drivers/s390/scsi/zfcp_fc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Fibre Channel related functions for the zfcp device driver.
   6  *
   7  * Copyright IBM Corp. 2008, 2017
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <linux/utsname.h>
  16 #include <linux/random.h>
  17 #include <linux/bsg-lib.h>
  18 #include <scsi/fc/fc_els.h>
  19 #include <scsi/libfc.h>
  20 #include "zfcp_ext.h"
  21 #include "zfcp_fc.h"
  22
  23 struct kmem_cache *zfcp_fc_req_cache;
  24
  25 static u32 zfcp_fc_rscn_range_mask[] = {
  26         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  27         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  28         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  29         [ELS_ADDR_FMT_FAB]              = 0x000000,
  30 };
  31
  32 static bool no_auto_port_rescan;
  33 module_param(no_auto_port_rescan, bool, 0600);
  34 MODULE_PARM_DESC(no_auto_port_rescan,
  35                  "no automatic port_rescan (default off)");
  36
  37 static unsigned int port_scan_backoff = 500;
  38 module_param(port_scan_backoff, uint, 0600);
  39 MODULE_PARM_DESC(port_scan_backoff,
  40         "upper limit of port scan random backoff in msecs (default 500)");
  41
  42 static unsigned int port_scan_ratelimit = 60000;
  43 module_param(port_scan_ratelimit, uint, 0600);
  44 MODULE_PARM_DESC(port_scan_ratelimit,
  45         "minimum interval between port scans in msecs (default 60000)");
  46
  47 unsigned int zfcp_fc_port_scan_backoff(void)
  48 {
  49         if (!port_scan_backoff)
  50                 return 0;
  51         return get_random_u32_below(port_scan_backoff);
  52 }
  53
  54 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
  55 {
  56         unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
  57         unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
  58
  59         adapter->next_port_scan = jiffies + interval + backoff;
  60 }
  61
  62 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
  63 {
  64         unsigned long now = jiffies;
  65         unsigned long next = adapter->next_port_scan;
  66         unsigned long delay = 0, max;
  67
  68         /* delay only needed within waiting period */
  69         if (time_before(now, next)) {
  70                 delay = next - now;
  71                 /* paranoia: never ever delay scans longer than specified */
  72                 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
  73                 delay = min(delay, max);
  74         }
  75
  76         queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
  77 }
  78
  79 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  80 {
  81         if (no_auto_port_rescan)
  82                 return;
  83
  84         zfcp_fc_port_scan(adapter);
  85 }
  86
  87 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  88 {
  89         if (!no_auto_port_rescan)
  90                 return;
  91
  92         zfcp_fc_port_scan(adapter);
  93 }
  94
  95 /**
  96  * zfcp_fc_post_event - post event to userspace via fc_transport
  97  * @work: work struct with enqueued events
  98  */
  99 void zfcp_fc_post_event(struct work_struct *work)
 100 {
 101         struct zfcp_fc_event *event = NULL, *tmp = NULL;
 102         LIST_HEAD(tmp_lh);
 103         struct zfcp_fc_events *events = container_of(work,
 104                                         struct zfcp_fc_events, work);
 105         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
 106                                                 events);
 107
 108         spin_lock_bh(&events->list_lock);
 109         list_splice_init(&events->list, &tmp_lh);
 110         spin_unlock_bh(&events->list_lock);
 111
 112         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
 113                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
 114                                    event->code, event->data);
 115                 list_del(&event->list);
 116                 kfree(event);
 117         }
 118 }
 119
 120 /**
 121  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
 122  * @adapter: The adapter where to enqueue the event
 123  * @event_code: The event code (as defined in fc_host_event_code in
 124  *              scsi_transport_fc.h)
 125  * @event_data: The event data (e.g. n_port page in case of els)
 126  */
 127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
 128                            enum fc_host_event_code event_code, u32 event_data)
 129 {
 130         struct zfcp_fc_event *event;
 131
 132         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
 133         if (!event)
 134                 return;
 135
 136         event->code = event_code;
 137         event->data = event_data;
 138
 139         spin_lock(&adapter->events.list_lock);
 140         list_add_tail(&event->list, &adapter->events.list);
 141         spin_unlock(&adapter->events.list_lock);
 142
 143         queue_work(adapter->work_queue, &adapter->events.work);
 144 }
 145
 146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 147 {
 148         int ret = -EIO;
 149
 150         if (mutex_lock_interruptible(&wka_port->mutex))
 151                 return -ERESTARTSYS;
 152
 153         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 154             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 155                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 156                 if (zfcp_fsf_open_wka_port(wka_port)) {
