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 /*
1620  * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
1621  * against the kernel stop_connection recovery mechanism
1622  */
1623 static DEFINE_MUTEX(conn_mutex);
1624
1625 static LIST_HEAD(sesslist);
1626 static DEFINE_SPINLOCK(sesslock);
1627 static LIST_HEAD(connlist);
1628 static LIST_HEAD(connlist_err);
1629 static DEFINE_SPINLOCK(connlock);
1630
1631 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1632 {
1633         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1634         return sess->sid;
1635 }
1636
1637 /*
1638  * Returns the matching session to a given sid
1639  */
1640 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1641 {
1642         unsigned long flags;
1643         struct iscsi_cls_session *sess;
1644
1645         spin_lock_irqsave(&sesslock, flags);
1646         list_for_each_entry(sess, &sesslist, sess_list) {
1647                 if (sess->sid == sid) {
1648                         spin_unlock_irqrestore(&sesslock, flags);
1649                         return sess;
1650                 }
1651         }
1652         spin_unlock_irqrestore(&sesslock, flags);
1653         return NULL;
1654 }
1655
1656 /*
1657  * Returns the matching connection to a given sid / cid tuple
1658  */
1659 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1660 {
1661         unsigned long flags;
1662         struct iscsi_cls_conn *conn;
1663
1664         spin_lock_irqsave(&connlock, flags);
1665         list_for_each_entry(conn, &connlist, conn_list) {
1666                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1667                         spin_unlock_irqrestore(&connlock, flags);
1668                         return conn;
1669                 }
1670         }
1671         spin_unlock_irqrestore(&connlock, flags);
1672         return NULL;
1673 }
1674
1675 /*
1676  * The following functions can be used by LLDs that allocate
1677  * their own scsi_hosts or by software iscsi LLDs
1678  */
1679 static struct {
1680         int value;
1681         char *name;
1682 } iscsi_session_state_names[] = {
1683         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1684         { ISCSI_SESSION_FAILED,         "FAILED" },
1685         { ISCSI_SESSION_FREE,           "FREE" },
1686 };
1687
1688 static const char *iscsi_session_state_name(int state)
1689 {
1690         int i;
1691         char *name = NULL;
1692
1693         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1694                 if (iscsi_session_state_names[i].value == state) {
1695                         name = iscsi_session_state_names[i].name;
1696                         break;
1697                 }
1698         }
1699         return name;
1700 }
1701
1702 int iscsi_session_chkready(struct iscsi_cls_session *session)
1703 {
1704         int err;
1705
1706         switch (session->state) {
1707         case ISCSI_SESSION_LOGGED_IN:
1708                 err = 0;
1709                 break;
1710         case ISCSI_SESSION_FAILED:
1711                 err = DID_IMM_RETRY << 16;
1712                 break;
1713         case ISCSI_SESSION_FREE:
1714                 err = DID_TRANSPORT_FAILFAST << 16;
1715                 break;
1716         default:
1717                 err = DID_NO_CONNECT << 16;
1718                 break;
1719         }
1720         return err;
1721 }
1722 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1723
1724 int iscsi_is_session_online(struct iscsi_cls_session *session)
1725 {
1726         unsigned long flags;
1727         int ret = 0;
1728
1729         spin_lock_irqsave(&session->lock, flags);
1730         if (session->state == ISCSI_SESSION_LOGGED_IN)
1731                 ret = 1;
1732         spin_unlock_irqrestore(&session->lock, flags);
1733         return ret;
1734 }
1735 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1736
1737 static void iscsi_session_release(struct device *dev)
1738 {
1739         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1740         struct Scsi_Host *shost;
1741
1742         shost = iscsi_session_to_shost(session);
1743         scsi_host_put(shost);
1744         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1745         kfree(session);
1746 }
1747
1748 int iscsi_is_session_dev(const struct device *dev)
1749 {
1750         return dev->release == iscsi_session_release;
1751 }
1752 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1753
1754 static int iscsi_iter_session_fn(struct device *dev, void *data)
1755 {
1756         void (* fn) (struct iscsi_cls_session *) = data;
1757
1758         if (!iscsi_is_session_dev(dev))
1759                 return 0;
1760         fn(iscsi_dev_to_session(dev));
1761         return 0;
1762 }
1763
1764 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1765                                  void (*fn)(struct iscsi_cls_session *))
1766 {
1767         device_for_each_child(&shost->shost_gendev, fn,
1768                               iscsi_iter_session_fn);
1769 }
1770 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1771
1772 /**
1773  * iscsi_scan_finished - helper to report when running scans are done
1774  * @shost: scsi host
1775  * @time: scan run time
1776  *
1777  * This function can be used by drives like qla4xxx to report to the scsi
1778  * layer when the scans it kicked off at module load time are done.
1779  */
1780 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1781 {
1782         struct iscsi_cls_host *ihost = shost->shost_data;
1783         /*
1784          * qla4xxx will have kicked off some session unblocks before calling
1785          * scsi_scan_host, so just wait for them to complete.
1786          */
1787         return !atomic_read(&ihost->nr_scans);
1788 }
1789 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1790
1791 struct iscsi_scan_data {
1792         unsigned int channel;
1793         unsigned int id;
1794         u64 lun;
1795         enum scsi_scan_mode rescan;
1796 };
1797
1798 static int iscsi_user_scan_session(struct device *dev, void *data)
1799 {
1800         struct iscsi_scan_data *scan_data = data;
1801         struct iscsi_cls_session *session;
1802         struct Scsi_Host *shost;
1803         struct iscsi_cls_host *ihost;
1804         unsigned long flags;
1805         unsigned int id;
1806
1807         if (!iscsi_is_session_dev(dev))
1808                 return 0;
1809
1810         session = iscsi_dev_to_session(dev);
1811
1812         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1813
1814         shost = iscsi_session_to_shost(session);
1815         ihost = shost->shost_data;
1816
1817         mutex_lock(&ihost->mutex);
1818         spin_lock_irqsave(&session->lock, flags);
1819         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1820                 spin_unlock_irqrestore(&session->lock, flags);
1821                 goto user_scan_exit;
1822         }
1823         id = session->target_id;
1824         spin_unlock_irqrestore(&session->lock, flags);
1825
1826         if (id != ISCSI_MAX_TARGET) {
1827                 if ((scan_data->channel == SCAN_WILD_CARD ||
1828                      scan_data->channel == 0) &&
1829                     (scan_data->id == SCAN_WILD_CARD ||
1830                      scan_data->id == id))
1831                         scsi_scan_target(&session->dev, 0, id,
1832                                          scan_data->lun, scan_data->rescan);
1833         }
1834
1835 user_scan_exit:
1836         mutex_unlock(&ihost->mutex);
1837         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1838         return 0;
1839 }
1840
1841 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1842                            uint id, u64 lun)
1843 {
1844         struct iscsi_scan_data scan_data;
1845
1846         scan_data.channel = channel;
1847         scan_data.id = id;
1848         scan_data.lun = lun;
1849         scan_data.rescan = SCSI_SCAN_MANUAL;
1850
1851         return device_for_each_child(&shost->shost_gendev, &scan_data,
1852                                      iscsi_user_scan_session);
1853 }
1854
1855 static void iscsi_scan_session(struct work_struct *work)
1856 {
1857         struct iscsi_cls_session *session =
1858                         container_of(work, struct iscsi_cls_session, scan_work);
1859         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1860         struct iscsi_cls_host *ihost = shost->shost_data;
1861         struct iscsi_scan_data scan_data;
1862
1863         scan_data.channel = 0;
1864         scan_data.id = SCAN_WILD_CARD;
1865         scan_data.lun = SCAN_WILD_CARD;
1866         scan_data.rescan = SCSI_SCAN_RESCAN;
1867
1868         iscsi_user_scan_session(&session->dev, &scan_data);
1869         atomic_dec(&ihost->nr_scans);
1870 }
1871
1872 /**
1873  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1874  * @cmd: scsi cmd passed to scsi eh handler
1875  *
1876  * If the session is down this function will wait for the recovery
1877  * timer to fire or for the session to be logged back in. If the
1878  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1879  * should pass this error value to the scsi eh.
1880  */
1881 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1882 {
1883         struct iscsi_cls_session *session =
1884                         starget_to_session(scsi_target(cmd->device));
1885         unsigned long flags;
1886         int ret = 0;
1887
1888         spin_lock_irqsave(&session->lock, flags);
1889         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1890                 if (session->state == ISCSI_SESSION_FREE) {
1891                         ret = FAST_IO_FAIL;
1892                         break;
1893                 }
1894                 spin_unlock_irqrestore(&session->lock, flags);
1895                 msleep(1000);
1896                 spin_lock_irqsave(&session->lock, flags);
1897         }
1898         spin_unlock_irqrestore(&session->lock, flags);
1899         return ret;
1900 }
1901 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1902
1903 static void session_recovery_timedout(struct work_struct *work)
1904 {
1905         struct iscsi_cls_session *session =
1906                 container_of(work, struct iscsi_cls_session,
1907                              recovery_work.work);
1908         unsigned long flags;
1909
1910         iscsi_cls_session_printk(KERN_INFO, session,
1911                                  "session recovery timed out after %d secs\n",
1912                                  session->recovery_tmo);
1913
1914         spin_lock_irqsave(&session->lock, flags);
1915         switch (session->state) {
1916         case ISCSI_SESSION_FAILED:
1917                 session->state = ISCSI_SESSION_FREE;
1918                 break;
1919         case ISCSI_SESSION_LOGGED_IN:
1920         case ISCSI_SESSION_FREE:
1921                 /* we raced with the unblock's flush */
1922                 spin_unlock_irqrestore(&session->lock, flags);
1923                 return;
1924         }
1925         spin_unlock_irqrestore(&session->lock, flags);
1926
1927         if (session->transport->session_recovery_timedout)
1928                 session->transport->session_recovery_timedout(session);
1929
1930         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1931         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1932         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1933 }
1934
1935 static void __iscsi_unblock_session(struct work_struct *work)
1936 {
1937         struct iscsi_cls_session *session =
1938                         container_of(work, struct iscsi_cls_session,
1939                                      unblock_work);
1940         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1941         struct iscsi_cls_host *ihost = shost->shost_data;
1942         unsigned long flags;
1943
1944         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1945         /*
1946          * The recovery and unblock work get run from the same workqueue,
1947          * so try to cancel it if it was going to run after this unblock.
1948          */
1949         cancel_delayed_work(&session->recovery_work);
1950         spin_lock_irqsave(&session->lock, flags);
1951         session->state = ISCSI_SESSION_LOGGED_IN;
1952         spin_unlock_irqrestore(&session->lock, flags);
1953         /* start IO */
1954         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1955         /*
1956          * Only do kernel scanning if the driver is properly hooked into
1957          * the async scanning code (drivers like iscsi_tcp do login and
1958          * scanning from userspace).
1959          */
1960         if (shost->hostt->scan_finished) {
1961                 if (scsi_queue_work(shost, &session->scan_work))
1962                         atomic_inc(&ihost->nr_scans);
1963         }
1964         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1965 }
1966
1967 /**
1968  * iscsi_unblock_session - set a session as logged in and start IO.
1969  * @session: iscsi session
1970  *
1971  * Mark a session as ready to accept IO.
1972  */
1973 void iscsi_unblock_session(struct iscsi_cls_session *session)
1974 {
1975         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1976         /*
1977          * Blocking the session can be done from any context so we only
1978          * queue the block work. Make sure the unblock work has completed
1979          * because it flushes/cancels the other works and updates the state.
