drivers/scsi/scsi_transport_fc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  FiberChannel transport specific attributes exported to sysfs.
   4  *
   5  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   6  *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
   7  *    Rewrite for host, target, device, and remote port attributes,
   8  *    statistics, and service functions...
   9  *    Add vports, etc
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/kernel.h>
  16 #include <linux/bsg-lib.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_fc.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <net/netlink.h>
  23 #include <scsi/scsi_netlink_fc.h>
  24 #include <scsi/scsi_bsg_fc.h>
  25 #include <uapi/scsi/fc/fc_els.h>
  26 #include "scsi_priv.h"
  27
  28 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  29 static void fc_vport_sched_delete(struct work_struct *work);
  30 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  31         struct device *pdev, struct fc_vport_identifiers  *ids,
  32         struct fc_vport **vport);
  33 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  34 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  35 static void fc_bsg_remove(struct request_queue *);
  36 static void fc_bsg_goose_queue(struct fc_rport *);
  37 static void fc_li_stats_update(u16 event_type,
  38                                struct fc_fpin_stats *stats);
  39 static void fc_delivery_stats_update(u32 reason_code,
  40                                      struct fc_fpin_stats *stats);
  41 static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
  42
  43 /*
  44  * Module Parameters
  45  */
  46
  47 /*
  48  * dev_loss_tmo: the default number of seconds that the FC transport
  49  *   should insulate the loss of a remote port.
  50  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
  51  */
  52 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
  53
  54 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
  55 MODULE_PARM_DESC(dev_loss_tmo,
  56                  "Maximum number of seconds that the FC transport should"
  57                  " insulate the loss of a remote port. Once this value is"
  58                  " exceeded, the scsi target is removed. Value should be"
  59                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
  60                  " fast_io_fail_tmo is not set.");
  61
  62 /*
  63  * Redefine so that we can have same named attributes in the
  64  * sdev/starget/host objects.
  65  */
  66 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  67 struct device_attribute device_attr_##_prefix##_##_name =       \
  68         __ATTR(_name,_mode,_show,_store)
  69
  70 #define fc_enum_name_search(title, table_type, table)                   \
  71 static const char *get_fc_##title##_name(enum table_type table_key)     \
  72 {                                                                       \
  73         int i;                                                          \
  74         char *name = NULL;                                              \
  75                                                                         \
  76         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  77                 if (table[i].value == table_key) {                      \
  78                         name = table[i].name;                           \
  79                         break;                                          \
  80                 }                                                       \
  81         }                                                               \
  82         return name;                                                    \
  83 }
  84
  85 #define fc_enum_name_match(title, table_type, table)                    \
  86 static int get_fc_##title##_match(const char *table_key,                \
  87                 enum table_type *value)                                 \
  88 {                                                                       \
  89         int i;                                                          \
  90                                                                         \
  91         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  92                 if (strncmp(table_key, table[i].name,                   \
  93                                 table[i].matchlen) == 0) {              \
  94                         *value = table[i].value;                        \
  95                         return 0; /* success */                         \
  96                 }                                                       \
  97         }                                                               \
  98         return 1; /* failure */                                         \
  99 }
 100
 101
 102 /* Convert fc_port_type values to ascii string name */
 103 static struct {
 104         enum fc_port_type       value;
 105         char                    *name;
 106 } fc_port_type_names[] = {
 107         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 108         { FC_PORTTYPE_OTHER,            "Other" },
 109         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 110         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 111         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 112         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 113         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 114         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 115 };
 116 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 117 #define FC_PORTTYPE_MAX_NAMELEN         50
 118
 119 /* Reuse fc_port_type enum function for vport_type */
 120 #define get_fc_vport_type_name get_fc_port_type_name
 121
 122
 123 /* Convert fc_host_event_code values to ascii string name */
 124 static const struct {
 125         enum fc_host_event_code         value;
 126         char                            *name;
 127 } fc_host_event_code_names[] = {
 128         { FCH_EVT_LIP,                  "lip" },
 129         { FCH_EVT_LINKUP,               "link_up" },
 130         { FCH_EVT_LINKDOWN,             "link_down" },
 131         { FCH_EVT_LIPRESET,             "lip_reset" },
 132         { FCH_EVT_RSCN,                 "rscn" },
 133         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 134         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 135         { FCH_EVT_PORT_ONLINE,          "port_online" },
 136         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 137         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 138         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 139         { FCH_EVT_LINK_FPIN,            "link_FPIN" },
 140         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 141 };
 142 fc_enum_name_search(host_event_code, fc_host_event_code,
 143                 fc_host_event_code_names)
 144 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 145
 146
 147 /* Convert fc_port_state values to ascii string name */
 148 static struct {
 149         enum fc_port_state      value;
 150         char                    *name;
 151         int                     matchlen;
 152 } fc_port_state_names[] = {
 153         { FC_PORTSTATE_UNKNOWN,         "Unknown", 7},
 154         { FC_PORTSTATE_NOTPRESENT,      "Not Present", 11 },
 155         { FC_PORTSTATE_ONLINE,          "Online", 6 },
 156         { FC_PORTSTATE_OFFLINE,         "Offline", 7 },
 157         { FC_PORTSTATE_BLOCKED,         "Blocked", 7 },
 158         { FC_PORTSTATE_BYPASSED,        "Bypassed", 8 },
 159         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics", 11 },
 160         { FC_PORTSTATE_LINKDOWN,        "Linkdown", 8 },
 161         { FC_PORTSTATE_ERROR,           "Error", 5 },
 162         { FC_PORTSTATE_LOOPBACK,        "Loopback", 8 },
 163         { FC_PORTSTATE_DELETED,         "Deleted", 7 },
 164         { FC_PORTSTATE_MARGINAL,        "Marginal", 8 },
 165 };
 166 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 167 fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
 168 #define FC_PORTSTATE_MAX_NAMELEN        20
 169
 170
 171 /* Convert fc_vport_state values to ascii string name */
 172 static struct {
 173         enum fc_vport_state     value;
 174         char                    *name;
 175 } fc_vport_state_names[] = {
 176         { FC_VPORT_UNKNOWN,             "Unknown" },
 177         { FC_VPORT_ACTIVE,              "Active" },
 178         { FC_VPORT_DISABLED,            "Disabled" },
 179         { FC_VPORT_LINKDOWN,            "Linkdown" },
 180         { FC_VPORT_INITIALIZING,        "Initializing" },
 181         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 182         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 183         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 184         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 185         { FC_VPORT_FAILED,              "VPort Failed" },
 186 };
 187 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 188 #define FC_VPORTSTATE_MAX_NAMELEN       24
 189
 190 /* Reuse fc_vport_state enum function for vport_last_state */
 191 #define get_fc_vport_last_state_name get_fc_vport_state_name
 192
 193
 194 /* Convert fc_tgtid_binding_type values to ascii string name */
 195 static const struct {
 196         enum fc_tgtid_binding_type      value;
 197         char                            *name;
 198         int                             matchlen;
 199 } fc_tgtid_binding_type_names[] = {
 200         { FC_TGTID_BIND_NONE, "none", 4 },
 201         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 202         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 203         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 204 };
 205 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 206                 fc_tgtid_binding_type_names)
 207 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 208                 fc_tgtid_binding_type_names)
 209 #define FC_BINDTYPE_MAX_NAMELEN 30
 210
 211
 212 #define fc_bitfield_name_search(title, table)                   \
 213 static ssize_t                                                  \
 214 get_fc_##title##_names(u32 table_key, char *buf)                \
 215 {                                                               \
 216         char *prefix = "";                                      \
 217         ssize_t len = 0;                                        \
 218         int i;                                                  \
 219                                                                 \
 220         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 221                 if (table[i].value & table_key) {               \
 222                         len += sprintf(buf + len, "%s%s",       \
 223                                 prefix, table[i].name);         \
 224                         prefix = ", ";                          \
 225                 }                                               \
 226         }                                                       \
 227         len += sprintf(buf + len, "\n");                        \
 228         return len;                                             \
 229 }
 230
 231
 232 /* Convert FC_COS bit values to ascii string name */
 233 static const struct {
 234         u32                     value;
 235         char                    *name;
 236 } fc_cos_names[] = {
 237         { FC_COS_CLASS1,        "Class 1" },
 238         { FC_COS_CLASS2,        "Class 2" },
 239         { FC_COS_CLASS3,        "Class 3" },
 240         { FC_COS_CLASS4,        "Class 4" },
 241         { FC_COS_CLASS6,        "Class 6" },
 242 };
 243 fc_bitfield_name_search(cos, fc_cos_names)
 244
 245
 246 /* Convert FC_PORTSPEED bit values to ascii string name */
 247 static const struct {
 248         u32                     value;
 249         char                    *name;
 250 } fc_port_speed_names[] = {
 251         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 252         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 253         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 254         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 255         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 256         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 257         { FC_PORTSPEED_32GBIT,          "32 Gbit" },
 258         { FC_PORTSPEED_20GBIT,          "20 Gbit" },
 259         { FC_PORTSPEED_40GBIT,          "40 Gbit" },
 260         { FC_PORTSPEED_50GBIT,          "50 Gbit" },
 261         { FC_PORTSPEED_100GBIT,         "100 Gbit" },
 262         { FC_PORTSPEED_25GBIT,          "25 Gbit" },
 263         { FC_PORTSPEED_64GBIT,          "64 Gbit" },
 264         { FC_PORTSPEED_128GBIT,         "128 Gbit" },
 265         { FC_PORTSPEED_256GBIT,         "256 Gbit" },
 266         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 267 };
 268 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 269
 270
 271 static int
 272 show_fc_fc4s (char *buf, u8 *fc4_list)
 273 {
 274         int i, len=0;
 275
 276         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 277                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 278         len += sprintf(buf + len, "\n");
 279         return len;
 280 }
 281
 282
 283 /* Convert FC_PORT_ROLE bit values to ascii string name */
 284 static const struct {
 285         u32                     value;
 286         char                    *name;
 287 } fc_port_role_names[] = {
 288         { FC_PORT_ROLE_FCP_TARGET,              "FCP Target" },
 289         { FC_PORT_ROLE_FCP_INITIATOR,           "FCP Initiator" },
 290         { FC_PORT_ROLE_IP_PORT,                 "IP Port" },
 291         { FC_PORT_ROLE_FCP_DUMMY_INITIATOR,     "FCP Dummy Initiator" },
 292         { FC_PORT_ROLE_NVME_INITIATOR,          "NVMe Initiator" },
 293         { FC_PORT_ROLE_NVME_TARGET,             "NVMe Target" },
 294         { FC_PORT_ROLE_NVME_DISCOVERY,          "NVMe Discovery" },
 295 };
 296 fc_bitfield_name_search(port_roles, fc_port_role_names)
 297
 298 /*
 299  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 300  */
 301 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 302 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 303 #define FC_FPORT_PORTID                 0x00000e
 304 #define FC_FABCTLR_PORTID               0x00000d
 305 #define FC_DIRSRVR_PORTID               0x00000c
 306 #define FC_TIMESRVR_PORTID              0x00000b
 307 #define FC_MGMTSRVR_PORTID              0x00000a
 308
 309
 310 static void fc_timeout_deleted_rport(struct work_struct *work);
 311 static void fc_timeout_fail_rport_io(struct work_struct *work);
 312 static void fc_scsi_scan_rport(struct work_struct *work);
 313
 314 /*
 315  * Attribute counts pre object type...
 316  * Increase these values if you add attributes
 317  */
 318 #define FC_STARGET_NUM_ATTRS    3
 319 #define FC_RPORT_NUM_ATTRS      10
 320 #define FC_VPORT_NUM_ATTRS      9
 321 #define FC_HOST_NUM_ATTRS       29
 322
 323 struct fc_internal {
 324         struct scsi_transport_template t;
 325         struct fc_function_template *f;
 326
 327         /*
 328          * For attributes : each object has :
 329          *   An array of the actual attributes structures
 330          *   An array of null-terminated pointers to the attribute
 331          *     structures - used for mid-layer interaction.
 332          *
 333          * The attribute containers for the starget and host are are
 334          * part of the midlayer. As the remote port is specific to the
 335          * fc transport, we must provide the attribute container.
 336          */
 337         struct device_attribute private_starget_attrs[
 338                                                         FC_STARGET_NUM_ATTRS];
 339         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 340
 341         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 342         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 343
 344         struct transport_container rport_attr_cont;
 345         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 346         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 347
 348         struct transport_container vport_attr_cont;
 349         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 350         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 351 };
 352
 353 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 354
 355 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 356                            struct device *cdev)
 357 {
 358         struct scsi_target *starget = to_scsi_target(dev);
 359         struct fc_rport *rport = starget_to_rport(starget);
 360
 361         /*
 362          * if parent is remote port, use values from remote port.
 363          * Otherwise, this host uses the fc_transport, but not the
 364          * remote port interface. As such, initialize to known non-values.
 365          */
 366         if (rport) {
 367                 fc_starget_node_name(starget) = rport->node_name;
 368                 fc_starget_port_name(starget) = rport->port_name;
 369                 fc_starget_port_id(starget) = rport->port_id;
 370         } else {
 371                 fc_starget_node_name(starget) = -1;
 372                 fc_starget_port_name(starget) = -1;
 373                 fc_starget_port_id(starget) = -1;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 380                                "fc_transport",
 381                                fc_target_setup,
 382                                NULL,
 383                                NULL);
 384
 385 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 386                          struct device *cdev)
 387 {
 388         struct Scsi_Host *shost = dev_to_shost(dev);
 389         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 390
 391         /*
 392          * Set default values easily detected by the midlayer as
 393          * failure cases.  The scsi lldd is responsible for initializing
 394          * all transport attributes to valid values per host.
 395          */
 396         fc_host->node_name = -1;
 397         fc_host->port_name = -1;
 398         fc_host->permanent_port_name = -1;
 399         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 400         memset(fc_host->supported_fc4s, 0,
 401                 sizeof(fc_host->supported_fc4s));
 402         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 403         fc_host->maxframe_size = -1;
 404         fc_host->max_npiv_vports = 0;
 405         memset(fc_host->serial_number, 0,
 406                 sizeof(fc_host->serial_number));
 407         memset(fc_host->manufacturer, 0,
 408                 sizeof(fc_host->manufacturer));
 409         memset(fc_host->model, 0,
 410                 sizeof(fc_host->model));
 411         memset(fc_host->model_description, 0,
 412                 sizeof(fc_host->model_description));
 413         memset(fc_host->hardware_version, 0,
 414                 sizeof(fc_host->hardware_version));
 415         memset(fc_host->driver_version, 0,
 416                 sizeof(fc_host->driver_version));
 417         memset(fc_host->firmware_version, 0,
 418                 sizeof(fc_host->firmware_version));
 419         memset(fc_host->optionrom_version, 0,
 420                 sizeof(fc_host->optionrom_version));
 421
 422         fc_host->port_id = -1;
 423         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 424         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 425         memset(fc_host->active_fc4s, 0,
 426                 sizeof(fc_host->active_fc4s));
 427         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 428         fc_host->fabric_name = -1;
 429         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 430         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 431         memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
 432
 433         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 434
 435         INIT_LIST_HEAD(&fc_host->rports);
 436         INIT_LIST_HEAD(&fc_host->rport_bindings);
 437         INIT_LIST_HEAD(&fc_host->vports);
 438         fc_host->next_rport_number = 0;
 439         fc_host->next_target_id = 0;
 440         fc_host->next_vport_number = 0;
 441         fc_host->npiv_vports_inuse = 0;
 442
 443         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 444                  "fc_wq_%d", shost->host_no);
 445         fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
 446         if (!fc_host->work_q)
 447                 return -ENOMEM;
 448
 449         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
 450         snprintf(fc_host->devloss_work_q_name,
 451                  sizeof(fc_host->devloss_work_q_name),
 452                  "fc_dl_%d", shost->host_no);
 453         fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
 454                                         fc_host->devloss_work_q_name);
 455         if (!fc_host->devloss_work_q) {
 456                 destroy_workqueue(fc_host->work_q);
 457                 fc_host->work_q = NULL;
 458                 return -ENOMEM;
 459         }
 460
 461         fc_bsg_hostadd(shost, fc_host);
 462         /* ignore any bsg add error - we just can't do sgio */
 463
 464         return 0;
 465 }
 466
 467 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 468                          struct device *cdev)
 469 {
 470         struct Scsi_Host *shost = dev_to_shost(dev);
 471         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 472
 473         fc_bsg_remove(fc_host->rqst_q);
 474         return 0;
 475 }
 476
 477 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 478                                "fc_host",
 479                                fc_host_setup,
 480                                fc_host_remove,
 481                                NULL);
 482
 483 /*
 484  * Setup and Remove actions for remote ports are handled
 485  * in the service functions below.
 486  */
 487 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 488                                "fc_remote_ports",
 489                                NULL,
 490                                NULL,
 491                                NULL);
 492
 493 /*
 494  * Setup and Remove actions for virtual ports are handled
 495  * in the service functions below.
 496  */
 497 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 498                                "fc_vports",
 499                                NULL,
 500                                NULL,
 501                                NULL);
 502
 503 /*
 504  * Netlink Infrastructure
 505  */
 506
 507 static atomic_t fc_event_seq;
 508
 509 /**
 510  * fc_get_event_number - Obtain the next sequential FC event number
 511  *
 512  * Notes:
 513  *   We could have inlined this, but it would have required fc_event_seq to
 514  *   be exposed. For now, live with the subroutine call.
 515  *   Atomic used to avoid lock/unlock...
 516  */
 517 u32
 518 fc_get_event_number(void)
 519 {
 520         return atomic_add_return(1, &fc_event_seq);
 521 }
 522 EXPORT_SYMBOL(fc_get_event_number);
 523
 524 /**
 525  * fc_host_post_fc_event - routine to do the work of posting an event
 526  *                      on an fc_host.
 527  * @shost:              host the event occurred on
 528  * @event_number:       fc event number obtained from get_fc_event_number()
 529  * @event_code:         fc_host event being posted
 530  * @data_len:           amount, in bytes, of event data
 531  * @data_buf:           pointer to event data
 532  * @vendor_id:          value for Vendor id
 533  *
 534  * Notes:
 535  *      This routine assumes no locks are held on entry.