 157                         /* could not even send request, nothing to wait for */
 158                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 159                         goto out;
 160                 }
 161         }
 162
 163         wait_event(wka_port->opened,
 164                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 165                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 166
 167         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 168                 atomic_inc(&wka_port->refcount);
 169                 ret = 0;
 170                 goto out;
 171         }
 172 out:
 173         mutex_unlock(&wka_port->mutex);
 174         return ret;
 175 }
 176
 177 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 178 {
 179         struct delayed_work *dw = to_delayed_work(work);
 180         struct zfcp_fc_wka_port *wka_port =
 181                         container_of(dw, struct zfcp_fc_wka_port, work);
 182
 183         mutex_lock(&wka_port->mutex);
 184         if ((atomic_read(&wka_port->refcount) != 0) ||
 185             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 186                 goto out;
 187
 188         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 189         if (zfcp_fsf_close_wka_port(wka_port)) {
 190                 /* could not even send request, nothing to wait for */
 191                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 192                 goto out;
 193         }
 194         wait_event(wka_port->closed,
 195                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 196 out:
 197         mutex_unlock(&wka_port->mutex);
 198 }
 199
 200 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 201 {
 202         if (atomic_dec_return(&wka_port->refcount) != 0)
 203                 return;
 204         /* wait 10 milliseconds, other reqs might pop in */
 205         queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work,
 206                            msecs_to_jiffies(10));
 207 }
 208
 209 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 210                                   struct zfcp_adapter *adapter)
 211 {
 212         init_waitqueue_head(&wka_port->opened);
 213         init_waitqueue_head(&wka_port->closed);
 214
 215         wka_port->adapter = adapter;
 216         wka_port->d_id = d_id;
 217
 218         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 219         atomic_set(&wka_port->refcount, 0);
 220         mutex_init(&wka_port->mutex);
 221         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 222 }
 223
 224 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 225 {
 226         cancel_delayed_work_sync(&wka->work);
 227         mutex_lock(&wka->mutex);
 228         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 229         mutex_unlock(&wka->mutex);
 230 }
 231
 232 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 233 {
 234         if (!gs)
 235                 return;
 236         zfcp_fc_wka_port_force_offline(&gs->ms);
 237         zfcp_fc_wka_port_force_offline(&gs->ts);
 238         zfcp_fc_wka_port_force_offline(&gs->ds);
 239         zfcp_fc_wka_port_force_offline(&gs->as);
 240 }
 241
 242 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 243                                    struct fc_els_rscn_page *page)
 244 {
 245         unsigned long flags;
 246         struct zfcp_adapter *adapter = fsf_req->adapter;
 247         struct zfcp_port *port;
 248
 249         read_lock_irqsave(&adapter->port_list_lock, flags);
 250         list_for_each_entry(port, &adapter->port_list, list) {
 251                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 252                         zfcp_fc_test_link(port);
 253         }
 254         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 255 }
 256
 257 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 258 {
 259         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 260         struct zfcp_adapter *adapter = fsf_req->adapter;
 261         struct fc_els_rscn *head;
 262         struct fc_els_rscn_page *page;
 263         u16 i;
 264         u16 no_entries;
 265         unsigned int afmt;
 266
 267         head = (struct fc_els_rscn *) status_buffer->payload.data;
 268         page = (struct fc_els_rscn_page *) head;
 269
 270         /* see FC-FS */
 271         no_entries = be16_to_cpu(head->rscn_plen) /
 272                 sizeof(struct fc_els_rscn_page);
 273
 274         if (no_entries > 1) {
 275                 /* handle failed ports */
 276                 unsigned long flags;
 277                 struct zfcp_port *port;
 278
 279                 read_lock_irqsave(&adapter->port_list_lock, flags);
 280                 list_for_each_entry(port, &adapter->port_list, list) {
 281                         if (port->d_id)
 282                                 continue;
 283                         zfcp_erp_port_reopen(port,
 284                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 285                                              "fcrscn1");
 286                 }
 287                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
 288         }
 289
 290         for (i = 1; i < no_entries; i++) {
 291                 /* skip head and start with 1st element */
 292                 page++;
 293                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 294                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 295                                        page);