1980          */
1981         flush_work(&session->unblock_work);
1982 }
1983 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1984
1985 static void __iscsi_block_session(struct work_struct *work)
1986 {
1987         struct iscsi_cls_session *session =
1988                         container_of(work, struct iscsi_cls_session,
1989                                      block_work);
1990         unsigned long flags;
1991
1992         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1993         spin_lock_irqsave(&session->lock, flags);
1994         session->state = ISCSI_SESSION_FAILED;
1995         spin_unlock_irqrestore(&session->lock, flags);
1996         scsi_target_block(&session->dev);
1997         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1998         if (session->recovery_tmo >= 0)
1999                 queue_delayed_work(iscsi_eh_timer_workq,
2000                                    &session->recovery_work,
2001                                    session->recovery_tmo * HZ);
2002 }
2003
2004 void iscsi_block_session(struct iscsi_cls_session *session)
2005 {
2006         queue_work(iscsi_eh_timer_workq, &session->block_work);
2007 }
2008 EXPORT_SYMBOL_GPL(iscsi_block_session);
2009
2010 static void __iscsi_unbind_session(struct work_struct *work)
2011 {
2012         struct iscsi_cls_session *session =
2013                         container_of(work, struct iscsi_cls_session,
2014                                      unbind_work);
2015         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2016         struct iscsi_cls_host *ihost = shost->shost_data;
2017         unsigned long flags;
2018         unsigned int target_id;
2019
2020         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2021
2022         /* Prevent new scans and make sure scanning is not in progress */
2023         mutex_lock(&ihost->mutex);
2024         spin_lock_irqsave(&session->lock, flags);
2025         if (session->target_id == ISCSI_MAX_TARGET) {
2026                 spin_unlock_irqrestore(&session->lock, flags);
2027                 mutex_unlock(&ihost->mutex);
2028                 goto unbind_session_exit;
2029         }
2030
2031         target_id = session->target_id;
2032         session->target_id = ISCSI_MAX_TARGET;
2033         spin_unlock_irqrestore(&session->lock, flags);
2034         mutex_unlock(&ihost->mutex);
2035
2036         scsi_remove_target(&session->dev);
2037
2038         if (session->ida_used)
2039                 ida_simple_remove(&iscsi_sess_ida, target_id);
2040
2041 unbind_session_exit:
2042         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2043         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2044 }
2045
2046 static void __iscsi_destroy_session(struct work_struct *work)
2047 {
2048         struct iscsi_cls_session *session =
2049                 container_of(work, struct iscsi_cls_session, destroy_work);
2050
2051         session->transport->destroy_session(session);
2052 }
2053
2054 struct iscsi_cls_session *
2055 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2056                     int dd_size)
2057 {
2058         struct iscsi_cls_session *session;
2059
2060         session = kzalloc(sizeof(*session) + dd_size,
2061                           GFP_KERNEL);
2062         if (!session)
2063                 return NULL;
2064
2065         session->transport = transport;
2066         session->creator = -1;
2067         session->recovery_tmo = 120;
2068         session->recovery_tmo_sysfs_override = false;
2069         session->state = ISCSI_SESSION_FREE;
2070         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2071         INIT_LIST_HEAD(&session->sess_list);
2072         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2073         INIT_WORK(&session->block_work, __iscsi_block_session);
2074         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2075         INIT_WORK(&session->scan_work, iscsi_scan_session);
2076         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2077         spin_lock_init(&session->lock);
2078
2079         /* this is released in the dev's release function */
2080         scsi_host_get(shost);
2081         session->dev.parent = &shost->shost_gendev;
2082         session->dev.release = iscsi_session_release;
2083         device_initialize(&session->dev);
2084         if (dd_size)
2085                 session->dd_data = &session[1];
2086
2087         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2088         return session;
2089 }
2090 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2091
2092 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2093 {
2094         unsigned long flags;
2095         int id = 0;
2096         int err;
2097
2098         session->sid = atomic_add_return(1, &iscsi_session_nr);
2099
2100         if (target_id == ISCSI_MAX_TARGET) {
2101                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2102
2103                 if (id < 0) {
2104                         iscsi_cls_session_printk(KERN_ERR, session,
2105                                         "Failure in Target ID Allocation\n");
2106                         return id;
2107                 }
2108                 session->target_id = (unsigned int)id;
2109                 session->ida_used = true;
2110         } else
2111                 session->target_id = target_id;
2112
2113         dev_set_name(&session->dev, "session%u", session->sid);
2114         err = device_add(&session->dev);
2115         if (err) {
2116                 iscsi_cls_session_printk(KERN_ERR, session,
2117                                          "could not register session's dev\n");
2118                 goto release_ida;
2119         }
2120         err = transport_register_device(&session->dev);
2121         if (err) {
2122                 iscsi_cls_session_printk(KERN_ERR, session,
2123                                          "could not register transport's dev\n");
2124                 goto release_dev;
2125         }
2126
2127         spin_lock_irqsave(&sesslock, flags);
2128         list_add(&session->sess_list, &sesslist);
2129         spin_unlock_irqrestore(&sesslock, flags);
2130
2131         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2132         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2133         return 0;
2134
2135 release_dev:
2136         device_del(&session->dev);
2137 release_ida:
2138         if (session->ida_used)
2139                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2140
2141         return err;
2142 }
2143 EXPORT_SYMBOL_GPL(iscsi_add_session);
2144
2145 /**
2146  * iscsi_create_session - create iscsi class session
2147  * @shost: scsi host
2148  * @transport: iscsi transport
2149  * @dd_size: private driver data size
2150  * @target_id: which target
2151  *
2152  * This can be called from a LLD or iscsi_transport.
2153  */
2154 struct iscsi_cls_session *
2155 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2156                      int dd_size, unsigned int target_id)
2157 {
2158         struct iscsi_cls_session *session;
2159
2160         session = iscsi_alloc_session(shost, transport, dd_size);
2161         if (!session)
2162                 return NULL;
2163
2164         if (iscsi_add_session(session, target_id)) {
2165                 iscsi_free_session(session);
2166                 return NULL;
2167         }
2168         return session;
2169 }
2170 EXPORT_SYMBOL_GPL(iscsi_create_session);
2171
2172 static void iscsi_conn_release(struct device *dev)
2173 {
2174         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2175         struct device *parent = conn->dev.parent;
2176
2177         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2178         kfree(conn);
2179         put_device(parent);
2180 }
2181
2182 static int iscsi_is_conn_dev(const struct device *dev)
2183 {
2184         return dev->release == iscsi_conn_release;
2185 }
2186
2187 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2188 {
2189         if (!iscsi_is_conn_dev(dev))
2190                 return 0;
2191         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2192 }
2193
2194 void iscsi_remove_session(struct iscsi_cls_session *session)
2195 {
2196         unsigned long flags;
2197         int err;
2198
2199         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2200
2201         spin_lock_irqsave(&sesslock, flags);
2202         if (!list_empty(&session->sess_list))
2203                 list_del(&session->sess_list);
2204         spin_unlock_irqrestore(&sesslock, flags);
2205
2206         flush_work(&session->block_work);
2207         flush_work(&session->unblock_work);
2208         cancel_delayed_work_sync(&session->recovery_work);
2209         /*
2210          * If we are blocked let commands flow again. The lld or iscsi
2211          * layer should set up the queuecommand to fail commands.
2212          * We assume that LLD will not be calling block/unblock while
2213          * removing the session.
2214          */
2215         spin_lock_irqsave(&session->lock, flags);
2216         session->state = ISCSI_SESSION_FREE;
2217         spin_unlock_irqrestore(&session->lock, flags);
2218
2219         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2220         /* flush running scans then delete devices */
2221         flush_work(&session->scan_work);
2222         /* flush running unbind operations */
2223         flush_work(&session->unbind_work);
2224         __iscsi_unbind_session(&session->unbind_work);
2225
2226         /* hw iscsi may not have removed all connections from session */
2227         err = device_for_each_child(&session->dev, NULL,
2228                                     iscsi_iter_destroy_conn_fn);
2229         if (err)
2230                 iscsi_cls_session_printk(KERN_ERR, session,
2231                                          "Could not delete all connections "
2232                                          "for session. Error %d.\n", err);
2233
2234         transport_unregister_device(&session->dev);
2235
2236         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2237         device_del(&session->dev);
2238 }
2239 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2240
2241 void iscsi_free_session(struct iscsi_cls_session *session)
2242 {
2243         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2244         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2245         put_device(&session->dev);
2246 }
2247 EXPORT_SYMBOL_GPL(iscsi_free_session);
2248
2249 /**
2250  * iscsi_create_conn - create iscsi class connection
2251  * @session: iscsi cls session
2252  * @dd_size: private driver data size
2253  * @cid: connection id
2254  *
2255  * This can be called from a LLD or iscsi_transport. The connection
2256  * is child of the session so cid must be unique for all connections
2257  * on the session.
2258  *
2259  * Since we do not support MCS, cid will normally be zero. In some cases
2260  * for software iscsi we could be trying to preallocate a connection struct
2261  * in which case there could be two connection structs and cid would be
2262  * non-zero.
2263  */
2264 struct iscsi_cls_conn *
2265 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2266 {
2267         struct iscsi_transport *transport = session->transport;
2268         struct iscsi_cls_conn *conn;
2269         unsigned long flags;
2270         int err;
2271
2272         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2273         if (!conn)
2274                 return NULL;
2275         if (dd_size)
2276                 conn->dd_data = &conn[1];
2277
2278         mutex_init(&conn->ep_mutex);
2279         INIT_LIST_HEAD(&conn->conn_list);
2280         INIT_LIST_HEAD(&conn->conn_list_err);
2281         conn->transport = transport;
2282         conn->cid = cid;
2283         conn->state = ISCSI_CONN_DOWN;
2284
2285         /* this is released in the dev's release function */
2286         if (!get_device(&session->dev))
2287                 goto free_conn;
2288
2289         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2290         conn->dev.parent = &session->dev;
2291         conn->dev.release = iscsi_conn_release;
2292         err = device_register(&conn->dev);
2293         if (err) {
2294                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2295                                          "register connection's dev\n");
2296                 goto release_parent_ref;
2297         }
2298         err = transport_register_device(&conn->dev);
2299         if (err) {
2300                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2301                                          "register transport's dev\n");
2302                 goto release_conn_ref;
2303         }
2304
2305         spin_lock_irqsave(&connlock, flags);
2306         list_add(&conn->conn_list, &connlist);
2307         spin_unlock_irqrestore(&connlock, flags);
2308
2309         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2310         return conn;
2311
2312 release_conn_ref:
2313         device_unregister(&conn->dev);
2314         put_device(&session->dev);
2315         return NULL;
2316 release_parent_ref:
2317         put_device(&session->dev);
2318 free_conn:
2319         kfree(conn);
2320         return NULL;
2321 }
2322
2323 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2324
2325 /**
2326  * iscsi_destroy_conn - destroy iscsi class connection
2327  * @conn: iscsi cls session
2328  *
2329  * This can be called from a LLD or iscsi_transport.
2330  */
2331 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2332 {
2333         unsigned long flags;
2334
2335         spin_lock_irqsave(&connlock, flags);
2336         list_del(&conn->conn_list);
2337         list_del(&conn->conn_list_err);
2338         spin_unlock_irqrestore(&connlock, flags);
2339
2340         transport_unregister_device(&conn->dev);
2341         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2342         device_unregister(&conn->dev);
2343         return 0;
2344 }
2345 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2346
2347 /*
2348  * iscsi interface functions
2349  */
2350 static struct iscsi_internal *
2351 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2352 {
2353         struct iscsi_internal *priv;
2354         unsigned long flags;
2355
2356         spin_lock_irqsave(&iscsi_transport_lock, flags);
2357         list_for_each_entry(priv, &iscsi_transports, list) {
2358                 if (tt == priv->iscsi_transport) {
2359                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2360                         return priv;
2361                 }
2362         }
2363         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2364         return NULL;
2365 }
2366
2367 static int
2368 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2369 {
2370         return nlmsg_multicast(nls, skb, 0, group, gfp);
2371 }
2372
2373 static int
2374 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2375 {
2376         return nlmsg_unicast(nls, skb, portid);
2377 }
2378
2379 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2380                    char *data, uint32_t data_size)
2381 {
2382         struct nlmsghdr *nlh;
2383         struct sk_buff *skb;
2384         struct iscsi_uevent *ev;
2385         char *pdu;
2386         struct iscsi_internal *priv;
2387         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2388                                    data_size);
2389
2390         priv = iscsi_if_transport_lookup(conn->transport);
2391         if (!priv)
2392                 return -EINVAL;
2393
2394         skb = alloc_skb(len, GFP_ATOMIC);
2395         if (!skb) {
2396                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2397                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2398                                       "control PDU: OOM\n");
2399                 return -ENOMEM;
2400         }
2401
2402         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2403         ev = nlmsg_data(nlh);
2404         memset(ev, 0, sizeof(*ev));
2405         ev->transport_handle = iscsi_handle(conn->transport);
2406         ev->type = ISCSI_KEVENT_RECV_PDU;
2407         ev->r.recv_req.cid = conn->cid;
2408         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2409         pdu = (char*)ev + sizeof(*ev);
2410         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2411         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2412
2413         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2414 }
2415 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2416
2417 int iscsi_offload_mesg(struct Scsi_Host *shost,
2418                        struct iscsi_transport *transport, uint32_t type,
2419                        char *data, uint16_t data_size)
2420 {
2421         struct nlmsghdr *nlh;
2422         struct sk_buff *skb;
2423         struct iscsi_uevent *ev;
2424         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2425
2426         skb = alloc_skb(len, GFP_ATOMIC);
2427         if (!skb) {
2428                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2429                 return -ENOMEM;
2430         }
2431
2432         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2433         ev = nlmsg_data(nlh);
2434         memset(ev, 0, sizeof(*ev));
2435         ev->type = type;
2436         ev->transport_handle = iscsi_handle(transport);
2437         switch (type) {
2438         case ISCSI_KEVENT_PATH_REQ:
2439                 ev->r.req_path.host_no = shost->host_no;
2440                 break;
2441         case ISCSI_KEVENT_IF_DOWN:
2442                 ev->r.notify_if_down.host_no = shost->host_no;
2443                 break;
2444         }
2445
2446         memcpy((char *)ev + sizeof(*ev), data, data_size);
2447
2448         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2449 }
2450 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2451
2452 /*
2453  * This can be called without the rx_queue_mutex, if invoked by the kernel
2454  * stop work. But, in that case, it is guaranteed not to race with
2455  * iscsi_destroy by conn_mutex.