 536  */
 537 void
 538 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
 539                 enum fc_host_event_code event_code,
 540                 u32 data_len, char *data_buf, u64 vendor_id)
 541 {
 542         struct sk_buff *skb;
 543         struct nlmsghdr *nlh;
 544         struct fc_nl_event *event;
 545         const char *name;
 546         u32 len;
 547         int err;
 548
 549         if (!data_buf || data_len < 4)
 550                 data_len = 0;
 551
 552         if (!scsi_nl_sock) {
 553                 err = -ENOENT;
 554                 goto send_fail;
 555         }
 556
 557         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 558
 559         skb = nlmsg_new(len, GFP_KERNEL);
 560         if (!skb) {
 561                 err = -ENOBUFS;
 562                 goto send_fail;
 563         }
 564
 565         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
 566         if (!nlh) {
 567                 err = -ENOBUFS;
 568                 goto send_fail_skb;
 569         }
 570         event = nlmsg_data(nlh);
 571
 572         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 573                                 FC_NL_ASYNC_EVENT, len);
 574         event->seconds = ktime_get_real_seconds();
 575         event->vendor_id = vendor_id;
 576         event->host_no = shost->host_no;
 577         event->event_datalen = data_len;        /* bytes */
 578         event->event_num = event_number;
 579         event->event_code = event_code;
 580         if (data_len)
 581                 memcpy(&event->event_data, data_buf, data_len);
 582
 583         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 584                         GFP_KERNEL);
 585         return;
 586
 587 send_fail_skb:
 588         kfree_skb(skb);
 589 send_fail:
 590         name = get_fc_host_event_code_name(event_code);
 591         printk(KERN_WARNING
 592                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 593                 __func__, shost->host_no,
 594                 (name) ? name : "<unknown>",
 595                 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
 596         return;
 597 }
 598 EXPORT_SYMBOL(fc_host_post_fc_event);
 599
 600 /**
 601  * fc_host_post_event - called to post an even on an fc_host.
 602  * @shost:              host the event occurred on
 603  * @event_number:       fc event number obtained from get_fc_event_number()
 604  * @event_code:         fc_host event being posted
 605  * @event_data:         32bits of data for the event being posted
 606  *
 607  * Notes:
 608  *      This routine assumes no locks are held on entry.
 609  */
 610 void
 611 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 612                 enum fc_host_event_code event_code, u32 event_data)
 613 {
 614         fc_host_post_fc_event(shost, event_number, event_code,
 615                 (u32)sizeof(u32), (char *)&event_data, 0);
 616 }
 617 EXPORT_SYMBOL(fc_host_post_event);
 618
 619
 620 /**
 621  * fc_host_post_vendor_event - called to post a vendor unique event
 622  *                      on an fc_host
 623  * @shost:              host the event occurred on
 624  * @event_number:       fc event number obtained from get_fc_event_number()
 625  * @data_len:           amount, in bytes, of vendor unique data
 626  * @data_buf:           pointer to vendor unique data
 627  * @vendor_id:          Vendor id
 628  *
 629  * Notes:
 630  *      This routine assumes no locks are held on entry.
 631  */
 632 void
 633 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 634                 u32 data_len, char * data_buf, u64 vendor_id)
 635 {
 636         fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
 637                 data_len, data_buf, vendor_id);
 638 }
 639 EXPORT_SYMBOL(fc_host_post_vendor_event);
 640
 641 /**
 642  * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
 643  * @shost:              host the fc_rport is associated with
 644  * @wwpn:               wwpn of the fc_rport device
 645  *
 646  * Notes:
 647  *      This routine assumes no locks are held on entry.
 648  */
 649 struct fc_rport *
 650 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
 651 {
 652         struct fc_rport *rport;
 653         unsigned long flags;
 654
 655         spin_lock_irqsave(shost->host_lock, flags);
 656
 657         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
 658                 if (rport->port_state != FC_PORTSTATE_ONLINE)
 659                         continue;
 660
 661                 if (rport->port_name == wwpn) {
 662                         spin_unlock_irqrestore(shost->host_lock, flags);
 663                         return rport;
 664                 }
 665         }
 666
 667         spin_unlock_irqrestore(shost->host_lock, flags);
 668         return NULL;
 669 }
 670 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
 671
 672 static void
 673 fc_li_stats_update(u16 event_type,
 674                    struct fc_fpin_stats *stats)
 675 {
 676         stats->li++;
 677         switch (event_type) {
 678         case FPIN_LI_UNKNOWN:
 679                 stats->li_failure_unknown++;
 680                 break;
 681         case FPIN_LI_LINK_FAILURE:
 682                 stats->li_link_failure_count++;
 683                 break;
 684         case FPIN_LI_LOSS_OF_SYNC:
 685                 stats->li_loss_of_sync_count++;
 686                 break;
 687         case FPIN_LI_LOSS_OF_SIG:
 688                 stats->li_loss_of_signals_count++;
 689                 break;
 690         case FPIN_LI_PRIM_SEQ_ERR:
 691                 stats->li_prim_seq_err_count++;
 692                 break;
 693         case FPIN_LI_INVALID_TX_WD:
 694                 stats->li_invalid_tx_word_count++;
 695                 break;
 696         case FPIN_LI_INVALID_CRC:
 697                 stats->li_invalid_crc_count++;
 698                 break;
 699         case FPIN_LI_DEVICE_SPEC:
 700                 stats->li_device_specific++;
 701                 break;
 702         }
 703 }
 704
 705 static void
 706 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
 707 {
 708         stats->dn++;
 709         switch (reason_code) {
 710         case FPIN_DELI_UNKNOWN:
 711                 stats->dn_unknown++;
 712                 break;
 713         case FPIN_DELI_TIMEOUT:
 714                 stats->dn_timeout++;
 715                 break;
 716         case FPIN_DELI_UNABLE_TO_ROUTE:
 717                 stats->dn_unable_to_route++;
 718                 break;
 719         case FPIN_DELI_DEVICE_SPEC:
 720                 stats->dn_device_specific++;
 721                 break;
 722         }
 723 }
 724
 725 static void
 726 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
 727 {
 728         stats->cn++;
 729         switch (event_type) {
 730         case FPIN_CONGN_CLEAR:
 731                 stats->cn_clear++;
 732                 break;
 733         case FPIN_CONGN_LOST_CREDIT:
 734                 stats->cn_lost_credit++;
 735                 break;
 736         case FPIN_CONGN_CREDIT_STALL:
 737                 stats->cn_credit_stall++;
 738                 break;
 739         case FPIN_CONGN_OVERSUBSCRIPTION:
 740                 stats->cn_oversubscription++;
 741                 break;
 742         case FPIN_CONGN_DEVICE_SPEC:
 743                 stats->cn_device_specific++;
 744         }
 745 }
 746
 747 /*
 748  * fc_fpin_li_stats_update - routine to update Link Integrity
 749  * event statistics.
 750  * @shost:              host the FPIN was received on
 751  * @tlv:                pointer to link integrity descriptor
 752  *
 753  */
 754 static void
 755 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
 756 {
 757         u8 i;
 758         struct fc_rport *rport = NULL;
 759         struct fc_rport *attach_rport = NULL;
 760         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 761         struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
 762         u16 event_type = be16_to_cpu(li_desc->event_type);
 763         u64 wwpn;
 764
 765         rport = fc_find_rport_by_wwpn(shost,
 766                                       be64_to_cpu(li_desc->attached_wwpn));
 767         if (rport &&
 768             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 769              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 770                 attach_rport = rport;
 771                 fc_li_stats_update(event_type, &attach_rport->fpin_stats);
 772         }
 773
 774         if (be32_to_cpu(li_desc->pname_count) > 0) {
 775                 for (i = 0;
 776                     i < be32_to_cpu(li_desc->pname_count);
 777                     i++) {
 778                         wwpn = be64_to_cpu(li_desc->pname_list[i]);
 779                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 780                         if (rport &&
 781                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 782                             rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 783                                 if (rport == attach_rport)
 784                                         continue;
 785                                 fc_li_stats_update(event_type,
 786                                                    &rport->fpin_stats);
 787                         }
 788                 }
 789         }
 790
 791         if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
 792                 fc_li_stats_update(event_type, &fc_host->fpin_stats);
 793 }
 794
 795 /*
 796  * fc_fpin_delivery_stats_update - routine to update Delivery Notification
 797  * event statistics.
 798  * @shost:              host the FPIN was received on
 799  * @tlv:                pointer to delivery descriptor
 800  *
 801  */
 802 static void
 803 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
 804                               struct fc_tlv_desc *tlv)
 805 {
 806         struct fc_rport *rport = NULL;
 807         struct fc_rport *attach_rport = NULL;
 808         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 809         struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
 810         u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
 811
 812         rport = fc_find_rport_by_wwpn(shost,
 813                                       be64_to_cpu(dn_desc->attached_wwpn));
 814         if (rport &&
 815             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 816              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 817                 attach_rport = rport;
 818                 fc_delivery_stats_update(reason_code,
 819                                          &attach_rport->fpin_stats);
 820         }
 821
 822         if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
 823                 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
 824 }
 825
 826 /*
 827  * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
 828  * event statistics.
 829  * @shost:              host the FPIN was received on
 830  * @tlv:                pointer to peer congestion descriptor
 831  *
 832  */
 833 static void
 834 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
 835                                 struct fc_tlv_desc *tlv)
 836 {
 837         u8 i;
 838         struct fc_rport *rport = NULL;
 839         struct fc_rport *attach_rport = NULL;
 840         struct fc_fn_peer_congn_desc *pc_desc =
 841             (struct fc_fn_peer_congn_desc *)tlv;
 842         u16 event_type = be16_to_cpu(pc_desc->event_type);
 843         u64 wwpn;
 844
 845         rport = fc_find_rport_by_wwpn(shost,
 846                                       be64_to_cpu(pc_desc->attached_wwpn));
 847         if (rport &&
 848             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 849              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 850                 attach_rport = rport;
 851                 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
 852         }
 853
 854         if (be32_to_cpu(pc_desc->pname_count) > 0) {
 855                 for (i = 0;
 856                     i < be32_to_cpu(pc_desc->pname_count);
 857                     i++) {
 858                         wwpn = be64_to_cpu(pc_desc->pname_list[i]);
 859                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 860                         if (rport &&
 861                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 862                              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 863                                 if (rport == attach_rport)
 864                                         continue;
 865                                 fc_cn_stats_update(event_type,
 866                                                    &rport->fpin_stats);
 867                         }
 868                 }
 869         }
 870 }
 871
 872 /*
 873  * fc_fpin_congn_stats_update - routine to update Congestion
 874  * event statistics.
 875  * @shost:              host the FPIN was received on
 876  * @tlv:                pointer to congestion descriptor
 877  *
 878  */
 879 static void
 880 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
 881                            struct fc_tlv_desc *tlv)
 882 {
 883         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 884         struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
 885
 886         fc_cn_stats_update(be16_to_cpu(congn->event_type),
 887                            &fc_host->fpin_stats);
 888 }
 889
 890 /**
 891  * fc_host_fpin_rcv - routine to process a received FPIN.
 892  * @shost:              host the FPIN was received on
 893  * @fpin_len:           length of FPIN payload, in bytes
 894  * @fpin_buf:           pointer to FPIN payload
 895  *
 896  * Notes:
 897  *      This routine assumes no locks are held on entry.
 898  */
 899 void
 900 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
 901 {
 902         struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
 903         struct fc_tlv_desc *tlv;
 904         u32 desc_cnt = 0, bytes_remain;
 905         u32 dtag;
 906
 907         /* Update Statistics */
 908         tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
 909         bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
 910         bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
 911
 912         while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
 913                bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
 914                 dtag = be32_to_cpu(tlv->desc_tag);
 915                 switch (dtag) {
 916                 case ELS_DTAG_LNK_INTEGRITY:
 917                         fc_fpin_li_stats_update(shost, tlv);
 918                         break;
 919                 case ELS_DTAG_DELIVERY:
 920                         fc_fpin_delivery_stats_update(shost, tlv);
 921                         break;
 922                 case ELS_DTAG_PEER_CONGEST:
 923                         fc_fpin_peer_congn_stats_update(shost, tlv);
 924                         break;
 925                 case ELS_DTAG_CONGESTION:
 926                         fc_fpin_congn_stats_update(shost, tlv);
 927                 }
 928
 929                 desc_cnt++;
 930                 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
 931                 tlv = fc_tlv_next_desc(tlv);
 932         }
 933
 934         fc_host_post_fc_event(shost, fc_get_event_number(),
 935                                 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
 936 }
 937 EXPORT_SYMBOL(fc_host_fpin_rcv);
 938
 939
 940 static __init int fc_transport_init(void)
 941 {
 942         int error;
 943
 944         atomic_set(&fc_event_seq, 0);
 945
 946         error = transport_class_register(&fc_host_class);
 947         if (error)
 948                 return error;
 949         error = transport_class_register(&fc_vport_class);
 950         if (error)
 951                 goto unreg_host_class;
 952         error = transport_class_register(&fc_rport_class);
 953         if (error)
 954                 goto unreg_vport_class;
 955         error = transport_class_register(&fc_transport_class);
 956         if (error)
 957                 goto unreg_rport_class;
 958         return 0;
 959
 960 unreg_rport_class:
 961         transport_class_unregister(&fc_rport_class);
 962 unreg_vport_class:
 963         transport_class_unregister(&fc_vport_class);
 964 unreg_host_class:
 965         transport_class_unregister(&fc_host_class);
 966         return error;
 967 }
 968
 969 static void __exit fc_transport_exit(void)
 970 {
 971         transport_class_unregister(&fc_transport_class);
 972         transport_class_unregister(&fc_rport_class);
 973         transport_class_unregister(&fc_host_class);
 974         transport_class_unregister(&fc_vport_class);
 975 }
 976
 977 /*
 978  * FC Remote Port Attribute Management
 979  */
 980
 981 #define fc_rport_show_function(field, format_string, sz, cast)          \
 982 static ssize_t                                                          \
 983 show_fc_rport_##field (struct device *dev,                              \
 984                        struct device_attribute *attr, char *buf)        \
 985 {                                                                       \
 986         struct fc_rport *rport = transport_class_to_rport(dev);         \
 987         struct Scsi_Host *shost = rport_to_shost(rport);                \
 988         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 989         if ((i->f->get_rport_##field) &&                                \
 990             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 991               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 992               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 993                 i->f->get_rport_##field(rport);                         \
 994         return snprintf(buf, sz, format_string, cast rport->field);     \
 995 }
 996
 997 #define fc_rport_store_function(field)                                  \
 998 static ssize_t                                                          \
 999 store_fc_rport_##field(struct device *dev,                              \
1000                        struct device_attribute *attr,                   \
1001                        const char *buf, size_t count)                   \
1002 {                                                                       \
1003         int val;                                                        \
1004         struct fc_rport *rport = transport_class_to_rport(dev);         \
1005         struct Scsi_Host *shost = rport_to_shost(rport);                \
1006         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1007         char *cp;                                                       \
1008         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
1009             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
1010             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
1011                 return -EBUSY;                                          \
1012         val = simple_strtoul(buf, &cp, 0);                              \
1013         if (*cp && (*cp != '\n'))                                       \
1014                 return -EINVAL;                                         \
1015         i->f->set_rport_##field(rport, val);                            \
1016         return count;                                                   \
1017 }
1018
1019 #define fc_rport_rd_attr(field, format_string, sz)                      \
1020         fc_rport_show_function(field, format_string, sz, )              \
1021 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1022                          show_fc_rport_##field, NULL)
1023
1024 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
1025         fc_rport_show_function(field, format_string, sz, (cast))        \
1026 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1027                           show_fc_rport_##field, NULL)
1028
1029 #define fc_rport_rw_attr(field, format_string, sz)                      \
1030         fc_rport_show_function(field, format_string, sz, )              \
1031         fc_rport_store_function(field)                                  \
1032 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
1033                         show_fc_rport_##field,                          \
1034                         store_fc_rport_##field)
1035
1036
1037 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
1038 static ssize_t                                                          \
1039 show_fc_rport_##field (struct device *dev,                              \
1040                        struct device_attribute *attr, char *buf)        \
1041 {                                                                       \
1042         struct fc_rport *rport = transport_class_to_rport(dev);         \
1043         return snprintf(buf, sz, format_string, cast rport->field);     \
1044 }
1045
1046 #define fc_private_rport_rd_attr(field, format_string, sz)              \
1047         fc_private_rport_show_function(field, format_string, sz, )      \
1048 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1049                          show_fc_rport_##field, NULL)
1050
1051 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
1052         fc_private_rport_show_function(field, format_string, sz, (cast)) \
1053 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1054                           show_fc_rport_##field, NULL)
1055
1056
1057 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
1058 static ssize_t                                                          \
1059 show_fc_rport_##title (struct device *dev,                              \
1060                        struct device_attribute *attr, char *buf)        \
1061 {                                                                       \
1062         struct fc_rport *rport = transport_class_to_rport(dev);         \
1063         const char *name;                                               \
1064         name = get_fc_##title##_name(rport->title);                     \
1065         if (!name)                                                      \
1066                 return -EINVAL;                                         \
1067         return snprintf(buf, maxlen, "%s\n", name);                     \
1068 }                                                                       \
1069 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
1070                         show_fc_rport_##title, NULL)
1071
1072
1073 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
1074         i->private_rport_attrs[count] = device_attr_rport_##field; \
1075         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1076         i->private_rport_attrs[count].store = NULL;                     \
1077         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1078         if (i->f->show_rport_##field)                                   \
1079                 count++
1080
1081 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
1082         i->private_rport_attrs[count] = device_attr_rport_##field; \
1083         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1084         i->private_rport_attrs[count].store = NULL;                     \
1085         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1086         count++
1087
1088 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
1089         i->private_rport_attrs[count] = device_attr_rport_##field; \
1090         if (!i->f->set_rport_##field) {                                 \
1091                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
1092                 i->private_rport_attrs[count].store = NULL;             \
1093         }                                                               \
1094         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1095         if (i->f->show_rport_##field)                                   \
1096                 count++
1097
1098 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
1099 {                                                                       \
1100         i->private_rport_attrs[count] = device_attr_rport_##field; \
1101         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1102         count++;                                                        \
