zfcp_fc.c revision bce02614cd1b3d669af1195695e503e818b60fae
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 11struct 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 19struct 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 31struct 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 36struct 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 42struct zfcp_fc_ns_handler_data { 43 struct completion done; 44 void (*handler)(unsigned long); 45 unsigned long handler_data; 46}; 47 48static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port) 49{ 50 if (mutex_lock_interruptible(&wka_port->mutex)) 51 return -ERESTARTSYS; 52 53 if (wka_port->status != ZFCP_WKA_PORT_ONLINE) { 54 wka_port->status = ZFCP_WKA_PORT_OPENING; 55 if (zfcp_fsf_open_wka_port(wka_port)) 56 wka_port->status = ZFCP_WKA_PORT_OFFLINE; 57 } 58 59 mutex_unlock(&wka_port->mutex); 60 61 wait_event_timeout( 62 wka_port->completion_wq, 63 wka_port->status == ZFCP_WKA_PORT_ONLINE || 64 wka_port->status == ZFCP_WKA_PORT_OFFLINE, 65 HZ >> 1); 66 67 if (wka_port->status == ZFCP_WKA_PORT_ONLINE) { 68 atomic_inc(&wka_port->refcount); 69 return 0; 70 } 71 return -EIO; 72} 73 74static void zfcp_wka_port_offline(struct work_struct *work) 75{ 76 struct delayed_work *dw = container_of(work, struct delayed_work, work); 77 struct zfcp_wka_port *wka_port = 78 container_of(dw, struct zfcp_wka_port, work); 79 80 wait_event(wka_port->completion_wq, 81 atomic_read(&wka_port->refcount) == 0); 82 83 mutex_lock(&wka_port->mutex); 84 if ((atomic_read(&wka_port->refcount) != 0) || 85 (wka_port->status != ZFCP_WKA_PORT_ONLINE)) 86 goto out; 87 88 wka_port->status = ZFCP_WKA_PORT_CLOSING; 89 if (zfcp_fsf_close_wka_port(wka_port)) { 90 wka_port->status = ZFCP_WKA_PORT_OFFLINE; 91 wake_up(&wka_port->completion_wq); 92 } 93out: 94 mutex_unlock(&wka_port->mutex); 95} 96 97static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port) 98{ 99 if (atomic_dec_return(&wka_port->refcount) != 0) 100 return; 101 /* wait 10 miliseconds, other reqs might pop in */ 102 schedule_delayed_work(&wka_port->work, HZ / 100); 103} 104 105void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter) 106{ 107 struct zfcp_wka_port *wka_port = &adapter->nsp; 108 109 init_waitqueue_head(&wka_port->completion_wq); 110 111 wka_port->adapter = adapter; 112 wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE; 113 114 wka_port->status = ZFCP_WKA_PORT_OFFLINE; 115 atomic_set(&wka_port->refcount, 0); 116 mutex_init(&wka_port->mutex); 117 INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline); 118} 119 120static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 121 struct fcp_rscn_element *elem) 122{ 123 unsigned long flags; 124 struct zfcp_port *port; 125 126 read_lock_irqsave(&zfcp_data.config_lock, flags); 127 list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) { 128 if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN)) 129 /* Try to connect to unused ports anyway. */ 130 zfcp_erp_port_reopen(port, 131 ZFCP_STATUS_COMMON_ERP_FAILED, 132 82, fsf_req); 133 else if ((port->d_id & range) == (elem->nport_did & range)) 134 /* Check connection status for connected ports */ 135 zfcp_test_link(port); 136 } 137 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 138} 139 140static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 141{ 142 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 143 struct fcp_rscn_head *fcp_rscn_head; 144 struct fcp_rscn_element *fcp_rscn_element; 145 u16 i; 146 u16 no_entries; 147 u32 range_mask; 148 149 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data; 150 fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head; 151 152 /* see FC-FS */ 