drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <net/tcp.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_iscsi.h>
  34 #include <scsi/iscsi_if.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_bsg_iscsi.h>
  37
  38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  39
  40 #define ISCSI_SEND_MAX_ALLOWED  10
  41
  42 static int dbg_session;
  43 module_param_named(debug_session, dbg_session, int,
  44                    S_IRUGO | S_IWUSR);
  45 MODULE_PARM_DESC(debug_session,
  46                  "Turn on debugging for sessions in scsi_transport_iscsi "
  47                  "module. Set to 1 to turn on, and zero to turn off. Default "
  48                  "is off.");
  49
  50 static int dbg_conn;
  51 module_param_named(debug_conn, dbg_conn, int,
  52                    S_IRUGO | S_IWUSR);
  53 MODULE_PARM_DESC(debug_conn,
  54                  "Turn on debugging for connections in scsi_transport_iscsi "
  55                  "module. Set to 1 to turn on, and zero to turn off. Default "
  56                  "is off.");
  57
  58 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  59         do {                                                            \
  60                 if (dbg_session)                                        \
  61                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  62                                                  "%s: " dbg_fmt,        \
  63                                                  __func__, ##arg);      \
  64         } while (0);
  65
  66 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  67         do {                                                            \
  68                 if (dbg_conn)                                           \
  69                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  70                                               "%s: " dbg_fmt,           \
  71                                               __func__, ##arg); \
  72         } while (0);
  73
  74 struct iscsi_internal {
  75         struct scsi_transport_template t;
  76         struct iscsi_transport *iscsi_transport;
  77         struct list_head list;
  78         struct device dev;
  79
  80         struct transport_container conn_cont;
  81         struct transport_container session_cont;
  82 };
  83
  84 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  85 static struct workqueue_struct *iscsi_eh_timer_workq;
  86
  87 static DEFINE_IDA(iscsi_sess_ida);
  88 /*
  89  * list of registered transports and lock that must
  90  * be held while accessing list. The iscsi_transport_lock must
  91  * be acquired after the rx_queue_mutex.
  92  */
  93 static LIST_HEAD(iscsi_transports);
  94 static DEFINE_SPINLOCK(iscsi_transport_lock);
  95
  96 #define to_iscsi_internal(tmpl) \
  97         container_of(tmpl, struct iscsi_internal, t)
  98
  99 #define dev_to_iscsi_internal(_dev) \
 100         container_of(_dev, struct iscsi_internal, dev)
 101
 102 static void iscsi_transport_release(struct device *dev)
 103 {
 104         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 105         kfree(priv);
 106 }
 107
 108 /*
 109  * iscsi_transport_class represents the iscsi_transports that are
 110  * registered.
 111  */
 112 static struct class iscsi_transport_class = {
 113         .name = "iscsi_transport",
 114         .dev_release = iscsi_transport_release,
 115 };
 116
 117 static ssize_t
 118 show_transport_handle(struct device *dev, struct device_attribute *attr,
 119                       char *buf)
 120 {
 121         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 122
 123         if (!capable(CAP_SYS_ADMIN))
 124                 return -EACCES;
 125         return sysfs_emit(buf, "%llu\n",
 126                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 127 }
 128 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 129
 130 #define show_transport_attr(name, format)                               \
 131 static ssize_t                                                          \
 132 show_transport_##name(struct device *dev,                               \
 133                       struct device_attribute *attr,char *buf)          \
 134 {                                                                       \
 135         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 136         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 137 }                                                                       \
 138 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 139
 140 show_transport_attr(caps, "0x%x");
 141
 142 static struct attribute *iscsi_transport_attrs[] = {
 143         &dev_attr_handle.attr,
 144         &dev_attr_caps.attr,
 145         NULL,
 146 };
 147
 148 static struct attribute_group iscsi_transport_group = {
 149         .attrs = iscsi_transport_attrs,
 150 };
 151
 152 /*
 153  * iSCSI endpoint attrs
 154  */
 155 #define iscsi_dev_to_endpoint(_dev) \
 156         container_of(_dev, struct iscsi_endpoint, dev)
 157
 158 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 159 struct device_attribute dev_attr_##_prefix##_##_name =  \
 160         __ATTR(_name,_mode,_show,_store)
 161
 162 static void iscsi_endpoint_release(struct device *dev)
 163 {
 164         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 165         kfree(ep);
 166 }
 167
 168 static struct class iscsi_endpoint_class = {
 169         .name = "iscsi_endpoint",
 170         .dev_release = iscsi_endpoint_release,
 171 };
 172
 173 static ssize_t
 174 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 175 {
 176         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 177         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 178 }
 179 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 180
 181 static struct attribute *iscsi_endpoint_attrs[] = {
 182         &dev_attr_ep_handle.attr,
 183         NULL,
 184 };
 185
 186 static struct attribute_group iscsi_endpoint_group = {
 187         .attrs = iscsi_endpoint_attrs,
 188 };
 189
 190 #define ISCSI_MAX_EPID -1
 191
 192 static int iscsi_match_epid(struct device *dev, const void *data)
 193 {
 194         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 195         const uint64_t *epid = data;
 196
 197         return *epid == ep->id;
 198 }
 199
 200 struct iscsi_endpoint *
 201 iscsi_create_endpoint(int dd_size)
 202 {
 203         struct device *dev;
 204         struct iscsi_endpoint *ep;
 205         uint64_t id;
 206         int err;
 207
 208         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 209                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 210                                         iscsi_match_epid);
 211                 if (!dev)
 212                         break;
 213                 else
 214                         put_device(dev);
 215         }
 216         if (id == ISCSI_MAX_EPID) {
 217                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 218                        ISCSI_MAX_EPID - 1);
 219                 return NULL;
 220         }
 221
 222         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 223         if (!ep)
 224                 return NULL;
 225
 226         ep->id = id;
 227         ep->dev.class = &iscsi_endpoint_class;
 228         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 229         err = device_register(&ep->dev);
 230         if (err)
 231                 goto free_ep;
 232
 233         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 234         if (err)
 235                 goto unregister_dev;
 236
 237         if (dd_size)
 238                 ep->dd_data = &ep[1];
 239         return ep;
 240
 241 unregister_dev:
 242         device_unregister(&ep->dev);
 243         return NULL;
 244
 245 free_ep:
 246         kfree(ep);
 247         return NULL;
 248 }
 249 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 250
 251 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 252 {
 253         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 254         device_unregister(&ep->dev);
 255 }
 256 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 257
 258 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 259 {
 260         struct iscsi_endpoint *ep;
 261         struct device *dev;
 262
 263         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 264                                 iscsi_match_epid);
 265         if (!dev)
 266                 return NULL;
 267
 268         ep = iscsi_dev_to_endpoint(dev);
 269         /*
 270          * we can drop this now because the interface will prevent
 271          * removals and lookups from racing.
 272          */
 273         put_device(dev);
 274         return ep;
 275 }
 276 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 277
 278 /*
 279  * Interface to display network param to sysfs
 280  */
 281
 282 static void iscsi_iface_release(struct device *dev)
 283 {
 284         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 285         struct device *parent = iface->dev.parent;
 286
 287         kfree(iface);
 288         put_device(parent);
 289 }
 290
 291
 292 static struct class iscsi_iface_class = {
 293         .name = "iscsi_iface",
 294         .dev_release = iscsi_iface_release,
 295 };
 296
 297 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 298 struct device_attribute dev_attr_##_prefix##_##_name =          \
 299         __ATTR(_name, _mode, _show, _store)
 300
 301 /* iface attrs show */
 302 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 303 static ssize_t                                                          \
 304 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 305                      char *buf)                                         \
 306 {                                                                       \
 307         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 308         struct iscsi_transport *t = iface->transport;                   \
 309         return t->get_iface_param(iface, param_type, param, buf);       \
 310 }                                                                       \
 311
 312 #define iscsi_iface_net_attr(type, name, param)                         \
 313         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 314 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 315
 316 #define iscsi_iface_attr(type, name, param)                             \
 317         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 318 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 319
 320 /* generic read only ipv4 attribute */
 321 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 322 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 323 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 324 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 325 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 326                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 327 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 328                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 329 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 330 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 331 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 332                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 333 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 334                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 335 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 336                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 337 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 338                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 339 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 340                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 341 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 342                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 343 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 344                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 345 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 346                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 347 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 348                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 349 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 350
 351 /* generic read only ipv6 attribute */
 352 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 353 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 354                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 355 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 356 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 357                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 358 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 359                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 360 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 361                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 362 iscsi_iface_net_attr(ipv6_iface, router_state,
 363                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 364 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 365                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 366 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 367 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 368 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 369                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 370 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 371 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 372                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 373 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 374                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 375 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 376                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 377 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 378                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 379 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 380                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 381
 382 /* common read only iface attribute */
 383 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 384 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 385 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 386 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 387 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 388 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 389 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 390 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 391 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 392                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 393 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 394 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 395 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 396 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 397 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 398 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 399
 400 /* common iscsi specific settings attributes */
 401 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 402 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 403 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 404 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 405 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 406 iscsi_iface_attr(iface, data_seq_in_order,
 407                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 408 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 409 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 410 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 411 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 412 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 413 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 414 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 415 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 416 iscsi_iface_attr(iface, discovery_auth_optional,
 417                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 418 iscsi_iface_attr(iface, discovery_logout,
 419                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 420 iscsi_iface_attr(iface, strict_login_comp_en,
 421                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 422 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 423
 424 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 425                                           struct attribute *attr, int i)
 426 {
 427         struct device *dev = container_of(kobj, struct device, kobj);
 428         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 429         struct iscsi_transport *t = iface->transport;
 430         int param = -1;
 431
 432         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 433                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 434         else if (attr == &dev_attr_iface_header_digest.attr)
 435                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 436         else if (attr == &dev_attr_iface_data_digest.attr)
 437                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 438         else if (attr == &dev_attr_iface_immediate_data.attr)
 439                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 440         else if (attr == &dev_attr_iface_initial_r2t.attr)
 441                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 442         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 443                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 444         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 445                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 446         else if (attr == &dev_attr_iface_erl.attr)
 447                 param = ISCSI_IFACE_PARAM_ERL;
 448         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 449                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 450         else if (attr == &dev_attr_iface_first_burst_len.attr)
 451                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 452         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 453                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 454         else if (attr == &dev_attr_iface_max_burst_len.attr)
 455                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 456         else if (attr == &dev_attr_iface_chap_auth.attr)
 457                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 458         else if (attr == &dev_attr_iface_bidi_chap.attr)
 459                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 460         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 461                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 462         else if (attr == &dev_attr_iface_discovery_logout.attr)
 463                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 464         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 465                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 466         else if (attr == &dev_attr_iface_initiator_name.attr)
 467                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 468
 469         if (param != -1)
 470                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 471
 472         if (attr == &dev_attr_iface_enabled.attr)
 473                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 474         else if (attr == &dev_attr_iface_vlan_id.attr)
 475                 param = ISCSI_NET_PARAM_VLAN_ID;
 476         else if (attr == &dev_attr_iface_vlan_priority.attr)
 477                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 478         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 479                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 480         else if (attr == &dev_attr_iface_mtu.attr)
 481                 param = ISCSI_NET_PARAM_MTU;
 482         else if (attr == &dev_attr_iface_port.attr)
 483                 param = ISCSI_NET_PARAM_PORT;
 484         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 485                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 486         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 487                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 488         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 489                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 490         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 491                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 492         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 493                 param = ISCSI_NET_PARAM_TCP_WSF;
 494         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 495                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 496         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 497                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 498         else if (attr == &dev_attr_iface_cache_id.attr)
 499                 param = ISCSI_NET_PARAM_CACHE_ID;
 500         else if (attr == &dev_attr_iface_redirect_en.attr)
 501                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 502         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 503                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 505                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 506                         param = ISCSI_NET_PARAM_IPV4_GW;
 507                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 508                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 509                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 510                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 511                 else if (attr ==
 512                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 513                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 514                 else if (attr ==
 515                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 517                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 519                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_TOS;
 521                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 522                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 523                 else if (attr ==
 524                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 526                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 528                 else if (attr ==
 529                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 531                 else if (attr ==
 532                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 534                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 536                 else if (attr ==
 537                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 538                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 539                 else if (attr ==
 540                          &dev_attr_ipv4_iface_fragment_disable.attr)
 541                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 542                 else if (attr ==
 543                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 545                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 546                         param = ISCSI_NET_PARAM_IPV4_TTL;
 547                 else
 548                         return 0;
 549         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 550                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 551                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 552                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 553                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 554                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 555                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 556                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 558                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 560                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 562                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 564                 else if (attr ==
 565                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 566                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 567                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 569                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 571                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 573                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 575                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 577                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 579                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 581                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 583                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 584                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 585                 else
 586                         return 0;
 587         } else {
 588                 WARN_ONCE(1, "Invalid iface attr");
 589                 return 0;
 590         }
 591
 592         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 593 }
 594
 595 static struct attribute *iscsi_iface_attrs[] = {
 596         &dev_attr_iface_enabled.attr,
 597         &dev_attr_iface_vlan_id.attr,
 598         &dev_attr_iface_vlan_priority.attr,
 599         &dev_attr_iface_vlan_enabled.attr,
 600         &dev_attr_ipv4_iface_ipaddress.attr,
 601         &dev_attr_ipv4_iface_gateway.attr,
 602         &dev_attr_ipv4_iface_subnet.attr,
 603         &dev_attr_ipv4_iface_bootproto.attr,
 604         &dev_attr_ipv6_iface_ipaddress.attr,
 605         &dev_attr_ipv6_iface_link_local_addr.attr,
 606         &dev_attr_ipv6_iface_router_addr.attr,
 607         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 608         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 609         &dev_attr_iface_mtu.attr,
 610         &dev_attr_iface_port.attr,
 611         &dev_attr_iface_ipaddress_state.attr,
 612         &dev_attr_iface_delayed_ack_en.attr,
 613         &dev_attr_iface_tcp_nagle_disable.attr,
 614         &dev_attr_iface_tcp_wsf_disable.attr,
 615         &dev_attr_iface_tcp_wsf.attr,
 616         &dev_attr_iface_tcp_timer_scale.attr,
 617         &dev_attr_iface_tcp_timestamp_en.attr,
 618         &dev_attr_iface_cache_id.attr,
 619         &dev_attr_iface_redirect_en.attr,
 620         &dev_attr_iface_def_taskmgmt_tmo.attr,
