git.oblomov.eu Git - 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_priv.h"
  39 #include "scsi_transport_fc_internal.h"
  40
  41 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  42 static void fc_vport_sched_delete(struct work_struct *work);
  43
  44 /*
  45  * This is a temporary carrier for creating a vport. It will eventually
  46  * be replaced  by a real message definition for sgio or netlink.
  47  *
  48  * fc_vport_identifiers: This set of data contains all elements
  49  * to uniquely identify and instantiate a FC virtual port.
  50  *
  51  * Notes:
  52  *   symbolic_name: The driver is to append the symbolic_name string data
  53  *      to the symbolic_node_name data that it generates by default.
  54  *      the resulting combination should then be registered with the switch.
  55  *      It is expected that things like Xen may stuff a VM title into
  56  *      this field.
  57  */
  58 struct fc_vport_identifiers {
  59         u64 node_name;
  60         u64 port_name;
  61         u32 roles;
  62         bool disable;
  63         enum fc_port_type vport_type;   /* only FC_PORTTYPE_NPIV allowed */
  64         char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];
  65 };
  66
  67 static int fc_vport_create(struct Scsi_Host *shost, int channel,
  68         struct device *pdev, struct fc_vport_identifiers  *ids,
  69         struct fc_vport **vport);
  70
  71 /*
  72  * Redefine so that we can have same named attributes in the
  73  * sdev/starget/host objects.
  74  */
  75 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  76 struct device_attribute device_attr_##_prefix##_##_name =       \
  77         __ATTR(_name,_mode,_show,_store)
  78
  79 #define fc_enum_name_search(title, table_type, table)                   \
  80 static const char *get_fc_##title##_name(enum table_type table_key)     \
  81 {                                                                       \
  82         int i;                                                          \
  83         char *name = NULL;                                              \
  84                                                                         \
  85         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  86                 if (table[i].value == table_key) {                      \
  87                         name = table[i].name;                           \
  88                         break;                                          \
  89                 }                                                       \
  90         }                                                               \
  91         return name;                                                    \
  92 }
  93
  94 #define fc_enum_name_match(title, table_type, table)                    \
  95 static int get_fc_##title##_match(const char *table_key,                \
  96                 enum table_type *value)                                 \
  97 {                                                                       \
  98         int i;                                                          \
  99                                                                         \
 100         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
 101                 if (strncmp(table_key, table[i].name,                   \
 102                                 table[i].matchlen) == 0) {              \
 103                         *value = table[i].value;                        \
 104                         return 0; /* success */                         \
 105                 }                                                       \
 106         }                                                               \
 107         return 1; /* failure */                                         \
 108 }
 109
 110
 111 /* Convert fc_port_type values to ascii string name */
 112 static struct {
 113         enum fc_port_type       value;
 114         char                    *name;
 115 } fc_port_type_names[] = {
 116         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 117         { FC_PORTTYPE_OTHER,            "Other" },
 118         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 119         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 120         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 121         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 122         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
 123         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 124 };
 125 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 126 #define FC_PORTTYPE_MAX_NAMELEN         50
 127
 128 /* Reuse fc_port_type enum function for vport_type */
 129 #define get_fc_vport_type_name get_fc_port_type_name
 130
 131
 132 /* Convert fc_host_event_code values to ascii string name */
 133 static const struct {
 134         enum fc_host_event_code         value;
 135         char                            *name;
 136 } fc_host_event_code_names[] = {
 137         { FCH_EVT_LIP,                  "lip" },
 138         { FCH_EVT_LINKUP,               "link_up" },
 139         { FCH_EVT_LINKDOWN,             "link_down" },
 140         { FCH_EVT_LIPRESET,             "lip_reset" },
 141         { FCH_EVT_RSCN,                 "rscn" },
 142         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 143         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 144         { FCH_EVT_PORT_ONLINE,          "port_online" },
 145         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 146         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 147         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 148         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 149 };
 150 fc_enum_name_search(host_event_code, fc_host_event_code,
 151                 fc_host_event_code_names)
 152 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 153
 154
 155 /* Convert fc_port_state values to ascii string name */
 156 static struct {
 157         enum fc_port_state      value;
 158         char                    *name;
 159 } fc_port_state_names[] = {
 160         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 161         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 162         { FC_PORTSTATE_ONLINE,          "Online" },
 163         { FC_PORTSTATE_OFFLINE,         "Offline" },
 164         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 165         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 166         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 167         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 168         { FC_PORTSTATE_ERROR,           "Error" },
 169         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 170         { FC_PORTSTATE_DELETED,         "Deleted" },
 171 };
 172 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 173 #define FC_PORTSTATE_MAX_NAMELEN        20
 174
 175
 176 /* Convert fc_vport_state values to ascii string name */
 177 static struct {
 178         enum fc_vport_state     value;
 179         char                    *name;
 180 } fc_vport_state_names[] = {
 181         { FC_VPORT_UNKNOWN,             "Unknown" },
 182         { FC_VPORT_ACTIVE,              "Active" },
 183         { FC_VPORT_DISABLED,            "Disabled" },
 184         { FC_VPORT_LINKDOWN,            "Linkdown" },
 185         { FC_VPORT_INITIALIZING,        "Initializing" },
 186         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 187         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 188         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 189         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 190         { FC_VPORT_FAILED,              "VPort Failed" },
 191 };
 192 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 193 #define FC_VPORTSTATE_MAX_NAMELEN       24
 194
 195 /* Reuse fc_vport_state enum function for vport_last_state */
 196 #define get_fc_vport_last_state_name get_fc_vport_state_name
 197
 198
 199 /* Convert fc_tgtid_binding_type values to ascii string name */
 200 static const struct {
 201         enum fc_tgtid_binding_type      value;
 202         char                            *name;
 203         int                             matchlen;
 204 } fc_tgtid_binding_type_names[] = {
 205         { FC_TGTID_BIND_NONE, "none", 4 },
 206         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 207         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 208         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 209 };
 210 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 211                 fc_tgtid_binding_type_names)
 212 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 213                 fc_tgtid_binding_type_names)
 214 #define FC_BINDTYPE_MAX_NAMELEN 30
 215
 216
 217 #define fc_bitfield_name_search(title, table)                   \
 218 static ssize_t                                                  \
 219 get_fc_##title##_names(u32 table_key, char *buf)                \
 220 {                                                               \
 221         char *prefix = "";                                      \
 222         ssize_t len = 0;                                        \
 223         int i;                                                  \
 224                                                                 \
 225         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 226                 if (table[i].value & table_key) {               \
 227                         len += sprintf(buf + len, "%s%s",       \
 228                                 prefix, table[i].name);         \
 229                         prefix = ", ";                          \
 230                 }                                               \
 231         }                                                       \
 232         len += sprintf(buf + len, "\n");                        \
 233         return len;                                             \
 234 }
 235
 236
 237 /* Convert FC_COS bit values to ascii string name */
 238 static const struct {
 239         u32                     value;
 240         char                    *name;
 241 } fc_cos_names[] = {
 242         { FC_COS_CLASS1,        "Class 1" },
 243         { FC_COS_CLASS2,        "Class 2" },
 244         { FC_COS_CLASS3,        "Class 3" },
 245         { FC_COS_CLASS4,        "Class 4" },
 246         { FC_COS_CLASS6,        "Class 6" },
 247 };
 248 fc_bitfield_name_search(cos, fc_cos_names)
 249
 250
 251 /* Convert FC_PORTSPEED bit values to ascii string name */
 252 static const struct {
 253         u32                     value;
 254         char                    *name;
 255 } fc_port_speed_names[] = {
 256         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 257         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 258         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 259         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 260         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 261         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 262         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 263 };
 264 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 265
 266
 267 static int
 268 show_fc_fc4s (char *buf, u8 *fc4_list)
 269 {
 270         int i, len=0;
 271
 272         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 273                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 274         len += sprintf(buf + len, "\n");
 275         return len;
 276 }
 277
 278
 279 /* Convert FC_PORT_ROLE bit values to ascii string name */
 280 static const struct {
 281         u32                     value;
 282         char                    *name;
 283 } fc_port_role_names[] = {
 284         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 285         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 286         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 287 };
 288 fc_bitfield_name_search(port_roles, fc_port_role_names)
 289
 290 /*
 291  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 292  */
 293 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 294 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 295 #define FC_FPORT_PORTID                 0x00000e
 296 #define FC_FABCTLR_PORTID               0x00000d
 297 #define FC_DIRSRVR_PORTID               0x00000c
 298 #define FC_TIMESRVR_PORTID              0x00000b
 299 #define FC_MGMTSRVR_PORTID              0x00000a
 300
 301
 302 static void fc_timeout_deleted_rport(struct work_struct *work);
 303 static void fc_timeout_fail_rport_io(struct work_struct *work);
 304 static void fc_scsi_scan_rport(struct work_struct *work);
 305
 306 /*
 307  * Attribute counts pre object type...
 308  * Increase these values if you add attributes
 309  */
 310 #define FC_STARGET_NUM_ATTRS    3
 311 #define FC_RPORT_NUM_ATTRS      10
 312 #define FC_VPORT_NUM_ATTRS      9
 313 #define FC_HOST_NUM_ATTRS       21
 314
 315 struct fc_internal {
 316         struct scsi_transport_template t;
 317         struct fc_function_template *f;
 318
 319         /*
 320          * For attributes : each object has :
 321          *   An array of the actual attributes structures
 322          *   An array of null-terminated pointers to the attribute
 323          *     structures - used for mid-layer interaction.
 324          *
 325          * The attribute containers for the starget and host are are
 326          * part of the midlayer. As the remote port is specific to the
 327          * fc transport, we must provide the attribute container.
 328          */
 329         struct device_attribute private_starget_attrs[
 330                                                         FC_STARGET_NUM_ATTRS];
 331         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 332
 333         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 334         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 335
 336         struct transport_container rport_attr_cont;
 337         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 338         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 339
 340         struct transport_container vport_attr_cont;
 341         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 342         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 343 };
 344
 345 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 346
 347 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 348                            struct device *cdev)
 349 {
 350         struct scsi_target *starget = to_scsi_target(dev);
 351         struct fc_rport *rport = starget_to_rport(starget);
 352
 353         /*
 354          * if parent is remote port, use values from remote port.
 355          * Otherwise, this host uses the fc_transport, but not the
 356          * remote port interface. As such, initialize to known non-values.
 357          */
 358         if (rport) {
 359                 fc_starget_node_name(starget) = rport->node_name;
 360                 fc_starget_port_name(starget) = rport->port_name;
 361                 fc_starget_port_id(starget) = rport->port_id;
 362         } else {
 363                 fc_starget_node_name(starget) = -1;
 364                 fc_starget_port_name(starget) = -1;
 365                 fc_starget_port_id(starget) = -1;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 372                                "fc_transport",
 373                                fc_target_setup,
 374                                NULL,
 375                                NULL);
 376
 377 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 378                          struct device *cdev)
 379 {
 380         struct Scsi_Host *shost = dev_to_shost(dev);
 381         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 382
 383         /*
 384          * Set default values easily detected by the midlayer as
 385          * failure cases.  The scsi lldd is responsible for initializing
 386          * all transport attributes to valid values per host.
 387          */
 388         fc_host->node_name = -1;
 389         fc_host->port_name = -1;
 390         fc_host->permanent_port_name = -1;
 391         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 392         memset(fc_host->supported_fc4s, 0,
 393                 sizeof(fc_host->supported_fc4s));
 394         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 395         fc_host->maxframe_size = -1;
 396         fc_host->max_npiv_vports = 0;
 397         memset(fc_host->serial_number, 0,
 398                 sizeof(fc_host->serial_number));
 399
 400         fc_host->port_id = -1;
 401         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 402         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 403         memset(fc_host->active_fc4s, 0,
 404                 sizeof(fc_host->active_fc4s));
 405         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 406         fc_host->fabric_name = -1;
 407         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 408         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 409
 410         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 411
 412         INIT_LIST_HEAD(&fc_host->rports);
 413         INIT_LIST_HEAD(&fc_host->rport_bindings);
 414         INIT_LIST_HEAD(&fc_host->vports);
 415         fc_host->next_rport_number = 0;
 416         fc_host->next_target_id = 0;
 417         fc_host->next_vport_number = 0;
 418         fc_host->npiv_vports_inuse = 0;
 419
 420         snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
 421                 shost->host_no);
 422         fc_host->work_q = create_singlethread_workqueue(
 423                                         fc_host->work_q_name);
 424         if (!fc_host->work_q)
 425                 return -ENOMEM;
 426
 427         snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
 428                 shost->host_no);
 429         fc_host->devloss_work_q = create_singlethread_workqueue(
 430                                         fc_host->devloss_work_q_name);
 431         if (!fc_host->devloss_work_q) {
 432                 destroy_workqueue(fc_host->work_q);
 433                 fc_host->work_q = NULL;
 434                 return -ENOMEM;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 441                                "fc_host",
 442                                fc_host_setup,
 443                                NULL,
 444                                NULL);
 445
 446 /*
 447  * Setup and Remove actions for remote ports are handled
 448  * in the service functions below.
 449  */
 450 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 451                                "fc_remote_ports",
 452                                NULL,
 453                                NULL,
 454                                NULL);
 455
 456 /*
 457  * Setup and Remove actions for virtual ports are handled
 458  * in the service functions below.
 459  */
 460 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 461                                "fc_vports",
 462                                NULL,
 463                                NULL,
 464                                NULL);
 465
 466 /*
 467  * Module Parameters
 468  */
 469
 470 /*
 471  * dev_loss_tmo: the default number of seconds that the FC transport
 472  *   should insulate the loss of a remote port.
