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 } 568