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 struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *adapter,
  43                                               u32 d_id)
  44 {
  45         struct zfcp_port *port;
  46
  47         list_for_each_entry(port, &adapter->port_list_head, list)
  48                 if ((port->d_id == d_id) &&
  49                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
  50                         return port;
  51         return NULL;
  52 }
  53
  54 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
  55                                    struct fcp_rscn_element *elem)
  56 {
  57         unsigned long flags;
  58         struct zfcp_port *port;
  59
  60         read_lock_irqsave(&zfcp_data.config_lock, flags);
  61         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
  62                 if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
  63                         continue;
  64                 /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
  65                 if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
  66                         /* Try to connect to unused ports anyway. */
  67                         zfcp_erp_port_reopen(port,
  68                                              ZFCP_STATUS_COMMON_ERP_FAILED,
  69                                              82, fsf_req);
  70                 else if ((port->d_id & range) == (elem->nport_did & range))
  71                         /* Check connection status for connected ports */
  72                         zfcp_test_link(port);
  73         }
  74         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
  75 }
  76
  77 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
  78 {
  79         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
  80         struct fcp_rscn_head *fcp_rscn_head;
  81         struct fcp_rscn_element *fcp_rscn_element;
  82         u16 i;
  83         u16 no_entries;
  84         u32 range_mask;
  85
  86         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
  87         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
  88
  89         /* see FC-FS */
  90         no_entries = fcp_rscn_head->payload_len /
  91                         sizeof(struct fcp_rscn_element);
  92
  93         for (i = 1; i < no_entries; i++) {
  94                 /* skip head and start with 1st element */
  95                 fcp_rscn_element++;
  96                 switch (fcp_rscn_element->addr_format) {
  97                 case ZFCP_PORT_ADDRESS:
  98                         range_mask = ZFCP_PORTS_RANGE_PORT;
  99                         break;
 100                 case ZFCP_AREA_ADDRESS:
 101                         range_mask = ZFCP_PORTS_RANGE_AREA;
 102                         break;
 103                 case ZFCP_DOMAIN_ADDRESS:
 104                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
 105                         break;
 106                 case ZFCP_FABRIC_ADDRESS:
 107                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
 108                         break;
 109                 default:
 110                         continue;
 111                 }
 112                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 113         }
 114         schedule_work(&fsf_req->adapter->scan_work);
 115 }
 116
 117 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
 118 {
 119         struct zfcp_adapter *adapter = req->adapter;
 120         struct zfcp_port *port;
 121         unsigned long flags;
 122
 123         read_lock_irqsave(&zfcp_data.config_lock, flags);
 124         list_for_each_entry(port, &adapter->port_list_head, list)
 125                 if (port->wwpn == wwpn)
 126                         break;
 127         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 128
 129         if (port && (port->wwpn == wwpn))
 130                 zfcp_erp_port_forced_reopen(port, 0, 83, req);
 131 }
 132
 133 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 134 {
 135         struct fsf_status_read_buffer *status_buffer =
 136                 (struct fsf_status_read_buffer *)req->data;
 137         struct fsf_plogi *els_plogi =
 138                 (struct fsf_plogi *) status_buffer->payload.data;
 139
 140         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 141 }
 142
 143 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 144 {
 145         struct fsf_status_read_buffer *status_buffer =
 146                 (struct fsf_status_read_buffer *)req->data;
 147         struct fcp_logo *els_logo =
 148                 (struct fcp_logo *) status_buffer->payload.data;
 149
 150         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 151 }
 152
 153 /**
 154  * zfcp_fc_incoming_els - handle incoming ELS
 155  * @fsf_req - request which contains incoming ELS
 156  */
 157 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 158 {
 159         struct fsf_status_read_buffer *status_buffer =
 160                 (struct fsf_status_read_buffer *) fsf_req->data;
 161         unsigned int els_type = status_buffer->payload.data[0];
 162