 621         &dev_attr_iface_header_digest.attr,
 622         &dev_attr_iface_data_digest.attr,
 623         &dev_attr_iface_immediate_data.attr,
 624         &dev_attr_iface_initial_r2t.attr,
 625         &dev_attr_iface_data_seq_in_order.attr,
 626         &dev_attr_iface_data_pdu_in_order.attr,
 627         &dev_attr_iface_erl.attr,
 628         &dev_attr_iface_max_recv_dlength.attr,
 629         &dev_attr_iface_first_burst_len.attr,
 630         &dev_attr_iface_max_outstanding_r2t.attr,
 631         &dev_attr_iface_max_burst_len.attr,
 632         &dev_attr_iface_chap_auth.attr,
 633         &dev_attr_iface_bidi_chap.attr,
 634         &dev_attr_iface_discovery_auth_optional.attr,
 635         &dev_attr_iface_discovery_logout.attr,
 636         &dev_attr_iface_strict_login_comp_en.attr,
 637         &dev_attr_iface_initiator_name.attr,
 638         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 639         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 640         &dev_attr_ipv4_iface_tos_en.attr,
 641         &dev_attr_ipv4_iface_tos.attr,
 642         &dev_attr_ipv4_iface_grat_arp_en.attr,
 643         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 644         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 645         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 646         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 647         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 648         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 649         &dev_attr_ipv4_iface_fragment_disable.attr,
 650         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 651         &dev_attr_ipv4_iface_ttl.attr,
 652         &dev_attr_ipv6_iface_link_local_state.attr,
 653         &dev_attr_ipv6_iface_router_state.attr,
 654         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 655         &dev_attr_ipv6_iface_mld_en.attr,
 656         &dev_attr_ipv6_iface_flow_label.attr,
 657         &dev_attr_ipv6_iface_traffic_class.attr,
 658         &dev_attr_ipv6_iface_hop_limit.attr,
 659         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 660         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 661         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 662         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 663         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 664         NULL,
 665 };
 666
 667 static struct attribute_group iscsi_iface_group = {
 668         .attrs = iscsi_iface_attrs,
 669         .is_visible = iscsi_iface_attr_is_visible,
 670 };
 671
 672 /* convert iscsi_ipaddress_state values to ascii string name */
 673 static const struct {
 674         enum iscsi_ipaddress_state      value;
 675         char                            *name;
 676 } iscsi_ipaddress_state_names[] = {
 677         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 678         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 679         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 680         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 681         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 682         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 683         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 684 };
 685
 686 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 687 {
 688         int i;
 689         char *state = NULL;
 690
 691         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 692                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 693                         state = iscsi_ipaddress_state_names[i].name;
 694                         break;
 695                 }
 696         }
 697         return state;
 698 }
 699 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 700
 701 /* convert iscsi_router_state values to ascii string name */
 702 static const struct {
 703         enum iscsi_router_state value;
 704         char                    *name;
 705 } iscsi_router_state_names[] = {
 706         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 707         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 708         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 709         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 710 };
 711
 712 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 713 {
 714         int i;
 715         char *state = NULL;
 716
 717         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 718                 if (iscsi_router_state_names[i].value == router_state) {
 719                         state = iscsi_router_state_names[i].name;
 720                         break;
 721                 }
 722         }
 723         return state;
 724 }
 725 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 726
 727 struct iscsi_iface *
 728 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 729                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 730 {
 731         struct iscsi_iface *iface;
 732         int err;
 733
 734         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 735         if (!iface)
 736                 return NULL;
 737
 738         iface->transport = transport;
 739         iface->iface_type = iface_type;
 740         iface->iface_num = iface_num;
 741         iface->dev.release = iscsi_iface_release;
 742         iface->dev.class = &iscsi_iface_class;
 743         /* parent reference released in iscsi_iface_release */
 744         iface->dev.parent = get_device(&shost->shost_gendev);
 745         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 746                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 747                              iface_num);
 748         else
 749                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 750                              iface_num);
 751
 752         err = device_register(&iface->dev);
 753         if (err)
 754                 goto free_iface;
 755
 756         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 757         if (err)
 758                 goto unreg_iface;
 759
 760         if (dd_size)
 761                 iface->dd_data = &iface[1];
 762         return iface;
 763
 764 unreg_iface:
 765         device_unregister(&iface->dev);
 766         return NULL;
 767
 768 free_iface:
 769         put_device(iface->dev.parent);
 770         kfree(iface);
 771         return NULL;
 772 }
 773 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 774
 775 void iscsi_destroy_iface(struct iscsi_iface *iface)
 776 {
 777         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 778         device_unregister(&iface->dev);
 779 }
 780 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 781
 782 /*
 783  * Interface to display flash node params to sysfs
 784  */
 785
 786 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 787 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 788         __ATTR(_name, _mode, _show, _store)
 789
 790 /* flash node session attrs show */
 791 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 792 static ssize_t                                                          \
 793 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 794                      char *buf)                                         \
 795 {                                                                       \
 796         struct iscsi_bus_flash_session *fnode_sess =                    \
 797                                         iscsi_dev_to_flash_session(dev);\
 798         struct iscsi_transport *t = fnode_sess->transport;              \
 799         return t->get_flashnode_param(fnode_sess, param, buf);          \
 800 }                                                                       \
 801
 802
 803 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 804         iscsi_flashnode_sess_attr_show(type, name, param)               \
 805 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 806                             show_##type##_##name, NULL);
 807
 808 /* Flash node session attributes */
 809
 810 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 811                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 812 iscsi_flashnode_sess_attr(fnode, discovery_session,
 813                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 814 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 815 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 816 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 817 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 818 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 819                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 820 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 821                           ISCSI_FLASHNODE_PDU_INORDER);
 822 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 823 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 824                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 825 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 826 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 827                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 828 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 829 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 830 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 831 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 832                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 833 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 834 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 835 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 836 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 837 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 838                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 839 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 840 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 841 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 842 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 843                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 844 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 845                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 846 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 847 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 848 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 849 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 850 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 851 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 852 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 853
 854 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 855         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 856         &dev_attr_fnode_discovery_session.attr,
 857         &dev_attr_fnode_portal_type.attr,
 858         &dev_attr_fnode_entry_enable.attr,
 859         &dev_attr_fnode_immediate_data.attr,
 860         &dev_attr_fnode_initial_r2t.attr,
 861         &dev_attr_fnode_data_seq_in_order.attr,
 862         &dev_attr_fnode_data_pdu_in_order.attr,
 863         &dev_attr_fnode_chap_auth.attr,
 864         &dev_attr_fnode_discovery_logout.attr,
 865         &dev_attr_fnode_bidi_chap.attr,
 866         &dev_attr_fnode_discovery_auth_optional.attr,
 867         &dev_attr_fnode_erl.attr,
 868         &dev_attr_fnode_first_burst_len.attr,
 869         &dev_attr_fnode_def_time2wait.attr,
 870         &dev_attr_fnode_def_time2retain.attr,
 871         &dev_attr_fnode_max_outstanding_r2t.attr,
 872         &dev_attr_fnode_isid.attr,
 873         &dev_attr_fnode_tsid.attr,
 874         &dev_attr_fnode_max_burst_len.attr,
 875         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 876         &dev_attr_fnode_targetalias.attr,
 877         &dev_attr_fnode_targetname.attr,
 878         &dev_attr_fnode_tpgt.attr,
 879         &dev_attr_fnode_discovery_parent_idx.attr,
 880         &dev_attr_fnode_discovery_parent_type.attr,
 881         &dev_attr_fnode_chap_in_idx.attr,
 882         &dev_attr_fnode_chap_out_idx.attr,
 883         &dev_attr_fnode_username.attr,
 884         &dev_attr_fnode_username_in.attr,
 885         &dev_attr_fnode_password.attr,
 886         &dev_attr_fnode_password_in.attr,
 887         &dev_attr_fnode_is_boot_target.attr,
 888         NULL,
 889 };
 890
 891 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 892                                                     struct attribute *attr,
 893                                                     int i)
 894 {
 895         struct device *dev = container_of(kobj, struct device, kobj);
 896         struct iscsi_bus_flash_session *fnode_sess =
 897                                                 iscsi_dev_to_flash_session(dev);
 898         struct iscsi_transport *t = fnode_sess->transport;
 899         int param;
 900
 901         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 902                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 903         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 904                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 905         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 906                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 907         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 908                 param = ISCSI_FLASHNODE_ENTRY_EN;
 909         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 910                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 911         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 912                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 913         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 914                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 915         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 916                 param = ISCSI_FLASHNODE_PDU_INORDER;
 917         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 918                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 919         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 921         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 922                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 923         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 924                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 925         } else if (attr == &dev_attr_fnode_erl.attr) {
 926                 param = ISCSI_FLASHNODE_ERL;
 927         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 928                 param = ISCSI_FLASHNODE_FIRST_BURST;
 929         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 930                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 931         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 932                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 933         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 934                 param = ISCSI_FLASHNODE_MAX_R2T;
 935         } else if (attr == &dev_attr_fnode_isid.attr) {
 936                 param = ISCSI_FLASHNODE_ISID;
 937         } else if (attr == &dev_attr_fnode_tsid.attr) {
 938                 param = ISCSI_FLASHNODE_TSID;
 939         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 940                 param = ISCSI_FLASHNODE_MAX_BURST;
 941         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 942                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 943         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 944                 param = ISCSI_FLASHNODE_ALIAS;
 945         } else if (attr == &dev_attr_fnode_targetname.attr) {
 946                 param = ISCSI_FLASHNODE_NAME;
 947         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 948                 param = ISCSI_FLASHNODE_TPGT;
 949         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 950                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 951         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 952                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 953         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 954                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 955         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 956                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 957         } else if (attr == &dev_attr_fnode_username.attr) {
 958                 param = ISCSI_FLASHNODE_USERNAME;
 959         } else if (attr == &dev_attr_fnode_username_in.attr) {
 960                 param = ISCSI_FLASHNODE_USERNAME_IN;
 961         } else if (attr == &dev_attr_fnode_password.attr) {
 962                 param = ISCSI_FLASHNODE_PASSWORD;
 963         } else if (attr == &dev_attr_fnode_password_in.attr) {
 964                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 965         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 966                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 967         } else {
 968                 WARN_ONCE(1, "Invalid flashnode session attr");
 969                 return 0;
 970         }
 971
 972         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 973 }
 974
 975 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 976         .attrs = iscsi_flashnode_sess_attrs,
 977         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 978 };
 979
 980 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 981         &iscsi_flashnode_sess_attr_group,
 982         NULL,
 983 };
 984
 985 static void iscsi_flashnode_sess_release(struct device *dev)
 986 {
 987         struct iscsi_bus_flash_session *fnode_sess =
 988                                                 iscsi_dev_to_flash_session(dev);
 989
 990         kfree(fnode_sess->targetname);
 991         kfree(fnode_sess->targetalias);
 992         kfree(fnode_sess->portal_type);
 993         kfree(fnode_sess);
 994 }
 995
 996 static const struct device_type iscsi_flashnode_sess_dev_type = {
 997         .name = "iscsi_flashnode_sess_dev_type",
 998         .groups = iscsi_flashnode_sess_attr_groups,
 999         .release = iscsi_flashnode_sess_release,
1000 };
1001
1002 /* flash node connection attrs show */
1003 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1004 static ssize_t                                                          \
1005 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1006                      char *buf)                                         \
1007 {                                                                       \
1008         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1009         struct iscsi_bus_flash_session *fnode_sess =                    \
1010                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1011         struct iscsi_transport *t = fnode_conn->transport;              \
1012         return t->get_flashnode_param(fnode_sess, param, buf);          \
1013 }                                                                       \
1014
1015
1016 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1017         iscsi_flashnode_conn_attr_show(type, name, param)               \
1018 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1019                             show_##type##_##name, NULL);
1020
1021 /* Flash node connection attributes */
1022
1023 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1024                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1025 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1026 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1027 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1028 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1029                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1030 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1031                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1032 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1033                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1034 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1035                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1036 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1037                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1038 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1039                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1040 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1041 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1042 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1043 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1044                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1045 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1046                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1047 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1048 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1049 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1050 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1051                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1052 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1053                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1054 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1055                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1056 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1057                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1058 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1059 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1060 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1061 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1062
1063 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1064         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1065         &dev_attr_fnode_header_digest.attr,
1066         &dev_attr_fnode_data_digest.attr,
1067         &dev_attr_fnode_snack_req.attr,
1068         &dev_attr_fnode_tcp_timestamp_stat.attr,
1069         &dev_attr_fnode_tcp_nagle_disable.attr,
1070         &dev_attr_fnode_tcp_wsf_disable.attr,
1071         &dev_attr_fnode_tcp_timer_scale.attr,
1072         &dev_attr_fnode_tcp_timestamp_enable.attr,
1073         &dev_attr_fnode_fragment_disable.attr,
1074         &dev_attr_fnode_max_recv_dlength.attr,
1075         &dev_attr_fnode_max_xmit_dlength.attr,
1076         &dev_attr_fnode_keepalive_tmo.attr,
1077         &dev_attr_fnode_port.attr,
1078         &dev_attr_fnode_ipaddress.attr,
1079         &dev_attr_fnode_redirect_ipaddr.attr,
1080         &dev_attr_fnode_max_segment_size.attr,
1081         &dev_attr_fnode_local_port.attr,
1082         &dev_attr_fnode_ipv4_tos.attr,
1083         &dev_attr_fnode_ipv6_traffic_class.attr,
1084         &dev_attr_fnode_ipv6_flow_label.attr,
1085         &dev_attr_fnode_link_local_ipv6.attr,
1086         &dev_attr_fnode_tcp_xmit_wsf.attr,
1087         &dev_attr_fnode_tcp_recv_wsf.attr,
1088         &dev_attr_fnode_statsn.attr,
1089         &dev_attr_fnode_exp_statsn.attr,
1090         NULL,
1091 };
1092
1093 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1094                                                     struct attribute *attr,
1095                                                     int i)
1096 {
1097         struct device *dev = container_of(kobj, struct device, kobj);
1098         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1099         struct iscsi_transport *t = fnode_conn->transport;
1100         int param;
1101
1102         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1103                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1104         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1105                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1106         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1107                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1108         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1109                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1110         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1111                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1112         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1113                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1114         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1115                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1116         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1117                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1118         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1119                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1120         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1121                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1122         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1123                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1124         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1125                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1126         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1127                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1128         } else if (attr == &dev_attr_fnode_port.attr) {
1129                 param = ISCSI_FLASHNODE_PORT;
1130         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1131                 param = ISCSI_FLASHNODE_IPADDR;
1132         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1133                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1134         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1135                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1136         } else if (attr == &dev_attr_fnode_local_port.attr) {
1137                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1138         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1139                 param = ISCSI_FLASHNODE_IPV4_TOS;
1140         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1141                 param = ISCSI_FLASHNODE_IPV6_TC;
1142         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1143                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1144         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1145                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1146         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1147                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1148         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1149                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1150         } else if (attr == &dev_attr_fnode_statsn.attr) {
1151                 param = ISCSI_FLASHNODE_STATSN;
