drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90
  91 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  92
  93 static DEFINE_IDA(iscsi_sess_ida);
  94 /*
  95  * list of registered transports and lock that must
  96  * be held while accessing list. The iscsi_transport_lock must
  97  * be acquired after the rx_queue_mutex.
  98  */
  99 static LIST_HEAD(iscsi_transports);
 100 static DEFINE_SPINLOCK(iscsi_transport_lock);
 101
 102 #define to_iscsi_internal(tmpl) \
 103         container_of(tmpl, struct iscsi_internal, t)
 104
 105 #define dev_to_iscsi_internal(_dev) \
 106         container_of(_dev, struct iscsi_internal, dev)
 107
 108 static void iscsi_transport_release(struct device *dev)
 109 {
 110         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 111         kfree(priv);
 112 }
 113
 114 /*
 115  * iscsi_transport_class represents the iscsi_transports that are
 116  * registered.
 117  */
 118 static struct class iscsi_transport_class = {
 119         .name = "iscsi_transport",
 120         .dev_release = iscsi_transport_release,
 121 };
 122
 123 static ssize_t
 124 show_transport_handle(struct device *dev, struct device_attribute *attr,
 125                       char *buf)
 126 {
 127         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 128
 129         if (!capable(CAP_SYS_ADMIN))
 130                 return -EACCES;
 131         return sysfs_emit(buf, "%llu\n",
 132                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 133 }
 134 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 135
 136 #define show_transport_attr(name, format)                               \
 137 static ssize_t                                                          \
 138 show_transport_##name(struct device *dev,                               \
 139                       struct device_attribute *attr,char *buf)          \
 140 {                                                                       \
 141         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 142         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 143 }                                                                       \
 144 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 145
 146 show_transport_attr(caps, "0x%x");
 147
 148 static struct attribute *iscsi_transport_attrs[] = {
 149         &dev_attr_handle.attr,
 150         &dev_attr_caps.attr,
 151         NULL,
 152 };
 153
 154 static struct attribute_group iscsi_transport_group = {
 155         .attrs = iscsi_transport_attrs,
 156 };
 157
 158 /*
 159  * iSCSI endpoint attrs
 160  */
 161 #define iscsi_dev_to_endpoint(_dev) \
 162         container_of(_dev, struct iscsi_endpoint, dev)
 163
 164 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 165 struct device_attribute dev_attr_##_prefix##_##_name =  \
 166         __ATTR(_name,_mode,_show,_store)
 167
 168 static void iscsi_endpoint_release(struct device *dev)
 169 {
 170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 171         kfree(ep);
 172 }
 173
 174 static struct class iscsi_endpoint_class = {
 175         .name = "iscsi_endpoint",
 176         .dev_release = iscsi_endpoint_release,
 177 };
 178
 179 static ssize_t
 180 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 181 {
 182         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 183         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 184 }
 185 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 186
 187 static struct attribute *iscsi_endpoint_attrs[] = {
 188         &dev_attr_ep_handle.attr,
 189         NULL,
 190 };
 191
 192 static struct attribute_group iscsi_endpoint_group = {
 193         .attrs = iscsi_endpoint_attrs,
 194 };
 195
 196 #define ISCSI_MAX_EPID -1
 197
 198 static int iscsi_match_epid(struct device *dev, const void *data)
 199 {
 200         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 201         const uint64_t *epid = data;
 202
 203         return *epid == ep->id;
 204 }
 205
 206 struct iscsi_endpoint *
 207 iscsi_create_endpoint(int dd_size)
 208 {
 209         struct device *dev;
 210         struct iscsi_endpoint *ep;
 211         uint64_t id;
 212         int err;
 213
 214         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 215                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 216                                         iscsi_match_epid);
 217                 if (!dev)
 218                         break;
 219                 else
 220                         put_device(dev);
 221         }
 222         if (id == ISCSI_MAX_EPID) {
 223                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 224                        ISCSI_MAX_EPID - 1);
 225                 return NULL;
 226         }
 227
 228         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 229         if (!ep)
 230                 return NULL;
 231
 232         ep->id = id;
 233         ep->dev.class = &iscsi_endpoint_class;
 234         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 235         err = device_register(&ep->dev);
 236         if (err)
 237                 goto free_ep;
 238
 239         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 240         if (err)
 241                 goto unregister_dev;
 242
 243         if (dd_size)
 244                 ep->dd_data = &ep[1];
 245         return ep;
 246
 247 unregister_dev:
 248         device_unregister(&ep->dev);
 249         return NULL;
 250
 251 free_ep:
 252         kfree(ep);
 253         return NULL;
 254 }
 255 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 256
 257 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 258 {
 259         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 260         device_unregister(&ep->dev);
 261 }
 262 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 263
 264 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 265 {
 266         put_device(&ep->dev);
 267 }
 268 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 269
 270 /**
 271  * iscsi_lookup_endpoint - get ep from handle
 272  * @handle: endpoint handle
 273  *
 274  * Caller must do a iscsi_put_endpoint.
 275  */
 276 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 277 {
 278         struct device *dev;
 279
 280         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 281                                 iscsi_match_epid);
 282         if (!dev)
 283                 return NULL;
 284
 285         return iscsi_dev_to_endpoint(dev);
 286 }
 287 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 288
 289 /*
 290  * Interface to display network param to sysfs
 291  */
 292
 293 static void iscsi_iface_release(struct device *dev)
 294 {
 295         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 296         struct device *parent = iface->dev.parent;
 297
 298         kfree(iface);
 299         put_device(parent);
 300 }
 301
 302
 303 static struct class iscsi_iface_class = {
 304         .name = "iscsi_iface",
 305         .dev_release = iscsi_iface_release,
 306 };
 307
 308 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 309 struct device_attribute dev_attr_##_prefix##_##_name =          \
 310         __ATTR(_name, _mode, _show, _store)
 311
 312 /* iface attrs show */
 313 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 314 static ssize_t                                                          \
 315 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 316                      char *buf)                                         \
 317 {                                                                       \
 318         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 319         struct iscsi_transport *t = iface->transport;                   \
 320         return t->get_iface_param(iface, param_type, param, buf);       \
 321 }                                                                       \
 322
 323 #define iscsi_iface_net_attr(type, name, param)                         \
 324         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 325 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 326
 327 #define iscsi_iface_attr(type, name, param)                             \
 328         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 329 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 330
 331 /* generic read only ipv4 attribute */
 332 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 333 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 334 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 335 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 336 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 337                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 338 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 339                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 340 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 341 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 342 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 343                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 346 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 347                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 348 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 349                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 354 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 355                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 356 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 357                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 358 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 359                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 360 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 361
 362 /* generic read only ipv6 attribute */
 363 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 364 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 365                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 366 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 367 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 368                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 369 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 370                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 371 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 372                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 373 iscsi_iface_net_attr(ipv6_iface, router_state,
 374                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 375 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 376                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 377 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 378 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 379 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 380                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 381 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 382 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 383                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 384 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 385                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 386 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 387                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 388 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 389                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 390 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 391                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 392
 393 /* common read only iface attribute */
 394 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 395 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 396 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 397 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 398 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 399 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 400 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 401 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 402 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 403                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 404 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 405 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 406 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 407 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 408 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 409 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 410
 411 /* common iscsi specific settings attributes */
 412 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 413 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 414 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 415 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 416 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 417 iscsi_iface_attr(iface, data_seq_in_order,
 418                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 419 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 420 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 421 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 422 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 423 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 424 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 425 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 426 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 427 iscsi_iface_attr(iface, discovery_auth_optional,
 428                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 429 iscsi_iface_attr(iface, discovery_logout,
 430                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 431 iscsi_iface_attr(iface, strict_login_comp_en,
 432                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 433 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 434
 435 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 436                                           struct attribute *attr, int i)
 437 {
 438         struct device *dev = container_of(kobj, struct device, kobj);
 439         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 440         struct iscsi_transport *t = iface->transport;
 441         int param = -1;
 442
 443         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 444                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 445         else if (attr == &dev_attr_iface_header_digest.attr)
 446                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 447         else if (attr == &dev_attr_iface_data_digest.attr)
 448                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 449         else if (attr == &dev_attr_iface_immediate_data.attr)
 450                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 451         else if (attr == &dev_attr_iface_initial_r2t.attr)
 452                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 453         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 454                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 455         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 456                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 457         else if (attr == &dev_attr_iface_erl.attr)
 458                 param = ISCSI_IFACE_PARAM_ERL;
 459         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 460                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 461         else if (attr == &dev_attr_iface_first_burst_len.attr)
 462                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 463         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 464                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 465         else if (attr == &dev_attr_iface_max_burst_len.attr)
 466                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 467         else if (attr == &dev_attr_iface_chap_auth.attr)
 468                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 469         else if (attr == &dev_attr_iface_bidi_chap.attr)
 470                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 471         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 472                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 473         else if (attr == &dev_attr_iface_discovery_logout.attr)
 474                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 475         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 476                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 477         else if (attr == &dev_attr_iface_initiator_name.attr)
 478                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 479
 480         if (param != -1)
 481                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 482
 483         if (attr == &dev_attr_iface_enabled.attr)
 484                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 485         else if (attr == &dev_attr_iface_vlan_id.attr)
 486                 param = ISCSI_NET_PARAM_VLAN_ID;
 487         else if (attr == &dev_attr_iface_vlan_priority.attr)
 488                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 489         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 490                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 491         else if (attr == &dev_attr_iface_mtu.attr)
 492                 param = ISCSI_NET_PARAM_MTU;
 493         else if (attr == &dev_attr_iface_port.attr)
 494                 param = ISCSI_NET_PARAM_PORT;
 495         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 496                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 497         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 498                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 499         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 500                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 501         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 502                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 503         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 504                 param = ISCSI_NET_PARAM_TCP_WSF;
 505         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 506                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 507         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 508                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 509         else if (attr == &dev_attr_iface_cache_id.attr)
 510                 param = ISCSI_NET_PARAM_CACHE_ID;
 511         else if (attr == &dev_attr_iface_redirect_en.attr)
 512                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 513         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 514                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 515                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 516                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 517                         param = ISCSI_NET_PARAM_IPV4_GW;
 518                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 519                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 520                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 522                 else if (attr ==
 523                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 524                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 525                 else if (attr ==
 526                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 528                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 529                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 530                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 531                         param = ISCSI_NET_PARAM_IPV4_TOS;
 532                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 534                 else if (attr ==
 535                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 536                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 537                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 538                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 539                 else if (attr ==
 540                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 541                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 542                 else if (attr ==
 543                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 545                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 546                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 547                 else if (attr ==
 548                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 549                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 550                 else if (attr ==
 551                          &dev_attr_ipv4_iface_fragment_disable.attr)
 552                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 553                 else if (attr ==
 554                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 555                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 556                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 557                         param = ISCSI_NET_PARAM_IPV4_TTL;
 558                 else
 559                         return 0;
 560         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 561                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 562                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 563                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 564                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 565                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 566                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 567                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 569                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 571                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 573                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 575                 else if (attr ==
 576                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 577                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 578                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 579                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 580                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 581                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 582                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 583                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 584                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 585                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 586                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 587                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 588                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 589                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 590                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 591                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 592                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 593                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 594                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 595                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 596                 else
 597                         return 0;
 598         } else {
 599                 WARN_ONCE(1, "Invalid iface attr");
 600                 return 0;
 601         }
 602
 603         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 604 }
 605
 606 static struct attribute *iscsi_iface_attrs[] = {
 607         &dev_attr_iface_enabled.attr,
 608         &dev_attr_iface_vlan_id.attr,
 609         &dev_attr_iface_vlan_priority.attr,
 610         &dev_attr_iface_vlan_enabled.attr,
 611         &dev_attr_ipv4_iface_ipaddress.attr,
 612         &dev_attr_ipv4_iface_gateway.attr,
 613         &dev_attr_ipv4_iface_subnet.attr,
 614         &dev_attr_ipv4_iface_bootproto.attr,
 615         &dev_attr_ipv6_iface_ipaddress.attr,
 616         &dev_attr_ipv6_iface_link_local_addr.attr,
 617         &dev_attr_ipv6_iface_router_addr.attr,
 618         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 619         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 620         &dev_attr_iface_mtu.attr,
 621         &dev_attr_iface_port.attr,
 622         &dev_attr_iface_ipaddress_state.attr,
 623         &dev_attr_iface_delayed_ack_en.attr,
 624         &dev_attr_iface_tcp_nagle_disable.attr,
 625         &dev_attr_iface_tcp_wsf_disable.attr,
 626         &dev_attr_iface_tcp_wsf.attr,
 627         &dev_attr_iface_tcp_timer_scale.attr,
 628         &dev_attr_iface_tcp_timestamp_en.attr,
 629         &dev_attr_iface_cache_id.attr,
 630         &dev_attr_iface_redirect_en.attr,
 631         &dev_attr_iface_def_taskmgmt_tmo.attr,
 632         &dev_attr_iface_header_digest.attr,
 633         &dev_attr_iface_data_digest.attr,
 634         &dev_attr_iface_immediate_data.attr,
 635         &dev_attr_iface_initial_r2t.attr,
 636         &dev_attr_iface_data_seq_in_order.attr,
 637         &dev_attr_iface_data_pdu_in_order.attr,
 638         &dev_attr_iface_erl.attr,
 639         &dev_attr_iface_max_recv_dlength.attr,
 640         &dev_attr_iface_first_burst_len.attr,
 641         &dev_attr_iface_max_outstanding_r2t.attr,
 642         &dev_attr_iface_max_burst_len.attr,
 643         &dev_attr_iface_chap_auth.attr,
 644         &dev_attr_iface_bidi_chap.attr,
 645         &dev_attr_iface_discovery_auth_optional.attr,
 646         &dev_attr_iface_discovery_logout.attr,
 647         &dev_attr_iface_strict_login_comp_en.attr,
 648         &dev_attr_iface_initiator_name.attr,
 649         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 650         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 651         &dev_attr_ipv4_iface_tos_en.attr,
 652         &dev_attr_ipv4_iface_tos.attr,
 653         &dev_attr_ipv4_iface_grat_arp_en.attr,
 654         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 655         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 656         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 657         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 658         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 659         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 660         &dev_attr_ipv4_iface_fragment_disable.attr,
 661         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 662         &dev_attr_ipv4_iface_ttl.attr,
 663         &dev_attr_ipv6_iface_link_local_state.attr,
 664         &dev_attr_ipv6_iface_router_state.attr,
 665         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 666         &dev_attr_ipv6_iface_mld_en.attr,
 667         &dev_attr_ipv6_iface_flow_label.attr,
 668         &dev_attr_ipv6_iface_traffic_class.attr,
 669         &dev_attr_ipv6_iface_hop_limit.attr,
 670         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 671         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 672         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 673         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 674         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 675         NULL,
 676 };
 677
 678 static struct attribute_group iscsi_iface_group = {
 679         .attrs = iscsi_iface_attrs,
 680         .is_visible = iscsi_iface_attr_is_visible,
 681 };
 682
 683 /* convert iscsi_ipaddress_state values to ascii string name */
 684 static const struct {
 685         enum iscsi_ipaddress_state      value;
 686         char                            *name;
 687 } iscsi_ipaddress_state_names[] = {
 688         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 689         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 690         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 691         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 692         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 693         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 694         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 695 };
 696
 697 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 698 {
 699         int i;
 700         char *state = NULL;
