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 <linux/bsg-lib.h> 17 #include <scsi/fc/fc_els.h> 18 #include <scsi/libfc.h> 19 #include "zfcp_ext.h" 20 #include "zfcp_fc.h" 21 22 struct kmem_cache *zfcp_fc_req_cache; 23 24 static u32 zfcp_fc_rscn_range_mask[] = { 25 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 26 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 27 [ELS_ADDR_FMT_DOM] = 0xFF0000, 28 [ELS_ADDR_FMT_FAB] = 0x000000, 29 }; 30 31 static bool no_auto_port_rescan; 32 module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600); 33 MODULE_PARM_DESC(no_auto_port_rescan, 34 "no automatic port_rescan (default off)"); 35 36 static unsigned int port_scan_backoff = 500; 37 module_param(port_scan_backoff, uint, 0600); 38 MODULE_PARM_DESC(port_scan_backoff, 39 "upper limit of port scan random backoff in msecs (default 500)"); 40 41 static unsigned int port_scan_ratelimit = 60000; 42 module_param(port_scan_ratelimit, uint, 0600); 43 MODULE_PARM_DESC(port_scan_ratelimit, 44 "minimum interval between port scans in msecs (default 60000)"); 45 46 unsigned int zfcp_fc_port_scan_backoff(void) 47 { 48 if (!port_scan_backoff) 49 return 0; 50 return get_random_int() % port_scan_backoff; 51 } 52 53 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) 54 { 55 unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); 56 unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); 57 58 adapter->next_port_scan = jiffies + interval + backoff; 59 } 60 61 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) 62 { 63 unsigned long now = jiffies; 64 unsigned long next = adapter->next_port_scan; 65 unsigned long delay = 0, max; 66 67 /* delay only needed within waiting period */ 68 if (time_before(now, next)) { 69 delay = next - now; 70 /* paranoia: never ever delay scans longer than specified */ 71 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); 72 delay = min(delay, max); 73 } 74 75 queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); 76 } 77 78 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) 79 { 80 if (no_auto_port_rescan) 81 return; 82 83 zfcp_fc_port_scan(adapter); 84 } 85 86 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) 87 { 88 if (!no_auto_port_rescan) 89 return; 90 91 zfcp_fc_port_scan(adapter); 92 } 93 94 /** 95 * zfcp_fc_post_event - post event to userspace via fc_transport 96 * @work: work struct with enqueued events 97 */ 98 void zfcp_fc_post_event(struct work_struct *work) 99 { 100 struct zfcp_fc_event *event = NULL, *tmp = NULL; 101 LIST_HEAD(tmp_lh); 102 struct zfcp_fc_events *events = container_of(work, 103 struct zfcp_fc_events, work); 104 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 105 events); 106 107 spin_lock_bh(&events->list_lock); 108 list_splice_init(&events->list, &tmp_lh); 109 spin_unlock_bh(&events->list_lock); 110 111 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 112 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 113 event->code, event->data); 114 list_del(&event->list); 115 kfree(event); 116 } 117 118 } 119 120 /** 121 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 122 * @adapter: The adapter where to enqueue the event 123 * @event_code: The event code (as defined in fc_host_event_code in 124 * scsi_transport_fc.h) 125 * @event_data: The event data (e.g. n_port page in case of els) 126 */ 127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 128 enum fc_host_event_code event_code, u32 event_data) 129 { 130 struct zfcp_fc_event *event; 131 132 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 133 if (!event) 134 return; 135 136 event->code = event_code; 137 event->data = event_data; 138 139 spin_lock(&adapter->events.list_lock); 140 list_add_tail(&event->list, &adapter->events.list); 141 spin_unlock(&adapter->events.list_lock); 142 143 queue_work(adapter->work_queue, &adapter->events.work); 144 } 145 146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 147 { 148 if (mutex_lock_interruptible(&wka_port->mutex)) 149 return -ERESTARTSYS; 150 151 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 152 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 153 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 154 if (zfcp_fsf_open_wka_port(wka_port)) 155 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 156 } 157 158 mutex_unlock(&wka_port->mutex); 159 160 wait_event(wka_port->completion_wq, 161 