 296                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 297                                       *(u32 *)page);
 298         }
 299         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 300 }
 301
 302 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 303 {
 304         unsigned long flags;
 305         struct zfcp_adapter *adapter = req->adapter;
 306         struct zfcp_port *port;
 307
 308         read_lock_irqsave(&adapter->port_list_lock, flags);
 309         list_for_each_entry(port, &adapter->port_list, list)
 310                 if (port->wwpn == wwpn) {
 311                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 312                         break;
 313                 }
 314         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 315 }
 316
 317 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 318 {
 319         struct fsf_status_read_buffer *status_buffer;
 320         struct fc_els_flogi *plogi;
 321
 322         status_buffer = (struct fsf_status_read_buffer *) req->data;
 323         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 324         zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 325 }
 326
 327 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 328 {
 329         struct fsf_status_read_buffer *status_buffer =
 330                 (struct fsf_status_read_buffer *)req->data;
 331         struct fc_els_logo *logo =
 332                 (struct fc_els_logo *) status_buffer->payload.data;
 333
 334         zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 335 }
 336
 337 /**
 338  * zfcp_fc_incoming_els - handle incoming ELS
 339  * @fsf_req: request which contains incoming ELS
 340  */
 341 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 342 {
 343         struct fsf_status_read_buffer *status_buffer =
 344                 (struct fsf_status_read_buffer *) fsf_req->data;
 345         unsigned int els_type = status_buffer->payload.data[0];
 346
 347         zfcp_dbf_san_in_els("fciels1", fsf_req);
 348         if (els_type == ELS_PLOGI)
 349                 zfcp_fc_incoming_plogi(fsf_req);
 350         else if (els_type == ELS_LOGO)
 351                 zfcp_fc_incoming_logo(fsf_req);
 352         else if (els_type == ELS_RSCN)
 353                 zfcp_fc_incoming_rscn(fsf_req);
 354 }
 355
 356 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 357 {
 358         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 359         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 360
 361         if (ct_els->status)
 362                 return;
 363         if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 364                 return;
 365
 366         /* looks like a valid d_id */
 367         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 368 }
 369
 370 static void zfcp_fc_complete(void *data)
 371 {
 372         complete(data);
 373 }
 374
 375 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 376 {
 377         ct_hdr->ct_rev = FC_CT_REV;
 378         ct_hdr->ct_fs_type = FC_FST_DIR;
 379         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 380         ct_hdr->ct_cmd = cpu_to_be16(cmd);
 381         ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 382 }
 383
 384 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 385                                      struct zfcp_fc_req *fc_req)
 386 {
 387         struct zfcp_adapter *adapter = port->adapter;
 388         DECLARE_COMPLETION_ONSTACK(completion);
 389         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 390         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 391         int ret;
 392
 393         /* setup parameters for send generic command */
 394         fc_req->ct_els.port = port;
 395         fc_req->ct_els.handler = zfcp_fc_complete;
 396         fc_req->ct_els.handler_data = &completion;
 397         fc_req->ct_els.req = &fc_req->sg_req;
 398         fc_req->ct_els.resp = &fc_req->sg_rsp;
 399         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 400         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 401
 402         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 403                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 404         gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 405
 406         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 407                                adapter->pool.gid_pn_req,
 408                                ZFCP_FC_CTELS_TMO);
 409         if (!ret) {
 410                 wait_for_completion(&completion);
 411                 zfcp_fc_ns_gid_pn_eval(fc_req);
 412         }
 413         return ret;
 414 }
 415
 416 /**
 417  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 418  * @port: port where GID_PN request is needed
 419  * return: -ENOMEM on error, 0 otherwise
 420  */
 421 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 422 {
 423         int ret;
 424         struct zfcp_fc_req *fc_req;
 425         struct zfcp_adapter *adapter = port->adapter;
 426
 427         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 428         if (!fc_req)
 429                 return -ENOMEM;
 430
 431         memset(fc_req, 0, sizeof(*fc_req));
 432
 433         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 434         if (ret)
 435                 goto out;
 436
 437         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 438
 439         zfcp_fc_wka_port_put(&adapter->gs->ds);
 440 out:
 441         mempool_free(fc_req, adapter->pool.gid_pn);
