drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90 static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  93
  94 static DEFINE_IDA(iscsi_sess_ida);
  95 /*
  96  * list of registered transports and lock that must
  97  * be held while accessing list. The iscsi_transport_lock must
  98  * be acquired after the rx_queue_mutex.
  99  */
 100 static LIST_HEAD(iscsi_transports);
 101 static DEFINE_SPINLOCK(iscsi_transport_lock);
 102
 103 #define to_iscsi_internal(tmpl) \
 104         container_of(tmpl, struct iscsi_internal, t)
 105
 106 #define dev_to_iscsi_internal(_dev) \
 107         container_of(_dev, struct iscsi_internal, dev)
 108
 109 static void iscsi_transport_release(struct device *dev)
 110 {
 111         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 112         kfree(priv);
 113 }
 114
 115 /*
 116  * iscsi_transport_class represents the iscsi_transports that are
 117  * registered.
 118  */
 119 static struct class iscsi_transport_class = {
 120         .name = "iscsi_transport",
 121         .dev_release = iscsi_transport_release,
 122 };
 123
 124 static ssize_t
 125 show_transport_handle(struct device *dev, struct device_attribute *attr,
 126                       char *buf)
 127 {
 128         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 129
 130         if (!capable(CAP_SYS_ADMIN))
 131                 return -EACCES;
 132         return sysfs_emit(buf, "%llu\n",
 133                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 134 }
 135 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 136
 137 #define show_transport_attr(name, format)                               \
 138 static ssize_t                                                          \
 139 show_transport_##name(struct device *dev,                               \
 140                       struct device_attribute *attr,char *buf)          \
 141 {                                                                       \
 142         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 143         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 144 }                                                                       \
 145 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 146
 147 show_transport_attr(caps, "0x%x");
 148
 149 static struct attribute *iscsi_transport_attrs[] = {
 150         &dev_attr_handle.attr,
 151         &dev_attr_caps.attr,
 152         NULL,
 153 };
 154
 155 static struct attribute_group iscsi_transport_group = {
 156         .attrs = iscsi_transport_attrs,
 157 };
 158
 159 /*
 160  * iSCSI endpoint attrs
 161  */
 162 #define iscsi_dev_to_endpoint(_dev) \
 163         container_of(_dev, struct iscsi_endpoint, dev)
 164
 165 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 166 struct device_attribute dev_attr_##_prefix##_##_name =  \
 167         __ATTR(_name,_mode,_show,_store)
 168
 169 static void iscsi_endpoint_release(struct device *dev)
 170 {
 171         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 172         kfree(ep);
 173 }
 174
 175 static struct class iscsi_endpoint_class = {
 176         .name = "iscsi_endpoint",
 177         .dev_release = iscsi_endpoint_release,
 178 };
 179
 180 static ssize_t
 181 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 182 {
 183         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 184         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 185 }
 186 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 187
 188 static struct attribute *iscsi_endpoint_attrs[] = {
 189         &dev_attr_ep_handle.attr,
 190         NULL,
 191 };
 192
 193 static struct attribute_group iscsi_endpoint_group = {
 194         .attrs = iscsi_endpoint_attrs,
 195 };
 196
 197 #define ISCSI_MAX_EPID -1
 198
 199 static int iscsi_match_epid(struct device *dev, const void *data)
 200 {
 201         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 202         const uint64_t *epid = data;
 203
 204         return *epid == ep->id;
 205 }
 206
 207 struct iscsi_endpoint *
 208 iscsi_create_endpoint(int dd_size)
 209 {
 210         struct device *dev;
 211         struct iscsi_endpoint *ep;
 212         uint64_t id;
 213         int err;
 214
 215         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 216                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 217                                         iscsi_match_epid);
 218                 if (!dev)
 219                         break;
 220                 else
 221                         put_device(dev);
 222         }
 223         if (id == ISCSI_MAX_EPID) {
 224                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 225                        ISCSI_MAX_EPID - 1);
 226                 return NULL;
 227         }
 228
 229         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 230         if (!ep)
 231                 return NULL;
 232
 233         ep->id = id;
 234         ep->dev.class = &iscsi_endpoint_class;
 235         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 236         err = device_register(&ep->dev);
 237         if (err)
 238                 goto free_ep;
 239
 240         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 241         if (err)
 242                 goto unregister_dev;
 243
 244         if (dd_size)
 245                 ep->dd_data = &ep[1];
 246         return ep;
 247
 248 unregister_dev:
 249         device_unregister(&ep->dev);
 250         return NULL;
 251
 252 free_ep:
 253         kfree(ep);
 254         return NULL;
 255 }
 256 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 257
 258 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 259 {
 260         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 261         device_unregister(&ep->dev);
 262 }
 263 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 264
 265 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 266 {
 267         put_device(&ep->dev);
 268 }
 269 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 270
 271 /**
 272  * iscsi_lookup_endpoint - get ep from handle
 273  * @handle: endpoint handle
 274  *
 275  * Caller must do a iscsi_put_endpoint.
 276  */
 277 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 278 {
 279         struct device *dev;
 280
 281         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 282                                 iscsi_match_epid);
 283         if (!dev)
 284                 return NULL;
 285
 286         return iscsi_dev_to_endpoint(dev);
 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 LIST_HEAD(connlist_err);
1626 static DEFINE_SPINLOCK(connlock);
1627
1628 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1629 {
1630         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1631         return sess->sid;
1632 }
1633
1634 /*
1635  * Returns the matching session to a given sid
1636  */
1637 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1638 {
1639         unsigned long flags;
1640         struct iscsi_cls_session *sess;
1641
1642         spin_lock_irqsave(&sesslock, flags);
1643         list_for_each_entry(sess, &sesslist, sess_list) {
1644                 if (sess->sid == sid) {
1645                         spin_unlock_irqrestore(&sesslock, flags);
1646                         return sess;
1647                 }
1648         }
1649         spin_unlock_irqrestore(&sesslock, flags);
1650         return NULL;
1651 }
1652
1653 /*
1654  * Returns the matching connection to a given sid / cid tuple
1655  */
1656 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1657 {
1658         unsigned long flags;
1659         struct iscsi_cls_conn *conn;
1660
1661         spin_lock_irqsave(&connlock, flags);
1662         list_for_each_entry(conn, &connlist, conn_list) {
1663                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1664                         spin_unlock_irqrestore(&connlock, flags);
1665                         return conn;
1666                 }
1667         }
1668         spin_unlock_irqrestore(&connlock, flags);
1669         return NULL;
1670 }
1671
1672 /*
1673  * The following functions can be used by LLDs that allocate
1674  * their own scsi_hosts or by software iscsi LLDs
1675  */
1676 static struct {
1677         int value;
1678         char *name;
1679 } iscsi_session_state_names[] = {
1680         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1681         { ISCSI_SESSION_FAILED,         "FAILED" },
1682         { ISCSI_SESSION_FREE,           "FREE" },
1683 };
1684
1685 static const char *iscsi_session_state_name(int state)
1686 {
1687         int i;
1688         char *name = NULL;
1689
1690         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1691                 if (iscsi_session_state_names[i].value == state) {
1692                         name = iscsi_session_state_names[i].name;
1693                         break;
1694                 }
1695         }
1696         return name;
1697 }
1698
1699 int iscsi_session_chkready(struct iscsi_cls_session *session)
1700 {
1701         int err;
1702
1703         switch (session->state) {
1704         case ISCSI_SESSION_LOGGED_IN:
1705                 err = 0;
1706                 break;
1707         case ISCSI_SESSION_FAILED:
1708                 err = DID_IMM_RETRY << 16;
1709                 break;
1710         case ISCSI_SESSION_FREE:
1711                 err = DID_TRANSPORT_FAILFAST << 16;
1712                 break;
1713         default:
1714                 err = DID_NO_CONNECT << 16;
1715                 break;
1716         }
1717         return err;
1718 }
1719 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1720
1721 int iscsi_is_session_online(struct iscsi_cls_session *session)
1722 {
1723         unsigned long flags;
1724         int ret = 0;
1725
1726         spin_lock_irqsave(&session->lock, flags);
1727         if (session->state == ISCSI_SESSION_LOGGED_IN)
1728                 ret = 1;
1729         spin_unlock_irqrestore(&session->lock, flags);
1730         return ret;
1731 }
1732 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1733
1734 static void iscsi_session_release(struct device *dev)
1735 {
1736         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1737         struct Scsi_Host *shost;
1738
1739         shost = iscsi_session_to_shost(session);
1740         scsi_host_put(shost);
1741         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1742         kfree(session);
1743 }
1744
1745 int iscsi_is_session_dev(const struct device *dev)
1746 {
1747         return dev->release == iscsi_session_release;
1748 }
1749 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1750
1751 static int iscsi_iter_session_fn(struct device *dev, void *data)
1752 {
1753         void (* fn) (struct iscsi_cls_session *) = data;
1754
1755         if (!iscsi_is_session_dev(dev))
1756                 return 0;
1757         fn(iscsi_dev_to_session(dev));
1758         return 0;
1759 }
1760
1761 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1762                                  void (*fn)(struct iscsi_cls_session *))
1763 {
1764         device_for_each_child(&shost->shost_gendev, fn,
1765                               iscsi_iter_session_fn);
1766 }
1767 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1768
1769 /**
1770  * iscsi_scan_finished - helper to report when running scans are done
1771  * @shost: scsi host
1772  * @time: scan run time
1773  *
1774  * This function can be used by drives like qla4xxx to report to the scsi
1775  * layer when the scans it kicked off at module load time are done.
1776  */
1777 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1778 {
1779         struct iscsi_cls_host *ihost = shost->shost_data;
1780         /*
1781          * qla4xxx will have kicked off some session unblocks before calling
1782          * scsi_scan_host, so just wait for them to complete.
1783          */
1784         return !atomic_read(&ihost->nr_scans);
1785 }
1786 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1787
1788 struct iscsi_scan_data {
1789         unsigned int channel;
1790         unsigned int id;
1791         u64 lun;
1792         enum scsi_scan_mode rescan;
1793 };
1794
1795 static int iscsi_user_scan_session(struct device *dev, void *data)
1796 {
1797         struct iscsi_scan_data *scan_data = data;
1798         struct iscsi_cls_session *session;
1799         struct Scsi_Host *shost;
1800         struct iscsi_cls_host *ihost;
1801         unsigned long flags;
1802         unsigned int id;
1803
1804         if (!iscsi_is_session_dev(dev))
1805                 return 0;
1806
1807         session = iscsi_dev_to_session(dev);
1808
1809         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1810
1811         shost = iscsi_session_to_shost(session);
1812         ihost = shost->shost_data;
1813
1814         mutex_lock(&ihost->mutex);
1815         spin_lock_irqsave(&session->lock, flags);
1816         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1817                 spin_unlock_irqrestore(&session->lock, flags);
1818                 goto user_scan_exit;
1819         }
1820         id = session->target_id;
1821         spin_unlock_irqrestore(&session->lock, flags);
1822
1823         if (id != ISCSI_MAX_TARGET) {
1824                 if ((scan_data->channel == SCAN_WILD_CARD ||
1825                      scan_data->channel == 0) &&
1826                     (scan_data->id == SCAN_WILD_CARD ||
1827                      scan_data->id == id))
1828                         scsi_scan_target(&session->dev, 0, id,
1829                                          scan_data->lun, scan_data->rescan);
1830         }
1831
1832 user_scan_exit:
1833         mutex_unlock(&ihost->mutex);
1834         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1835         return 0;
1836 }
1837
1838 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1839                            uint id, u64 lun)
1840 {
1841         struct iscsi_scan_data scan_data;
1842
1843         scan_data.channel = channel;
1844         scan_data.id = id;
1845         scan_data.lun = lun;
1846         scan_data.rescan = SCSI_SCAN_MANUAL;
1847
1848         return device_for_each_child(&shost->shost_gendev, &scan_data,
1849                                      iscsi_user_scan_session);
1850 }
1851
1852 static void iscsi_scan_session(struct work_struct *work)
1853 {
1854         struct iscsi_cls_session *session =
1855                         container_of(work, struct iscsi_cls_session, scan_work);
1856         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1857         struct iscsi_cls_host *ihost = shost->shost_data;
1858         struct iscsi_scan_data scan_data;
1859
1860         scan_data.channel = 0;
1861         scan_data.id = SCAN_WILD_CARD;
1862         scan_data.lun = SCAN_WILD_CARD;
1863         scan_data.rescan = SCSI_SCAN_RESCAN;
1864
1865         iscsi_user_scan_session(&session->dev, &scan_data);
1866         atomic_dec(&ihost->nr_scans);
1867 }
1868
1869 /**
1870  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1871  * @cmd: scsi cmd passed to scsi eh handler
1872  *
1873  * If the session is down this function will wait for the recovery
1874  * timer to fire or for the session to be logged back in. If the
1875  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1876  * should pass this error value to the scsi eh.