 701
 702         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 703                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 704                         state = iscsi_ipaddress_state_names[i].name;
 705                         break;
 706                 }
 707         }
 708         return state;
 709 }
 710 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 711
 712 /* convert iscsi_router_state values to ascii string name */
 713 static const struct {
 714         enum iscsi_router_state value;
 715         char                    *name;
 716 } iscsi_router_state_names[] = {
 717         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 718         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 719         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 720         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 721 };
 722
 723 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 724 {
 725         int i;
 726         char *state = NULL;
 727
 728         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 729                 if (iscsi_router_state_names[i].value == router_state) {
 730                         state = iscsi_router_state_names[i].name;
 731                         break;
 732                 }
 733         }
 734         return state;
 735 }
 736 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 737
 738 struct iscsi_iface *
 739 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 740                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 741 {
 742         struct iscsi_iface *iface;
 743         int err;
 744
 745         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 746         if (!iface)
 747                 return NULL;
 748
 749         iface->transport = transport;
 750         iface->iface_type = iface_type;
 751         iface->iface_num = iface_num;
 752         iface->dev.release = iscsi_iface_release;
 753         iface->dev.class = &iscsi_iface_class;
 754         /* parent reference released in iscsi_iface_release */
 755         iface->dev.parent = get_device(&shost->shost_gendev);
 756         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 757                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 758                              iface_num);
 759         else
 760                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 761                              iface_num);
 762
 763         err = device_register(&iface->dev);
 764         if (err)
 765                 goto free_iface;
 766
 767         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 768         if (err)
 769                 goto unreg_iface;
 770
 771         if (dd_size)
 772                 iface->dd_data = &iface[1];
 773         return iface;
 774
 775 unreg_iface:
 776         device_unregister(&iface->dev);
 777         return NULL;
 778
 779 free_iface:
 780         put_device(iface->dev.parent);
 781         kfree(iface);
 782         return NULL;
 783 }
 784 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 785
 786 void iscsi_destroy_iface(struct iscsi_iface *iface)
 787 {
 788         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 789         device_unregister(&iface->dev);
 790 }
 791 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 792
 793 /*
 794  * Interface to display flash node params to sysfs
 795  */
 796
 797 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 798 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 799         __ATTR(_name, _mode, _show, _store)
 800
 801 /* flash node session attrs show */
 802 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 803 static ssize_t                                                          \
 804 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 805                      char *buf)                                         \
 806 {                                                                       \
 807         struct iscsi_bus_flash_session *fnode_sess =                    \
 808                                         iscsi_dev_to_flash_session(dev);\
 809         struct iscsi_transport *t = fnode_sess->transport;              \
 810         return t->get_flashnode_param(fnode_sess, param, buf);          \
 811 }                                                                       \
 812
 813
 814 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 815         iscsi_flashnode_sess_attr_show(type, name, param)               \
 816 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 817                             show_##type##_##name, NULL);
 818
 819 /* Flash node session attributes */
 820
 821 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 822                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 823 iscsi_flashnode_sess_attr(fnode, discovery_session,
 824                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 825 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 826 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 827 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 828 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 829 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 830                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 831 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 832                           ISCSI_FLASHNODE_PDU_INORDER);
 833 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 834 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 835                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 836 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 837 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 838                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 839 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 840 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 841 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 842 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 843                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 844 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 845 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 846 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 847 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 848 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 849                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 850 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 851 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 852 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 853 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 854                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 855 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 856                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 857 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 858 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 859 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 860 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 861 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 862 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 863 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 864
 865 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 866         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 867         &dev_attr_fnode_discovery_session.attr,
 868         &dev_attr_fnode_portal_type.attr,
 869         &dev_attr_fnode_entry_enable.attr,
 870         &dev_attr_fnode_immediate_data.attr,
 871         &dev_attr_fnode_initial_r2t.attr,
 872         &dev_attr_fnode_data_seq_in_order.attr,
 873         &dev_attr_fnode_data_pdu_in_order.attr,
 874         &dev_attr_fnode_chap_auth.attr,
 875         &dev_attr_fnode_discovery_logout.attr,
 876         &dev_attr_fnode_bidi_chap.attr,
 877         &dev_attr_fnode_discovery_auth_optional.attr,
 878         &dev_attr_fnode_erl.attr,
 879         &dev_attr_fnode_first_burst_len.attr,
 880         &dev_attr_fnode_def_time2wait.attr,
 881         &dev_attr_fnode_def_time2retain.attr,
 882         &dev_attr_fnode_max_outstanding_r2t.attr,
 883         &dev_attr_fnode_isid.attr,
 884         &dev_attr_fnode_tsid.attr,
 885         &dev_attr_fnode_max_burst_len.attr,
 886         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 887         &dev_attr_fnode_targetalias.attr,
 888         &dev_attr_fnode_targetname.attr,
 889         &dev_attr_fnode_tpgt.attr,
 890         &dev_attr_fnode_discovery_parent_idx.attr,
 891         &dev_attr_fnode_discovery_parent_type.attr,
 892         &dev_attr_fnode_chap_in_idx.attr,
 893         &dev_attr_fnode_chap_out_idx.attr,
 894         &dev_attr_fnode_username.attr,
 895         &dev_attr_fnode_username_in.attr,
 896         &dev_attr_fnode_password.attr,
 897         &dev_attr_fnode_password_in.attr,
 898         &dev_attr_fnode_is_boot_target.attr,
 899         NULL,
 900 };
 901
 902 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 903                                                     struct attribute *attr,
 904                                                     int i)
 905 {
 906         struct device *dev = container_of(kobj, struct device, kobj);
 907         struct iscsi_bus_flash_session *fnode_sess =
 908                                                 iscsi_dev_to_flash_session(dev);
 909         struct iscsi_transport *t = fnode_sess->transport;
 910         int param;
 911
 912         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 913                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 914         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 915                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 916         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 917                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 918         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 919                 param = ISCSI_FLASHNODE_ENTRY_EN;
 920         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 921                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 922         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 923                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 924         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 925                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 926         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 927                 param = ISCSI_FLASHNODE_PDU_INORDER;
 928         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 929                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 930         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 931                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 932         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 933                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 934         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 935                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 936         } else if (attr == &dev_attr_fnode_erl.attr) {
 937                 param = ISCSI_FLASHNODE_ERL;
 938         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 939                 param = ISCSI_FLASHNODE_FIRST_BURST;
 940         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 941                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 942         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 943                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 944         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 945                 param = ISCSI_FLASHNODE_MAX_R2T;
 946         } else if (attr == &dev_attr_fnode_isid.attr) {
 947                 param = ISCSI_FLASHNODE_ISID;
 948         } else if (attr == &dev_attr_fnode_tsid.attr) {
 949                 param = ISCSI_FLASHNODE_TSID;
 950         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 951                 param = ISCSI_FLASHNODE_MAX_BURST;
 952         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 953                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 954         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 955                 param = ISCSI_FLASHNODE_ALIAS;
 956         } else if (attr == &dev_attr_fnode_targetname.attr) {
 957                 param = ISCSI_FLASHNODE_NAME;
 958         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 959                 param = ISCSI_FLASHNODE_TPGT;
 960         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 961                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 962         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 963                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 964         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 965                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 966         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 967                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 968         } else if (attr == &dev_attr_fnode_username.attr) {
 969                 param = ISCSI_FLASHNODE_USERNAME;
 970         } else if (attr == &dev_attr_fnode_username_in.attr) {
 971                 param = ISCSI_FLASHNODE_USERNAME_IN;
 972         } else if (attr == &dev_attr_fnode_password.attr) {
 973                 param = ISCSI_FLASHNODE_PASSWORD;
 974         } else if (attr == &dev_attr_fnode_password_in.attr) {
 975                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 976         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 977                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 978         } else {
 979                 WARN_ONCE(1, "Invalid flashnode session attr");
 980                 return 0;
 981         }
 982
 983         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 984 }
 985
 986 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 987         .attrs = iscsi_flashnode_sess_attrs,
 988         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 989 };
 990
 991 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 992         &iscsi_flashnode_sess_attr_group,
 993         NULL,
 994 };
 995
 996 static void iscsi_flashnode_sess_release(struct device *dev)
 997 {
 998         struct iscsi_bus_flash_session *fnode_sess =
 999                                                 iscsi_dev_to_flash_session(dev);
1000
1001         kfree(fnode_sess->targetname);
1002         kfree(fnode_sess->targetalias);
1003         kfree(fnode_sess->portal_type);
1004         kfree(fnode_sess);
1005 }
1006
1007 static const struct device_type iscsi_flashnode_sess_dev_type = {
1008         .name = "iscsi_flashnode_sess_dev_type",
1009         .groups = iscsi_flashnode_sess_attr_groups,
1010         .release = iscsi_flashnode_sess_release,
1011 };
1012
1013 /* flash node connection attrs show */
1014 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1015 static ssize_t                                                          \
1016 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1017                      char *buf)                                         \
1018 {                                                                       \
1019         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1020         struct iscsi_bus_flash_session *fnode_sess =                    \
1021                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1022         struct iscsi_transport *t = fnode_conn->transport;              \
1023         return t->get_flashnode_param(fnode_sess, param, buf);          \
1024 }                                                                       \
1025
1026
1027 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1028         iscsi_flashnode_conn_attr_show(type, name, param)               \
1029 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1030                             show_##type##_##name, NULL);
1031
1032 /* Flash node connection attributes */
1033
1034 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1035                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1036 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1037 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1038 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1039 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1040                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1041 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1042                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1043 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1044                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1045 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1046                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1047 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1048                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1049 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1050                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1051 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1052 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1053 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1054 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1055                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1056 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1057                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1058 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1059 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1060 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1061 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1062                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1063 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1064                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1065 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1066                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1067 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1068                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1069 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1070 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1071 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1072 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1073
1074 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1075         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1076         &dev_attr_fnode_header_digest.attr,
1077         &dev_attr_fnode_data_digest.attr,
1078         &dev_attr_fnode_snack_req.attr,
1079         &dev_attr_fnode_tcp_timestamp_stat.attr,
1080         &dev_attr_fnode_tcp_nagle_disable.attr,
1081         &dev_attr_fnode_tcp_wsf_disable.attr,
1082         &dev_attr_fnode_tcp_timer_scale.attr,
1083         &dev_attr_fnode_tcp_timestamp_enable.attr,
1084         &dev_attr_fnode_fragment_disable.attr,
1085         &dev_attr_fnode_max_recv_dlength.attr,
1086         &dev_attr_fnode_max_xmit_dlength.attr,
1087         &dev_attr_fnode_keepalive_tmo.attr,
1088         &dev_attr_fnode_port.attr,
1089         &dev_attr_fnode_ipaddress.attr,
1090         &dev_attr_fnode_redirect_ipaddr.attr,
1091         &dev_attr_fnode_max_segment_size.attr,
1092         &dev_attr_fnode_local_port.attr,
1093         &dev_attr_fnode_ipv4_tos.attr,
1094         &dev_attr_fnode_ipv6_traffic_class.attr,
1095         &dev_attr_fnode_ipv6_flow_label.attr,
1096         &dev_attr_fnode_link_local_ipv6.attr,
1097         &dev_attr_fnode_tcp_xmit_wsf.attr,
1098         &dev_attr_fnode_tcp_recv_wsf.attr,
1099         &dev_attr_fnode_statsn.attr,
1100         &dev_attr_fnode_exp_statsn.attr,
1101         NULL,
1102 };
1103
1104 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1105                                                     struct attribute *attr,
1106                                                     int i)
1107 {
1108         struct device *dev = container_of(kobj, struct device, kobj);
1109         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1110         struct iscsi_transport *t = fnode_conn->transport;
1111         int param;
1112
1113         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1114                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1115         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1116                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1117         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1118                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1119         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1120                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1121         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1122                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1123         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1124                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1125         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1126                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1127         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1128                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1129         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1130                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1131         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1132                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1133         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1134                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1135         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1136                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1137         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1138                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1139         } else if (attr == &dev_attr_fnode_port.attr) {
1140                 param = ISCSI_FLASHNODE_PORT;
1141         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1142                 param = ISCSI_FLASHNODE_IPADDR;
1143         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1144                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1145         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1146                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1147         } else if (attr == &dev_attr_fnode_local_port.attr) {
1148                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1149         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1150                 param = ISCSI_FLASHNODE_IPV4_TOS;
1151         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1152                 param = ISCSI_FLASHNODE_IPV6_TC;
1153         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1154                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1155         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1156                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1157         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1158                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1159         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1160                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1161         } else if (attr == &dev_attr_fnode_statsn.attr) {
1162                 param = ISCSI_FLASHNODE_STATSN;
1163         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1164                 param = ISCSI_FLASHNODE_EXP_STATSN;
1165         } else {
1166                 WARN_ONCE(1, "Invalid flashnode connection attr");
1167                 return 0;
1168         }
1169
1170         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1171 }
1172
1173 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1174         .attrs = iscsi_flashnode_conn_attrs,
1175         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1176 };
1177
1178 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1179         &iscsi_flashnode_conn_attr_group,
1180         NULL,
1181 };
1182
1183 static void iscsi_flashnode_conn_release(struct device *dev)
1184 {
1185         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1186
1187         kfree(fnode_conn->ipaddress);
1188         kfree(fnode_conn->redirect_ipaddr);
1189         kfree(fnode_conn->link_local_ipv6_addr);
1190         kfree(fnode_conn);
1191 }
1192
1193 static const struct device_type iscsi_flashnode_conn_dev_type = {
1194         .name = "iscsi_flashnode_conn_dev_type",
1195         .groups = iscsi_flashnode_conn_attr_groups,
1196         .release = iscsi_flashnode_conn_release,
1197 };
1198
1199 static struct bus_type iscsi_flashnode_bus;
1200
1201 int iscsi_flashnode_bus_match(struct device *dev,
1202                                      struct device_driver *drv)
1203 {
1204         if (dev->bus == &iscsi_flashnode_bus)
1205                 return 1;
1206         return 0;
1207 }
1208 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1209
1210 static struct bus_type iscsi_flashnode_bus = {
1211         .name = "iscsi_flashnode",
1212         .match = &iscsi_flashnode_bus_match,
1213 };
1214
1215 /**
1216  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1217  * @shost: pointer to host data
1218  * @index: index of flashnode to add in sysfs
1219  * @transport: pointer to transport data
1220  * @dd_size: total size to allocate
1221  *
1222  * Adds a sysfs entry for the flashnode session attributes
1223  *
1224  * Returns:
1225  *  pointer to allocated flashnode sess on success
1226  *  %NULL on failure
1227  */
1228 struct iscsi_bus_flash_session *
1229 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1230                             struct iscsi_transport *transport,
1231                             int dd_size)
1232 {
1233         struct iscsi_bus_flash_session *fnode_sess;
1234         int err;
1235
1236         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1237         if (!fnode_sess)
1238                 return NULL;
1239
1240         fnode_sess->transport = transport;
1241         fnode_sess->target_id = index;
1242         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1243         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1244         fnode_sess->dev.parent = &shost->shost_gendev;
1245         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1246                      shost->host_no, index);
1247
1248         err = device_register(&fnode_sess->dev);
1249         if (err)
1250                 goto free_fnode_sess;
1251
1252         if (dd_size)
1253                 fnode_sess->dd_data = &fnode_sess[1];
1254
1255         return fnode_sess;
1256
1257 free_fnode_sess:
1258         kfree(fnode_sess);
1259         return NULL;
1260 }
1261 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1262
1263 /**
1264  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1265  * @shost: pointer to host data
1266  * @fnode_sess: pointer to the parent flashnode session entry
1267  * @transport: pointer to transport data
1268  * @dd_size: total size to allocate
1269  *
1270  * Adds a sysfs entry for the flashnode connection attributes
1271  *
1272  * Returns:
1273  *  pointer to allocated flashnode conn on success
1274  *  %NULL on failure
1275  */
1276 struct iscsi_bus_flash_conn *
1277 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1278                             struct iscsi_bus_flash_session *fnode_sess,
1279                             struct iscsi_transport *transport,
1280                             int dd_size)
1281 {
1282         struct iscsi_bus_flash_conn *fnode_conn;
1283         int err;
1284
1285         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1286         if (!fnode_conn)
1287                 return NULL;
1288
1289         fnode_conn->transport = transport;
1290         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1291         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1292         fnode_conn->dev.parent = &fnode_sess->dev;
1293         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1294                      shost->host_no, fnode_sess->target_id);
1295
1296         err = device_register(&fnode_conn->dev);
1297         if (err)
1298                 goto free_fnode_conn;
1299
1300         if (dd_size)
1301                 fnode_conn->dd_data = &fnode_conn[1];
1302
1303         return fnode_conn;
1304
1305 free_fnode_conn:
1306         kfree(fnode_conn);
1307         return NULL;
1308 }
1309 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1310
