drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_fc.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <linux/netlink.h>
  35 #include <net/netlink.h>
  36 #include <scsi/scsi_netlink_fc.h>
  37 #include "scsi_priv.h"
  38
  39 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  40
  41 /*
  42  * Redefine so that we can have same named attributes in the
  43  * sdev/starget/host objects.
  44  */
  45 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  46 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  47         __ATTR(_name,_mode,_show,_store)
  48
  49 #define fc_enum_name_search(title, table_type, table)                   \
  50 static const char *get_fc_##title##_name(enum table_type table_key)     \
  51 {                                                                       \
  52         int i;                                                          \
  53         char *name = NULL;                                              \
  54                                                                         \
  55         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  56                 if (table[i].value == table_key) {                      \
  57                         name = table[i].name;                           \
  58                         break;                                          \
  59                 }                                                       \
  60         }                                                               \
  61         return name;                                                    \
  62 }
  63
  64 #define fc_enum_name_match(title, table_type, table)                    \
  65 static int get_fc_##title##_match(const char *table_key,                \
  66                 enum table_type *value)                                 \
  67 {                                                                       \
  68         int i;                                                          \
  69                                                                         \
  70         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  71                 if (strncmp(table_key, table[i].name,                   \
  72                                 table[i].matchlen) == 0) {              \
  73                         *value = table[i].value;                        \
  74                         return 0; /* success */                         \
  75                 }                                                       \
  76         }                                                               \
  77         return 1; /* failure */                                         \
  78 }
  79
  80
  81 /* Convert fc_port_type values to ascii string name */
  82 static struct {
  83         enum fc_port_type       value;
  84         char                    *name;
  85 } fc_port_type_names[] = {
  86         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  87         { FC_PORTTYPE_OTHER,            "Other" },
  88         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  89         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  90         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  91         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  92         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  93 };
  94 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  95 #define FC_PORTTYPE_MAX_NAMELEN         50
  96
  97
  98 /* Convert fc_host_event_code values to ascii string name */
  99 static const struct {
 100         enum fc_host_event_code         value;
 101         char                            *name;
 102 } fc_host_event_code_names[] = {
 103         { FCH_EVT_LIP,                  "lip" },
 104         { FCH_EVT_LINKUP,               "link_up" },
 105         { FCH_EVT_LINKDOWN,             "link_down" },
 106         { FCH_EVT_LIPRESET,             "lip_reset" },
 107         { FCH_EVT_RSCN,                 "rscn" },
 108         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 109         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 110         { FCH_EVT_PORT_ONLINE,          "port_online" },
 111         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 112         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 113         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 114         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 115 };
 116 fc_enum_name_search(host_event_code, fc_host_event_code,
 117                 fc_host_event_code_names)
 118 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 119
 120
 121 /* Convert fc_port_state values to ascii string name */
 122 static struct {
 123         enum fc_port_state      value;
 124         char                    *name;
 125 } fc_port_state_names[] = {
 126         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 127         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 128         { FC_PORTSTATE_ONLINE,          "Online" },
 129         { FC_PORTSTATE_OFFLINE,         "Offline" },
 130         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 131         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 132         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 133         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 134         { FC_PORTSTATE_ERROR,           "Error" },
 135         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 136         { FC_PORTSTATE_DELETED,         "Deleted" },
 137 };
 138 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 139 #define FC_PORTSTATE_MAX_NAMELEN        20
 140
 141
 142 /* Convert fc_tgtid_binding_type values to ascii string name */
 143 static const struct {
 144         enum fc_tgtid_binding_type      value;
 145         char                            *name;
 146         int                             matchlen;
 147 } fc_tgtid_binding_type_names[] = {
 148         { FC_TGTID_BIND_NONE, "none", 4 },
 149         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 150         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 151         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 152 };
 153 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 154                 fc_tgtid_binding_type_names)
 155 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 156                 fc_tgtid_binding_type_names)
 157 #define FC_BINDTYPE_MAX_NAMELEN 30
 158
 159
 160 #define fc_bitfield_name_search(title, table)                   \
 161 static ssize_t                                                  \
 162 get_fc_##title##_names(u32 table_key, char *buf)                \
 163 {                                                               \
 164         char *prefix = "";                                      \
 165         ssize_t len = 0;                                        \
 166         int i;                                                  \
 167                                                                 \
 168         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 169                 if (table[i].value & table_key) {               \
 170                         len += sprintf(buf + len, "%s%s",       \
 171                                 prefix, table[i].name);         \
 172                         prefix = ", ";                          \
 173                 }                                               \
 174         }                                                       \
 175         len += sprintf(buf + len, "\n");                        \
 176         return len;                                             \
 177 }
 178
 179
 180 /* Convert FC_COS bit values to ascii string name */
 181 static const struct {
 182         u32                     value;
 183         char                    *name;
 184 } fc_cos_names[] = {
 185         { FC_COS_CLASS1,        "Class 1" },
 186         { FC_COS_CLASS2,        "Class 2" },
 187         { FC_COS_CLASS3,        "Class 3" },
 188         { FC_COS_CLASS4,        "Class 4" },
 189         { FC_COS_CLASS6,        "Class 6" },
 190 };
 191 fc_bitfield_name_search(cos, fc_cos_names)
 192
 193
 194 /* Convert FC_PORTSPEED bit values to ascii string name */
 195 static const struct {
 196         u32                     value;
 197         char                    *name;
 198 } fc_port_speed_names[] = {
 199         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 200         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 201         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 202         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 203         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 204 };
 205 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 206
 207
 208 static int
 209 show_fc_fc4s (char *buf, u8 *fc4_list)
 210 {
 211         int i, len=0;
 212
 213         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 214                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 215         len += sprintf(buf + len, "\n");
 216         return len;
 217 }
 218
 219
 220 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 221 static const struct {
 222         u32                     value;
 223         char                    *name;
 224 } fc_remote_port_role_names[] = {
 225         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 226         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 227         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 228 };
 229 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 230
 231 /*
 232  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 233  */
 234 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 235 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 236 #define FC_FPORT_PORTID                 0x00000e
 237 #define FC_FABCTLR_PORTID               0x00000d
 238 #define FC_DIRSRVR_PORTID               0x00000c
 239 #define FC_TIMESRVR_PORTID              0x00000b
 240 #define FC_MGMTSRVR_PORTID              0x00000a
 241
 242
 243 static void fc_timeout_deleted_rport(struct work_struct *work);
 244 static void fc_timeout_fail_rport_io(struct work_struct *work);
 245 static void fc_scsi_scan_rport(struct work_struct *work);
 246
 247 /*
 248  * Attribute counts pre object type...
 249  * Increase these values if you add attributes
 250  */
 251 #define FC_STARGET_NUM_ATTRS    3
 252 #define FC_RPORT_NUM_ATTRS      10
 253 #define FC_HOST_NUM_ATTRS       17
 254
 255 struct fc_internal {
 256         struct scsi_transport_template t;
 257         struct fc_function_template *f;
 258
 259         /*
 260          * For attributes : each object has :
 261          *   An array of the actual attributes structures
 262          *   An array of null-terminated pointers to the attribute
 263          *     structures - used for mid-layer interaction.
 264          *
 265          * The attribute containers for the starget and host are are
 266          * part of the midlayer. As the remote port is specific to the
 267          * fc transport, we must provide the attribute container.
 268          */
 269         struct class_device_attribute private_starget_attrs[
 270                                                         FC_STARGET_NUM_ATTRS];
 271         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 272
 273         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 274         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 275
 276         struct transport_container rport_attr_cont;
 277         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 278         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 279 };
 280
 281 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 282
 283 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 284                            struct class_device *cdev)
 285 {
 286         struct scsi_target *starget = to_scsi_target(dev);
 287         struct fc_rport *rport = starget_to_rport(starget);
 288
 289         /*
 290          * if parent is remote port, use values from remote port.
 291          * Otherwise, this host uses the fc_transport, but not the
 292          * remote port interface. As such, initialize to known non-values.
 293          */
 294         if (rport) {
 295                 fc_starget_node_name(starget) = rport->node_name;
 296                 fc_starget_port_name(starget) = rport->port_name;
 297                 fc_starget_port_id(starget) = rport->port_id;
 298         } else {
 299                 fc_starget_node_name(starget) = -1;
 300                 fc_starget_port_name(starget) = -1;
 301                 fc_starget_port_id(starget) = -1;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 308                                "fc_transport",
 309                                fc_target_setup,
 310                                NULL,
 311                                NULL);
 312
 313 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 314                          struct class_device *cdev)
 315 {
 316         struct Scsi_Host *shost = dev_to_shost(dev);
 317         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 318
 319         /*
 320          * Set default values easily detected by the midlayer as
 321          * failure cases.  The scsi lldd is responsible for initializing
 322          * all transport attributes to valid values per host.
