1/* 2 * zfcp device driver 3 * 4 * Fibre Channel related functions for the zfcp device driver. 5 * 6 * Copyright IBM Corporation 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 <scsi/fc/fc_els.h> 15#include <scsi/libfc.h> 16#include "zfcp_ext.h" 17#include "zfcp_fc.h" 18 19static u32 zfcp_fc_rscn_range_mask[] = { 20 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 21 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 22 [ELS_ADDR_FMT_DOM] = 0xFF0000, 23 [ELS_ADDR_FMT_FAB] = 0x000000, 24}; 25 26/** 27 * zfcp_fc_post_event - post event to userspace via fc_transport 28 * @work: work struct with enqueued events 29 */ 30void zfcp_fc_post_event(struct work_struct *work) 31{ 32 struct zfcp_fc_event *event = NULL, *tmp = NULL; 33 LIST_HEAD(tmp_lh); 34 struct zfcp_fc_events *events = container_of(work, 35 struct zfcp_fc_events, work); 36 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 37 events); 38 39 spin_lock_bh(&events->list_lock); 40 list_splice_init(&events->list, &tmp_lh); 41 spin_unlock_bh(&events->list_lock); 42 43 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 44 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 45 event->code, event->data); 46 list_del(&event->list); 47 kfree(event); 48 } 49 50} 51 52/** 53 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 54 * @adapter: The adapter where to enqueue the event 55 * @event_code: The event code (as defined in fc_host_event_code in 56 * scsi_transport_fc.h) 57 * @event_data: The event data (e.g. n_port page in case of els) 58 */ 59void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 60 enum fc_host_event_code event_code, u32 event_data) 61{ 62 struct zfcp_fc_event *event; 63 64 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 65 if (!event) 66 return; 67 68 event->code = event_code; 69 event->data = event_data; 70 71 spin_lock(&adapter->events.list_lock); 72 list_add_tail(&event->list, &adapter->events.list); 73 spin_unlock(&adapter->events.list_lock); 74 75 queue_work(adapter->work_queue, &adapter->events.work); 76} 77 78static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 79{ 80 if (mutex_lock_interruptible(&wka_port->mutex)) 81 return -ERESTARTSYS; 82 83 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 84 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 85 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 86 if (zfcp_fsf_open_wka_port(wka_port)) 87 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 88 } 89 90 mutex_unlock(&wka_port->mutex); 91 92 wait_event(wka_port->completion_wq, 93 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 94 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 95 96 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 97 atomic_inc(&wka_port->refcount); 98 return 0; 99 } 100 return -EIO; 101} 102 103static void zfcp_fc_wka_port_offline(struct work_struct *work) 104{ 105 struct delayed_work *dw = to_delayed_work(work); 106 struct zfcp_fc_wka_port *wka_port = 107 container_of(dw, struct zfcp_fc_wka_port, work); 108 109 mutex_lock(&wka_port->mutex); 110 if ((atomic_read(&wka_port->refcount) != 0) || 111 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 112 goto out; 113 114 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 115 if (zfcp_fsf_close_wka_port(wka_port)) { 116 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 117 wake_up(&wka_port->completion_wq); 118 } 119out: 120 mutex_unlock(&wka_port->mutex); 121} 122 123static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 124{ 125 if (atomic_dec_return(&wka_port->refcount) != 0) 126 return; 127 /* wait 10 milliseconds, other reqs might pop in */ 128 