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 <linux/random.h> 16 #include <scsi/fc/fc_els.h> 17 #include <scsi/libfc.h> 18 #include "zfcp_ext.h" 19 #include "zfcp_fc.h" 20 21 struct kmem_cache *zfcp_fc_req_cache; 22 23 static u32 zfcp_fc_rscn_range_mask[] = { 24 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 25 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 26 [ELS_ADDR_FMT_DOM] = 0xFF0000, 27 [ELS_ADDR_FMT_FAB] = 0x000000, 28 }; 29 30 static bool no_auto_port_rescan; 31 module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600); 32 MODULE_PARM_DESC(no_auto_port_rescan, 33 "no automatic port_rescan (default off)"); 34 35 static unsigned int port_scan_backoff = 500; 36 module_param(port_scan_backoff, uint, 0600); 37 MODULE_PARM_DESC(port_scan_backoff, 38 "upper limit of port scan random backoff in msecs (default 500)"); 39 40 static unsigned int port_scan_ratelimit = 60000; 41 module_param(port_scan_ratelimit, uint, 0600); 42 MODULE_PARM_DESC(port_scan_ratelimit, 43 "minimum interval between port scans in msecs (default 60000)"); 44 45 unsigned int zfcp_fc_port_scan_backoff(void) 46 { 47 if (!port_scan_backoff) 48 return 0; 49 return get_random_int() % port_scan_backoff; 50 } 51 52 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) 53 { 54 unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); 55 unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); 56 57 adapter->next_port_scan = jiffies + interval + backoff; 58 } 59 60 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) 61 { 62 unsigned long now = jiffies; 63 unsigned long next = adapter->next_port_scan; 64 unsigned long delay = 0, max; 65 66 /* delay only needed within waiting period */ 67 if (time_before(now, next)) { 68 delay = next - now; 69 /* paranoia: never ever delay scans longer than specified */ 70 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); 71 delay = min(delay, max); 72 } 73 74 queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); 75 } 76 77 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) 78 { 79 if (no_auto_port_rescan) 80 return; 81 82 zfcp_fc_port_scan(adapter); 83 } 84 85 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) 86 { 87 if (!no_auto_port_rescan) 88 return; 89 90 zfcp_fc_port_scan(adapter); 91 } 92 93 /** 94 * zfcp_fc_post_event - post event to userspace via fc_transport 95 * @work: work struct with enqueued events 96 */ 97 void zfcp_fc_post_event(struct work_struct *work) 98 { 99 struct zfcp_fc_event *event = NULL, *tmp = NULL; 100 LIST_HEAD(tmp_lh); 101 struct zfcp_fc_events *events = container_of(work, 102 struct zfcp_fc_events, work); 103 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 104 events); 105 106 spin_lock_bh(&events->list_lock); 107 list_splice_init(&events->list, &tmp_lh); 108 spin_unlock_bh(&events->list_lock); 109 110 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 111 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 112 event->code, event->data); 113 list_del(&event->list); 114 kfree(event); 115 } 116 117 } 118 119 /** 120 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 121 * @adapter: The adapter where to enqueue the event 122 * @event_code: The event code (as defined in fc_host_event_code in 123 * scsi_transport_fc.h) 124 * @event_data: The event data (e.g. n_port page in case of els) 125 */ 126 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 127 enum fc_host_event_code event_code, u32 event_data) 128 { 129 struct zfcp_fc_event *event; 130 131 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 132 if (!event) 133 return; 134 135 event->code = event_code; 136 event->data = event_data; 137 138 spin_lock(&adapter->events.list_lock); 139 list_add_tail(&event->list, &adapter->events.list); 140 spin_unlock(&adapter->events.list_lock); 141 142 queue_work(adapter->work_queue, &adapter->events.work); 143 } 144 145 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 146 { 147 if (mutex_lock_interruptible(&wka_port->mutex)) 148 return -ERESTARTSYS; 149 150 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 151 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 152 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 153 if (zfcp_fsf_open_wka_port(wka_port)) 154 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 155 } 156 157 mutex_unlock(&wka_port->mutex); 158 159 