 323          */
 324         fc_host->node_name = -1;
 325         fc_host->port_name = -1;
 326         fc_host->permanent_port_name = -1;
 327         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 328         memset(fc_host->supported_fc4s, 0,
 329                 sizeof(fc_host->supported_fc4s));
 330         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 331         fc_host->maxframe_size = -1;
 332         memset(fc_host->serial_number, 0,
 333                 sizeof(fc_host->serial_number));
 334
 335         fc_host->port_id = -1;
 336         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 337         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 338         memset(fc_host->active_fc4s, 0,
 339                 sizeof(fc_host->active_fc4s));
 340         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 341         fc_host->fabric_name = -1;
 342         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 343         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 344
 345         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 346
 347         INIT_LIST_HEAD(&fc_host->rports);
 348         INIT_LIST_HEAD(&fc_host->rport_bindings);
 349         fc_host->next_rport_number = 0;
 350         fc_host->next_target_id = 0;
 351
 352         snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
 353                 shost->host_no);
 354         fc_host->work_q = create_singlethread_workqueue(
 355                                         fc_host->work_q_name);
 356         if (!fc_host->work_q)
 357                 return -ENOMEM;
 358
 359         snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
 360                 shost->host_no);
 361         fc_host->devloss_work_q = create_singlethread_workqueue(
 362                                         fc_host->devloss_work_q_name);
 363         if (!fc_host->devloss_work_q) {
 364                 destroy_workqueue(fc_host->work_q);
 365                 fc_host->work_q = NULL;
 366                 return -ENOMEM;
 367         }
 368
 369         return 0;
 370 }
 371
 372 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 373                                "fc_host",
 374                                fc_host_setup,
 375                                NULL,
 376                                NULL);
 377
 378 /*
 379  * Setup and Remove actions for remote ports are handled
 380  * in the service functions below.
 381  */
 382 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 383                                "fc_remote_ports",
 384                                NULL,
 385                                NULL,
 386                                NULL);
 387
 388 /*
 389  * Module Parameters
 390  */
 391
 392 /*
 393  * dev_loss_tmo: the default number of seconds that the FC transport
 394  *   should insulate the loss of a remote port.
 395  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 396  */
 397 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 398
 399 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 400 MODULE_PARM_DESC(dev_loss_tmo,
 401                  "Maximum number of seconds that the FC transport should"
 402                  " insulate the loss of a remote port. Once this value is"
 403                  " exceeded, the scsi target is removed. Value should be"
 404                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 405
 406 /**
 407  * Netlink Infrastructure
 408  **/
 409
 410 static atomic_t fc_event_seq;
 411
 412 /**
 413  * fc_get_event_number - Obtain the next sequential FC event number
 414  *
 415  * Notes:
 416  *   We could have inline'd this, but it would have required fc_event_seq to
 417  *   be exposed. For now, live with the subroutine call.
 418  *   Atomic used to avoid lock/unlock...
 419  **/
 420 u32
 421 fc_get_event_number(void)
 422 {
 423         return atomic_add_return(1, &fc_event_seq);
 424 }
 425 EXPORT_SYMBOL(fc_get_event_number);
 426
 427
 428 /**
 429  * fc_host_post_event - called to post an even on an fc_host.
 430  *
 431  * @shost:              host the event occurred on
 432  * @event_number:       fc event number obtained from get_fc_event_number()
 433  * @event_code:         fc_host event being posted
 434  * @event_data:         32bits of data for the event being posted
 435  *
 436  * Notes:
 437  *      This routine assumes no locks are held on entry.
 438  **/
 439 void
 440 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 441                 enum fc_host_event_code event_code, u32 event_data)
 442 {
 443         struct sk_buff *skb;
 444         struct nlmsghdr *nlh;
 445         struct fc_nl_event *event;
 446         const char *name;
 447         u32 len, skblen;
 448         int err;
 449
 450         if (!scsi_nl_sock) {
 451                 err = -ENOENT;
 452                 goto send_fail;
 453         }
 454
 455         len = FC_NL_MSGALIGN(sizeof(*event));
 456         skblen = NLMSG_SPACE(len);
 457
 458         skb = alloc_skb(skblen, GFP_KERNEL);
 459         if (!skb) {
 460                 err = -ENOBUFS;
 461                 goto send_fail;
 462         }
 463
 464         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 465                                 skblen - sizeof(*nlh), 0);
 466         if (!nlh) {
 467                 err = -ENOBUFS;
 468                 goto send_fail_skb;
 469         }
 470         event = NLMSG_DATA(nlh);
 471
 472         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 473                                 FC_NL_ASYNC_EVENT, len);
 474         event->seconds = get_seconds();
 475         event->vendor_id = 0;
 476         event->host_no = shost->host_no;
 477         event->event_datalen = sizeof(u32);     /* bytes */
 478         event->event_num = event_number;
 479         event->event_code = event_code;
 480         event->event_data = event_data;
 481
 482         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 483                               GFP_KERNEL);
 484         if (err && (err != -ESRCH))     /* filter no recipient errors */
 485                 /* nlmsg_multicast already kfree_skb'd */
 486                 goto send_fail;
 487
 488         return;
 489
 490 send_fail_skb:
 491         kfree_skb(skb);
 492 send_fail:
 493         name = get_fc_host_event_code_name(event_code);
 494         printk(KERN_WARNING
 495                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 496                 __FUNCTION__, shost->host_no,
 497                 (name) ? name : "<unknown>", event_data, err);
 498         return;
 499 }
 500 EXPORT_SYMBOL(fc_host_post_event);
 501
 502
 503 /**
 504  * fc_host_post_vendor_event - called to post a vendor unique event on
 505  *                             a fc_host
 506  *
 507  * @shost:              host the event occurred on
 508  * @event_number:       fc event number obtained from get_fc_event_number()
 509  * @data_len:           amount, in bytes, of vendor unique data
 510  * @data_buf:           pointer to vendor unique data
 511  *
 512  * Notes:
 513  *      This routine assumes no locks are held on entry.
 514  **/
 515 void
 516 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 517                 u32 data_len, char * data_buf, u64 vendor_id)
 518 {
 519         struct sk_buff *skb;
 520         struct nlmsghdr *nlh;
 521         struct fc_nl_event *event;
 522         u32 len, skblen;
 523         int err;
 524
 525         if (!scsi_nl_sock) {
 526                 err = -ENOENT;
 527                 goto send_vendor_fail;
 528         }
 529
 530         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 531         skblen = NLMSG_SPACE(len);
 532
 533         skb = alloc_skb(skblen, GFP_KERNEL);
 534         if (!skb) {
 535                 err = -ENOBUFS;
 536                 goto send_vendor_fail;
 537         }
 538
 539         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 540                                 skblen - sizeof(*nlh), 0);
 541         if (!nlh) {
 542                 err = -ENOBUFS;
 543                 goto send_vendor_fail_skb;
 544         }
 545         event = NLMSG_DATA(nlh);
 546
 547         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 548                                 FC_NL_ASYNC_EVENT, len);
 549         event->seconds = get_seconds();
 550         event->vendor_id = vendor_id;
 551         event->host_no = shost->host_no;
 552         event->event_datalen = data_len;        /* bytes */
 553         event->event_num = event_number;
 554         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 555         memcpy(&event->event_data, data_buf, data_len);
 556
 557         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 558                               GFP_KERNEL);
 559         if (err && (err != -ESRCH))     /* filter no recipient errors */
 560                 /* nlmsg_multicast already kfree_skb'd */
 561                 goto send_vendor_fail;
 562
 563         return;
 564
 565 send_vendor_fail_skb:
 566         kfree_skb(skb);
 567 send_vendor_fail:
 568         printk(KERN_WARNING
 569                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 570                 __FUNCTION__, shost->host_no, err);
 571         return;
 572 }
 573 EXPORT_SYMBOL(fc_host_post_vendor_event);
 574
 575
 576
 577 static __init int fc_transport_init(void)
 578 {
 579         int error;
 580
 581         atomic_set(&fc_event_seq, 0);
 582
 583         error = transport_class_register(&fc_host_class);
 584         if (error)
 585                 return error;
 586         error = transport_class_register(&fc_rport_class);
 587         if (error)
 588                 return error;
 589         return transport_class_register(&fc_transport_class);
 590 }
 591
 592 static void __exit fc_transport_exit(void)
 593 {
 594         transport_class_unregister(&fc_transport_class);
 595         transport_class_unregister(&fc_rport_class);
 596         transport_class_unregister(&fc_host_class);
 597 }
 598
 599 /*
 600  * FC Remote Port Attribute Management
 601  */
 602
 603 #define fc_rport_show_function(field, format_string, sz, cast)          \
 604 static ssize_t                                                          \
 605 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 606 {                                                                       \
 607         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 608         struct Scsi_Host *shost = rport_to_shost(rport);                \
 609         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 610         if ((i->f->get_rport_##field) &&                                \
 611             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 612               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 613               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 614                 i->f->get_rport_##field(rport);                         \
 615         return snprintf(buf, sz, format_string, cast rport->field);     \
 616 }
 617
 618 #define fc_rport_store_function(field)                                  \
 619 static ssize_t                                                          \
 620 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 621                            size_t count)                                \
 622 {                                                                       \
 623         int val;                                                        \
 624         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 625         struct Scsi_Host *shost = rport_to_shost(rport);                \
 626         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 627         char *cp;                                                       \
 628         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 629             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 630             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 631                 return -EBUSY;                                          \
 632         val = simple_strtoul(buf, &cp, 0);                              \
 633         if (*cp && (*cp != '\n'))                                       \
 634                 return -EINVAL;                                         \
 635         i->f->set_rport_##field(rport, val);                            \
 636         return count;                                                   \
 637 }
 638
 639 #define fc_rport_rd_attr(field, format_string, sz)                      \
 640         fc_rport_show_function(field, format_string, sz, )              \
 641 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 642                          show_fc_rport_##field, NULL)
 643
 644 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 645         fc_rport_show_function(field, format_string, sz, (cast))        \
 646 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 647                           show_fc_rport_##field, NULL)
 648
 649 #define fc_rport_rw_attr(field, format_string, sz)                      \
 650         fc_rport_show_function(field, format_string, sz, )              \
 651         fc_rport_store_function(field)                                  \
 652 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 653                         show_fc_rport_##field,                          \
 654                         store_fc_rport_##field)
 655
 656
 657 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 658 static ssize_t                                                          \
 659 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 660 {                                                                       \
 661         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 662         return snprintf(buf, sz, format_string, cast rport->field);     \
 663 }
 664
 665 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 666         fc_private_rport_show_function(field, format_string, sz, )      \