1877  */
1878 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1879 {
1880         struct iscsi_cls_session *session =
1881                         starget_to_session(scsi_target(cmd->device));
1882         unsigned long flags;
1883         int ret = 0;
1884
1885         spin_lock_irqsave(&session->lock, flags);
1886         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1887                 if (session->state == ISCSI_SESSION_FREE) {
1888                         ret = FAST_IO_FAIL;
1889                         break;
1890                 }
1891                 spin_unlock_irqrestore(&session->lock, flags);
1892                 msleep(1000);
1893                 spin_lock_irqsave(&session->lock, flags);
1894         }
1895         spin_unlock_irqrestore(&session->lock, flags);
1896         return ret;
1897 }
1898 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1899
1900 static void session_recovery_timedout(struct work_struct *work)
1901 {
1902         struct iscsi_cls_session *session =
1903                 container_of(work, struct iscsi_cls_session,
1904                              recovery_work.work);
1905         unsigned long flags;
1906
1907         iscsi_cls_session_printk(KERN_INFO, session,
1908                                  "session recovery timed out after %d secs\n",
1909                                  session->recovery_tmo);
1910
1911         spin_lock_irqsave(&session->lock, flags);
1912         switch (session->state) {
1913         case ISCSI_SESSION_FAILED:
1914                 session->state = ISCSI_SESSION_FREE;
1915                 break;
1916         case ISCSI_SESSION_LOGGED_IN:
1917         case ISCSI_SESSION_FREE:
1918                 /* we raced with the unblock's flush */
1919                 spin_unlock_irqrestore(&session->lock, flags);
1920                 return;
1921         }
1922         spin_unlock_irqrestore(&session->lock, flags);
1923
1924         if (session->transport->session_recovery_timedout)
1925                 session->transport->session_recovery_timedout(session);
1926
1927         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1928         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1929         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1930 }
1931
1932 static void __iscsi_unblock_session(struct work_struct *work)
1933 {
1934         struct iscsi_cls_session *session =
1935                         container_of(work, struct iscsi_cls_session,
1936                                      unblock_work);
1937         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1938         struct iscsi_cls_host *ihost = shost->shost_data;
1939         unsigned long flags;
1940
1941         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1942         /*
1943          * The recovery and unblock work get run from the same workqueue,
1944          * so try to cancel it if it was going to run after this unblock.
1945          */
1946         cancel_delayed_work(&session->recovery_work);
1947         spin_lock_irqsave(&session->lock, flags);
1948         session->state = ISCSI_SESSION_LOGGED_IN;
1949         spin_unlock_irqrestore(&session->lock, flags);
1950         /* start IO */
1951         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1952         /*
1953          * Only do kernel scanning if the driver is properly hooked into
1954          * the async scanning code (drivers like iscsi_tcp do login and
1955          * scanning from userspace).
1956          */
1957         if (shost->hostt->scan_finished) {
1958                 if (scsi_queue_work(shost, &session->scan_work))
1959                         atomic_inc(&ihost->nr_scans);
1960         }
1961         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1962 }
1963
1964 /**
1965  * iscsi_unblock_session - set a session as logged in and start IO.
1966  * @session: iscsi session
1967  *
1968  * Mark a session as ready to accept IO.
1969  */
1970 void iscsi_unblock_session(struct iscsi_cls_session *session)
1971 {
1972         flush_work(&session->block_work);
1973
1974         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1975         /*
1976          * Blocking the session can be done from any context so we only
1977          * queue the block work. Make sure the unblock work has completed
1978          * because it flushes/cancels the other works and updates the state.
1979          */
1980         flush_work(&session->unblock_work);
1981 }
1982 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1983
1984 static void __iscsi_block_session(struct work_struct *work)
1985 {
1986         struct iscsi_cls_session *session =
1987                         container_of(work, struct iscsi_cls_session,
1988                                      block_work);
1989         unsigned long flags;
1990
1991         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1992         spin_lock_irqsave(&session->lock, flags);
1993         session->state = ISCSI_SESSION_FAILED;
1994         spin_unlock_irqrestore(&session->lock, flags);
1995         scsi_target_block(&session->dev);
1996         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1997         if (session->recovery_tmo >= 0)
1998                 queue_delayed_work(iscsi_eh_timer_workq,
1999                                    &session->recovery_work,
2000                                    session->recovery_tmo * HZ);
2001 }
2002
2003 void iscsi_block_session(struct iscsi_cls_session *session)
2004 {
2005         queue_work(iscsi_eh_timer_workq, &session->block_work);
2006 }
2007 EXPORT_SYMBOL_GPL(iscsi_block_session);
2008
2009 static void __iscsi_unbind_session(struct work_struct *work)
2010 {
2011         struct iscsi_cls_session *session =
2012                         container_of(work, struct iscsi_cls_session,
2013                                      unbind_work);
2014         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2015         struct iscsi_cls_host *ihost = shost->shost_data;
2016         unsigned long flags;
2017         unsigned int target_id;
2018
2019         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2020
2021         /* Prevent new scans and make sure scanning is not in progress */
2022         mutex_lock(&ihost->mutex);
2023         spin_lock_irqsave(&session->lock, flags);
2024         if (session->target_id == ISCSI_MAX_TARGET) {
2025                 spin_unlock_irqrestore(&session->lock, flags);
2026                 mutex_unlock(&ihost->mutex);
2027                 goto unbind_session_exit;
2028         }
2029
2030         target_id = session->target_id;
2031         session->target_id = ISCSI_MAX_TARGET;
2032         spin_unlock_irqrestore(&session->lock, flags);
2033         mutex_unlock(&ihost->mutex);
2034
2035         scsi_remove_target(&session->dev);
2036
2037         if (session->ida_used)
2038                 ida_simple_remove(&iscsi_sess_ida, target_id);
2039
2040 unbind_session_exit:
2041         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2042         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2043 }
2044
2045 static void __iscsi_destroy_session(struct work_struct *work)
2046 {
2047         struct iscsi_cls_session *session =
2048                 container_of(work, struct iscsi_cls_session, destroy_work);
2049
2050         session->transport->destroy_session(session);
2051 }
2052
2053 struct iscsi_cls_session *
2054 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2055                     int dd_size)
2056 {
2057         struct iscsi_cls_session *session;
2058
2059         session = kzalloc(sizeof(*session) + dd_size,
2060                           GFP_KERNEL);
2061         if (!session)
2062                 return NULL;
2063
2064         session->transport = transport;
2065         session->creator = -1;
2066         session->recovery_tmo = 120;
2067         session->recovery_tmo_sysfs_override = false;
2068         session->state = ISCSI_SESSION_FREE;
2069         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2070         INIT_LIST_HEAD(&session->sess_list);
2071         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2072         INIT_WORK(&session->block_work, __iscsi_block_session);
2073         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2074         INIT_WORK(&session->scan_work, iscsi_scan_session);
2075         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2076         spin_lock_init(&session->lock);
2077
2078         /* this is released in the dev's release function */
2079         scsi_host_get(shost);
2080         session->dev.parent = &shost->shost_gendev;
2081         session->dev.release = iscsi_session_release;
2082         device_initialize(&session->dev);
2083         if (dd_size)
2084                 session->dd_data = &session[1];
2085
2086         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2087         return session;
2088 }
2089 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2090
2091 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2092 {
2093         unsigned long flags;
2094         int id = 0;
2095         int err;
2096
2097         session->sid = atomic_add_return(1, &iscsi_session_nr);
2098
2099         if (target_id == ISCSI_MAX_TARGET) {
2100                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2101
2102                 if (id < 0) {
2103                         iscsi_cls_session_printk(KERN_ERR, session,
2104                                         "Failure in Target ID Allocation\n");
2105                         return id;
2106                 }
2107                 session->target_id = (unsigned int)id;
2108                 session->ida_used = true;
2109         } else
2110                 session->target_id = target_id;
2111
2112         dev_set_name(&session->dev, "session%u", session->sid);
2113         err = device_add(&session->dev);
2114         if (err) {
2115                 iscsi_cls_session_printk(KERN_ERR, session,
2116                                          "could not register session's dev\n");
2117                 goto release_ida;
2118         }
2119         err = transport_register_device(&session->dev);
2120         if (err) {
2121                 iscsi_cls_session_printk(KERN_ERR, session,
2122                                          "could not register transport's dev\n");
2123                 goto release_dev;
2124         }
2125
2126         spin_lock_irqsave(&sesslock, flags);
2127         list_add(&session->sess_list, &sesslist);
2128         spin_unlock_irqrestore(&sesslock, flags);
2129
2130         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2131         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2132         return 0;
2133
2134 release_dev:
2135         device_del(&session->dev);
2136 release_ida:
2137         if (session->ida_used)
2138                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2139
2140         return err;
2141 }
2142 EXPORT_SYMBOL_GPL(iscsi_add_session);
2143
2144 /**
2145  * iscsi_create_session - create iscsi class session
2146  * @shost: scsi host
2147  * @transport: iscsi transport
2148  * @dd_size: private driver data size
2149  * @target_id: which target
2150  *
2151  * This can be called from a LLD or iscsi_transport.
2152  */
2153 struct iscsi_cls_session *
2154 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2155                      int dd_size, unsigned int target_id)
2156 {
2157         struct iscsi_cls_session *session;
2158
2159         session = iscsi_alloc_session(shost, transport, dd_size);
2160         if (!session)
2161                 return NULL;
2162
2163         if (iscsi_add_session(session, target_id)) {
2164                 iscsi_free_session(session);
2165                 return NULL;
2166         }
2167         return session;
2168 }
2169 EXPORT_SYMBOL_GPL(iscsi_create_session);
2170
2171 static void iscsi_conn_release(struct device *dev)
2172 {
2173         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2174         struct device *parent = conn->dev.parent;
2175
2176         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2177         kfree(conn);
2178         put_device(parent);
2179 }
2180
2181 static int iscsi_is_conn_dev(const struct device *dev)
2182 {
2183         return dev->release == iscsi_conn_release;
2184 }
2185
2186 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2187 {
2188         if (!iscsi_is_conn_dev(dev))
2189                 return 0;
2190         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2191 }
2192
2193 void iscsi_remove_session(struct iscsi_cls_session *session)
2194 {
2195         unsigned long flags;
2196         int err;
2197
2198         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2199
2200         spin_lock_irqsave(&sesslock, flags);
2201         if (!list_empty(&session->sess_list))
2202                 list_del(&session->sess_list);
2203         spin_unlock_irqrestore(&sesslock, flags);
2204
2205         flush_work(&session->block_work);
2206         flush_work(&session->unblock_work);
2207         cancel_delayed_work_sync(&session->recovery_work);
2208         /*
2209          * If we are blocked let commands flow again. The lld or iscsi
2210          * layer should set up the queuecommand to fail commands.
2211          * We assume that LLD will not be calling block/unblock while
2212          * removing the session.
2213          */
2214         spin_lock_irqsave(&session->lock, flags);
2215         session->state = ISCSI_SESSION_FREE;
2216         spin_unlock_irqrestore(&session->lock, flags);
2217
2218         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2219         /* flush running scans then delete devices */
2220         flush_work(&session->scan_work);
2221         /* flush running unbind operations */
2222         flush_work(&session->unbind_work);
2223         __iscsi_unbind_session(&session->unbind_work);
2224
2225         /* hw iscsi may not have removed all connections from session */
2226         err = device_for_each_child(&session->dev, NULL,
2227                                     iscsi_iter_destroy_conn_fn);
2228         if (err)
2229                 iscsi_cls_session_printk(KERN_ERR, session,
2230                                          "Could not delete all connections "
2231                                          "for session. Error %d.\n", err);
2232
2233         transport_unregister_device(&session->dev);
2234
2235         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2236         device_del(&session->dev);
2237 }
2238 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2239
2240 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2241 {
2242         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2243
2244         switch (flag) {
2245         case STOP_CONN_RECOVER:
2246                 conn->state = ISCSI_CONN_FAILED;
2247                 break;
2248         case STOP_CONN_TERM:
2249                 conn->state = ISCSI_CONN_DOWN;
2250                 break;
2251         default:
2252                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2253                                       flag);
2254                 return;
2255         }
2256
2257         conn->transport->stop_conn(conn, flag);
2258         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2259 }
2260
2261 static int iscsi_if_stop_conn(struct iscsi_transport *transport,
2262                               struct iscsi_uevent *ev)
2263 {
2264         int flag = ev->u.stop_conn.flag;
2265         struct iscsi_cls_conn *conn;
2266
2267         conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2268         if (!conn)
2269                 return -EINVAL;
2270
2271         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2272         /*
2273          * If this is a termination we have to call stop_conn with that flag
2274          * so the correct states get set. If we haven't run the work yet try to
2275          * avoid the extra run.
2276          */
2277         if (flag == STOP_CONN_TERM) {
2278                 cancel_work_sync(&conn->cleanup_work);
2279                 iscsi_stop_conn(conn, flag);
2280         } else {
2281                 /*
2282                  * Figure out if it was the kernel or userspace initiating this.
2283                  */
2284                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2285                         iscsi_stop_conn(conn, flag);
2286                 } else {
2287                         ISCSI_DBG_TRANS_CONN(conn,
2288                                              "flush kernel conn cleanup.\n");
2289                         flush_work(&conn->cleanup_work);
2290                 }
2291                 /*
2292                  * Only clear for recovery to avoid extra cleanup runs during
2293                  * termination.
2294                  */
2295                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2296         }
2297         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2298         return 0;
2299 }
2300
2301 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2302 {
2303         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2304         struct iscsi_endpoint *ep;
2305
2306         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2307         conn->state = ISCSI_CONN_FAILED;
2308
2309         if (!conn->ep || !session->transport->ep_disconnect)
2310                 return;
2311
2312         ep = conn->ep;
2313         conn->ep = NULL;
2314
2315         session->transport->unbind_conn(conn, is_active);
2316         session->transport->ep_disconnect(ep);
2317         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2318 }
2319
2320 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2321 {
2322         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2323                                                    cleanup_work);
2324         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2325
2326         mutex_lock(&conn->ep_mutex);
2327         /*
2328          * If we are not at least bound there is nothing for us to do. Userspace
2329          * will do a ep_disconnect call if offload is used, but will not be
2330          * doing a stop since there is nothing to clean up, so we have to clear
2331          * the cleanup bit here.
2332          */
2333         if (conn->state != ISCSI_CONN_BOUND && conn->state != ISCSI_CONN_UP) {
2334                 ISCSI_DBG_TRANS_CONN(conn, "Got error while conn is already failed. Ignoring.\n");
2335                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2336                 mutex_unlock(&conn->ep_mutex);
2337                 return;
2338         }
2339
2340         iscsi_ep_disconnect(conn, false);
2341
2342         if (system_state != SYSTEM_RUNNING) {
2343                 /*
2344                  * If the user has set up for the session to never timeout
2345                  * then hang like they wanted. For all other cases fail right
2346                  * away since userspace is not going to relogin.
