SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include <linux/netlink.h>
  36 #include <net/netlink.h>
  37 #include <scsi/scsi_netlink_fc.h>
  38 #include <scsi/scsi_bsg_fc.h>
  39 #include "scsi_priv.h"
  40 #include "scsi_transport_fc_internal.h"
  41
  42 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  43 static void fc_vport_sched_delete(struct work_struct *work);
  44 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  45         struct device *pdev, struct fc_vport_identifiers  *ids,
  46         struct fc_vport **vport);
  47 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  48 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  49 static void fc_bsg_remove(struct request_queue *);
  50 static void fc_bsg_goose_queue(struct fc_rport *);
  51
  52 /*
  53  * Redefine so that we can have same named attributes in the
  54  * sdev/starget/host objects.
  55  */
  56 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  57 struct device_attribute device_attr_##_prefix##_##_name =       \
  58         __ATTR(_name,_mode,_show,_store)
  59
  60 #define fc_enum_name_search(title, table_type, table)                   \
  61 static const char *get_fc_##title##_name(enum table_type table_key)     \
  62 {                                                                       \
  63         int i;                                                          \
  64         char *name = NULL;                                              \
  65                                                                         \
  66         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  67                 if (table[i].value == table_key) {                      \
  68                         name = table[i].name;                           \
  69                         break;                                          \
  70                 }                                                       \
  71         }                                                               \
  72         return name;                                                    \
  73 }
  74
  75 #define fc_enum_name_match(title, table_type, table)                    \
  76 static int get_fc_##title##_match(const char *table_key,                \
  77                 enum table_type *value)                                 \
  78 {                                                                       \
  79         int i;                                                          \
  80                                                                         \
  81         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  82                 if (strncmp(table_key, table[i].name,                   \
  83                                 table[i].matchlen) == 0) {              \
  84                         *value = table[i].value;                        \
  85                         return 0; /* success */                         \
  86                 }                                                       \
  87         }                                                               \
  88         return 1; /* failure */                                         \
  89 }
  90
  91
  92 /* Convert fc_port_type values to ascii string name */
  93 static struct {
  94         enum fc_port_type       value;
  95         char                    *name;
  96 } fc_port_type_names[] = {
  97         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  98         { FC_PORTTYPE_OTHER,            "Other" },
  99         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 100         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 101         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 102         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 103         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 104         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 105 };
 106 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 107 #define FC_PORTTYPE_MAX_NAMELEN         50
 108
 109 /* Reuse fc_port_type enum function for vport_type */
 110 #define get_fc_vport_type_name get_fc_port_type_name
 111
 112
 113 /* Convert fc_host_event_code values to ascii string name */
 114 static const struct {
 115         enum fc_host_event_code         value;
 116         char                            *name;
 117 } fc_host_event_code_names[] = {
 118         { FCH_EVT_LIP,                  "lip" },
 119         { FCH_EVT_LINKUP,               "link_up" },
 120         { FCH_EVT_LINKDOWN,             "link_down" },
 121         { FCH_EVT_LIPRESET,             "lip_reset" },
 122         { FCH_EVT_RSCN,                 "rscn" },
 123         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 124         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 125         { FCH_EVT_PORT_ONLINE,          "port_online" },
 126         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 127         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 128         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 129         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 130 };
 131 fc_enum_name_search(host_event_code, fc_host_event_code,
 132                 fc_host_event_code_names)
 133 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 134
 135
 136 /* Convert fc_port_state values to ascii string name */
 137 static struct {
 138         enum fc_port_state      value;
 139         char                    *name;
 140 } fc_port_state_names[] = {
 141         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 142         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 143         { FC_PORTSTATE_ONLINE,          "Online" },
 144         { FC_PORTSTATE_OFFLINE,         "Offline" },
 145         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 146         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 147         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 148         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 149         { FC_PORTSTATE_ERROR,           "Error" },
 150         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 151         { FC_PORTSTATE_DELETED,         "Deleted" },
 152 };
 153 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 154 #define FC_PORTSTATE_MAX_NAMELEN        20
 155
 156
 157 /* Convert fc_vport_state values to ascii string name */
 158 static struct {
 159         enum fc_vport_state     value;
 160         char                    *name;
 161 } fc_vport_state_names[] = {
 162         { FC_VPORT_UNKNOWN,             "Unknown" },
 163         { FC_VPORT_ACTIVE,              "Active" },
 164         { FC_VPORT_DISABLED,            "Disabled" },
 165         { FC_VPORT_LINKDOWN,            "Linkdown" },
 166         { FC_VPORT_INITIALIZING,        "Initializing" },
 167         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 168         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 169         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 170         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 171         { FC_VPORT_FAILED,              "VPort Failed" },
 172 };
 173 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 174 #define FC_VPORTSTATE_MAX_NAMELEN       24
 175
 176 /* Reuse fc_vport_state enum function for vport_last_state */
 177 #define get_fc_vport_last_state_name get_fc_vport_state_name
 178
 179
 180 /* Convert fc_tgtid_binding_type values to ascii string name */
 181 static const struct {
 182         enum fc_tgtid_binding_type      value;
 183         char                            *name;
 184         int                             matchlen;
 185 } fc_tgtid_binding_type_names[] = {
 186         { FC_TGTID_BIND_NONE, "none", 4 },
 187         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 188         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 189         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 190 };
 191 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 192                 fc_tgtid_binding_type_names)
 193 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 194                 fc_tgtid_binding_type_names)
 195 #define FC_BINDTYPE_MAX_NAMELEN 30
 196
 197
 198 #define fc_bitfield_name_search(title, table)                   \
 199 static ssize_t                                                  \
 200 get_fc_##title##_names(u32 table_key, char *buf)                \
 201 {                                                               \
 202         char *prefix = "";                                      \
 203         ssize_t len = 0;                                        \
 204         int i;                                                  \
 205                                                                 \
 206         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 207                 if (table[i].value & table_key) {               \
 208                         len += sprintf(buf + len, "%s%s",       \
 209                                 prefix, table[i].name);         \
 210                         prefix = ", ";                          \
 211                 }                                               \
 212         }                                                       \
 213         len += sprintf(buf + len, "\n");                        \
 214         return len;                                             \
 215 }
 216
 217
 218 /* Convert FC_COS bit values to ascii string name */
 219 static const struct {
 220         u32                     value;
 221         char                    *name;
 222 } fc_cos_names[] = {
 223         { FC_COS_CLASS1,        "Class 1" },
 224         { FC_COS_CLASS2,        "Class 2" },
 225         { FC_COS_CLASS3,        "Class 3" },
 226         { FC_COS_CLASS4,        "Class 4" },
 227         { FC_COS_CLASS6,        "Class 6" },
 228 };
 229 fc_bitfield_name_search(cos, fc_cos_names)
 230
 231
 232 /* Convert FC_PORTSPEED bit values to ascii string name */
 233 static const struct {
 234         u32                     value;
 235         char                    *name;
 236 } fc_port_speed_names[] = {
 237         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 238         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 239         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 240         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 241         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 242         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 243         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 244 };
 245 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 246
 247
 248 static int
 249 show_fc_fc4s (char *buf, u8 *fc4_list)
 250 {
 251         int i, len=0;
 252
 253         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 254                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 255         len += sprintf(buf + len, "\n");
 256         return len;
 257 }
 258
 259
 260 /* Convert FC_PORT_ROLE bit values to ascii string name */
 261 static const struct {
 262         u32                     value;
 263         char                    *name;
 264 } fc_port_role_names[] = {
 265         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 266         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 267         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 268 };
 269 fc_bitfield_name_search(port_roles, fc_port_role_names)
 270
 271 /*
 272  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 273  */
 274 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 275 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 276 #define FC_FPORT_PORTID                 0x00000e
 277 #define FC_FABCTLR_PORTID               0x00000d
 278 #define FC_DIRSRVR_PORTID               0x00000c
 279 #define FC_TIMESRVR_PORTID              0x00000b
 280 #define FC_MGMTSRVR_PORTID              0x00000a
 281
 282
 283 static void fc_timeout_deleted_rport(struct work_struct *work);
 284 static void fc_timeout_fail_rport_io(struct work_struct *work);
 285 static void fc_scsi_scan_rport(struct work_struct *work);
 286
 287 /*
 288  * Attribute counts pre object type...
 289  * Increase these values if you add attributes
 290  */
 291 #define FC_STARGET_NUM_ATTRS    3
 292 #define FC_RPORT_NUM_ATTRS      10
 293 #define FC_VPORT_NUM_ATTRS      9
 294 #define FC_HOST_NUM_ATTRS       22
 295
 296 struct fc_internal {
 297         struct scsi_transport_template t;
 298         struct fc_function_template *f;
 299
 300         /*
 301          * For attributes : each object has :
 302          *   An array of the actual attributes structures
 303          *   An array of null-terminated pointers to the attribute
 304          *     structures - used for mid-layer interaction.
 305          *
 306          * The attribute containers for the starget and host are are
 307          * part of the midlayer. As the remote port is specific to the
 308          * fc transport, we must provide the attribute container.
 309          */
 310         struct device_attribute private_starget_attrs[
 311                                                         FC_STARGET_NUM_ATTRS];
 312         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 313
 314         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 315         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 316
 317         struct transport_container rport_attr_cont;
 318         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 319         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 320
 321         struct transport_container vport_attr_cont;
 322         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 323         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 324 };
 325
 326 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 327
 328 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 329                            struct device *cdev)
 330 {
 331         struct scsi_target *starget = to_scsi_target(dev);
 332         struct fc_rport *rport = starget_to_rport(starget);
 333
 334         /*
 335          * if parent is remote port, use values from remote port.
 336          * Otherwise, this host uses the fc_transport, but not the
 337          * remote port interface. As such, initialize to known non-values.
 338          */
 339         if (rport) {
 340                 fc_starget_node_name(starget) = rport->node_name;
 341                 fc_starget_port_name(starget) = rport->port_name;
 342                 fc_starget_port_id(starget) = rport->port_id;
 343         } else {
 344                 fc_starget_node_name(starget) = -1;
 345                 fc_starget_port_name(starget) = -1;
 346                 fc_starget_port_id(starget) = -1;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 353                                "fc_transport",
 354                                fc_target_setup,
 355                                NULL,
 356                                NULL);
 357
 358 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 359                          struct device *cdev)
 360 {
 361         struct Scsi_Host *shost = dev_to_shost(dev);
 362         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 363
 364         /*
 365          * Set default values easily detected by the midlayer as
 366          * failure cases.  The scsi lldd is responsible for initializing
 367          * all transport attributes to valid values per host.
 368          */
 369         fc_host->node_name = -1;
 370         fc_host->port_name = -1;
 371         fc_host->permanent_port_name = -1;
 372         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 373         memset(fc_host->supported_fc4s, 0,
 374                 sizeof(fc_host->supported_fc4s));
 375         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 376         fc_host->maxframe_size = -1;
 377         fc_host->max_npiv_vports = 0;
 378         memset(fc_host->serial_number, 0,
 379                 sizeof(fc_host->serial_number));
 380
 381         fc_host->port_id = -1;
 382         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 383         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 384         memset(fc_host->active_fc4s, 0,
 385                 sizeof(fc_host->active_fc4s));
 386         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 387         fc_host->fabric_name = -1;
 388         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 389         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 390
 391         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 392
 393         INIT_LIST_HEAD(&fc_host->rports);
 394         INIT_LIST_HEAD(&fc_host->rport_bindings);
 395         INIT_LIST_HEAD(&fc_host->vports);
 396         fc_host->next_rport_number = 0;
 397         fc_host->next_target_id = 0;
 398         fc_host->next_vport_number = 0;
 399         fc_host->npiv_vports_inuse = 0;
 400
 401         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 402                  "fc_wq_%d", shost->host_no);
 403         fc_host->work_q = create_singlethread_workqueue(
 404                                         fc_host->work_q_name);
 405         if (!fc_host->work_q)
 406                 return -ENOMEM;
 407
 408         snprintf(fc_host->devloss_work_q_name,
 409                  sizeof(fc_host->devloss_work_q_name),
 410                  "fc_dl_%d", shost->host_no);
 411         fc_host->devloss_work_q = create_singlethread_workqueue(
 412                                         fc_host->devloss_work_q_name);
 413         if (!fc_host->devloss_work_q) {
 414                 destroy_workqueue(fc_host->work_q);
 415                 fc_host->work_q = NULL;
 416                 return -ENOMEM;
 417         }
 418
 419         fc_bsg_hostadd(shost, fc_host);
 420         /* ignore any bsg add error - we just can't do sgio */
 421
 422         return 0;
 423 }
 424
 425 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 426                          struct device *cdev)
 427 {
 428         struct Scsi_Host *shost = dev_to_shost(dev);
 429         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 430
 431         fc_bsg_remove(fc_host->rqst_q);
 432         return 0;
 433 }
 434
 435 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 436                                "fc_host",
 437                                fc_host_setup,
 438                                fc_host_remove,
 439                                NULL);
 440
 441 /*
 442  * Setup and Remove actions for remote ports are handled
 443  * in the service functions below.
 444  */
 445 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 446                                "fc_remote_ports",
 447                                NULL,
 448                                NULL,
 449                                NULL);
 450
 451 /*
 452  * Setup and Remove actions for virtual ports are handled
 453  * in the service functions below.
 454  */
 455 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 456                                "fc_vports",
 457                                NULL,
 458                                NULL,
 459                                NULL);
 460
 461 /*
 462  * Module Parameters
 463  */
 464
 465 /*
 466  * dev_loss_tmo: the default number of seconds that the FC transport
 467  *   should insulate the loss of a remote port.
 468  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 469  */
 470 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 471
 472 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 473 MODULE_PARM_DESC(dev_loss_tmo,
 474                  "Maximum number of seconds that the FC transport should"
 475                  " insulate the loss of a remote port. Once this value is"
 476                  " exceeded, the scsi target is removed. Value should be"
 477                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 478
 479 /*
 480  * Netlink Infrastructure
 481  */
 482
 483 static atomic_t fc_event_seq;
 484
 485 /**
 486  * fc_get_event_number - Obtain the next sequential FC event number
 487  *
 488  * Notes:
 489  *   We could have inlined this, but it would have required fc_event_seq to
 490  *   be exposed. For now, live with the subroutine call.
 491  *   Atomic used to avoid lock/unlock...
 492  */
 493 u32
 494 fc_get_event_number(void)
 495 {
 496         return atomic_add_return(1, &fc_event_seq);
 497 }
 498 EXPORT_SYMBOL(fc_get_event_number);
 499
 500
 501 /**
 502  * fc_host_post_event - called to post an even on an fc_host.
 503  * @shost:              host the event occurred on
 504  * @event_number:       fc event number obtained from get_fc_event_number()
 505  * @event_code:         fc_host event being posted
 506  * @event_data:         32bits of data for the event being posted
 507  *
 508  * Notes:
 509  *      This routine assumes no locks are held on entry.