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 162 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 163 164 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 165 atomic_inc(&wka_port->refcount); 166 return 0; 167 } 168 return -EIO; 169 } 170 171 static void zfcp_fc_wka_port_offline(struct work_struct *work) 172 { 173 struct delayed_work *dw = to_delayed_work(work); 174 struct zfcp_fc_wka_port *wka_port = 175 container_of(dw, struct zfcp_fc_wka_port, work); 176 177 mutex_lock(&wka_port->mutex); 178 if ((atomic_read(&wka_port->refcount) != 0) || 179 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 180 goto out; 181 182 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 183 if (zfcp_fsf_close_wka_port(wka_port)) { 184 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 185 wake_up(&wka_port->completion_wq); 186 } 187 out: 188 mutex_unlock(&wka_port->mutex); 189 } 190 191 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 192 { 193 if (atomic_dec_return(&wka_port->refcount) != 0) 194 return; 195 /* wait 10 milliseconds, other reqs might pop in */ 196 schedule_delayed_work(&wka_port->work, HZ / 100); 197 } 198 199 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 200 struct zfcp_adapter *adapter) 201 { 202 init_waitqueue_head(&wka_port->completion_wq); 203 204 wka_port->adapter = adapter; 205 wka_port->d_id = d_id; 206 207 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 208 atomic_set(&wka_port->refcount, 0); 209 mutex_init(&wka_port->mutex); 210 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 211 } 212 213 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 214 { 215 cancel_delayed_work_sync(&wka->work); 216 mutex_lock(&wka->mutex); 217 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 218 mutex_unlock(&wka->mutex); 219 } 220 221 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 222 { 223 if (!gs) 224 return; 225 zfcp_fc_wka_port_force_offline(&gs->ms); 226 zfcp_fc_wka_port_force_offline(&gs->ts); 227 zfcp_fc_wka_port_force_offline(&gs->ds); 228 zfcp_fc_wka_port_force_offline(&gs->as); 229 } 230 231 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 232 struct fc_els_rscn_page *page) 233 { 234 unsigned long flags; 235 struct zfcp_adapter *adapter = fsf_req->adapter; 236 struct zfcp_port *port; 237 238 read_lock_irqsave(&adapter->port_list_lock, flags); 239 list_for_each_entry(port, &adapter->port_list, list) { 240 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 241 zfcp_fc_test_link(port); 242 if (!port->d_id) 243 zfcp_erp_port_reopen(port, 244 ZFCP_STATUS_COMMON_ERP_FAILED, 245 "fcrscn1"); 246 } 247 read_unlock_irqrestore(&adapter->port_list_lock, flags); 248 } 249 250 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 251 { 252 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 253 struct fc_els_rscn *head; 254 struct fc_els_rscn_page *page; 255 u16 i; 256 u16 no_entries; 257 unsigned int afmt; 258 259 head = (struct fc_els_rscn *) status_buffer->payload.data; 260 page = (struct fc_els_rscn_page *) head; 261 262 /* see FC-FS */ 263 no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page); 264 265 for (i = 1; i < no_entries; i++) { 266 /* skip head and start with 1st element */ 267 page++; 268 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 269 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 270 page); 271 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 272 *(u32 *)page); 273 } 274 zfcp_fc_conditional_port_scan(fsf_req->adapter); 275 } 276 277 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 278 { 279 unsigned long flags; 280 struct zfcp_adapter *adapter = req->adapter; 281 struct zfcp_port *port; 282 283 read_lock_irqsave(&adapter->port_list_lock, flags); 284 list_for_each_entry(port, &adapter->port_list, list) 285 if (port->wwpn == wwpn) { 286 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 287 break; 288 } 289 read_unlock_irqrestore(&adapter->port_list_lock, flags); 290 } 291 292 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 293 { 294 struct fsf_status_read_buffer *status_buffer; 295 struct fc_els_flogi *plogi; 296 297 status_buffer = (struct fsf_status_read_buffer *) req->data; 298 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 299 zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn); 300 } 301 302 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 303 { 304 struct fsf_status_read_buffer *status_buffer = 305 (struct