->conn;
3055         if (!conn) {
3056                 /*
3057                  * conn was not even bound yet, so we can't get iscsi conn
3058                  * failures yet.
3059                  */
3060                 transport->ep_disconnect(ep);
3061                 goto put_ep;
3062         }
3063
3064         mutex_lock(&conn->ep_mutex);
3065         iscsi_if_disconnect_bound_ep(conn, ep, false);
3066         mutex_unlock(&conn->ep_mutex);
3067 put_ep:
3068         iscsi_put_endpoint(ep);
3069         return 0;
3070 }
3071
3072 static int
3073 iscsi_if_transport_ep(struct iscsi_transport *transport,
3074                       struct iscsi_uevent *ev, int msg_type)
3075 {
3076         struct iscsi_endpoint *ep;
3077         int rc = 0;
3078
3079         switch (msg_type) {
3080         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3081         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3082                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3083                 break;
3084         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3085                 if (!transport->ep_poll)
3086                         return -EINVAL;
3087
3088                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3089                 if (!ep)
3090                         return -EINVAL;
3091
3092                 ev->r.retcode = transport->ep_poll(ep,
3093                                                    ev->u.ep_poll.timeout_ms);
3094                 iscsi_put_endpoint(ep);
3095                 break;
3096         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3097                 rc = iscsi_if_ep_disconnect(transport,
3098                                             ev->u.ep_disconnect.ep_handle);
3099                 break;
3100         }
3101         return rc;
3102 }
3103
3104 static int
3105 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3106                 struct iscsi_uevent *ev)
3107 {
3108         struct Scsi_Host *shost;
3109         struct sockaddr *dst_addr;
3110         int err;
3111
3112         if (!transport->tgt_dscvr)
3113                 return -EINVAL;
3114
3115         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3116         if (!shost) {
3117                 printk(KERN_ERR "target discovery could not find host no %u\n",
3118                        ev->u.tgt_dscvr.host_no);
3119                 return -ENODEV;
3120         }
3121
3122
3123         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3124         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3125                                    ev->u.tgt_dscvr.enable, dst_addr);
3126         scsi_host_put(shost);
3127         return err;
3128 }
3129
3130 static int
3131 iscsi_set_host_param(struct iscsi_transport *transport,
3132                      struct iscsi_uevent *ev)
3133 {
3134         char *data = (char*)ev + sizeof(*ev);
3135         struct Scsi_Host *shost;
3136         int err;
3137
3138         if (!transport->set_host_param)
3139                 return -ENOSYS;
3140
3141         if (ev->u.set_host_param.len > PAGE_SIZE)
3142                 return -EINVAL;
3143
3144         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3145         if (!shost) {
3146                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3147                        ev->u.set_host_param.host_no);
3148                 return -ENODEV;
3149         }
3150
3151         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3152                                         data, ev->u.set_host_param.len);
3153         scsi_host_put(shost);
3154         return err;
3155 }
3156
3157 static int
3158 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3159 {
3160         struct Scsi_Host *shost;
3161         struct iscsi_path *params;
3162         int err;
3163
3164         if (!transport->set_path)
3165                 return -ENOSYS;
3166
3167         shost = scsi_host_lookup(ev->u.set_path.host_no);
3168         if (!shost) {
3169                 printk(KERN_ERR "set path could not find host no %u\n",
3170                        ev->u.set_path.host_no);
3171                 return -ENODEV;
3172         }
3173
3174         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3175         err = transport->set_path(shost, params);
3176
3177         scsi_host_put(shost);
3178         return err;
3179 }
3180
3181 static int iscsi_session_has_conns(int sid)
3182 {
3183         struct iscsi_cls_conn *conn;
3184         unsigned long flags;
3185         int found = 0;
3186
3187         spin_lock_irqsave(&connlock, flags);
3188         list_for_each_entry(conn, &connlist, conn_list) {
3189                 if (iscsi_conn_get_sid(conn) == sid) {
3190                         found = 1;
3191                         break;
3192                 }
3193         }
3194         spin_unlock_irqrestore(&connlock, flags);
3195
3196         return found;
3197 }
3198
3199 static int
3200 iscsi_set_iface_params(struct iscsi_transport *transport,
3201                        struct iscsi_uevent *ev, uint32_t len)
3202 {
3203         char *data = (char *)ev + sizeof(*ev);
3204         struct Scsi_Host *shost;
3205         int err;
3206
3207         if (!transport->set_iface_param)
3208                 return -ENOSYS;
3209
3210         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3211         if (!shost) {
3212                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3213                        ev->u.set_iface_params.host_no);
3214                 return -ENODEV;
3215         }
3216
3217         err = transport->set_iface_param(shost, data, len);
3218         scsi_host_put(shost);
3219         return err;
3220 }
3221
3222 static int
3223 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3224 {
3225         struct Scsi_Host *shost;
3226         struct sockaddr *dst_addr;
3227         int err;
3228
3229         if (!transport->send_ping)
3230                 return -ENOSYS;
3231
3232         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3233         if (!shost) {
3234                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3235                        ev->u.iscsi_ping.host_no);
3236                 return -ENODEV;
3237         }
3238
3239         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3240         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3241                                    ev->u.iscsi_ping.iface_type,
3242                                    ev->u.iscsi_ping.payload_size,
3243                                    ev->u.iscsi_ping.pid,
3244                                    dst_addr);
3245         scsi_host_put(shost);
3246         return err;
3247 }
3248
3249 static int
3250 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3251 {
3252         struct iscsi_uevent *ev = nlmsg_data(nlh);
3253         struct Scsi_Host *shost = NULL;
3254         struct iscsi_chap_rec *chap_rec;
3255         struct iscsi_internal *priv;
3256         struct sk_buff *skbchap;
3257         struct nlmsghdr *nlhchap;
3258         struct iscsi_uevent *evchap;
3259         uint32_t chap_buf_size;
3260         int len, err = 0;
3261         char *buf;
3262
3263         if (!transport->get_chap)
3264                 return -EINVAL;
3265
3266         priv = iscsi_if_transport_lookup(transport);
3267         if (!priv)
3268                 return -EINVAL;
3269
3270         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3271         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3272
3273         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3274         if (!shost) {
3275                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3276                        __func__, ev->u.get_chap.host_no);
3277                 return -ENODEV;
3278         }
3279
3280         do {
3281                 int actual_size;
3282
3283                 skbchap = alloc_skb(len, GFP_KERNEL);
3284                 if (!skbchap) {
3285                         printk(KERN_ERR "can not deliver chap: OOM\n");
3286                         err = -ENOMEM;
3287                         goto exit_get_chap;
3288                 }
3289
3290                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3291                                       (len - sizeof(*nlhchap)), 0);
3292                 evchap = nlmsg_data(nlhchap);
3293                 memset(evchap, 0, sizeof(*evchap));
3294                 evchap->transport_handle = iscsi_handle(transport);
3295                 evchap->type = nlh->nlmsg_type;
3296                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3297                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3298                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3299                 buf = (char *)evchap + sizeof(*evchap);
3300                 memset(buf, 0, chap_buf_size);
3301
3302                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3303                                     &evchap->u.get_chap.num_entries, buf);
3304
3305                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3306                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3307                 nlhchap->nlmsg_len = actual_size;
3308
3309                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3310                                           GFP_KERNEL);