schedule_delayed_work(&wka_port->work, HZ / 100); 129} 130 131static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 132 struct zfcp_adapter *adapter) 133{ 134 init_waitqueue_head(&wka_port->completion_wq); 135 136 wka_port->adapter = adapter; 137 wka_port->d_id = d_id; 138 139 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 140 atomic_set(&wka_port->refcount, 0); 141 mutex_init(&wka_port->mutex); 142 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 143} 144 145static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 146{ 147 cancel_delayed_work_sync(&wka->work); 148 mutex_lock(&wka->mutex); 149 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 150 mutex_unlock(&wka->mutex); 151} 152 153void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 154{ 155 if (!gs) 156 return; 157 zfcp_fc_wka_port_force_offline(&gs->ms); 158 zfcp_fc_wka_port_force_offline(&gs->ts); 159 zfcp_fc_wka_port_force_offline(&gs->ds); 160 zfcp_fc_wka_port_force_offline(&gs->as); 161} 162 163static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 164 struct fc_els_rscn_page *page) 165{ 166 unsigned long flags; 167 struct zfcp_adapter *adapter = fsf_req->adapter; 168 struct zfcp_port *port; 169 170 read_lock_irqsave(&adapter->port_list_lock, flags); 171 list_for_each_entry(port, &adapter->port_list, list) { 172 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 173 zfcp_fc_test_link(port); 174 if (!port->d_id) 175 zfcp_erp_port_reopen(port, 176 ZFCP_STATUS_COMMON_ERP_FAILED, 177 "fcrscn1", NULL); 178 } 179 read_unlock_irqrestore(&adapter->port_list_lock, flags); 180} 181 182static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 183{ 184 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 185 struct fc_els_rscn *head; 186 struct fc_els_rscn_page *page; 187 u16 i; 188 u16 no_entries; 189 unsigned int afmt; 190 191 head = (struct fc_els_rscn *) status_buffer->payload.data; 192 page = (struct fc_els_rscn_page *) head; 193 194 /* see FC-FS */ 195 no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page); 196 197 for (i = 1; i < no_entries; i++) { 198 /* skip head and start with 1st element */ 199 page++; 200 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 201 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 202 page); 203 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 204 *(u32 *)page); 205 } 206 queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work); 207} 208 209static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 210{ 211 unsigned long flags; 212 struct zfcp_adapter *adapter = req->adapter; 213 struct zfcp_port *port; 214 215 read_lock_irqsave(&adapter->port_list_lock, flags); 216 list_for_each_entry(port, &adapter->port_list, list) 217 if (port->wwpn == wwpn) { 218 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req); 219 break; 220 } 221 read_unlock_irqrestore(&adapter->port_list_lock, flags); 222} 223 224static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 225{ 226 struct fsf_status_read_buffer *status_buffer; 227 struct fc_els_flogi *plogi; 228 229 status_buffer = (struct fsf_status_read_buffer *) req->data; 230 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 231 zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn); 232} 233 234static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 235{ 236 struct fsf_status_read_buffer *status_buffer = 237 (struct fsf_status_read_buffer *)req->data; 238 struct fc_els_logo *logo = 239 (struct fc_els_logo *) status_buffer->payload.data; 240 241 zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn); 242} 243 244/** 245 * zfcp_fc_incoming_els - handle incoming ELS 246 * @fsf_req - request which contains incoming ELS 247 */ 248void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 249{ 250 struct fsf_status_read_buffer *status_buffer = 251 (struct fsf_status_read_buffer *) fsf_req->data; 252 unsigned int els_type = status_buffer->payload.data[0]; 253 254 zfcp_dbf_san_incoming_els(fsf_req); 255 if (els_type == ELS_PLOGI) 256 zfcp_fc_incoming_plogi(fsf_req); 257 else if (els_type == ELS_LOGO) 258 zfcp_fc_incoming_logo(fsf_req); 259 else if (els_type == ELS_RSCN) 260 zfcp_fc_incoming_rscn(fsf_req); 261} 262 263static void zfcp_fc_ns_gid_pn_eval(void *data) 264{ 265 struct zfcp_fc_gid_pn *gid_pn = data; 266 struct zfcp_fsf_ct_els *ct = &gid_pn->ct; 267 struct zfcp_fc_gid_pn_req *gid_pn_req = sg_virt(ct->req); 268 struct zfcp_fc_gid_pn_resp *gid_pn_resp = sg_virt(ct->resp); 269 struct zfcp_port *port = gid_pn->port; 270 271 if (ct->status) 272 return; 273 if (gid_pn_resp->ct_hdr.ct_cmd != FC_FS_ACC) 274 return; 275 276 /* paranoia */ 277 if (gid_pn_req->gid_pn.fn_wwpn != port->wwpn) 278 return; 279 /* looks like a valid d_id */ 280 port->d_id = ntoh24(gid_pn_resp->gid_pn.fp_fid); 281} 282 283static void zfcp_fc_complete(void *data) 284{ 285 complete(data); 286} 287 288static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 289 struct zfcp_fc_gid_pn *gid_pn) 290{ 291 struct zfcp_adapter *adapter = port->adapter; 292 DECLARE_COMPLETION_ONSTACK(completion); 293 int ret; 294 295 /* setup parameters for send generic command */ 296 gid_pn->port = port; 297 gid_pn->ct.handler = zfcp_fc_complete; 298 gid_pn->ct.handler_data = &completion; 299 gid_pn->ct.req = &gid_pn->sg_req; 300 gid_pn->ct.resp = &gid_pn->sg_resp; 301 sg_init_one(&gid_pn->sg_req, &gid_pn->gid_pn_req, 302 sizeof(struct zfcp_fc_gid_pn_req)); 303 sg_init_one(&gid_pn->sg_resp, &gid_pn->gid_pn_resp, 304 sizeof(struct zfcp_fc_gid_pn_resp)); 305 306 /* setup nameserver request */ 307 gid_pn->gid_pn_req.ct_hdr.ct_rev = FC_CT_REV; 308 gid_pn->gid_pn_req.ct_hdr.ct_fs_type = FC_FST_DIR; 309 gid_pn->gid_pn_req.ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE; 310 gid_pn->gid_pn_req.ct_hdr.ct_options = 0; 311 gid_pn->gid_pn_req.ct_hdr.ct_cmd = FC_NS_GID_PN; 312 gid_pn->gid_pn_req.ct_hdr.ct_mr_size = ZFCP_FC_CT_SIZE_PAGE / 4; 313 gid_pn->gid_pn_req.gid_pn.fn_wwpn = port->wwpn; 314 315 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &gid_pn->ct, 316 adapter->pool.gid_pn_req, 317 ZFCP_FC_CTELS_TMO); 318 if (!ret) { 319 wait_for_completion(&completion); 320 zfcp_fc_ns_gid_pn_eval(gid_pn); 321 } 322 return ret; 323} 324 325/** 326 * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request 327 * @port: port where GID_PN request is needed 328 * return: -ENOMEM on error, 0 otherwise 329 */ 330static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 331{ 332 int ret; 333 struct zfcp_fc_gid_pn *gid_pn; 334 struct zfcp_adapter *adapter = port->adapter; 335 336 gid_pn = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 337 if (!gid_pn) 338 return -ENOMEM; 339 340 memset(gid_pn, 0, sizeof(*gid_pn)); 341 342 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 343 if (ret) 344 goto out; 345 346 ret = zfcp_fc_ns_gid_pn_request(port, gid_pn); 347 348 zfcp_fc_wka_port_put(&adapter->gs->ds); 349out: 350 mempool_free(gid_pn, adapter->pool.gid_pn); 351 return ret; 352} 353 354void zfcp_fc_port_did_lookup(struct work_struct *work) 355{ 356 int ret; 357 struct zfcp_port *port = container_of(work, struct zfcp_port, 358 gid_pn_work); 359 360 ret = zfcp_fc_ns_gid_pn(port); 361 if (ret) { 362 /* could not issue gid_pn for some reason */ 363 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1", NULL); 364 