 667 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 668                          show_fc_rport_##field, NULL)
 669
 670 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 671         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 672 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 673                           show_fc_rport_##field, NULL)
 674
 675
 676 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 677 static ssize_t                                                          \
 678 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 679 {                                                                       \
 680         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 681         const char *name;                                               \
 682         name = get_fc_##title##_name(rport->title);                     \
 683         if (!name)                                                      \
 684                 return -EINVAL;                                         \
 685         return snprintf(buf, maxlen, "%s\n", name);                     \
 686 }                                                                       \
 687 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 688                         show_fc_rport_##title, NULL)
 689
 690
 691 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 692         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 693         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 694         i->private_rport_attrs[count].store = NULL;                     \
 695         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 696         if (i->f->show_rport_##field)                                   \
 697                 count++
 698
 699 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 700         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 701         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 702         i->private_rport_attrs[count].store = NULL;                     \
 703         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 704         count++
 705
 706 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 707         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 708         if (!i->f->set_rport_##field) {                                 \
 709                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 710                 i->private_rport_attrs[count].store = NULL;             \
 711         }                                                               \
 712         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 713         if (i->f->show_rport_##field)                                   \
 714                 count++
 715
 716 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 717 {                                                                       \
 718         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 719         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 720         count++;                                                        \
 721 }
 722
 723
 724 /* The FC Transport Remote Port Attributes: */
 725
 726 /* Fixed Remote Port Attributes */
 727
 728 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 729
 730 static ssize_t
 731 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 732 {
 733         struct fc_rport *rport = transport_class_to_rport(cdev);
 734         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 735                 return snprintf(buf, 20, "unspecified\n");
 736         return get_fc_cos_names(rport->supported_classes, buf);
 737 }
 738 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 739                 show_fc_rport_supported_classes, NULL);
 740
 741 /* Dynamic Remote Port Attributes */
 742
 743 /*
 744  * dev_loss_tmo attribute
 745  */
 746 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 747 static ssize_t
 748 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
 749                            size_t count)
 750 {
 751         int val;
 752         struct fc_rport *rport = transport_class_to_rport(cdev);
 753         struct Scsi_Host *shost = rport_to_shost(rport);
 754         struct fc_internal *i = to_fc_internal(shost->transportt);
 755         char *cp;
 756         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 757             (rport->port_state == FC_PORTSTATE_DELETED) ||
 758             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 759                 return -EBUSY;
 760         val = simple_strtoul(buf, &cp, 0);
 761         if ((*cp && (*cp != '\n')) ||
 762             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 763                 return -EINVAL;
 764         i->f->set_rport_dev_loss_tmo(rport, val);
 765         return count;
 766 }
 767 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 768                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 769
 770
 771 /* Private Remote Port Attributes */
 772
 773 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 774 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 775 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 776
 777 static ssize_t
 778 show_fc_rport_roles (struct class_device *cdev, char *buf)
 779 {
 780         struct fc_rport *rport = transport_class_to_rport(cdev);
 781
 782         /* identify any roles that are port_id specific */
 783         if ((rport->port_id != -1) &&
 784             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 785                                         FC_WELLKNOWN_PORTID_MASK) {
 786                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 787                 case FC_FPORT_PORTID:
 788                         return snprintf(buf, 30, "Fabric Port\n");
 789                 case FC_FABCTLR_PORTID:
 790                         return snprintf(buf, 30, "Fabric Controller\n");
 791                 case FC_DIRSRVR_PORTID:
 792                         return snprintf(buf, 30, "Directory Server\n");
 793                 case FC_TIMESRVR_PORTID:
 794                         return snprintf(buf, 30, "Time Server\n");
 795                 case FC_MGMTSRVR_PORTID:
 796                         return snprintf(buf, 30, "Management Server\n");
 797                 default:
 798                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 799                 }
 800         } else {
 801                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 802                         return snprintf(buf, 20, "unknown\n");
 803                 return get_fc_remote_port_roles_names(rport->roles, buf);
 804         }
 805 }
 806 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 807                 show_fc_rport_roles, NULL);
 808
 809 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 810 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 811
 812 /*
 813  * fast_io_fail_tmo attribute
 814  */
 815 static ssize_t
 816 show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
 817 {
 818         struct fc_rport *rport = transport_class_to_rport(cdev);
 819
 820         if (rport->fast_io_fail_tmo == -1)
 821                 return snprintf(buf, 5, "off\n");
 822         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 823 }
 824
 825 static ssize_t
 826 store_fc_rport_fast_io_fail_tmo(struct class_device *cdev, const char *buf,
 827                            size_t count)
 828 {
 829         int val;
 830         char *cp;
 831         struct fc_rport *rport = transport_class_to_rport(cdev);
 832
 833         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 834             (rport->port_state == FC_PORTSTATE_DELETED) ||
 835             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 836                 return -EBUSY;
 837         if (strncmp(buf, "off", 3) == 0)
 838                 rport->fast_io_fail_tmo = -1;
 839         else {
 840                 val = simple_strtoul(buf, &cp, 0);
 841                 if ((*cp && (*cp != '\n')) ||
 842                     (val < 0) || (val >= rport->dev_loss_tmo))
 843                         return -EINVAL;
 844                 rport->fast_io_fail_tmo = val;
 845         }
 846         return count;
 847 }
 848 static FC_CLASS_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 849         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 850
 851
 852 /*
 853  * FC SCSI Target Attribute Management
 854  */
 855
 856 /*
 857  * Note: in the target show function we recognize when the remote
 858  *  port is in the heirarchy and do not allow the driver to get
 859  *  involved in sysfs functions. The driver only gets involved if
 860  *  it's the "old" style that doesn't use rports.
 861  */
 862 #define fc_starget_show_function(field, format_string, sz, cast)        \
 863 static ssize_t                                                          \
 864 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 865 {                                                                       \
 866         struct scsi_target *starget = transport_class_to_starget(cdev); \
 867         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 868         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 869         struct fc_rport *rport = starget_to_rport(starget);             \
 870         if (rport)                                                      \
 871                 fc_starget_##field(starget) = rport->field;             \
 872         else if (i->f->get_starget_##field)                             \
 873                 i->f->get_starget_##field(starget);                     \
 874         return snprintf(buf, sz, format_string,                         \
 875                 cast fc_starget_##field(starget));                      \
 876 }
 877
 878 #define fc_starget_rd_attr(field, format_string, sz)                    \
 879         fc_starget_show_function(field, format_string, sz, )            \
 880 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 881                          show_fc_starget_##field, NULL)
 882
 883 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 884         fc_starget_show_function(field, format_string, sz, (cast))      \
 885 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 886                           show_fc_starget_##field, NULL)
 887
 888 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 889         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 890         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 891         i->private_starget_attrs[count].store = NULL;                   \
 892         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 893         if (i->f->show_starget_##field)                                 \
 894                 count++
 895
 896 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 897         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 898         if (!i->f->set_starget_##field) {                               \
 899                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 900                 i->private_starget_attrs[count].store = NULL;           \
 901         }                                                               \
 902         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 903         if (i->f->show_starget_##field)                                 \
 904                 count++
 905
 906 /* The FC Transport SCSI Target Attributes: */
 907 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 908 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 909 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 910
 911
 912 /*
 913  * Host Attribute Management
 914  */
 915
 916 #define fc_host_show_function(field, format_string, sz, cast)           \
 917 static ssize_t                                                          \
 918 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 919 {                                                                       \
 920         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 921         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 922         if (i->f->get_host_##field)                                     \
 923                 i->f->get_host_##field(shost);                          \
 924         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 925 }
 926
 927 #define fc_host_store_function(field)                                   \
 928 static ssize_t                                                          \
 929 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 930                            size_t count)                                \
 931 {                                                                       \
 932         int val;                                                        \
 933         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 934         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 935         char *cp;                                                       \
 936                                                                         \
 937         val = simple_strtoul(buf, &cp, 0);                              \
 938         if (*cp && (*cp != '\n'))                                       \
 939                 return -EINVAL;                                         \
 940         i->f->set_host_##field(shost, val);                             \
 941         return count;                                                   \
 942 }
 943
 944 #define fc_host_store_str_function(field, slen)                         \
 945 static ssize_t                                                          \
 946 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 947                            size_t count)                                \
 948 {                                                                       \
 949         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 950         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 951         unsigned int cnt=count;                                         \
