SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_fc.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Fibre Channel related functions for the zfcp device driver.
   5  *
   6  * Copyright IBM Corporation 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 struct ct_iu_gpn_ft_req {
  12         struct ct_hdr header;
  13         u8 flags;
  14         u8 domain_id_scope;
  15         u8 area_id_scope;
  16         u8 fc4_type;
  17 } __attribute__ ((packed));
  18
  19 struct gpn_ft_resp_acc {
  20         u8 control;
  21         u8 port_id[3];
  22         u8 reserved[4];
  23         u64 wwpn;
  24 } __attribute__ ((packed));
  25
  26 #define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
  27                                 / sizeof(struct gpn_ft_resp_acc))
  28 #define ZFCP_GPN_FT_BUFFERS 4
  29 #define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
  30
  31 struct ct_iu_gpn_ft_resp {
  32         struct ct_hdr header;
  33         struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
  34 } __attribute__ ((packed));
  35
  36 struct zfcp_gpn_ft {
  37         struct zfcp_send_ct ct;
  38         struct scatterlist sg_req;
  39         struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
  40 };
  41
  42 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
  43                                    struct fcp_rscn_element *elem)
  44 {
  45         unsigned long flags;
  46         struct zfcp_port *port;
  47
  48         read_lock_irqsave(&zfcp_data.config_lock, flags);
  49         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
  50                 if ((atomic_read(&port->status) & ZFCP_STATUS_PORT_WKA) ==
  51                       ZFCP_STATUS_PORT_WKA)
  52                         continue;
  53                 /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
  54                 if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_DID_DID))
  55                         /* Try to connect to unused ports anyway. */
  56                         zfcp_erp_port_reopen(port,
  57                                              ZFCP_STATUS_COMMON_ERP_FAILED,
  58                                              82, fsf_req);
  59                 else if ((port->d_id & range) == (elem->nport_did & range))
  60                         /* Check connection status for connected ports */
  61                         zfcp_test_link(port);
  62         }
  63         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
  64 }
  65
  66 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
  67 {
  68         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
  69         struct fcp_rscn_head *fcp_rscn_head;
  70         struct fcp_rscn_element *fcp_rscn_element;
  71         u16 i;
  72         u16 no_entries;
  73         u32 range_mask;
  74
  75         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
  76         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
  77
  78         /* see FC-FS */
  79         no_entries = fcp_rscn_head->payload_len /
  80                         sizeof(struct fcp_rscn_element);
  81
  82         for (i = 1; i < no_entries; i++) {
  83                 /* skip head and start with 1st element */
  84                 fcp_rscn_element++;
  85                 switch (fcp_rscn_element->addr_format) {
  86                 case ZFCP_PORT_ADDRESS:
  87                         range_mask = ZFCP_PORTS_RANGE_PORT;
  88                         break;
  89                 case ZFCP_AREA_ADDRESS:
  90                         range_mask = ZFCP_PORTS_RANGE_AREA;
  91                         break;
  92                 case ZFCP_DOMAIN_ADDRESS:
  93                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
  94                         break;
  95                 case ZFCP_FABRIC_ADDRESS:
  96                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
  97                         break;
  98                 default:
  99                         continue;
 100                 }
 101                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 102         }
 103         schedule_work(&fsf_req->adapter->scan_work);
 104 }
 105
 106 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
 107 {
 108         struct zfcp_adapter *adapter = req->adapter;
 109         struct zfcp_port *port;
 110         unsigned long flags;
 111
 112         read_lock_irqsave(&zfcp_data.config_lock, flags);
 113         list_for_each_entry(port, &adapter->port_list_head, list)
 114                 if (port->wwpn == wwpn)
 115                         break;
 116         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 117
 118         if (port && (port->wwpn == wwpn))
 119                 zfcp_erp_port_forced_reopen(port, 0, 83, req);
 120 }
 121
 122 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 123 {
 124         struct fsf_status_read_buffer *status_buffer =
 125                 (struct fsf_status_read_buffer *)req->data;
 126         struct fsf_plogi *els_plogi =
 127                 (struct fsf_plogi *) status_buffer->payload.data;
 128
 129         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 130 }
 131
 132 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 133 {
 134         struct fsf_status_read_buffer *status_buffer =
 135                 (struct fsf_status_read_buffer *)req->data;