153 no_entries = fcp_rscn_head->payload_len / 154 sizeof(struct fcp_rscn_element); 155 156 for (i = 1; i < no_entries; i++) { 157 /* skip head and start with 1st element */ 158 fcp_rscn_element++; 159 switch (fcp_rscn_element->addr_format) { 160 case ZFCP_PORT_ADDRESS: 161 range_mask = ZFCP_PORTS_RANGE_PORT; 162 break; 163 case ZFCP_AREA_ADDRESS: 164 range_mask = ZFCP_PORTS_RANGE_AREA; 165 break; 166 case ZFCP_DOMAIN_ADDRESS: 167 range_mask = ZFCP_PORTS_RANGE_DOMAIN; 168 break; 169 case ZFCP_FABRIC_ADDRESS: 170 range_mask = ZFCP_PORTS_RANGE_FABRIC; 171 break; 172 default: 173 continue; 174 } 175 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element); 176 } 177 schedule_work(&fsf_req->adapter->scan_work); 178} 179 180static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 181{ 182 struct zfcp_adapter *adapter = req->adapter; 183 struct zfcp_port *port; 184 unsigned long flags; 185 186 read_lock_irqsave(&zfcp_data.config_lock, flags); 187 list_for_each_entry(port, &adapter->port_list_head, list) 188 if (port->wwpn == wwpn) 189 break; 190 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 191 192 if (port && (port->wwpn == wwpn)) 193 zfcp_erp_port_forced_reopen(port, 0, 83, req); 194} 195 196static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 197{ 198 struct fsf_status_read_buffer *status_buffer = 199 (struct fsf_status_read_buffer *)req->data; 200 struct fsf_plogi *els_plogi = 201 (struct fsf_plogi *) status_buffer->payload.data; 202 203 zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn); 204} 205 206static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 207{ 208 struct fsf_status_read_buffer *status_buffer = 209 (struct fsf_status_read_buffer *)req->data; 210 struct fcp_logo *els_logo = 211 (struct fcp_logo *) status_buffer->payload.data; 212 213 zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn); 214} 215 216/** 217 * zfcp_fc_incoming_els - handle incoming ELS 218 * @fsf_req - request which contains incoming ELS 219 */ 220void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 221{ 222 struct fsf_status_read_buffer *status_buffer = 223 (struct fsf_status_read_buffer *) fsf_req->data; 224 unsigned int els_type = status_buffer->payload.data[0]; 225 226 zfcp_san_dbf_event_incoming_els(fsf_req); 227 if (els_type == LS_PLOGI) 228 zfcp_fc_incoming_plogi(fsf_req); 229 else if (els_type == LS_LOGO) 230 zfcp_fc_incoming_logo(fsf_req); 231 else if (els_type == LS_RSCN) 232 zfcp_fc_incoming_rscn(fsf_req); 233} 234 235static void zfcp_fc_ns_handler(unsigned long data) 236{ 237 struct zfcp_fc_ns_handler_data *compl_rec = 238 (struct zfcp_fc_ns_handler_data *) data; 239 240 if (compl_rec->handler) 241 compl_rec->handler(compl_rec->handler_data); 242 243 complete(&compl_rec->done); 244} 245 246static void zfcp_fc_ns_gid_pn_eval(unsigned long data) 247{ 248 struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data; 249 struct zfcp_send_ct *ct = &gid_pn->ct; 250 struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req); 251 struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp); 252 struct zfcp_port *port = gid_pn->port; 253 254 if (ct->status) 255 return; 256 if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) { 257 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status); 258 return; 259 } 260 /* paranoia */ 261 if (ct_iu_req->wwpn != port->wwpn) 262 return; 263 /* looks like a valid d_id */ 264 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK; 265 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status); 266} 267 268int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action, 269 struct zfcp_gid_pn_data *gid_pn) 270{ 271 struct zfcp_adapter *adapter = erp_action->adapter; 