fsf_status_read_buffer *)req->data; 306 struct fc_els_logo *logo = 307 (struct fc_els_logo *) status_buffer->payload.data; 308 309 zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn); 310 } 311 312 /** 313 * zfcp_fc_incoming_els - handle incoming ELS 314 * @fsf_req - request which contains incoming ELS 315 */ 316 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 317 { 318 struct fsf_status_read_buffer *status_buffer = 319 (struct fsf_status_read_buffer *) fsf_req->data; 320 unsigned int els_type = status_buffer->payload.data[0]; 321 322 zfcp_dbf_san_in_els("fciels1", fsf_req); 323 if (els_type == ELS_PLOGI) 324 zfcp_fc_incoming_plogi(fsf_req); 325 else if (els_type == ELS_LOGO) 326 zfcp_fc_incoming_logo(fsf_req); 327 else if (els_type == ELS_RSCN) 328 zfcp_fc_incoming_rscn(fsf_req); 329 } 330 331 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 332 { 333 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 334 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 335 336 if (ct_els->status) 337 return; 338 if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC) 339 return; 340 341 /* looks like a valid d_id */ 342 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 343 } 344 345 static void zfcp_fc_complete(void *data) 346 { 347 complete(data); 348 } 349 350 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 351 { 352 ct_hdr->ct_rev = FC_CT_REV; 353 ct_hdr->ct_fs_type = FC_FST_DIR; 354 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 355 ct_hdr->ct_cmd = cmd; 356 ct_hdr->ct_mr_size = mr_size / 4; 357 } 358 359 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 360 struct zfcp_fc_req *fc_req) 361 { 362 struct zfcp_adapter *adapter = port->adapter; 363 DECLARE_COMPLETION_ONSTACK(completion); 364 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 365 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 366 int ret; 367 368 /* setup parameters for send generic command */ 369 fc_req->ct_els.port = port; 370 fc_req->ct_els.handler = zfcp_fc_complete; 371 fc_req->ct_els.handler_data = &completion; 372 fc_req->ct_els.req = &fc_req->sg_req; 373 fc_req->ct_els.resp = &fc_req->sg_rsp; 374 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 375 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 376 377 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 378 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 379 gid_pn_req->gid_pn.fn_wwpn = port->wwpn; 380 381 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 382 adapter->pool.gid_pn_req, 383 ZFCP_FC_CTELS_TMO); 384 if (!ret) { 385 wait_for_completion(&completion); 386 zfcp_fc_ns_gid_pn_eval(fc_req); 387 } 388 return ret; 389 } 390 391 /** 392 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 393 * @port: port where GID_PN request is needed 394 * return: -ENOMEM on error, 0 otherwise 395 */ 396 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 397 { 398 int ret; 399 struct zfcp_fc_req *fc_req; 400 struct zfcp_adapter *adapter = port->adapter; 401 402 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 403 if (!fc_req) 404 return -ENOMEM; 405 406 memset(fc_req, 0, sizeof(*fc_req)); 407 408 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 409 if (ret) 410 goto out; 411 412 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 413 414 zfcp_fc_wka_port_put(&adapter->gs->ds); 415 out: 416 mempool_free(fc_req, adapter->pool.gid_pn); 417 return ret; 418 } 419 420 void zfcp_fc_port_did_lookup(struct work_struct *work) 421 { 422 int ret; 423 struct zfcp_port *port = container_of(work, struct zfcp_port, 424 gid_pn_work); 425 426 ret = zfcp_fc_ns_gid_pn(port); 427 if (ret) { 428 /* could not issue gid_pn for some reason */ 429 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 430 goto out; 431 } 432 433 if (!port->d_id) { 434 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 435 goto out; 436 } 437 438 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 439 out: 440 put_device(&port->dev); 441 } 442 443 /** 444 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 445 * @port: The zfcp_port to lookup the d_id for. 446 */ 447 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 448 { 449 get_device(&port->dev); 450 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 451 put_device(&port->dev); 452 } 453 454 /** 455 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 456 * @port: zfcp_port structure 457 * @plogi: plogi payload 