 136         struct fcp_logo *els_logo =
 137                 (struct fcp_logo *) status_buffer->payload.data;
 138
 139         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 140 }
 141
 142 /**
 143  * zfcp_fc_incoming_els - handle incoming ELS
 144  * @fsf_req - request which contains incoming ELS
 145  */
 146 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 147 {
 148         struct fsf_status_read_buffer *status_buffer =
 149                 (struct fsf_status_read_buffer *) fsf_req->data;
 150         unsigned int els_type = status_buffer->payload.data[0];
 151
 152         zfcp_san_dbf_event_incoming_els(fsf_req);
 153         if (els_type == LS_PLOGI)
 154                 zfcp_fc_incoming_plogi(fsf_req);
 155         else if (els_type == LS_LOGO)
 156                 zfcp_fc_incoming_logo(fsf_req);
 157         else if (els_type == LS_RSCN)
 158                 zfcp_fc_incoming_rscn(fsf_req);
 159 }
 160
 161 static void zfcp_ns_gid_pn_handler(unsigned long data)
 162 {
 163         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 164         struct zfcp_send_ct *ct = &gid_pn->ct;
 165         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 166         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 167         struct zfcp_port *port = gid_pn->port;
 168
 169         if (ct->status)
 170                 goto out;
 171         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
 172                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
 173                 goto out;
 174         }
 175         /* paranoia */
 176         if (ct_iu_req->wwpn != port->wwpn)
 177                 goto out;
 178         /* looks like a valid d_id */
 179         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 180         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
 181 out:
 182         mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
 183 }
 184
 185 /**
 186  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 187  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 188  * return: -ENOMEM on error, 0 otherwise
 189  */
 190 int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
 191 {
 192         int ret;
 193         struct zfcp_gid_pn_data *gid_pn;
 194         struct zfcp_adapter *adapter = erp_action->adapter;
 195
 196         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 197         if (!gid_pn)
 198                 return -ENOMEM;
 199
 200         memset(gid_pn, 0, sizeof(*gid_pn));
 201
 202         /* setup parameters for send generic command */
 203         gid_pn->port = erp_action->port;
 204         gid_pn->ct.port = adapter->nameserver_port;
 205         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
 206         gid_pn->ct.handler_data = (unsigned long) gid_pn;
 207         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 208         gid_pn->ct.req = &gid_pn->req;
 209         gid_pn->ct.resp = &gid_pn->resp;
 210         gid_pn->ct.req_count = 1;
 211         gid_pn->ct.resp_count = 1;
 212         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 213                     sizeof(struct ct_iu_gid_pn_req));
 214         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 215                     sizeof(struct ct_iu_gid_pn_resp));
 216
 217         /* setup nameserver request */
 218         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 219         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 220         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 221         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 222         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 223         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
 224         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 225
 226         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 227                                erp_action);
 228         if (ret)
 229                 mempool_free(gid_pn, adapter->pool.data_gid_pn);
 230         return ret;
 231 }
 232
 233 /**
 234  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 235  * @port: zfcp_port structure
 236  * @plogi: plogi payload
 237  *
 238  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 239  */
 240 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 241 {
 242         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 243                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 244         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 245                 port->supported_classes |= FC_COS_CLASS1;
 246         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 247                 port->supported_classes |= FC_COS_CLASS2;
 248         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 249                 port->supported_classes |= FC_COS_CLASS3;
 250         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 251                 port->supported_classes |= FC_COS_CLASS4;
 252 }
 253
 254 struct zfcp_els_adisc {
 255         struct zfcp_send_els els;
 256         struct scatterlist req;
 257         struct scatterlist resp;
 258         struct zfcp_ls_adisc ls_adisc;
 259         struct zfcp_ls_adisc ls_adisc_acc;
 260 };
 261
 262 static void zfcp_fc_adisc_handler(unsigned long data)
 263 {
