1/* 2 * zfcp device driver 3 * 4 * Fibre Channel related functions for the zfcp device driver. 5 * 6 * Copyright IBM Corp. 2008, 2010 7 */ 8 9#define KMSG_COMPONENT "zfcp" 10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12#include <linux/types.h> 13#include <linux/slab.h> 14#include <linux/utsname.h> 15#include <scsi/fc/fc_els.h> 16#include <scsi/libfc.h> 17#include "zfcp_ext.h" 18#include "zfcp_fc.h" 19 20struct kmem_cache *zfcp_fc_req_cache; 21 22static u32 zfcp_fc_rscn_range_mask[] = { 23 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 24 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 25 [ELS_ADDR_FMT_DOM] = 0xFF0000, 26 [ELS_ADDR_FMT_FAB] = 0x000000, 27}; 28 29static bool no_auto_port_rescan; 30module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600); 31MODULE_PARM_DESC(no_auto_port_rescan, 32 "no automatic port_rescan (default off)"); 33 34void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) 35{ 36 if (no_auto_port_rescan) 37 return; 38 39 queue_work(adapter->work_queue, &adapter->scan_work); 40} 41 42void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) 43{ 44 if (!no_auto_port_rescan) 45 return; 46 47 queue_work(adapter->work_queue, &adapter->scan_work); 48} 49 50/** 51 * zfcp_fc_post_event - post event to userspace via fc_transport 52 * @work: work struct with enqueued events 53 */ 54void zfcp_fc_post_event(struct work_struct *work) 55{ 56 struct zfcp_fc_event *event = NULL, *tmp = NULL; 57 LIST_HEAD(tmp_lh); 58 struct zfcp_fc_events *events = container_of(work, 59 struct zfcp_fc_events, work); 60 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 61 events); 62 63 spin_lock_bh(&events->list_lock); 64 list_splice_init(&events->list, &tmp_lh); 65 spin_unlock_bh(&events->list_lock); 66 67 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 68 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 69 event->code, event->data); 70 list_del(&event->list); 71 kfree(event); 72 } 73 74} 75 76/** 77 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 78 * @adapter: The adapter where to enqueue the event 79 * @event_code: The event code (as defined in fc_host_event_code in 80 * scsi_transport_fc.h) 81 * @event_data: The event data (e.g. n_port page in case of els) 82 */ 83void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 84 enum fc_host_event_code event_code, u32 event_data) 85{ 86 struct zfcp_fc_event *event; 87 88 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 89 if (!event) 90 return; 91 92 event->code = event_code; 93 event->data = event_data; 94 95 spin_lock(&adapter->events.list_lock); 96 list_add_tail(&event->list, &adapter->events.list); 97 spin_unlock(&adapter->events.list_lock); 98 99 queue_work(adapter->work_queue, &adapter->events.work); 100} 101 102static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 103{ 104 if (mutex_lock_interruptible(&wka_port->mutex)) 105 return -ERESTARTSYS; 106 107 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 108 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 109 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 110 if (zfcp_fsf_open_wka_port(wka_port)) 111 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 112 } 113 114 mutex_unlock(&wka_port->mutex); 115 116 wait_event(wka_port->completion_wq, 117 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 118 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 119 120 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 121 atomic_inc(&wka_port->refcount); 122 return 0; 123 } 124 return -EIO; 125} 126 127static void zfcp_fc_wka_port_offline(struct work_struct *work) 128{ 129 struct delayed_work *dw = to_delayed_work(work); 130 struct zfcp_fc_wka_port *wka_port = 131 container_of(dw, struct zfcp_fc_wka_port, work); 132 133 mutex_lock(&wka_port->mutex); 134 if ((atomic_read(&wka_port->refcount) != 0) || 135 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 136 goto out; 137 138 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 139 if (zfcp_fsf_close_wka_port(wka_port)) { 140 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 141 wake_up(&wka_port->completion_wq); 142 } 143out: 144 mutex_unlock(&wka_port->mutex); 145} 146 147static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 148{ 149 if (atomic_dec_return(&wka_port->refcount) != 0) 150 return; 151 /* wait 10 milliseconds, other reqs might pop in */ 152 schedule_delayed_work(&wka_port->work, HZ / 100); 153} 154 155static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 156 struct zfcp_adapter *adapter) 157{ 158 init_waitqueue_head(&wka_port->completion_wq); 159 160 wka_port->adapter = adapter; 161 wka_port->d_id = d_id; 162 163 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 164 atomic_set(&wka_port->refcount, 0); 165 mutex_init(&wka_port->mutex); 166 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 167} 168 