 442         return ret;
 443 }
 444
 445 void zfcp_fc_port_did_lookup(struct work_struct *work)
 446 {
 447         int ret;
 448         struct zfcp_port *port = container_of(work, struct zfcp_port,
 449                                               gid_pn_work);
 450
 451         set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 452         ret = zfcp_fc_ns_gid_pn(port);
 453         if (ret) {
 454                 /* could not issue gid_pn for some reason */
 455                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 456                 goto out;
 457         }
 458
 459         if (!port->d_id) {
 460                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 461                 goto out;
 462         }
 463
 464         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 465 out:
 466         put_device(&port->dev);
 467 }
 468
 469 /**
 470  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 471  * @port: The zfcp_port to lookup the d_id for.
 472  */
 473 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 474 {
 475         get_device(&port->dev);
 476         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 477                 put_device(&port->dev);
 478 }
 479
 480 /**
 481  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 482  * @port: zfcp_port structure
 483  * @plogi: plogi payload
 484  *
 485  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 486  */
 487 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 488 {
 489         if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 490                 port->d_id = 0;
 491                 dev_warn(&port->adapter->ccw_device->dev,
 492                          "A port opened with WWPN 0x%016Lx returned data that "
 493                          "identifies it as WWPN 0x%016Lx\n",
 494                          (unsigned long long) port->wwpn,
 495                          (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 496                 return;
 497         }
 498
 499         port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 500         port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 501
 502         if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 503                 port->supported_classes |= FC_COS_CLASS1;
 504         if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 505                 port->supported_classes |= FC_COS_CLASS2;
 506         if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 507                 port->supported_classes |= FC_COS_CLASS3;
 508         if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 509                 port->supported_classes |= FC_COS_CLASS4;
 510 }
 511
 512 static void zfcp_fc_adisc_handler(void *data)
 513 {
 514         struct zfcp_fc_req *fc_req = data;
 515         struct zfcp_port *port = fc_req->ct_els.port;
 516         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 517
 518         if (fc_req->ct_els.status) {
 519                 /* request rejected or timed out */
 520                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 521                                             "fcadh_1");
 522                 goto out;
 523         }
 524
 525         if (!port->wwnn)
 526                 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 527
 528         if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 529             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 530                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 531                                      "fcadh_2");
 532                 goto out;
 533         }
 534
 535         /* re-init to undo drop from zfcp_fc_adisc() */
 536         port->d_id = ntoh24(adisc_resp->adisc_port_id);
 537         /* port is still good, nothing to do */
 538  out:
 539         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 540         put_device(&port->dev);
 541         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 542 }
 543
 544 static int zfcp_fc_adisc(struct zfcp_port *port)
 545 {
 546         struct zfcp_fc_req *fc_req;
 547         struct zfcp_adapter *adapter = port->adapter;
 548         struct Scsi_Host *shost = adapter->scsi_host;
 549         u32 d_id;
 550         int ret;
 551
 552         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 553         if (!fc_req)
 554                 return -ENOMEM;
 555
 556         fc_req->ct_els.port = port;
 557         fc_req->ct_els.req = &fc_req->sg_req;
 558         fc_req->ct_els.resp = &fc_req->sg_rsp;
 559         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 560                     sizeof(struct fc_els_adisc));
 561         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 562                     sizeof(struct fc_els_adisc));
 563
 564         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 565         fc_req->ct_els.handler_data = fc_req;
 566
 567         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 568            without FC-AL-2 capability, so we don't set it */
 569         fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
 570         fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
 571         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 572         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 573
 574         d_id = port->d_id; /* remember as destination for send els below */
 575         /*
 576          * Force fresh GID_PN lookup on next port recovery.