2456  */
2457 static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2458 {
2459         /*
2460          * It is important that this path doesn't rely on
2461          * rx_queue_mutex, otherwise, a thread doing allocation on a
2462          * start_session/start_connection could sleep waiting on a
2463          * writeback to a failed iscsi device, that cannot be recovered
2464          * because the lock is held.  If we don't hold it here, the
2465          * kernel stop_conn_work_fn has a chance to stop the broken
2466          * session and resolve the allocation.
2467          *
2468          * Still, the user invoked .stop_conn() needs to be serialized
2469          * with stop_conn_work_fn by a private mutex.  Not pretty, but
2470          * it works.
2471          */
2472         mutex_lock(&conn_mutex);
2473         conn->transport->stop_conn(conn, flag);
2474         mutex_unlock(&conn_mutex);
2475
2476 }
2477
2478 static void stop_conn_work_fn(struct work_struct *work)
2479 {
2480         struct iscsi_cls_conn *conn, *tmp;
2481         unsigned long flags;
2482         LIST_HEAD(recovery_list);
2483
2484         spin_lock_irqsave(&connlock, flags);
2485         if (list_empty(&connlist_err)) {
2486                 spin_unlock_irqrestore(&connlock, flags);
2487                 return;
2488         }
2489         list_splice_init(&connlist_err, &recovery_list);
2490         spin_unlock_irqrestore(&connlock, flags);
2491
2492         list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2493                 uint32_t sid = iscsi_conn_get_sid(conn);
2494                 struct iscsi_cls_session *session;
2495
2496                 session = iscsi_session_lookup(sid);
2497                 if (session) {
2498                         if (system_state != SYSTEM_RUNNING) {
2499                                 session->recovery_tmo = 0;
2500                                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2501                         } else {
2502                                 iscsi_if_stop_conn(conn, STOP_CONN_RECOVER);
2503                         }
2504                 }
2505
2506                 list_del_init(&conn->conn_list_err);
2507         }
2508 }
2509
2510 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2511 {
2512         struct nlmsghdr *nlh;
2513         struct sk_buff  *skb;
2514         struct iscsi_uevent *ev;
2515         struct iscsi_internal *priv;
2516         int len = nlmsg_total_size(sizeof(*ev));
2517         unsigned long flags;
2518
2519         spin_lock_irqsave(&connlock, flags);
2520         list_add(&conn->conn_list_err, &connlist_err);
2521         spin_unlock_irqrestore(&connlock, flags);
2522         queue_work(system_unbound_wq, &stop_conn_work);
2523
2524         priv = iscsi_if_transport_lookup(conn->transport);
2525         if (!priv)
2526                 return;
2527
2528         skb = alloc_skb(len, GFP_ATOMIC);
2529         if (!skb) {
2530                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2531                                       "conn error (%d)\n", error);
2532                 return;
2533         }
2534
2535         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2536         ev = nlmsg_data(nlh);
2537         ev->transport_handle = iscsi_handle(conn->transport);
2538         ev->type = ISCSI_KEVENT_CONN_ERROR;
2539         ev->r.connerror.error = error;
2540         ev->r.connerror.cid = conn->cid;
2541         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2542
2543         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2544
2545         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2546                               error);
2547 }
2548 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2549
2550 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2551                             enum iscsi_conn_state state)
2552 {
2553         struct nlmsghdr *nlh;
2554         struct sk_buff  *skb;
2555         struct iscsi_uevent *ev;
2556         struct iscsi_internal *priv;
2557         int len = nlmsg_total_size(sizeof(*ev));
2558
2559         priv = iscsi_if_transport_lookup(conn->transport);
2560         if (!priv)
2561                 return;
2562
2563         skb = alloc_skb(len, GFP_ATOMIC);
2564         if (!skb) {
2565                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2566                                       "conn login (%d)\n", state);
2567                 return;
2568         }
2569
2570         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2571         ev = nlmsg_data(nlh);
2572         ev->transport_handle = iscsi_handle(conn->transport);
2573         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2574         ev->r.conn_login.state = state;
2575         ev->r.conn_login.cid = conn->cid;
2576         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2577         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2578
2579         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2580                               state);
2581 }
2582 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2583
2584 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2585                            enum iscsi_host_event_code code, uint32_t data_size,
2586                            uint8_t *data)
2587 {
2588         struct nlmsghdr *nlh;
2589         struct sk_buff *skb;
2590         struct iscsi_uevent *ev;
2591         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2592
2593         skb = alloc_skb(len, GFP_NOIO);
2594         if (!skb) {
2595                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2596                        host_no, code);
2597                 return;
2598         }
2599
2600         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2601         ev = nlmsg_data(nlh);
2602         ev->transport_handle = iscsi_handle(transport);
2603         ev->type = ISCSI_KEVENT_HOST_EVENT;
2604         ev->r.host_event.host_no = host_no;
2605         ev->r.host_event.code = code;
2606         ev->r.host_event.data_size = data_size;
2607
2608         if (data_size)
2609                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2610
2611         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2612 }
2613 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2614
2615 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2616                            uint32_t status, uint32_t pid, uint32_t data_size,
2617                            uint8_t *data)
2618 {
2619         struct nlmsghdr *nlh;
2620         struct sk_buff *skb;
2621         struct iscsi_uevent *ev;
2622         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2623
2624         skb = alloc_skb(len, GFP_NOIO);
2625         if (!skb) {
2626                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2627                 return;
2628         }
2629
2630         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2631         ev = nlmsg_data(nlh);
2632         ev->transport_handle = iscsi_handle(transport);
2633         ev->type = ISCSI_KEVENT_PING_COMP;
2634         ev->r.ping_comp.host_no = host_no;
2635         ev->r.ping_comp.status = status;
2636         ev->r.ping_comp.pid = pid;
2637         ev->r.ping_comp.data_size = data_size;
2638         memcpy((char *)ev + sizeof(*ev), data, data_size);
2639
2640         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2641 }
2642 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2643
2644 static int
2645 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2646 {
2647         struct sk_buff  *skb;
2648         struct nlmsghdr *nlh;
2649         int len = nlmsg_total_size(size);
2650
2651         skb = alloc_skb(len, GFP_ATOMIC);
2652         if (!skb) {
2653                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2654                 return -ENOMEM;
2655         }
2656
2657         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2658         memcpy(nlmsg_data(nlh), payload, size);
2659         return iscsi_unicast_skb(skb, portid);
2660 }
2661
2662 static int
2663 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2664 {
2665         struct iscsi_uevent *ev = nlmsg_data(nlh);
2666         struct iscsi_stats *stats;
2667         struct sk_buff *skbstat;
2668         struct iscsi_cls_conn *conn;
2669         struct nlmsghdr *nlhstat;
2670         struct iscsi_uevent *evstat;
2671         struct iscsi_internal *priv;
2672         int len = nlmsg_total_size(sizeof(*ev) +
2673                                    sizeof(struct iscsi_stats) +
2674                                    sizeof(struct iscsi_stats_custom) *
2675                                    ISCSI_STATS_CUSTOM_MAX);
2676         int err = 0;
2677
2678         priv = iscsi_if_transport_lookup(transport);
2679         if (!priv)
2680                 return -EINVAL;
2681
2682         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2683         if (!conn)
2684                 return -EEXIST;
2685
2686         do {
2687                 int actual_size;
2688
2689                 skbstat = alloc_skb(len, GFP_ATOMIC);
2690                 if (!skbstat) {
2691                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2692                                               "deliver stats: OOM\n");
2693                         return -ENOMEM;
2694                 }
2695
2696                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2697                                       (len - sizeof(*nlhstat)), 0);
2698                 evstat = nlmsg_data(nlhstat);
2699                 memset(evstat, 0, sizeof(*evstat));
2700                 evstat->transport_handle = iscsi_handle(conn->transport);
2701                 evstat->type = nlh->nlmsg_type;
2702                 evstat->u.get_stats.cid =
2703                         ev->u.get_stats.cid;
2704                 evstat->u.get_stats.sid =
2705                         ev->u.get_stats.sid;
2706                 stats = (struct iscsi_stats *)
2707                         ((char*)evstat + sizeof(*evstat));
2708                 memset(stats, 0, sizeof(*stats));
2709
2710                 transport->get_stats(conn, stats);
2711                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2712                                                sizeof(struct iscsi_stats) +
2713                                                sizeof(struct iscsi_stats_custom) *
2714                                                stats->custom_length);
2715                 actual_size -= sizeof(*nlhstat);
2716                 actual_size = nlmsg_msg_size(actual_size);
2717                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2718                 nlhstat->nlmsg_len = actual_size;
2719
2720                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2721                                           GFP_ATOMIC);
2722         } while (err < 0 && err != -ECONNREFUSED);
2723
2724         return err;
2725 }
2726
2727 /**
2728  * iscsi_session_event - send session destr. completion event
2729  * @session: iscsi class session
2730  * @event: type of event
2731  */
2732 int iscsi_session_event(struct iscsi_cls_session *session,
2733                         enum iscsi_uevent_e event)
2734 {
2735         struct iscsi_internal *priv;
2736         struct Scsi_Host *shost;
2737         struct iscsi_uevent *ev;
2738         struct sk_buff  *skb;
2739         struct nlmsghdr *nlh;
2740         int rc, len = nlmsg_total_size(sizeof(*ev));
2741
2742         priv = iscsi_if_transport_lookup(session->transport);
2743         if (!priv)
2744                 return -EINVAL;
2745         shost = iscsi_session_to_shost(session);
2746
2747         skb = alloc_skb(len, GFP_KERNEL);
2748         if (!skb) {
2749                 iscsi_cls_session_printk(KERN_ERR, session,
2750                                          "Cannot notify userspace of session "
2751                                          "event %u\n", event);
2752                 return -ENOMEM;
2753         }
2754
2755         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2756         ev = nlmsg_data(nlh);
2757         ev->transport_handle = iscsi_handle(session->transport);
2758
2759         ev->type = event;
2760         switch (event) {
2761         case ISCSI_KEVENT_DESTROY_SESSION:
2762                 ev->r.d_session.host_no = shost->host_no;
2763                 ev->r.d_session.sid = session->sid;
2764                 break;
2765         case ISCSI_KEVENT_CREATE_SESSION:
2766                 ev->r.c_session_ret.host_no = shost->host_no;
2767                 ev->r.c_session_ret.sid = session->sid;
2768                 break;
2769         case ISCSI_KEVENT_UNBIND_SESSION:
2770                 ev->r.unbind_session.host_no = shost->host_no;
2771                 ev->r.unbind_session.sid = session->sid;
2772                 break;
2773         default:
2774                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2775                                          "%u.\n", event);
2776                 kfree_skb(skb);
2777                 return -EINVAL;
2778         }
2779
2780         /*
2781          * this will occur if the daemon is not up, so we just warn
2782          * the user and when the daemon is restarted it will handle it
2783          */
2784         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2785         if (rc == -ESRCH)
2786                 iscsi_cls_session_printk(KERN_ERR, session,
2787                                          "Cannot notify userspace of session "
2788                                          "event %u. Check iscsi daemon\n",
2789                                          event);
2790
2791         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2792                                 event, rc);
2793         return rc;
2794 }
2795 EXPORT_SYMBOL_GPL(iscsi_session_event);
2796
2797 static int
2798 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2799                         struct iscsi_uevent *ev, pid_t pid,
2800                         uint32_t initial_cmdsn, uint16_t cmds_max,
2801                         uint16_t queue_depth)
2802 {
2803         struct iscsi_transport *transport = priv->iscsi_transport;
2804         struct iscsi_cls_session *session;
2805         struct Scsi_Host *shost;
2806
2807         session = transport->create_session(ep, cmds_max, queue_depth,
2808                                             initial_cmdsn);
2809         if (!session)
2810                 return -ENOMEM;
2811
2812         session->creator = pid;
2813         shost = iscsi_session_to_shost(session);
2814         ev->r.c_session_ret.host_no = shost->host_no;
2815         ev->r.c_session_ret.sid = session->sid;
2816         ISCSI_DBG_TRANS_SESSION(session,
2817                                 "Completed creating transport session\n");
2818         return 0;
2819 }
2820
2821 static int
2822 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2823 {
2824         struct iscsi_cls_conn *conn;
2825         struct iscsi_cls_session *session;
2826
2827         session = iscsi_session_lookup(ev->u.c_conn.sid);
2828         if (!session) {
2829                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2830                        ev->u.c_conn.sid);
2831                 return -EINVAL;
2832         }
2833
2834         conn = transport->create_conn(session, ev->u.c_conn.cid);
2835         if (!conn) {
2836                 iscsi_cls_session_printk(KERN_ERR, session,
2837                                          "couldn't create a new connection.");
2838                 return -ENOMEM;
2839         }
2840
2841         ev->r.c_conn_ret.sid = session->sid;
2842         ev->r.c_conn_ret.cid = conn->cid;
2843
2844         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2845         return 0;
2846 }
2847
2848 static int
2849 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2850 {
2851         struct iscsi_cls_conn *conn;
2852         unsigned long flags;
2853
2854         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2855         if (!conn)
2856                 return -EINVAL;
2857
2858         spin_lock_irqsave(&connlock, flags);
2859         if (!list_empty(&conn->conn_list_err)) {
2860                 spin_unlock_irqrestore(&connlock, flags);
2861                 return -EAGAIN;
2862         }
2863         spin_unlock_irqrestore(&connlock, flags);
2864
2865         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2866
2867         mutex_lock(&conn_mutex);
2868         if (transport->destroy_conn)