1103 }
1104
1105
1106 /* The FC Transport Remote Port Attributes: */
1107
1108 /* Fixed Remote Port Attributes */
1109
1110 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1111
1112 static ssize_t
1113 show_fc_rport_supported_classes (struct device *dev,
1114                                  struct device_attribute *attr, char *buf)
1115 {
1116         struct fc_rport *rport = transport_class_to_rport(dev);
1117         if (rport->supported_classes == FC_COS_UNSPECIFIED)
1118                 return snprintf(buf, 20, "unspecified\n");
1119         return get_fc_cos_names(rport->supported_classes, buf);
1120 }
1121 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1122                 show_fc_rport_supported_classes, NULL);
1123
1124 /* Dynamic Remote Port Attributes */
1125
1126 /*
1127  * dev_loss_tmo attribute
1128  */
1129 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1130 {
1131         char *cp;
1132
1133         *val = simple_strtoul(buf, &cp, 0);
1134         if (*cp && (*cp != '\n'))
1135                 return -EINVAL;
1136         /*
1137          * Check for overflow; dev_loss_tmo is u32
1138          */
1139         if (*val > UINT_MAX)
1140                 return -EINVAL;
1141
1142         return 0;
1143 }
1144
1145 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1146                                      unsigned long val)
1147 {
1148         struct Scsi_Host *shost = rport_to_shost(rport);
1149         struct fc_internal *i = to_fc_internal(shost->transportt);
1150
1151         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1152             (rport->port_state == FC_PORTSTATE_DELETED) ||
1153             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1154                 return -EBUSY;
1155         /*
1156          * Check for overflow; dev_loss_tmo is u32
1157          */
1158         if (val > UINT_MAX)
1159                 return -EINVAL;
1160
1161         /*
1162          * If fast_io_fail is off we have to cap
1163          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1164          */
1165         if (rport->fast_io_fail_tmo == -1 &&
1166             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1167                 return -EINVAL;
1168
1169         i->f->set_rport_dev_loss_tmo(rport, val);
1170         return 0;
1171 }
1172
1173 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
1174 static ssize_t
1175 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1176                             const char *buf, size_t count)
1177 {
1178         struct fc_rport *rport = transport_class_to_rport(dev);
1179         unsigned long val;
1180         int rc;
1181
1182         rc = fc_str_to_dev_loss(buf, &val);
1183         if (rc)
1184                 return rc;
1185
1186         rc = fc_rport_set_dev_loss_tmo(rport, val);
1187         if (rc)
1188                 return rc;
1189         return count;
1190 }
1191 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1192                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1193
1194
1195 /* Private Remote Port Attributes */
1196
1197 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1198 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1199 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1200
1201 static ssize_t
1202 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1203                      char *buf)
1204 {
1205         struct fc_rport *rport = transport_class_to_rport(dev);
1206
1207         /* identify any roles that are port_id specific */
1208         if ((rport->port_id != -1) &&
1209             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1210                                         FC_WELLKNOWN_PORTID_MASK) {
1211                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1212                 case FC_FPORT_PORTID:
1213                         return snprintf(buf, 30, "Fabric Port\n");
1214                 case FC_FABCTLR_PORTID:
1215                         return snprintf(buf, 30, "Fabric Controller\n");
1216                 case FC_DIRSRVR_PORTID:
1217                         return snprintf(buf, 30, "Directory Server\n");
1218                 case FC_TIMESRVR_PORTID:
1219                         return snprintf(buf, 30, "Time Server\n");
1220                 case FC_MGMTSRVR_PORTID:
1221                         return snprintf(buf, 30, "Management Server\n");
1222                 default:
1223                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
1224                 }
1225         } else {
1226                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1227                         return snprintf(buf, 20, "unknown\n");
1228                 return get_fc_port_roles_names(rport->roles, buf);
1229         }
1230 }
1231 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1232                 show_fc_rport_roles, NULL);
1233
1234 static ssize_t fc_rport_set_marginal_state(struct device *dev,
1235                                                 struct device_attribute *attr,
1236                                                 const char *buf, size_t count)
1237 {
1238         struct fc_rport *rport = transport_class_to_rport(dev);
1239         enum fc_port_state port_state;
1240         int ret = 0;
1241
1242         ret = get_fc_port_state_match(buf, &port_state);
1243         if (ret)
1244                 return -EINVAL;
1245         if (port_state == FC_PORTSTATE_MARGINAL) {
1246                 /*
1247                  * Change the state to Marginal only if the
1248                  * current rport state is Online
1249                  * Allow only Online->Marginal
1250                  */
1251                 if (rport->port_state == FC_PORTSTATE_ONLINE)
1252                         rport->port_state = port_state;
1253                 else
1254                         return -EINVAL;
1255         } else if (port_state == FC_PORTSTATE_ONLINE) {
1256                 /*
1257                  * Change the state to Online only if the
1258                  * current rport state is Marginal
1259                  * Allow only Marginal->Online
1260                  */
1261                 if (rport->port_state == FC_PORTSTATE_MARGINAL)
1262                         rport->port_state = port_state;
1263                 else
1264                         return -EINVAL;
1265         } else
1266                 return -EINVAL;
1267         return count;
1268 }
1269
1270 static ssize_t
1271 show_fc_rport_port_state(struct device *dev,
1272                                 struct device_attribute *attr, char *buf)
1273 {
1274         const char *name;
1275         struct fc_rport *rport = transport_class_to_rport(dev);
1276
1277         name = get_fc_port_state_name(rport->port_state);
1278         if (!name)
1279                 return -EINVAL;
1280
1281         return snprintf(buf, 20, "%s\n", name);
1282 }
1283
1284 static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1285                         show_fc_rport_port_state, fc_rport_set_marginal_state);
1286
1287 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1288
1289 /*
1290  * fast_io_fail_tmo attribute
1291  */
1292 static ssize_t
1293 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1294                                 struct device_attribute *attr, char *buf)
1295 {
1296         struct fc_rport *rport = transport_class_to_rport(dev);
1297
1298         if (rport->fast_io_fail_tmo == -1)
1299                 return snprintf(buf, 5, "off\n");
1300         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1301 }
1302
1303 static ssize_t
1304 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1305                                 struct device_attribute *attr, const char *buf,
1306                                 size_t count)
1307 {
1308         int val;
1309         char *cp;
1310         struct fc_rport *rport = transport_class_to_rport(dev);
1311
1312         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1313             (rport->port_state == FC_PORTSTATE_DELETED) ||
1314             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1315                 return -EBUSY;
1316         if (strncmp(buf, "off", 3) == 0)
1317                 rport->fast_io_fail_tmo = -1;
1318         else {
1319                 val = simple_strtoul(buf, &cp, 0);
1320                 if ((*cp && (*cp != '\n')) || (val < 0))
1321                         return -EINVAL;
1322                 /*
1323                  * Cap fast_io_fail by dev_loss_tmo or
1324                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1325                  */
1326                 if ((val >= rport->dev_loss_tmo) ||
1327                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1328                         return -EINVAL;
1329
1330                 rport->fast_io_fail_tmo = val;
1331         }
1332         return count;
1333 }
1334 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1335         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1336
1337 #define fc_rport_fpin_statistic(name)                                   \
1338 static ssize_t fc_rport_fpinstat_##name(struct device *cd,              \
1339                                   struct device_attribute *attr,        \
1340                                   char *buf)                            \
1341 {                                                                       \
1342         struct fc_rport *rport = transport_class_to_rport(cd);          \
1343                                                                         \
1344         return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name);   \
1345 }                                                                       \
1346 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1347
1348 fc_rport_fpin_statistic(dn);
1349 fc_rport_fpin_statistic(dn_unknown);
1350 fc_rport_fpin_statistic(dn_timeout);
1351 fc_rport_fpin_statistic(dn_unable_to_route);
1352 fc_rport_fpin_statistic(dn_device_specific);
1353 fc_rport_fpin_statistic(cn);
1354 fc_rport_fpin_statistic(cn_clear);
1355 fc_rport_fpin_statistic(cn_lost_credit);
1356 fc_rport_fpin_statistic(cn_credit_stall);
1357 fc_rport_fpin_statistic(cn_oversubscription);
1358 fc_rport_fpin_statistic(cn_device_specific);
1359 fc_rport_fpin_statistic(li);
1360 fc_rport_fpin_statistic(li_failure_unknown);
1361 fc_rport_fpin_statistic(li_link_failure_count);
1362 fc_rport_fpin_statistic(li_loss_of_sync_count);
1363 fc_rport_fpin_statistic(li_loss_of_signals_count);
1364 fc_rport_fpin_statistic(li_prim_seq_err_count);
1365 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1366 fc_rport_fpin_statistic(li_invalid_crc_count);
1367 fc_rport_fpin_statistic(li_device_specific);
1368
1369 static struct attribute *fc_rport_statistics_attrs[] = {
1370         &device_attr_rport_fpin_dn.attr,
1371         &device_attr_rport_fpin_dn_unknown.attr,
1372         &device_attr_rport_fpin_dn_timeout.attr,
1373         &device_attr_rport_fpin_dn_unable_to_route.attr,
1374         &device_attr_rport_fpin_dn_device_specific.attr,
1375         &device_attr_rport_fpin_li.attr,
1376         &device_attr_rport_fpin_li_failure_unknown.attr,
1377         &device_attr_rport_fpin_li_link_failure_count.attr,
1378         &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1379         &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1380         &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1381         &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1382         &device_attr_rport_fpin_li_invalid_crc_count.attr,
1383         &device_attr_rport_fpin_li_device_specific.attr,
1384         &device_attr_rport_fpin_cn.attr,
1385         &device_attr_rport_fpin_cn_clear.attr,
1386         &device_attr_rport_fpin_cn_lost_credit.attr,
1387         &device_attr_rport_fpin_cn_credit_stall.attr,
1388         &device_attr_rport_fpin_cn_oversubscription.attr,
1389         &device_attr_rport_fpin_cn_device_specific.attr,
1390         NULL
1391 };
1392
1393 static struct attribute_group fc_rport_statistics_group = {
1394         .name = "statistics",
1395         .attrs = fc_rport_statistics_attrs,
1396 };
1397
1398
1399 /*
1400  * FC SCSI Target Attribute Management
1401  */
1402
1403 /*
1404  * Note: in the target show function we recognize when the remote
1405  *  port is in the hierarchy and do not allow the driver to get
1406  *  involved in sysfs functions. The driver only gets involved if
1407  *  it's the "old" style that doesn't use rports.
1408  */
1409 #define fc_starget_show_function(field, format_string, sz, cast)        \
1410 static ssize_t                                                          \
1411 show_fc_starget_##field (struct device *dev,                            \
1412                          struct device_attribute *attr, char *buf)      \
1413 {                                                                       \
1414         struct scsi_target *starget = transport_class_to_starget(dev);  \
1415         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1416         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1417         struct fc_rport *rport = starget_to_rport(starget);             \
1418         if (rport)                                                      \
1419                 fc_starget_##field(starget) = rport->field;             \
1420         else if (i->f->get_starget_##field)                             \
1421                 i->f->get_starget_##field(starget);                     \
1422         return snprintf(buf, sz, format_string,                         \
1423                 cast fc_starget_##field(starget));                      \
1424 }
1425
1426 #define fc_starget_rd_attr(field, format_string, sz)                    \
1427         fc_starget_show_function(field, format_string, sz, )            \
1428 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1429                          show_fc_starget_##field, NULL)
1430
1431 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1432         fc_starget_show_function(field, format_string, sz, (cast))      \
1433 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1434                           show_fc_starget_##field, NULL)
1435
1436 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1437         i->private_starget_attrs[count] = device_attr_starget_##field; \
1438         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1439         i->private_starget_attrs[count].store = NULL;                   \
1440         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1441         if (i->f->show_starget_##field)                                 \
1442                 count++
1443
1444 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1445         i->private_starget_attrs[count] = device_attr_starget_##field; \
1446         if (!i->f->set_starget_##field) {                               \
1447                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1448                 i->private_starget_attrs[count].store = NULL;           \
1449         }                                                               \
1450         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1451         if (i->f->show_starget_##field)                                 \
1452                 count++
1453
1454 /* The FC Transport SCSI Target Attributes: */
1455 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1456 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1457 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1458
1459
1460 /*
1461  * FC Virtual Port Attribute Management
1462  */
1463
1464 #define fc_vport_show_function(field, format_string, sz, cast)          \
1465 static ssize_t                                                          \
1466 show_fc_vport_##field (struct device *dev,                              \
1467                        struct device_attribute *attr, char *buf)        \
1468 {                                                                       \
1469         struct fc_vport *vport = transport_class_to_vport(dev);         \
1470         struct Scsi_Host *shost = vport_to_shost(vport);                \
1471         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1472         if ((i->f->get_vport_##field) &&                                \
1473             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1474                 i->f->get_vport_##field(vport);                         \
1475         return snprintf(buf, sz, format_string, cast vport->field);     \
1476 }
1477
1478 #define fc_vport_store_function(field)                                  \
1479 static ssize_t                                                          \
1480 store_fc_vport_##field(struct device *dev,                              \
1481                        struct device_attribute *attr,                   \
1482                        const char *buf, size_t count)                   \
1483 {                                                                       \
1484         int val;                                                        \
1485         struct fc_vport *vport = transport_class_to_vport(dev);         \
1486         struct Scsi_Host *shost = vport_to_shost(vport);                \
1487         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1488         char *cp;                                                       \
1489         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1490                 return -EBUSY;                                          \
1491         val = simple_strtoul(buf, &cp, 0);                              \
1492         if (*cp && (*cp != '\n'))                                       \
1493                 return -EINVAL;                                         \
1494         i->f->set_vport_##field(vport, val);                            \
1495         return count;                                                   \
1496 }
1497
1498 #define fc_vport_store_str_function(field, slen)                        \
1499 static ssize_t                                                          \
1500 store_fc_vport_##field(struct device *dev,                              \
1501                        struct device_attribute *attr,                   \
1502                        const char *buf, size_t count)                   \
1503 {                                                                       \
1504         struct fc_vport *vport = transport_class_to_vport(dev);         \
1505         struct Scsi_Host *shost = vport_to_shost(vport);                \
1506         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1507         unsigned int cnt=count;                                         \
1508                                                                         \
1509         /* count may include a LF at end of string */                   \
1510         if (buf[cnt-1] == '\n')                                         \
1511                 cnt--;                                                  \
1512         if (cnt > ((slen) - 1))                                         \
1513                 return -EINVAL;                                         \
1514         memcpy(vport->field, buf, cnt);                                 \
1515         i->f->set_vport_##field(vport);                                 \
1516         return count;                                                   \
1517 }
1518
1519 #define fc_vport_rd_attr(field, format_string, sz)                      \
1520         fc_vport_show_function(field, format_string, sz, )              \
1521 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1522                          show_fc_vport_##field, NULL)
1523
1524 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1525         fc_vport_show_function(field, format_string, sz, (cast))        \
1526 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1527                           show_fc_vport_##field, NULL)
1528
1529 #define fc_vport_rw_attr(field, format_string, sz)                      \
1530         fc_vport_show_function(field, format_string, sz, )              \
1531         fc_vport_store_function(field)                                  \
1532 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1533                         show_fc_vport_##field,                          \
1534                         store_fc_vport_##field)
1535
1536 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1537 static ssize_t                                                          \
1538 show_fc_vport_##field (struct device *dev,                              \
1539                        struct device_attribute *attr, char *buf)        \
1540 {                                                                       \
1541         struct fc_vport *vport = transport_class_to_vport(dev);         \
1542         return snprintf(buf, sz, format_string, cast vport->field);     \
1543 }
1544
1545 #define fc_private_vport_store_u32_function(field)                      \
1546 static ssize_t                                                          \
1547 store_fc_vport_##field(struct device *dev,                              \
1548                        struct device_attribute *attr,                   \
1549                        const char *buf, size_t count)                   \
1550 {                                                                       \
1551         u32 val;                                                        \
1552         struct fc_vport *vport = transport_class_to_vport(dev);         \
1553         char *cp;                                                       \
1554         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1555                 return -EBUSY;                                          \
1556         val = simple_strtoul(buf, &cp, 0);                              \
1557         if (*cp && (*cp != '\n'))                                       \
1558                 return -EINVAL;                                         \
1559         vport->field = val;                                             \
1560         return count;                                                   \
1561 }
1562
1563
1564 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1565         fc_private_vport_show_function(field, format_string, sz, )      \
1566 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1567                          show_fc_vport_##field, NULL)
1568
1569 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1570         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1571 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1572                           show_fc_vport_##field, NULL)
1573
1574 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1575         fc_private_vport_show_function(field, format_string, sz, )      \
1576         fc_private_vport_store_u32_function(field)                      \
1577 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1578                         show_fc_vport_##field,                          \
1579                         store_fc_vport_##field)
1580
1581
1582 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1583 static ssize_t                                                          \
1584 show_fc_vport_##title (struct device *dev,                              \
1585                        struct device_attribute *attr,                   \
1586                        char *buf)                                       \
1587 {                                                                       \
1588         struct fc_vport *vport = transport_class_to_vport(dev);         \
1589         const char *name;                                               \
1590         name = get_fc_##title##_name(vport->title);                     \
1591         if (!name)                                                      \
1592                 return -EINVAL;                                         \
1593         return snprintf(buf, maxlen, "%s\n", name);                     \
1594 }                                                                       \
1595 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1596                         show_fc_vport_##title, NULL)
1597
1598
1599 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1600         i->private_vport_attrs[count] = device_attr_vport_##field; \