1311 /**
1312  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1313  * @dev: device to verify
1314  * @data: pointer to data containing value to use for verification
1315  *
1316  * Verifies if the passed device is flashnode conn device
1317  *
1318  * Returns:
1319  *  1 on success
1320  *  0 on failure
1321  */
1322 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1323 {
1324         return dev->bus == &iscsi_flashnode_bus;
1325 }
1326
1327 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1328 {
1329         device_unregister(&fnode_conn->dev);
1330         return 0;
1331 }
1332
1333 static int flashnode_match_index(struct device *dev, void *data)
1334 {
1335         struct iscsi_bus_flash_session *fnode_sess = NULL;
1336         int ret = 0;
1337
1338         if (!iscsi_flashnode_bus_match(dev, NULL))
1339                 goto exit_match_index;
1340
1341         fnode_sess = iscsi_dev_to_flash_session(dev);
1342         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1343
1344 exit_match_index:
1345         return ret;
1346 }
1347
1348 /**
1349  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1350  * @shost: pointer to host data
1351  * @idx: index to match
1352  *
1353  * Finds the flashnode session object for the passed index
1354  *
1355  * Returns:
1356  *  pointer to found flashnode session object on success
1357  *  %NULL on failure
1358  */
1359 static struct iscsi_bus_flash_session *
1360 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1361 {
1362         struct iscsi_bus_flash_session *fnode_sess = NULL;
1363         struct device *dev;
1364
1365         dev = device_find_child(&shost->shost_gendev, &idx,
1366                                 flashnode_match_index);
1367         if (dev)
1368                 fnode_sess = iscsi_dev_to_flash_session(dev);
1369
1370         return fnode_sess;
1371 }
1372
1373 /**
1374  * iscsi_find_flashnode_sess - finds flashnode session entry
1375  * @shost: pointer to host data
1376  * @data: pointer to data containing value to use for comparison
1377  * @fn: function pointer that does actual comparison
1378  *
1379  * Finds the flashnode session object comparing the data passed using logic
1380  * defined in passed function pointer
1381  *
1382  * Returns:
1383  *  pointer to found flashnode session device object on success
1384  *  %NULL on failure
1385  */
1386 struct device *
1387 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1388                           int (*fn)(struct device *dev, void *data))
1389 {
1390         return device_find_child(&shost->shost_gendev, data, fn);
1391 }
1392 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1393
1394 /**
1395  * iscsi_find_flashnode_conn - finds flashnode connection entry
1396  * @fnode_sess: pointer to parent flashnode session entry
1397  *
1398  * Finds the flashnode connection object comparing the data passed using logic
1399  * defined in passed function pointer
1400  *
1401  * Returns:
1402  *  pointer to found flashnode connection device object on success
1403  *  %NULL on failure
1404  */
1405 struct device *
1406 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1407 {
1408         return device_find_child(&fnode_sess->dev, NULL,
1409                                  iscsi_is_flashnode_conn_dev);
1410 }
1411 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1412
1413 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1414 {
1415         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1416                 return 0;
1417
1418         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1419 }
1420
1421 /**
1422  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1423  * @fnode_sess: pointer to flashnode session entry to be destroyed
1424  *
1425  * Deletes the flashnode session entry and all children flashnode connection
1426  * entries from sysfs
1427  */
1428 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1429 {
1430         int err;
1431
1432         err = device_for_each_child(&fnode_sess->dev, NULL,
1433                                     iscsi_iter_destroy_flashnode_conn_fn);
1434         if (err)
1435                 pr_err("Could not delete all connections for %s. Error %d.\n",
1436                        fnode_sess->dev.kobj.name, err);
1437
1438         device_unregister(&fnode_sess->dev);
1439 }
1440 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1441
1442 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1443 {
1444         if (!iscsi_flashnode_bus_match(dev, NULL))
1445                 return 0;
1446
1447         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1448         return 0;
1449 }
1450
1451 /**
1452  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1453  * @shost: pointer to host data
1454  *
1455  * Destroys all the flashnode session entries and all corresponding children
1456  * flashnode connection entries from sysfs
1457  */
1458 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1459 {
1460         device_for_each_child(&shost->shost_gendev, NULL,
1461                               iscsi_iter_destroy_flashnode_fn);
1462 }
1463 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1464
1465 /*
1466  * BSG support
1467  */
1468 /**
1469  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1470  * @job: bsg job to be processed
1471  */
1472 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1473 {
1474         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1475         struct iscsi_bsg_request *req = job->request;
1476         struct iscsi_bsg_reply *reply = job->reply;
1477         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1478         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1479         int ret;
1480
1481         /* check if we have the msgcode value at least */
1482         if (job->request_len < sizeof(uint32_t)) {
1483                 ret = -ENOMSG;
1484                 goto fail_host_msg;
1485         }
1486
1487         /* Validate the host command */
1488         switch (req->msgcode) {
1489         case ISCSI_BSG_HST_VENDOR:
1490                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1491                 if ((shost->hostt->vendor_id == 0L) ||
1492                     (req->rqst_data.h_vendor.vendor_id !=
1493                         shost->hostt->vendor_id)) {
1494                         ret = -ESRCH;
1495                         goto fail_host_msg;
1496                 }
1497                 break;
1498         default:
1499                 ret = -EBADR;
1500                 goto fail_host_msg;
1501         }
1502
1503         /* check if we really have all the request data needed */
1504         if (job->request_len < cmdlen) {
1505                 ret = -ENOMSG;
1506                 goto fail_host_msg;
1507         }
1508
1509         ret = i->iscsi_transport->bsg_request(job);
1510         if (!ret)
1511                 return 0;
1512
1513 fail_host_msg:
1514         /* return the errno failure code as the only status */
1515         BUG_ON(job->reply_len < sizeof(uint32_t));
1516         reply->reply_payload_rcv_len = 0;
1517         reply->result = ret;
1518         job->reply_len = sizeof(uint32_t);
1519         bsg_job_done(job, ret, 0);
1520         return 0;
1521 }
1522
1523 /**
1524  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1525  * @shost: shost for iscsi_host
1526  * @ihost: iscsi_cls_host adding the structures to
1527  */
1528 static int
1529 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1530 {
1531         struct device *dev = &shost->shost_gendev;
1532         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1533         struct request_queue *q;
1534         char bsg_name[20];
1535
1536         if (!i->iscsi_transport->bsg_request)
1537                 return -ENOTSUPP;
1538
1539         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1540         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1541         if (IS_ERR(q)) {
1542                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1543                              "initialize - no request queue\n");
1544                 return PTR_ERR(q);
1545         }
1546         __scsi_init_queue(shost, q);
1547
1548         ihost->bsg_q = q;
1549         return 0;
1550 }
1551
1552 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1553                             struct device *cdev)
1554 {
1555         struct Scsi_Host *shost = dev_to_shost(dev);
1556         struct iscsi_cls_host *ihost = shost->shost_data;
1557
1558         memset(ihost, 0, sizeof(*ihost));
1559         mutex_init(&ihost->mutex);
1560
1561         iscsi_bsg_host_add(shost, ihost);
1562         /* ignore any bsg add error - we just can't do sgio */
1563
1564         return 0;
1565 }
1566
1567 static int iscsi_remove_host(struct transport_container *tc,
1568                              struct device *dev, struct device *cdev)
1569 {
1570         struct Scsi_Host *shost = dev_to_shost(dev);
1571         struct iscsi_cls_host *ihost = shost->shost_data;
1572
1573         bsg_remove_queue(ihost->bsg_q);
1574         return 0;
1575 }
1576
1577 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1578                                "iscsi_host",
1579                                iscsi_setup_host,
1580                                iscsi_remove_host,
1581                                NULL);
1582
1583 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1584                                "iscsi_session",
1585                                NULL,
1586                                NULL,
1587                                NULL);
1588
1589 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1590                                "iscsi_connection",
1591                                NULL,
1592                                NULL,
1593                                NULL);
1594
1595 static struct sock *nls;
1596 static DEFINE_MUTEX(rx_queue_mutex);
1597
1598 static LIST_HEAD(sesslist);
1599 static DEFINE_SPINLOCK(sesslock);
1600 static LIST_HEAD(connlist);
1601 static LIST_HEAD(connlist_err);
1602 static DEFINE_SPINLOCK(connlock);
1603
1604 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1605 {
1606         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1607         return sess->sid;
1608 }
1609
1610 /*
1611  * Returns the matching session to a given sid
1612  */
1613 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1614 {
1615         unsigned long flags;
1616         struct iscsi_cls_session *sess;
1617
1618         spin_lock_irqsave(&sesslock, flags);
1619         list_for_each_entry(sess, &sesslist, sess_list) {
1620                 if (sess->sid == sid) {
1621                         spin_unlock_irqrestore(&sesslock, flags);
1622                         return sess;
1623                 }
1624         }
1625         spin_unlock_irqrestore(&sesslock, flags);
1626         return NULL;
1627 }
1628
1629 /*
1630  * Returns the matching connection to a given sid / cid tuple
1631  */
1632 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1633 {
1634         unsigned long flags;
1635         struct iscsi_cls_conn *conn;
1636
1637         spin_lock_irqsave(&connlock, flags);
1638         list_for_each_entry(conn, &connlist, conn_list) {
1639                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1640                         spin_unlock_irqrestore(&connlock, flags);
1641                         return conn;
1642                 }
1643         }
1644         spin_unlock_irqrestore(&connlock, flags);
1645         return NULL;
1646 }
1647
1648 /*
1649  * The following functions can be used by LLDs that allocate
1650  * their own scsi_hosts or by software iscsi LLDs
1651  */
1652 static struct {
1653         int value;
1654         char *name;
1655 } iscsi_session_state_names[] = {
1656         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1657         { ISCSI_SESSION_FAILED,         "FAILED" },
1658         { ISCSI_SESSION_FREE,           "FREE" },
1659 };
1660
1661 static const char *iscsi_session_state_name(int state)
1662 {
1663         int i;
1664         char *name = NULL;
1665
1666         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1667                 if (iscsi_session_state_names[i].value == state) {
1668                         name = iscsi_session_state_names[i].name;
1669                         break;
1670                 }
1671         }
1672         return name;
1673 }
1674
1675 int iscsi_session_chkready(struct iscsi_cls_session *session)
1676 {
1677         int err;
1678
1679         switch (session->state) {
1680         case ISCSI_SESSION_LOGGED_IN:
1681                 err = 0;
1682                 break;
1683         case ISCSI_SESSION_FAILED:
1684                 err = DID_IMM_RETRY << 16;
1685                 break;
1686         case ISCSI_SESSION_FREE:
1687                 err = DID_TRANSPORT_FAILFAST << 16;
1688                 break;
1689         default:
1690                 err = DID_NO_CONNECT << 16;
1691                 break;
1692         }
1693         return err;
1694 }
1695 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1696
1697 int iscsi_is_session_online(struct iscsi_cls_session *session)
1698 {
1699         unsigned long flags;
1700         int ret = 0;
1701
1702         spin_lock_irqsave(&session->lock, flags);
1703         if (session->state == ISCSI_SESSION_LOGGED_IN)
1704                 ret = 1;
1705         spin_unlock_irqrestore(&session->lock, flags);
1706         return ret;
1707 }
1708 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1709
1710 static void iscsi_session_release(struct device *dev)
1711 {
1712         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1713         struct Scsi_Host *shost;
1714
1715         shost = iscsi_session_to_shost(session);
1716         scsi_host_put(shost);
1717         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1718         kfree(session);
1719 }
1720
1721 int iscsi_is_session_dev(const struct device *dev)
1722 {
1723         return dev->release == iscsi_session_release;
1724 }
1725 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1726
1727 static int iscsi_iter_session_fn(struct device *dev, void *data)
1728 {
1729         void (* fn) (struct iscsi_cls_session *) = data;
1730
1731         if (!iscsi_is_session_dev(dev))
1732                 return 0;
1733         fn(iscsi_dev_to_session(dev));
1734         return 0;
1735 }
1736
1737 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1738                                  void (*fn)(struct iscsi_cls_session *))
1739 {
1740         device_for_each_child(&shost->shost_gendev, fn,
1741                               iscsi_iter_session_fn);
1742 }
1743 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1744
1745 struct iscsi_scan_data {
1746         unsigned int channel;
1747         unsigned int id;
1748         u64 lun;
1749         enum scsi_scan_mode rescan;
1750 };
1751
1752 static int iscsi_user_scan_session(struct device *dev, void *data)
1753 {
1754         struct iscsi_scan_data *scan_data = data;
1755         struct iscsi_cls_session *session;
1756         struct Scsi_Host *shost;
1757         struct iscsi_cls_host *ihost;
1758         unsigned long flags;
1759         unsigned int id;
1760
1761         if (!iscsi_is_session_dev(dev))
1762                 return 0;
1763
1764         session = iscsi_dev_to_session(dev);
1765
1766         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1767
1768         shost = iscsi_session_to_shost(session);
1769         ihost = shost->shost_data;
1770
1771         mutex_lock(&ihost->mutex);
1772         spin_lock_irqsave(&session->lock, flags);
1773         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1774                 spin_unlock_irqrestore(&session->lock, flags);
1775                 goto user_scan_exit;
1776         }
1777         id = session->target_id;
1778         spin_unlock_irqrestore(&session->lock, flags);
1779
1780         if (id != ISCSI_MAX_TARGET) {
1781                 if ((scan_data->channel == SCAN_WILD_CARD ||
1782                      scan_data->channel == 0) &&
1783                     (scan_data->id == SCAN_WILD_CARD ||
1784                      scan_data->id == id))
1785                         scsi_scan_target(&session->dev, 0, id,
1786                                          scan_data->lun, scan_data->rescan);
1787         }
1788
1789 user_scan_exit:
1790         mutex_unlock(&ihost->mutex);
1791         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1792         return 0;
1793 }
1794
1795 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1796                            uint id, u64 lun)
1797 {
1798         struct iscsi_scan_data scan_data;
1799
1800         scan_data.channel = channel;
1801         scan_data.id = id;
1802         scan_data.lun = lun;
1803         scan_data.rescan = SCSI_SCAN_MANUAL;
1804
1805         return device_for_each_child(&shost->shost_gendev, &scan_data,
1806                                      iscsi_user_scan_session);
1807 }
1808
1809 static void iscsi_scan_session(struct work_struct *work)
1810 {
1811         struct iscsi_cls_session *session =
1812                         container_of(work, struct iscsi_cls_session, scan_work);
1813         struct iscsi_scan_data scan_data;
1814
1815         scan_data.channel = 0;
1816         scan_data.id = SCAN_WILD_CARD;
1817         scan_data.lun = SCAN_WILD_CARD;
1818         scan_data.rescan = SCSI_SCAN_RESCAN;
1819
1820         iscsi_user_scan_session(&session->dev, &scan_data);
1821 }
1822
1823 /**
1824  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1825  * @cmd: scsi cmd passed to scsi eh handler
1826  *
1827  * If the session is down this function will wait for the recovery
1828  * timer to fire or for the session to be logged back in. If the
1829  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1830  * should pass this error value to the scsi eh.
1831  */
1832 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1833 {
1834         struct iscsi_cls_session *session =
1835                         starget_to_session(scsi_target(cmd->device));
1836         unsigned long flags;
1837         int ret = 0;
1838
1839         spin_lock_irqsave(&session->lock, flags);
1840         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1841                 if (session->state == ISCSI_SESSION_FREE) {
1842                         ret = FAST_IO_FAIL;
1843                         break;
1844                 }
1845                 spin_unlock_irqrestore(&session->lock, flags);
1846                 msleep(1000);
1847                 spin_lock_irqsave(&session->lock, flags);
1848         }
1849         spin_unlock_irqrestore(&session->lock, flags);
1850         return ret;
1851 }
1852 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1853
1854 static void session_recovery_timedout(struct work_struct *work)
1855 {
1856         struct iscsi_cls_session *session =
1857                 container_of(work, struct iscsi_cls_session,
1858                              recovery_work.work);
1859         unsigned long flags;
1860
1861         iscsi_cls_session_printk(KERN_INFO, session,
1862                                  "session recovery timed out after %d secs\n",
1863                                  session->recovery_tmo);
1864
1865         spin_lock_irqsave(&session->lock, flags);
1866         switch (session->state) {
1867         case ISCSI_SESSION_FAILED:
1868                 session->state = ISCSI_SESSION_FREE;
1869                 break;
1870         case ISCSI_SESSION_LOGGED_IN:
1871         case ISCSI_SESSION_FREE:
1872                 /* we raced with the unblock's flush */
1873                 spin_unlock_irqrestore(&session->lock, flags);
1874                 return;
1875         }
1876         spin_unlock_irqrestore(&session->lock, flags);
1877
1878         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1879         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1880         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1881
1882         if (session->transport->session_recovery_timedout)
1883                 session->transport->session_recovery_timedout(session);
1884 }
1885
1886 static void __iscsi_unblock_session(struct work_struct *work)
1887 {
1888         struct iscsi_cls_session *session =
1889                         container_of(work, struct iscsi_cls_session,
1890                                      unblock_work);
1891         unsigned long flags;
1892
1893         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1894
1895         cancel_delayed_work_sync(&session->recovery_work);
1896         spin_lock_irqsave(&session->lock, flags);
1897         session->state = ISCSI_SESSION_LOGGED_IN;
1898         spin_unlock_irqrestore(&session->lock, flags);
1899         /* start IO */
1900         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1901         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1902 }
1903
1904 /**
1905  * iscsi_unblock_session - set a session as logged in and start IO.
1906  * @session: iscsi session
1907  *
1908  * Mark a session as ready to accept IO.
1909  */
1910 void iscsi_unblock_session(struct iscsi_cls_session *session)
1911 {
1912         if (!cancel_work_sync(&session->block_work))
1913                 cancel_delayed_work_sync(&session->recovery_work);
1914
1915         queue_work(session->workq, &session->unblock_work);
1916         /*
1917          * Blocking the session can be done from any context so we only
1918          * queue the block work. Make sure the unblock work has completed
1919          * because it flushes/cancels the other works and updates the state.
1920          */
1921         flush_work(&session->unblock_work);
1922 }
1923 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1924
1925 static void __iscsi_block_session(struct work_struct *work)
1926 {
1927         struct iscsi_cls_session *session =
1928                         container_of(work, struct iscsi_cls_session,
1929                                      block_work);
1930         unsigned long flags;
1931
1932         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1933         spin_lock_irqsave(&session->lock, flags);
1934         session->state = ISCSI_SESSION_FAILED;
1935         spin_unlock_irqrestore(&session->lock, flags);
1936         scsi_target_block(&session->dev);
1937         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1938         if (session->recovery_tmo >= 0)
1939                 queue_delayed_work(session->workq,
1940                                    &session->recovery_work,
1941                                    session->recovery_tmo * HZ);
1942 }
1943
1944 void iscsi_block_session(struct iscsi_cls_session *session)
1945 {
1946         queue_work(session->workq, &session->block_work);
1947 }
1948 EXPORT_SYMBOL_GPL(iscsi_block_session);
1949
1950 static void __iscsi_unbind_session(struct work_struct *work)
1951 {
1952         struct iscsi_cls_session *session =
1953                         container_of(work, struct iscsi_cls_session,
1954                                      unbind_work);
1955         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1956         struct iscsi_cls_host *ihost = shost->shost_data;
1957         unsigned long flags;
1958         unsigned int target_id;
1959
1960         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1961
1962         /* Prevent new scans and make sure scanning is not in progress */
1963         mutex_lock(&ihost->mutex);
1964         spin_lock_irqsave(&session->lock, flags);
1965         if (session->target_id == ISCSI_MAX_TARGET) {
1966                 spin_unlock_irqrestore(&session->lock, flags);
1967                 mutex_unlock(&ihost->mutex);
1968                 goto unbind_session_exit;
1969         }
1970
1971         target_id = session->target_id;
1972         session->target_id = ISCSI_MAX_TARGET;
1973         spin_unlock_irqrestore(&session->lock, flags);
1974         mutex_unlock(&ihost->mutex);
1975
1976         scsi_remove_target(&session->dev);
1977
1978         if (session->ida_used)
1979                 ida_simple_remove(&iscsi_sess_ida, target_id);
1980
1981 unbind_session_exit:
1982         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1983         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1984 }
1985
1986 static void __iscsi_destroy_session(struct work_struct *work)
1987 {
1988         struct iscsi_cls_session *session =
1989                 container_of(work, struct iscsi_cls_session, destroy_work);
1990
1991         session->transport->destroy_session(session);
1992 }
1993
1994 struct iscsi_cls_session *
1995 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1996                     int dd_size)
1997 {
1998         struct iscsi_cls_session *session;
1999
2000         session = kzalloc(sizeof(*session) + dd_size,
2001                           GFP_KERNEL);
2002         if (!session)
2003                 return NULL;
2004
2005         session->transport = transport;
2006         session->creator = -1;
2007         session->recovery_tmo = 120;
2008         session->recovery_tmo_sysfs_override = false;
2009         session->state = ISCSI_SESSION_FREE;
2010         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2011         INIT_LIST_HEAD(&session->sess_list);
2012         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2013         INIT_WORK(&session->block_work, __iscsi_block_session);
2014         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2015         INIT_WORK(&session->scan_work, iscsi_scan_session);
2016         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2017         spin_lock_init(&session->lock);
2018
2019         /* this is released in the dev's release function */
2020         scsi_host_get(shost);
2021         session->dev.parent = &shost->shost_gendev;
2022         session->dev.release = iscsi_session_release;
2023         device_initialize(&session->dev);
2024         if (dd_size)
2025                 session->dd_data = &session[1];
2026
2027         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2028         return session;
2029 }
2030 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2031
2032 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2033 {
2034         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2035         unsigned long flags;
2036         int id = 0;
2037         int err;
2038
2039         session->sid = atomic_add_return(1, &iscsi_session_nr);
2040
2041         session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2042                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2043                         shost->host_no, session->sid);
2044         if (!session->workq)
2045                 return -ENOMEM;
2046
2047         if (target_id == ISCSI_MAX_TARGET) {
2048                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2049
2050                 if (id < 0) {
2051                         iscsi_cls_session_printk(KERN_ERR, session,
2052                                         "Failure in Target ID Allocation\n");
2053                         err = id;
2054                         goto destroy_wq;
2055                 }
2056                 session->target_id = (unsigned int)id;
2057                 session->ida_used = true;
2058         } else
2059                 session->target_id = target_id;
2060
2061         dev_set_name(&session->dev, "session%u", session->sid);
2062         err = device_add(&session->dev);
2063         if (err) {
2064                 iscsi_cls_session_printk(KERN_ERR, session,
2065                                          "could not register session's dev\n");
2066                 goto release_ida;
2067         }
2068         err = transport_register_device(&session->dev);
2069         if (err) {
2070                 iscsi_cls_session_printk(KERN_ERR, session,
2071                                          "could not register transport's dev\n");
2072                 goto release_dev;
2073         }
2074
2075         spin_lock_irqsave(&sesslock, flags);
2076         list_add(&session->sess_list, &sesslist);
2077         spin_unlock_irqrestore(&sesslock, flags);
2078
2079         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2080         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2081         return 0;
2082
2083 release_dev:
2084         device_del(&session->dev);
2085 release_ida:
2086         if (session->ida_used)
2087                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2088 destroy_wq:
2089         destroy_workqueue(session->workq);
2090         return err;
2091 }
2092 EXPORT_SYMBOL_GPL(iscsi_add_session);
2093
2094 /**
2095  * iscsi_create_session - create iscsi class session
2096  * @shost: scsi host
2097  * @transport: iscsi transport
2098  * @dd_size: private driver data size
2099  * @target_id: which target
2100  *
2101  * This can be called from a LLD or iscsi_transport.