 510  */
 511 void
 512 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 513                 enum fc_host_event_code event_code, u32 event_data)
 514 {
 515         struct sk_buff *skb;
 516         struct nlmsghdr *nlh;
 517         struct fc_nl_event *event;
 518         const char *name;
 519         u32 len, skblen;
 520         int err;
 521
 522         if (!scsi_nl_sock) {
 523                 err = -ENOENT;
 524                 goto send_fail;
 525         }
 526
 527         len = FC_NL_MSGALIGN(sizeof(*event));
 528         skblen = NLMSG_SPACE(len);
 529
 530         skb = alloc_skb(skblen, GFP_KERNEL);
 531         if (!skb) {
 532                 err = -ENOBUFS;
 533                 goto send_fail;
 534         }
 535
 536         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 537                                 skblen - sizeof(*nlh), 0);
 538         if (!nlh) {
 539                 err = -ENOBUFS;
 540                 goto send_fail_skb;
 541         }
 542         event = NLMSG_DATA(nlh);
 543
 544         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 545                                 FC_NL_ASYNC_EVENT, len);
 546         event->seconds = get_seconds();
 547         event->vendor_id = 0;
 548         event->host_no = shost->host_no;
 549         event->event_datalen = sizeof(u32);     /* bytes */
 550         event->event_num = event_number;
 551         event->event_code = event_code;
 552         event->event_data = event_data;
 553
 554         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 555                         GFP_KERNEL);
 556         return;
 557
 558 send_fail_skb:
 559         kfree_skb(skb);
 560 send_fail:
 561         name = get_fc_host_event_code_name(event_code);
 562         printk(KERN_WARNING
 563                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 564                 __func__, shost->host_no,
 565                 (name) ? name : "<unknown>", event_data, err);
 566         return;
 567 }
 568 EXPORT_SYMBOL(fc_host_post_event);
 569
 570
 571 /**
 572  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 573  * @shost:              host the event occurred on
 574  * @event_number:       fc event number obtained from get_fc_event_number()
 575  * @data_len:           amount, in bytes, of vendor unique data
 576  * @data_buf:           pointer to vendor unique data
 577  * @vendor_id:          Vendor id
 578  *
 579  * Notes:
 580  *      This routine assumes no locks are held on entry.
 581  */
 582 void
 583 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 584                 u32 data_len, char * data_buf, u64 vendor_id)
 585 {
 586         struct sk_buff *skb;
 587         struct nlmsghdr *nlh;
 588         struct fc_nl_event *event;
 589         u32 len, skblen;
 590         int err;
 591
 592         if (!scsi_nl_sock) {
 593                 err = -ENOENT;
 594                 goto send_vendor_fail;
 595         }
 596
 597         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 598         skblen = NLMSG_SPACE(len);
 599
 600         skb = alloc_skb(skblen, GFP_KERNEL);
 601         if (!skb) {
 602                 err = -ENOBUFS;
 603                 goto send_vendor_fail;
 604         }
 605
 606         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 607                                 skblen - sizeof(*nlh), 0);
 608         if (!nlh) {
 609                 err = -ENOBUFS;
 610                 goto send_vendor_fail_skb;
 611         }
 612         event = NLMSG_DATA(nlh);
 613
 614         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 615                                 FC_NL_ASYNC_EVENT, len);
 616         event->seconds = get_seconds();
 617         event->vendor_id = vendor_id;
 618         event->host_no = shost->host_no;
 619         event->event_datalen = data_len;        /* bytes */
 620         event->event_num = event_number;
 621         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 622         memcpy(&event->event_data, data_buf, data_len);
 623
 624         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 625                         GFP_KERNEL);
 626         return;
 627
 628 send_vendor_fail_skb:
 629         kfree_skb(skb);
 630 send_vendor_fail:
 631         printk(KERN_WARNING
 632                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 633                 __func__, shost->host_no, err);
 634         return;
 635 }
 636 EXPORT_SYMBOL(fc_host_post_vendor_event);
 637
 638
 639
 640 static __init int fc_transport_init(void)
 641 {
 642         int error;
 643
 644         atomic_set(&fc_event_seq, 0);
 645
 646         error = transport_class_register(&fc_host_class);
 647         if (error)
 648                 return error;
 649         error = transport_class_register(&fc_vport_class);
 650         if (error)
 651                 return error;
 652         error = transport_class_register(&fc_rport_class);
 653         if (error)
 654                 return error;
 655         return transport_class_register(&fc_transport_class);
 656 }
 657
 658 static void __exit fc_transport_exit(void)
 659 {
 660         transport_class_unregister(&fc_transport_class);
 661         transport_class_unregister(&fc_rport_class);
 662         transport_class_unregister(&fc_host_class);
 663         transport_class_unregister(&fc_vport_class);
 664 }
 665
 666 /*
 667  * FC Remote Port Attribute Management
 668  */
 669
 670 #define fc_rport_show_function(field, format_string, sz, cast)          \
 671 static ssize_t                                                          \
 672 show_fc_rport_##field (struct device *dev,                              \
 673                        struct device_attribute *attr, char *buf)        \
 674 {                                                                       \
 675         struct fc_rport *rport = transport_class_to_rport(dev);         \
 676         struct Scsi_Host *shost = rport_to_shost(rport);                \
 677         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 678         if ((i->f->get_rport_##field) &&                                \
 679             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 680               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 681               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 682                 i->f->get_rport_##field(rport);                         \
 683         return snprintf(buf, sz, format_string, cast rport->field);     \
 684 }
 685
 686 #define fc_rport_store_function(field)                                  \
 687 static ssize_t                                                          \
 688 store_fc_rport_##field(struct device *dev,                              \
 689                        struct device_attribute *attr,                   \
 690                        const char *buf, size_t count)                   \
 691 {                                                                       \
 692         int val;                                                        \
 693         struct fc_rport *rport = transport_class_to_rport(dev);         \
 694         struct Scsi_Host *shost = rport_to_shost(rport);                \
 695         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 696         char *cp;                                                       \
 697         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 698             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 699             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 700                 return -EBUSY;                                          \
 701         val = simple_strtoul(buf, &cp, 0);                              \
 702         if (*cp && (*cp != '\n'))                                       \
 703                 return -EINVAL;                                         \
 704         i->f->set_rport_##field(rport, val);                            \
 705         return count;                                                   \
 706 }
 707
 708 #define fc_rport_rd_attr(field, format_string, sz)                      \
 709         fc_rport_show_function(field, format_string, sz, )              \
 710 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 711                          show_fc_rport_##field, NULL)
 712
 713 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 714         fc_rport_show_function(field, format_string, sz, (cast))        \
 715 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 716                           show_fc_rport_##field, NULL)
 717
 718 #define fc_rport_rw_attr(field, format_string, sz)                      \
 719         fc_rport_show_function(field, format_string, sz, )              \
 720         fc_rport_store_function(field)                                  \
 721 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 722                         show_fc_rport_##field,                          \
 723                         store_fc_rport_##field)
 724
 725
 726 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 727 static ssize_t                                                          \
 728 show_fc_rport_##field (struct device *dev,                              \
 729                        struct device_attribute *attr, char *buf)        \
 730 {                                                                       \
 731         struct fc_rport *rport = transport_class_to_rport(dev);         \
 732         return snprintf(buf, sz, format_string, cast rport->field);     \
 733 }
 734
 735 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 736         fc_private_rport_show_function(field, format_string, sz, )      \
 737 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 738                          show_fc_rport_##field, NULL)
 739
 740 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 741         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 742 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 743                           show_fc_rport_##field, NULL)
 744
 745
 746 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 747 static ssize_t                                                          \
 748 show_fc_rport_##title (struct device *dev,                              \
 749                        struct device_attribute *attr, char *buf)        \
 750 {                                                                       \
 751         struct fc_rport *rport = transport_class_to_rport(dev);         \
 752         const char *name;                                               \
 753         name = get_fc_##title##_name(rport->title);                     \
 754         if (!name)                                                      \
 755                 return -EINVAL;                                         \
 756         return snprintf(buf, maxlen, "%s\n", name);                     \
 757 }                                                                       \
 758 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 759                         show_fc_rport_##title, NULL)
 760
 761
 762 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 763         i->private_rport_attrs[count] = device_attr_rport_##field; \
 764         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 765         i->private_rport_attrs[count].store = NULL;                     \
 766         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 767         if (i->f->show_rport_##field)                                   \
 768                 count++
 769
 770 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 771         i->private_rport_attrs[count] = device_attr_rport_##field; \
 772         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 773         i->private_rport_attrs[count].store = NULL;                     \
 774         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 775         count++
 776
 777 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 778         i->private_rport_attrs[count] = device_attr_rport_##field; \
 779         if (!i->f->set_rport_##field) {                                 \
 780                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 781                 i->private_rport_attrs[count].store = NULL;             \
 782         }                                                               \
 783         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 784         if (i->f->show_rport_##field)                                   \
 785                 count++
 786
 787 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 788 {                                                                       \
 789         i->private_rport_attrs[count] = device_attr_rport_##field; \
 790         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 791         count++;                                                        \
 792 }
 793
 794
 795 /* The FC Transport Remote Port Attributes: */
 796
 797 /* Fixed Remote Port Attributes */
 798
 799 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 800
 801 static ssize_t
 802 show_fc_rport_supported_classes (struct device *dev,
 803                                  struct device_attribute *attr, char *buf)
 804 {
 805         struct fc_rport *rport = transport_class_to_rport(dev);
 806         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 807                 return snprintf(buf, 20, "unspecified\n");
 808         return get_fc_cos_names(rport->supported_classes, buf);
 809 }
 810 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 811                 show_fc_rport_supported_classes, NULL);
 812
 813 /* Dynamic Remote Port Attributes */
 814
 815 /*
 816  * dev_loss_tmo attribute
 817  */
 818 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 819 static ssize_t
 820 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 821                             const char *buf, size_t count)
 822 {
 823         int val;
 824         struct fc_rport *rport = transport_class_to_rport(dev);
 825         struct Scsi_Host *shost = rport_to_shost(rport);
 826         struct fc_internal *i = to_fc_internal(shost->transportt);
 827         char *cp;
 828         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 829             (rport->port_state == FC_PORTSTATE_DELETED) ||
 830             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 831                 return -EBUSY;
 832         val = simple_strtoul(buf, &cp, 0);
 833         if ((*cp && (*cp != '\n')) ||
 834             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 835                 return -EINVAL;
 836         i->f->set_rport_dev_loss_tmo(rport, val);
 837         return count;
 838 }
 839 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 840                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 841
 842
 843 /* Private Remote Port Attributes */
 844
 845 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 846 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 847 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 848
 849 static ssize_t
 850 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 851                      char *buf)
 852 {
 853         struct fc_rport *rport = transport_class_to_rport(dev);
 854
 855         /* identify any roles that are port_id specific */
 856         if ((rport->port_id != -1) &&
 857             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 858                                         FC_WELLKNOWN_PORTID_MASK) {
 859                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 860                 case FC_FPORT_PORTID:
 861                         return snprintf(buf, 30, "Fabric Port\n");
 862                 case FC_FABCTLR_PORTID:
 863                         return snprintf(buf, 30, "Fabric Controller\n");
 864                 case FC_DIRSRVR_PORTID:
 865                         return snprintf(buf, 30, "Directory Server\n");
 866                 case FC_TIMESRVR_PORTID:
 867                         return snprintf(buf, 30, "Time Server\n");
 868                 case FC_MGMTSRVR_PORTID:
 869                         return snprintf(buf, 30, "Management Server\n");
 870                 default:
 871                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 872                 }
 873         } else {
 874                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 875                         return snprintf(buf, 20, "unknown\n");
 876                 return get_fc_port_roles_names(rport->roles, buf);
 877         }
 878 }
 879 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 880                 show_fc_rport_roles, NULL);
 881
 882 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 883 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 884
 885 /*
 886  * fast_io_fail_tmo attribute
 887  */
 888 static ssize_t
 889 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 890                                 struct device_attribute *attr, char *buf)
 891 {
 892         struct fc_rport *rport = transport_class_to_rport(dev);
 893
 894         if (rport->fast_io_fail_tmo == -1)
 895                 return snprintf(buf, 5, "off\n");
 896         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 897 }
 898
 899 static ssize_t
 900 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 901                                 struct device_attribute *attr, const char *buf,
 902                                 size_t count)
 903 {
 904         int val;
 905         char *cp;
 906         struct fc_rport *rport = transport_class_to_rport(dev);
 907
 908         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 909             (rport->port_state == FC_PORTSTATE_DELETED) ||
 910             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 911                 return -EBUSY;
 912         if (strncmp(buf, "off", 3) == 0)
 913                 rport->fast_io_fail_tmo = -1;
 914         else {
 915                 val = simple_strtoul(buf, &cp, 0);
 916                 if ((*cp && (*cp != '\n')) ||
 917                     (val < 0) || (val >= rport->dev_loss_tmo))
 918                         return -EINVAL;
 919                 rport->fast_io_fail_tmo = val;
 920         }
 921         return count;
 922 }
 923 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 924         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 925
 926
 927 /*
 928  * FC SCSI Target Attribute Management
 929  */
 930
 931 /*
 932  * Note: in the target show function we recognize when the remote
 933  *  port is in the heirarchy and do not allow the driver to get
 934  *  involved in sysfs functions. The driver only gets involved if
 935  *  it's the "old" style that doesn't use rports.