 577          * Must happen after request setup and before sending request,
 578          * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().
 579          */
 580         port->d_id = 0;
 581
 582         ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els,
 583                                 ZFCP_FC_CTELS_TMO);
 584         if (ret)
 585                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 586
 587         return ret;
 588 }
 589
 590 void zfcp_fc_link_test_work(struct work_struct *work)
 591 {
 592         struct zfcp_port *port =
 593                 container_of(work, struct zfcp_port, test_link_work);
 594         int retval;
 595
 596         set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 597
 598         /* only issue one test command at one time per port */
 599         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 600                 goto out;
 601
 602         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 603
 604         retval = zfcp_fc_adisc(port);
 605         if (retval == 0)
 606                 return;
 607
 608         /* send of ADISC was not possible */
 609         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 610         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 611
 612 out:
 613         put_device(&port->dev);
 614 }
 615
 616 /**
 617  * zfcp_fc_test_link - lightweight link test procedure
 618  * @port: port to be tested
 619  *
 620  * Test status of a link to a remote port using the ELS command ADISC.
 621  * If there is a problem with the remote port, error recovery steps
 622  * will be triggered.
 623  */
 624 void zfcp_fc_test_link(struct zfcp_port *port)
 625 {
 626         get_device(&port->dev);
 627         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 628                 put_device(&port->dev);
 629 }
 630
 631 /**
 632  * zfcp_fc_sg_free_table - free memory used by scatterlists
 633  * @sg: pointer to scatterlist
 634  * @count: number of scatterlist which are to be free'ed
 635  * the scatterlist are expected to reference pages always
 636  */
 637 static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
 638 {
 639         int i;
 640
 641         for (i = 0; i < count; i++, sg = sg_next(sg))
 642                 if (sg)
 643                         free_page((unsigned long) sg_virt(sg));
 644                 else
 645                         break;
 646 }
 647
 648 /**
 649  * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers
 650  * @sg: pointer to struct scatterlist
 651  * @count: number of scatterlists which should be assigned with buffers
 652  * of size page
 653  *
 654  * Returns: 0 on success, -ENOMEM otherwise
 655  */
 656 static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
 657 {
 658         void *addr;
 659         int i;
 660
 661         sg_init_table(sg, count);
 662         for (i = 0; i < count; i++, sg = sg_next(sg)) {
 663                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 664                 if (!addr) {
 665                         zfcp_fc_sg_free_table(sg, i);
 666                         return -ENOMEM;
 667                 }
 668                 sg_set_buf(sg, addr, PAGE_SIZE);
 669         }
 670         return 0;
 671 }
 672
 673 static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)
 674 {
 675         struct zfcp_fc_req *fc_req;
 676
 677         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 678         if (!fc_req)
 679                 return NULL;
 680
 681         if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 682                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 683                 return NULL;
 684         }
 685
 686         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 687                     sizeof(struct zfcp_fc_gpn_ft_req));
 688
 689         return fc_req;
 690 }
 691
 692 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 693                                struct zfcp_adapter *adapter, int max_bytes)
 694 {
 695         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 696         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 697         DECLARE_COMPLETION_ONSTACK(completion);
 698         int ret;
 699
 700         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 701         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 702
 703         ct_els->handler = zfcp_fc_complete;
 704         ct_els->handler_data = &completion;
 705         ct_els->req = &fc_req->sg_req;
 706         ct_els->resp = &fc_req->sg_rsp;
 707
 708         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 709                                ZFCP_FC_CTELS_TMO);
 710         if (!ret)
 711                 wait_for_completion(&completion);
 712         return ret;
 713 }
 714
 715 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 716 {
 717         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 718                 return;
 719
 720         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 721
 722         if ((port->supported_classes != 0) ||
 723             !list_empty(&port->unit_list))