wait_event(wka_port->completion_wq, 160 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 161 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 162 163 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 164 atomic_inc(&wka_port->refcount); 165 return 0; 166 } 167 return -EIO; 168 } 169 170 static void zfcp_fc_wka_port_offline(struct work_struct *work) 171 { 172 struct delayed_work *dw = to_delayed_work(work); 173 struct zfcp_fc_wka_port *wka_port = 174 container_of(dw, struct zfcp_fc_wka_port, work); 175 176 mutex_lock(&wka_port->mutex); 177 if ((atomic_read(&wka_port->refcount) != 0) || 178 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 179 goto out; 180 181 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 182 if (zfcp_fsf_close_wka_port(wka_port)) { 183 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 184 wake_up(&wka_port->completion_wq); 185 } 186 out: 187 mutex_unlock(&wka_port->mutex); 188 } 189 190 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 191 { 192 if (atomic_dec_return(&wka_port->refcount) != 0) 193 return; 194 /* wait 10 milliseconds, other reqs might pop in */ 195 schedule_delayed_work(&wka_port->work, HZ / 100); 196 } 197 198 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 199 struct zfcp_adapter *adapter) 200 { 201 init_waitqueue_head(&wka_port->completion_wq); 202 203 wka_port->adapter = adapter; 204 wka_port->d_id = d_id; 205 206 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 207 atomic_set(&wka_port->refcount, 0); 208 mutex_init(&wka_port->mutex); 209 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 210 } 211 212 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 213 { 214 cancel_delayed_work_sync(&wka->work); 215 mutex_lock(&wka->mutex); 216 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 217 mutex_unlock(&wka->mutex); 218 } 219 220 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 221 { 222 if (!gs) 223 return; 224 zfcp_fc_wka_port_force_offline(&gs->ms); 225 zfcp_fc_wka_port_force_offline(&gs->ts); 226 zfcp_fc_wka_port_force_offline(&gs->ds); 227 zfcp_fc_wka_port_force_offline(&gs->as); 228 } 229 230 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 231 struct fc_els_rscn_page *page) 232 { 233 unsigned long flags; 234 struct zfcp_adapter *adapter = fsf_req->adapter; 235 struct zfcp_port *port; 236 237 read_lock_irqsave(&adapter->port_list_lock, flags); 238 list_for_each_entry(port, &adapter->port_list, list) { 239 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 240 zfcp_fc_test_link(port); 241 if (!port->d_id) 242 zfcp_erp_port_reopen(port, 243 ZFCP_STATUS_COMMON_ERP_FAILED, 244 "fcrscn1"); 245 } 246 read_unlock_irqrestore(&adapter->port_list_lock, flags); 247 } 248 249 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 250 { 251 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 252 struct fc_els_rscn *head; 253 struct fc_els_rscn_page *page; 254 u16 i; 255 u16 no_entries; 256 unsigned int afmt; 257 258 head = (struct fc_els_rscn *) status_buffer->payload.data; 259 page = (struct fc_els_rscn_page *) head; 260 261 /* see FC-FS */ 262 no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page); 263 264 for (i = 1; i < no_entries; i++) { 265 /* skip head and start with 1st element */ 266 page++; 267 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 268 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 269 page); 270 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 271 *(u32 *)page); 272 } 273 zfcp_fc_conditional_port_scan(fsf_req->adapter); 274 } 275 276 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 277 { 278 unsigned long flags; 279 struct zfcp_adapter *adapter = req->adapter; 280 struct zfcp_port *port; 281 282 read_lock_irqsave(&adapter->port_list_lock, flags); 283 list_for_each_entry(port, &adapter->port_list, list) 284 if (port->wwpn == wwpn) { 285 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 286 break; 287 } 288 read_unlock_irqrestore(&adapter->port_list_lock, flags); 289 } 290 291 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 292 { 293 struct fsf_status_read_buffer *status_buffer; 294 struct fc_els_flogi *plogi; 295 296 status_buffer = (struct fsf_status_read_buffer *) req->data; 297 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 298 zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn); 299 } 300 301 