3311         } while (err < 0 && err != -ECONNREFUSED);
3312
3313 exit_get_chap:
3314         scsi_host_put(shost);
3315         return err;
3316 }
3317
3318 static int iscsi_set_chap(struct iscsi_transport *transport,
3319                           struct iscsi_uevent *ev, uint32_t len)
3320 {
3321         char *data = (char *)ev + sizeof(*ev);
3322         struct Scsi_Host *shost;
3323         int err = 0;
3324
3325         if (!transport->set_chap)
3326                 return -ENOSYS;
3327
3328         shost = scsi_host_lookup(ev->u.set_path.host_no);
3329         if (!shost) {
3330                 pr_err("%s could not find host no %u\n",
3331                        __func__, ev->u.set_path.host_no);
3332                 return -ENODEV;
3333         }
3334
3335         err = transport->set_chap(shost, data, len);
3336         scsi_host_put(shost);
3337         return err;
3338 }
3339
3340 static int iscsi_delete_chap(struct iscsi_transport *transport,
3341                              struct iscsi_uevent *ev)
3342 {
3343         struct Scsi_Host *shost;
3344         int err = 0;
3345
3346         if (!transport->delete_chap)
3347                 return -ENOSYS;
3348
3349         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3350         if (!shost) {
3351                 printk(KERN_ERR "%s could not find host no %u\n",
3352                        __func__, ev->u.delete_chap.host_no);
3353                 return -ENODEV;
3354         }
3355
3356         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3357         scsi_host_put(shost);
3358         return err;
3359 }
3360
3361 static const struct {
3362         enum iscsi_discovery_parent_type value;
3363         char                            *name;
3364 } iscsi_discovery_parent_names[] = {
3365         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3366         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3367         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3368 };
3369
3370 char *iscsi_get_discovery_parent_name(int parent_type)
3371 {
3372         int i;
3373         char *state = "Unknown!";
3374
3375         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3376                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3377                         state = iscsi_discovery_parent_names[i].name;
3378                         break;
3379                 }
3380         }
3381         return state;
3382 }
3383 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3384
3385 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3386                                      struct iscsi_uevent *ev, uint32_t len)
3387 {
3388         char *data = (char *)ev + sizeof(*ev);
3389         struct Scsi_Host *shost;
3390         struct iscsi_bus_flash_session *fnode_sess;
3391         struct iscsi_bus_flash_conn *fnode_conn;
3392         struct device *dev;
3393         uint32_t idx;
3394         int err = 0;
3395
3396         if (!transport->set_flashnode_param) {
3397                 err = -ENOSYS;
3398                 goto exit_set_fnode;
3399         }
3400
3401         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3402         if (!shost) {
3403                 pr_err("%s could not find host no %u\n",
3404                        __func__, ev->u.set_flashnode.host_no);
3405                 err = -ENODEV;
3406                 goto exit_set_fnode;
3407         }
3408
3409         idx = ev->u.set_flashnode.flashnode_idx;
3410         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3411         if (!fnode_sess) {
3412                 pr_err("%s could not find flashnode %u for host no %u\n",
3413                        __func__, idx, ev->u.set_flashnode.host_no);
3414                 err = -ENODEV;
3415                 goto put_host;
3416         }
3417
3418         dev = iscsi_find_flashnode_conn(fnode_sess);
3419         if (!dev) {
3420                 err = -ENODEV;
3421                 goto put_sess;
3422         }
3423
3424         fnode_conn = iscsi_dev_to_flash_conn(dev);
3425         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3426         put_device(dev);
3427
3428 put_sess:
3429         put_device(&fnode_sess->dev);
3430
3431 put_host:
3432         scsi_host_put(shost);
3433
3434 exit_set_fnode:
3435         return err;
3436 }
3437
3438 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3439                                struct iscsi_uevent *ev, uint32_t len)
3440 {
3441         char *data = (char *)ev + sizeof(*ev);
3442         struct Scsi_Host *shost;
3443         int index;
3444         int err = 0;
3445
3446         if (!transport->new_flashnode) {
3447                 err = -ENOSYS;
3448                 goto exit_new_fnode;
3449         }
3450
3451         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3452         if (!shost) {
3453                 pr_err("%s could not find host no %u\n",
3454                        __func__, ev->u.new_flashnode.host_no);
3455                 err = -ENODEV;
3456                 goto put_host;
3457         }
3458
3459         index = transport->new_flashnode(shost, data, len);
3460
3461         if (index >= 0)
3462                 ev->r.new_flashnode_ret.flashnode_idx = index;
3463         else
3464                 err = -EIO;
3465
3466 put_host:
3467         scsi_host_put(shost);
3468
3469 exit_new_fnode:
3470         return err;
3471 }
3472
3473 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3474                                struct iscsi_uevent *ev)
3475 {
3476         struct Scsi_Host *shost;
3477         struct iscsi_bus_flash_session *fnode_sess;
3478         uint32_t idx;
3479         int err = 0;
3480
3481         if (!transport->del_flashnode) {
3482                 err = -ENOSYS;
3483                 goto exit_del_fnode;
3484         }
3485
3486         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3487         if (!shost) {
3488                 pr_err("%s could not find host no %u\n",
3489                        __func__, ev->u.del_flashnode.host_no);
3490                 err = -ENODEV;
3491                 goto put_host;
3492         }
3493
3494         idx = ev->u.del_flashnode.flashnode_idx;
3495         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3496         if (!fnode_sess) {
3497                 pr_err("%s could not find flashnode %u for host no %u\n",
3498                        __func__, idx, ev->u.del_flashnode.host_no);
3499                 err = -ENODEV;
3500                 goto put_host;
3501         }
3502
3503         err = transport->del_flashnode(fnode_sess);
3504         put_device(&fnode_sess->dev);
3505
3506 put_host:
3507         scsi_host_put(shost);
3508
3509 exit_del_fnode:
3510         return err;
3511 }
3512
3513 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3514                                  struct iscsi_uevent *ev)
3515 {
3516         struct Scsi_Host *shost;
3517         struct iscsi_bus_flash_session *fnode_sess;
3518         struct iscsi_bus_flash_conn *fnode_conn;
3519         struct device *dev;
3520         uint32_t idx;
3521         int err = 0;
3522
3523         if (!transport->login_flashnode) {
3524                 err = -ENOSYS;
3525                 goto exit_login_fnode;
3526         }
3527
3528         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3529         if (!shost) {
3530                 pr_err("%s could not find host no %u\n",
3531                        __func__, ev->u.login_flashnode.host_no);
3532                 err = -ENODEV;
3533                 goto put_host;
3534         }
3535
3536         idx = ev->u.login_flashnode.flashnode_idx;
3537         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3538         if (!fnode_sess) {
3539                 pr_err("%s could not find flashnode %u for host no %u\n",
3540                        __func__, idx, ev->u.login_flashnode.host_no);
3541                 err = -ENODEV;
3542                 goto put_host;
3543         }
3544
3545         dev = iscsi_find_flashnode_conn(fnode_sess);
3546         if (!dev) {
3547                 err = -ENODEV;
3548                 goto put_sess;
3549         }
3550
3551         fnode_conn = iscsi_dev_to_flash_conn(dev);
3552         err = transport->login_flashnode(fnode_sess, fnode_conn);
3553         put_device(dev);
3554
3555 put_sess:
3556         put_device(&fnode_sess->dev);
3557
3558 put_host:
3559         scsi_host_put(shost);
3560
3561 exit_login_fnode:
3562         return err;
3563 }
3564
3565 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3566                                   struct iscsi_uevent *ev)
3567 {
3568         struct Scsi_Host *shost;
3569         struct iscsi_bus_flash_session *fnode_sess;
3570         struct iscsi_bus_flash_conn *fnode_conn;
3571         struct device *dev;
3572         uint32_t idx;
3573         int err = 0;
3574
3575         if (!transport->logout_flashnode) {
3576                 err = -ENOSYS;
3577                 goto exit_logout_fnode;
3578         }
3579
3580         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3581         if (!shost) {
3582                 pr_err("%s could not find host no %u\n",
3583                        __func__, ev->u.logout_flashnode.host_no);
3584                 err = -ENODEV;
3585                 goto put_host;
3586         }
3587
