drivers/scsi/scsi_transport_iscsi.c

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