 163         zfcp_san_dbf_event_incoming_els(fsf_req);
 164         if (els_type == LS_PLOGI)
 165                 zfcp_fc_incoming_plogi(fsf_req);
 166         else if (els_type == LS_LOGO)
 167                 zfcp_fc_incoming_logo(fsf_req);
 168         else if (els_type == LS_RSCN)
 169                 zfcp_fc_incoming_rscn(fsf_req);
 170 }
 171
 172 static void zfcp_ns_gid_pn_handler(unsigned long data)
 173 {
 174         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 175         struct zfcp_send_ct *ct = &gid_pn->ct;
 176         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 177         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 178         struct zfcp_port *port = gid_pn->port;
 179
 180         if (ct->status)
 181                 goto out;
 182         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
 183                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
 184                 goto out;
 185         }
 186         /* paranoia */
 187         if (ct_iu_req->wwpn != port->wwpn)
 188                 goto out;
 189         /* looks like a valid d_id */
 190         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 191         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
 192 out:
 193         mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
 194 }
 195
 196 /**
 197  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 198  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 199  * return: -ENOMEM on error, 0 otherwise
 200  */
 201 int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
 202 {
 203         int ret;
 204         struct zfcp_gid_pn_data *gid_pn;
 205         struct zfcp_adapter *adapter = erp_action->adapter;
 206
 207         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 208         if (!gid_pn)
 209                 return -ENOMEM;
 210
 211         memset(gid_pn, 0, sizeof(*gid_pn));
 212
 213         /* setup parameters for send generic command */
 214         gid_pn->port = erp_action->port;
 215         gid_pn->ct.port = adapter->nameserver_port;
 216         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
 217         gid_pn->ct.handler_data = (unsigned long) gid_pn;
 218         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 219         gid_pn->ct.req = &gid_pn->req;
 220         gid_pn->ct.resp = &gid_pn->resp;
 221         gid_pn->ct.req_count = 1;
 222         gid_pn->ct.resp_count = 1;
 223         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 224                     sizeof(struct ct_iu_gid_pn_req));
 225         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 226                     sizeof(struct ct_iu_gid_pn_resp));
 227
 228         /* setup nameserver request */
 229         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 230         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 231         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 232         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 233         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 234         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
 235         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 236
 237         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 238                                erp_action);
 239         if (ret)
 240                 mempool_free(gid_pn, adapter->pool.data_gid_pn);
 241         return ret;
 242 }
 243
 244 /**
 245  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 246  * @port: zfcp_port structure
 247  * @plogi: plogi payload
 248  *
 249  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 250  */
 251 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 252 {
 253         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 254                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 255         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 256                 port->supported_classes |= FC_COS_CLASS1;
 257         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 258                 port->supported_classes |= FC_COS_CLASS2;
 259         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 260                 port->supported_classes |= FC_COS_CLASS3;
 261         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 262                 port->supported_classes |= FC_COS_CLASS4;
 263 }
 264
 265 struct zfcp_els_adisc {
 266         struct zfcp_send_els els;
 267         struct scatterlist req;
 268         struct scatterlist resp;
 269         struct zfcp_ls_adisc ls_adisc;
 270         struct zfcp_ls_adisc_acc ls_adisc_acc;
 271 };
 272
 273 static void zfcp_fc_adisc_handler(unsigned long data)
 274 {
 275         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 276         struct zfcp_port *port = adisc->els.port;
 277         struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
 278
 279         if (adisc->els.status) {
 280                 /* request rejected or timed out */
 281                 zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
 282                 goto out;
 283         }
 284
 285         if (!port->wwnn)