1601         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1602         i->private_vport_attrs[count].store = NULL;                     \
1603         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1604         if (i->f->get_##field)                                          \
1605                 count++
1606         /* NOTE: Above MACRO differs: checks function not show bit */
1607
1608 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1609         i->private_vport_attrs[count] = device_attr_vport_##field; \
1610         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1611         i->private_vport_attrs[count].store = NULL;                     \
1612         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1613         count++
1614
1615 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1616         i->private_vport_attrs[count] = device_attr_vport_##field; \
1617         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1618         if (i->f->field)                                                \
1619                 count++
1620         /* NOTE: Above MACRO differs: checks function */
1621
1622 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1623         i->private_vport_attrs[count] = device_attr_vport_##field; \
1624         if (!i->f->set_vport_##field) {                                 \
1625                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1626                 i->private_vport_attrs[count].store = NULL;             \
1627         }                                                               \
1628         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1629         count++
1630         /* NOTE: Above MACRO differs: does not check show bit */
1631
1632 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1633 {                                                                       \
1634         i->private_vport_attrs[count] = device_attr_vport_##field; \
1635         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1636         count++;                                                        \
1637 }
1638
1639
1640 /* The FC Transport Virtual Port Attributes: */
1641
1642 /* Fixed Virtual Port Attributes */
1643
1644 /* Dynamic Virtual Port Attributes */
1645
1646 /* Private Virtual Port Attributes */
1647
1648 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1649 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1650 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1651 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1652
1653 static ssize_t
1654 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1655                      char *buf)
1656 {
1657         struct fc_vport *vport = transport_class_to_vport(dev);
1658
1659         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1660                 return snprintf(buf, 20, "unknown\n");
1661         return get_fc_port_roles_names(vport->roles, buf);
1662 }
1663 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1664
1665 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1666
1667 fc_private_vport_show_function(symbolic_name, "%s\n",
1668                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1669 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1670 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1671                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1672
1673 static ssize_t
1674 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1675                       const char *buf, size_t count)
1676 {
1677         struct fc_vport *vport = transport_class_to_vport(dev);
1678         struct Scsi_Host *shost = vport_to_shost(vport);
1679         unsigned long flags;
1680
1681         spin_lock_irqsave(shost->host_lock, flags);
1682         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1683                 spin_unlock_irqrestore(shost->host_lock, flags);
1684                 return -EBUSY;
1685         }
1686         vport->flags |= FC_VPORT_DELETING;
1687         spin_unlock_irqrestore(shost->host_lock, flags);
1688
1689         fc_queue_work(shost, &vport->vport_delete_work);
1690         return count;
1691 }
1692 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1693                         NULL, store_fc_vport_delete);
1694
1695
1696 /*
1697  * Enable/Disable vport
1698  *  Write "1" to disable, write "0" to enable
1699  */
1700 static ssize_t
1701 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1702                        const char *buf,
1703                            size_t count)
1704 {
1705         struct fc_vport *vport = transport_class_to_vport(dev);
1706         struct Scsi_Host *shost = vport_to_shost(vport);
1707         struct fc_internal *i = to_fc_internal(shost->transportt);
1708         int stat;
1709
1710         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1711                 return -EBUSY;
1712
1713         if (*buf == '0') {
1714                 if (vport->vport_state != FC_VPORT_DISABLED)
1715                         return -EALREADY;
1716         } else if (*buf == '1') {
1717                 if (vport->vport_state == FC_VPORT_DISABLED)
1718                         return -EALREADY;
1719         } else
1720                 return -EINVAL;
1721
1722         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1723         return stat ? stat : count;
1724 }
1725 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1726                         NULL, store_fc_vport_disable);
1727
1728
1729 /*
1730  * Host Attribute Management
1731  */
1732
1733 #define fc_host_show_function(field, format_string, sz, cast)           \
1734 static ssize_t                                                          \
1735 show_fc_host_##field (struct device *dev,                               \
1736                       struct device_attribute *attr, char *buf)         \
1737 {                                                                       \
1738         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1739         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1740         if (i->f->get_host_##field)                                     \
1741                 i->f->get_host_##field(shost);                          \
1742         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1743 }
1744
1745 #define fc_host_store_function(field)                                   \
1746 static ssize_t                                                          \
1747 store_fc_host_##field(struct device *dev,                               \
1748                       struct device_attribute *attr,                    \
1749                       const char *buf,  size_t count)                   \
1750 {                                                                       \
1751         int val;                                                        \
1752         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1753         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1754         char *cp;                                                       \
1755                                                                         \
1756         val = simple_strtoul(buf, &cp, 0);                              \
1757         if (*cp && (*cp != '\n'))                                       \
1758                 return -EINVAL;                                         \
1759         i->f->set_host_##field(shost, val);                             \
1760         return count;                                                   \
1761 }
1762
1763 #define fc_host_store_str_function(field, slen)                         \
1764 static ssize_t                                                          \
1765 store_fc_host_##field(struct device *dev,                               \
1766                       struct device_attribute *attr,                    \
1767                       const char *buf, size_t count)                    \
1768 {                                                                       \
1769         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1770         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1771         unsigned int cnt=count;                                         \
1772                                                                         \
1773         /* count may include a LF at end of string */                   \
1774         if (buf[cnt-1] == '\n')                                         \
1775                 cnt--;                                                  \
1776         if (cnt > ((slen) - 1))                                         \
1777                 return -EINVAL;                                         \
1778         memcpy(fc_host_##field(shost), buf, cnt);                       \
1779         i->f->set_host_##field(shost);                                  \
1780         return count;                                                   \
1781 }
1782
1783 #define fc_host_rd_attr(field, format_string, sz)                       \
1784         fc_host_show_function(field, format_string, sz, )               \
1785 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1786                          show_fc_host_##field, NULL)
1787
1788 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1789         fc_host_show_function(field, format_string, sz, (cast))         \
1790 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1791                           show_fc_host_##field, NULL)
1792
1793 #define fc_host_rw_attr(field, format_string, sz)                       \
1794         fc_host_show_function(field, format_string, sz, )               \
1795         fc_host_store_function(field)                                   \
1796 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1797                         show_fc_host_##field,                           \
1798                         store_fc_host_##field)
1799
1800 #define fc_host_rd_enum_attr(title, maxlen)                             \
1801 static ssize_t                                                          \
1802 show_fc_host_##title (struct device *dev,                               \
1803                       struct device_attribute *attr, char *buf)         \
1804 {                                                                       \
1805         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1806         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1807         const char *name;                                               \
1808         if (i->f->get_host_##title)                                     \
1809                 i->f->get_host_##title(shost);                          \
1810         name = get_fc_##title##_name(fc_host_##title(shost));           \
1811         if (!name)                                                      \
1812                 return -EINVAL;                                         \
1813         return snprintf(buf, maxlen, "%s\n", name);                     \
1814 }                                                                       \
1815 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1816
1817 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1818         i->private_host_attrs[count] = device_attr_host_##field;        \
1819         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1820         i->private_host_attrs[count].store = NULL;                      \
1821         i->host_attrs[count] = &i->private_host_attrs[count];           \
1822         if (i->f->show_host_##field)                                    \
1823                 count++
1824
1825 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1826         i->private_host_attrs[count] = device_attr_host_##field;        \
1827         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1828         i->private_host_attrs[count].store = NULL;                      \
1829         i->host_attrs[count] = &i->private_host_attrs[count];           \
1830         count++
1831
1832 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1833         i->private_host_attrs[count] = device_attr_host_##field;        \
1834         if (!i->f->set_host_##field) {                                  \
1835                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1836                 i->private_host_attrs[count].store = NULL;              \
1837         }                                                               \
1838         i->host_attrs[count] = &i->private_host_attrs[count];           \
1839         if (i->f->show_host_##field)                                    \
1840                 count++
1841
1842
1843 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1844 static ssize_t                                                          \
1845 show_fc_host_##field (struct device *dev,                               \
1846                       struct device_attribute *attr, char *buf)         \
1847 {                                                                       \
1848         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1849         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1850 }
1851
1852 #define fc_private_host_rd_attr(field, format_string, sz)               \
1853         fc_private_host_show_function(field, format_string, sz, )       \
1854 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1855                          show_fc_host_##field, NULL)
1856
1857 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1858         fc_private_host_show_function(field, format_string, sz, (cast)) \
1859 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1860                           show_fc_host_##field, NULL)
1861
1862 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1863         i->private_host_attrs[count] = device_attr_host_##field;        \
1864         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1865         i->private_host_attrs[count].store = NULL;                      \
1866         i->host_attrs[count] = &i->private_host_attrs[count];           \
1867         count++
1868
1869 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1870 {                                                                       \
1871         i->private_host_attrs[count] = device_attr_host_##field;        \
1872         i->host_attrs[count] = &i->private_host_attrs[count];           \
1873         count++;                                                        \
1874 }
1875
1876
1877 /* Fixed Host Attributes */
1878
1879 static ssize_t
1880 show_fc_host_supported_classes (struct device *dev,
1881                                 struct device_attribute *attr, char *buf)
1882 {
1883         struct Scsi_Host *shost = transport_class_to_shost(dev);
1884
1885         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1886                 return snprintf(buf, 20, "unspecified\n");
1887
1888         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1889 }
1890 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1891                 show_fc_host_supported_classes, NULL);
1892
1893 static ssize_t
1894 show_fc_host_supported_fc4s (struct device *dev,
1895                              struct device_attribute *attr, char *buf)
1896 {
1897         struct Scsi_Host *shost = transport_class_to_shost(dev);
1898         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1899 }
1900 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1901                 show_fc_host_supported_fc4s, NULL);
1902
1903 static ssize_t
1904 show_fc_host_supported_speeds (struct device *dev,
1905                                struct device_attribute *attr, char *buf)
1906 {
1907         struct Scsi_Host *shost = transport_class_to_shost(dev);
1908
1909         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1910                 return snprintf(buf, 20, "unknown\n");
1911
1912         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1913 }
1914 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1915                 show_fc_host_supported_speeds, NULL);
1916
1917
1918 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1919 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1920 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1921                              unsigned long long);
1922 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1923 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1924 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1925 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1926 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1927 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1928 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1929 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1930 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1931 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1932
1933
1934 /* Dynamic Host Attributes */
1935
1936 static ssize_t
1937 show_fc_host_active_fc4s (struct device *dev,
1938                           struct device_attribute *attr, char *buf)
1939 {
1940         struct Scsi_Host *shost = transport_class_to_shost(dev);
1941         struct fc_internal *i = to_fc_internal(shost->transportt);
1942
1943         if (i->f->get_host_active_fc4s)
1944                 i->f->get_host_active_fc4s(shost);
1945
1946         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1947 }
1948 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1949                 show_fc_host_active_fc4s, NULL);
1950
1951 static ssize_t
1952 show_fc_host_speed (struct device *dev,
1953                     struct device_attribute *attr, char *buf)
1954 {
1955         struct Scsi_Host *shost = transport_class_to_shost(dev);
1956         struct fc_internal *i = to_fc_internal(shost->transportt);
1957
1958         if (i->f->get_host_speed)
1959                 i->f->get_host_speed(shost);
1960
1961         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1962                 return snprintf(buf, 20, "unknown\n");
1963
1964         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1965 }
1966 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1967                 show_fc_host_speed, NULL);
1968
1969
1970 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1971 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1972 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1973 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1974 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1975
1976 fc_private_host_show_function(system_hostname, "%s\n",
1977                 FC_SYMBOLIC_NAME_SIZE + 1, )
1978 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1979 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1980                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1981
1982
1983 /* Private Host Attributes */
1984
1985 static ssize_t
1986 show_fc_private_host_tgtid_bind_type(struct device *dev,
1987                                      struct device_attribute *attr, char *buf)
1988 {
1989         struct Scsi_Host *shost = transport_class_to_shost(dev);
1990         const char *name;
1991
1992         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1993         if (!name)
1994                 return -EINVAL;
1995         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1996 }
1997
1998 #define get_list_head_entry(pos, head, member)          \
1999         pos = list_entry((head)->next, typeof(*pos), member)
2000
2001 static ssize_t
2002 store_fc_private_host_tgtid_bind_type(struct device *dev,
2003         struct device_attribute *attr, const char *buf, size_t count)
2004 {
2005         struct Scsi_Host *shost = transport_class_to_shost(dev);
2006         struct fc_rport *rport;
2007         enum fc_tgtid_binding_type val;
2008         unsigned long flags;
2009
2010         if (get_fc_tgtid_bind_type_match(buf, &val))
2011                 return -EINVAL;
2012
2013         /* if changing bind type, purge all unused consistent bindings */
2014         if (val != fc_host_tgtid_bind_type(shost)) {
2015                 spin_lock_irqsave(shost->host_lock, flags);
2016                 while (!list_empty(&fc_host_rport_bindings(shost))) {
2017                         get_list_head_entry(rport,
2018                                 &fc_host_rport_bindings(shost), peers);
2019                         list_del(&rport->peers);
2020                         rport->port_state = FC_PORTSTATE_DELETED;
2021                         fc_queue_work(shost, &rport->rport_delete_work);
2022                 }
2023                 spin_unlock_irqrestore(shost->host_lock, flags);
2024         }
2025
2026         fc_host_tgtid_bind_type(shost) = val;
2027         return count;
2028 }
2029
2030 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2031                         show_fc_private_host_tgtid_bind_type,
2032                         store_fc_private_host_tgtid_bind_type);
2033
2034 static ssize_t
2035 store_fc_private_host_issue_lip(struct device *dev,
2036         struct device_attribute *attr, const char *buf, size_t count)
2037 {
2038         struct Scsi_Host *shost = transport_class_to_shost(dev);
2039         struct fc_internal *i = to_fc_internal(shost->transportt);
2040         int ret;
2041
2042         /* ignore any data value written to the attribute */
2043         if (i->f->issue_fc_host_lip) {
2044                 ret = i->f->issue_fc_host_lip(shost);
2045                 return ret ? ret: count;
2046         }
2047
2048         return -ENOENT;
2049 }
2050
2051 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2052                         store_fc_private_host_issue_lip);
2053
2054 static ssize_t
2055 store_fc_private_host_dev_loss_tmo(struct device *dev,
2056                                    struct device_attribute *attr,
2057                                    const char *buf, size_t count)
2058 {
2059         struct Scsi_Host *shost = transport_class_to_shost(dev);
2060         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2061         struct fc_rport *rport;
2062         unsigned long val, flags;
2063         int rc;
2064
2065         rc = fc_str_to_dev_loss(buf, &val);
2066         if (rc)
2067                 return rc;
2068
2069         fc_host_dev_loss_tmo(shost) = val;
2070         spin_lock_irqsave(shost->host_lock, flags);
2071         list_for_each_entry(rport, &fc_host->rports, peers)
2072                 fc_rport_set_dev_loss_tmo(rport, val);
2073         spin_unlock_irqrestore(shost->host_lock, flags);
2074         return count;
2075 }
2076
2077 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2078 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2079                       show_fc_host_dev_loss_tmo,
2080                       store_fc_private_host_dev_loss_tmo);
2081
2082 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2083
2084 /*
2085  * Host Statistics Management
2086  */
2087
2088 /* Show a given attribute in the statistics group */
2089 static ssize_t
2090 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2091 {
2092         struct Scsi_Host *shost = transport_class_to_shost(dev);
2093         struct fc_internal *i = to_fc_internal(shost->transportt);
2094         struct fc_host_statistics *stats;
2095         ssize_t ret = -ENOENT;
2096
2097         if (offset > sizeof(struct fc_host_statistics) ||
2098             offset % sizeof(u64) != 0)
2099                 WARN_ON(1);
2100
2101         if (i->f->get_fc_host_stats) {
2102                 stats = (i->f->get_fc_host_stats)(shost);
2103                 if (stats)
2104                         ret = snprintf(buf, 20, "0x%llx\n",
2105                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2106         }
2107         return ret;
2108 }
2109
2110
2111 /* generate a read-only statistics attribute */
2112 #define fc_host_statistic(name)                                         \
2113 static ssize_t show_fcstat_##name(struct device *cd,                    \
2114                                   struct device_attribute *attr,        \
2115                                   char *buf)                            \
2116 {                                                                       \
2117         return fc_stat_show(cd, buf,                                    \
2118                             offsetof(struct fc_host_statistics, name)); \
2119 }                                                                       \
2120 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2121