 936  */
 937 #define fc_starget_show_function(field, format_string, sz, cast)        \
 938 static ssize_t                                                          \
 939 show_fc_starget_##field (struct device *dev,                            \
 940                          struct device_attribute *attr, char *buf)      \
 941 {                                                                       \
 942         struct scsi_target *starget = transport_class_to_starget(dev);  \
 943         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 944         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 945         struct fc_rport *rport = starget_to_rport(starget);             \
 946         if (rport)                                                      \
 947                 fc_starget_##field(starget) = rport->field;             \
 948         else if (i->f->get_starget_##field)                             \
 949                 i->f->get_starget_##field(starget);                     \
 950         return snprintf(buf, sz, format_string,                         \
 951                 cast fc_starget_##field(starget));                      \
 952 }
 953
 954 #define fc_starget_rd_attr(field, format_string, sz)                    \
 955         fc_starget_show_function(field, format_string, sz, )            \
 956 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 957                          show_fc_starget_##field, NULL)
 958
 959 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 960         fc_starget_show_function(field, format_string, sz, (cast))      \
 961 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 962                           show_fc_starget_##field, NULL)
 963
 964 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 965         i->private_starget_attrs[count] = device_attr_starget_##field; \
 966         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 967         i->private_starget_attrs[count].store = NULL;                   \
 968         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 969         if (i->f->show_starget_##field)                                 \
 970                 count++
 971
 972 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 973         i->private_starget_attrs[count] = device_attr_starget_##field; \
 974         if (!i->f->set_starget_##field) {                               \
 975                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 976                 i->private_starget_attrs[count].store = NULL;           \
 977         }                                                               \
 978         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 979         if (i->f->show_starget_##field)                                 \
 980                 count++
 981
 982 /* The FC Transport SCSI Target Attributes: */
 983 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 984 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 985 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 986
 987
 988 /*
 989  * FC Virtual Port Attribute Management
 990  */
 991
 992 #define fc_vport_show_function(field, format_string, sz, cast)          \
 993 static ssize_t                                                          \
 994 show_fc_vport_##field (struct device *dev,                              \
 995                        struct device_attribute *attr, char *buf)        \
 996 {                                                                       \
 997         struct fc_vport *vport = transport_class_to_vport(dev);         \
 998         struct Scsi_Host *shost = vport_to_shost(vport);                \
 999         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1000         if ((i->f->get_vport_##field) &&                                \
1001             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1002                 i->f->get_vport_##field(vport);                         \
1003         return snprintf(buf, sz, format_string, cast vport->field);     \
1004 }
1005
1006 #define fc_vport_store_function(field)                                  \
1007 static ssize_t                                                          \
1008 store_fc_vport_##field(struct device *dev,                              \
1009                        struct device_attribute *attr,                   \
1010                        const char *buf, size_t count)                   \
1011 {                                                                       \
1012         int val;                                                        \
1013         struct fc_vport *vport = transport_class_to_vport(dev);         \
1014         struct Scsi_Host *shost = vport_to_shost(vport);                \
1015         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1016         char *cp;                                                       \
1017         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1018                 return -EBUSY;                                          \
1019         val = simple_strtoul(buf, &cp, 0);                              \
1020         if (*cp && (*cp != '\n'))                                       \
1021                 return -EINVAL;                                         \
1022         i->f->set_vport_##field(vport, val);                            \
1023         return count;                                                   \
1024 }
1025
1026 #define fc_vport_store_str_function(field, slen)                        \
1027 static ssize_t                                                          \
1028 store_fc_vport_##field(struct device *dev,                              \
1029                        struct device_attribute *attr,                   \
1030                        const char *buf, size_t count)                   \
1031 {                                                                       \
1032         struct fc_vport *vport = transport_class_to_vport(dev);         \
1033         struct Scsi_Host *shost = vport_to_shost(vport);                \
1034         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1035         unsigned int cnt=count;                                         \
1036                                                                         \
1037         /* count may include a LF at end of string */                   \
1038         if (buf[cnt-1] == '\n')                                         \
1039                 cnt--;                                                  \
1040         if (cnt > ((slen) - 1))                                         \
1041                 return -EINVAL;                                         \
1042         memcpy(vport->field, buf, cnt);                                 \
1043         i->f->set_vport_##field(vport);                                 \
1044         return count;                                                   \
1045 }
1046
1047 #define fc_vport_rd_attr(field, format_string, sz)                      \
1048         fc_vport_show_function(field, format_string, sz, )              \
1049 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1050                          show_fc_vport_##field, NULL)
1051
1052 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1053         fc_vport_show_function(field, format_string, sz, (cast))        \
1054 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1055                           show_fc_vport_##field, NULL)
1056
1057 #define fc_vport_rw_attr(field, format_string, sz)                      \
1058         fc_vport_show_function(field, format_string, sz, )              \
1059         fc_vport_store_function(field)                                  \
1060 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1061                         show_fc_vport_##field,                          \
1062                         store_fc_vport_##field)
1063
1064 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1065 static ssize_t                                                          \
1066 show_fc_vport_##field (struct device *dev,                              \
1067                        struct device_attribute *attr, char *buf)        \
1068 {                                                                       \
1069         struct fc_vport *vport = transport_class_to_vport(dev);         \
1070         return snprintf(buf, sz, format_string, cast vport->field);     \
1071 }
1072
1073 #define fc_private_vport_store_u32_function(field)                      \
1074 static ssize_t                                                          \
1075 store_fc_vport_##field(struct device *dev,                              \
1076                        struct device_attribute *attr,                   \
1077                        const char *buf, size_t count)                   \
1078 {                                                                       \
1079         u32 val;                                                        \
1080         struct fc_vport *vport = transport_class_to_vport(dev);         \
1081         char *cp;                                                       \
1082         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1083                 return -EBUSY;                                          \
1084         val = simple_strtoul(buf, &cp, 0);                              \
1085         if (*cp && (*cp != '\n'))                                       \
1086                 return -EINVAL;                                         \
1087         vport->field = val;                                             \
1088         return count;                                                   \
1089 }
1090
1091
1092 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1093         fc_private_vport_show_function(field, format_string, sz, )      \
1094 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1095                          show_fc_vport_##field, NULL)
1096
1097 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1098         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1099 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1100                           show_fc_vport_##field, NULL)
1101
1102 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1103         fc_private_vport_show_function(field, format_string, sz, )      \
1104         fc_private_vport_store_u32_function(field)                      \
1105 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1106                         show_fc_vport_##field,                          \
1107                         store_fc_vport_##field)
1108
1109
1110 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1111 static ssize_t                                                          \
1112 show_fc_vport_##title (struct device *dev,                              \
1113                        struct device_attribute *attr,                   \
1114                        char *buf)                                       \
1115 {                                                                       \
1116         struct fc_vport *vport = transport_class_to_vport(dev);         \
1117         const char *name;                                               \
1118         name = get_fc_##title##_name(vport->title);                     \
1119         if (!name)                                                      \
1120                 return -EINVAL;                                         \
1121         return snprintf(buf, maxlen, "%s\n", name);                     \
1122 }                                                                       \
1123 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1124                         show_fc_vport_##title, NULL)
1125
1126
1127 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1128         i->private_vport_attrs[count] = device_attr_vport_##field; \
1129         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1130         i->private_vport_attrs[count].store = NULL;                     \
1131         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1132         if (i->f->get_##field)                                          \
1133                 count++
1134         /* NOTE: Above MACRO differs: checks function not show bit */
1135
1136 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1137         i->private_vport_attrs[count] = device_attr_vport_##field; \
1138         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1139         i->private_vport_attrs[count].store = NULL;                     \
1140         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1141         count++
1142
1143 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1144         i->private_vport_attrs[count] = device_attr_vport_##field; \
1145         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1146         if (i->f->field)                                                \
1147                 count++
1148         /* NOTE: Above MACRO differs: checks function */
1149
1150 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1151         i->private_vport_attrs[count] = device_attr_vport_##field; \
1152         if (!i->f->set_vport_##field) {                                 \
1153                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1154                 i->private_vport_attrs[count].store = NULL;             \
1155         }                                                               \
1156         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1157         count++
1158         /* NOTE: Above MACRO differs: does not check show bit */
1159
1160 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1161 {                                                                       \
1162         i->private_vport_attrs[count] = device_attr_vport_##field; \
1163         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1164         count++;                                                        \
1165 }
1166
1167
1168 /* The FC Transport Virtual Port Attributes: */
1169
1170 /* Fixed Virtual Port Attributes */
1171
1172 /* Dynamic Virtual Port Attributes */
1173
1174 /* Private Virtual Port Attributes */
1175
1176 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1177 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1178 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1179 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1180
1181 static ssize_t
1182 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1183                      char *buf)
1184 {
1185         struct fc_vport *vport = transport_class_to_vport(dev);
1186
1187         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1188                 return snprintf(buf, 20, "unknown\n");
1189         return get_fc_port_roles_names(vport->roles, buf);
1190 }
1191 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1192
1193 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1194
1195 fc_private_vport_show_function(symbolic_name, "%s\n",
1196                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1197 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1198 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1199                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1200
1201 static ssize_t
1202 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1203                       const char *buf, size_t count)
1204 {
1205         struct fc_vport *vport = transport_class_to_vport(dev);
1206         struct Scsi_Host *shost = vport_to_shost(vport);
1207
1208         fc_queue_work(shost, &vport->vport_delete_work);
1209         return count;
1210 }
1211 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1212                         NULL, store_fc_vport_delete);
1213
1214
1215 /*
1216  * Enable/Disable vport
1217  *  Write "1" to disable, write "0" to enable
1218  */
1219 static ssize_t
1220 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1221                        const char *buf,
1222                            size_t count)
1223 {
1224         struct fc_vport *vport = transport_class_to_vport(dev);
1225         struct Scsi_Host *shost = vport_to_shost(vport);
1226         struct fc_internal *i = to_fc_internal(shost->transportt);
1227         int stat;
1228
1229         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1230                 return -EBUSY;
1231
1232         if (*buf == '0') {
1233                 if (vport->vport_state != FC_VPORT_DISABLED)
1234                         return -EALREADY;
1235         } else if (*buf == '1') {
1236                 if (vport->vport_state == FC_VPORT_DISABLED)
1237                         return -EALREADY;
1238         } else
1239                 return -EINVAL;
1240
1241         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1242         return stat ? stat : count;
1243 }
1244 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1245                         NULL, store_fc_vport_disable);
1246
1247
1248 /*
1249  * Host Attribute Management
1250  */
1251
1252 #define fc_host_show_function(field, format_string, sz, cast)           \
1253 static ssize_t                                                          \
1254 show_fc_host_##field (struct device *dev,                               \
1255                       struct device_attribute *attr, char *buf)         \
1256 {                                                                       \
1257         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1258         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1259         if (i->f->get_host_##field)                                     \
1260                 i->f->get_host_##field(shost);                          \
1261         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1262 }
1263
1264 #define fc_host_store_function(field)                                   \
1265 static ssize_t                                                          \
1266 store_fc_host_##field(struct device *dev,                               \
1267                       struct device_attribute *attr,                    \
1268                       const char *buf,  size_t count)                   \
1269 {                                                                       \
1270         int val;                                                        \
1271         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1272         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1273         char *cp;                                                       \
1274                                                                         \
1275         val = simple_strtoul(buf, &cp, 0);                              \
1276         if (*cp && (*cp != '\n'))                                       \
1277                 return -EINVAL;                                         \
1278         i->f->set_host_##field(shost, val);                             \
1279         return count;                                                   \
1280 }
1281
1282 #define fc_host_store_str_function(field, slen)                         \
1283 static ssize_t                                                          \
1284 store_fc_host_##field(struct device *dev,                               \
1285                       struct device_attribute *attr,                    \
1286                       const char *buf, size_t count)                    \
1287 {                                                                       \
1288         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1289         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1290         unsigned int cnt=count;                                         \
1291                                                                         \
1292         /* count may include a LF at end of string */                   \
1293         if (buf[cnt-1] == '\n')                                         \
1294                 cnt--;                                                  \
1295         if (cnt > ((slen) - 1))                                         \
1296                 return -EINVAL;                                         \
1297         memcpy(fc_host_##field(shost), buf, cnt);                       \
1298         i->f->set_host_##field(shost);                                  \
1299         return count;                                                   \
1300 }
1301
1302 #define fc_host_rd_attr(field, format_string, sz)                       \
1303         fc_host_show_function(field, format_string, sz, )               \
1304 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1305                          show_fc_host_##field, NULL)
1306
1307 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1308         fc_host_show_function(field, format_string, sz, (cast))         \
1309 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1310                           show_fc_host_##field, NULL)
1311
1312 #define fc_host_rw_attr(field, format_string, sz)                       \
1313         fc_host_show_function(field, format_string, sz, )               \
1314         fc_host_store_function(field)                                   \
1315 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1316                         show_fc_host_##field,                           \
1317                         store_fc_host_##field)
1318
1319 #define fc_host_rd_enum_attr(title, maxlen)                             \
1320 static ssize_t                                                          \
1321 show_fc_host_##title (struct device *dev,                               \
1322                       struct device_attribute *attr, char *buf)         \
1323 {                                                                       \
1324         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1325         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1326         const char *name;                                               \
1327         if (i->f->get_host_##title)                                     \
1328                 i->f->get_host_##title(shost);                          \
1329         name = get_fc_##title##_name(fc_host_##title(shost));           \
1330         if (!name)                                                      \
1331                 return -EINVAL;                                         \
1332         return snprintf(buf, maxlen, "%s\n", name);                     \
1333 }                                                                       \
1334 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1335
1336 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1337         i->private_host_attrs[count] = device_attr_host_##field;        \
1338         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1339         i->private_host_attrs[count].store = NULL;                      \
1340         i->host_attrs[count] = &i->private_host_attrs[count];           \
1341         if (i->f->show_host_##field)                                    \
1342                 count++
1343
1344 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1345         i->private_host_attrs[count] = device_attr_host_##field;        \
1346         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1347         i->private_host_attrs[count].store = NULL;                      \
1348         i->host_attrs[count] = &i->private_host_attrs[count];           \
1349         count++
1350
1351 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1352         i->private_host_attrs[count] = device_attr_host_##field;        \
1353         if (!i->f->set_host_##field) {                                  \
1354                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1355                 i->private_host_attrs[count].store = NULL;              \
1356         }                                                               \
1357         i->host_attrs[count] = &i->private_host_attrs[count];           \
1358         if (i->f->show_host_##field)                                    \
