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) 2004-2007   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *    Add vports, etc
  26  *
  27  */
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_fc.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <linux/netlink.h>
  37 #include <net/netlink.h>
  38 #include <scsi/scsi_netlink_fc.h>
  39 #include <scsi/scsi_bsg_fc.h>
  40 #include "scsi_priv.h"
  41 #include "scsi_transport_fc_internal.h"
  42
  43 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  44 static void fc_vport_sched_delete(struct work_struct *work);
  45 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  46         struct device *pdev, struct fc_vport_identifiers  *ids,
  47         struct fc_vport **vport);
  48 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  49 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  50 static void fc_bsg_remove(struct request_queue *);
  51 static void fc_bsg_goose_queue(struct fc_rport *);
  52
  53 /*
  54  * Redefine so that we can have same named attributes in the
  55  * sdev/starget/host objects.
  56  */
  57 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  58 struct device_attribute device_attr_##_prefix##_##_name =       \
  59         __ATTR(_name,_mode,_show,_store)
  60
  61 #define fc_enum_name_search(title, table_type, table)                   \
  62 static const char *get_fc_##title##_name(enum table_type table_key)     \
  63 {                                                                       \
  64         int i;                                                          \
  65         char *name = NULL;                                              \
  66                                                                         \
  67         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  68                 if (table[i].value == table_key) {                      \
  69                         name = table[i].name;                           \
  70                         break;                                          \
  71                 }                                                       \
  72         }                                                               \
  73         return name;                                                    \
  74 }
  75
  76 #define fc_enum_name_match(title, table_type, table)                    \
  77 static int get_fc_##title##_match(const char *table_key,                \
  78                 enum table_type *value)                                 \
  79 {                                                                       \
  80         int i;                                                          \
  81                                                                         \
  82         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  83                 if (strncmp(table_key, table[i].name,                   \
  84                                 table[i].matchlen) == 0) {              \
  85                         *value = table[i].value;                        \
  86                         return 0; /* success */                         \
  87                 }                                                       \
  88         }                                                               \
  89         return 1; /* failure */                                         \
  90 }
  91
  92
  93 /* Convert fc_port_type values to ascii string name */
  94 static struct {
  95         enum fc_port_type       value;
  96         char                    *name;
  97 } fc_port_type_names[] = {
  98         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  99         { FC_PORTTYPE_OTHER,            "Other" },
 100         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 101         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 102         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 103         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 104         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 105         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 106 };
 107 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 108 #define FC_PORTTYPE_MAX_NAMELEN         50
 109
 110 /* Reuse fc_port_type enum function for vport_type */
 111 #define get_fc_vport_type_name get_fc_port_type_name
 112
 113
 114 /* Convert fc_host_event_code values to ascii string name */
 115 static const struct {
 116         enum fc_host_event_code         value;
 117         char                            *name;
 118 } fc_host_event_code_names[] = {
 119         { FCH_EVT_LIP,                  "lip" },
 120         { FCH_EVT_LINKUP,               "link_up" },
 121         { FCH_EVT_LINKDOWN,             "link_down" },
 122         { FCH_EVT_LIPRESET,             "lip_reset" },
 123         { FCH_EVT_RSCN,                 "rscn" },
 124         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 125         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 126         { FCH_EVT_PORT_ONLINE,          "port_online" },
 127         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 128         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 129         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 130         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 131 };
 132 fc_enum_name_search(host_event_code, fc_host_event_code,
 133                 fc_host_event_code_names)
 134 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 135
 136
 137 /* Convert fc_port_state values to ascii string name */
 138 static struct {
 139         enum fc_port_state      value;
 140         char                    *name;
 141 } fc_port_state_names[] = {
 142         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 143         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 144         { FC_PORTSTATE_ONLINE,          "Online" },
 145         { FC_PORTSTATE_OFFLINE,         "Offline" },
 146         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 147         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 148         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 149         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 150         { FC_PORTSTATE_ERROR,           "Error" },
 151         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 152         { FC_PORTSTATE_DELETED,         "Deleted" },
 153 };
 154 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 155 #define FC_PORTSTATE_MAX_NAMELEN        20
 156
 157
 158 /* Convert fc_vport_state values to ascii string name */
 159 static struct {
 160         enum fc_vport_state     value;
 161         char                    *name;
 162 } fc_vport_state_names[] = {
 163         { FC_VPORT_UNKNOWN,             "Unknown" },
 164         { FC_VPORT_ACTIVE,              "Active" },
 165         { FC_VPORT_DISABLED,            "Disabled" },
 166         { FC_VPORT_LINKDOWN,            "Linkdown" },
 167         { FC_VPORT_INITIALIZING,        "Initializing" },
 168         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 169         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 170         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 171         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 172         { FC_VPORT_FAILED,              "VPort Failed" },
 173 };
 174 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 175 #define FC_VPORTSTATE_MAX_NAMELEN       24
 176
 177 /* Reuse fc_vport_state enum function for vport_last_state */
 178 #define get_fc_vport_last_state_name get_fc_vport_state_name
 179
 180
 181 /* Convert fc_tgtid_binding_type values to ascii string name */
 182 static const struct {
 183         enum fc_tgtid_binding_type      value;
 184         char                            *name;
 185         int                             matchlen;
 186 } fc_tgtid_binding_type_names[] = {
 187         { FC_TGTID_BIND_NONE, "none", 4 },
 188         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 189         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 190         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 191 };
 192 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 193                 fc_tgtid_binding_type_names)
 194 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 195                 fc_tgtid_binding_type_names)
 196 #define FC_BINDTYPE_MAX_NAMELEN 30
 197
 198
 199 #define fc_bitfield_name_search(title, table)                   \
 200 static ssize_t                                                  \
 201 get_fc_##title##_names(u32 table_key, char *buf)                \
 202 {                                                               \
 203         char *prefix = "";                                      \
 204         ssize_t len = 0;                                        \
 205         int i;                                                  \
 206                                                                 \
 207         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 208                 if (table[i].value & table_key) {               \
 209                         len += sprintf(buf + len, "%s%s",       \
 210                                 prefix, table[i].name);         \
 211                         prefix = ", ";                          \
 212                 }                                               \
 213         }                                                       \
 214         len += sprintf(buf + len, "\n");                        \
 215         return len;                                             \
 216 }
 217
 218
 219 /* Convert FC_COS bit values to ascii string name */
 220 static const struct {
 221         u32                     value;
 222         char                    *name;
 223 } fc_cos_names[] = {
 224         { FC_COS_CLASS1,        "Class 1" },
 225         { FC_COS_CLASS2,        "Class 2" },
 226         { FC_COS_CLASS3,        "Class 3" },
 227         { FC_COS_CLASS4,        "Class 4" },
 228         { FC_COS_CLASS6,        "Class 6" },
 229 };
 230 fc_bitfield_name_search(cos, fc_cos_names)
 231
 232
 233 /* Convert FC_PORTSPEED bit values to ascii string name */
 234 static const struct {
 235         u32                     value;
 236         char                    *name;
 237 } fc_port_speed_names[] = {
 238         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 239         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 240         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 241         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 242         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 243         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 244         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 245 };
 246 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 247
 248
 249 static int
 250 show_fc_fc4s (char *buf, u8 *fc4_list)
 251 {
 252         int i, len=0;
 253
 254         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 255                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 256         len += sprintf(buf + len, "\n");
 257         return len;
 258 }
 259
 260
 261 /* Convert FC_PORT_ROLE bit values to ascii string name */
 262 static const struct {
 263         u32                     value;
 264         char                    *name;
 265 } fc_port_role_names[] = {
 266         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 267         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 268         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 269 };
 270 fc_bitfield_name_search(port_roles, fc_port_role_names)
 271
 272 /*
 273  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 274  */
 275 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 276 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 277 #define FC_FPORT_PORTID                 0x00000e
 278 #define FC_FABCTLR_PORTID               0x00000d
 279 #define FC_DIRSRVR_PORTID               0x00000c
 280 #define FC_TIMESRVR_PORTID              0x00000b
 281 #define FC_MGMTSRVR_PORTID              0x00000a
 282
 283
 284 static void fc_timeout_deleted_rport(struct work_struct *work);
 285 static void fc_timeout_fail_rport_io(struct work_struct *work);
 286 static void fc_scsi_scan_rport(struct work_struct *work);
 287
 288 /*
 289  * Attribute counts pre object type...
 290  * Increase these values if you add attributes
 291  */
 292 #define FC_STARGET_NUM_ATTRS    3
 293 #define FC_RPORT_NUM_ATTRS      10
 294 #define FC_VPORT_NUM_ATTRS      9
 295 #define FC_HOST_NUM_ATTRS       22
 296
 297 struct fc_internal {
 298         struct scsi_transport_template t;
 299         struct fc_function_template *f;
 300
 301         /*
 302          * For attributes : each object has :
 303          *   An array of the actual attributes structures
 304          *   An array of null-terminated pointers to the attribute
 305          *     structures - used for mid-layer interaction.
 306          *
 307          * The attribute containers for the starget and host are are
 308          * part of the midlayer. As the remote port is specific to the
 309          * fc transport, we must provide the attribute container.
 310          */
 311         struct device_attribute private_starget_attrs[
 312                                                         FC_STARGET_NUM_ATTRS];
 313         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 314
 315         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 316         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 317
 318         struct transport_container rport_attr_cont;
 319         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 320         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 321
 322         struct transport_container vport_attr_cont;
 323         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 324         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 325 };
 326
 327 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 328
 329 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 330                            struct device *cdev)
 331 {
 332         struct scsi_target *starget = to_scsi_target(dev);
 333         struct fc_rport *rport = starget_to_rport(starget);
 334
 335         /*
 336          * if parent is remote port, use values from remote port.
 337          * Otherwise, this host uses the fc_transport, but not the
 338          * remote port interface. As such, initialize to known non-values.
 339          */
 340         if (rport) {
 341                 fc_starget_node_name(starget) = rport->node_name;
 342                 fc_starget_port_name(starget) = rport->port_name;
 343                 fc_starget_port_id(starget) = rport->port_id;
 344         } else {
 345                 fc_starget_node_name(starget) = -1;
 346                 fc_starget_port_name(starget) = -1;
 347                 fc_starget_port_id(starget) = -1;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 354                                "fc_transport",
 355                                fc_target_setup,
 356                                NULL,
 357                                NULL);
 358
 359 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 360                          struct device *cdev)
 361 {
 362         struct Scsi_Host *shost = dev_to_shost(dev);
 363         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 364
 365         /*
 366          * Set default values easily detected by the midlayer as
 367          * failure cases.  The scsi lldd is responsible for initializing
 368          * all transport attributes to valid values per host.
 369          */
 370         fc_host->node_name = -1;
 371         fc_host->port_name = -1;
 372         fc_host->permanent_port_name = -1;
 373         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 374         memset(fc_host->supported_fc4s, 0,
 375                 sizeof(fc_host->supported_fc4s));
 376         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 377         fc_host->maxframe_size = -1;
 378         fc_host->max_npiv_vports = 0;
 379         memset(fc_host->serial_number, 0,
 380                 sizeof(fc_host->serial_number));
 381
 382         fc_host->port_id = -1;
 383         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 384         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 385         memset(fc_host->active_fc4s, 0,
 386                 sizeof(fc_host->active_fc4s));
 387         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 388         fc_host->fabric_name = -1;
 389         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 390         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 391
 392         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 393
 394         INIT_LIST_HEAD(&fc_host->rports);
 395         INIT_LIST_HEAD(&fc_host->rport_bindings);
 396         INIT_LIST_HEAD(&fc_host->vports);
 397         fc_host->next_rport_number = 0;
 398         fc_host->next_target_id = 0;
 399         fc_host->next_vport_number = 0;
 400         fc_host->npiv_vports_inuse = 0;
 401
 402         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 403                  "fc_wq_%d", shost->host_no);
 404         fc_host->work_q = create_singlethread_workqueue(
 405                                         fc_host->work_q_name);
 406         if (!fc_host->work_q)
 407                 return -ENOMEM;
 408
 409         snprintf(fc_host->devloss_work_q_name,
 410                  sizeof(fc_host->devloss_work_q_name),
 411                  "fc_dl_%d", shost->host_no);
 412         fc_host->devloss_work_q = create_singlethread_workqueue(
 413                                         fc_host->devloss_work_q_name);
 414         if (!fc_host->devloss_work_q) {
 415                 destroy_workqueue(fc_host->work_q);
 416                 fc_host->work_q = NULL;
 417                 return -ENOMEM;
 418         }
 419
 420         fc_bsg_hostadd(shost, fc_host);
 421         /* ignore any bsg add error - we just can't do sgio */
 422
 423         return 0;
 424 }
 425
 426 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 427                          struct device *cdev)
 428 {
 429         struct Scsi_Host *shost = dev_to_shost(dev);
 430         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 431
 432         fc_bsg_remove(fc_host->rqst_q);
 433         return 0;
 434 }
 435
 436 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 437                                "fc_host",
 438                                fc_host_setup,
 439                                fc_host_remove,
 440                                NULL);
 441
 442 /*
 443  * Setup and Remove actions for remote ports are handled
 444  * in the service functions below.
 445  */
 446 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 447                                "fc_remote_ports",
 448                                NULL,
 449                                NULL,
 450                                NULL);
 451
 452 /*
 453  * Setup and Remove actions for virtual ports are handled
 454  * in the service functions below.
 455  */
 456 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 457                                "fc_vports",
 458                                NULL,
 459                                NULL,
 460                                NULL);
 461
 462 /*
 463  * Module Parameters
 464  */
 465
 466 /*
 467  * dev_loss_tmo: the default number of seconds that the FC transport
 468  *   should insulate the loss of a remote port.
 469  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 470  */
 471 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 472
 473 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 474 MODULE_PARM_DESC(dev_loss_tmo,
 475                  "Maximum number of seconds that the FC transport should"
 476                  " insulate the loss of a remote port. Once this value is"
 477                  " exceeded, the scsi target is removed. Value should be"
 478                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
 479                  " fast_io_fail_tmo is not set.");
 480
 481 /*
 482  * Netlink Infrastructure
 483  */
 484
 485 static atomic_t fc_event_seq;
 486
 487 /**
 488  * fc_get_event_number - Obtain the next sequential FC event number
 489  *
 490  * Notes:
 491  *   We could have inlined this, but it would have required fc_event_seq to
 492  *   be exposed. For now, live with the subroutine call.
 493  *   Atomic used to avoid lock/unlock...
 494  */
 495 u32
 496 fc_get_event_number(void)
 497 {
 498         return atomic_add_return(1, &fc_event_seq);
 499 }
 500 EXPORT_SYMBOL(fc_get_event_number);
 501
 502
 503 /**
 504  * fc_host_post_event - called to post an even on an fc_host.
 505  * @shost:              host the event occurred on
 506  * @event_number:       fc event number obtained from get_fc_event_number()
 507  * @event_code:         fc_host event being posted
 508  * @event_data:         32bits of data for the event being posted
 509  *
 510  * Notes:
 511  *      This routine assumes no locks are held on entry.