 952                                                                         \
 953         /* count may include a LF at end of string */                   \
 954         if (buf[cnt-1] == '\n')                                         \
 955                 cnt--;                                                  \
 956         if (cnt > ((slen) - 1))                                         \
 957                 return -EINVAL;                                         \
 958         memcpy(fc_host_##field(shost), buf, cnt);                       \
 959         i->f->set_host_##field(shost);                                  \
 960         return count;                                                   \
 961 }
 962
 963 #define fc_host_rd_attr(field, format_string, sz)                       \
 964         fc_host_show_function(field, format_string, sz, )               \
 965 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 966                          show_fc_host_##field, NULL)
 967
 968 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 969         fc_host_show_function(field, format_string, sz, (cast))         \
 970 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 971                           show_fc_host_##field, NULL)
 972
 973 #define fc_host_rw_attr(field, format_string, sz)                       \
 974         fc_host_show_function(field, format_string, sz, )               \
 975         fc_host_store_function(field)                                   \
 976 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 977                         show_fc_host_##field,                           \
 978                         store_fc_host_##field)
 979
 980 #define fc_host_rd_enum_attr(title, maxlen)                             \
 981 static ssize_t                                                          \
 982 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 983 {                                                                       \
 984         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 985         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 986         const char *name;                                               \
 987         if (i->f->get_host_##title)                                     \
 988                 i->f->get_host_##title(shost);                          \
 989         name = get_fc_##title##_name(fc_host_##title(shost));           \
 990         if (!name)                                                      \
 991                 return -EINVAL;                                         \
 992         return snprintf(buf, maxlen, "%s\n", name);                     \
 993 }                                                                       \
 994 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 995
 996 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 997         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 998         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 999         i->private_host_attrs[count].store = NULL;                      \
1000         i->host_attrs[count] = &i->private_host_attrs[count];           \
1001         if (i->f->show_host_##field)                                    \
1002                 count++
1003
1004 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1005         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1006         if (!i->f->set_host_##field) {                                  \
1007                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1008                 i->private_host_attrs[count].store = NULL;              \
1009         }                                                               \
1010         i->host_attrs[count] = &i->private_host_attrs[count];           \
1011         if (i->f->show_host_##field)                                    \
1012                 count++
1013
1014
1015 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1016 static ssize_t                                                          \
1017 show_fc_host_##field (struct class_device *cdev, char *buf)             \
1018 {                                                                       \
1019         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
1020         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1021 }
1022
1023 #define fc_private_host_rd_attr(field, format_string, sz)               \
1024         fc_private_host_show_function(field, format_string, sz, )       \
1025 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
1026                          show_fc_host_##field, NULL)
1027
1028 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1029         fc_private_host_show_function(field, format_string, sz, (cast)) \
1030 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
1031                           show_fc_host_##field, NULL)
1032
1033 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1034         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1035         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1036         i->private_host_attrs[count].store = NULL;                      \
1037         i->host_attrs[count] = &i->private_host_attrs[count];           \
1038         count++
1039
1040 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1041 {                                                                       \
1042         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1043         i->host_attrs[count] = &i->private_host_attrs[count];           \
1044         count++;                                                        \
1045 }
1046
1047
1048 /* Fixed Host Attributes */
1049
1050 static ssize_t
1051 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
1052 {
1053         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1054
1055         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1056                 return snprintf(buf, 20, "unspecified\n");
1057
1058         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1059 }
1060 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1061                 show_fc_host_supported_classes, NULL);
1062
1063 static ssize_t
1064 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
1065 {
1066         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1067         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1068 }
1069 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1070                 show_fc_host_supported_fc4s, NULL);
1071
1072 static ssize_t
1073 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
1074 {
1075         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1076
1077         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1078                 return snprintf(buf, 20, "unknown\n");
1079
1080         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1081 }
1082 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1083                 show_fc_host_supported_speeds, NULL);
1084
1085
1086 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1087 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1088 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1089                              unsigned long long);
1090 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1091 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1092
1093
1094 /* Dynamic Host Attributes */
1095
1096 static ssize_t
1097 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
1098 {
1099         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1100         struct fc_internal *i = to_fc_internal(shost->transportt);
1101
1102         if (i->f->get_host_active_fc4s)
1103                 i->f->get_host_active_fc4s(shost);
1104
1105         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1106 }
1107 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1108                 show_fc_host_active_fc4s, NULL);
1109
1110 static ssize_t
1111 show_fc_host_speed (struct class_device *cdev, char *buf)
1112 {
1113         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1114         struct fc_internal *i = to_fc_internal(shost->transportt);
1115
1116         if (i->f->get_host_speed)
1117                 i->f->get_host_speed(shost);
1118
1119         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1120                 return snprintf(buf, 20, "unknown\n");
1121
1122         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1123 }
1124 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
1125                 show_fc_host_speed, NULL);
1126
1127
1128 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1129 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1130 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1131 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1132 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1133
1134 fc_private_host_show_function(system_hostname, "%s\n",
1135                 FC_SYMBOLIC_NAME_SIZE + 1, )
1136 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1137 static FC_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1138                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1139
1140
1141 /* Private Host Attributes */
1142
1143 static ssize_t
1144 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
1145 {
1146         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1147         const char *name;
1148
1149         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1150         if (!name)
1151                 return -EINVAL;
1152         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1153 }
1154
1155 #define get_list_head_entry(pos, head, member)          \
1156         pos = list_entry((head)->next, typeof(*pos), member)
1157
1158 static ssize_t
1159 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
1160         const char *buf, size_t count)
1161 {
1162         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1163         struct fc_rport *rport;
1164         enum fc_tgtid_binding_type val;
1165         unsigned long flags;
1166
1167         if (get_fc_tgtid_bind_type_match(buf, &val))
1168                 return -EINVAL;
1169
1170         /* if changing bind type, purge all unused consistent bindings */
1171         if (val != fc_host_tgtid_bind_type(shost)) {
1172                 spin_lock_irqsave(shost->host_lock, flags);
1173                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1174                         get_list_head_entry(rport,
1175                                 &fc_host_rport_bindings(shost), peers);
1176                         list_del(&rport->peers);
1177                         rport->port_state = FC_PORTSTATE_DELETED;
1178                         fc_queue_work(shost, &rport->rport_delete_work);
1179                 }
1180                 spin_unlock_irqrestore(shost->host_lock, flags);
1181         }
1182
1183         fc_host_tgtid_bind_type(shost) = val;
1184         return count;
1185 }
1186
1187 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1188                         show_fc_private_host_tgtid_bind_type,
1189                         store_fc_private_host_tgtid_bind_type);
1190
1191 static ssize_t
1192 store_fc_private_host_issue_lip(struct class_device *cdev,
1193         const char *buf, size_t count)
1194 {
1195         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1196         struct fc_internal *i = to_fc_internal(shost->transportt);
1197         int ret;
1198
1199         /* ignore any data value written to the attribute */
1200         if (i->f->issue_fc_host_lip) {
1201                 ret = i->f->issue_fc_host_lip(shost);
1202                 return ret ? ret: count;
1203         }
1204
1205         return -ENOENT;
1206 }
1207
1208 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1209                         store_fc_private_host_issue_lip);
1210
1211 /*
1212  * Host Statistics Management
1213  */
1214
1215 /* Show a given an attribute in the statistics group */
1216 static ssize_t
1217 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
1218 {
1219         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1220         struct fc_internal *i = to_fc_internal(shost->transportt);
1221         struct fc_host_statistics *stats;
1222         ssize_t ret = -ENOENT;
1223
1224         if (offset > sizeof(struct fc_host_statistics) ||
1225             offset % sizeof(u64) != 0)
1226                 WARN_ON(1);
1227
1228         if (i->f->get_fc_host_stats) {
1229                 stats = (i->f->get_fc_host_stats)(shost);
1230                 if (stats)
1231                         ret = snprintf(buf, 20, "0x%llx\n",
1232                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1233         }
1234         return ret;
1235 }
1236
1237
1238 /* generate a read-only statistics attribute */
1239 #define fc_host_statistic(name)                                         \
1240 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
1241 {                                                                       \
1242         return fc_stat_show(cd, buf,                                    \
1243                             offsetof(struct fc_host_statistics, name)); \
1244 }                                                                       \
1245 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1246
1247 fc_host_statistic(seconds_since_last_reset);
1248 fc_host_statistic(tx_frames);
1249 fc_host_statistic(tx_words);
1250 fc_host_statistic(rx_frames);
1251 fc_host_statistic(rx_words);
1252 fc_host_statistic(lip_count);
1253 fc_host_statistic(nos_count);
1254 fc_host_statistic(error_frames);
1255 fc_host_statistic(dumped_frames);
1256 fc_host_statistic(link_failure_count);
1257 fc_host_statistic(loss_of_sync_count);
1258 fc_host_statistic(loss_of_signal_count);
1259 fc_host_statistic(prim_seq_protocol_err_count);
1260 fc_host_statistic(invalid_tx_word_count);
1261 fc_host_statistic(invalid_crc_count);
1262 fc_host_statistic(fcp_input_requests);