2102  */
2103 struct iscsi_cls_session *
2104 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2105                      int dd_size, unsigned int target_id)
2106 {
2107         struct iscsi_cls_session *session;
2108
2109         session = iscsi_alloc_session(shost, transport, dd_size);
2110         if (!session)
2111                 return NULL;
2112
2113         if (iscsi_add_session(session, target_id)) {
2114                 iscsi_free_session(session);
2115                 return NULL;
2116         }
2117         return session;
2118 }
2119 EXPORT_SYMBOL_GPL(iscsi_create_session);
2120
2121 static void iscsi_conn_release(struct device *dev)
2122 {
2123         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2124         struct device *parent = conn->dev.parent;
2125
2126         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2127         kfree(conn);
2128         put_device(parent);
2129 }
2130
2131 static int iscsi_is_conn_dev(const struct device *dev)
2132 {
2133         return dev->release == iscsi_conn_release;
2134 }
2135
2136 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2137 {
2138         if (!iscsi_is_conn_dev(dev))
2139                 return 0;
2140
2141         iscsi_remove_conn(iscsi_dev_to_conn(dev));
2142         iscsi_put_conn(iscsi_dev_to_conn(dev));
2143
2144         return 0;
2145 }
2146
2147 void iscsi_remove_session(struct iscsi_cls_session *session)
2148 {
2149         unsigned long flags;
2150         int err;
2151
2152         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2153
2154         spin_lock_irqsave(&sesslock, flags);
2155         if (!list_empty(&session->sess_list))
2156                 list_del(&session->sess_list);
2157         spin_unlock_irqrestore(&sesslock, flags);
2158
2159         if (!cancel_work_sync(&session->block_work))
2160                 cancel_delayed_work_sync(&session->recovery_work);
2161         cancel_work_sync(&session->unblock_work);
2162         /*
2163          * If we are blocked let commands flow again. The lld or iscsi
2164          * layer should set up the queuecommand to fail commands.
2165          * We assume that LLD will not be calling block/unblock while
2166          * removing the session.
2167          */
2168         spin_lock_irqsave(&session->lock, flags);
2169         session->state = ISCSI_SESSION_FREE;
2170         spin_unlock_irqrestore(&session->lock, flags);
2171
2172         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2173         /*
2174          * qla4xxx can perform it's own scans when it runs in kernel only
2175          * mode. Make sure to flush those scans.
2176          */
2177         flush_work(&session->scan_work);
2178         /* flush running unbind operations */
2179         flush_work(&session->unbind_work);
2180         __iscsi_unbind_session(&session->unbind_work);
2181
2182         /* hw iscsi may not have removed all connections from session */
2183         err = device_for_each_child(&session->dev, NULL,
2184                                     iscsi_iter_destroy_conn_fn);
2185         if (err)
2186                 iscsi_cls_session_printk(KERN_ERR, session,
2187                                          "Could not delete all connections "
2188                                          "for session. Error %d.\n", err);
2189
2190         transport_unregister_device(&session->dev);
2191
2192         destroy_workqueue(session->workq);
2193
2194         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2195         device_del(&session->dev);
2196 }
2197 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2198
2199 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2200 {
2201         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2202
2203         switch (flag) {
2204         case STOP_CONN_RECOVER:
2205                 conn->state = ISCSI_CONN_FAILED;
2206                 break;
2207         case STOP_CONN_TERM:
2208                 conn->state = ISCSI_CONN_DOWN;
2209                 break;
2210         default:
2211                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2212                                       flag);
2213                 return;
2214         }
2215
2216         conn->transport->stop_conn(conn, flag);
2217         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2218 }
2219
2220 static int iscsi_if_stop_conn(struct iscsi_transport *transport,
2221                               struct iscsi_uevent *ev)
2222 {
2223         int flag = ev->u.stop_conn.flag;
2224         struct iscsi_cls_conn *conn;
2225
2226         conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2227         if (!conn)
2228                 return -EINVAL;
2229
2230         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2231         /*
2232          * If this is a termination we have to call stop_conn with that flag
2233          * so the correct states get set. If we haven't run the work yet try to
2234          * avoid the extra run.
2235          */
2236         if (flag == STOP_CONN_TERM) {
2237                 cancel_work_sync(&conn->cleanup_work);
2238                 iscsi_stop_conn(conn, flag);
2239         } else {
2240                 /*
2241                  * Figure out if it was the kernel or userspace initiating this.
2242                  */
2243                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2244                         iscsi_stop_conn(conn, flag);
2245                 } else {
2246                         ISCSI_DBG_TRANS_CONN(conn,
2247                                              "flush kernel conn cleanup.\n");
2248                         flush_work(&conn->cleanup_work);
2249                 }
2250                 /*
2251                  * Only clear for recovery to avoid extra cleanup runs during
2252                  * termination.
2253                  */
2254                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2255         }
2256         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2257         return 0;
2258 }
2259
2260 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2261 {
2262         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2263         struct iscsi_endpoint *ep;
2264
2265         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2266         conn->state = ISCSI_CONN_FAILED;
2267
2268         if (!conn->ep || !session->transport->ep_disconnect)
2269                 return;
2270
2271         ep = conn->ep;
2272         conn->ep = NULL;
2273
2274         session->transport->unbind_conn(conn, is_active);
2275         session->transport->ep_disconnect(ep);
2276         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2277 }
2278
2279 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2280 {
2281         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2282                                                    cleanup_work);
2283         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2284
2285         mutex_lock(&conn->ep_mutex);
2286         /*
2287          * If we are not at least bound there is nothing for us to do. Userspace
2288          * will do a ep_disconnect call if offload is used, but will not be
2289          * doing a stop since there is nothing to clean up, so we have to clear
2290          * the cleanup bit here.
2291          */
2292         if (conn->state != ISCSI_CONN_BOUND && conn->state != ISCSI_CONN_UP) {
2293                 ISCSI_DBG_TRANS_CONN(conn, "Got error while conn is already failed. Ignoring.\n");
2294                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2295                 mutex_unlock(&conn->ep_mutex);
2296                 return;
2297         }
2298
2299         iscsi_ep_disconnect(conn, false);
2300
2301         if (system_state != SYSTEM_RUNNING) {
2302                 /*
2303                  * If the user has set up for the session to never timeout
2304                  * then hang like they wanted. For all other cases fail right
2305                  * away since userspace is not going to relogin.
2306                  */
2307                 if (session->recovery_tmo > 0)
2308                         session->recovery_tmo = 0;
2309         }
2310
2311         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2312         mutex_unlock(&conn->ep_mutex);
2313         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2314 }
2315
2316 void iscsi_free_session(struct iscsi_cls_session *session)
2317 {
2318         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2319         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2320         put_device(&session->dev);
2321 }
2322 EXPORT_SYMBOL_GPL(iscsi_free_session);
2323
2324 /**
2325  * iscsi_alloc_conn - alloc iscsi class connection
2326  * @session: iscsi cls session
2327  * @dd_size: private driver data size
2328  * @cid: connection id
2329  */
2330 struct iscsi_cls_conn *
2331 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2332 {
2333         struct iscsi_transport *transport = session->transport;
2334         struct iscsi_cls_conn *conn;
2335
2336         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2337         if (!conn)
2338                 return NULL;
2339         if (dd_size)
2340                 conn->dd_data = &conn[1];
2341
2342         mutex_init(&conn->ep_mutex);
2343         INIT_LIST_HEAD(&conn->conn_list);
2344         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2345         conn->transport = transport;
2346         conn->cid = cid;
2347         conn->state = ISCSI_CONN_DOWN;
2348
2349         /* this is released in the dev's release function */
2350         if (!get_device(&session->dev))
2351                 goto free_conn;
2352
2353         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2354         device_initialize(&conn->dev);
2355         conn->dev.parent = &session->dev;
2356         conn->dev.release = iscsi_conn_release;
2357
2358         return conn;
2359
2360 free_conn:
2361         kfree(conn);
2362         return NULL;
2363 }
2364 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2365
2366 /**
2367  * iscsi_add_conn - add iscsi class connection
2368  * @conn: iscsi cls connection
2369  *
2370  * This will expose iscsi_cls_conn to sysfs so make sure the related
2371  * resources for sysfs attributes are initialized before calling this.
2372  */
2373 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2374 {
2375         int err;
2376         unsigned long flags;
2377         struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2378
2379         err = device_add(&conn->dev);
2380         if (err) {
2381                 iscsi_cls_session_printk(KERN_ERR, session,
2382                                          "could not register connection's dev\n");
2383                 return err;
2384         }
2385         err = transport_register_device(&conn->dev);
2386         if (err) {
2387                 iscsi_cls_session_printk(KERN_ERR, session,
2388                                          "could not register transport's dev\n");
2389                 device_del(&conn->dev);
2390                 return err;
2391         }
2392
2393         spin_lock_irqsave(&connlock, flags);
2394         list_add(&conn->conn_list, &connlist);
2395         spin_unlock_irqrestore(&connlock, flags);
2396
2397         return 0;
2398 }
2399 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2400
2401 /**
2402  * iscsi_remove_conn - remove iscsi class connection from sysfs
2403  * @conn: iscsi cls connection
2404  *
2405  * Remove iscsi_cls_conn from sysfs, and wait for previous
2406  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2407  */
2408 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2409 {
2410         unsigned long flags;
2411
2412         spin_lock_irqsave(&connlock, flags);
2413         list_del(&conn->conn_list);
2414         spin_unlock_irqrestore(&connlock, flags);
2415
2416         transport_unregister_device(&conn->dev);
2417         device_del(&conn->dev);
2418 }
2419 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2420
2421 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2422 {
2423         put_device(&conn->dev);
2424 }
2425 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2426
2427 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2428 {
2429         get_device(&conn->dev);
2430 }
2431 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2432
2433 /*
2434  * iscsi interface functions
2435  */
2436 static struct iscsi_internal *
2437 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2438 {
2439         struct iscsi_internal *priv;
2440         unsigned long flags;
2441
2442         spin_lock_irqsave(&iscsi_transport_lock, flags);
2443         list_for_each_entry(priv, &iscsi_transports, list) {
2444                 if (tt == priv->iscsi_transport) {
2445                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2446                         return priv;
2447                 }
2448         }
2449         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2450         return NULL;
2451 }
2452
2453 static int
2454 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2455 {
2456         return nlmsg_multicast(nls, skb, 0, group, gfp);
2457 }
2458
2459 static int
2460 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2461 {
2462         return nlmsg_unicast(nls, skb, portid);
2463 }
2464
2465 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2466                    char *data, uint32_t data_size)
2467 {
2468         struct nlmsghdr *nlh;
2469         struct sk_buff *skb;
2470         struct iscsi_uevent *ev;
2471         char *pdu;
2472         struct iscsi_internal *priv;
2473         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2474                                    data_size);
2475
2476         priv = iscsi_if_transport_lookup(conn->transport);
2477         if (!priv)
2478                 return -EINVAL;
2479
2480         skb = alloc_skb(len, GFP_ATOMIC);
2481         if (!skb) {
2482                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2483                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2484                                       "control PDU: OOM\n");
2485                 return -ENOMEM;
2486         }
2487
2488         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2489         ev = nlmsg_data(nlh);
2490         memset(ev, 0, sizeof(*ev));
2491         ev->transport_handle = iscsi_handle(conn->transport);
2492         ev->type = ISCSI_KEVENT_RECV_PDU;
2493         ev->r.recv_req.cid = conn->cid;
2494         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2495         pdu = (char*)ev + sizeof(*ev);
2496         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2497         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2498
2499         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2500 }
2501 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2502
2503 int iscsi_offload_mesg(struct Scsi_Host *shost,
2504                        struct iscsi_transport *transport, uint32_t type,
2505                        char *data, uint16_t data_size)
2506 {
2507         struct nlmsghdr *nlh;
2508         struct sk_buff *skb;
2509         struct iscsi_uevent *ev;
2510         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2511
2512         skb = alloc_skb(len, GFP_ATOMIC);
2513         if (!skb) {
2514                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2515                 return -ENOMEM;
2516         }
2517
2518         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2519         ev = nlmsg_data(nlh);
2520         memset(ev, 0, sizeof(*ev));
2521         ev->type = type;
2522         ev->transport_handle = iscsi_handle(transport);
2523         switch (type) {
2524         case ISCSI_KEVENT_PATH_REQ:
2525                 ev->r.req_path.host_no = shost->host_no;
2526                 break;
2527         case ISCSI_KEVENT_IF_DOWN:
2528                 ev->r.notify_if_down.host_no = shost->host_no;
2529                 break;
2530         }
2531
2532         memcpy((char *)ev + sizeof(*ev), data, data_size);
2533
2534         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2535 }
2536 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2537
2538 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2539 {
2540         struct nlmsghdr *nlh;
2541         struct sk_buff  *skb;
2542         struct iscsi_uevent *ev;
2543         struct iscsi_internal *priv;
2544         int len = nlmsg_total_size(sizeof(*ev));
2545
2546         if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags))
2547                 queue_work(iscsi_conn_cleanup_workq, &conn->cleanup_work);
2548
2549         priv = iscsi_if_transport_lookup(conn->transport);
2550         if (!priv)
2551                 return;
2552
2553         skb = alloc_skb(len, GFP_ATOMIC);
2554         if (!skb) {
2555                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2556                                       "conn error (%d)\n", error);
2557                 return;
2558         }
2559
2560         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2561         ev = nlmsg_data(nlh);
2562         ev->transport_handle = iscsi_handle(conn->transport);
2563         ev->type = ISCSI_KEVENT_CONN_ERROR;
2564         ev->r.connerror.error = error;
2565         ev->r.connerror.cid = conn->cid;
2566         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2567
2568         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2569
2570         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2571                               error);
2572 }
2573 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2574
2575 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2576                             enum iscsi_conn_state state)
2577 {
2578         struct nlmsghdr *nlh;
2579         struct sk_buff  *skb;
2580         struct iscsi_uevent *ev;
2581         struct iscsi_internal *priv;
2582         int len = nlmsg_total_size(sizeof(*ev));
2583
2584         priv = iscsi_if_transport_lookup(conn->transport);
2585         if (!priv)
2586                 return;
2587
2588         skb = alloc_skb(len, GFP_ATOMIC);
2589         if (!skb) {
2590                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2591                                       "conn login (%d)\n", state);
2592                 return;
2593         }
2594
2595         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2596         ev = nlmsg_data(nlh);
2597         ev->transport_handle = iscsi_handle(conn->transport);
2598         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2599         ev->r.conn_login.state = state;
2600         ev->r.conn_login.cid = conn->cid;
2601         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2602         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2603
2604         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2605                               state);
2606 }
2607 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2608
2609 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2610                            enum iscsi_host_event_code code, uint32_t data_size,
2611                            uint8_t *data)
2612 {
2613         struct nlmsghdr *nlh;
2614         struct sk_buff *skb;
2615         struct iscsi_uevent *ev;
2616         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2617
2618         skb = alloc_skb(len, GFP_NOIO);
2619         if (!skb) {
2620                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2621                        host_no, code);
2622                 return;
2623         }
2624
2625         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2626         ev = nlmsg_data(nlh);
2627         ev->transport_handle = iscsi_handle(transport);
2628         ev->type = ISCSI_KEVENT_HOST_EVENT;
2629         ev->r.host_event.host_no = host_no;
2630         ev->r.host_event.code = code;
2631         ev->r.host_event.data_size = data_size;
2632
2633         if (data_size)
2634                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2635
2636         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2637 }
2638 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2639
2640 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2641                            uint32_t status, uint32_t pid, uint32_t data_size,
2642                            uint8_t *data)
2643 {
2644         struct nlmsghdr *nlh;
2645         struct sk_buff *skb;
2646         struct iscsi_uevent *ev;
2647         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2648
2649         skb = alloc_skb(len, GFP_NOIO);
2650         if (!skb) {
2651                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2652                 return;
2653         }
2654
2655         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2656         ev = nlmsg_data(nlh);
2657         ev->transport_handle = iscsi_handle(transport);
2658         ev->type = ISCSI_KEVENT_PING_COMP;
2659         ev->r.ping_comp.host_no = host_no;
2660         ev->r.ping_comp.status = status;
2661         ev->r.ping_comp.pid = pid;
2662         ev->r.ping_comp.data_size = data_size;
2663         memcpy((char *)ev + sizeof(*ev), data, data_size);
2664
2665         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2666 }
2667 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2668
2669 static int
2670 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2671 {
2672         struct sk_buff  *skb;
2673         struct nlmsghdr *nlh;
2674         int len = nlmsg_total_size(size);
2675
2676         skb = alloc_skb(len, GFP_ATOMIC);
2677         if (!skb) {
2678                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2679                 return -ENOMEM;
2680         }
2681
2682         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2683         memcpy(nlmsg_data(nlh), payload, size);
2684         return iscsi_unicast_skb(skb, portid);
2685 }
2686
2687 static int
2688 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2689 {
2690         struct iscsi_uevent *ev = nlmsg_data(nlh);
2691         struct iscsi_stats *stats;
2692         struct sk_buff *skbstat;
2693         struct iscsi_cls_conn *conn;
2694         struct nlmsghdr *nlhstat;
2695         struct iscsi_uevent *evstat;
2696         struct iscsi_internal *priv;
2697         int len = nlmsg_total_size(sizeof(*ev) +
2698                                    sizeof(struct iscsi_stats) +
2699                                    sizeof(struct iscsi_stats_custom) *
2700                                    ISCSI_STATS_CUSTOM_MAX);
2701         int err = 0;
2702
2703         priv = iscsi_if_transport_lookup(transport);
2704         if (!priv)
2705                 return -EINVAL;
2706
2707         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2708         if (!conn)
2709                 return -EEXIST;
2710
2711         do {
2712                 int actual_size;
2713
2714                 skbstat = alloc_skb(len, GFP_ATOMIC);
2715                 if (!skbstat) {
2716                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2717                                               "deliver stats: OOM\n");
2718                         return -ENOMEM;
2719                 }
2720