458 * 459 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 460 */ 461 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 462 { 463 if (plogi->fl_wwpn != port->wwpn) { 464 port->d_id = 0; 465 dev_warn(&port->adapter->ccw_device->dev, 466 "A port opened with WWPN 0x%016Lx returned data that " 467 "identifies it as WWPN 0x%016Lx\n", 468 (unsigned long long) port->wwpn, 469 (unsigned long long) plogi->fl_wwpn); 470 return; 471 } 472 473 port->wwnn = plogi->fl_wwnn; 474 port->maxframe_size = plogi->fl_csp.sp_bb_data; 475 476 if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID) 477 port->supported_classes |= FC_COS_CLASS1; 478 if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID) 479 port->supported_classes |= FC_COS_CLASS2; 480 if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID) 481 port->supported_classes |= FC_COS_CLASS3; 482 if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID) 483 port->supported_classes |= FC_COS_CLASS4; 484 } 485 486 static void zfcp_fc_adisc_handler(void *data) 487 { 488 struct zfcp_fc_req *fc_req = data; 489 struct zfcp_port *port = fc_req->ct_els.port; 490 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 491 492 if (fc_req->ct_els.status) { 493 /* request rejected or timed out */ 494 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 495 "fcadh_1"); 496 goto out; 497 } 498 499 if (!port->wwnn) 500 port->wwnn = adisc_resp->adisc_wwnn; 501 502 if ((port->wwpn != adisc_resp->adisc_wwpn) || 503 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 504 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 505 "fcadh_2"); 506 goto out; 507 } 508 509 /* port is good, unblock rport without going through erp */ 510 zfcp_scsi_schedule_rport_register(port); 511 out: 512 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 513 put_device(&port->dev); 514 kmem_cache_free(zfcp_fc_req_cache, fc_req); 515 } 516 517 static int zfcp_fc_adisc(struct zfcp_port *port) 518 { 519 struct zfcp_fc_req *fc_req; 520 struct zfcp_adapter *adapter = port->adapter; 521 struct Scsi_Host *shost = adapter->scsi_host; 522 int ret; 523 524 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 525 if (!fc_req) 526 return -ENOMEM; 527 528 fc_req->ct_els.port = port; 529 fc_req->ct_els.req = &fc_req->sg_req; 530 fc_req->ct_els.resp = &fc_req->sg_rsp; 531 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 532 sizeof(struct fc_els_adisc)); 533 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 534 sizeof(struct fc_els_adisc)); 535 536 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 537 fc_req->ct_els.handler_data = fc_req; 538 539 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 540 without FC-AL-2 capability, so we don't set it */ 541 fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost); 542 fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost); 543 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 544 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 545 546 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, 547 ZFCP_FC_CTELS_TMO); 548 if (ret) 549 kmem_cache_free(zfcp_fc_req_cache, fc_req); 550 551 return ret; 552 } 553 554 void zfcp_fc_link_test_work(struct work_struct *work) 555 { 556 struct zfcp_port *port = 557 container_of(work, struct zfcp_port, test_link_work); 558 int retval; 559 560 get_device(&port->dev); 561 port->rport_task = RPORT_DEL; 562 zfcp_scsi_rport_work(&port->rport_work); 563 564 /* only issue one test command at one time per port */ 565 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 566 goto out; 567 568 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 569 570 retval = zfcp_fc_adisc(port); 571 if (retval == 0) 572 return; 573 574 /* send of ADISC was not possible */ 575 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 576 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 577 578 out: 579 put_device(&port->dev); 580 } 581 582 /** 583 * zfcp_fc_test_link - lightweight link test procedure 584 * @port: port to be tested 585 * 586 * Test status of a link to a remote port using the ELS command ADISC. 587 * If there is a problem with the remote port, error recovery steps 588 * will be triggered. 