1152         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1153                 param = ISCSI_FLASHNODE_EXP_STATSN;
1154         } else {
1155                 WARN_ONCE(1, "Invalid flashnode connection attr");
1156                 return 0;
1157         }
1158
1159         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1160 }
1161
1162 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1163         .attrs = iscsi_flashnode_conn_attrs,
1164         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1165 };
1166
1167 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1168         &iscsi_flashnode_conn_attr_group,
1169         NULL,
1170 };
1171
1172 static void iscsi_flashnode_conn_release(struct device *dev)
1173 {
1174         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1175
1176         kfree(fnode_conn->ipaddress);
1177         kfree(fnode_conn->redirect_ipaddr);
1178         kfree(fnode_conn->link_local_ipv6_addr);
1179         kfree(fnode_conn);
1180 }
1181
1182 static const struct device_type iscsi_flashnode_conn_dev_type = {
1183         .name = "iscsi_flashnode_conn_dev_type",
1184         .groups = iscsi_flashnode_conn_attr_groups,
1185         .release = iscsi_flashnode_conn_release,
1186 };
1187
1188 static struct bus_type iscsi_flashnode_bus;
1189
1190 int iscsi_flashnode_bus_match(struct device *dev,
1191                                      struct device_driver *drv)
1192 {
1193         if (dev->bus == &iscsi_flashnode_bus)
1194                 return 1;
1195         return 0;
1196 }
1197 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1198
1199 static struct bus_type iscsi_flashnode_bus = {
1200         .name = "iscsi_flashnode",
1201         .match = &iscsi_flashnode_bus_match,
1202 };
1203
1204 /**
1205  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1206  * @shost: pointer to host data
1207  * @index: index of flashnode to add in sysfs
1208  * @transport: pointer to transport data
1209  * @dd_size: total size to allocate
1210  *
1211  * Adds a sysfs entry for the flashnode session attributes
1212  *
1213  * Returns:
1214  *  pointer to allocated flashnode sess on success
1215  *  %NULL on failure
1216  */
1217 struct iscsi_bus_flash_session *
1218 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1219                             struct iscsi_transport *transport,
1220                             int dd_size)
1221 {
1222         struct iscsi_bus_flash_session *fnode_sess;
1223         int err;
1224
1225         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1226         if (!fnode_sess)
1227                 return NULL;
1228
1229         fnode_sess->transport = transport;
1230         fnode_sess->target_id = index;
1231         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1232         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1233         fnode_sess->dev.parent = &shost->shost_gendev;
1234         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1235                      shost->host_no, index);
1236
1237         err = device_register(&fnode_sess->dev);
1238         if (err)
1239                 goto free_fnode_sess;
1240
1241         if (dd_size)
1242                 fnode_sess->dd_data = &fnode_sess[1];
1243
1244         return fnode_sess;
1245
1246 free_fnode_sess:
1247         kfree(fnode_sess);
1248         return NULL;
1249 }
1250 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1251
1252 /**
1253  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1254  * @shost: pointer to host data
1255  * @fnode_sess: pointer to the parent flashnode session entry
1256  * @transport: pointer to transport data
1257  * @dd_size: total size to allocate
1258  *
1259  * Adds a sysfs entry for the flashnode connection attributes
1260  *
1261  * Returns:
1262  *  pointer to allocated flashnode conn on success
1263  *  %NULL on failure
1264  */
1265 struct iscsi_bus_flash_conn *
1266 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1267                             struct iscsi_bus_flash_session *fnode_sess,
1268                             struct iscsi_transport *transport,
1269                             int dd_size)
1270 {
1271         struct iscsi_bus_flash_conn *fnode_conn;
1272         int err;
1273
1274         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1275         if (!fnode_conn)
1276                 return NULL;
1277
1278         fnode_conn->transport = transport;
1279         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1280         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1281         fnode_conn->dev.parent = &fnode_sess->dev;
1282         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1283                      shost->host_no, fnode_sess->target_id);
1284
1285         err = device_register(&fnode_conn->dev);
1286         if (err)
1287                 goto free_fnode_conn;
1288
1289         if (dd_size)
1290                 fnode_conn->dd_data = &fnode_conn[1];
1291
1292         return fnode_conn;
1293
1294 free_fnode_conn:
1295         kfree(fnode_conn);
1296         return NULL;
1297 }
1298 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1299
1300 /**
1301  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1302  * @dev: device to verify
1303  * @data: pointer to data containing value to use for verification
1304  *
1305  * Verifies if the passed device is flashnode conn device
1306  *
1307  * Returns:
1308  *  1 on success
1309  *  0 on failure
1310  */
1311 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1312 {
1313         return dev->bus == &iscsi_flashnode_bus;
1314 }
1315
1316 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1317 {
1318         device_unregister(&fnode_conn->dev);
1319         return 0;
1320 }
1321
1322 static int flashnode_match_index(struct device *dev, void *data)
1323 {
1324         struct iscsi_bus_flash_session *fnode_sess = NULL;
1325         int ret = 0;
1326
1327         if (!iscsi_flashnode_bus_match(dev, NULL))
1328                 goto exit_match_index;
1329
1330         fnode_sess = iscsi_dev_to_flash_session(dev);
1331         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1332
1333 exit_match_index:
1334         return ret;
1335 }
1336
1337 /**
1338  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1339  * @shost: pointer to host data
1340  * @idx: index to match
1341  *
1342  * Finds the flashnode session object for the passed index
1343  *
1344  * Returns:
1345  *  pointer to found flashnode session object on success
1346  *  %NULL on failure
1347  */
1348 static struct iscsi_bus_flash_session *
1349 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1350 {
1351         struct iscsi_bus_flash_session *fnode_sess = NULL;
1352         struct device *dev;
1353
1354         dev = device_find_child(&shost->shost_gendev, &idx,
1355                                 flashnode_match_index);
1356         if (dev)
1357                 fnode_sess = iscsi_dev_to_flash_session(dev);
1358
1359         return fnode_sess;
1360 }
1361
1362 /**
1363  * iscsi_find_flashnode_sess - finds flashnode session entry
1364  * @shost: pointer to host data
1365  * @data: pointer to data containing value to use for comparison
1366  * @fn: function pointer that does actual comparison
1367  *
1368  * Finds the flashnode session object comparing the data passed using logic
1369  * defined in passed function pointer
1370  *
1371  * Returns:
1372  *  pointer to found flashnode session device object on success
1373  *  %NULL on failure
1374  */
1375 struct device *
1376 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1377                           int (*fn)(struct device *dev, void *data))
1378 {
1379         return device_find_child(&shost->shost_gendev, data, fn);
1380 }
1381 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1382
1383 /**
1384  * iscsi_find_flashnode_conn - finds flashnode connection entry
1385  * @fnode_sess: pointer to parent flashnode session entry
1386  *
1387  * Finds the flashnode connection object comparing the data passed using logic
1388  * defined in passed function pointer
1389  *
1390  * Returns:
1391  *  pointer to found flashnode connection device object on success
1392  *  %NULL on failure
1393  */
1394 struct device *
1395 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1396 {
1397         return device_find_child(&fnode_sess->dev, NULL,
1398                                  iscsi_is_flashnode_conn_dev);
1399 }
1400 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1401
1402 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1403 {
1404         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1405                 return 0;
1406
1407         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1408 }
1409
1410 /**
1411  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1412  * @fnode_sess: pointer to flashnode session entry to be destroyed
1413  *
1414  * Deletes the flashnode session entry and all children flashnode connection
1415  * entries from sysfs
1416  */
1417 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1418 {
1419         int err;
1420
1421         err = device_for_each_child(&fnode_sess->dev, NULL,
1422                                     iscsi_iter_destroy_flashnode_conn_fn);
1423         if (err)
1424                 pr_err("Could not delete all connections for %s. Error %d.\n",
1425                        fnode_sess->dev.kobj.name, err);
1426
1427         device_unregister(&fnode_sess->dev);
1428 }
1429 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1430
1431 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1432 {
1433         if (!iscsi_flashnode_bus_match(dev, NULL))
1434                 return 0;
1435
1436         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1437         return 0;
1438 }
1439
1440 /**
1441  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1442  * @shost: pointer to host data
1443  *
1444  * Destroys all the flashnode session entries and all corresponding children
1445  * flashnode connection entries from sysfs
1446  */
1447 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1448 {
1449         device_for_each_child(&shost->shost_gendev, NULL,
1450                               iscsi_iter_destroy_flashnode_fn);
1451 }
1452 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1453
1454 /*
1455  * BSG support
1456  */
1457 /**
1458  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1459  * @job: bsg job to be processed
1460  */
1461 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1462 {
1463         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1464         struct iscsi_bsg_request *req = job->request;
1465         struct iscsi_bsg_reply *reply = job->reply;
1466         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1467         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1468         int ret;
1469
1470         /* check if we have the msgcode value at least */
1471         if (job->request_len < sizeof(uint32_t)) {
1472                 ret = -ENOMSG;
1473                 goto fail_host_msg;
1474         }
1475
1476         /* Validate the host command */
1477         switch (req->msgcode) {
1478         case ISCSI_BSG_HST_VENDOR:
1479                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1480                 if ((shost->hostt->vendor_id == 0L) ||
1481                     (req->rqst_data.h_vendor.vendor_id !=
1482                         shost->hostt->vendor_id)) {
1483                         ret = -ESRCH;
1484                         goto fail_host_msg;
1485                 }
1486                 break;
1487         default:
1488                 ret = -EBADR;
1489                 goto fail_host_msg;
1490         }
1491
1492         /* check if we really have all the request data needed */
1493         if (job->request_len < cmdlen) {
1494                 ret = -ENOMSG;
1495                 goto fail_host_msg;
1496         }
1497
1498         ret = i->iscsi_transport->bsg_request(job);
1499         if (!ret)
1500                 return 0;
1501
1502 fail_host_msg:
1503         /* return the errno failure code as the only status */
1504         BUG_ON(job->reply_len < sizeof(uint32_t));
1505         reply->reply_payload_rcv_len = 0;
1506         reply->result = ret;
1507         job->reply_len = sizeof(uint32_t);
1508         bsg_job_done(job, ret, 0);
1509         return 0;
1510 }
1511
1512 /**
1513  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1514  * @shost: shost for iscsi_host
1515  * @ihost: iscsi_cls_host adding the structures to
1516  */
1517 static int
1518 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1519 {
1520         struct device *dev = &shost->shost_gendev;
1521         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1522         struct request_queue *q;
1523         char bsg_name[20];
1524
1525         if (!i->iscsi_transport->bsg_request)
1526                 return -ENOTSUPP;
1527
1528         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1529         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, 0, NULL);
1530         if (IS_ERR(q)) {
1531                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1532                              "initialize - no request queue\n");
1533                 return PTR_ERR(q);
1534         }
1535         __scsi_init_queue(shost, q);
1536
1537         ihost->bsg_q = q;
1538         return 0;
1539 }
1540
1541 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1542                             struct device *cdev)
1543 {
1544         struct Scsi_Host *shost = dev_to_shost(dev);
1545         struct iscsi_cls_host *ihost = shost->shost_data;
1546
1547         memset(ihost, 0, sizeof(*ihost));
1548         atomic_set(&ihost->nr_scans, 0);
1549         mutex_init(&ihost->mutex);
1550
1551         iscsi_bsg_host_add(shost, ihost);
1552         /* ignore any bsg add error - we just can't do sgio */
1553
1554         return 0;
1555 }
1556
1557 static int iscsi_remove_host(struct transport_container *tc,
1558                              struct device *dev, struct device *cdev)
1559 {
1560         struct Scsi_Host *shost = dev_to_shost(dev);
1561         struct iscsi_cls_host *ihost = shost->shost_data;
1562
1563         if (ihost->bsg_q) {
1564                 bsg_unregister_queue(ihost->bsg_q);
1565                 blk_cleanup_queue(ihost->bsg_q);
1566         }
1567         return 0;
1568 }
1569
1570 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1571                                "iscsi_host",
1572                                iscsi_setup_host,
1573                                iscsi_remove_host,
1574                                NULL);
1575
1576 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1577                                "iscsi_session",
1578                                NULL,
1579                                NULL,
1580                                NULL);
1581
1582 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1583                                "iscsi_connection",
1584                                NULL,
1585                                NULL,
1586                                NULL);
1587
1588 static struct sock *nls;
1589 static DEFINE_MUTEX(rx_queue_mutex);
1590
1591 static LIST_HEAD(sesslist);
1592 static DEFINE_SPINLOCK(sesslock);
1593 static LIST_HEAD(connlist);
1594 static DEFINE_SPINLOCK(connlock);
1595
1596 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1597 {
1598         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1599         return sess->sid;
1600 }
1601
1602 /*
1603  * Returns the matching session to a given sid
1604  */
1605 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1606 {
1607         unsigned long flags;
1608         struct iscsi_cls_session *sess;
1609
1610         spin_lock_irqsave(&sesslock, flags);
1611         list_for_each_entry(sess, &sesslist, sess_list) {
1612                 if (sess->sid == sid) {
1613                         spin_unlock_irqrestore(&sesslock, flags);
1614                         return sess;
1615                 }
1616         }
1617         spin_unlock_irqrestore(&sesslock, flags);
1618         return NULL;
1619 }
1620
1621 /*
1622  * Returns the matching connection to a given sid / cid tuple
1623  */
1624 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1625 {
1626         unsigned long flags;
1627         struct iscsi_cls_conn *conn;
1628
1629         spin_lock_irqsave(&connlock, flags);
1630         list_for_each_entry(conn, &connlist, conn_list) {
1631                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1632                         spin_unlock_irqrestore(&connlock, flags);
1633                         return conn;
1634                 }
1635         }
1636         spin_unlock_irqrestore(&connlock, flags);
1637         return NULL;
1638 }
1639
1640 /*
1641  * The following functions can be used by LLDs that allocate
1642  * their own scsi_hosts or by software iscsi LLDs
1643  */
1644 static struct {
1645         int value;
1646         char *name;
1647 } iscsi_session_state_names[] = {
1648         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1649         { ISCSI_SESSION_FAILED,         "FAILED" },
1650         { ISCSI_SESSION_FREE,           "FREE" },
1651 };
1652
1653 static const char *iscsi_session_state_name(int state)
1654 {
1655         int i;
1656         char *name = NULL;
1657
1658         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1659                 if (iscsi_session_state_names[i].value == state) {
1660                         name = iscsi_session_state_names[i].name;
1661                         break;
1662                 }
1663         }
1664         return name;
1665 }
1666
1667 int iscsi_session_chkready(struct iscsi_cls_session *session)
1668 {
1669         unsigned long flags;
1670         int err;
1671
1672         spin_lock_irqsave(&session->lock, flags);
1673         switch (session->state) {
1674         case ISCSI_SESSION_LOGGED_IN:
1675                 err = 0;
1676                 break;
1677         case ISCSI_SESSION_FAILED:
1678                 err = DID_IMM_RETRY << 16;
1679                 break;
1680         case ISCSI_SESSION_FREE:
1681                 err = DID_TRANSPORT_FAILFAST << 16;
1682                 break;
1683         default:
1684                 err = DID_NO_CONNECT << 16;
1685                 break;
1686         }
1687         spin_unlock_irqrestore(&session->lock, flags);
1688         return err;
1689 }
1690 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1691
1692 int iscsi_is_session_online(struct iscsi_cls_session *session)
1693 {
1694         unsigned long flags;
1695         int ret = 0;
1696
1697         spin_lock_irqsave(&session->lock, flags);
1698         if (session->state == ISCSI_SESSION_LOGGED_IN)
1699                 ret = 1;
1700         spin_unlock_irqrestore(&session->lock, flags);
1701         return ret;
1702 }
1703 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1704
1705 static void iscsi_session_release(struct device *dev)
1706 {
1707         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1708         struct Scsi_Host *shost;
1709
1710         shost = iscsi_session_to_shost(session);
1711         scsi_host_put(shost);
1712         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1713         kfree(session);
1714 }
1715
1716 int iscsi_is_session_dev(const struct device *dev)
1717 {
1718         return dev->release == iscsi_session_release;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1721
1722 static int iscsi_iter_session_fn(struct device *dev, void *data)
1723 {
1724         void (* fn) (struct iscsi_cls_session *) = data;
1725
1726         if (!iscsi_is_session_dev(dev))
1727                 return 0;
1728         fn(iscsi_dev_to_session(dev));
1729         return 0;
1730 }
1731
1732 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1733                                  void (*fn)(struct iscsi_cls_session *))
1734 {
1735         device_for_each_child(&shost->shost_gendev, fn,
1736                               iscsi_iter_session_fn);
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1739
1740 /**
1741  * iscsi_scan_finished - helper to report when running scans are done
1742  * @shost: scsi host
1743  * @time: scan run time
1744  *
1745  * This function can be used by drives like qla4xxx to report to the scsi
1746  * layer when the scans it kicked off at module load time are done.
1747  */
1748 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1749 {
1750         struct iscsi_cls_host *ihost = shost->shost_data;
1751         /*
1752          * qla4xxx will have kicked off some session unblocks before calling
1753          * scsi_scan_host, so just wait for them to complete.
1754          */
1755         return !atomic_read(&ihost->nr_scans);
1756 }
1757 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1758
1759 struct iscsi_scan_data {
1760         unsigned int channel;
1761         unsigned int id;
1762         u64 lun;
1763         enum scsi_scan_mode rescan;
1764 };
1765
1766 static int iscsi_user_scan_session(struct device *dev, void *data)
1767 {
1768         struct iscsi_scan_data *scan_data = data;
1769         struct iscsi_cls_session *session;
1770         struct Scsi_Host *shost;
1771         struct iscsi_cls_host *ihost;
1772         unsigned long flags;
1773         unsigned int id;
1774
1775         if (!iscsi_is_session_dev(dev))
1776                 return 0;
1777
1778         session = iscsi_dev_to_session(dev);
1779
1780         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1781
1782         shost = iscsi_session_to_shost(session);
1783         ihost = shost->shost_data;
1784
1785         mutex_lock(&ihost->mutex);
1786         spin_lock_irqsave(&session->lock, flags);
1787         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1788                 spin_unlock_irqrestore(&session->lock, flags);
1789                 goto user_scan_exit;
1790         }
1791         id = session->target_id;
1792         spin_unlock_irqrestore(&session->lock, flags);
1793
1794         if (id != ISCSI_MAX_TARGET) {
1795                 if ((scan_data->channel == SCAN_WILD_CARD ||
1796                      scan_data->channel == 0) &&
1797                     (scan_data->id == SCAN_WILD_CARD ||
1798                      scan_data->id == id))
1799                         scsi_scan_target(&session->dev, 0, id,
1800                                          scan_data->lun, scan_data->rescan);
1801         }
1802
1803 user_scan_exit:
1804         mutex_unlock(&ihost->mutex);
1805         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1806         return 0;
1807 }
1808
1809 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1810                            uint id, u64 lun)
1811 {
1812         struct iscsi_scan_data scan_data;
1813
1814         scan_data.channel = channel;
1815         scan_data.id = id;
1816         scan_data.lun = lun;
1817         scan_data.rescan = SCSI_SCAN_MANUAL;
1818
1819         return device_for_each_child(&shost->shost_gendev, &scan_data,
1820                                      iscsi_user_scan_session);
1821 }
1822
1823 static void iscsi_scan_session(struct work_struct *work)
1824 {
1825         struct iscsi_cls_session *session =
1826                         container_of(work, struct iscsi_cls_session, scan_work);
1827         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1828         struct iscsi_cls_host *ihost = shost->shost_data;
1829         struct iscsi_scan_data scan_data;
1830
1831         scan_data.channel = 0;
1832         scan_data.id = SCAN_WILD_CARD;
1833         scan_data.lun = SCAN_WILD_CARD;
1834         scan_data.rescan = SCSI_SCAN_RESCAN;
1835
1836         iscsi_user_scan_session(&session->dev, &scan_data);
1837         atomic_dec(&ihost->nr_scans);
1838 }
1839
1840 /**
1841  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1842  * @cmd: scsi cmd passed to scsi eh handler
1843  *
1844  * If the session is down this function will wait for the recovery
1845  * timer to fire or for the session to be logged back in. If the
1846  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1847  * should pass this error value to the scsi eh.
1848  */
1849 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1850 {
1851         struct iscsi_cls_session *session =
1852                         starget_to_session(scsi_target(cmd->device));
1853         unsigned long flags;
1854         int ret = 0;
1855
1856         spin_lock_irqsave(&session->lock, flags);
1857         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1858                 if (session->state == ISCSI_SESSION_FREE) {
1859                         ret = FAST_IO_FAIL;
1860                         break;
1861                 }
1862                 spin_unlock_irqrestore(&session->lock, flags);
1863                 msleep(1000);
1864                 spin_lock_irqsave(&session->lock, flags);
1865         }
1866         spin_unlock_irqrestore(&session->lock, flags);
1867         return ret;
1868 }
1869 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1870
1871 static void session_recovery_timedout(struct work_struct *work)
1872 {
1873         struct iscsi_cls_session *session =
1874                 container_of(work, struct iscsi_cls_session,
1875                              recovery_work.work);
1876         unsigned long flags;
1877
1878         iscsi_cls_session_printk(KERN_INFO, session,
1879                                  "session recovery timed out after %d secs\n",
1880                                  session->recovery_tmo);
1881
1882         spin_lock_irqsave(&session->lock, flags);
1883         switch (session->state) {
1884         case ISCSI_SESSION_FAILED:
1885                 session->state = ISCSI_SESSION_FREE;
1886                 break;
1887         case ISCSI_SESSION_LOGGED_IN:
1888         case ISCSI_SESSION_FREE:
1889                 /* we raced with the unblock's flush */
1890                 spin_unlock_irqrestore(&session->lock, flags);
1891                 return;
1892         }
1893         spin_unlock_irqrestore(&session->lock, flags);
1894
1895         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1896         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1897         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1898
1899         if (session->transport->session_recovery_timedout)
1900                 session->transport->session_recovery_timedout(session);
1901 }
1902
1903 static void __iscsi_unblock_session(struct work_struct *work)
1904 {
1905         struct iscsi_cls_session *session =
1906                         container_of(work, struct iscsi_cls_session,
1907                                      unblock_work);
1908         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1909         struct iscsi_cls_host *ihost = shost->shost_data;
1910         unsigned long flags;
1911
1912         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1913         /*
1914          * The recovery and unblock work get run from the same workqueue,
1915          * so try to cancel it if it was going to run after this unblock.