goto out; 365 } 366 367 if (!port->d_id) { 368 zfcp_erp_port_failed(port, "fcgpn_2", NULL); 369 goto out; 370 } 371 372 zfcp_erp_port_reopen(port, 0, "fcgpn_3", NULL); 373out: 374 put_device(&port->dev); 375} 376 377/** 378 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 379 * @port: The zfcp_port to lookup the d_id for. 380 */ 381void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 382{ 383 get_device(&port->dev); 384 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 385 put_device(&port->dev); 386} 387 388/** 389 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 390 * @port: zfcp_port structure 391 * @plogi: plogi payload 392 * 393 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 394 */ 395void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 396{ 397 if (plogi->fl_wwpn != port->wwpn) { 398 port->d_id = 0; 399 dev_warn(&port->adapter->ccw_device->dev, 400 "A port opened with WWPN 0x%016Lx returned data that " 401 "identifies it as WWPN 0x%016Lx\n", 402 (unsigned long long) port->wwpn, 403 (unsigned long long) plogi->fl_wwpn); 404 return; 405 } 406 407 port->wwnn = plogi->fl_wwnn; 408 port->maxframe_size = plogi->fl_csp.sp_bb_data; 409 410 if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID) 411 port->supported_classes |= FC_COS_CLASS1; 412 if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID) 413 port->supported_classes |= FC_COS_CLASS2; 414 if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID) 415 port->supported_classes |= FC_COS_CLASS3; 416 if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID) 417 port->supported_classes |= FC_COS_CLASS4; 418} 419 420static void zfcp_fc_adisc_handler(void *data) 421{ 422 struct zfcp_fc_els_adisc *adisc = data; 423 struct zfcp_port *port = adisc->els.port; 424 struct fc_els_adisc *adisc_resp = &adisc->adisc_resp; 425 426 if (adisc->els.status) { 427 /* request rejected or timed out */ 428 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 429 "fcadh_1", NULL); 430 goto out; 431 } 432 433 if (!port->wwnn) 434 port->wwnn = adisc_resp->adisc_wwnn; 435 436 if ((port->wwpn != adisc_resp->adisc_wwpn) || 437 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 438 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 439 "fcadh_2", NULL); 440 goto out; 441 } 442 443 /* port is good, unblock rport without going through erp */ 444 zfcp_scsi_schedule_rport_register(port); 445 out: 446 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 447 put_device(&port->dev); 448 kmem_cache_free(zfcp_data.adisc_cache, adisc); 449} 450 451static int zfcp_fc_adisc(struct zfcp_port *port) 452{ 453 struct zfcp_fc_els_adisc *adisc; 454 struct zfcp_adapter *adapter = port->adapter; 455 int ret; 456 457 adisc = kmem_cache_zalloc(zfcp_data.adisc_cache, GFP_ATOMIC); 458 if (!adisc) 459 return -ENOMEM; 460 461 adisc->els.port = port; 462 adisc->els.req = &adisc->req; 463 adisc->els.resp = &adisc->resp; 464 sg_init_one(adisc->els.req, &adisc->adisc_req, 465 sizeof(struct fc_els_adisc)); 466 sg_init_one(adisc->els.resp, &adisc->adisc_resp, 467 sizeof(struct fc_els_adisc)); 468 469 adisc->els.handler = zfcp_fc_adisc_handler; 470 adisc->els.handler_data = adisc; 471 472 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 473 without FC-AL-2 capability, so we don't set it */ 474 adisc->adisc_req.adisc_wwpn = fc_host_port_name(adapter->scsi_host); 475 adisc->adisc_req.adisc_wwnn = fc_host_node_name(adapter->scsi_host); 476 adisc->adisc_req.adisc_cmd = ELS_ADISC; 477 hton24(adisc->adisc_req.adisc_port_id, 478 fc_host_port_id(adapter->scsi_host)); 479 480 ret = zfcp_fsf_send_els(adapter, port->d_id, &adisc->els, 481 