1263 fc_host_statistic(fcp_output_requests);
1264 fc_host_statistic(fcp_control_requests);
1265 fc_host_statistic(fcp_input_megabytes);
1266 fc_host_statistic(fcp_output_megabytes);
1267
1268 static ssize_t
1269 fc_reset_statistics(struct class_device *cdev, const char *buf,
1270                            size_t count)
1271 {
1272         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1273         struct fc_internal *i = to_fc_internal(shost->transportt);
1274
1275         /* ignore any data value written to the attribute */
1276         if (i->f->reset_fc_host_stats) {
1277                 i->f->reset_fc_host_stats(shost);
1278                 return count;
1279         }
1280
1281         return -ENOENT;
1282 }
1283 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1284                                 fc_reset_statistics);
1285
1286
1287 static struct attribute *fc_statistics_attrs[] = {
1288         &class_device_attr_host_seconds_since_last_reset.attr,
1289         &class_device_attr_host_tx_frames.attr,
1290         &class_device_attr_host_tx_words.attr,
1291         &class_device_attr_host_rx_frames.attr,
1292         &class_device_attr_host_rx_words.attr,
1293         &class_device_attr_host_lip_count.attr,
1294         &class_device_attr_host_nos_count.attr,
1295         &class_device_attr_host_error_frames.attr,
1296         &class_device_attr_host_dumped_frames.attr,
1297         &class_device_attr_host_link_failure_count.attr,
1298         &class_device_attr_host_loss_of_sync_count.attr,
1299         &class_device_attr_host_loss_of_signal_count.attr,
1300         &class_device_attr_host_prim_seq_protocol_err_count.attr,
1301         &class_device_attr_host_invalid_tx_word_count.attr,
1302         &class_device_attr_host_invalid_crc_count.attr,
1303         &class_device_attr_host_fcp_input_requests.attr,
1304         &class_device_attr_host_fcp_output_requests.attr,
1305         &class_device_attr_host_fcp_control_requests.attr,
1306         &class_device_attr_host_fcp_input_megabytes.attr,
1307         &class_device_attr_host_fcp_output_megabytes.attr,
1308         &class_device_attr_host_reset_statistics.attr,
1309         NULL
1310 };
1311
1312 static struct attribute_group fc_statistics_group = {
1313         .name = "statistics",
1314         .attrs = fc_statistics_attrs,
1315 };
1316
1317 static int fc_host_match(struct attribute_container *cont,
1318                           struct device *dev)
1319 {
1320         struct Scsi_Host *shost;
1321         struct fc_internal *i;
1322
1323         if (!scsi_is_host_device(dev))
1324                 return 0;
1325
1326         shost = dev_to_shost(dev);
1327         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1328             != &fc_host_class.class)
1329                 return 0;
1330
1331         i = to_fc_internal(shost->transportt);
1332
1333         return &i->t.host_attrs.ac == cont;
1334 }
1335
1336 static int fc_target_match(struct attribute_container *cont,
1337                             struct device *dev)
1338 {
1339         struct Scsi_Host *shost;
1340         struct fc_internal *i;
1341
1342         if (!scsi_is_target_device(dev))
1343                 return 0;
1344
1345         shost = dev_to_shost(dev->parent);
1346         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1347             != &fc_host_class.class)
1348                 return 0;
1349
1350         i = to_fc_internal(shost->transportt);
1351
1352         return &i->t.target_attrs.ac == cont;
1353 }
1354
1355 static void fc_rport_dev_release(struct device *dev)
1356 {
1357         struct fc_rport *rport = dev_to_rport(dev);
1358         put_device(dev->parent);
1359         kfree(rport);
1360 }
1361
1362 int scsi_is_fc_rport(const struct device *dev)
1363 {
1364         return dev->release == fc_rport_dev_release;
1365 }
1366 EXPORT_SYMBOL(scsi_is_fc_rport);
1367
1368 static int fc_rport_match(struct attribute_container *cont,
1369                             struct device *dev)
1370 {
1371         struct Scsi_Host *shost;
1372         struct fc_internal *i;
1373
1374         if (!scsi_is_fc_rport(dev))
1375                 return 0;
1376
1377         shost = dev_to_shost(dev->parent);
1378         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1379             != &fc_host_class.class)
1380                 return 0;
1381
1382         i = to_fc_internal(shost->transportt);
1383
1384         return &i->rport_attr_cont.ac == cont;
1385 }
1386
1387
1388 /**
1389  * fc_timed_out - FC Transport I/O timeout intercept handler
1390  *
1391  * @scmd:       The SCSI command which timed out
1392  *
1393  * This routine protects against error handlers getting invoked while a
1394  * rport is in a blocked state, typically due to a temporarily loss of
1395  * connectivity. If the error handlers are allowed to proceed, requests
1396  * to abort i/o, reset the target, etc will likely fail as there is no way
1397  * to communicate with the device to perform the requested function. These
1398  * failures may result in the midlayer taking the device offline, requiring
1399  * manual intervention to restore operation.
1400  *
1401  * This routine, called whenever an i/o times out, validates the state of
1402  * the underlying rport. If the rport is blocked, it returns
1403  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1404  * Eventually, either the device will return, or devloss_tmo will fire,
1405  * and when the timeout then fires, it will be handled normally.
1406  * If the rport is not blocked, normal error handling continues.
1407  *
1408  * Notes:
1409  *      This routine assumes no locks are held on entry.
1410  **/
1411 static enum scsi_eh_timer_return
1412 fc_timed_out(struct scsi_cmnd *scmd)
1413 {
1414         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1415
1416         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1417                 return EH_RESET_TIMER;
1418
1419         return EH_NOT_HANDLED;
1420 }
1421
1422 /*
1423  * Must be called with shost->host_lock held
1424  */
1425 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1426                 uint id, uint lun)
1427 {
1428         struct fc_rport *rport;
1429
1430         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1431                 if (rport->scsi_target_id == -1)
1432                         continue;
1433
1434                 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1435                     (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1436                         scsi_scan_target(&rport->dev, rport->channel,
1437                                          rport->scsi_target_id, lun, 1);
1438                 }
1439         }
1440
1441         return 0;
1442 }
1443
1444 struct scsi_transport_template *
1445 fc_attach_transport(struct fc_function_template *ft)
1446 {
1447         int count;
1448         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
1449                                         GFP_KERNEL);
1450
1451         if (unlikely(!i))
1452                 return NULL;
1453
1454         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1455         i->t.target_attrs.ac.class = &fc_transport_class.class;
1456         i->t.target_attrs.ac.match = fc_target_match;
1457         i->t.target_size = sizeof(struct fc_starget_attrs);
1458         transport_container_register(&i->t.target_attrs);
1459
1460         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1461         i->t.host_attrs.ac.class = &fc_host_class.class;
1462         i->t.host_attrs.ac.match = fc_host_match;
1463         i->t.host_size = sizeof(struct fc_host_attrs);
1464         if (ft->get_fc_host_stats)
1465                 i->t.host_attrs.statistics = &fc_statistics_group;
1466         transport_container_register(&i->t.host_attrs);
1467
1468         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1469         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1470         i->rport_attr_cont.ac.match = fc_rport_match;
1471         transport_container_register(&i->rport_attr_cont);
1472
1473         i->f = ft;
1474
1475         /* Transport uses the shost workq for scsi scanning */
1476         i->t.create_work_queue = 1;
1477
1478         i->t.eh_timed_out = fc_timed_out;
1479
1480         i->t.user_scan = fc_user_scan;
1481
1482         /*
1483          * Setup SCSI Target Attributes.
1484          */
1485         count = 0;
1486         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1487         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1488         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1489
1490         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1491
1492         i->starget_attrs[count] = NULL;
1493
1494
1495         /*
1496          * Setup SCSI Host Attributes.
1497          */
1498         count=0;
1499         SETUP_HOST_ATTRIBUTE_RD(node_name);
1500         SETUP_HOST_ATTRIBUTE_RD(port_name);
1501         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1502         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1503         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1504         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1505         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1506         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1507
1508         SETUP_HOST_ATTRIBUTE_RD(port_id);
1509         SETUP_HOST_ATTRIBUTE_RD(port_type);
1510         SETUP_HOST_ATTRIBUTE_RD(port_state);
1511         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1512         SETUP_HOST_ATTRIBUTE_RD(speed);
1513         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1514         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1515         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
1516
1517         /* Transport-managed attributes */
1518         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1519         if (ft->issue_fc_host_lip)
1520                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1521
1522         BUG_ON(count > FC_HOST_NUM_ATTRS);
1523
1524         i->host_attrs[count] = NULL;
1525
1526         /*
1527          * Setup Remote Port Attributes.
1528          */
1529         count=0;
1530         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1531         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1532         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1533         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1534         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1535         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1536         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1537         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1538         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1539         if (ft->terminate_rport_io)
1540                 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
1541
1542         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1543
1544         i->rport_attrs[count] = NULL;
1545
1546         return &i->t;
1547 }
1548 EXPORT_SYMBOL(fc_attach_transport);
1549
1550 void fc_release_transport(struct scsi_transport_template *t)
1551 {
1552         struct fc_internal *i = to_fc_internal(t);
1553
1554         transport_container_unregister(&i->t.target_attrs);
1555         transport_container_unregister(&i->t.host_attrs);
1556         transport_container_unregister(&i->rport_attr_cont);
1557
1558         kfree(i);
1559 }
1560 EXPORT_SYMBOL(fc_release_transport);
1561
1562 /**
1563  * fc_queue_work - Queue work to the fc_host workqueue.
1564  * @shost:      Pointer to Scsi_Host bound to fc_host.
1565  * @work:       Work to queue for execution.
1566  *
1567  * Return value:
1568  *      1 - work queued for execution
1569  *      0 - work is already queued
1570  *      -EINVAL - work queue doesn't exist
1571  **/
1572 static int
1573 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
1574 {
1575         if (unlikely(!fc_host_work_q(shost))) {
1576                 printk(KERN_ERR
1577                         "ERROR: FC host '%s' attempted to queue work, "
1578                         "when no workqueue created.\n", shost->hostt->name);
1579                 dump_stack();
1580
1581                 return -EINVAL;
1582         }
1583
1584         return queue_work(fc_host_work_q(shost), work);
1585 }
1586
1587 /**
1588  * fc_flush_work - Flush a fc_host's workqueue.
1589  * @shost:      Pointer to Scsi_Host bound to fc_host.
1590  **/
1591 static void
1592 fc_flush_work(struct Scsi_Host *shost)
1593 {
1594         if (!fc_host_work_q(shost)) {
1595                 printk(KERN_ERR
1596                         "ERROR: FC host '%s' attempted to flush work, "
1597                         "when no workqueue created.\n", shost->hostt->name);
1598                 dump_stack();
1599                 return;
1600         }
1601
1602         flush_workqueue(fc_host_work_q(shost));
1603 }
1604
1605 /**
1606  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
1607  * @shost:      Pointer to Scsi_Host bound to fc_host.
1608  * @work:       Work to queue for execution.
1609  * @delay:      jiffies to delay the work queuing
1610  *
1611  * Return value:
1612  *      1 on success / 0 already queued / < 0 for error
1613  **/
1614 static int
1615 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
1616                                 unsigned long delay)
1617 {
1618         if (unlikely(!fc_host_devloss_work_q(shost))) {
1619                 printk(KERN_ERR
1620                         "ERROR: FC host '%s' attempted to queue work, "
1621                         "when no workqueue created.\n", shost->hostt->name);
1622                 dump_stack();
1623
1624                 return -EINVAL;
1625         }
1626
1627         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
1628 }
1629
1630 /**
1631  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
1632  * @shost:      Pointer to Scsi_Host bound to fc_host.