1916          */
1917         cancel_delayed_work(&session->recovery_work);
1918         spin_lock_irqsave(&session->lock, flags);
1919         session->state = ISCSI_SESSION_LOGGED_IN;
1920         spin_unlock_irqrestore(&session->lock, flags);
1921         /* start IO */
1922         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1923         /*
1924          * Only do kernel scanning if the driver is properly hooked into
1925          * the async scanning code (drivers like iscsi_tcp do login and
1926          * scanning from userspace).
1927          */
1928         if (shost->hostt->scan_finished) {
1929                 if (scsi_queue_work(shost, &session->scan_work))
1930                         atomic_inc(&ihost->nr_scans);
1931         }
1932         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1933 }
1934
1935 /**
1936  * iscsi_unblock_session - set a session as logged in and start IO.
1937  * @session: iscsi session
1938  *
1939  * Mark a session as ready to accept IO.
1940  */
1941 void iscsi_unblock_session(struct iscsi_cls_session *session)
1942 {
1943         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1944         /*
1945          * make sure all the events have completed before tell the driver
1946          * it is safe
1947          */
1948         flush_workqueue(iscsi_eh_timer_workq);
1949 }
1950 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1951
1952 static void __iscsi_block_session(struct work_struct *work)
1953 {
1954         struct iscsi_cls_session *session =
1955                         container_of(work, struct iscsi_cls_session,
1956                                      block_work);
1957         unsigned long flags;
1958
1959         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1960         spin_lock_irqsave(&session->lock, flags);
1961         session->state = ISCSI_SESSION_FAILED;
1962         spin_unlock_irqrestore(&session->lock, flags);
1963         scsi_target_block(&session->dev);
1964         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1965         if (session->recovery_tmo >= 0)
1966                 queue_delayed_work(iscsi_eh_timer_workq,
1967                                    &session->recovery_work,
1968                                    session->recovery_tmo * HZ);
1969 }
1970
1971 void iscsi_block_session(struct iscsi_cls_session *session)
1972 {
1973         queue_work(iscsi_eh_timer_workq, &session->block_work);
1974 }
1975 EXPORT_SYMBOL_GPL(iscsi_block_session);
1976
1977 static void __iscsi_unbind_session(struct work_struct *work)
1978 {
1979         struct iscsi_cls_session *session =
1980                         container_of(work, struct iscsi_cls_session,
1981                                      unbind_work);
1982         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1983         struct iscsi_cls_host *ihost = shost->shost_data;
1984         unsigned long flags;
1985         unsigned int target_id;
1986
1987         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1988
1989         /* Prevent new scans and make sure scanning is not in progress */
1990         mutex_lock(&ihost->mutex);
1991         spin_lock_irqsave(&session->lock, flags);
1992         if (session->target_id == ISCSI_MAX_TARGET) {
1993                 spin_unlock_irqrestore(&session->lock, flags);
1994                 mutex_unlock(&ihost->mutex);
1995                 goto unbind_session_exit;
1996         }
1997
1998         target_id = session->target_id;
1999         session->target_id = ISCSI_MAX_TARGET;
2000         spin_unlock_irqrestore(&session->lock, flags);
2001         mutex_unlock(&ihost->mutex);
2002
2003         if (session->ida_used)
2004                 ida_simple_remove(&iscsi_sess_ida, target_id);
2005
2006         scsi_remove_target(&session->dev);
2007
2008 unbind_session_exit:
2009         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2010         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2011 }
2012
2013 struct iscsi_cls_session *
2014 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2015                     int dd_size)
2016 {
2017         struct iscsi_cls_session *session;
2018
2019         session = kzalloc(sizeof(*session) + dd_size,
2020                           GFP_KERNEL);
2021         if (!session)
2022                 return NULL;
2023
2024         session->transport = transport;
2025         session->creator = -1;
2026         session->recovery_tmo = 120;
2027         session->recovery_tmo_sysfs_override = false;
2028         session->state = ISCSI_SESSION_FREE;
2029         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2030         INIT_LIST_HEAD(&session->sess_list);
2031         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2032         INIT_WORK(&session->block_work, __iscsi_block_session);
2033         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2034         INIT_WORK(&session->scan_work, iscsi_scan_session);
2035         spin_lock_init(&session->lock);
2036
2037         /* this is released in the dev's release function */
2038         scsi_host_get(shost);
2039         session->dev.parent = &shost->shost_gendev;
2040         session->dev.release = iscsi_session_release;
2041         device_initialize(&session->dev);
2042         if (dd_size)
2043                 session->dd_data = &session[1];
2044
2045         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2046         return session;
2047 }
2048 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2049
2050 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2051 {
2052         unsigned long flags;
2053         int id = 0;
2054         int err;
2055
2056         session->sid = atomic_add_return(1, &iscsi_session_nr);
2057
2058         if (target_id == ISCSI_MAX_TARGET) {
2059                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2060
2061                 if (id < 0) {
2062                         iscsi_cls_session_printk(KERN_ERR, session,
2063                                         "Failure in Target ID Allocation\n");
2064                         return id;
2065                 }
2066                 session->target_id = (unsigned int)id;
2067                 session->ida_used = true;
2068         } else
2069                 session->target_id = target_id;
2070
2071         dev_set_name(&session->dev, "session%u", session->sid);
2072         err = device_add(&session->dev);
2073         if (err) {
2074                 iscsi_cls_session_printk(KERN_ERR, session,
2075                                          "could not register session's dev\n");
2076                 goto release_ida;
2077         }
2078         transport_register_device(&session->dev);
2079
2080         spin_lock_irqsave(&sesslock, flags);
2081         list_add(&session->sess_list, &sesslist);
2082         spin_unlock_irqrestore(&sesslock, flags);
2083
2084         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2085         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2086         return 0;
2087
2088 release_ida:
2089         if (session->ida_used)
2090                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2091
2092         return err;
2093 }
2094 EXPORT_SYMBOL_GPL(iscsi_add_session);
2095
2096 /**
2097  * iscsi_create_session - create iscsi class session
2098  * @shost: scsi host
2099  * @transport: iscsi transport
2100  * @dd_size: private driver data size
2101  * @target_id: which target
2102  *
2103  * This can be called from a LLD or iscsi_transport.
2104  */
2105 struct iscsi_cls_session *
2106 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2107                      int dd_size, unsigned int target_id)
2108 {
2109         struct iscsi_cls_session *session;
2110
2111         session = iscsi_alloc_session(shost, transport, dd_size);
2112         if (!session)
2113                 return NULL;
2114
2115         if (iscsi_add_session(session, target_id)) {
2116                 iscsi_free_session(session);
2117                 return NULL;
2118         }
2119         return session;
2120 }
2121 EXPORT_SYMBOL_GPL(iscsi_create_session);
2122
2123 static void iscsi_conn_release(struct device *dev)
2124 {
2125         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2126         struct device *parent = conn->dev.parent;
2127
2128         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2129         kfree(conn);
2130         put_device(parent);
2131 }
2132
2133 static int iscsi_is_conn_dev(const struct device *dev)
2134 {
2135         return dev->release == iscsi_conn_release;
2136 }
2137
2138 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2139 {
2140         if (!iscsi_is_conn_dev(dev))
2141                 return 0;
2142         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2143 }
2144
2145 void iscsi_remove_session(struct iscsi_cls_session *session)
2146 {
2147         unsigned long flags;
2148         int err;
2149
2150         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2151
2152         spin_lock_irqsave(&sesslock, flags);
2153         list_del(&session->sess_list);
2154         spin_unlock_irqrestore(&sesslock, flags);
2155
2156         /* make sure there are no blocks/unblocks queued */
2157         flush_workqueue(iscsi_eh_timer_workq);
2158         /* make sure the timedout callout is not running */
2159         if (!cancel_delayed_work(&session->recovery_work))
2160                 flush_workqueue(iscsi_eh_timer_workq);
2161         /*
2162          * If we are blocked let commands flow again. The lld or iscsi
2163          * layer should set up the queuecommand to fail commands.
2164          * We assume that LLD will not be calling block/unblock while
2165          * removing the session.
2166          */
2167         spin_lock_irqsave(&session->lock, flags);
2168         session->state = ISCSI_SESSION_FREE;
2169         spin_unlock_irqrestore(&session->lock, flags);
2170
2171         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2172         /* flush running scans then delete devices */
2173         flush_work(&session->scan_work);
2174         /* flush running unbind operations */
2175         flush_work(&session->unbind_work);
2176         __iscsi_unbind_session(&session->unbind_work);
2177
2178         /* hw iscsi may not have removed all connections from session */
2179         err = device_for_each_child(&session->dev, NULL,
2180                                     iscsi_iter_destroy_conn_fn);
2181         if (err)
2182                 iscsi_cls_session_printk(KERN_ERR, session,
2183                                          "Could not delete all connections "
2184                                          "for session. Error %d.\n", err);
2185
2186         transport_unregister_device(&session->dev);
2187
2188         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2189         device_del(&session->dev);
2190 }
2191 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2192
2193 void iscsi_free_session(struct iscsi_cls_session *session)
2194 {
2195         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2196         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2197         put_device(&session->dev);
2198 }
2199 EXPORT_SYMBOL_GPL(iscsi_free_session);
2200
2201 /**
2202  * iscsi_create_conn - create iscsi class connection
2203  * @session: iscsi cls session
2204  * @dd_size: private driver data size
2205  * @cid: connection id
2206  *
2207  * This can be called from a LLD or iscsi_transport. The connection
2208  * is child of the session so cid must be unique for all connections
2209  * on the session.
2210  *
2211  * Since we do not support MCS, cid will normally be zero. In some cases
2212  * for software iscsi we could be trying to preallocate a connection struct
2213  * in which case there could be two connection structs and cid would be
2214  * non-zero.
2215  */
2216 struct iscsi_cls_conn *
2217 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2218 {
2219         struct iscsi_transport *transport = session->transport;
2220         struct iscsi_cls_conn *conn;
2221         unsigned long flags;
2222         int err;
2223
2224         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2225         if (!conn)
2226                 return NULL;
2227         if (dd_size)
2228                 conn->dd_data = &conn[1];
2229
2230         mutex_init(&conn->ep_mutex);
2231         INIT_LIST_HEAD(&conn->conn_list);
2232         conn->transport = transport;
2233         conn->cid = cid;
2234
2235         /* this is released in the dev's release function */
2236         if (!get_device(&session->dev))
2237                 goto free_conn;
2238
2239         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2240         conn->dev.parent = &session->dev;
2241         conn->dev.release = iscsi_conn_release;
2242         err = device_register(&conn->dev);
2243         if (err) {
2244                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2245                                          "register connection's dev\n");
2246                 goto release_parent_ref;
2247         }
2248         transport_register_device(&conn->dev);
2249
2250         spin_lock_irqsave(&connlock, flags);
2251         list_add(&conn->conn_list, &connlist);
2252         spin_unlock_irqrestore(&connlock, flags);
2253
2254         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2255         return conn;
2256
2257 release_parent_ref:
2258         put_device(&session->dev);
2259 free_conn:
2260         kfree(conn);
2261         return NULL;
2262 }
2263
2264 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2265
2266 /**
2267  * iscsi_destroy_conn - destroy iscsi class connection
2268  * @conn: iscsi cls session
2269  *
2270  * This can be called from a LLD or iscsi_transport.
2271  */
2272 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2273 {
2274         unsigned long flags;
2275
2276         spin_lock_irqsave(&connlock, flags);
2277         list_del(&conn->conn_list);
2278         spin_unlock_irqrestore(&connlock, flags);
2279
2280         transport_unregister_device(&conn->dev);
2281         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2282         device_unregister(&conn->dev);
2283         return 0;
2284 }
2285 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2286
2287 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2288 {
2289         put_device(&conn->dev);
2290 }
2291 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2292
2293 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2294 {
2295         get_device(&conn->dev);
2296 }
2297 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2298
2299 /*
2300  * iscsi interface functions
2301  */
2302 static struct iscsi_internal *
2303 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2304 {
2305         struct iscsi_internal *priv;
2306         unsigned long flags;
2307
2308         spin_lock_irqsave(&iscsi_transport_lock, flags);
2309         list_for_each_entry(priv, &iscsi_transports, list) {
2310                 if (tt == priv->iscsi_transport) {
2311                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2312                         return priv;
2313                 }
2314         }
2315         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2316         return NULL;
2317 }
2318
2319 static int
2320 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2321 {
2322         return nlmsg_multicast(nls, skb, 0, group, gfp);
2323 }
2324
2325 static int
2326 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2327 {
2328         return nlmsg_unicast(nls, skb, portid);
2329 }
2330
2331 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2332                    char *data, uint32_t data_size)
2333 {
2334         struct nlmsghdr *nlh;
2335         struct sk_buff *skb;
2336         struct iscsi_uevent *ev;
2337         char *pdu;
2338         struct iscsi_internal *priv;
2339         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2340                                    data_size);
2341
2342         priv = iscsi_if_transport_lookup(conn->transport);
2343         if (!priv)
2344                 return -EINVAL;
2345
2346         skb = alloc_skb(len, GFP_ATOMIC);
2347         if (!skb) {
2348                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2349                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2350                                       "control PDU: OOM\n");
2351                 return -ENOMEM;
2352         }
2353
2354         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2355         ev = nlmsg_data(nlh);
2356         memset(ev, 0, sizeof(*ev));
2357         ev->transport_handle = iscsi_handle(conn->transport);
2358         ev->type = ISCSI_KEVENT_RECV_PDU;
2359         ev->r.recv_req.cid = conn->cid;
2360         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2361         pdu = (char*)ev + sizeof(*ev);
2362         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2363         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2364
2365         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2366 }
2367 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2368
2369 int iscsi_offload_mesg(struct Scsi_Host *shost,
2370                        struct iscsi_transport *transport, uint32_t type,
2371                        char *data, uint16_t data_size)
2372 {
2373         struct nlmsghdr *nlh;
2374         struct sk_buff *skb;
2375         struct iscsi_uevent *ev;
2376         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2377
2378         skb = alloc_skb(len, GFP_ATOMIC);
2379         if (!skb) {
2380                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2381                 return -ENOMEM;
2382         }
2383
2384         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2385         ev = nlmsg_data(nlh);
2386         memset(ev, 0, sizeof(*ev));
2387         ev->type = type;
2388         ev->transport_handle = iscsi_handle(transport);
2389         switch (type) {
2390         case ISCSI_KEVENT_PATH_REQ:
2391                 ev->r.req_path.host_no = shost->host_no;
2392                 break;
2393         case ISCSI_KEVENT_IF_DOWN:
2394                 ev->r.notify_if_down.host_no = shost->host_no;
2395                 break;
2396         }
2397
2398         memcpy((char *)ev + sizeof(*ev), data, data_size);
2399
2400         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2401 }
2402 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2403
2404 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2405 {
2406         struct nlmsghdr *nlh;
2407         struct sk_buff  *skb;
2408         struct iscsi_uevent *ev;
2409         struct iscsi_internal *priv;
2410         int len = nlmsg_total_size(sizeof(*ev));
2411
2412         priv = iscsi_if_transport_lookup(conn->transport);
2413         if (!priv)
2414                 return;
2415
2416         skb = alloc_skb(len, GFP_ATOMIC);
2417         if (!skb) {
2418                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2419                                       "conn error (%d)\n", error);
2420                 return;
2421         }
2422
2423         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2424         ev = nlmsg_data(nlh);
2425         ev->transport_handle = iscsi_handle(conn->transport);
2426         ev->type = ISCSI_KEVENT_CONN_ERROR;
2427         ev->r.connerror.error = error;
2428         ev->r.connerror.cid = conn->cid;
2429         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2430
2431         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2432
2433         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2434                               error);
2435 }
2436 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2437
2438 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2439                             enum iscsi_conn_state state)
2440 {
2441         struct nlmsghdr *nlh;
2442         struct sk_buff  *skb;
2443         struct iscsi_uevent *ev;
2444         struct iscsi_internal *priv;
2445         int len = nlmsg_total_size(sizeof(*ev));
2446
2447         priv = iscsi_if_transport_lookup(conn->transport);
2448         if (!priv)
2449                 return;
2450
2451         skb = alloc_skb(len, GFP_ATOMIC);
2452         if (!skb) {
2453                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2454                                       "conn login (%d)\n", state);
2455                 return;
2456         }
2457
2458         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2459         ev = nlmsg_data(nlh);
2460         ev->transport_handle = iscsi_handle(conn->transport);
2461         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2462         ev->r.conn_login.state = state;
2463         ev->r.conn_login.cid = conn->cid;
2464         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2465         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2466
2467         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2468                               state);
2469 }
2470 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2471
2472 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2473                            enum iscsi_host_event_code code, uint32_t data_size,
2474                            uint8_t *data)
2475 {
2476         struct nlmsghdr *nlh;
2477         struct sk_buff *skb;
2478         struct iscsi_uevent *ev;
2479         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2480
2481         skb = alloc_skb(len, GFP_NOIO);
2482         if (!skb) {
2483                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2484                        host_no, code);
2485                 return;
2486         }
2487
2488         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2489         ev = nlmsg_data(nlh);
2490         ev->transport_handle = iscsi_handle(transport);
2491         ev->type = ISCSI_KEVENT_HOST_EVENT;
2492         ev->r.host_event.host_no = host_no;
2493         ev->r.host_event.code = code;
2494         ev->r.host_event.data_size = data_size;
2495
2496         if (data_size)
2497                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2498
2499         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2500 }
2501 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2502
2503 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2504                            uint32_t status, uint32_t pid, uint32_t data_size,
2505                            uint8_t *data)
2506 {
2507         struct nlmsghdr *nlh;
2508         struct sk_buff *skb;
2509         struct iscsi_uevent *ev;
2510         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2511
2512         skb = alloc_skb(len, GFP_NOIO);
2513         if (!skb) {
2514                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2515                 return;
