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