 724                 return;
 725
 726         list_move_tail(&port->list, lh);
 727 }
 728
 729 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 730                                struct zfcp_adapter *adapter, int max_entries)
 731 {
 732         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 733         struct scatterlist *sg = &fc_req->sg_rsp;
 734         struct fc_ct_hdr *hdr = sg_virt(sg);
 735         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 736         struct zfcp_port *port, *tmp;
 737         unsigned long flags;
 738         LIST_HEAD(remove_lh);
 739         u32 d_id;
 740         int ret = 0, x, last = 0;
 741
 742         if (ct_els->status)
 743                 return -EIO;
 744
 745         if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 746                 if (hdr->ct_reason == FC_FS_RJT_UNABL)
 747                         return -EAGAIN; /* might be a temporary condition */
 748                 return -EIO;
 749         }
 750
 751         if (hdr->ct_mr_size) {
 752                 dev_warn(&adapter->ccw_device->dev,
 753                          "The name server reported %d words residual data\n",
 754                          hdr->ct_mr_size);
 755                 return -E2BIG;
 756         }
 757
 758         /* first entry is the header */
 759         for (x = 1; x < max_entries && !last; x++) {
 760                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 761                         acc++;
 762                 else
 763                         acc = sg_virt(++sg);
 764
 765                 last = acc->fp_flags & FC_NS_FID_LAST;
 766                 d_id = ntoh24(acc->fp_fid);
 767
 768                 /* don't attach ports with a well known address */
 769                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 770                         continue;
 771                 /* skip the adapter's port and known remote ports */
 772                 if (be64_to_cpu(acc->fp_wwpn) ==
 773                     fc_host_port_name(adapter->scsi_host))
 774                         continue;
 775
 776                 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 777                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 778                 if (!IS_ERR(port))
 779                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 780                 else if (PTR_ERR(port) != -EEXIST)
 781                         ret = PTR_ERR(port);
 782         }
 783
 784         zfcp_erp_wait(adapter);
 785         write_lock_irqsave(&adapter->port_list_lock, flags);
 786         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 787                 zfcp_fc_validate_port(port, &remove_lh);
 788         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 789
 790         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 791                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 792                 device_unregister(&port->dev);
 793         }
 794
 795         return ret;
 796 }
 797
 798 /**
 799  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 800  * @work: reference to scheduled work
 801  */
 802 void zfcp_fc_scan_ports(struct work_struct *work)
 803 {
 804         struct delayed_work *dw = to_delayed_work(work);
 805         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 806                                                     scan_work);
 807         int ret, i;
 808         struct zfcp_fc_req *fc_req;
 809         int chain, max_entries, buf_num, max_bytes;
 810
 811         zfcp_fc_port_scan_time(adapter);
 812
 813         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 814         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 815         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 816         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 817
 818         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 819             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 820                 return;
 821
 822         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 823                 return;
 824
 825         fc_req = zfcp_fc_alloc_sg_env(buf_num);
 826         if (!fc_req)
 827                 goto out;
 828
 829         for (i = 0; i < 3; i++) {
 830                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 831                 if (!ret) {
 832                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 833                         if (ret == -EAGAIN)
 834                                 ssleep(1);
 835                         else
 836                                 break;
 837                 }
 838         }
 839         zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);
 840         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 841 out:
 842         zfcp_fc_wka_port_put(&adapter->gs->ds);
 843 }
 844
 845 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 846                         struct zfcp_fc_req *fc_req)
 847 {
 848         DECLARE_COMPLETION_ONSTACK(completion);
 849         char devno[] = "DEVNO:";