2869                 transport->destroy_conn(conn);
2870         mutex_unlock(&conn_mutex);
2871
2872         return 0;
2873 }
2874
2875 static int
2876 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2877 {
2878         char *data = (char*)ev + sizeof(*ev);
2879         struct iscsi_cls_conn *conn;
2880         struct iscsi_cls_session *session;
2881         int err = 0, value = 0;
2882
2883         session = iscsi_session_lookup(ev->u.set_param.sid);
2884         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2885         if (!conn || !session)
2886                 return -EINVAL;
2887
2888         switch (ev->u.set_param.param) {
2889         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2890                 sscanf(data, "%d", &value);
2891                 if (!session->recovery_tmo_sysfs_override)
2892                         session->recovery_tmo = value;
2893                 break;
2894         default:
2895                 err = transport->set_param(conn, ev->u.set_param.param,
2896                                            data, ev->u.set_param.len);
2897         }
2898
2899         return err;
2900 }
2901
2902 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2903                                struct iscsi_uevent *ev, int msg_type)
2904 {
2905         struct iscsi_endpoint *ep;
2906         struct sockaddr *dst_addr;
2907         struct Scsi_Host *shost = NULL;
2908         int non_blocking, err = 0;
2909
2910         if (!transport->ep_connect)
2911                 return -EINVAL;
2912
2913         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2914                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2915                 if (!shost) {
2916                         printk(KERN_ERR "ep connect failed. Could not find "
2917                                "host no %u\n",
2918                                ev->u.ep_connect_through_host.host_no);
2919                         return -ENODEV;
2920                 }
2921                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2922         } else
2923                 non_blocking = ev->u.ep_connect.non_blocking;
2924
2925         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2926         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2927         if (IS_ERR(ep)) {
2928                 err = PTR_ERR(ep);
2929                 goto release_host;
2930         }
2931
2932         ev->r.ep_connect_ret.handle = ep->id;
2933 release_host:
2934         if (shost)
2935                 scsi_host_put(shost);
2936         return err;
2937 }
2938
2939 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2940                                   u64 ep_handle)
2941 {
2942         struct iscsi_cls_conn *conn;
2943         struct iscsi_endpoint *ep;
2944
2945         if (!transport->ep_disconnect)
2946                 return -EINVAL;
2947
2948         ep = iscsi_lookup_endpoint(ep_handle);
2949         if (!ep)
2950                 return -EINVAL;
2951         conn = ep->conn;
2952         if (conn) {
2953                 mutex_lock(&conn->ep_mutex);
2954                 conn->ep = NULL;
2955                 mutex_unlock(&conn->ep_mutex);
2956         }
2957
2958         transport->ep_disconnect(ep);
2959         return 0;
2960 }
2961
2962 static int
2963 iscsi_if_transport_ep(struct iscsi_transport *transport,
2964                       struct iscsi_uevent *ev, int msg_type)
2965 {
2966         struct iscsi_endpoint *ep;
2967         int rc = 0;
2968
2969         switch (msg_type) {
2970         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2971         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2972                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2973                 break;
2974         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2975                 if (!transport->ep_poll)
2976                         return -EINVAL;
2977
2978                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2979                 if (!ep)
2980                         return -EINVAL;
2981
2982                 ev->r.retcode = transport->ep_poll(ep,
2983                                                    ev->u.ep_poll.timeout_ms);
2984                 break;
2985         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2986                 rc = iscsi_if_ep_disconnect(transport,
2987                                             ev->u.ep_disconnect.ep_handle);
2988                 break;
2989         }
2990         return rc;
2991 }
2992
2993 static int
2994 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2995                 struct iscsi_uevent *ev)
2996 {
2997         struct Scsi_Host *shost;
2998         struct sockaddr *dst_addr;
2999         int err;
3000
3001         if (!transport->tgt_dscvr)
3002                 return -EINVAL;
3003
3004         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3005         if (!shost) {
3006                 printk(KERN_ERR "target discovery could not find host no %u\n",
3007                        ev->u.tgt_dscvr.host_no);
3008                 return -ENODEV;
3009         }
3010
3011
3012         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3013         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3014                                    ev->u.tgt_dscvr.enable, dst_addr);
3015         scsi_host_put(shost);
3016         return err;
3017 }
3018
3019 static int
3020 iscsi_set_host_param(struct iscsi_transport *transport,
3021                      struct iscsi_uevent *ev)
3022 {
3023         char *data = (char*)ev + sizeof(*ev);
3024         struct Scsi_Host *shost;
3025         int err;
3026
3027         if (!transport->set_host_param)
3028                 return -ENOSYS;
3029
3030         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3031         if (!shost) {
3032                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3033                        ev->u.set_host_param.host_no);
3034                 return -ENODEV;
3035         }
3036
3037         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3038                                         data, ev->u.set_host_param.len);
3039         scsi_host_put(shost);
3040         return err;
3041 }
3042
3043 static int
3044 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3045 {
3046         struct Scsi_Host *shost;
3047         struct iscsi_path *params;
3048         int err;
3049
3050         if (!transport->set_path)
3051                 return -ENOSYS;
3052
3053         shost = scsi_host_lookup(ev->u.set_path.host_no);
3054         if (!shost) {
3055                 printk(KERN_ERR "set path could not find host no %u\n",
3056                        ev->u.set_path.host_no);
3057                 return -ENODEV;
3058         }
3059
3060         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3061         err = transport->set_path(shost, params);
3062
3063         scsi_host_put(shost);
3064         return err;
3065 }
3066
3067 static int iscsi_session_has_conns(int sid)
3068 {
3069         struct iscsi_cls_conn *conn;
3070         unsigned long flags;
3071         int found = 0;
3072
3073         spin_lock_irqsave(&connlock, flags);
3074         list_for_each_entry(conn, &connlist, conn_list) {
3075                 if (iscsi_conn_get_sid(conn) == sid) {
3076                         found = 1;
3077                         break;
3078                 }
3079         }
3080         spin_unlock_irqrestore(&connlock, flags);
3081
3082         return found;
3083 }
3084
3085 static int
3086 iscsi_set_iface_params(struct iscsi_transport *transport,
3087                        struct iscsi_uevent *ev, uint32_t len)
3088 {
3089         char *data = (char *)ev + sizeof(*ev);
3090         struct Scsi_Host *shost;
3091         int err;
3092
3093         if (!transport->set_iface_param)
3094                 return -ENOSYS;
3095
3096         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3097         if (!shost) {
3098                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3099                        ev->u.set_iface_params.host_no);
3100                 return -ENODEV;
3101         }
3102
3103         err = transport->set_iface_param(shost, data, len);
3104         scsi_host_put(shost);
3105         return err;
3106 }
3107
3108 static int
3109 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3110 {
3111         struct Scsi_Host *shost;
3112         struct sockaddr *dst_addr;
3113         int err;
3114
3115         if (!transport->send_ping)
3116                 return -ENOSYS;
3117
3118         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3119         if (!shost) {
3120                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3121                        ev->u.iscsi_ping.host_no);
3122                 return -ENODEV;
3123         }
3124
3125         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3126         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3127                                    ev->u.iscsi_ping.iface_type,
3128                                    ev->u.iscsi_ping.payload_size,
3129                                    ev->u.iscsi_ping.pid,
3130                                    dst_addr);
3131         scsi_host_put(shost);
3132         return err;
3133 }
3134
3135 static int
3136 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3137 {
3138         struct iscsi_uevent *ev = nlmsg_data(nlh);
3139         struct Scsi_Host *shost = NULL;
3140         struct iscsi_chap_rec *chap_rec;
3141         struct iscsi_internal *priv;
3142         struct sk_buff *skbchap;
3143         struct nlmsghdr *nlhchap;
3144         struct iscsi_uevent *evchap;
3145         uint32_t chap_buf_size;
3146         int len, err = 0;
3147         char *buf;
3148
3149         if (!transport->get_chap)
3150                 return -EINVAL;
3151
3152         priv = iscsi_if_transport_lookup(transport);
3153         if (!priv)
3154                 return -EINVAL;
3155
3156         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3157         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3158
3159         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3160         if (!shost) {
3161                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3162                        __func__, ev->u.get_chap.host_no);
3163                 return -ENODEV;
3164         }
3165
3166         do {
3167                 int actual_size;
3168
3169                 skbchap = alloc_skb(len, GFP_KERNEL);
3170                 if (!skbchap) {
3171                         printk(KERN_ERR "can not deliver chap: OOM\n");
3172                         err = -ENOMEM;
3173                         goto exit_get_chap;
3174                 }
3175
3176                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3177                                       (len - sizeof(*nlhchap)), 0);
3178                 evchap = nlmsg_data(nlhchap);
3179                 memset(evchap, 0, sizeof(*evchap));
3180                 evchap->transport_handle = iscsi_handle(transport);
3181                 evchap->type = nlh->nlmsg_type;
3182                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3183                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3184                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3185                 buf = (char *)evchap + sizeof(*evchap);
3186                 memset(buf, 0, chap_buf_size);
3187
3188                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3189                                     &evchap->u.get_chap.num_entries, buf);
3190
3191                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3192                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3193                 nlhchap->nlmsg_len = actual_size;
3194
3195                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3196                                           GFP_KERNEL);
3197         } while (err < 0 && err != -ECONNREFUSED);
3198
3199 exit_get_chap:
3200         scsi_host_put(shost);
3201         return err;
3202 }
3203
3204 static int iscsi_set_chap(struct iscsi_transport *transport,
3205                           struct iscsi_uevent *ev, uint32_t len)
3206 {
3207         char *data = (char *)ev + sizeof(*ev);
3208         struct Scsi_Host *shost;
3209         int err = 0;
3210
3211         if (!transport->set_chap)
3212                 return -ENOSYS;
3213
3214         shost = scsi_host_lookup(ev->u.set_path.host_no);
3215         if (!shost) {
3216                 pr_err("%s could not find host no %u\n",
3217                        __func__, ev->u.set_path.host_no);
3218                 return -ENODEV;
3219         }
3220
3221         err = transport->set_chap(shost, data, len);
3222         scsi_host_put(shost);
3223         return err;
3224 }
3225
3226 static int iscsi_delete_chap(struct iscsi_transport *transport,
3227                              struct iscsi_uevent *ev)
3228 {
3229         struct Scsi_Host *shost;
3230         int err = 0;
3231
3232         if (!transport->delete_chap)
3233                 return -ENOSYS;
3234
3235         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3236         if (!shost) {
3237                 printk(KERN_ERR "%s could not find host no %u\n",
3238                        __func__, ev->u.delete_chap.host_no);
3239                 return -ENODEV;
3240         }
3241
3242         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3243         scsi_host_put(shost);
3244         return err;
3245 }
3246
3247 static const struct {
3248         enum iscsi_discovery_parent_type value;
3249         char                            *name;
3250 } iscsi_discovery_parent_names[] = {
3251         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3252         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3253         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3254 };
3255
3256 char *iscsi_get_discovery_parent_name(int parent_type)
3257 {
3258         int i;
3259         char *state = "Unknown!";
3260
3261         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3262                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3263                         state = iscsi_discovery_parent_names[i].name;
3264                         break;
3265                 }
3266         }
3267         return state;
3268 }
3269 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3270
3271 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3272                                      struct iscsi_uevent *ev, uint32_t len)
3273 {
3274         char *data = (char *)ev + sizeof(*ev);
3275         struct Scsi_Host *shost;
3276         struct iscsi_bus_flash_session *fnode_sess;
3277         struct iscsi_bus_flash_conn *fnode_conn;
3278         struct device *dev;
3279         uint32_t idx;
3280         int err = 0;
3281
3282         if (!transport->set_flashnode_param) {
3283                 err = -ENOSYS;
3284                 goto exit_set_fnode;
3285         }
3286
3287         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3288         if (!shost) {
3289                 pr_err("%s could not find host no %u\n",
3290                        __func__, ev->u.set_flashnode.host_no);
3291                 err = -ENODEV;
3292                 goto exit_set_fnode;
3293         }
3294
3295         idx = ev->u.set_flashnode.flashnode_idx;
3296         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3297         if (!fnode_sess) {
3298                 pr_err("%s could not find flashnode %u for host no %u\n",
3299                        __func__, idx, ev->u.set_flashnode.host_no);
3300                 err = -ENODEV;
3301                 goto put_host;
3302         }
3303
3304         dev = iscsi_find_flashnode_conn(fnode_sess);
3305         if (!dev) {
3306                 err = -ENODEV;
3307                 goto put_sess;
3308         }
3309
3310         fnode_conn = iscsi_dev_to_flash_conn(dev);
3311         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3312         put_device(dev);
3313
3314 put_sess:
3315         put_device(&fnode_sess->dev);
3316
3317 put_host:
3318         scsi_host_put(shost);
3319
3320 exit_set_fnode:
3321         return err;
3322 }
3323
3324 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3325                                struct iscsi_uevent *ev, uint32_t len)
3326 {
3327         char *data = (char *)ev + sizeof(*ev);
3328         struct Scsi_Host *shost;
3329         int index;