2347                  */
2348                 if (session->recovery_tmo > 0)
2349                         session->recovery_tmo = 0;
2350         }
2351
2352         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2353         mutex_unlock(&conn->ep_mutex);
2354         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2355 }
2356
2357 void iscsi_free_session(struct iscsi_cls_session *session)
2358 {
2359         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2360         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2361         put_device(&session->dev);
2362 }
2363 EXPORT_SYMBOL_GPL(iscsi_free_session);
2364
2365 /**
2366  * iscsi_create_conn - create iscsi class connection
2367  * @session: iscsi cls session
2368  * @dd_size: private driver data size
2369  * @cid: connection id
2370  *
2371  * This can be called from a LLD or iscsi_transport. The connection
2372  * is child of the session so cid must be unique for all connections
2373  * on the session.
2374  *
2375  * Since we do not support MCS, cid will normally be zero. In some cases
2376  * for software iscsi we could be trying to preallocate a connection struct
2377  * in which case there could be two connection structs and cid would be
2378  * non-zero.
2379  */
2380 struct iscsi_cls_conn *
2381 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2382 {
2383         struct iscsi_transport *transport = session->transport;
2384         struct iscsi_cls_conn *conn;
2385         unsigned long flags;
2386         int err;
2387
2388         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2389         if (!conn)
2390                 return NULL;
2391         if (dd_size)
2392                 conn->dd_data = &conn[1];
2393
2394         mutex_init(&conn->ep_mutex);
2395         INIT_LIST_HEAD(&conn->conn_list);
2396         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2397         conn->transport = transport;
2398         conn->cid = cid;
2399         conn->state = ISCSI_CONN_DOWN;
2400
2401         /* this is released in the dev's release function */
2402         if (!get_device(&session->dev))
2403                 goto free_conn;
2404
2405         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2406         conn->dev.parent = &session->dev;
2407         conn->dev.release = iscsi_conn_release;
2408         err = device_register(&conn->dev);
2409         if (err) {
2410                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2411                                          "register connection's dev\n");
2412                 goto release_parent_ref;
2413         }
2414         err = transport_register_device(&conn->dev);
2415         if (err) {
2416                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2417                                          "register transport's dev\n");
2418                 goto release_conn_ref;
2419         }
2420
2421         spin_lock_irqsave(&connlock, flags);
2422         list_add(&conn->conn_list, &connlist);
2423         spin_unlock_irqrestore(&connlock, flags);
2424
2425         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2426         return conn;
2427
2428 release_conn_ref:
2429         device_unregister(&conn->dev);
2430         put_device(&session->dev);
2431         return NULL;
2432 release_parent_ref:
2433         put_device(&session->dev);
2434 free_conn:
2435         kfree(conn);
2436         return NULL;
2437 }
2438
2439 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2440
2441 /**
2442  * iscsi_destroy_conn - destroy iscsi class connection
2443  * @conn: iscsi cls session
2444  *
2445  * This can be called from a LLD or iscsi_transport.
2446  */
2447 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2448 {
2449         unsigned long flags;
2450
2451         spin_lock_irqsave(&connlock, flags);
2452         list_del(&conn->conn_list);
2453         spin_unlock_irqrestore(&connlock, flags);
2454
2455         transport_unregister_device(&conn->dev);
2456         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2457         device_unregister(&conn->dev);
2458         return 0;
2459 }
2460 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2461
2462 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2463 {
2464         put_device(&conn->dev);
2465 }
2466 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2467
2468 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2469 {
2470         get_device(&conn->dev);
2471 }
2472 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2473
2474 /*
2475  * iscsi interface functions
2476  */
2477 static struct iscsi_internal *
2478 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2479 {
2480         struct iscsi_internal *priv;
2481         unsigned long flags;
2482
2483         spin_lock_irqsave(&iscsi_transport_lock, flags);
2484         list_for_each_entry(priv, &iscsi_transports, list) {
2485                 if (tt == priv->iscsi_transport) {
2486                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2487                         return priv;
2488                 }
2489         }
2490         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2491         return NULL;
2492 }
2493
2494 static int
2495 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2496 {
2497         return nlmsg_multicast(nls, skb, 0, group, gfp);
2498 }
2499
2500 static int
2501 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2502 {
2503         return nlmsg_unicast(nls, skb, portid);
2504 }
2505
2506 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2507                    char *data, uint32_t data_size)
2508 {
2509         struct nlmsghdr *nlh;
2510         struct sk_buff *skb;
2511         struct iscsi_uevent *ev;
2512         char *pdu;
2513         struct iscsi_internal *priv;
2514         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2515                                    data_size);
2516
2517         priv = iscsi_if_transport_lookup(conn->transport);
2518         if (!priv)
2519                 return -EINVAL;
2520
2521         skb = alloc_skb(len, GFP_ATOMIC);
2522         if (!skb) {
2523                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2524                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2525                                       "control PDU: OOM\n");
2526                 return -ENOMEM;
2527         }
2528
2529         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2530         ev = nlmsg_data(nlh);
2531         memset(ev, 0, sizeof(*ev));
2532         ev->transport_handle = iscsi_handle(conn->transport);
2533         ev->type = ISCSI_KEVENT_RECV_PDU;
2534         ev->r.recv_req.cid = conn->cid;
2535         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2536         pdu = (char*)ev + sizeof(*ev);
2537         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2538         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2539
2540         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2541 }
2542 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2543
2544 int iscsi_offload_mesg(struct Scsi_Host *shost,
2545                        struct iscsi_transport *transport, uint32_t type,
2546                        char *data, uint16_t data_size)
2547 {
2548         struct nlmsghdr *nlh;
2549         struct sk_buff *skb;
2550         struct iscsi_uevent *ev;
2551         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2552
2553         skb = alloc_skb(len, GFP_ATOMIC);
2554         if (!skb) {
2555                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2556                 return -ENOMEM;
2557         }
2558
2559         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2560         ev = nlmsg_data(nlh);
2561         memset(ev, 0, sizeof(*ev));
2562         ev->type = type;
2563         ev->transport_handle = iscsi_handle(transport);
2564         switch (type) {
2565         case ISCSI_KEVENT_PATH_REQ:
2566                 ev->r.req_path.host_no = shost->host_no;
2567                 break;
2568         case ISCSI_KEVENT_IF_DOWN:
2569                 ev->r.notify_if_down.host_no = shost->host_no;
2570                 break;
2571         }
2572
2573         memcpy((char *)ev + sizeof(*ev), data, data_size);
2574
2575         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2576 }
2577 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2578
2579 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2580 {
2581         struct nlmsghdr *nlh;
2582         struct sk_buff  *skb;
2583         struct iscsi_uevent *ev;
2584         struct iscsi_internal *priv;
2585         int len = nlmsg_total_size(sizeof(*ev));
2586
2587         if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags))
2588                 queue_work(iscsi_conn_cleanup_workq, &conn->cleanup_work);
2589
2590         priv = iscsi_if_transport_lookup(conn->transport);
2591         if (!priv)
2592                 return;
2593
2594         skb = alloc_skb(len, GFP_ATOMIC);
2595         if (!skb) {
2596                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2597                                       "conn error (%d)\n", error);
2598                 return;
2599         }
2600
2601         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2602         ev = nlmsg_data(nlh);
2603         ev->transport_handle = iscsi_handle(conn->transport);
2604         ev->type = ISCSI_KEVENT_CONN_ERROR;
2605         ev->r.connerror.error = error;
2606         ev->r.connerror.cid = conn->cid;
2607         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2608
2609         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2610
2611         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2612                               error);
2613 }
2614 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2615
2616 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2617                             enum iscsi_conn_state state)
2618 {
2619         struct nlmsghdr *nlh;
2620         struct sk_buff  *skb;
2621         struct iscsi_uevent *ev;
2622         struct iscsi_internal *priv;
2623         int len = nlmsg_total_size(sizeof(*ev));
2624
2625         priv = iscsi_if_transport_lookup(conn->transport);
2626         if (!priv)
2627                 return;
2628
2629         skb = alloc_skb(len, GFP_ATOMIC);
2630         if (!skb) {
2631                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2632                                       "conn login (%d)\n", state);
2633                 return;
2634         }
2635
2636         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2637         ev = nlmsg_data(nlh);
2638         ev->transport_handle = iscsi_handle(conn->transport);
2639         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2640         ev->r.conn_login.state = state;
2641         ev->r.conn_login.cid = conn->cid;
2642         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2643         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2644
2645         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2646                               state);
2647 }
2648 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2649
2650 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2651                            enum iscsi_host_event_code code, uint32_t data_size,
2652                            uint8_t *data)
2653 {
2654         struct nlmsghdr *nlh;
2655         struct sk_buff *skb;
2656         struct iscsi_uevent *ev;
2657         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2658
2659         skb = alloc_skb(len, GFP_NOIO);
2660         if (!skb) {
2661                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2662                        host_no, code);
2663                 return;
2664         }
2665
2666         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2667         ev = nlmsg_data(nlh);
2668         ev->transport_handle = iscsi_handle(transport);
2669         ev->type = ISCSI_KEVENT_HOST_EVENT;
2670         ev->r.host_event.host_no = host_no;
2671         ev->r.host_event.code = code;
2672         ev->r.host_event.data_size = data_size;
2673
2674         if (data_size)
2675                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2676
2677         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2678 }
2679 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2680
2681 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2682                            uint32_t status, uint32_t pid, uint32_t data_size,
2683                            uint8_t *data)
2684 {
2685         struct nlmsghdr *nlh;
2686         struct sk_buff *skb;
2687         struct iscsi_uevent *ev;
2688         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2689
2690         skb = alloc_skb(len, GFP_NOIO);
2691         if (!skb) {
2692                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2693                 return;
2694         }
2695
2696         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2697         ev = nlmsg_data(nlh);
2698         ev->transport_handle = iscsi_handle(transport);
2699         ev->type = ISCSI_KEVENT_PING_COMP;
2700         ev->r.ping_comp.host_no = host_no;
2701         ev->r.ping_comp.status = status;
2702         ev->r.ping_comp.pid = pid;
2703         ev->r.ping_comp.data_size = data_size;
2704         memcpy((char *)ev + sizeof(*ev), data, data_size);
2705
2706         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2707 }
2708 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2709
2710 static int
2711 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2712 {
2713         struct sk_buff  *skb;
2714         struct nlmsghdr *nlh;
2715         int len = nlmsg_total_size(size);
2716
2717         skb = alloc_skb(len, GFP_ATOMIC);
2718         if (!skb) {
2719                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2720                 return -ENOMEM;
2721         }
2722
2723         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2724         memcpy(nlmsg_data(nlh), payload, size);
2725         return iscsi_unicast_skb(skb, portid);
2726 }
2727
2728 static int
2729 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2730 {
2731         struct iscsi_uevent *ev = nlmsg_data(nlh);
2732         struct iscsi_stats *stats;
2733         struct sk_buff *skbstat;
2734         struct iscsi_cls_conn *conn;
2735         struct nlmsghdr *nlhstat;
2736         struct iscsi_uevent *evstat;
2737         struct iscsi_internal *priv;
2738         int len = nlmsg_total_size(sizeof(*ev) +
2739                                    sizeof(struct iscsi_stats) +
2740                                    sizeof(struct iscsi_stats_custom) *
2741                                    ISCSI_STATS_CUSTOM_MAX);
2742         int err = 0;
2743
2744         priv = iscsi_if_transport_lookup(transport);
2745         if (!priv)
2746                 return -EINVAL;
2747
2748         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2749         if (!conn)
2750                 return -EEXIST;
2751
2752         do {
2753                 int actual_size;
2754
2755                 skbstat = alloc_skb(len, GFP_ATOMIC);
2756                 if (!skbstat) {
2757                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2758                                               "deliver stats: OOM\n");
2759                         return -ENOMEM;
2760                 }
2761
2762                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2763                                       (len - sizeof(*nlhstat)), 0);
2764                 evstat = nlmsg_data(nlhstat);
2765                 memset(evstat, 0, sizeof(*evstat));
2766                 evstat->transport_handle = iscsi_handle(conn->transport);
2767                 evstat->type = nlh->nlmsg_type;
2768                 evstat->u.get_stats.cid =
2769                         ev->u.get_stats.cid;
2770                 evstat->u.get_stats.sid =
2771                         ev->u.get_stats.sid;
2772                 stats = (struct iscsi_stats *)
2773                         ((char*)evstat + sizeof(*evstat));
2774                 memset(stats, 0, sizeof(*stats));
2775
2776                 transport->get_stats(conn, stats);
2777                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2778                                                sizeof(struct iscsi_stats) +
2779                                                sizeof(struct iscsi_stats_custom) *
2780                                                stats->custom_length);
2781                 actual_size -= sizeof(*nlhstat);
2782                 actual_size = nlmsg_msg_size(actual_size);
2783                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2784                 nlhstat->nlmsg_len = actual_size;
2785
2786                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2787                                           GFP_ATOMIC);
2788         } while (err < 0 && err != -ECONNREFUSED);
2789
2790         return err;
2791 }
2792
2793 /**
2794  * iscsi_session_event - send session destr. completion event
2795  * @session: iscsi class session
2796  * @event: type of event
2797  */
2798 int iscsi_session_event(struct iscsi_cls_session *session,
2799                         enum iscsi_uevent_e event)
2800 {
2801         struct iscsi_internal *priv;
2802         struct Scsi_Host *shost;
2803         struct iscsi_uevent *ev;
2804         struct sk_buff  *skb;