1359                 count++
1360
1361
1362 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1363 static ssize_t                                                          \
1364 show_fc_host_##field (struct device *dev,                               \
1365                       struct device_attribute *attr, char *buf)         \
1366 {                                                                       \
1367         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1368         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1369 }
1370
1371 #define fc_private_host_rd_attr(field, format_string, sz)               \
1372         fc_private_host_show_function(field, format_string, sz, )       \
1373 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1374                          show_fc_host_##field, NULL)
1375
1376 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1377         fc_private_host_show_function(field, format_string, sz, (cast)) \
1378 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1379                           show_fc_host_##field, NULL)
1380
1381 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1382         i->private_host_attrs[count] = device_attr_host_##field;        \
1383         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1384         i->private_host_attrs[count].store = NULL;                      \
1385         i->host_attrs[count] = &i->private_host_attrs[count];           \
1386         count++
1387
1388 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1389 {                                                                       \
1390         i->private_host_attrs[count] = device_attr_host_##field;        \
1391         i->host_attrs[count] = &i->private_host_attrs[count];           \
1392         count++;                                                        \
1393 }
1394
1395
1396 /* Fixed Host Attributes */
1397
1398 static ssize_t
1399 show_fc_host_supported_classes (struct device *dev,
1400                                 struct device_attribute *attr, char *buf)
1401 {
1402         struct Scsi_Host *shost = transport_class_to_shost(dev);
1403
1404         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1405                 return snprintf(buf, 20, "unspecified\n");
1406
1407         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1408 }
1409 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1410                 show_fc_host_supported_classes, NULL);
1411
1412 static ssize_t
1413 show_fc_host_supported_fc4s (struct device *dev,
1414                              struct device_attribute *attr, char *buf)
1415 {
1416         struct Scsi_Host *shost = transport_class_to_shost(dev);
1417         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1418 }
1419 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1420                 show_fc_host_supported_fc4s, NULL);
1421
1422 static ssize_t
1423 show_fc_host_supported_speeds (struct device *dev,
1424                                struct device_attribute *attr, char *buf)
1425 {
1426         struct Scsi_Host *shost = transport_class_to_shost(dev);
1427
1428         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1429                 return snprintf(buf, 20, "unknown\n");
1430
1431         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1432 }
1433 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1434                 show_fc_host_supported_speeds, NULL);
1435
1436
1437 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1438 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1439 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1440                              unsigned long long);
1441 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1442 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1443 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1444
1445
1446 /* Dynamic Host Attributes */
1447
1448 static ssize_t
1449 show_fc_host_active_fc4s (struct device *dev,
1450                           struct device_attribute *attr, char *buf)
1451 {
1452         struct Scsi_Host *shost = transport_class_to_shost(dev);
1453         struct fc_internal *i = to_fc_internal(shost->transportt);
1454
1455         if (i->f->get_host_active_fc4s)
1456                 i->f->get_host_active_fc4s(shost);
1457
1458         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1459 }
1460 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1461                 show_fc_host_active_fc4s, NULL);
1462
1463 static ssize_t
1464 show_fc_host_speed (struct device *dev,
1465                     struct device_attribute *attr, char *buf)
1466 {
1467         struct Scsi_Host *shost = transport_class_to_shost(dev);
1468         struct fc_internal *i = to_fc_internal(shost->transportt);
1469
1470         if (i->f->get_host_speed)
1471                 i->f->get_host_speed(shost);
1472
1473         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1474                 return snprintf(buf, 20, "unknown\n");
1475
1476         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1477 }
1478 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1479                 show_fc_host_speed, NULL);
1480
1481
1482 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1483 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1484 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1485 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1486 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1487
1488 fc_private_host_show_function(system_hostname, "%s\n",
1489                 FC_SYMBOLIC_NAME_SIZE + 1, )
1490 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1491 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1492                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1493
1494
1495 /* Private Host Attributes */
1496
1497 static ssize_t
1498 show_fc_private_host_tgtid_bind_type(struct device *dev,
1499                                      struct device_attribute *attr, char *buf)
1500 {
1501         struct Scsi_Host *shost = transport_class_to_shost(dev);
1502         const char *name;
1503
1504         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1505         if (!name)
1506                 return -EINVAL;
1507         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1508 }
1509
1510 #define get_list_head_entry(pos, head, member)          \
1511         pos = list_entry((head)->next, typeof(*pos), member)
1512
1513 static ssize_t
1514 store_fc_private_host_tgtid_bind_type(struct device *dev,
1515         struct device_attribute *attr, const char *buf, size_t count)
1516 {
1517         struct Scsi_Host *shost = transport_class_to_shost(dev);
1518         struct fc_rport *rport;
1519         enum fc_tgtid_binding_type val;
1520         unsigned long flags;
1521
1522         if (get_fc_tgtid_bind_type_match(buf, &val))
1523                 return -EINVAL;
1524
1525         /* if changing bind type, purge all unused consistent bindings */
1526         if (val != fc_host_tgtid_bind_type(shost)) {
1527                 spin_lock_irqsave(shost->host_lock, flags);
1528                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1529                         get_list_head_entry(rport,
1530                                 &fc_host_rport_bindings(shost), peers);
1531                         list_del(&rport->peers);
1532                         rport->port_state = FC_PORTSTATE_DELETED;
1533                         fc_queue_work(shost, &rport->rport_delete_work);
1534                 }
1535                 spin_unlock_irqrestore(shost->host_lock, flags);
1536         }
1537
1538         fc_host_tgtid_bind_type(shost) = val;
1539         return count;
1540 }
1541
1542 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1543                         show_fc_private_host_tgtid_bind_type,
1544                         store_fc_private_host_tgtid_bind_type);
1545
1546 static ssize_t
1547 store_fc_private_host_issue_lip(struct device *dev,
1548         struct device_attribute *attr, const char *buf, size_t count)
1549 {
1550         struct Scsi_Host *shost = transport_class_to_shost(dev);
1551         struct fc_internal *i = to_fc_internal(shost->transportt);
1552         int ret;
1553
1554         /* ignore any data value written to the attribute */
1555         if (i->f->issue_fc_host_lip) {
1556                 ret = i->f->issue_fc_host_lip(shost);
1557                 return ret ? ret: count;
1558         }
1559
1560         return -ENOENT;
1561 }
1562
1563 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1564                         store_fc_private_host_issue_lip);
1565
1566 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1567
1568
1569 /*
1570  * Host Statistics Management
1571  */
1572
1573 /* Show a given an attribute in the statistics group */
1574 static ssize_t
1575 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1576 {
1577         struct Scsi_Host *shost = transport_class_to_shost(dev);
1578         struct fc_internal *i = to_fc_internal(shost->transportt);
1579         struct fc_host_statistics *stats;
1580         ssize_t ret = -ENOENT;
1581
1582         if (offset > sizeof(struct fc_host_statistics) ||
1583             offset % sizeof(u64) != 0)
1584                 WARN_ON(1);
1585
1586         if (i->f->get_fc_host_stats) {
1587                 stats = (i->f->get_fc_host_stats)(shost);
1588                 if (stats)
1589                         ret = snprintf(buf, 20, "0x%llx\n",
1590                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1591         }
1592         return ret;
1593 }
1594
1595
1596 /* generate a read-only statistics attribute */
1597 #define fc_host_statistic(name)                                         \
1598 static ssize_t show_fcstat_##name(struct device *cd,                    \
1599                                   struct device_attribute *attr,        \
1600                                   char *buf)                            \
1601 {                                                                       \
1602         return fc_stat_show(cd, buf,                                    \
1603                             offsetof(struct fc_host_statistics, name)); \
1604 }                                                                       \
1605 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1606
1607 fc_host_statistic(seconds_since_last_reset);
1608 fc_host_statistic(tx_frames);
1609 fc_host_statistic(tx_words);
1610 fc_host_statistic(rx_frames);
1611 fc_host_statistic(rx_words);
1612 fc_host_statistic(lip_count);
1613 fc_host_statistic(nos_count);
1614 fc_host_statistic(error_frames);
1615 fc_host_statistic(dumped_frames);
1616 fc_host_statistic(link_failure_count);
1617 fc_host_statistic(loss_of_sync_count);
1618 fc_host_statistic(loss_of_signal_count);
1619 fc_host_statistic(prim_seq_protocol_err_count);
1620 fc_host_statistic(invalid_tx_word_count);
1621 fc_host_statistic(invalid_crc_count);
1622 fc_host_statistic(fcp_input_requests);
1623 fc_host_statistic(fcp_output_requests);
1624 fc_host_statistic(fcp_control_requests);
1625 fc_host_statistic(fcp_input_megabytes);
1626 fc_host_statistic(fcp_output_megabytes);
1627
1628 static ssize_t
1629 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1630                     const char *buf, size_t count)
1631 {
1632         struct Scsi_Host *shost = transport_class_to_shost(dev);
1633         struct fc_internal *i = to_fc_internal(shost->transportt);
1634
1635         /* ignore any data value written to the attribute */
1636         if (i->f->reset_fc_host_stats) {
1637                 i->f->reset_fc_host_stats(shost);
1638                 return count;
1639         }
1640
1641         return -ENOENT;
1642 }
1643 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1644                                 fc_reset_statistics);
1645
1646 static struct attribute *fc_statistics_attrs[] = {
1647         &device_attr_host_seconds_since_last_reset.attr,
1648         &device_attr_host_tx_frames.attr,
1649         &device_attr_host_tx_words.attr,
1650         &device_attr_host_rx_frames.attr,
1651         &device_attr_host_rx_words.attr,
1652         &device_attr_host_lip_count.attr,
1653         &device_attr_host_nos_count.attr,
1654         &device_attr_host_error_frames.attr,
1655         &device_attr_host_dumped_frames.attr,
1656         &device_attr_host_link_failure_count.attr,
1657         &device_attr_host_loss_of_sync_count.attr,
1658         &device_attr_host_loss_of_signal_count.attr,
1659         &device_attr_host_prim_seq_protocol_err_count.attr,
1660         &device_attr_host_invalid_tx_word_count.attr,
1661         &device_attr_host_invalid_crc_count.attr,
1662         &device_attr_host_fcp_input_requests.attr,
1663         &device_attr_host_fcp_output_requests.attr,
1664         &device_attr_host_fcp_control_requests.attr,
1665         &device_attr_host_fcp_input_megabytes.attr,
1666         &device_attr_host_fcp_output_megabytes.attr,
1667         &device_attr_host_reset_statistics.attr,
1668         NULL
1669 };
1670
1671 static struct attribute_group fc_statistics_group = {
1672         .name = "statistics",
1673         .attrs = fc_statistics_attrs,
1674 };
1675
1676
1677 /* Host Vport Attributes */
1678
1679 static int
1680 fc_parse_wwn(const char *ns, u64 *nm)
1681 {
1682         unsigned int i, j;
1683         u8 wwn[8];
1684
1685         memset(wwn, 0, sizeof(wwn));
1686
1687         /* Validate and store the new name */
1688         for (i=0, j=0; i < 16; i++) {
1689                 if ((*ns >= 'a') && (*ns <= 'f'))
1690                         j = ((j << 4) | ((*ns++ -'a') + 10));
1691                 else if ((*ns >= 'A') && (*ns <= 'F'))
1692                         j = ((j << 4) | ((*ns++ -'A') + 10));
1693                 else if ((*ns >= '0') && (*ns <= '9'))
1694                         j = ((j << 4) | (*ns++ -'0'));
1695                 else
1696                         return -EINVAL;
1697                 if (i % 2) {
1698                         wwn[i/2] = j & 0xff;
1699                         j = 0;
1700                 }
1701         }
1702
1703         *nm = wwn_to_u64(wwn);
1704
1705         return 0;
1706 }
1707
1708
1709 /*
1710  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1711  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1712  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1713  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1714  */
1715 static ssize_t
1716 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1717                            const char *buf, size_t count)
1718 {
1719         struct Scsi_Host *shost = transport_class_to_shost(dev);
1720         struct fc_vport_identifiers vid;
1721         struct fc_vport *vport;
1722         unsigned int cnt=count;
1723         int stat;
1724
1725         memset(&vid, 0, sizeof(vid));
1726
1727         /* count may include a LF at end of string */
1728         if (buf[cnt-1] == '\n')
1729                 cnt--;
1730
1731         /* validate we have enough characters for WWPN */
1732         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1733                 return -EINVAL;
1734
1735         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1736         if (stat)
1737                 return stat;
1738
1739         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1740         if (stat)
1741                 return stat;
1742
1743         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1744         vid.vport_type = FC_PORTTYPE_NPIV;
1745         /* vid.symbolic_name is already zero/NULL's */
1746         vid.disable = false;            /* always enabled */
1747
1748         /* we only allow support on Channel 0 !!! */
1749         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1750         return stat ? stat : count;
1751 }
1752 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1753                         store_fc_host_vport_create);
1754
1755
1756 /*
1757  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1758  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1759  * The WWNs are specified as hex characters, and may *not* contain
1760  * any prefixes (e.g. 0x, x, etc)
1761  */
1762 static ssize_t
1763 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1764                            const char *buf, size_t count)
1765 {
1766         struct Scsi_Host *shost = transport_class_to_shost(dev);
1767         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1768         struct fc_vport *vport;
1769         u64 wwpn, wwnn;
1770         unsigned long flags;
1771         unsigned int cnt=count;
1772         int stat, match;
1773
1774         /* count may include a LF at end of string */
1775         if (buf[cnt-1] == '\n')
1776                 cnt--;
1777
1778         /* validate we have enough characters for WWPN */
1779         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1780                 return -EINVAL;
1781
1782         stat = fc_parse_wwn(&buf[0], &wwpn);
1783         if (stat)
1784                 return stat;
1785
1786         stat = fc_parse_wwn(&buf[17], &wwnn);
1787         if (stat)
1788                 return stat;
1789
1790         spin_lock_irqsave(shost->host_lock, flags);
1791         match = 0;
1792         /* we only allow support on Channel 0 !!! */
1793         list_for_each_entry(vport, &fc_host->vports, peers) {
1794                 if ((vport->channel == 0) &&
1795                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1796                         match = 1;
1797                         break;
1798                 }
1799         }
1800         spin_unlock_irqrestore(shost->host_lock, flags);
1801
1802         if (!match)
1803                 return -ENODEV;
1804
1805         stat = fc_vport_terminate(vport);
1806         return stat ? stat : count;
1807 }
1808 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1809                         store_fc_host_vport_delete);
1810
1811
1812 static int fc_host_match(struct attribute_container *cont,
1813                           struct device *dev)
1814 {
1815         struct Scsi_Host *shost;
1816         struct fc_internal *i;
1817
1818         if (!scsi_is_host_device(dev))
1819                 return 0;
1820
1821         shost = dev_to_shost(dev);
1822         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1823             != &fc_host_class.class)
1824                 return 0;
1825
1826         i = to_fc_internal(shost->transportt);
1827
1828         return &i->t.host_attrs.ac == cont;
1829 }
1830
1831 static int fc_target_match(struct attribute_container *cont,
1832                             struct device *dev)
1833 {
1834         struct Scsi_Host *shost;
1835         struct fc_internal *i;
1836
1837         if (!scsi_is_target_device(dev))
1838                 return 0;
1839
1840         shost = dev_to_shost(dev->parent);
1841         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1842             != &fc_host_class.class)
1843                 return 0;
1844
1845         i = to_fc_internal(shost->transportt);
1846
1847         return &i->t.target_attrs.ac == cont;
1848 }
1849
1850 static void fc_rport_dev_release(struct device *dev)
1851 {
1852         struct fc_rport *rport = dev_to_rport(dev);
1853         put_device(dev->parent);
1854         kfree(rport);
1855 }
1856
1857 int scsi_is_fc_rport(const struct device *dev)
1858 {
1859         return dev->release == fc_rport_dev_release;
1860 }
1861 EXPORT_SYMBOL(scsi_is_fc_rport);
1862
1863 static int fc_rport_match(struct attribute_container *cont,
1864                             struct device *dev)
1865 {
1866         struct Scsi_Host *shost;
1867         struct fc_internal *i;
1868
1869         if (!scsi_is_fc_rport(dev))
1870                 return 0;
1871
1872         shost = dev_to_shost(dev->parent);
1873         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1874             != &fc_host_class.class)
1875                 return 0;
1876
1877         i = to_fc_internal(shost->transportt);
1878
1879         return &i->rport_attr_cont.ac == cont;
1880 }
1881
1882
1883 static void fc_vport_dev_release(struct device *dev)
1884 {
1885         struct fc_vport *vport = dev_to_vport(dev);
1886         put_device(dev->parent);                /* release kobj parent */
1887         kfree(vport);
1888 }
1889
1890 int scsi_is_fc_vport(const struct device *dev)
1891 {
1892         return dev->release == fc_vport_dev_release;
1893 }
1894 EXPORT_SYMBOL(scsi_is_fc_vport);
1895
1896 static int fc_vport_match(struct attribute_container *cont,
1897                             struct device *dev)
1898 {
1899         struct fc_vport *vport;
1900         struct Scsi_Host *shost;
1901         struct fc_internal *i;
1902
1903         if (!scsi_is_fc_vport(dev))
1904                 return 0;
1905         vport = dev_to_vport(dev);
1906
1907         shost = vport_to_shost(vport);
1908         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1909             != &fc_host_class.class)
1910                 return 0;
1911
1912         i = to_fc_internal(shost->transportt);
1913         return &i->vport_attr_cont.ac == cont;
1914 }
1915
1916
1917 /**
1918  * fc_timed_out - FC Transport I/O timeout intercept handler
1919  * @scmd:       The SCSI command which timed out
1920  *
1921  * This routine protects against error handlers getting invoked while a
1922  * rport is in a blocked state, typically due to a temporarily loss of
1923  * connectivity. If the error handlers are allowed to proceed, requests
1924  * to abort i/o, reset the target, etc will likely fail as there is no way
1925  * to communicate with the device to perform the requested function. These
1926  * failures may result in the midlayer taking the device offline, requiring
1927  * manual intervention to restore operation.
1928  *
1929  * This routine, called whenever an i/o times out, validates the state of
1930  * the underlying rport. If the rport is blocked, it returns
1931  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1932  * Eventually, either the device will return, or devloss_tmo will fire,
1933  * and when the timeout then fires, it will be handled normally.
1934  * If the rport is not blocked, normal error handling continues.
1935  *
1936  * Notes:
1937  *      This routine assumes no locks are held on entry.
1938  */
1939 static enum blk_eh_timer_return
1940 fc_timed_out(struct scsi_cmnd *scmd)
1941 {
1942         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1943
1944         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1945                 return BLK_EH_RESET_TIMER;
1946
1947         return BLK_EH_NOT_HANDLED;
1948 }
1949
1950 /*
1951  * Called by fc_user_scan to locate an rport on the shost that
1952  * matches the channel and target id, and invoke scsi_scan_target()
1953  * on the rport.
1954  */
1955 static void
1956 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1957 {
1958         struct fc_rport *rport;
1959         unsigned long flags;
1960
1961         spin_lock_irqsave(shost->host_lock, flags);
1962
1963         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1964                 if (rport->scsi_target_id == -1)
1965                         continue;
1966
1967                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1968                         continue;
1969
1970                 if ((channel == rport->channel) &&
1971                     (id == rport->scsi_target_id)) {
1972                         spin_unlock_irqrestore(shost->host_lock, flags);
1973                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
1974                         return;
1975                 }
1976         }
1977
1978         spin_unlock_irqrestore(shost->host_lock, flags);
1979 }
1980
1981 /*
1982  * Called via sysfs scan routines. Necessary, as the FC transport
1983  * wants to place all target objects below the rport object. So this
1984  * routine must invoke the scsi_scan_target() routine with the rport
1985  * object as the parent.