 473  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 474  */
 475 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 476
 477 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 478 MODULE_PARM_DESC(dev_loss_tmo,
 479                  "Maximum number of seconds that the FC transport should"
 480                  " insulate the loss of a remote port. Once this value is"
 481                  " exceeded, the scsi target is removed. Value should be"
 482                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 483
 484 /*
 485  * Netlink Infrastructure
 486  */
 487
 488 static atomic_t fc_event_seq;
 489
 490 /**
 491  * fc_get_event_number - Obtain the next sequential FC event number
 492  *
 493  * Notes:
 494  *   We could have inlined this, but it would have required fc_event_seq to
 495  *   be exposed. For now, live with the subroutine call.
 496  *   Atomic used to avoid lock/unlock...
 497  */
 498 u32
 499 fc_get_event_number(void)
 500 {
 501         return atomic_add_return(1, &fc_event_seq);
 502 }
 503 EXPORT_SYMBOL(fc_get_event_number);
 504
 505
 506 /**
 507  * fc_host_post_event - called to post an even on an fc_host.
 508  * @shost:              host the event occurred on
 509  * @event_number:       fc event number obtained from get_fc_event_number()
 510  * @event_code:         fc_host event being posted
 511  * @event_data:         32bits of data for the event being posted
 512  *
 513  * Notes:
 514  *      This routine assumes no locks are held on entry.
 515  */
 516 void
 517 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 518                 enum fc_host_event_code event_code, u32 event_data)
 519 {
 520         struct sk_buff *skb;
 521         struct nlmsghdr *nlh;
 522         struct fc_nl_event *event;
 523         const char *name;
 524         u32 len, skblen;
 525         int err;
 526
 527         if (!scsi_nl_sock) {
 528                 err = -ENOENT;
 529                 goto send_fail;
 530         }
 531
 532         len = FC_NL_MSGALIGN(sizeof(*event));
 533         skblen = NLMSG_SPACE(len);
 534
 535         skb = alloc_skb(skblen, GFP_KERNEL);
 536         if (!skb) {
 537                 err = -ENOBUFS;
 538                 goto send_fail;
 539         }
 540
 541         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 542                                 skblen - sizeof(*nlh), 0);
 543         if (!nlh) {
 544                 err = -ENOBUFS;
 545                 goto send_fail_skb;
 546         }
 547         event = NLMSG_DATA(nlh);
 548
 549         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 550                                 FC_NL_ASYNC_EVENT, len);
 551         event->seconds = get_seconds();
 552         event->vendor_id = 0;
 553         event->host_no = shost->host_no;
 554         event->event_datalen = sizeof(u32);     /* bytes */
 555         event->event_num = event_number;
 556         event->event_code = event_code;
 557         event->event_data = event_data;
 558
 559         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 560                               GFP_KERNEL);
 561         if (err && (err != -ESRCH))     /* filter no recipient errors */
 562                 /* nlmsg_multicast already kfree_skb'd */
 563                 goto send_fail;
 564
 565         return;
 566
 567 send_fail_skb:
 568         kfree_skb(skb);
 569 send_fail:
 570         name = get_fc_host_event_code_name(event_code);
 571         printk(KERN_WARNING
 572                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 573                 __FUNCTION__, shost->host_no,
 574                 (name) ? name : "<unknown>", event_data, err);
 575         return;
 576 }
 577 EXPORT_SYMBOL(fc_host_post_event);
 578
 579
 580 /**
 581  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 582  * @shost:              host the event occurred on
 583  * @event_number:       fc event number obtained from get_fc_event_number()
 584  * @data_len:           amount, in bytes, of vendor unique data
 585  * @data_buf:           pointer to vendor unique data
 586  * @vendor_id:          Vendor id
 587  *
 588  * Notes:
 589  *      This routine assumes no locks are held on entry.
 590  */
 591 void
 592 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 593                 u32 data_len, char * data_buf, u64 vendor_id)
 594 {
 595         struct sk_buff *skb;
 596         struct nlmsghdr *nlh;
 597         struct fc_nl_event *event;
 598         u32 len, skblen;
 599         int err;
 600
 601         if (!scsi_nl_sock) {
 602                 err = -ENOENT;
 603                 goto send_vendor_fail;
 604         }
 605
 606         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 607         skblen = NLMSG_SPACE(len);
 608
 609         skb = alloc_skb(skblen, GFP_KERNEL);
 610         if (!skb) {
 611                 err = -ENOBUFS;
 612                 goto send_vendor_fail;
 613         }
 614
 615         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 616                                 skblen - sizeof(*nlh), 0);
 617         if (!nlh) {
 618                 err = -ENOBUFS;
 619                 goto send_vendor_fail_skb;
 620         }
 621         event = NLMSG_DATA(nlh);
 622
 623         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 624                                 FC_NL_ASYNC_EVENT, len);
 625         event->seconds = get_seconds();
 626         event->vendor_id = vendor_id;
 627         event->host_no = shost->host_no;
 628         event->event_datalen = data_len;        /* bytes */
 629         event->event_num = event_number;
 630         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 631         memcpy(&event->event_data, data_buf, data_len);
 632
 633         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 634                               GFP_KERNEL);
 635         if (err && (err != -ESRCH))     /* filter no recipient errors */
 636                 /* nlmsg_multicast already kfree_skb'd */
 637                 goto send_vendor_fail;
 638
 639         return;
 640
 641 send_vendor_fail_skb:
 642         kfree_skb(skb);
 643 send_vendor_fail:
 644         printk(KERN_WARNING
 645                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 646                 __FUNCTION__, shost->host_no, err);
 647         return;
 648 }
 649 EXPORT_SYMBOL(fc_host_post_vendor_event);
 650
 651
 652
 653 static __init int fc_transport_init(void)
 654 {
 655         int error;
 656
 657         atomic_set(&fc_event_seq, 0);
 658
 659         error = transport_class_register(&fc_host_class);
 660         if (error)
 661                 return error;
 662         error = transport_class_register(&fc_vport_class);
 663         if (error)
 664                 return error;
 665         error = transport_class_register(&fc_rport_class);
 666         if (error)
 667                 return error;
 668         return transport_class_register(&fc_transport_class);
 669 }
 670
 671 static void __exit fc_transport_exit(void)
 672 {
 673         transport_class_unregister(&fc_transport_class);
 674         transport_class_unregister(&fc_rport_class);
 675         transport_class_unregister(&fc_host_class);
 676         transport_class_unregister(&fc_vport_class);
 677 }
 678
 679 /*
 680  * FC Remote Port Attribute Management
 681  */
 682
 683 #define fc_rport_show_function(field, format_string, sz, cast)          \
 684 static ssize_t                                                          \
 685 show_fc_rport_##field (struct device *dev,                              \
 686                        struct device_attribute *attr, char *buf)        \
 687 {                                                                       \
 688         struct fc_rport *rport = transport_class_to_rport(dev);         \
 689         struct Scsi_Host *shost = rport_to_shost(rport);                \
 690         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 691         if ((i->f->get_rport_##field) &&                                \
 692             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 693               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 694               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 695                 i->f->get_rport_##field(rport);                         \
 696         return snprintf(buf, sz, format_string, cast rport->field);     \
 697 }
 698
 699 #define fc_rport_store_function(field)                                  \
 700 static ssize_t                                                          \
 701 store_fc_rport_##field(struct device *dev,                              \
 702                        struct device_attribute *attr,                   \
 703                        const char *buf, size_t count)                   \
 704 {                                                                       \
 705         int val;                                                        \
 706         struct fc_rport *rport = transport_class_to_rport(dev);         \
 707         struct Scsi_Host *shost = rport_to_shost(rport);                \
 708         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 709         char *cp;                                                       \
 710         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 711             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 712             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 713                 return -EBUSY;                                          \
 714         val = simple_strtoul(buf, &cp, 0);                              \
 715         if (*cp && (*cp != '\n'))                                       \
 716                 return -EINVAL;                                         \
 717         i->f->set_rport_##field(rport, val);                            \
 718         return count;                                                   \
 719 }
 720
 721 #define fc_rport_rd_attr(field, format_string, sz)                      \
 722         fc_rport_show_function(field, format_string, sz, )              \
 723 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 724                          show_fc_rport_##field, NULL)
 725
 726 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 727         fc_rport_show_function(field, format_string, sz, (cast))        \
 728 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 729                           show_fc_rport_##field, NULL)
 730
 731 #define fc_rport_rw_attr(field, format_string, sz)                      \
 732         fc_rport_show_function(field, format_string, sz, )              \
 733         fc_rport_store_function(field)                                  \
 734 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 735                         show_fc_rport_##field,                          \
 736                         store_fc_rport_##field)
 737
 738
 739 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 740 static ssize_t                                                          \
 741 show_fc_rport_##field (struct device *dev,                              \
 742                        struct device_attribute *attr, char *buf)        \
 743 {                                                                       \
 744         struct fc_rport *rport = transport_class_to_rport(dev);         \
 745         return snprintf(buf, sz, format_string, cast rport->field);     \
 746 }
 747
 748 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 749         fc_private_rport_show_function(field, format_string, sz, )      \
 750 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 751                          show_fc_rport_##field, NULL)
 752
 753 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 754         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 755 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 756                           show_fc_rport_##field, NULL)
 757
 758
 759 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 760 static ssize_t                                                          \
 761 show_fc_rport_##title (struct device *dev,                              \
 762                        struct device_attribute *attr, char *buf)        \
 763 {                                                                       \
 764         struct fc_rport *rport = transport_class_to_rport(dev);         \
 765         const char *name;                                               \
 766         name = get_fc_##title##_name(rport->title);                     \
 767         if (!name)                                                      \
 768                 return -EINVAL;                                         \
 769         return snprintf(buf, maxlen, "%s\n", name);                     \
 770 }                                                                       \
 771 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 772                         show_fc_rport_##title, NULL)
 773
 774
 775 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 776         i->private_rport_attrs[count] = device_attr_rport_##field; \
 777         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 778         i->private_rport_attrs[count].store = NULL;                     \
 779         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 780         if (i->f->show_rport_##field)                                   \
 781                 count++
 782
 783 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 784         i->private_rport_attrs[count] = device_attr_rport_##field; \
 785         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 786         i->private_rport_attrs[count].store = NULL;                     \
 787         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 788         count++
 789
 790 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 791         i->private_rport_attrs[count] = device_attr_rport_##field; \
 792         if (!i->f->set_rport_##field) {                                 \
 793                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 794                 i->private_rport_attrs[count].store = NULL;             \
 795         }                                                               \
 796         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 797         if (i->f->show_rport_##field)                                   \
 798                 count++
 799
 800 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 801 {                                                                       \
 802         i->private_rport_attrs[count] = device_attr_rport_##field; \
 803         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 804         count++;                                                        \
 805 }
 806
 807
 808 /* The FC Transport Remote Port Attributes: */
 809
 810 /* Fixed Remote Port Attributes */
 811
 812 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 813
 814 static ssize_t
 815 show_fc_rport_supported_classes (struct device *dev,
 816                                  struct device_attribute *attr, char *buf)
 817 {
 818         struct fc_rport *rport = transport_class_to_rport(dev);
 819         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 820                 return snprintf(buf, 20, "unspecified\n");
 821         return get_fc_cos_names(rport->supported_classes, buf);
 822 }
 823 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 824                 show_fc_rport_supported_classes, NULL);
 825
 826 /* Dynamic Remote Port Attributes */
 827
 828 /*
 829  * dev_loss_tmo attribute
 830  */
 831 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 832 static ssize_t
 833 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 834                             const char *buf, size_t count)
 835 {
 836         int val;
 837         struct fc_rport *rport = transport_class_to_rport(dev);
 838         struct Scsi_Host *shost = rport_to_shost(rport);
 839         struct fc_internal *i = to_fc_internal(shost->transportt);
 840         char *cp;
 841         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 842             (rport->port_state == FC_PORTSTATE_DELETED) ||
 843             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 844                 return -EBUSY;
 845         val = simple_strtoul(buf, &cp, 0);
 846         if ((*cp && (*cp != '\n')) ||
 847             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 848                 return -EINVAL;
 849         i->f->set_rport_dev_loss_tmo(rport, val);
 850         return count;
 851 }
 852 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 853                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 854
 855
 856 /* Private Remote Port Attributes */
 857
 858 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 859 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 860 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 861
 862 static ssize_t
 863 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 864                      char *buf)
 865 {
 866         struct fc_rport *rport = transport_class_to_rport(dev);
 867
 868         /* identify any roles that are port_id specific */
 869         if ((rport->port_id != -1) &&
 870             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 871                                         FC_WELLKNOWN_PORTID_MASK) {
 872                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 873                 case FC_FPORT_PORTID:
 874                         return snprintf(buf, 30, "Fabric Port\n");
 875                 case FC_FABCTLR_PORTID:
 876                         return snprintf(buf, 30, "Fabric Controller\n");
 877                 case FC_DIRSRVR_PORTID:
 878                         return snprintf(buf, 30, "Directory Server\n");
 879                 case FC_TIMESRVR_PORTID:
 880                         return snprintf(buf, 30, "Time Server\n");
 881                 case FC_MGMTSRVR_PORTID:
 882                         return snprintf(buf, 30, "Management Server\n");
 883                 default:
 884                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 885                 }
 886         } else {
 887                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 888                         return snprintf(buf, 20, "unknown\n");
 889                 return get_fc_port_roles_names(rport->roles, buf);
 890         }
 891 }
 892 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 893                 show_fc_rport_roles, NULL);
 894
 895 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 896 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 897
 898 /*
 899  * fast_io_fail_tmo attribute
 900  */
 901 static ssize_t
 902 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 903                                 struct device_attribute *attr, char *buf)
 904 {
 905         struct fc_rport *rport = transport_class_to_rport(dev);
 906
 907         if (rport->fast_io_fail_tmo == -1)
 908                 return snprintf(buf, 5, "off\n");
 909         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 910 }
 911
 912 static ssize_t
 913 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 914                                 struct device_attribute *attr, const char *buf,
 915                                 size_t count)
 916 {
 917         int val;
 918         char *cp;
 919         struct fc_rport *rport = transport_class_to_rport(dev);
 920
 921         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 922             (rport->port_state == FC_PORTSTATE_DELETED) ||
 923             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 924                 return -EBUSY;
 925         if (strncmp(buf, "off", 3) == 0)
 926                 rport->fast_io_fail_tmo = -1;
 927         else {
 928                 val = simple_strtoul(buf, &cp, 0);
 929                 if ((*cp && (*cp != '\n')) ||
 930                     (val < 0) || (val >= rport->dev_loss_tmo))
 931                         return -EINVAL;
 932                 rport->fast_io_fail_tmo = val;
 933         }
 934         return count;
 935 }
 936 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 937         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 938
 939
 940 /*
 941  * FC SCSI Target Attribute Management
 942  */
 943
 944 /*
 945  * Note: in the target show function we recognize when the remote
 946  *  port is in the heirarchy and do not allow the driver to get
 947  *  involved in sysfs functions. The driver only gets involved if
 948  *  it's the "old" style that doesn't use rports.