2805         struct nlmsghdr *nlh;
2806         int rc, len = nlmsg_total_size(sizeof(*ev));
2807
2808         priv = iscsi_if_transport_lookup(session->transport);
2809         if (!priv)
2810                 return -EINVAL;
2811         shost = iscsi_session_to_shost(session);
2812
2813         skb = alloc_skb(len, GFP_KERNEL);
2814         if (!skb) {
2815                 iscsi_cls_session_printk(KERN_ERR, session,
2816                                          "Cannot notify userspace of session "
2817                                          "event %u\n", event);
2818                 return -ENOMEM;
2819         }
2820
2821         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2822         ev = nlmsg_data(nlh);
2823         ev->transport_handle = iscsi_handle(session->transport);
2824
2825         ev->type = event;
2826         switch (event) {
2827         case ISCSI_KEVENT_DESTROY_SESSION:
2828                 ev->r.d_session.host_no = shost->host_no;
2829                 ev->r.d_session.sid = session->sid;
2830                 break;
2831         case ISCSI_KEVENT_CREATE_SESSION:
2832                 ev->r.c_session_ret.host_no = shost->host_no;
2833                 ev->r.c_session_ret.sid = session->sid;
2834                 break;
2835         case ISCSI_KEVENT_UNBIND_SESSION:
2836                 ev->r.unbind_session.host_no = shost->host_no;
2837                 ev->r.unbind_session.sid = session->sid;
2838                 break;
2839         default:
2840                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2841                                          "%u.\n", event);
2842                 kfree_skb(skb);
2843                 return -EINVAL;
2844         }
2845
2846         /*
2847          * this will occur if the daemon is not up, so we just warn
2848          * the user and when the daemon is restarted it will handle it
2849          */
2850         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2851         if (rc == -ESRCH)
2852                 iscsi_cls_session_printk(KERN_ERR, session,
2853                                          "Cannot notify userspace of session "
2854                                          "event %u. Check iscsi daemon\n",
2855                                          event);
2856
2857         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2858                                 event, rc);
2859         return rc;
2860 }
2861 EXPORT_SYMBOL_GPL(iscsi_session_event);
2862
2863 static int
2864 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2865                         struct iscsi_uevent *ev, pid_t pid,
2866                         uint32_t initial_cmdsn, uint16_t cmds_max,
2867                         uint16_t queue_depth)
2868 {
2869         struct iscsi_transport *transport = priv->iscsi_transport;
2870         struct iscsi_cls_session *session;
2871         struct Scsi_Host *shost;
2872
2873         session = transport->create_session(ep, cmds_max, queue_depth,
2874                                             initial_cmdsn);
2875         if (!session)
2876                 return -ENOMEM;
2877
2878         session->creator = pid;
2879         shost = iscsi_session_to_shost(session);
2880         ev->r.c_session_ret.host_no = shost->host_no;
2881         ev->r.c_session_ret.sid = session->sid;
2882         ISCSI_DBG_TRANS_SESSION(session,
2883                                 "Completed creating transport session\n");
2884         return 0;
2885 }
2886
2887 static int
2888 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2889 {
2890         struct iscsi_cls_conn *conn;
2891         struct iscsi_cls_session *session;
2892
2893         session = iscsi_session_lookup(ev->u.c_conn.sid);
2894         if (!session) {
2895                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2896                        ev->u.c_conn.sid);
2897                 return -EINVAL;
2898         }
2899
2900         conn = transport->create_conn(session, ev->u.c_conn.cid);
2901         if (!conn) {
2902                 iscsi_cls_session_printk(KERN_ERR, session,
2903                                          "couldn't create a new connection.");
2904                 return -ENOMEM;
2905         }
2906
2907         ev->r.c_conn_ret.sid = session->sid;
2908         ev->r.c_conn_ret.cid = conn->cid;
2909
2910         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2911         return 0;
2912 }
2913
2914 static int
2915 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2916 {
2917         struct iscsi_cls_conn *conn;
2918
2919         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2920         if (!conn)
2921                 return -EINVAL;
2922
2923         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2924         flush_work(&conn->cleanup_work);
2925         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2926
2927         if (transport->destroy_conn)
2928                 transport->destroy_conn(conn);
2929         return 0;
2930 }
2931
2932 static int
2933 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2934 {
2935         char *data = (char*)ev + sizeof(*ev);
2936         struct iscsi_cls_conn *conn;
2937         struct iscsi_cls_session *session;
2938         int err = 0, value = 0;
2939
2940         if (ev->u.set_param.len > PAGE_SIZE)
2941                 return -EINVAL;
2942
2943         session = iscsi_session_lookup(ev->u.set_param.sid);
2944         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2945         if (!conn || !session)
2946                 return -EINVAL;
2947
2948         switch (ev->u.set_param.param) {
2949         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2950                 sscanf(data, "%d", &value);
2951                 if (!session->recovery_tmo_sysfs_override)
2952                         session->recovery_tmo = value;
2953                 break;
2954         default:
2955                 err = transport->set_param(conn, ev->u.set_param.param,
2956                                            data, ev->u.set_param.len);
2957                 if ((conn->state == ISCSI_CONN_BOUND) ||
2958                         (conn->state == ISCSI_CONN_UP)) {
2959                         err = transport->set_param(conn, ev->u.set_param.param,
2960                                         data, ev->u.set_param.len);
2961                 } else {
2962                         return -ENOTCONN;
2963                 }
2964         }
2965
2966         return err;
2967 }
2968
2969 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2970                                struct iscsi_uevent *ev, int msg_type)
2971 {
2972         struct iscsi_endpoint *ep;
2973         struct sockaddr *dst_addr;
2974         struct Scsi_Host *shost = NULL;
2975         int non_blocking, err = 0;
2976
2977         if (!transport->ep_connect)
2978                 return -EINVAL;
2979
2980         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2981                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2982                 if (!shost) {
2983                         printk(KERN_ERR "ep connect failed. Could not find "
2984                                "host no %u\n",
2985                                ev->u.ep_connect_through_host.host_no);
2986                         return -ENODEV;
2987                 }
2988                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2989         } else
2990                 non_blocking = ev->u.ep_connect.non_blocking;
2991
2992         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2993         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2994         if (IS_ERR(ep)) {
2995                 err = PTR_ERR(ep);
2996                 goto release_host;
2997         }
2998
2999         ev->r.ep_connect_ret.handle = ep->id;
3000 release_host:
3001         if (shost)
3002                 scsi_host_put(shost);
3003         return err;
3004 }
3005
3006 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3007                                   u64 ep_handle)
3008 {
3009         struct iscsi_cls_conn *conn;
3010         struct iscsi_endpoint *ep;
3011
3012         if (!transport->ep_disconnect)
3013                 return -EINVAL;
3014
3015         ep = iscsi_lookup_endpoint(ep_handle);
3016         if (!ep)
3017                 return -EINVAL;
3018
3019         conn = ep->conn;
3020         if (!conn) {
3021                 /*
3022                  * conn was not even bound yet, so we can't get iscsi conn
3023                  * failures yet.
3024                  */
3025                 transport->ep_disconnect(ep);
3026                 goto put_ep;
3027         }
3028
3029         mutex_lock(&conn->ep_mutex);
3030         /* Check if this was a conn error and the kernel took ownership */
3031         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3032                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
3033                 mutex_unlock(&conn->ep_mutex);
3034
3035                 flush_work(&conn->cleanup_work);
3036                 goto put_ep;
3037         }
3038
3039         iscsi_ep_disconnect(conn, false);
3040         mutex_unlock(&conn->ep_mutex);
3041 put_ep:
3042         iscsi_put_endpoint(ep);
3043         return 0;
3044 }
3045
3046 static int
3047 iscsi_if_transport_ep(struct iscsi_transport *transport,
3048                       struct iscsi_uevent *ev, int msg_type)
3049 {
3050         struct iscsi_endpoint *ep;
3051         int rc = 0;
3052
3053         switch (msg_type) {
3054         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3055         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3056                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3057                 break;
3058         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3059                 if (!transport->ep_poll)
3060                         return -EINVAL;
3061
3062                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3063                 if (!ep)
3064                         return -EINVAL;
3065
3066                 ev->r.retcode = transport->ep_poll(ep,
3067                                                    ev->u.ep_poll.timeout_ms);
3068                 iscsi_put_endpoint(ep);
3069                 break;
3070         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3071                 rc = iscsi_if_ep_disconnect(transport,
3072                                             ev->u.ep_disconnect.ep_handle);
3073                 break;
3074         }
3075         return rc;
3076 }
3077
3078 static int
3079 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3080                 struct iscsi_uevent *ev)
3081 {
3082         struct Scsi_Host *shost;
3083         struct sockaddr *dst_addr;
3084         int err;
3085
3086         if (!transport->tgt_dscvr)
3087                 return -EINVAL;
3088
3089         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3090         if (!shost) {
3091                 printk(KERN_ERR "target discovery could not find host no %u\n",
3092                        ev->u.tgt_dscvr.host_no);
3093                 return -ENODEV;
3094         }
3095
3096
3097         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3098         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3099                                    ev->u.tgt_dscvr.enable, dst_addr);
3100         scsi_host_put(shost);
3101         return err;
3102 }
3103
3104 static int
3105 iscsi_set_host_param(struct iscsi_transport *transport,
3106                      struct iscsi_uevent *ev)
3107 {
3108         char *data = (char*)ev + sizeof(*ev);
3109         struct Scsi_Host *shost;
3110         int err;
3111
3112         if (!transport->set_host_param)
3113                 return -ENOSYS;
3114
3115         if (ev->u.set_host_param.len > PAGE_SIZE)
3116                 return -EINVAL;
3117
3118         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3119         if (!shost) {
3120                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3121                        ev->u.set_host_param.host_no);
3122                 return -ENODEV;
3123         }
3124
3125         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3126                                         data, ev->u.set_host_param.len);
3127         scsi_host_put(shost);
3128         return err;
3129 }
3130
3131 static int
3132 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3133 {
3134         struct Scsi_Host *shost;
3135         struct iscsi_path *params;
3136         int err;
3137
3138         if (!transport->set_path)
3139                 return -ENOSYS;
3140
3141         shost = scsi_host_lookup(ev->u.set_path.host_no);
3142         if (!shost) {
3143                 printk(KERN_ERR "set path could not find host no %u\n",
3144                        ev->u.set_path.host_no);
3145                 return -ENODEV;
3146         }
3147
3148         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3149         err = transport->set_path(shost, params);
3150
3151         scsi_host_put(shost);
3152         return err;
3153 }
3154
3155 static int iscsi_session_has_conns(int sid)
3156 {
3157         struct iscsi_cls_conn *conn;
3158         unsigned long flags;
3159         int found = 0;
3160
3161         spin_lock_irqsave(&connlock, flags);
3162         list_for_each_entry(conn, &connlist, conn_list) {
3163                 if (iscsi_conn_get_sid(conn) == sid) {
3164                         found = 1;
3165                         break;
3166                 }
3167         }
3168         spin_unlock_irqrestore(&connlock, flags);
3169
3170         return found;
3171 }
3172
3173 static int
3174 iscsi_set_iface_params(struct iscsi_transport *transport,
3175                        struct iscsi_uevent *ev, uint32_t len)
3176 {
3177         char *data = (char *)ev + sizeof(*ev);
3178         struct Scsi_Host *shost;
3179         int err;
3180
3181         if (!transport->set_iface_param)
3182                 return -ENOSYS;
3183
3184         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3185         if (!shost) {
3186                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3187                        ev->u.set_iface_params.host_no);
3188                 return -ENODEV;
3189         }
3190
3191         err = transport->set_iface_param(shost, data, len);
3192         scsi_host_put(shost);
3193         return err;
3194 }
3195
3196 static int
3197 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3198 {
3199         struct Scsi_Host *shost;
3200         struct sockaddr *dst_addr;
3201         int err;
3202
3203         if (!transport->send_ping)
3204                 return -ENOSYS;
3205
3206         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3207         if (!shost) {
3208                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3209                        ev->u.iscsi_ping.host_no);
3210                 return -ENODEV;
3211         }
3212
3213         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3214         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3215                                    ev->u.iscsi_ping.iface_type,
3216                                    ev->u.iscsi_ping.payload_size,
3217                                    ev->u.iscsi_ping.pid,
3218                                    dst_addr);
3219         scsi_host_put(shost);
3220         return err;
3221 }
3222
3223 static int
3224 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3225 {
3226         struct iscsi_uevent *ev = nlmsg_data(nlh);
3227         struct Scsi_Host *shost = NULL;
3228         struct iscsi_chap_rec *chap_rec;
3229         struct iscsi_internal *priv;
3230         struct sk_buff *skbchap;
3231         struct nlmsghdr *nlhchap;
3232         struct iscsi_uevent *evchap;
3233         uint32_t chap_buf_size;
3234         int len, err = 0;
3235         char *buf;
3236
3237         if (!transport->get_chap)
3238                 return -EINVAL;
3239
3240         priv = iscsi_if_transport_lookup(transport);
3241         if (!priv)
3242                 return -EINVAL;
3243
3244         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3245         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3246
3247         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3248         if (!shost) {
3249                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3250                        __func__, ev->u.get_chap.host_no);
3251                 return -ENODEV;
3252         }
3253
3254         do {
3255                 int actual_size;
3256
3257                 skbchap = alloc_skb(len, GFP_KERNEL);
3258                 if (!skbchap) {
3259                         printk(KERN_ERR "can not deliver chap: OOM\n");
3260                         err = -ENOMEM;
3261                         goto exit_get_chap;
3262                 }
3263
3264                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3265                                       (len - sizeof(*nlhchap)), 0);
3266                 evchap = nlmsg_data(nlhchap);
3267                 memset(evchap, 0, sizeof(*evchap));
3268                 evchap->transport_handle = iscsi_handle(transport);
3269                 evchap->type = nlh->nlmsg_type;
3270                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3271                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3272                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3273                 buf = (char *)evchap + sizeof(*evchap);