 512  */
 513 void
 514 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 515                 enum fc_host_event_code event_code, u32 event_data)
 516 {
 517         struct sk_buff *skb;
 518         struct nlmsghdr *nlh;
 519         struct fc_nl_event *event;
 520         const char *name;
 521         u32 len, skblen;
 522         int err;
 523
 524         if (!scsi_nl_sock) {
 525                 err = -ENOENT;
 526                 goto send_fail;
 527         }
 528
 529         len = FC_NL_MSGALIGN(sizeof(*event));
 530         skblen = NLMSG_SPACE(len);
 531
 532         skb = alloc_skb(skblen, GFP_KERNEL);
 533         if (!skb) {
 534                 err = -ENOBUFS;
 535                 goto send_fail;
 536         }
 537
 538         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 539                                 skblen - sizeof(*nlh), 0);
 540         if (!nlh) {
 541                 err = -ENOBUFS;
 542                 goto send_fail_skb;
 543         }
 544         event = NLMSG_DATA(nlh);
 545
 546         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 547                                 FC_NL_ASYNC_EVENT, len);
 548         event->seconds = get_seconds();
 549         event->vendor_id = 0;
 550         event->host_no = shost->host_no;
 551         event->event_datalen = sizeof(u32);     /* bytes */
 552         event->event_num = event_number;
 553         event->event_code = event_code;
 554         event->event_data = event_data;
 555
 556         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 557                         GFP_KERNEL);
 558         return;
 559
 560 send_fail_skb:
 561         kfree_skb(skb);
 562 send_fail:
 563         name = get_fc_host_event_code_name(event_code);
 564         printk(KERN_WARNING
 565                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 566                 __func__, shost->host_no,
 567                 (name) ? name : "<unknown>", event_data, err);
 568         return;
 569 }
 570 EXPORT_SYMBOL(fc_host_post_event);
 571
 572
 573 /**
 574  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 575  * @shost:              host the event occurred on
 576  * @event_number:       fc event number obtained from get_fc_event_number()
 577  * @data_len:           amount, in bytes, of vendor unique data
 578  * @data_buf:           pointer to vendor unique data
 579  * @vendor_id:          Vendor id
 580  *
 581  * Notes:
 582  *      This routine assumes no locks are held on entry.
 583  */
 584 void
 585 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 586                 u32 data_len, char * data_buf, u64 vendor_id)
 587 {
 588         struct sk_buff *skb;
 589         struct nlmsghdr *nlh;
 590         struct fc_nl_event *event;
 591         u32 len, skblen;
 592         int err;
 593
 594         if (!scsi_nl_sock) {
 595                 err = -ENOENT;
 596                 goto send_vendor_fail;
 597         }
 598
 599         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 600         skblen = NLMSG_SPACE(len);
 601
 602         skb = alloc_skb(skblen, GFP_KERNEL);
 603         if (!skb) {
 604                 err = -ENOBUFS;
 605                 goto send_vendor_fail;
 606         }
 607
 608         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 609                                 skblen - sizeof(*nlh), 0);
 610         if (!nlh) {
 611                 err = -ENOBUFS;
 612                 goto send_vendor_fail_skb;
 613         }
 614         event = NLMSG_DATA(nlh);
 615
 616         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 617                                 FC_NL_ASYNC_EVENT, len);
 618         event->seconds = get_seconds();
 619         event->vendor_id = vendor_id;
 620         event->host_no = shost->host_no;
 621         event->event_datalen = data_len;        /* bytes */
 622         event->event_num = event_number;
 623         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 624         memcpy(&event->event_data, data_buf, data_len);
 625
 626         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 627                         GFP_KERNEL);
 628         return;
 629
 630 send_vendor_fail_skb:
 631         kfree_skb(skb);
 632 send_vendor_fail:
 633         printk(KERN_WARNING
 634                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 635                 __func__, shost->host_no, err);
 636         return;
 637 }
 638 EXPORT_SYMBOL(fc_host_post_vendor_event);
 639
 640
 641
 642 static __init int fc_transport_init(void)
 643 {
 644         int error;
 645
 646         atomic_set(&fc_event_seq, 0);
 647
 648         error = transport_class_register(&fc_host_class);
 649         if (error)
 650                 return error;
 651         error = transport_class_register(&fc_vport_class);
 652         if (error)
 653                 goto unreg_host_class;
 654         error = transport_class_register(&fc_rport_class);
 655         if (error)
 656                 goto unreg_vport_class;
 657         error = transport_class_register(&fc_transport_class);
 658         if (error)
 659                 goto unreg_rport_class;
 660         return 0;
 661
 662 unreg_rport_class:
 663         transport_class_unregister(&fc_rport_class);
 664 unreg_vport_class:
 665         transport_class_unregister(&fc_vport_class);
 666 unreg_host_class:
 667         transport_class_unregister(&fc_host_class);
 668         return error;
 669 }
 670
 671 static void __exit fc_transport_exit(void)
 672 {
 673         transport_class_unregister(&fc_transport_class);
 674         transport_class_unregister(&fc_rport_class);
 675         transport_class_unregister(&fc_host_class);
 676         transport_class_unregister(&fc_vport_class);
 677 }
 678
 679 /*
 680  * FC Remote Port Attribute Management
 681  */
 682
 683 #define fc_rport_show_function(field, format_string, sz, cast)          \
 684 static ssize_t                                                          \
 685 show_fc_rport_##field (struct device *dev,                              \
 686                        struct device_attribute *attr, char *buf)        \
 687 {                                                                       \
 688         struct fc_rport *rport = transport_class_to_rport(dev);         \
 689         struct Scsi_Host *shost = rport_to_shost(rport);                \
 690         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 691         if ((i->f->get_rport_##field) &&                                \
 692             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 693               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 694               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 695                 i->f->get_rport_##field(rport);                         \
 696         return snprintf(buf, sz, format_string, cast rport->field);     \
 697 }
 698
 699 #define fc_rport_store_function(field)                                  \
 700 static ssize_t                                                          \
 701 store_fc_rport_##field(struct device *dev,                              \
 702                        struct device_attribute *attr,                   \
 703                        const char *buf, size_t count)                   \
 704 {                                                                       \
 705         int val;                                                        \
 706         struct fc_rport *rport = transport_class_to_rport(dev);         \
 707         struct Scsi_Host *shost = rport_to_shost(rport);                \
 708         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 709         char *cp;                                                       \
 710         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 711             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 712             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 713                 return -EBUSY;                                          \
 714         val = simple_strtoul(buf, &cp, 0);                              \
 715         if (*cp && (*cp != '\n'))                                       \
 716                 return -EINVAL;                                         \
 717         i->f->set_rport_##field(rport, val);                            \
 718         return count;                                                   \
 719 }
 720
 721 #define fc_rport_rd_attr(field, format_string, sz)                      \
 722         fc_rport_show_function(field, format_string, sz, )              \
 723 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 724                          show_fc_rport_##field, NULL)
 725
 726 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 727         fc_rport_show_function(field, format_string, sz, (cast))        \
 728 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 729                           show_fc_rport_##field, NULL)
 730
 731 #define fc_rport_rw_attr(field, format_string, sz)                      \
 732         fc_rport_show_function(field, format_string, sz, )              \
 733         fc_rport_store_function(field)                                  \
 734 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 735                         show_fc_rport_##field,                          \
 736                         store_fc_rport_##field)
 737
 738
 739 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 740 static ssize_t                                                          \
 741 show_fc_rport_##field (struct device *dev,                              \
 742                        struct device_attribute *attr, char *buf)        \
 743 {                                                                       \
 744         struct fc_rport *rport = transport_class_to_rport(dev);         \
 745         return snprintf(buf, sz, format_string, cast rport->field);     \
 746 }
 747
 748 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 749         fc_private_rport_show_function(field, format_string, sz, )      \
 750 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 751                          show_fc_rport_##field, NULL)
 752
 753 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 754         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 755 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 756                           show_fc_rport_##field, NULL)
 757
 758
 759 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 760 static ssize_t                                                          \
 761 show_fc_rport_##title (struct device *dev,                              \
 762                        struct device_attribute *attr, char *buf)        \
 763 {                                                                       \
 764         struct fc_rport *rport = transport_class_to_rport(dev);         \
 765         const char *name;                                               \
 766         name = get_fc_##title##_name(rport->title);                     \
 767         if (!name)                                                      \
 768                 return -EINVAL;                                         \
 769         return snprintf(buf, maxlen, "%s\n", name);                     \
 770 }                                                                       \
 771 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 772                         show_fc_rport_##title, NULL)
 773
 774
 775 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 776         i->private_rport_attrs[count] = device_attr_rport_##field; \
 777         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 778         i->private_rport_attrs[count].store = NULL;                     \
 779         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 780         if (i->f->show_rport_##field)                                   \
 781                 count++
 782
 783 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 784         i->private_rport_attrs[count] = device_attr_rport_##field; \
 785         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 786         i->private_rport_attrs[count].store = NULL;                     \
 787         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 788         count++
 789
 790 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 791         i->private_rport_attrs[count] = device_attr_rport_##field; \
 792         if (!i->f->set_rport_##field) {                                 \
 793                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 794                 i->private_rport_attrs[count].store = NULL;             \
 795         }                                                               \
 796         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 797         if (i->f->show_rport_##field)                                   \
 798                 count++
 799
 800 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 801 {                                                                       \
 802         i->private_rport_attrs[count] = device_attr_rport_##field; \
 803         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 804         count++;                                                        \
 805 }
 806
 807
 808 /* The FC Transport Remote Port Attributes: */
 809
 810 /* Fixed Remote Port Attributes */
 811
 812 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 813
 814 static ssize_t
 815 show_fc_rport_supported_classes (struct device *dev,
 816                                  struct device_attribute *attr, char *buf)
 817 {
 818         struct fc_rport *rport = transport_class_to_rport(dev);
 819         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 820                 return snprintf(buf, 20, "unspecified\n");
 821         return get_fc_cos_names(rport->supported_classes, buf);
 822 }
 823 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 824                 show_fc_rport_supported_classes, NULL);
 825
 826 /* Dynamic Remote Port Attributes */
 827
 828 /*
 829  * dev_loss_tmo attribute
 830  */
 831 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 832 static ssize_t
 833 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 834                             const char *buf, size_t count)
 835 {
 836         int val;
 837         struct fc_rport *rport = transport_class_to_rport(dev);
 838         struct Scsi_Host *shost = rport_to_shost(rport);
 839         struct fc_internal *i = to_fc_internal(shost->transportt);
 840         char *cp;
 841         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 842             (rport->port_state == FC_PORTSTATE_DELETED) ||
 843             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 844                 return -EBUSY;
 845         val = simple_strtoul(buf, &cp, 0);
 846         if ((*cp && (*cp != '\n')) || (val < 0))
 847                 return -EINVAL;
 848
 849         /*
 850          * If fast_io_fail is off we have to cap
 851          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
 852          */
 853         if (rport->fast_io_fail_tmo == -1 &&
 854             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
 855                 return -EINVAL;
 856
 857         i->f->set_rport_dev_loss_tmo(rport, val);
 858         return count;
 859 }
 860 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 861                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 862
 863
 864 /* Private Remote Port Attributes */
 865
 866 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 867 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 868 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 869
 870 static ssize_t
 871 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 872                      char *buf)
 873 {
 874         struct fc_rport *rport = transport_class_to_rport(dev);
 875
 876         /* identify any roles that are port_id specific */
 877         if ((rport->port_id != -1) &&
 878             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 879                                         FC_WELLKNOWN_PORTID_MASK) {
 880                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 881                 case FC_FPORT_PORTID:
 882                         return snprintf(buf, 30, "Fabric Port\n");
 883                 case FC_FABCTLR_PORTID:
 884                         return snprintf(buf, 30, "Fabric Controller\n");
 885                 case FC_DIRSRVR_PORTID:
 886                         return snprintf(buf, 30, "Directory Server\n");
 887                 case FC_TIMESRVR_PORTID:
 888                         return snprintf(buf, 30, "Time Server\n");
 889                 case FC_MGMTSRVR_PORTID:
 890                         return snprintf(buf, 30, "Management Server\n");
 891                 default:
 892                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 893                 }
 894         } else {
 895                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 896                         return snprintf(buf, 20, "unknown\n");
 897                 return get_fc_port_roles_names(rport->roles, buf);
 898         }
 899 }
 900 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 901                 show_fc_rport_roles, NULL);
 902
 903 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 904 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 905
 906 /*
 907  * fast_io_fail_tmo attribute
 908  */
 909 static ssize_t
 910 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 911                                 struct device_attribute *attr, char *buf)
 912 {
 913         struct fc_rport *rport = transport_class_to_rport(dev);
 914
 915         if (rport->fast_io_fail_tmo == -1)
 916                 return snprintf(buf, 5, "off\n");
 917         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 918 }
 919
 920 static ssize_t
 921 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 922                                 struct device_attribute *attr, const char *buf,
 923                                 size_t count)
 924 {
 925         int val;
 926         char *cp;
 927         struct fc_rport *rport = transport_class_to_rport(dev);
 928
 929         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 930             (rport->port_state == FC_PORTSTATE_DELETED) ||
 931             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 932                 return -EBUSY;
 933         if (strncmp(buf, "off", 3) == 0)
 934                 rport->fast_io_fail_tmo = -1;
 935         else {
 936                 val = simple_strtoul(buf, &cp, 0);
 937                 if ((*cp && (*cp != '\n')) || (val < 0))
 938                         return -EINVAL;
 939                 /*
 940                  * Cap fast_io_fail by dev_loss_tmo or
 941                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 942                  */
 943                 if ((val >= rport->dev_loss_tmo) ||
 944                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 945                         return -EINVAL;
 946
 947                 rport->fast_io_fail_tmo = val;
 948         }
 949         return count;
 950 }
 951 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 952         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 953
 954
 955 /*
 956  * FC SCSI Target Attribute Management
 957  */
 958
 959 /*
 960  * Note: in the target show function we recognize when the remote
 961  *  port is in the heirarchy and do not allow the driver to get
 962  *  involved in sysfs functions. The driver only gets involved if
 963  *  it's the "old" style that doesn't use rports.