 949  */
 950 #define fc_starget_show_function(field, format_string, sz, cast)        \
 951 static ssize_t                                                          \
 952 show_fc_starget_##field (struct device *dev,                            \
 953                          struct device_attribute *attr, char *buf)      \
 954 {                                                                       \
 955         struct scsi_target *starget = transport_class_to_starget(dev);  \
 956         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 957         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 958         struct fc_rport *rport = starget_to_rport(starget);             \
 959         if (rport)                                                      \
 960                 fc_starget_##field(starget) = rport->field;             \
 961         else if (i->f->get_starget_##field)                             \
 962                 i->f->get_starget_##field(starget);                     \
 963         return snprintf(buf, sz, format_string,                         \
 964                 cast fc_starget_##field(starget));                      \
 965 }
 966
 967 #define fc_starget_rd_attr(field, format_string, sz)                    \
 968         fc_starget_show_function(field, format_string, sz, )            \
 969 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 970                          show_fc_starget_##field, NULL)
 971
 972 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 973         fc_starget_show_function(field, format_string, sz, (cast))      \
 974 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 975                           show_fc_starget_##field, NULL)
 976
 977 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 978         i->private_starget_attrs[count] = device_attr_starget_##field; \
 979         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 980         i->private_starget_attrs[count].store = NULL;                   \
 981         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 982         if (i->f->show_starget_##field)                                 \
 983                 count++
 984
 985 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 986         i->private_starget_attrs[count] = device_attr_starget_##field; \
 987         if (!i->f->set_starget_##field) {                               \
 988                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 989                 i->private_starget_attrs[count].store = NULL;           \
 990         }                                                               \
 991         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 992         if (i->f->show_starget_##field)                                 \
 993                 count++
 994
 995 /* The FC Transport SCSI Target Attributes: */
 996 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 997 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 998 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 999
1000
1001 /*
1002  * FC Virtual Port Attribute Management
1003  */
1004
1005 #define fc_vport_show_function(field, format_string, sz, cast)          \
1006 static ssize_t                                                          \
1007 show_fc_vport_##field (struct device *dev,                              \
1008                        struct device_attribute *attr, char *buf)        \
1009 {                                                                       \
1010         struct fc_vport *vport = transport_class_to_vport(dev);         \
1011         struct Scsi_Host *shost = vport_to_shost(vport);                \
1012         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1013         if ((i->f->get_vport_##field) &&                                \
1014             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1015                 i->f->get_vport_##field(vport);                         \
1016         return snprintf(buf, sz, format_string, cast vport->field);     \
1017 }
1018
1019 #define fc_vport_store_function(field)                                  \
1020 static ssize_t                                                          \
1021 store_fc_vport_##field(struct device *dev,                              \
1022                        struct device_attribute *attr,                   \
1023                        const char *buf, size_t count)                   \
1024 {                                                                       \
1025         int val;                                                        \
1026         struct fc_vport *vport = transport_class_to_vport(dev);         \
1027         struct Scsi_Host *shost = vport_to_shost(vport);                \
1028         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1029         char *cp;                                                       \
1030         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1031                 return -EBUSY;                                          \
1032         val = simple_strtoul(buf, &cp, 0);                              \
1033         if (*cp && (*cp != '\n'))                                       \
1034                 return -EINVAL;                                         \
1035         i->f->set_vport_##field(vport, val);                            \
1036         return count;                                                   \
1037 }
1038
1039 #define fc_vport_store_str_function(field, slen)                        \
1040 static ssize_t                                                          \
1041 store_fc_vport_##field(struct device *dev,                              \
1042                        struct device_attribute *attr,                   \
1043                        const char *buf, size_t count)                   \
1044 {                                                                       \
1045         struct fc_vport *vport = transport_class_to_vport(dev);         \
1046         struct Scsi_Host *shost = vport_to_shost(vport);                \
1047         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1048         unsigned int cnt=count;                                         \
1049                                                                         \
1050         /* count may include a LF at end of string */                   \
1051         if (buf[cnt-1] == '\n')                                         \
1052                 cnt--;                                                  \
1053         if (cnt > ((slen) - 1))                                         \
1054                 return -EINVAL;                                         \
1055         memcpy(vport->field, buf, cnt);                                 \
1056         i->f->set_vport_##field(vport);                                 \
1057         return count;                                                   \
1058 }
1059
1060 #define fc_vport_rd_attr(field, format_string, sz)                      \
1061         fc_vport_show_function(field, format_string, sz, )              \
1062 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1063                          show_fc_vport_##field, NULL)
1064
1065 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1066         fc_vport_show_function(field, format_string, sz, (cast))        \
1067 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1068                           show_fc_vport_##field, NULL)
1069
1070 #define fc_vport_rw_attr(field, format_string, sz)                      \
1071         fc_vport_show_function(field, format_string, sz, )              \
1072         fc_vport_store_function(field)                                  \
1073 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1074                         show_fc_vport_##field,                          \
1075                         store_fc_vport_##field)
1076
1077 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1078 static ssize_t                                                          \
1079 show_fc_vport_##field (struct device *dev,                              \
1080                        struct device_attribute *attr, char *buf)        \
1081 {                                                                       \
1082         struct fc_vport *vport = transport_class_to_vport(dev);         \
1083         return snprintf(buf, sz, format_string, cast vport->field);     \
1084 }
1085
1086 #define fc_private_vport_store_u32_function(field)                      \
1087 static ssize_t                                                          \
1088 store_fc_vport_##field(struct device *dev,                              \
1089                        struct device_attribute *attr,                   \
1090                        const char *buf, size_t count)                   \
1091 {                                                                       \
1092         u32 val;                                                        \
1093         struct fc_vport *vport = transport_class_to_vport(dev);         \
1094         char *cp;                                                       \
1095         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1096                 return -EBUSY;                                          \
1097         val = simple_strtoul(buf, &cp, 0);                              \
1098         if (*cp && (*cp != '\n'))                                       \
1099                 return -EINVAL;                                         \
1100         vport->field = val;                                             \
1101         return count;                                                   \
1102 }
1103
1104
1105 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1106         fc_private_vport_show_function(field, format_string, sz, )      \
1107 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1108                          show_fc_vport_##field, NULL)
1109
1110 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1111         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1112 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1113                           show_fc_vport_##field, NULL)
1114
1115 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1116         fc_private_vport_show_function(field, format_string, sz, )      \
1117         fc_private_vport_store_u32_function(field)                      \
1118 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1119                         show_fc_vport_##field,                          \
1120                         store_fc_vport_##field)
1121
1122
1123 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1124 static ssize_t                                                          \
1125 show_fc_vport_##title (struct device *dev,                              \
1126                        struct device_attribute *attr,                   \
1127                        char *buf)                                       \
1128 {                                                                       \
1129         struct fc_vport *vport = transport_class_to_vport(dev);         \
1130         const char *name;                                               \
1131         name = get_fc_##title##_name(vport->title);                     \
1132         if (!name)                                                      \
1133                 return -EINVAL;                                         \
1134         return snprintf(buf, maxlen, "%s\n", name);                     \
1135 }                                                                       \
1136 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1137                         show_fc_vport_##title, NULL)
1138
1139
1140 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1141         i->private_vport_attrs[count] = device_attr_vport_##field; \
1142         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1143         i->private_vport_attrs[count].store = NULL;                     \
1144         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1145         if (i->f->get_##field)                                          \
1146                 count++
1147         /* NOTE: Above MACRO differs: checks function not show bit */
1148
1149 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1150         i->private_vport_attrs[count] = device_attr_vport_##field; \
1151         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1152         i->private_vport_attrs[count].store = NULL;                     \
1153         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1154         count++
1155
1156 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1157         i->private_vport_attrs[count] = device_attr_vport_##field; \
1158         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1159         if (i->f->field)                                                \
1160                 count++
1161         /* NOTE: Above MACRO differs: checks function */
1162
1163 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1164         i->private_vport_attrs[count] = device_attr_vport_##field; \
1165         if (!i->f->set_vport_##field) {                                 \
1166                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1167                 i->private_vport_attrs[count].store = NULL;             \
1168         }                                                               \
1169         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1170         count++
1171         /* NOTE: Above MACRO differs: does not check show bit */
1172
1173 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1174 {                                                                       \
1175         i->private_vport_attrs[count] = device_attr_vport_##field; \
1176         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1177         count++;                                                        \
1178 }
1179
1180
1181 /* The FC Transport Virtual Port Attributes: */
1182
1183 /* Fixed Virtual Port Attributes */
1184
1185 /* Dynamic Virtual Port Attributes */
1186
1187 /* Private Virtual Port Attributes */
1188
1189 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1190 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1191 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1192 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1193
1194 static ssize_t
1195 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1196                      char *buf)
1197 {
1198         struct fc_vport *vport = transport_class_to_vport(dev);
1199
1200         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1201                 return snprintf(buf, 20, "unknown\n");
1202         return get_fc_port_roles_names(vport->roles, buf);
1203 }
1204 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1205
1206 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1207
1208 fc_private_vport_show_function(symbolic_name, "%s\n",
1209                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1210 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1211 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1212                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1213
1214 static ssize_t
1215 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1216                       const char *buf, size_t count)
1217 {
1218         struct fc_vport *vport = transport_class_to_vport(dev);
1219         struct Scsi_Host *shost = vport_to_shost(vport);
1220
1221         fc_queue_work(shost, &vport->vport_delete_work);
1222         return count;
1223 }
1224 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1225                         NULL, store_fc_vport_delete);
1226
1227
1228 /*
1229  * Enable/Disable vport
1230  *  Write "1" to disable, write "0" to enable
1231  */
1232 static ssize_t
1233 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1234                        const char *buf,
1235                            size_t count)
1236 {
1237         struct fc_vport *vport = transport_class_to_vport(dev);
1238         struct Scsi_Host *shost = vport_to_shost(vport);
1239         struct fc_internal *i = to_fc_internal(shost->transportt);
1240         int stat;
1241
1242         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1243                 return -EBUSY;
1244
1245         if (*buf == '0') {
1246                 if (vport->vport_state != FC_VPORT_DISABLED)
1247                         return -EALREADY;
1248         } else if (*buf == '1') {
1249                 if (vport->vport_state == FC_VPORT_DISABLED)
1250                         return -EALREADY;
1251         } else
1252                 return -EINVAL;
1253
1254         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1255         return stat ? stat : count;
1256 }
1257 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1258                         NULL, store_fc_vport_disable);
1259
1260
1261 /*
1262  * Host Attribute Management
1263  */
1264
1265 #define fc_host_show_function(field, format_string, sz, cast)           \
1266 static ssize_t                                                          \
1267 show_fc_host_##field (struct device *dev,                               \
1268                       struct device_attribute *attr, char *buf)         \
1269 {                                                                       \
1270         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1271         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1272         if (i->f->get_host_##field)                                     \
1273                 i->f->get_host_##field(shost);                          \
1274         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1275 }
1276
1277 #define fc_host_store_function(field)                                   \
1278 static ssize_t                                                          \
1279 store_fc_host_##field(struct device *dev,                               \
1280                       struct device_attribute *attr,                    \
1281                       const char *buf,  size_t count)                   \
1282 {                                                                       \
1283         int val;                                                        \