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 302 { 303 struct fsf_status_read_buffer *status_buffer = 304 (struct fsf_status_read_buffer *)req->data; 305 struct fc_els_logo *logo = 306 (struct fc_els_logo *) status_buffer->payload.data; 307 308 zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn); 309 } 310 311 /** 312 * zfcp_fc_incoming_els - handle incoming ELS 313 * @fsf_req - request which contains incoming ELS 314 */ 315 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 316 { 317 struct fsf_status_read_buffer *status_buffer = 318 (struct fsf_status_read_buffer *) fsf_req->data; 319 unsigned int els_type = status_buffer->payload.data[0]; 320 321 zfcp_dbf_san_in_els("fciels1", fsf_req); 322 if (els_type == ELS_PLOGI) 323 zfcp_fc_incoming_plogi(fsf_req); 324 else if (els_type == ELS_LOGO) 325 zfcp_fc_incoming_logo(fsf_req); 326 else if (els_type == ELS_RSCN) 327 zfcp_fc_incoming_rscn(fsf_req); 328 } 329 330 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 331 { 332 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 333 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 334 335 if (ct_els->status) 336 return; 337 if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC) 338 return; 339 340 /* looks like a valid d_id */ 341 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 342 } 343 344 static void zfcp_fc_complete(void *data) 345 { 346 complete(data); 347 } 348 349 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 350 { 351 ct_hdr->ct_rev = FC_CT_REV; 352 ct_hdr->ct_fs_type = FC_FST_DIR; 353 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 354 ct_hdr->ct_cmd = cmd; 355 ct_hdr->ct_mr_size = mr_size / 4; 356 } 357 358 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 359 struct zfcp_fc_req *fc_req) 360 { 361 struct zfcp_adapter *adapter = port->adapter; 362 DECLARE_COMPLETION_ONSTACK(completion); 363 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 364 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 365 int ret; 366 367 /* setup parameters for send generic command */ 368 fc_req->ct_els.port = port; 369 fc_req->ct_els.handler = zfcp_fc_complete; 370 fc_req->ct_els.handler_data = &completion; 371 fc_req->ct_els.req = &fc_req->sg_req; 372 fc_req->ct_els.resp = &fc_req->sg_rsp; 373 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 374 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 375 376 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 377 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 378 gid_pn_req->gid_pn.fn_wwpn = port->wwpn; 379 380 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 381 adapter->pool.gid_pn_req, 382 ZFCP_FC_CTELS_TMO); 383 if (!ret) { 384 wait_for_completion(&completion); 385 zfcp_fc_ns_gid_pn_eval(fc_req); 386 } 387 return ret; 388 } 389 390 /** 391 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 392 * @port: port where GID_PN request is needed 393 * return: -ENOMEM on error, 0 otherwise 394 */ 395 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 396 { 397 int ret; 398 struct zfcp_fc_req *fc_req; 399 struct zfcp_adapter *adapter = port->adapter; 400 401 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 402 if (!fc_req) 403 return -ENOMEM; 404 405 memset(fc_req, 0, sizeof(*fc_req)); 406 407 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 408 if (ret) 409 goto out; 410 411 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 412 413 zfcp_fc_wka_port_put(&adapter->gs->ds); 414 out: 415 mempool_free(fc_req, adapter->pool.gid_pn); 416 return ret; 417 } 418 419 void zfcp_fc_port_did_lookup(struct work_struct *work) 420 { 421 int ret; 422 struct zfcp_port *port = container_of(work, struct zfcp_port, 423 gid_pn_work); 424 425 ret = zfcp_fc_ns_gid_pn(port); 426 if (ret) { 427 /* could not issue gid_pn for some reason */ 428 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 429 goto out; 430 } 431 432 if (!port->d_id) { 433 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 434 goto out; 435 } 436 437 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 438 out: 439 put_device(&port->dev); 440 } 441 442 /** 443 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 444 * @port: The zfcp_port to lookup the d_id for. 445 */ 446 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 447 { 448 get_device(&port->dev); 449 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 450 