3274                 memset(buf, 0, chap_buf_size);
3275
3276                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3277                                     &evchap->u.get_chap.num_entries, buf);
3278
3279                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3280                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3281                 nlhchap->nlmsg_len = actual_size;
3282
3283                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3284                                           GFP_KERNEL);
3285         } while (err < 0 && err != -ECONNREFUSED);
3286
3287 exit_get_chap:
3288         scsi_host_put(shost);
3289         return err;
3290 }
3291
3292 static int iscsi_set_chap(struct iscsi_transport *transport,
3293                           struct iscsi_uevent *ev, uint32_t len)
3294 {
3295         char *data = (char *)ev + sizeof(*ev);
3296         struct Scsi_Host *shost;
3297         int err = 0;
3298
3299         if (!transport->set_chap)
3300                 return -ENOSYS;
3301
3302         shost = scsi_host_lookup(ev->u.set_path.host_no);
3303         if (!shost) {
3304                 pr_err("%s could not find host no %u\n",
3305                        __func__, ev->u.set_path.host_no);
3306                 return -ENODEV;
3307         }
3308
3309         err = transport->set_chap(shost, data, len);
3310         scsi_host_put(shost);
3311         return err;
3312 }
3313
3314 static int iscsi_delete_chap(struct iscsi_transport *transport,
3315                              struct iscsi_uevent *ev)
3316 {
3317         struct Scsi_Host *shost;
3318         int err = 0;
3319
3320         if (!transport->delete_chap)
3321                 return -ENOSYS;
3322
3323         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3324         if (!shost) {
3325                 printk(KERN_ERR "%s could not find host no %u\n",
3326                        __func__, ev->u.delete_chap.host_no);
3327                 return -ENODEV;
3328         }
3329
3330         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3331         scsi_host_put(shost);
3332         return err;
3333 }
3334
3335 static const struct {
3336         enum iscsi_discovery_parent_type value;
3337         char                            *name;
3338 } iscsi_discovery_parent_names[] = {
3339         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3340         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3341         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3342 };
3343
3344 char *iscsi_get_discovery_parent_name(int parent_type)
3345 {
3346         int i;
3347         char *state = "Unknown!";
3348
3349         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3350                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3351                         state = iscsi_discovery_parent_names[i].name;
3352                         break;
3353                 }
3354         }
3355         return state;
3356 }
3357 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3358
3359 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3360                                      struct iscsi_uevent *ev, uint32_t len)
3361 {
3362         char *data = (char *)ev + sizeof(*ev);
3363         struct Scsi_Host *shost;
3364         struct iscsi_bus_flash_session *fnode_sess;
3365         struct iscsi_bus_flash_conn *fnode_conn;
3366         struct device *dev;
3367         uint32_t idx;
3368         int err = 0;
3369
3370         if (!transport->set_flashnode_param) {
3371                 err = -ENOSYS;
3372                 goto exit_set_fnode;
3373         }
3374
3375         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3376         if (!shost) {
3377                 pr_err("%s could not find host no %u\n",
3378                        __func__, ev->u.set_flashnode.host_no);
3379                 err = -ENODEV;
3380                 goto exit_set_fnode;
3381         }
3382
3383         idx = ev->u.set_flashnode.flashnode_idx;
3384         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3385         if (!fnode_sess) {
3386                 pr_err("%s could not find flashnode %u for host no %u\n",
3387                        __func__, idx, ev->u.set_flashnode.host_no);
3388                 err = -ENODEV;
3389                 goto put_host;
3390         }
3391
3392         dev = iscsi_find_flashnode_conn(fnode_sess);
3393         if (!dev) {
3394                 err = -ENODEV;
3395                 goto put_sess;
3396         }
3397
3398         fnode_conn = iscsi_dev_to_flash_conn(dev);
3399         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3400         put_device(dev);
3401
3402 put_sess:
3403         put_device(&fnode_sess->dev);
3404
3405 put_host:
3406         scsi_host_put(shost);
3407
3408 exit_set_fnode:
3409         return err;
3410 }
3411
3412 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3413                                struct iscsi_uevent *ev, uint32_t len)
3414 {
3415         char *data = (char *)ev + sizeof(*ev);
3416         struct Scsi_Host *shost;
3417         int index;
3418         int err = 0;
3419
3420         if (!transport->new_flashnode) {
3421                 err = -ENOSYS;
3422                 goto exit_new_fnode;
3423         }
3424
3425         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3426         if (!shost) {
3427                 pr_err("%s could not find host no %u\n",
3428                        __func__, ev->u.new_flashnode.host_no);
3429                 err = -ENODEV;
3430                 goto put_host;
3431         }
3432
3433         index = transport->new_flashnode(shost, data, len);
3434
3435         if (index >= 0)
3436                 ev->r.new_flashnode_ret.flashnode_idx = index;
3437         else
3438                 err = -EIO;
3439
3440 put_host:
3441         scsi_host_put(shost);
3442
3443 exit_new_fnode:
3444         return err;
3445 }
3446
3447 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3448                                struct iscsi_uevent *ev)
3449 {
3450         struct Scsi_Host *shost;
3451         struct iscsi_bus_flash_session *fnode_sess;
3452         uint32_t idx;
3453         int err = 0;
3454
3455         if (!transport->del_flashnode) {
3456                 err = -ENOSYS;
3457                 goto exit_del_fnode;
3458         }
3459
3460         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3461         if (!shost) {
3462                 pr_err("%s could not find host no %u\n",
3463                        __func__, ev->u.del_flashnode.host_no);
3464                 err = -ENODEV;
3465                 goto put_host;
3466         }
3467
3468         idx = ev->u.del_flashnode.flashnode_idx;
3469         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3470         if (!fnode_sess) {
3471                 pr_err("%s could not find flashnode %u for host no %u\n",
3472                        __func__, idx, ev->u.del_flashnode.host_no);
3473                 err = -ENODEV;
3474                 goto put_host;
3475         }
3476
3477         err = transport->del_flashnode(fnode_sess);
3478         put_device(&fnode_sess->dev);
3479
3480 put_host:
3481         scsi_host_put(shost);
3482
3483 exit_del_fnode:
3484         return err;
3485 }
3486
3487 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3488                                  struct iscsi_uevent *ev)
3489 {
3490         struct Scsi_Host *shost;
3491         struct iscsi_bus_flash_session *fnode_sess;
3492         struct iscsi_bus_flash_conn *fnode_conn;
3493         struct device *dev;
3494         uint32_t idx;
3495         int err = 0;
3496
3497         if (!transport->login_flashnode) {
3498                 err = -ENOSYS;
3499                 goto exit_login_fnode;
3500         }
3501
3502         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3503         if (!shost) {
3504                 pr_err("%s could not find host no %u\n",
3505                        __func__, ev->u.login_flashnode.host_no);
3506                 err = -ENODEV;
3507                 goto put_host;
3508         }
3509
3510         idx = ev->u.login_flashnode.flashnode_idx;
3511         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3512         if (!fnode_sess) {
3513                 pr_err("%s could not find flashnode %u for host no %u\n",
3514                        __func__, idx, ev->u.login_flashnode.host_no);
3515                 err = -ENODEV;
3516                 goto put_host;
3517         }
3518
3519         dev = iscsi_find_flashnode_conn(fnode_sess);
3520         if (!dev) {
3521                 err = -ENODEV;
3522                 goto put_sess;
3523         }
3524
3525         fnode_conn = iscsi_dev_to_flash_conn(dev);
3526         err = transport->login_flashnode(fnode_sess, fnode_conn);
3527         put_device(dev);
3528
3529 put_sess:
3530         put_device(&fnode_sess->dev);
3531
3532 put_host:
3533         scsi_host_put(shost);
3534
3535 exit_login_fnode:
3536         return err;
3537 }
3538
3539 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3540                                   struct iscsi_uevent *ev)
3541 {
3542         struct Scsi_Host *shost;
3543         struct iscsi_bus_flash_session *fnode_sess;
3544         struct iscsi_bus_flash_conn *fnode_conn;
3545         struct device *dev;
3546         uint32_t idx;
3547         int err = 0;
3548
3549         if (!transport->logout_flashnode) {
3550                 err = -ENOSYS;
3551                 goto exit_logout_fnode;
3552         }
3553
3554         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3555         if (!shost) {
3556                 pr_err("%s could not find host no %u\n",
3557                        __func__, ev->u.logout_flashnode.host_no);
3558                 err = -ENODEV;
3559                 goto put_host;
3560         }
3561
3562         idx = ev->u.logout_flashnode.flashnode_idx;
3563         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3564         if (!fnode_sess) {
3565                 pr_err("%s could not find flashnode %u for host no %u\n",
3566                        __func__, idx, ev->u.logout_flashnode.host_no);
3567                 err = -ENODEV;
3568                 goto put_host;
3569         }
3570
3571         dev = iscsi_find_flashnode_conn(fnode_sess);
3572         if (!dev) {
3573                 err = -ENODEV;
3574                 goto put_sess;
3575         }
3576
3577         fnode_conn = iscsi_dev_to_flash_conn(dev);
3578
3579         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3580         put_device(dev);
3581
3582 put_sess:
3583         put_device(&fnode_sess->dev);
3584
3585 put_host:
3586         scsi_host_put(shost);
3587
3588 exit_logout_fnode:
3589         return err;
3590 }
3591
3592 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3593                                       struct iscsi_uevent *ev)
3594 {
3595         struct Scsi_Host *shost;
3596         struct iscsi_cls_session *session;
3597         int err = 0;
3598
3599         if (!transport->logout_flashnode_sid) {
3600                 err = -ENOSYS;
3601                 goto exit_logout_sid;
3602         }
3603
3604         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3605         if (!shost) {
3606                 pr_err("%s could not find host no %u\n",
3607                        __func__, ev->u.logout_flashnode.host_no);
3608                 err = -ENODEV;
3609                 goto put_host;
3610         }
3611
3612         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3613         if (!session) {
3614                 pr_err("%s could not find session id %u\n",
3615                        __func__, ev->u.logout_flashnode_sid.sid);
3616                 err = -EINVAL;
3617                 goto put_host;
3618         }
3619
3620         err = transport->logout_flashnode_sid(session);
3621
3622 put_host:
3623         scsi_host_put(shost);
3624
3625 exit_logout_sid:
3626         return err;
3627 }
3628
3629 static int
3630 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3631 {
3632         struct iscsi_uevent *ev = nlmsg_data(nlh);
3633         struct Scsi_Host *shost = NULL;
3634         struct iscsi_internal *priv;
3635         struct sk_buff *skbhost_stats;
3636         struct nlmsghdr *nlhhost_stats;
3637         struct iscsi_uevent *evhost_stats;
3638         int host_stats_size = 0;
3639         int len, err = 0;
3640         char *buf;
3641
3642         if (!transport->get_host_stats)
3643                 return -ENOSYS;
3644
3645         priv = iscsi_if_transport_lookup(transport);
3646         if (!priv)
3647                 return -EINVAL;
3648
3649         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3650         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3651
3652         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3653         if (!shost) {
3654                 pr_err("%s: failed. Could not find host no %u\n",
3655                        __func__, ev->u.get_host_stats.host_no);
3656                 return -ENODEV;
3657         }
3658
3659         do {
3660                 int actual_size;
3661
3662                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3663                 if (!skbhost_stats) {
3664                         pr_err("cannot deliver host stats: OOM\n");
3665                         err = -ENOMEM;
3666                         goto exit_host_stats;
3667                 }
3668
3669                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3670                                       (len - sizeof(*nlhhost_stats)), 0);
3671                 evhost_stats = nlmsg_data(nlhhost_stats);
3672                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3673                 evhost_stats->transport_handle = iscsi_handle(transport);
3674                 evhost_stats->type = nlh->nlmsg_type;
3675                 evhost_stats->u.get_host_stats.host_no =
3676                                         ev->u.get_host_stats.host_no;
3677                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3678                 memset(buf, 0, host_stats_size);
3679
3680                 err = transport->get_host_stats(shost, buf, host_stats_size);
3681                 if (err) {
3682                         kfree_skb(skbhost_stats);
3683                         goto exit_host_stats;
3684                 }
3685
3686                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3687                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3688                 nlhhost_stats->nlmsg_len = actual_size;
3689
3690                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3691                                           GFP_KERNEL);
3692         } while (err < 0 && err != -ECONNREFUSED);
3693
3694 exit_host_stats:
3695         scsi_host_put(shost);
3696         return err;
3697 }
3698
3699 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3700                                    struct nlmsghdr *nlh)
3701 {
3702         struct iscsi_uevent *ev = nlmsg_data(nlh);
3703         struct iscsi_cls_session *session;
3704         struct iscsi_cls_conn *conn = NULL;
3705         struct iscsi_endpoint *ep;
3706         uint32_t pdu_len;
3707         int err = 0;
3708
3709         switch (nlh->nlmsg_type) {
3710         case ISCSI_UEVENT_CREATE_CONN:
3711                 return iscsi_if_create_conn(transport, ev);
3712         case ISCSI_UEVENT_DESTROY_CONN:
3713                 return iscsi_if_destroy_conn(transport, ev);
3714         case ISCSI_UEVENT_STOP_CONN:
3715                 return iscsi_if_stop_conn(transport, ev);
3716         }
3717
3718         /*
3719          * The following cmds need to be run under the ep_mutex so in kernel
3720          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3721          * these are running. They also must not run if we have just run a conn
3722          * cleanup because they would set the state in a way that might allow
3723          * IO or send IO themselves.
3724          */
3725         switch (nlh->nlmsg_type) {
3726         case ISCSI_UEVENT_START_CONN:
3727                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3728                                          ev->u.start_conn.cid);
3729                 break;
3730         case ISCSI_UEVENT_BIND_CONN:
3731                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3732                 break;
3733         case ISCSI_UEVENT_SEND_PDU:
3734                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3735                 break;
3736         }
3737
3738         if (!conn)
3739                 return -EINVAL;
3740
3741         mutex_lock(&conn->ep_mutex);
3742         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3743                 mutex_unlock(&conn->ep_mutex);
3744                 ev->r.retcode = -ENOTCONN;
3745                 return 0;
3746         }
3747
3748         switch (nlh->nlmsg_type) {
3749         case ISCSI_UEVENT_BIND_CONN:
3750                 if (conn->ep) {
3751                         /*
3752                          * For offload boot support where iscsid is restarted
3753                          * during the pivot root stage, the ep will be intact
3754                          * here when the new iscsid instance starts up and
3755                          * reconnects.