2122 fc_host_statistic(seconds_since_last_reset);
2123 fc_host_statistic(tx_frames);
2124 fc_host_statistic(tx_words);
2125 fc_host_statistic(rx_frames);
2126 fc_host_statistic(rx_words);
2127 fc_host_statistic(lip_count);
2128 fc_host_statistic(nos_count);
2129 fc_host_statistic(error_frames);
2130 fc_host_statistic(dumped_frames);
2131 fc_host_statistic(link_failure_count);
2132 fc_host_statistic(loss_of_sync_count);
2133 fc_host_statistic(loss_of_signal_count);
2134 fc_host_statistic(prim_seq_protocol_err_count);
2135 fc_host_statistic(invalid_tx_word_count);
2136 fc_host_statistic(invalid_crc_count);
2137 fc_host_statistic(fcp_input_requests);
2138 fc_host_statistic(fcp_output_requests);
2139 fc_host_statistic(fcp_control_requests);
2140 fc_host_statistic(fcp_input_megabytes);
2141 fc_host_statistic(fcp_output_megabytes);
2142 fc_host_statistic(fcp_packet_alloc_failures);
2143 fc_host_statistic(fcp_packet_aborts);
2144 fc_host_statistic(fcp_frame_alloc_failures);
2145 fc_host_statistic(fc_no_free_exch);
2146 fc_host_statistic(fc_no_free_exch_xid);
2147 fc_host_statistic(fc_xid_not_found);
2148 fc_host_statistic(fc_xid_busy);
2149 fc_host_statistic(fc_seq_not_found);
2150 fc_host_statistic(fc_non_bls_resp);
2151 fc_host_statistic(cn_sig_warn);
2152 fc_host_statistic(cn_sig_alarm);
2153
2154
2155 #define fc_host_fpin_statistic(name)                                    \
2156 static ssize_t fc_host_fpinstat_##name(struct device *cd,               \
2157                                   struct device_attribute *attr,        \
2158                                   char *buf)                            \
2159 {                                                                       \
2160         struct Scsi_Host *shost = transport_class_to_shost(cd);         \
2161         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);        \
2162                                                                         \
2163         return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2164 }                                                                       \
2165 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2166
2167 fc_host_fpin_statistic(dn);
2168 fc_host_fpin_statistic(dn_unknown);
2169 fc_host_fpin_statistic(dn_timeout);
2170 fc_host_fpin_statistic(dn_unable_to_route);
2171 fc_host_fpin_statistic(dn_device_specific);
2172 fc_host_fpin_statistic(cn);
2173 fc_host_fpin_statistic(cn_clear);
2174 fc_host_fpin_statistic(cn_lost_credit);
2175 fc_host_fpin_statistic(cn_credit_stall);
2176 fc_host_fpin_statistic(cn_oversubscription);
2177 fc_host_fpin_statistic(cn_device_specific);
2178 fc_host_fpin_statistic(li);
2179 fc_host_fpin_statistic(li_failure_unknown);
2180 fc_host_fpin_statistic(li_link_failure_count);
2181 fc_host_fpin_statistic(li_loss_of_sync_count);
2182 fc_host_fpin_statistic(li_loss_of_signals_count);
2183 fc_host_fpin_statistic(li_prim_seq_err_count);
2184 fc_host_fpin_statistic(li_invalid_tx_word_count);
2185 fc_host_fpin_statistic(li_invalid_crc_count);
2186 fc_host_fpin_statistic(li_device_specific);
2187
2188 static ssize_t
2189 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2190                     const char *buf, size_t count)
2191 {
2192         struct Scsi_Host *shost = transport_class_to_shost(dev);
2193         struct fc_internal *i = to_fc_internal(shost->transportt);
2194
2195         /* ignore any data value written to the attribute */
2196         if (i->f->reset_fc_host_stats) {
2197                 i->f->reset_fc_host_stats(shost);
2198                 return count;
2199         }
2200
2201         return -ENOENT;
2202 }
2203 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2204                                 fc_reset_statistics);
2205
2206 static struct attribute *fc_statistics_attrs[] = {
2207         &device_attr_host_seconds_since_last_reset.attr,
2208         &device_attr_host_tx_frames.attr,
2209         &device_attr_host_tx_words.attr,
2210         &device_attr_host_rx_frames.attr,
2211         &device_attr_host_rx_words.attr,
2212         &device_attr_host_lip_count.attr,
2213         &device_attr_host_nos_count.attr,
2214         &device_attr_host_error_frames.attr,
2215         &device_attr_host_dumped_frames.attr,
2216         &device_attr_host_link_failure_count.attr,
2217         &device_attr_host_loss_of_sync_count.attr,
2218         &device_attr_host_loss_of_signal_count.attr,
2219         &device_attr_host_prim_seq_protocol_err_count.attr,
2220         &device_attr_host_invalid_tx_word_count.attr,
2221         &device_attr_host_invalid_crc_count.attr,
2222         &device_attr_host_fcp_input_requests.attr,
2223         &device_attr_host_fcp_output_requests.attr,
2224         &device_attr_host_fcp_control_requests.attr,
2225         &device_attr_host_fcp_input_megabytes.attr,
2226         &device_attr_host_fcp_output_megabytes.attr,
2227         &device_attr_host_fcp_packet_alloc_failures.attr,
2228         &device_attr_host_fcp_packet_aborts.attr,
2229         &device_attr_host_fcp_frame_alloc_failures.attr,
2230         &device_attr_host_fc_no_free_exch.attr,
2231         &device_attr_host_fc_no_free_exch_xid.attr,
2232         &device_attr_host_fc_xid_not_found.attr,
2233         &device_attr_host_fc_xid_busy.attr,
2234         &device_attr_host_fc_seq_not_found.attr,
2235         &device_attr_host_fc_non_bls_resp.attr,
2236         &device_attr_host_cn_sig_warn.attr,
2237         &device_attr_host_cn_sig_alarm.attr,
2238         &device_attr_host_reset_statistics.attr,
2239         &device_attr_host_fpin_dn.attr,
2240         &device_attr_host_fpin_dn_unknown.attr,
2241         &device_attr_host_fpin_dn_timeout.attr,
2242         &device_attr_host_fpin_dn_unable_to_route.attr,
2243         &device_attr_host_fpin_dn_device_specific.attr,
2244         &device_attr_host_fpin_li.attr,
2245         &device_attr_host_fpin_li_failure_unknown.attr,
2246         &device_attr_host_fpin_li_link_failure_count.attr,
2247         &device_attr_host_fpin_li_loss_of_sync_count.attr,
2248         &device_attr_host_fpin_li_loss_of_signals_count.attr,
2249         &device_attr_host_fpin_li_prim_seq_err_count.attr,
2250         &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2251         &device_attr_host_fpin_li_invalid_crc_count.attr,
2252         &device_attr_host_fpin_li_device_specific.attr,
2253         &device_attr_host_fpin_cn.attr,
2254         &device_attr_host_fpin_cn_clear.attr,
2255         &device_attr_host_fpin_cn_lost_credit.attr,
2256         &device_attr_host_fpin_cn_credit_stall.attr,
2257         &device_attr_host_fpin_cn_oversubscription.attr,
2258         &device_attr_host_fpin_cn_device_specific.attr,
2259         NULL
2260 };
2261
2262 static struct attribute_group fc_statistics_group = {
2263         .name = "statistics",
2264         .attrs = fc_statistics_attrs,
2265 };
2266
2267
2268 /* Host Vport Attributes */
2269
2270 static int
2271 fc_parse_wwn(const char *ns, u64 *nm)
2272 {
2273         unsigned int i, j;
2274         u8 wwn[8];
2275
2276         memset(wwn, 0, sizeof(wwn));
2277
2278         /* Validate and store the new name */
2279         for (i=0, j=0; i < 16; i++) {
2280                 int value;
2281
2282                 value = hex_to_bin(*ns++);
2283                 if (value >= 0)
2284                         j = (j << 4) | value;
2285                 else
2286                         return -EINVAL;
2287                 if (i % 2) {
2288                         wwn[i/2] = j & 0xff;
2289                         j = 0;
2290                 }
2291         }
2292
2293         *nm = wwn_to_u64(wwn);
2294
2295         return 0;
2296 }
2297
2298
2299 /*
2300  * "Short-cut" sysfs variable to create a new vport on a FC Host.
2301  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2302  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2303  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2304  */
2305 static ssize_t
2306 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2307                            const char *buf, size_t count)
2308 {
2309         struct Scsi_Host *shost = transport_class_to_shost(dev);
2310         struct fc_vport_identifiers vid;
2311         struct fc_vport *vport;
2312         unsigned int cnt=count;
2313         int stat;
2314
2315         memset(&vid, 0, sizeof(vid));
2316
2317         /* count may include a LF at end of string */
2318         if (buf[cnt-1] == '\n')
2319                 cnt--;
2320
2321         /* validate we have enough characters for WWPN */
2322         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2323                 return -EINVAL;
2324
2325         stat = fc_parse_wwn(&buf[0], &vid.port_name);
2326         if (stat)
2327                 return stat;
2328
2329         stat = fc_parse_wwn(&buf[17], &vid.node_name);
2330         if (stat)
2331                 return stat;
2332
2333         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2334         vid.vport_type = FC_PORTTYPE_NPIV;
2335         /* vid.symbolic_name is already zero/NULL's */
2336         vid.disable = false;            /* always enabled */
2337
2338         /* we only allow support on Channel 0 !!! */
2339         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2340         return stat ? stat : count;
2341 }
2342 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2343                         store_fc_host_vport_create);
2344
2345
2346 /*
2347  * "Short-cut" sysfs variable to delete a vport on a FC Host.
2348  * Vport is identified by a string containing "<WWPN>:<WWNN>".
2349  * The WWNs are specified as hex characters, and may *not* contain
2350  * any prefixes (e.g. 0x, x, etc)
2351  */
2352 static ssize_t
2353 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2354                            const char *buf, size_t count)
2355 {
2356         struct Scsi_Host *shost = transport_class_to_shost(dev);
2357         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2358         struct fc_vport *vport;
2359         u64 wwpn, wwnn;
2360         unsigned long flags;
2361         unsigned int cnt=count;
2362         int stat, match;
2363
2364         /* count may include a LF at end of string */
2365         if (buf[cnt-1] == '\n')
2366                 cnt--;
2367
2368         /* validate we have enough characters for WWPN */
2369         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2370                 return -EINVAL;
2371
2372         stat = fc_parse_wwn(&buf[0], &wwpn);
2373         if (stat)
2374                 return stat;
2375
2376         stat = fc_parse_wwn(&buf[17], &wwnn);
2377         if (stat)
2378                 return stat;
2379
2380         spin_lock_irqsave(shost->host_lock, flags);
2381         match = 0;
2382         /* we only allow support on Channel 0 !!! */
2383         list_for_each_entry(vport, &fc_host->vports, peers) {
2384                 if ((vport->channel == 0) &&
2385                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2386                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2387                                 break;
2388                         vport->flags |= FC_VPORT_DELETING;
2389                         match = 1;
2390                         break;
2391                 }
2392         }
2393         spin_unlock_irqrestore(shost->host_lock, flags);
2394
2395         if (!match)
2396                 return -ENODEV;
2397
2398         stat = fc_vport_terminate(vport);
2399         return stat ? stat : count;
2400 }
2401 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2402                         store_fc_host_vport_delete);
2403
2404
2405 static int fc_host_match(struct attribute_container *cont,
2406                           struct device *dev)
2407 {
2408         struct Scsi_Host *shost;
2409         struct fc_internal *i;
2410
2411         if (!scsi_is_host_device(dev))
2412                 return 0;
2413
2414         shost = dev_to_shost(dev);
2415         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2416             != &fc_host_class.class)
2417                 return 0;
2418
2419         i = to_fc_internal(shost->transportt);
2420
2421         return &i->t.host_attrs.ac == cont;
2422 }
2423
2424 static int fc_target_match(struct attribute_container *cont,
2425                             struct device *dev)
2426 {
2427         struct Scsi_Host *shost;
2428         struct fc_internal *i;
2429
2430         if (!scsi_is_target_device(dev))
2431                 return 0;
2432
2433         shost = dev_to_shost(dev->parent);
2434         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2435             != &fc_host_class.class)
2436                 return 0;
2437
2438         i = to_fc_internal(shost->transportt);
2439
2440         return &i->t.target_attrs.ac == cont;
2441 }
2442
2443 static void fc_rport_dev_release(struct device *dev)
2444 {
2445         struct fc_rport *rport = dev_to_rport(dev);
2446         put_device(dev->parent);
2447         kfree(rport);
2448 }
2449
2450 int scsi_is_fc_rport(const struct device *dev)
2451 {
2452         return dev->release == fc_rport_dev_release;
2453 }
2454 EXPORT_SYMBOL(scsi_is_fc_rport);
2455
2456 static int fc_rport_match(struct attribute_container *cont,
2457                             struct device *dev)
2458 {
2459         struct Scsi_Host *shost;
2460         struct fc_internal *i;
2461
2462         if (!scsi_is_fc_rport(dev))
2463                 return 0;
2464
2465         shost = dev_to_shost(dev->parent);
2466         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2467             != &fc_host_class.class)
2468                 return 0;
2469
2470         i = to_fc_internal(shost->transportt);
2471
2472         return &i->rport_attr_cont.ac == cont;
2473 }
2474
2475
2476 static void fc_vport_dev_release(struct device *dev)
2477 {
2478         struct fc_vport *vport = dev_to_vport(dev);
2479         put_device(dev->parent);                /* release kobj parent */
2480         kfree(vport);
2481 }
2482
2483 static int scsi_is_fc_vport(const struct device *dev)
2484 {
2485         return dev->release == fc_vport_dev_release;
2486 }
2487
2488 static int fc_vport_match(struct attribute_container *cont,
2489                             struct device *dev)
2490 {
2491         struct fc_vport *vport;
2492         struct Scsi_Host *shost;
2493         struct fc_internal *i;
2494
2495         if (!scsi_is_fc_vport(dev))
2496                 return 0;
2497         vport = dev_to_vport(dev);
2498
2499         shost = vport_to_shost(vport);
2500         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2501             != &fc_host_class.class)
2502                 return 0;
2503
2504         i = to_fc_internal(shost->transportt);
2505         return &i->vport_attr_cont.ac == cont;
2506 }
2507
2508
2509 /**
2510  * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2511  * @scmd:       The SCSI command which timed out
2512  *
2513  * This routine protects against error handlers getting invoked while a
2514  * rport is in a blocked state, typically due to a temporarily loss of
2515  * connectivity. If the error handlers are allowed to proceed, requests
2516  * to abort i/o, reset the target, etc will likely fail as there is no way
2517  * to communicate with the device to perform the requested function. These
2518  * failures may result in the midlayer taking the device offline, requiring
2519  * manual intervention to restore operation.
2520  *
2521  * This routine, called whenever an i/o times out, validates the state of
2522  * the underlying rport. If the rport is blocked, it returns
2523  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2524  * Eventually, either the device will return, or devloss_tmo will fire,
2525  * and when the timeout then fires, it will be handled normally.
2526  * If the rport is not blocked, normal error handling continues.
2527  *
2528  * Notes:
2529  *      This routine assumes no locks are held on entry.
2530  */
2531 enum blk_eh_timer_return
2532 fc_eh_timed_out(struct scsi_cmnd *scmd)
2533 {
2534         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2535
2536         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2537                 return BLK_EH_RESET_TIMER;
2538
2539         return BLK_EH_DONE;
2540 }
2541 EXPORT_SYMBOL(fc_eh_timed_out);
2542
2543 /*
2544  * Called by fc_user_scan to locate an rport on the shost that
2545  * matches the channel and target id, and invoke scsi_scan_target()
2546  * on the rport.
2547  */
2548 static void
2549 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2550 {
2551         struct fc_rport *rport;
2552         unsigned long flags;
2553
2554         spin_lock_irqsave(shost->host_lock, flags);
2555
2556         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2557                 if (rport->scsi_target_id == -1)
2558                         continue;
2559
2560                 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2561                         (rport->port_state != FC_PORTSTATE_MARGINAL))
2562                         continue;
2563
2564                 if ((channel == rport->channel) &&
2565                     (id == rport->scsi_target_id)) {
2566                         spin_unlock_irqrestore(shost->host_lock, flags);
2567                         scsi_scan_target(&rport->dev, channel, id, lun,
2568                                          SCSI_SCAN_MANUAL);
2569                         return;
2570                 }
2571         }
2572
2573         spin_unlock_irqrestore(shost->host_lock, flags);
2574 }
2575
2576 /*
2577  * Called via sysfs scan routines. Necessary, as the FC transport
2578  * wants to place all target objects below the rport object. So this
2579  * routine must invoke the scsi_scan_target() routine with the rport
2580  * object as the parent.
2581  */
2582 static int
2583 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2584 {
2585         uint chlo, chhi;
2586         uint tgtlo, tgthi;
2587
2588         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2589             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2590             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2591                 return -EINVAL;
2592
2593         if (channel == SCAN_WILD_CARD) {
2594                 chlo = 0;
2595                 chhi = shost->max_channel + 1;
2596         } else {
2597                 chlo = channel;
2598                 chhi = channel + 1;
2599         }
2600
2601         if (id == SCAN_WILD_CARD) {
2602                 tgtlo = 0;
2603                 tgthi = shost->max_id;
2604         } else {
2605                 tgtlo = id;
2606                 tgthi = id + 1;
2607         }
2608
2609         for ( ; chlo < chhi; chlo++)
2610                 for ( ; tgtlo < tgthi; tgtlo++)
2611                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2612
2613         return 0;
2614 }
2615
2616 struct scsi_transport_template *
2617 fc_attach_transport(struct fc_function_template *ft)
2618 {
2619         int count;
2620         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2621                                         GFP_KERNEL);
2622
2623         if (unlikely(!i))
2624                 return NULL;
2625
2626         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2627         i->t.target_attrs.ac.class = &fc_transport_class.class;
2628         i->t.target_attrs.ac.match = fc_target_match;
2629         i->t.target_size = sizeof(struct fc_starget_attrs);
2630         transport_container_register(&i->t.target_attrs);
2631
2632         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2633         i->t.host_attrs.ac.class = &fc_host_class.class;
2634         i->t.host_attrs.ac.match = fc_host_match;
2635         i->t.host_size = sizeof(struct fc_host_attrs);
2636         if (ft->get_fc_host_stats)
2637                 i->t.host_attrs.statistics = &fc_statistics_group;
2638         transport_container_register(&i->t.host_attrs);
2639
2640         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2641         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2642         i->rport_attr_cont.ac.match = fc_rport_match;
2643         i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2644         transport_container_register(&i->rport_attr_cont);
2645
2646         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2647         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2648         i->vport_attr_cont.ac.match = fc_vport_match;
2649         transport_container_register(&i->vport_attr_cont);
2650
2651         i->f = ft;
2652
2653         /* Transport uses the shost workq for scsi scanning */
2654         i->t.create_work_queue = 1;
2655
2656         i->t.user_scan = fc_user_scan;
2657
2658         /*
2659          * Setup SCSI Target Attributes.
2660          */
2661         count = 0;
2662         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2663         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2664         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2665
2666         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2667
2668         i->starget_attrs[count] = NULL;
2669
2670
2671         /*
2672          * Setup SCSI Host Attributes.
2673          */
2674         count=0;
2675         SETUP_HOST_ATTRIBUTE_RD(node_name);
2676         SETUP_HOST_ATTRIBUTE_RD(port_name);
2677         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2678         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2679         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2680         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2681         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2682         if (ft->vport_create) {
2683                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2684                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2685         }
2686         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2687         SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2688         SETUP_HOST_ATTRIBUTE_RD(model);
2689         SETUP_HOST_ATTRIBUTE_RD(model_description);
2690         SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2691         SETUP_HOST_ATTRIBUTE_RD(driver_version);
2692         SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2693         SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2694
2695         SETUP_HOST_ATTRIBUTE_RD(port_id);
2696         SETUP_HOST_ATTRIBUTE_RD(port_type);
2697         SETUP_HOST_ATTRIBUTE_RD(port_state);
2698         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2699         SETUP_HOST_ATTRIBUTE_RD(speed);
2700         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2701         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2702         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2703
2704         /* Transport-managed attributes */
2705         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2706         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2707         if (ft->issue_fc_host_lip)
2708                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2709         if (ft->vport_create)
2710                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2711         if (ft->vport_delete)
2712                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2713
2714         BUG_ON(count > FC_HOST_NUM_ATTRS);
2715
2716         i->host_attrs[count] = NULL;
2717
2718         /*
2719          * Setup Remote Port Attributes.
2720          */
2721         count=0;
2722         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2723         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2724         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2725         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2726         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2727         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2728         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2729         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2730         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2731         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2732
2733         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2734
2735         i->rport_attrs[count] = NULL;
2736
2737         /*
2738          * Setup Virtual Port Attributes.