3588         idx = ev->u.logout_flashnode.flashnode_idx;
3589         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3590         if (!fnode_sess) {
3591                 pr_err("%s could not find flashnode %u for host no %u\n",
3592                        __func__, idx, ev->u.logout_flashnode.host_no);
3593                 err = -ENODEV;
3594                 goto put_host;
3595         }
3596
3597         dev = iscsi_find_flashnode_conn(fnode_sess);
3598         if (!dev) {
3599                 err = -ENODEV;
3600                 goto put_sess;
3601         }
3602
3603         fnode_conn = iscsi_dev_to_flash_conn(dev);
3604
3605         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3606         put_device(dev);
3607
3608 put_sess:
3609         put_device(&fnode_sess->dev);
3610
3611 put_host:
3612         scsi_host_put(shost);
3613
3614 exit_logout_fnode:
3615         return err;
3616 }
3617
3618 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3619                                       struct iscsi_uevent *ev)
3620 {
3621         struct Scsi_Host *shost;
3622         struct iscsi_cls_session *session;
3623         int err = 0;
3624
3625         if (!transport->logout_flashnode_sid) {
3626                 err = -ENOSYS;
3627                 goto exit_logout_sid;
3628         }
3629
3630         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3631         if (!shost) {
3632                 pr_err("%s could not find host no %u\n",
3633                        __func__, ev->u.logout_flashnode.host_no);
3634                 err = -ENODEV;
3635                 goto put_host;
3636         }
3637
3638         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3639         if (!session) {
3640                 pr_err("%s could not find session id %u\n",
3641                        __func__, ev->u.logout_flashnode_sid.sid);
3642                 err = -EINVAL;
3643                 goto put_host;
3644         }
3645
3646         err = transport->logout_flashnode_sid(session);
3647
3648 put_host:
3649         scsi_host_put(shost);
3650
3651 exit_logout_sid:
3652         return err;
3653 }
3654
3655 static int
3656 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3657 {
3658         struct iscsi_uevent *ev = nlmsg_data(nlh);
3659         struct Scsi_Host *shost = NULL;
3660         struct iscsi_internal *priv;
3661         struct sk_buff *skbhost_stats;
3662         struct nlmsghdr *nlhhost_stats;
3663         struct iscsi_uevent *evhost_stats;
3664         int host_stats_size = 0;
3665         int len, err = 0;
3666         char *buf;
3667
3668         if (!transport->get_host_stats)
3669                 return -ENOSYS;
3670
3671         priv = iscsi_if_transport_lookup(transport);
3672         if (!priv)
3673                 return -EINVAL;
3674
3675         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3676         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3677
3678         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3679         if (!shost) {
3680                 pr_err("%s: failed. Could not find host no %u\n",
3681                        __func__, ev->u.get_host_stats.host_no);
3682                 return -ENODEV;
3683         }
3684
3685         do {
3686                 int actual_size;
3687
3688                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3689                 if (!skbhost_stats) {
3690                         pr_err("cannot deliver host stats: OOM\n");
3691                         err = -ENOMEM;
3692                         goto exit_host_stats;
3693                 }
3694
3695                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3696                                       (len - sizeof(*nlhhost_stats)), 0);
3697                 evhost_stats = nlmsg_data(nlhhost_stats);
3698                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3699                 evhost_stats->transport_handle = iscsi_handle(transport);
3700                 evhost_stats->type = nlh->nlmsg_type;
3701                 evhost_stats->u.get_host_stats.host_no =
3702                                         ev->u.get_host_stats.host_no;
3703                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3704                 memset(buf, 0, host_stats_size);
3705
3706                 err = transport->get_host_stats(shost, buf, host_stats_size);
3707                 if (err) {
3708                         kfree_skb(skbhost_stats);
3709                         goto exit_host_stats;
3710                 }
3711
3712                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3713                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3714                 nlhhost_stats->nlmsg_len = actual_size;
3715
3716                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3717                                           GFP_KERNEL);
3718         } while (err < 0 && err != -ECONNREFUSED);
3719
3720 exit_host_stats:
3721         scsi_host_put(shost);
3722         return err;
3723 }
3724
3725 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3726                                    struct nlmsghdr *nlh)
3727 {
3728         struct iscsi_uevent *ev = nlmsg_data(nlh);
3729         struct iscsi_cls_session *session;
3730         struct iscsi_cls_conn *conn = NULL;
3731         struct iscsi_endpoint *ep;
3732         uint32_t pdu_len;
3733         int err = 0;
3734
3735         switch (nlh->nlmsg_type) {
3736         case ISCSI_UEVENT_CREATE_CONN:
3737                 return iscsi_if_create_conn(transport, ev);
3738         case ISCSI_UEVENT_DESTROY_CONN:
3739                 return iscsi_if_destroy_conn(transport, ev);
3740         case ISCSI_UEVENT_STOP_CONN:
3741                 return iscsi_if_stop_conn(transport, ev);
3742         }
3743
3744         /*
3745          * The following cmds need to be run under the ep_mutex so in kernel
3746          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3747          * these are running. They also must not run if we have just run a conn
3748          * cleanup because they would set the state in a way that might allow
3749          * IO or send IO themselves.
3750          */
3751         switch (nlh->nlmsg_type) {
3752         case ISCSI_UEVENT_START_CONN:
3753                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3754                                          ev->u.start_conn.cid);
3755                 break;
3756         case ISCSI_UEVENT_BIND_CONN:
3757                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3758                 break;
3759         case ISCSI_UEVENT_SEND_PDU:
3760                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3761                 break;
3762         }
3763
3764         if (!conn)
3765                 return -EINVAL;
3766
3767         mutex_lock(&conn->ep_mutex);
3768         spin_lock_irq(&conn->lock);
3769         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3770                 spin_unlock_irq(&conn->lock);
3771                 mutex_unlock(&conn->ep_mutex);
3772                 ev->r.retcode = -ENOTCONN;
3773                 return 0;
3774         }
3775         spin_unlock_irq(&conn->lock);
3776
3777         switch (nlh->nlmsg_type) {
3778         case ISCSI_UEVENT_BIND_CONN:
3779                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3780                 if (!session) {
3781                         err = -EINVAL;
3782                         break;
3783                 }
3784
3785                 ev->r.retcode = transport->bind_conn(session, conn,
3786                                                 ev->u.b_conn.transport_eph,
3787                                                 ev->u.b_conn.is_leading);
3788                 if (!ev->r.retcode)
3789                         WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3790
3791                 if (ev->r.retcode || !transport->ep_connect)
3792                         break;
3793
3794                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3795                 if (ep) {
3796                         ep->conn = conn;
3797                         conn->ep = ep;
3798                         iscsi_put_endpoint(ep);
3799                 } else {
3800                         err = -ENOTCONN;
3801                         iscsi_cls_conn_printk(KERN_ERR, conn,
3802                                               "Could not set ep conn binding\n");
3803                 }
3804                 break;
3805         case ISCSI_UEVENT_START_CONN:
3806                 ev->r.retcode = transport->start_conn(conn);
3807                 if (!ev->r.retcode)
3808                         WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3809
3810                 break;
3811         case ISCSI_UEVENT_SEND_PDU:
3812                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3813
3814                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3815                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3816                         err = -EINVAL;
3817                         break;
3818                 }
3819
3820                 ev->r.retcode = transport->send_pdu(conn,
3821                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3822                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3823                                 ev->u.send_pdu.data_size);