169static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 170{ 171 cancel_delayed_work_sync(&wka->work); 172 mutex_lock(&wka->mutex); 173 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 174 mutex_unlock(&wka->mutex); 175} 176 177void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 178{ 179 if (!gs) 180 return; 181 zfcp_fc_wka_port_force_offline(&gs->ms); 182 zfcp_fc_wka_port_force_offline(&gs->ts); 183 zfcp_fc_wka_port_force_offline(&gs->ds); 184 zfcp_fc_wka_port_force_offline(&gs->as); 185} 186 187static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 188 struct fc_els_rscn_page *page) 189{ 190 unsigned long flags; 191 struct zfcp_adapter *adapter = fsf_req->adapter; 192 struct zfcp_port *port; 193 194 read_lock_irqsave(&adapter->port_list_lock, flags); 195 list_for_each_entry(port, &adapter->port_list, list) { 196 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 197 zfcp_fc_test_link(port); 198 if (!port->d_id) 199 zfcp_erp_port_reopen(port, 200 ZFCP_STATUS_COMMON_ERP_FAILED, 201 "fcrscn1"); 202 } 203 read_unlock_irqrestore(&adapter->port_list_lock, flags); 204} 205 206static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 207{ 208 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 209 struct fc_els_rscn *head; 210 struct fc_els_rscn_page *page; 211 u16 i; 212 u16 no_entries; 213 unsigned int afmt; 214 215 head = (struct fc_els_rscn *) status_buffer->payload.data; 216 page = (struct fc_els_rscn_page *) head; 217 218 /* see FC-FS */ 219 no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page); 220 221 for (i = 1; i < no_entries; i++) { 222 /* skip head and start with 1st element */ 223 page++; 224 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 225 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 226 page); 227 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 228 *(u32 *)page); 229 } 230 zfcp_fc_conditional_port_scan(fsf_req->adapter); 231} 232 233static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 234{ 235 unsigned long flags; 236 struct zfcp_adapter *adapter = req->adapter; 237 struct zfcp_port *port; 238 239 read_lock_irqsave(&adapter->port_list_lock, flags); 240 list_for_each_entry(port, &adapter->port_list, list) 241 if (port->wwpn == wwpn) { 242 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 243 break; 244 } 245 read_unlock_irqrestore(&adapter->port_list_lock, flags); 246} 247 248static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 249{ 250 struct fsf_status_read_buffer *status_buffer; 251 struct fc_els_flogi *plogi; 252 253 status_buffer = (struct fsf_status_read_buffer *) req->data; 254 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 255 zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn); 256} 257 258static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 259{ 260 struct fsf_status_read_buffer *status_buffer = 261 (struct fsf_status_read_buffer *)req->data; 262 struct fc_els_logo *logo = 263 (struct fc_els_logo *) status_buffer->payload.data; 264 265 zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn); 266} 267 268/** 269 * zfcp_fc_incoming_els - handle incoming ELS 270 * @fsf_req - request which contains incoming ELS 271 */ 272void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 273{ 274 struct fsf_status_read_buffer *status_buffer = 275 (struct fsf_status_read_buffer *) fsf_req->data; 276 unsigned int els_type = status_buffer->payload.data[0]; 277 278 zfcp_dbf_san_in_els("fciels1", fsf_req); 279 if (els_type == ELS_PLOGI) 280 zfcp_fc_incoming_plogi(fsf_req); 281 else if (els_type == ELS_LOGO) 282 zfcp_fc_incoming_logo(fsf_req); 283 else if (els_type == ELS_RSCN) 284 zfcp_fc_incoming_rscn(fsf_req); 285} 286 287static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 288{ 289 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 290 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 291 292 if (ct_els->status) 293 return; 294 if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC) 295 return; 296 297 /* looks like a valid d_id */ 298 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 299} 300 301static void zfcp_fc_complete(void *data) 302{ 303 complete(data); 304} 305 306static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 307{ 308 ct_hdr->ct_rev = FC_CT_REV; 309 ct_hdr->ct_fs_type = FC_FST_DIR; 310 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 311 ct_hdr->ct_cmd = cmd; 312 ct_hdr->ct_mr_size = mr_size / 4; 313} 314 315static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 316 struct zfcp_fc_req *fc_req) 317{ 318 struct zfcp_adapter *adapter = port->adapter; 319 DECLARE_COMPLETION_ONSTACK(completion); 320 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 321 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 322 int ret; 323 324 /* setup parameters for send generic command */ 325 fc_req->ct_els.port = port; 326 fc_req->ct_els.handler = zfcp_fc_complete; 327 