 964  */
 965 #define fc_starget_show_function(field, format_string, sz, cast)        \
 966 static ssize_t                                                          \
 967 show_fc_starget_##field (struct device *dev,                            \
 968                          struct device_attribute *attr, char *buf)      \
 969 {                                                                       \
 970         struct scsi_target *starget = transport_class_to_starget(dev);  \
 971         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 972         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 973         struct fc_rport *rport = starget_to_rport(starget);             \
 974         if (rport)                                                      \
 975                 fc_starget_##field(starget) = rport->field;             \
 976         else if (i->f->get_starget_##field)                             \
 977                 i->f->get_starget_##field(starget);                     \
 978         return snprintf(buf, sz, format_string,                         \
 979                 cast fc_starget_##field(starget));                      \
 980 }
 981
 982 #define fc_starget_rd_attr(field, format_string, sz)                    \
 983         fc_starget_show_function(field, format_string, sz, )            \
 984 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 985                          show_fc_starget_##field, NULL)
 986
 987 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 988         fc_starget_show_function(field, format_string, sz, (cast))      \
 989 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 990                           show_fc_starget_##field, NULL)
 991
 992 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 993         i->private_starget_attrs[count] = device_attr_starget_##field; \
 994         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 995         i->private_starget_attrs[count].store = NULL;                   \
 996         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 997         if (i->f->show_starget_##field)                                 \
 998                 count++
 999
1000 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1001         i->private_starget_attrs[count] = device_attr_starget_##field; \
1002         if (!i->f->set_starget_##field) {                               \
1003                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1004                 i->private_starget_attrs[count].store = NULL;           \
1005         }                                                               \
1006         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1007         if (i->f->show_starget_##field)                                 \
1008                 count++
1009
1010 /* The FC Transport SCSI Target Attributes: */
1011 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1012 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1013 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1014
1015
1016 /*
1017  * FC Virtual Port Attribute Management
1018  */
1019
1020 #define fc_vport_show_function(field, format_string, sz, cast)          \
1021 static ssize_t                                                          \
1022 show_fc_vport_##field (struct device *dev,                              \
1023                        struct device_attribute *attr, char *buf)        \
1024 {                                                                       \
1025         struct fc_vport *vport = transport_class_to_vport(dev);         \
1026         struct Scsi_Host *shost = vport_to_shost(vport);                \
1027         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1028         if ((i->f->get_vport_##field) &&                                \
1029             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1030                 i->f->get_vport_##field(vport);                         \
1031         return snprintf(buf, sz, format_string, cast vport->field);     \
1032 }
1033
1034 #define fc_vport_store_function(field)                                  \
1035 static ssize_t                                                          \
1036 store_fc_vport_##field(struct device *dev,                              \
1037                        struct device_attribute *attr,                   \
1038                        const char *buf, size_t count)                   \
1039 {                                                                       \
1040         int val;                                                        \
1041         struct fc_vport *vport = transport_class_to_vport(dev);         \
1042         struct Scsi_Host *shost = vport_to_shost(vport);                \
1043         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1044         char *cp;                                                       \
1045         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1046                 return -EBUSY;                                          \
1047         val = simple_strtoul(buf, &cp, 0);                              \
1048         if (*cp && (*cp != '\n'))                                       \
1049                 return -EINVAL;                                         \
1050         i->f->set_vport_##field(vport, val);                            \
1051         return count;                                                   \
1052 }
1053
1054 #define fc_vport_store_str_function(field, slen)                        \
1055 static ssize_t                                                          \
1056 store_fc_vport_##field(struct device *dev,                              \
1057                        struct device_attribute *attr,                   \
1058                        const char *buf, size_t count)                   \
1059 {                                                                       \
1060         struct fc_vport *vport = transport_class_to_vport(dev);         \
1061         struct Scsi_Host *shost = vport_to_shost(vport);                \
1062         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1063         unsigned int cnt=count;                                         \
1064                                                                         \
1065         /* count may include a LF at end of string */                   \
1066         if (buf[cnt-1] == '\n')                                         \
1067                 cnt--;                                                  \
1068         if (cnt > ((slen) - 1))                                         \
1069                 return -EINVAL;                                         \
1070         memcpy(vport->field, buf, cnt);                                 \
1071         i->f->set_vport_##field(vport);                                 \
1072         return count;                                                   \
1073 }
1074
1075 #define fc_vport_rd_attr(field, format_string, sz)                      \
1076         fc_vport_show_function(field, format_string, sz, )              \
1077 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1078                          show_fc_vport_##field, NULL)
1079
1080 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1081         fc_vport_show_function(field, format_string, sz, (cast))        \
1082 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1083                           show_fc_vport_##field, NULL)
1084
1085 #define fc_vport_rw_attr(field, format_string, sz)                      \
1086         fc_vport_show_function(field, format_string, sz, )              \
1087         fc_vport_store_function(field)                                  \
1088 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1089                         show_fc_vport_##field,                          \
1090                         store_fc_vport_##field)
1091
1092 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1093 static ssize_t                                                          \
1094 show_fc_vport_##field (struct device *dev,                              \
1095                        struct device_attribute *attr, char *buf)        \
1096 {                                                                       \
1097         struct fc_vport *vport = transport_class_to_vport(dev);         \
1098         return snprintf(buf, sz, format_string, cast vport->field);     \
1099 }
1100
1101 #define fc_private_vport_store_u32_function(field)                      \
1102 static ssize_t                                                          \
1103 store_fc_vport_##field(struct device *dev,                              \
1104                        struct device_attribute *attr,                   \
1105                        const char *buf, size_t count)                   \
1106 {                                                                       \
1107         u32 val;                                                        \
1108         struct fc_vport *vport = transport_class_to_vport(dev);         \
1109         char *cp;                                                       \
1110         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1111                 return -EBUSY;                                          \
1112         val = simple_strtoul(buf, &cp, 0);                              \
1113         if (*cp && (*cp != '\n'))                                       \
1114                 return -EINVAL;                                         \
1115         vport->field = val;                                             \
1116         return count;                                                   \
1117 }
1118
1119
1120 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1121         fc_private_vport_show_function(field, format_string, sz, )      \
1122 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1123                          show_fc_vport_##field, NULL)
1124
1125 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1126         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1127 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1128                           show_fc_vport_##field, NULL)
1129
1130 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1131         fc_private_vport_show_function(field, format_string, sz, )      \
1132         fc_private_vport_store_u32_function(field)                      \
1133 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1134                         show_fc_vport_##field,                          \
1135                         store_fc_vport_##field)
1136
1137
1138 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1139 static ssize_t                                                          \
1140 show_fc_vport_##title (struct device *dev,                              \
1141                        struct device_attribute *attr,                   \
1142                        char *buf)                                       \
1143 {                                                                       \
1144         struct fc_vport *vport = transport_class_to_vport(dev);         \
1145         const char *name;                                               \
1146         name = get_fc_##title##_name(vport->title);                     \
1147         if (!name)                                                      \
1148                 return -EINVAL;                                         \
1149         return snprintf(buf, maxlen, "%s\n", name);                     \
1150 }                                                                       \
1151 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1152                         show_fc_vport_##title, NULL)
1153
1154
1155 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1156         i->private_vport_attrs[count] = device_attr_vport_##field; \
1157         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1158         i->private_vport_attrs[count].store = NULL;                     \
1159         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1160         if (i->f->get_##field)                                          \
1161                 count++
1162         /* NOTE: Above MACRO differs: checks function not show bit */
1163
1164 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1165         i->private_vport_attrs[count] = device_attr_vport_##field; \
1166         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1167         i->private_vport_attrs[count].store = NULL;                     \
1168         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1169         count++
1170
1171 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1172         i->private_vport_attrs[count] = device_attr_vport_##field; \
1173         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1174         if (i->f->field)                                                \
1175                 count++
1176         /* NOTE: Above MACRO differs: checks function */
1177
1178 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1179         i->private_vport_attrs[count] = device_attr_vport_##field; \
1180         if (!i->f->set_vport_##field) {                                 \
1181                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1182                 i->private_vport_attrs[count].store = NULL;             \
1183         }                                                               \
1184         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1185         count++
1186         /* NOTE: Above MACRO differs: does not check show bit */
1187
1188 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1189 {                                                                       \
1190         i->private_vport_attrs[count] = device_attr_vport_##field; \
1191         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1192         count++;                                                        \
1193 }
1194
1195
1196 /* The FC Transport Virtual Port Attributes: */
1197
1198 /* Fixed Virtual Port Attributes */
1199
1200 /* Dynamic Virtual Port Attributes */
1201
1202 /* Private Virtual Port Attributes */
1203
1204 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1205 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1206 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1207 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1208
1209 static ssize_t
1210 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1211                      char *buf)
1212 {
1213         struct fc_vport *vport = transport_class_to_vport(dev);
1214
1215         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1216                 return snprintf(buf, 20, "unknown\n");
1217         return get_fc_port_roles_names(vport->roles, buf);
1218 }
1219 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1220
1221 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1222
1223 fc_private_vport_show_function(symbolic_name, "%s\n",
1224                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1225 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1226 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1227                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1228
1229 static ssize_t
1230 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1231                       const char *buf, size_t count)
1232 {
1233         struct fc_vport *vport = transport_class_to_vport(dev);
1234         struct Scsi_Host *shost = vport_to_shost(vport);
1235
1236         fc_queue_work(shost, &vport->vport_delete_work);
1237         return count;
1238 }
1239 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1240                         NULL, store_fc_vport_delete);
1241
1242
1243 /*
1244  * Enable/Disable vport
1245  *  Write "1" to disable, write "0" to enable
1246  */
1247 static ssize_t
1248 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1249                        const char *buf,
1250                            size_t count)
1251 {
1252         struct fc_vport *vport = transport_class_to_vport(dev);
1253         struct Scsi_Host *shost = vport_to_shost(vport);
1254         struct fc_internal *i = to_fc_internal(shost->transportt);
1255         int stat;
1256
1257         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1258                 return -EBUSY;
1259
1260         if (*buf == '0') {
1261                 if (vport->vport_state != FC_VPORT_DISABLED)
1262                         return -EALREADY;
1263         } else if (*buf == '1') {
1264                 if (vport->vport_state == FC_VPORT_DISABLED)
1265                         return -EALREADY;
1266         } else
1267                 return -EINVAL;
1268
1269         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1270         return stat ? stat : count;
1271 }
1272 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1273                         NULL, store_fc_vport_disable);
1274
1275
1276 /*
1277  * Host Attribute Management
1278  */
1279
1280 #define fc_host_show_function(field, format_string, sz, cast)           \
1281 static ssize_t                                                          \
1282 show_fc_host_##field (struct device *dev,                               \
1283                       struct device_attribute *attr, char *buf)         \
1284 {                                                                       \
1285         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1286         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1287         if (i->f->get_host_##field)                                     \
1288                 i->f->get_host_##field(shost);                          \
1289         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1290 }
1291
1292 #define fc_host_store_function(field)                                   \
1293 static ssize_t                                                          \
1294 store_fc_host_##field(struct device *dev,                               \
1295                       struct device_attribute *attr,                    \
1296                       const char *buf,  size_t count)                   \
1297 {                                                                       \
1298         int val;                                                        \
1299         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1300         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1301         char *cp;                                                       \
1302                                                                         \
1303         val = simple_strtoul(buf, &cp, 0);                              \
1304         if (*cp && (*cp != '\n'))                                       \
1305                 return -EINVAL;                                         \
1306         i->f->set_host_##field(shost, val);                             \
1307         return count;                                                   \
1308 }
1309
1310 #define fc_host_store_str_function(field, slen)                         \
1311 static ssize_t                                                          \
1312 store_fc_host_##field(struct device *dev,                               \
1313                       struct device_attribute *attr,                    \
1314                       const char *buf, size_t count)                    \
1315 {                                                                       \
1316         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1317         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1318         unsigned int cnt=count;                                         \
1319                                                                         \
1320         /* count may include a LF at end of string */                   \
1321         if (buf[cnt-1] == '\n')                                         \
1322                 cnt--;                                                  \
1323         if (cnt > ((slen) - 1))                                         \
1324                 return -EINVAL;                                         \
1325         memcpy(fc_host_##field(shost), buf, cnt);                       \
1326         i->f->set_host_##field(shost);                                  \
1327         return count;                                                   \
1328 }
1329
1330 #define fc_host_rd_attr(field, format_string, sz)                       \
1331         fc_host_show_function(field, format_string, sz, )               \
1332 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1333                          show_fc_host_##field, NULL)
1334
1335 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1336         fc_host_show_function(field, format_string, sz, (cast))         \
1337 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1338                           show_fc_host_##field, NULL)
1339
1340 #define fc_host_rw_attr(field, format_string, sz)                       \
1341         fc_host_show_function(field, format_string, sz, )               \
1342         fc_host_store_function(field)                                   \
1343 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1344                         show_fc_host_##field,                           \
1345                         store_fc_host_##field)
1346
1347 #define fc_host_rd_enum_attr(title, maxlen)                             \
1348 static ssize_t                                                          \
1349 show_fc_host_##title (struct device *dev,                               \
1350                       struct device_attribute *attr, char *buf)         \
1351 {                                                                       \
1352         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1353         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1354         const char *name;                                               \
1355         if (i->f->get_host_##title)                                     \
1356                 i->f->get_host_##title(shost);                          \
1357         name = get_fc_##title##_name(fc_host_##title(shost));           \
1358         if (!name)                                                      \
1359                 return -EINVAL;                                         \
1360         return snprintf(buf, maxlen, "%s\n", name);                     \
1361 }                                                                       \
1362 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1363
1364 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1365         i->private_host_attrs[count] = device_attr_host_##field;        \
1366         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1367         i->private_host_attrs[count].store = NULL;                      \
1368         i->host_attrs[count] = &i->private_host_attrs[count];           \
1369         if (i->f->show_host_##field)                                    \
1370                 count++
1371
1372 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1373         i->private_host_attrs[count] = device_attr_host_##field;        \
1374         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1375         i->private_host_attrs[count].store = NULL;                      \
1376         i->host_attrs[count] = &i->private_host_attrs[count];           \
1377         count++
1378
1379 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1380         i->private_host_attrs[count] = device_attr_host_##field;        \
1381         if (!i->f->set_host_##field) {                                  \
1382                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1383                 i->private_host_attrs[count].store = NULL;              \
1384         }                                                               \
1385         i->host_attrs[count] = &i->private_host_attrs[count];           \
1386         if (i->f->show_host_##field)                                    \