3824                 break;
3825         default:
3826                 err = -ENOSYS;
3827         }
3828
3829         mutex_unlock(&conn->ep_mutex);
3830         return err;
3831 }
3832
3833 static int
3834 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3835 {
3836         int err = 0;
3837         u32 portid;
3838         struct iscsi_uevent *ev = nlmsg_data(nlh);
3839         struct iscsi_transport *transport = NULL;
3840         struct iscsi_internal *priv;
3841         struct iscsi_cls_session *session;
3842         struct iscsi_endpoint *ep = NULL;
3843
3844         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3845                 return -EPERM;
3846
3847         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3848                 *group = ISCSI_NL_GRP_UIP;
3849         else
3850                 *group = ISCSI_NL_GRP_ISCSID;
3851
3852         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3853         if (!priv)
3854                 return -EINVAL;
3855         transport = priv->iscsi_transport;
3856
3857         if (!try_module_get(transport->owner))
3858                 return -EINVAL;
3859
3860         portid = NETLINK_CB(skb).portid;
3861
3862         switch (nlh->nlmsg_type) {
3863         case ISCSI_UEVENT_CREATE_SESSION:
3864                 err = iscsi_if_create_session(priv, ep, ev,
3865                                               portid,
3866                                               ev->u.c_session.initial_cmdsn,
3867                                               ev->u.c_session.cmds_max,
3868                                               ev->u.c_session.queue_depth);
3869                 break;
3870         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3871                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3872                 if (!ep) {
3873                         err = -EINVAL;
3874                         break;
3875                 }
3876
3877                 err = iscsi_if_create_session(priv, ep, ev,
3878                                         portid,
3879                                         ev->u.c_bound_session.initial_cmdsn,
3880                                         ev->u.c_bound_session.cmds_max,
3881                                         ev->u.c_bound_session.queue_depth);
3882                 iscsi_put_endpoint(ep);
3883                 break;
3884         case ISCSI_UEVENT_DESTROY_SESSION:
3885                 session = iscsi_session_lookup(ev->u.d_session.sid);
3886                 if (!session)
3887                         err = -EINVAL;
3888                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3889                         err = -EBUSY;
3890                 else
3891                         transport->destroy_session(session);
3892                 break;
3893         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3894                 session = iscsi_session_lookup(ev->u.d_session.sid);
3895                 if (!session)
3896                         err = -EINVAL;
3897                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3898                         err = -EBUSY;
3899                 else {
3900                         unsigned long flags;
3901
3902                         /* Prevent this session from being found again */
3903                         spin_lock_irqsave(&sesslock, flags);
3904                         list_del_init(&session->sess_list);
3905                         spin_unlock_irqrestore(&sesslock, flags);
3906
3907                         queue_work(system_unbound_wq, &session->destroy_work);
3908                 }
3909                 break;
3910         case ISCSI_UEVENT_UNBIND_SESSION:
3911                 session = iscsi_session_lookup(ev->u.d_session.sid);
3912                 if (session)
3913                         scsi_queue_work(iscsi_session_to_shost(session),
3914                                         &session->unbind_work);
3915                 else
3916                         err = -EINVAL;
3917                 break;
3918         case ISCSI_UEVENT_SET_PARAM:
3919                 err = iscsi_set_param(transport, ev);
3920                 break;
3921         case ISCSI_UEVENT_CREATE_CONN:
3922         case ISCSI_UEVENT_DESTROY_CONN:
3923         case ISCSI_UEVENT_STOP_CONN:
3924         case ISCSI_UEVENT_START_CONN:
3925         case ISCSI_UEVENT_BIND_CONN:
3926         case ISCSI_UEVENT_SEND_PDU:
3927                 err = iscsi_if_transport_conn(transport, nlh);
3928                 break;
3929         case ISCSI_UEVENT_GET_STATS:
3930                 err = iscsi_if_get_stats(transport, nlh);
3931                 break;
3932         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3933         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3934         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3935         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3936                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3937                 break;
3938         case ISCSI_UEVENT_TGT_DSCVR:
3939                 err = iscsi_tgt_dscvr(transport, ev);
3940                 break;
3941         case ISCSI_UEVENT_SET_HOST_PARAM:
3942                 err = iscsi_set_host_param(transport, ev);
3943                 break;
3944         case ISCSI_UEVENT_PATH_UPDATE:
3945                 err = iscsi_set_path(transport, ev);
3946                 break;
3947         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3948                 err = iscsi_set_iface_params(transport, ev,
3949                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3950                 break;
3951         case ISCSI_UEVENT_PING:
3952                 err = iscsi_send_ping(transport, ev);
3953                 break;
3954         case ISCSI_UEVENT_GET_CHAP:
3955                 err = iscsi_get_chap(transport, nlh);
3956                 break;
3957         case ISCSI_UEVENT_DELETE_CHAP:
3958                 err = iscsi_delete_chap(transport, ev);
3959                 break;
3960         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3961                 err = iscsi_set_flashnode_param(transport, ev,
3962                                                 nlmsg_attrlen(nlh,
3963                                                               sizeof(*ev)));
3964                 break;
3965         case ISCSI_UEVENT_NEW_FLASHNODE:
3966                 err = iscsi_new_flashnode(transport, ev,
3967                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3968                 break;
3969         case ISCSI_UEVENT_DEL_FLASHNODE:
3970                 err = iscsi_del_flashnode(transport, ev);
3971                 break;
3972         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3973                 err = iscsi_login_flashnode(transport, ev);
3974                 break;
3975         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3976                 err = iscsi_logout_flashnode(transport, ev);
3977                 break;
3978         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3979                 err = iscsi_logout_flashnode_sid(transport, ev);
3980                 break;
3981         case ISCSI_UEVENT_SET_CHAP:
3982                 err = iscsi_set_chap(transport, ev,
3983                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3984                 break;
3985         case ISCSI_UEVENT_GET_HOST_STATS:
3986                 err = iscsi_get_host_stats(transport, nlh);
3987                 break;
3988         default:
3989                 err = -ENOSYS;
3990                 break;
3991         }
3992
3993         module_put(transport->owner);
3994         return err;
3995 }
3996
3997 /*
3998  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3999  * Malformed skbs with wrong lengths or invalid creds are not processed.
4000  */
4001 static void
4002 iscsi_if_rx(struct sk_buff *skb)
4003 {
4004         u32 portid = NETLINK_CB(skb).portid;
4005
4006         mutex_lock(&rx_queue_mutex);
4007         while (skb->len >= NLMSG_HDRLEN) {
4008                 int err;
4009                 uint32_t rlen;
4010                 struct nlmsghdr *nlh;
4011                 struct iscsi_uevent *ev;
4012                 uint32_t group;
4013                 int retries = ISCSI_SEND_MAX_ALLOWED;
4014
4015                 nlh = nlmsg_hdr(skb);
4016                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4017                     skb->len < nlh->nlmsg_len) {
4018                         break;
4019                 }
4020
4021                 ev = nlmsg_data(nlh);
4022                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4023                 if (rlen > skb->len)
4024                         rlen = skb->len;
4025
4026                 err = iscsi_if_recv_msg(skb, nlh, &group);
4027                 if (err) {
4028                         ev->type = ISCSI_KEVENT_IF_ERROR;
4029                         ev->iferror = err;
4030                 }
4031                 do {
4032                         /*
4033                          * special case for GET_STATS:
4034                          * on success - sending reply and stats from
4035                          * inside of if_recv_msg(),
4036                          * on error - fall through.