2721                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2722                                       (len - sizeof(*nlhstat)), 0);
2723                 evstat = nlmsg_data(nlhstat);
2724                 memset(evstat, 0, sizeof(*evstat));
2725                 evstat->transport_handle = iscsi_handle(conn->transport);
2726                 evstat->type = nlh->nlmsg_type;
2727                 evstat->u.get_stats.cid =
2728                         ev->u.get_stats.cid;
2729                 evstat->u.get_stats.sid =
2730                         ev->u.get_stats.sid;
2731                 stats = (struct iscsi_stats *)
2732                         ((char*)evstat + sizeof(*evstat));
2733                 memset(stats, 0, sizeof(*stats));
2734
2735                 transport->get_stats(conn, stats);
2736                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2737                                                sizeof(struct iscsi_stats) +
2738                                                sizeof(struct iscsi_stats_custom) *
2739                                                stats->custom_length);
2740                 actual_size -= sizeof(*nlhstat);
2741                 actual_size = nlmsg_msg_size(actual_size);
2742                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2743                 nlhstat->nlmsg_len = actual_size;
2744
2745                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2746                                           GFP_ATOMIC);
2747         } while (err < 0 && err != -ECONNREFUSED);
2748
2749         return err;
2750 }
2751
2752 /**
2753  * iscsi_session_event - send session destr. completion event
2754  * @session: iscsi class session
2755  * @event: type of event
2756  */
2757 int iscsi_session_event(struct iscsi_cls_session *session,
2758                         enum iscsi_uevent_e event)
2759 {
2760         struct iscsi_internal *priv;
2761         struct Scsi_Host *shost;
2762         struct iscsi_uevent *ev;
2763         struct sk_buff  *skb;
2764         struct nlmsghdr *nlh;
2765         int rc, len = nlmsg_total_size(sizeof(*ev));
2766
2767         priv = iscsi_if_transport_lookup(session->transport);
2768         if (!priv)
2769                 return -EINVAL;
2770         shost = iscsi_session_to_shost(session);
2771
2772         skb = alloc_skb(len, GFP_KERNEL);
2773         if (!skb) {
2774                 iscsi_cls_session_printk(KERN_ERR, session,
2775                                          "Cannot notify userspace of session "
2776                                          "event %u\n", event);
2777                 return -ENOMEM;
2778         }
2779
2780         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2781         ev = nlmsg_data(nlh);
2782         ev->transport_handle = iscsi_handle(session->transport);
2783
2784         ev->type = event;
2785         switch (event) {
2786         case ISCSI_KEVENT_DESTROY_SESSION:
2787                 ev->r.d_session.host_no = shost->host_no;
2788                 ev->r.d_session.sid = session->sid;
2789                 break;
2790         case ISCSI_KEVENT_CREATE_SESSION:
2791                 ev->r.c_session_ret.host_no = shost->host_no;
2792                 ev->r.c_session_ret.sid = session->sid;
2793                 break;
2794         case ISCSI_KEVENT_UNBIND_SESSION:
2795                 ev->r.unbind_session.host_no = shost->host_no;
2796                 ev->r.unbind_session.sid = session->sid;
2797                 break;
2798         default:
2799                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2800                                          "%u.\n", event);
2801                 kfree_skb(skb);
2802                 return -EINVAL;
2803         }
2804
2805         /*
2806          * this will occur if the daemon is not up, so we just warn
2807          * the user and when the daemon is restarted it will handle it
2808          */
2809         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2810         if (rc == -ESRCH)
2811                 iscsi_cls_session_printk(KERN_ERR, session,
2812                                          "Cannot notify userspace of session "
2813                                          "event %u. Check iscsi daemon\n",
2814                                          event);
2815
2816         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2817                                 event, rc);
2818         return rc;
2819 }
2820 EXPORT_SYMBOL_GPL(iscsi_session_event);
2821
2822 static int
2823 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2824                         struct iscsi_uevent *ev, pid_t pid,
2825                         uint32_t initial_cmdsn, uint16_t cmds_max,
2826                         uint16_t queue_depth)
2827 {
2828         struct iscsi_transport *transport = priv->iscsi_transport;
2829         struct iscsi_cls_session *session;
2830         struct Scsi_Host *shost;
2831
2832         session = transport->create_session(ep, cmds_max, queue_depth,
2833                                             initial_cmdsn);
2834         if (!session)
2835                 return -ENOMEM;
2836
2837         session->creator = pid;
2838         shost = iscsi_session_to_shost(session);
2839         ev->r.c_session_ret.host_no = shost->host_no;
2840         ev->r.c_session_ret.sid = session->sid;
2841         ISCSI_DBG_TRANS_SESSION(session,
2842                                 "Completed creating transport session\n");
2843         return 0;
2844 }
2845
2846 static int
2847 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2848 {
2849         struct iscsi_cls_conn *conn;
2850         struct iscsi_cls_session *session;
2851
2852         session = iscsi_session_lookup(ev->u.c_conn.sid);
2853         if (!session) {
2854                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2855                        ev->u.c_conn.sid);
2856                 return -EINVAL;
2857         }
2858
2859         conn = transport->create_conn(session, ev->u.c_conn.cid);
2860         if (!conn) {
2861                 iscsi_cls_session_printk(KERN_ERR, session,
2862                                          "couldn't create a new connection.");
2863                 return -ENOMEM;
2864         }
2865
2866         ev->r.c_conn_ret.sid = session->sid;
2867         ev->r.c_conn_ret.cid = conn->cid;
2868
2869         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2870         return 0;
2871 }
2872
2873 static int
2874 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2875 {
2876         struct iscsi_cls_conn *conn;
2877
2878         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2879         if (!conn)
2880                 return -EINVAL;
2881
2882         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2883         flush_work(&conn->cleanup_work);
2884         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2885
2886         if (transport->destroy_conn)
2887                 transport->destroy_conn(conn);
2888         return 0;
2889 }
2890
2891 static int
2892 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2893 {
2894         char *data = (char*)ev + sizeof(*ev);
2895         struct iscsi_cls_conn *conn;
2896         struct iscsi_cls_session *session;
2897         int err = 0, value = 0;
2898
2899         if (ev->u.set_param.len > PAGE_SIZE)
2900                 return -EINVAL;
2901
2902         session = iscsi_session_lookup(ev->u.set_param.sid);
2903         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2904         if (!conn || !session)
2905                 return -EINVAL;
2906
2907         switch (ev->u.set_param.param) {
2908         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2909                 sscanf(data, "%d", &value);
2910                 if (!session->recovery_tmo_sysfs_override)
2911                         session->recovery_tmo = value;
2912                 break;
2913         default:
2914                 if ((conn->state == ISCSI_CONN_BOUND) ||
2915                         (conn->state == ISCSI_CONN_UP)) {
2916                         err = transport->set_param(conn, ev->u.set_param.param,
2917                                         data, ev->u.set_param.len);
2918                 } else {
2919                         return -ENOTCONN;
2920                 }
2921         }
2922
2923         return err;
2924 }
2925
2926 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2927                                struct iscsi_uevent *ev, int msg_type)
2928 {
2929         struct iscsi_endpoint *ep;
2930         struct sockaddr *dst_addr;
2931         struct Scsi_Host *shost = NULL;
2932         int non_blocking, err = 0;
2933
2934         if (!transport->ep_connect)
2935                 return -EINVAL;
2936
2937         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2938                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2939                 if (!shost) {
2940                         printk(KERN_ERR "ep connect failed. Could not find "
2941                                "host no %u\n",
2942                                ev->u.ep_connect_through_host.host_no);
2943                         return -ENODEV;
2944                 }
2945                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2946         } else
2947                 non_blocking = ev->u.ep_connect.non_blocking;
2948
2949         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2950         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2951         if (IS_ERR(ep)) {
2952                 err = PTR_ERR(ep);
2953                 goto release_host;
2954         }
2955
2956         ev->r.ep_connect_ret.handle = ep->id;
2957 release_host:
2958         if (shost)
2959                 scsi_host_put(shost);
2960         return err;
2961 }
2962
2963 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2964                                   u64 ep_handle)
2965 {
2966         struct iscsi_cls_conn *conn;
2967         struct iscsi_endpoint *ep;
2968
2969         if (!transport->ep_disconnect)
2970                 return -EINVAL;
2971
2972         ep = iscsi_lookup_endpoint(ep_handle);
2973         if (!ep)
2974                 return -EINVAL;
2975
2976         conn = ep->conn;
2977         if (!conn) {
2978                 /*
2979                  * conn was not even bound yet, so we can't get iscsi conn
2980                  * failures yet.
2981                  */
2982                 transport->ep_disconnect(ep);
2983                 goto put_ep;
2984         }
2985
2986         mutex_lock(&conn->ep_mutex);
2987         /* Check if this was a conn error and the kernel took ownership */
2988         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2989                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2990                 mutex_unlock(&conn->ep_mutex);
2991
2992                 flush_work(&conn->cleanup_work);
2993                 goto put_ep;
2994         }
2995
2996         iscsi_ep_disconnect(conn, false);
2997         mutex_unlock(&conn->ep_mutex);
2998 put_ep:
2999         iscsi_put_endpoint(ep);
3000         return 0;
3001 }
3002
3003 static int
3004 iscsi_if_transport_ep(struct iscsi_transport *transport,
3005                       struct iscsi_uevent *ev, int msg_type)
3006 {
3007         struct iscsi_endpoint *ep;
3008         int rc = 0;
3009
3010         switch (msg_type) {
3011         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3012         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3013                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3014                 break;
3015         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3016                 if (!transport->ep_poll)
3017                         return -EINVAL;
3018
3019                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3020                 if (!ep)
3021                         return -EINVAL;
3022
3023                 ev->r.retcode = transport->ep_poll(ep,
3024                                                    ev->u.ep_poll.timeout_ms);
3025                 iscsi_put_endpoint(ep);
3026                 break;
3027         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3028                 rc = iscsi_if_ep_disconnect(transport,
3029                                             ev->u.ep_disconnect.ep_handle);
3030                 break;
3031         }
3032         return rc;
3033 }
3034
3035 static int
3036 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3037                 struct iscsi_uevent *ev)
3038 {
3039         struct Scsi_Host *shost;
3040         struct sockaddr *dst_addr;
3041         int err;
3042
3043         if (!transport->tgt_dscvr)
3044                 return -EINVAL;
3045
3046         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3047         if (!shost) {
3048                 printk(KERN_ERR "target discovery could not find host no %u\n",
3049                        ev->u.tgt_dscvr.host_no);
3050                 return -ENODEV;
3051         }
3052
3053
3054         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3055         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3056                                    ev->u.tgt_dscvr.enable, dst_addr);
3057         scsi_host_put(shost);
3058         return err;
3059 }
3060
3061 static int
3062 iscsi_set_host_param(struct iscsi_transport *transport,
3063                      struct iscsi_uevent *ev)
3064 {
3065         char *data = (char*)ev + sizeof(*ev);
3066         struct Scsi_Host *shost;
3067         int err;
3068
3069         if (!transport->set_host_param)
3070                 return -ENOSYS;
3071
3072         if (ev->u.set_host_param.len > PAGE_SIZE)
3073                 return -EINVAL;
3074
3075         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3076         if (!shost) {
3077                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3078                        ev->u.set_host_param.host_no);
3079                 return -ENODEV;
3080         }
3081
3082         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3083                                         data, ev->u.set_host_param.len);
3084         scsi_host_put(shost);
3085         return err;
3086 }
3087
3088 static int
3089 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3090 {
3091         struct Scsi_Host *shost;
3092         struct iscsi_path *params;
3093         int err;
3094
3095         if (!transport->set_path)
3096                 return -ENOSYS;
3097
3098         shost = scsi_host_lookup(ev->u.set_path.host_no);
3099         if (!shost) {
3100                 printk(KERN_ERR "set path could not find host no %u\n",
3101                        ev->u.set_path.host_no);
3102                 return -ENODEV;
3103         }
3104
3105         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3106         err = transport->set_path(shost, params);
3107
3108         scsi_host_put(shost);
3109         return err;
3110 }
3111
3112 static int iscsi_session_has_conns(int sid)
3113 {
3114         struct iscsi_cls_conn *conn;
3115         unsigned long flags;
3116         int found = 0;
3117
3118         spin_lock_irqsave(&connlock, flags);
3119         list_for_each_entry(conn, &connlist, conn_list) {
3120                 if (iscsi_conn_get_sid(conn) == sid) {
3121                         found = 1;
3122                         break;
3123                 }
3124         }
3125         spin_unlock_irqrestore(&connlock, flags);
3126
3127         return found;
3128 }
3129
3130 static int
3131 iscsi_set_iface_params(struct iscsi_transport *transport,
3132                        struct iscsi_uevent *ev, uint32_t len)
3133 {
3134         char *data = (char *)ev + sizeof(*ev);
3135         struct Scsi_Host *shost;
3136         int err;
3137
3138         if (!transport->set_iface_param)
3139                 return -ENOSYS;
3140
3141         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3142         if (!shost) {
3143                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3144                        ev->u.set_iface_params.host_no);
3145                 return -ENODEV;
3146         }
3147
3148         err = transport->set_iface_param(shost, data, len);
3149         scsi_host_put(shost);
3150         return err;
3151 }
3152
3153 static int
3154 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3155 {
3156         struct Scsi_Host *shost;
3157         struct sockaddr *dst_addr;
3158         int err;
3159
3160         if (!transport->send_ping)
3161                 return -ENOSYS;
3162
3163         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3164         if (!shost) {
3165                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3166                        ev->u.iscsi_ping.host_no);
3167                 return -ENODEV;
3168         }
3169
3170         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3171         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3172                                    ev->u.iscsi_ping.iface_type,
3173                                    ev->u.iscsi_ping.payload_size,
3174                                    ev->u.iscsi_ping.pid,
3175                                    dst_addr);
3176         scsi_host_put(shost);
3177         return err;
3178 }
3179
3180 static int
3181 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3182 {
3183         struct iscsi_uevent *ev = nlmsg_data(nlh);
3184         struct Scsi_Host *shost = NULL;
3185         struct iscsi_chap_rec *chap_rec;
3186         struct iscsi_internal *priv;
3187         struct sk_buff *skbchap;
3188         struct nlmsghdr *nlhchap;
3189         struct iscsi_uevent *evchap;
3190         uint32_t chap_buf_size;
3191         int len, err = 0;
3192         char *buf;
3193
3194         if (!transport->get_chap)
3195                 return -EINVAL;
3196
3197         priv = iscsi_if_transport_lookup(transport);
3198         if (!priv)
3199                 return -EINVAL;
3200
3201         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3202         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3203
3204         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3205         if (!shost) {
3206                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3207                        __func__, ev->u.get_chap.host_no);
3208                 return -ENODEV;
3209         }
3210
3211         do {
3212                 int actual_size;
3213
3214                 skbchap = alloc_skb(len, GFP_KERNEL);
3215                 if (!skbchap) {
3216                         printk(KERN_ERR "can not deliver chap: OOM\n");
3217                         err = -ENOMEM;
3218                         goto exit_get_chap;
3219                 }
3220
3221                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3222                                       (len - sizeof(*nlhchap)), 0);
3223                 evchap = nlmsg_data(nlhchap);
3224                 memset(evchap, 0, sizeof(*evchap));
3225                 evchap->transport_handle = iscsi_handle(transport);
3226                 evchap->type = nlh->nlmsg_type;
3227                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3228                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3229                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3230                 buf = (char *)evchap + sizeof(*evchap);
3231                 memset(buf, 0, chap_buf_size);
3232
3233                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3234                                     &evchap->u.get_chap.num_entries, buf);
3235
3236                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3237                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3238                 nlhchap->nlmsg_len = actual_size;
3239
3240                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3241                                           GFP_KERNEL);
3242         } while (err < 0 && err != -ECONNREFUSED);
3243
3244 exit_get_chap:
3245         scsi_host_put(shost);
3246         return err;
3247 }
3248
3249 static int iscsi_set_chap(struct iscsi_transport *transport,
3250                           struct iscsi_uevent *ev, uint32_t len)
3251 {
3252         char *data = (char *)ev + sizeof(*ev);
3253         struct Scsi_Host *shost;
3254         int err = 0;
3255
3256         if (!transport->set_chap)
3257                 return -ENOSYS;
3258
3259         shost = scsi_host_lookup(ev->u.set_path.host_no);
3260         if (!shost) {
3261                 pr_err("%s could not find host no %u\n",
3262                        __func__, ev->u.set_path.host_no);
3263                 return -ENODEV;
3264         }
3265
3266         err = transport->set_chap(shost, data, len);
3267         scsi_host_put(shost);
3268         return err;
3269 }
3270
3271 static int iscsi_delete_chap(struct iscsi_transport *transport,
3272                              struct iscsi_uevent *ev)
3273 {
3274         struct Scsi_Host *shost;
3275         int err = 0;
3276
3277         if (!transport->delete_chap)
3278                 return -ENOSYS;
3279
3280         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3281         if (!shost) {
3282                 printk(KERN_ERR "%s could not find host no %u\n",
3283                        __func__, ev->u.delete_chap.host_no);
3284                 return -ENODEV;
3285         }
3286
3287         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3288         scsi_host_put(shost);
3289         return err;
3290 }
3291
3292 static const struct {
3293         enum iscsi_discovery_parent_type value;
3294         char                            *name;
3295 } iscsi_discovery_parent_names[] = {
3296         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3297         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3298         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3299 };
3300
3301 char *iscsi_get_discovery_parent_name(int parent_type)
3302 {
3303         int i;
3304         char *state = "Unknown!";
3305
3306         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3307                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3308                         state = iscsi_discovery_parent_names[i].name;
3309                         break;
3310                 }
3311         }
3312         return state;
3313 }
3314 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3315
3316 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3317                                      struct iscsi_uevent *ev, uint32_t len)
3318 {
3319         char *data = (char *)ev + sizeof(*ev);
3320         struct Scsi_Host *shost;
3321         struct iscsi_bus_flash_session *fnode_sess;
3322         struct iscsi_bus_flash_conn *fnode_conn;
3323         struct device *dev;
3324         uint32_t idx;
3325         int err = 0;
3326
3327         if (!transport->set_flashnode_param) {
3328                 err = -ENOSYS;
3329                 goto exit_set_fnode;
3330         }
3331
3332         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3333         if (!shost) {
3334                 pr_err("%s could not find host no %u\n",
3335                        __func__, ev->u.set_flashnode.host_no);
3336                 err = -ENODEV;
3337                 goto exit_set_fnode;
3338         }
3339