3330         int err = 0;
3331
3332         if (!transport->new_flashnode) {
3333                 err = -ENOSYS;
3334                 goto exit_new_fnode;
3335         }
3336
3337         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3338         if (!shost) {
3339                 pr_err("%s could not find host no %u\n",
3340                        __func__, ev->u.new_flashnode.host_no);
3341                 err = -ENODEV;
3342                 goto put_host;
3343         }
3344
3345         index = transport->new_flashnode(shost, data, len);
3346
3347         if (index >= 0)
3348                 ev->r.new_flashnode_ret.flashnode_idx = index;
3349         else
3350                 err = -EIO;
3351
3352 put_host:
3353         scsi_host_put(shost);
3354
3355 exit_new_fnode:
3356         return err;
3357 }
3358
3359 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3360                                struct iscsi_uevent *ev)
3361 {
3362         struct Scsi_Host *shost;
3363         struct iscsi_bus_flash_session *fnode_sess;
3364         uint32_t idx;
3365         int err = 0;
3366
3367         if (!transport->del_flashnode) {
3368                 err = -ENOSYS;
3369                 goto exit_del_fnode;
3370         }
3371
3372         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3373         if (!shost) {
3374                 pr_err("%s could not find host no %u\n",
3375                        __func__, ev->u.del_flashnode.host_no);
3376                 err = -ENODEV;
3377                 goto put_host;
3378         }
3379
3380         idx = ev->u.del_flashnode.flashnode_idx;
3381         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3382         if (!fnode_sess) {
3383                 pr_err("%s could not find flashnode %u for host no %u\n",
3384                        __func__, idx, ev->u.del_flashnode.host_no);
3385                 err = -ENODEV;
3386                 goto put_host;
3387         }
3388
3389         err = transport->del_flashnode(fnode_sess);
3390         put_device(&fnode_sess->dev);
3391
3392 put_host:
3393         scsi_host_put(shost);
3394
3395 exit_del_fnode:
3396         return err;
3397 }
3398
3399 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3400                                  struct iscsi_uevent *ev)
3401 {
3402         struct Scsi_Host *shost;
3403         struct iscsi_bus_flash_session *fnode_sess;
3404         struct iscsi_bus_flash_conn *fnode_conn;
3405         struct device *dev;
3406         uint32_t idx;
3407         int err = 0;
3408
3409         if (!transport->login_flashnode) {
3410                 err = -ENOSYS;
3411                 goto exit_login_fnode;
3412         }
3413
3414         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3415         if (!shost) {
3416                 pr_err("%s could not find host no %u\n",
3417                        __func__, ev->u.login_flashnode.host_no);
3418                 err = -ENODEV;
3419                 goto put_host;
3420         }
3421
3422         idx = ev->u.login_flashnode.flashnode_idx;
3423         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3424         if (!fnode_sess) {
3425                 pr_err("%s could not find flashnode %u for host no %u\n",
3426                        __func__, idx, ev->u.login_flashnode.host_no);
3427                 err = -ENODEV;
3428                 goto put_host;
3429         }
3430
3431         dev = iscsi_find_flashnode_conn(fnode_sess);
3432         if (!dev) {
3433                 err = -ENODEV;
3434                 goto put_sess;
3435         }
3436
3437         fnode_conn = iscsi_dev_to_flash_conn(dev);
3438         err = transport->login_flashnode(fnode_sess, fnode_conn);
3439         put_device(dev);
3440
3441 put_sess:
3442         put_device(&fnode_sess->dev);
3443
3444 put_host:
3445         scsi_host_put(shost);
3446
3447 exit_login_fnode:
3448         return err;
3449 }
3450
3451 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3452                                   struct iscsi_uevent *ev)
3453 {
3454         struct Scsi_Host *shost;
3455         struct iscsi_bus_flash_session *fnode_sess;
3456         struct iscsi_bus_flash_conn *fnode_conn;
3457         struct device *dev;
3458         uint32_t idx;
3459         int err = 0;
3460
3461         if (!transport->logout_flashnode) {
3462                 err = -ENOSYS;
3463                 goto exit_logout_fnode;
3464         }
3465
3466         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3467         if (!shost) {
3468                 pr_err("%s could not find host no %u\n",
3469                        __func__, ev->u.logout_flashnode.host_no);
3470                 err = -ENODEV;
3471                 goto put_host;
3472         }
3473
3474         idx = ev->u.logout_flashnode.flashnode_idx;
3475         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3476         if (!fnode_sess) {
3477                 pr_err("%s could not find flashnode %u for host no %u\n",
3478                        __func__, idx, ev->u.logout_flashnode.host_no);
3479                 err = -ENODEV;
3480                 goto put_host;
3481         }
3482
3483         dev = iscsi_find_flashnode_conn(fnode_sess);
3484         if (!dev) {
3485                 err = -ENODEV;
3486                 goto put_sess;
3487         }
3488
3489         fnode_conn = iscsi_dev_to_flash_conn(dev);
3490
3491         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3492         put_device(dev);
3493
3494 put_sess:
3495         put_device(&fnode_sess->dev);
3496
3497 put_host:
3498         scsi_host_put(shost);
3499
3500 exit_logout_fnode:
3501         return err;
3502 }
3503
3504 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3505                                       struct iscsi_uevent *ev)
3506 {
3507         struct Scsi_Host *shost;
3508         struct iscsi_cls_session *session;
3509         int err = 0;
3510
3511         if (!transport->logout_flashnode_sid) {
3512                 err = -ENOSYS;
3513                 goto exit_logout_sid;
3514         }
3515
3516         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3517         if (!shost) {
3518                 pr_err("%s could not find host no %u\n",
3519                        __func__, ev->u.logout_flashnode.host_no);
3520                 err = -ENODEV;
3521                 goto put_host;
3522         }
3523
3524         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3525         if (!session) {
3526                 pr_err("%s could not find session id %u\n",
3527                        __func__, ev->u.logout_flashnode_sid.sid);
3528                 err = -EINVAL;
3529                 goto put_host;
3530         }
3531
3532         err = transport->logout_flashnode_sid(session);
3533
3534 put_host:
3535         scsi_host_put(shost);
3536
3537 exit_logout_sid:
3538         return err;
3539 }
3540
3541 static int
3542 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3543 {
3544         struct iscsi_uevent *ev = nlmsg_data(nlh);
3545         struct Scsi_Host *shost = NULL;
3546         struct iscsi_internal *priv;
3547         struct sk_buff *skbhost_stats;
3548         struct nlmsghdr *nlhhost_stats;
3549         struct iscsi_uevent *evhost_stats;
3550         int host_stats_size = 0;
3551         int len, err = 0;
3552         char *buf;
3553
3554         if (!transport->get_host_stats)
3555                 return -ENOSYS;
3556
3557         priv = iscsi_if_transport_lookup(transport);
3558         if (!priv)
3559                 return -EINVAL;
3560
3561         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3562         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3563
3564         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3565         if (!shost) {
3566                 pr_err("%s: failed. Could not find host no %u\n",
3567                        __func__, ev->u.get_host_stats.host_no);
3568                 return -ENODEV;
3569         }
3570
3571         do {
3572                 int actual_size;
3573
3574                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3575                 if (!skbhost_stats) {
3576                         pr_err("cannot deliver host stats: OOM\n");
3577                         err = -ENOMEM;
3578                         goto exit_host_stats;
3579                 }
3580
3581                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3582                                       (len - sizeof(*nlhhost_stats)), 0);
3583                 evhost_stats = nlmsg_data(nlhhost_stats);
3584                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3585                 evhost_stats->transport_handle = iscsi_handle(transport);
3586                 evhost_stats->type = nlh->nlmsg_type;
3587                 evhost_stats->u.get_host_stats.host_no =
3588                                         ev->u.get_host_stats.host_no;
3589                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3590                 memset(buf, 0, host_stats_size);
3591
3592                 err = transport->get_host_stats(shost, buf, host_stats_size);
3593                 if (err) {
3594                         kfree_skb(skbhost_stats);
3595                         goto exit_host_stats;
3596                 }
3597
3598                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3599                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3600                 nlhhost_stats->nlmsg_len = actual_size;
3601
3602                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3603                                           GFP_KERNEL);
3604         } while (err < 0 && err != -ECONNREFUSED);
3605
3606 exit_host_stats:
3607         scsi_host_put(shost);
3608         return err;
3609 }
3610
3611
3612 static int
3613 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3614 {
3615         int err = 0;
3616         u32 portid;
3617         struct iscsi_uevent *ev = nlmsg_data(nlh);
3618         struct iscsi_transport *transport = NULL;
3619         struct iscsi_internal *priv;
3620         struct iscsi_cls_session *session;
3621         struct iscsi_cls_conn *conn;
3622         struct iscsi_endpoint *ep = NULL;
3623
3624         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3625                 *group = ISCSI_NL_GRP_UIP;
3626         else
3627                 *group = ISCSI_NL_GRP_ISCSID;
3628
3629         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3630         if (!priv)
3631                 return -EINVAL;
3632         transport = priv->iscsi_transport;
3633
3634         if (!try_module_get(transport->owner))
3635                 return -EINVAL;
3636
3637         portid = NETLINK_CB(skb).portid;
3638
3639         switch (nlh->nlmsg_type) {
3640         case ISCSI_UEVENT_CREATE_SESSION:
3641                 err = iscsi_if_create_session(priv, ep, ev,
3642                                               portid,
3643                                               ev->u.c_session.initial_cmdsn,
3644                                               ev->u.c_session.cmds_max,
3645                                               ev->u.c_session.queue_depth);
3646                 break;
3647         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3648                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3649                 if (!ep) {
3650                         err = -EINVAL;
3651                         break;
3652                 }
3653
3654                 err = iscsi_if_create_session(priv, ep, ev,
3655                                         portid,
3656                                         ev->u.c_bound_session.initial_cmdsn,
3657                                         ev->u.c_bound_session.cmds_max,
3658                                         ev->u.c_bound_session.queue_depth);
3659                 break;
3660         case ISCSI_UEVENT_DESTROY_SESSION:
3661                 session = iscsi_session_lookup(ev->u.d_session.sid);
3662                 if (!session)
3663                         err = -EINVAL;
3664                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3665                         err = -EBUSY;
3666                 else
3667                         transport->destroy_session(session);
3668                 break;
3669         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3670                 session = iscsi_session_lookup(ev->u.d_session.sid);
3671                 if (!session)
3672                         err = -EINVAL;
3673                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3674                         err = -EBUSY;
3675                 else {
3676                         unsigned long flags;
3677
3678                         /* Prevent this session from being found again */
3679                         spin_lock_irqsave(&sesslock, flags);
3680                         list_del_init(&session->sess_list);
3681                         spin_unlock_irqrestore(&sesslock, flags);
3682
3683                         queue_work(iscsi_destroy_workq, &session->destroy_work);
3684                 }
3685                 break;
3686         case ISCSI_UEVENT_UNBIND_SESSION:
3687                 session = iscsi_session_lookup(ev->u.d_session.sid);
3688                 if (session)
3689                         scsi_queue_work(iscsi_session_to_shost(session),
3690                                         &session->unbind_work);
3691                 else
3692                         err = -EINVAL;
3693                 break;
3694         case ISCSI_UEVENT_CREATE_CONN:
3695                 err = iscsi_if_create_conn(transport, ev);
3696                 break;
3697         case ISCSI_UEVENT_DESTROY_CONN:
3698                 err = iscsi_if_destroy_conn(transport, ev);
3699                 break;
3700         case ISCSI_UEVENT_BIND_CONN:
3701                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3702                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3703
3704                 if (conn && conn->ep)
3705                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3706
3707                 if (!session || !conn) {
3708                         err = -EINVAL;
3709                         break;
3710                 }
3711
3712                 mutex_lock(&conn_mutex);
3713                 ev->r.retcode = transport->bind_conn(session, conn,
3714                                                 ev->u.b_conn.transport_eph,
3715                                                 ev->u.b_conn.is_leading);
3716                 mutex_unlock(&conn_mutex);
3717
3718                 if (ev->r.retcode || !transport->ep_connect)
3719                         break;
3720
3721                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3722                 if (ep) {
3723                         ep->conn = conn;
3724
3725                         mutex_lock(&conn->ep_mutex);
3726                         conn->ep = ep;
3727                         mutex_unlock(&conn->ep_mutex);
3728                 } else
3729                         iscsi_cls_conn_printk(KERN_ERR, conn,
3730                                               "Could not set ep conn "
3731                                               "binding\n");
3732                 break;
3733         case ISCSI_UEVENT_SET_PARAM:
3734                 err = iscsi_set_param(transport, ev);
3735                 break;
3736         case ISCSI_UEVENT_START_CONN:
3737                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3738                 if (conn) {
3739                         mutex_lock(&conn_mutex);
3740                         ev->r.retcode = transport->start_conn(conn);
3741                         if (!ev->r.retcode)
3742                                 conn->state = ISCSI_CONN_UP;
3743                         mutex_unlock(&conn_mutex);
3744                 }
3745                 else
3746                         err = -EINVAL;
3747                 break;
3748         case ISCSI_UEVENT_STOP_CONN:
3749                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3750                 if (conn)
3751                         iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3752                 else
3753                         err = -EINVAL;
3754                 break;
3755         case ISCSI_UEVENT_SEND_PDU:
3756                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3757                 if (conn) {
3758                         mutex_lock(&conn_mutex);
3759                         ev->r.retcode = transport->send_pdu(conn,