put_device(&port->dev); 451 } 452 453 /** 454 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 455 * @port: zfcp_port structure 456 * @plogi: plogi payload 457 * 458 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 459 */ 460 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 461 { 462 if (plogi->fl_wwpn != port->wwpn) { 463 port->d_id = 0; 464 dev_warn(&port->adapter->ccw_device->dev, 465 "A port opened with WWPN 0x%016Lx returned data that " 466 "identifies it as WWPN 0x%016Lx\n", 467 (unsigned long long) port->wwpn, 468 (unsigned long long) plogi->fl_wwpn); 469 return; 470 } 471 472 port->wwnn = plogi->fl_wwnn; 473 port->maxframe_size = plogi->fl_csp.sp_bb_data; 474 475 if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID) 476 port->supported_classes |= FC_COS_CLASS1; 477 if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID) 478 port->supported_classes |= FC_COS_CLASS2; 479 if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID) 480 port->supported_classes |= FC_COS_CLASS3; 481 if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID) 482 port->supported_classes |= FC_COS_CLASS4; 483 } 484 485 static void zfcp_fc_adisc_handler(void *data) 486 { 487 struct zfcp_fc_req *fc_req = data; 488 struct zfcp_port *port = fc_req->ct_els.port; 489 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 490 491 if (fc_req->ct_els.status) { 492 /* request rejected or timed out */ 493 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 494 "fcadh_1"); 495 goto out; 496 } 497 498 if (!port->wwnn) 499 port->wwnn = adisc_resp->adisc_wwnn; 500 501 if ((port->wwpn != adisc_resp->adisc_wwpn) || 502 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 503 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 504 "fcadh_2"); 505 goto out; 506 } 507 508 /* port is good, unblock rport without going through erp */ 509 zfcp_scsi_schedule_rport_register(port); 510 out: 511 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 512 put_device(&port->dev); 513 kmem_cache_free(zfcp_fc_req_cache, fc_req); 514 } 515 516 static int zfcp_fc_adisc(struct zfcp_port *port) 517 { 518 struct zfcp_fc_req *fc_req; 519 struct zfcp_adapter *adapter = port->adapter; 520 struct Scsi_Host *shost = adapter->scsi_host; 521 int ret; 522 523 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 524 if (!fc_req) 525 return -ENOMEM; 526 527 fc_req->ct_els.port = port; 528 fc_req->ct_els.req = &fc_req->sg_req; 529 fc_req->ct_els.resp = &fc_req->sg_rsp; 530 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 531 sizeof(struct fc_els_adisc)); 532 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 533 sizeof(struct fc_els_adisc)); 534 535 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 536 fc_req->ct_els.handler_data = fc_req; 537 538 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 539 without FC-AL-2 capability, so we don't set it */ 540 fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost); 541 fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost); 542 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 543 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 544 545 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, 546 ZFCP_FC_CTELS_TMO); 547 if (ret) 548 kmem_cache_free(zfcp_fc_req_cache, fc_req); 549 550 return ret; 551 } 552 553 void zfcp_fc_link_test_work(struct work_struct *work) 554 { 555 struct zfcp_port *port = 556 container_of(work, struct zfcp_port, test_link_work); 557 int retval; 558 559 get_device(&port->dev); 560 port->rport_task = RPORT_DEL; 561 zfcp_scsi_rport_work(&port->rport_work); 562 563 /* only issue one test command at one time per port */ 564 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 565 goto out; 566 567 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 568 569 retval = zfcp_fc_adisc(port); 570 if (retval == 0) 571 return; 572 573 /* send of ADISC was not possible */ 574 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 575 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 576 577 out: 578 put_device(&port->dev); 579 } 580 581 /** 582 * zfcp_fc_test_link - lightweight link test procedure 583 * @port: port to be tested 584 * 585 * Test status of a link to a remote port using the ELS command ADISC. 586 * If there is a problem with the remote port, error recovery steps 587 * will be triggered. 