3756                          */
3757                         iscsi_ep_disconnect(conn, true);
3758                 }
3759
3760                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3761                 if (!session) {
3762                         err = -EINVAL;
3763                         break;
3764                 }
3765
3766                 ev->r.retcode = transport->bind_conn(session, conn,
3767                                                 ev->u.b_conn.transport_eph,
3768                                                 ev->u.b_conn.is_leading);
3769                 if (!ev->r.retcode)
3770                         conn->state = ISCSI_CONN_BOUND;
3771
3772                 if (ev->r.retcode || !transport->ep_connect)
3773                         break;
3774
3775                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3776                 if (ep) {
3777                         ep->conn = conn;
3778                         conn->ep = ep;
3779                         iscsi_put_endpoint(ep);
3780                 } else {
3781                         err = -ENOTCONN;
3782                         iscsi_cls_conn_printk(KERN_ERR, conn,
3783                                               "Could not set ep conn binding\n");
3784                 }
3785                 break;
3786         case ISCSI_UEVENT_START_CONN:
3787                 ev->r.retcode = transport->start_conn(conn);
3788                 if (!ev->r.retcode)
3789                         conn->state = ISCSI_CONN_UP;
3790                 break;
3791         case ISCSI_UEVENT_SEND_PDU:
3792                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3793
3794                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3795                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3796                         err = -EINVAL;
3797                         break;
3798                 }
3799
3800                 ev->r.retcode = transport->send_pdu(conn,
3801                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3802                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3803                                 ev->u.send_pdu.data_size);
3804                 break;
3805         default:
3806                 err = -ENOSYS;
3807         }
3808
3809         mutex_unlock(&conn->ep_mutex);
3810         return err;
3811 }
3812
3813 static int
3814 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3815 {
3816         int err = 0;
3817         u32 portid;
3818         struct iscsi_uevent *ev = nlmsg_data(nlh);
3819         struct iscsi_transport *transport = NULL;
3820         struct iscsi_internal *priv;
3821         struct iscsi_cls_session *session;
3822         struct iscsi_endpoint *ep = NULL;
3823
3824         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3825                 return -EPERM;
3826
3827         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3828                 *group = ISCSI_NL_GRP_UIP;
3829         else
3830                 *group = ISCSI_NL_GRP_ISCSID;
3831
3832         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3833         if (!priv)
3834                 return -EINVAL;
3835         transport = priv->iscsi_transport;
3836
3837         if (!try_module_get(transport->owner))
3838                 return -EINVAL;
3839
3840         portid = NETLINK_CB(skb).portid;
3841
3842         switch (nlh->nlmsg_type) {
3843         case ISCSI_UEVENT_CREATE_SESSION:
3844                 err = iscsi_if_create_session(priv, ep, ev,
3845                                               portid,
3846                                               ev->u.c_session.initial_cmdsn,
3847                                               ev->u.c_session.cmds_max,
3848                                               ev->u.c_session.queue_depth);
3849                 break;
3850         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3851                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3852                 if (!ep) {
3853                         err = -EINVAL;
3854                         break;
3855                 }
3856
3857                 err = iscsi_if_create_session(priv, ep, ev,
3858                                         portid,
3859                                         ev->u.c_bound_session.initial_cmdsn,
3860                                         ev->u.c_bound_session.cmds_max,
3861                                         ev->u.c_bound_session.queue_depth);
3862                 iscsi_put_endpoint(ep);
3863                 break;
3864         case ISCSI_UEVENT_DESTROY_SESSION:
3865                 session = iscsi_session_lookup(ev->u.d_session.sid);
3866                 if (!session)
3867                         err = -EINVAL;
3868                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3869                         err = -EBUSY;
3870                 else
3871                         transport->destroy_session(session);
3872                 break;
3873         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3874                 session = iscsi_session_lookup(ev->u.d_session.sid);
3875                 if (!session)
3876                         err = -EINVAL;
3877                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3878                         err = -EBUSY;
3879                 else {
3880                         unsigned long flags;
3881
3882                         /* Prevent this session from being found again */
3883                         spin_lock_irqsave(&sesslock, flags);
3884                         list_del_init(&session->sess_list);
3885                         spin_unlock_irqrestore(&sesslock, flags);
3886
3887                         queue_work(system_unbound_wq, &session->destroy_work);
3888                 }
3889                 break;
3890         case ISCSI_UEVENT_UNBIND_SESSION:
3891                 session = iscsi_session_lookup(ev->u.d_session.sid);
3892                 if (session)
3893                         scsi_queue_work(iscsi_session_to_shost(session),
3894                                         &session->unbind_work);
3895                 else
3896                         err = -EINVAL;
3897                 break;
3898         case ISCSI_UEVENT_SET_PARAM:
3899                 err = iscsi_set_param(transport, ev);
3900                 break;
3901         case ISCSI_UEVENT_CREATE_CONN:
3902         case ISCSI_UEVENT_DESTROY_CONN:
3903         case ISCSI_UEVENT_STOP_CONN:
3904         case ISCSI_UEVENT_START_CONN:
3905         case ISCSI_UEVENT_BIND_CONN:
3906         case ISCSI_UEVENT_SEND_PDU:
3907                 err = iscsi_if_transport_conn(transport, nlh);
3908                 break;
3909         case ISCSI_UEVENT_GET_STATS:
3910                 err = iscsi_if_get_stats(transport, nlh);
3911                 break;
3912         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3913         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3914         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3915         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3916                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3917                 break;
3918         case ISCSI_UEVENT_TGT_DSCVR:
3919                 err = iscsi_tgt_dscvr(transport, ev);
3920                 break;
3921         case ISCSI_UEVENT_SET_HOST_PARAM:
3922                 err = iscsi_set_host_param(transport, ev);
3923                 break;
3924         case ISCSI_UEVENT_PATH_UPDATE:
3925                 err = iscsi_set_path(transport, ev);
3926                 break;
3927         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3928                 err = iscsi_set_iface_params(transport, ev,
3929                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3930                 break;
3931         case ISCSI_UEVENT_PING:
3932                 err = iscsi_send_ping(transport, ev);
3933                 break;
3934         case ISCSI_UEVENT_GET_CHAP:
3935                 err = iscsi_get_chap(transport, nlh);
3936                 break;
3937         case ISCSI_UEVENT_DELETE_CHAP:
3938                 err = iscsi_delete_chap(transport, ev);
3939                 break;
3940         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3941                 err = iscsi_set_flashnode_param(transport, ev,
3942                                                 nlmsg_attrlen(nlh,
3943                                                               sizeof(*ev)));
3944                 break;
3945         case ISCSI_UEVENT_NEW_FLASHNODE:
3946                 err = iscsi_new_flashnode(transport, ev,
3947                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3948                 break;
3949         case ISCSI_UEVENT_DEL_FLASHNODE:
3950                 err = iscsi_del_flashnode(transport, ev);
3951                 break;
3952         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3953                 err = iscsi_login_flashnode(transport, ev);
3954                 break;
3955         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3956                 err = iscsi_logout_flashnode(transport, ev);
3957                 break;
3958         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3959                 err = iscsi_logout_flashnode_sid(transport, ev);
3960                 break;
3961         case ISCSI_UEVENT_SET_CHAP:
3962                 err = iscsi_set_chap(transport, ev,
3963                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3964                 break;
3965         case ISCSI_UEVENT_GET_HOST_STATS:
3966                 err = iscsi_get_host_stats(transport, nlh);
3967                 break;
3968         default:
3969                 err = -ENOSYS;
3970                 break;
3971         }
3972
3973         module_put(transport->owner);
3974         return err;
3975 }
3976
3977 /*
3978  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3979  * Malformed skbs with wrong lengths or invalid creds are not processed.
3980  */
3981 static void
3982 iscsi_if_rx(struct sk_buff *skb)
3983 {
3984         u32 portid = NETLINK_CB(skb).portid;
3985
3986         mutex_lock(&rx_queue_mutex);
3987         while (skb->len >= NLMSG_HDRLEN) {
3988                 int err;
3989                 uint32_t rlen;
3990                 struct nlmsghdr *nlh;
3991                 struct iscsi_uevent *ev;
3992                 uint32_t group;
3993                 int retries = ISCSI_SEND_MAX_ALLOWED;
3994
3995                 nlh = nlmsg_hdr(skb);
3996                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3997                     skb->len < nlh->nlmsg_len) {
3998                         break;
3999                 }
4000
4001                 ev = nlmsg_data(nlh);
4002                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4003                 if (rlen > skb->len)
4004                         rlen = skb->len;
4005
4006                 err = iscsi_if_recv_msg(skb, nlh, &group);
4007                 if (err) {
4008                         ev->type = ISCSI_KEVENT_IF_ERROR;
4009                         ev->iferror = err;
4010                 }
4011                 do {
4012                         /*
4013                          * special case for GET_STATS:
4014                          * on success - sending reply and stats from
4015                          * inside of if_recv_msg(),
4016                          * on error - fall through.
4017                          */
4018                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4019                                 break;
4020                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4021                                 break;
4022                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4023                                                   ev, sizeof(*ev));
4024                         if (err == -EAGAIN && --retries < 0) {
4025                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4026                                 break;
4027                         }
4028                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4029                 skb_pull(skb, rlen);
4030         }
4031         mutex_unlock(&rx_queue_mutex);
4032 }
4033
4034 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4035 struct device_attribute dev_attr_##_prefix##_##_name =  \
4036         __ATTR(_name,_mode,_show,_store)
4037
4038 /*
4039  * iSCSI connection attrs
4040  */
4041 #define iscsi_conn_attr_show(param)                                     \
4042 static ssize_t                                                          \
4043 show_conn_param_##param(struct device *dev,                             \
4044                         struct device_attribute *attr, char *buf)       \
4045 {                                                                       \
4046         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4047         struct iscsi_transport *t = conn->transport;                    \
4048         return t->get_conn_param(conn, param, buf);                     \
4049 }
4050
4051 #define iscsi_conn_attr(field, param)                                   \
4052         iscsi_conn_attr_show(param)                                     \
4053 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4054                         NULL);
4055
4056 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4057 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4058 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4059 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4060 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4061 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4062 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4063 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4064 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4065 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4066 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4067 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4068 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4069 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4070 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4071 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4072 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4073 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4074 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4075 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4076 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4077 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4078 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4079 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4080 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4081 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4082 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4083 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4084
4085 static const char *const connection_state_names[] = {
4086         [ISCSI_CONN_UP] = "up",
4087         [ISCSI_CONN_DOWN] = "down",
4088         [ISCSI_CONN_FAILED] = "failed",
4089         [ISCSI_CONN_BOUND] = "bound"
4090 };
4091
4092 static ssize_t show_conn_state(struct device *dev,
4093                                struct device_attribute *attr, char *buf)
4094 {
4095         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4096         const char *state = "unknown";
4097
4098         if (conn->state >= 0 &&
4099             conn->state < ARRAY_SIZE(connection_state_names))
4100                 state = connection_state_names[conn->state];
4101
4102         return sysfs_emit(buf, "%s\n", state);
4103 }
4104 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4105                         NULL);
4106
4107 #define iscsi_conn_ep_attr_show(param)                                  \
4108 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4109                                           struct device_attribute *attr,\
4110                                           char *buf)                    \
4111 {                                                                       \
4112         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4113         struct iscsi_transport *t = conn->transport;                    \
4114         struct iscsi_endpoint *ep;                                      \
4115         ssize_t rc;                                                     \
4116                                                                         \
4117         /*                                                              \
4118          * Need to make sure ep_disconnect does not free the LLD's      \
4119          * interconnect resources while we are trying to read them.     \
4120          */                                                             \
4121         mutex_lock(&conn->ep_mutex);                                    \
4122         ep = conn->ep;                                                  \
4123         if (!ep && t->ep_connect) {                                     \
4124                 mutex_unlock(&conn->ep_mutex);                          \
4125                 return -ENOTCONN;                                       \
4126         }                                                               \
4127                                                                         \
4128         if (ep)                                                         \
4129                 rc = t->get_ep_param(ep, param, buf);                   \
4130         else                                                            \
4131                 rc = t->get_conn_param(conn, param, buf);               \
4132         mutex_unlock(&conn->ep_mutex);                                  \
4133         return rc;                                                      \
4134 }
4135
4136 #define iscsi_conn_ep_attr(field, param)                                \
4137         iscsi_conn_ep_attr_show(param)                                  \
4138 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4139                         show_conn_ep_param_##param, NULL);
4140
4141 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4142 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4143
4144 static struct attribute *iscsi_conn_attrs[] = {
4145         &dev_attr_conn_max_recv_dlength.attr,
4146         &dev_attr_conn_max_xmit_dlength.attr,
4147         &dev_attr_conn_header_digest.attr,
4148         &dev_attr_conn_data_digest.attr,
4149         &dev_attr_conn_ifmarker.attr,
4150         &dev_attr_conn_ofmarker.attr,
4151         &dev_attr_conn_address.attr,