 286                 port->wwnn = ls_adisc->wwnn;
 287
 288         if (port->wwpn != ls_adisc->wwpn)
 289                 zfcp_erp_port_reopen(port, 0, 64, NULL);
 290
 291  out:
 292         zfcp_port_put(port);
 293         kfree(adisc);
 294 }
 295
 296 static int zfcp_fc_adisc(struct zfcp_port *port)
 297 {
 298         struct zfcp_els_adisc *adisc;
 299         struct zfcp_adapter *adapter = port->adapter;
 300
 301         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 302         if (!adisc)
 303                 return -ENOMEM;
 304
 305         adisc->els.req = &adisc->req;
 306         adisc->els.resp = &adisc->resp;
 307         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 308                     sizeof(struct zfcp_ls_adisc));
 309         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 310                     sizeof(struct zfcp_ls_adisc_acc));
 311
 312         adisc->els.req_count = 1;
 313         adisc->els.resp_count = 1;
 314         adisc->els.adapter = adapter;
 315         adisc->els.port = port;
 316         adisc->els.d_id = port->d_id;
 317         adisc->els.handler = zfcp_fc_adisc_handler;
 318         adisc->els.handler_data = (unsigned long) adisc;
 319         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 320
 321         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 322            without FC-AL-2 capability, so we don't set it */
 323         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 324         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 325         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 326
 327         return zfcp_fsf_send_els(&adisc->els);
 328 }
 329
 330 /**
 331  * zfcp_test_link - lightweight link test procedure
 332  * @port: port to be tested
 333  *
 334  * Test status of a link to a remote port using the ELS command ADISC.
 335  * If there is a problem with the remote port, error recovery steps
 336  * will be triggered.
 337  */
 338 void zfcp_test_link(struct zfcp_port *port)
 339 {
 340         int retval;
 341
 342         zfcp_port_get(port);
 343         retval = zfcp_fc_adisc(port);
 344         if (retval == 0 || retval == -EBUSY)
 345                 return;
 346
 347         /* send of ADISC was not possible */
 348         zfcp_port_put(port);
 349         zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 350 }
 351
 352 static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
 353 {
 354         int ret;
 355
 356         if (!adapter->nameserver_port)
 357                 return -EINTR;
 358
 359         if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
 360                                &adapter->nameserver_port->status)) {
 361                 ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
 362                                            NULL);
 363                 if (ret)
 364                         return ret;
 365                 zfcp_erp_wait(adapter);
 366                 zfcp_port_put(adapter->nameserver_port);
 367         }
 368         return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
 369                                   &adapter->nameserver_port->status);
 370 }
 371
 372 static void zfcp_gpn_ft_handler(unsigned long _done)
 373 {
 374         complete((struct completion *)_done);
 375 }
 376
 377 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
 378 {
 379         struct scatterlist *sg = &gpn_ft->sg_req;
 380
 381         kfree(sg_virt(sg)); /* free request buffer */
 382         zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
 383
 384         kfree(gpn_ft);
 385 }
 386
 387 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
 388 {
 389         struct zfcp_gpn_ft *gpn_ft;
 390         struct ct_iu_gpn_ft_req *req;
 391
 392         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 393         if (!gpn_ft)
 394                 return NULL;
 395
 396         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 397         if (!req) {
 398                 kfree(gpn_ft);
 399                 gpn_ft = NULL;
 400                 goto out;
 401         }
 402         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 403
 404         if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
 405                 zfcp_free_sg_env(gpn_ft);
 406                 gpn_ft = NULL;
 407         }
 408 out:
 409         return gpn_ft;
 410 }
 411
 412
 413 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 414                                   struct zfcp_adapter *adapter)
 415 {
 416         struct zfcp_send_ct *ct = &gpn_ft->ct;
 417         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 418         struct completion done;
 419         int ret;
 420
 421         /* prepare CT IU for GPN_FT */
 422         req->header.revision = ZFCP_CT_REVISION;
 423         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 424         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 425         req->header.options = ZFCP_CT_SYNCHRONOUS;
 426         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 427         req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