588 */ 589 void zfcp_fc_test_link(struct zfcp_port *port) 590 { 591 get_device(&port->dev); 592 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 593 put_device(&port->dev); 594 } 595 596 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) 597 { 598 struct zfcp_fc_req *fc_req; 599 600 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 601 if (!fc_req) 602 return NULL; 603 604 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 605 kmem_cache_free(zfcp_fc_req_cache, fc_req); 606 return NULL; 607 } 608 609 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 610 sizeof(struct zfcp_fc_gpn_ft_req)); 611 612 return fc_req; 613 } 614 615 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 616 struct zfcp_adapter *adapter, int max_bytes) 617 { 618 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 619 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 620 DECLARE_COMPLETION_ONSTACK(completion); 621 int ret; 622 623 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 624 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 625 626 ct_els->handler = zfcp_fc_complete; 627 ct_els->handler_data = &completion; 628 ct_els->req = &fc_req->sg_req; 629 ct_els->resp = &fc_req->sg_rsp; 630 631 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 632 ZFCP_FC_CTELS_TMO); 633 if (!ret) 634 wait_for_completion(&completion); 635 return ret; 636 } 637 638 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 639 { 640 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 641 return; 642 643 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 644 645 if ((port->supported_classes != 0) || 646 !list_empty(&port->unit_list)) 647 return; 648 649 list_move_tail(&port->list, lh); 650 } 651 652 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 653 struct zfcp_adapter *adapter, int max_entries) 654 { 655 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 656 struct scatterlist *sg = &fc_req->sg_rsp; 657 struct fc_ct_hdr *hdr = sg_virt(sg); 658 struct fc_gpn_ft_resp *acc = sg_virt(sg); 659 struct zfcp_port *port, *tmp; 660 unsigned long flags; 661 LIST_HEAD(remove_lh); 662 u32 d_id; 663 int ret = 0, x, last = 0; 664 665 if (ct_els->status) 666 return -EIO; 667 668 if (hdr->ct_cmd != FC_FS_ACC) { 669 if (hdr->ct_reason == FC_BA_RJT_UNABLE) 670 return -EAGAIN; /* might be a temporary condition */ 671 return -EIO; 672 } 673 674 if (hdr->ct_mr_size) { 675 dev_warn(&adapter->ccw_device->dev, 676 "The name server reported %d words residual data\n", 677 hdr->ct_mr_size); 678 return -E2BIG; 679 } 680 681 /* first entry is the header */ 682 for (x = 1; x < max_entries && !last; x++) { 683 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 684 acc++; 685 else 686 acc = sg_virt(++sg); 687 688 last = acc->fp_flags & FC_NS_FID_LAST; 689 d_id = ntoh24(acc->fp_fid); 690 691 /* don't attach ports with a well known address */ 692 if (d_id >= FC_FID_WELL_KNOWN_BASE) 693 continue; 694 /* skip the adapter's port and known remote ports */ 695 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host)) 696 continue; 697 698 port = zfcp_port_enqueue(adapter, acc->fp_wwpn, 699 ZFCP_STATUS_COMMON_NOESC, d_id); 700 if (!IS_ERR(port)) 701 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 702 else if (PTR_ERR(port) != -EEXIST) 703 ret = PTR_ERR(port); 704 } 705 706 zfcp_erp_wait(adapter); 707 write_lock_irqsave(&adapter->port_list_lock, flags); 708 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 709 zfcp_fc_validate_port(port, &remove_lh); 710 write_unlock_irqrestore(&adapter->port_list_lock, flags); 711 712 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 713 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 714 device_unregister(&port->dev); 715 } 716 717 return ret; 718 } 719 720 /** 721 * zfcp_fc_scan_ports - scan remote ports and attach new ports 722 * @work: reference to scheduled work 723 */ 724 void zfcp_fc_scan_ports(struct work_struct *work) 725 { 726 struct delayed_work *dw = to_delayed_work(work); 727 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 728 scan_work); 729 int ret, i; 730 struct zfcp_fc_req *fc_req; 731 int chain, max_entries, buf_num, max_bytes; 732 733 zfcp_fc_port_scan_time(adapter); 734 735 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 736 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 737 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 738 