1284         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1285         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1286         char *cp;                                                       \
1287                                                                         \
1288         val = simple_strtoul(buf, &cp, 0);                              \
1289         if (*cp && (*cp != '\n'))                                       \
1290                 return -EINVAL;                                         \
1291         i->f->set_host_##field(shost, val);                             \
1292         return count;                                                   \
1293 }
1294
1295 #define fc_host_store_str_function(field, slen)                         \
1296 static ssize_t                                                          \
1297 store_fc_host_##field(struct device *dev,                               \
1298                       struct device_attribute *attr,                    \
1299                       const char *buf, size_t count)                    \
1300 {                                                                       \
1301         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1302         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1303         unsigned int cnt=count;                                         \
1304                                                                         \
1305         /* count may include a LF at end of string */                   \
1306         if (buf[cnt-1] == '\n')                                         \
1307                 cnt--;                                                  \
1308         if (cnt > ((slen) - 1))                                         \
1309                 return -EINVAL;                                         \
1310         memcpy(fc_host_##field(shost), buf, cnt);                       \
1311         i->f->set_host_##field(shost);                                  \
1312         return count;                                                   \
1313 }
1314
1315 #define fc_host_rd_attr(field, format_string, sz)                       \
1316         fc_host_show_function(field, format_string, sz, )               \
1317 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1318                          show_fc_host_##field, NULL)
1319
1320 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1321         fc_host_show_function(field, format_string, sz, (cast))         \
1322 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1323                           show_fc_host_##field, NULL)
1324
1325 #define fc_host_rw_attr(field, format_string, sz)                       \
1326         fc_host_show_function(field, format_string, sz, )               \
1327         fc_host_store_function(field)                                   \
1328 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1329                         show_fc_host_##field,                           \
1330                         store_fc_host_##field)
1331
1332 #define fc_host_rd_enum_attr(title, maxlen)                             \
1333 static ssize_t                                                          \
1334 show_fc_host_##title (struct device *dev,                               \
1335                       struct device_attribute *attr, char *buf)         \
1336 {                                                                       \
1337         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1338         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1339         const char *name;                                               \
1340         if (i->f->get_host_##title)                                     \
1341                 i->f->get_host_##title(shost);                          \
1342         name = get_fc_##title##_name(fc_host_##title(shost));           \
1343         if (!name)                                                      \
1344                 return -EINVAL;                                         \
1345         return snprintf(buf, maxlen, "%s\n", name);                     \
1346 }                                                                       \
1347 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1348
1349 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1350         i->private_host_attrs[count] = device_attr_host_##field;        \
1351         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1352         i->private_host_attrs[count].store = NULL;                      \
1353         i->host_attrs[count] = &i->private_host_attrs[count];           \
1354         if (i->f->show_host_##field)                                    \
1355                 count++
1356
1357 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1358         i->private_host_attrs[count] = device_attr_host_##field;        \
1359         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1360         i->private_host_attrs[count].store = NULL;                      \
1361         i->host_attrs[count] = &i->private_host_attrs[count];           \
1362         count++
1363
1364 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1365         i->private_host_attrs[count] = device_attr_host_##field;        \
1366         if (!i->f->set_host_##field) {                                  \
1367                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1368                 i->private_host_attrs[count].store = NULL;              \
1369         }                                                               \
1370         i->host_attrs[count] = &i->private_host_attrs[count];           \
1371         if (i->f->show_host_##field)                                    \
1372                 count++
1373
1374
1375 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1376 static ssize_t                                                          \
1377 show_fc_host_##field (struct device *dev,                               \
1378                       struct device_attribute *attr, char *buf)         \
1379 {                                                                       \
1380         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1381         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1382 }
1383
1384 #define fc_private_host_rd_attr(field, format_string, sz)               \
1385         fc_private_host_show_function(field, format_string, sz, )       \
1386 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1387                          show_fc_host_##field, NULL)
1388
1389 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1390         fc_private_host_show_function(field, format_string, sz, (cast)) \
1391 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1392                           show_fc_host_##field, NULL)
1393
1394 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1395         i->private_host_attrs[count] = device_attr_host_##field;        \
1396         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1397         i->private_host_attrs[count].store = NULL;                      \
1398         i->host_attrs[count] = &i->private_host_attrs[count];           \
1399         count++
1400
1401 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1402 {                                                                       \
1403         i->private_host_attrs[count] = device_attr_host_##field;        \
1404         i->host_attrs[count] = &i->private_host_attrs[count];           \
1405         count++;                                                        \
1406 }
1407
1408
1409 /* Fixed Host Attributes */
1410
1411 static ssize_t
1412 show_fc_host_supported_classes (struct device *dev,
1413                                 struct device_attribute *attr, char *buf)
1414 {
1415         struct Scsi_Host *shost = transport_class_to_shost(dev);
1416
1417         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1418                 return snprintf(buf, 20, "unspecified\n");
1419
1420         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1421 }
1422 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1423                 show_fc_host_supported_classes, NULL);
1424
1425 static ssize_t
1426 show_fc_host_supported_fc4s (struct device *dev,
1427                              struct device_attribute *attr, char *buf)
1428 {
1429         struct Scsi_Host *shost = transport_class_to_shost(dev);
1430         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1431 }
1432 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1433                 show_fc_host_supported_fc4s, NULL);
1434
1435 static ssize_t
1436 show_fc_host_supported_speeds (struct device *dev,
1437                                struct device_attribute *attr, char *buf)
1438 {
1439         struct Scsi_Host *shost = transport_class_to_shost(dev);
1440
1441         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1442                 return snprintf(buf, 20, "unknown\n");
1443
1444         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1445 }
1446 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1447                 show_fc_host_supported_speeds, NULL);
1448
1449
1450 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1451 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1452 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1453                              unsigned long long);
1454 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1455 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1456 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1457
1458
1459 /* Dynamic Host Attributes */
1460
1461 static ssize_t
1462 show_fc_host_active_fc4s (struct device *dev,
1463                           struct device_attribute *attr, char *buf)
1464 {
1465         struct Scsi_Host *shost = transport_class_to_shost(dev);
1466         struct fc_internal *i = to_fc_internal(shost->transportt);
1467
1468         if (i->f->get_host_active_fc4s)
1469                 i->f->get_host_active_fc4s(shost);
1470
1471         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1472 }
1473 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1474                 show_fc_host_active_fc4s, NULL);
1475
1476 static ssize_t
1477 show_fc_host_speed (struct device *dev,
1478                     struct device_attribute *attr, char *buf)
1479 {
1480         struct Scsi_Host *shost = transport_class_to_shost(dev);
1481         struct fc_internal *i = to_fc_internal(shost->transportt);
1482
1483         if (i->f->get_host_speed)
1484                 i->f->get_host_speed(shost);
1485
1486         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1487                 return snprintf(buf, 20, "unknown\n");
1488
1489         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1490 }
1491 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1492                 show_fc_host_speed, NULL);
1493
1494
1495 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1496 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1497 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1498 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1499 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1500
1501 fc_private_host_show_function(system_hostname, "%s\n",
1502                 FC_SYMBOLIC_NAME_SIZE + 1, )
1503 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1504 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1505                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1506
1507
1508 /* Private Host Attributes */
1509
1510 static ssize_t
1511 show_fc_private_host_tgtid_bind_type(struct device *dev,
1512                                      struct device_attribute *attr, char *buf)
1513 {
1514         struct Scsi_Host *shost = transport_class_to_shost(dev);
1515         const char *name;
1516
1517         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1518         if (!name)
1519                 return -EINVAL;
1520         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1521 }
1522
1523 #define get_list_head_entry(pos, head, member)          \
1524         pos = list_entry((head)->next, typeof(*pos), member)
1525
1526 static ssize_t
1527 store_fc_private_host_tgtid_bind_type(struct device *dev,
1528         struct device_attribute *attr, const char *buf, size_t count)
1529 {
1530         struct Scsi_Host *shost = transport_class_to_shost(dev);
1531         struct fc_rport *rport;
1532         enum fc_tgtid_binding_type val;
1533         unsigned long flags;
1534
1535         if (get_fc_tgtid_bind_type_match(buf, &val))
1536                 return -EINVAL;
1537
1538         /* if changing bind type, purge all unused consistent bindings */
1539         if (val != fc_host_tgtid_bind_type(shost)) {
1540                 spin_lock_irqsave(shost->host_lock, flags);
1541                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1542                         get_list_head_entry(rport,
1543                                 &fc_host_rport_bindings(shost), peers);
1544                         list_del(&rport->peers);
1545                         rport->port_state = FC_PORTSTATE_DELETED;
1546                         fc_queue_work(shost, &rport->rport_delete_work);
1547                 }
1548                 spin_unlock_irqrestore(shost->host_lock, flags);
1549         }
1550
1551         fc_host_tgtid_bind_type(shost) = val;
1552         return count;
1553 }
1554
1555 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1556                         show_fc_private_host_tgtid_bind_type,
1557                         store_fc_private_host_tgtid_bind_type);
1558
1559 static ssize_t
1560 store_fc_private_host_issue_lip(struct device *dev,
1561         struct device_attribute *attr, const char *buf, size_t count)
1562 {
1563         struct Scsi_Host *shost = transport_class_to_shost(dev);
1564         struct fc_internal *i = to_fc_internal(shost->transportt);
1565         int ret;
1566
1567         /* ignore any data value written to the attribute */
1568         if (i->f->issue_fc_host_lip) {
1569                 ret = i->f->issue_fc_host_lip(shost);
1570                 return ret ? ret: count;
1571         }
1572
1573         return -ENOENT;
1574 }
1575
1576 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1577                         store_fc_private_host_issue_lip);
1578
1579 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1580
1581
1582 /*
1583  * Host Statistics Management
1584  */
1585
1586 /* Show a given an attribute in the statistics group */
1587 static ssize_t
1588 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1589 {
1590         struct Scsi_Host *shost = transport_class_to_shost(dev);
1591         struct fc_internal *i = to_fc_internal(shost->transportt);
1592         struct fc_host_statistics *stats;
1593         ssize_t ret = -ENOENT;
1594
1595         if (offset > sizeof(struct fc_host_statistics) ||
1596             offset % sizeof(u64) != 0)
1597                 WARN_ON(1);
1598
1599         if (i->f->get_fc_host_stats) {
1600                 stats = (i->f->get_fc_host_stats)(shost);
1601                 if (stats)
1602                         ret = snprintf(buf, 20, "0x%llx\n",
1603                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1604         }
1605         return ret;
1606 }
1607
1608
1609 /* generate a read-only statistics attribute */
1610 #define fc_host_statistic(name)                                         \
1611 static ssize_t show_fcstat_##name(struct device *cd,                    \
1612                                   struct device_attribute *attr,        \
1613                                   char *buf)                            \
1614 {                                                                       \
1615         return fc_stat_show(cd, buf,                                    \
1616                             offsetof(struct fc_host_statistics, name)); \
1617 }                                                                       \
1618 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1619
1620 fc_host_statistic(seconds_since_last_reset);
1621 fc_host_statistic(tx_frames);
1622 fc_host_statistic(tx_words);
1623 fc_host_statistic(rx_frames);
1624 fc_host_statistic(rx_words);
1625 fc_host_statistic(lip_count);
1626 fc_host_statistic(nos_count);
1627 fc_host_statistic(error_frames);
1628 fc_host_statistic(dumped_frames);
1629 fc_host_statistic(link_failure_count);
1630 fc_host_statistic(loss_of_sync_count);
1631 fc_host_statistic(loss_of_signal_count);
1632 fc_host_statistic(prim_seq_protocol_err_count);
1633 fc_host_statistic(invalid_tx_word_count);
1634 fc_host_statistic(invalid_crc_count);
1635 fc_host_statistic(fcp_input_requests);
1636 fc_host_statistic(fcp_output_requests);
1637 fc_host_statistic(fcp_control_requests);
1638 fc_host_statistic(fcp_input_megabytes);
1639 fc_host_statistic(fcp_output_megabytes);
1640
1641 static ssize_t
1642 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1643                     const char *buf, size_t count)
1644 {
1645         struct Scsi_Host *shost = transport_class_to_shost(dev);
1646         struct fc_internal *i = to_fc_internal(shost->transportt);
1647
1648         /* ignore any data value written to the attribute */
1649         if (i->f->reset_fc_host_stats) {
1650                 i->f->reset_fc_host_stats(shost);
1651                 return count;
1652         }
1653
1654         return -ENOENT;
1655 }
1656 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1657                                 fc_reset_statistics);
1658
1659 static struct attribute *fc_statistics_attrs[] = {
1660         &device_attr_host_seconds_since_last_reset.attr,
1661         &device_attr_host_tx_frames.attr,
1662         &device_attr_host_tx_words.attr,
1663         &device_attr_host_rx_frames.attr,
1664         &device_attr_host_rx_words.attr,
1665         &device_attr_host_lip_count.attr,
1666         &device_attr_host_nos_count.attr,
1667         &device_attr_host_error_frames.attr,
1668         &device_attr_host_dumped_frames.attr,
1669         &device_attr_host_link_failure_count.attr,
1670         &device_attr_host_loss_of_sync_count.attr,
1671         &device_attr_host_loss_of_signal_count.attr,