272 struct zfcp_fc_ns_handler_data compl_rec; 273 int ret; 274 275 /* setup parameters for send generic command */ 276 gid_pn->port = erp_action->port; 277 gid_pn->ct.wka_port = &adapter->nsp; 278 gid_pn->ct.handler = zfcp_fc_ns_handler; 279 gid_pn->ct.handler_data = (unsigned long) &compl_rec; 280 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT; 281 gid_pn->ct.req = &gid_pn->req; 282 gid_pn->ct.resp = &gid_pn->resp; 283 gid_pn->ct.req_count = 1; 284 gid_pn->ct.resp_count = 1; 285 sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req, 286 sizeof(struct ct_iu_gid_pn_req)); 287 sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp, 288 sizeof(struct ct_iu_gid_pn_resp)); 289 290 /* setup nameserver request */ 291 gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION; 292 gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE; 293 gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER; 294 gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS; 295 gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN; 296 gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE; 297 gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn; 298 299 init_completion(&compl_rec.done); 300 compl_rec.handler = zfcp_fc_ns_gid_pn_eval; 301 compl_rec.handler_data = (unsigned long) gid_pn; 302 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp, 303 erp_action); 304 if (!ret) 305 wait_for_completion(&compl_rec.done); 306 return ret; 307} 308 309/** 310 * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request 311 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed 312 * return: -ENOMEM on error, 0 otherwise 313 */ 314int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action) 315{ 316 int ret; 317 struct zfcp_gid_pn_data *gid_pn; 318 struct zfcp_adapter *adapter = erp_action->adapter; 319 320 gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC); 321 if (!gid_pn) 322 return -ENOMEM; 323 324 memset(gid_pn, 0, sizeof(*gid_pn)); 325 326 ret = zfcp_wka_port_get(&adapter->nsp); 327 if (ret) 328 goto out; 329 330 ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn); 331 332 zfcp_wka_port_put(&adapter->nsp); 333out: 334 mempool_free(gid_pn, adapter->pool.data_gid_pn); 335 return ret; 336} 337 338/** 339 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 340 * @port: zfcp_port structure 341 * @plogi: plogi payload 342 * 343 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 344 */ 345void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi) 346{ 347 port->maxframe_size = plogi->serv_param.common_serv_param[7] | 348 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8); 349 if (plogi->serv_param.class1_serv_param[0] & 0x80) 350 port->supported_classes |= FC_COS_CLASS1; 351 if (plogi->serv_param.class2_serv_param[0] & 0x80) 352 port->supported_classes |= FC_COS_CLASS2; 353 if (plogi->serv_param.class3_serv_param[0] & 0x80) 354 port->supported_classes |= FC_COS_CLASS3; 355 if (plogi->serv_param.class4_serv_param[0] & 0x80) 356 port->supported_classes |= FC_COS_CLASS4; 357} 358 359struct zfcp_els_adisc { 360 struct zfcp_send_els els; 361 struct scatterlist req; 362 struct scatterlist resp; 363 struct zfcp_ls_adisc ls_adisc; 364 struct zfcp_ls_adisc ls_adisc_acc; 365}; 366 367static void zfcp_fc_adisc_handler(unsigned long data) 368{ 369 struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data; 370 struct zfcp_port *port = adisc->els.port; 371 struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc; 372 373 if (adisc->els.status) { 374 /* request rejected or timed out */ 375 zfcp_erp_port_forced_reopen(port, 0, 63, NULL); 376 goto out; 377 } 378 379 if (!port->wwnn) 380 port->wwnn = ls_adisc->wwnn; 381 