3340         idx = ev->u.set_flashnode.flashnode_idx;
3341         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3342         if (!fnode_sess) {
3343                 pr_err("%s could not find flashnode %u for host no %u\n",
3344                        __func__, idx, ev->u.set_flashnode.host_no);
3345                 err = -ENODEV;
3346                 goto put_host;
3347         }
3348
3349         dev = iscsi_find_flashnode_conn(fnode_sess);
3350         if (!dev) {
3351                 err = -ENODEV;
3352                 goto put_sess;
3353         }
3354
3355         fnode_conn = iscsi_dev_to_flash_conn(dev);
3356         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3357         put_device(dev);
3358
3359 put_sess:
3360         put_device(&fnode_sess->dev);
3361
3362 put_host:
3363         scsi_host_put(shost);
3364
3365 exit_set_fnode:
3366         return err;
3367 }
3368
3369 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3370                                struct iscsi_uevent *ev, uint32_t len)
3371 {
3372         char *data = (char *)ev + sizeof(*ev);
3373         struct Scsi_Host *shost;
3374         int index;
3375         int err = 0;
3376
3377         if (!transport->new_flashnode) {
3378                 err = -ENOSYS;
3379                 goto exit_new_fnode;
3380         }
3381
3382         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3383         if (!shost) {
3384                 pr_err("%s could not find host no %u\n",
3385                        __func__, ev->u.new_flashnode.host_no);
3386                 err = -ENODEV;
3387                 goto put_host;
3388         }
3389
3390         index = transport->new_flashnode(shost, data, len);
3391
3392         if (index >= 0)
3393                 ev->r.new_flashnode_ret.flashnode_idx = index;
3394         else
3395                 err = -EIO;
3396
3397 put_host:
3398         scsi_host_put(shost);
3399
3400 exit_new_fnode:
3401         return err;
3402 }
3403
3404 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3405                                struct iscsi_uevent *ev)
3406 {
3407         struct Scsi_Host *shost;
3408         struct iscsi_bus_flash_session *fnode_sess;
3409         uint32_t idx;
3410         int err = 0;
3411
3412         if (!transport->del_flashnode) {
3413                 err = -ENOSYS;
3414                 goto exit_del_fnode;
3415         }
3416
3417         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3418         if (!shost) {
3419                 pr_err("%s could not find host no %u\n",
3420                        __func__, ev->u.del_flashnode.host_no);
3421                 err = -ENODEV;
3422                 goto put_host;
3423         }
3424
3425         idx = ev->u.del_flashnode.flashnode_idx;
3426         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3427         if (!fnode_sess) {
3428                 pr_err("%s could not find flashnode %u for host no %u\n",
3429                        __func__, idx, ev->u.del_flashnode.host_no);
3430                 err = -ENODEV;
3431                 goto put_host;
3432         }
3433
3434         err = transport->del_flashnode(fnode_sess);
3435         put_device(&fnode_sess->dev);
3436
3437 put_host:
3438         scsi_host_put(shost);
3439
3440 exit_del_fnode:
3441         return err;
3442 }
3443
3444 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3445                                  struct iscsi_uevent *ev)
3446 {
3447         struct Scsi_Host *shost;
3448         struct iscsi_bus_flash_session *fnode_sess;
3449         struct iscsi_bus_flash_conn *fnode_conn;
3450         struct device *dev;
3451         uint32_t idx;
3452         int err = 0;
3453
3454         if (!transport->login_flashnode) {
3455                 err = -ENOSYS;
3456                 goto exit_login_fnode;
3457         }
3458
3459         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3460         if (!shost) {
3461                 pr_err("%s could not find host no %u\n",
3462                        __func__, ev->u.login_flashnode.host_no);
3463                 err = -ENODEV;
3464                 goto put_host;
3465         }
3466
3467         idx = ev->u.login_flashnode.flashnode_idx;
3468         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3469         if (!fnode_sess) {
3470                 pr_err("%s could not find flashnode %u for host no %u\n",
3471                        __func__, idx, ev->u.login_flashnode.host_no);
3472                 err = -ENODEV;
3473                 goto put_host;
3474         }
3475
3476         dev = iscsi_find_flashnode_conn(fnode_sess);
3477         if (!dev) {
3478                 err = -ENODEV;
3479                 goto put_sess;
3480         }
3481
3482         fnode_conn = iscsi_dev_to_flash_conn(dev);
3483         err = transport->login_flashnode(fnode_sess, fnode_conn);
3484         put_device(dev);
3485
3486 put_sess:
3487         put_device(&fnode_sess->dev);
3488
3489 put_host:
3490         scsi_host_put(shost);
3491
3492 exit_login_fnode:
3493         return err;
3494 }
3495
3496 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3497                                   struct iscsi_uevent *ev)
3498 {
3499         struct Scsi_Host *shost;
3500         struct iscsi_bus_flash_session *fnode_sess;
3501         struct iscsi_bus_flash_conn *fnode_conn;
3502         struct device *dev;
3503         uint32_t idx;
3504         int err = 0;
3505
3506         if (!transport->logout_flashnode) {
3507                 err = -ENOSYS;
3508                 goto exit_logout_fnode;
3509         }
3510
3511         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3512         if (!shost) {
3513                 pr_err("%s could not find host no %u\n",
3514                        __func__, ev->u.logout_flashnode.host_no);
3515                 err = -ENODEV;
3516                 goto put_host;
3517         }
3518
3519         idx = ev->u.logout_flashnode.flashnode_idx;
3520         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3521         if (!fnode_sess) {
3522                 pr_err("%s could not find flashnode %u for host no %u\n",
3523                        __func__, idx, ev->u.logout_flashnode.host_no);
3524                 err = -ENODEV;
3525                 goto put_host;
3526         }
3527
3528         dev = iscsi_find_flashnode_conn(fnode_sess);
3529         if (!dev) {
3530                 err = -ENODEV;
3531                 goto put_sess;
3532         }
3533
3534         fnode_conn = iscsi_dev_to_flash_conn(dev);
3535
3536         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3537         put_device(dev);
3538
3539 put_sess:
3540         put_device(&fnode_sess->dev);
3541
3542 put_host:
3543         scsi_host_put(shost);
3544
3545 exit_logout_fnode:
3546         return err;
3547 }
3548
3549 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3550                                       struct iscsi_uevent *ev)
3551 {
3552         struct Scsi_Host *shost;
3553         struct iscsi_cls_session *session;
3554         int err = 0;
3555
3556         if (!transport->logout_flashnode_sid) {
3557                 err = -ENOSYS;
3558                 goto exit_logout_sid;
3559         }
3560
3561         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3562         if (!shost) {
3563                 pr_err("%s could not find host no %u\n",
3564                        __func__, ev->u.logout_flashnode.host_no);
3565                 err = -ENODEV;
3566                 goto put_host;
3567         }
3568
3569         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3570         if (!session) {
3571                 pr_err("%s could not find session id %u\n",
3572                        __func__, ev->u.logout_flashnode_sid.sid);
3573                 err = -EINVAL;
3574                 goto put_host;
3575         }
3576
3577         err = transport->logout_flashnode_sid(session);
3578
3579 put_host:
3580         scsi_host_put(shost);
3581
3582 exit_logout_sid:
3583         return err;
3584 }
3585
3586 static int
3587 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3588 {
3589         struct iscsi_uevent *ev = nlmsg_data(nlh);
3590         struct Scsi_Host *shost = NULL;
3591         struct iscsi_internal *priv;
3592         struct sk_buff *skbhost_stats;
3593         struct nlmsghdr *nlhhost_stats;
3594         struct iscsi_uevent *evhost_stats;
3595         int host_stats_size = 0;
3596         int len, err = 0;
3597         char *buf;
3598
3599         if (!transport->get_host_stats)
3600                 return -ENOSYS;
3601
3602         priv = iscsi_if_transport_lookup(transport);
3603         if (!priv)
3604                 return -EINVAL;
3605
3606         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3607         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3608
3609         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3610         if (!shost) {
3611                 pr_err("%s: failed. Could not find host no %u\n",
3612                        __func__, ev->u.get_host_stats.host_no);
3613                 return -ENODEV;
3614         }
3615
3616         do {
3617                 int actual_size;
3618
3619                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3620                 if (!skbhost_stats) {
3621                         pr_err("cannot deliver host stats: OOM\n");
3622                         err = -ENOMEM;
3623                         goto exit_host_stats;
3624                 }
3625
3626                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3627                                       (len - sizeof(*nlhhost_stats)), 0);
3628                 evhost_stats = nlmsg_data(nlhhost_stats);
3629                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3630                 evhost_stats->transport_handle = iscsi_handle(transport);
3631                 evhost_stats->type = nlh->nlmsg_type;
3632                 evhost_stats->u.get_host_stats.host_no =
3633                                         ev->u.get_host_stats.host_no;
3634                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3635                 memset(buf, 0, host_stats_size);
3636
3637                 err = transport->get_host_stats(shost, buf, host_stats_size);
3638                 if (err) {
3639                         kfree_skb(skbhost_stats);
3640                         goto exit_host_stats;
3641                 }
3642
3643                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3644                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3645                 nlhhost_stats->nlmsg_len = actual_size;
3646
3647                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3648                                           GFP_KERNEL);
3649         } while (err < 0 && err != -ECONNREFUSED);
3650
3651 exit_host_stats:
3652         scsi_host_put(shost);
3653         return err;
3654 }
3655
3656 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3657                                    struct nlmsghdr *nlh)
3658 {
3659         struct iscsi_uevent *ev = nlmsg_data(nlh);
3660         struct iscsi_cls_session *session;
3661         struct iscsi_cls_conn *conn = NULL;
3662         struct iscsi_endpoint *ep;
3663         uint32_t pdu_len;
3664         int err = 0;
3665
3666         switch (nlh->nlmsg_type) {
3667         case ISCSI_UEVENT_CREATE_CONN:
3668                 return iscsi_if_create_conn(transport, ev);
3669         case ISCSI_UEVENT_DESTROY_CONN:
3670                 return iscsi_if_destroy_conn(transport, ev);
3671         case ISCSI_UEVENT_STOP_CONN:
3672                 return iscsi_if_stop_conn(transport, ev);
3673         }
3674
3675         /*
3676          * The following cmds need to be run under the ep_mutex so in kernel
3677          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3678          * these are running. They also must not run if we have just run a conn
3679          * cleanup because they would set the state in a way that might allow
3680          * IO or send IO themselves.
3681          */
3682         switch (nlh->nlmsg_type) {
3683         case ISCSI_UEVENT_START_CONN:
3684                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3685                                          ev->u.start_conn.cid);
3686                 break;
3687         case ISCSI_UEVENT_BIND_CONN:
3688                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3689                 break;
3690         case ISCSI_UEVENT_SEND_PDU:
3691                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3692                 break;
3693         }
3694
3695         if (!conn)
3696                 return -EINVAL;
3697
3698         mutex_lock(&conn->ep_mutex);
3699         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3700                 mutex_unlock(&conn->ep_mutex);
3701                 ev->r.retcode = -ENOTCONN;
3702                 return 0;
3703         }
3704
3705         switch (nlh->nlmsg_type) {
3706         case ISCSI_UEVENT_BIND_CONN:
3707                 if (conn->ep) {
3708                         /*
3709                          * For offload boot support where iscsid is restarted
3710                          * during the pivot root stage, the ep will be intact
3711                          * here when the new iscsid instance starts up and
3712                          * reconnects.
3713                          */
3714                         iscsi_ep_disconnect(conn, true);
3715                 }
3716
3717                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3718                 if (!session) {
3719                         err = -EINVAL;
3720                         break;
3721                 }
3722
3723                 ev->r.retcode = transport->bind_conn(session, conn,
3724                                                 ev->u.b_conn.transport_eph,
3725                                                 ev->u.b_conn.is_leading);
3726                 if (!ev->r.retcode)
3727                         conn->state = ISCSI_CONN_BOUND;
3728
3729                 if (ev->r.retcode || !transport->ep_connect)
3730                         break;
3731
3732                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3733                 if (ep) {
3734                         ep->conn = conn;
3735                         conn->ep = ep;
3736                         iscsi_put_endpoint(ep);
3737                 } else {
3738                         err = -ENOTCONN;
3739                         iscsi_cls_conn_printk(KERN_ERR, conn,
3740                                               "Could not set ep conn binding\n");
3741                 }
3742                 break;
3743         case ISCSI_UEVENT_START_CONN:
3744                 ev->r.retcode = transport->start_conn(conn);
3745                 if (!ev->r.retcode)
3746                         conn->state = ISCSI_CONN_UP;
3747                 break;
3748         case ISCSI_UEVENT_SEND_PDU:
3749                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3750
3751                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3752                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3753                         err = -EINVAL;
3754                         break;
3755                 }
3756
3757                 ev->r.retcode = transport->send_pdu(conn,
3758                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3759                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3760                                 ev->u.send_pdu.data_size);
3761                 break;
3762         default:
3763                 err = -ENOSYS;
3764         }
3765
3766         mutex_unlock(&conn->ep_mutex);
3767         return err;
3768 }
3769
3770 static int
3771 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3772 {
3773         int err = 0;
3774         u32 portid;
3775         struct iscsi_uevent *ev = nlmsg_data(nlh);
3776         struct iscsi_transport *transport = NULL;
3777         struct iscsi_internal *priv;
3778         struct iscsi_cls_session *session;
3779         struct iscsi_endpoint *ep = NULL;
3780
3781         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3782                 return -EPERM;
3783
3784         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3785                 *group = ISCSI_NL_GRP_UIP;
3786         else
3787                 *group = ISCSI_NL_GRP_ISCSID;
3788
3789         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3790         if (!priv)
3791                 return -EINVAL;
3792         transport = priv->iscsi_transport;
3793
3794         if (!try_module_get(transport->owner))
3795                 return -EINVAL;
3796
3797         portid = NETLINK_CB(skb).portid;
3798
3799         switch (nlh->nlmsg_type) {
3800         case ISCSI_UEVENT_CREATE_SESSION:
3801                 err = iscsi_if_create_session(priv, ep, ev,
3802                                               portid,
3803                                               ev->u.c_session.initial_cmdsn,
3804                                               ev->u.c_session.cmds_max,
3805                                               ev->u.c_session.queue_depth);
3806                 break;
3807         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3808                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3809                 if (!ep) {
3810                         err = -EINVAL;
3811                         break;
3812                 }
3813
3814                 err = iscsi_if_create_session(priv, ep, ev,
3815                                         portid,
3816                                         ev->u.c_bound_session.initial_cmdsn,
3817                                         ev->u.c_bound_session.cmds_max,
3818                                         ev->u.c_bound_session.queue_depth);
3819                 iscsi_put_endpoint(ep);
3820                 break;
3821         case ISCSI_UEVENT_DESTROY_SESSION:
3822                 session = iscsi_session_lookup(ev->u.d_session.sid);
3823                 if (!session)
3824                         err = -EINVAL;
3825                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3826                         err = -EBUSY;
3827                 else
3828                         transport->destroy_session(session);
3829                 break;
3830         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3831                 session = iscsi_session_lookup(ev->u.d_session.sid);
3832                 if (!session)
3833                         err = -EINVAL;
3834                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3835                         err = -EBUSY;
3836                 else {
3837                         unsigned long flags;
3838
3839                         /* Prevent this session from being found again */
3840                         spin_lock_irqsave(&sesslock, flags);
3841                         list_del_init(&session->sess_list);
3842                         spin_unlock_irqrestore(&sesslock, flags);
3843
3844                         queue_work(system_unbound_wq, &session->destroy_work);
3845                 }
3846                 break;
3847         case ISCSI_UEVENT_UNBIND_SESSION:
3848                 session = iscsi_session_lookup(ev->u.d_session.sid);
3849                 if (session)
3850                         queue_work(session->workq, &session->unbind_work);
3851                 else
3852                         err = -EINVAL;
3853                 break;
3854         case ISCSI_UEVENT_SET_PARAM:
3855                 err = iscsi_set_param(transport, ev);
3856                 break;
3857         case ISCSI_UEVENT_CREATE_CONN:
3858         case ISCSI_UEVENT_DESTROY_CONN:
3859         case ISCSI_UEVENT_STOP_CONN:
3860         case ISCSI_UEVENT_START_CONN:
3861         case ISCSI_UEVENT_BIND_CONN:
3862         case ISCSI_UEVENT_SEND_PDU:
3863                 err = iscsi_if_transport_conn(transport, nlh);
3864                 break;
3865         case ISCSI_UEVENT_GET_STATS:
3866                 err = iscsi_if_get_stats(transport, nlh);
3867                 break;
3868         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3869         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3870         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3871         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3872                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3873                 break;
3874         case ISCSI_UEVENT_TGT_DSCVR:
3875                 err = iscsi_tgt_dscvr(transport, ev);
3876                 break;
3877         case ISCSI_UEVENT_SET_HOST_PARAM:
3878                 err = iscsi_set_host_param(transport, ev);
3879                 break;
3880         case ISCSI_UEVENT_PATH_UPDATE:
3881                 err = iscsi_set_path(transport, ev);
3882                 break;
3883         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3884                 err = iscsi_set_iface_params(transport, ev,
3885                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3886                 break;
3887         case ISCSI_UEVENT_PING:
3888                 err = iscsi_send_ping(transport, ev);
3889                 break;
3890         case ISCSI_UEVENT_GET_CHAP:
3891                 err = iscsi_get_chap(transport, nlh);
3892                 break;
3893         case ISCSI_UEVENT_DELETE_CHAP:
3894                 err = iscsi_delete_chap(transport, ev);
3895                 break;
3896         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3897                 err = iscsi_set_flashnode_param(transport, ev,
3898                                                 nlmsg_attrlen(nlh,
3899                                                               sizeof(*ev)));
3900                 break;
3901         case ISCSI_UEVENT_NEW_FLASHNODE:
3902                 err = iscsi_new_flashnode(transport, ev,
3903                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3904                 break;
3905         case ISCSI_UEVENT_DEL_FLASHNODE:
3906                 err = iscsi_del_flashnode(transport, ev);
3907                 break;
3908         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3909                 err = iscsi_login_flashnode(transport, ev);
3910                 break;
3911         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3912                 err = iscsi_logout_flashnode(transport, ev);
3913                 break;
3914         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3915                 err = iscsi_logout_flashnode_sid(transport, ev);
3916                 break;
3917         case ISCSI_UEVENT_SET_CHAP:
3918                 err = iscsi_set_chap(transport, ev,
3919                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3920                 break;
3921         case ISCSI_UEVENT_GET_HOST_STATS:
3922                 err = iscsi_get_host_stats(transport, nlh);
3923                 break;
3924         default:
3925                 err = -ENOSYS;
3926                 break;
3927         }
3928
3929         module_put(transport->owner);
3930         return err;
3931 }
3932
3933 /*
3934  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3935  * Malformed skbs with wrong lengths or invalid creds are not processed.