1986  */
1987 static int
1988 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1989 {
1990         uint chlo, chhi;
1991         uint tgtlo, tgthi;
1992
1993         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1994             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1995             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1996                 return -EINVAL;
1997
1998         if (channel == SCAN_WILD_CARD) {
1999                 chlo = 0;
2000                 chhi = shost->max_channel + 1;
2001         } else {
2002                 chlo = channel;
2003                 chhi = channel + 1;
2004         }
2005
2006         if (id == SCAN_WILD_CARD) {
2007                 tgtlo = 0;
2008                 tgthi = shost->max_id;
2009         } else {
2010                 tgtlo = id;
2011                 tgthi = id + 1;
2012         }
2013
2014         for ( ; chlo < chhi; chlo++)
2015                 for ( ; tgtlo < tgthi; tgtlo++)
2016                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2017
2018         return 0;
2019 }
2020
2021 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2022                                 int result)
2023 {
2024         struct fc_internal *i = to_fc_internal(shost->transportt);
2025         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2026 }
2027
2028 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2029 {
2030         struct fc_internal *i = to_fc_internal(shost->transportt);
2031         return i->f->it_nexus_response(shost, nexus, result);
2032 }
2033
2034 struct scsi_transport_template *
2035 fc_attach_transport(struct fc_function_template *ft)
2036 {
2037         int count;
2038         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2039                                         GFP_KERNEL);
2040
2041         if (unlikely(!i))
2042                 return NULL;
2043
2044         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2045         i->t.target_attrs.ac.class = &fc_transport_class.class;
2046         i->t.target_attrs.ac.match = fc_target_match;
2047         i->t.target_size = sizeof(struct fc_starget_attrs);
2048         transport_container_register(&i->t.target_attrs);
2049
2050         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2051         i->t.host_attrs.ac.class = &fc_host_class.class;
2052         i->t.host_attrs.ac.match = fc_host_match;
2053         i->t.host_size = sizeof(struct fc_host_attrs);
2054         if (ft->get_fc_host_stats)
2055                 i->t.host_attrs.statistics = &fc_statistics_group;
2056         transport_container_register(&i->t.host_attrs);
2057
2058         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2059         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2060         i->rport_attr_cont.ac.match = fc_rport_match;
2061         transport_container_register(&i->rport_attr_cont);
2062
2063         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2064         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2065         i->vport_attr_cont.ac.match = fc_vport_match;
2066         transport_container_register(&i->vport_attr_cont);
2067
2068         i->f = ft;
2069
2070         /* Transport uses the shost workq for scsi scanning */
2071         i->t.create_work_queue = 1;
2072
2073         i->t.eh_timed_out = fc_timed_out;
2074
2075         i->t.user_scan = fc_user_scan;
2076
2077         /* target-mode drivers' functions */
2078         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2079         i->t.it_nexus_response = fc_it_nexus_response;
2080
2081         /*
2082          * Setup SCSI Target Attributes.
2083          */
2084         count = 0;
2085         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2086         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2087         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2088
2089         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2090
2091         i->starget_attrs[count] = NULL;
2092
2093
2094         /*
2095          * Setup SCSI Host Attributes.
2096          */
2097         count=0;
2098         SETUP_HOST_ATTRIBUTE_RD(node_name);
2099         SETUP_HOST_ATTRIBUTE_RD(port_name);
2100         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2101         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2102         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2103         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2104         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2105         if (ft->vport_create) {
2106                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2107                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2108         }
2109         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2110
2111         SETUP_HOST_ATTRIBUTE_RD(port_id);
2112         SETUP_HOST_ATTRIBUTE_RD(port_type);
2113         SETUP_HOST_ATTRIBUTE_RD(port_state);
2114         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2115         SETUP_HOST_ATTRIBUTE_RD(speed);
2116         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2117         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2118         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2119
2120         /* Transport-managed attributes */
2121         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2122         if (ft->issue_fc_host_lip)
2123                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2124         if (ft->vport_create)
2125                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2126         if (ft->vport_delete)
2127                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2128
2129         BUG_ON(count > FC_HOST_NUM_ATTRS);
2130
2131         i->host_attrs[count] = NULL;
2132
2133         /*
2134          * Setup Remote Port Attributes.
2135          */
2136         count=0;
2137         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2138         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2139         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2140         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2141         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2142         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2143         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2144         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2145         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2146         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2147
2148         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2149
2150         i->rport_attrs[count] = NULL;
2151
2152         /*
2153          * Setup Virtual Port Attributes.
2154          */
2155         count=0;
2156         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2157         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2158         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2159         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2160         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2161         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2162         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2163         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2164         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2165
2166         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2167
2168         i->vport_attrs[count] = NULL;
2169
2170         return &i->t;
2171 }
2172 EXPORT_SYMBOL(fc_attach_transport);
2173
2174 void fc_release_transport(struct scsi_transport_template *t)
2175 {
2176         struct fc_internal *i = to_fc_internal(t);
2177
2178         transport_container_unregister(&i->t.target_attrs);
2179         transport_container_unregister(&i->t.host_attrs);
2180         transport_container_unregister(&i->rport_attr_cont);
2181         transport_container_unregister(&i->vport_attr_cont);
2182
2183         kfree(i);
2184 }
2185 EXPORT_SYMBOL(fc_release_transport);
2186
2187 /**
2188  * fc_queue_work - Queue work to the fc_host workqueue.
2189  * @shost:      Pointer to Scsi_Host bound to fc_host.
2190  * @work:       Work to queue for execution.
2191  *
2192  * Return value:
2193  *      1 - work queued for execution
2194  *      0 - work is already queued
2195  *      -EINVAL - work queue doesn't exist
2196  */
2197 static int
2198 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2199 {
2200         if (unlikely(!fc_host_work_q(shost))) {
2201                 printk(KERN_ERR
2202                         "ERROR: FC host '%s' attempted to queue work, "
2203                         "when no workqueue created.\n", shost->hostt->name);
2204                 dump_stack();
2205
2206                 return -EINVAL;
2207         }
2208
2209         return queue_work(fc_host_work_q(shost), work);
2210 }
2211
2212 /**
2213  * fc_flush_work - Flush a fc_host's workqueue.
2214  * @shost:      Pointer to Scsi_Host bound to fc_host.
2215  */
2216 static void
2217 fc_flush_work(struct Scsi_Host *shost)
2218 {
2219         if (!fc_host_work_q(shost)) {
2220                 printk(KERN_ERR
2221                         "ERROR: FC host '%s' attempted to flush work, "
2222                         "when no workqueue created.\n", shost->hostt->name);
2223                 dump_stack();
2224                 return;
2225         }
2226
2227         flush_workqueue(fc_host_work_q(shost));
2228 }
2229
2230 /**
2231  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2232  * @shost:      Pointer to Scsi_Host bound to fc_host.
2233  * @work:       Work to queue for execution.
2234  * @delay:      jiffies to delay the work queuing
2235  *
2236  * Return value:
2237  *      1 on success / 0 already queued / < 0 for error
2238  */
2239 static int
2240 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2241                                 unsigned long delay)
2242 {
2243         if (unlikely(!fc_host_devloss_work_q(shost))) {
2244                 printk(KERN_ERR
2245                         "ERROR: FC host '%s' attempted to queue work, "
2246                         "when no workqueue created.\n", shost->hostt->name);
2247                 dump_stack();
2248
2249                 return -EINVAL;
2250         }
2251
2252         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2253 }
2254
2255 /**
2256  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2257  * @shost:      Pointer to Scsi_Host bound to fc_host.
2258  */
2259 static void
2260 fc_flush_devloss(struct Scsi_Host *shost)
2261 {
2262         if (!fc_host_devloss_work_q(shost)) {
2263                 printk(KERN_ERR
2264                         "ERROR: FC host '%s' attempted to flush work, "
2265                         "when no workqueue created.\n", shost->hostt->name);
2266                 dump_stack();
2267                 return;
2268         }
2269
2270         flush_workqueue(fc_host_devloss_work_q(shost));
2271 }
2272
2273
2274 /**
2275  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2276  * @shost:      Which &Scsi_Host
2277  *
2278  * This routine is expected to be called immediately preceeding the
2279  * a driver's call to scsi_remove_host().
2280  *
2281  * WARNING: A driver utilizing the fc_transport, which fails to call
2282  *   this routine prior to scsi_remove_host(), will leave dangling
2283  *   objects in /sys/class/fc_remote_ports. Access to any of these
2284  *   objects can result in a system crash !!!
2285  *
2286  * Notes:
2287  *      This routine assumes no locks are held on entry.
2288  */
2289 void
2290 fc_remove_host(struct Scsi_Host *shost)
2291 {
2292         struct fc_vport *vport = NULL, *next_vport = NULL;
2293         struct fc_rport *rport = NULL, *next_rport = NULL;
2294         struct workqueue_struct *work_q;
2295         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2296         unsigned long flags;
2297
2298         spin_lock_irqsave(shost->host_lock, flags);
2299
2300         /* Remove any vports */
2301         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2302                 fc_queue_work(shost, &vport->vport_delete_work);
2303
2304         /* Remove any remote ports */
2305         list_for_each_entry_safe(rport, next_rport,
2306                         &fc_host->rports, peers) {
2307                 list_del(&rport->peers);
2308                 rport->port_state = FC_PORTSTATE_DELETED;
2309                 fc_queue_work(shost, &rport->rport_delete_work);
2310         }
2311
2312         list_for_each_entry_safe(rport, next_rport,
2313                         &fc_host->rport_bindings, peers) {
2314                 list_del(&rport->peers);
2315                 rport->port_state = FC_PORTSTATE_DELETED;
2316                 fc_queue_work(shost, &rport->rport_delete_work);
2317         }
2318
2319         spin_unlock_irqrestore(shost->host_lock, flags);
2320
2321         /* flush all scan work items */
2322         scsi_flush_work(shost);
2323
2324         /* flush all stgt delete, and rport delete work items, then kill it  */
2325         if (fc_host->work_q) {
2326                 work_q = fc_host->work_q;
2327                 fc_host->work_q = NULL;
2328                 destroy_workqueue(work_q);
2329         }
2330
2331         /* flush all devloss work items, then kill it  */
2332         if (fc_host->devloss_work_q) {
2333                 work_q = fc_host->devloss_work_q;
2334                 fc_host->devloss_work_q = NULL;
2335                 destroy_workqueue(work_q);
2336         }
2337 }
2338 EXPORT_SYMBOL(fc_remove_host);
2339
2340 static void fc_terminate_rport_io(struct fc_rport *rport)
2341 {
2342         struct Scsi_Host *shost = rport_to_shost(rport);
2343         struct fc_internal *i = to_fc_internal(shost->transportt);
2344
2345         /* Involve the LLDD if possible to terminate all io on the rport. */
2346         if (i->f->terminate_rport_io)
2347                 i->f->terminate_rport_io(rport);
2348
2349         /*
2350          * must unblock to flush queued IO. The caller will have set
2351          * the port_state or flags, so that fc_remote_port_chkready will
2352          * fail IO.
2353          */
2354         scsi_target_unblock(&rport->dev);
2355 }
2356
2357 /**
2358  * fc_starget_delete - called to delete the scsi decendents of an rport
2359  * @work:       remote port to be operated on.
2360  *
2361  * Deletes target and all sdevs.
2362  */
2363 static void
2364 fc_starget_delete(struct work_struct *work)
2365 {
2366         struct fc_rport *rport =
2367                 container_of(work, struct fc_rport, stgt_delete_work);
2368
2369         fc_terminate_rport_io(rport);
2370         scsi_remove_target(&rport->dev);
2371 }
2372
2373
2374 /**
2375  * fc_rport_final_delete - finish rport termination and delete it.
2376  * @work:       remote port to be deleted.
2377  */
2378 static void
2379 fc_rport_final_delete(struct work_struct *work)
2380 {
2381         struct fc_rport *rport =
2382                 container_of(work, struct fc_rport, rport_delete_work);
2383         struct device *dev = &rport->dev;
2384         struct Scsi_Host *shost = rport_to_shost(rport);
2385         struct fc_internal *i = to_fc_internal(shost->transportt);
2386         unsigned long flags;
2387         int do_callback = 0;
2388
2389         /*
2390          * if a scan is pending, flush the SCSI Host work_q so that
2391          * that we can reclaim the rport scan work element.
2392          */
2393         if (rport->flags & FC_RPORT_SCAN_PENDING)
2394                 scsi_flush_work(shost);
2395
2396         fc_terminate_rport_io(rport);
2397
2398         /*
2399          * Cancel any outstanding timers. These should really exist
2400          * only when rmmod'ing the LLDD and we're asking for
2401          * immediate termination of the rports
2402          */
2403         spin_lock_irqsave(shost->host_lock, flags);
2404         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2405                 spin_unlock_irqrestore(shost->host_lock, flags);
2406                 if (!cancel_delayed_work(&rport->fail_io_work))
2407                         fc_flush_devloss(shost);
2408                 if (!cancel_delayed_work(&rport->dev_loss_work))
2409                         fc_flush_devloss(shost);
2410                 spin_lock_irqsave(shost->host_lock, flags);
2411                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2412         }
2413         spin_unlock_irqrestore(shost->host_lock, flags);
2414
2415         /* Delete SCSI target and sdevs */
2416         if (rport->scsi_target_id != -1)
2417                 fc_starget_delete(&rport->stgt_delete_work);
2418
2419         /*
2420          * Notify the driver that the rport is now dead. The LLDD will
2421          * also guarantee that any communication to the rport is terminated
2422          *
2423          * Avoid this call if we already called it when we preserved the
2424          * rport for the binding.
2425          */
2426         spin_lock_irqsave(shost->host_lock, flags);
2427         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2428             (i->f->dev_loss_tmo_callbk)) {
2429                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2430                 do_callback = 1;
2431         }
2432         spin_unlock_irqrestore(shost->host_lock, flags);
2433
2434         if (do_callback)
2435                 i->f->dev_loss_tmo_callbk(rport);
2436
2437         fc_bsg_remove(rport->rqst_q);
2438
2439         transport_remove_device(dev);
2440         device_del(dev);
2441         transport_destroy_device(dev);
2442         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2443         put_device(dev);                        /* for self-reference */
2444 }
2445
2446
2447 /**
2448  * fc_rport_create - allocates and creates a remote FC port.
2449  * @shost:      scsi host the remote port is connected to.
2450  * @channel:    Channel on shost port connected to.
2451  * @ids:        The world wide names, fc address, and FC4 port
2452  *              roles for the remote port.
2453  *
2454  * Allocates and creates the remoter port structure, including the
2455  * class and sysfs creation.
2456  *
2457  * Notes:
2458  *      This routine assumes no locks are held on entry.
2459  */
2460 static struct fc_rport *
2461 fc_rport_create(struct Scsi_Host *shost, int channel,
2462         struct fc_rport_identifiers  *ids)
2463 {
2464         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2465         struct fc_internal *fci = to_fc_internal(shost->transportt);
2466         struct fc_rport *rport;
2467         struct device *dev;
2468         unsigned long flags;
2469         int error;
2470         size_t size;
2471
2472         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2473         rport = kzalloc(size, GFP_KERNEL);
2474         if (unlikely(!rport)) {
2475                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2476                 return NULL;
2477         }
2478
2479         rport->maxframe_size = -1;
2480         rport->supported_classes = FC_COS_UNSPECIFIED;
2481         rport->dev_loss_tmo = fc_dev_loss_tmo;
2482         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2483         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2484         rport->port_id = ids->port_id;
2485         rport->roles = ids->roles;
2486         rport->port_state = FC_PORTSTATE_ONLINE;
2487         if (fci->f->dd_fcrport_size)
2488                 rport->dd_data = &rport[1];
2489         rport->channel = channel;
2490         rport->fast_io_fail_tmo = -1;
2491
2492         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2493         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2494         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2495         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2496         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2497
2498         spin_lock_irqsave(shost->host_lock, flags);
2499
2500         rport->number = fc_host->next_rport_number++;
2501         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2502                 rport->scsi_target_id = fc_host->next_target_id++;
2503         else
2504                 rport->scsi_target_id = -1;
2505         list_add_tail(&rport->peers, &fc_host->rports);
2506         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2507
2508         spin_unlock_irqrestore(shost->host_lock, flags);
2509
2510         dev = &rport->dev;
2511         device_initialize(dev);                 /* takes self reference */
2512         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2513         dev->release = fc_rport_dev_release;
2514         dev_set_name(dev, "rport-%d:%d-%d",
2515                      shost->host_no, channel, rport->number);
2516         transport_setup_device(dev);
2517
2518         error = device_add(dev);
2519         if (error) {
2520                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2521                 goto delete_rport;
2522         }
2523         transport_add_device(dev);
2524         transport_configure_device(dev);
2525
2526         fc_bsg_rportadd(shost, rport);
2527         /* ignore any bsg add error - we just can't do sgio */
2528
2529         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2530                 /* initiate a scan of the target */
2531                 rport->flags |= FC_RPORT_SCAN_PENDING;
2532                 scsi_queue_work(shost, &rport->scan_work);
2533         }
2534
2535         return rport;
2536
2537 delete_rport:
2538         transport_destroy_device(dev);
2539         spin_lock_irqsave(shost->host_lock, flags);
2540         list_del(&rport->peers);
2541         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2542         spin_unlock_irqrestore(shost->host_lock, flags);
2543         put_device(dev->parent);
2544         kfree(rport);
2545         return NULL;
2546 }
2547
2548 /**
2549  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2550  * @shost:      scsi host the remote port is connected to.