1387                 count++
1388
1389
1390 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1391 static ssize_t                                                          \
1392 show_fc_host_##field (struct device *dev,                               \
1393                       struct device_attribute *attr, char *buf)         \
1394 {                                                                       \
1395         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1396         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1397 }
1398
1399 #define fc_private_host_rd_attr(field, format_string, sz)               \
1400         fc_private_host_show_function(field, format_string, sz, )       \
1401 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1402                          show_fc_host_##field, NULL)
1403
1404 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1405         fc_private_host_show_function(field, format_string, sz, (cast)) \
1406 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1407                           show_fc_host_##field, NULL)
1408
1409 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1410         i->private_host_attrs[count] = device_attr_host_##field;        \
1411         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1412         i->private_host_attrs[count].store = NULL;                      \
1413         i->host_attrs[count] = &i->private_host_attrs[count];           \
1414         count++
1415
1416 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1417 {                                                                       \
1418         i->private_host_attrs[count] = device_attr_host_##field;        \
1419         i->host_attrs[count] = &i->private_host_attrs[count];           \
1420         count++;                                                        \
1421 }
1422
1423
1424 /* Fixed Host Attributes */
1425
1426 static ssize_t
1427 show_fc_host_supported_classes (struct device *dev,
1428                                 struct device_attribute *attr, char *buf)
1429 {
1430         struct Scsi_Host *shost = transport_class_to_shost(dev);
1431
1432         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1433                 return snprintf(buf, 20, "unspecified\n");
1434
1435         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1436 }
1437 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1438                 show_fc_host_supported_classes, NULL);
1439
1440 static ssize_t
1441 show_fc_host_supported_fc4s (struct device *dev,
1442                              struct device_attribute *attr, char *buf)
1443 {
1444         struct Scsi_Host *shost = transport_class_to_shost(dev);
1445         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1446 }
1447 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1448                 show_fc_host_supported_fc4s, NULL);
1449
1450 static ssize_t
1451 show_fc_host_supported_speeds (struct device *dev,
1452                                struct device_attribute *attr, char *buf)
1453 {
1454         struct Scsi_Host *shost = transport_class_to_shost(dev);
1455
1456         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1457                 return snprintf(buf, 20, "unknown\n");
1458
1459         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1460 }
1461 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1462                 show_fc_host_supported_speeds, NULL);
1463
1464
1465 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1466 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1467 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1468                              unsigned long long);
1469 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1470 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1471 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1472
1473
1474 /* Dynamic Host Attributes */
1475
1476 static ssize_t
1477 show_fc_host_active_fc4s (struct device *dev,
1478                           struct device_attribute *attr, char *buf)
1479 {
1480         struct Scsi_Host *shost = transport_class_to_shost(dev);
1481         struct fc_internal *i = to_fc_internal(shost->transportt);
1482
1483         if (i->f->get_host_active_fc4s)
1484                 i->f->get_host_active_fc4s(shost);
1485
1486         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1487 }
1488 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1489                 show_fc_host_active_fc4s, NULL);
1490
1491 static ssize_t
1492 show_fc_host_speed (struct device *dev,
1493                     struct device_attribute *attr, char *buf)
1494 {
1495         struct Scsi_Host *shost = transport_class_to_shost(dev);
1496         struct fc_internal *i = to_fc_internal(shost->transportt);
1497
1498         if (i->f->get_host_speed)
1499                 i->f->get_host_speed(shost);
1500
1501         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1502                 return snprintf(buf, 20, "unknown\n");
1503
1504         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1505 }
1506 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1507                 show_fc_host_speed, NULL);
1508
1509
1510 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1511 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1512 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1513 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1514 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1515
1516 fc_private_host_show_function(system_hostname, "%s\n",
1517                 FC_SYMBOLIC_NAME_SIZE + 1, )
1518 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1519 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1520                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1521
1522
1523 /* Private Host Attributes */
1524
1525 static ssize_t
1526 show_fc_private_host_tgtid_bind_type(struct device *dev,
1527                                      struct device_attribute *attr, char *buf)
1528 {
1529         struct Scsi_Host *shost = transport_class_to_shost(dev);
1530         const char *name;
1531
1532         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1533         if (!name)
1534                 return -EINVAL;
1535         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1536 }
1537
1538 #define get_list_head_entry(pos, head, member)          \
1539         pos = list_entry((head)->next, typeof(*pos), member)
1540
1541 static ssize_t
1542 store_fc_private_host_tgtid_bind_type(struct device *dev,
1543         struct device_attribute *attr, const char *buf, size_t count)
1544 {
1545         struct Scsi_Host *shost = transport_class_to_shost(dev);
1546         struct fc_rport *rport;
1547         enum fc_tgtid_binding_type val;
1548         unsigned long flags;
1549
1550         if (get_fc_tgtid_bind_type_match(buf, &val))
1551                 return -EINVAL;
1552
1553         /* if changing bind type, purge all unused consistent bindings */
1554         if (val != fc_host_tgtid_bind_type(shost)) {
1555                 spin_lock_irqsave(shost->host_lock, flags);
1556                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1557                         get_list_head_entry(rport,
1558                                 &fc_host_rport_bindings(shost), peers);
1559                         list_del(&rport->peers);
1560                         rport->port_state = FC_PORTSTATE_DELETED;
1561                         fc_queue_work(shost, &rport->rport_delete_work);
1562                 }
1563                 spin_unlock_irqrestore(shost->host_lock, flags);
1564         }
1565
1566         fc_host_tgtid_bind_type(shost) = val;
1567         return count;
1568 }
1569
1570 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1571                         show_fc_private_host_tgtid_bind_type,
1572                         store_fc_private_host_tgtid_bind_type);
1573
1574 static ssize_t
1575 store_fc_private_host_issue_lip(struct device *dev,
1576         struct device_attribute *attr, const char *buf, size_t count)
1577 {
1578         struct Scsi_Host *shost = transport_class_to_shost(dev);
1579         struct fc_internal *i = to_fc_internal(shost->transportt);
1580         int ret;
1581
1582         /* ignore any data value written to the attribute */
1583         if (i->f->issue_fc_host_lip) {
1584                 ret = i->f->issue_fc_host_lip(shost);
1585                 return ret ? ret: count;
1586         }
1587
1588         return -ENOENT;
1589 }
1590
1591 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1592                         store_fc_private_host_issue_lip);
1593
1594 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1595
1596
1597 /*
1598  * Host Statistics Management
1599  */
1600
1601 /* Show a given an attribute in the statistics group */
1602 static ssize_t
1603 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1604 {
1605         struct Scsi_Host *shost = transport_class_to_shost(dev);
1606         struct fc_internal *i = to_fc_internal(shost->transportt);
1607         struct fc_host_statistics *stats;
1608         ssize_t ret = -ENOENT;
1609
1610         if (offset > sizeof(struct fc_host_statistics) ||
1611             offset % sizeof(u64) != 0)
1612                 WARN_ON(1);
1613
1614         if (i->f->get_fc_host_stats) {
1615                 stats = (i->f->get_fc_host_stats)(shost);
1616                 if (stats)
1617                         ret = snprintf(buf, 20, "0x%llx\n",
1618                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1619         }
1620         return ret;
1621 }
1622
1623
1624 /* generate a read-only statistics attribute */
1625 #define fc_host_statistic(name)                                         \
1626 static ssize_t show_fcstat_##name(struct device *cd,                    \
1627                                   struct device_attribute *attr,        \
1628                                   char *buf)                            \
1629 {                                                                       \
1630         return fc_stat_show(cd, buf,                                    \
1631                             offsetof(struct fc_host_statistics, name)); \
1632 }                                                                       \
1633 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1634
1635 fc_host_statistic(seconds_since_last_reset);
1636 fc_host_statistic(tx_frames);
1637 fc_host_statistic(tx_words);
1638 fc_host_statistic(rx_frames);
1639 fc_host_statistic(rx_words);
1640 fc_host_statistic(lip_count);
1641 fc_host_statistic(nos_count);
1642 fc_host_statistic(error_frames);
1643 fc_host_statistic(dumped_frames);
1644 fc_host_statistic(link_failure_count);
1645 fc_host_statistic(loss_of_sync_count);
1646 fc_host_statistic(loss_of_signal_count);
1647 fc_host_statistic(prim_seq_protocol_err_count);
1648 fc_host_statistic(invalid_tx_word_count);
1649 fc_host_statistic(invalid_crc_count);
1650 fc_host_statistic(fcp_input_requests);
1651 fc_host_statistic(fcp_output_requests);
1652 fc_host_statistic(fcp_control_requests);
1653 fc_host_statistic(fcp_input_megabytes);
1654 fc_host_statistic(fcp_output_megabytes);
1655
1656 static ssize_t
1657 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1658                     const char *buf, size_t count)
1659 {
1660         struct Scsi_Host *shost = transport_class_to_shost(dev);
1661         struct fc_internal *i = to_fc_internal(shost->transportt);
1662
1663         /* ignore any data value written to the attribute */
1664         if (i->f->reset_fc_host_stats) {
1665                 i->f->reset_fc_host_stats(shost);
1666                 return count;
1667         }
1668
1669         return -ENOENT;
1670 }
1671 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1672                                 fc_reset_statistics);
1673
1674 static struct attribute *fc_statistics_attrs[] = {
1675         &device_attr_host_seconds_since_last_reset.attr,
1676         &device_attr_host_tx_frames.attr,
1677         &device_attr_host_tx_words.attr,
1678         &device_attr_host_rx_frames.attr,
1679         &device_attr_host_rx_words.attr,
1680         &device_attr_host_lip_count.attr,
1681         &device_attr_host_nos_count.attr,
1682         &device_attr_host_error_frames.attr,
1683         &device_attr_host_dumped_frames.attr,
1684         &device_attr_host_link_failure_count.attr,
1685         &device_attr_host_loss_of_sync_count.attr,
1686         &device_attr_host_loss_of_signal_count.attr,
1687         &device_attr_host_prim_seq_protocol_err_count.attr,
1688         &device_attr_host_invalid_tx_word_count.attr,
1689         &device_attr_host_invalid_crc_count.attr,
1690         &device_attr_host_fcp_input_requests.attr,
1691         &device_attr_host_fcp_output_requests.attr,
1692         &device_attr_host_fcp_control_requests.attr,
1693         &device_attr_host_fcp_input_megabytes.attr,
1694         &device_attr_host_fcp_output_megabytes.attr,
1695         &device_attr_host_reset_statistics.attr,
1696         NULL
1697 };
1698
1699 static struct attribute_group fc_statistics_group = {
1700         .name = "statistics",
1701         .attrs = fc_statistics_attrs,
1702 };
1703
1704
1705 /* Host Vport Attributes */
1706
1707 static int
1708 fc_parse_wwn(const char *ns, u64 *nm)
1709 {
1710         unsigned int i, j;
1711         u8 wwn[8];
1712
1713         memset(wwn, 0, sizeof(wwn));
1714
1715         /* Validate and store the new name */
1716         for (i=0, j=0; i < 16; i++) {
1717                 if ((*ns >= 'a') && (*ns <= 'f'))
1718                         j = ((j << 4) | ((*ns++ -'a') + 10));
1719                 else if ((*ns >= 'A') && (*ns <= 'F'))
1720                         j = ((j << 4) | ((*ns++ -'A') + 10));
1721                 else if ((*ns >= '0') && (*ns <= '9'))
1722                         j = ((j << 4) | (*ns++ -'0'));
1723                 else
1724                         return -EINVAL;
1725                 if (i % 2) {
1726                         wwn[i/2] = j & 0xff;
1727                         j = 0;
1728                 }
1729         }
1730
1731         *nm = wwn_to_u64(wwn);
1732
1733         return 0;
1734 }
1735
1736
1737 /*
1738  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1739  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1740  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1741  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1742  */
1743 static ssize_t
1744 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1745                            const char *buf, size_t count)
1746 {
1747         struct Scsi_Host *shost = transport_class_to_shost(dev);
1748         struct fc_vport_identifiers vid;
1749         struct fc_vport *vport;
1750         unsigned int cnt=count;
1751         int stat;
1752
1753         memset(&vid, 0, sizeof(vid));
1754
1755         /* count may include a LF at end of string */
1756         if (buf[cnt-1] == '\n')
1757                 cnt--;
1758
1759         /* validate we have enough characters for WWPN */
1760         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1761                 return -EINVAL;
1762
1763         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1764         if (stat)
1765                 return stat;
1766
1767         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1768         if (stat)
1769                 return stat;
1770
1771         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1772         vid.vport_type = FC_PORTTYPE_NPIV;
1773         /* vid.symbolic_name is already zero/NULL's */
1774         vid.disable = false;            /* always enabled */
1775
1776         /* we only allow support on Channel 0 !!! */
1777         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1778         return stat ? stat : count;
1779 }
1780 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1781                         store_fc_host_vport_create);
1782
1783
1784 /*
1785  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1786  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1787  * The WWNs are specified as hex characters, and may *not* contain
1788  * any prefixes (e.g. 0x, x, etc)
1789  */
1790 static ssize_t
1791 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1792                            const char *buf, size_t count)
1793 {
1794         struct Scsi_Host *shost = transport_class_to_shost(dev);
1795         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1796         struct fc_vport *vport;
1797         u64 wwpn, wwnn;
1798         unsigned long flags;
1799         unsigned int cnt=count;
1800         int stat, match;
1801
1802         /* count may include a LF at end of string */
1803         if (buf[cnt-1] == '\n')
1804                 cnt--;
1805
1806         /* validate we have enough characters for WWPN */
1807         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1808                 return -EINVAL;
1809
1810         stat = fc_parse_wwn(&buf[0], &wwpn);
1811         if (stat)
1812                 return stat;
1813
1814         stat = fc_parse_wwn(&buf[17], &wwnn);
1815         if (stat)
1816                 return stat;
1817
1818         spin_lock_irqsave(shost->host_lock, flags);
1819         match = 0;
1820         /* we only allow support on Channel 0 !!! */
1821         list_for_each_entry(vport, &fc_host->vports, peers) {
1822                 if ((vport->channel == 0) &&
1823                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1824                         match = 1;
1825                         break;
1826                 }
1827         }
1828         spin_unlock_irqrestore(shost->host_lock, flags);
1829
1830         if (!match)
1831                 return -ENODEV;
1832
1833         stat = fc_vport_terminate(vport);
1834         return stat ? stat : count;
1835 }
1836 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1837                         store_fc_host_vport_delete);
1838
1839
1840 static int fc_host_match(struct attribute_container *cont,
1841                           struct device *dev)
1842 {
1843         struct Scsi_Host *shost;
1844         struct fc_internal *i;
1845
1846         if (!scsi_is_host_device(dev))
1847                 return 0;
1848
1849         shost = dev_to_shost(dev);
1850         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1851             != &fc_host_class.class)
1852                 return 0;
1853
1854         i = to_fc_internal(shost->transportt);
1855
1856         return &i->t.host_attrs.ac == cont;
1857 }
1858
1859 static int fc_target_match(struct attribute_container *cont,
1860                             struct device *dev)
1861 {
1862         struct Scsi_Host *shost;
1863         struct fc_internal *i;
1864
1865         if (!scsi_is_target_device(dev))
1866                 return 0;
1867
1868         shost = dev_to_shost(dev->parent);
1869         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1870             != &fc_host_class.class)
1871                 return 0;
1872
1873         i = to_fc_internal(shost->transportt);
1874
1875         return &i->t.target_attrs.ac == cont;
1876 }
1877
1878 static void fc_rport_dev_release(struct device *dev)
1879 {
1880         struct fc_rport *rport = dev_to_rport(dev);
1881         put_device(dev->parent);
1882         kfree(rport);
1883 }
1884
1885 int scsi_is_fc_rport(const struct device *dev)
1886 {
1887         return dev->release == fc_rport_dev_release;
1888 }
1889 EXPORT_SYMBOL(scsi_is_fc_rport);
1890
1891 static int fc_rport_match(struct attribute_container *cont,
1892                             struct device *dev)
1893 {
1894         struct Scsi_Host *shost;
1895         struct fc_internal *i;
1896
1897         if (!scsi_is_fc_rport(dev))
1898                 return 0;
1899
1900         shost = dev_to_shost(dev->parent);
1901         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1902             != &fc_host_class.class)
1903                 return 0;
1904
1905         i = to_fc_internal(shost->transportt);
1906
1907         return &i->rport_attr_cont.ac == cont;
1908 }
1909
1910
1911 static void fc_vport_dev_release(struct device *dev)
1912 {
1913         struct fc_vport *vport = dev_to_vport(dev);
1914         put_device(dev->parent);                /* release kobj parent */
1915         kfree(vport);
1916 }
1917
1918 int scsi_is_fc_vport(const struct device *dev)
1919 {
1920         return dev->release == fc_vport_dev_release;
1921 }
1922 EXPORT_SYMBOL(scsi_is_fc_vport);
1923
1924 static int fc_vport_match(struct attribute_container *cont,
1925                             struct device *dev)
1926 {
1927         struct fc_vport *vport;
1928         struct Scsi_Host *shost;
1929         struct fc_internal *i;
1930
1931         if (!scsi_is_fc_vport(dev))
1932                 return 0;
1933         vport = dev_to_vport(dev);
1934
1935         shost = vport_to_shost(vport);
1936         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1937             != &fc_host_class.class)
1938                 return 0;
1939
1940         i = to_fc_internal(shost->transportt);
1941         return &i->vport_attr_cont.ac == cont;
1942 }
1943
1944
1945 /**
1946  * fc_timed_out - FC Transport I/O timeout intercept handler
1947  * @scmd:       The SCSI command which timed out
1948  *
1949  * This routine protects against error handlers getting invoked while a
1950  * rport is in a blocked state, typically due to a temporarily loss of
1951  * connectivity. If the error handlers are allowed to proceed, requests
1952  * to abort i/o, reset the target, etc will likely fail as there is no way
1953  * to communicate with the device to perform the requested function. These
1954  * failures may result in the midlayer taking the device offline, requiring
1955  * manual intervention to restore operation.
1956  *
1957  * This routine, called whenever an i/o times out, validates the state of
1958  * the underlying rport. If the rport is blocked, it returns
1959  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1960  * Eventually, either the device will return, or devloss_tmo will fire,
1961  * and when the timeout then fires, it will be handled normally.
1962  * If the rport is not blocked, normal error handling continues.
1963  *
1964  * Notes:
1965  *      This routine assumes no locks are held on entry.
1966  */
1967 static enum blk_eh_timer_return
1968 fc_timed_out(struct scsi_cmnd *scmd)
1969 {
1970         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1971
1972         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1973                 return BLK_EH_RESET_TIMER;
1974
1975         return BLK_EH_NOT_HANDLED;
1976 }
1977
1978 /*
1979  * Called by fc_user_scan to locate an rport on the shost that
1980  * matches the channel and target id, and invoke scsi_scan_target()
1981  * on the rport.
1982  */
1983 static void
1984 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1985 {
1986         struct fc_rport *rport;
1987         unsigned long flags;
1988
1989         spin_lock_irqsave(shost->host_lock, flags);
1990
1991         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1992                 if (rport->scsi_target_id == -1)
1993                         continue;
1994
1995                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1996                         continue;
1997
1998                 if ((channel == rport->channel) &&
1999                     (id == rport->scsi_target_id)) {
2000                         spin_unlock_irqrestore(shost->host_lock, flags);
2001                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
2002                         return;
2003                 }
2004         }
2005
2006         spin_unlock_irqrestore(shost->host_lock, flags);
2007 }
2008
2009 /*
2010  * Called via sysfs scan routines. Necessary, as the FC transport
2011  * wants to place all target objects below the rport object. So this
2012  * routine must invoke the scsi_scan_target() routine with the rport
2013  * object as the parent.
