zfcp_fc.c revision cc8c282963bd258a5bf49d3aa52675a4ae6d31f6
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 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_test_mask(ZFCP_STATUS_PORT_WKA, &port->status)) 51 continue; 52 /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */ 53 if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status)) 54 /* Try to connect to unused ports anyway. */ 55 zfcp_erp_port_reopen(port, 56 ZFCP_STATUS_COMMON_ERP_FAILED, 57 82, fsf_req); 58 else if ((port->d_id & range) == (elem->nport_did & range)) 59 /* Check connection status for connected ports */ 60 zfcp_test_link(port); 61 } 62 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 63} 64 65static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 66{ 67 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 68 struct fcp_rscn_head *fcp_rscn_head; 69 struct fcp_rscn_element *fcp_rscn_element; 70 u16 i; 71 u16 no_entries; 72 u32 range_mask; 73 74 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload; 75 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload; 76 77 /* see FC-FS */ 78 no_entries = fcp_rscn_head->payload_len / 79 sizeof(struct fcp_rscn_element); 80 81 for (i = 1; i < no_entries; i++) { 82 /* skip head and start with 1st element */ 83 fcp_rscn_element++; 84 switch (fcp_rscn_element->addr_format) { 85 case ZFCP_PORT_ADDRESS: 86 range_mask = ZFCP_PORTS_RANGE_PORT; 87 break; 88 case ZFCP_AREA_ADDRESS: 89 range_mask = ZFCP_PORTS_RANGE_AREA; 90 break; 91 case ZFCP_DOMAIN_ADDRESS: 92 range_mask = ZFCP_PORTS_RANGE_DOMAIN; 93 break; 94 case ZFCP_FABRIC_ADDRESS: 95 range_mask = ZFCP_PORTS_RANGE_FABRIC; 96 break; 97 default: 98 continue; 99 } 100 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element); 101 } 102 schedule_work(&fsf_req->adapter->scan_work); 103} 104 105static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn) 106{ 107 struct zfcp_adapter *adapter = req->adapter; 108 struct zfcp_port *port; 109 unsigned long flags; 110 111 read_lock_irqsave(&zfcp_data.config_lock, flags); 112 list_for_each_entry(port, &adapter->port_list_head, list) 113 if (port->wwpn == wwpn) 114 break; 115 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 116 117 if (port && (port->wwpn == wwpn)) 118 zfcp_erp_port_forced_reopen(port, 0, 83, req); 119} 120 121static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 122{ 123 struct fsf_status_read_buffer *status_buffer = 124 (struct fsf_status_read_buffer *)req->data; 125 struct fsf_plogi *els_plogi = 126 (struct fsf_plogi *) status_buffer->payload; 127 128 zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn); 129} 130 131static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 132{ 133 struct fsf_status_read_buffer *status_buffer = 134 (struct fsf_status_read_buffer *)req->data; 135 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload; 136 137 zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn); 138} 139 140/** 141 * zfcp_fc_incoming_els - handle incoming ELS 142 * @fsf_req - request which contains incoming ELS 143 */ 144void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 145{ 146 struct fsf_status_read_buffer *status_buffer = 147 (struct fsf_status_read_buffer *) fsf_req->data; 148 unsigned int els_type = status_buffer->payload[0]; 149 150 zfcp_san_dbf_event_incoming_els(fsf_req); 151 if (els_type == LS_PLOGI) 152 zfcp_fc_incoming_plogi(fsf_req); 153 else if (els_type == LS_LOGO) 154 zfcp_fc_incoming_logo(fsf_req); 155 else if (els_type == LS_RSCN) 156 zfcp_fc_incoming_rscn(fsf_req); 157} 158 159static void zfcp_ns_gid_pn_handler(unsigned long data) 160{ 161 struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data; 162 struct zfcp_send_ct *ct = &gid_pn->ct; 163 struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req); 164 struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp); 