fc_req->ct_els.handler_data = &completion; 328 fc_req->ct_els.req = &fc_req->sg_req; 329 fc_req->ct_els.resp = &fc_req->sg_rsp; 330 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 331 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 332 333 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 334 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 335 gid_pn_req->gid_pn.fn_wwpn = port->wwpn; 336 337 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 338 adapter->pool.gid_pn_req, 339 ZFCP_FC_CTELS_TMO); 340 if (!ret) { 341 wait_for_completion(&completion); 342 zfcp_fc_ns_gid_pn_eval(fc_req); 343 } 344 return ret; 345} 346 347/** 348 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 349 * @port: port where GID_PN request is needed 350 * return: -ENOMEM on error, 0 otherwise 351 */ 352static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 353{ 354 int ret; 355 struct zfcp_fc_req *fc_req; 356 struct zfcp_adapter *adapter = port->adapter; 357 358 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 359 if (!fc_req) 360 return -ENOMEM; 361 362 memset(fc_req, 0, sizeof(*fc_req)); 363 364 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 365 if (ret) 366 goto out; 367 368 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 369 370 zfcp_fc_wka_port_put(&adapter->gs->ds); 371out: 372 mempool_free(fc_req, adapter->pool.gid_pn); 373 return ret; 374} 375 376void zfcp_fc_port_did_lookup(struct work_struct *work) 377{ 378 int ret; 379 struct zfcp_port *port = container_of(work, struct zfcp_port, 380 gid_pn_work); 381 382 ret = zfcp_fc_ns_gid_pn(port); 383 if (ret) { 384 /* could not issue gid_pn for some reason */ 385 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 386 goto out; 387 } 388 389 if (!port->d_id) { 390 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 391 goto out; 392 } 393 394 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 395out: 396 put_device(&port->dev); 397} 398 399/** 400 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 401 * @port: The zfcp_port to lookup the d_id for. 402 */ 403void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 404{ 405 get_device(&port->dev); 406 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 407 put_device(&port->dev); 408} 409 410/** 411 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 412 * @port: zfcp_port structure 413 * @plogi: plogi payload 414 * 415 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 416 */ 417void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 418{ 419 if (plogi->fl_wwpn != port->wwpn) { 420 port->d_id = 0; 421 dev_warn(&port->adapter->ccw_device->dev, 422 "A port opened with WWPN 0x%016Lx returned data that " 423 "identifies it as WWPN 0x%016Lx\n", 424 (unsigned long long) port->wwpn, 425 (unsigned long long) plogi->fl_wwpn); 426 return; 427 } 428 429 port->wwnn = plogi->fl_wwnn; 430 port->maxframe_size = plogi->fl_csp.sp_bb_data; 431 432 if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID) 433 port->supported_classes |= FC_COS_CLASS1; 434 if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID) 435 port->supported_classes |= FC_COS_CLASS2; 436 if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID) 437 port->supported_classes |= FC_COS_CLASS3; 438 if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID) 439 port->supported_classes |= FC_COS_CLASS4; 440} 441 442static void zfcp_fc_adisc_handler(void *data) 443{ 444 struct zfcp_fc_req *fc_req = data; 445 struct zfcp_port *port = fc_req->ct_els.port; 446 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 447 448 if (fc_req->ct_els.status) { 449 /* request rejected or timed out */ 450 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 451 "fcadh_1"); 452 goto out; 453 } 454 455 if (!port->wwnn) 456 port->wwnn = adisc_resp->adisc_wwnn; 457 458 if ((port->wwpn != adisc_resp->adisc_wwpn) || 459 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 460 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 461 "fcadh_2"); 462 goto out; 463 } 464 465 /* port is good, unblock rport without going through erp */ 466 zfcp_scsi_schedule_rport_register(port); 467 out: 468 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 469 put_device(&port->dev); 470 kmem_cache_free(zfcp_fc_req_cache, fc_req); 471} 472 473static int zfcp_fc_adisc(struct zfcp_port *port) 474{ 475 struct zfcp_fc_req *fc_req; 476 struct zfcp_adapter *adapter = port->adapter; 477 struct Scsi_Host *shost = adapter->scsi_host; 478 int ret; 479 480 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 481 if (!fc_req) 482 return -ENOMEM; 483 484 fc_req->ct_els.port = port; 485 fc_req->ct_els.req = &fc_req->sg_req; 486 fc_req->ct_els.resp = &fc_req->sg_rsp; 487 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 488 sizeof(struct fc_els_adisc)); 489 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 490 sizeof(struct fc_els_adisc)); 491 492 