2014  */
2015 static int
2016 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2017 {
2018         uint chlo, chhi;
2019         uint tgtlo, tgthi;
2020
2021         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2022             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2023             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2024                 return -EINVAL;
2025
2026         if (channel == SCAN_WILD_CARD) {
2027                 chlo = 0;
2028                 chhi = shost->max_channel + 1;
2029         } else {
2030                 chlo = channel;
2031                 chhi = channel + 1;
2032         }
2033
2034         if (id == SCAN_WILD_CARD) {
2035                 tgtlo = 0;
2036                 tgthi = shost->max_id;
2037         } else {
2038                 tgtlo = id;
2039                 tgthi = id + 1;
2040         }
2041
2042         for ( ; chlo < chhi; chlo++)
2043                 for ( ; tgtlo < tgthi; tgtlo++)
2044                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2045
2046         return 0;
2047 }
2048
2049 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2050                                 int result)
2051 {
2052         struct fc_internal *i = to_fc_internal(shost->transportt);
2053         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2054 }
2055
2056 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2057 {
2058         struct fc_internal *i = to_fc_internal(shost->transportt);
2059         return i->f->it_nexus_response(shost, nexus, result);
2060 }
2061
2062 struct scsi_transport_template *
2063 fc_attach_transport(struct fc_function_template *ft)
2064 {
2065         int count;
2066         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2067                                         GFP_KERNEL);
2068
2069         if (unlikely(!i))
2070                 return NULL;
2071
2072         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2073         i->t.target_attrs.ac.class = &fc_transport_class.class;
2074         i->t.target_attrs.ac.match = fc_target_match;
2075         i->t.target_size = sizeof(struct fc_starget_attrs);
2076         transport_container_register(&i->t.target_attrs);
2077
2078         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2079         i->t.host_attrs.ac.class = &fc_host_class.class;
2080         i->t.host_attrs.ac.match = fc_host_match;
2081         i->t.host_size = sizeof(struct fc_host_attrs);
2082         if (ft->get_fc_host_stats)
2083                 i->t.host_attrs.statistics = &fc_statistics_group;
2084         transport_container_register(&i->t.host_attrs);
2085
2086         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2087         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2088         i->rport_attr_cont.ac.match = fc_rport_match;
2089         transport_container_register(&i->rport_attr_cont);
2090
2091         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2092         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2093         i->vport_attr_cont.ac.match = fc_vport_match;
2094         transport_container_register(&i->vport_attr_cont);
2095
2096         i->f = ft;
2097
2098         /* Transport uses the shost workq for scsi scanning */
2099         i->t.create_work_queue = 1;
2100
2101         i->t.eh_timed_out = fc_timed_out;
2102
2103         i->t.user_scan = fc_user_scan;
2104
2105         /* target-mode drivers' functions */
2106         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2107         i->t.it_nexus_response = fc_it_nexus_response;
2108
2109         /*
2110          * Setup SCSI Target Attributes.
2111          */
2112         count = 0;
2113         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2114         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2115         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2116
2117         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2118
2119         i->starget_attrs[count] = NULL;
2120
2121
2122         /*
2123          * Setup SCSI Host Attributes.
2124          */
2125         count=0;
2126         SETUP_HOST_ATTRIBUTE_RD(node_name);
2127         SETUP_HOST_ATTRIBUTE_RD(port_name);
2128         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2129         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2130         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2131         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2132         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2133         if (ft->vport_create) {
2134                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2135                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2136         }
2137         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2138
2139         SETUP_HOST_ATTRIBUTE_RD(port_id);
2140         SETUP_HOST_ATTRIBUTE_RD(port_type);
2141         SETUP_HOST_ATTRIBUTE_RD(port_state);
2142         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2143         SETUP_HOST_ATTRIBUTE_RD(speed);
2144         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2145         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2146         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2147
2148         /* Transport-managed attributes */
2149         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2150         if (ft->issue_fc_host_lip)
2151                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2152         if (ft->vport_create)
2153                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2154         if (ft->vport_delete)
2155                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2156
2157         BUG_ON(count > FC_HOST_NUM_ATTRS);
2158
2159         i->host_attrs[count] = NULL;
2160
2161         /*
2162          * Setup Remote Port Attributes.
2163          */
2164         count=0;
2165         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2166         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2167         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2168         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2169         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2170         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2171         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2172         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2173         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2174         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2175
2176         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2177
2178         i->rport_attrs[count] = NULL;
2179
2180         /*
2181          * Setup Virtual Port Attributes.
2182          */
2183         count=0;
2184         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2185         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2186         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2187         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2188         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2189         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2190         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2191         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2192         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2193
2194         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2195
2196         i->vport_attrs[count] = NULL;
2197
2198         return &i->t;
2199 }
2200 EXPORT_SYMBOL(fc_attach_transport);
2201
2202 void fc_release_transport(struct scsi_transport_template *t)
2203 {
2204         struct fc_internal *i = to_fc_internal(t);
2205
2206         transport_container_unregister(&i->t.target_attrs);
2207         transport_container_unregister(&i->t.host_attrs);
2208         transport_container_unregister(&i->rport_attr_cont);
2209         transport_container_unregister(&i->vport_attr_cont);
2210
2211         kfree(i);
2212 }
2213 EXPORT_SYMBOL(fc_release_transport);
2214
2215 /**
2216  * fc_queue_work - Queue work to the fc_host workqueue.
2217  * @shost:      Pointer to Scsi_Host bound to fc_host.
2218  * @work:       Work to queue for execution.
2219  *
2220  * Return value:
2221  *      1 - work queued for execution
2222  *      0 - work is already queued
2223  *      -EINVAL - work queue doesn't exist
2224  */
2225 static int
2226 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2227 {
2228         if (unlikely(!fc_host_work_q(shost))) {
2229                 printk(KERN_ERR
2230                         "ERROR: FC host '%s' attempted to queue work, "
2231                         "when no workqueue created.\n", shost->hostt->name);
2232                 dump_stack();
2233
2234                 return -EINVAL;
2235         }
2236
2237         return queue_work(fc_host_work_q(shost), work);
2238 }
2239
2240 /**
2241  * fc_flush_work - Flush a fc_host's workqueue.
2242  * @shost:      Pointer to Scsi_Host bound to fc_host.
2243  */
2244 static void
2245 fc_flush_work(struct Scsi_Host *shost)
2246 {
2247         if (!fc_host_work_q(shost)) {
2248                 printk(KERN_ERR
2249                         "ERROR: FC host '%s' attempted to flush work, "
2250                         "when no workqueue created.\n", shost->hostt->name);
2251                 dump_stack();
2252                 return;
2253         }
2254
2255         flush_workqueue(fc_host_work_q(shost));
2256 }
2257
2258 /**
2259  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2260  * @shost:      Pointer to Scsi_Host bound to fc_host.
2261  * @work:       Work to queue for execution.
2262  * @delay:      jiffies to delay the work queuing
2263  *
2264  * Return value:
2265  *      1 on success / 0 already queued / < 0 for error
2266  */
2267 static int
2268 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2269                                 unsigned long delay)
2270 {
2271         if (unlikely(!fc_host_devloss_work_q(shost))) {
2272                 printk(KERN_ERR
2273                         "ERROR: FC host '%s' attempted to queue work, "
2274                         "when no workqueue created.\n", shost->hostt->name);
2275                 dump_stack();
2276
2277                 return -EINVAL;
2278         }
2279
2280         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2281 }
2282
2283 /**
2284  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2285  * @shost:      Pointer to Scsi_Host bound to fc_host.
2286  */
2287 static void
2288 fc_flush_devloss(struct Scsi_Host *shost)
2289 {
2290         if (!fc_host_devloss_work_q(shost)) {
2291                 printk(KERN_ERR
2292                         "ERROR: FC host '%s' attempted to flush work, "
2293                         "when no workqueue created.\n", shost->hostt->name);
2294                 dump_stack();
2295                 return;
2296         }
2297
2298         flush_workqueue(fc_host_devloss_work_q(shost));
2299 }
2300
2301
2302 /**
2303  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2304  * @shost:      Which &Scsi_Host
2305  *
2306  * This routine is expected to be called immediately preceeding the
2307  * a driver's call to scsi_remove_host().
2308  *
2309  * WARNING: A driver utilizing the fc_transport, which fails to call
2310  *   this routine prior to scsi_remove_host(), will leave dangling
2311  *   objects in /sys/class/fc_remote_ports. Access to any of these
2312  *   objects can result in a system crash !!!
2313  *
2314  * Notes:
2315  *      This routine assumes no locks are held on entry.
2316  */
2317 void
2318 fc_remove_host(struct Scsi_Host *shost)
2319 {
2320         struct fc_vport *vport = NULL, *next_vport = NULL;
2321         struct fc_rport *rport = NULL, *next_rport = NULL;
2322         struct workqueue_struct *work_q;
2323         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2324         unsigned long flags;
2325
2326         spin_lock_irqsave(shost->host_lock, flags);
2327
2328         /* Remove any vports */
2329         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2330                 fc_queue_work(shost, &vport->vport_delete_work);
2331
2332         /* Remove any remote ports */
2333         list_for_each_entry_safe(rport, next_rport,
2334                         &fc_host->rports, peers) {
2335                 list_del(&rport->peers);
2336                 rport->port_state = FC_PORTSTATE_DELETED;
2337                 fc_queue_work(shost, &rport->rport_delete_work);
2338         }
2339
2340         list_for_each_entry_safe(rport, next_rport,
2341                         &fc_host->rport_bindings, peers) {
2342                 list_del(&rport->peers);
2343                 rport->port_state = FC_PORTSTATE_DELETED;
2344                 fc_queue_work(shost, &rport->rport_delete_work);
2345         }
2346
2347         spin_unlock_irqrestore(shost->host_lock, flags);
2348
2349         /* flush all scan work items */
2350         scsi_flush_work(shost);
2351
2352         /* flush all stgt delete, and rport delete work items, then kill it  */
2353         if (fc_host->work_q) {
2354                 work_q = fc_host->work_q;
2355                 fc_host->work_q = NULL;
2356                 destroy_workqueue(work_q);
2357         }
2358
2359         /* flush all devloss work items, then kill it  */
2360         if (fc_host->devloss_work_q) {
2361                 work_q = fc_host->devloss_work_q;
2362                 fc_host->devloss_work_q = NULL;
2363                 destroy_workqueue(work_q);
2364         }
2365 }
2366 EXPORT_SYMBOL(fc_remove_host);
2367
2368 static void fc_terminate_rport_io(struct fc_rport *rport)
2369 {
2370         struct Scsi_Host *shost = rport_to_shost(rport);
2371         struct fc_internal *i = to_fc_internal(shost->transportt);
2372
2373         /* Involve the LLDD if possible to terminate all io on the rport. */
2374         if (i->f->terminate_rport_io)
2375                 i->f->terminate_rport_io(rport);
2376
2377         /*
2378          * must unblock to flush queued IO. The caller will have set
2379          * the port_state or flags, so that fc_remote_port_chkready will
2380          * fail IO.
2381          */
2382         scsi_target_unblock(&rport->dev);
2383 }
2384
2385 /**
2386  * fc_starget_delete - called to delete the scsi decendents of an rport
2387  * @work:       remote port to be operated on.
2388  *
2389  * Deletes target and all sdevs.
2390  */
2391 static void
2392 fc_starget_delete(struct work_struct *work)
2393 {
2394         struct fc_rport *rport =
2395                 container_of(work, struct fc_rport, stgt_delete_work);
2396
2397         fc_terminate_rport_io(rport);
2398         scsi_remove_target(&rport->dev);
2399 }
2400
2401
2402 /**
2403  * fc_rport_final_delete - finish rport termination and delete it.
2404  * @work:       remote port to be deleted.
2405  */
2406 static void
2407 fc_rport_final_delete(struct work_struct *work)
2408 {
2409         struct fc_rport *rport =
2410                 container_of(work, struct fc_rport, rport_delete_work);
2411         struct device *dev = &rport->dev;
2412         struct Scsi_Host *shost = rport_to_shost(rport);
2413         struct fc_internal *i = to_fc_internal(shost->transportt);
2414         unsigned long flags;
2415         int do_callback = 0;
2416
2417         /*
2418          * if a scan is pending, flush the SCSI Host work_q so that
2419          * that we can reclaim the rport scan work element.
2420          */
2421         if (rport->flags & FC_RPORT_SCAN_PENDING)
2422                 scsi_flush_work(shost);
2423
2424         fc_terminate_rport_io(rport);
2425
2426         /*
2427          * Cancel any outstanding timers. These should really exist
2428          * only when rmmod'ing the LLDD and we're asking for
2429          * immediate termination of the rports
2430          */
2431         spin_lock_irqsave(shost->host_lock, flags);
2432         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2433                 spin_unlock_irqrestore(shost->host_lock, flags);
2434                 if (!cancel_delayed_work(&rport->fail_io_work))
2435                         fc_flush_devloss(shost);
2436                 if (!cancel_delayed_work(&rport->dev_loss_work))
2437                         fc_flush_devloss(shost);
2438                 spin_lock_irqsave(shost->host_lock, flags);
2439                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2440         }
2441         spin_unlock_irqrestore(shost->host_lock, flags);
2442
2443         /* Delete SCSI target and sdevs */
2444         if (rport->scsi_target_id != -1)
2445                 fc_starget_delete(&rport->stgt_delete_work);
2446
2447         /*
2448          * Notify the driver that the rport is now dead. The LLDD will
2449          * also guarantee that any communication to the rport is terminated
2450          *
2451          * Avoid this call if we already called it when we preserved the
2452          * rport for the binding.
2453          */
2454         spin_lock_irqsave(shost->host_lock, flags);
2455         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2456             (i->f->dev_loss_tmo_callbk)) {
2457                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2458                 do_callback = 1;
2459         }
2460         spin_unlock_irqrestore(shost->host_lock, flags);
2461
2462         if (do_callback)
2463                 i->f->dev_loss_tmo_callbk(rport);
2464
2465         fc_bsg_remove(rport->rqst_q);
2466
2467         transport_remove_device(dev);
2468         device_del(dev);
2469         transport_destroy_device(dev);
2470         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2471         put_device(dev);                        /* for self-reference */
2472 }
2473
2474
2475 /**
2476  * fc_rport_create - allocates and creates a remote FC port.
2477  * @shost:      scsi host the remote port is connected to.
2478  * @channel:    Channel on shost port connected to.
2479  * @ids:        The world wide names, fc address, and FC4 port
2480  *              roles for the remote port.
2481  *
2482  * Allocates and creates the remoter port structure, including the
2483  * class and sysfs creation.
2484  *
2485  * Notes:
2486  *      This routine assumes no locks are held on entry.
2487  */
2488 static struct fc_rport *
2489 fc_rport_create(struct Scsi_Host *shost, int channel,
2490         struct fc_rport_identifiers  *ids)
2491 {
2492         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2493         struct fc_internal *fci = to_fc_internal(shost->transportt);
2494         struct fc_rport *rport;
2495         struct device *dev;
2496         unsigned long flags;
2497         int error;
2498         size_t size;
2499
2500         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2501         rport = kzalloc(size, GFP_KERNEL);
2502         if (unlikely(!rport)) {
2503                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2504                 return NULL;
2505         }
2506
2507         rport->maxframe_size = -1;
2508         rport->supported_classes = FC_COS_UNSPECIFIED;
2509         rport->dev_loss_tmo = fc_dev_loss_tmo;
2510         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2511         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2512         rport->port_id = ids->port_id;
2513         rport->roles = ids->roles;
2514         rport->port_state = FC_PORTSTATE_ONLINE;
2515         if (fci->f->dd_fcrport_size)
2516                 rport->dd_data = &rport[1];
2517         rport->channel = channel;
2518         rport->fast_io_fail_tmo = -1;
2519
2520         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2521         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2522         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2523         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2524         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2525
2526         spin_lock_irqsave(shost->host_lock, flags);
2527
2528         rport->number = fc_host->next_rport_number++;
2529         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2530                 rport->scsi_target_id = fc_host->next_target_id++;
2531         else
2532                 rport->scsi_target_id = -1;
2533         list_add_tail(&rport->peers, &fc_host->rports);
2534         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2535
2536         spin_unlock_irqrestore(shost->host_lock, flags);
2537
2538         dev = &rport->dev;
2539         device_initialize(dev);                 /* takes self reference */
2540         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2541         dev->release = fc_rport_dev_release;
2542         dev_set_name(dev, "rport-%d:%d-%d",
2543                      shost->host_no, channel, rport->number);
2544         transport_setup_device(dev);
2545
2546         error = device_add(dev);
2547         if (error) {
2548                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2549                 goto delete_rport;
2550         }
2551         transport_add_device(dev);
2552         transport_configure_device(dev);
2553
2554         fc_bsg_rportadd(shost, rport);
2555         /* ignore any bsg add error - we just can't do sgio */
2556
2557         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2558                 /* initiate a scan of the target */
2559                 rport->flags |= FC_RPORT_SCAN_PENDING;
2560                 scsi_queue_work(shost, &rport->scan_work);
2561         }
2562
2563         return rport;
2564
2565 delete_rport:
2566         transport_destroy_device(dev);
2567         spin_lock_irqsave(shost->host_lock, flags);
2568         list_del(&rport->peers);
2569         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2570         spin_unlock_irqrestore(shost->host_lock, flags);
2571         put_device(dev->parent);
2572         kfree(rport);
2573         return NULL;
2574 }
2575
2576 /**
2577  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2578  * @shost:      scsi host the remote port is connected to.