2739          */
2740         count=0;
2741         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2742         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2743         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2744         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2745         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2746         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2747         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2748         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2749         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2750
2751         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2752
2753         i->vport_attrs[count] = NULL;
2754
2755         return &i->t;
2756 }
2757 EXPORT_SYMBOL(fc_attach_transport);
2758
2759 void fc_release_transport(struct scsi_transport_template *t)
2760 {
2761         struct fc_internal *i = to_fc_internal(t);
2762
2763         transport_container_unregister(&i->t.target_attrs);
2764         transport_container_unregister(&i->t.host_attrs);
2765         transport_container_unregister(&i->rport_attr_cont);
2766         transport_container_unregister(&i->vport_attr_cont);
2767
2768         kfree(i);
2769 }
2770 EXPORT_SYMBOL(fc_release_transport);
2771
2772 /**
2773  * fc_queue_work - Queue work to the fc_host workqueue.
2774  * @shost:      Pointer to Scsi_Host bound to fc_host.
2775  * @work:       Work to queue for execution.
2776  *
2777  * Return value:
2778  *      1 - work queued for execution
2779  *      0 - work is already queued
2780  *      -EINVAL - work queue doesn't exist
2781  */
2782 static int
2783 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2784 {
2785         if (unlikely(!fc_host_work_q(shost))) {
2786                 printk(KERN_ERR
2787                         "ERROR: FC host '%s' attempted to queue work, "
2788                         "when no workqueue created.\n", shost->hostt->name);
2789                 dump_stack();
2790
2791                 return -EINVAL;
2792         }
2793
2794         return queue_work(fc_host_work_q(shost), work);
2795 }
2796
2797 /**
2798  * fc_flush_work - Flush a fc_host's workqueue.
2799  * @shost:      Pointer to Scsi_Host bound to fc_host.
2800  */
2801 static void
2802 fc_flush_work(struct Scsi_Host *shost)
2803 {
2804         if (!fc_host_work_q(shost)) {
2805                 printk(KERN_ERR
2806                         "ERROR: FC host '%s' attempted to flush work, "
2807                         "when no workqueue created.\n", shost->hostt->name);
2808                 dump_stack();
2809                 return;
2810         }
2811
2812         flush_workqueue(fc_host_work_q(shost));
2813 }
2814
2815 /**
2816  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2817  * @shost:      Pointer to Scsi_Host bound to fc_host.
2818  * @work:       Work to queue for execution.
2819  * @delay:      jiffies to delay the work queuing
2820  *
2821  * Return value:
2822  *      1 on success / 0 already queued / < 0 for error
2823  */
2824 static int
2825 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2826                                 unsigned long delay)
2827 {
2828         if (unlikely(!fc_host_devloss_work_q(shost))) {
2829                 printk(KERN_ERR
2830                         "ERROR: FC host '%s' attempted to queue work, "
2831                         "when no workqueue created.\n", shost->hostt->name);
2832                 dump_stack();
2833
2834                 return -EINVAL;
2835         }
2836
2837         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2838 }
2839
2840 /**
2841  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2842  * @shost:      Pointer to Scsi_Host bound to fc_host.
2843  */
2844 static void
2845 fc_flush_devloss(struct Scsi_Host *shost)
2846 {
2847         if (!fc_host_devloss_work_q(shost)) {
2848                 printk(KERN_ERR
2849                         "ERROR: FC host '%s' attempted to flush work, "
2850                         "when no workqueue created.\n", shost->hostt->name);
2851                 dump_stack();
2852                 return;
2853         }
2854
2855         flush_workqueue(fc_host_devloss_work_q(shost));
2856 }
2857
2858
2859 /**
2860  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2861  * @shost:      Which &Scsi_Host
2862  *
2863  * This routine is expected to be called immediately preceding the
2864  * a driver's call to scsi_remove_host().
2865  *
2866  * WARNING: A driver utilizing the fc_transport, which fails to call
2867  *   this routine prior to scsi_remove_host(), will leave dangling
2868  *   objects in /sys/class/fc_remote_ports. Access to any of these
2869  *   objects can result in a system crash !!!
2870  *
2871  * Notes:
2872  *      This routine assumes no locks are held on entry.
2873  */
2874 void
2875 fc_remove_host(struct Scsi_Host *shost)
2876 {
2877         struct fc_vport *vport = NULL, *next_vport = NULL;
2878         struct fc_rport *rport = NULL, *next_rport = NULL;
2879         struct workqueue_struct *work_q;
2880         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2881         unsigned long flags;
2882
2883         spin_lock_irqsave(shost->host_lock, flags);
2884
2885         /* Remove any vports */
2886         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2887                 vport->flags |= FC_VPORT_DELETING;
2888                 fc_queue_work(shost, &vport->vport_delete_work);
2889         }
2890
2891         /* Remove any remote ports */
2892         list_for_each_entry_safe(rport, next_rport,
2893                         &fc_host->rports, peers) {
2894                 list_del(&rport->peers);
2895                 rport->port_state = FC_PORTSTATE_DELETED;
2896                 fc_queue_work(shost, &rport->rport_delete_work);
2897         }
2898
2899         list_for_each_entry_safe(rport, next_rport,
2900                         &fc_host->rport_bindings, peers) {
2901                 list_del(&rport->peers);
2902                 rport->port_state = FC_PORTSTATE_DELETED;
2903                 fc_queue_work(shost, &rport->rport_delete_work);
2904         }
2905
2906         spin_unlock_irqrestore(shost->host_lock, flags);
2907
2908         /* flush all scan work items */
2909         scsi_flush_work(shost);
2910
2911         /* flush all stgt delete, and rport delete work items, then kill it  */
2912         if (fc_host->work_q) {
2913                 work_q = fc_host->work_q;
2914                 fc_host->work_q = NULL;
2915                 destroy_workqueue(work_q);
2916         }
2917
2918         /* flush all devloss work items, then kill it  */
2919         if (fc_host->devloss_work_q) {
2920                 work_q = fc_host->devloss_work_q;
2921                 fc_host->devloss_work_q = NULL;
2922                 destroy_workqueue(work_q);
2923         }
2924 }
2925 EXPORT_SYMBOL(fc_remove_host);
2926
2927 static void fc_terminate_rport_io(struct fc_rport *rport)
2928 {
2929         struct Scsi_Host *shost = rport_to_shost(rport);
2930         struct fc_internal *i = to_fc_internal(shost->transportt);
2931
2932         /* Involve the LLDD if possible to terminate all io on the rport. */
2933         if (i->f->terminate_rport_io)
2934                 i->f->terminate_rport_io(rport);
2935
2936         /*
2937          * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2938          */
2939         scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2940 }
2941
2942 /**
2943  * fc_starget_delete - called to delete the scsi descendants of an rport
2944  * @work:       remote port to be operated on.
2945  *
2946  * Deletes target and all sdevs.
2947  */
2948 static void
2949 fc_starget_delete(struct work_struct *work)
2950 {
2951         struct fc_rport *rport =
2952                 container_of(work, struct fc_rport, stgt_delete_work);
2953
2954         fc_terminate_rport_io(rport);
2955         scsi_remove_target(&rport->dev);
2956 }
2957
2958
2959 /**
2960  * fc_rport_final_delete - finish rport termination and delete it.
2961  * @work:       remote port to be deleted.
2962  */
2963 static void
2964 fc_rport_final_delete(struct work_struct *work)
2965 {
2966         struct fc_rport *rport =
2967                 container_of(work, struct fc_rport, rport_delete_work);
2968         struct device *dev = &rport->dev;
2969         struct Scsi_Host *shost = rport_to_shost(rport);
2970         struct fc_internal *i = to_fc_internal(shost->transportt);
2971         unsigned long flags;
2972         int do_callback = 0;
2973
2974         fc_terminate_rport_io(rport);
2975
2976         /*
2977          * if a scan is pending, flush the SCSI Host work_q so that
2978          * that we can reclaim the rport scan work element.
2979          */
2980         if (rport->flags & FC_RPORT_SCAN_PENDING)
2981                 scsi_flush_work(shost);
2982
2983         /*
2984          * Cancel any outstanding timers. These should really exist
2985          * only when rmmod'ing the LLDD and we're asking for
2986          * immediate termination of the rports
2987          */
2988         spin_lock_irqsave(shost->host_lock, flags);
2989         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2990                 spin_unlock_irqrestore(shost->host_lock, flags);
2991                 if (!cancel_delayed_work(&rport->fail_io_work))
2992                         fc_flush_devloss(shost);
2993                 if (!cancel_delayed_work(&rport->dev_loss_work))
2994                         fc_flush_devloss(shost);
2995                 cancel_work_sync(&rport->scan_work);
2996                 spin_lock_irqsave(shost->host_lock, flags);
2997                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2998         }
2999         spin_unlock_irqrestore(shost->host_lock, flags);
3000
3001         /* Delete SCSI target and sdevs */
3002         if (rport->scsi_target_id != -1)
3003                 fc_starget_delete(&rport->stgt_delete_work);
3004
3005         /*
3006          * Notify the driver that the rport is now dead. The LLDD will
3007          * also guarantee that any communication to the rport is terminated
3008          *
3009          * Avoid this call if we already called it when we preserved the
3010          * rport for the binding.
3011          */
3012         spin_lock_irqsave(shost->host_lock, flags);
3013         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3014             (i->f->dev_loss_tmo_callbk)) {
3015                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3016                 do_callback = 1;
3017         }
3018         spin_unlock_irqrestore(shost->host_lock, flags);
3019
3020         if (do_callback)
3021                 i->f->dev_loss_tmo_callbk(rport);
3022
3023         fc_bsg_remove(rport->rqst_q);
3024
3025         transport_remove_device(dev);
3026         device_del(dev);
3027         transport_destroy_device(dev);
3028         scsi_host_put(shost);                   /* for fc_host->rport list */
3029         put_device(dev);                        /* for self-reference */
3030 }
3031
3032
3033 /**
3034  * fc_remote_port_create - allocates and creates a remote FC port.
3035  * @shost:      scsi host the remote port is connected to.
3036  * @channel:    Channel on shost port connected to.
3037  * @ids:        The world wide names, fc address, and FC4 port
3038  *              roles for the remote port.
3039  *
3040  * Allocates and creates the remoter port structure, including the
3041  * class and sysfs creation.
3042  *
3043  * Notes:
3044  *      This routine assumes no locks are held on entry.
3045  */
3046 static struct fc_rport *
3047 fc_remote_port_create(struct Scsi_Host *shost, int channel,
3048                       struct fc_rport_identifiers  *ids)
3049 {
3050         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3051         struct fc_internal *fci = to_fc_internal(shost->transportt);
3052         struct fc_rport *rport;
3053         struct device *dev;
3054         unsigned long flags;
3055         int error;
3056         size_t size;
3057
3058         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3059         rport = kzalloc(size, GFP_KERNEL);
3060         if (unlikely(!rport)) {
3061                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3062                 return NULL;
3063         }
3064
3065         rport->maxframe_size = -1;
3066         rport->supported_classes = FC_COS_UNSPECIFIED;
3067         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3068         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3069         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3070         rport->port_id = ids->port_id;
3071         rport->roles = ids->roles;
3072         rport->port_state = FC_PORTSTATE_ONLINE;
3073         if (fci->f->dd_fcrport_size)
3074                 rport->dd_data = &rport[1];
3075         rport->channel = channel;
3076         rport->fast_io_fail_tmo = -1;
3077
3078         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3079         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3080         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3081         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3082         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3083
3084         spin_lock_irqsave(shost->host_lock, flags);
3085
3086         rport->number = fc_host->next_rport_number++;
3087         if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3088             (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3089                 rport->scsi_target_id = fc_host->next_target_id++;
3090         else
3091                 rport->scsi_target_id = -1;
3092         list_add_tail(&rport->peers, &fc_host->rports);
3093         scsi_host_get(shost);                   /* for fc_host->rport list */
3094
3095         spin_unlock_irqrestore(shost->host_lock, flags);
3096
3097         dev = &rport->dev;
3098         device_initialize(dev);                 /* takes self reference */
3099         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3100         dev->release = fc_rport_dev_release;
3101         dev_set_name(dev, "rport-%d:%d-%d",
3102                      shost->host_no, channel, rport->number);
3103         transport_setup_device(dev);
3104
3105         error = device_add(dev);
3106         if (error) {
3107                 printk(KERN_ERR "FC Remote Port device_add failed\n");
3108                 goto delete_rport;
3109         }
3110         transport_add_device(dev);
3111         transport_configure_device(dev);
3112
3113         fc_bsg_rportadd(shost, rport);
3114         /* ignore any bsg add error - we just can't do sgio */
3115
3116         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3117                 /* initiate a scan of the target */
3118                 rport->flags |= FC_RPORT_SCAN_PENDING;
3119                 scsi_queue_work(shost, &rport->scan_work);
3120         }
3121
3122         return rport;
3123
3124 delete_rport:
3125         transport_destroy_device(dev);
3126         spin_lock_irqsave(shost->host_lock, flags);
3127         list_del(&rport->peers);
3128         scsi_host_put(shost);                   /* for fc_host->rport list */
3129         spin_unlock_irqrestore(shost->host_lock, flags);
3130         put_device(dev->parent);
3131         kfree(rport);
3132         return NULL;
3133 }
3134
3135 /**
3136  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3137  * @shost:      scsi host the remote port is connected to.
3138  * @channel:    Channel on shost port connected to.
3139  * @ids:        The world wide names, fc address, and FC4 port
3140  *              roles for the remote port.
3141  *
3142  * The LLDD calls this routine to notify the transport of the existence
3143  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3144  * of the port, it's FC address (port_id), and the FC4 roles that are
3145  * active for the port.
3146  *
3147  * For ports that are FCP targets (aka scsi targets), the FC transport
3148  * maintains consistent target id bindings on behalf of the LLDD.
3149  * A consistent target id binding is an assignment of a target id to
3150  * a remote port identifier, which persists while the scsi host is
3151  * attached. The remote port can disappear, then later reappear, and
3152  * it's target id assignment remains the same. This allows for shifts
3153  * in FC addressing (if binding by wwpn or wwnn) with no apparent
3154  * changes to the scsi subsystem which is based on scsi host number and
3155  * target id values.  Bindings are only valid during the attachment of
3156  * the scsi host. If the host detaches, then later re-attaches, target
3157  * id bindings may change.
3158  *
3159  * This routine is responsible for returning a remote port structure.
3160  * The routine will search the list of remote ports it maintains
3161  * internally on behalf of consistent target id mappings. If found, the
3162  * remote port structure will be reused. Otherwise, a new remote port
3163  * structure will be allocated.
3164  *
3165  * Whenever a remote port is allocated, a new fc_remote_port class
3166  * device is created.
3167  *
3168  * Should not be called from interrupt context.
3169  *
3170  * Notes:
3171  *      This routine assumes no locks are held on entry.
3172  */
3173 struct fc_rport *
3174 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3175         struct fc_rport_identifiers  *ids)
3176 {
3177         struct fc_internal *fci = to_fc_internal(shost->transportt);
3178         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3179         struct fc_rport *rport;
3180         unsigned long flags;
3181         int match = 0;
3182
3183         /* ensure any stgt delete functions are done */
3184         fc_flush_work(shost);
3185
3186         /*
3187          * Search the list of "active" rports, for an rport that has been
3188          * deleted, but we've held off the real delete while the target
3189          * is in a "blocked" state.
3190          */
3191         spin_lock_irqsave(shost->host_lock, flags);
3192
3193         list_for_each_entry(rport, &fc_host->rports, peers) {
3194
3195                 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3196                      rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3197                         (rport->channel == channel)) {
3198
3199                         switch (fc_host->tgtid_bind_type) {
3200                         case FC_TGTID_BIND_BY_WWPN:
3201                         case FC_TGTID_BIND_NONE:
3202                                 if (rport->port_name == ids->port_name)
3203                                         match = 1;
3204                                 break;
3205                         case FC_TGTID_BIND_BY_WWNN:
3206                                 if (rport->node_name == ids->node_name)
3207                                         match = 1;
3208                                 break;
3209                         case FC_TGTID_BIND_BY_ID:
3210                                 if (rport->port_id == ids->port_id)
3211                                         match = 1;
3212                                 break;
3213                         }
3214
3215                         if (match) {
3216
3217                                 memcpy(&rport->node_name, &ids->node_name,
3218                                         sizeof(rport->node_name));
3219                                 memcpy(&rport->port_name, &ids->port_name,
3220                                         sizeof(rport->port_name));
3221                                 rport->port_id = ids->port_id;
3222
3223                                 rport->port_state = FC_PORTSTATE_ONLINE;
3224                                 rport->roles = ids->roles;
3225
3226                                 spin_unlock_irqrestore(shost->host_lock, flags);
3227
3228                                 if (fci->f->dd_fcrport_size)
3229                                         memset(rport->dd_data, 0,
3230                                                 fci->f->dd_fcrport_size);
3231
3232                                 /*
3233                                  * If we were not a target, cancel the
3234                                  * io terminate and rport timers, and
3235                                  * we're done.
3236                                  *
3237                                  * If we were a target, but our new role
3238                                  * doesn't indicate a target, leave the
3239                                  * timers running expecting the role to
3240                                  * change as the target fully logs in. If
3241                                  * it doesn't, the target will be torn down.
3242                                  *
3243                                  * If we were a target, and our role shows
3244                                  * we're still a target, cancel the timers
3245                                  * and kick off a scan.
3246                                  */
3247
3248                                 /* was a target, not in roles */
3249                                 if ((rport->scsi_target_id != -1) &&
3250                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3251                                         return rport;
3252
3253                                 /*
3254                                  * Stop the fail io and dev_loss timers.
3255                                  * If they flush, the port_state will
3256                                  * be checked and will NOOP the function.