ZFCP_FC_CTELS_TMO); 482 if (ret) 483 kmem_cache_free(zfcp_data.adisc_cache, adisc); 484 485 return ret; 486} 487 488void zfcp_fc_link_test_work(struct work_struct *work) 489{ 490 struct zfcp_port *port = 491 container_of(work, struct zfcp_port, test_link_work); 492 int retval; 493 494 get_device(&port->dev); 495 port->rport_task = RPORT_DEL; 496 zfcp_scsi_rport_work(&port->rport_work); 497 498 /* only issue one test command at one time per port */ 499 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 500 goto out; 501 502 atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 503 504 retval = zfcp_fc_adisc(port); 505 if (retval == 0) 506 return; 507 508 /* send of ADISC was not possible */ 509 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 510 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL); 511 512out: 513 put_device(&port->dev); 514} 515 516/** 517 * zfcp_fc_test_link - lightweight link test procedure 518 * @port: port to be tested 519 * 520 * Test status of a link to a remote port using the ELS command ADISC. 521 * If there is a problem with the remote port, error recovery steps 522 * will be triggered. 523 */ 524void zfcp_fc_test_link(struct zfcp_port *port) 525{ 526 get_device(&port->dev); 527 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 528 put_device(&port->dev); 529} 530 531static void zfcp_free_sg_env(struct zfcp_fc_gpn_ft *gpn_ft, int buf_num) 532{ 533 struct scatterlist *sg = &gpn_ft->sg_req; 534 535 kmem_cache_free(zfcp_data.gpn_ft_cache, sg_virt(sg)); 536 zfcp_sg_free_table(gpn_ft->sg_resp, buf_num); 537 538 kfree(gpn_ft); 539} 540 541static struct zfcp_fc_gpn_ft *zfcp_alloc_sg_env(int buf_num) 542{ 543 struct zfcp_fc_gpn_ft *gpn_ft; 544 struct zfcp_fc_gpn_ft_req *req; 545 546 gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL); 547 if (!gpn_ft) 548 return NULL; 549 550 req = kmem_cache_zalloc(zfcp_data.gpn_ft_cache, GFP_KERNEL); 551 if (!req) { 552 kfree(gpn_ft); 553 gpn_ft = NULL; 554 goto out; 555 } 556 sg_init_one(&gpn_ft->sg_req, req, sizeof(*req)); 557 558 if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) { 559 zfcp_free_sg_env(gpn_ft, buf_num); 560 gpn_ft = NULL; 561 } 562out: 563 return gpn_ft; 564} 565 566 567static int zfcp_fc_send_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft, 568 struct zfcp_adapter *adapter, int max_bytes) 569{ 570 struct zfcp_fsf_ct_els *ct = &gpn_ft->ct; 571 struct zfcp_fc_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req); 572 DECLARE_COMPLETION_ONSTACK(completion); 573 int ret; 574 575 /* prepare CT IU for GPN_FT */ 576 req->ct_hdr.ct_rev = FC_CT_REV; 577 req->ct_hdr.ct_fs_type = FC_FST_DIR; 578 req->ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE; 579 req->ct_hdr.ct_options = 0; 580 req->ct_hdr.ct_cmd = FC_NS_GPN_FT; 581 req->ct_hdr.ct_mr_size = max_bytes / 4; 582 req->gpn_ft.fn_domain_id_scope = 0; 583 req->gpn_ft.fn_area_id_scope = 0; 584 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 585 586 /* prepare zfcp_send_ct */ 587 ct->handler = zfcp_fc_complete; 588 ct->handler_data = &completion; 589 ct->req = &gpn_ft->sg_req; 590 ct->resp = gpn_ft->sg_resp; 591 592 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct, NULL, 593 ZFCP_FC_CTELS_TMO); 594 if (!ret) 595 wait_for_completion(&completion); 596 return ret; 597} 598 599static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 600{ 601 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 602 return; 603 604 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); 605 606 if ((port->supported_classes != 0) || 607 !list_empty(&port->unit_list)) 608 return; 609 610 list_move_tail(&port->list, lh); 611} 612 