3936  */
3937 static void
3938 iscsi_if_rx(struct sk_buff *skb)
3939 {
3940         u32 portid = NETLINK_CB(skb).portid;
3941
3942         mutex_lock(&rx_queue_mutex);
3943         while (skb->len >= NLMSG_HDRLEN) {
3944                 int err;
3945                 uint32_t rlen;
3946                 struct nlmsghdr *nlh;
3947                 struct iscsi_uevent *ev;
3948                 uint32_t group;
3949                 int retries = ISCSI_SEND_MAX_ALLOWED;
3950
3951                 nlh = nlmsg_hdr(skb);
3952                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3953                     skb->len < nlh->nlmsg_len) {
3954                         break;
3955                 }
3956
3957                 ev = nlmsg_data(nlh);
3958                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3959                 if (rlen > skb->len)
3960                         rlen = skb->len;
3961
3962                 err = iscsi_if_recv_msg(skb, nlh, &group);
3963                 if (err) {
3964                         ev->type = ISCSI_KEVENT_IF_ERROR;
3965                         ev->iferror = err;
3966                 }
3967                 do {
3968                         /*
3969                          * special case for GET_STATS:
3970                          * on success - sending reply and stats from
3971                          * inside of if_recv_msg(),
3972                          * on error - fall through.
3973                          */
3974                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3975                                 break;
3976                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3977                                 break;
3978                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3979                                                   ev, sizeof(*ev));
3980                         if (err == -EAGAIN && --retries < 0) {
3981                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3982                                 break;
3983                         }
3984                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3985                 skb_pull(skb, rlen);
3986         }
3987         mutex_unlock(&rx_queue_mutex);
3988 }
3989
3990 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3991 struct device_attribute dev_attr_##_prefix##_##_name =  \
3992         __ATTR(_name,_mode,_show,_store)
3993
3994 /*
3995  * iSCSI connection attrs
3996  */
3997 #define iscsi_conn_attr_show(param)                                     \
3998 static ssize_t                                                          \
3999 show_conn_param_##param(struct device *dev,                             \
4000                         struct device_attribute *attr, char *buf)       \
4001 {                                                                       \
4002         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4003         struct iscsi_transport *t = conn->transport;                    \
4004         return t->get_conn_param(conn, param, buf);                     \
4005 }
4006
4007 #define iscsi_conn_attr(field, param)                                   \
4008         iscsi_conn_attr_show(param)                                     \
4009 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4010                         NULL);
4011
4012 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4013 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4014 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4015 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4016 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4017 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4018 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4019 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4020 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4021 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4022 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4023 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4024 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4025 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4026 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4027 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4028 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4029 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4030 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4031 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4032 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4033 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4034 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4035 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4036 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4037 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4038 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4039 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4040
4041 static const char *const connection_state_names[] = {
4042         [ISCSI_CONN_UP] = "up",
4043         [ISCSI_CONN_DOWN] = "down",
4044         [ISCSI_CONN_FAILED] = "failed",
4045         [ISCSI_CONN_BOUND] = "bound"
4046 };
4047
4048 static ssize_t show_conn_state(struct device *dev,
4049                                struct device_attribute *attr, char *buf)
4050 {
4051         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4052         const char *state = "unknown";
4053
4054         if (conn->state >= 0 &&
4055             conn->state < ARRAY_SIZE(connection_state_names))
4056                 state = connection_state_names[conn->state];
4057
4058         return sysfs_emit(buf, "%s\n", state);
4059 }
4060 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4061                         NULL);
4062
4063 #define iscsi_conn_ep_attr_show(param)                                  \
4064 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4065                                           struct device_attribute *attr,\
4066                                           char *buf)                    \
4067 {                                                                       \
4068         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4069         struct iscsi_transport *t = conn->transport;                    \
4070         struct iscsi_endpoint *ep;                                      \
4071         ssize_t rc;                                                     \
4072                                                                         \
4073         /*                                                              \
4074          * Need to make sure ep_disconnect does not free the LLD's      \
4075          * interconnect resources while we are trying to read them.     \
4076          */                                                             \
4077         mutex_lock(&conn->ep_mutex);                                    \
4078         ep = conn->ep;                                                  \
4079         if (!ep && t->ep_connect) {                                     \
4080                 mutex_unlock(&conn->ep_mutex);                          \
4081                 return -ENOTCONN;                                       \
4082         }                                                               \
4083                                                                         \
4084         if (ep)                                                         \
4085                 rc = t->get_ep_param(ep, param, buf);                   \
4086         else                                                            \
4087                 rc = t->get_conn_param(conn, param, buf);               \
4088         mutex_unlock(&conn->ep_mutex);                                  \
4089         return rc;                                                      \
4090 }
4091
4092 #define iscsi_conn_ep_attr(field, param)                                \
4093         iscsi_conn_ep_attr_show(param)                                  \
4094 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4095                         show_conn_ep_param_##param, NULL);
4096
4097 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4098 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4099
4100 static struct attribute *iscsi_conn_attrs[] = {
4101         &dev_attr_conn_max_recv_dlength.attr,
4102         &dev_attr_conn_max_xmit_dlength.attr,
4103         &dev_attr_conn_header_digest.attr,
4104         &dev_attr_conn_data_digest.attr,
4105         &dev_attr_conn_ifmarker.attr,
4106         &dev_attr_conn_ofmarker.attr,
4107         &dev_attr_conn_address.attr,
4108         &dev_attr_conn_port.attr,
4109         &dev_attr_conn_exp_statsn.attr,
4110         &dev_attr_conn_persistent_address.attr,
4111         &dev_attr_conn_persistent_port.attr,
4112         &dev_attr_conn_ping_tmo.attr,
4113         &dev_attr_conn_recv_tmo.attr,
4114         &dev_attr_conn_local_port.attr,
4115         &dev_attr_conn_statsn.attr,
4116         &dev_attr_conn_keepalive_tmo.attr,
4117         &dev_attr_conn_max_segment_size.attr,
4118         &dev_attr_conn_tcp_timestamp_stat.attr,
4119         &dev_attr_conn_tcp_wsf_disable.attr,
4120         &dev_attr_conn_tcp_nagle_disable.attr,
4121         &dev_attr_conn_tcp_timer_scale.attr,
4122         &dev_attr_conn_tcp_timestamp_enable.attr,
4123         &dev_attr_conn_fragment_disable.attr,
4124         &dev_attr_conn_ipv4_tos.attr,
4125         &dev_attr_conn_ipv6_traffic_class.attr,
4126         &dev_attr_conn_ipv6_flow_label.attr,
4127         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4128         &dev_attr_conn_tcp_xmit_wsf.attr,
4129         &dev_attr_conn_tcp_recv_wsf.attr,
4130         &dev_attr_conn_local_ipaddr.attr,
4131         &dev_attr_conn_state.attr,
4132         NULL,
4133 };
4134
4135 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4136                                          struct attribute *attr, int i)
4137 {
4138         struct device *cdev = container_of(kobj, struct device, kobj);
4139         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4140         struct iscsi_transport *t = conn->transport;
4141         int param;
4142
4143         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4144                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4145         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4146                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4147         else if (attr == &dev_attr_conn_header_digest.attr)
4148                 param = ISCSI_PARAM_HDRDGST_EN;
4149         else if (attr == &dev_attr_conn_data_digest.attr)
4150                 param = ISCSI_PARAM_DATADGST_EN;
4151         else if (attr == &dev_attr_conn_ifmarker.attr)
4152                 param = ISCSI_PARAM_IFMARKER_EN;
4153         else if (attr == &dev_attr_conn_ofmarker.attr)
4154                 param = ISCSI_PARAM_OFMARKER_EN;
4155         else if (attr == &dev_attr_conn_address.attr)
4156                 param = ISCSI_PARAM_CONN_ADDRESS;
4157         else if (attr == &dev_attr_conn_port.attr)
4158                 param = ISCSI_PARAM_CONN_PORT;
4159         else if (attr == &dev_attr_conn_exp_statsn.attr)
4160                 param = ISCSI_PARAM_EXP_STATSN;
4161         else if (attr == &dev_attr_conn_persistent_address.attr)
4162                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4163         else if (attr == &dev_attr_conn_persistent_port.attr)
4164                 param = ISCSI_PARAM_PERSISTENT_PORT;
4165         else if (attr == &dev_attr_conn_ping_tmo.attr)
4166                 param = ISCSI_PARAM_PING_TMO;
4167         else if (attr == &dev_attr_conn_recv_tmo.attr)
4168                 param = ISCSI_PARAM_RECV_TMO;
4169         else if (attr == &dev_attr_conn_local_port.attr)
4170                 param = ISCSI_PARAM_LOCAL_PORT;
4171         else if (attr == &dev_attr_conn_statsn.attr)
4172                 param = ISCSI_PARAM_STATSN;
4173         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4174                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4175         else if (attr == &dev_attr_conn_max_segment_size.attr)
4176                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4177         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4178                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4179         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4180                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4181         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4182                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4183         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4184                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4185         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4186                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4187         else if (attr == &dev_attr_conn_fragment_disable.attr)
4188                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4189         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4190                 param = ISCSI_PARAM_IPV4_TOS;
4191         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4192                 param = ISCSI_PARAM_IPV6_TC;
4193         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4194                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4195         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4196                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4197         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4198                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4199         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4200                 param = ISCSI_PARAM_TCP_RECV_WSF;
4201         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4202                 param = ISCSI_PARAM_LOCAL_IPADDR;
4203         else if (attr == &dev_attr_conn_state.attr)
4204                 return S_IRUGO;
4205         else {
4206                 WARN_ONCE(1, "Invalid conn attr");
4207                 return 0;
4208         }
4209
4210         return t->attr_is_visible(ISCSI_PARAM, param);
4211 }
4212
4213 static struct attribute_group iscsi_conn_group = {
4214         .attrs = iscsi_conn_attrs,
4215         .is_visible = iscsi_conn_attr_is_visible,
4216 };
4217
4218 /*
4219  * iSCSI session attrs
4220  */
4221 #define iscsi_session_attr_show(param, perm)                            \
4222 static ssize_t                                                          \
4223 show_session_param_##param(struct device *dev,                          \
4224                            struct device_attribute *attr, char *buf)    \
4225 {                                                                       \
4226         struct iscsi_cls_session *session =                             \
4227                 iscsi_dev_to_session(dev->parent);                      \
4228         struct iscsi_transport *t = session->transport;                 \
4229                                                                         \
4230         if (perm && !capable(CAP_SYS_ADMIN))                            \
4231                 return -EACCES;                                         \
4232         return t->get_session_param(session, param, buf);               \
4233 }
4234
4235 #define iscsi_session_attr(field, param, perm)                          \
4236         iscsi_session_attr_show(param, perm)                            \
4237 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4238                         NULL);
4239 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4240 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4241 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4242 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4243 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4244 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4245 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4246 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4247 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4248 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4249 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4250 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4251 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4252 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4253 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4254 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4255 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4256 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4257 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4258 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4259 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4260 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4261 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4262 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4263 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4264 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4265 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4266 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4267 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4268 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4269 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4270 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4271 iscsi_session_attr(discovery_auth_optional,
4272                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4273 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4274 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4275 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4276 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4277 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4278 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4279 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4280
4281 static ssize_t
4282 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4283                         char *buf)
4284 {
4285         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4286         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4287 }
4288 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4289                         NULL);
4290 static ssize_t
4291 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4292                         char *buf)
4293 {
4294         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4295         return sysfs_emit(buf, "%d\n", session->creator);
4296 }
4297 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4298                         NULL);
4299 static ssize_t
4300 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4301                             char *buf)
4302 {
4303         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4304         return sysfs_emit(buf, "%d\n", session->target_id);
4305 }
4306 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4307                         show_priv_session_target_id, NULL);
4308
4309 #define iscsi_priv_session_attr_show(field, format)                     \
4310 static ssize_t                                                          \
4311 show_priv_session_##field(struct device *dev,                           \
4312                           struct device_attribute *attr, char *buf)     \
4313 {                                                                       \
4314         struct iscsi_cls_session *session =                             \
4315                         iscsi_dev_to_session(dev->parent);              \
4316         if (session->field == -1)                                       \
4317                 return sysfs_emit(buf, "off\n");                        \
4318         return sysfs_emit(buf, format"\n", session->field);             \
4319 }
4320
4321 #define iscsi_priv_session_attr_store(field)                            \
4322 static ssize_t                                                          \
4323 store_priv_session_##field(struct device *dev,                          \
4324                            struct device_attribute *attr,               \
4325                            const char *buf, size_t count)               \
4326 {                                                                       \
4327         int val;                                                        \
4328         char *cp;                                                       \
4329         struct iscsi_cls_session *session =                             \
4330                 iscsi_dev_to_session(dev->parent);                      \
4331         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4332             (session->state == ISCSI_SESSION_FAILED))                   \
4333                 return -EBUSY;                                          \
4334         if (strncmp(buf, "off", 3) == 0) {                              \
4335                 session->field = -1;                                    \
4336                 session->field##_sysfs_override = true;                 \
4337         } else {                                                        \
4338                 val = simple_strtoul(buf, &cp, 0);                      \
4339                 if (*cp != '\0' && *cp != '\n')                         \
4340                         return -EINVAL;                                 \
4341                 session->field = val;                                   \
4342                 session->field##_sysfs_override = true;                 \
4343         }                                                               \
4344         return count;                                                   \
4345 }
4346
4347 #define iscsi_priv_session_rw_attr(field, format)                       \
4348         iscsi_priv_session_attr_show(field, format)                     \
4349         iscsi_priv_session_attr_store(field)                            \
4350 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4351                         show_priv_session_##field,                      \
4352                         store_priv_session_##field)
4353
4354 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4355
4356 static struct attribute *iscsi_session_attrs[] = {
4357         &dev_attr_sess_initial_r2t.attr,
4358         &dev_attr_sess_max_outstanding_r2t.attr,
4359         &dev_attr_sess_immediate_data.attr,
4360         &dev_attr_sess_first_burst_len.attr,
4361         &dev_attr_sess_max_burst_len.attr,
4362         &dev_attr_sess_data_pdu_in_order.attr,
4363         &dev_attr_sess_data_seq_in_order.attr,
4364         &dev_attr_sess_erl.attr,