2579  * @channel:    Channel on shost port connected to.
2580  * @ids:        The world wide names, fc address, and FC4 port
2581  *              roles for the remote port.
2582  *
2583  * The LLDD calls this routine to notify the transport of the existence
2584  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2585  * of the port, it's FC address (port_id), and the FC4 roles that are
2586  * active for the port.
2587  *
2588  * For ports that are FCP targets (aka scsi targets), the FC transport
2589  * maintains consistent target id bindings on behalf of the LLDD.
2590  * A consistent target id binding is an assignment of a target id to
2591  * a remote port identifier, which persists while the scsi host is
2592  * attached. The remote port can disappear, then later reappear, and
2593  * it's target id assignment remains the same. This allows for shifts
2594  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2595  * changes to the scsi subsystem which is based on scsi host number and
2596  * target id values.  Bindings are only valid during the attachment of
2597  * the scsi host. If the host detaches, then later re-attaches, target
2598  * id bindings may change.
2599  *
2600  * This routine is responsible for returning a remote port structure.
2601  * The routine will search the list of remote ports it maintains
2602  * internally on behalf of consistent target id mappings. If found, the
2603  * remote port structure will be reused. Otherwise, a new remote port
2604  * structure will be allocated.
2605  *
2606  * Whenever a remote port is allocated, a new fc_remote_port class
2607  * device is created.
2608  *
2609  * Should not be called from interrupt context.
2610  *
2611  * Notes:
2612  *      This routine assumes no locks are held on entry.
2613  */
2614 struct fc_rport *
2615 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2616         struct fc_rport_identifiers  *ids)
2617 {
2618         struct fc_internal *fci = to_fc_internal(shost->transportt);
2619         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2620         struct fc_rport *rport;
2621         unsigned long flags;
2622         int match = 0;
2623
2624         /* ensure any stgt delete functions are done */
2625         fc_flush_work(shost);
2626
2627         /*
2628          * Search the list of "active" rports, for an rport that has been
2629          * deleted, but we've held off the real delete while the target
2630          * is in a "blocked" state.
2631          */
2632         spin_lock_irqsave(shost->host_lock, flags);
2633
2634         list_for_each_entry(rport, &fc_host->rports, peers) {
2635
2636                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2637                         (rport->channel == channel)) {
2638
2639                         switch (fc_host->tgtid_bind_type) {
2640                         case FC_TGTID_BIND_BY_WWPN:
2641                         case FC_TGTID_BIND_NONE:
2642                                 if (rport->port_name == ids->port_name)
2643                                         match = 1;
2644                                 break;
2645                         case FC_TGTID_BIND_BY_WWNN:
2646                                 if (rport->node_name == ids->node_name)
2647                                         match = 1;
2648                                 break;
2649                         case FC_TGTID_BIND_BY_ID:
2650                                 if (rport->port_id == ids->port_id)
2651                                         match = 1;
2652                                 break;
2653                         }
2654
2655                         if (match) {
2656
2657                                 memcpy(&rport->node_name, &ids->node_name,
2658                                         sizeof(rport->node_name));
2659                                 memcpy(&rport->port_name, &ids->port_name,
2660                                         sizeof(rport->port_name));
2661                                 rport->port_id = ids->port_id;
2662
2663                                 rport->port_state = FC_PORTSTATE_ONLINE;
2664                                 rport->roles = ids->roles;
2665
2666                                 spin_unlock_irqrestore(shost->host_lock, flags);
2667
2668                                 if (fci->f->dd_fcrport_size)
2669                                         memset(rport->dd_data, 0,
2670                                                 fci->f->dd_fcrport_size);
2671
2672                                 /*
2673                                  * If we were not a target, cancel the
2674                                  * io terminate and rport timers, and
2675                                  * we're done.
2676                                  *
2677                                  * If we were a target, but our new role
2678                                  * doesn't indicate a target, leave the
2679                                  * timers running expecting the role to
2680                                  * change as the target fully logs in. If
2681                                  * it doesn't, the target will be torn down.
2682                                  *
2683                                  * If we were a target, and our role shows
2684                                  * we're still a target, cancel the timers
2685                                  * and kick off a scan.
2686                                  */
2687
2688                                 /* was a target, not in roles */
2689                                 if ((rport->scsi_target_id != -1) &&
2690                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2691                                         return rport;
2692
2693                                 /*
2694                                  * Stop the fail io and dev_loss timers.
2695                                  * If they flush, the port_state will
2696                                  * be checked and will NOOP the function.
2697                                  */
2698                                 if (!cancel_delayed_work(&rport->fail_io_work))
2699                                         fc_flush_devloss(shost);
2700                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2701                                         fc_flush_devloss(shost);
2702
2703                                 spin_lock_irqsave(shost->host_lock, flags);
2704
2705                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2706                                                   FC_RPORT_DEVLOSS_PENDING |
2707                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2708
2709                                 /* if target, initiate a scan */
2710                                 if (rport->scsi_target_id != -1) {
2711                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2712                                         scsi_queue_work(shost,
2713                                                         &rport->scan_work);
2714                                         spin_unlock_irqrestore(shost->host_lock,
2715                                                         flags);
2716                                         scsi_target_unblock(&rport->dev);
2717                                 } else
2718                                         spin_unlock_irqrestore(shost->host_lock,
2719                                                         flags);
2720
2721                                 fc_bsg_goose_queue(rport);
2722
2723                                 return rport;
2724                         }
2725                 }
2726         }
2727
2728         /*
2729          * Search the bindings array
2730          * Note: if never a FCP target, you won't be on this list
2731          */
2732         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2733
2734                 /* search for a matching consistent binding */
2735
2736                 list_for_each_entry(rport, &fc_host->rport_bindings,
2737                                         peers) {
2738                         if (rport->channel != channel)
2739                                 continue;
2740
2741                         switch (fc_host->tgtid_bind_type) {
2742                         case FC_TGTID_BIND_BY_WWPN:
2743                                 if (rport->port_name == ids->port_name)
2744                                         match = 1;
2745                                 break;
2746                         case FC_TGTID_BIND_BY_WWNN:
2747                                 if (rport->node_name == ids->node_name)
2748                                         match = 1;
2749                                 break;
2750                         case FC_TGTID_BIND_BY_ID:
2751                                 if (rport->port_id == ids->port_id)
2752                                         match = 1;
2753                                 break;
2754                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2755                                 break;
2756                         }
2757
2758                         if (match) {
2759                                 list_move_tail(&rport->peers, &fc_host->rports);
2760                                 break;
2761                         }
2762                 }
2763
2764                 if (match) {
2765                         memcpy(&rport->node_name, &ids->node_name,
2766                                 sizeof(rport->node_name));
2767                         memcpy(&rport->port_name, &ids->port_name,
2768                                 sizeof(rport->port_name));
2769                         rport->port_id = ids->port_id;
2770                         rport->roles = ids->roles;
2771                         rport->port_state = FC_PORTSTATE_ONLINE;
2772                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2773
2774                         if (fci->f->dd_fcrport_size)
2775                                 memset(rport->dd_data, 0,
2776                                                 fci->f->dd_fcrport_size);
2777
2778                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2779                                 /* initiate a scan of the target */
2780                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2781                                 scsi_queue_work(shost, &rport->scan_work);
2782                                 spin_unlock_irqrestore(shost->host_lock, flags);
2783                                 scsi_target_unblock(&rport->dev);
2784                         } else
2785                                 spin_unlock_irqrestore(shost->host_lock, flags);
2786
2787                         return rport;
2788                 }
2789         }
2790
2791         spin_unlock_irqrestore(shost->host_lock, flags);
2792
2793         /* No consistent binding found - create new remote port entry */
2794         rport = fc_rport_create(shost, channel, ids);
2795
2796         return rport;
2797 }
2798 EXPORT_SYMBOL(fc_remote_port_add);
2799
2800
2801 /**
2802  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2803  * @rport:      The remote port that no longer exists
2804  *
2805  * The LLDD calls this routine to notify the transport that a remote
2806  * port is no longer part of the topology. Note: Although a port
2807  * may no longer be part of the topology, it may persist in the remote
2808  * ports displayed by the fc_host. We do this under 2 conditions:
2809  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2810  *   This allows the port to temporarily disappear, then reappear without
2811  *   disrupting the SCSI device tree attached to it. During the "blocked"
2812  *   period the port will still exist.
2813  * 2) If the port was a scsi target and disappears for longer than we
2814  *   expect, we'll delete the port and the tear down the SCSI device tree
2815  *   attached to it. However, we want to semi-persist the target id assigned
2816  *   to that port if it eventually does exist. The port structure will
2817  *   remain (although with minimal information) so that the target id
2818  *   bindings remails.
2819  *
2820  * If the remote port is not an FCP Target, it will be fully torn down
2821  * and deallocated, including the fc_remote_port class device.
2822  *
2823  * If the remote port is an FCP Target, the port will be placed in a
2824  * temporary blocked state. From the LLDD's perspective, the rport no
2825  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2826  * exists, but all sdevs on it are blocked from further I/O. The following
2827  * is then expected.
2828  *
2829  *   If the remote port does not return (signaled by a LLDD call to
2830  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2831  *   scsi target is removed - killing all outstanding i/o and removing the
2832  *   scsi devices attached ot it. The port structure will be marked Not
2833  *   Present and be partially cleared, leaving only enough information to
2834  *   recognize the remote port relative to the scsi target id binding if
2835  *   it later appears.  The port will remain as long as there is a valid
2836  *   binding (e.g. until the user changes the binding type or unloads the
2837  *   scsi host with the binding).
2838  *
2839  *   If the remote port returns within the dev_loss_tmo value (and matches
2840  *   according to the target id binding type), the port structure will be
2841  *   reused. If it is no longer a SCSI target, the target will be torn
2842  *   down. If it continues to be a SCSI target, then the target will be
2843  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2844  *   to ensure that all luns are detected.
2845  *
2846  * Called from normal process context only - cannot be called from interrupt.
2847  *
2848  * Notes:
2849  *      This routine assumes no locks are held on entry.
2850  */
2851 void
2852 fc_remote_port_delete(struct fc_rport  *rport)
2853 {
2854         struct Scsi_Host *shost = rport_to_shost(rport);
2855         int timeout = rport->dev_loss_tmo;
2856         unsigned long flags;
2857
2858         /*
2859          * No need to flush the fc_host work_q's, as all adds are synchronous.
2860          *
2861          * We do need to reclaim the rport scan work element, so eventually
2862          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2863          * there's still a scan pending.
2864          */
2865
2866         spin_lock_irqsave(shost->host_lock, flags);
2867
2868         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2869                 spin_unlock_irqrestore(shost->host_lock, flags);
2870                 return;
2871         }
2872
2873         /*
2874          * In the past, we if this was not an FCP-Target, we would
2875          * unconditionally just jump to deleting the rport.
2876          * However, rports can be used as node containers by the LLDD,
2877          * and its not appropriate to just terminate the rport at the
2878          * first sign of a loss in connectivity. The LLDD may want to
2879          * send ELS traffic to re-validate the login. If the rport is
2880          * immediately deleted, it makes it inappropriate for a node
2881          * container.
2882          * So... we now unconditionally wait dev_loss_tmo before
2883          * destroying an rport.
2884          */
2885
2886         rport->port_state = FC_PORTSTATE_BLOCKED;
2887
2888         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2889
2890         spin_unlock_irqrestore(shost->host_lock, flags);
2891
2892         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2893             shost->active_mode & MODE_TARGET)
2894                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2895
2896         scsi_target_block(&rport->dev);
2897
2898         /* see if we need to kill io faster than waiting for device loss */
2899         if ((rport->fast_io_fail_tmo != -1) &&
2900             (rport->fast_io_fail_tmo < timeout))
2901                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2902                                         rport->fast_io_fail_tmo * HZ);
2903
2904         /* cap the length the devices can be blocked until they are deleted */
2905         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2906 }
2907 EXPORT_SYMBOL(fc_remote_port_delete);
2908
2909 /**
2910  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2911  * @rport:      The remote port that changed.
2912  * @roles:      New roles for this port.
2913  *
2914  * Description: The LLDD calls this routine to notify the transport that the
2915  * roles on a remote port may have changed. The largest effect of this is
2916  * if a port now becomes a FCP Target, it must be allocated a
2917  * scsi target id.  If the port is no longer a FCP target, any
2918  * scsi target id value assigned to it will persist in case the
2919  * role changes back to include FCP Target. No changes in the scsi
2920  * midlayer will be invoked if the role changes (in the expectation
2921  * that the role will be resumed. If it doesn't normal error processing
2922  * will take place).
2923  *
2924  * Should not be called from interrupt context.
2925  *
2926  * Notes:
2927  *      This routine assumes no locks are held on entry.
2928  */
2929 void
2930 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2931 {
2932         struct Scsi_Host *shost = rport_to_shost(rport);
2933         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2934         unsigned long flags;
2935         int create = 0;
2936         int ret;
2937
2938         spin_lock_irqsave(shost->host_lock, flags);
2939         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2940                 if (rport->scsi_target_id == -1) {
2941                         rport->scsi_target_id = fc_host->next_target_id++;
2942                         create = 1;
2943                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2944                         create = 1;
2945         } else if (shost->active_mode & MODE_TARGET) {
2946                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2947                                              (char *)&rport->node_name);
2948                 if (ret)
2949                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2950                                ret);
2951         }
2952
2953         rport->roles = roles;
2954
2955         spin_unlock_irqrestore(shost->host_lock, flags);
2956
2957         if (create) {
2958                 /*
2959                  * There may have been a delete timer running on the
2960                  * port. Ensure that it is cancelled as we now know
2961                  * the port is an FCP Target.
2962                  * Note: we know the rport is exists and in an online
2963                  *  state as the LLDD would not have had an rport
2964                  *  reference to pass us.
2965                  *
2966                  * Take no action on the del_timer failure as the state
2967                  * machine state change will validate the
2968                  * transaction.
2969                  */
2970                 if (!cancel_delayed_work(&rport->fail_io_work))
2971                         fc_flush_devloss(shost);
2972                 if (!cancel_delayed_work(&rport->dev_loss_work))
2973                         fc_flush_devloss(shost);
2974
2975                 spin_lock_irqsave(shost->host_lock, flags);
2976                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2977                                   FC_RPORT_DEVLOSS_PENDING);
2978                 spin_unlock_irqrestore(shost->host_lock, flags);
2979
2980                 /* ensure any stgt delete functions are done */
2981                 fc_flush_work(shost);
2982
2983                 /* initiate a scan of the target */
2984                 spin_lock_irqsave(shost->host_lock, flags);
2985                 rport->flags |= FC_RPORT_SCAN_PENDING;
2986                 scsi_queue_work(shost, &rport->scan_work);
2987                 spin_unlock_irqrestore(shost->host_lock, flags);
2988                 scsi_target_unblock(&rport->dev);
2989         }
2990 }
2991 EXPORT_SYMBOL(fc_remote_port_rolechg);
2992
2993 /**
2994  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2995  * @work:       rport target that failed to reappear in the allotted time.
2996  *
2997  * Description: An attempt to delete a remote port blocks, and if it fails
2998  *              to return in the allotted time this gets called.
2999  */
3000 static void
3001 fc_timeout_deleted_rport(struct work_struct *work)
3002 {
3003         struct fc_rport *rport =
3004                 container_of(work, struct fc_rport, dev_loss_work.work);
3005         struct Scsi_Host *shost = rport_to_shost(rport);
3006         struct fc_internal *i = to_fc_internal(shost->transportt);
3007         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3008         unsigned long flags;
3009         int do_callback = 0;
3010
3011         spin_lock_irqsave(shost->host_lock, flags);
3012
3013         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3014
3015         /*
3016          * If the port is ONLINE, then it came back. If it was a SCSI
3017          * target, validate it still is. If not, tear down the
3018          * scsi_target on it.