2551  * @channel:    Channel on shost port connected to.
2552  * @ids:        The world wide names, fc address, and FC4 port
2553  *              roles for the remote port.
2554  *
2555  * The LLDD calls this routine to notify the transport of the existence
2556  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2557  * of the port, it's FC address (port_id), and the FC4 roles that are
2558  * active for the port.
2559  *
2560  * For ports that are FCP targets (aka scsi targets), the FC transport
2561  * maintains consistent target id bindings on behalf of the LLDD.
2562  * A consistent target id binding is an assignment of a target id to
2563  * a remote port identifier, which persists while the scsi host is
2564  * attached. The remote port can disappear, then later reappear, and
2565  * it's target id assignment remains the same. This allows for shifts
2566  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2567  * changes to the scsi subsystem which is based on scsi host number and
2568  * target id values.  Bindings are only valid during the attachment of
2569  * the scsi host. If the host detaches, then later re-attaches, target
2570  * id bindings may change.
2571  *
2572  * This routine is responsible for returning a remote port structure.
2573  * The routine will search the list of remote ports it maintains
2574  * internally on behalf of consistent target id mappings. If found, the
2575  * remote port structure will be reused. Otherwise, a new remote port
2576  * structure will be allocated.
2577  *
2578  * Whenever a remote port is allocated, a new fc_remote_port class
2579  * device is created.
2580  *
2581  * Should not be called from interrupt context.
2582  *
2583  * Notes:
2584  *      This routine assumes no locks are held on entry.
2585  */
2586 struct fc_rport *
2587 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2588         struct fc_rport_identifiers  *ids)
2589 {
2590         struct fc_internal *fci = to_fc_internal(shost->transportt);
2591         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2592         struct fc_rport *rport;
2593         unsigned long flags;
2594         int match = 0;
2595
2596         /* ensure any stgt delete functions are done */
2597         fc_flush_work(shost);
2598
2599         /*
2600          * Search the list of "active" rports, for an rport that has been
2601          * deleted, but we've held off the real delete while the target
2602          * is in a "blocked" state.
2603          */
2604         spin_lock_irqsave(shost->host_lock, flags);
2605
2606         list_for_each_entry(rport, &fc_host->rports, peers) {
2607
2608                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2609                         (rport->channel == channel)) {
2610
2611                         switch (fc_host->tgtid_bind_type) {
2612                         case FC_TGTID_BIND_BY_WWPN:
2613                         case FC_TGTID_BIND_NONE:
2614                                 if (rport->port_name == ids->port_name)
2615                                         match = 1;
2616                                 break;
2617                         case FC_TGTID_BIND_BY_WWNN:
2618                                 if (rport->node_name == ids->node_name)
2619                                         match = 1;
2620                                 break;
2621                         case FC_TGTID_BIND_BY_ID:
2622                                 if (rport->port_id == ids->port_id)
2623                                         match = 1;
2624                                 break;
2625                         }
2626
2627                         if (match) {
2628
2629                                 memcpy(&rport->node_name, &ids->node_name,
2630                                         sizeof(rport->node_name));
2631                                 memcpy(&rport->port_name, &ids->port_name,
2632                                         sizeof(rport->port_name));
2633                                 rport->port_id = ids->port_id;
2634
2635                                 rport->port_state = FC_PORTSTATE_ONLINE;
2636                                 rport->roles = ids->roles;
2637
2638                                 spin_unlock_irqrestore(shost->host_lock, flags);
2639
2640                                 if (fci->f->dd_fcrport_size)
2641                                         memset(rport->dd_data, 0,
2642                                                 fci->f->dd_fcrport_size);
2643
2644                                 /*
2645                                  * If we were not a target, cancel the
2646                                  * io terminate and rport timers, and
2647                                  * we're done.
2648                                  *
2649                                  * If we were a target, but our new role
2650                                  * doesn't indicate a target, leave the
2651                                  * timers running expecting the role to
2652                                  * change as the target fully logs in. If
2653                                  * it doesn't, the target will be torn down.
2654                                  *
2655                                  * If we were a target, and our role shows
2656                                  * we're still a target, cancel the timers
2657                                  * and kick off a scan.
2658                                  */
2659
2660                                 /* was a target, not in roles */
2661                                 if ((rport->scsi_target_id != -1) &&
2662                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2663                                         return rport;
2664
2665                                 /*
2666                                  * Stop the fail io and dev_loss timers.
2667                                  * If they flush, the port_state will
2668                                  * be checked and will NOOP the function.
2669                                  */
2670                                 if (!cancel_delayed_work(&rport->fail_io_work))
2671                                         fc_flush_devloss(shost);
2672                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2673                                         fc_flush_devloss(shost);
2674
2675                                 spin_lock_irqsave(shost->host_lock, flags);
2676
2677                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2678                                                   FC_RPORT_DEVLOSS_PENDING |
2679                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2680
2681                                 /* if target, initiate a scan */
2682                                 if (rport->scsi_target_id != -1) {
2683                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2684                                         scsi_queue_work(shost,
2685                                                         &rport->scan_work);
2686                                         spin_unlock_irqrestore(shost->host_lock,
2687                                                         flags);
2688                                         scsi_target_unblock(&rport->dev);
2689                                 } else
2690                                         spin_unlock_irqrestore(shost->host_lock,
2691                                                         flags);
2692
2693                                 fc_bsg_goose_queue(rport);
2694
2695                                 return rport;
2696                         }
2697                 }
2698         }
2699
2700         /*
2701          * Search the bindings array
2702          * Note: if never a FCP target, you won't be on this list
2703          */
2704         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2705
2706                 /* search for a matching consistent binding */
2707
2708                 list_for_each_entry(rport, &fc_host->rport_bindings,
2709                                         peers) {
2710                         if (rport->channel != channel)
2711                                 continue;
2712
2713                         switch (fc_host->tgtid_bind_type) {
2714                         case FC_TGTID_BIND_BY_WWPN:
2715                                 if (rport->port_name == ids->port_name)
2716                                         match = 1;
2717                                 break;
2718                         case FC_TGTID_BIND_BY_WWNN:
2719                                 if (rport->node_name == ids->node_name)
2720                                         match = 1;
2721                                 break;
2722                         case FC_TGTID_BIND_BY_ID:
2723                                 if (rport->port_id == ids->port_id)
2724                                         match = 1;
2725                                 break;
2726                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2727                                 break;
2728                         }
2729
2730                         if (match) {
2731                                 list_move_tail(&rport->peers, &fc_host->rports);
2732                                 break;
2733                         }
2734                 }
2735
2736                 if (match) {
2737                         memcpy(&rport->node_name, &ids->node_name,
2738                                 sizeof(rport->node_name));
2739                         memcpy(&rport->port_name, &ids->port_name,
2740                                 sizeof(rport->port_name));
2741                         rport->port_id = ids->port_id;
2742                         rport->roles = ids->roles;
2743                         rport->port_state = FC_PORTSTATE_ONLINE;
2744                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2745
2746                         if (fci->f->dd_fcrport_size)
2747                                 memset(rport->dd_data, 0,
2748                                                 fci->f->dd_fcrport_size);
2749
2750                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2751                                 /* initiate a scan of the target */
2752                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2753                                 scsi_queue_work(shost, &rport->scan_work);
2754                                 spin_unlock_irqrestore(shost->host_lock, flags);
2755                                 scsi_target_unblock(&rport->dev);
2756                         } else
2757                                 spin_unlock_irqrestore(shost->host_lock, flags);
2758
2759                         return rport;
2760                 }
2761         }
2762
2763         spin_unlock_irqrestore(shost->host_lock, flags);
2764
2765         /* No consistent binding found - create new remote port entry */
2766         rport = fc_rport_create(shost, channel, ids);
2767
2768         return rport;
2769 }
2770 EXPORT_SYMBOL(fc_remote_port_add);
2771
2772
2773 /**
2774  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2775  * @rport:      The remote port that no longer exists
2776  *
2777  * The LLDD calls this routine to notify the transport that a remote
2778  * port is no longer part of the topology. Note: Although a port
2779  * may no longer be part of the topology, it may persist in the remote
2780  * ports displayed by the fc_host. We do this under 2 conditions:
2781  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2782  *   This allows the port to temporarily disappear, then reappear without
2783  *   disrupting the SCSI device tree attached to it. During the "blocked"
2784  *   period the port will still exist.
2785  * 2) If the port was a scsi target and disappears for longer than we
2786  *   expect, we'll delete the port and the tear down the SCSI device tree
2787  *   attached to it. However, we want to semi-persist the target id assigned
2788  *   to that port if it eventually does exist. The port structure will
2789  *   remain (although with minimal information) so that the target id
2790  *   bindings remails.
2791  *
2792  * If the remote port is not an FCP Target, it will be fully torn down
2793  * and deallocated, including the fc_remote_port class device.
2794  *
2795  * If the remote port is an FCP Target, the port will be placed in a
2796  * temporary blocked state. From the LLDD's perspective, the rport no
2797  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2798  * exists, but all sdevs on it are blocked from further I/O. The following
2799  * is then expected.
2800  *
2801  *   If the remote port does not return (signaled by a LLDD call to
2802  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2803  *   scsi target is removed - killing all outstanding i/o and removing the
2804  *   scsi devices attached ot it. The port structure will be marked Not
2805  *   Present and be partially cleared, leaving only enough information to
2806  *   recognize the remote port relative to the scsi target id binding if
2807  *   it later appears.  The port will remain as long as there is a valid
2808  *   binding (e.g. until the user changes the binding type or unloads the
2809  *   scsi host with the binding).
2810  *
2811  *   If the remote port returns within the dev_loss_tmo value (and matches
2812  *   according to the target id binding type), the port structure will be
2813  *   reused. If it is no longer a SCSI target, the target will be torn
2814  *   down. If it continues to be a SCSI target, then the target will be
2815  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2816  *   to ensure that all luns are detected.
2817  *
2818  * Called from normal process context only - cannot be called from interrupt.
2819  *
2820  * Notes:
2821  *      This routine assumes no locks are held on entry.
2822  */
2823 void
2824 fc_remote_port_delete(struct fc_rport  *rport)
2825 {
2826         struct Scsi_Host *shost = rport_to_shost(rport);
2827         int timeout = rport->dev_loss_tmo;
2828         unsigned long flags;
2829
2830         /*
2831          * No need to flush the fc_host work_q's, as all adds are synchronous.
2832          *
2833          * We do need to reclaim the rport scan work element, so eventually
2834          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2835          * there's still a scan pending.
2836          */
2837
2838         spin_lock_irqsave(shost->host_lock, flags);
2839
2840         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2841                 spin_unlock_irqrestore(shost->host_lock, flags);
2842                 return;
2843         }
2844
2845         /*
2846          * In the past, we if this was not an FCP-Target, we would
2847          * unconditionally just jump to deleting the rport.
2848          * However, rports can be used as node containers by the LLDD,
2849          * and its not appropriate to just terminate the rport at the
2850          * first sign of a loss in connectivity. The LLDD may want to
2851          * send ELS traffic to re-validate the login. If the rport is
2852          * immediately deleted, it makes it inappropriate for a node
2853          * container.
2854          * So... we now unconditionally wait dev_loss_tmo before
2855          * destroying an rport.
2856          */
2857
2858         rport->port_state = FC_PORTSTATE_BLOCKED;
2859
2860         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2861
2862         spin_unlock_irqrestore(shost->host_lock, flags);
2863
2864         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2865             shost->active_mode & MODE_TARGET)
2866                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2867
2868         scsi_target_block(&rport->dev);
2869
2870         /* see if we need to kill io faster than waiting for device loss */
2871         if ((rport->fast_io_fail_tmo != -1) &&
2872             (rport->fast_io_fail_tmo < timeout))
2873                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2874                                         rport->fast_io_fail_tmo * HZ);
2875
2876         /* cap the length the devices can be blocked until they are deleted */
2877         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2878 }
2879 EXPORT_SYMBOL(fc_remote_port_delete);
2880
2881 /**
2882  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2883  * @rport:      The remote port that changed.
2884  * @roles:      New roles for this port.
2885  *
2886  * Description: The LLDD calls this routine to notify the transport that the
2887  * roles on a remote port may have changed. The largest effect of this is
2888  * if a port now becomes a FCP Target, it must be allocated a
2889  * scsi target id.  If the port is no longer a FCP target, any
2890  * scsi target id value assigned to it will persist in case the
2891  * role changes back to include FCP Target. No changes in the scsi
2892  * midlayer will be invoked if the role changes (in the expectation
2893  * that the role will be resumed. If it doesn't normal error processing
2894  * will take place).
2895  *
2896  * Should not be called from interrupt context.
2897  *
2898  * Notes:
2899  *      This routine assumes no locks are held on entry.
2900  */
2901 void
2902 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2903 {
2904         struct Scsi_Host *shost = rport_to_shost(rport);
2905         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2906         unsigned long flags;
2907         int create = 0;
2908         int ret;
2909
2910         spin_lock_irqsave(shost->host_lock, flags);
2911         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2912                 if (rport->scsi_target_id == -1) {
2913                         rport->scsi_target_id = fc_host->next_target_id++;
2914                         create = 1;
2915                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2916                         create = 1;
2917         } else if (shost->active_mode & MODE_TARGET) {
2918                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2919                                              (char *)&rport->node_name);
2920                 if (ret)
2921                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2922                                ret);
2923         }
2924
2925         rport->roles = roles;
2926
2927         spin_unlock_irqrestore(shost->host_lock, flags);
2928
2929         if (create) {
2930                 /*
2931                  * There may have been a delete timer running on the
2932                  * port. Ensure that it is cancelled as we now know
2933                  * the port is an FCP Target.
2934                  * Note: we know the rport is exists and in an online
2935                  *  state as the LLDD would not have had an rport
2936                  *  reference to pass us.
2937                  *
2938                  * Take no action on the del_timer failure as the state
2939                  * machine state change will validate the
2940                  * transaction.
2941                  */
2942                 if (!cancel_delayed_work(&rport->fail_io_work))
2943                         fc_flush_devloss(shost);
2944                 if (!cancel_delayed_work(&rport->dev_loss_work))
2945                         fc_flush_devloss(shost);
2946
2947                 spin_lock_irqsave(shost->host_lock, flags);
2948                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2949                                   FC_RPORT_DEVLOSS_PENDING);
2950                 spin_unlock_irqrestore(shost->host_lock, flags);
2951
2952                 /* ensure any stgt delete functions are done */
2953                 fc_flush_work(shost);
2954
2955                 /* initiate a scan of the target */
2956                 spin_lock_irqsave(shost->host_lock, flags);
2957                 rport->flags |= FC_RPORT_SCAN_PENDING;
2958                 scsi_queue_work(shost, &rport->scan_work);
2959                 spin_unlock_irqrestore(shost->host_lock, flags);
2960                 scsi_target_unblock(&rport->dev);
2961         }
2962 }
2963 EXPORT_SYMBOL(fc_remote_port_rolechg);
2964
2965 /**
2966  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2967  * @work:       rport target that failed to reappear in the allotted time.