 264         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 265         struct zfcp_port *port = adisc->els.port;
 266         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 267
 268         if (adisc->els.status) {
 269                 /* request rejected or timed out */
 270                 zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
 271                 goto out;
 272         }
 273
 274         if (!port->wwnn)
 275                 port->wwnn = ls_adisc->wwnn;
 276
 277         if (port->wwpn != ls_adisc->wwpn)
 278                 zfcp_erp_port_reopen(port, 0, 64, NULL);
 279
 280  out:
 281         zfcp_port_put(port);
 282         kfree(adisc);
 283 }
 284
 285 static int zfcp_fc_adisc(struct zfcp_port *port)
 286 {
 287         struct zfcp_els_adisc *adisc;
 288         struct zfcp_adapter *adapter = port->adapter;
 289
 290         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 291         if (!adisc)
 292                 return -ENOMEM;
 293
 294         adisc->els.req = &adisc->req;
 295         adisc->els.resp = &adisc->resp;
 296         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 297                     sizeof(struct zfcp_ls_adisc));
 298         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 299                     sizeof(struct zfcp_ls_adisc));
 300
 301         adisc->els.req_count = 1;
 302         adisc->els.resp_count = 1;
 303         adisc->els.adapter = adapter;
 304         adisc->els.port = port;
 305         adisc->els.d_id = port->d_id;
 306         adisc->els.handler = zfcp_fc_adisc_handler;
 307         adisc->els.handler_data = (unsigned long) adisc;
 308         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 309
 310         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 311            without FC-AL-2 capability, so we don't set it */
 312         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 313         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 314         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 315
 316         return zfcp_fsf_send_els(&adisc->els);
 317 }
 318
 319 /**
 320  * zfcp_test_link - lightweight link test procedure
 321  * @port: port to be tested
 322  *
 323  * Test status of a link to a remote port using the ELS command ADISC.
 324  * If there is a problem with the remote port, error recovery steps
 325  * will be triggered.
 326  */
 327 void zfcp_test_link(struct zfcp_port *port)
 328 {
 329         int retval;
 330
 331         zfcp_port_get(port);
 332         retval = zfcp_fc_adisc(port);
 333         if (retval == 0)
 334                 return;
 335
 336         /* send of ADISC was not possible */
 337         zfcp_port_put(port);
 338         if (retval != -EBUSY)
 339                 zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 340 }
 341
 342 static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
 343 {
 344         int ret;
 345
 346         if (!adapter->nameserver_port)
 347                 return -EINTR;
 348
 349         if (!(atomic_read(&adapter->nameserver_port->status) &
 350               ZFCP_STATUS_COMMON_UNBLOCKED)) {
 351                 ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
 352                                            NULL);
 353                 if (ret)
 354                         return ret;
 355                 zfcp_erp_wait(adapter);
 356         }
 357         return !(atomic_read(&adapter->nameserver_port->status) &
 358                  ZFCP_STATUS_COMMON_UNBLOCKED);
 359 }
 360
 361 static void zfcp_gpn_ft_handler(unsigned long _done)
 362 {
 363         complete((struct completion *)_done);
 364 }
 365
 366 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
 367 {
 368         struct scatterlist *sg = &gpn_ft->sg_req;
 369
 370         kfree(sg_virt(sg)); /* free request buffer */
 371         zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
 372
 373         kfree(gpn_ft);
 374 }
 375
 376 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
 377 {
 378         struct zfcp_gpn_ft *gpn_ft;
 379         struct ct_iu_gpn_ft_req *req;
 380
 381         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 382         if (!gpn_ft)
 383                 return NULL;
 384
 385         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 386         if (!req) {
 387                 kfree(gpn_ft);
 388                 gpn_ft = NULL;
 389                 goto out;
 390         }
 391         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 392
 393         if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
 394                 zfcp_free_sg_env(gpn_ft);
 395                 gpn_ft = NULL;
 396         }
 397 out:
 398         return gpn_ft;
 399 }
 400
 401
 402 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 403                                   struct zfcp_adapter *adapter)
 404 {
 405         struct zfcp_send_ct *ct = &gpn_ft->ct;
 406         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 407         struct completion done;
 408         int ret;
 409
 410         /* prepare CT IU for GPN_FT */
 411         req->header.revision = ZFCP_CT_REVISION;
 412         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 413         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 414         req->header.options = ZFCP_CT_SYNCHRONOUS;