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 739 740 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 741 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 742 return; 743 744 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 745 return; 746 747 fc_req = zfcp_alloc_sg_env(buf_num); 748 if (!fc_req) 749 goto out; 750 751 for (i = 0; i < 3; i++) { 752 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 753 if (!ret) { 754 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 755 if (ret == -EAGAIN) 756 ssleep(1); 757 else 758 break; 759 } 760 } 761 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); 762 kmem_cache_free(zfcp_fc_req_cache, fc_req); 763 out: 764 zfcp_fc_wka_port_put(&adapter->gs->ds); 765 } 766 767 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 768 struct zfcp_fc_req *fc_req) 769 { 770 DECLARE_COMPLETION_ONSTACK(completion); 771 char devno[] = "DEVNO:"; 772 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 773 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 774 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 775 int ret; 776 777 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 778 FC_SYMBOLIC_NAME_SIZE); 779 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 780 781 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 782 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 783 784 ct_els->handler = zfcp_fc_complete; 785 ct_els->handler_data = &completion; 786 ct_els->req = &fc_req->sg_req; 787 ct_els->resp = &fc_req->sg_rsp; 788 789 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 790 ZFCP_FC_CTELS_TMO); 791 if (ret) 792 return ret; 793 794 wait_for_completion(&completion); 795 if (ct_els->status) 796 return ct_els->status; 797 798 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 799 !(strstr(gspn_rsp->gspn.fp_name, devno))) 800 snprintf(fc_host_symbolic_name(adapter->scsi_host), 801 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 802 gspn_rsp->gspn.fp_name, devno, 803 dev_name(&adapter->ccw_device->dev), 804 init_utsname()->nodename); 805 else 806 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 807 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 808 809 return 0; 810 } 811 812 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 813 struct zfcp_fc_req *fc_req) 814 { 815 DECLARE_COMPLETION_ONSTACK(completion); 816 struct Scsi_Host *shost = adapter->scsi_host; 817 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 818 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 819 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 820 int ret, len; 821 822 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 823 FC_SYMBOLIC_NAME_SIZE); 824 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 825 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 826 FC_SYMBOLIC_NAME_SIZE); 827 rspn_req->rspn.fr_name_len = len; 828 829 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 830 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 831 832 ct_els->handler = zfcp_fc_complete; 833 ct_els->handler_data = &completion; 834 ct_els->req = &fc_req->sg_req; 835 ct_els->resp = &fc_req->sg_rsp; 836 837 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 838 ZFCP_FC_CTELS_TMO); 839 if (!ret) 840 wait_for_completion(&completion); 841 } 842 843 /** 844 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 845 * @work: ns_up_work of the adapter where to update the symbolic port name 846 * 847 * Retrieve the current symbolic port name that may have been set by 848 * the hardware using the GSPN request and update the fc_host 849 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 850 * the port name is unique for this system), update the symbolic port 851 * name to add Linux specific information and update the FC nameserver 852 * using the RSPN request. 