zfcp_fc.c revision 317e6b6519b5a34263a33f150ed57ad468b26a64
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 42static 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 54static 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 77static 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 117static 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 133static 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 143static 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 */ 156void 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 171static 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); 191out: 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 */ 200int 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 */ 250void 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 264struct 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 272static 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 295static 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 */ 337void 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 351static 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 371static void zfcp_gpn_ft_handler(unsigned long _done) 372{ 373 complete((struct completion *)_done); 374} 375 376static 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 386static 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 } 407out: 408 return gpn_ft; 409} 410 411 412static 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 450static 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 468static 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 */ 530int 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 563void _zfcp_scan_ports_later(struct work_struct *work) 564{ 565 zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work)); 566} 567