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