4037                          */
4038                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4039                                 break;
4040                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4041                                 break;
4042                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4043                                                   ev, sizeof(*ev));
4044                         if (err == -EAGAIN && --retries < 0) {
4045                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4046                                 break;
4047                         }
4048                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4049                 skb_pull(skb, rlen);
4050         }
4051         mutex_unlock(&rx_queue_mutex);
4052 }
4053
4054 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4055 struct device_attribute dev_attr_##_prefix##_##_name =  \
4056         __ATTR(_name,_mode,_show,_store)
4057
4058 /*
4059  * iSCSI connection attrs
4060  */
4061 #define iscsi_conn_attr_show(param)                                     \
4062 static ssize_t                                                          \
4063 show_conn_param_##param(struct device *dev,                             \
4064                         struct device_attribute *attr, char *buf)       \
4065 {                                                                       \
4066         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4067         struct iscsi_transport *t = conn->transport;                    \
4068         return t->get_conn_param(conn, param, buf);                     \
4069 }
4070
4071 #define iscsi_conn_attr(field, param)                                   \
4072         iscsi_conn_attr_show(param)                                     \
4073 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4074                         NULL);
4075
4076 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4077 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4078 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4079 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4080 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4081 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4082 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4083 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4084 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4085 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4086 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4087 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4088 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4089 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4090 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4091 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4092 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4093 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4094 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4095 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4096 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4097 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4098 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4099 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4100 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4101 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4102 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4103 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4104
4105 static const char *const connection_state_names[] = {
4106         [ISCSI_CONN_UP] = "up",
4107         [ISCSI_CONN_DOWN] = "down",
4108         [ISCSI_CONN_FAILED] = "failed",
4109         [ISCSI_CONN_BOUND] = "bound"
4110 };
4111
4112 static ssize_t show_conn_state(struct device *dev,
4113                                struct device_attribute *attr, char *buf)
4114 {
4115         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4116         const char *state = "unknown";
4117         int conn_state = READ_ONCE(conn->state);
4118
4119         if (conn_state >= 0 &&
4120             conn_state < ARRAY_SIZE(connection_state_names))
4121                 state = connection_state_names[conn_state];
4122
4123         return sysfs_emit(buf, "%s\n", state);
4124 }
4125 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4126                         NULL);
4127
4128 #define iscsi_conn_ep_attr_show(param)                                  \
4129 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4130                                           struct device_attribute *attr,\
4131                                           char *buf)                    \
4132 {                                                                       \
4133         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4134         struct iscsi_transport *t = conn->transport;                    \
4135         struct iscsi_endpoint *ep;                                      \
4136         ssize_t rc;                                                     \
4137                                                                         \
4138         /*                                                              \
4139          * Need to make sure ep_disconnect does not free the LLD's      \
4140          * interconnect resources while we are trying to read them.     \
4141          */                                                             \
4142         mutex_lock(&conn->ep_mutex);                                    \
4143         ep = conn->ep;                                                  \
4144         if (!ep && t->ep_connect) {                                     \
4145                 mutex_unlock(&conn->ep_mutex);                          \
4146                 return -ENOTCONN;                                       \
4147         }                                                               \
4148                                                                         \
4149         if (ep)                                                         \
4150                 rc = t->get_ep_param(ep, param, buf);                   \
4151         else                                                            \
4152                 rc = t->get_conn_param(conn, param, buf);               \
4153         mutex_unlock(&conn->ep_mutex);                                  \
4154         return rc;                                                      \
4155 }
4156
4157 #define iscsi_conn_ep_attr(field, param)                                \
4158         iscsi_conn_ep_attr_show(param)                                  \
4159 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4160                         show_conn_ep_param_##param, NULL);
4161
4162 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4163 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4164
4165 static struct attribute *iscsi_conn_attrs[] = {
4166         &dev_attr_conn_max_recv_dlength.attr,
4167         &dev_attr_conn_max_xmit_dlength.attr,
4168         &dev_attr_conn_header_digest.attr,
4169         &dev_attr_conn_data_digest.attr,
4170         &dev_attr_conn_ifmarker.attr,
4171         &dev_attr_conn_ofmarker.attr,
4172         &dev_attr_conn_address.attr,
4173         &dev_attr_conn_port.attr,
4174         &dev_attr_conn_exp_statsn.attr,
4175         &dev_attr_conn_persistent_address.attr,
4176         &dev_attr_conn_persistent_port.attr,
4177         &dev_attr_conn_ping_tmo.attr,
4178         &dev_attr_conn_recv_tmo.attr,
4179         &dev_attr_conn_local_port.attr,
4180         &dev_attr_conn_statsn.attr,
4181         &dev_attr_conn_keepalive_tmo.attr,
4182         &dev_attr_conn_max_segment_size.attr,
4183         &dev_attr_conn_tcp_timestamp_stat.attr,
4184         &dev_attr_conn_tcp_wsf_disable.attr,
4185         &dev_attr_conn_tcp_nagle_disable.attr,
4186         &dev_attr_conn_tcp_timer_scale.attr,
4187         &dev_attr_conn_tcp_timestamp_enable.attr,
4188         &dev_attr_conn_fragment_disable.attr,
4189         &dev_attr_conn_ipv4_tos.attr,
4190         &dev_attr_conn_ipv6_traffic_class.attr,
4191         &dev_attr_conn_ipv6_flow_label.attr,
4192         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4193         &dev_attr_conn_tcp_xmit_wsf.attr,
4194         &dev_attr_conn_tcp_recv_wsf.attr,
4195         &dev_attr_conn_local_ipaddr.attr,
4196         &dev_attr_conn_state.attr,
4197         NULL,
4198 };
4199
4200 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4201                                          struct attribute *attr, int i)
4202 {
4203         struct device *cdev = container_of(kobj, struct device, kobj);
4204         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4205         struct iscsi_transport *t = conn->transport;
4206         int param;
4207
4208         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4209                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4210         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4211                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4212         else if (attr == &dev_attr_conn_header_digest.attr)
4213                 param = ISCSI_PARAM_HDRDGST_EN;
4214         else if (attr == &dev_attr_conn_data_digest.attr)
4215                 param = ISCSI_PARAM_DATADGST_EN;
4216         else if (attr == &dev_attr_conn_ifmarker.attr)
4217                 param = ISCSI_PARAM_IFMARKER_EN;
4218         else if (attr == &dev_attr_conn_ofmarker.attr)
4219                 param = ISCSI_PARAM_OFMARKER_EN;
4220         else if (attr == &dev_attr_conn_address.attr)
4221                 param = ISCSI_PARAM_CONN_ADDRESS;
4222         else if (attr == &dev_attr_conn_port.attr)
4223                 param = ISCSI_PARAM_CONN_PORT;
4224         else if (attr == &dev_attr_conn_exp_statsn.attr)
4225                 param = ISCSI_PARAM_EXP_STATSN;
4226         else if (attr == &dev_attr_conn_persistent_address.attr)
4227                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4228         else if (attr == &dev_attr_conn_persistent_port.attr)
4229                 param = ISCSI_PARAM_PERSISTENT_PORT;
4230         else if (attr == &dev_attr_conn_ping_tmo.attr)
4231                 param = ISCSI_PARAM_PING_TMO;
4232         else if (attr == &dev_attr_conn_recv_tmo.attr)
4233                 param = ISCSI_PARAM_RECV_TMO;
4234         else if (attr == &dev_attr_conn_local_port.attr)
4235                 param = ISCSI_PARAM_LOCAL_PORT;
4236         else if (attr == &dev_attr_conn_statsn.attr)
4237                 param = ISCSI_PARAM_STATSN;
4238         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4239                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4240         else if (attr == &dev_attr_conn_max_segment_size.attr)