3257                                  */
3258                                 if (!cancel_delayed_work(&rport->fail_io_work))
3259                                         fc_flush_devloss(shost);
3260                                 if (!cancel_delayed_work(&rport->dev_loss_work))
3261                                         fc_flush_devloss(shost);
3262
3263                                 spin_lock_irqsave(shost->host_lock, flags);
3264
3265                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3266                                                   FC_RPORT_DEVLOSS_PENDING |
3267                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3268
3269                                 spin_unlock_irqrestore(shost->host_lock, flags);
3270
3271                                 /* if target, initiate a scan */
3272                                 if (rport->scsi_target_id != -1) {
3273                                         scsi_target_unblock(&rport->dev,
3274                                                             SDEV_RUNNING);
3275                                         spin_lock_irqsave(shost->host_lock,
3276                                                           flags);
3277                                         rport->flags |= FC_RPORT_SCAN_PENDING;
3278                                         scsi_queue_work(shost,
3279                                                         &rport->scan_work);
3280                                         spin_unlock_irqrestore(shost->host_lock,
3281                                                         flags);
3282                                 }
3283
3284                                 fc_bsg_goose_queue(rport);
3285
3286                                 return rport;
3287                         }
3288                 }
3289         }
3290
3291         /*
3292          * Search the bindings array
3293          * Note: if never a FCP target, you won't be on this list
3294          */
3295         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3296
3297                 /* search for a matching consistent binding */
3298
3299                 list_for_each_entry(rport, &fc_host->rport_bindings,
3300                                         peers) {
3301                         if (rport->channel != channel)
3302                                 continue;
3303
3304                         switch (fc_host->tgtid_bind_type) {
3305                         case FC_TGTID_BIND_BY_WWPN:
3306                                 if (rport->port_name == ids->port_name)
3307                                         match = 1;
3308                                 break;
3309                         case FC_TGTID_BIND_BY_WWNN:
3310                                 if (rport->node_name == ids->node_name)
3311                                         match = 1;
3312                                 break;
3313                         case FC_TGTID_BIND_BY_ID:
3314                                 if (rport->port_id == ids->port_id)
3315                                         match = 1;
3316                                 break;
3317                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3318                                 break;
3319                         }
3320
3321                         if (match) {
3322                                 list_move_tail(&rport->peers, &fc_host->rports);
3323                                 break;
3324                         }
3325                 }
3326
3327                 if (match) {
3328                         memcpy(&rport->node_name, &ids->node_name,
3329                                 sizeof(rport->node_name));
3330                         memcpy(&rport->port_name, &ids->port_name,
3331                                 sizeof(rport->port_name));
3332                         rport->port_id = ids->port_id;
3333                         rport->port_state = FC_PORTSTATE_ONLINE;
3334                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3335
3336                         if (fci->f->dd_fcrport_size)
3337                                 memset(rport->dd_data, 0,
3338                                                 fci->f->dd_fcrport_size);
3339                         spin_unlock_irqrestore(shost->host_lock, flags);
3340
3341                         fc_remote_port_rolechg(rport, ids->roles);
3342                         return rport;
3343                 }
3344         }
3345
3346         spin_unlock_irqrestore(shost->host_lock, flags);
3347
3348         /* No consistent binding found - create new remote port entry */
3349         rport = fc_remote_port_create(shost, channel, ids);
3350
3351         return rport;
3352 }
3353 EXPORT_SYMBOL(fc_remote_port_add);
3354
3355
3356 /**
3357  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3358  * @rport:      The remote port that no longer exists
3359  *
3360  * The LLDD calls this routine to notify the transport that a remote
3361  * port is no longer part of the topology. Note: Although a port
3362  * may no longer be part of the topology, it may persist in the remote
3363  * ports displayed by the fc_host. We do this under 2 conditions:
3364  *
3365  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3366  *    This allows the port to temporarily disappear, then reappear without
3367  *    disrupting the SCSI device tree attached to it. During the "blocked"
3368  *    period the port will still exist.
3369  *
3370  * 2) If the port was a scsi target and disappears for longer than we
3371  *    expect, we'll delete the port and the tear down the SCSI device tree
3372  *    attached to it. However, we want to semi-persist the target id assigned
3373  *    to that port if it eventually does exist. The port structure will
3374  *    remain (although with minimal information) so that the target id
3375  *    bindings also remain.
3376  *
3377  * If the remote port is not an FCP Target, it will be fully torn down
3378  * and deallocated, including the fc_remote_port class device.
3379  *
3380  * If the remote port is an FCP Target, the port will be placed in a
3381  * temporary blocked state. From the LLDD's perspective, the rport no
3382  * longer exists. From the SCSI midlayer's perspective, the SCSI target
3383  * exists, but all sdevs on it are blocked from further I/O. The following
3384  * is then expected.
3385  *
3386  *   If the remote port does not return (signaled by a LLDD call to
3387  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3388  *   scsi target is removed - killing all outstanding i/o and removing the
3389  *   scsi devices attached to it. The port structure will be marked Not
3390  *   Present and be partially cleared, leaving only enough information to
3391  *   recognize the remote port relative to the scsi target id binding if
3392  *   it later appears.  The port will remain as long as there is a valid
3393  *   binding (e.g. until the user changes the binding type or unloads the
3394  *   scsi host with the binding).
3395  *
3396  *   If the remote port returns within the dev_loss_tmo value (and matches
3397  *   according to the target id binding type), the port structure will be
3398  *   reused. If it is no longer a SCSI target, the target will be torn
3399  *   down. If it continues to be a SCSI target, then the target will be
3400  *   unblocked (allowing i/o to be resumed), and a scan will be activated
3401  *   to ensure that all luns are detected.
3402  *
3403  * Called from normal process context only - cannot be called from interrupt.
3404  *
3405  * Notes:
3406  *      This routine assumes no locks are held on entry.
3407  */
3408 void
3409 fc_remote_port_delete(struct fc_rport  *rport)
3410 {
3411         struct Scsi_Host *shost = rport_to_shost(rport);
3412         unsigned long timeout = rport->dev_loss_tmo;
3413         unsigned long flags;
3414
3415         /*
3416          * No need to flush the fc_host work_q's, as all adds are synchronous.
3417          *
3418          * We do need to reclaim the rport scan work element, so eventually
3419          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3420          * there's still a scan pending.
3421          */
3422
3423         spin_lock_irqsave(shost->host_lock, flags);
3424
3425         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3426                 (rport->port_state != FC_PORTSTATE_MARGINAL)) {
3427                 spin_unlock_irqrestore(shost->host_lock, flags);
3428                 return;
3429         }
3430
3431         /*
3432          * In the past, we if this was not an FCP-Target, we would
3433          * unconditionally just jump to deleting the rport.
3434          * However, rports can be used as node containers by the LLDD,
3435          * and its not appropriate to just terminate the rport at the
3436          * first sign of a loss in connectivity. The LLDD may want to
3437          * send ELS traffic to re-validate the login. If the rport is
3438          * immediately deleted, it makes it inappropriate for a node
3439          * container.
3440          * So... we now unconditionally wait dev_loss_tmo before
3441          * destroying an rport.
3442          */
3443
3444         rport->port_state = FC_PORTSTATE_BLOCKED;
3445
3446         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3447
3448         spin_unlock_irqrestore(shost->host_lock, flags);
3449
3450         scsi_target_block(&rport->dev);
3451
3452         /* see if we need to kill io faster than waiting for device loss */
3453         if ((rport->fast_io_fail_tmo != -1) &&
3454             (rport->fast_io_fail_tmo < timeout))
3455                 fc_queue_devloss_work(shost, &rport->fail_io_work,
3456                                         rport->fast_io_fail_tmo * HZ);
3457
3458         /* cap the length the devices can be blocked until they are deleted */
3459         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3460 }
3461 EXPORT_SYMBOL(fc_remote_port_delete);
3462
3463 /**
3464  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3465  * @rport:      The remote port that changed.
3466  * @roles:      New roles for this port.
3467  *
3468  * Description: The LLDD calls this routine to notify the transport that the
3469  * roles on a remote port may have changed. The largest effect of this is
3470  * if a port now becomes a FCP Target, it must be allocated a
3471  * scsi target id.  If the port is no longer a FCP target, any
3472  * scsi target id value assigned to it will persist in case the
3473  * role changes back to include FCP Target. No changes in the scsi
3474  * midlayer will be invoked if the role changes (in the expectation
3475  * that the role will be resumed. If it doesn't normal error processing
3476  * will take place).
3477  *
3478  * Should not be called from interrupt context.
3479  *
3480  * Notes:
3481  *      This routine assumes no locks are held on entry.
3482  */
3483 void
3484 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3485 {
3486         struct Scsi_Host *shost = rport_to_shost(rport);
3487         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3488         unsigned long flags;
3489         int create = 0;
3490
3491         spin_lock_irqsave(shost->host_lock, flags);
3492         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3493                 if (rport->scsi_target_id == -1) {
3494                         rport->scsi_target_id = fc_host->next_target_id++;
3495                         create = 1;
3496                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3497                         create = 1;
3498         }
3499
3500         rport->roles = roles;
3501
3502         spin_unlock_irqrestore(shost->host_lock, flags);
3503
3504         if (create) {
3505                 /*
3506                  * There may have been a delete timer running on the
3507                  * port. Ensure that it is cancelled as we now know
3508                  * the port is an FCP Target.
3509                  * Note: we know the rport exists and is in an online
3510                  *  state as the LLDD would not have had an rport
3511                  *  reference to pass us.
3512                  *
3513                  * Take no action on the del_timer failure as the state
3514                  * machine state change will validate the
3515                  * transaction.
3516                  */
3517                 if (!cancel_delayed_work(&rport->fail_io_work))
3518                         fc_flush_devloss(shost);
3519                 if (!cancel_delayed_work(&rport->dev_loss_work))
3520                         fc_flush_devloss(shost);
3521
3522                 spin_lock_irqsave(shost->host_lock, flags);
3523                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3524                                   FC_RPORT_DEVLOSS_PENDING |
3525                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3526                 spin_unlock_irqrestore(shost->host_lock, flags);
3527
3528                 /* ensure any stgt delete functions are done */
3529                 fc_flush_work(shost);
3530
3531                 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3532                 /* initiate a scan of the target */
3533                 spin_lock_irqsave(shost->host_lock, flags);
3534                 rport->flags |= FC_RPORT_SCAN_PENDING;
3535                 scsi_queue_work(shost, &rport->scan_work);
3536                 spin_unlock_irqrestore(shost->host_lock, flags);
3537         }
3538 }
3539 EXPORT_SYMBOL(fc_remote_port_rolechg);
3540
3541 /**
3542  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3543  * @work:       rport target that failed to reappear in the allotted time.
3544  *
3545  * Description: An attempt to delete a remote port blocks, and if it fails
3546  *              to return in the allotted time this gets called.
3547  */
3548 static void
3549 fc_timeout_deleted_rport(struct work_struct *work)
3550 {
3551         struct fc_rport *rport =
3552                 container_of(work, struct fc_rport, dev_loss_work.work);
3553         struct Scsi_Host *shost = rport_to_shost(rport);
3554         struct fc_internal *i = to_fc_internal(shost->transportt);
3555         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3556         unsigned long flags;
3557         int do_callback = 0;
3558
3559         spin_lock_irqsave(shost->host_lock, flags);
3560
3561         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3562
3563         /*
3564          * If the port is ONLINE, then it came back. If it was a SCSI
3565          * target, validate it still is. If not, tear down the
3566          * scsi_target on it.
3567          */
3568         if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3569                 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3570             (rport->scsi_target_id != -1) &&
3571             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3572                 dev_printk(KERN_ERR, &rport->dev,
3573                         "blocked FC remote port time out: no longer"
3574                         " a FCP target, removing starget\n");
3575                 spin_unlock_irqrestore(shost->host_lock, flags);
3576                 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3577                 fc_queue_work(shost, &rport->stgt_delete_work);
3578                 return;
3579         }
3580
3581         /* NOOP state - we're flushing workq's */
3582         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3583                 spin_unlock_irqrestore(shost->host_lock, flags);
3584                 dev_printk(KERN_ERR, &rport->dev,
3585                         "blocked FC remote port time out: leaving"
3586                         " rport%s alone\n",
3587                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3588                 return;
3589         }
3590
3591         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3592             (rport->scsi_target_id == -1)) {
3593                 list_del(&rport->peers);
3594                 rport->port_state = FC_PORTSTATE_DELETED;
3595                 dev_printk(KERN_ERR, &rport->dev,
3596                         "blocked FC remote port time out: removing"
3597                         " rport%s\n",
3598                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3599                 fc_queue_work(shost, &rport->rport_delete_work);
3600                 spin_unlock_irqrestore(shost->host_lock, flags);
3601                 return;
3602         }
3603
3604         dev_printk(KERN_ERR, &rport->dev,
3605                 "blocked FC remote port time out: removing target and "
3606                 "saving binding\n");
3607
3608         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3609
3610         /*
3611          * Note: We do not remove or clear the hostdata area. This allows
3612          *   host-specific target data to persist along with the
3613          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3614          */
3615
3616         /*
3617          * Reinitialize port attributes that may change if the port comes back.
3618          */
3619         rport->maxframe_size = -1;
3620         rport->supported_classes = FC_COS_UNSPECIFIED;
3621         rport->roles = FC_PORT_ROLE_UNKNOWN;
3622         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3623         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3624
3625         /*
3626          * Pre-emptively kill I/O rather than waiting for the work queue
3627          * item to teardown the starget. (FCOE libFC folks prefer this
3628          * and to have the rport_port_id still set when it's done).
3629          */
3630         spin_unlock_irqrestore(shost->host_lock, flags);
3631         fc_terminate_rport_io(rport);
3632
3633         spin_lock_irqsave(shost->host_lock, flags);
3634
3635         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3636
3637                 /* remove the identifiers that aren't used in the consisting binding */
3638                 switch (fc_host->tgtid_bind_type) {
3639                 case FC_TGTID_BIND_BY_WWPN:
3640                         rport->node_name = -1;
3641                         rport->port_id = -1;
3642                         break;
3643                 case FC_TGTID_BIND_BY_WWNN:
3644                         rport->port_name = -1;
3645                         rport->port_id = -1;
3646                         break;
3647                 case FC_TGTID_BIND_BY_ID:
3648                         rport->node_name = -1;
3649                         rport->port_name = -1;
3650                         break;
3651                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3652                         break;
3653                 }
3654
3655                 /*
3656                  * As this only occurs if the remote port (scsi target)
3657                  * went away and didn't come back - we'll remove
3658                  * all attached scsi devices.
3659                  */
3660                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3661                 fc_queue_work(shost, &rport->stgt_delete_work);
3662
3663                 do_callback = 1;
3664         }
3665
3666         spin_unlock_irqrestore(shost->host_lock, flags);
3667
3668         /*
3669          * Notify the driver that the rport is now dead. The LLDD will
3670          * also guarantee that any communication to the rport is terminated
3671          *
3672          * Note: we set the CALLBK_DONE flag above to correspond
3673          */
3674         if (do_callback && i->f->dev_loss_tmo_callbk)
3675                 i->f->dev_loss_tmo_callbk(rport);
3676 }
3677
3678
3679 /**
3680  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3681  * @work:       rport to terminate io on.
3682  *
3683  * Notes: Only requests the failure of the io, not that all are flushed
3684  *    prior to returning.
3685  */
3686 static void
3687 fc_timeout_fail_rport_io(struct work_struct *work)
3688 {
3689         struct fc_rport *rport =
3690                 container_of(work, struct fc_rport, fail_io_work.work);
3691
3692         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3693                 return;
3694
3695         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3696         fc_terminate_rport_io(rport);
3697 }
3698
3699 /**
3700  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3701  * @work:       remote port to be scanned.
3702  */
3703 static void
3704 fc_scsi_scan_rport(struct work_struct *work)
3705 {
3706         struct fc_rport *rport =
3707                 container_of(work, struct fc_rport, scan_work);
3708         struct Scsi_Host *shost = rport_to_shost(rport);
3709         struct fc_internal *i = to_fc_internal(shost->transportt);
3710         unsigned long flags;
3711
3712         if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3713                 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3714             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3715             !(i->f->disable_target_scan)) {
3716                 scsi_scan_target(&rport->dev, rport->channel,
3717                                  rport->scsi_target_id, SCAN_WILD_CARD,
3718                                  SCSI_SCAN_RESCAN);
3719         }
3720
3721         spin_lock_irqsave(shost->host_lock, flags);
3722         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3723         spin_unlock_irqrestore(shost->host_lock, flags);
3724 }
3725
3726 /**
3727  * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3728  * @rport: Remote port that scsi_eh is trying to recover.
3729  *
3730  * This routine can be called from a FC LLD scsi_eh callback. It
3731  * blocks the scsi_eh thread until the fc_rport leaves the
3732  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3733  * necessary to avoid the scsi_eh failing recovery actions for blocked
3734  * rports which would lead to offlined SCSI devices.
3735  *
3736  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3737  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3738  *          passed back to scsi_eh.
3739  */
3740 int fc_block_rport(struct fc_rport *rport)
3741 {
3742         struct Scsi_Host *shost = rport_to_shost(rport);
3743         unsigned long flags;
3744
3745         spin_lock_irqsave(shost->host_lock, flags);
3746         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3747                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3748                 spin_unlock_irqrestore(shost->host_lock, flags);
3749                 msleep(1000);
3750                 spin_lock_irqsave(shost->host_lock, flags);
3751         }
3752         spin_unlock_irqrestore(shost->host_lock, flags);
3753
3754         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3755                 return FAST_IO_FAIL;
3756
3757         return 0;
3758 }
3759 EXPORT_SYMBOL(fc_block_rport);
3760
3761 /**
3762  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3763  * @cmnd: SCSI command that scsi_eh is trying to recover
3764  *
3765  * This routine can be called from a FC LLD scsi_eh callback. It
3766  * blocks the scsi_eh thread until the fc_rport leaves the
3767  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3768  * necessary to avoid the scsi_eh failing recovery actions for blocked
3769  * rports which would lead to offlined SCSI devices.
3770  *
3771  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3772  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3773  *          passed back to scsi_eh.
3774  */
3775 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3776 {
3777         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3778
3779         if (WARN_ON_ONCE(!rport))
3780                 return FAST_IO_FAIL;
3781
3782         return fc_block_rport(rport);
3783 }
3784 EXPORT_SYMBOL(fc_block_scsi_eh);
3785
3786 /*
3787  * fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3788  * @scmd:        The SCSI command to be checked
3789  *
3790  * This checks the rport state to decide if a cmd is
3791  * retryable.
3792  *
3793  * Returns: true if the rport state is not in marginal state.