1672         &device_attr_host_prim_seq_protocol_err_count.attr,
1673         &device_attr_host_invalid_tx_word_count.attr,
1674         &device_attr_host_invalid_crc_count.attr,
1675         &device_attr_host_fcp_input_requests.attr,
1676         &device_attr_host_fcp_output_requests.attr,
1677         &device_attr_host_fcp_control_requests.attr,
1678         &device_attr_host_fcp_input_megabytes.attr,
1679         &device_attr_host_fcp_output_megabytes.attr,
1680         &device_attr_host_reset_statistics.attr,
1681         NULL
1682 };
1683
1684 static struct attribute_group fc_statistics_group = {
1685         .name = "statistics",
1686         .attrs = fc_statistics_attrs,
1687 };
1688
1689
1690 /* Host Vport Attributes */
1691
1692 static int
1693 fc_parse_wwn(const char *ns, u64 *nm)
1694 {
1695         unsigned int i, j;
1696         u8 wwn[8];
1697
1698         memset(wwn, 0, sizeof(wwn));
1699
1700         /* Validate and store the new name */
1701         for (i=0, j=0; i < 16; i++) {
1702                 if ((*ns >= 'a') && (*ns <= 'f'))
1703                         j = ((j << 4) | ((*ns++ -'a') + 10));
1704                 else if ((*ns >= 'A') && (*ns <= 'F'))
1705                         j = ((j << 4) | ((*ns++ -'A') + 10));
1706                 else if ((*ns >= '0') && (*ns <= '9'))
1707                         j = ((j << 4) | (*ns++ -'0'));
1708                 else
1709                         return -EINVAL;
1710                 if (i % 2) {
1711                         wwn[i/2] = j & 0xff;
1712                         j = 0;
1713                 }
1714         }
1715
1716         *nm = wwn_to_u64(wwn);
1717
1718         return 0;
1719 }
1720
1721
1722 /*
1723  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1724  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1725  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1726  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1727  */
1728 static ssize_t
1729 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1730                            const char *buf, size_t count)
1731 {
1732         struct Scsi_Host *shost = transport_class_to_shost(dev);
1733         struct fc_vport_identifiers vid;
1734         struct fc_vport *vport;
1735         unsigned int cnt=count;
1736         int stat;
1737
1738         memset(&vid, 0, sizeof(vid));
1739
1740         /* count may include a LF at end of string */
1741         if (buf[cnt-1] == '\n')
1742                 cnt--;
1743
1744         /* validate we have enough characters for WWPN */
1745         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1746                 return -EINVAL;
1747
1748         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1749         if (stat)
1750                 return stat;
1751
1752         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1753         if (stat)
1754                 return stat;
1755
1756         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1757         vid.vport_type = FC_PORTTYPE_NPIV;
1758         /* vid.symbolic_name is already zero/NULL's */
1759         vid.disable = false;            /* always enabled */
1760
1761         /* we only allow support on Channel 0 !!! */
1762         stat = fc_vport_create(shost, 0, &shost->shost_gendev, &vid, &vport);
1763         return stat ? stat : count;
1764 }
1765 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1766                         store_fc_host_vport_create);
1767
1768
1769 /*
1770  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1771  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1772  * The WWNs are specified as hex characters, and may *not* contain
1773  * any prefixes (e.g. 0x, x, etc)
1774  */
1775 static ssize_t
1776 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1777                            const char *buf, size_t count)
1778 {
1779         struct Scsi_Host *shost = transport_class_to_shost(dev);
1780         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1781         struct fc_vport *vport;
1782         u64 wwpn, wwnn;
1783         unsigned long flags;
1784         unsigned int cnt=count;
1785         int stat, match;
1786
1787         /* count may include a LF at end of string */
1788         if (buf[cnt-1] == '\n')
1789                 cnt--;
1790
1791         /* validate we have enough characters for WWPN */
1792         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1793                 return -EINVAL;
1794
1795         stat = fc_parse_wwn(&buf[0], &wwpn);
1796         if (stat)
1797                 return stat;
1798
1799         stat = fc_parse_wwn(&buf[17], &wwnn);
1800         if (stat)
1801                 return stat;
1802
1803         spin_lock_irqsave(shost->host_lock, flags);
1804         match = 0;
1805         /* we only allow support on Channel 0 !!! */
1806         list_for_each_entry(vport, &fc_host->vports, peers) {
1807                 if ((vport->channel == 0) &&
1808                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1809                         match = 1;
1810                         break;
1811                 }
1812         }
1813         spin_unlock_irqrestore(shost->host_lock, flags);
1814
1815         if (!match)
1816                 return -ENODEV;
1817
1818         stat = fc_vport_terminate(vport);
1819         return stat ? stat : count;
1820 }
1821 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1822                         store_fc_host_vport_delete);
1823
1824
1825 static int fc_host_match(struct attribute_container *cont,
1826                           struct device *dev)
1827 {
1828         struct Scsi_Host *shost;
1829         struct fc_internal *i;
1830
1831         if (!scsi_is_host_device(dev))
1832                 return 0;
1833
1834         shost = dev_to_shost(dev);
1835         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1836             != &fc_host_class.class)
1837                 return 0;
1838
1839         i = to_fc_internal(shost->transportt);
1840
1841         return &i->t.host_attrs.ac == cont;
1842 }
1843
1844 static int fc_target_match(struct attribute_container *cont,
1845                             struct device *dev)
1846 {
1847         struct Scsi_Host *shost;
1848         struct fc_internal *i;
1849
1850         if (!scsi_is_target_device(dev))
1851                 return 0;
1852
1853         shost = dev_to_shost(dev->parent);
1854         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1855             != &fc_host_class.class)
1856                 return 0;
1857
1858         i = to_fc_internal(shost->transportt);
1859
1860         return &i->t.target_attrs.ac == cont;
1861 }
1862
1863 static void fc_rport_dev_release(struct device *dev)
1864 {
1865         struct fc_rport *rport = dev_to_rport(dev);
1866         put_device(dev->parent);
1867         kfree(rport);
1868 }
1869
1870 int scsi_is_fc_rport(const struct device *dev)
1871 {
1872         return dev->release == fc_rport_dev_release;
1873 }
1874 EXPORT_SYMBOL(scsi_is_fc_rport);
1875
1876 static int fc_rport_match(struct attribute_container *cont,
1877                             struct device *dev)
1878 {
1879         struct Scsi_Host *shost;
1880         struct fc_internal *i;
1881
1882         if (!scsi_is_fc_rport(dev))
1883                 return 0;
1884
1885         shost = dev_to_shost(dev->parent);
1886         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1887             != &fc_host_class.class)
1888                 return 0;
1889
1890         i = to_fc_internal(shost->transportt);
1891
1892         return &i->rport_attr_cont.ac == cont;
1893 }
1894
1895
1896 static void fc_vport_dev_release(struct device *dev)
1897 {
1898         struct fc_vport *vport = dev_to_vport(dev);
1899         put_device(dev->parent);                /* release kobj parent */
1900         kfree(vport);
1901 }
1902
1903 int scsi_is_fc_vport(const struct device *dev)
1904 {
1905         return dev->release == fc_vport_dev_release;
1906 }
1907 EXPORT_SYMBOL(scsi_is_fc_vport);
1908
1909 static int fc_vport_match(struct attribute_container *cont,
1910                             struct device *dev)
1911 {
1912         struct fc_vport *vport;
1913         struct Scsi_Host *shost;
1914         struct fc_internal *i;
1915
1916         if (!scsi_is_fc_vport(dev))
1917                 return 0;
1918         vport = dev_to_vport(dev);
1919
1920         shost = vport_to_shost(vport);
1921         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1922             != &fc_host_class.class)
1923                 return 0;
1924
1925         i = to_fc_internal(shost->transportt);
1926         return &i->vport_attr_cont.ac == cont;
1927 }
1928
1929
1930 /**
1931  * fc_timed_out - FC Transport I/O timeout intercept handler
1932  * @scmd:       The SCSI command which timed out
1933  *
1934  * This routine protects against error handlers getting invoked while a
1935  * rport is in a blocked state, typically due to a temporarily loss of
1936  * connectivity. If the error handlers are allowed to proceed, requests
1937  * to abort i/o, reset the target, etc will likely fail as there is no way
1938  * to communicate with the device to perform the requested function. These
1939  * failures may result in the midlayer taking the device offline, requiring
1940  * manual intervention to restore operation.
1941  *
1942  * This routine, called whenever an i/o times out, validates the state of
1943  * the underlying rport. If the rport is blocked, it returns
1944  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1945  * Eventually, either the device will return, or devloss_tmo will fire,
1946  * and when the timeout then fires, it will be handled normally.
1947  * If the rport is not blocked, normal error handling continues.
1948  *
1949  * Notes:
1950  *      This routine assumes no locks are held on entry.
1951  */
1952 static enum scsi_eh_timer_return
1953 fc_timed_out(struct scsi_cmnd *scmd)
1954 {
1955         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1956
1957         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1958                 return EH_RESET_TIMER;
1959
1960         return EH_NOT_HANDLED;
1961 }
1962
1963 /*
1964  * Called by fc_user_scan to locate an rport on the shost that
1965  * matches the channel and target id, and invoke scsi_scan_target()
1966  * on the rport.
1967  */
1968 static void
1969 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1970 {
1971         struct fc_rport *rport;
1972         unsigned long flags;
1973
1974         spin_lock_irqsave(shost->host_lock, flags);
1975
1976         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1977                 if (rport->scsi_target_id == -1)
1978                         continue;
1979
1980                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1981                         continue;
1982
1983                 if ((channel == rport->channel) &&
1984                     (id == rport->scsi_target_id)) {
1985                         spin_unlock_irqrestore(shost->host_lock, flags);
1986                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
1987                         return;
1988                 }
1989         }
1990
1991         spin_unlock_irqrestore(shost->host_lock, flags);
1992 }
1993
1994 /*
1995  * Called via sysfs scan routines. Necessary, as the FC transport
1996  * wants to place all target objects below the rport object. So this
1997  * routine must invoke the scsi_scan_target() routine with the rport
1998  * object as the parent.
1999  */
2000 static int
2001 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2002 {
2003         uint chlo, chhi;
2004         uint tgtlo, tgthi;
2005
2006         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2007             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2008             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2009                 return -EINVAL;
2010
2011         if (channel == SCAN_WILD_CARD) {
2012                 chlo = 0;
2013                 chhi = shost->max_channel + 1;
2014         } else {
2015                 chlo = channel;
2016                 chhi = channel + 1;
2017         }
2018
2019         if (id == SCAN_WILD_CARD) {
2020                 tgtlo = 0;
2021                 tgthi = shost->max_id;
2022         } else {
2023                 tgtlo = id;
2024                 tgthi = id + 1;
2025         }
2026
2027         for ( ; chlo < chhi; chlo++)
2028                 for ( ; tgtlo < tgthi; tgtlo++)
2029                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2030
2031         return 0;
2032 }
2033
2034 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2035                                 int result)
2036 {
2037         struct fc_internal *i = to_fc_internal(shost->transportt);
2038         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2039 }
2040
2041 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2042 {
2043         struct fc_internal *i = to_fc_internal(shost->transportt);
2044         return i->f->it_nexus_response(shost, nexus, result);
2045 }
2046
2047 struct scsi_transport_template *
2048 fc_attach_transport(struct fc_function_template *ft)
2049 {
2050         int count;
2051         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2052                                         GFP_KERNEL);
2053
2054         if (unlikely(!i))
2055                 return NULL;
2056
2057         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2058         i->t.target_attrs.ac.class = &fc_transport_class.class;
2059         i->t.target_attrs.ac.match = fc_target_match;
2060         i->t.target_size = sizeof(struct fc_starget_attrs);
2061         transport_container_register(&i->t.target_attrs);
2062
2063         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2064         i->t.host_attrs.ac.class = &fc_host_class.class;
2065         i->t.host_attrs.ac.match = fc_host_match;
2066         i->t.host_size = sizeof(struct fc_host_attrs);
2067         if (ft->get_fc_host_stats)
2068                 i->t.host_attrs.statistics = &fc_statistics_group;
2069         transport_container_register(&i->t.host_attrs);
2070
2071         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2072         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2073         i->rport_attr_cont.ac.match = fc_rport_match;
2074         transport_container_register(&i->rport_attr_cont);
2075
2076         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2077         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2078         i->vport_attr_cont.ac.match = fc_vport_match;
2079         transport_container_register(&i->vport_attr_cont);
2080
2081         i->f = ft;
2082
2083         /* Transport uses the shost workq for scsi scanning */
2084         i->t.create_work_queue = 1;
2085
2086         i->t.eh_timed_out = fc_timed_out;
2087
2088         i->t.user_scan = fc_user_scan;
2089
2090         /* target-mode drivers' functions */
2091         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2092         i->t.it_nexus_response = fc_it_nexus_response;
2093
2094         /*
2095          * Setup SCSI Target Attributes.
2096          */
2097         count = 0;
2098         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2099         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2100         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2101
2102         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2103
2104         i->starget_attrs[count] = NULL;
2105
2106
2107         /*
2108          * Setup SCSI Host Attributes.
2109          */
2110         count=0;
2111         SETUP_HOST_ATTRIBUTE_RD(node_name);
2112         SETUP_HOST_ATTRIBUTE_RD(port_name);
2113         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2114         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2115         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2116         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2117         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2118         if (ft->vport_create) {
2119                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2120                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2121         }
2122         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2123
2124         SETUP_HOST_ATTRIBUTE_RD(port_id);
2125         SETUP_HOST_ATTRIBUTE_RD(port_type);
2126         SETUP_HOST_ATTRIBUTE_RD(port_state);
2127         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2128         SETUP_HOST_ATTRIBUTE_RD(speed);
2129         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2130         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2131         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2132
2133         /* Transport-managed attributes */
2134         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2135         if (ft->issue_fc_host_lip)
2136                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2137         if (ft->vport_create)
2138                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2139         if (ft->vport_delete)
2140                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2141
2142         BUG_ON(count > FC_HOST_NUM_ATTRS);
2143
2144         i->host_attrs[count] = NULL;
2145
2146         /*
2147          * Setup Remote Port Attributes.
2148          */
2149         count=0;
2150         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2151         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2152         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2153         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2154         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2155         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2156         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2157         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2158         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2159         if (ft->terminate_rport_io)
2160                 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2161
2162         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2163
2164         i->rport_attrs[count] = NULL;
2165
2166         /*
2167          * Setup Virtual Port Attributes.
