1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * zfcp device driver 4 * 5 * Fibre Channel related functions for the zfcp device driver. 6 * 7 * Copyright IBM Corp. 2008, 2017 8 */ 9 10 #define KMSG_COMPONENT "zfcp" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 13 #include <linux/types.h> 14 #include <linux/slab.h> 15 #include <linux/utsname.h> 16 #include <linux/random.h> 17 #include <linux/bsg-lib.h> 18 #include <scsi/fc/fc_els.h> 19 #include <scsi/libfc.h> 20 #include "zfcp_ext.h" 21 #include "zfcp_fc.h" 22 23 struct kmem_cache *zfcp_fc_req_cache; 24 25 static u32 zfcp_fc_rscn_range_mask[] = { 26 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 27 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 28 [ELS_ADDR_FMT_DOM] = 0xFF0000, 29 [ELS_ADDR_FMT_FAB] = 0x000000, 30 }; 31 32 static bool no_auto_port_rescan; 33 module_param(no_auto_port_rescan, bool, 0600); 34 MODULE_PARM_DESC(no_auto_port_rescan, 35 "no automatic port_rescan (default off)"); 36 37 static unsigned int port_scan_backoff = 500; 38 module_param(port_scan_backoff, uint, 0600); 39 MODULE_PARM_DESC(port_scan_backoff, 40 "upper limit of port scan random backoff in msecs (default 500)"); 41 42 static unsigned int port_scan_ratelimit = 60000; 43 module_param(port_scan_ratelimit, uint, 0600); 44 MODULE_PARM_DESC(port_scan_ratelimit, 45 "minimum interval between port scans in msecs (default 60000)"); 46 47 unsigned int zfcp_fc_port_scan_backoff(void) 48 { 49 if (!port_scan_backoff) 50 return 0; 51 return get_random_u32_below(port_scan_backoff); 52 } 53 54 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) 55 { 56 unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); 57 unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); 58 59 adapter->next_port_scan = jiffies + interval + backoff; 60 } 61 62 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) 63 { 64 unsigned long now = jiffies; 65 unsigned long next = adapter->next_port_scan; 66 unsigned long delay = 0, max; 67 68 /* delay only needed within waiting period */ 69 if (time_before(now, next)) { 70 delay = next - now; 71 /* paranoia: never ever delay scans longer than specified */ 72 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); 73 delay = min(delay, max); 74 } 75 76 queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); 77 } 78 79 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) 80 { 81 if (no_auto_port_rescan) 82 return; 83 84 zfcp_fc_port_scan(adapter); 85 } 86 87 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) 88 { 89 if (!no_auto_port_rescan) 90 return; 91 92 zfcp_fc_port_scan(adapter); 93 } 94 95 /** 96 * zfcp_fc_post_event - post event to userspace via fc_transport 97 * @work: work struct with enqueued events 98 */ 99 void zfcp_fc_post_event(struct work_struct *work) 100 { 101 struct zfcp_fc_event *event = NULL, *tmp = NULL; 102 LIST_HEAD(tmp_lh); 103 struct zfcp_fc_events *events = container_of(work, 104 struct zfcp_fc_events, work); 105 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 106 events); 107 108 spin_lock_bh(&events->list_lock); 109 list_splice_init(&events->list, &tmp_lh); 110 spin_unlock_bh(&events->list_lock); 111 112 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 113 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 114 event->code, event->data); 115 list_del(&event->list); 116 kfree(event); 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 int ret = -EIO; 149 150 if (mutex_lock_interruptible(&wka_port->mutex)) 151 return -ERESTARTSYS; 152 153 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 154 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 155 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 156 if (zfcp_fsf_open_wka_port(wka_port)) { 157 /* could not even send request, nothing to wait for */ 158 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 159 goto out; 160 } 161 } 162 163 wait_event(wka_port->opened, 164 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 165 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 166 167 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 168 atomic_inc(&wka_port->refcount); 169 ret = 