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 493 fc_req->ct_els.handler_data = fc_req; 494 495 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 496 without FC-AL-2 capability, so we don't set it */ 497 fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost); 498 fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost); 499 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 500 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 501 502 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, 503 ZFCP_FC_CTELS_TMO); 504 if (ret) 505 kmem_cache_free(zfcp_fc_req_cache, fc_req); 506 507 return ret; 508} 509 510void zfcp_fc_link_test_work(struct work_struct *work) 511{ 512 struct zfcp_port *port = 513 container_of(work, struct zfcp_port, test_link_work); 514 int retval; 515 516 get_device(&port->dev); 517 port->rport_task = RPORT_DEL; 518 zfcp_scsi_rport_work(&port->rport_work); 519 520 /* only issue one test command at one time per port */ 521 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 522 goto out; 523 524 atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 525 526 retval = zfcp_fc_adisc(port); 527 if (retval == 0) 528 return; 529 530 /* send of ADISC was not possible */ 531 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 532 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 533 534out: 535 put_device(&port->dev); 536} 537 538/** 539 * zfcp_fc_test_link - lightweight link test procedure 540 * @port: port to be tested 541 * 542 * Test status of a link to a remote port using the ELS command ADISC. 543 * If there is a problem with the remote port, error recovery steps 544 * will be triggered. 545 */ 546void zfcp_fc_test_link(struct zfcp_port *port) 547{ 548 get_device(&port->dev); 549 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 550 put_device(&port->dev); 551} 552 553static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) 554{ 555 struct zfcp_fc_req *fc_req; 556 557 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 558 if (!fc_req) 559 return NULL; 560 561 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 562 kmem_cache_free(zfcp_fc_req_cache, fc_req); 563 return NULL; 564 } 565 566 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 567 sizeof(struct zfcp_fc_gpn_ft_req)); 568 569 return fc_req; 570} 571 572static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 573 struct zfcp_adapter *adapter, int max_bytes) 574{ 575 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 576 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 577 DECLARE_COMPLETION_ONSTACK(completion); 578 int ret; 579 580 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 581 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 582 583 ct_els->handler = zfcp_fc_complete; 584 ct_els->handler_data = &completion; 585 ct_els->req = &fc_req->sg_req; 586 ct_els->resp = &fc_req->sg_rsp; 587 588 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 589 ZFCP_FC_CTELS_TMO); 590 if (!ret) 591 wait_for_completion(&completion); 592 return ret; 593} 594 595static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 596{ 597 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 598 return; 599 600 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); 601 602 if ((port->supported_classes != 0) || 603 !list_empty(&port->unit_list)) 604 return; 605 606 list_move_tail(&port->list, lh); 607} 608 609static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 610 struct zfcp_adapter *adapter, int max_entries) 611{ 612 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 613 struct scatterlist *sg = &fc_req->sg_rsp; 614 struct fc_ct_hdr *hdr = sg_virt(sg); 615 struct fc_gpn_ft_resp *acc = sg_virt(sg); 616 struct zfcp_port *port, *tmp; 617 unsigned long flags; 618 LIST_HEAD(remove_lh); 619 u32 d_id; 620 int ret = 0, x, last = 0; 621 622 if (ct_els->status) 623 return -EIO; 624 625 if (hdr->ct_cmd != FC_FS_ACC) { 626 if (hdr->ct_reason == FC_BA_RJT_UNABLE) 627 return -EAGAIN; /* might be a temporary condition */ 628 return -EIO; 629 } 630 631 if (hdr->ct_mr_size) { 632 dev_warn(&adapter->ccw_device->dev, 633 "The name server reported %d words residual data\n", 634 hdr->ct_mr_size); 635 return -E2BIG; 636 } 637 638 /* first entry is the header */ 639 for (x = 1; x < max_entries && !last; x++) { 640 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 641 acc++; 642 else 643 acc = sg_virt(++sg); 644 645 last = acc->fp_flags & FC_NS_FID_LAST; 646 d_id = ntoh24(acc->fp_fid); 647 648 /* don't attach ports with a well known address */ 649 if (d_id >= FC_FID_WELL_KNOWN_BASE) 650 continue; 651 /* skip the adapter's port and known remote ports */ 652 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host)) 653 continue; 654 655 port = zfcp_port_enqueue(adapter, acc->fp_wwpn, 656 ZFCP_STATUS_COMMON_NOESC, d_id); 657 if (!IS_ERR(port)) 658 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 