 428                                         (ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
 429         req->flags = 0;
 430         req->domain_id_scope = 0;
 431         req->area_id_scope = 0;
 432         req->fc4_type = ZFCP_CT_SCSI_FCP;
 433
 434         /* prepare zfcp_send_ct */
 435         ct->port = adapter->nameserver_port;
 436         ct->handler = zfcp_gpn_ft_handler;
 437         ct->handler_data = (unsigned long)&done;
 438         ct->timeout = 10;
 439         ct->req = &gpn_ft->sg_req;
 440         ct->resp = gpn_ft->sg_resp;
 441         ct->req_count = 1;
 442         ct->resp_count = ZFCP_GPN_FT_BUFFERS;
 443
 444         init_completion(&done);
 445         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 446         if (!ret)
 447                 wait_for_completion(&done);
 448         return ret;
 449 }
 450
 451 static void zfcp_validate_port(struct zfcp_port *port)
 452 {
 453         struct zfcp_adapter *adapter = port->adapter;
 454
 455         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 456
 457         if (port == adapter->nameserver_port)
 458                 return;
 459         if ((port->supported_classes != 0) || (port->units != 0)) {
 460                 zfcp_port_put(port);
 461                 return;
 462         }
 463         zfcp_erp_port_shutdown(port, 0, 151, NULL);
 464         zfcp_erp_wait(adapter);
 465         zfcp_port_put(port);
 466         zfcp_port_dequeue(port);
 467 }
 468
 469 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
 470 {
 471         struct zfcp_send_ct *ct = &gpn_ft->ct;
 472         struct scatterlist *sg = gpn_ft->sg_resp;
 473         struct ct_hdr *hdr = sg_virt(sg);
 474         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 475         struct zfcp_adapter *adapter = ct->port->adapter;
 476         struct zfcp_port *port, *tmp;
 477         u32 d_id;
 478         int ret = 0, x;
 479
 480         if (ct->status)
 481                 return -EIO;
 482
 483         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 484                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 485                         return -EAGAIN; /* might be a temporary condition */
 486                 return -EIO;
 487         }
 488
 489         if (hdr->max_res_size)
 490                 return -E2BIG;
 491
 492         down(&zfcp_data.config_sema);
 493
 494         /* first entry is the header */
 495         for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) {
 496                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 497                         acc++;
 498                 else
 499                         acc = sg_virt(++sg);
 500
 501                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 502                        acc->port_id[2];
 503
 504                 /* skip the adapter's port and known remote ports */
 505                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host) ||
 506                      zfcp_get_port_by_did(adapter, d_id))
 507                         continue;
 508
 509                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 510                                          ZFCP_STATUS_PORT_DID_DID |
 511                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 512                 if (IS_ERR(port))
 513                         ret = PTR_ERR(port);
 514                 else
 515                         zfcp_erp_port_reopen(port, 0, 149, NULL);
 516                 if (acc->control & 0x80) /* last entry */
 517                         break;
 518         }
 519
 520         zfcp_erp_wait(adapter);
 521         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 522                 zfcp_validate_port(port);
 523         up(&zfcp_data.config_sema);
 524         return ret;
 525 }
 526
 527 /**
 528  * zfcp_scan_ports - scan remote ports and attach new ports
 529  * @adapter: pointer to struct zfcp_adapter
 530  */
 531 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 532 {
 533         int ret, i;
 534         struct zfcp_gpn_ft *gpn_ft;
 535
 536         zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
 537         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
 538                 return 0;
 539
 540         ret = zfcp_scan_get_nameserver(adapter);
 541         if (ret)
 542                 return ret;
 543
 544         gpn_ft = zfcp_alloc_sg_env();
 545         if (!gpn_ft)
 546                 return -ENOMEM;
 547
 548         for (i = 0; i < 3; i++) {
 549                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
 550                 if (!ret) {
 551                         ret = zfcp_scan_eval_gpn_ft(gpn_ft);
 552                         if (ret == -EAGAIN)
 553                                 ssleep(1);
 554                         else
 555                                 break;
 556                 }
 557         }
 558         zfcp_free_sg_env(gpn_ft);
 559
 560         return ret;
 561 }
 562
 563
 564 void _zfcp_scan_ports_later(struct work_struct *work)
 565 {
 566         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 567 }