0; 170 goto out; 171 } 172 out: 173 mutex_unlock(&wka_port->mutex); 174 return ret; 175 } 176 177 static void zfcp_fc_wka_port_offline(struct work_struct *work) 178 { 179 struct delayed_work *dw = to_delayed_work(work); 180 struct zfcp_fc_wka_port *wka_port = 181 container_of(dw, struct zfcp_fc_wka_port, work); 182 183 mutex_lock(&wka_port->mutex); 184 if ((atomic_read(&wka_port->refcount) != 0) || 185 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 186 goto out; 187 188 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 189 if (zfcp_fsf_close_wka_port(wka_port)) { 190 /* could not even send request, nothing to wait for */ 191 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 192 goto out; 193 } 194 wait_event(wka_port->closed, 195 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 196 out: 197 mutex_unlock(&wka_port->mutex); 198 } 199 200 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 201 { 202 if (atomic_dec_return(&wka_port->refcount) != 0) 203 return; 204 /* wait 10 milliseconds, other reqs might pop in */ 205 queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work, 206 msecs_to_jiffies(10)); 207 } 208 209 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 210 struct zfcp_adapter *adapter) 211 { 212 init_waitqueue_head(&wka_port->opened); 213 init_waitqueue_head(&wka_port->closed); 214 215 wka_port->adapter = adapter; 216 wka_port->d_id = d_id; 217 218 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 219 atomic_set(&wka_port->refcount, 0); 220 mutex_init(&wka_port->mutex); 221 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 222 } 223 224 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 225 { 226 cancel_delayed_work_sync(&wka->work); 227 mutex_lock(&wka->mutex); 228 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 229 mutex_unlock(&wka->mutex); 230 } 231 232 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 233 { 234 if (!gs) 235 return; 236 zfcp_fc_wka_port_force_offline(&gs->ms); 237 zfcp_fc_wka_port_force_offline(&gs->ts); 238 zfcp_fc_wka_port_force_offline(&gs->ds); 239 zfcp_fc_wka_port_force_offline(&gs->as); 240 } 241 242 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 243 struct fc_els_rscn_page *page) 244 { 245 unsigned long flags; 246 struct zfcp_adapter *adapter = fsf_req->adapter; 247 struct zfcp_port *port; 248 249 read_lock_irqsave(&adapter->port_list_lock, flags); 250 list_for_each_entry(port, &adapter->port_list, list) { 251 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 252 zfcp_fc_test_link(port); 253 } 254 read_unlock_irqrestore(&adapter->port_list_lock, flags); 255 } 256 257 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 258 { 259 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 260 struct zfcp_adapter *adapter = fsf_req->adapter; 261 struct fc_els_rscn *head; 262 struct fc_els_rscn_page *page; 263 u16 i; 264 u16 no_entries; 265 unsigned int afmt; 266 267 head = (struct fc_els_rscn *) status_buffer->payload.data; 268 page = (struct fc_els_rscn_page *) head; 269 270 /* see FC-FS */ 271 no_entries = be16_to_cpu(head->rscn_plen) / 272 sizeof(struct fc_els_rscn_page); 273 274 if (no_entries > 1) { 275 /* handle failed ports */ 276 unsigned long flags; 277 struct zfcp_port *port; 278 279 read_lock_irqsave(&adapter->port_list_lock, flags); 280 list_for_each_entry(port, &adapter->port_list, list) { 281 if (port->d_id) 282 continue; 283 zfcp_erp_port_reopen(port, 284 ZFCP_STATUS_COMMON_ERP_FAILED, 285 "fcrscn1"); 286 } 287 read_unlock_irqrestore(&adapter->port_list_lock, flags); 288 } 289 290 for (i = 1; i < no_entries; i++) { 291 /* skip head and start with 1st element */ 292 page++; 293 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 294 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 295 page); 296 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 297 *(u32 *)page); 298 } 299 zfcp_fc_conditional_port_scan(fsf_req->adapter); 300 } 301 302 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 303 { 304 unsigned long flags; 305 struct zfcp_adapter *adapter = req->adapter; 306 struct zfcp_port *port; 307 308 read_lock_irqsave(&adapter->port_list_lock, flags); 