 850         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 851         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 852         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 853         int ret;
 854
 855         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 856                            FC_SYMBOLIC_NAME_SIZE);
 857         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 858
 859         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 860         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 861
 862         ct_els->handler = zfcp_fc_complete;
 863         ct_els->handler_data = &completion;
 864         ct_els->req = &fc_req->sg_req;
 865         ct_els->resp = &fc_req->sg_rsp;
 866
 867         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 868                                ZFCP_FC_CTELS_TMO);
 869         if (ret)
 870                 return ret;
 871
 872         wait_for_completion(&completion);
 873         if (ct_els->status)
 874                 return ct_els->status;
 875
 876         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 877             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 878                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 879                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 880                          gspn_rsp->gspn.fp_name, devno,
 881                          dev_name(&adapter->ccw_device->dev),
 882                          init_utsname()->nodename);
 883         else
 884                 strscpy(fc_host_symbolic_name(adapter->scsi_host),
 885                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 886
 887         return 0;
 888 }
 889
 890 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 891                          struct zfcp_fc_req *fc_req)
 892 {
 893         DECLARE_COMPLETION_ONSTACK(completion);
 894         struct Scsi_Host *shost = adapter->scsi_host;
 895         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 896         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 897         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 898         int ret, len;
 899
 900         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 901                            FC_SYMBOLIC_NAME_SIZE);
 902         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 903         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 904                       FC_SYMBOLIC_NAME_SIZE);
 905         rspn_req->rspn.fr_name_len = len;
 906
 907         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 908         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 909
 910         ct_els->handler = zfcp_fc_complete;
 911         ct_els->handler_data = &completion;
 912         ct_els->req = &fc_req->sg_req;
 913         ct_els->resp = &fc_req->sg_rsp;
 914
 915         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 916                                ZFCP_FC_CTELS_TMO);
 917         if (!ret)
 918                 wait_for_completion(&completion);
 919 }
 920
 921 /**
 922  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 923  * @work: ns_up_work of the adapter where to update the symbolic port name
 924  *
 925  * Retrieve the current symbolic port name that may have been set by
 926  * the hardware using the GSPN request and update the fc_host
 927  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 928  * the port name is unique for this system), update the symbolic port
 929  * name to add Linux specific information and update the FC nameserver
 930  * using the RSPN request.
 931  */
 932 void zfcp_fc_sym_name_update(struct work_struct *work)
 933 {
 934         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 935                                                     ns_up_work);
 936         int ret;
 937         struct zfcp_fc_req *fc_req;
 938
 939         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 940             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 941                 return;
 942
 943         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 944         if (!fc_req)
 945                 return;
 946
 947         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 948         if (ret)
 949                 goto out_free;
 950
 951         ret = zfcp_fc_gspn(adapter, fc_req);
 952         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 953                 goto out_ds_put;
 954
 955         memset(fc_req, 0, sizeof(*fc_req));
 956         zfcp_fc_rspn(adapter, fc_req);
 957
 958 out_ds_put:
 959         zfcp_fc_wka_port_put(&adapter->gs->ds);
 960 out_free:
 961         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 962 }
 963
 964 static void zfcp_fc_ct_els_job_handler(void *data)
 965 {
 966         struct bsg_job *job = data;
 967         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 968         struct fc_bsg_reply *jr = job->reply;
 969
 970         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 971         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 972         jr->result = zfcp_ct_els->status ? -EIO : 0;