3794  */
3795 bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3796 {
3797         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3798
3799         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3800                 (scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3801                 set_host_byte(scmd, DID_TRANSPORT_MARGINAL);
3802                 return false;
3803         }
3804         return true;
3805 }
3806 EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3807
3808 /**
3809  * fc_vport_setup - allocates and creates a FC virtual port.
3810  * @shost:      scsi host the virtual port is connected to.
3811  * @channel:    Channel on shost port connected to.
3812  * @pdev:       parent device for vport
3813  * @ids:        The world wide names, FC4 port roles, etc for
3814  *              the virtual port.
3815  * @ret_vport:  The pointer to the created vport.
3816  *
3817  * Allocates and creates the vport structure, calls the parent host
3818  * to instantiate the vport, this completes w/ class and sysfs creation.
3819  *
3820  * Notes:
3821  *      This routine assumes no locks are held on entry.
3822  */
3823 static int
3824 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3825         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3826 {
3827         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3828         struct fc_internal *fci = to_fc_internal(shost->transportt);
3829         struct fc_vport *vport;
3830         struct device *dev;
3831         unsigned long flags;
3832         size_t size;
3833         int error;
3834
3835         *ret_vport = NULL;
3836
3837         if ( ! fci->f->vport_create)
3838                 return -ENOENT;
3839
3840         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3841         vport = kzalloc(size, GFP_KERNEL);
3842         if (unlikely(!vport)) {
3843                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3844                 return -ENOMEM;
3845         }
3846
3847         vport->vport_state = FC_VPORT_UNKNOWN;
3848         vport->vport_last_state = FC_VPORT_UNKNOWN;
3849         vport->node_name = ids->node_name;
3850         vport->port_name = ids->port_name;
3851         vport->roles = ids->roles;
3852         vport->vport_type = ids->vport_type;
3853         if (fci->f->dd_fcvport_size)
3854                 vport->dd_data = &vport[1];
3855         vport->shost = shost;
3856         vport->channel = channel;
3857         vport->flags = FC_VPORT_CREATING;
3858         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3859
3860         spin_lock_irqsave(shost->host_lock, flags);
3861
3862         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3863                 spin_unlock_irqrestore(shost->host_lock, flags);
3864                 kfree(vport);
3865                 return -ENOSPC;
3866         }
3867         fc_host->npiv_vports_inuse++;
3868         vport->number = fc_host->next_vport_number++;
3869         list_add_tail(&vport->peers, &fc_host->vports);
3870         scsi_host_get(shost);                   /* for fc_host->vport list */
3871
3872         spin_unlock_irqrestore(shost->host_lock, flags);
3873
3874         dev = &vport->dev;
3875         device_initialize(dev);                 /* takes self reference */
3876         dev->parent = get_device(pdev);         /* takes parent reference */
3877         dev->release = fc_vport_dev_release;
3878         dev_set_name(dev, "vport-%d:%d-%d",
3879                      shost->host_no, channel, vport->number);
3880         transport_setup_device(dev);
3881
3882         error = device_add(dev);
3883         if (error) {
3884                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3885                 goto delete_vport;
3886         }
3887         transport_add_device(dev);
3888         transport_configure_device(dev);
3889
3890         error = fci->f->vport_create(vport, ids->disable);
3891         if (error) {
3892                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3893                 goto delete_vport_all;
3894         }
3895
3896         /*
3897          * if the parent isn't the physical adapter's Scsi_Host, ensure
3898          * the Scsi_Host at least contains a symlink to the vport.
3899          */
3900         if (pdev != &shost->shost_gendev) {
3901                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3902                                  &dev->kobj, dev_name(dev));
3903                 if (error)
3904                         printk(KERN_ERR
3905                                 "%s: Cannot create vport symlinks for "
3906                                 "%s, err=%d\n",
3907                                 __func__, dev_name(dev), error);
3908         }
3909         spin_lock_irqsave(shost->host_lock, flags);
3910         vport->flags &= ~FC_VPORT_CREATING;
3911         spin_unlock_irqrestore(shost->host_lock, flags);
3912
3913         dev_printk(KERN_NOTICE, pdev,
3914                         "%s created via shost%d channel %d\n", dev_name(dev),
3915                         shost->host_no, channel);
3916
3917         *ret_vport = vport;
3918
3919         return 0;
3920
3921 delete_vport_all:
3922         transport_remove_device(dev);
3923         device_del(dev);
3924 delete_vport:
3925         transport_destroy_device(dev);
3926         spin_lock_irqsave(shost->host_lock, flags);
3927         list_del(&vport->peers);
3928         scsi_host_put(shost);                   /* for fc_host->vport list */
3929         fc_host->npiv_vports_inuse--;
3930         spin_unlock_irqrestore(shost->host_lock, flags);
3931         put_device(dev->parent);
3932         kfree(vport);
3933
3934         return error;
3935 }
3936
3937 /**
3938  * fc_vport_create - Admin App or LLDD requests creation of a vport
3939  * @shost:      scsi host the virtual port is connected to.
3940  * @channel:    channel on shost port connected to.
3941  * @ids:        The world wide names, FC4 port roles, etc for
3942  *              the virtual port.
3943  *
3944  * Notes:
3945  *      This routine assumes no locks are held on entry.
3946  */
3947 struct fc_vport *
3948 fc_vport_create(struct Scsi_Host *shost, int channel,
3949         struct fc_vport_identifiers *ids)
3950 {
3951         int stat;
3952         struct fc_vport *vport;
3953
3954         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3955                  ids, &vport);
3956         return stat ? NULL : vport;
3957 }
3958 EXPORT_SYMBOL(fc_vport_create);
3959
3960 /**
3961  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3962  * @vport:      fc_vport to be terminated
3963  *
3964  * Calls the LLDD vport_delete() function, then deallocates and removes
3965  * the vport from the shost and object tree.
3966  *
3967  * Notes:
3968  *      This routine assumes no locks are held on entry.
3969  */
3970 int
3971 fc_vport_terminate(struct fc_vport *vport)
3972 {
3973         struct Scsi_Host *shost = vport_to_shost(vport);
3974         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3975         struct fc_internal *i = to_fc_internal(shost->transportt);
3976         struct device *dev = &vport->dev;
3977         unsigned long flags;
3978         int stat;
3979
3980         if (i->f->vport_delete)
3981                 stat = i->f->vport_delete(vport);
3982         else
3983                 stat = -ENOENT;
3984
3985         spin_lock_irqsave(shost->host_lock, flags);
3986         vport->flags &= ~FC_VPORT_DELETING;
3987         if (!stat) {
3988                 vport->flags |= FC_VPORT_DELETED;
3989                 list_del(&vport->peers);
3990                 fc_host->npiv_vports_inuse--;
3991                 scsi_host_put(shost);           /* for fc_host->vport list */
3992         }
3993         spin_unlock_irqrestore(shost->host_lock, flags);
3994
3995         if (stat)
3996                 return stat;
3997
3998         if (dev->parent != &shost->shost_gendev)
3999                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
4000         transport_remove_device(dev);
4001         device_del(dev);
4002         transport_destroy_device(dev);
4003
4004         /*
4005          * Removing our self-reference should mean our
4006          * release function gets called, which will drop the remaining
4007          * parent reference and free the data structure.
4008          */
4009         put_device(dev);                        /* for self-reference */
4010
4011         return 0; /* SUCCESS */
4012 }
4013 EXPORT_SYMBOL(fc_vport_terminate);
4014
4015 /**
4016  * fc_vport_sched_delete - workq-based delete request for a vport
4017  * @work:       vport to be deleted.
4018  */
4019 static void
4020 fc_vport_sched_delete(struct work_struct *work)
4021 {
4022         struct fc_vport *vport =
4023                 container_of(work, struct fc_vport, vport_delete_work);
4024         int stat;
4025
4026         stat = fc_vport_terminate(vport);
4027         if (stat)
4028                 dev_printk(KERN_ERR, vport->dev.parent,
4029                         "%s: %s could not be deleted created via "
4030                         "shost%d channel %d - error %d\n", __func__,
4031                         dev_name(&vport->dev), vport->shost->host_no,
4032                         vport->channel, stat);
4033 }
4034
4035
4036 /*
4037  * BSG support
4038  */
4039
4040 /**
4041  * fc_bsg_job_timeout - handler for when a bsg request timesout
4042  * @req:        request that timed out
4043  */
4044 static enum blk_eh_timer_return
4045 fc_bsg_job_timeout(struct request *req)
4046 {
4047         struct bsg_job *job = blk_mq_rq_to_pdu(req);
4048         struct Scsi_Host *shost = fc_bsg_to_shost(job);
4049         struct fc_rport *rport = fc_bsg_to_rport(job);
4050         struct fc_internal *i = to_fc_internal(shost->transportt);
4051         int err = 0, inflight = 0;
4052
4053         if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4054                 return BLK_EH_RESET_TIMER;
4055
4056         inflight = bsg_job_get(job);
4057
4058         if (inflight && i->f->bsg_timeout) {
4059                 /* call LLDD to abort the i/o as it has timed out */
4060                 err = i->f->bsg_timeout(job);
4061                 if (err == -EAGAIN) {
4062                         bsg_job_put(job);
4063                         return BLK_EH_RESET_TIMER;
4064                 } else if (err)
4065                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4066                                 "abort failed with status %d\n", err);
4067         }
4068
4069         /* the blk_end_sync_io() doesn't check the error */
4070         if (inflight)
4071                 blk_mq_end_request(req, BLK_STS_IOERR);
4072         return BLK_EH_DONE;
4073 }
4074
4075 /**
4076  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4077  * @shost:      scsi host rport attached to
4078  * @job:        bsg job to be processed
4079  */
4080 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4081 {
4082         struct fc_internal *i = to_fc_internal(shost->transportt);
4083         struct fc_bsg_request *bsg_request = job->request;
4084         struct fc_bsg_reply *bsg_reply = job->reply;
4085         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4086         int ret;
4087
4088         /* check if we really have all the request data needed */
4089         if (job->request_len < cmdlen) {
4090                 ret = -ENOMSG;
4091                 goto fail_host_msg;
4092         }
4093
4094         /* Validate the host command */
4095         switch (bsg_request->msgcode) {
4096         case FC_BSG_HST_ADD_RPORT:
4097                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4098                 break;
4099
4100         case FC_BSG_HST_DEL_RPORT:
4101                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4102                 break;
4103
4104         case FC_BSG_HST_ELS_NOLOGIN:
4105                 cmdlen += sizeof(struct fc_bsg_host_els);
4106                 /* there better be a xmt and rcv payloads */
4107                 if ((!job->request_payload.payload_len) ||
4108                     (!job->reply_payload.payload_len)) {
4109                         ret = -EINVAL;
4110                         goto fail_host_msg;
4111                 }
4112                 break;
4113
4114         case FC_BSG_HST_CT:
4115                 cmdlen += sizeof(struct fc_bsg_host_ct);
4116                 /* there better be xmt and rcv payloads */
4117                 if ((!job->request_payload.payload_len) ||
4118                     (!job->reply_payload.payload_len)) {
4119                         ret = -EINVAL;
4120                         goto fail_host_msg;
4121                 }
4122                 break;
4123
4124         case FC_BSG_HST_VENDOR:
4125                 cmdlen += sizeof(struct fc_bsg_host_vendor);
4126                 if ((shost->hostt->vendor_id == 0L) ||
4127                     (bsg_request->rqst_data.h_vendor.vendor_id !=
4128                         shost->hostt->vendor_id)) {
4129                         ret = -ESRCH;
4130                         goto fail_host_msg;
4131                 }
4132                 break;
4133
4134         default:
4135                 ret = -EBADR;
4136                 goto fail_host_msg;
4137         }
4138
4139         ret = i->f->bsg_request(job);
4140         if (!ret)
4141                 return 0;
4142
4143 fail_host_msg:
4144         /* return the errno failure code as the only status */
4145         BUG_ON(job->reply_len < sizeof(uint32_t));
4146         bsg_reply->reply_payload_rcv_len = 0;
4147         bsg_reply->result = ret;
4148         job->reply_len = sizeof(uint32_t);
4149         bsg_job_done(job, bsg_reply->result,
4150                        bsg_reply->reply_payload_rcv_len);
4151         return 0;
4152 }
4153
4154
4155 /*
4156  * fc_bsg_goose_queue - restart rport queue in case it was stopped
4157  * @rport:      rport to be restarted
4158  */
4159 static void
4160 fc_bsg_goose_queue(struct fc_rport *rport)
4161 {
4162         struct request_queue *q = rport->rqst_q;
4163
4164         if (q)
4165                 blk_mq_run_hw_queues(q, true);
4166 }
4167
4168 /**
4169  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4170  * @shost:      scsi host rport attached to
4171  * @job:        bsg job to be processed
4172  */
4173 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4174 {
4175         struct fc_internal *i = to_fc_internal(shost->transportt);
4176         struct fc_bsg_request *bsg_request = job->request;
4177         struct fc_bsg_reply *bsg_reply = job->reply;
4178         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4179         int ret;
4180
4181         /* check if we really have all the request data needed */
4182         if (job->request_len < cmdlen) {
4183                 ret = -ENOMSG;
4184                 goto fail_rport_msg;
4185         }
4186
4187         /* Validate the rport command */
4188         switch (bsg_request->msgcode) {
4189         case FC_BSG_RPT_ELS:
4190                 cmdlen += sizeof(struct fc_bsg_rport_els);
4191                 goto check_bidi;
4192
4193         case FC_BSG_RPT_CT:
4194                 cmdlen += sizeof(struct fc_bsg_rport_ct);
4195 check_bidi:
4196                 /* there better be xmt and rcv payloads */
4197                 if ((!job->request_payload.payload_len) ||
4198                     (!job->reply_payload.payload_len)) {
4199                         ret = -EINVAL;
4200                         goto fail_rport_msg;
4201                 }
4202                 break;
4203         default:
4204                 ret = -EBADR;
4205                 goto fail_rport_msg;
4206         }
4207
4208         ret = i->f->bsg_request(job);
4209         if (!ret)
4210                 return 0;
4211
4212 fail_rport_msg:
4213         /* return the errno failure code as the only status */
4214         BUG_ON(job->reply_len < sizeof(uint32_t));
4215         bsg_reply->reply_payload_rcv_len = 0;
4216         bsg_reply->result = ret;
4217         job->reply_len = sizeof(uint32_t);
4218         bsg_job_done(job, bsg_reply->result,
4219                        bsg_reply->reply_payload_rcv_len);
4220         return 0;
4221 }
4222
4223 static int fc_bsg_dispatch(struct bsg_job *job)
4224 {
4225         struct Scsi_Host *shost = fc_bsg_to_shost(job);
4226
4227         if (scsi_is_fc_rport(job->dev))
4228                 return fc_bsg_rport_dispatch(shost, job);
4229         else
4230                 return fc_bsg_host_dispatch(shost, job);
4231 }
4232
4233 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4234 {
4235         if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4236             !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4237                 return BLK_STS_RESOURCE;
4238
4239         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4240                 (rport->port_state != FC_PORTSTATE_MARGINAL))
4241                 return BLK_STS_IOERR;
4242
4243         return BLK_STS_OK;
4244 }
4245
4246
4247 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4248 {
4249         struct fc_rport *rport = fc_bsg_to_rport(job);
4250         blk_status_t ret;
4251
4252         ret = fc_bsg_rport_prep(rport);
4253         switch (ret) {
4254         case BLK_STS_OK:
4255                 break;
4256         case BLK_STS_RESOURCE:
4257                 return -EAGAIN;
4258         default:
4259                 return -EIO;
4260         }
4261
4262         return fc_bsg_dispatch(job);
4263 }
4264
4265 /**
4266  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4267  * @shost:      shost for fc_host
4268  * @fc_host:    fc_host adding the structures to
4269  */
4270 static int
4271 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4272 {
4273         struct device *dev = &shost->shost_gendev;
4274         struct fc_internal *i = to_fc_internal(shost->transportt);
4275         struct request_queue *q;
4276         char bsg_name[20];
4277
4278         fc_host->rqst_q = NULL;
4279
4280         if (!i->f->bsg_request)
4281                 return -ENOTSUPP;
4282
4283         snprintf(bsg_name, sizeof(bsg_name),
4284                  "fc_host%d", shost->host_no);
4285
4286         q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
4287                                 i->f->dd_bsg_size);
4288         if (IS_ERR(q)) {
4289                 dev_err(dev,
4290                         "fc_host%d: bsg interface failed to initialize - setup queue\n",
4291                         shost->host_no);
4292                 return PTR_ERR(q);
4293         }
4294         __scsi_init_queue(shost, q);
4295         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4296         fc_host->rqst_q = q;
4297         return 0;
4298 }
4299
4300 /**
4301  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4302  * @shost:      shost that rport is attached to
4303  * @rport:      rport that the bsg hooks are being attached to
4304  */
4305 static int
4306 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4307 {
4308         struct device *dev = &rport->dev;
4309         struct fc_internal *i = to_fc_internal(shost->transportt);
4310         struct request_queue *q;
4311
4312         rport->rqst_q = NULL;
4313
4314         if (!i->f->bsg_request)
4315                 return -ENOTSUPP;
4316
4317         q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
4318                                 fc_bsg_job_timeout, i->f->dd_bsg_size);
4319         if (IS_ERR(q)) {
4320                 dev_err(dev, "failed to setup bsg queue\n");
4321                 return PTR_ERR(q);
4322         }
4323         __scsi_init_queue(shost, q);
4324         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4325         rport->rqst_q = q;
4326         return 0;
4327 }
4328
4329
4330 /**
4331  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4332  * @q:  the request_queue that is to be torn down.
4333  *
4334  * Notes:
4335  *   Before unregistering the queue empty any requests that are blocked
4336  *
4337  *
4338  */
4339 static void
4340 fc_bsg_remove(struct request_queue *q)
4341 {
4342         bsg_remove_queue(q);
4343 }
4344
4345
4346 /* Original Author:  Martin Hicks */
4347 MODULE_AUTHOR("James Smart");
4348 MODULE_DESCRIPTION("FC Transport Attributes");
4349 MODULE_LICENSE("GPL");
4350
4351 module_init(fc_transport_init);
4352 module_exit(fc_transport_exit);