4152         &dev_attr_conn_port.attr,
4153         &dev_attr_conn_exp_statsn.attr,
4154         &dev_attr_conn_persistent_address.attr,
4155         &dev_attr_conn_persistent_port.attr,
4156         &dev_attr_conn_ping_tmo.attr,
4157         &dev_attr_conn_recv_tmo.attr,
4158         &dev_attr_conn_local_port.attr,
4159         &dev_attr_conn_statsn.attr,
4160         &dev_attr_conn_keepalive_tmo.attr,
4161         &dev_attr_conn_max_segment_size.attr,
4162         &dev_attr_conn_tcp_timestamp_stat.attr,
4163         &dev_attr_conn_tcp_wsf_disable.attr,
4164         &dev_attr_conn_tcp_nagle_disable.attr,
4165         &dev_attr_conn_tcp_timer_scale.attr,
4166         &dev_attr_conn_tcp_timestamp_enable.attr,
4167         &dev_attr_conn_fragment_disable.attr,
4168         &dev_attr_conn_ipv4_tos.attr,
4169         &dev_attr_conn_ipv6_traffic_class.attr,
4170         &dev_attr_conn_ipv6_flow_label.attr,
4171         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4172         &dev_attr_conn_tcp_xmit_wsf.attr,
4173         &dev_attr_conn_tcp_recv_wsf.attr,
4174         &dev_attr_conn_local_ipaddr.attr,
4175         &dev_attr_conn_state.attr,
4176         NULL,
4177 };
4178
4179 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4180                                          struct attribute *attr, int i)
4181 {
4182         struct device *cdev = container_of(kobj, struct device, kobj);
4183         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4184         struct iscsi_transport *t = conn->transport;
4185         int param;
4186
4187         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4188                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4189         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4190                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4191         else if (attr == &dev_attr_conn_header_digest.attr)
4192                 param = ISCSI_PARAM_HDRDGST_EN;
4193         else if (attr == &dev_attr_conn_data_digest.attr)
4194                 param = ISCSI_PARAM_DATADGST_EN;
4195         else if (attr == &dev_attr_conn_ifmarker.attr)
4196                 param = ISCSI_PARAM_IFMARKER_EN;
4197         else if (attr == &dev_attr_conn_ofmarker.attr)
4198                 param = ISCSI_PARAM_OFMARKER_EN;
4199         else if (attr == &dev_attr_conn_address.attr)
4200                 param = ISCSI_PARAM_CONN_ADDRESS;
4201         else if (attr == &dev_attr_conn_port.attr)
4202                 param = ISCSI_PARAM_CONN_PORT;
4203         else if (attr == &dev_attr_conn_exp_statsn.attr)
4204                 param = ISCSI_PARAM_EXP_STATSN;
4205         else if (attr == &dev_attr_conn_persistent_address.attr)
4206                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4207         else if (attr == &dev_attr_conn_persistent_port.attr)
4208                 param = ISCSI_PARAM_PERSISTENT_PORT;
4209         else if (attr == &dev_attr_conn_ping_tmo.attr)
4210                 param = ISCSI_PARAM_PING_TMO;
4211         else if (attr == &dev_attr_conn_recv_tmo.attr)
4212                 param = ISCSI_PARAM_RECV_TMO;
4213         else if (attr == &dev_attr_conn_local_port.attr)
4214                 param = ISCSI_PARAM_LOCAL_PORT;
4215         else if (attr == &dev_attr_conn_statsn.attr)
4216                 param = ISCSI_PARAM_STATSN;
4217         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4218                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4219         else if (attr == &dev_attr_conn_max_segment_size.attr)
4220                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4221         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4222                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4223         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4224                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4225         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4226                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4227         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4228                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4229         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4230                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4231         else if (attr == &dev_attr_conn_fragment_disable.attr)
4232                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4233         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4234                 param = ISCSI_PARAM_IPV4_TOS;
4235         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4236                 param = ISCSI_PARAM_IPV6_TC;
4237         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4238                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4239         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4240                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4241         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4242                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4243         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4244                 param = ISCSI_PARAM_TCP_RECV_WSF;
4245         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4246                 param = ISCSI_PARAM_LOCAL_IPADDR;
4247         else if (attr == &dev_attr_conn_state.attr)
4248                 return S_IRUGO;
4249         else {
4250                 WARN_ONCE(1, "Invalid conn attr");
4251                 return 0;
4252         }
4253
4254         return t->attr_is_visible(ISCSI_PARAM, param);
4255 }
4256
4257 static struct attribute_group iscsi_conn_group = {
4258         .attrs = iscsi_conn_attrs,
4259         .is_visible = iscsi_conn_attr_is_visible,
4260 };
4261
4262 /*
4263  * iSCSI session attrs
4264  */
4265 #define iscsi_session_attr_show(param, perm)                            \
4266 static ssize_t                                                          \
4267 show_session_param_##param(struct device *dev,                          \
4268                            struct device_attribute *attr, char *buf)    \
4269 {                                                                       \
4270         struct iscsi_cls_session *session =                             \
4271                 iscsi_dev_to_session(dev->parent);                      \
4272         struct iscsi_transport *t = session->transport;                 \
4273                                                                         \
4274         if (perm && !capable(CAP_SYS_ADMIN))                            \
4275                 return -EACCES;                                         \
4276         return t->get_session_param(session, param, buf);               \
4277 }
4278
4279 #define iscsi_session_attr(field, param, perm)                          \
4280         iscsi_session_attr_show(param, perm)                            \
4281 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4282                         NULL);
4283 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4284 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4285 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4286 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4287 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4288 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4289 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4290 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4291 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4292 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4293 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4294 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4295 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4296 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4297 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4298 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4299 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4300 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4301 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4302 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4303 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4304 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4305 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4306 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4307 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4308 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4309 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4310 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4311 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4312 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4313 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4314 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4315 iscsi_session_attr(discovery_auth_optional,
4316                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4317 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4318 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4319 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4320 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4321 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4322 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4323 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4324
4325 static ssize_t
4326 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4327                         char *buf)
4328 {
4329         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4330         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4331 }
4332 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4333                         NULL);
4334 static ssize_t
4335 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4336                         char *buf)
4337 {
4338         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4339         return sysfs_emit(buf, "%d\n", session->creator);
4340 }
4341 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4342                         NULL);
4343 static ssize_t
4344 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4345                             char *buf)
4346 {
4347         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4348         return sysfs_emit(buf, "%d\n", session->target_id);
4349 }
4350 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4351                         show_priv_session_target_id, NULL);
4352
4353 #define iscsi_priv_session_attr_show(field, format)                     \
4354 static ssize_t                                                          \
4355 show_priv_session_##field(struct device *dev,                           \
4356                           struct device_attribute *attr, char *buf)     \
4357 {                                                                       \
4358         struct iscsi_cls_session *session =                             \
4359                         iscsi_dev_to_session(dev->parent);              \
4360         if (session->field == -1)                                       \
4361                 return sysfs_emit(buf, "off\n");                        \
4362         return sysfs_emit(buf, format"\n", session->field);             \
4363 }
4364
4365 #define iscsi_priv_session_attr_store(field)                            \
4366 static ssize_t                                                          \
4367 store_priv_session_##field(struct device *dev,                          \
4368                            struct device_attribute *attr,               \
4369                            const char *buf, size_t count)               \
4370 {                                                                       \
4371         int val;                                                        \
4372         char *cp;                                                       \
4373         struct iscsi_cls_session *session =                             \
4374                 iscsi_dev_to_session(dev->parent);                      \
4375         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4376             (session->state == ISCSI_SESSION_FAILED))                   \
4377                 return -EBUSY;                                          \
4378         if (strncmp(buf, "off", 3) == 0) {                              \
4379                 session->field = -1;                                    \
4380                 session->field##_sysfs_override = true;                 \
4381         } else {                                                        \
4382                 val = simple_strtoul(buf, &cp, 0);                      \
4383                 if (*cp != '\0' && *cp != '\n')                         \
4384                         return -EINVAL;                                 \
4385                 session->field = val;                                   \
4386                 session->field##_sysfs_override = true;                 \
4387         }                                                               \
4388         return count;                                                   \
4389 }
4390
4391 #define iscsi_priv_session_rw_attr(field, format)                       \
4392         iscsi_priv_session_attr_show(field, format)                     \
4393         iscsi_priv_session_attr_store(field)                            \
4394 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4395                         show_priv_session_##field,                      \
4396                         store_priv_session_##field)
4397
4398 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4399
4400 static struct attribute *iscsi_session_attrs[] = {
4401         &dev_attr_sess_initial_r2t.attr,
4402         &dev_attr_sess_max_outstanding_r2t.attr,
4403         &dev_attr_sess_immediate_data.attr,
4404         &dev_attr_sess_first_burst_len.attr,
4405         &dev_attr_sess_max_burst_len.attr,
4406         &dev_attr_sess_data_pdu_in_order.attr,
4407         &dev_attr_sess_data_seq_in_order.attr,
4408         &dev_attr_sess_erl.attr,
4409         &dev_attr_sess_targetname.attr,
4410         &dev_attr_sess_tpgt.attr,
4411         &dev_attr_sess_password.attr,
4412         &dev_attr_sess_password_in.attr,
4413         &dev_attr_sess_username.attr,
4414         &dev_attr_sess_username_in.attr,
4415         &dev_attr_sess_fast_abort.attr,
4416         &dev_attr_sess_abort_tmo.attr,
4417         &dev_attr_sess_lu_reset_tmo.attr,
4418         &dev_attr_sess_tgt_reset_tmo.attr,
4419         &dev_attr_sess_ifacename.attr,
4420         &dev_attr_sess_initiatorname.attr,
4421         &dev_attr_sess_targetalias.attr,
4422         &dev_attr_sess_boot_root.attr,
4423         &dev_attr_sess_boot_nic.attr,
4424         &dev_attr_sess_boot_target.attr,
4425         &dev_attr_priv_sess_recovery_tmo.attr,
4426         &dev_attr_priv_sess_state.attr,
4427         &dev_attr_priv_sess_creator.attr,
4428         &dev_attr_sess_chap_out_idx.attr,
4429         &dev_attr_sess_chap_in_idx.attr,
4430         &dev_attr_priv_sess_target_id.attr,
4431         &dev_attr_sess_auto_snd_tgt_disable.attr,
4432         &dev_attr_sess_discovery_session.attr,
4433         &dev_attr_sess_portal_type.attr,
4434         &dev_attr_sess_chap_auth.attr,
4435         &dev_attr_sess_discovery_logout.attr,
4436         &dev_attr_sess_bidi_chap.attr,
4437         &dev_attr_sess_discovery_auth_optional.attr,
4438         &dev_attr_sess_def_time2wait.attr,
4439         &dev_attr_sess_def_time2retain.attr,
4440         &dev_attr_sess_isid.attr,
4441         &dev_attr_sess_tsid.attr,
4442         &dev_attr_sess_def_taskmgmt_tmo.attr,
4443         &dev_attr_sess_discovery_parent_idx.attr,
4444         &dev_attr_sess_discovery_parent_type.attr,
4445         NULL,
4446 };
4447
4448 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4449                                             struct attribute *attr, int i)
4450 {
4451         struct device *cdev = container_of(kobj, struct device, kobj);
4452         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4453         struct iscsi_transport *t = session->transport;
4454         int param;
4455
4456         if (attr == &dev_attr_sess_initial_r2t.attr)
4457                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4458         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4459                 param = ISCSI_PARAM_MAX_R2T;
4460         else if (attr == &dev_attr_sess_immediate_data.attr)
4461                 param = ISCSI_PARAM_IMM_DATA_EN;
4462         else if (attr == &dev_attr_sess_first_burst_len.attr)
4463                 param = ISCSI_PARAM_FIRST_BURST;
4464         else if (attr == &dev_attr_sess_max_burst_len.attr)
4465                 param = ISCSI_PARAM_MAX_BURST;
4466         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4467                 param = ISCSI_PARAM_PDU_INORDER_EN;
4468         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4469                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4470         else if (attr == &dev_attr_sess_erl.attr)
4471                 param = ISCSI_PARAM_ERL;
4472         else if (attr == &dev_attr_sess_targetname.attr)
4473                 param = ISCSI_PARAM_TARGET_NAME;
4474         else if (attr == &dev_attr_sess_tpgt.attr)
4475                 param = ISCSI_PARAM_TPGT;
4476         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4477                 param = ISCSI_PARAM_CHAP_IN_IDX;
4478         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4479                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4480         else if (attr == &dev_attr_sess_password.attr)
4481                 param = ISCSI_PARAM_USERNAME;
4482         else if (attr == &dev_attr_sess_password_in.attr)
4483                 param = ISCSI_PARAM_USERNAME_IN;
4484         else if (attr == &dev_attr_sess_username.attr)
4485                 param = ISCSI_PARAM_PASSWORD;
4486         else if (attr == &dev_attr_sess_username_in.attr)
4487                 param = ISCSI_PARAM_PASSWORD_IN;
4488         else if (attr == &dev_attr_sess_fast_abort.attr)
4489                 param = ISCSI_PARAM_FAST_ABORT;
4490         else if (attr == &dev_attr_sess_abort_tmo.attr)
4491                 param = ISCSI_PARAM_ABORT_TMO;
4492         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4493                 param = ISCSI_PARAM_LU_RESET_TMO;
4494         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4495                 param = ISCSI_PARAM_TGT_RESET_TMO;
4496         else if (attr == &dev_attr_sess_ifacename.attr)
4497                 param = ISCSI_PARAM_IFACE_NAME;
