drivers/scsi/scsi_transport_iscsi.c

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