165 struct zfcp_port *port = gid_pn->port; 166 167 if (ct->status) 168 goto out; 169 if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) { 170 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status); 171 goto out; 172 } 173 /* paranoia */ 174 if (ct_iu_req->wwpn != port->wwpn) 175 goto out; 176 /* looks like a valid d_id */ 177 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK; 178 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status); 179out: 180 mempool_free(gid_pn, port->adapter->pool.data_gid_pn); 181} 182 183/** 184 * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request 185 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed 186 * return: -ENOMEM on error, 0 otherwise 187 */ 188int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action) 189{ 190 int ret; 191 struct zfcp_gid_pn_data *gid_pn; 192 struct zfcp_adapter *adapter = erp_action->adapter; 193 194 gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC); 195 if (!gid_pn) 196 return -ENOMEM; 197 198 memset(gid_pn, 0, sizeof(*gid_pn)); 199 200 /* setup parameters for send generic command */ 201 gid_pn->port = erp_action->port; 202 gid_pn->ct.port = adapter->nameserver_port; 203 gid_pn->ct.handler = zfcp_ns_gid_pn_handler; 204 gid_pn->ct.handler_data = (unsigned long) gid_pn; 205 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT; 206 gid_pn->ct.req = &gid_pn->req; 207 gid_pn->ct.resp = &gid_pn->resp; 208 gid_pn->ct.req_count = 1; 209 gid_pn->ct.resp_count = 1; 210 sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req, 211 sizeof(struct ct_iu_gid_pn_req)); 212 sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp, 213 sizeof(struct ct_iu_gid_pn_resp)); 214 215 /* setup nameserver request */ 216 gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION; 217 gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE; 218 gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER; 219 gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS; 220 gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN; 221 gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE; 222 gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn; 223 224 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp, 225 erp_action); 226 if (ret) 227 mempool_free(gid_pn, adapter->pool.data_gid_pn); 228 return ret; 229} 230 231/** 232 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 233 * @port: zfcp_port structure 234 * @plogi: plogi payload 235 * 236 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 237 */ 238void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi) 239{ 240 port->maxframe_size = plogi->serv_param.common_serv_param[7] | 241 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8); 242 if (plogi->serv_param.class1_serv_param[0] & 0x80) 243 port->supported_classes |= FC_COS_CLASS1; 244 if (plogi->serv_param.class2_serv_param[0] & 0x80) 245 port->supported_classes |= FC_COS_CLASS2; 246 if (plogi->serv_param.class3_serv_param[0] & 0x80) 247 port->supported_classes |= FC_COS_CLASS3; 248 if (plogi->serv_param.class4_serv_param[0] & 0x80) 249 port->supported_classes |= FC_COS_CLASS4; 250} 251 252struct zfcp_els_adisc { 253 struct zfcp_send_els els; 254 struct scatterlist req; 255 struct scatterlist resp; 256 struct zfcp_ls_adisc ls_adisc; 257 struct zfcp_ls_adisc_acc ls_adisc_acc; 258}; 259 260static void zfcp_fc_adisc_handler(unsigned long data) 261{ 262 struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data; 263 struct zfcp_port *port = adisc->els.port; 264 struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc; 265 266 if (!adisc->els.status) { 267 /* request rejected or timed out */ 268 zfcp_erp_port_forced_reopen(port, 0, 63, NULL); 269 goto out; 270 } 271 272 if (!port->wwnn) 273 port->wwnn = ls_adisc->wwnn; 274 275 if (port->wwpn != ls_adisc->wwpn) 276 zfcp_erp_port_reopen(port, 0, 64, NULL); 277 278 out: 279 zfcp_port_put(port); 280 kfree(adisc); 281} 282 283static int zfcp_fc_adisc(struct zfcp_port *port) 284{ 285 struct zfcp_els_adisc *adisc; 286 struct zfcp_adapter *adapter = port->adapter; 287 288 adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC); 289 if (!adisc) 290 return -ENOMEM; 291 292 adisc->els.req = &adisc->req; 293 adisc->els.resp = &adisc->resp; 294 sg_init_one(adisc->els.req, &adisc->ls_adisc, 295 sizeof(struct zfcp_ls_adisc)); 296 sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc, 297 sizeof(struct zfcp_ls_adisc_acc)); 298 299 adisc->els.req_count = 1; 300 adisc->els.resp_count = 1; 301 adisc->els.adapter = adapter; 302 adisc->els.port = port; 303 adisc->els.d_id = port->d_id; 304 adisc->els.handler = zfcp_fc_adisc_handler; 305 adisc->els.handler_data = (unsigned long) adisc; 306 adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC; 307 308 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 309 without FC-AL-2 capability, so we don't set it */ 310 adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host); 311 adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host); 312 adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host); 313 314 return zfcp_fsf_send_els(&adisc->els); 315} 316 317/** 318 * zfcp_test_link - lightweight link test procedure 319 * @port: port to be tested 320 * 321 * Test status of a link to a remote port using the ELS command ADISC. 322 * If there is a problem with the remote port, error recovery steps 323 * will be triggered. 324 */ 325void zfcp_test_link(struct zfcp_port *port) 326{ 327 int retval; 328 329 zfcp_port_get(port); 330 retval = zfcp_fc_adisc(port); 331 if (retval == 0 || retval == -EBUSY) 332 return; 333 334 /* send of ADISC was not possible */ 335 zfcp_port_put(port); 336 zfcp_erp_port_forced_reopen(port, 0, 65, NULL); 337} 338 339static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter) 340{ 341 int ret; 342 343 if (!adapter->nameserver_port) 344 return -EINTR; 345 346 if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, 347 &adapter->nameserver_port->status)) { 348 ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148, 349 NULL); 350 if (ret) 351 return ret; 352 zfcp_erp_wait(adapter); 353 zfcp_port_put(adapter->nameserver_port); 354 } 355 return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, 356 &adapter->nameserver_port->status); 357} 358 359static void zfcp_gpn_ft_handler(unsigned long _done) 360{ 361 complete((struct completion *)_done); 362} 363 364static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft) 365{ 366 struct scatterlist *sg = &gpn_ft->sg_req; 367 368 kfree(sg_virt(sg)); /* free request buffer */ 369 zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS); 370 371 kfree(gpn_ft); 372} 373 374static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void) 375{ 376 struct zfcp_gpn_ft *gpn_ft; 377 struct ct_iu_gpn_ft_req *req; 378 379 gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL); 380 if (!gpn_ft) 381 return NULL; 382 383 req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL); 384 if (!req) { 385 kfree(gpn_ft); 386 gpn_ft = NULL; 387 goto out; 388 } 389 sg_init_one(&gpn_ft->sg_req, req, sizeof(*req)); 390 391 if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) { 392 zfcp_free_sg_env(gpn_ft); 393 gpn_ft = NULL; 394 } 395out: 396 return gpn_ft; 397} 398 399 400static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft, 401 struct zfcp_adapter *adapter) 402{ 403 struct zfcp_send_ct *ct = &gpn_ft->ct; 404 struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req); 405 struct completion done; 406 int ret; 407 408 /* prepare CT IU for GPN_FT */ 409 req->header.revision = ZFCP_CT_REVISION; 410 req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE; 