2968  *
2969  * Description: An attempt to delete a remote port blocks, and if it fails
2970  *              to return in the allotted time this gets called.
2971  */
2972 static void
2973 fc_timeout_deleted_rport(struct work_struct *work)
2974 {
2975         struct fc_rport *rport =
2976                 container_of(work, struct fc_rport, dev_loss_work.work);
2977         struct Scsi_Host *shost = rport_to_shost(rport);
2978         struct fc_internal *i = to_fc_internal(shost->transportt);
2979         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2980         unsigned long flags;
2981         int do_callback = 0;
2982
2983         spin_lock_irqsave(shost->host_lock, flags);
2984
2985         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2986
2987         /*
2988          * If the port is ONLINE, then it came back. If it was a SCSI
2989          * target, validate it still is. If not, tear down the
2990          * scsi_target on it.
2991          */
2992         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2993             (rport->scsi_target_id != -1) &&
2994             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2995                 dev_printk(KERN_ERR, &rport->dev,
2996                         "blocked FC remote port time out: no longer"
2997                         " a FCP target, removing starget\n");
2998                 spin_unlock_irqrestore(shost->host_lock, flags);
2999                 scsi_target_unblock(&rport->dev);
3000                 fc_queue_work(shost, &rport->stgt_delete_work);
3001                 return;
3002         }
3003
3004         /* NOOP state - we're flushing workq's */
3005         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3006                 spin_unlock_irqrestore(shost->host_lock, flags);
3007                 dev_printk(KERN_ERR, &rport->dev,
3008                         "blocked FC remote port time out: leaving"
3009                         " rport%s alone\n",
3010                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3011                 return;
3012         }
3013
3014         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3015             (rport->scsi_target_id == -1)) {
3016                 list_del(&rport->peers);
3017                 rport->port_state = FC_PORTSTATE_DELETED;
3018                 dev_printk(KERN_ERR, &rport->dev,
3019                         "blocked FC remote port time out: removing"
3020                         " rport%s\n",
3021                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3022                 fc_queue_work(shost, &rport->rport_delete_work);
3023                 spin_unlock_irqrestore(shost->host_lock, flags);
3024                 return;
3025         }
3026
3027         dev_printk(KERN_ERR, &rport->dev,
3028                 "blocked FC remote port time out: removing target and "
3029                 "saving binding\n");
3030
3031         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3032
3033         /*
3034          * Note: We do not remove or clear the hostdata area. This allows
3035          *   host-specific target data to persist along with the
3036          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3037          */
3038
3039         /*
3040          * Reinitialize port attributes that may change if the port comes back.
3041          */
3042         rport->maxframe_size = -1;
3043         rport->supported_classes = FC_COS_UNSPECIFIED;
3044         rport->roles = FC_PORT_ROLE_UNKNOWN;
3045         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3046         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3047
3048         /*
3049          * Pre-emptively kill I/O rather than waiting for the work queue
3050          * item to teardown the starget. (FCOE libFC folks prefer this
3051          * and to have the rport_port_id still set when it's done).
3052          */
3053         spin_unlock_irqrestore(shost->host_lock, flags);
3054         fc_terminate_rport_io(rport);
3055
3056         spin_lock_irqsave(shost->host_lock, flags);
3057
3058         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3059
3060                 /* remove the identifiers that aren't used in the consisting binding */
3061                 switch (fc_host->tgtid_bind_type) {
3062                 case FC_TGTID_BIND_BY_WWPN:
3063                         rport->node_name = -1;
3064                         rport->port_id = -1;
3065                         break;
3066                 case FC_TGTID_BIND_BY_WWNN:
3067                         rport->port_name = -1;
3068                         rport->port_id = -1;
3069                         break;
3070                 case FC_TGTID_BIND_BY_ID:
3071                         rport->node_name = -1;
3072                         rport->port_name = -1;
3073                         break;
3074                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3075                         break;
3076                 }
3077
3078                 /*
3079                  * As this only occurs if the remote port (scsi target)
3080                  * went away and didn't come back - we'll remove
3081                  * all attached scsi devices.
3082                  */
3083                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3084                 fc_queue_work(shost, &rport->stgt_delete_work);
3085
3086                 do_callback = 1;
3087         }
3088
3089         spin_unlock_irqrestore(shost->host_lock, flags);
3090
3091         /*
3092          * Notify the driver that the rport is now dead. The LLDD will
3093          * also guarantee that any communication to the rport is terminated
3094          *
3095          * Note: we set the CALLBK_DONE flag above to correspond
3096          */
3097         if (do_callback && i->f->dev_loss_tmo_callbk)
3098                 i->f->dev_loss_tmo_callbk(rport);
3099 }
3100
3101
3102 /**
3103  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3104  * @work:       rport to terminate io on.
3105  *
3106  * Notes: Only requests the failure of the io, not that all are flushed
3107  *    prior to returning.
3108  */
3109 static void
3110 fc_timeout_fail_rport_io(struct work_struct *work)
3111 {
3112         struct fc_rport *rport =
3113                 container_of(work, struct fc_rport, fail_io_work.work);
3114
3115         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3116                 return;
3117
3118         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3119         fc_terminate_rport_io(rport);
3120 }
3121
3122 /**
3123  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3124  * @work:       remote port to be scanned.
3125  */
3126 static void
3127 fc_scsi_scan_rport(struct work_struct *work)
3128 {
3129         struct fc_rport *rport =
3130                 container_of(work, struct fc_rport, scan_work);
3131         struct Scsi_Host *shost = rport_to_shost(rport);
3132         struct fc_internal *i = to_fc_internal(shost->transportt);
3133         unsigned long flags;
3134
3135         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3136             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3137             !(i->f->disable_target_scan)) {
3138                 scsi_scan_target(&rport->dev, rport->channel,
3139                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3140         }
3141
3142         spin_lock_irqsave(shost->host_lock, flags);
3143         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3144         spin_unlock_irqrestore(shost->host_lock, flags);
3145 }
3146
3147
3148 /**
3149  * fc_vport_setup - allocates and creates a FC virtual port.
3150  * @shost:      scsi host the virtual port is connected to.
3151  * @channel:    Channel on shost port connected to.
3152  * @pdev:       parent device for vport
3153  * @ids:        The world wide names, FC4 port roles, etc for
3154  *              the virtual port.
3155  * @ret_vport:  The pointer to the created vport.
3156  *
3157  * Allocates and creates the vport structure, calls the parent host
3158  * to instantiate the vport, the completes w/ class and sysfs creation.
3159  *
3160  * Notes:
3161  *      This routine assumes no locks are held on entry.
3162  */
3163 static int
3164 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3165         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3166 {
3167         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3168         struct fc_internal *fci = to_fc_internal(shost->transportt);
3169         struct fc_vport *vport;
3170         struct device *dev;
3171         unsigned long flags;
3172         size_t size;
3173         int error;
3174
3175         *ret_vport = NULL;
3176
3177         if ( ! fci->f->vport_create)
3178                 return -ENOENT;
3179
3180         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3181         vport = kzalloc(size, GFP_KERNEL);
3182         if (unlikely(!vport)) {
3183                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3184                 return -ENOMEM;
3185         }
3186
3187         vport->vport_state = FC_VPORT_UNKNOWN;
3188         vport->vport_last_state = FC_VPORT_UNKNOWN;
3189         vport->node_name = ids->node_name;
3190         vport->port_name = ids->port_name;
3191         vport->roles = ids->roles;
3192         vport->vport_type = ids->vport_type;
3193         if (fci->f->dd_fcvport_size)
3194                 vport->dd_data = &vport[1];
3195         vport->shost = shost;
3196         vport->channel = channel;
3197         vport->flags = FC_VPORT_CREATING;
3198         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3199
3200         spin_lock_irqsave(shost->host_lock, flags);
3201
3202         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3203                 spin_unlock_irqrestore(shost->host_lock, flags);
3204                 kfree(vport);
3205                 return -ENOSPC;
3206         }
3207         fc_host->npiv_vports_inuse++;
3208         vport->number = fc_host->next_vport_number++;
3209         list_add_tail(&vport->peers, &fc_host->vports);
3210         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3211
3212         spin_unlock_irqrestore(shost->host_lock, flags);
3213
3214         dev = &vport->dev;
3215         device_initialize(dev);                 /* takes self reference */
3216         dev->parent = get_device(pdev);         /* takes parent reference */
3217         dev->release = fc_vport_dev_release;
3218         dev_set_name(dev, "vport-%d:%d-%d",
3219                      shost->host_no, channel, vport->number);
3220         transport_setup_device(dev);
3221
3222         error = device_add(dev);
3223         if (error) {
3224                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3225                 goto delete_vport;
3226         }
3227         transport_add_device(dev);
3228         transport_configure_device(dev);
3229
3230         error = fci->f->vport_create(vport, ids->disable);
3231         if (error) {
3232                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3233                 goto delete_vport_all;
3234         }
3235
3236         /*
3237          * if the parent isn't the physical adapter's Scsi_Host, ensure
3238          * the Scsi_Host at least contains ia symlink to the vport.
3239          */
3240         if (pdev != &shost->shost_gendev) {
3241                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3242                                  &dev->kobj, dev_name(dev));
3243                 if (error)
3244                         printk(KERN_ERR
3245                                 "%s: Cannot create vport symlinks for "
3246                                 "%s, err=%d\n",
3247                                 __func__, dev_name(dev), error);
3248         }
3249         spin_lock_irqsave(shost->host_lock, flags);
3250         vport->flags &= ~FC_VPORT_CREATING;
3251         spin_unlock_irqrestore(shost->host_lock, flags);
3252
3253         dev_printk(KERN_NOTICE, pdev,
3254                         "%s created via shost%d channel %d\n", dev_name(dev),
3255                         shost->host_no, channel);
3256
3257         *ret_vport = vport;
3258
3259         return 0;
3260
3261 delete_vport_all:
3262         transport_remove_device(dev);
3263         device_del(dev);
3264 delete_vport:
3265         transport_destroy_device(dev);
3266         spin_lock_irqsave(shost->host_lock, flags);
3267         list_del(&vport->peers);
3268         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3269         fc_host->npiv_vports_inuse--;
3270         spin_unlock_irqrestore(shost->host_lock, flags);
3271         put_device(dev->parent);
3272         kfree(vport);
3273
3274         return error;
3275 }
3276
3277 /**
3278  * fc_vport_create - Admin App or LLDD requests creation of a vport
3279  * @shost:      scsi host the virtual port is connected to.
3280  * @channel:    channel on shost port connected to.
3281  * @ids:        The world wide names, FC4 port roles, etc for
3282  *              the virtual port.
3283  *
3284  * Notes:
3285  *      This routine assumes no locks are held on entry.
3286  */
3287 struct fc_vport *
3288 fc_vport_create(struct Scsi_Host *shost, int channel,
3289         struct fc_vport_identifiers *ids)
3290 {
3291         int stat;
3292         struct fc_vport *vport;
3293
3294         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3295                  ids, &vport);
3296         return stat ? NULL : vport;
3297 }
3298 EXPORT_SYMBOL(fc_vport_create);
3299
3300 /**
3301  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3302  * @vport:      fc_vport to be terminated
3303  *
3304  * Calls the LLDD vport_delete() function, then deallocates and removes
3305  * the vport from the shost and object tree.
3306  *
3307  * Notes:
3308  *      This routine assumes no locks are held on entry.
3309  */
3310 int
3311 fc_vport_terminate(struct fc_vport *vport)
3312 {
3313         struct Scsi_Host *shost = vport_to_shost(vport);
3314         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3315         struct fc_internal *i = to_fc_internal(shost->transportt);
3316         struct device *dev = &vport->dev;
3317         unsigned long flags;
3318         int stat;
3319
3320         spin_lock_irqsave(shost->host_lock, flags);
3321         if (vport->flags & FC_VPORT_CREATING) {
3322                 spin_unlock_irqrestore(shost->host_lock, flags);
3323                 return -EBUSY;
3324         }
3325         if (vport->flags & (FC_VPORT_DEL)) {
3326                 spin_unlock_irqrestore(shost->host_lock, flags);
3327                 return -EALREADY;
3328         }
3329         vport->flags |= FC_VPORT_DELETING;
3330         spin_unlock_irqrestore(shost->host_lock, flags);
3331
3332         if (i->f->vport_delete)
3333                 stat = i->f->vport_delete(vport);
3334         else
3335                 stat = -ENOENT;
3336
3337         spin_lock_irqsave(shost->host_lock, flags);
3338         vport->flags &= ~FC_VPORT_DELETING;
3339         if (!stat) {
3340                 vport->flags |= FC_VPORT_DELETED;
3341                 list_del(&vport->peers);
3342                 fc_host->npiv_vports_inuse--;
3343                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3344         }
3345         spin_unlock_irqrestore(shost->host_lock, flags);
3346
3347         if (stat)
3348                 return stat;
3349
3350         if (dev->parent != &shost->shost_gendev)
3351                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3352         transport_remove_device(dev);
3353         device_del(dev);
3354         transport_destroy_device(dev);
3355
3356         /*
3357          * Removing our self-reference should mean our
3358          * release function gets called, which will drop the remaining
3359          * parent reference and free the data structure.
3360          */
3361         put_device(dev);                        /* for self-reference */
3362
3363         return 0; /* SUCCESS */
3364 }
3365 EXPORT_SYMBOL(fc_vport_terminate);
3366
3367 /**
3368  * fc_vport_sched_delete - workq-based delete request for a vport
3369  * @work:       vport to be deleted.