3019          */
3020         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3021             (rport->scsi_target_id != -1) &&
3022             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3023                 dev_printk(KERN_ERR, &rport->dev,
3024                         "blocked FC remote port time out: no longer"
3025                         " a FCP target, removing starget\n");
3026                 spin_unlock_irqrestore(shost->host_lock, flags);
3027                 scsi_target_unblock(&rport->dev);
3028                 fc_queue_work(shost, &rport->stgt_delete_work);
3029                 return;
3030         }
3031
3032         /* NOOP state - we're flushing workq's */
3033         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3034                 spin_unlock_irqrestore(shost->host_lock, flags);
3035                 dev_printk(KERN_ERR, &rport->dev,
3036                         "blocked FC remote port time out: leaving"
3037                         " rport%s alone\n",
3038                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3039                 return;
3040         }
3041
3042         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3043             (rport->scsi_target_id == -1)) {
3044                 list_del(&rport->peers);
3045                 rport->port_state = FC_PORTSTATE_DELETED;
3046                 dev_printk(KERN_ERR, &rport->dev,
3047                         "blocked FC remote port time out: removing"
3048                         " rport%s\n",
3049                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3050                 fc_queue_work(shost, &rport->rport_delete_work);
3051                 spin_unlock_irqrestore(shost->host_lock, flags);
3052                 return;
3053         }
3054
3055         dev_printk(KERN_ERR, &rport->dev,
3056                 "blocked FC remote port time out: removing target and "
3057                 "saving binding\n");
3058
3059         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3060
3061         /*
3062          * Note: We do not remove or clear the hostdata area. This allows
3063          *   host-specific target data to persist along with the
3064          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3065          */
3066
3067         /*
3068          * Reinitialize port attributes that may change if the port comes back.
3069          */
3070         rport->maxframe_size = -1;
3071         rport->supported_classes = FC_COS_UNSPECIFIED;
3072         rport->roles = FC_PORT_ROLE_UNKNOWN;
3073         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3074         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3075
3076         /*
3077          * Pre-emptively kill I/O rather than waiting for the work queue
3078          * item to teardown the starget. (FCOE libFC folks prefer this
3079          * and to have the rport_port_id still set when it's done).
3080          */
3081         spin_unlock_irqrestore(shost->host_lock, flags);
3082         fc_terminate_rport_io(rport);
3083
3084         spin_lock_irqsave(shost->host_lock, flags);
3085
3086         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3087
3088                 /* remove the identifiers that aren't used in the consisting binding */
3089                 switch (fc_host->tgtid_bind_type) {
3090                 case FC_TGTID_BIND_BY_WWPN:
3091                         rport->node_name = -1;
3092                         rport->port_id = -1;
3093                         break;
3094                 case FC_TGTID_BIND_BY_WWNN:
3095                         rport->port_name = -1;
3096                         rport->port_id = -1;
3097                         break;
3098                 case FC_TGTID_BIND_BY_ID:
3099                         rport->node_name = -1;
3100                         rport->port_name = -1;
3101                         break;
3102                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3103                         break;
3104                 }
3105
3106                 /*
3107                  * As this only occurs if the remote port (scsi target)
3108                  * went away and didn't come back - we'll remove
3109                  * all attached scsi devices.
3110                  */
3111                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3112                 fc_queue_work(shost, &rport->stgt_delete_work);
3113
3114                 do_callback = 1;
3115         }
3116
3117         spin_unlock_irqrestore(shost->host_lock, flags);
3118
3119         /*
3120          * Notify the driver that the rport is now dead. The LLDD will
3121          * also guarantee that any communication to the rport is terminated
3122          *
3123          * Note: we set the CALLBK_DONE flag above to correspond
3124          */
3125         if (do_callback && i->f->dev_loss_tmo_callbk)
3126                 i->f->dev_loss_tmo_callbk(rport);
3127 }
3128
3129
3130 /**
3131  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3132  * @work:       rport to terminate io on.
3133  *
3134  * Notes: Only requests the failure of the io, not that all are flushed
3135  *    prior to returning.
3136  */
3137 static void
3138 fc_timeout_fail_rport_io(struct work_struct *work)
3139 {
3140         struct fc_rport *rport =
3141                 container_of(work, struct fc_rport, fail_io_work.work);
3142
3143         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3144                 return;
3145
3146         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3147         fc_terminate_rport_io(rport);
3148 }
3149
3150 /**
3151  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3152  * @work:       remote port to be scanned.
3153  */
3154 static void
3155 fc_scsi_scan_rport(struct work_struct *work)
3156 {
3157         struct fc_rport *rport =
3158                 container_of(work, struct fc_rport, scan_work);
3159         struct Scsi_Host *shost = rport_to_shost(rport);
3160         struct fc_internal *i = to_fc_internal(shost->transportt);
3161         unsigned long flags;
3162
3163         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3164             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3165             !(i->f->disable_target_scan)) {
3166                 scsi_scan_target(&rport->dev, rport->channel,
3167                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3168         }
3169
3170         spin_lock_irqsave(shost->host_lock, flags);
3171         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3172         spin_unlock_irqrestore(shost->host_lock, flags);
3173 }
3174
3175 /**
3176  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3177  * @cmnd: SCSI command that scsi_eh is trying to recover
3178  *
3179  * This routine can be called from a FC LLD scsi_eh callback. It
3180  * blocks the scsi_eh thread until the fc_rport leaves the
3181  * FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
3182  * failing recovery actions for blocked rports which would lead to
3183  * offlined SCSI devices.
3184  */
3185 void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3186 {
3187         struct Scsi_Host *shost = cmnd->device->host;
3188         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3189         unsigned long flags;
3190
3191         spin_lock_irqsave(shost->host_lock, flags);
3192         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
3193                 spin_unlock_irqrestore(shost->host_lock, flags);
3194                 msleep(1000);
3195                 spin_lock_irqsave(shost->host_lock, flags);
3196         }
3197         spin_unlock_irqrestore(shost->host_lock, flags);
3198 }
3199 EXPORT_SYMBOL(fc_block_scsi_eh);
3200
3201 /**
3202  * fc_vport_setup - allocates and creates a FC virtual port.
3203  * @shost:      scsi host the virtual port is connected to.
3204  * @channel:    Channel on shost port connected to.
3205  * @pdev:       parent device for vport
3206  * @ids:        The world wide names, FC4 port roles, etc for
3207  *              the virtual port.
3208  * @ret_vport:  The pointer to the created vport.
3209  *
3210  * Allocates and creates the vport structure, calls the parent host
3211  * to instantiate the vport, the completes w/ class and sysfs creation.
3212  *
3213  * Notes:
3214  *      This routine assumes no locks are held on entry.
3215  */
3216 static int
3217 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3218         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3219 {
3220         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3221         struct fc_internal *fci = to_fc_internal(shost->transportt);
3222         struct fc_vport *vport;
3223         struct device *dev;
3224         unsigned long flags;
3225         size_t size;
3226         int error;
3227
3228         *ret_vport = NULL;
3229
3230         if ( ! fci->f->vport_create)
3231                 return -ENOENT;
3232
3233         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3234         vport = kzalloc(size, GFP_KERNEL);
3235         if (unlikely(!vport)) {
3236                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3237                 return -ENOMEM;
3238         }
3239
3240         vport->vport_state = FC_VPORT_UNKNOWN;
3241         vport->vport_last_state = FC_VPORT_UNKNOWN;
3242         vport->node_name = ids->node_name;
3243         vport->port_name = ids->port_name;
3244         vport->roles = ids->roles;
3245         vport->vport_type = ids->vport_type;
3246         if (fci->f->dd_fcvport_size)
3247                 vport->dd_data = &vport[1];
3248         vport->shost = shost;
3249         vport->channel = channel;
3250         vport->flags = FC_VPORT_CREATING;
3251         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3252
3253         spin_lock_irqsave(shost->host_lock, flags);
3254
3255         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3256                 spin_unlock_irqrestore(shost->host_lock, flags);
3257                 kfree(vport);
3258                 return -ENOSPC;
3259         }
3260         fc_host->npiv_vports_inuse++;
3261         vport->number = fc_host->next_vport_number++;
3262         list_add_tail(&vport->peers, &fc_host->vports);
3263         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3264
3265         spin_unlock_irqrestore(shost->host_lock, flags);
3266
3267         dev = &vport->dev;
3268         device_initialize(dev);                 /* takes self reference */
3269         dev->parent = get_device(pdev);         /* takes parent reference */
3270         dev->release = fc_vport_dev_release;
3271         dev_set_name(dev, "vport-%d:%d-%d",
3272                      shost->host_no, channel, vport->number);
3273         transport_setup_device(dev);
3274
3275         error = device_add(dev);
3276         if (error) {
3277                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3278                 goto delete_vport;
3279         }
3280         transport_add_device(dev);
3281         transport_configure_device(dev);
3282
3283         error = fci->f->vport_create(vport, ids->disable);
3284         if (error) {
3285                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3286                 goto delete_vport_all;
3287         }
3288
3289         /*
3290          * if the parent isn't the physical adapter's Scsi_Host, ensure
3291          * the Scsi_Host at least contains ia symlink to the vport.
3292          */
3293         if (pdev != &shost->shost_gendev) {
3294                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3295                                  &dev->kobj, dev_name(dev));
3296                 if (error)
3297                         printk(KERN_ERR
3298                                 "%s: Cannot create vport symlinks for "
3299                                 "%s, err=%d\n",
3300                                 __func__, dev_name(dev), error);
3301         }
3302         spin_lock_irqsave(shost->host_lock, flags);
3303         vport->flags &= ~FC_VPORT_CREATING;
3304         spin_unlock_irqrestore(shost->host_lock, flags);
3305
3306         dev_printk(KERN_NOTICE, pdev,
3307                         "%s created via shost%d channel %d\n", dev_name(dev),
3308                         shost->host_no, channel);
3309
3310         *ret_vport = vport;
3311
3312         return 0;
3313
3314 delete_vport_all:
3315         transport_remove_device(dev);
3316         device_del(dev);
3317 delete_vport:
3318         transport_destroy_device(dev);
3319         spin_lock_irqsave(shost->host_lock, flags);
3320         list_del(&vport->peers);
3321         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3322         fc_host->npiv_vports_inuse--;
3323         spin_unlock_irqrestore(shost->host_lock, flags);
3324         put_device(dev->parent);
3325         kfree(vport);
3326
3327         return error;
3328 }
3329
3330 /**
3331  * fc_vport_create - Admin App or LLDD requests creation of a vport
3332  * @shost:      scsi host the virtual port is connected to.
3333  * @channel:    channel on shost port connected to.
3334  * @ids:        The world wide names, FC4 port roles, etc for
3335  *              the virtual port.
3336  *
3337  * Notes:
3338  *      This routine assumes no locks are held on entry.
3339  */
3340 struct fc_vport *
3341 fc_vport_create(struct Scsi_Host *shost, int channel,
3342         struct fc_vport_identifiers *ids)
3343 {
3344         int stat;
3345         struct fc_vport *vport;
3346
3347         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3348                  ids, &vport);
3349         return stat ? NULL : vport;
3350 }
3351 EXPORT_SYMBOL(fc_vport_create);
3352
3353 /**
3354  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3355  * @vport:      fc_vport to be terminated
3356  *
3357  * Calls the LLDD vport_delete() function, then deallocates and removes
3358  * the vport from the shost and object tree.
3359  *
3360  * Notes:
3361  *      This routine assumes no locks are held on entry.
3362  */
3363 int
3364 fc_vport_terminate(struct fc_vport *vport)
3365 {
3366         struct Scsi_Host *shost = vport_to_shost(vport);
3367         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3368         struct fc_internal *i = to_fc_internal(shost->transportt);
3369         struct device *dev = &vport->dev;
3370         unsigned long flags;
3371         int stat;
3372
3373         spin_lock_irqsave(shost->host_lock, flags);
3374         if (vport->flags & FC_VPORT_CREATING) {
3375                 spin_unlock_irqrestore(shost->host_lock, flags);
3376                 return -EBUSY;
3377         }
3378         if (vport->flags & (FC_VPORT_DEL)) {
3379                 spin_unlock_irqrestore(shost->host_lock, flags);
3380                 return -EALREADY;
3381         }
3382         vport->flags |= FC_VPORT_DELETING;
3383         spin_unlock_irqrestore(shost->host_lock, flags);
3384
3385         if (i->f->vport_delete)
3386                 stat = i->f->vport_delete(vport);
3387         else
3388                 stat = -ENOENT;
3389
3390         spin_lock_irqsave(shost->host_lock, flags);
3391         vport->flags &= ~FC_VPORT_DELETING;
3392         if (!stat) {
3393                 vport->flags |= FC_VPORT_DELETED;
3394                 list_del(&vport->peers);
3395                 fc_host->npiv_vports_inuse--;
3396                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3397         }
3398         spin_unlock_irqrestore(shost->host_lock, flags);
3399
3400         if (stat)
3401                 return stat;
3402
3403         if (dev->parent != &shost->shost_gendev)
3404                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3405         transport_remove_device(dev);
3406         device_del(dev);
3407         transport_destroy_device(dev);
3408
3409         /*
3410          * Removing our self-reference should mean our
3411          * release function gets called, which will drop the remaining
3412          * parent reference and free the data structure.
3413          */
3414         put_device(dev);                        /* for self-reference */
3415
3416         return 0; /* SUCCESS */
3417 }
3418 EXPORT_SYMBOL(fc_vport_terminate);
3419
3420 /**
3421  * fc_vport_sched_delete - workq-based delete request for a vport
3422  * @work:       vport to be deleted.
