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