4241                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4242         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4243                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4244         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4245                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4246         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4247                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4248         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4249                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4250         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4251                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4252         else if (attr == &dev_attr_conn_fragment_disable.attr)
4253                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4254         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4255                 param = ISCSI_PARAM_IPV4_TOS;
4256         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4257                 param = ISCSI_PARAM_IPV6_TC;
4258         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4259                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4260         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4261                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4262         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4263                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4264         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4265                 param = ISCSI_PARAM_TCP_RECV_WSF;
4266         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4267                 param = ISCSI_PARAM_LOCAL_IPADDR;
4268         else if (attr == &dev_attr_conn_state.attr)
4269                 return S_IRUGO;
4270         else {
4271                 WARN_ONCE(1, "Invalid conn attr");
4272                 return 0;
4273         }
4274
4275         return t->attr_is_visible(ISCSI_PARAM, param);
4276 }
4277
4278 static struct attribute_group iscsi_conn_group = {
4279         .attrs = iscsi_conn_attrs,
4280         .is_visible = iscsi_conn_attr_is_visible,
4281 };
4282
4283 /*
4284  * iSCSI session attrs
4285  */
4286 #define iscsi_session_attr_show(param, perm)                            \
4287 static ssize_t                                                          \
4288 show_session_param_##param(struct device *dev,                          \
4289                            struct device_attribute *attr, char *buf)    \
4290 {                                                                       \
4291         struct iscsi_cls_session *session =                             \
4292                 iscsi_dev_to_session(dev->parent);                      \
4293         struct iscsi_transport *t = session->transport;                 \
4294                                                                         \
4295         if (perm && !capable(CAP_SYS_ADMIN))                            \
4296                 return -EACCES;                                         \
4297         return t->get_session_param(session, param, buf);               \
4298 }
4299
4300 #define iscsi_session_attr(field, param, perm)                          \
4301         iscsi_session_attr_show(param, perm)                            \
4302 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4303                         NULL);
4304 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4305 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4306 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4307 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4308 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4309 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4310 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4311 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4312 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4313 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4314 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4315 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4316 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4317 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4318 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4319 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4320 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4321 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4322 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4323 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4324 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4325 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4326 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4327 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4328 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4329 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4330 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4331 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4332 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4333 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4334 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4335 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4336 iscsi_session_attr(discovery_auth_optional,
4337                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4338 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4339 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4340 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4341 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4342 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4343 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4344 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4345
4346 static ssize_t
4347 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4348                         char *buf)
4349 {
4350         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4351         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4352 }
4353 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4354                         NULL);
4355 static ssize_t
4356 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4357                         char *buf)
4358 {
4359         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4360         return sysfs_emit(buf, "%d\n", session->creator);
4361 }
4362 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4363                         NULL);
4364 static ssize_t
4365 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4366                             char *buf)
4367 {
4368         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4369         return sysfs_emit(buf, "%d\n", session->target_id);
4370 }
4371 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4372                         show_priv_session_target_id, NULL);
4373
4374 #define iscsi_priv_session_attr_show(field, format)                     \
4375 static ssize_t                                                          \
4376 show_priv_session_##field(struct device *dev,                           \
4377                           struct device_attribute *attr, char *buf)     \
4378 {                                                                       \
4379         struct iscsi_cls_session *session =                             \
4380                         iscsi_dev_to_session(dev->parent);              \
4381         if (session->field == -1)                                       \
4382                 return sysfs_emit(buf, "off\n");                        \
4383         return sysfs_emit(buf, format"\n", session->field);             \
4384 }
4385
4386 #define iscsi_priv_session_attr_store(field)                            \
4387 static ssize_t                                                          \
4388 store_priv_session_##field(struct device *dev,                          \
4389                            struct device_attribute *attr,               \
4390                            const char *buf, size_t count)               \
4391 {                                                                       \
4392         int val;                                                        \
4393         char *cp;                                                       \
4394         struct iscsi_cls_session *session =                             \
4395                 iscsi_dev_to_session(dev->parent);                      \
4396         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4397             (session->state == ISCSI_SESSION_FAILED))                   \
4398                 return -EBUSY;                                          \
4399         if (strncmp(buf, "off", 3) == 0) {                              \
4400                 session->field = -1;                                    \
4401                 session->field##_sysfs_override = true;                 \
4402         } else {                                                        \
4403                 val = simple_strtoul(buf, &cp, 0);                      \
4404                 if (*cp != '\0' && *cp != '\n')                         \
4405                         return -EINVAL;                                 \
4406                 session->field = val;                                   \
4407                 session->field##_sysfs_override = true;                 \
4408         }                                                               \
4409         return count;                                                   \
4410 }
4411
4412 #define iscsi_priv_session_rw_attr(field, format)                       \
4413         iscsi_priv_session_attr_show(field, format)                     \
4414         iscsi_priv_session_attr_store(field)                            \
4415 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4416                         show_priv_session_##field,                      \
4417                         store_priv_session_##field)
4418
4419 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4420
4421 static struct attribute *iscsi_session_attrs[] = {
4422         &dev_attr_sess_initial_r2t.attr,
4423         &dev_attr_sess_max_outstanding_r2t.attr,
4424         &dev_attr_sess_immediate_data.attr,
4425         &dev_attr_sess_first_burst_len.attr,
4426         &dev_attr_sess_max_burst_len.attr,
4427         &dev_attr_sess_data_pdu_in_order.attr,
4428         &dev_attr_sess_data_seq_in_order.attr,
4429         &dev_attr_sess_erl.attr,
4430         &dev_attr_sess_targetname.attr,
4431         &dev_attr_sess_tpgt.attr,
4432         &dev_attr_sess_password.attr,
4433         &dev_attr_sess_password_in.attr,
4434         &dev_attr_sess_username.attr,
4435         &dev_attr_sess_username_in.attr,
4436         &dev_attr_sess_fast_abort.attr,
4437         &dev_attr_sess_abort_tmo.attr,
4438         &dev_attr_sess_lu_reset_tmo.attr,
4439         &dev_attr_sess_tgt_reset_tmo.attr,
4440         &dev_attr_sess_ifacename.attr,
4441         &dev_attr_sess_initiatorname.attr,
4442         &dev_attr_sess_targetalias.attr,
4443         &dev_attr_sess_boot_root.attr,
4444         &dev_attr_sess_boot_nic.attr,
4445         &dev_attr_sess_boot_target.attr,
4446         &dev_attr_priv_sess_recovery_tmo.attr,
4447         &dev_attr_priv_sess_state.attr,
4448         &dev_attr_priv_sess_creator.attr,
4449         &dev_attr_sess_chap_out_idx.attr,
