drivers/scsi/scsi_transport_iscsi.c

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