4498         else if (attr == &dev_attr_sess_initiatorname.attr)
4499                 param = ISCSI_PARAM_INITIATOR_NAME;
4500         else if (attr == &dev_attr_sess_targetalias.attr)
4501                 param = ISCSI_PARAM_TARGET_ALIAS;
4502         else if (attr == &dev_attr_sess_boot_root.attr)
4503                 param = ISCSI_PARAM_BOOT_ROOT;
4504         else if (attr == &dev_attr_sess_boot_nic.attr)
4505                 param = ISCSI_PARAM_BOOT_NIC;
4506         else if (attr == &dev_attr_sess_boot_target.attr)
4507                 param = ISCSI_PARAM_BOOT_TARGET;
4508         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4509                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4510         else if (attr == &dev_attr_sess_discovery_session.attr)
4511                 param = ISCSI_PARAM_DISCOVERY_SESS;
4512         else if (attr == &dev_attr_sess_portal_type.attr)
4513                 param = ISCSI_PARAM_PORTAL_TYPE;
4514         else if (attr == &dev_attr_sess_chap_auth.attr)
4515                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4516         else if (attr == &dev_attr_sess_discovery_logout.attr)
4517                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4518         else if (attr == &dev_attr_sess_bidi_chap.attr)
4519                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4520         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4521                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4522         else if (attr == &dev_attr_sess_def_time2wait.attr)
4523                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4524         else if (attr == &dev_attr_sess_def_time2retain.attr)
4525                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4526         else if (attr == &dev_attr_sess_isid.attr)
4527                 param = ISCSI_PARAM_ISID;
4528         else if (attr == &dev_attr_sess_tsid.attr)
4529                 param = ISCSI_PARAM_TSID;
4530         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4531                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4532         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4533                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4534         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4535                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4536         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4537                 return S_IRUGO | S_IWUSR;
4538         else if (attr == &dev_attr_priv_sess_state.attr)
4539                 return S_IRUGO;
4540         else if (attr == &dev_attr_priv_sess_creator.attr)
4541                 return S_IRUGO;
4542         else if (attr == &dev_attr_priv_sess_target_id.attr)
4543                 return S_IRUGO;
4544         else {
4545                 WARN_ONCE(1, "Invalid session attr");
4546                 return 0;
4547         }
4548
4549         return t->attr_is_visible(ISCSI_PARAM, param);
4550 }
4551
4552 static struct attribute_group iscsi_session_group = {
4553         .attrs = iscsi_session_attrs,
4554         .is_visible = iscsi_session_attr_is_visible,
4555 };
4556
4557 /*
4558  * iSCSI host attrs
4559  */
4560 #define iscsi_host_attr_show(param)                                     \
4561 static ssize_t                                                          \
4562 show_host_param_##param(struct device *dev,                             \
4563                         struct device_attribute *attr, char *buf)       \
4564 {                                                                       \
4565         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4566         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4567         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4568 }
4569
4570 #define iscsi_host_attr(field, param)                                   \
4571         iscsi_host_attr_show(param)                                     \
4572 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4573                         NULL);
4574
4575 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4576 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4577 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4578 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4579 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4580 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4581
4582 static struct attribute *iscsi_host_attrs[] = {
4583         &dev_attr_host_netdev.attr,
4584         &dev_attr_host_hwaddress.attr,
4585         &dev_attr_host_ipaddress.attr,
4586         &dev_attr_host_initiatorname.attr,
4587         &dev_attr_host_port_state.attr,
4588         &dev_attr_host_port_speed.attr,
4589         NULL,
4590 };
4591
4592 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4593                                          struct attribute *attr, int i)
4594 {
4595         struct device *cdev = container_of(kobj, struct device, kobj);
4596         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4597         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4598         int param;
4599
4600         if (attr == &dev_attr_host_netdev.attr)
4601                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4602         else if (attr == &dev_attr_host_hwaddress.attr)
4603                 param = ISCSI_HOST_PARAM_HWADDRESS;
4604         else if (attr == &dev_attr_host_ipaddress.attr)
4605                 param = ISCSI_HOST_PARAM_IPADDRESS;
4606         else if (attr == &dev_attr_host_initiatorname.attr)
4607                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4608         else if (attr == &dev_attr_host_port_state.attr)
4609                 param = ISCSI_HOST_PARAM_PORT_STATE;
4610         else if (attr == &dev_attr_host_port_speed.attr)
4611                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4612         else {
4613                 WARN_ONCE(1, "Invalid host attr");
4614                 return 0;
4615         }
4616
4617         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4618 }
4619
4620 static struct attribute_group iscsi_host_group = {
4621         .attrs = iscsi_host_attrs,
4622         .is_visible = iscsi_host_attr_is_visible,
4623 };
4624
4625 /* convert iscsi_port_speed values to ascii string name */
4626 static const struct {
4627         enum iscsi_port_speed   value;
4628         char                    *name;
4629 } iscsi_port_speed_names[] = {
4630         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4631         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4632         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4633         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4634         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4635         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4636         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4637 };
4638
4639 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4640 {
4641         int i;
4642         char *speed = "Unknown!";
4643         struct iscsi_cls_host *ihost = shost->shost_data;
4644         uint32_t port_speed = ihost->port_speed;
4645
4646         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4647                 if (iscsi_port_speed_names[i].value & port_speed) {
4648                         speed = iscsi_port_speed_names[i].name;
4649                         break;
4650                 }
4651         }
4652         return speed;
4653 }
4654 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4655
4656 /* convert iscsi_port_state values to ascii string name */
4657 static const struct {
4658         enum iscsi_port_state   value;
4659         char                    *name;
4660 } iscsi_port_state_names[] = {
4661         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4662         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4663 };
4664
4665 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4666 {
4667         int i;
4668         char *state = "Unknown!";
4669         struct iscsi_cls_host *ihost = shost->shost_data;
4670         uint32_t port_state = ihost->port_state;
4671
4672         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4673                 if (iscsi_port_state_names[i].value & port_state) {
4674                         state = iscsi_port_state_names[i].name;
4675                         break;
4676                 }
4677         }
4678         return state;
4679 }
4680 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4681
4682 static int iscsi_session_match(struct attribute_container *cont,
4683                            struct device *dev)
4684 {
4685         struct iscsi_cls_session *session;
4686         struct Scsi_Host *shost;
4687         struct iscsi_internal *priv;
4688
4689         if (!iscsi_is_session_dev(dev))
4690                 return 0;
4691
4692         session = iscsi_dev_to_session(dev);
4693         shost = iscsi_session_to_shost(session);
4694         if (!shost->transportt)
4695                 return 0;
4696
4697         priv = to_iscsi_internal(shost->transportt);
4698         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4699                 return 0;
4700
4701         return &priv->session_cont.ac == cont;
4702 }
4703
4704 static int iscsi_conn_match(struct attribute_container *cont,
4705                            struct device *dev)
4706 {
4707         struct iscsi_cls_session *session;
4708         struct iscsi_cls_conn *conn;
4709         struct Scsi_Host *shost;
4710         struct iscsi_internal *priv;
4711
4712         if (!iscsi_is_conn_dev(dev))
4713                 return 0;
4714
4715         conn = iscsi_dev_to_conn(dev);
4716         session = iscsi_dev_to_session(conn->dev.parent);
4717         shost = iscsi_session_to_shost(session);
4718
4719         if (!shost->transportt)
4720                 return 0;
4721
4722         priv = to_iscsi_internal(shost->transportt);
4723         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4724                 return 0;
4725
4726         return &priv->conn_cont.ac == cont;
4727 }
4728
4729 static int iscsi_host_match(struct attribute_container *cont,
4730                             struct device *dev)
4731 {
4732         struct Scsi_Host *shost;
4733         struct iscsi_internal *priv;
4734
4735         if (!scsi_is_host_device(dev))
4736                 return 0;
4737
4738         shost = dev_to_shost(dev);
4739         if (!shost->transportt  ||
4740             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4741                 return 0;
4742
4743         priv = to_iscsi_internal(shost->transportt);
4744         return &priv->t.host_attrs.ac == cont;
4745 }
4746
4747 struct scsi_transport_template *
4748 iscsi_register_transport(struct iscsi_transport *tt)
4749 {
4750         struct iscsi_internal *priv;
4751         unsigned long flags;
4752         int err;
4753
4754         BUG_ON(!tt);
4755         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4756
4757         priv = iscsi_if_transport_lookup(tt);
4758         if (priv)
4759                 return NULL;
4760
4761         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4762         if (!priv)
4763                 return NULL;
4764         INIT_LIST_HEAD(&priv->list);
4765         priv->iscsi_transport = tt;
4766         priv->t.user_scan = iscsi_user_scan;
4767         priv->t.create_work_queue = 1;
4768
4769         priv->dev.class = &iscsi_transport_class;
4770         dev_set_name(&priv->dev, "%s", tt->name);
4771         err = device_register(&priv->dev);
4772         if (err)
4773                 goto free_priv;
4774
4775         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4776         if (err)
4777                 goto unregister_dev;
4778
4779         /* host parameters */
4780         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4781         priv->t.host_attrs.ac.match = iscsi_host_match;
4782         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4783         priv->t.host_size = sizeof(struct iscsi_cls_host);
4784         transport_container_register(&priv->t.host_attrs);
4785
4786         /* connection parameters */
4787         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4788         priv->conn_cont.ac.match = iscsi_conn_match;
4789         priv->conn_cont.ac.grp = &iscsi_conn_group;
4790         transport_container_register(&priv->conn_cont);
4791
4792         /* session parameters */
4793         priv->session_cont.ac.class = &iscsi_session_class.class;
4794         priv->session_cont.ac.match = iscsi_session_match;
4795         priv->session_cont.ac.grp = &iscsi_session_group;
4796         transport_container_register(&priv->session_cont);
4797
4798         spin_lock_irqsave(&iscsi_transport_lock, flags);
4799         list_add(&priv->list, &iscsi_transports);
4800         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4801
4802         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4803         return &priv->t;
4804
4805 unregister_dev:
4806         device_unregister(&priv->dev);
4807         return NULL;
4808 free_priv:
4809         kfree(priv);
4810         return NULL;
4811 }
4812 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4813
4814 int iscsi_unregister_transport(struct iscsi_transport *tt)
4815 {
4816         struct iscsi_internal *priv;
4817         unsigned long flags;
4818
4819         BUG_ON(!tt);
4820
4821         mutex_lock(&rx_queue_mutex);
4822
4823         priv = iscsi_if_transport_lookup(tt);
4824         BUG_ON (!priv);
4825
4826         spin_lock_irqsave(&iscsi_transport_lock, flags);
4827         list_del(&priv->list);
4828         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4829
4830         transport_container_unregister(&priv->conn_cont);
4831         transport_container_unregister(&priv->session_cont);
4832         transport_container_unregister(&priv->t.host_attrs);
4833
4834         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4835         device_unregister(&priv->dev);
4836         mutex_unlock(&rx_queue_mutex);
4837
4838         return 0;
4839 }
4840 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4841
4842 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4843                      struct device *dev, const char *fmt, ...)
4844 {
4845         struct va_format vaf;
4846         va_list args;
4847
4848         va_start(args, fmt);
4849         vaf.fmt = fmt;
4850         vaf.va = &args;
4851         trace(dev, &vaf);
4852         va_end(args);
4853 }
4854 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4855
4856 static __init int iscsi_transport_init(void)
4857 {
4858         int err;
4859         struct netlink_kernel_cfg cfg = {
4860                 .groups = 1,
4861                 .input  = iscsi_if_rx,
4862         };
4863         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4864                 ISCSI_TRANSPORT_VERSION);
4865
4866         atomic_set(&iscsi_session_nr, 0);
4867
4868         err = class_register(&iscsi_transport_class);
4869         if (err)
4870                 return err;
4871
4872         err = class_register(&iscsi_endpoint_class);
4873         if (err)
4874                 goto unregister_transport_class;
4875
4876         err = class_register(&iscsi_iface_class);
4877         if (err)
4878                 goto unregister_endpoint_class;
4879
4880         err = transport_class_register(&iscsi_host_class);
4881         if (err)
4882                 goto unregister_iface_class;
4883
4884         err = transport_class_register(&iscsi_connection_class);
4885         if (err)
4886                 goto unregister_host_class;
4887
4888         err = transport_class_register(&iscsi_session_class);
4889         if (err)
4890                 goto unregister_conn_class;
4891
4892         err = bus_register(&iscsi_flashnode_bus);
4893         if (err)
4894                 goto unregister_session_class;
4895
4896         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4897         if (!nls) {
4898                 err = -ENOBUFS;
4899                 goto unregister_flashnode_bus;
4900         }
4901
4902         iscsi_eh_timer_workq = alloc_workqueue("%s",
4903                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4904                         1, "iscsi_eh");
4905         if (!iscsi_eh_timer_workq) {
4906                 err = -ENOMEM;
4907                 goto release_nls;
4908         }
4909
4910         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4911                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4912                         "iscsi_conn_cleanup");
4913         if (!iscsi_conn_cleanup_workq) {
4914                 err = -ENOMEM;
4915                 goto destroy_wq;
4916         }
4917
4918         return 0;
4919
4920 destroy_wq:
4921         destroy_workqueue(iscsi_eh_timer_workq);
4922 release_nls:
4923         netlink_kernel_release(nls);
4924 unregister_flashnode_bus:
4925         bus_unregister(&iscsi_flashnode_bus);
4926 unregister_session_class:
4927         transport_class_unregister(&iscsi_session_class);
4928 unregister_conn_class:
4929         transport_class_unregister(&iscsi_connection_class);
4930 unregister_host_class:
4931         transport_class_unregister(&iscsi_host_class);
4932 unregister_iface_class:
4933         class_unregister(&iscsi_iface_class);
4934 unregister_endpoint_class:
4935         class_unregister(&iscsi_endpoint_class);
4936 unregister_transport_class:
4937         class_unregister(&iscsi_transport_class);
4938         return err;
4939 }
4940
4941 static void __exit iscsi_transport_exit(void)
4942 {
4943         destroy_workqueue(iscsi_conn_cleanup_workq);
4944         destroy_workqueue(iscsi_eh_timer_workq);
4945         netlink_kernel_release(nls);
4946         bus_unregister(&iscsi_flashnode_bus);
4947         transport_class_unregister(&iscsi_connection_class);
4948         transport_class_unregister(&iscsi_session_class);
4949         transport_class_unregister(&iscsi_host_class);
4950         class_unregister(&iscsi_endpoint_class);
4951         class_unregister(&iscsi_iface_class);
4952         class_unregister(&iscsi_transport_class);
4953 }
4954
4955 module_init(iscsi_transport_init);
4956 module_exit(iscsi_transport_exit);
4957
4958 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4959               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4960               "Alex Aizman <itn780@yahoo.com>");
4961 MODULE_DESCRIPTION("iSCSI Transport Interface");
4962 MODULE_LICENSE("GPL");
4963 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4964 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);