4365         &dev_attr_sess_targetname.attr,
4366         &dev_attr_sess_tpgt.attr,
4367         &dev_attr_sess_password.attr,
4368         &dev_attr_sess_password_in.attr,
4369         &dev_attr_sess_username.attr,
4370         &dev_attr_sess_username_in.attr,
4371         &dev_attr_sess_fast_abort.attr,
4372         &dev_attr_sess_abort_tmo.attr,
4373         &dev_attr_sess_lu_reset_tmo.attr,
4374         &dev_attr_sess_tgt_reset_tmo.attr,
4375         &dev_attr_sess_ifacename.attr,
4376         &dev_attr_sess_initiatorname.attr,
4377         &dev_attr_sess_targetalias.attr,
4378         &dev_attr_sess_boot_root.attr,
4379         &dev_attr_sess_boot_nic.attr,
4380         &dev_attr_sess_boot_target.attr,
4381         &dev_attr_priv_sess_recovery_tmo.attr,
4382         &dev_attr_priv_sess_state.attr,
4383         &dev_attr_priv_sess_creator.attr,
4384         &dev_attr_sess_chap_out_idx.attr,
4385         &dev_attr_sess_chap_in_idx.attr,
4386         &dev_attr_priv_sess_target_id.attr,
4387         &dev_attr_sess_auto_snd_tgt_disable.attr,
4388         &dev_attr_sess_discovery_session.attr,
4389         &dev_attr_sess_portal_type.attr,
4390         &dev_attr_sess_chap_auth.attr,
4391         &dev_attr_sess_discovery_logout.attr,
4392         &dev_attr_sess_bidi_chap.attr,
4393         &dev_attr_sess_discovery_auth_optional.attr,
4394         &dev_attr_sess_def_time2wait.attr,
4395         &dev_attr_sess_def_time2retain.attr,
4396         &dev_attr_sess_isid.attr,
4397         &dev_attr_sess_tsid.attr,
4398         &dev_attr_sess_def_taskmgmt_tmo.attr,
4399         &dev_attr_sess_discovery_parent_idx.attr,
4400         &dev_attr_sess_discovery_parent_type.attr,
4401         NULL,
4402 };
4403
4404 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4405                                             struct attribute *attr, int i)
4406 {
4407         struct device *cdev = container_of(kobj, struct device, kobj);
4408         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4409         struct iscsi_transport *t = session->transport;
4410         int param;
4411
4412         if (attr == &dev_attr_sess_initial_r2t.attr)
4413                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4414         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4415                 param = ISCSI_PARAM_MAX_R2T;
4416         else if (attr == &dev_attr_sess_immediate_data.attr)
4417                 param = ISCSI_PARAM_IMM_DATA_EN;
4418         else if (attr == &dev_attr_sess_first_burst_len.attr)
4419                 param = ISCSI_PARAM_FIRST_BURST;
4420         else if (attr == &dev_attr_sess_max_burst_len.attr)
4421                 param = ISCSI_PARAM_MAX_BURST;
4422         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4423                 param = ISCSI_PARAM_PDU_INORDER_EN;
4424         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4425                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4426         else if (attr == &dev_attr_sess_erl.attr)
4427                 param = ISCSI_PARAM_ERL;
4428         else if (attr == &dev_attr_sess_targetname.attr)
4429                 param = ISCSI_PARAM_TARGET_NAME;
4430         else if (attr == &dev_attr_sess_tpgt.attr)
4431                 param = ISCSI_PARAM_TPGT;
4432         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4433                 param = ISCSI_PARAM_CHAP_IN_IDX;
4434         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4435                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4436         else if (attr == &dev_attr_sess_password.attr)
4437                 param = ISCSI_PARAM_USERNAME;
4438         else if (attr == &dev_attr_sess_password_in.attr)
4439                 param = ISCSI_PARAM_USERNAME_IN;
4440         else if (attr == &dev_attr_sess_username.attr)
4441                 param = ISCSI_PARAM_PASSWORD;
4442         else if (attr == &dev_attr_sess_username_in.attr)
4443                 param = ISCSI_PARAM_PASSWORD_IN;
4444         else if (attr == &dev_attr_sess_fast_abort.attr)
4445                 param = ISCSI_PARAM_FAST_ABORT;
4446         else if (attr == &dev_attr_sess_abort_tmo.attr)
4447                 param = ISCSI_PARAM_ABORT_TMO;
4448         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4449                 param = ISCSI_PARAM_LU_RESET_TMO;
4450         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4451                 param = ISCSI_PARAM_TGT_RESET_TMO;
4452         else if (attr == &dev_attr_sess_ifacename.attr)
4453                 param = ISCSI_PARAM_IFACE_NAME;
4454         else if (attr == &dev_attr_sess_initiatorname.attr)
4455                 param = ISCSI_PARAM_INITIATOR_NAME;
4456         else if (attr == &dev_attr_sess_targetalias.attr)
4457                 param = ISCSI_PARAM_TARGET_ALIAS;
4458         else if (attr == &dev_attr_sess_boot_root.attr)
4459                 param = ISCSI_PARAM_BOOT_ROOT;
4460         else if (attr == &dev_attr_sess_boot_nic.attr)
4461                 param = ISCSI_PARAM_BOOT_NIC;
4462         else if (attr == &dev_attr_sess_boot_target.attr)
4463                 param = ISCSI_PARAM_BOOT_TARGET;
4464         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4465                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4466         else if (attr == &dev_attr_sess_discovery_session.attr)
4467                 param = ISCSI_PARAM_DISCOVERY_SESS;
4468         else if (attr == &dev_attr_sess_portal_type.attr)
4469                 param = ISCSI_PARAM_PORTAL_TYPE;
4470         else if (attr == &dev_attr_sess_chap_auth.attr)
4471                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4472         else if (attr == &dev_attr_sess_discovery_logout.attr)
4473                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4474         else if (attr == &dev_attr_sess_bidi_chap.attr)
4475                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4476         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4477                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4478         else if (attr == &dev_attr_sess_def_time2wait.attr)
4479                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4480         else if (attr == &dev_attr_sess_def_time2retain.attr)
4481                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4482         else if (attr == &dev_attr_sess_isid.attr)
4483                 param = ISCSI_PARAM_ISID;
4484         else if (attr == &dev_attr_sess_tsid.attr)
4485                 param = ISCSI_PARAM_TSID;
4486         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4487                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4488         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4489                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4490         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4491                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4492         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4493                 return S_IRUGO | S_IWUSR;
4494         else if (attr == &dev_attr_priv_sess_state.attr)
4495                 return S_IRUGO;
4496         else if (attr == &dev_attr_priv_sess_creator.attr)
4497                 return S_IRUGO;
4498         else if (attr == &dev_attr_priv_sess_target_id.attr)
4499                 return S_IRUGO;
4500         else {
4501                 WARN_ONCE(1, "Invalid session attr");
4502                 return 0;
4503         }
4504
4505         return t->attr_is_visible(ISCSI_PARAM, param);
4506 }
4507
4508 static struct attribute_group iscsi_session_group = {
4509         .attrs = iscsi_session_attrs,
4510         .is_visible = iscsi_session_attr_is_visible,
4511 };
4512
4513 /*
4514  * iSCSI host attrs
4515  */
4516 #define iscsi_host_attr_show(param)                                     \
4517 static ssize_t                                                          \
4518 show_host_param_##param(struct device *dev,                             \
4519                         struct device_attribute *attr, char *buf)       \
4520 {                                                                       \
4521         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4522         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4523         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4524 }
4525
4526 #define iscsi_host_attr(field, param)                                   \
4527         iscsi_host_attr_show(param)                                     \
4528 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4529                         NULL);
4530
4531 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4532 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4533 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4534 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4535 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4536 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4537
4538 static struct attribute *iscsi_host_attrs[] = {
4539         &dev_attr_host_netdev.attr,
4540         &dev_attr_host_hwaddress.attr,
4541         &dev_attr_host_ipaddress.attr,
4542         &dev_attr_host_initiatorname.attr,
4543         &dev_attr_host_port_state.attr,
4544         &dev_attr_host_port_speed.attr,
4545         NULL,
4546 };
4547
4548 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4549                                          struct attribute *attr, int i)
4550 {
4551         struct device *cdev = container_of(kobj, struct device, kobj);
4552         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4553         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4554         int param;
4555
4556         if (attr == &dev_attr_host_netdev.attr)
4557                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4558         else if (attr == &dev_attr_host_hwaddress.attr)
4559                 param = ISCSI_HOST_PARAM_HWADDRESS;
4560         else if (attr == &dev_attr_host_ipaddress.attr)
4561                 param = ISCSI_HOST_PARAM_IPADDRESS;
4562         else if (attr == &dev_attr_host_initiatorname.attr)
4563                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4564         else if (attr == &dev_attr_host_port_state.attr)
4565                 param = ISCSI_HOST_PARAM_PORT_STATE;
4566         else if (attr == &dev_attr_host_port_speed.attr)
4567                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4568         else {
4569                 WARN_ONCE(1, "Invalid host attr");
4570                 return 0;
4571         }
4572
4573         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4574 }
4575
4576 static struct attribute_group iscsi_host_group = {
4577         .attrs = iscsi_host_attrs,
4578         .is_visible = iscsi_host_attr_is_visible,
4579 };
4580
4581 /* convert iscsi_port_speed values to ascii string name */
4582 static const struct {
4583         enum iscsi_port_speed   value;
4584         char                    *name;
4585 } iscsi_port_speed_names[] = {
4586         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4587         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4588         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4589         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4590         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4591         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4592         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4593 };
4594
4595 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4596 {
4597         int i;
4598         char *speed = "Unknown!";
4599         struct iscsi_cls_host *ihost = shost->shost_data;
4600         uint32_t port_speed = ihost->port_speed;
4601
4602         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4603                 if (iscsi_port_speed_names[i].value & port_speed) {
4604                         speed = iscsi_port_speed_names[i].name;
4605                         break;
4606                 }
4607         }
4608         return speed;
4609 }
4610 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4611
4612 /* convert iscsi_port_state values to ascii string name */
4613 static const struct {
4614         enum iscsi_port_state   value;
4615         char                    *name;
4616 } iscsi_port_state_names[] = {
4617         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4618         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4619 };
4620
4621 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4622 {
4623         int i;
4624         char *state = "Unknown!";
4625         struct iscsi_cls_host *ihost = shost->shost_data;
4626         uint32_t port_state = ihost->port_state;
4627
4628         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4629                 if (iscsi_port_state_names[i].value & port_state) {
4630                         state = iscsi_port_state_names[i].name;
4631                         break;
4632                 }
4633         }
4634         return state;
4635 }
4636 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4637
4638 static int iscsi_session_match(struct attribute_container *cont,
4639                            struct device *dev)
4640 {
4641         struct iscsi_cls_session *session;
4642         struct Scsi_Host *shost;
4643         struct iscsi_internal *priv;
4644
4645         if (!iscsi_is_session_dev(dev))
4646                 return 0;
4647
4648         session = iscsi_dev_to_session(dev);
4649         shost = iscsi_session_to_shost(session);
4650         if (!shost->transportt)
4651                 return 0;
4652
4653         priv = to_iscsi_internal(shost->transportt);
4654         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4655                 return 0;
4656
4657         return &priv->session_cont.ac == cont;
4658 }
4659
4660 static int iscsi_conn_match(struct attribute_container *cont,
4661                            struct device *dev)
4662 {
4663         struct iscsi_cls_session *session;
4664         struct iscsi_cls_conn *conn;
4665         struct Scsi_Host *shost;
4666         struct iscsi_internal *priv;
4667
4668         if (!iscsi_is_conn_dev(dev))
4669                 return 0;
4670
4671         conn = iscsi_dev_to_conn(dev);
4672         session = iscsi_dev_to_session(conn->dev.parent);
4673         shost = iscsi_session_to_shost(session);
4674
4675         if (!shost->transportt)
4676                 return 0;
4677
4678         priv = to_iscsi_internal(shost->transportt);
4679         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4680                 return 0;
4681
4682         return &priv->conn_cont.ac == cont;
4683 }
4684
4685 static int iscsi_host_match(struct attribute_container *cont,
4686                             struct device *dev)
4687 {
4688         struct Scsi_Host *shost;
4689         struct iscsi_internal *priv;
4690
4691         if (!scsi_is_host_device(dev))
4692                 return 0;
4693
4694         shost = dev_to_shost(dev);
4695         if (!shost->transportt  ||
4696             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4697                 return 0;
4698
4699         priv = to_iscsi_internal(shost->transportt);
4700         return &priv->t.host_attrs.ac == cont;
4701 }
4702
4703 struct scsi_transport_template *
4704 iscsi_register_transport(struct iscsi_transport *tt)
4705 {
4706         struct iscsi_internal *priv;
4707         unsigned long flags;
4708         int err;
4709
4710         BUG_ON(!tt);
4711         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4712
4713         priv = iscsi_if_transport_lookup(tt);
4714         if (priv)
4715                 return NULL;
4716
4717         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4718         if (!priv)
4719                 return NULL;
4720         INIT_LIST_HEAD(&priv->list);
4721         priv->iscsi_transport = tt;
4722         priv->t.user_scan = iscsi_user_scan;
4723
4724         priv->dev.class = &iscsi_transport_class;
4725         dev_set_name(&priv->dev, "%s", tt->name);
4726         err = device_register(&priv->dev);
4727         if (err)
4728                 goto free_priv;
4729
4730         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4731         if (err)
4732                 goto unregister_dev;
4733
4734         /* host parameters */
4735         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4736         priv->t.host_attrs.ac.match = iscsi_host_match;
4737         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4738         priv->t.host_size = sizeof(struct iscsi_cls_host);
4739         transport_container_register(&priv->t.host_attrs);
4740
4741         /* connection parameters */
4742         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4743         priv->conn_cont.ac.match = iscsi_conn_match;
4744         priv->conn_cont.ac.grp = &iscsi_conn_group;
4745         transport_container_register(&priv->conn_cont);
4746
4747         /* session parameters */
4748         priv->session_cont.ac.class = &iscsi_session_class.class;
4749         priv->session_cont.ac.match = iscsi_session_match;
4750         priv->session_cont.ac.grp = &iscsi_session_group;
4751         transport_container_register(&priv->session_cont);
4752
4753         spin_lock_irqsave(&iscsi_transport_lock, flags);
4754         list_add(&priv->list, &iscsi_transports);
4755         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4756
4757         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4758         return &priv->t;
4759
4760 unregister_dev:
4761         device_unregister(&priv->dev);
4762         return NULL;
4763 free_priv:
4764         kfree(priv);
4765         return NULL;
4766 }
4767 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4768
4769 int iscsi_unregister_transport(struct iscsi_transport *tt)
4770 {
4771         struct iscsi_internal *priv;
4772         unsigned long flags;
4773
4774         BUG_ON(!tt);
4775
4776         mutex_lock(&rx_queue_mutex);
4777
4778         priv = iscsi_if_transport_lookup(tt);
4779         BUG_ON (!priv);
4780
4781         spin_lock_irqsave(&iscsi_transport_lock, flags);
4782         list_del(&priv->list);
4783         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4784
4785         transport_container_unregister(&priv->conn_cont);
4786         transport_container_unregister(&priv->session_cont);
4787         transport_container_unregister(&priv->t.host_attrs);
4788
4789         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4790         device_unregister(&priv->dev);
4791         mutex_unlock(&rx_queue_mutex);
4792
4793         return 0;
4794 }
4795 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4796
4797 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4798                      struct device *dev, const char *fmt, ...)
4799 {
4800         struct va_format vaf;
4801         va_list args;
4802
4803         va_start(args, fmt);
4804         vaf.fmt = fmt;
4805         vaf.va = &args;
4806         trace(dev, &vaf);
4807         va_end(args);
4808 }
4809 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4810
4811 static __init int iscsi_transport_init(void)
4812 {
4813         int err;
4814         struct netlink_kernel_cfg cfg = {
4815                 .groups = 1,
4816                 .input  = iscsi_if_rx,
4817         };
4818         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4819                 ISCSI_TRANSPORT_VERSION);
4820
4821         atomic_set(&iscsi_session_nr, 0);
4822
4823         err = class_register(&iscsi_transport_class);
4824         if (err)
4825                 return err;
4826
4827         err = class_register(&iscsi_endpoint_class);
4828         if (err)
4829                 goto unregister_transport_class;
4830
4831         err = class_register(&iscsi_iface_class);
4832         if (err)
4833                 goto unregister_endpoint_class;
4834
4835         err = transport_class_register(&iscsi_host_class);
4836         if (err)
4837                 goto unregister_iface_class;
4838
4839         err = transport_class_register(&iscsi_connection_class);
4840         if (err)
4841                 goto unregister_host_class;
4842
4843         err = transport_class_register(&iscsi_session_class);
4844         if (err)
4845                 goto unregister_conn_class;
4846
4847         err = bus_register(&iscsi_flashnode_bus);
4848         if (err)
4849                 goto unregister_session_class;
4850
4851         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4852         if (!nls) {
4853                 err = -ENOBUFS;
4854                 goto unregister_flashnode_bus;
4855         }
4856
4857         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4858                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4859                         "iscsi_conn_cleanup");
4860         if (!iscsi_conn_cleanup_workq) {
4861                 err = -ENOMEM;
4862                 goto release_nls;
4863         }
4864
4865         return 0;
4866
4867 release_nls:
4868         netlink_kernel_release(nls);
4869 unregister_flashnode_bus:
4870         bus_unregister(&iscsi_flashnode_bus);
4871 unregister_session_class:
4872         transport_class_unregister(&iscsi_session_class);
4873 unregister_conn_class:
4874         transport_class_unregister(&iscsi_connection_class);
4875 unregister_host_class:
4876         transport_class_unregister(&iscsi_host_class);
4877 unregister_iface_class:
4878         class_unregister(&iscsi_iface_class);
4879 unregister_endpoint_class:
4880         class_unregister(&iscsi_endpoint_class);
4881 unregister_transport_class:
4882         class_unregister(&iscsi_transport_class);
4883         return err;
4884 }
4885
4886 static void __exit iscsi_transport_exit(void)
4887 {
4888         destroy_workqueue(iscsi_conn_cleanup_workq);
4889         netlink_kernel_release(nls);
4890         bus_unregister(&iscsi_flashnode_bus);
4891         transport_class_unregister(&iscsi_connection_class);
4892         transport_class_unregister(&iscsi_session_class);
4893         transport_class_unregister(&iscsi_host_class);
4894         class_unregister(&iscsi_endpoint_class);
4895         class_unregister(&iscsi_iface_class);
4896         class_unregister(&iscsi_transport_class);
4897 }
4898
4899 module_init(iscsi_transport_init);
4900 module_exit(iscsi_transport_exit);
4901
4902 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4903               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4904               "Alex Aizman <itn780@yahoo.com>");
4905 MODULE_DESCRIPTION("iSCSI Transport Interface");
4906 MODULE_LICENSE("GPL");
4907 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4908 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);