382 if (port->wwpn != ls_adisc->wwpn) 383 zfcp_erp_port_reopen(port, 0, 64, NULL); 384 385 out: 386 zfcp_port_put(port); 387 kfree(adisc); 388} 389 390static int zfcp_fc_adisc(struct zfcp_port *port) 391{ 392 struct zfcp_els_adisc *adisc; 393 struct zfcp_adapter *adapter = port->adapter; 394 395 adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC); 396 if (!adisc) 397 return -ENOMEM; 398 399 adisc->els.req = &adisc->req; 400 adisc->els.resp = &adisc->resp; 401 sg_init_one(adisc->els.req, &adisc->ls_adisc, 402 sizeof(struct zfcp_ls_adisc)); 403 sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc, 404 sizeof(struct zfcp_ls_adisc)); 405 406 adisc->els.req_count = 1; 407 adisc->els.resp_count = 1; 408 adisc->els.adapter = adapter; 409 adisc->els.port = port; 410 adisc->els.d_id = port->d_id; 411 adisc->els.handler = zfcp_fc_adisc_handler; 412 adisc->els.handler_data = (unsigned long) adisc; 413 adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC; 414 415 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 416 without FC-AL-2 capability, so we don't set it */ 417 adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host); 418 adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host); 419 adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host); 420 421 return zfcp_fsf_send_els(&adisc->els); 422} 423 424/** 425 * zfcp_test_link - lightweight link test procedure 426 * @port: port to be tested 427 * 428 * Test status of a link to a remote port using the ELS command ADISC. 429 * If there is a problem with the remote port, error recovery steps 430 * will be triggered. 431 */ 432void zfcp_test_link(struct zfcp_port *port) 433{ 434 int retval; 435 436 zfcp_port_get(port); 437 retval = zfcp_fc_adisc(port); 438 if (retval == 0) 439 return; 440 441 /* send of ADISC was not possible */ 442 zfcp_port_put(port); 443 if (retval != -EBUSY) 444 zfcp_erp_port_forced_reopen(port, 0, 65, NULL); 445} 446 447static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft) 448{ 449 struct scatterlist *sg = &gpn_ft->sg_req; 450 451 kfree(sg_virt(sg)); /* free request buffer */ 452 zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS); 453 454 kfree(gpn_ft); 455} 456 457static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void) 458{ 459 struct zfcp_gpn_ft *gpn_ft; 460 struct ct_iu_gpn_ft_req *req; 461 462 gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL); 463 if (!gpn_ft) 464 return NULL; 465 466 req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL); 467 if (!req) { 468 kfree(gpn_ft); 469 gpn_ft = NULL; 470 goto out; 471 } 472 sg_init_one(&gpn_ft->sg_req, req, sizeof(*req)); 473 474 if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) { 475 zfcp_free_sg_env(gpn_ft); 476 gpn_ft = NULL; 477 } 478out: 479 return gpn_ft; 480} 481 482 483static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft, 484 struct zfcp_adapter *adapter) 485{ 486 struct zfcp_send_ct *ct = &gpn_ft->ct; 487 struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req); 488 struct zfcp_fc_ns_handler_data compl_rec; 489 int ret; 490 491 /* prepare CT IU for GPN_FT */ 492 req->header.revision = ZFCP_CT_REVISION; 493 req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE; 494 req->header.gs_subtype = ZFCP_CT_NAME_SERVER; 495 req->header.options = ZFCP_CT_SYNCHRONOUS; 496 req->header.cmd_rsp_code = ZFCP_CT_GPN_FT; 497 req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) * 498 (ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2; 499 req->flags = 0; 500 req->domain_id_scope = 0; 501 req->area_id_scope = 0; 502 req->fc4_type = ZFCP_CT_SCSI_FCP; 503 504 /* prepare zfcp_send_ct */ 505 ct->wka_port = &adapter->nsp; 506 ct->handler = zfcp_fc_ns_handler; 507 ct->handler_data = (unsigned long)&compl_rec; 508 ct->timeout = 10; 509 ct->req = &gpn_ft->sg_req; 510 ct->resp = gpn_ft->sg_resp; 511 ct->req_count = 1; 512 ct->resp_count = ZFCP_GPN_FT_BUFFERS; 513 514 init_completion(&compl_rec.done); 515 compl_rec.handler = NULL; 516 ret = zfcp_fsf_send_ct(ct, NULL, NULL); 517 if (!ret) 518 wait_for_completion(&compl_rec.done); 519 return ret; 520} 521 522static void zfcp_validate_port(struct zfcp_port *port) 523{ 524 struct zfcp_adapter *adapter = port->adapter; 525 526 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); 527 528 if ((port->supported_classes != 0) || 529 !list_empty(&port->unit_list_head)) { 530 zfcp_port_put(port); 531 return; 532 } 533 zfcp_erp_port_shutdown(port, 0, 151, NULL); 534 zfcp_erp_wait(adapter); 535 zfcp_port_put(port); 536 zfcp_port_dequeue(port); 537} 538 539static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft) 540{ 541 struct zfcp_send_ct *ct = &gpn_ft->ct; 542 struct scatterlist *sg = gpn_ft->sg_resp; 543 struct ct_hdr *hdr = sg_virt(sg); 544 struct gpn_ft_resp_acc *acc = sg_virt(sg); 545 struct zfcp_adapter *adapter = ct->wka_port->adapter; 546 struct zfcp_port *port, *tmp; 547 u32 d_id; 548 int ret = 0, x, last = 0; 549 550 if (ct->status) 551 return -EIO; 552 553 if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) { 554 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD) 555 return -EAGAIN; /* might be a temporary condition */ 556 return -EIO; 557 } 558 559 if (hdr->max_res_size) 560 return -E2BIG; 561 562 down(&zfcp_data.config_sema); 563 564 /* first entry is the header */ 565 for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) { 566 if (x % (ZFCP_GPN_FT_ENTRIES + 1)) 567 acc++; 568 else 569 acc = sg_virt(++sg); 570 571 last = acc->control & 0x80; 572 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 | 573 acc->port_id[2]; 574 575 /* don't attach ports with a well known address */ 576 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA) 577 continue; 578 /* skip the adapter's port and known remote ports */ 579 if (acc->wwpn == fc_host_port_name(adapter->scsi_host)) 580 continue; 581 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn); 582 if (port) { 583 zfcp_port_get(port); 584 continue; 585 } 586 587 port = zfcp_port_enqueue(adapter, acc->wwpn, 588 ZFCP_STATUS_PORT_DID_DID | 589 ZFCP_STATUS_COMMON_NOESC, d_id); 590 if (IS_ERR(port)) 591 ret = PTR_ERR(port); 592 else 593 zfcp_erp_port_reopen(port, 0, 149, NULL); 594 } 595 596 zfcp_erp_wait(adapter); 597 list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list) 598 zfcp_validate_port(port); 599 up(&zfcp_data.config_sema); 600 return ret; 601} 602 603/** 604 * zfcp_scan_ports - scan remote ports and attach new ports 605 * @adapter: pointer to struct zfcp_adapter 606 */ 607int zfcp_scan_ports(struct zfcp_adapter *adapter) 608{ 609 int ret, i; 610 struct zfcp_gpn_ft *gpn_ft; 611 612 zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */ 613 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT) 614 return 0; 615 616 ret = zfcp_wka_port_get(&adapter->nsp); 617 if (ret) 618 return ret; 619 620 gpn_ft = zfcp_alloc_sg_env(); 621 if (!gpn_ft) { 622 ret = -ENOMEM; 623 goto out; 624 } 625 626 for (i = 0; i < 3; i++) { 627 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter); 628 if (!ret) { 629 ret = zfcp_scan_eval_gpn_ft(gpn_ft); 630 if (ret == -EAGAIN) 631 ssleep(1); 632 else 633 break; 634 } 635 } 636 zfcp_free_sg_env(gpn_ft); 637out: 638 zfcp_wka_port_put(&adapter->nsp); 639 return ret; 640} 641 642 643void _zfcp_scan_ports_later(struct work_struct *work) 644{ 645 zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work)); 646} 647