2516         }
2517
2518         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2519         ev = nlmsg_data(nlh);
2520         ev->transport_handle = iscsi_handle(transport);
2521         ev->type = ISCSI_KEVENT_PING_COMP;
2522         ev->r.ping_comp.host_no = host_no;
2523         ev->r.ping_comp.status = status;
2524         ev->r.ping_comp.pid = pid;
2525         ev->r.ping_comp.data_size = data_size;
2526         memcpy((char *)ev + sizeof(*ev), data, data_size);
2527
2528         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2529 }
2530 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2531
2532 static int
2533 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2534 {
2535         struct sk_buff  *skb;
2536         struct nlmsghdr *nlh;
2537         int len = nlmsg_total_size(size);
2538
2539         skb = alloc_skb(len, GFP_ATOMIC);
2540         if (!skb) {
2541                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2542                 return -ENOMEM;
2543         }
2544
2545         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2546         memcpy(nlmsg_data(nlh), payload, size);
2547         return iscsi_unicast_skb(skb, portid);
2548 }
2549
2550 static int
2551 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2552 {
2553         struct iscsi_uevent *ev = nlmsg_data(nlh);
2554         struct iscsi_stats *stats;
2555         struct sk_buff *skbstat;
2556         struct iscsi_cls_conn *conn;
2557         struct nlmsghdr *nlhstat;
2558         struct iscsi_uevent *evstat;
2559         struct iscsi_internal *priv;
2560         int len = nlmsg_total_size(sizeof(*ev) +
2561                                    sizeof(struct iscsi_stats) +
2562                                    sizeof(struct iscsi_stats_custom) *
2563                                    ISCSI_STATS_CUSTOM_MAX);
2564         int err = 0;
2565
2566         priv = iscsi_if_transport_lookup(transport);
2567         if (!priv)
2568                 return -EINVAL;
2569
2570         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2571         if (!conn)
2572                 return -EEXIST;
2573
2574         do {
2575                 int actual_size;
2576
2577                 skbstat = alloc_skb(len, GFP_ATOMIC);
2578                 if (!skbstat) {
2579                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2580                                               "deliver stats: OOM\n");
2581                         return -ENOMEM;
2582                 }
2583
2584                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2585                                       (len - sizeof(*nlhstat)), 0);
2586                 evstat = nlmsg_data(nlhstat);
2587                 memset(evstat, 0, sizeof(*evstat));
2588                 evstat->transport_handle = iscsi_handle(conn->transport);
2589                 evstat->type = nlh->nlmsg_type;
2590                 evstat->u.get_stats.cid =
2591                         ev->u.get_stats.cid;
2592                 evstat->u.get_stats.sid =
2593                         ev->u.get_stats.sid;
2594                 stats = (struct iscsi_stats *)
2595                         ((char*)evstat + sizeof(*evstat));
2596                 memset(stats, 0, sizeof(*stats));
2597
2598                 transport->get_stats(conn, stats);
2599                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2600                                                sizeof(struct iscsi_stats) +
2601                                                sizeof(struct iscsi_stats_custom) *
2602                                                stats->custom_length);
2603                 actual_size -= sizeof(*nlhstat);
2604                 actual_size = nlmsg_msg_size(actual_size);
2605                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2606                 nlhstat->nlmsg_len = actual_size;
2607
2608                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2609                                           GFP_ATOMIC);
2610         } while (err < 0 && err != -ECONNREFUSED);
2611
2612         return err;
2613 }
2614
2615 /**
2616  * iscsi_session_event - send session destr. completion event
2617  * @session: iscsi class session
2618  * @event: type of event
2619  */
2620 int iscsi_session_event(struct iscsi_cls_session *session,
2621                         enum iscsi_uevent_e event)
2622 {
2623         struct iscsi_internal *priv;
2624         struct Scsi_Host *shost;
2625         struct iscsi_uevent *ev;
2626         struct sk_buff  *skb;
2627         struct nlmsghdr *nlh;
2628         int rc, len = nlmsg_total_size(sizeof(*ev));
2629
2630         priv = iscsi_if_transport_lookup(session->transport);
2631         if (!priv)
2632                 return -EINVAL;
2633         shost = iscsi_session_to_shost(session);
2634
2635         skb = alloc_skb(len, GFP_KERNEL);
2636         if (!skb) {
2637                 iscsi_cls_session_printk(KERN_ERR, session,
2638                                          "Cannot notify userspace of session "
2639                                          "event %u\n", event);
2640                 return -ENOMEM;
2641         }
2642
2643         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2644         ev = nlmsg_data(nlh);
2645         ev->transport_handle = iscsi_handle(session->transport);
2646
2647         ev->type = event;
2648         switch (event) {
2649         case ISCSI_KEVENT_DESTROY_SESSION:
2650                 ev->r.d_session.host_no = shost->host_no;
2651                 ev->r.d_session.sid = session->sid;
2652                 break;
2653         case ISCSI_KEVENT_CREATE_SESSION:
2654                 ev->r.c_session_ret.host_no = shost->host_no;
2655                 ev->r.c_session_ret.sid = session->sid;
2656                 break;
2657         case ISCSI_KEVENT_UNBIND_SESSION:
2658                 ev->r.unbind_session.host_no = shost->host_no;
2659                 ev->r.unbind_session.sid = session->sid;
2660                 break;
2661         default:
2662                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2663                                          "%u.\n", event);
2664                 kfree_skb(skb);
2665                 return -EINVAL;
2666         }
2667
2668         /*
2669          * this will occur if the daemon is not up, so we just warn
2670          * the user and when the daemon is restarted it will handle it
2671          */
2672         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2673         if (rc == -ESRCH)
2674                 iscsi_cls_session_printk(KERN_ERR, session,
2675                                          "Cannot notify userspace of session "
2676                                          "event %u. Check iscsi daemon\n",
2677                                          event);
2678
2679         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2680                                 event, rc);
2681         return rc;
2682 }
2683 EXPORT_SYMBOL_GPL(iscsi_session_event);
2684
2685 static int
2686 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2687                         struct iscsi_uevent *ev, pid_t pid,
2688                         uint32_t initial_cmdsn, uint16_t cmds_max,
2689                         uint16_t queue_depth)
2690 {
2691         struct iscsi_transport *transport = priv->iscsi_transport;
2692         struct iscsi_cls_session *session;
2693         struct Scsi_Host *shost;
2694
2695         session = transport->create_session(ep, cmds_max, queue_depth,
2696                                             initial_cmdsn);
2697         if (!session)
2698                 return -ENOMEM;
2699
2700         session->creator = pid;
2701         shost = iscsi_session_to_shost(session);
2702         ev->r.c_session_ret.host_no = shost->host_no;
2703         ev->r.c_session_ret.sid = session->sid;
2704         ISCSI_DBG_TRANS_SESSION(session,
2705                                 "Completed creating transport session\n");
2706         return 0;
2707 }
2708
2709 static int
2710 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2711 {
2712         struct iscsi_cls_conn *conn;
2713         struct iscsi_cls_session *session;
2714
2715         session = iscsi_session_lookup(ev->u.c_conn.sid);
2716         if (!session) {
2717                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2718                        ev->u.c_conn.sid);
2719                 return -EINVAL;
2720         }
2721
2722         conn = transport->create_conn(session, ev->u.c_conn.cid);
2723         if (!conn) {
2724                 iscsi_cls_session_printk(KERN_ERR, session,
2725                                          "couldn't create a new connection.");
2726                 return -ENOMEM;
2727         }
2728
2729         ev->r.c_conn_ret.sid = session->sid;
2730         ev->r.c_conn_ret.cid = conn->cid;
2731
2732         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2733         return 0;
2734 }
2735
2736 static int
2737 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2738 {
2739         struct iscsi_cls_conn *conn;
2740
2741         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2742         if (!conn)
2743                 return -EINVAL;
2744
2745         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2746         if (transport->destroy_conn)
2747                 transport->destroy_conn(conn);
2748
2749         return 0;
2750 }
2751
2752 static int
2753 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2754 {
2755         char *data = (char*)ev + sizeof(*ev);
2756         struct iscsi_cls_conn *conn;
2757         struct iscsi_cls_session *session;
2758         int err = 0, value = 0;
2759
2760         if (ev->u.set_param.len > PAGE_SIZE)
2761                 return -EINVAL;
2762
2763         session = iscsi_session_lookup(ev->u.set_param.sid);
2764         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2765         if (!conn || !session)
2766                 return -EINVAL;
2767
2768         /* data will be regarded as NULL-ended string, do length check */
2769         if (strlen(data) > ev->u.set_param.len)
2770                 return -EINVAL;
2771
2772         switch (ev->u.set_param.param) {
2773         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2774                 sscanf(data, "%d", &value);
2775                 if (!session->recovery_tmo_sysfs_override)
2776                         session->recovery_tmo = value;
2777                 break;
2778         default:
2779                 err = transport->set_param(conn, ev->u.set_param.param,
2780                                            data, ev->u.set_param.len);
2781         }
2782
2783         return err;
2784 }
2785
2786 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2787                                struct iscsi_uevent *ev, int msg_type)
2788 {
2789         struct iscsi_endpoint *ep;
2790         struct sockaddr *dst_addr;
2791         struct Scsi_Host *shost = NULL;
2792         int non_blocking, err = 0;
2793
2794         if (!transport->ep_connect)
2795                 return -EINVAL;
2796
2797         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2798                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2799                 if (!shost) {
2800                         printk(KERN_ERR "ep connect failed. Could not find "
2801                                "host no %u\n",
2802                                ev->u.ep_connect_through_host.host_no);
2803                         return -ENODEV;
2804                 }
2805                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2806         } else
2807                 non_blocking = ev->u.ep_connect.non_blocking;
2808
2809         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2810         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2811         if (IS_ERR(ep)) {
2812                 err = PTR_ERR(ep);
2813                 goto release_host;
2814         }
2815
2816         ev->r.ep_connect_ret.handle = ep->id;
2817 release_host:
2818         if (shost)
2819                 scsi_host_put(shost);
2820         return err;
2821 }
2822
2823 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2824                                   u64 ep_handle)
2825 {
2826         struct iscsi_cls_conn *conn;
2827         struct iscsi_endpoint *ep;
2828
2829         if (!transport->ep_disconnect)
2830                 return -EINVAL;
2831
2832         ep = iscsi_lookup_endpoint(ep_handle);
2833         if (!ep)
2834                 return -EINVAL;
2835         conn = ep->conn;
2836         if (conn) {
2837                 mutex_lock(&conn->ep_mutex);
2838                 conn->ep = NULL;
2839                 mutex_unlock(&conn->ep_mutex);
2840         }
2841
2842         transport->ep_disconnect(ep);
2843         return 0;
2844 }
2845
2846 static int
2847 iscsi_if_transport_ep(struct iscsi_transport *transport,
2848                       struct iscsi_uevent *ev, int msg_type)
2849 {
2850         struct iscsi_endpoint *ep;
2851         int rc = 0;
2852
2853         switch (msg_type) {
2854         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2855         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2856                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2857                 break;
2858         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2859                 if (!transport->ep_poll)
2860                         return -EINVAL;
2861
2862                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2863                 if (!ep)
2864                         return -EINVAL;
2865
2866                 ev->r.retcode = transport->ep_poll(ep,
2867                                                    ev->u.ep_poll.timeout_ms);
2868                 break;
2869         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2870                 rc = iscsi_if_ep_disconnect(transport,
2871                                             ev->u.ep_disconnect.ep_handle);
2872                 break;
2873         }
2874         return rc;
2875 }
2876
2877 static int
2878 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2879                 struct iscsi_uevent *ev)
2880 {
2881         struct Scsi_Host *shost;
2882         struct sockaddr *dst_addr;
2883         int err;
2884
2885         if (!transport->tgt_dscvr)
2886                 return -EINVAL;
2887
2888         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2889         if (!shost) {
2890                 printk(KERN_ERR "target discovery could not find host no %u\n",
2891                        ev->u.tgt_dscvr.host_no);
2892                 return -ENODEV;
2893         }
2894
2895
2896         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2897         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2898                                    ev->u.tgt_dscvr.enable, dst_addr);
2899         scsi_host_put(shost);
2900         return err;
2901 }
2902
2903 static int
2904 iscsi_set_host_param(struct iscsi_transport *transport,
2905                      struct iscsi_uevent *ev)
2906 {
2907         char *data = (char*)ev + sizeof(*ev);
2908         struct Scsi_Host *shost;
2909         int err;
2910
2911         if (!transport->set_host_param)
2912                 return -ENOSYS;
2913
2914         if (ev->u.set_host_param.len > PAGE_SIZE)
2915                 return -EINVAL;
2916
2917         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2918         if (!shost) {
2919                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2920                        ev->u.set_host_param.host_no);
2921                 return -ENODEV;
2922         }
2923
2924         /* see similar check in iscsi_if_set_param() */
2925         if (strlen(data) > ev->u.set_host_param.len)
2926                 return -EINVAL;
2927
2928         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2929                                         data, ev->u.set_host_param.len);
2930         scsi_host_put(shost);
2931         return err;
2932 }
2933
2934 static int
2935 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2936 {
2937         struct Scsi_Host *shost;
2938         struct iscsi_path *params;
2939         int err;
2940
2941         if (!transport->set_path)
2942                 return -ENOSYS;
2943
2944         shost = scsi_host_lookup(ev->u.set_path.host_no);
2945         if (!shost) {
2946                 printk(KERN_ERR "set path could not find host no %u\n",
2947                        ev->u.set_path.host_no);
2948                 return -ENODEV;
2949         }
2950
2951         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2952         err = transport->set_path(shost, params);
2953
2954         scsi_host_put(shost);
2955         return err;
2956 }
2957
2958 static int iscsi_session_has_conns(int sid)
2959 {
2960         struct iscsi_cls_conn *conn;
2961         unsigned long flags;
2962         int found = 0;
2963
2964         spin_lock_irqsave(&connlock, flags);
2965         list_for_each_entry(conn, &connlist, conn_list) {
2966                 if (iscsi_conn_get_sid(conn) == sid) {
2967                         found = 1;
2968                         break;
2969                 }
2970         }
2971         spin_unlock_irqrestore(&connlock, flags);
2972
2973         return found;
2974 }
2975
2976 static int
2977 iscsi_set_iface_params(struct iscsi_transport *transport,
2978                        struct iscsi_uevent *ev, uint32_t len)
2979 {
2980         char *data = (char *)ev + sizeof(*ev);
2981         struct Scsi_Host *shost;
2982         int err;
2983
2984         if (!transport->set_iface_param)
2985                 return -ENOSYS;
2986
2987         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2988         if (!shost) {
2989                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2990                        ev->u.set_iface_params.host_no);
2991                 return -ENODEV;
2992         }
2993
2994         err = transport->set_iface_param(shost, data, len);
2995         scsi_host_put(shost);
2996         return err;
2997 }
2998
2999 static int
3000 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3001 {
3002         struct Scsi_Host *shost;
3003         struct sockaddr *dst_addr;
3004         int err;
3005
3006         if (!transport->send_ping)
3007                 return -ENOSYS;
3008
3009         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3010         if (!shost) {
3011                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3012                        ev->u.iscsi_ping.host_no);
3013                 return -ENODEV;
3014         }
3015
3016         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3017         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3018                                    ev->u.iscsi_ping.iface_type,
3019                                    ev->u.iscsi_ping.payload_size,
3020                                    ev->u.iscsi_ping.pid,
3021                                    dst_addr);
3022         scsi_host_put(shost);
3023         return err;
3024 }
3025
3026 static int
3027 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3028 {
3029         struct iscsi_uevent *ev = nlmsg_data(nlh);
3030         struct Scsi_Host *shost = NULL;
3031         struct iscsi_chap_rec *chap_rec;
3032         struct iscsi_internal *priv;
3033         struct sk_buff *skbchap;
3034         struct nlmsghdr *nlhchap;
3035         struct iscsi_uevent *evchap;
3036         uint32_t chap_buf_size;
3037         int len, err = 0;
3038         char *buf;
3039
3040         if (!transport->get_chap)
3041                 return -EINVAL;
3042
3043         priv = iscsi_if_transport_lookup(transport);
3044         if (!priv)
3045                 return -EINVAL;
3046
3047         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3048         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3049
3050         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3051         if (!shost) {
3052                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3053                        __func__, ev->u.get_chap.host_no);
3054                 return -ENODEV;
3055         }
3056
3057         do {
3058                 int actual_size;
3059
3060                 skbchap = alloc_skb(len, GFP_KERNEL);
3061                 if (!skbchap) {
3062                         printk(KERN_ERR "can not deliver chap: OOM\n");
3063                         err = -ENOMEM;
3064                         goto exit_get_chap;
3065                 }
3066
3067                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3068                                       (len - sizeof(*nlhchap)), 0);
3069                 evchap = nlmsg_data(nlhchap);
3070                 memset(evchap, 0, sizeof(*evchap));
3071                 evchap->transport_handle = iscsi_handle(transport);
3072                 evchap->type = nlh->nlmsg_type;
3073                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3074                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3075                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3076                 buf = (char *)evchap + sizeof(*evchap);
3077                 memset(buf, 0, chap_buf_size);
3078
3079                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3080                                     &evchap->u.get_chap.num_entries, buf);
3081
3082                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3083                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3084                 nlhchap->nlmsg_len = actual_size;
3085
3086                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3087                                           GFP_KERNEL);
3088         } while (err < 0 && err != -ECONNREFUSED);
3089
3090 exit_get_chap:
3091         scsi_host_put(shost);
3092         return err;
3093 }
3094
3095 static int iscsi_set_chap(struct iscsi_transport *transport,
3096                           struct iscsi_uevent *ev, uint32_t len)
3097 {
3098         char *data = (char *)ev + sizeof(*ev);
3099         struct Scsi_Host *shost;
3100         int err = 0;
3101
3102         if (!transport->set_chap)
3103                 return -ENOSYS;
3104
3105         shost = scsi_host_lookup(ev->u.set_path.host_no);
3106         if (!shost) {
3107                 pr_err("%s could not find host no %u\n",
3108                        __func__, ev->u.set_path.host_no);
3109                 return -ENODEV;
3110         }
3111
3112         err = transport->set_chap(shost, data, len);
3113         scsi_host_put(shost);
3114         return err;
3115 }
3116
3117 static int iscsi_delete_chap(struct iscsi_transport *transport,
3118                              struct iscsi_uevent *ev)
3119 {
3120         struct Scsi_Host *shost;
3121         int err = 0;