3760                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3761                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3762                                 ev->u.send_pdu.data_size);
3763                         mutex_unlock(&conn_mutex);
3764                 }
3765                 else
3766                         err = -EINVAL;
3767                 break;
3768         case ISCSI_UEVENT_GET_STATS:
3769                 err = iscsi_if_get_stats(transport, nlh);
3770                 break;
3771         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3772         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3773         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3774         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3775                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3776                 break;
3777         case ISCSI_UEVENT_TGT_DSCVR:
3778                 err = iscsi_tgt_dscvr(transport, ev);
3779                 break;
3780         case ISCSI_UEVENT_SET_HOST_PARAM:
3781                 err = iscsi_set_host_param(transport, ev);
3782                 break;
3783         case ISCSI_UEVENT_PATH_UPDATE:
3784                 err = iscsi_set_path(transport, ev);
3785                 break;
3786         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3787                 err = iscsi_set_iface_params(transport, ev,
3788                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3789                 break;
3790         case ISCSI_UEVENT_PING:
3791                 err = iscsi_send_ping(transport, ev);
3792                 break;
3793         case ISCSI_UEVENT_GET_CHAP:
3794                 err = iscsi_get_chap(transport, nlh);
3795                 break;
3796         case ISCSI_UEVENT_DELETE_CHAP:
3797                 err = iscsi_delete_chap(transport, ev);
3798                 break;
3799         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3800                 err = iscsi_set_flashnode_param(transport, ev,
3801                                                 nlmsg_attrlen(nlh,
3802                                                               sizeof(*ev)));
3803                 break;
3804         case ISCSI_UEVENT_NEW_FLASHNODE:
3805                 err = iscsi_new_flashnode(transport, ev,
3806                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3807                 break;
3808         case ISCSI_UEVENT_DEL_FLASHNODE:
3809                 err = iscsi_del_flashnode(transport, ev);
3810                 break;
3811         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3812                 err = iscsi_login_flashnode(transport, ev);
3813                 break;
3814         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3815                 err = iscsi_logout_flashnode(transport, ev);
3816                 break;
3817         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3818                 err = iscsi_logout_flashnode_sid(transport, ev);
3819                 break;
3820         case ISCSI_UEVENT_SET_CHAP:
3821                 err = iscsi_set_chap(transport, ev,
3822                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3823                 break;
3824         case ISCSI_UEVENT_GET_HOST_STATS:
3825                 err = iscsi_get_host_stats(transport, nlh);
3826                 break;
3827         default:
3828                 err = -ENOSYS;
3829                 break;
3830         }
3831
3832         module_put(transport->owner);
3833         return err;
3834 }
3835
3836 /*
3837  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3838  * Malformed skbs with wrong lengths or invalid creds are not processed.
3839  */
3840 static void
3841 iscsi_if_rx(struct sk_buff *skb)
3842 {
3843         u32 portid = NETLINK_CB(skb).portid;
3844
3845         mutex_lock(&rx_queue_mutex);
3846         while (skb->len >= NLMSG_HDRLEN) {
3847                 int err;
3848                 uint32_t rlen;
3849                 struct nlmsghdr *nlh;
3850                 struct iscsi_uevent *ev;
3851                 uint32_t group;
3852                 int retries = ISCSI_SEND_MAX_ALLOWED;
3853
3854                 nlh = nlmsg_hdr(skb);
3855                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3856                     skb->len < nlh->nlmsg_len) {
3857                         break;
3858                 }
3859
3860                 ev = nlmsg_data(nlh);
3861                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3862                 if (rlen > skb->len)
3863                         rlen = skb->len;
3864
3865                 err = iscsi_if_recv_msg(skb, nlh, &group);
3866                 if (err) {
3867                         ev->type = ISCSI_KEVENT_IF_ERROR;
3868                         ev->iferror = err;
3869                 }
3870                 do {
3871                         /*
3872                          * special case for GET_STATS:
3873                          * on success - sending reply and stats from
3874                          * inside of if_recv_msg(),
3875                          * on error - fall through.
3876                          */
3877                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3878                                 break;
3879                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3880                                 break;
3881                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3882                                                   ev, sizeof(*ev));
3883                         if (err == -EAGAIN && --retries < 0) {
3884                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3885                                 break;
3886                         }
3887                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3888                 skb_pull(skb, rlen);
3889         }
3890         mutex_unlock(&rx_queue_mutex);
3891 }
3892
3893 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3894 struct device_attribute dev_attr_##_prefix##_##_name =  \
3895         __ATTR(_name,_mode,_show,_store)
3896
3897 /*
3898  * iSCSI connection attrs
3899  */
3900 #define iscsi_conn_attr_show(param)                                     \
3901 static ssize_t                                                          \
3902 show_conn_param_##param(struct device *dev,                             \
3903                         struct device_attribute *attr, char *buf)       \
3904 {                                                                       \
3905         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3906         struct iscsi_transport *t = conn->transport;                    \
3907         return t->get_conn_param(conn, param, buf);                     \
3908 }
3909
3910 #define iscsi_conn_attr(field, param)                                   \
3911         iscsi_conn_attr_show(param)                                     \
3912 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3913                         NULL);
3914
3915 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3916 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3917 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3918 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3919 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3920 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3921 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3922 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3923 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3924 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3925 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3926 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3927 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3928 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3929 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3930 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3931 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3932 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3933 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3934 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3935 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3936 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3937 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3938 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3939 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3940 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3941 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3942 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3943
3944 static const char *const connection_state_names[] = {
3945         [ISCSI_CONN_UP] = "up",
3946         [ISCSI_CONN_DOWN] = "down",
3947         [ISCSI_CONN_FAILED] = "failed"
3948 };
3949
3950 static ssize_t show_conn_state(struct device *dev,
3951                                struct device_attribute *attr, char *buf)
3952 {
3953         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3954         const char *state = "unknown";
3955
3956         if (conn->state >= 0 &&
3957             conn->state < ARRAY_SIZE(connection_state_names))
3958                 state = connection_state_names[conn->state];
3959
3960         return sprintf(buf, "%s\n", state);
3961 }
3962 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
3963                         NULL);
3964
3965 #define iscsi_conn_ep_attr_show(param)                                  \
3966 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3967                                           struct device_attribute *attr,\
3968                                           char *buf)                    \
3969 {                                                                       \
3970         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3971         struct iscsi_transport *t = conn->transport;                    \
3972         struct iscsi_endpoint *ep;                                      \
3973         ssize_t rc;                                                     \
3974                                                                         \
3975         /*                                                              \
3976          * Need to make sure ep_disconnect does not free the LLD's      \
3977          * interconnect resources while we are trying to read them.     \
3978          */                                                             \
3979         mutex_lock(&conn->ep_mutex);                                    \
3980         ep = conn->ep;                                                  \
3981         if (!ep && t->ep_connect) {                                     \
3982                 mutex_unlock(&conn->ep_mutex);                          \
3983                 return -ENOTCONN;                                       \
3984         }                                                               \
3985                                                                         \
3986         if (ep)                                                         \
3987                 rc = t->get_ep_param(ep, param, buf);                   \
3988         else                                                            \
3989                 rc = t->get_conn_param(conn, param, buf);               \
3990         mutex_unlock(&conn->ep_mutex);                                  \
3991         return rc;                                                      \
3992 }
3993
3994 #define iscsi_conn_ep_attr(field, param)                                \
3995         iscsi_conn_ep_attr_show(param)                                  \
3996 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3997                         show_conn_ep_param_##param, NULL);
3998
3999 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4000 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4001
4002 static struct attribute *iscsi_conn_attrs[] = {
4003         &dev_attr_conn_max_recv_dlength.attr,
4004         &dev_attr_conn_max_xmit_dlength.attr,
4005         &dev_attr_conn_header_digest.attr,
4006         &dev_attr_conn_data_digest.attr,
4007         &dev_attr_conn_ifmarker.attr,
4008         &dev_attr_conn_ofmarker.attr,
4009         &dev_attr_conn_address.attr,
4010         &dev_attr_conn_port.attr,
4011         &dev_attr_conn_exp_statsn.attr,
4012         &dev_attr_conn_persistent_address.attr,
4013         &dev_attr_conn_persistent_port.attr,
4014         &dev_attr_conn_ping_tmo.attr,
4015         &dev_attr_conn_recv_tmo.attr,
4016         &dev_attr_conn_local_port.attr,
4017         &dev_attr_conn_statsn.attr,
4018         &dev_attr_conn_keepalive_tmo.attr,
4019         &dev_attr_conn_max_segment_size.attr,
4020         &dev_attr_conn_tcp_timestamp_stat.attr,
4021         &dev_attr_conn_tcp_wsf_disable.attr,
4022         &dev_attr_conn_tcp_nagle_disable.attr,
4023         &dev_attr_conn_tcp_timer_scale.attr,
4024         &dev_attr_conn_tcp_timestamp_enable.attr,
4025         &dev_attr_conn_fragment_disable.attr,
4026         &dev_attr_conn_ipv4_tos.attr,
4027         &dev_attr_conn_ipv6_traffic_class.attr,
4028         &dev_attr_conn_ipv6_flow_label.attr,
4029         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4030         &dev_attr_conn_tcp_xmit_wsf.attr,
4031         &dev_attr_conn_tcp_recv_wsf.attr,
4032         &dev_attr_conn_local_ipaddr.attr,
4033         &dev_attr_conn_state.attr,
4034         NULL,
4035 };
4036
4037 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4038                                          struct attribute *attr, int i)
4039 {
4040         struct device *cdev = container_of(kobj, struct device, kobj);
4041         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4042         struct iscsi_transport *t = conn->transport;
4043         int param;
4044
4045         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4046                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4047         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4048                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4049         else if (attr == &dev_attr_conn_header_digest.attr)
4050                 param = ISCSI_PARAM_HDRDGST_EN;
4051         else if (attr == &dev_attr_conn_data_digest.attr)
4052                 param = ISCSI_PARAM_DATADGST_EN;
4053         else if (attr == &dev_attr_conn_ifmarker.attr)
4054                 param = ISCSI_PARAM_IFMARKER_EN;
4055         else if (attr == &dev_attr_conn_ofmarker.attr)
4056                 param = ISCSI_PARAM_OFMARKER_EN;
4057         else if (attr == &dev_attr_conn_address.attr)
4058                 param = ISCSI_PARAM_CONN_ADDRESS;
4059         else if (attr == &dev_attr_conn_port.attr)
4060                 param = ISCSI_PARAM_CONN_PORT;
4061         else if (attr == &dev_attr_conn_exp_statsn.attr)
4062                 param = ISCSI_PARAM_EXP_STATSN;
4063         else if (attr == &dev_attr_conn_persistent_address.attr)
4064                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4065         else if (attr == &dev_attr_conn_persistent_port.attr)
4066                 param = ISCSI_PARAM_PERSISTENT_PORT;
4067         else if (attr == &dev_attr_conn_ping_tmo.attr)
4068                 param = ISCSI_PARAM_PING_TMO;
4069         else if (attr == &dev_attr_conn_recv_tmo.attr)
4070                 param = ISCSI_PARAM_RECV_TMO;
4071         else if (attr == &dev_attr_conn_local_port.attr)
4072                 param = ISCSI_PARAM_LOCAL_PORT;
4073         else if (attr == &dev_attr_conn_statsn.attr)
4074                 param = ISCSI_PARAM_STATSN;
4075         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4076                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4077         else if (attr == &dev_attr_conn_max_segment_size.attr)
4078                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4079         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4080                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4081         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4082                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4083         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4084                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4085         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4086                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4087         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4088                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4089         else if (attr == &dev_attr_conn_fragment_disable.attr)