2168          */
2169         count=0;
2170         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2171         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2172         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2173         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2174         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2175         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2176         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2177         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2178         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2179
2180         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2181
2182         i->vport_attrs[count] = NULL;
2183
2184         return &i->t;
2185 }
2186 EXPORT_SYMBOL(fc_attach_transport);
2187
2188 void fc_release_transport(struct scsi_transport_template *t)
2189 {
2190         struct fc_internal *i = to_fc_internal(t);
2191
2192         transport_container_unregister(&i->t.target_attrs);
2193         transport_container_unregister(&i->t.host_attrs);
2194         transport_container_unregister(&i->rport_attr_cont);
2195         transport_container_unregister(&i->vport_attr_cont);
2196
2197         kfree(i);
2198 }
2199 EXPORT_SYMBOL(fc_release_transport);
2200
2201 /**
2202  * fc_queue_work - Queue work to the fc_host workqueue.
2203  * @shost:      Pointer to Scsi_Host bound to fc_host.
2204  * @work:       Work to queue for execution.
2205  *
2206  * Return value:
2207  *      1 - work queued for execution
2208  *      0 - work is already queued
2209  *      -EINVAL - work queue doesn't exist
2210  */
2211 static int
2212 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2213 {
2214         if (unlikely(!fc_host_work_q(shost))) {
2215                 printk(KERN_ERR
2216                         "ERROR: FC host '%s' attempted to queue work, "
2217                         "when no workqueue created.\n", shost->hostt->name);
2218                 dump_stack();
2219
2220                 return -EINVAL;
2221         }
2222
2223         return queue_work(fc_host_work_q(shost), work);
2224 }
2225
2226 /**
2227  * fc_flush_work - Flush a fc_host's workqueue.
2228  * @shost:      Pointer to Scsi_Host bound to fc_host.
2229  */
2230 static void
2231 fc_flush_work(struct Scsi_Host *shost)
2232 {
2233         if (!fc_host_work_q(shost)) {
2234                 printk(KERN_ERR
2235                         "ERROR: FC host '%s' attempted to flush work, "
2236                         "when no workqueue created.\n", shost->hostt->name);
2237                 dump_stack();
2238                 return;
2239         }
2240
2241         flush_workqueue(fc_host_work_q(shost));
2242 }
2243
2244 /**
2245  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2246  * @shost:      Pointer to Scsi_Host bound to fc_host.
2247  * @work:       Work to queue for execution.
2248  * @delay:      jiffies to delay the work queuing
2249  *
2250  * Return value:
2251  *      1 on success / 0 already queued / < 0 for error
2252  */
2253 static int
2254 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2255                                 unsigned long delay)
2256 {
2257         if (unlikely(!fc_host_devloss_work_q(shost))) {
2258                 printk(KERN_ERR
2259                         "ERROR: FC host '%s' attempted to queue work, "
2260                         "when no workqueue created.\n", shost->hostt->name);
2261                 dump_stack();
2262
2263                 return -EINVAL;
2264         }
2265
2266         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2267 }
2268
2269 /**
2270  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2271  * @shost:      Pointer to Scsi_Host bound to fc_host.
2272  */
2273 static void
2274 fc_flush_devloss(struct Scsi_Host *shost)
2275 {
2276         if (!fc_host_devloss_work_q(shost)) {
2277                 printk(KERN_ERR
2278                         "ERROR: FC host '%s' attempted to flush work, "
2279                         "when no workqueue created.\n", shost->hostt->name);
2280                 dump_stack();
2281                 return;
2282         }
2283
2284         flush_workqueue(fc_host_devloss_work_q(shost));
2285 }
2286
2287
2288 /**
2289  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2290  * @shost:      Which &Scsi_Host
2291  *
2292  * This routine is expected to be called immediately preceeding the
2293  * a driver's call to scsi_remove_host().
2294  *
2295  * WARNING: A driver utilizing the fc_transport, which fails to call
2296  *   this routine prior to scsi_remove_host(), will leave dangling
2297  *   objects in /sys/class/fc_remote_ports. Access to any of these
2298  *   objects can result in a system crash !!!
2299  *
2300  * Notes:
2301  *      This routine assumes no locks are held on entry.
2302  */
2303 void
2304 fc_remove_host(struct Scsi_Host *shost)
2305 {
2306         struct fc_vport *vport = NULL, *next_vport = NULL;
2307         struct fc_rport *rport = NULL, *next_rport = NULL;
2308         struct workqueue_struct *work_q;
2309         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2310         unsigned long flags;
2311
2312         spin_lock_irqsave(shost->host_lock, flags);
2313
2314         /* Remove any vports */
2315         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2316                 fc_queue_work(shost, &vport->vport_delete_work);
2317
2318         /* Remove any remote ports */
2319         list_for_each_entry_safe(rport, next_rport,
2320                         &fc_host->rports, peers) {
2321                 list_del(&rport->peers);
2322                 rport->port_state = FC_PORTSTATE_DELETED;
2323                 fc_queue_work(shost, &rport->rport_delete_work);
2324         }
2325
2326         list_for_each_entry_safe(rport, next_rport,
2327                         &fc_host->rport_bindings, peers) {
2328                 list_del(&rport->peers);
2329                 rport->port_state = FC_PORTSTATE_DELETED;
2330                 fc_queue_work(shost, &rport->rport_delete_work);
2331         }
2332
2333         spin_unlock_irqrestore(shost->host_lock, flags);
2334
2335         /* flush all scan work items */
2336         scsi_flush_work(shost);
2337
2338         /* flush all stgt delete, and rport delete work items, then kill it  */
2339         if (fc_host->work_q) {
2340                 work_q = fc_host->work_q;
2341                 fc_host->work_q = NULL;
2342                 destroy_workqueue(work_q);
2343         }
2344
2345         /* flush all devloss work items, then kill it  */
2346         if (fc_host->devloss_work_q) {
2347                 work_q = fc_host->devloss_work_q;
2348                 fc_host->devloss_work_q = NULL;
2349                 destroy_workqueue(work_q);
2350         }
2351 }
2352 EXPORT_SYMBOL(fc_remove_host);
2353
2354
2355 /**
2356  * fc_starget_delete - called to delete the scsi decendents of an rport
2357  * @work:       remote port to be operated on.
2358  *
2359  * Deletes target and all sdevs.
2360  */
2361 static void
2362 fc_starget_delete(struct work_struct *work)
2363 {
2364         struct fc_rport *rport =
2365                 container_of(work, struct fc_rport, stgt_delete_work);
2366         struct Scsi_Host *shost = rport_to_shost(rport);
2367         struct fc_internal *i = to_fc_internal(shost->transportt);
2368
2369         /* Involve the LLDD if possible to terminate all io on the rport. */
2370         if (i->f->terminate_rport_io)
2371                 i->f->terminate_rport_io(rport);
2372
2373         scsi_remove_target(&rport->dev);
2374 }
2375
2376
2377 /**
2378  * fc_rport_final_delete - finish rport termination and delete it.
2379  * @work:       remote port to be deleted.
2380  */
2381 static void
2382 fc_rport_final_delete(struct work_struct *work)
2383 {
2384         struct fc_rport *rport =
2385                 container_of(work, struct fc_rport, rport_delete_work);
2386         struct device *dev = &rport->dev;
2387         struct Scsi_Host *shost = rport_to_shost(rport);
2388         struct fc_internal *i = to_fc_internal(shost->transportt);
2389         unsigned long flags;
2390
2391         /*
2392          * if a scan is pending, flush the SCSI Host work_q so that
2393          * that we can reclaim the rport scan work element.
2394          */
2395         if (rport->flags & FC_RPORT_SCAN_PENDING)
2396                 scsi_flush_work(shost);
2397
2398         /* involve the LLDD to terminate all pending i/o */
2399         if (i->f->terminate_rport_io)
2400                 i->f->terminate_rport_io(rport);
2401
2402         /*
2403          * Cancel any outstanding timers. These should really exist
2404          * only when rmmod'ing the LLDD and we're asking for
2405          * immediate termination of the rports
2406          */
2407         spin_lock_irqsave(shost->host_lock, flags);
2408         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2409                 spin_unlock_irqrestore(shost->host_lock, flags);
2410                 if (!cancel_delayed_work(&rport->fail_io_work))
2411                         fc_flush_devloss(shost);
2412                 if (!cancel_delayed_work(&rport->dev_loss_work))
2413                         fc_flush_devloss(shost);
2414                 spin_lock_irqsave(shost->host_lock, flags);
2415                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2416         }
2417         spin_unlock_irqrestore(shost->host_lock, flags);
2418
2419         /* Delete SCSI target and sdevs */
2420         if (rport->scsi_target_id != -1)
2421                 fc_starget_delete(&rport->stgt_delete_work);
2422
2423         /*
2424          * Notify the driver that the rport is now dead. The LLDD will
2425          * also guarantee that any communication to the rport is terminated
2426          */
2427         if (i->f->dev_loss_tmo_callbk)
2428                 i->f->dev_loss_tmo_callbk(rport);
2429
2430         transport_remove_device(dev);
2431         device_del(dev);
2432         transport_destroy_device(dev);
2433         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2434         put_device(dev);                        /* for self-reference */
2435 }
2436
2437
2438 /**
2439  * fc_rport_create - allocates and creates a remote FC port.
2440  * @shost:      scsi host the remote port is connected to.
2441  * @channel:    Channel on shost port connected to.
2442  * @ids:        The world wide names, fc address, and FC4 port
2443  *              roles for the remote port.
2444  *
2445  * Allocates and creates the remoter port structure, including the
2446  * class and sysfs creation.
2447  *
2448  * Notes:
2449  *      This routine assumes no locks are held on entry.
2450  */
2451 static struct fc_rport *
2452 fc_rport_create(struct Scsi_Host *shost, int channel,
2453         struct fc_rport_identifiers  *ids)
2454 {
2455         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2456         struct fc_internal *fci = to_fc_internal(shost->transportt);
2457         struct fc_rport *rport;
2458         struct device *dev;
2459         unsigned long flags;
2460         int error;
2461         size_t size;
2462
2463         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2464         rport = kzalloc(size, GFP_KERNEL);
2465         if (unlikely(!rport)) {
2466                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
2467                 return NULL;
2468         }
2469
2470         rport->maxframe_size = -1;
2471         rport->supported_classes = FC_COS_UNSPECIFIED;
2472         rport->dev_loss_tmo = fc_dev_loss_tmo;
2473         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2474         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2475         rport->port_id = ids->port_id;
2476         rport->roles = ids->roles;
2477         rport->port_state = FC_PORTSTATE_ONLINE;
2478         if (fci->f->dd_fcrport_size)
2479                 rport->dd_data = &rport[1];
2480         rport->channel = channel;
2481         rport->fast_io_fail_tmo = -1;
2482
2483         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2484         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2485         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2486         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2487         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2488
2489         spin_lock_irqsave(shost->host_lock, flags);
2490
2491         rport->number = fc_host->next_rport_number++;
2492         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2493                 rport->scsi_target_id = fc_host->next_target_id++;
2494         else
2495                 rport->scsi_target_id = -1;
2496         list_add_tail(&rport->peers, &fc_host->rports);
2497         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2498
2499         spin_unlock_irqrestore(shost->host_lock, flags);
2500
2501         dev = &rport->dev;
2502         device_initialize(dev);                 /* takes self reference */
2503         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2504         dev->release = fc_rport_dev_release;
2505         sprintf(dev->bus_id, "rport-%d:%d-%d",
2506                 shost->host_no, channel, rport->number);
2507         transport_setup_device(dev);
2508
2509         error = device_add(dev);
2510         if (error) {
2511                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2512                 goto delete_rport;
2513         }
2514         transport_add_device(dev);
2515         transport_configure_device(dev);
2516
2517         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2518                 /* initiate a scan of the target */
2519                 rport->flags |= FC_RPORT_SCAN_PENDING;
2520                 scsi_queue_work(shost, &rport->scan_work);
2521         }
2522
2523         return rport;
2524
2525 delete_rport:
2526         transport_destroy_device(dev);
2527         spin_lock_irqsave(shost->host_lock, flags);
2528         list_del(&rport->peers);
2529         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2530         spin_unlock_irqrestore(shost->host_lock, flags);
2531         put_device(dev->parent);
2532         kfree(rport);
2533         return NULL;
2534 }
2535
2536 /**
2537  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2538  * @shost:      scsi host the remote port is connected to.
2539  * @channel:    Channel on shost port connected to.
2540  * @ids:        The world wide names, fc address, and FC4 port
2541  *              roles for the remote port.
2542  *
2543  * The LLDD calls this routine to notify the transport of the existence
2544  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2545  * of the port, it's FC address (port_id), and the FC4 roles that are
2546  * active for the port.
2547  *
2548  * For ports that are FCP targets (aka scsi targets), the FC transport
2549  * maintains consistent target id bindings on behalf of the LLDD.
2550  * A consistent target id binding is an assignment of a target id to
2551  * a remote port identifier, which persists while the scsi host is
2552  * attached. The remote port can disappear, then later reappear, and
2553  * it's target id assignment remains the same. This allows for shifts
2554  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2555  * changes to the scsi subsystem which is based on scsi host number and
2556  * target id values.  Bindings are only valid during the attachment of
2557  * the scsi host. If the host detaches, then later re-attaches, target
2558  * id bindings may change.