 415         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 416         req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
 417                                         (ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
 418         req->flags = 0;
 419         req->domain_id_scope = 0;
 420         req->area_id_scope = 0;
 421         req->fc4_type = ZFCP_CT_SCSI_FCP;
 422
 423         /* prepare zfcp_send_ct */
 424         ct->port = adapter->nameserver_port;
 425         ct->handler = zfcp_gpn_ft_handler;
 426         ct->handler_data = (unsigned long)&done;
 427         ct->timeout = 10;
 428         ct->req = &gpn_ft->sg_req;
 429         ct->resp = gpn_ft->sg_resp;
 430         ct->req_count = 1;
 431         ct->resp_count = ZFCP_GPN_FT_BUFFERS;
 432
 433         init_completion(&done);
 434         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 435         if (!ret)
 436                 wait_for_completion(&done);
 437         return ret;
 438 }
 439
 440 static void zfcp_validate_port(struct zfcp_port *port)
 441 {
 442         struct zfcp_adapter *adapter = port->adapter;
 443
 444         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 445
 446         if (port == adapter->nameserver_port)
 447                 return;
 448         if ((port->supported_classes != 0) || (port->units != 0)) {
 449                 zfcp_port_put(port);
 450                 return;
 451         }
 452         zfcp_erp_port_shutdown(port, 0, 151, NULL);
 453         zfcp_erp_wait(adapter);
 454         zfcp_port_put(port);
 455         zfcp_port_dequeue(port);
 456 }
 457
 458 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
 459 {
 460         struct zfcp_send_ct *ct = &gpn_ft->ct;
 461         struct scatterlist *sg = gpn_ft->sg_resp;
 462         struct ct_hdr *hdr = sg_virt(sg);
 463         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 464         struct zfcp_adapter *adapter = ct->port->adapter;
 465         struct zfcp_port *port, *tmp;
 466         u32 d_id;
 467         int ret = 0, x, last = 0;
 468
 469         if (ct->status)
 470                 return -EIO;
 471
 472         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 473                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 474                         return -EAGAIN; /* might be a temporary condition */
 475                 return -EIO;
 476         }
 477
 478         if (hdr->max_res_size)
 479                 return -E2BIG;
 480
 481         down(&zfcp_data.config_sema);
 482
 483         /* first entry is the header */
 484         for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) {
 485                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 486                         acc++;
 487                 else
 488                         acc = sg_virt(++sg);
 489
 490                 last = acc->control & 0x80;
 491                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 492                        acc->port_id[2];
 493
 494                 /* skip the adapter's port and known remote ports */
 495                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 496                         continue;
 497                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 498                 if (port) {
 499                         zfcp_port_get(port);
 500                         continue;
 501                 }
 502
 503                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 504                                          ZFCP_STATUS_PORT_DID_DID |
 505                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 506                 if (IS_ERR(port))
 507                         ret = PTR_ERR(port);
 508                 else
 509                         zfcp_erp_port_reopen(port, 0, 149, NULL);
 510         }
 511
 512         zfcp_erp_wait(adapter);
 513         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 514                 zfcp_validate_port(port);
 515         up(&zfcp_data.config_sema);
 516         return ret;
 517 }
 518
 519 /**
 520  * zfcp_scan_ports - scan remote ports and attach new ports
 521  * @adapter: pointer to struct zfcp_adapter
 522  */
 523 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 524 {
 525         int ret, i;
 526         struct zfcp_gpn_ft *gpn_ft;
 527
 528         zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
 529         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
 530                 return 0;
 531
 532         ret = zfcp_scan_get_nameserver(adapter);
 533         if (ret)
 534                 return ret;
 535
 536         gpn_ft = zfcp_alloc_sg_env();
 537         if (!gpn_ft)
 538                 return -ENOMEM;
 539
 540         for (i = 0; i < 3; i++) {
 541                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
 542                 if (!ret) {
 543                         ret = zfcp_scan_eval_gpn_ft(gpn_ft);
 544                         if (ret == -EAGAIN)
 545                                 ssleep(1);
 546                         else
 547                                 break;
 548                 }
 549         }
 550         zfcp_free_sg_env(gpn_ft);
 551
 552         return ret;
 553 }
 554
 555
 556 void _zfcp_scan_ports_later(struct work_struct *work)
 557 {
 558         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 559 }