 973         bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 974 }
 975
 976 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 977 {
 978         u32 preamble_word1;
 979         u8 gs_type;
 980         struct zfcp_adapter *adapter;
 981         struct fc_bsg_request *bsg_request = job->request;
 982         struct fc_rport *rport = fc_bsg_to_rport(job);
 983         struct Scsi_Host *shost;
 984
 985         preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 986         gs_type = (preamble_word1 & 0xff000000) >> 24;
 987
 988         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 989         adapter = (struct zfcp_adapter *) shost->hostdata[0];
 990
 991         switch (gs_type) {
 992         case FC_FST_ALIAS:
 993                 return &adapter->gs->as;
 994         case FC_FST_MGMT:
 995                 return &adapter->gs->ms;
 996         case FC_FST_TIME:
 997                 return &adapter->gs->ts;
 998                 break;
 999         case FC_FST_DIR:
1000                 return &adapter->gs->ds;
1001                 break;
1002         default:
1003                 return NULL;
1004         }
1005 }
1006
1007 static void zfcp_fc_ct_job_handler(void *data)
1008 {
1009         struct bsg_job *job = data;
1010         struct zfcp_fc_wka_port *wka_port;
1011
1012         wka_port = zfcp_fc_job_wka_port(job);
1013         zfcp_fc_wka_port_put(wka_port);
1014
1015         zfcp_fc_ct_els_job_handler(data);
1016 }
1017
1018 static int zfcp_fc_exec_els_job(struct bsg_job *job,
1019                                 struct zfcp_adapter *adapter)
1020 {
1021         struct zfcp_fsf_ct_els *els = job->dd_data;
1022         struct fc_rport *rport = fc_bsg_to_rport(job);
1023         struct fc_bsg_request *bsg_request = job->request;
1024         struct zfcp_port *port;
1025         u32 d_id;
1026
1027         if (rport) {
1028                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
1029                 if (!port)
1030                         return -EINVAL;
1031
1032                 d_id = port->d_id;
1033                 put_device(&port->dev);
1034         } else
1035                 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
1036
1037         els->handler = zfcp_fc_ct_els_job_handler;
1038         return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);
1039 }
1040
1041 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
1042                                struct zfcp_adapter *adapter)
1043 {
1044         int ret;
1045         struct zfcp_fsf_ct_els *ct = job->dd_data;
1046         struct zfcp_fc_wka_port *wka_port;
1047
1048         wka_port = zfcp_fc_job_wka_port(job);
1049         if (!wka_port)
1050                 return -EINVAL;
1051
1052         ret = zfcp_fc_wka_port_get(wka_port);
1053         if (ret)
1054                 return ret;
1055
1056         ct->handler = zfcp_fc_ct_job_handler;
1057         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);
1058         if (ret)
1059                 zfcp_fc_wka_port_put(wka_port);
1060
1061         return ret;
1062 }
1063
1064 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1065 {
1066         struct Scsi_Host *shost;
1067         struct zfcp_adapter *adapter;
1068         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1069         struct fc_bsg_request *bsg_request = job->request;
1070         struct fc_rport *rport = fc_bsg_to_rport(job);
1071
1072         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
1073         adapter = (struct zfcp_adapter *)shost->hostdata[0];
1074
1075         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1076                 return -EINVAL;
1077
1078         ct_els->req = job->request_payload.sg_list;
1079         ct_els->resp = job->reply_payload.sg_list;
1080         ct_els->handler_data = job;
1081
1082         switch (bsg_request->msgcode) {
1083         case FC_BSG_RPT_ELS:
1084         case FC_BSG_HST_ELS_NOLOGIN:
1085                 return zfcp_fc_exec_els_job(job, adapter);
1086         case FC_BSG_RPT_CT:
1087         case FC_BSG_HST_CT:
1088                 return zfcp_fc_exec_ct_job(job, adapter);
1089         default:
1090                 return -EINVAL;
1091         }
1092 }
1093
1094 int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1095 {
1096         /* hardware tracks timeout, reset bsg timeout to not interfere */
1097         return -EAGAIN;
1098 }
1099
1100 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1101 {
1102         struct zfcp_fc_wka_ports *wka_ports;
1103
1104         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1105         if (!wka_ports)
1106                 return -ENOMEM;
1107
1108         adapter->gs = wka_ports;
1109         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1110         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1111         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1112         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1113
1114         return 0;
1115 }
1116
1117 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1118 {
1119         kfree(adapter->gs);
1120         adapter->gs = NULL;
1121 }
1122