4450         &dev_attr_sess_chap_in_idx.attr,
4451         &dev_attr_priv_sess_target_id.attr,
4452         &dev_attr_sess_auto_snd_tgt_disable.attr,
4453         &dev_attr_sess_discovery_session.attr,
4454         &dev_attr_sess_portal_type.attr,
4455         &dev_attr_sess_chap_auth.attr,
4456         &dev_attr_sess_discovery_logout.attr,
4457         &dev_attr_sess_bidi_chap.attr,
4458         &dev_attr_sess_discovery_auth_optional.attr,
4459         &dev_attr_sess_def_time2wait.attr,
4460         &dev_attr_sess_def_time2retain.attr,
4461         &dev_attr_sess_isid.attr,
4462         &dev_attr_sess_tsid.attr,
4463         &dev_attr_sess_def_taskmgmt_tmo.attr,
4464         &dev_attr_sess_discovery_parent_idx.attr,
4465         &dev_attr_sess_discovery_parent_type.attr,
4466         NULL,
4467 };
4468
4469 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4470                                             struct attribute *attr, int i)
4471 {
4472         struct device *cdev = container_of(kobj, struct device, kobj);
4473         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4474         struct iscsi_transport *t = session->transport;
4475         int param;
4476
4477         if (attr == &dev_attr_sess_initial_r2t.attr)
4478                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4479         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4480                 param = ISCSI_PARAM_MAX_R2T;
4481         else if (attr == &dev_attr_sess_immediate_data.attr)
4482                 param = ISCSI_PARAM_IMM_DATA_EN;
4483         else if (attr == &dev_attr_sess_first_burst_len.attr)
4484                 param = ISCSI_PARAM_FIRST_BURST;
4485         else if (attr == &dev_attr_sess_max_burst_len.attr)
4486                 param = ISCSI_PARAM_MAX_BURST;
4487         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4488                 param = ISCSI_PARAM_PDU_INORDER_EN;
4489         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4490                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4491         else if (attr == &dev_attr_sess_erl.attr)
4492                 param = ISCSI_PARAM_ERL;
4493         else if (attr == &dev_attr_sess_targetname.attr)
4494                 param = ISCSI_PARAM_TARGET_NAME;
4495         else if (attr == &dev_attr_sess_tpgt.attr)
4496                 param = ISCSI_PARAM_TPGT;
4497         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4498                 param = ISCSI_PARAM_CHAP_IN_IDX;
4499         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4500                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4501         else if (attr == &dev_attr_sess_password.attr)
4502                 param = ISCSI_PARAM_USERNAME;
4503         else if (attr == &dev_attr_sess_password_in.attr)
4504                 param = ISCSI_PARAM_USERNAME_IN;
4505         else if (attr == &dev_attr_sess_username.attr)
4506                 param = ISCSI_PARAM_PASSWORD;
4507         else if (attr == &dev_attr_sess_username_in.attr)
4508                 param = ISCSI_PARAM_PASSWORD_IN;
4509         else if (attr == &dev_attr_sess_fast_abort.attr)
4510                 param = ISCSI_PARAM_FAST_ABORT;
4511         else if (attr == &dev_attr_sess_abort_tmo.attr)
4512                 param = ISCSI_PARAM_ABORT_TMO;
4513         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4514                 param = ISCSI_PARAM_LU_RESET_TMO;
4515         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4516                 param = ISCSI_PARAM_TGT_RESET_TMO;
4517         else if (attr == &dev_attr_sess_ifacename.attr)
4518                 param = ISCSI_PARAM_IFACE_NAME;
4519         else if (attr == &dev_attr_sess_initiatorname.attr)
4520                 param = ISCSI_PARAM_INITIATOR_NAME;
4521         else if (attr == &dev_attr_sess_targetalias.attr)
4522                 param = ISCSI_PARAM_TARGET_ALIAS;
4523         else if (attr == &dev_attr_sess_boot_root.attr)
4524                 param = ISCSI_PARAM_BOOT_ROOT;
4525         else if (attr == &dev_attr_sess_boot_nic.attr)
4526                 param = ISCSI_PARAM_BOOT_NIC;
4527         else if (attr == &dev_attr_sess_boot_target.attr)
4528                 param = ISCSI_PARAM_BOOT_TARGET;
4529         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4530                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4531         else if (attr == &dev_attr_sess_discovery_session.attr)
4532                 param = ISCSI_PARAM_DISCOVERY_SESS;
4533         else if (attr == &dev_attr_sess_portal_type.attr)
4534                 param = ISCSI_PARAM_PORTAL_TYPE;
4535         else if (attr == &dev_attr_sess_chap_auth.attr)
4536                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4537         else if (attr == &dev_attr_sess_discovery_logout.attr)
4538                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4539         else if (attr == &dev_attr_sess_bidi_chap.attr)
4540                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4541         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4542                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4543         else if (attr == &dev_attr_sess_def_time2wait.attr)
4544                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4545         else if (attr == &dev_attr_sess_def_time2retain.attr)
4546                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4547         else if (attr == &dev_attr_sess_isid.attr)
4548                 param = ISCSI_PARAM_ISID;
4549         else if (attr == &dev_attr_sess_tsid.attr)
4550                 param = ISCSI_PARAM_TSID;
4551         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4552                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4553         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4554                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4555         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4556                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4557         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4558                 return S_IRUGO | S_IWUSR;
4559         else if (attr == &dev_attr_priv_sess_state.attr)
4560                 return S_IRUGO;
4561         else if (attr == &dev_attr_priv_sess_creator.attr)
4562                 return S_IRUGO;
4563         else if (attr == &dev_attr_priv_sess_target_id.attr)
4564                 return S_IRUGO;
4565         else {
4566                 WARN_ONCE(1, "Invalid session attr");
4567                 return 0;
4568         }
4569
4570         return t->attr_is_visible(ISCSI_PARAM, param);
4571 }
4572
4573 static struct attribute_group iscsi_session_group = {
4574         .attrs = iscsi_session_attrs,
4575         .is_visible = iscsi_session_attr_is_visible,
4576 };
4577
4578 /*
4579  * iSCSI host attrs
4580  */
4581 #define iscsi_host_attr_show(param)                                     \
4582 static ssize_t                                                          \
4583 show_host_param_##param(struct device *dev,                             \
4584                         struct device_attribute *attr, char *buf)       \
4585 {                                                                       \
4586         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4587         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4588         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4589 }
4590
4591 #define iscsi_host_attr(field, param)                                   \
4592         iscsi_host_attr_show(param)                                     \
4593 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4594                         NULL);
4595
4596 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4597 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4598 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4599 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4600 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4601 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4602
4603 static struct attribute *iscsi_host_attrs[] = {
4604         &dev_attr_host_netdev.attr,
4605         &dev_attr_host_hwaddress.attr,
4606         &dev_attr_host_ipaddress.attr,
4607         &dev_attr_host_initiatorname.attr,
4608         &dev_attr_host_port_state.attr,
4609         &dev_attr_host_port_speed.attr,
4610         NULL,
4611 };
4612
4613 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4614                                          struct attribute *attr, int i)
4615 {
4616         struct device *cdev = container_of(kobj, struct device, kobj);
4617         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4618         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4619         int param;
4620
4621         if (attr == &dev_attr_host_netdev.attr)
4622                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4623         else if (attr == &dev_attr_host_hwaddress.attr)
4624                 param = ISCSI_HOST_PARAM_HWADDRESS;
4625         else if (attr == &dev_attr_host_ipaddress.attr)
4626                 param = ISCSI_HOST_PARAM_IPADDRESS;
4627         else if (attr == &dev_attr_host_initiatorname.attr)
4628                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4629         else if (attr == &dev_attr_host_port_state.attr)
4630                 param = ISCSI_HOST_PARAM_PORT_STATE;
4631         else if (attr == &dev_attr_host_port_speed.attr)
4632                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4633         else {
4634                 WARN_ONCE(1, "Invalid host attr");
4635                 return 0;
4636         }
4637
4638         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4639 }
4640
4641 static struct attribute_group iscsi_host_group = {
4642         .attrs = iscsi_host_attrs,
4643         .is_visible = iscsi_host_attr_is_visible,
4644 };
4645
4646 /* convert iscsi_port_speed values to ascii string name */
4647 static const struct {
4648         enum iscsi_port_speed   value;
4649         char                    *name;
4650 } iscsi_port_speed_names[] = {
4651         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4652         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4653         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4654         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4655         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4656         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4657         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4658 };
4659
4660 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4661 {
4662         int i;
4663         char *speed = "Unknown!";
4664         struct iscsi_cls_host *ihost = shost->shost_data;
4665         uint32_t port_speed = ihost->port_speed;
4666
4667         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4668                 if (iscsi_port_speed_names[i].value & port_speed) {
4669                         speed = iscsi_port_speed_names[i].name;
4670                         break;
4671                 }
4672         }
4673         return speed;
4674 }