1633  **/
1634 static void
1635 fc_flush_devloss(struct Scsi_Host *shost)
1636 {
1637         if (!fc_host_devloss_work_q(shost)) {
1638                 printk(KERN_ERR
1639                         "ERROR: FC host '%s' attempted to flush work, "
1640                         "when no workqueue created.\n", shost->hostt->name);
1641                 dump_stack();
1642                 return;
1643         }
1644
1645         flush_workqueue(fc_host_devloss_work_q(shost));
1646 }
1647
1648
1649 /**
1650  * fc_remove_host - called to terminate any fc_transport-related elements
1651  *                  for a scsi host.
1652  * @rport:      remote port to be unblocked.
1653  *
1654  * This routine is expected to be called immediately preceeding the
1655  * a driver's call to scsi_remove_host().
1656  *
1657  * WARNING: A driver utilizing the fc_transport, which fails to call
1658  *   this routine prior to scsi_remote_host(), will leave dangling
1659  *   objects in /sys/class/fc_remote_ports. Access to any of these
1660  *   objects can result in a system crash !!!
1661  *
1662  * Notes:
1663  *      This routine assumes no locks are held on entry.
1664  **/
1665 void
1666 fc_remove_host(struct Scsi_Host *shost)
1667 {
1668         struct fc_rport *rport, *next_rport;
1669         struct workqueue_struct *work_q;
1670         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1671
1672         /* Remove any remote ports */
1673         list_for_each_entry_safe(rport, next_rport,
1674                         &fc_host->rports, peers) {
1675                 list_del(&rport->peers);
1676                 rport->port_state = FC_PORTSTATE_DELETED;
1677                 fc_queue_work(shost, &rport->rport_delete_work);
1678         }
1679
1680         list_for_each_entry_safe(rport, next_rport,
1681                         &fc_host->rport_bindings, peers) {
1682                 list_del(&rport->peers);
1683                 rport->port_state = FC_PORTSTATE_DELETED;
1684                 fc_queue_work(shost, &rport->rport_delete_work);
1685         }
1686
1687         /* flush all scan work items */
1688         scsi_flush_work(shost);
1689
1690         /* flush all stgt delete, and rport delete work items, then kill it  */
1691         if (fc_host->work_q) {
1692                 work_q = fc_host->work_q;
1693                 fc_host->work_q = NULL;
1694                 destroy_workqueue(work_q);
1695         }
1696
1697         /* flush all devloss work items, then kill it  */
1698         if (fc_host->devloss_work_q) {
1699                 work_q = fc_host->devloss_work_q;
1700                 fc_host->devloss_work_q = NULL;
1701                 destroy_workqueue(work_q);
1702         }
1703 }
1704 EXPORT_SYMBOL(fc_remove_host);
1705
1706
1707 /**
1708  * fc_starget_delete - called to delete the scsi decendents of an rport
1709  *                  (target and all sdevs)
1710  *
1711  * @work:       remote port to be operated on.
1712  **/
1713 static void
1714 fc_starget_delete(struct work_struct *work)
1715 {
1716         struct fc_rport *rport =
1717                 container_of(work, struct fc_rport, stgt_delete_work);
1718         struct Scsi_Host *shost = rport_to_shost(rport);
1719         unsigned long flags;
1720         struct fc_internal *i = to_fc_internal(shost->transportt);
1721
1722         /*
1723          * Involve the LLDD if possible. All io on the rport is to
1724          * be terminated, either as part of the dev_loss_tmo callback
1725          * processing, or via the terminate_rport_io function.
1726          */
1727         if (i->f->dev_loss_tmo_callbk)
1728                 i->f->dev_loss_tmo_callbk(rport);
1729         else if (i->f->terminate_rport_io)
1730                 i->f->terminate_rport_io(rport);
1731
1732         spin_lock_irqsave(shost->host_lock, flags);
1733         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
1734                 spin_unlock_irqrestore(shost->host_lock, flags);
1735                 if (!cancel_delayed_work(&rport->fail_io_work))
1736                         fc_flush_devloss(shost);
1737                 if (!cancel_delayed_work(&rport->dev_loss_work))
1738                         fc_flush_devloss(shost);
1739                 spin_lock_irqsave(shost->host_lock, flags);
1740                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1741         }
1742         spin_unlock_irqrestore(shost->host_lock, flags);
1743
1744         scsi_remove_target(&rport->dev);
1745 }
1746
1747
1748 /**
1749  * fc_rport_final_delete - finish rport termination and delete it.
1750  *
1751  * @work:       remote port to be deleted.
1752  **/
1753 static void
1754 fc_rport_final_delete(struct work_struct *work)
1755 {
1756         struct fc_rport *rport =
1757                 container_of(work, struct fc_rport, rport_delete_work);
1758         struct device *dev = &rport->dev;
1759         struct Scsi_Host *shost = rport_to_shost(rport);
1760         struct fc_internal *i = to_fc_internal(shost->transportt);
1761
1762         /*
1763          * if a scan is pending, flush the SCSI Host work_q so that
1764          * that we can reclaim the rport scan work element.
1765          */
1766         if (rport->flags & FC_RPORT_SCAN_PENDING)
1767                 scsi_flush_work(shost);
1768
1769         /* Delete SCSI target and sdevs */
1770         if (rport->scsi_target_id != -1)
1771                 fc_starget_delete(&rport->stgt_delete_work);
1772         else if (i->f->dev_loss_tmo_callbk)
1773                 i->f->dev_loss_tmo_callbk(rport);
1774         else if (i->f->terminate_rport_io)
1775                 i->f->terminate_rport_io(rport);
1776
1777         transport_remove_device(dev);
1778         device_del(dev);
1779         transport_destroy_device(dev);
1780         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1781         put_device(dev);                        /* for self-reference */
1782 }
1783
1784
1785 /**
1786  * fc_rport_create - allocates and creates a remote FC port.
1787  * @shost:      scsi host the remote port is connected to.
1788  * @channel:    Channel on shost port connected to.
1789  * @ids:        The world wide names, fc address, and FC4 port
1790  *              roles for the remote port.
1791  *
1792  * Allocates and creates the remoter port structure, including the
1793  * class and sysfs creation.
1794  *
1795  * Notes:
1796  *      This routine assumes no locks are held on entry.
1797  **/
1798 struct fc_rport *
1799 fc_rport_create(struct Scsi_Host *shost, int channel,
1800         struct fc_rport_identifiers  *ids)
1801 {
1802         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1803         struct fc_internal *fci = to_fc_internal(shost->transportt);
1804         struct fc_rport *rport;
1805         struct device *dev;
1806         unsigned long flags;
1807         int error;
1808         size_t size;
1809
1810         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1811         rport = kzalloc(size, GFP_KERNEL);
1812         if (unlikely(!rport)) {
1813                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1814                 return NULL;
1815         }
1816
1817         rport->maxframe_size = -1;
1818         rport->supported_classes = FC_COS_UNSPECIFIED;
1819         rport->dev_loss_tmo = fc_dev_loss_tmo;
1820         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1821         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1822         rport->port_id = ids->port_id;
1823         rport->roles = ids->roles;
1824         rport->port_state = FC_PORTSTATE_ONLINE;
1825         if (fci->f->dd_fcrport_size)
1826                 rport->dd_data = &rport[1];
1827         rport->channel = channel;
1828         rport->fast_io_fail_tmo = -1;
1829
1830         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
1831         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
1832         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
1833         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
1834         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
1835
1836         spin_lock_irqsave(shost->host_lock, flags);
1837
1838         rport->number = fc_host->next_rport_number++;
1839         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1840                 rport->scsi_target_id = fc_host->next_target_id++;
1841         else
1842                 rport->scsi_target_id = -1;
1843         list_add_tail(&rport->peers, &fc_host->rports);
1844         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
1845
1846         spin_unlock_irqrestore(shost->host_lock, flags);
1847
1848         dev = &rport->dev;
1849         device_initialize(dev);                 /* takes self reference */
1850         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
1851         dev->release = fc_rport_dev_release;
1852         sprintf(dev->bus_id, "rport-%d:%d-%d",
1853                 shost->host_no, channel, rport->number);
1854         transport_setup_device(dev);
1855
1856         error = device_add(dev);
1857         if (error) {
1858                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1859                 goto delete_rport;
1860         }
1861         transport_add_device(dev);
1862         transport_configure_device(dev);
1863
1864         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1865                 /* initiate a scan of the target */
1866                 rport->flags |= FC_RPORT_SCAN_PENDING;
1867                 scsi_queue_work(shost, &rport->scan_work);
1868         }
1869
1870         return rport;
1871
1872 delete_rport:
1873         transport_destroy_device(dev);
1874         spin_lock_irqsave(shost->host_lock, flags);
1875         list_del(&rport->peers);
1876         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1877         spin_unlock_irqrestore(shost->host_lock, flags);
1878         put_device(dev->parent);
1879         kfree(rport);
1880         return NULL;
1881 }
1882
1883 /**
1884  * fc_remote_port_add - notifies the fc transport of the existence
1885  *              of a remote FC port.
1886  * @shost:      scsi host the remote port is connected to.
1887  * @channel:    Channel on shost port connected to.
1888  * @ids:        The world wide names, fc address, and FC4 port
1889  *              roles for the remote port.
1890  *
1891  * The LLDD calls this routine to notify the transport of the existence
1892  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1893  * of the port, it's FC address (port_id), and the FC4 roles that are
1894  * active for the port.