4090                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4091         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4092                 param = ISCSI_PARAM_IPV4_TOS;
4093         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4094                 param = ISCSI_PARAM_IPV6_TC;
4095         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4096                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4097         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4098                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4099         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4100                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4101         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4102                 param = ISCSI_PARAM_TCP_RECV_WSF;
4103         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4104                 param = ISCSI_PARAM_LOCAL_IPADDR;
4105         else if (attr == &dev_attr_conn_state.attr)
4106                 return S_IRUGO;
4107         else {
4108                 WARN_ONCE(1, "Invalid conn attr");
4109                 return 0;
4110         }
4111
4112         return t->attr_is_visible(ISCSI_PARAM, param);
4113 }
4114
4115 static struct attribute_group iscsi_conn_group = {
4116         .attrs = iscsi_conn_attrs,
4117         .is_visible = iscsi_conn_attr_is_visible,
4118 };
4119
4120 /*
4121  * iSCSI session attrs
4122  */
4123 #define iscsi_session_attr_show(param, perm)                            \
4124 static ssize_t                                                          \
4125 show_session_param_##param(struct device *dev,                          \
4126                            struct device_attribute *attr, char *buf)    \
4127 {                                                                       \
4128         struct iscsi_cls_session *session =                             \
4129                 iscsi_dev_to_session(dev->parent);                      \
4130         struct iscsi_transport *t = session->transport;                 \
4131                                                                         \
4132         if (perm && !capable(CAP_SYS_ADMIN))                            \
4133                 return -EACCES;                                         \
4134         return t->get_session_param(session, param, buf);               \
4135 }
4136
4137 #define iscsi_session_attr(field, param, perm)                          \
4138         iscsi_session_attr_show(param, perm)                            \
4139 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4140                         NULL);
4141 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4142 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4143 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4144 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4145 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4146 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4147 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4148 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4149 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4150 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4151 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4152 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4153 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4154 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4155 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4156 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4157 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4158 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4159 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4160 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4161 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4162 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4163 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4164 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4165 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4166 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4167 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4168 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4169 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4170 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4171 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4172 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4173 iscsi_session_attr(discovery_auth_optional,
4174                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4175 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4176 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4177 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4178 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4179 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4180 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4181 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4182
4183 static ssize_t
4184 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4185                         char *buf)
4186 {
4187         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4188         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4189 }
4190 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4191                         NULL);
4192 static ssize_t
4193 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4194                         char *buf)
4195 {
4196         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4197         return sprintf(buf, "%d\n", session->creator);
4198 }
4199 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4200                         NULL);
4201 static ssize_t
4202 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4203                             char *buf)
4204 {
4205         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4206         return sprintf(buf, "%d\n", session->target_id);
4207 }
4208 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4209                         show_priv_session_target_id, NULL);
4210
4211 #define iscsi_priv_session_attr_show(field, format)                     \
4212 static ssize_t                                                          \
4213 show_priv_session_##field(struct device *dev,                           \
4214                           struct device_attribute *attr, char *buf)     \
4215 {                                                                       \
4216         struct iscsi_cls_session *session =                             \
4217                         iscsi_dev_to_session(dev->parent);              \
4218         if (session->field == -1)                                       \
4219                 return sprintf(buf, "off\n");                           \
4220         return sprintf(buf, format"\n", session->field);                \
4221 }
4222
4223 #define iscsi_priv_session_attr_store(field)                            \
4224 static ssize_t                                                          \
4225 store_priv_session_##field(struct device *dev,                          \
4226                            struct device_attribute *attr,               \
4227                            const char *buf, size_t count)               \
4228 {                                                                       \
4229         int val;                                                        \
4230         char *cp;                                                       \
4231         struct iscsi_cls_session *session =                             \
4232                 iscsi_dev_to_session(dev->parent);                      \
4233         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4234             (session->state == ISCSI_SESSION_FAILED))                   \
4235                 return -EBUSY;                                          \
4236         if (strncmp(buf, "off", 3) == 0) {                              \
4237                 session->field = -1;                                    \
4238                 session->field##_sysfs_override = true;                 \
4239         } else {                                                        \
4240                 val = simple_strtoul(buf, &cp, 0);                      \
4241                 if (*cp != '\0' && *cp != '\n')                         \
4242                         return -EINVAL;                                 \
4243                 session->field = val;                                   \
4244                 session->field##_sysfs_override = true;                 \
4245         }                                                               \
4246         return count;                                                   \
4247 }
4248
4249 #define iscsi_priv_session_rw_attr(field, format)                       \
4250         iscsi_priv_session_attr_show(field, format)                     \
4251         iscsi_priv_session_attr_store(field)                            \
4252 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4253                         show_priv_session_##field,                      \
4254                         store_priv_session_##field)
4255
4256 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4257
4258 static struct attribute *iscsi_session_attrs[] = {
4259         &dev_attr_sess_initial_r2t.attr,
4260         &dev_attr_sess_max_outstanding_r2t.attr,
4261         &dev_attr_sess_immediate_data.attr,
4262         &dev_attr_sess_first_burst_len.attr,
4263         &dev_attr_sess_max_burst_len.attr,
4264         &dev_attr_sess_data_pdu_in_order.attr,
4265         &dev_attr_sess_data_seq_in_order.attr,
4266         &dev_attr_sess_erl.attr,
4267         &dev_attr_sess_targetname.attr,
4268         &dev_attr_sess_tpgt.attr,
4269         &dev_attr_sess_password.attr,
4270         &dev_attr_sess_password_in.attr,
4271         &dev_attr_sess_username.attr,
4272         &dev_attr_sess_username_in.attr,
4273         &dev_attr_sess_fast_abort.attr,
4274         &dev_attr_sess_abort_tmo.attr,
4275         &dev_attr_sess_lu_reset_tmo.attr,
4276         &dev_attr_sess_tgt_reset_tmo.attr,
4277         &dev_attr_sess_ifacename.attr,
4278         &dev_attr_sess_initiatorname.attr,
4279         &dev_attr_sess_targetalias.attr,
4280         &dev_attr_sess_boot_root.attr,
4281         &dev_attr_sess_boot_nic.attr,
4282         &dev_attr_sess_boot_target.attr,
4283         &dev_attr_priv_sess_recovery_tmo.attr,
4284         &dev_attr_priv_sess_state.attr,
4285         &dev_attr_priv_sess_creator.attr,
4286         &dev_attr_sess_chap_out_idx.attr,
4287         &dev_attr_sess_chap_in_idx.attr,
4288         &dev_attr_priv_sess_target_id.attr,
4289         &dev_attr_sess_auto_snd_tgt_disable.attr,
4290         &dev_attr_sess_discovery_session.attr,
4291         &dev_attr_sess_portal_type.attr,
4292         &dev_attr_sess_chap_auth.attr,
4293         &dev_attr_sess_discovery_logout.attr,
4294         &dev_attr_sess_bidi_chap.attr,
4295         &dev_attr_sess_discovery_auth_optional.attr,
4296         &dev_attr_sess_def_time2wait.attr,
4297         &dev_attr_sess_def_time2retain.attr,
4298         &dev_attr_sess_isid.attr,
4299         &dev_attr_sess_tsid.attr,
4300         &dev_attr_sess_def_taskmgmt_tmo.attr,
4301         &dev_attr_sess_discovery_parent_idx.attr,
4302         &dev_attr_sess_discovery_parent_type.attr,
4303         NULL,
4304 };
4305
4306 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4307                                             struct attribute *attr, int i)
4308 {
4309         struct device *cdev = container_of(kobj, struct device, kobj);
4310         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4311         struct iscsi_transport *t = session->transport;
4312         int param;
4313
4314         if (attr == &dev_attr_sess_initial_r2t.attr)
4315                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4316         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4317                 param = ISCSI_PARAM_MAX_R2T;
4318         else if (attr == &dev_attr_sess_immediate_data.attr)
4319                 param = ISCSI_PARAM_IMM_DATA_EN;
4320         else if (attr == &dev_attr_sess_first_burst_len.attr)
4321                 param = ISCSI_PARAM_FIRST_BURST;
4322         else if (attr == &dev_attr_sess_max_burst_len.attr)
4323                 param = ISCSI_PARAM_MAX_BURST;
4324         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4325                 param = ISCSI_PARAM_PDU_INORDER_EN;
4326         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4327                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4328         else if (attr == &dev_attr_sess_erl.attr)
4329                 param = ISCSI_PARAM_ERL;
4330         else if (attr == &dev_attr_sess_targetname.attr)
4331                 param = ISCSI_PARAM_TARGET_NAME;
4332         else if (attr == &dev_attr_sess_tpgt.attr)
4333                 param = ISCSI_PARAM_TPGT;
4334         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4335                 param = ISCSI_PARAM_CHAP_IN_IDX;
4336         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4337                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4338         else if (attr == &dev_attr_sess_password.attr)
4339                 param = ISCSI_PARAM_USERNAME;
4340         else if (attr == &dev_attr_sess_password_in.attr)
4341                 param = ISCSI_PARAM_USERNAME_IN;
4342         else if (attr == &dev_attr_sess_username.attr)
4343                 param = ISCSI_PARAM_PASSWORD;
4344         else if (attr == &dev_attr_sess_username_in.attr)
4345                 param = ISCSI_PARAM_PASSWORD_IN;
4346         else if (attr == &dev_attr_sess_fast_abort.attr)
4347                 param = ISCSI_PARAM_FAST_ABORT;
4348         else if (attr == &dev_attr_sess_abort_tmo.attr)
4349                 param = ISCSI_PARAM_ABORT_TMO;
4350         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4351                 param = ISCSI_PARAM_LU_RESET_TMO;
4352         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4353                 param = ISCSI_PARAM_TGT_RESET_TMO;
4354         else if (attr == &dev_attr_sess_ifacename.attr)
4355                 param = ISCSI_PARAM_IFACE_NAME;
4356         else if (attr == &dev_attr_sess_initiatorname.attr)
4357                 param = ISCSI_PARAM_INITIATOR_NAME;
4358         else if (attr == &dev_attr_sess_targetalias.attr)
4359                 param = ISCSI_PARAM_TARGET_ALIAS;
4360         else if (attr == &dev_attr_sess_boot_root.attr)
4361                 param = ISCSI_PARAM_BOOT_ROOT;
4362         else if (attr == &dev_attr_sess_boot_nic.attr)
4363                 param = ISCSI_PARAM_BOOT_NIC;
4364         else if (attr == &dev_attr_sess_boot_target.attr)
4365                 param = ISCSI_PARAM_BOOT_TARGET;
4366         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4367                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4368         else if (attr == &dev_attr_sess_discovery_session.attr)
4369                 param = ISCSI_PARAM_DISCOVERY_SESS;
4370         else if (attr == &dev_attr_sess_portal_type.attr)
4371                 param = ISCSI_PARAM_PORTAL_TYPE;
4372         else if (attr == &dev_attr_sess_chap_auth.attr)
4373                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4374         else if (attr == &dev_attr_sess_discovery_logout.attr)
4375                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4376         else if (attr == &dev_attr_sess_bidi_chap.attr)
4377                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4378         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4379                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4380         else if (attr == &dev_attr_sess_def_time2wait.attr)
4381                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4382         else if (attr == &dev_attr_sess_def_time2retain.attr)
4383                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4384         else if (attr == &dev_attr_sess_isid.attr)
4385                 param = ISCSI_PARAM_ISID;
4386         else if (attr == &dev_attr_sess_tsid.attr)
4387                 param = ISCSI_PARAM_TSID;