3122
3123         if (!transport->delete_chap)
3124                 return -ENOSYS;
3125
3126         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3127         if (!shost) {
3128                 printk(KERN_ERR "%s could not find host no %u\n",
3129                        __func__, ev->u.delete_chap.host_no);
3130                 return -ENODEV;
3131         }
3132
3133         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3134         scsi_host_put(shost);
3135         return err;
3136 }
3137
3138 static const struct {
3139         enum iscsi_discovery_parent_type value;
3140         char                            *name;
3141 } iscsi_discovery_parent_names[] = {
3142         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3143         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3144         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3145 };
3146
3147 char *iscsi_get_discovery_parent_name(int parent_type)
3148 {
3149         int i;
3150         char *state = "Unknown!";
3151
3152         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3153                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3154                         state = iscsi_discovery_parent_names[i].name;
3155                         break;
3156                 }
3157         }
3158         return state;
3159 }
3160 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3161
3162 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3163                                      struct iscsi_uevent *ev, uint32_t len)
3164 {
3165         char *data = (char *)ev + sizeof(*ev);
3166         struct Scsi_Host *shost;
3167         struct iscsi_bus_flash_session *fnode_sess;
3168         struct iscsi_bus_flash_conn *fnode_conn;
3169         struct device *dev;
3170         uint32_t idx;
3171         int err = 0;
3172
3173         if (!transport->set_flashnode_param) {
3174                 err = -ENOSYS;
3175                 goto exit_set_fnode;
3176         }
3177
3178         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3179         if (!shost) {
3180                 pr_err("%s could not find host no %u\n",
3181                        __func__, ev->u.set_flashnode.host_no);
3182                 err = -ENODEV;
3183                 goto exit_set_fnode;
3184         }
3185
3186         idx = ev->u.set_flashnode.flashnode_idx;
3187         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3188         if (!fnode_sess) {
3189                 pr_err("%s could not find flashnode %u for host no %u\n",
3190                        __func__, idx, ev->u.set_flashnode.host_no);
3191                 err = -ENODEV;
3192                 goto put_host;
3193         }
3194
3195         dev = iscsi_find_flashnode_conn(fnode_sess);
3196         if (!dev) {
3197                 err = -ENODEV;
3198                 goto put_sess;
3199         }
3200
3201         fnode_conn = iscsi_dev_to_flash_conn(dev);
3202         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3203         put_device(dev);
3204
3205 put_sess:
3206         put_device(&fnode_sess->dev);
3207
3208 put_host:
3209         scsi_host_put(shost);
3210
3211 exit_set_fnode:
3212         return err;
3213 }
3214
3215 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3216                                struct iscsi_uevent *ev, uint32_t len)
3217 {
3218         char *data = (char *)ev + sizeof(*ev);
3219         struct Scsi_Host *shost;
3220         int index;
3221         int err = 0;
3222
3223         if (!transport->new_flashnode) {
3224                 err = -ENOSYS;
3225                 goto exit_new_fnode;
3226         }
3227
3228         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3229         if (!shost) {
3230                 pr_err("%s could not find host no %u\n",
3231                        __func__, ev->u.new_flashnode.host_no);
3232                 err = -ENODEV;
3233                 goto put_host;
3234         }
3235
3236         index = transport->new_flashnode(shost, data, len);
3237
3238         if (index >= 0)
3239                 ev->r.new_flashnode_ret.flashnode_idx = index;
3240         else
3241                 err = -EIO;
3242
3243 put_host:
3244         scsi_host_put(shost);
3245
3246 exit_new_fnode:
3247         return err;
3248 }
3249
3250 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3251                                struct iscsi_uevent *ev)
3252 {
3253         struct Scsi_Host *shost;
3254         struct iscsi_bus_flash_session *fnode_sess;
3255         uint32_t idx;
3256         int err = 0;
3257
3258         if (!transport->del_flashnode) {
3259                 err = -ENOSYS;
3260                 goto exit_del_fnode;
3261         }
3262
3263         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3264         if (!shost) {
3265                 pr_err("%s could not find host no %u\n",
3266                        __func__, ev->u.del_flashnode.host_no);
3267                 err = -ENODEV;
3268                 goto put_host;
3269         }
3270
3271         idx = ev->u.del_flashnode.flashnode_idx;
3272         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3273         if (!fnode_sess) {
3274                 pr_err("%s could not find flashnode %u for host no %u\n",
3275                        __func__, idx, ev->u.del_flashnode.host_no);
3276                 err = -ENODEV;
3277                 goto put_host;
3278         }
3279
3280         err = transport->del_flashnode(fnode_sess);
3281         put_device(&fnode_sess->dev);
3282
3283 put_host:
3284         scsi_host_put(shost);
3285
3286 exit_del_fnode:
3287         return err;
3288 }
3289
3290 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3291                                  struct iscsi_uevent *ev)
3292 {
3293         struct Scsi_Host *shost;
3294         struct iscsi_bus_flash_session *fnode_sess;
3295         struct iscsi_bus_flash_conn *fnode_conn;
3296         struct device *dev;
3297         uint32_t idx;
3298         int err = 0;
3299
3300         if (!transport->login_flashnode) {
3301                 err = -ENOSYS;
3302                 goto exit_login_fnode;
3303         }
3304
3305         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3306         if (!shost) {
3307                 pr_err("%s could not find host no %u\n",
3308                        __func__, ev->u.login_flashnode.host_no);
3309                 err = -ENODEV;
3310                 goto put_host;
3311         }
3312
3313         idx = ev->u.login_flashnode.flashnode_idx;
3314         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3315         if (!fnode_sess) {
3316                 pr_err("%s could not find flashnode %u for host no %u\n",
3317                        __func__, idx, ev->u.login_flashnode.host_no);
3318                 err = -ENODEV;
3319                 goto put_host;
3320         }
3321
3322         dev = iscsi_find_flashnode_conn(fnode_sess);
3323         if (!dev) {
3324                 err = -ENODEV;
3325                 goto put_sess;
3326         }
3327
3328         fnode_conn = iscsi_dev_to_flash_conn(dev);
3329         err = transport->login_flashnode(fnode_sess, fnode_conn);
3330         put_device(dev);
3331
3332 put_sess:
3333         put_device(&fnode_sess->dev);
3334
3335 put_host:
3336         scsi_host_put(shost);
3337
3338 exit_login_fnode:
3339         return err;
3340 }
3341
3342 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3343                                   struct iscsi_uevent *ev)
3344 {
3345         struct Scsi_Host *shost;
3346         struct iscsi_bus_flash_session *fnode_sess;
3347         struct iscsi_bus_flash_conn *fnode_conn;
3348         struct device *dev;
3349         uint32_t idx;
3350         int err = 0;
3351
3352         if (!transport->logout_flashnode) {
3353                 err = -ENOSYS;
3354                 goto exit_logout_fnode;
3355         }
3356
3357         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3358         if (!shost) {
3359                 pr_err("%s could not find host no %u\n",
3360                        __func__, ev->u.logout_flashnode.host_no);
3361                 err = -ENODEV;
3362                 goto put_host;
3363         }
3364
3365         idx = ev->u.logout_flashnode.flashnode_idx;
3366         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3367         if (!fnode_sess) {
3368                 pr_err("%s could not find flashnode %u for host no %u\n",
3369                        __func__, idx, ev->u.logout_flashnode.host_no);
3370                 err = -ENODEV;
3371                 goto put_host;
3372         }
3373
3374         dev = iscsi_find_flashnode_conn(fnode_sess);
3375         if (!dev) {
3376                 err = -ENODEV;
3377                 goto put_sess;
3378         }
3379
3380         fnode_conn = iscsi_dev_to_flash_conn(dev);
3381
3382         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3383         put_device(dev);
3384
3385 put_sess:
3386         put_device(&fnode_sess->dev);
3387
3388 put_host:
3389         scsi_host_put(shost);
3390
3391 exit_logout_fnode:
3392         return err;
3393 }
3394
3395 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3396                                       struct iscsi_uevent *ev)
3397 {
3398         struct Scsi_Host *shost;
3399         struct iscsi_cls_session *session;
3400         int err = 0;
3401
3402         if (!transport->logout_flashnode_sid) {
3403                 err = -ENOSYS;
3404                 goto exit_logout_sid;
3405         }
3406
3407         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3408         if (!shost) {
3409                 pr_err("%s could not find host no %u\n",
3410                        __func__, ev->u.logout_flashnode.host_no);
3411                 err = -ENODEV;
3412                 goto put_host;
3413         }
3414
3415         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3416         if (!session) {
3417                 pr_err("%s could not find session id %u\n",
3418                        __func__, ev->u.logout_flashnode_sid.sid);
3419                 err = -EINVAL;
3420                 goto put_host;
3421         }
3422
3423         err = transport->logout_flashnode_sid(session);
3424
3425 put_host:
3426         scsi_host_put(shost);
3427
3428 exit_logout_sid:
3429         return err;
3430 }
3431
3432 static int
3433 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3434 {
3435         struct iscsi_uevent *ev = nlmsg_data(nlh);
3436         struct Scsi_Host *shost = NULL;
3437         struct iscsi_internal *priv;
3438         struct sk_buff *skbhost_stats;
3439         struct nlmsghdr *nlhhost_stats;
3440         struct iscsi_uevent *evhost_stats;
3441         int host_stats_size = 0;
3442         int len, err = 0;
3443         char *buf;
3444
3445         if (!transport->get_host_stats)
3446                 return -ENOSYS;
3447
3448         priv = iscsi_if_transport_lookup(transport);
3449         if (!priv)
3450                 return -EINVAL;
3451
3452         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3453         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3454
3455         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3456         if (!shost) {
3457                 pr_err("%s: failed. Cound not find host no %u\n",
3458                        __func__, ev->u.get_host_stats.host_no);
3459                 return -ENODEV;
3460         }
3461
3462         do {
3463                 int actual_size;
3464
3465                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3466                 if (!skbhost_stats) {
3467                         pr_err("cannot deliver host stats: OOM\n");
3468                         err = -ENOMEM;
3469                         goto exit_host_stats;
3470                 }
3471
3472                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3473                                       (len - sizeof(*nlhhost_stats)), 0);
3474                 evhost_stats = nlmsg_data(nlhhost_stats);
3475                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3476                 evhost_stats->transport_handle = iscsi_handle(transport);
3477                 evhost_stats->type = nlh->nlmsg_type;
3478                 evhost_stats->u.get_host_stats.host_no =
3479                                         ev->u.get_host_stats.host_no;
3480                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3481                 memset(buf, 0, host_stats_size);
3482
3483                 err = transport->get_host_stats(shost, buf, host_stats_size);
3484                 if (err) {
3485                         kfree_skb(skbhost_stats);
3486                         goto exit_host_stats;
3487                 }
3488
3489                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3490                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3491                 nlhhost_stats->nlmsg_len = actual_size;
3492
3493                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3494                                           GFP_KERNEL);
3495         } while (err < 0 && err != -ECONNREFUSED);
3496
3497 exit_host_stats:
3498         scsi_host_put(shost);
3499         return err;
3500 }
3501
3502
3503 static int
3504 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3505 {
3506         int err = 0;
3507         u32 portid;
3508         u32 pdu_len;
3509         struct iscsi_uevent *ev = nlmsg_data(nlh);
3510         struct iscsi_transport *transport = NULL;
3511         struct iscsi_internal *priv;
3512         struct iscsi_cls_session *session;
3513         struct iscsi_cls_conn *conn;
3514         struct iscsi_endpoint *ep = NULL;
3515
3516         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3517                 return -EPERM;
3518
3519         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3520                 *group = ISCSI_NL_GRP_UIP;
3521         else
3522                 *group = ISCSI_NL_GRP_ISCSID;
3523
3524         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3525         if (!priv)
3526                 return -EINVAL;
3527         transport = priv->iscsi_transport;
3528
3529         if (!try_module_get(transport->owner))
3530                 return -EINVAL;
3531
3532         portid = NETLINK_CB(skb).portid;
3533
3534         switch (nlh->nlmsg_type) {
3535         case ISCSI_UEVENT_CREATE_SESSION:
3536                 err = iscsi_if_create_session(priv, ep, ev,
3537                                               portid,
3538                                               ev->u.c_session.initial_cmdsn,
3539                                               ev->u.c_session.cmds_max,
3540                                               ev->u.c_session.queue_depth);
3541                 break;
3542         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3543                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3544                 if (!ep) {
3545                         err = -EINVAL;
3546                         break;
3547                 }
3548
3549                 err = iscsi_if_create_session(priv, ep, ev,
3550                                         portid,
3551                                         ev->u.c_bound_session.initial_cmdsn,
3552                                         ev->u.c_bound_session.cmds_max,
3553                                         ev->u.c_bound_session.queue_depth);
3554                 break;
3555         case ISCSI_UEVENT_DESTROY_SESSION:
3556                 session = iscsi_session_lookup(ev->u.d_session.sid);
3557                 if (!session)
3558                         err = -EINVAL;
3559                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3560                         err = -EBUSY;
3561                 else
3562                         transport->destroy_session(session);
3563                 break;
3564         case ISCSI_UEVENT_UNBIND_SESSION:
3565                 session = iscsi_session_lookup(ev->u.d_session.sid);
3566                 if (session)
3567                         scsi_queue_work(iscsi_session_to_shost(session),
3568                                         &session->unbind_work);
3569                 else
3570                         err = -EINVAL;
3571                 break;
3572         case ISCSI_UEVENT_CREATE_CONN:
3573                 err = iscsi_if_create_conn(transport, ev);
3574                 break;
3575         case ISCSI_UEVENT_DESTROY_CONN:
3576                 err = iscsi_if_destroy_conn(transport, ev);
3577                 break;
3578         case ISCSI_UEVENT_BIND_CONN:
3579                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3580                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3581
3582                 if (conn && conn->ep)
3583                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3584
3585                 if (!session || !conn) {
3586                         err = -EINVAL;
3587                         break;
3588                 }
3589
3590                 ev->r.retcode = transport->bind_conn(session, conn,
3591                                                 ev->u.b_conn.transport_eph,
3592                                                 ev->u.b_conn.is_leading);
3593                 if (ev->r.retcode || !transport->ep_connect)
3594                         break;
3595
3596                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3597                 if (ep) {
3598                         ep->conn = conn;
3599
3600                         mutex_lock(&conn->ep_mutex);
3601                         conn->ep = ep;
3602                         mutex_unlock(&conn->ep_mutex);
3603                 } else
3604                         iscsi_cls_conn_printk(KERN_ERR, conn,
3605                                               "Could not set ep conn "
3606                                               "binding\n");
3607                 break;
3608         case ISCSI_UEVENT_SET_PARAM:
3609                 err = iscsi_set_param(transport, ev);
3610                 break;
3611         case ISCSI_UEVENT_START_CONN:
3612                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3613                 if (conn)
3614                         ev->r.retcode = transport->start_conn(conn);
3615                 else
3616                         err = -EINVAL;
3617                 break;
3618         case ISCSI_UEVENT_STOP_CONN:
3619                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3620                 if (conn)
3621                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3622                 else
3623                         err = -EINVAL;
3624                 break;
3625         case ISCSI_UEVENT_SEND_PDU:
3626                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3627
3628                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3629                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3630                         err = -EINVAL;
3631                         break;
3632                 }
3633
3634                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3635                 if (conn)
3636                         ev->r.retcode = transport->send_pdu(conn,
3637                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3638                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3639                                 ev->u.send_pdu.data_size);
3640                 else
3641                         err = -EINVAL;
3642                 break;
3643         case ISCSI_UEVENT_GET_STATS:
3644                 err = iscsi_if_get_stats(transport, nlh);
3645                 break;
3646         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3647         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3648         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3649         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3650                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3651                 break;
3652         case ISCSI_UEVENT_TGT_DSCVR:
3653                 err = iscsi_tgt_dscvr(transport, ev);
3654                 break;
3655         case ISCSI_UEVENT_SET_HOST_PARAM:
3656                 err = iscsi_set_host_param(transport, ev);
3657                 break;
3658         case ISCSI_UEVENT_PATH_UPDATE:
3659                 err = iscsi_set_path(transport, ev);
3660                 break;
3661         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3662                 err = iscsi_set_iface_params(transport, ev,
3663                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3664                 break;
3665         case ISCSI_UEVENT_PING:
3666                 err = iscsi_send_ping(transport, ev);
3667                 break;
3668         case ISCSI_UEVENT_GET_CHAP:
3669                 err = iscsi_get_chap(transport, nlh);
3670                 break;
3671         case ISCSI_UEVENT_DELETE_CHAP:
3672                 err = iscsi_delete_chap(transport, ev);
3673                 break;
3674         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3675                 err = iscsi_set_flashnode_param(transport, ev,
3676                                                 nlmsg_attrlen(nlh,
3677                                                               sizeof(*ev)));
3678                 break;
3679         case ISCSI_UEVENT_NEW_FLASHNODE:
3680                 err = iscsi_new_flashnode(transport, ev,
3681                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3682                 break;
3683         case ISCSI_UEVENT_DEL_FLASHNODE:
3684                 err = iscsi_del_flashnode(transport, ev);
3685                 break;
3686         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3687                 err = iscsi_login_flashnode(transport, ev);
3688                 break;
3689         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3690                 err = iscsi_logout_flashnode(transport, ev);
3691                 break;
3692         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3693                 err = iscsi_logout_flashnode_sid(transport, ev);
3694                 break;
3695         case ISCSI_UEVENT_SET_CHAP:
3696                 err = iscsi_set_chap(transport, ev,
3697                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3698                 break;
3699         case ISCSI_UEVENT_GET_HOST_STATS:
3700                 err = iscsi_get_host_stats(transport, nlh);
3701                 break;
3702         default:
3703                 err = -ENOSYS;
3704                 break;
3705         }
3706
3707         module_put(transport->owner);
3708         return err;
3709 }
3710
3711 /*
3712  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3713  * Malformed skbs with wrong lengths or invalid creds are not processed.