853 */ 854 void zfcp_fc_sym_name_update(struct work_struct *work) 855 { 856 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 857 ns_up_work); 858 int ret; 859 struct zfcp_fc_req *fc_req; 860 861 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 862 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 863 return; 864 865 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 866 if (!fc_req) 867 return; 868 869 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 870 if (ret) 871 goto out_free; 872 873 ret = zfcp_fc_gspn(adapter, fc_req); 874 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 875 goto out_ds_put; 876 877 memset(fc_req, 0, sizeof(*fc_req)); 878 zfcp_fc_rspn(adapter, fc_req); 879 880 out_ds_put: 881 zfcp_fc_wka_port_put(&adapter->gs->ds); 882 out_free: 883 kmem_cache_free(zfcp_fc_req_cache, fc_req); 884 } 885 886 static void zfcp_fc_ct_els_job_handler(void *data) 887 { 888 struct fc_bsg_job *job = data; 889 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 890 struct fc_bsg_reply *jr = job->reply; 891 892 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 893 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 894 jr->result = zfcp_ct_els->status ? -EIO : 0; 895 job->job_done(job); 896 } 897 898 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job) 899 { 900 u32 preamble_word1; 901 u8 gs_type; 902 struct zfcp_adapter *adapter; 903 904 preamble_word1 = job->request->rqst_data.r_ct.preamble_word1; 905 gs_type = (preamble_word1 & 0xff000000) >> 24; 906 907 adapter = (struct zfcp_adapter *) job->shost->hostdata[0]; 908 909 switch (gs_type) { 910 case FC_FST_ALIAS: 911 return &adapter->gs->as; 912 case FC_FST_MGMT: 913 return &adapter->gs->ms; 914 case FC_FST_TIME: 915 return &adapter->gs->ts; 916 break; 917 case FC_FST_DIR: 918 return &adapter->gs->ds; 919 break; 920 default: 921 return NULL; 922 } 923 } 924 925 static void zfcp_fc_ct_job_handler(void *data) 926 { 927 struct fc_bsg_job *job = data; 928 struct zfcp_fc_wka_port *wka_port; 929 930 wka_port = zfcp_fc_job_wka_port(job); 931 zfcp_fc_wka_port_put(wka_port); 932 933 zfcp_fc_ct_els_job_handler(data); 934 } 935 936 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job, 937 struct zfcp_adapter *adapter) 938 { 939 struct zfcp_fsf_ct_els *els = job->dd_data; 940 struct fc_rport *rport = job->rport; 941 struct zfcp_port *port; 942 u32 d_id; 943 944 if (rport) { 945 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 946 if (!port) 947 return -EINVAL; 948 949 d_id = port->d_id; 950 put_device(&port->dev); 951 } else 952 d_id = ntoh24(job->request->rqst_data.h_els.port_id); 953 954 els->handler = zfcp_fc_ct_els_job_handler; 955 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 956 } 957 958 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job, 959 struct zfcp_adapter *adapter) 960 { 961 int ret; 962 struct zfcp_fsf_ct_els *ct = job->dd_data; 963 struct zfcp_fc_wka_port *wka_port; 964 965 wka_port = zfcp_fc_job_wka_port(job); 966 if (!wka_port) 967 return -EINVAL; 968 969 ret = zfcp_fc_wka_port_get(wka_port); 970 if (ret) 971 return ret; 972 973 ct->handler = zfcp_fc_ct_job_handler; 974 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 975 if (ret) 976 zfcp_fc_wka_port_put(wka_port); 977 978 return ret; 979 } 980 981 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job) 982 { 983 struct Scsi_Host *shost; 984 struct zfcp_adapter *adapter; 985 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 986 987 shost = job->rport ? rport_to_shost(job->rport) : job->shost; 988 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 989 990 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 991 return -EINVAL; 992 993 ct_els->req = job->request_payload.sg_list; 994 ct_els->resp = job->reply_payload.sg_list; 995 ct_els->handler_data = job; 996 997 switch (job->request->msgcode) { 998 case FC_BSG_RPT_ELS: 999 case FC_BSG_HST_ELS_NOLOGIN: 1000 return zfcp_fc_exec_els_job(job, adapter); 1001 case FC_BSG_RPT_CT: 1002 case FC_BSG_HST_CT: 1003 return zfcp_fc_exec_ct_job(job, adapter); 1004 default: 1005 return -EINVAL; 1006 } 1007 } 1008 1009 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job) 1010 { 1011 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1012 return -EAGAIN; 1013 } 1014 1015 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1016 { 1017 struct zfcp_fc_wka_ports *wka_ports; 1018 1019 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1020 if (!wka_ports) 1021 return -ENOMEM; 1022 1023 adapter->gs = wka_ports; 1024 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1025 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1026 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1027 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1028 1029 return 0; 1030 } 1031 1032 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1033 { 1034 kfree(adapter->gs); 1035 adapter->gs = NULL; 1036 } 1037 1038