659 else if (PTR_ERR(port) != -EEXIST) 660 ret = PTR_ERR(port); 661 } 662 663 zfcp_erp_wait(adapter); 664 write_lock_irqsave(&adapter->port_list_lock, flags); 665 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 666 zfcp_fc_validate_port(port, &remove_lh); 667 write_unlock_irqrestore(&adapter->port_list_lock, flags); 668 669 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 670 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 671 device_unregister(&port->dev); 672 } 673 674 return ret; 675} 676 677/** 678 * zfcp_fc_scan_ports - scan remote ports and attach new ports 679 * @work: reference to scheduled work 680 */ 681void zfcp_fc_scan_ports(struct work_struct *work) 682{ 683 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 684 scan_work); 685 int ret, i; 686 struct zfcp_fc_req *fc_req; 687 int chain, max_entries, buf_num, max_bytes; 688 689 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 690 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 691 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 692 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 693 694 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 695 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 696 return; 697 698 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 699 return; 700 701 fc_req = zfcp_alloc_sg_env(buf_num); 702 if (!fc_req) 703 goto out; 704 705 for (i = 0; i < 3; i++) { 706 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 707 if (!ret) { 708 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 709 if (ret == -EAGAIN) 710 ssleep(1); 711 else 712 break; 713 } 714 } 715 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); 716 kmem_cache_free(zfcp_fc_req_cache, fc_req); 717out: 718 zfcp_fc_wka_port_put(&adapter->gs->ds); 719} 720 721static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 722 struct zfcp_fc_req *fc_req) 723{ 724 DECLARE_COMPLETION_ONSTACK(completion); 725 char devno[] = "DEVNO:"; 726 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 727 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 728 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 729 int ret; 730 731 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 732 FC_SYMBOLIC_NAME_SIZE); 733 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 734 735 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 736 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 737 738 ct_els->handler = zfcp_fc_complete; 739 ct_els->handler_data = &completion; 740 ct_els->req = &fc_req->sg_req; 741 ct_els->resp = &fc_req->sg_rsp; 742 743 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 744 ZFCP_FC_CTELS_TMO); 745 if (ret) 746 return ret; 747 748 wait_for_completion(&completion); 749 if (ct_els->status) 750 return ct_els->status; 751 752 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 753 !(strstr(gspn_rsp->gspn.fp_name, devno))) 754 snprintf(fc_host_symbolic_name(adapter->scsi_host), 755 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 756 gspn_rsp->gspn.fp_name, devno, 757 dev_name(&adapter->ccw_device->dev), 758 init_utsname()->nodename); 759 else 760 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 761 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 762 763 return 0; 764} 765 766static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 767 struct zfcp_fc_req *fc_req) 768{ 769 DECLARE_COMPLETION_ONSTACK(completion); 770 struct Scsi_Host *shost = adapter->scsi_host; 771 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 772 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 773 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 774 int ret, len; 775 776 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 777 FC_SYMBOLIC_NAME_SIZE); 778 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 779 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 780 FC_SYMBOLIC_NAME_SIZE); 781 rspn_req->rspn.fr_name_len = len; 782 783 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 784 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 785 786 ct_els->handler = zfcp_fc_complete; 787 ct_els->handler_data = &completion; 788 ct_els->req = &fc_req->sg_req; 789 ct_els->resp = &fc_req->sg_rsp; 790 791 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 792 ZFCP_FC_CTELS_TMO); 793 if (!ret) 794 wait_for_completion(&completion); 795} 796 797/** 798 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 799 * @work: ns_up_work of the adapter where to update the symbolic port name 800 * 801 * Retrieve the current symbolic port name that may have been set by 802 * the hardware using the GSPN request and update the fc_host 803 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 804 * the port name is unique for this system), update the symbolic port 805 * name to add Linux specific information and update the FC nameserver 806 * using the RSPN request. 