3714  */
3715 static void
3716 iscsi_if_rx(struct sk_buff *skb)
3717 {
3718         u32 portid = NETLINK_CB(skb).portid;
3719
3720         mutex_lock(&rx_queue_mutex);
3721         while (skb->len >= NLMSG_HDRLEN) {
3722                 int err;
3723                 uint32_t rlen;
3724                 struct nlmsghdr *nlh;
3725                 struct iscsi_uevent *ev;
3726                 uint32_t group;
3727                 int retries = ISCSI_SEND_MAX_ALLOWED;
3728
3729                 nlh = nlmsg_hdr(skb);
3730                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3731                     skb->len < nlh->nlmsg_len) {
3732                         break;
3733                 }
3734
3735                 ev = nlmsg_data(nlh);
3736                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3737                 if (rlen > skb->len)
3738                         rlen = skb->len;
3739
3740                 err = iscsi_if_recv_msg(skb, nlh, &group);
3741                 if (err) {
3742                         ev->type = ISCSI_KEVENT_IF_ERROR;
3743                         ev->iferror = err;
3744                 }
3745                 do {
3746                         /*
3747                          * special case for GET_STATS:
3748                          * on success - sending reply and stats from
3749                          * inside of if_recv_msg(),
3750                          * on error - fall through.
3751                          */
3752                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3753                                 break;
3754                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3755                                 break;
3756                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3757                                                   ev, sizeof(*ev));
3758                         if (err == -EAGAIN && --retries < 0) {
3759                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3760                                 break;
3761                         }
3762                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3763                 skb_pull(skb, rlen);
3764         }
3765         mutex_unlock(&rx_queue_mutex);
3766 }
3767
3768 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3769 struct device_attribute dev_attr_##_prefix##_##_name =  \
3770         __ATTR(_name,_mode,_show,_store)
3771
3772 /*
3773  * iSCSI connection attrs
3774  */
3775 #define iscsi_conn_attr_show(param)                                     \
3776 static ssize_t                                                          \
3777 show_conn_param_##param(struct device *dev,                             \
3778                         struct device_attribute *attr, char *buf)       \
3779 {                                                                       \
3780         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3781         struct iscsi_transport *t = conn->transport;                    \
3782         return t->get_conn_param(conn, param, buf);                     \
3783 }
3784
3785 #define iscsi_conn_attr(field, param)                                   \
3786         iscsi_conn_attr_show(param)                                     \
3787 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3788                         NULL);
3789
3790 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3791 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3792 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3793 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3794 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3795 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3796 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3797 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3798 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3799 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3800 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3801 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3802 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3803 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3804 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3805 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3806 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3807 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3808 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3809 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3810 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3811 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3812 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3813 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3814 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3815 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3816 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3817 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3818
3819
3820 #define iscsi_conn_ep_attr_show(param)                                  \
3821 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3822                                           struct device_attribute *attr,\
3823                                           char *buf)                    \
3824 {                                                                       \
3825         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3826         struct iscsi_transport *t = conn->transport;                    \
3827         struct iscsi_endpoint *ep;                                      \
3828         ssize_t rc;                                                     \
3829                                                                         \
3830         /*                                                              \
3831          * Need to make sure ep_disconnect does not free the LLD's      \
3832          * interconnect resources while we are trying to read them.     \
3833          */                                                             \
3834         mutex_lock(&conn->ep_mutex);                                    \
3835         ep = conn->ep;                                                  \
3836         if (!ep && t->ep_connect) {                                     \
3837                 mutex_unlock(&conn->ep_mutex);                          \
3838                 return -ENOTCONN;                                       \
3839         }                                                               \
3840                                                                         \
3841         if (ep)                                                         \
3842                 rc = t->get_ep_param(ep, param, buf);                   \
3843         else                                                            \
3844                 rc = t->get_conn_param(conn, param, buf);               \
3845         mutex_unlock(&conn->ep_mutex);                                  \
3846         return rc;                                                      \
3847 }
3848
3849 #define iscsi_conn_ep_attr(field, param)                                \
3850         iscsi_conn_ep_attr_show(param)                                  \
3851 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3852                         show_conn_ep_param_##param, NULL);
3853
3854 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3855 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3856
3857 static struct attribute *iscsi_conn_attrs[] = {
3858         &dev_attr_conn_max_recv_dlength.attr,
3859         &dev_attr_conn_max_xmit_dlength.attr,
3860         &dev_attr_conn_header_digest.attr,
3861         &dev_attr_conn_data_digest.attr,
3862         &dev_attr_conn_ifmarker.attr,
3863         &dev_attr_conn_ofmarker.attr,
3864         &dev_attr_conn_address.attr,
3865         &dev_attr_conn_port.attr,
3866         &dev_attr_conn_exp_statsn.attr,
3867         &dev_attr_conn_persistent_address.attr,
3868         &dev_attr_conn_persistent_port.attr,
3869         &dev_attr_conn_ping_tmo.attr,
3870         &dev_attr_conn_recv_tmo.attr,
3871         &dev_attr_conn_local_port.attr,
3872         &dev_attr_conn_statsn.attr,
3873         &dev_attr_conn_keepalive_tmo.attr,
3874         &dev_attr_conn_max_segment_size.attr,
3875         &dev_attr_conn_tcp_timestamp_stat.attr,
3876         &dev_attr_conn_tcp_wsf_disable.attr,
3877         &dev_attr_conn_tcp_nagle_disable.attr,
3878         &dev_attr_conn_tcp_timer_scale.attr,
3879         &dev_attr_conn_tcp_timestamp_enable.attr,
3880         &dev_attr_conn_fragment_disable.attr,
3881         &dev_attr_conn_ipv4_tos.attr,
3882         &dev_attr_conn_ipv6_traffic_class.attr,
3883         &dev_attr_conn_ipv6_flow_label.attr,
3884         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3885         &dev_attr_conn_tcp_xmit_wsf.attr,
3886         &dev_attr_conn_tcp_recv_wsf.attr,
3887         &dev_attr_conn_local_ipaddr.attr,
3888         NULL,
3889 };
3890
3891 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3892                                          struct attribute *attr, int i)
3893 {
3894         struct device *cdev = container_of(kobj, struct device, kobj);
3895         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3896         struct iscsi_transport *t = conn->transport;
3897         int param;
3898
3899         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3900                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3901         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3902                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3903         else if (attr == &dev_attr_conn_header_digest.attr)
3904                 param = ISCSI_PARAM_HDRDGST_EN;
3905         else if (attr == &dev_attr_conn_data_digest.attr)
3906                 param = ISCSI_PARAM_DATADGST_EN;
3907         else if (attr == &dev_attr_conn_ifmarker.attr)
3908                 param = ISCSI_PARAM_IFMARKER_EN;
3909         else if (attr == &dev_attr_conn_ofmarker.attr)
3910                 param = ISCSI_PARAM_OFMARKER_EN;
3911         else if (attr == &dev_attr_conn_address.attr)
3912                 param = ISCSI_PARAM_CONN_ADDRESS;
3913         else if (attr == &dev_attr_conn_port.attr)
3914                 param = ISCSI_PARAM_CONN_PORT;
3915         else if (attr == &dev_attr_conn_exp_statsn.attr)
3916                 param = ISCSI_PARAM_EXP_STATSN;
3917         else if (attr == &dev_attr_conn_persistent_address.attr)
3918                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3919         else if (attr == &dev_attr_conn_persistent_port.attr)
3920                 param = ISCSI_PARAM_PERSISTENT_PORT;
3921         else if (attr == &dev_attr_conn_ping_tmo.attr)
3922                 param = ISCSI_PARAM_PING_TMO;
3923         else if (attr == &dev_attr_conn_recv_tmo.attr)
3924                 param = ISCSI_PARAM_RECV_TMO;
3925         else if (attr == &dev_attr_conn_local_port.attr)
3926                 param = ISCSI_PARAM_LOCAL_PORT;
3927         else if (attr == &dev_attr_conn_statsn.attr)
3928                 param = ISCSI_PARAM_STATSN;
3929         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3930                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3931         else if (attr == &dev_attr_conn_max_segment_size.attr)
3932                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3933         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3934                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3935         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3936                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3937         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3938                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3939         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3940                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3941         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3942                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3943         else if (attr == &dev_attr_conn_fragment_disable.attr)
3944                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3945         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3946                 param = ISCSI_PARAM_IPV4_TOS;
3947         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3948                 param = ISCSI_PARAM_IPV6_TC;
3949         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3950                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3951         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3952                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3953         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3954                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3955         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3956                 param = ISCSI_PARAM_TCP_RECV_WSF;
3957         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3958                 param = ISCSI_PARAM_LOCAL_IPADDR;
3959         else {
3960                 WARN_ONCE(1, "Invalid conn attr");
3961                 return 0;
3962         }
3963
3964         return t->attr_is_visible(ISCSI_PARAM, param);
3965 }
3966
3967 static struct attribute_group iscsi_conn_group = {
3968         .attrs = iscsi_conn_attrs,
3969         .is_visible = iscsi_conn_attr_is_visible,
3970 };
3971
3972 /*
3973  * iSCSI session attrs
3974  */
3975 #define iscsi_session_attr_show(param, perm)                            \
3976 static ssize_t                                                          \
3977 show_session_param_##param(struct device *dev,                          \
3978                            struct device_attribute *attr, char *buf)    \
3979 {                                                                       \
3980         struct iscsi_cls_session *session =                             \
3981                 iscsi_dev_to_session(dev->parent);                      \
3982         struct iscsi_transport *t = session->transport;                 \
3983                                                                         \
3984         if (perm && !capable(CAP_SYS_ADMIN))                            \
3985                 return -EACCES;                                         \
3986         return t->get_session_param(session, param, buf);               \
3987 }
3988
3989 #define iscsi_session_attr(field, param, perm)                          \
3990         iscsi_session_attr_show(param, perm)                            \
3991 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3992                         NULL);
3993 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3994 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3995 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3996 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3997 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3998 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3999 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4000 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4001 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4002 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4003 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4004 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4005 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4006 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4007 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4008 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4009 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4010 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4011 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4012 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4013 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4014 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4015 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4016 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4017 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4018 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4019 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4020 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4021 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4022 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4023 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4024 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4025 iscsi_session_attr(discovery_auth_optional,
4026                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4027 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4028 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4029 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4030 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4031 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4032 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4033 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4034
4035 static ssize_t
4036 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4037                         char *buf)
4038 {
4039         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4040         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4041 }
4042 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4043                         NULL);
4044 static ssize_t
4045 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4046                         char *buf)
4047 {
4048         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4049         return sysfs_emit(buf, "%d\n", session->creator);
4050 }
4051 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4052                         NULL);
4053 static ssize_t
4054 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4055                             char *buf)
4056 {
4057         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4058         return sysfs_emit(buf, "%d\n", session->target_id);
4059 }
4060 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4061                         show_priv_session_target_id, NULL);
4062
4063 #define iscsi_priv_session_attr_show(field, format)                     \
4064 static ssize_t                                                          \
4065 show_priv_session_##field(struct device *dev,                           \
4066                           struct device_attribute *attr, char *buf)     \
4067 {                                                                       \
4068         struct iscsi_cls_session *session =                             \
4069                         iscsi_dev_to_session(dev->parent);              \
4070         if (session->field == -1)                                       \
4071                 return sysfs_emit(buf, "off\n");                        \
4072         return sysfs_emit(buf, format"\n", session->field);             \
4073 }
4074
4075 #define iscsi_priv_session_attr_store(field)                            \
4076 static ssize_t                                                          \
4077 store_priv_session_##field(struct device *dev,                          \
4078                            struct device_attribute *attr,               \
4079                            const char *buf, size_t count)               \
4080 {                                                                       \
4081         int val;                                                        \
4082         char *cp;                                                       \
4083         struct iscsi_cls_session *session =                             \
4084                 iscsi_dev_to_session(dev->parent);                      \
4085         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4086             (session->state == ISCSI_SESSION_FAILED))                   \
4087                 return -EBUSY;                                          \
4088         if (strncmp(buf, "off", 3) == 0) {                              \
4089                 session->field = -1;                                    \
4090                 session->field##_sysfs_override = true;                 \
4091         } else {                                                        \
4092                 val = simple_strtoul(buf, &cp, 0);                      \
4093                 if (*cp != '\0' && *cp != '\n')                         \
4094                         return -EINVAL;                                 \
4095                 session->field = val;                                   \
4096                 session->field##_sysfs_override = true;                 \
4097         }                                                               \
4098         return count;                                                   \
4099 }
4100
4101 #define iscsi_priv_session_rw_attr(field, format)                       \
4102         iscsi_priv_session_attr_show(field, format)                     \
4103         iscsi_priv_session_attr_store(field)                            \
4104 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4105                         show_priv_session_##field,                      \
4106                         store_priv_session_##field)
4107
4108 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4109
4110 static struct attribute *iscsi_session_attrs[] = {
4111         &dev_attr_sess_initial_r2t.attr,
4112         &dev_attr_sess_max_outstanding_r2t.attr,
4113         &dev_attr_sess_immediate_data.attr,
4114         &dev_attr_sess_first_burst_len.attr,
4115         &dev_attr_sess_max_burst_len.attr,
4116         &dev_attr_sess_data_pdu_in_order.attr,
4117         &dev_attr_sess_data_seq_in_order.attr,
4118         &dev_attr_sess_erl.attr,
4119         &dev_attr_sess_targetname.attr,
4120         &dev_attr_sess_tpgt.attr,
4121         &dev_attr_sess_password.attr,
4122         &dev_attr_sess_password_in.attr,
