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