589 */ 590 void zfcp_fc_test_link(struct zfcp_port *port) 591 { 592 get_device(&port->dev); 593 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 594 put_device(&port->dev); 595 } 596 597 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) 598 { 599 struct zfcp_fc_req *fc_req; 600 601 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 602 if (!fc_req) 603 return NULL; 604 605 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 606 kmem_cache_free(zfcp_fc_req_cache, fc_req); 607 return NULL; 608 } 609 610 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 611 sizeof(struct zfcp_fc_gpn_ft_req)); 612 613 return fc_req; 614 } 615 616 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 617 struct zfcp_adapter *adapter, int max_bytes) 618 { 619 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 620 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 621 DECLARE_COMPLETION_ONSTACK(completion); 622 int ret; 623 624 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 625 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 626 627 ct_els->handler = zfcp_fc_complete; 628 ct_els->handler_data = &completion; 629 ct_els->req = &fc_req->sg_req; 630 ct_els->resp = &fc_req->sg_rsp; 631 632 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 633 ZFCP_FC_CTELS_TMO); 634 if (!ret) 635 wait_for_completion(&completion); 636 return ret; 637 } 638 639 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 640 { 641 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 642 return; 643 644 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 645 646 if ((port->supported_classes != 0) || 647 !list_empty(&port->unit_list)) 648 return; 649 650 list_move_tail(&port->list, lh); 651 } 652 653 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 654 struct zfcp_adapter *adapter, int max_entries) 655 { 656 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 657 struct scatterlist *sg = &fc_req->sg_rsp; 658 struct fc_ct_hdr *hdr = sg_virt(sg); 659 struct fc_gpn_ft_resp *acc = sg_virt(sg); 660 struct zfcp_port *port, *tmp; 661 unsigned long flags; 662 LIST_HEAD(remove_lh); 663 u32 d_id; 664 int ret = 0, x, last = 0; 665 666 if (ct_els->status) 667 return -EIO; 668 669 if (hdr->ct_cmd != FC_FS_ACC) { 670 if (hdr->ct_reason == FC_BA_RJT_UNABLE) 671 return -EAGAIN; /* might be a temporary condition */ 672 return -EIO; 673 } 674 675 if (hdr->ct_mr_size) { 676 dev_warn(&adapter->ccw_device->dev, 677 "The name server reported %d words residual data\n", 678 hdr->ct_mr_size); 679 return -E2BIG; 680 } 681 682 /* first entry is the header */ 683 for (x = 1; x < max_entries && !last; x++) { 684 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 685 acc++; 686 else 687 acc = sg_virt(++sg); 688 689 last = acc->fp_flags & FC_NS_FID_LAST; 690 d_id = ntoh24(acc->fp_fid); 691 692 /* don't attach ports with a well known address */ 693 if (d_id >= FC_FID_WELL_KNOWN_BASE) 694 continue; 695 /* skip the adapter's port and known remote ports */ 696 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host)) 697 continue; 698 699 port = zfcp_port_enqueue(adapter, acc->fp_wwpn, 700 ZFCP_STATUS_COMMON_NOESC, d_id); 701 if (!IS_ERR(port)) 702 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 703 else if (PTR_ERR(port) != -EEXIST) 704 ret = PTR_ERR(port); 705 } 706 707 zfcp_erp_wait(adapter); 708 write_lock_irqsave(&adapter->port_list_lock, flags); 709 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 710 zfcp_fc_validate_port(port, &remove_lh); 711 write_unlock_irqrestore(&adapter->port_list_lock, flags); 712 713 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 714 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 715 device_unregister(&port->dev); 716 } 717 718 return ret; 719 } 720 721 /** 722 * zfcp_fc_scan_ports - scan remote ports and attach new ports 723 * @work: reference to scheduled work 724 */ 725 void zfcp_fc_scan_ports(struct work_struct *work) 726 { 727 struct delayed_work *dw = to_delayed_work(work); 728 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 729 scan_work); 730 int ret, i; 731 struct zfcp_fc_req *fc_req; 732 int chain, max_entries, buf_num, max_bytes; 733 734 zfcp_fc_port_scan_time(adapter); 735 736 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 737 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 738 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 739 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 740 741 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 742 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 743 return; 744 745 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 746 return; 747 748 