3423  */
3424 static void
3425 fc_vport_sched_delete(struct work_struct *work)
3426 {
3427         struct fc_vport *vport =
3428                 container_of(work, struct fc_vport, vport_delete_work);
3429         int stat;
3430
3431         stat = fc_vport_terminate(vport);
3432         if (stat)
3433                 dev_printk(KERN_ERR, vport->dev.parent,
3434                         "%s: %s could not be deleted created via "
3435                         "shost%d channel %d - error %d\n", __func__,
3436                         dev_name(&vport->dev), vport->shost->host_no,
3437                         vport->channel, stat);
3438 }
3439
3440
3441 /*
3442  * BSG support
3443  */
3444
3445
3446 /**
3447  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3448  * @job:        fc_bsg_job that is to be torn down
3449  */
3450 static void
3451 fc_destroy_bsgjob(struct fc_bsg_job *job)
3452 {
3453         unsigned long flags;
3454
3455         spin_lock_irqsave(&job->job_lock, flags);
3456         if (job->ref_cnt) {
3457                 spin_unlock_irqrestore(&job->job_lock, flags);
3458                 return;
3459         }
3460         spin_unlock_irqrestore(&job->job_lock, flags);
3461
3462         put_device(job->dev);   /* release reference for the request */
3463
3464         kfree(job->request_payload.sg_list);
3465         kfree(job->reply_payload.sg_list);
3466         kfree(job);
3467 }
3468
3469 /**
3470  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3471  *                  completed
3472  * @job:        fc_bsg_job that is complete
3473  */
3474 static void
3475 fc_bsg_jobdone(struct fc_bsg_job *job)
3476 {
3477         struct request *req = job->req;
3478         struct request *rsp = req->next_rq;
3479         int err;
3480
3481         err = job->req->errors = job->reply->result;
3482
3483         if (err < 0)
3484                 /* we're only returning the result field in the reply */
3485                 job->req->sense_len = sizeof(uint32_t);
3486         else
3487                 job->req->sense_len = job->reply_len;
3488
3489         /* we assume all request payload was transferred, residual == 0 */
3490         req->resid_len = 0;
3491
3492         if (rsp) {
3493                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3494
3495                 /* set reply (bidi) residual */
3496                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3497                                       rsp->resid_len);
3498         }
3499         blk_complete_request(req);
3500 }
3501
3502 /**
3503  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3504  * @rq:        BSG request that holds the job to be destroyed
3505  */
3506 static void fc_bsg_softirq_done(struct request *rq)
3507 {
3508         struct fc_bsg_job *job = rq->special;
3509         unsigned long flags;
3510
3511         spin_lock_irqsave(&job->job_lock, flags);
3512         job->state_flags |= FC_RQST_STATE_DONE;
3513         job->ref_cnt--;
3514         spin_unlock_irqrestore(&job->job_lock, flags);
3515
3516         blk_end_request_all(rq, rq->errors);
3517         fc_destroy_bsgjob(job);
3518 }
3519
3520 /**
3521  * fc_bsg_job_timeout - handler for when a bsg request timesout
3522  * @req:        request that timed out
3523  */
3524 static enum blk_eh_timer_return
3525 fc_bsg_job_timeout(struct request *req)
3526 {
3527         struct fc_bsg_job *job = (void *) req->special;
3528         struct Scsi_Host *shost = job->shost;
3529         struct fc_internal *i = to_fc_internal(shost->transportt);
3530         unsigned long flags;
3531         int err = 0, done = 0;
3532
3533         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3534                 return BLK_EH_RESET_TIMER;
3535
3536         spin_lock_irqsave(&job->job_lock, flags);
3537         if (job->state_flags & FC_RQST_STATE_DONE)
3538                 done = 1;
3539         else
3540                 job->ref_cnt++;
3541         spin_unlock_irqrestore(&job->job_lock, flags);
3542
3543         if (!done && i->f->bsg_timeout) {
3544                 /* call LLDD to abort the i/o as it has timed out */
3545                 err = i->f->bsg_timeout(job);
3546                 if (err == -EAGAIN) {
3547                         job->ref_cnt--;
3548                         return BLK_EH_RESET_TIMER;
3549                 } else if (err)
3550                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3551                                 "abort failed with status %d\n", err);
3552         }
3553
3554         /* the blk_end_sync_io() doesn't check the error */
3555         if (done)
3556                 return BLK_EH_NOT_HANDLED;
3557         else
3558                 return BLK_EH_HANDLED;
3559 }
3560
3561 static int
3562 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3563 {
3564         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3565
3566         BUG_ON(!req->nr_phys_segments);
3567
3568         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3569         if (!buf->sg_list)
3570                 return -ENOMEM;
3571         sg_init_table(buf->sg_list, req->nr_phys_segments);
3572         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3573         buf->payload_len = blk_rq_bytes(req);
3574         return 0;
3575 }
3576
3577
3578 /**
3579  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3580  *                   bsg request
3581  * @shost:      SCSI Host corresponding to the bsg object
3582  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3583  * @req:        BSG request that needs a job structure
3584  */
3585 static int
3586 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3587         struct request *req)
3588 {
3589         struct fc_internal *i = to_fc_internal(shost->transportt);
3590         struct request *rsp = req->next_rq;
3591         struct fc_bsg_job *job;
3592         int ret;
3593
3594         BUG_ON(req->special);
3595
3596         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3597                         GFP_KERNEL);
3598         if (!job)
3599                 return -ENOMEM;
3600
3601         /*
3602          * Note: this is a bit silly.
3603          * The request gets formatted as a SGIO v4 ioctl request, which
3604          * then gets reformatted as a blk request, which then gets
3605          * reformatted as a fc bsg request. And on completion, we have
3606          * to wrap return results such that SGIO v4 thinks it was a scsi
3607          * status.  I hope this was all worth it.
3608          */
3609
3610         req->special = job;
3611         job->shost = shost;
3612         job->rport = rport;
3613         job->req = req;
3614         if (i->f->dd_bsg_size)
3615                 job->dd_data = (void *)&job[1];
3616         spin_lock_init(&job->job_lock);
3617         job->request = (struct fc_bsg_request *)req->cmd;
3618         job->request_len = req->cmd_len;
3619         job->reply = req->sense;
3620         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3621                                                  * allocated */
3622         if (req->bio) {
3623                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3624                 if (ret)
3625                         goto failjob_rls_job;
3626         }
3627         if (rsp && rsp->bio) {
3628                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3629                 if (ret)
3630                         goto failjob_rls_rqst_payload;
3631         }
3632         job->job_done = fc_bsg_jobdone;
3633         if (rport)
3634                 job->dev = &rport->dev;
3635         else
3636                 job->dev = &shost->shost_gendev;
3637         get_device(job->dev);           /* take a reference for the request */
3638
3639         job->ref_cnt = 1;
3640
3641         return 0;
3642
3643
3644 failjob_rls_rqst_payload:
3645         kfree(job->request_payload.sg_list);
3646 failjob_rls_job:
3647         kfree(job);
3648         return -ENOMEM;
3649 }
3650
3651
3652 enum fc_dispatch_result {
3653         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3654         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3655         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3656 };
3657
3658
3659 /**
3660  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3661  * @q:          fc host request queue
3662  * @shost:      scsi host rport attached to
3663  * @job:        bsg job to be processed
3664  */
3665 static enum fc_dispatch_result
3666 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3667                          struct fc_bsg_job *job)
3668 {
3669         struct fc_internal *i = to_fc_internal(shost->transportt);
3670         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3671         int ret;
3672
3673         /* Validate the host command */
3674         switch (job->request->msgcode) {
3675         case FC_BSG_HST_ADD_RPORT:
3676                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3677                 break;
3678
3679         case FC_BSG_HST_DEL_RPORT:
3680                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3681                 break;
3682
3683         case FC_BSG_HST_ELS_NOLOGIN:
3684                 cmdlen += sizeof(struct fc_bsg_host_els);
3685                 /* there better be a xmt and rcv payloads */
3686                 if ((!job->request_payload.payload_len) ||
3687                     (!job->reply_payload.payload_len)) {
3688                         ret = -EINVAL;
3689                         goto fail_host_msg;
3690                 }
3691                 break;
3692
3693         case FC_BSG_HST_CT:
3694                 cmdlen += sizeof(struct fc_bsg_host_ct);
3695                 /* there better be xmt and rcv payloads */
3696                 if ((!job->request_payload.payload_len) ||
3697                     (!job->reply_payload.payload_len)) {
3698                         ret = -EINVAL;
3699                         goto fail_host_msg;
3700                 }
3701                 break;
3702
3703         case FC_BSG_HST_VENDOR:
3704                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3705                 if ((shost->hostt->vendor_id == 0L) ||
3706                     (job->request->rqst_data.h_vendor.vendor_id !=
3707                         shost->hostt->vendor_id)) {
3708                         ret = -ESRCH;
3709                         goto fail_host_msg;
3710                 }
3711                 break;
3712
3713         default:
3714                 ret = -EBADR;
3715                 goto fail_host_msg;
3716         }
3717
3718         /* check if we really have all the request data needed */
3719         if (job->request_len < cmdlen) {
3720                 ret = -ENOMSG;
3721                 goto fail_host_msg;
3722         }
3723
3724         ret = i->f->bsg_request(job);
3725         if (!ret)
3726                 return FC_DISPATCH_UNLOCKED;
3727
3728 fail_host_msg:
3729         /* return the errno failure code as the only status */
3730         BUG_ON(job->reply_len < sizeof(uint32_t));
3731         job->reply->reply_payload_rcv_len = 0;
3732         job->reply->result = ret;
3733         job->reply_len = sizeof(uint32_t);
3734         fc_bsg_jobdone(job);
3735         return FC_DISPATCH_UNLOCKED;
3736 }
3737
3738
3739 /*
3740  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3741  * @rport:      rport to be restarted
3742  */
3743 static void
3744 fc_bsg_goose_queue(struct fc_rport *rport)
3745 {
3746         int flagset;
3747         unsigned long flags;
3748
3749         if (!rport->rqst_q)
3750                 return;
3751
3752         get_device(&rport->dev);
3753
3754         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3755         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3756                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3757         if (flagset)
3758                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3759         __blk_run_queue(rport->rqst_q);
3760         if (flagset)
3761                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3762         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3763
3764         put_device(&rport->dev);
3765 }
3766
3767
3768 /**
3769  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3770  * @q:          rport request queue
3771  * @shost:      scsi host rport attached to
3772  * @rport:      rport request destined to
3773  * @job:        bsg job to be processed
3774  */
3775 static enum fc_dispatch_result
3776 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3777                          struct fc_rport *rport, struct fc_bsg_job *job)
3778 {
3779         struct fc_internal *i = to_fc_internal(shost->transportt);
3780         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3781         int ret;
3782
3783         /* Validate the rport command */
3784         switch (job->request->msgcode) {
3785         case FC_BSG_RPT_ELS:
3786                 cmdlen += sizeof(struct fc_bsg_rport_els);
3787                 goto check_bidi;
3788
3789         case FC_BSG_RPT_CT:
3790                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3791 check_bidi:
3792                 /* there better be xmt and rcv payloads */
3793                 if ((!job->request_payload.payload_len) ||
3794                     (!job->reply_payload.payload_len)) {
3795                         ret = -EINVAL;
3796                         goto fail_rport_msg;
3797                 }
3798                 break;
3799         default:
3800                 ret = -EBADR;
3801                 goto fail_rport_msg;
3802         }
3803
3804         /* check if we really have all the request data needed */
3805         if (job->request_len < cmdlen) {
3806                 ret = -ENOMSG;
3807                 goto fail_rport_msg;
3808         }
3809
3810         ret = i->f->bsg_request(job);
3811         if (!ret)
3812                 return FC_DISPATCH_UNLOCKED;
3813
3814 fail_rport_msg:
3815         /* return the errno failure code as the only status */
3816         BUG_ON(job->reply_len < sizeof(uint32_t));
3817         job->reply->reply_payload_rcv_len = 0;
3818         job->reply->result = ret;
3819         job->reply_len = sizeof(uint32_t);
3820         fc_bsg_jobdone(job);
3821         return FC_DISPATCH_UNLOCKED;
3822 }
3823
3824
3825 /**
3826  * fc_bsg_request_handler - generic handler for bsg requests
3827  * @q:          request queue to manage
3828  * @shost:      Scsi_Host related to the bsg object
3829  * @rport:      FC remote port related to the bsg object (optional)
3830  * @dev:        device structure for bsg object
3831  */
3832 static void
3833 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3834                        struct fc_rport *rport, struct device *dev)
3835 {
3836         struct request *req;
3837         struct fc_bsg_job *job;
3838         enum fc_dispatch_result ret;
3839
3840         if (!get_device(dev))
3841                 return;
3842
3843         while (!blk_queue_plugged(q)) {
3844                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3845                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3846                         break;
3847
3848                 req = blk_fetch_request(q);
3849                 if (!req)
3850                         break;
3851
3852                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3853                         req->errors = -ENXIO;
3854                         spin_unlock_irq(q->queue_lock);
3855                         blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3856                         spin_lock_irq(q->queue_lock);
3857                         continue;
3858                 }
3859
3860                 spin_unlock_irq(q->queue_lock);
3861
3862                 ret = fc_req_to_bsgjob(shost, rport, req);
3863                 if (ret) {
3864                         req->errors = ret;
3865                         blk_end_request(req, ret, blk_rq_bytes(req));
3866                         spin_lock_irq(q->queue_lock);
3867                         continue;
3868                 }
3869
3870                 job = req->special;
3871
3872                 /* check if we have the msgcode value at least */
3873                 if (job->request_len < sizeof(uint32_t)) {
3874                         BUG_ON(job->reply_len < sizeof(uint32_t));
3875                         job->reply->reply_payload_rcv_len = 0;
3876                         job->reply->result = -ENOMSG;
3877                         job->reply_len = sizeof(uint32_t);
3878                         fc_bsg_jobdone(job);
3879                         spin_lock_irq(q->queue_lock);
3880                         continue;
3881                 }
3882
3883                 /* the dispatch routines will unlock the queue_lock */
3884                 if (rport)
3885                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3886                 else
3887                         ret = fc_bsg_host_dispatch(q, shost, job);
3888
3889                 /* did dispatcher hit state that can't process any more */
3890                 if (ret == FC_DISPATCH_BREAK)
3891                         break;
3892
3893                 /* did dispatcher had released the lock */
3894                 if (ret == FC_DISPATCH_UNLOCKED)
3895                         spin_lock_irq(q->queue_lock);
3896         }
3897
3898         spin_unlock_irq(q->queue_lock);
3899         put_device(dev);
3900         spin_lock_irq(q->queue_lock);
3901 }
3902
3903
3904 /**
3905  * fc_bsg_host_handler - handler for bsg requests for a fc host
3906  * @q:          fc host request queue
3907  */
3908 static void
3909 fc_bsg_host_handler(struct request_queue *q)
3910 {
3911         struct Scsi_Host *shost = q->queuedata;
3912
3913         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3914 }
3915
3916
3917 /**
3918  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3919  * @q:          rport request queue
3920  */
3921 static void
3922 fc_bsg_rport_handler(struct request_queue *q)
3923 {
3924         struct fc_rport *rport = q->queuedata;
3925         struct Scsi_Host *shost = rport_to_shost(rport);
3926
3927         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3928 }
3929
3930
3931 /**
3932  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3933  * @shost:      shost for fc_host
3934  * @fc_host:    fc_host adding the structures to
3935  */
3936 static int
3937 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3938 {
3939         struct device *dev = &shost->shost_gendev;
3940         struct fc_internal *i = to_fc_internal(shost->transportt);
3941         struct request_queue *q;
3942         int err;
3943         char bsg_name[20];
3944
3945         fc_host->rqst_q = NULL;
3946
3947         if (!i->f->bsg_request)
3948                 return -ENOTSUPP;
3949
3950         snprintf(bsg_name, sizeof(bsg_name),
3951                  "fc_host%d", shost->host_no);
3952
3953         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3954         if (!q) {
3955                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3956                                 "initialize - no request queue\n",
3957                                  shost->host_no);
3958                 return -ENOMEM;
3959         }
3960
3961         q->queuedata = shost;
3962         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3963         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3964         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3965         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3966
3967         err = bsg_register_queue(q, dev, bsg_name, NULL);
3968         if (err) {
3969                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3970                                 "initialize - register queue\n",
3971                                 shost->host_no);
3972                 blk_cleanup_queue(q);
3973                 return err;
3974         }
3975
3976         fc_host->rqst_q = q;
3977         return 0;
3978 }
3979
3980
3981 /**
3982  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3983  * @shost:      shost that rport is attached to
3984  * @rport:      rport that the bsg hooks are being attached to
3985  */
3986 static int
3987 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3988 {
3989         struct device *dev = &rport->dev;
3990         struct fc_internal *i = to_fc_internal(shost->transportt);
3991         struct request_queue *q;
3992         int err;
3993
3994         rport->rqst_q = NULL;
3995
3996         if (!i->f->bsg_request)
3997                 return -ENOTSUPP;
3998
3999         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4000         if (!q) {
4001                 printk(KERN_ERR "%s: bsg interface failed to "
4002                                 "initialize - no request queue\n",
4003                                  dev->kobj.name);
4004                 return -ENOMEM;
4005         }
4006
4007         q->queuedata = rport;
4008         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4009         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4010         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4011         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4012
4013         err = bsg_register_queue(q, dev, NULL, NULL);
4014         if (err) {
4015                 printk(KERN_ERR "%s: bsg interface failed to "
4016                                 "initialize - register queue\n",
4017                                  dev->kobj.name);
4018                 blk_cleanup_queue(q);
4019                 return err;
4020         }
4021
4022         rport->rqst_q = q;
4023         return 0;
4024 }
4025
4026
4027 /**
4028  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4029  * @q:  the request_queue that is to be torn down.
4030  */
4031 static void
4032 fc_bsg_remove(struct request_queue *q)
4033 {
4034         if (q) {
4035                 bsg_unregister_queue(q);
4036                 blk_cleanup_queue(q);
4037         }
4038 }
4039
4040
4041 /* Original Author:  Martin Hicks */
4042 MODULE_AUTHOR("James Smart");
4043 MODULE_DESCRIPTION("FC Transport Attributes");
4044 MODULE_LICENSE("GPL");
4045
4046 module_init(fc_transport_init);
4047 module_exit(fc_transport_exit);