613static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft, 614 struct zfcp_adapter *adapter, int max_entries) 615{ 616 struct zfcp_fsf_ct_els *ct = &gpn_ft->ct; 617 struct scatterlist *sg = gpn_ft->sg_resp; 618 struct fc_ct_hdr *hdr = sg_virt(sg); 619 struct fc_gpn_ft_resp *acc = sg_virt(sg); 620 struct zfcp_port *port, *tmp; 621 unsigned long flags; 622 LIST_HEAD(remove_lh); 623 u32 d_id; 624 int ret = 0, x, last = 0; 625 626 if (ct->status) 627 return -EIO; 628 629 if (hdr->ct_cmd != FC_FS_ACC) { 630 if (hdr->ct_reason == FC_BA_RJT_UNABLE) 631 return -EAGAIN; /* might be a temporary condition */ 632 return -EIO; 633 } 634 635 if (hdr->ct_mr_size) { 636 dev_warn(&adapter->ccw_device->dev, 637 "The name server reported %d words residual data\n", 638 hdr->ct_mr_size); 639 return -E2BIG; 640 } 641 642 /* first entry is the header */ 643 for (x = 1; x < max_entries && !last; x++) { 644 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 645 acc++; 646 else 647 acc = sg_virt(++sg); 648 649 last = acc->fp_flags & FC_NS_FID_LAST; 650 d_id = ntoh24(acc->fp_fid); 651 652 /* don't attach ports with a well known address */ 653 if (d_id >= FC_FID_WELL_KNOWN_BASE) 654 continue; 655 /* skip the adapter's port and known remote ports */ 656 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host)) 657 continue; 658 659 port = zfcp_port_enqueue(adapter, acc->fp_wwpn, 660 ZFCP_STATUS_COMMON_NOESC, d_id); 661 if (!IS_ERR(port)) 662 zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL); 663 else if (PTR_ERR(port) != -EEXIST) 664 ret = PTR_ERR(port); 665 } 666 667 zfcp_erp_wait(adapter); 668 write_lock_irqsave(&adapter->port_list_lock, flags); 669 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 670 zfcp_fc_validate_port(port, &remove_lh); 671 write_unlock_irqrestore(&adapter->port_list_lock, flags); 672 673 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 674 zfcp_erp_port_shutdown(port, 0, "fcegpf2", NULL); 675 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs); 676 } 677 678 return ret; 679} 680 681/** 682 * zfcp_fc_scan_ports - scan remote ports and attach new ports 683 * @work: reference to scheduled work 684 */ 685void zfcp_fc_scan_ports(struct work_struct *work) 686{ 687 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 688 scan_work); 689 int ret, i; 690 struct zfcp_fc_gpn_ft *gpn_ft; 691 int chain, max_entries, buf_num, max_bytes; 692 693 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 694 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 695 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 696 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 697 698 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 699 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 700 return; 701 702 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 703 return; 704 705 gpn_ft = zfcp_alloc_sg_env(buf_num); 706 if (!gpn_ft) 707 goto out; 708 709 for (i = 0; i < 3; i++) { 710 ret = zfcp_fc_send_gpn_ft(gpn_ft, adapter, max_bytes); 711 if (!ret) { 712 ret = zfcp_fc_eval_gpn_ft(gpn_ft, adapter, max_entries); 713 if (ret == -EAGAIN) 714 ssleep(1); 715 else 716 break; 717 } 718 } 719 zfcp_free_sg_env(gpn_ft, buf_num); 720out: 721 zfcp_fc_wka_port_put(&adapter->gs->ds); 722} 723 724static void zfcp_fc_ct_els_job_handler(void *data) 725{ 726 struct fc_bsg_job *job = data; 727 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 728 struct fc_bsg_reply *jr = job->reply; 729 730 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 731 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 732 jr->result = zfcp_ct_els->status ? -EIO : 0; 733 job->job_done(job); 734} 