807 */ 808void zfcp_fc_sym_name_update(struct work_struct *work) 809{ 810 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 811 ns_up_work); 812 int ret; 813 struct zfcp_fc_req *fc_req; 814 815 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 816 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 817 return; 818 819 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 820 if (!fc_req) 821 return; 822 823 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 824 if (ret) 825 goto out_free; 826 827 ret = zfcp_fc_gspn(adapter, fc_req); 828 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 829 goto out_ds_put; 830 831 memset(fc_req, 0, sizeof(*fc_req)); 832 zfcp_fc_rspn(adapter, fc_req); 833 834out_ds_put: 835 zfcp_fc_wka_port_put(&adapter->gs->ds); 836out_free: 837 kmem_cache_free(zfcp_fc_req_cache, fc_req); 838} 839 840static void zfcp_fc_ct_els_job_handler(void *data) 841{ 842 struct fc_bsg_job *job = data; 843 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 844 struct fc_bsg_reply *jr = job->reply; 845 846 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 847 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 848 jr->result = zfcp_ct_els->status ? -EIO : 0; 849 job->job_done(job); 850} 851 852static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job) 853{ 854 u32 preamble_word1; 855 u8 gs_type; 856 struct zfcp_adapter *adapter; 857 858 preamble_word1 = job->request->rqst_data.r_ct.preamble_word1; 859 gs_type = (preamble_word1 & 0xff000000) >> 24; 860 861 adapter = (struct zfcp_adapter *) job->shost->hostdata[0]; 862 863 switch (gs_type) { 864 case FC_FST_ALIAS: 865 return &adapter->gs->as; 866 case FC_FST_MGMT: 867 return &adapter->gs->ms; 868 case FC_FST_TIME: 869 return &adapter->gs->ts; 870 break; 871 case FC_FST_DIR: 872 return &adapter->gs->ds; 873 break; 874 default: 875 return NULL; 876 } 877} 878 879static void zfcp_fc_ct_job_handler(void *data) 880{ 881 struct fc_bsg_job *job = data; 882 struct zfcp_fc_wka_port *wka_port; 883 884 wka_port = zfcp_fc_job_wka_port(job); 885 zfcp_fc_wka_port_put(wka_port); 886 887 zfcp_fc_ct_els_job_handler(data); 888} 889 890static int zfcp_fc_exec_els_job(struct fc_bsg_job *job, 891 struct zfcp_adapter *adapter) 892{ 893 struct zfcp_fsf_ct_els *els = job->dd_data; 894 struct fc_rport *rport = job->rport; 895 struct zfcp_port *port; 896 u32 d_id; 897 898 if (rport) { 899 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 900 if (!port) 901 return -EINVAL; 902 903 d_id = port->d_id; 904 put_device(&port->dev); 905 } else 906 d_id = ntoh24(job->request->rqst_data.h_els.port_id); 907 908 els->handler = zfcp_fc_ct_els_job_handler; 909 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 910} 911 912static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job, 913 struct zfcp_adapter *adapter) 914{ 915 int ret; 916 struct zfcp_fsf_ct_els *ct = job->dd_data; 917 struct zfcp_fc_wka_port *wka_port; 918 919 wka_port = zfcp_fc_job_wka_port(job); 920 if (!wka_port) 921 return -EINVAL; 922 923 ret = zfcp_fc_wka_port_get(wka_port); 924 if (ret) 925 return ret; 926 927 ct->handler = zfcp_fc_ct_job_handler; 928 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 929 if (ret) 930 zfcp_fc_wka_port_put(wka_port); 931 932 return ret; 933} 934 935int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job) 936{ 937 struct Scsi_Host *shost; 938 struct zfcp_adapter *adapter; 939 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 940 941 shost = job->rport ? rport_to_shost(job->rport) : job->shost; 942 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 943 944 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 945 return -EINVAL; 946 947 ct_els->req = job->request_payload.sg_list; 948 ct_els->resp = job->reply_payload.sg_list; 949 ct_els->handler_data = job; 950 951 switch (job->request->msgcode) { 952 case FC_BSG_RPT_ELS: 953 case FC_BSG_HST_ELS_NOLOGIN: 954 return zfcp_fc_exec_els_job(job, adapter); 955 case FC_BSG_RPT_CT: 956 case FC_BSG_HST_CT: 957 return zfcp_fc_exec_ct_job(job, adapter); 958 default: 959 return -EINVAL; 960 } 961} 962 963int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job) 964{ 965 /* hardware tracks timeout, reset bsg timeout to not interfere */ 966 return -EAGAIN; 967} 968 969int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 970{ 971 struct zfcp_fc_wka_ports *wka_ports; 972 973 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 974 if (!wka_ports) 975 return -ENOMEM; 976 977 adapter->gs = wka_ports; 978 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 979 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 980 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 981 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 982 983 return 0; 984} 985 986void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 987{ 988 kfree(adapter->gs); 989 adapter->gs = NULL; 990} 991 992