fc_req = zfcp_alloc_sg_env(buf_num); 749 if (!fc_req) 750 goto out; 751 752 for (i = 0; i < 3; i++) { 753 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 754 if (!ret) { 755 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 756 if (ret == -EAGAIN) 757 ssleep(1); 758 else 759 break; 760 } 761 } 762 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); 763 kmem_cache_free(zfcp_fc_req_cache, fc_req); 764 out: 765 zfcp_fc_wka_port_put(&adapter->gs->ds); 766 } 767 768 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 769 struct zfcp_fc_req *fc_req) 770 { 771 DECLARE_COMPLETION_ONSTACK(completion); 772 char devno[] = "DEVNO:"; 773 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 774 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 775 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 776 int ret; 777 778 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 779 FC_SYMBOLIC_NAME_SIZE); 780 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 781 782 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 783 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 784 785 ct_els->handler = zfcp_fc_complete; 786 ct_els->handler_data = &completion; 787 ct_els->req = &fc_req->sg_req; 788 ct_els->resp = &fc_req->sg_rsp; 789 790 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 791 ZFCP_FC_CTELS_TMO); 792 if (ret) 793 return ret; 794 795 wait_for_completion(&completion); 796 if (ct_els->status) 797 return ct_els->status; 798 799 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 800 !(strstr(gspn_rsp->gspn.fp_name, devno))) 801 snprintf(fc_host_symbolic_name(adapter->scsi_host), 802 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 803 gspn_rsp->gspn.fp_name, devno, 804 dev_name(&adapter->ccw_device->dev), 805 init_utsname()->nodename); 806 else 807 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 808 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 809 810 return 0; 811 } 812 813 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 814 struct zfcp_fc_req *fc_req) 815 { 816 DECLARE_COMPLETION_ONSTACK(completion); 817 struct Scsi_Host *shost = adapter->scsi_host; 818 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 819 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 820 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 821 int ret, len; 822 823 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 824 FC_SYMBOLIC_NAME_SIZE); 825 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 826 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 827 FC_SYMBOLIC_NAME_SIZE); 828 rspn_req->rspn.fr_name_len = len; 829 830 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 831 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 832 833 ct_els->handler = zfcp_fc_complete; 834 ct_els->handler_data = &completion; 835 ct_els->req = &fc_req->sg_req; 836 ct_els->resp = &fc_req->sg_rsp; 837 838 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 839 ZFCP_FC_CTELS_TMO); 840 if (!ret) 841 wait_for_completion(&completion); 842 } 843 844 /** 845 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 846 * @work: ns_up_work of the adapter where to update the symbolic port name 847 * 848 * Retrieve the current symbolic port name that may have been set by 849 * the hardware using the GSPN request and update the fc_host 850 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 851 * the port name is unique for this system), update the symbolic port 852 * name to add Linux specific information and update the FC nameserver 853 * using the RSPN request. 854 */ 855 void zfcp_fc_sym_name_update(struct work_struct *work) 856 { 857 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 858 ns_up_work); 859 int ret; 860 struct zfcp_fc_req *fc_req; 861 862 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 863 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 864 return; 865 866 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 867 if (!fc_req) 868 return; 869 870 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 871 if (ret) 872 goto out_free; 873 874 ret = zfcp_fc_gspn(adapter, fc_req); 875 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 876 goto out_ds_put; 877 878 memset(fc_req, 0, sizeof(*fc_req)); 879 zfcp_fc_rspn(adapter, fc_req); 880 881 out_ds_put: 882 zfcp_fc_wka_port_put(&adapter->gs->ds); 883 out_free: 884 kmem_cache_free(zfcp_fc_req_cache, fc_req); 885 } 886 887 static