735 736static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job) 737{ 738 u32 preamble_word1; 739 u8 gs_type; 740 struct zfcp_adapter *adapter; 741 742 preamble_word1 = job->request->rqst_data.r_ct.preamble_word1; 743 gs_type = (preamble_word1 & 0xff000000) >> 24; 744 745 adapter = (struct zfcp_adapter *) job->shost->hostdata[0]; 746 747 switch (gs_type) { 748 case FC_FST_ALIAS: 749 return &adapter->gs->as; 750 case FC_FST_MGMT: 751 return &adapter->gs->ms; 752 case FC_FST_TIME: 753 return &adapter->gs->ts; 754 break; 755 case FC_FST_DIR: 756 return &adapter->gs->ds; 757 break; 758 default: 759 return NULL; 760 } 761} 762 763static void zfcp_fc_ct_job_handler(void *data) 764{ 765 struct fc_bsg_job *job = data; 766 struct zfcp_fc_wka_port *wka_port; 767 768 wka_port = zfcp_fc_job_wka_port(job); 769 zfcp_fc_wka_port_put(wka_port); 770 771 zfcp_fc_ct_els_job_handler(data); 772} 773 774static int zfcp_fc_exec_els_job(struct fc_bsg_job *job, 775 struct zfcp_adapter *adapter) 776{ 777 struct zfcp_fsf_ct_els *els = job->dd_data; 778 struct fc_rport *rport = job->rport; 779 struct zfcp_port *port; 780 u32 d_id; 781 782 if (rport) { 783 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 784 if (!port) 785 return -EINVAL; 786 787 d_id = port->d_id; 788 put_device(&port->dev); 789 } else 790 d_id = ntoh24(job->request->rqst_data.h_els.port_id); 791 792 els->handler = zfcp_fc_ct_els_job_handler; 793 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 794} 795 796static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job, 797 struct zfcp_adapter *adapter) 798{ 799 int ret; 800 struct zfcp_fsf_ct_els *ct = job->dd_data; 801 struct zfcp_fc_wka_port *wka_port; 802 803 wka_port = zfcp_fc_job_wka_port(job); 804 if (!wka_port) 805 return -EINVAL; 806 807 ret = zfcp_fc_wka_port_get(wka_port); 808 if (ret) 809 return ret; 810 811 ct->handler = zfcp_fc_ct_job_handler; 812 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 813 if (ret) 814 zfcp_fc_wka_port_put(wka_port); 815 816 return ret; 817} 818 819int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job) 820{ 821 struct Scsi_Host *shost; 822 struct zfcp_adapter *adapter; 823 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 824 825 shost = job->rport ? rport_to_shost(job->rport) : job->shost; 826 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 827 828 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 829 return -EINVAL; 830 831 ct_els->req = job->request_payload.sg_list; 832 ct_els->resp = job->reply_payload.sg_list; 833 ct_els->handler_data = job; 834 835 switch (job->request->msgcode) { 836 case FC_BSG_RPT_ELS: 837 case FC_BSG_HST_ELS_NOLOGIN: 838 return zfcp_fc_exec_els_job(job, adapter); 839 case FC_BSG_RPT_CT: 840 case FC_BSG_HST_CT: 841 return zfcp_fc_exec_ct_job(job, adapter); 842 default: 843 return -EINVAL; 844 } 845} 846 847int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job) 848{ 849 /* hardware tracks timeout, reset bsg timeout to not interfere */ 850 return -EAGAIN; 851} 852 853int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 854{ 855 struct zfcp_fc_wka_ports *wka_ports; 856 857 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 858 if (!wka_ports) 859 return -ENOMEM; 860 861 adapter->gs = wka_ports; 862 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 863 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 864 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 865 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 866 867 return 0; 868} 869 870void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 871{ 872 kfree(adapter->gs); 873 adapter->gs = NULL; 874} 875