2559  *
2560  * This routine is responsible for returning a remote port structure.
2561  * The routine will search the list of remote ports it maintains
2562  * internally on behalf of consistent target id mappings. If found, the
2563  * remote port structure will be reused. Otherwise, a new remote port
2564  * structure will be allocated.
2565  *
2566  * Whenever a remote port is allocated, a new fc_remote_port class
2567  * device is created.
2568  *
2569  * Should not be called from interrupt context.
2570  *
2571  * Notes:
2572  *      This routine assumes no locks are held on entry.
2573  */
2574 struct fc_rport *
2575 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2576         struct fc_rport_identifiers  *ids)
2577 {
2578         struct fc_internal *fci = to_fc_internal(shost->transportt);
2579         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2580         struct fc_rport *rport;
2581         unsigned long flags;
2582         int match = 0;
2583
2584         /* ensure any stgt delete functions are done */
2585         fc_flush_work(shost);
2586
2587         /*
2588          * Search the list of "active" rports, for an rport that has been
2589          * deleted, but we've held off the real delete while the target
2590          * is in a "blocked" state.
2591          */
2592         spin_lock_irqsave(shost->host_lock, flags);
2593
2594         list_for_each_entry(rport, &fc_host->rports, peers) {
2595
2596                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2597                         (rport->channel == channel)) {
2598
2599                         switch (fc_host->tgtid_bind_type) {
2600                         case FC_TGTID_BIND_BY_WWPN:
2601                         case FC_TGTID_BIND_NONE:
2602                                 if (rport->port_name == ids->port_name)
2603                                         match = 1;
2604                                 break;
2605                         case FC_TGTID_BIND_BY_WWNN:
2606                                 if (rport->node_name == ids->node_name)
2607                                         match = 1;
2608                                 break;
2609                         case FC_TGTID_BIND_BY_ID:
2610                                 if (rport->port_id == ids->port_id)
2611                                         match = 1;
2612                                 break;
2613                         }
2614
2615                         if (match) {
2616
2617                                 memcpy(&rport->node_name, &ids->node_name,
2618                                         sizeof(rport->node_name));
2619                                 memcpy(&rport->port_name, &ids->port_name,
2620                                         sizeof(rport->port_name));
2621                                 rport->port_id = ids->port_id;
2622
2623                                 rport->port_state = FC_PORTSTATE_ONLINE;
2624                                 rport->roles = ids->roles;
2625
2626                                 spin_unlock_irqrestore(shost->host_lock, flags);
2627
2628                                 if (fci->f->dd_fcrport_size)
2629                                         memset(rport->dd_data, 0,
2630                                                 fci->f->dd_fcrport_size);
2631
2632                                 /*
2633                                  * If we were not a target, cancel the
2634                                  * io terminate and rport timers, and
2635                                  * we're done.
2636                                  *
2637                                  * If we were a target, but our new role
2638                                  * doesn't indicate a target, leave the
2639                                  * timers running expecting the role to
2640                                  * change as the target fully logs in. If
2641                                  * it doesn't, the target will be torn down.
2642                                  *
2643                                  * If we were a target, and our role shows
2644                                  * we're still a target, cancel the timers
2645                                  * and kick off a scan.
2646                                  */
2647
2648                                 /* was a target, not in roles */
2649                                 if ((rport->scsi_target_id != -1) &&
2650                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2651                                         return rport;
2652
2653                                 /*
2654                                  * Stop the fail io and dev_loss timers.
2655                                  * If they flush, the port_state will
2656                                  * be checked and will NOOP the function.
2657                                  */
2658                                 if (!cancel_delayed_work(&rport->fail_io_work))
2659                                         fc_flush_devloss(shost);
2660                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2661                                         fc_flush_devloss(shost);
2662
2663                                 spin_lock_irqsave(shost->host_lock, flags);
2664
2665                                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2666
2667                                 /* if target, initiate a scan */
2668                                 if (rport->scsi_target_id != -1) {
2669                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2670                                         scsi_queue_work(shost,
2671                                                         &rport->scan_work);
2672                                         spin_unlock_irqrestore(shost->host_lock,
2673                                                         flags);
2674                                         scsi_target_unblock(&rport->dev);
2675                                 } else
2676                                         spin_unlock_irqrestore(shost->host_lock,
2677                                                         flags);
2678
2679                                 return rport;
2680                         }
2681                 }
2682         }
2683
2684         /*
2685          * Search the bindings array
2686          * Note: if never a FCP target, you won't be on this list
2687          */
2688         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2689
2690                 /* search for a matching consistent binding */
2691
2692                 list_for_each_entry(rport, &fc_host->rport_bindings,
2693                                         peers) {
2694                         if (rport->channel != channel)
2695                                 continue;
2696
2697                         switch (fc_host->tgtid_bind_type) {
2698                         case FC_TGTID_BIND_BY_WWPN:
2699                                 if (rport->port_name == ids->port_name)
2700                                         match = 1;
2701                                 break;
2702                         case FC_TGTID_BIND_BY_WWNN:
2703                                 if (rport->node_name == ids->node_name)
2704                                         match = 1;
2705                                 break;
2706                         case FC_TGTID_BIND_BY_ID:
2707                                 if (rport->port_id == ids->port_id)
2708                                         match = 1;
2709                                 break;
2710                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2711                                 break;
2712                         }
2713
2714                         if (match) {
2715                                 list_move_tail(&rport->peers, &fc_host->rports);
2716                                 break;
2717                         }
2718                 }
2719
2720                 if (match) {
2721                         memcpy(&rport->node_name, &ids->node_name,
2722                                 sizeof(rport->node_name));
2723                         memcpy(&rport->port_name, &ids->port_name,
2724                                 sizeof(rport->port_name));
2725                         rport->port_id = ids->port_id;
2726                         rport->roles = ids->roles;
2727                         rport->port_state = FC_PORTSTATE_ONLINE;
2728
2729                         if (fci->f->dd_fcrport_size)
2730                                 memset(rport->dd_data, 0,
2731                                                 fci->f->dd_fcrport_size);
2732
2733                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2734                                 /* initiate a scan of the target */
2735                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2736                                 scsi_queue_work(shost, &rport->scan_work);
2737                                 spin_unlock_irqrestore(shost->host_lock, flags);
2738                                 scsi_target_unblock(&rport->dev);
2739                         } else
2740                                 spin_unlock_irqrestore(shost->host_lock, flags);
2741
2742                         return rport;
2743                 }
2744         }
2745
2746         spin_unlock_irqrestore(shost->host_lock, flags);
2747
2748         /* No consistent binding found - create new remote port entry */
2749         rport = fc_rport_create(shost, channel, ids);
2750
2751         return rport;
2752 }
2753 EXPORT_SYMBOL(fc_remote_port_add);
2754
2755
2756 /**
2757  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2758  * @rport:      The remote port that no longer exists
2759  *
2760  * The LLDD calls this routine to notify the transport that a remote
2761  * port is no longer part of the topology. Note: Although a port
2762  * may no longer be part of the topology, it may persist in the remote
2763  * ports displayed by the fc_host. We do this under 2 conditions:
2764  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2765  *   This allows the port to temporarily disappear, then reappear without
2766  *   disrupting the SCSI device tree attached to it. During the "blocked"
2767  *   period the port will still exist.
2768  * 2) If the port was a scsi target and disappears for longer than we
2769  *   expect, we'll delete the port and the tear down the SCSI device tree
2770  *   attached to it. However, we want to semi-persist the target id assigned
2771  *   to that port if it eventually does exist. The port structure will
2772  *   remain (although with minimal information) so that the target id
2773  *   bindings remails.
2774  *
2775  * If the remote port is not an FCP Target, it will be fully torn down
2776  * and deallocated, including the fc_remote_port class device.
2777  *
2778  * If the remote port is an FCP Target, the port will be placed in a
2779  * temporary blocked state. From the LLDD's perspective, the rport no
2780  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2781  * exists, but all sdevs on it are blocked from further I/O. The following
2782  * is then expected.
2783  *
2784  *   If the remote port does not return (signaled by a LLDD call to
2785  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2786  *   scsi target is removed - killing all outstanding i/o and removing the
2787  *   scsi devices attached ot it. The port structure will be marked Not
2788  *   Present and be partially cleared, leaving only enough information to
2789  *   recognize the remote port relative to the scsi target id binding if
2790  *   it later appears.  The port will remain as long as there is a valid
2791  *   binding (e.g. until the user changes the binding type or unloads the
2792  *   scsi host with the binding).
2793  *
2794  *   If the remote port returns within the dev_loss_tmo value (and matches
2795  *   according to the target id binding type), the port structure will be
2796  *   reused. If it is no longer a SCSI target, the target will be torn
2797  *   down. If it continues to be a SCSI target, then the target will be
2798  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2799  *   to ensure that all luns are detected.
2800  *
2801  * Called from normal process context only - cannot be called from interrupt.
2802  *
2803  * Notes:
2804  *      This routine assumes no locks are held on entry.
2805  */
2806 void
2807 fc_remote_port_delete(struct fc_rport  *rport)
2808 {
2809         struct Scsi_Host *shost = rport_to_shost(rport);
2810         struct fc_internal *i = to_fc_internal(shost->transportt);
2811         int timeout = rport->dev_loss_tmo;
2812         unsigned long flags;
2813
2814         /*
2815          * No need to flush the fc_host work_q's, as all adds are synchronous.
2816          *
2817          * We do need to reclaim the rport scan work element, so eventually
2818          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2819          * there's still a scan pending.
2820          */
2821
2822         spin_lock_irqsave(shost->host_lock, flags);
2823
2824         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2825                 spin_unlock_irqrestore(shost->host_lock, flags);
2826                 return;
2827         }
2828
2829         /*
2830          * In the past, we if this was not an FCP-Target, we would
2831          * unconditionally just jump to deleting the rport.
2832          * However, rports can be used as node containers by the LLDD,
2833          * and its not appropriate to just terminate the rport at the
2834          * first sign of a loss in connectivity. The LLDD may want to
2835          * send ELS traffic to re-validate the login. If the rport is
2836          * immediately deleted, it makes it inappropriate for a node
2837          * container.
2838          * So... we now unconditionally wait dev_loss_tmo before
2839          * destroying an rport.
2840          */
2841
2842         rport->port_state = FC_PORTSTATE_BLOCKED;
2843
2844         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2845
2846         spin_unlock_irqrestore(shost->host_lock, flags);
2847
2848         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2849             shost->active_mode & MODE_TARGET)
2850                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2851
2852         scsi_target_block(&rport->dev);
2853
2854         /* see if we need to kill io faster than waiting for device loss */
2855         if ((rport->fast_io_fail_tmo != -1) &&
2856             (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
2857                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2858                                         rport->fast_io_fail_tmo * HZ);
2859
2860         /* cap the length the devices can be blocked until they are deleted */
2861         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2862 }
2863 EXPORT_SYMBOL(fc_remote_port_delete);
2864
2865 /**
2866  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2867  * @rport:      The remote port that changed.
2868  * @roles:      New roles for this port.
2869  *
2870  * Description: The LLDD calls this routine to notify the transport that the
2871  * roles on a remote port may have changed. The largest effect of this is
2872  * if a port now becomes a FCP Target, it must be allocated a
2873  * scsi target id.  If the port is no longer a FCP target, any
2874  * scsi target id value assigned to it will persist in case the
2875  * role changes back to include FCP Target. No changes in the scsi
2876  * midlayer will be invoked if the role changes (in the expectation
2877  * that the role will be resumed. If it doesn't normal error processing
2878  * will take place).
2879  *
2880  * Should not be called from interrupt context.
2881  *
2882  * Notes:
2883  *      This routine assumes no locks are held on entry.
2884  */
2885 void
2886 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2887 {
2888         struct Scsi_Host *shost = rport_to_shost(rport);
2889         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2890         unsigned long flags;
2891         int create = 0;
2892         int ret;
2893
2894         spin_lock_irqsave(shost->host_lock, flags);
2895         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2896                 if (rport->scsi_target_id == -1) {
2897                         rport->scsi_target_id = fc_host->next_target_id++;
2898                         create = 1;
2899                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2900                         create = 1;
2901         } else if (shost->active_mode & MODE_TARGET) {
2902                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2903                                              (char *)&rport->node_name);
2904                 if (ret)
2905                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2906                                ret);
2907         }
2908
2909         rport->roles = roles;
2910
2911         spin_unlock_irqrestore(shost->host_lock, flags);
2912
2913         if (create) {
2914                 /*
2915                  * There may have been a delete timer running on the
2916                  * port. Ensure that it is cancelled as we now know
2917                  * the port is an FCP Target.
2918                  * Note: we know the rport is exists and in an online
2919                  *  state as the LLDD would not have had an rport
2920                  *  reference to pass us.
2921                  *
2922                  * Take no action on the del_timer failure as the state
2923                  * machine state change will validate the
2924                  * transaction.
2925                  */
2926                 if (!cancel_delayed_work(&rport->fail_io_work))
2927                         fc_flush_devloss(shost);
2928                 if (!cancel_delayed_work(&rport->dev_loss_work))
2929                         fc_flush_devloss(shost);
2930
2931                 spin_lock_irqsave(shost->host_lock, flags);
2932                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2933                 spin_unlock_irqrestore(shost->host_lock, flags);
2934
2935                 /* ensure any stgt delete functions are done */
2936                 fc_flush_work(shost);
2937
2938                 /* initiate a scan of the target */
2939                 spin_lock_irqsave(shost->host_lock, flags);
2940                 rport->flags |= FC_RPORT_SCAN_PENDING;
2941                 scsi_queue_work(shost, &rport->scan_work);
2942                 spin_unlock_irqrestore(shost->host_lock, flags);
2943                 scsi_target_unblock(&rport->dev);
2944         }
2945 }
2946 EXPORT_SYMBOL(fc_remote_port_rolechg);
2947
2948 /**
2949  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2950  * @work:       rport target that failed to reappear in the allotted time.