4675 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4676
4677 /* convert iscsi_port_state values to ascii string name */
4678 static const struct {
4679         enum iscsi_port_state   value;
4680         char                    *name;
4681 } iscsi_port_state_names[] = {
4682         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4683         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4684 };
4685
4686 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4687 {
4688         int i;
4689         char *state = "Unknown!";
4690         struct iscsi_cls_host *ihost = shost->shost_data;
4691         uint32_t port_state = ihost->port_state;
4692
4693         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4694                 if (iscsi_port_state_names[i].value & port_state) {
4695                         state = iscsi_port_state_names[i].name;
4696                         break;
4697                 }
4698         }
4699         return state;
4700 }
4701 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4702
4703 static int iscsi_session_match(struct attribute_container *cont,
4704                            struct device *dev)
4705 {
4706         struct iscsi_cls_session *session;
4707         struct Scsi_Host *shost;
4708         struct iscsi_internal *priv;
4709
4710         if (!iscsi_is_session_dev(dev))
4711                 return 0;
4712
4713         session = iscsi_dev_to_session(dev);
4714         shost = iscsi_session_to_shost(session);
4715         if (!shost->transportt)
4716                 return 0;
4717
4718         priv = to_iscsi_internal(shost->transportt);
4719         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4720                 return 0;
4721
4722         return &priv->session_cont.ac == cont;
4723 }
4724
4725 static int iscsi_conn_match(struct attribute_container *cont,
4726                            struct device *dev)
4727 {
4728         struct iscsi_cls_session *session;
4729         struct iscsi_cls_conn *conn;
4730         struct Scsi_Host *shost;
4731         struct iscsi_internal *priv;
4732
4733         if (!iscsi_is_conn_dev(dev))
4734                 return 0;
4735
4736         conn = iscsi_dev_to_conn(dev);
4737         session = iscsi_dev_to_session(conn->dev.parent);
4738         shost = iscsi_session_to_shost(session);
4739
4740         if (!shost->transportt)
4741                 return 0;
4742
4743         priv = to_iscsi_internal(shost->transportt);
4744         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4745                 return 0;
4746
4747         return &priv->conn_cont.ac == cont;
4748 }
4749
4750 static int iscsi_host_match(struct attribute_container *cont,
4751                             struct device *dev)
4752 {
4753         struct Scsi_Host *shost;
4754         struct iscsi_internal *priv;
4755
4756         if (!scsi_is_host_device(dev))
4757                 return 0;
4758
4759         shost = dev_to_shost(dev);
4760         if (!shost->transportt  ||
4761             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4762                 return 0;
4763
4764         priv = to_iscsi_internal(shost->transportt);
4765         return &priv->t.host_attrs.ac == cont;
4766 }
4767
4768 struct scsi_transport_template *
4769 iscsi_register_transport(struct iscsi_transport *tt)
4770 {
4771         struct iscsi_internal *priv;
4772         unsigned long flags;
4773         int err;
4774
4775         BUG_ON(!tt);
4776         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4777
4778         priv = iscsi_if_transport_lookup(tt);
4779         if (priv)
4780                 return NULL;
4781
4782         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4783         if (!priv)
4784                 return NULL;
4785         INIT_LIST_HEAD(&priv->list);
4786         priv->iscsi_transport = tt;
4787         priv->t.user_scan = iscsi_user_scan;
4788         priv->t.create_work_queue = 1;
4789
4790         priv->dev.class = &iscsi_transport_class;
4791         dev_set_name(&priv->dev, "%s", tt->name);
4792         err = device_register(&priv->dev);
4793         if (err)
4794                 goto free_priv;
4795
4796         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4797         if (err)
4798                 goto unregister_dev;
4799
4800         /* host parameters */
4801         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4802         priv->t.host_attrs.ac.match = iscsi_host_match;
4803         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4804         priv->t.host_size = sizeof(struct iscsi_cls_host);
4805         transport_container_register(&priv->t.host_attrs);
4806
4807         /* connection parameters */
4808         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4809         priv->conn_cont.ac.match = iscsi_conn_match;
4810         priv->conn_cont.ac.grp = &iscsi_conn_group;
4811         transport_container_register(&priv->conn_cont);
4812
4813         /* session parameters */
4814         priv->session_cont.ac.class = &iscsi_session_class.class;
4815         priv->session_cont.ac.match = iscsi_session_match;
4816         priv->session_cont.ac.grp = &iscsi_session_group;
4817         transport_container_register(&priv->session_cont);
4818
4819         spin_lock_irqsave(&iscsi_transport_lock, flags);
4820         list_add(&priv->list, &iscsi_transports);
4821         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4822
4823         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4824         return &priv->t;
4825
4826 unregister_dev:
4827         device_unregister(&priv->dev);
4828         return NULL;
4829 free_priv:
4830         kfree(priv);
4831         return NULL;
4832 }
4833 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4834
4835 int iscsi_unregister_transport(struct iscsi_transport *tt)
4836 {
4837         struct iscsi_internal *priv;
4838         unsigned long flags;
4839
4840         BUG_ON(!tt);
4841
4842         mutex_lock(&rx_queue_mutex);
4843
4844         priv = iscsi_if_transport_lookup(tt);
4845         BUG_ON (!priv);
4846
4847         spin_lock_irqsave(&iscsi_transport_lock, flags);
4848         list_del(&priv->list);
4849         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4850
4851         transport_container_unregister(&priv->conn_cont);
4852         transport_container_unregister(&priv->session_cont);
4853         transport_container_unregister(&priv->t.host_attrs);
4854
4855         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4856         device_unregister(&priv->dev);
4857         mutex_unlock(&rx_queue_mutex);
4858
4859         return 0;
4860 }
4861 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4862
4863 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4864                      struct device *dev, const char *fmt, ...)
4865 {
4866         struct va_format vaf;
4867         va_list args;
4868
4869         va_start(args, fmt);
4870         vaf.fmt = fmt;
4871         vaf.va = &args;
4872         trace(dev, &vaf);
4873         va_end(args);
4874 }
4875 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4876
4877 static __init int iscsi_transport_init(void)
4878 {
4879         int err;
4880         struct netlink_kernel_cfg cfg = {
4881                 .groups = 1,
4882                 .input  = iscsi_if_rx,
4883         };
4884         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4885                 ISCSI_TRANSPORT_VERSION);
4886
4887         atomic_set(&iscsi_session_nr, 0);
4888
4889         err = class_register(&iscsi_transport_class);
4890         if (err)
4891                 return err;
4892
4893         err = class_register(&iscsi_endpoint_class);
4894         if (err)
4895                 goto unregister_transport_class;
4896
4897         err = class_register(&iscsi_iface_class);
4898         if (err)
4899                 goto unregister_endpoint_class;
4900
4901         err = transport_class_register(&iscsi_host_class);
4902         if (err)
4903                 goto unregister_iface_class;
4904
4905         err = transport_class_register(&iscsi_connection_class);
4906         if (err)
4907                 goto unregister_host_class;
4908
4909         err = transport_class_register(&iscsi_session_class);
4910         if (err)
4911                 goto unregister_conn_class;
4912
4913         err = bus_register(&iscsi_flashnode_bus);
4914         if (err)
4915                 goto unregister_session_class;
4916
4917         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4918         if (!nls) {
4919                 err = -ENOBUFS;
4920                 goto unregister_flashnode_bus;
4921         }
4922
4923         iscsi_eh_timer_workq = alloc_workqueue("%s",
4924                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4925                         1, "iscsi_eh");
4926         if (!iscsi_eh_timer_workq) {
4927                 err = -ENOMEM;
4928                 goto release_nls;
4929         }
4930
4931         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4932                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4933                         "iscsi_conn_cleanup");
4934         if (!iscsi_conn_cleanup_workq) {
4935                 err = -ENOMEM;
4936                 goto destroy_wq;
4937         }
4938
4939         return 0;
4940
4941 destroy_wq:
4942         destroy_workqueue(iscsi_eh_timer_workq);
4943 release_nls:
4944         netlink_kernel_release(nls);
4945 unregister_flashnode_bus:
4946         bus_unregister(&iscsi_flashnode_bus);
4947 unregister_session_class:
4948         transport_class_unregister(&iscsi_session_class);
4949 unregister_conn_class:
4950         transport_class_unregister(&iscsi_connection_class);
4951 unregister_host_class:
4952         transport_class_unregister(&iscsi_host_class);
4953 unregister_iface_class:
4954         class_unregister(&iscsi_iface_class);
4955 unregister_endpoint_class:
4956         class_unregister(&iscsi_endpoint_class);
4957 unregister_transport_class:
4958         class_unregister(&iscsi_transport_class);
4959         return err;
4960 }
4961
4962 static void __exit iscsi_transport_exit(void)
4963 {
4964         destroy_workqueue(iscsi_conn_cleanup_workq);
4965         destroy_workqueue(iscsi_eh_timer_workq);
4966         netlink_kernel_release(nls);
4967         bus_unregister(&iscsi_flashnode_bus);
4968         transport_class_unregister(&iscsi_connection_class);
4969         transport_class_unregister(&iscsi_session_class);
4970         transport_class_unregister(&iscsi_host_class);
4971         class_unregister(&iscsi_endpoint_class);
4972         class_unregister(&iscsi_iface_class);
4973         class_unregister(&iscsi_transport_class);
4974 }
4975
4976 module_init(iscsi_transport_init);
4977 module_exit(iscsi_transport_exit);
4978
4979 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4980               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4981               "Alex Aizman <itn780@yahoo.com>");
4982 MODULE_DESCRIPTION("iSCSI Transport Interface");
4983 MODULE_LICENSE("GPL");
4984 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4985 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);