1895  *
1896  * For ports that are FCP targets (aka scsi targets), the FC transport
1897  * maintains consistent target id bindings on behalf of the LLDD.
1898  * A consistent target id binding is an assignment of a target id to
1899  * a remote port identifier, which persists while the scsi host is
1900  * attached. The remote port can disappear, then later reappear, and
1901  * it's target id assignment remains the same. This allows for shifts
1902  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1903  * changes to the scsi subsystem which is based on scsi host number and
1904  * target id values.  Bindings are only valid during the attachment of
1905  * the scsi host. If the host detaches, then later re-attaches, target
1906  * id bindings may change.
1907  *
1908  * This routine is responsible for returning a remote port structure.
1909  * The routine will search the list of remote ports it maintains
1910  * internally on behalf of consistent target id mappings. If found, the
1911  * remote port structure will be reused. Otherwise, a new remote port
1912  * structure will be allocated.
1913  *
1914  * Whenever a remote port is allocated, a new fc_remote_port class
1915  * device is created.
1916  *
1917  * Should not be called from interrupt context.
1918  *
1919  * Notes:
1920  *      This routine assumes no locks are held on entry.
1921  **/
1922 struct fc_rport *
1923 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1924         struct fc_rport_identifiers  *ids)
1925 {
1926         struct fc_internal *fci = to_fc_internal(shost->transportt);
1927         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1928         struct fc_rport *rport;
1929         unsigned long flags;
1930         int match = 0;
1931
1932         /* ensure any stgt delete functions are done */
1933         fc_flush_work(shost);
1934
1935         /*
1936          * Search the list of "active" rports, for an rport that has been
1937          * deleted, but we've held off the real delete while the target
1938          * is in a "blocked" state.
1939          */
1940         spin_lock_irqsave(shost->host_lock, flags);
1941
1942         list_for_each_entry(rport, &fc_host->rports, peers) {
1943
1944                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1945                         (rport->channel == channel)) {
1946
1947                         switch (fc_host->tgtid_bind_type) {
1948                         case FC_TGTID_BIND_BY_WWPN:
1949                         case FC_TGTID_BIND_NONE:
1950                                 if (rport->port_name == ids->port_name)
1951                                         match = 1;
1952                                 break;
1953                         case FC_TGTID_BIND_BY_WWNN:
1954                                 if (rport->node_name == ids->node_name)
1955                                         match = 1;
1956                                 break;
1957                         case FC_TGTID_BIND_BY_ID:
1958                                 if (rport->port_id == ids->port_id)
1959                                         match = 1;
1960                                 break;
1961                         }
1962
1963                         if (match) {
1964                                 struct delayed_work *work =
1965                                                         &rport->dev_loss_work;
1966
1967                                 memcpy(&rport->node_name, &ids->node_name,
1968                                         sizeof(rport->node_name));
1969                                 memcpy(&rport->port_name, &ids->port_name,
1970                                         sizeof(rport->port_name));
1971                                 rport->port_id = ids->port_id;
1972
1973                                 rport->port_state = FC_PORTSTATE_ONLINE;
1974                                 rport->roles = ids->roles;
1975
1976                                 spin_unlock_irqrestore(shost->host_lock, flags);
1977
1978                                 if (fci->f->dd_fcrport_size)
1979                                         memset(rport->dd_data, 0,
1980                                                 fci->f->dd_fcrport_size);
1981
1982                                 /*
1983                                  * If we were blocked, we were a target.
1984                                  * If no longer a target, we leave the timer
1985                                  * running in case the port changes roles
1986                                  * prior to the timer expiring. If the timer
1987                                  * fires, the target will be torn down.
1988                                  */
1989                                 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1990                                         return rport;
1991
1992                                 /* restart the target */
1993
1994                                 /*
1995                                  * Stop the target timers first. Take no action
1996                                  * on the del_timer failure as the state
1997                                  * machine state change will validate the
1998                                  * transaction.
1999                                  */
2000                                 if (!cancel_delayed_work(&rport->fail_io_work))
2001                                         fc_flush_devloss(shost);
2002                                 if (!cancel_delayed_work(work))
2003                                         fc_flush_devloss(shost);
2004
2005                                 spin_lock_irqsave(shost->host_lock, flags);
2006
2007                                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2008
2009                                 /* initiate a scan of the target */
2010                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2011                                 scsi_queue_work(shost, &rport->scan_work);
2012
2013                                 spin_unlock_irqrestore(shost->host_lock, flags);
2014
2015                                 scsi_target_unblock(&rport->dev);
2016
2017                                 return rport;
2018                         }
2019                 }
2020         }
2021
2022         /* Search the bindings array */
2023         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2024
2025                 /* search for a matching consistent binding */
2026
2027                 list_for_each_entry(rport, &fc_host->rport_bindings,
2028                                         peers) {
2029                         if (rport->channel != channel)
2030                                 continue;
2031
2032                         switch (fc_host->tgtid_bind_type) {
2033                         case FC_TGTID_BIND_BY_WWPN:
2034                                 if (rport->port_name == ids->port_name)
2035                                         match = 1;
2036                                 break;
2037                         case FC_TGTID_BIND_BY_WWNN:
2038                                 if (rport->node_name == ids->node_name)
2039                                         match = 1;
2040                                 break;
2041                         case FC_TGTID_BIND_BY_ID:
2042                                 if (rport->port_id == ids->port_id)
2043                                         match = 1;
2044                                 break;
2045                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2046                                 break;
2047                         }
2048
2049                         if (match) {
2050                                 list_move_tail(&rport->peers, &fc_host->rports);
2051                                 break;
2052                         }
2053                 }
2054
2055                 if (match) {
2056                         memcpy(&rport->node_name, &ids->node_name,
2057                                 sizeof(rport->node_name));
2058                         memcpy(&rport->port_name, &ids->port_name,
2059                                 sizeof(rport->port_name));
2060                         rport->port_id = ids->port_id;
2061                         rport->roles = ids->roles;
2062                         rport->port_state = FC_PORTSTATE_ONLINE;
2063
2064                         if (fci->f->dd_fcrport_size)
2065                                 memset(rport->dd_data, 0,
2066                                                 fci->f->dd_fcrport_size);
2067
2068                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
2069                                 /* initiate a scan of the target */
2070                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2071                                 scsi_queue_work(shost, &rport->scan_work);
2072                                 spin_unlock_irqrestore(shost->host_lock, flags);
2073                                 scsi_target_unblock(&rport->dev);
2074                         } else
2075                                 spin_unlock_irqrestore(shost->host_lock, flags);
2076
2077                         return rport;
2078                 }
2079         }
2080
2081         spin_unlock_irqrestore(shost->host_lock, flags);
2082
2083         /* No consistent binding found - create new remote port entry */
2084         rport = fc_rport_create(shost, channel, ids);
2085
2086         return rport;
2087 }
2088 EXPORT_SYMBOL(fc_remote_port_add);
2089
2090
2091 /**
2092  * fc_remote_port_delete - notifies the fc transport that a remote
2093  *              port is no longer in existence.
2094  * @rport:      The remote port that no longer exists
2095  *
2096  * The LLDD calls this routine to notify the transport that a remote
2097  * port is no longer part of the topology. Note: Although a port
2098  * may no longer be part of the topology, it may persist in the remote
2099  * ports displayed by the fc_host. We do this under 2 conditions:
2100  * - If the port was a scsi target, we delay its deletion by "blocking" it.
2101  *   This allows the port to temporarily disappear, then reappear without
2102  *   disrupting the SCSI device tree attached to it. During the "blocked"
2103  *   period the port will still exist.
2104  * - If the port was a scsi target and disappears for longer than we
2105  *   expect, we'll delete the port and the tear down the SCSI device tree
2106  *   attached to it. However, we want to semi-persist the target id assigned
2107  *   to that port if it eventually does exist. The port structure will
2108  *   remain (although with minimal information) so that the target id
2109  *   bindings remails.
2110  *
2111  * If the remote port is not an FCP Target, it will be fully torn down
2112  * and deallocated, including the fc_remote_port class device.
2113  *
2114  * If the remote port is an FCP Target, the port will be placed in a
2115  * temporary blocked state. From the LLDD's perspective, the rport no
2116  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2117  * exists, but all sdevs on it are blocked from further I/O. The following
2118  * is then expected:
2119  *   If the remote port does not return (signaled by a LLDD call to
2120  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2121  *   scsi target is removed - killing all outstanding i/o and removing the
2122  *   scsi devices attached ot it. The port structure will be marked Not
2123  *   Present and be partially cleared, leaving only enough information to
2124  *   recognize the remote port relative to the scsi target id binding if
2125  *   it later appears.  The port will remain as long as there is a valid
2126  *   binding (e.g. until the user changes the binding type or unloads the
2127  *   scsi host with the binding).
2128  *
2129  *   If the remote port returns within the dev_loss_tmo value (and matches
2130  *   according to the target id binding type), the port structure will be
2131  *   reused. If it is no longer a SCSI target, the target will be torn
2132  *   down. If it continues to be a SCSI target, then the target will be
2133  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2134  *   to ensure that all luns are detected.
2135  *
2136  * Called from normal process context only - cannot be called from interrupt.
2137  *
2138  * Notes:
2139  *      This routine assumes no locks are held on entry.
2140  **/
2141 void
2142 fc_remote_port_delete(struct fc_rport  *rport)
2143 {
2144         struct Scsi_Host *shost = rport_to_shost(rport);
2145         struct fc_internal *i = to_fc_internal(shost->transportt);
2146         int timeout = rport->dev_loss_tmo;
2147         unsigned long flags;
2148
2149         /*
2150          * No need to flush the fc_host work_q's, as all adds are synchronous.