4123         &dev_attr_sess_username.attr,
4124         &dev_attr_sess_username_in.attr,
4125         &dev_attr_sess_fast_abort.attr,
4126         &dev_attr_sess_abort_tmo.attr,
4127         &dev_attr_sess_lu_reset_tmo.attr,
4128         &dev_attr_sess_tgt_reset_tmo.attr,
4129         &dev_attr_sess_ifacename.attr,
4130         &dev_attr_sess_initiatorname.attr,
4131         &dev_attr_sess_targetalias.attr,
4132         &dev_attr_sess_boot_root.attr,
4133         &dev_attr_sess_boot_nic.attr,
4134         &dev_attr_sess_boot_target.attr,
4135         &dev_attr_priv_sess_recovery_tmo.attr,
4136         &dev_attr_priv_sess_state.attr,
4137         &dev_attr_priv_sess_creator.attr,
4138         &dev_attr_sess_chap_out_idx.attr,
4139         &dev_attr_sess_chap_in_idx.attr,
4140         &dev_attr_priv_sess_target_id.attr,
4141         &dev_attr_sess_auto_snd_tgt_disable.attr,
4142         &dev_attr_sess_discovery_session.attr,
4143         &dev_attr_sess_portal_type.attr,
4144         &dev_attr_sess_chap_auth.attr,
4145         &dev_attr_sess_discovery_logout.attr,
4146         &dev_attr_sess_bidi_chap.attr,
4147         &dev_attr_sess_discovery_auth_optional.attr,
4148         &dev_attr_sess_def_time2wait.attr,
4149         &dev_attr_sess_def_time2retain.attr,
4150         &dev_attr_sess_isid.attr,
4151         &dev_attr_sess_tsid.attr,
4152         &dev_attr_sess_def_taskmgmt_tmo.attr,
4153         &dev_attr_sess_discovery_parent_idx.attr,
4154         &dev_attr_sess_discovery_parent_type.attr,
4155         NULL,
4156 };
4157
4158 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4159                                             struct attribute *attr, int i)
4160 {
4161         struct device *cdev = container_of(kobj, struct device, kobj);
4162         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4163         struct iscsi_transport *t = session->transport;
4164         int param;
4165
4166         if (attr == &dev_attr_sess_initial_r2t.attr)
4167                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4168         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4169                 param = ISCSI_PARAM_MAX_R2T;
4170         else if (attr == &dev_attr_sess_immediate_data.attr)
4171                 param = ISCSI_PARAM_IMM_DATA_EN;
4172         else if (attr == &dev_attr_sess_first_burst_len.attr)
4173                 param = ISCSI_PARAM_FIRST_BURST;
4174         else if (attr == &dev_attr_sess_max_burst_len.attr)
4175                 param = ISCSI_PARAM_MAX_BURST;
4176         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4177                 param = ISCSI_PARAM_PDU_INORDER_EN;
4178         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4179                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4180         else if (attr == &dev_attr_sess_erl.attr)
4181                 param = ISCSI_PARAM_ERL;
4182         else if (attr == &dev_attr_sess_targetname.attr)
4183                 param = ISCSI_PARAM_TARGET_NAME;
4184         else if (attr == &dev_attr_sess_tpgt.attr)
4185                 param = ISCSI_PARAM_TPGT;
4186         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4187                 param = ISCSI_PARAM_CHAP_IN_IDX;
4188         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4189                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4190         else if (attr == &dev_attr_sess_password.attr)
4191                 param = ISCSI_PARAM_USERNAME;
4192         else if (attr == &dev_attr_sess_password_in.attr)
4193                 param = ISCSI_PARAM_USERNAME_IN;
4194         else if (attr == &dev_attr_sess_username.attr)
4195                 param = ISCSI_PARAM_PASSWORD;
4196         else if (attr == &dev_attr_sess_username_in.attr)
4197                 param = ISCSI_PARAM_PASSWORD_IN;
4198         else if (attr == &dev_attr_sess_fast_abort.attr)
4199                 param = ISCSI_PARAM_FAST_ABORT;
4200         else if (attr == &dev_attr_sess_abort_tmo.attr)
4201                 param = ISCSI_PARAM_ABORT_TMO;
4202         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4203                 param = ISCSI_PARAM_LU_RESET_TMO;
4204         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4205                 param = ISCSI_PARAM_TGT_RESET_TMO;
4206         else if (attr == &dev_attr_sess_ifacename.attr)
4207                 param = ISCSI_PARAM_IFACE_NAME;
4208         else if (attr == &dev_attr_sess_initiatorname.attr)
4209                 param = ISCSI_PARAM_INITIATOR_NAME;
4210         else if (attr == &dev_attr_sess_targetalias.attr)
4211                 param = ISCSI_PARAM_TARGET_ALIAS;
4212         else if (attr == &dev_attr_sess_boot_root.attr)
4213                 param = ISCSI_PARAM_BOOT_ROOT;
4214         else if (attr == &dev_attr_sess_boot_nic.attr)
4215                 param = ISCSI_PARAM_BOOT_NIC;
4216         else if (attr == &dev_attr_sess_boot_target.attr)
4217                 param = ISCSI_PARAM_BOOT_TARGET;
4218         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4219                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4220         else if (attr == &dev_attr_sess_discovery_session.attr)
4221                 param = ISCSI_PARAM_DISCOVERY_SESS;
4222         else if (attr == &dev_attr_sess_portal_type.attr)
4223                 param = ISCSI_PARAM_PORTAL_TYPE;
4224         else if (attr == &dev_attr_sess_chap_auth.attr)
4225                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4226         else if (attr == &dev_attr_sess_discovery_logout.attr)
4227                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4228         else if (attr == &dev_attr_sess_bidi_chap.attr)
4229                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4230         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4231                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4232         else if (attr == &dev_attr_sess_def_time2wait.attr)
4233                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4234         else if (attr == &dev_attr_sess_def_time2retain.attr)
4235                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4236         else if (attr == &dev_attr_sess_isid.attr)
4237                 param = ISCSI_PARAM_ISID;
4238         else if (attr == &dev_attr_sess_tsid.attr)
4239                 param = ISCSI_PARAM_TSID;
4240         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4241                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4242         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4243                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4244         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4245                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4246         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4247                 return S_IRUGO | S_IWUSR;
4248         else if (attr == &dev_attr_priv_sess_state.attr)
4249                 return S_IRUGO;
4250         else if (attr == &dev_attr_priv_sess_creator.attr)
4251                 return S_IRUGO;
4252         else if (attr == &dev_attr_priv_sess_target_id.attr)
4253                 return S_IRUGO;
4254         else {
4255                 WARN_ONCE(1, "Invalid session attr");
4256                 return 0;
4257         }
4258
4259         return t->attr_is_visible(ISCSI_PARAM, param);
4260 }
4261
4262 static struct attribute_group iscsi_session_group = {
4263         .attrs = iscsi_session_attrs,
4264         .is_visible = iscsi_session_attr_is_visible,
4265 };
4266
4267 /*
4268  * iSCSI host attrs
4269  */
4270 #define iscsi_host_attr_show(param)                                     \
4271 static ssize_t                                                          \
4272 show_host_param_##param(struct device *dev,                             \
4273                         struct device_attribute *attr, char *buf)       \
4274 {                                                                       \
4275         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4276         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4277         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4278 }
4279
4280 #define iscsi_host_attr(field, param)                                   \
4281         iscsi_host_attr_show(param)                                     \
4282 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4283                         NULL);
4284
4285 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4286 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4287 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4288 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4289 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4290 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4291
4292 static struct attribute *iscsi_host_attrs[] = {
4293         &dev_attr_host_netdev.attr,
4294         &dev_attr_host_hwaddress.attr,
4295         &dev_attr_host_ipaddress.attr,
4296         &dev_attr_host_initiatorname.attr,
4297         &dev_attr_host_port_state.attr,
4298         &dev_attr_host_port_speed.attr,
4299         NULL,
4300 };
4301
4302 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4303                                          struct attribute *attr, int i)
4304 {
4305         struct device *cdev = container_of(kobj, struct device, kobj);
4306         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4307         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4308         int param;
4309
4310         if (attr == &dev_attr_host_netdev.attr)
4311                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4312         else if (attr == &dev_attr_host_hwaddress.attr)
4313                 param = ISCSI_HOST_PARAM_HWADDRESS;
4314         else if (attr == &dev_attr_host_ipaddress.attr)
4315                 param = ISCSI_HOST_PARAM_IPADDRESS;
4316         else if (attr == &dev_attr_host_initiatorname.attr)
4317                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4318         else if (attr == &dev_attr_host_port_state.attr)
4319                 param = ISCSI_HOST_PARAM_PORT_STATE;
4320         else if (attr == &dev_attr_host_port_speed.attr)
4321                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4322         else {
4323                 WARN_ONCE(1, "Invalid host attr");
4324                 return 0;
4325         }
4326
4327         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4328 }
4329
4330 static struct attribute_group iscsi_host_group = {
4331         .attrs = iscsi_host_attrs,
4332         .is_visible = iscsi_host_attr_is_visible,
4333 };
4334
4335 /* convert iscsi_port_speed values to ascii string name */
4336 static const struct {
4337         enum iscsi_port_speed   value;
4338         char                    *name;
4339 } iscsi_port_speed_names[] = {
4340         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4341         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4342         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4343         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4344         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4345         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4346         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4347 };
4348
4349 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4350 {
4351         int i;
4352         char *speed = "Unknown!";
4353         struct iscsi_cls_host *ihost = shost->shost_data;
4354         uint32_t port_speed = ihost->port_speed;
4355
4356         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4357                 if (iscsi_port_speed_names[i].value & port_speed) {
4358                         speed = iscsi_port_speed_names[i].name;
4359                         break;
4360                 }
4361         }
4362         return speed;
4363 }
4364 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4365
4366 /* convert iscsi_port_state values to ascii string name */
4367 static const struct {
4368         enum iscsi_port_state   value;
4369         char                    *name;
4370 } iscsi_port_state_names[] = {
4371         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4372         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4373 };
4374
4375 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4376 {
4377         int i;
4378         char *state = "Unknown!";
4379         struct iscsi_cls_host *ihost = shost->shost_data;
4380         uint32_t port_state = ihost->port_state;
4381
4382         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4383                 if (iscsi_port_state_names[i].value & port_state) {
4384                         state = iscsi_port_state_names[i].name;
4385                         break;
4386                 }
4387         }
4388         return state;
4389 }
4390 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4391
4392 static int iscsi_session_match(struct attribute_container *cont,
4393                            struct device *dev)
4394 {
4395         struct iscsi_cls_session *session;
4396         struct Scsi_Host *shost;
4397         struct iscsi_internal *priv;
4398
4399         if (!iscsi_is_session_dev(dev))
4400                 return 0;
4401
4402         session = iscsi_dev_to_session(dev);
4403         shost = iscsi_session_to_shost(session);
4404         if (!shost->transportt)
4405                 return 0;
4406
4407         priv = to_iscsi_internal(shost->transportt);
4408         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4409                 return 0;
4410
4411         return &priv->session_cont.ac == cont;
4412 }
4413
4414 static int iscsi_conn_match(struct attribute_container *cont,
4415                            struct device *dev)
4416 {
4417         struct iscsi_cls_session *session;
4418         struct iscsi_cls_conn *conn;
4419         struct Scsi_Host *shost;
4420         struct iscsi_internal *priv;
4421
4422         if (!iscsi_is_conn_dev(dev))
4423                 return 0;
4424
4425         conn = iscsi_dev_to_conn(dev);
4426         session = iscsi_dev_to_session(conn->dev.parent);
4427         shost = iscsi_session_to_shost(session);
4428
4429         if (!shost->transportt)
4430                 return 0;
4431
4432         priv = to_iscsi_internal(shost->transportt);
4433         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4434                 return 0;
4435
4436         return &priv->conn_cont.ac == cont;
4437 }
4438
4439 static int iscsi_host_match(struct attribute_container *cont,
4440                             struct device *dev)
4441 {
4442         struct Scsi_Host *shost;
4443         struct iscsi_internal *priv;
4444
4445         if (!scsi_is_host_device(dev))
4446                 return 0;
4447
4448         shost = dev_to_shost(dev);
4449         if (!shost->transportt  ||
4450             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4451                 return 0;
4452
4453         priv = to_iscsi_internal(shost->transportt);
4454         return &priv->t.host_attrs.ac == cont;
4455 }
4456
4457 struct scsi_transport_template *
4458 iscsi_register_transport(struct iscsi_transport *tt)
4459 {
4460         struct iscsi_internal *priv;
4461         unsigned long flags;
4462         int err;
4463
4464         BUG_ON(!tt);
4465
4466         priv = iscsi_if_transport_lookup(tt);
4467         if (priv)
4468                 return NULL;
4469
4470         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4471         if (!priv)
4472                 return NULL;
4473         INIT_LIST_HEAD(&priv->list);
4474         priv->iscsi_transport = tt;
4475         priv->t.user_scan = iscsi_user_scan;
4476         priv->t.create_work_queue = 1;
4477
4478         priv->dev.class = &iscsi_transport_class;
4479         dev_set_name(&priv->dev, "%s", tt->name);
4480         err = device_register(&priv->dev);
4481         if (err)
4482                 goto free_priv;
4483
4484         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4485         if (err)
4486                 goto unregister_dev;
4487
4488         /* host parameters */
4489         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4490         priv->t.host_attrs.ac.match = iscsi_host_match;
4491         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4492         priv->t.host_size = sizeof(struct iscsi_cls_host);
4493         transport_container_register(&priv->t.host_attrs);
4494
4495         /* connection parameters */
4496         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4497         priv->conn_cont.ac.match = iscsi_conn_match;
4498         priv->conn_cont.ac.grp = &iscsi_conn_group;
4499         transport_container_register(&priv->conn_cont);
4500
4501         /* session parameters */
4502         priv->session_cont.ac.class = &iscsi_session_class.class;
4503         priv->session_cont.ac.match = iscsi_session_match;
4504         priv->session_cont.ac.grp = &iscsi_session_group;
4505         transport_container_register(&priv->session_cont);
4506
4507         spin_lock_irqsave(&iscsi_transport_lock, flags);
4508         list_add(&priv->list, &iscsi_transports);
4509         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4510
4511         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4512         return &priv->t;
4513
4514 unregister_dev:
4515         device_unregister(&priv->dev);
4516         return NULL;
4517 free_priv:
4518         kfree(priv);
4519         return NULL;
4520 }
4521 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4522
4523 int iscsi_unregister_transport(struct iscsi_transport *tt)
4524 {
4525         struct iscsi_internal *priv;
4526         unsigned long flags;
4527
4528         BUG_ON(!tt);
4529
4530         mutex_lock(&rx_queue_mutex);
4531
4532         priv = iscsi_if_transport_lookup(tt);
4533         BUG_ON (!priv);
4534
4535         spin_lock_irqsave(&iscsi_transport_lock, flags);
4536         list_del(&priv->list);
4537         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4538
4539         transport_container_unregister(&priv->conn_cont);
4540         transport_container_unregister(&priv->session_cont);
4541         transport_container_unregister(&priv->t.host_attrs);
4542
4543         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4544         device_unregister(&priv->dev);
4545         mutex_unlock(&rx_queue_mutex);
4546
4547         return 0;
4548 }
4549 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4550
4551 static __init int iscsi_transport_init(void)
4552 {
4553         int err;
4554         struct netlink_kernel_cfg cfg = {
4555                 .groups = 1,
4556                 .input  = iscsi_if_rx,
4557         };
4558         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4559                 ISCSI_TRANSPORT_VERSION);
4560
4561         atomic_set(&iscsi_session_nr, 0);
4562
4563         err = class_register(&iscsi_transport_class);
4564         if (err)
4565                 return err;
4566
4567         err = class_register(&iscsi_endpoint_class);
4568         if (err)
4569                 goto unregister_transport_class;
4570
4571         err = class_register(&iscsi_iface_class);
4572         if (err)
4573                 goto unregister_endpoint_class;
4574
4575         err = transport_class_register(&iscsi_host_class);
4576         if (err)
4577                 goto unregister_iface_class;
4578
4579         err = transport_class_register(&iscsi_connection_class);
4580         if (err)
4581                 goto unregister_host_class;
4582
4583         err = transport_class_register(&iscsi_session_class);
4584         if (err)
4585                 goto unregister_conn_class;
4586
4587         err = bus_register(&iscsi_flashnode_bus);
4588         if (err)
4589                 goto unregister_session_class;
4590
4591         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4592         if (!nls) {
4593                 err = -ENOBUFS;
4594                 goto unregister_flashnode_bus;
4595         }
4596
4597         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4598         if (!iscsi_eh_timer_workq) {
4599                 err = -ENOMEM;
4600                 goto release_nls;
4601         }
4602
4603         return 0;
4604
4605 release_nls:
4606         netlink_kernel_release(nls);
4607 unregister_flashnode_bus:
4608         bus_unregister(&iscsi_flashnode_bus);
4609 unregister_session_class:
4610         transport_class_unregister(&iscsi_session_class);
4611 unregister_conn_class:
4612         transport_class_unregister(&iscsi_connection_class);
4613 unregister_host_class:
4614         transport_class_unregister(&iscsi_host_class);
4615 unregister_iface_class:
4616         class_unregister(&iscsi_iface_class);
4617 unregister_endpoint_class:
4618         class_unregister(&iscsi_endpoint_class);
4619 unregister_transport_class:
4620         class_unregister(&iscsi_transport_class);
4621         return err;
4622 }
4623
4624 static void __exit iscsi_transport_exit(void)
4625 {
4626         destroy_workqueue(iscsi_eh_timer_workq);
4627         netlink_kernel_release(nls);
4628         bus_unregister(&iscsi_flashnode_bus);
4629         transport_class_unregister(&iscsi_connection_class);
4630         transport_class_unregister(&iscsi_session_class);
4631         transport_class_unregister(&iscsi_host_class);
4632         class_unregister(&iscsi_endpoint_class);
4633         class_unregister(&iscsi_iface_class);
4634         class_unregister(&iscsi_transport_class);
4635 }
4636
4637 module_init(iscsi_transport_init);
4638 module_exit(iscsi_transport_exit);
4639
4640 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4641               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4642               "Alex Aizman <itn780@yahoo.com>");
4643 MODULE_DESCRIPTION("iSCSI Transport Interface");
4644 MODULE_LICENSE("GPL");
4645 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4646 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);