void zfcp_fc_ct_els_job_handler(void *data) 888 { 889 struct bsg_job *job = data; 890 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 891 struct fc_bsg_reply *jr = job->reply; 892 893 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 894 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 895 jr->result = zfcp_ct_els->status ? -EIO : 0; 896 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 897 } 898 899 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 900 { 901 u32 preamble_word1; 902 u8 gs_type; 903 struct zfcp_adapter *adapter; 904 struct fc_bsg_request *bsg_request = job->request; 905 struct fc_rport *rport = fc_bsg_to_rport(job); 906 struct Scsi_Host *shost; 907 908 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 909 gs_type = (preamble_word1 & 0xff000000) >> 24; 910 911 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 912 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 913 914 switch (gs_type) { 915 case FC_FST_ALIAS: 916 return &adapter->gs->as; 917 case FC_FST_MGMT: 918 return &adapter->gs->ms; 919 case FC_FST_TIME: 920 return &adapter->gs->ts; 921 break; 922 case FC_FST_DIR: 923 return &adapter->gs->ds; 924 break; 925 default: 926 return NULL; 927 } 928 } 929 930 static void zfcp_fc_ct_job_handler(void *data) 931 { 932 struct bsg_job *job = data; 933 struct zfcp_fc_wka_port *wka_port; 934 935 wka_port = zfcp_fc_job_wka_port(job); 936 zfcp_fc_wka_port_put(wka_port); 937 938 zfcp_fc_ct_els_job_handler(data); 939 } 940 941 static int zfcp_fc_exec_els_job(struct bsg_job *job, 942 struct zfcp_adapter *adapter) 943 { 944 struct zfcp_fsf_ct_els *els = job->dd_data; 945 struct fc_rport *rport = fc_bsg_to_rport(job); 946 struct fc_bsg_request *bsg_request = job->request; 947 struct zfcp_port *port; 948 u32 d_id; 949 950 if (rport) { 951 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 952 if (!port) 953 return -EINVAL; 954 955 d_id = port->d_id; 956 put_device(&port->dev); 957 } else 958 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 959 960 els->handler = zfcp_fc_ct_els_job_handler; 961 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 962 } 963 964 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 965 struct zfcp_adapter *adapter) 966 { 967 int ret; 968 struct zfcp_fsf_ct_els *ct = job->dd_data; 969 struct zfcp_fc_wka_port *wka_port; 970 971 wka_port = zfcp_fc_job_wka_port(job); 972 if (!wka_port) 973 return -EINVAL; 974 975 ret = zfcp_fc_wka_port_get(wka_port); 976 if (ret) 977 return ret; 978 979 ct->handler = zfcp_fc_ct_job_handler; 980 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 981 if (ret) 982 zfcp_fc_wka_port_put(wka_port); 983 984 return ret; 985 } 986 987 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 988 { 989 struct Scsi_Host *shost; 990 struct zfcp_adapter *adapter; 991 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 992 struct fc_bsg_request *bsg_request = job->request; 993 struct fc_rport *rport = fc_bsg_to_rport(job); 994 995 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 996 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 997 998 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 999 return -EINVAL; 1000 1001 ct_els->req = job->request_payload.sg_list; 1002 ct_els->resp = job->reply_payload.sg_list; 1003 ct_els->handler_data = job; 1004 1005 switch (bsg_request->msgcode) { 1006 case FC_BSG_RPT_ELS: 1007 case FC_BSG_HST_ELS_NOLOGIN: 1008 return zfcp_fc_exec_els_job(job, adapter); 1009 case FC_BSG_RPT_CT: 1010 case FC_BSG_HST_CT: 1011 return zfcp_fc_exec_ct_job(job, adapter); 1012 default: 1013 return -EINVAL; 1014 } 1015 } 1016 1017 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1018 { 1019 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1020 return -EAGAIN; 1021 } 1022 1023 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1024 { 1025 struct zfcp_fc_wka_ports *wka_ports; 1026 1027 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1028 if (!wka_ports) 1029 return -ENOMEM; 1030 1031 adapter->gs = wka_ports; 1032 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1033 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1034 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1035 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1036 1037 return 0; 1038 } 1039 1040 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1041 { 1042 kfree(adapter->gs); 1043 adapter->gs = NULL; 1044 } 1045 1046