2151          *
2152          * We do need to reclaim the rport scan work element, so eventually
2153          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2154          * there's still a scan pending.
2155          */
2156
2157         spin_lock_irqsave(shost->host_lock, flags);
2158
2159         /* If no scsi target id mapping, delete it */
2160         if (rport->scsi_target_id == -1) {
2161                 list_del(&rport->peers);
2162                 rport->port_state = FC_PORTSTATE_DELETED;
2163                 fc_queue_work(shost, &rport->rport_delete_work);
2164                 spin_unlock_irqrestore(shost->host_lock, flags);
2165                 return;
2166         }
2167
2168         rport->port_state = FC_PORTSTATE_BLOCKED;
2169
2170         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2171
2172         spin_unlock_irqrestore(shost->host_lock, flags);
2173
2174         scsi_target_block(&rport->dev);
2175
2176         /* see if we need to kill io faster than waiting for device loss */
2177         if ((rport->fast_io_fail_tmo != -1) &&
2178             (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
2179                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2180                                         rport->fast_io_fail_tmo * HZ);
2181
2182         /* cap the length the devices can be blocked until they are deleted */
2183         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2184 }
2185 EXPORT_SYMBOL(fc_remote_port_delete);
2186
2187 /**
2188  * fc_remote_port_rolechg - notifies the fc transport that the roles
2189  *              on a remote may have changed.
2190  * @rport:      The remote port that changed.
2191  *
2192  * The LLDD calls this routine to notify the transport that the roles
2193  * on a remote port may have changed. The largest effect of this is
2194  * if a port now becomes a FCP Target, it must be allocated a
2195  * scsi target id.  If the port is no longer a FCP target, any
2196  * scsi target id value assigned to it will persist in case the
2197  * role changes back to include FCP Target. No changes in the scsi
2198  * midlayer will be invoked if the role changes (in the expectation
2199  * that the role will be resumed. If it doesn't normal error processing
2200  * will take place).
2201  *
2202  * Should not be called from interrupt context.
2203  *
2204  * Notes:
2205  *      This routine assumes no locks are held on entry.
2206  **/
2207 void
2208 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2209 {
2210         struct Scsi_Host *shost = rport_to_shost(rport);
2211         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2212         unsigned long flags;
2213         int create = 0;
2214
2215         spin_lock_irqsave(shost->host_lock, flags);
2216         if (roles & FC_RPORT_ROLE_FCP_TARGET) {
2217                 if (rport->scsi_target_id == -1) {
2218                         rport->scsi_target_id = fc_host->next_target_id++;
2219                         create = 1;
2220                 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
2221                         create = 1;
2222         }
2223
2224         rport->roles = roles;
2225
2226         spin_unlock_irqrestore(shost->host_lock, flags);
2227
2228         if (create) {
2229                 /*
2230                  * There may have been a delete timer running on the
2231                  * port. Ensure that it is cancelled as we now know
2232                  * the port is an FCP Target.
2233                  * Note: we know the rport is exists and in an online
2234                  *  state as the LLDD would not have had an rport
2235                  *  reference to pass us.
2236                  *
2237                  * Take no action on the del_timer failure as the state
2238                  * machine state change will validate the
2239                  * transaction.
2240                  */
2241                 if (!cancel_delayed_work(&rport->fail_io_work))
2242                         fc_flush_devloss(shost);
2243                 if (!cancel_delayed_work(&rport->dev_loss_work))
2244                         fc_flush_devloss(shost);
2245
2246                 spin_lock_irqsave(shost->host_lock, flags);
2247                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2248                 spin_unlock_irqrestore(shost->host_lock, flags);
2249
2250                 /* ensure any stgt delete functions are done */
2251                 fc_flush_work(shost);
2252
2253                 /* initiate a scan of the target */
2254                 spin_lock_irqsave(shost->host_lock, flags);
2255                 rport->flags |= FC_RPORT_SCAN_PENDING;
2256                 scsi_queue_work(shost, &rport->scan_work);
2257                 spin_unlock_irqrestore(shost->host_lock, flags);
2258                 scsi_target_unblock(&rport->dev);
2259         }
2260 }
2261 EXPORT_SYMBOL(fc_remote_port_rolechg);
2262
2263 /**
2264  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
2265  *                       was a SCSI target (thus was blocked), and failed
2266  *                       to return in the alloted time.
2267  *
2268  * @work:       rport target that failed to reappear in the alloted time.
2269  **/
2270 static void
2271 fc_timeout_deleted_rport(struct work_struct *work)
2272 {
2273         struct fc_rport *rport =
2274                 container_of(work, struct fc_rport, dev_loss_work.work);
2275         struct Scsi_Host *shost = rport_to_shost(rport);
2276         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2277         unsigned long flags;
2278
2279         spin_lock_irqsave(shost->host_lock, flags);
2280
2281         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2282
2283         /*
2284          * If the port is ONLINE, then it came back. Validate it's still an
2285          * FCP target. If not, tear down the scsi_target on it.
2286          */
2287         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2288             !(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2289                 dev_printk(KERN_ERR, &rport->dev,
2290                         "blocked FC remote port time out: no longer"
2291                         " a FCP target, removing starget\n");
2292                 spin_unlock_irqrestore(shost->host_lock, flags);
2293                 scsi_target_unblock(&rport->dev);
2294                 fc_queue_work(shost, &rport->stgt_delete_work);
2295                 return;
2296         }
2297
2298         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2299                 spin_unlock_irqrestore(shost->host_lock, flags);
2300                 dev_printk(KERN_ERR, &rport->dev,
2301                         "blocked FC remote port time out: leaving target alone\n");
2302                 return;
2303         }
2304
2305         if (fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) {
2306                 list_del(&rport->peers);
2307                 rport->port_state = FC_PORTSTATE_DELETED;
2308                 dev_printk(KERN_ERR, &rport->dev,
2309                         "blocked FC remote port time out: removing target\n");
2310                 fc_queue_work(shost, &rport->rport_delete_work);
2311                 spin_unlock_irqrestore(shost->host_lock, flags);
2312                 return;
2313         }
2314
2315         dev_printk(KERN_ERR, &rport->dev,
2316                 "blocked FC remote port time out: removing target and "
2317                 "saving binding\n");
2318
2319         list_move_tail(&rport->peers, &fc_host->rport_bindings);
2320
2321         /*
2322          * Note: We do not remove or clear the hostdata area. This allows
2323          *   host-specific target data to persist along with the
2324          *   scsi_target_id. It's up to the host to manage it's hostdata area.
2325          */
2326
2327         /*
2328          * Reinitialize port attributes that may change if the port comes back.
2329          */
2330         rport->maxframe_size = -1;
2331         rport->supported_classes = FC_COS_UNSPECIFIED;
2332         rport->roles = FC_RPORT_ROLE_UNKNOWN;
2333         rport->port_state = FC_PORTSTATE_NOTPRESENT;
2334
2335         /* remove the identifiers that aren't used in the consisting binding */
2336         switch (fc_host->tgtid_bind_type) {
2337         case FC_TGTID_BIND_BY_WWPN:
2338                 rport->node_name = -1;
2339                 rport->port_id = -1;
2340                 break;
2341         case FC_TGTID_BIND_BY_WWNN:
2342                 rport->port_name = -1;
2343                 rport->port_id = -1;
2344                 break;
2345         case FC_TGTID_BIND_BY_ID:
2346                 rport->node_name = -1;
2347                 rport->port_name = -1;
2348                 break;
2349         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
2350                 break;
2351         }
2352
2353         /*
2354          * As this only occurs if the remote port (scsi target)
2355          * went away and didn't come back - we'll remove
2356          * all attached scsi devices.
2357          */
2358         spin_unlock_irqrestore(shost->host_lock, flags);
2359
2360         scsi_target_unblock(&rport->dev);
2361         fc_queue_work(shost, &rport->stgt_delete_work);
2362 }
2363
2364 /**
2365  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a
2366  *                       disconnected SCSI target.
2367  *
2368  * @work:       rport to terminate io on.
2369  *
2370  * Notes: Only requests the failure of the io, not that all are flushed
2371  *    prior to returning.
2372  **/
2373 static void
2374 fc_timeout_fail_rport_io(struct work_struct *work)
2375 {
2376         struct fc_rport *rport =
2377                 container_of(work, struct fc_rport, fail_io_work.work);
2378         struct Scsi_Host *shost = rport_to_shost(rport);
2379         struct fc_internal *i = to_fc_internal(shost->transportt);
2380
2381         if (rport->port_state != FC_PORTSTATE_BLOCKED)
2382                 return;
2383
2384         i->f->terminate_rport_io(rport);
2385 }
2386
2387 /**
2388  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
2389  *
2390  * @work:       remote port to be scanned.
2391  **/
2392 static void
2393 fc_scsi_scan_rport(struct work_struct *work)
2394 {
2395         struct fc_rport *rport =
2396                 container_of(work, struct fc_rport, scan_work);
2397         struct Scsi_Host *shost = rport_to_shost(rport);
2398         unsigned long flags;
2399
2400         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2401             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2402                 scsi_scan_target(&rport->dev, rport->channel,
2403                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
2404         }
2405
2406         spin_lock_irqsave(shost->host_lock, flags);
2407         rport->flags &= ~FC_RPORT_SCAN_PENDING;
2408         spin_unlock_irqrestore(shost->host_lock, flags);
2409 }
2410
2411
2412 MODULE_AUTHOR("Martin Hicks");
2413 MODULE_DESCRIPTION("FC Transport Attributes");
2414 MODULE_LICENSE("GPL");
2415
2416 module_init(fc_transport_init);
2417 module_exit(fc_transport_exit);