4388         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4389                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4390         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4391                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4392         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4393                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4394         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4395                 return S_IRUGO | S_IWUSR;
4396         else if (attr == &dev_attr_priv_sess_state.attr)
4397                 return S_IRUGO;
4398         else if (attr == &dev_attr_priv_sess_creator.attr)
4399                 return S_IRUGO;
4400         else if (attr == &dev_attr_priv_sess_target_id.attr)
4401                 return S_IRUGO;
4402         else {
4403                 WARN_ONCE(1, "Invalid session attr");
4404                 return 0;
4405         }
4406
4407         return t->attr_is_visible(ISCSI_PARAM, param);
4408 }
4409
4410 static struct attribute_group iscsi_session_group = {
4411         .attrs = iscsi_session_attrs,
4412         .is_visible = iscsi_session_attr_is_visible,
4413 };
4414
4415 /*
4416  * iSCSI host attrs
4417  */
4418 #define iscsi_host_attr_show(param)                                     \
4419 static ssize_t                                                          \
4420 show_host_param_##param(struct device *dev,                             \
4421                         struct device_attribute *attr, char *buf)       \
4422 {                                                                       \
4423         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4424         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4425         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4426 }
4427
4428 #define iscsi_host_attr(field, param)                                   \
4429         iscsi_host_attr_show(param)                                     \
4430 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4431                         NULL);
4432
4433 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4434 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4435 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4436 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4437 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4438 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4439
4440 static struct attribute *iscsi_host_attrs[] = {
4441         &dev_attr_host_netdev.attr,
4442         &dev_attr_host_hwaddress.attr,
4443         &dev_attr_host_ipaddress.attr,
4444         &dev_attr_host_initiatorname.attr,
4445         &dev_attr_host_port_state.attr,
4446         &dev_attr_host_port_speed.attr,
4447         NULL,
4448 };
4449
4450 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4451                                          struct attribute *attr, int i)
4452 {
4453         struct device *cdev = container_of(kobj, struct device, kobj);
4454         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4455         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4456         int param;
4457
4458         if (attr == &dev_attr_host_netdev.attr)
4459                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4460         else if (attr == &dev_attr_host_hwaddress.attr)
4461                 param = ISCSI_HOST_PARAM_HWADDRESS;
4462         else if (attr == &dev_attr_host_ipaddress.attr)
4463                 param = ISCSI_HOST_PARAM_IPADDRESS;
4464         else if (attr == &dev_attr_host_initiatorname.attr)
4465                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4466         else if (attr == &dev_attr_host_port_state.attr)
4467                 param = ISCSI_HOST_PARAM_PORT_STATE;
4468         else if (attr == &dev_attr_host_port_speed.attr)
4469                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4470         else {
4471                 WARN_ONCE(1, "Invalid host attr");
4472                 return 0;
4473         }
4474
4475         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4476 }
4477
4478 static struct attribute_group iscsi_host_group = {
4479         .attrs = iscsi_host_attrs,
4480         .is_visible = iscsi_host_attr_is_visible,
4481 };
4482
4483 /* convert iscsi_port_speed values to ascii string name */
4484 static const struct {
4485         enum iscsi_port_speed   value;
4486         char                    *name;
4487 } iscsi_port_speed_names[] = {
4488         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4489         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4490         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4491         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4492         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4493         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4494         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4495 };
4496
4497 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4498 {
4499         int i;
4500         char *speed = "Unknown!";
4501         struct iscsi_cls_host *ihost = shost->shost_data;
4502         uint32_t port_speed = ihost->port_speed;
4503
4504         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4505                 if (iscsi_port_speed_names[i].value & port_speed) {
4506                         speed = iscsi_port_speed_names[i].name;
4507                         break;
4508                 }
4509         }
4510         return speed;
4511 }
4512 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4513
4514 /* convert iscsi_port_state values to ascii string name */
4515 static const struct {
4516         enum iscsi_port_state   value;
4517         char                    *name;
4518 } iscsi_port_state_names[] = {
4519         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4520         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4521 };
4522
4523 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4524 {
4525         int i;
4526         char *state = "Unknown!";
4527         struct iscsi_cls_host *ihost = shost->shost_data;
4528         uint32_t port_state = ihost->port_state;
4529
4530         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4531                 if (iscsi_port_state_names[i].value & port_state) {
4532                         state = iscsi_port_state_names[i].name;
4533                         break;
4534                 }
4535         }
4536         return state;
4537 }
4538 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4539
4540 static int iscsi_session_match(struct attribute_container *cont,
4541                            struct device *dev)
4542 {
4543         struct iscsi_cls_session *session;
4544         struct Scsi_Host *shost;
4545         struct iscsi_internal *priv;
4546
4547         if (!iscsi_is_session_dev(dev))
4548                 return 0;
4549
4550         session = iscsi_dev_to_session(dev);
4551         shost = iscsi_session_to_shost(session);
4552         if (!shost->transportt)
4553                 return 0;
4554
4555         priv = to_iscsi_internal(shost->transportt);
4556         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4557                 return 0;
4558
4559         return &priv->session_cont.ac == cont;
4560 }
4561
4562 static int iscsi_conn_match(struct attribute_container *cont,
4563                            struct device *dev)
4564 {
4565         struct iscsi_cls_session *session;
4566         struct iscsi_cls_conn *conn;
4567         struct Scsi_Host *shost;
4568         struct iscsi_internal *priv;
4569
4570         if (!iscsi_is_conn_dev(dev))
4571                 return 0;
4572
4573         conn = iscsi_dev_to_conn(dev);
4574         session = iscsi_dev_to_session(conn->dev.parent);
4575         shost = iscsi_session_to_shost(session);
4576
4577         if (!shost->transportt)
4578                 return 0;
4579
4580         priv = to_iscsi_internal(shost->transportt);
4581         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4582                 return 0;
4583
4584         return &priv->conn_cont.ac == cont;
4585 }
4586
4587 static int iscsi_host_match(struct attribute_container *cont,
4588                             struct device *dev)
4589 {
4590         struct Scsi_Host *shost;
4591         struct iscsi_internal *priv;
4592
4593         if (!scsi_is_host_device(dev))
4594                 return 0;
4595
4596         shost = dev_to_shost(dev);
4597         if (!shost->transportt  ||
4598             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4599                 return 0;
4600
4601         priv = to_iscsi_internal(shost->transportt);
4602         return &priv->t.host_attrs.ac == cont;
4603 }
4604
4605 struct scsi_transport_template *
4606 iscsi_register_transport(struct iscsi_transport *tt)
4607 {
4608         struct iscsi_internal *priv;
4609         unsigned long flags;
4610         int err;
4611
4612         BUG_ON(!tt);
4613
4614         priv = iscsi_if_transport_lookup(tt);
4615         if (priv)
4616                 return NULL;
4617
4618         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4619         if (!priv)
4620                 return NULL;
4621         INIT_LIST_HEAD(&priv->list);
4622         priv->iscsi_transport = tt;
4623         priv->t.user_scan = iscsi_user_scan;
4624         priv->t.create_work_queue = 1;
4625
4626         priv->dev.class = &iscsi_transport_class;
4627         dev_set_name(&priv->dev, "%s", tt->name);
4628         err = device_register(&priv->dev);
4629         if (err)
4630                 goto free_priv;
4631
4632         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4633         if (err)
4634                 goto unregister_dev;
4635
4636         /* host parameters */
4637         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4638         priv->t.host_attrs.ac.match = iscsi_host_match;
4639         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4640         priv->t.host_size = sizeof(struct iscsi_cls_host);
4641         transport_container_register(&priv->t.host_attrs);
4642
4643         /* connection parameters */
4644         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4645         priv->conn_cont.ac.match = iscsi_conn_match;
4646         priv->conn_cont.ac.grp = &iscsi_conn_group;
4647         transport_container_register(&priv->conn_cont);
4648
4649         /* session parameters */
4650         priv->session_cont.ac.class = &iscsi_session_class.class;
4651         priv->session_cont.ac.match = iscsi_session_match;
4652         priv->session_cont.ac.grp = &iscsi_session_group;
4653         transport_container_register(&priv->session_cont);
4654
4655         spin_lock_irqsave(&iscsi_transport_lock, flags);
4656         list_add(&priv->list, &iscsi_transports);
4657         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4658
4659         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4660         return &priv->t;
4661
4662 unregister_dev:
4663         device_unregister(&priv->dev);
4664         return NULL;
4665 free_priv:
4666         kfree(priv);
4667         return NULL;
4668 }
4669 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4670
4671 int iscsi_unregister_transport(struct iscsi_transport *tt)
4672 {
4673         struct iscsi_internal *priv;
4674         unsigned long flags;
4675
4676         BUG_ON(!tt);
4677
4678         mutex_lock(&rx_queue_mutex);
4679
4680         priv = iscsi_if_transport_lookup(tt);
4681         BUG_ON (!priv);
4682
4683         spin_lock_irqsave(&iscsi_transport_lock, flags);
4684         list_del(&priv->list);
4685         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4686
4687         transport_container_unregister(&priv->conn_cont);
4688         transport_container_unregister(&priv->session_cont);
4689         transport_container_unregister(&priv->t.host_attrs);
4690
4691         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4692         device_unregister(&priv->dev);
4693         mutex_unlock(&rx_queue_mutex);
4694
4695         return 0;
4696 }
4697 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4698
4699 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4700                      struct device *dev, const char *fmt, ...)
4701 {
4702         struct va_format vaf;
4703         va_list args;
4704
4705         va_start(args, fmt);
4706         vaf.fmt = fmt;
4707         vaf.va = &args;
4708         trace(dev, &vaf);
4709         va_end(args);
4710 }
4711 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4712
4713 static __init int iscsi_transport_init(void)
4714 {
4715         int err;
4716         struct netlink_kernel_cfg cfg = {
4717                 .groups = 1,
4718                 .input  = iscsi_if_rx,
4719         };
4720         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4721                 ISCSI_TRANSPORT_VERSION);
4722
4723         atomic_set(&iscsi_session_nr, 0);
4724
4725         err = class_register(&iscsi_transport_class);
4726         if (err)
4727                 return err;
4728
4729         err = class_register(&iscsi_endpoint_class);
4730         if (err)
4731                 goto unregister_transport_class;
4732
4733         err = class_register(&iscsi_iface_class);
4734         if (err)
4735                 goto unregister_endpoint_class;
4736
4737         err = transport_class_register(&iscsi_host_class);
4738         if (err)
4739                 goto unregister_iface_class;
4740
4741         err = transport_class_register(&iscsi_connection_class);
4742         if (err)
4743                 goto unregister_host_class;
4744
4745         err = transport_class_register(&iscsi_session_class);
4746         if (err)
4747                 goto unregister_conn_class;
4748
4749         err = bus_register(&iscsi_flashnode_bus);
4750         if (err)
4751                 goto unregister_session_class;
4752
4753         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4754         if (!nls) {
4755                 err = -ENOBUFS;
4756                 goto unregister_flashnode_bus;
4757         }
4758
4759         iscsi_eh_timer_workq = alloc_workqueue("%s",
4760                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4761                         1, "iscsi_eh");
4762         if (!iscsi_eh_timer_workq) {
4763                 err = -ENOMEM;
4764                 goto release_nls;
4765         }
4766
4767         iscsi_destroy_workq = alloc_workqueue("%s",
4768                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4769                         1, "iscsi_destroy");
4770         if (!iscsi_destroy_workq) {
4771                 err = -ENOMEM;
4772                 goto destroy_wq;
4773         }
4774
4775         return 0;
4776
4777 destroy_wq:
4778         destroy_workqueue(iscsi_eh_timer_workq);
4779 release_nls:
4780         netlink_kernel_release(nls);
4781 unregister_flashnode_bus:
4782         bus_unregister(&iscsi_flashnode_bus);
4783 unregister_session_class:
4784         transport_class_unregister(&iscsi_session_class);
4785 unregister_conn_class:
4786         transport_class_unregister(&iscsi_connection_class);
4787 unregister_host_class:
4788         transport_class_unregister(&iscsi_host_class);
4789 unregister_iface_class:
4790         class_unregister(&iscsi_iface_class);
4791 unregister_endpoint_class:
4792         class_unregister(&iscsi_endpoint_class);
4793 unregister_transport_class:
4794         class_unregister(&iscsi_transport_class);
4795         return err;
4796 }
4797
4798 static void __exit iscsi_transport_exit(void)
4799 {
4800         destroy_workqueue(iscsi_destroy_workq);
4801         destroy_workqueue(iscsi_eh_timer_workq);
4802         netlink_kernel_release(nls);
4803         bus_unregister(&iscsi_flashnode_bus);
4804         transport_class_unregister(&iscsi_connection_class);
4805         transport_class_unregister(&iscsi_session_class);
4806         transport_class_unregister(&iscsi_host_class);
4807         class_unregister(&iscsi_endpoint_class);
4808         class_unregister(&iscsi_iface_class);
4809         class_unregister(&iscsi_transport_class);
4810 }
4811
4812 module_init(iscsi_transport_init);
4813 module_exit(iscsi_transport_exit);
4814
4815 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4816               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4817               "Alex Aizman <itn780@yahoo.com>");
4818 MODULE_DESCRIPTION("iSCSI Transport Interface");
4819 MODULE_LICENSE("GPL");
4820 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4821 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);