411 req->header.gs_subtype = ZFCP_CT_NAME_SERVER; 412 req->header.options = ZFCP_CT_SYNCHRONOUS; 413 req->header.cmd_rsp_code = ZFCP_CT_GPN_FT; 414 req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) * 415 (ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2; 416 req->flags = 0; 417 req->domain_id_scope = 0; 418 req->area_id_scope = 0; 419 req->fc4_type = ZFCP_CT_SCSI_FCP; 420 421 /* prepare zfcp_send_ct */ 422 ct->port = adapter->nameserver_port; 423 ct->handler = zfcp_gpn_ft_handler; 424 ct->handler_data = (unsigned long)&done; 425 ct->timeout = 10; 426 ct->req = &gpn_ft->sg_req; 427 ct->resp = gpn_ft->sg_resp; 428 ct->req_count = 1; 429 ct->resp_count = ZFCP_GPN_FT_BUFFERS; 430 431 init_completion(&done); 432 ret = zfcp_fsf_send_ct(ct, NULL, NULL); 433 if (!ret) 434 wait_for_completion(&done); 435 return ret; 436} 437 438static void zfcp_validate_port(struct zfcp_port *port) 439{ 440 struct zfcp_adapter *adapter = port->adapter; 441 442 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); 443 444 if (port == adapter->nameserver_port) 445 return; 446 if ((port->supported_classes != 0) || (port->units != 0)) { 447 zfcp_port_put(port); 448 return; 449 } 450 zfcp_erp_port_shutdown(port, 0, 151, NULL); 451 zfcp_erp_wait(adapter); 452 zfcp_port_put(port); 453 zfcp_port_dequeue(port); 454} 455 456static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft) 457{ 458 struct zfcp_send_ct *ct = &gpn_ft->ct; 459 struct scatterlist *sg = gpn_ft->sg_resp; 460 struct ct_hdr *hdr = sg_virt(sg); 461 struct gpn_ft_resp_acc *acc = sg_virt(sg); 462 struct zfcp_adapter *adapter = ct->port->adapter; 463 struct zfcp_port *port, *tmp; 464 u32 d_id; 465 int ret = 0, x; 466 467 if (ct->status) 468 return -EIO; 469 470 if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) { 471 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD) 472 return -EAGAIN; /* might be a temporary condition */ 473 return -EIO; 474 } 475 476 if (hdr->max_res_size) 477 return -E2BIG; 478 479 down(&zfcp_data.config_sema); 480 481 /* first entry is the header */ 482 for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) { 483 if (x % (ZFCP_GPN_FT_ENTRIES + 1)) 484 acc++; 485 else 486 acc = sg_virt(++sg); 487 488 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 | 489 acc->port_id[2]; 490 491 /* skip the adapter's port and known remote ports */ 492 if (acc->wwpn == fc_host_port_name(adapter->scsi_host) || 493 zfcp_get_port_by_did(adapter, d_id)) 494 continue; 495 496 port = zfcp_port_enqueue(adapter, acc->wwpn, 497 ZFCP_STATUS_PORT_DID_DID | 498 ZFCP_STATUS_COMMON_NOESC, d_id); 499 if (port) 500 zfcp_erp_port_reopen(port, 0, 149, NULL); 501 else 502 ret = -ENOMEM; 503 if (acc->control & 0x80) /* last entry */ 504 break; 505 } 506 507 zfcp_erp_wait(adapter); 508 list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list) 509 zfcp_validate_port(port); 510 up(&zfcp_data.config_sema); 511 return ret; 512} 513 514/** 515 * zfcp_scan_ports - scan remote ports and attach new ports 516 * @adapter: pointer to struct zfcp_adapter 517 */ 518int zfcp_scan_ports(struct zfcp_adapter *adapter) 519{ 520 int ret, i; 521 struct zfcp_gpn_ft *gpn_ft; 522 523 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT) 524 return 0; 525 526 ret = zfcp_scan_get_nameserver(adapter); 527 if (ret) 528 return ret; 529 530 gpn_ft = zfcp_alloc_sg_env(); 531 if (!gpn_ft) 532 return -ENOMEM; 533 534 for (i = 0; i < 3; i++) { 535 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter); 536 if (!ret) { 537 ret = zfcp_scan_eval_gpn_ft(gpn_ft); 538 if (ret == -EAGAIN) 539 ssleep(1); 540 else 541 break; 542 } 543 } 544 zfcp_free_sg_env(gpn_ft); 545 546 return ret; 547} 548 549 550void _zfcp_scan_ports_later(struct work_struct *work) 551{ 552 zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work)); 553} 554