2951  *
2952  * Description: An attempt to delete a remote port blocks, and if it fails
2953  *              to return in the allotted time this gets called.
2954  */
2955 static void
2956 fc_timeout_deleted_rport(struct work_struct *work)
2957 {
2958         struct fc_rport *rport =
2959                 container_of(work, struct fc_rport, dev_loss_work.work);
2960         struct Scsi_Host *shost = rport_to_shost(rport);
2961         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2962         unsigned long flags;
2963
2964         spin_lock_irqsave(shost->host_lock, flags);
2965
2966         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2967
2968         /*
2969          * If the port is ONLINE, then it came back. If it was a SCSI
2970          * target, validate it still is. If not, tear down the
2971          * scsi_target on it.
2972          */
2973         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2974             (rport->scsi_target_id != -1) &&
2975             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2976                 dev_printk(KERN_ERR, &rport->dev,
2977                         "blocked FC remote port time out: no longer"
2978                         " a FCP target, removing starget\n");
2979                 spin_unlock_irqrestore(shost->host_lock, flags);
2980                 scsi_target_unblock(&rport->dev);
2981                 fc_queue_work(shost, &rport->stgt_delete_work);
2982                 return;
2983         }
2984
2985         /* NOOP state - we're flushing workq's */
2986         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2987                 spin_unlock_irqrestore(shost->host_lock, flags);
2988                 dev_printk(KERN_ERR, &rport->dev,
2989                         "blocked FC remote port time out: leaving"
2990                         " rport%s alone\n",
2991                         (rport->scsi_target_id != -1) ?  " and starget" : "");
2992                 return;
2993         }
2994
2995         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
2996             (rport->scsi_target_id == -1)) {
2997                 list_del(&rport->peers);
2998                 rport->port_state = FC_PORTSTATE_DELETED;
2999                 dev_printk(KERN_ERR, &rport->dev,
3000                         "blocked FC remote port time out: removing"
3001                         " rport%s\n",
3002                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3003                 fc_queue_work(shost, &rport->rport_delete_work);
3004                 spin_unlock_irqrestore(shost->host_lock, flags);
3005                 return;
3006         }
3007
3008         dev_printk(KERN_ERR, &rport->dev,
3009                 "blocked FC remote port time out: removing target and "
3010                 "saving binding\n");
3011
3012         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3013
3014         /*
3015          * Note: We do not remove or clear the hostdata area. This allows
3016          *   host-specific target data to persist along with the
3017          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3018          */
3019
3020         /*
3021          * Reinitialize port attributes that may change if the port comes back.
3022          */
3023         rport->maxframe_size = -1;
3024         rport->supported_classes = FC_COS_UNSPECIFIED;
3025         rport->roles = FC_PORT_ROLE_UNKNOWN;
3026         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3027
3028         /* remove the identifiers that aren't used in the consisting binding */
3029         switch (fc_host->tgtid_bind_type) {
3030         case FC_TGTID_BIND_BY_WWPN:
3031                 rport->node_name = -1;
3032                 rport->port_id = -1;
3033                 break;
3034         case FC_TGTID_BIND_BY_WWNN:
3035                 rport->port_name = -1;
3036                 rport->port_id = -1;
3037                 break;
3038         case FC_TGTID_BIND_BY_ID:
3039                 rport->node_name = -1;
3040                 rport->port_name = -1;
3041                 break;
3042         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3043                 break;
3044         }
3045
3046         /*
3047          * As this only occurs if the remote port (scsi target)
3048          * went away and didn't come back - we'll remove
3049          * all attached scsi devices.
3050          */
3051         spin_unlock_irqrestore(shost->host_lock, flags);
3052
3053         scsi_target_unblock(&rport->dev);
3054         fc_queue_work(shost, &rport->stgt_delete_work);
3055 }
3056
3057 /**
3058  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3059  * @work:       rport to terminate io on.
3060  *
3061  * Notes: Only requests the failure of the io, not that all are flushed
3062  *    prior to returning.
3063  */
3064 static void
3065 fc_timeout_fail_rport_io(struct work_struct *work)
3066 {
3067         struct fc_rport *rport =
3068                 container_of(work, struct fc_rport, fail_io_work.work);
3069         struct Scsi_Host *shost = rport_to_shost(rport);
3070         struct fc_internal *i = to_fc_internal(shost->transportt);
3071
3072         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3073                 return;
3074
3075         i->f->terminate_rport_io(rport);
3076 }
3077
3078 /**
3079  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3080  * @work:       remote port to be scanned.
3081  */
3082 static void
3083 fc_scsi_scan_rport(struct work_struct *work)
3084 {
3085         struct fc_rport *rport =
3086                 container_of(work, struct fc_rport, scan_work);
3087         struct Scsi_Host *shost = rport_to_shost(rport);
3088         struct fc_internal *i = to_fc_internal(shost->transportt);
3089         unsigned long flags;
3090
3091         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3092             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3093             !(i->f->disable_target_scan)) {
3094                 scsi_scan_target(&rport->dev, rport->channel,
3095                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3096         }
3097
3098         spin_lock_irqsave(shost->host_lock, flags);
3099         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3100         spin_unlock_irqrestore(shost->host_lock, flags);
3101 }
3102
3103
3104 /**
3105  * fc_vport_create - allocates and creates a FC virtual port.
3106  * @shost:      scsi host the virtual port is connected to.
3107  * @channel:    Channel on shost port connected to.
3108  * @pdev:       parent device for vport
3109  * @ids:        The world wide names, FC4 port roles, etc for
3110  *              the virtual port.
3111  * @ret_vport:  The pointer to the created vport.
3112  *
3113  * Allocates and creates the vport structure, calls the parent host
3114  * to instantiate the vport, the completes w/ class and sysfs creation.
3115  *
3116  * Notes:
3117  *      This routine assumes no locks are held on entry.
3118  */
3119 static int
3120 fc_vport_create(struct Scsi_Host *shost, int channel, struct device *pdev,
3121         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3122 {
3123         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3124         struct fc_internal *fci = to_fc_internal(shost->transportt);
3125         struct fc_vport *vport;
3126         struct device *dev;
3127         unsigned long flags;
3128         size_t size;
3129         int error;
3130
3131         *ret_vport = NULL;
3132
3133         if ( ! fci->f->vport_create)
3134                 return -ENOENT;
3135
3136         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3137         vport = kzalloc(size, GFP_KERNEL);
3138         if (unlikely(!vport)) {
3139                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
3140                 return -ENOMEM;
3141         }
3142
3143         vport->vport_state = FC_VPORT_UNKNOWN;
3144         vport->vport_last_state = FC_VPORT_UNKNOWN;
3145         vport->node_name = ids->node_name;
3146         vport->port_name = ids->port_name;
3147         vport->roles = ids->roles;
3148         vport->vport_type = ids->vport_type;
3149         if (fci->f->dd_fcvport_size)
3150                 vport->dd_data = &vport[1];
3151         vport->shost = shost;
3152         vport->channel = channel;
3153         vport->flags = FC_VPORT_CREATING;
3154         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3155
3156         spin_lock_irqsave(shost->host_lock, flags);
3157
3158         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3159                 spin_unlock_irqrestore(shost->host_lock, flags);
3160                 kfree(vport);
3161                 return -ENOSPC;
3162         }
3163         fc_host->npiv_vports_inuse++;
3164         vport->number = fc_host->next_vport_number++;
3165         list_add_tail(&vport->peers, &fc_host->vports);
3166         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3167
3168         spin_unlock_irqrestore(shost->host_lock, flags);
3169
3170         dev = &vport->dev;
3171         device_initialize(dev);                 /* takes self reference */
3172         dev->parent = get_device(pdev);         /* takes parent reference */
3173         dev->release = fc_vport_dev_release;
3174         sprintf(dev->bus_id, "vport-%d:%d-%d",
3175                 shost->host_no, channel, vport->number);
3176         transport_setup_device(dev);
3177
3178         error = device_add(dev);
3179         if (error) {
3180                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3181                 goto delete_vport;
3182         }
3183         transport_add_device(dev);
3184         transport_configure_device(dev);
3185
3186         error = fci->f->vport_create(vport, ids->disable);
3187         if (error) {
3188                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3189                 goto delete_vport_all;
3190         }
3191
3192         /*
3193          * if the parent isn't the physical adapter's Scsi_Host, ensure
3194          * the Scsi_Host at least contains ia symlink to the vport.
3195          */
3196         if (pdev != &shost->shost_gendev) {
3197                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3198                                  &dev->kobj, dev->bus_id);
3199                 if (error)
3200                         printk(KERN_ERR
3201                                 "%s: Cannot create vport symlinks for "
3202                                 "%s, err=%d\n",
3203                                 __FUNCTION__, dev->bus_id, error);
3204         }
3205         spin_lock_irqsave(shost->host_lock, flags);
3206         vport->flags &= ~FC_VPORT_CREATING;
3207         spin_unlock_irqrestore(shost->host_lock, flags);
3208
3209         dev_printk(KERN_NOTICE, pdev,
3210                         "%s created via shost%d channel %d\n", dev->bus_id,
3211                         shost->host_no, channel);
3212
3213         *ret_vport = vport;
3214
3215         return 0;
3216
3217 delete_vport_all:
3218         transport_remove_device(dev);
3219         device_del(dev);
3220 delete_vport:
3221         transport_destroy_device(dev);
3222         spin_lock_irqsave(shost->host_lock, flags);
3223         list_del(&vport->peers);
3224         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3225         fc_host->npiv_vports_inuse--;
3226         spin_unlock_irqrestore(shost->host_lock, flags);
3227         put_device(dev->parent);
3228         kfree(vport);
3229
3230         return error;
3231 }
3232
3233
3234 /**
3235  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3236  * @vport:      fc_vport to be terminated
3237  *
3238  * Calls the LLDD vport_delete() function, then deallocates and removes
3239  * the vport from the shost and object tree.
3240  *
3241  * Notes:
3242  *      This routine assumes no locks are held on entry.
3243  */
3244 int
3245 fc_vport_terminate(struct fc_vport *vport)
3246 {
3247         struct Scsi_Host *shost = vport_to_shost(vport);
3248         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3249         struct fc_internal *i = to_fc_internal(shost->transportt);
3250         struct device *dev = &vport->dev;
3251         unsigned long flags;
3252         int stat;
3253
3254         spin_lock_irqsave(shost->host_lock, flags);
3255         if (vport->flags & FC_VPORT_CREATING) {
3256                 spin_unlock_irqrestore(shost->host_lock, flags);
3257                 return -EBUSY;
3258         }
3259         if (vport->flags & (FC_VPORT_DEL)) {
3260                 spin_unlock_irqrestore(shost->host_lock, flags);
3261                 return -EALREADY;
3262         }
3263         vport->flags |= FC_VPORT_DELETING;
3264         spin_unlock_irqrestore(shost->host_lock, flags);
3265
3266         if (i->f->vport_delete)
3267                 stat = i->f->vport_delete(vport);
3268         else
3269                 stat = -ENOENT;
3270
3271         spin_lock_irqsave(shost->host_lock, flags);
3272         vport->flags &= ~FC_VPORT_DELETING;
3273         if (!stat) {
3274                 vport->flags |= FC_VPORT_DELETED;
3275                 list_del(&vport->peers);
3276                 fc_host->npiv_vports_inuse--;
3277                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3278         }
3279         spin_unlock_irqrestore(shost->host_lock, flags);
3280
3281         if (stat)
3282                 return stat;
3283
3284         if (dev->parent != &shost->shost_gendev)
3285                 sysfs_remove_link(&shost->shost_gendev.kobj, dev->bus_id);
3286         transport_remove_device(dev);
3287         device_del(dev);
3288         transport_destroy_device(dev);
3289
3290         /*
3291          * Removing our self-reference should mean our
3292          * release function gets called, which will drop the remaining
3293          * parent reference and free the data structure.
3294          */
3295         put_device(dev);                        /* for self-reference */
3296
3297         return 0; /* SUCCESS */
3298 }
3299 EXPORT_SYMBOL(fc_vport_terminate);
3300
3301 /**
3302  * fc_vport_sched_delete - workq-based delete request for a vport
3303  * @work:       vport to be deleted.
3304  */
3305 static void
3306 fc_vport_sched_delete(struct work_struct *work)
3307 {
3308         struct fc_vport *vport =
3309                 container_of(work, struct fc_vport, vport_delete_work);
3310         int stat;
3311
3312         stat = fc_vport_terminate(vport);
3313         if (stat)
3314                 dev_printk(KERN_ERR, vport->dev.parent,
3315                         "%s: %s could not be deleted created via "
3316                         "shost%d channel %d - error %d\n", __FUNCTION__,
3317                         vport->dev.bus_id, vport->shost->host_no,
3318                         vport->channel, stat);
3319 }
3320
3321
3322 /* Original Author:  Martin Hicks */
3323 MODULE_AUTHOR("James Smart");
3324 MODULE_DESCRIPTION("FC Transport Attributes");
3325 MODULE_LICENSE("GPL");
3326
3327 module_init(fc_transport_init);
3328 module_exit(fc_transport_exit);