3370  */
3371 static void
3372 fc_vport_sched_delete(struct work_struct *work)
3373 {
3374         struct fc_vport *vport =
3375                 container_of(work, struct fc_vport, vport_delete_work);
3376         int stat;
3377
3378         stat = fc_vport_terminate(vport);
3379         if (stat)
3380                 dev_printk(KERN_ERR, vport->dev.parent,
3381                         "%s: %s could not be deleted created via "
3382                         "shost%d channel %d - error %d\n", __func__,
3383                         dev_name(&vport->dev), vport->shost->host_no,
3384                         vport->channel, stat);
3385 }
3386
3387
3388 /*
3389  * BSG support
3390  */
3391
3392
3393 /**
3394  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3395  * @job:        fc_bsg_job that is to be torn down
3396  */
3397 static void
3398 fc_destroy_bsgjob(struct fc_bsg_job *job)
3399 {
3400         unsigned long flags;
3401
3402         spin_lock_irqsave(&job->job_lock, flags);
3403         if (job->ref_cnt) {
3404                 spin_unlock_irqrestore(&job->job_lock, flags);
3405                 return;
3406         }
3407         spin_unlock_irqrestore(&job->job_lock, flags);
3408
3409         put_device(job->dev);   /* release reference for the request */
3410
3411         kfree(job->request_payload.sg_list);
3412         kfree(job->reply_payload.sg_list);
3413         kfree(job);
3414 }
3415
3416 /**
3417  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3418  *                  completed
3419  * @job:        fc_bsg_job that is complete
3420  */
3421 static void
3422 fc_bsg_jobdone(struct fc_bsg_job *job)
3423 {
3424         struct request *req = job->req;
3425         struct request *rsp = req->next_rq;
3426         int err;
3427
3428         err = job->req->errors = job->reply->result;
3429
3430         if (err < 0)
3431                 /* we're only returning the result field in the reply */
3432                 job->req->sense_len = sizeof(uint32_t);
3433         else
3434                 job->req->sense_len = job->reply_len;
3435
3436         /* we assume all request payload was transferred, residual == 0 */
3437         req->resid_len = 0;
3438
3439         if (rsp) {
3440                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3441
3442                 /* set reply (bidi) residual */
3443                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3444                                       rsp->resid_len);
3445         }
3446         blk_complete_request(req);
3447 }
3448
3449 /**
3450  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3451  * @rq:        BSG request that holds the job to be destroyed
3452  */
3453 static void fc_bsg_softirq_done(struct request *rq)
3454 {
3455         struct fc_bsg_job *job = rq->special;
3456         unsigned long flags;
3457
3458         spin_lock_irqsave(&job->job_lock, flags);
3459         job->state_flags |= FC_RQST_STATE_DONE;
3460         job->ref_cnt--;
3461         spin_unlock_irqrestore(&job->job_lock, flags);
3462
3463         blk_end_request_all(rq, rq->errors);
3464         fc_destroy_bsgjob(job);
3465 }
3466
3467 /**
3468  * fc_bsg_job_timeout - handler for when a bsg request timesout
3469  * @req:        request that timed out
3470  */
3471 static enum blk_eh_timer_return
3472 fc_bsg_job_timeout(struct request *req)
3473 {
3474         struct fc_bsg_job *job = (void *) req->special;
3475         struct Scsi_Host *shost = job->shost;
3476         struct fc_internal *i = to_fc_internal(shost->transportt);
3477         unsigned long flags;
3478         int err = 0, done = 0;
3479
3480         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3481                 return BLK_EH_RESET_TIMER;
3482
3483         spin_lock_irqsave(&job->job_lock, flags);
3484         if (job->state_flags & FC_RQST_STATE_DONE)
3485                 done = 1;
3486         else
3487                 job->ref_cnt++;
3488         spin_unlock_irqrestore(&job->job_lock, flags);
3489
3490         if (!done && i->f->bsg_timeout) {
3491                 /* call LLDD to abort the i/o as it has timed out */
3492                 err = i->f->bsg_timeout(job);
3493                 if (err)
3494                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3495                                 "abort failed with status %d\n", err);
3496         }
3497
3498         /* the blk_end_sync_io() doesn't check the error */
3499         if (done)
3500                 return BLK_EH_NOT_HANDLED;
3501         else
3502                 return BLK_EH_HANDLED;
3503 }
3504
3505 static int
3506 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3507 {
3508         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3509
3510         BUG_ON(!req->nr_phys_segments);
3511
3512         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3513         if (!buf->sg_list)
3514                 return -ENOMEM;
3515         sg_init_table(buf->sg_list, req->nr_phys_segments);
3516         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3517         buf->payload_len = blk_rq_bytes(req);
3518         return 0;
3519 }
3520
3521
3522 /**
3523  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3524  *                   bsg request
3525  * @shost:      SCSI Host corresponding to the bsg object
3526  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3527  * @req:        BSG request that needs a job structure
3528  */
3529 static int
3530 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3531         struct request *req)
3532 {
3533         struct fc_internal *i = to_fc_internal(shost->transportt);
3534         struct request *rsp = req->next_rq;
3535         struct fc_bsg_job *job;
3536         int ret;
3537
3538         BUG_ON(req->special);
3539
3540         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3541                         GFP_KERNEL);
3542         if (!job)
3543                 return -ENOMEM;
3544
3545         /*
3546          * Note: this is a bit silly.
3547          * The request gets formatted as a SGIO v4 ioctl request, which
3548          * then gets reformatted as a blk request, which then gets
3549          * reformatted as a fc bsg request. And on completion, we have
3550          * to wrap return results such that SGIO v4 thinks it was a scsi
3551          * status.  I hope this was all worth it.
3552          */
3553
3554         req->special = job;
3555         job->shost = shost;
3556         job->rport = rport;
3557         job->req = req;
3558         if (i->f->dd_bsg_size)
3559                 job->dd_data = (void *)&job[1];
3560         spin_lock_init(&job->job_lock);
3561         job->request = (struct fc_bsg_request *)req->cmd;
3562         job->request_len = req->cmd_len;
3563         job->reply = req->sense;
3564         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3565                                                  * allocated */
3566         if (req->bio) {
3567                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3568                 if (ret)
3569                         goto failjob_rls_job;
3570         }
3571         if (rsp && rsp->bio) {
3572                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3573                 if (ret)
3574                         goto failjob_rls_rqst_payload;
3575         }
3576         job->job_done = fc_bsg_jobdone;
3577         if (rport)
3578                 job->dev = &rport->dev;
3579         else
3580                 job->dev = &shost->shost_gendev;
3581         get_device(job->dev);           /* take a reference for the request */
3582
3583         job->ref_cnt = 1;
3584
3585         return 0;
3586
3587
3588 failjob_rls_rqst_payload:
3589         kfree(job->request_payload.sg_list);
3590 failjob_rls_job:
3591         kfree(job);
3592         return -ENOMEM;
3593 }
3594
3595
3596 enum fc_dispatch_result {
3597         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3598         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3599         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3600 };
3601
3602
3603 /**
3604  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3605  * @q:          fc host request queue
3606  * @shost:      scsi host rport attached to
3607  * @job:        bsg job to be processed
3608  */
3609 static enum fc_dispatch_result
3610 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3611                          struct fc_bsg_job *job)
3612 {
3613         struct fc_internal *i = to_fc_internal(shost->transportt);
3614         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3615         int ret;
3616
3617         /* Validate the host command */
3618         switch (job->request->msgcode) {
3619         case FC_BSG_HST_ADD_RPORT:
3620                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3621                 break;
3622
3623         case FC_BSG_HST_DEL_RPORT:
3624                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3625                 break;
3626
3627         case FC_BSG_HST_ELS_NOLOGIN:
3628                 cmdlen += sizeof(struct fc_bsg_host_els);
3629                 /* there better be a xmt and rcv payloads */
3630                 if ((!job->request_payload.payload_len) ||
3631                     (!job->reply_payload.payload_len)) {
3632                         ret = -EINVAL;
3633                         goto fail_host_msg;
3634                 }
3635                 break;
3636
3637         case FC_BSG_HST_CT:
3638                 cmdlen += sizeof(struct fc_bsg_host_ct);
3639                 /* there better be xmt and rcv payloads */
3640                 if ((!job->request_payload.payload_len) ||
3641                     (!job->reply_payload.payload_len)) {
3642                         ret = -EINVAL;
3643                         goto fail_host_msg;
3644                 }
3645                 break;
3646
3647         case FC_BSG_HST_VENDOR:
3648                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3649                 if ((shost->hostt->vendor_id == 0L) ||
3650                     (job->request->rqst_data.h_vendor.vendor_id !=
3651                         shost->hostt->vendor_id)) {
3652                         ret = -ESRCH;
3653                         goto fail_host_msg;
3654                 }
3655                 break;
3656
3657         default:
3658                 ret = -EBADR;
3659                 goto fail_host_msg;
3660         }
3661
3662         /* check if we really have all the request data needed */
3663         if (job->request_len < cmdlen) {
3664                 ret = -ENOMSG;
3665                 goto fail_host_msg;
3666         }
3667
3668         ret = i->f->bsg_request(job);
3669         if (!ret)
3670                 return FC_DISPATCH_UNLOCKED;
3671
3672 fail_host_msg:
3673         /* return the errno failure code as the only status */
3674         BUG_ON(job->reply_len < sizeof(uint32_t));
3675         job->reply->result = ret;
3676         job->reply_len = sizeof(uint32_t);
3677         fc_bsg_jobdone(job);
3678         return FC_DISPATCH_UNLOCKED;
3679 }
3680
3681
3682 /*
3683  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3684  * @rport:      rport to be restarted
3685  */
3686 static void
3687 fc_bsg_goose_queue(struct fc_rport *rport)
3688 {
3689         int flagset;
3690         unsigned long flags;
3691
3692         if (!rport->rqst_q)
3693                 return;
3694
3695         get_device(&rport->dev);
3696
3697         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3698         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3699                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3700         if (flagset)
3701                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3702         __blk_run_queue(rport->rqst_q);
3703         if (flagset)
3704                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3705         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3706
3707         put_device(&rport->dev);
3708 }
3709
3710
3711 /**
3712  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3713  * @q:          rport request queue
3714  * @shost:      scsi host rport attached to
3715  * @rport:      rport request destined to
3716  * @job:        bsg job to be processed
3717  */
3718 static enum fc_dispatch_result
3719 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3720                          struct fc_rport *rport, struct fc_bsg_job *job)
3721 {
3722         struct fc_internal *i = to_fc_internal(shost->transportt);
3723         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3724         int ret;
3725
3726         /* Validate the rport command */
3727         switch (job->request->msgcode) {
3728         case FC_BSG_RPT_ELS:
3729                 cmdlen += sizeof(struct fc_bsg_rport_els);
3730                 goto check_bidi;
3731
3732         case FC_BSG_RPT_CT:
3733                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3734 check_bidi:
3735                 /* there better be xmt and rcv payloads */
3736                 if ((!job->request_payload.payload_len) ||
3737                     (!job->reply_payload.payload_len)) {
3738                         ret = -EINVAL;
3739                         goto fail_rport_msg;
3740                 }
3741                 break;
3742         default:
3743                 ret = -EBADR;
3744                 goto fail_rport_msg;
3745         }
3746
3747         /* check if we really have all the request data needed */
3748         if (job->request_len < cmdlen) {
3749                 ret = -ENOMSG;
3750                 goto fail_rport_msg;
3751         }
3752
3753         ret = i->f->bsg_request(job);
3754         if (!ret)
3755                 return FC_DISPATCH_UNLOCKED;
3756
3757 fail_rport_msg:
3758         /* return the errno failure code as the only status */
3759         BUG_ON(job->reply_len < sizeof(uint32_t));
3760         job->reply->result = ret;
3761         job->reply_len = sizeof(uint32_t);
3762         fc_bsg_jobdone(job);
3763         return FC_DISPATCH_UNLOCKED;
3764 }
3765
3766
3767 /**
3768  * fc_bsg_request_handler - generic handler for bsg requests
3769  * @q:          request queue to manage
3770  * @shost:      Scsi_Host related to the bsg object
3771  * @rport:      FC remote port related to the bsg object (optional)
3772  * @dev:        device structure for bsg object
3773  */
3774 static void
3775 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3776                        struct fc_rport *rport, struct device *dev)
3777 {
3778         struct request *req;
3779         struct fc_bsg_job *job;
3780         enum fc_dispatch_result ret;
3781
3782         if (!get_device(dev))
3783                 return;
3784
3785         while (!blk_queue_plugged(q)) {
3786                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED))
3787                                 break;
3788
3789                 req = blk_fetch_request(q);
3790                 if (!req)
3791                         break;
3792
3793                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3794                         req->errors = -ENXIO;
3795                         spin_unlock_irq(q->queue_lock);
3796                         blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3797                         spin_lock_irq(q->queue_lock);
3798                         continue;
3799                 }
3800
3801                 spin_unlock_irq(q->queue_lock);
3802
3803                 ret = fc_req_to_bsgjob(shost, rport, req);
3804                 if (ret) {
3805                         req->errors = ret;
3806                         blk_end_request(req, ret, blk_rq_bytes(req));
3807                         spin_lock_irq(q->queue_lock);
3808                         continue;
3809                 }
3810
3811                 job = req->special;
3812
3813                 /* check if we have the msgcode value at least */
3814                 if (job->request_len < sizeof(uint32_t)) {
3815                         BUG_ON(job->reply_len < sizeof(uint32_t));
3816                         job->reply->result = -ENOMSG;
3817                         job->reply_len = sizeof(uint32_t);
3818                         fc_bsg_jobdone(job);
3819                         spin_lock_irq(q->queue_lock);
3820                         continue;
3821                 }
3822
3823                 /* the dispatch routines will unlock the queue_lock */
3824                 if (rport)
3825                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3826                 else
3827                         ret = fc_bsg_host_dispatch(q, shost, job);
3828
3829                 /* did dispatcher hit state that can't process any more */
3830                 if (ret == FC_DISPATCH_BREAK)
3831                         break;
3832
3833                 /* did dispatcher had released the lock */
3834                 if (ret == FC_DISPATCH_UNLOCKED)
3835                         spin_lock_irq(q->queue_lock);
3836         }
3837
3838         spin_unlock_irq(q->queue_lock);
3839         put_device(dev);
3840         spin_lock_irq(q->queue_lock);
3841 }
3842
3843
3844 /**
3845  * fc_bsg_host_handler - handler for bsg requests for a fc host
3846  * @q:          fc host request queue
3847  */
3848 static void
3849 fc_bsg_host_handler(struct request_queue *q)
3850 {
3851         struct Scsi_Host *shost = q->queuedata;
3852
3853         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3854 }
3855
3856
3857 /**
3858  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3859  * @q:          rport request queue
3860  */
3861 static void
3862 fc_bsg_rport_handler(struct request_queue *q)
3863 {
3864         struct fc_rport *rport = q->queuedata;
3865         struct Scsi_Host *shost = rport_to_shost(rport);
3866
3867         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3868 }
3869
3870
3871 /**
3872  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3873  * @shost:      shost for fc_host
3874  * @fc_host:    fc_host adding the structures to
3875  */
3876 static int
3877 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3878 {
3879         struct device *dev = &shost->shost_gendev;
3880         struct fc_internal *i = to_fc_internal(shost->transportt);
3881         struct request_queue *q;
3882         int err;
3883         char bsg_name[20];
3884
3885         fc_host->rqst_q = NULL;
3886
3887         if (!i->f->bsg_request)
3888                 return -ENOTSUPP;
3889
3890         snprintf(bsg_name, sizeof(bsg_name),
3891                  "fc_host%d", shost->host_no);
3892
3893         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3894         if (!q) {
3895                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3896                                 "initialize - no request queue\n",
3897                                  shost->host_no);
3898                 return -ENOMEM;
3899         }
3900
3901         q->queuedata = shost;
3902         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3903         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3904         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3905         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3906
3907         err = bsg_register_queue(q, dev, bsg_name, NULL);
3908         if (err) {
3909                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3910                                 "initialize - register queue\n",
3911                                 shost->host_no);
3912                 blk_cleanup_queue(q);
3913                 return err;
3914         }
3915
3916         fc_host->rqst_q = q;
3917         return 0;
3918 }
3919
3920
3921 /**
3922  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3923  * @shost:      shost that rport is attached to
3924  * @rport:      rport that the bsg hooks are being attached to
3925  */
3926 static int
3927 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3928 {
3929         struct device *dev = &rport->dev;
3930         struct fc_internal *i = to_fc_internal(shost->transportt);
3931         struct request_queue *q;
3932         int err;
3933
3934         rport->rqst_q = NULL;
3935
3936         if (!i->f->bsg_request)
3937                 return -ENOTSUPP;
3938
3939         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3940         if (!q) {
3941                 printk(KERN_ERR "%s: bsg interface failed to "
3942                                 "initialize - no request queue\n",
3943                                  dev->kobj.name);
3944                 return -ENOMEM;
3945         }
3946
3947         q->queuedata = rport;
3948         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3949         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3950         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3951         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3952
3953         err = bsg_register_queue(q, dev, NULL, NULL);
3954         if (err) {
3955                 printk(KERN_ERR "%s: bsg interface failed to "
3956                                 "initialize - register queue\n",
3957                                  dev->kobj.name);
3958                 blk_cleanup_queue(q);
3959                 return err;
3960         }
3961
3962         rport->rqst_q = q;
3963         return 0;
3964 }
3965
3966
3967 /**
3968  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3969  * @q:  the request_queue that is to be torn down.
3970  */
3971 static void
3972 fc_bsg_remove(struct request_queue *q)
3973 {
3974         if (q) {
3975                 bsg_unregister_queue(q);
3976                 blk_cleanup_queue(q);
3977         }
3978 }
3979
3980
3981 /* Original Author:  Martin Hicks */
3982 MODULE_AUTHOR("James Smart");
3983 MODULE_DESCRIPTION("FC Transport Attributes");
3984 MODULE_LICENSE("GPL");
3985
3986 module_init(fc_transport_init);
3987 module_exit(fc_transport_exit);