309 list_for_each_entry(port, &adapter->port_list, list) 310 if (port->wwpn == wwpn) { 311 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 312 break; 313 } 314 read_unlock_irqrestore(&adapter->port_list_lock, flags); 315 } 316 317 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 318 { 319 struct fsf_status_read_buffer *status_buffer; 320 struct fc_els_flogi *plogi; 321 322 status_buffer = (struct fsf_status_read_buffer *) req->data; 323 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 324 zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); 325 } 326 327 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 328 { 329 struct fsf_status_read_buffer *status_buffer = 330 (struct fsf_status_read_buffer *)req->data; 331 struct fc_els_logo *logo = 332 (struct fc_els_logo *) status_buffer->payload.data; 333 334 zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); 335 } 336 337 /** 338 * zfcp_fc_incoming_els - handle incoming ELS 339 * @fsf_req: request which contains incoming ELS 340 */ 341 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 342 { 343 struct fsf_status_read_buffer *status_buffer = 344 (struct fsf_status_read_buffer *) fsf_req->data; 345 unsigned int els_type = status_buffer->payload.data[0]; 346 347 zfcp_dbf_san_in_els("fciels1", fsf_req); 348 if (els_type == ELS_PLOGI) 349 zfcp_fc_incoming_plogi(fsf_req); 350 else if (els_type == ELS_LOGO) 351 zfcp_fc_incoming_logo(fsf_req); 352 else if (els_type == ELS_RSCN) 353 zfcp_fc_incoming_rscn(fsf_req); 354 } 355 356 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 357 { 358 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 359 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 360 361 if (ct_els->status) 362 return; 363 if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) 364 return; 365 366 /* looks like a valid d_id */ 367 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 368 } 369 370 static void zfcp_fc_complete(void *data) 371 { 372 complete(data); 373 } 374 375 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 376 { 377 ct_hdr->ct_rev = FC_CT_REV; 378 ct_hdr->ct_fs_type = FC_FST_DIR; 379 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 380 ct_hdr->ct_cmd = cpu_to_be16(cmd); 381 ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); 382 } 383 384 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 385 struct zfcp_fc_req *fc_req) 386 { 387 struct zfcp_adapter *adapter = port->adapter; 388 DECLARE_COMPLETION_ONSTACK(completion); 389 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 390 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 391 int ret; 392 393 /* setup parameters for send generic command */ 394 fc_req->ct_els.port = port; 395 fc_req->ct_els.handler = zfcp_fc_complete; 396 fc_req->ct_els.handler_data = &completion; 397 fc_req->ct_els.req = &fc_req->sg_req; 398 fc_req->ct_els.resp = &fc_req->sg_rsp; 399 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 400 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 401 402 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 403 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 404 gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); 405 406 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 407 adapter->pool.gid_pn_req, 408 ZFCP_FC_CTELS_TMO); 409 if (!ret) { 410 wait_for_completion(&completion); 411 zfcp_fc_ns_gid_pn_eval(fc_req); 412 } 413 return ret; 414 } 415 416 /** 417 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 418 * @port: port where GID_PN request is needed 419 * return: -ENOMEM on error, 0 otherwise 420 */ 421 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 422 { 423 int ret; 424 struct zfcp_fc_req *fc_req; 425 struct zfcp_adapter *adapter = port->adapter; 426 427 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 428 if (!fc_req) 429 return -ENOMEM; 430 431 memset(fc_req, 0, sizeof(*fc_req)); 432 433 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 434 if (ret) 435 goto out; 436 437 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 438 439 zfcp_fc_wka_port_put(&adapter->gs->ds); 440 out: 441 mempool_free(fc_req, adapter->pool.gid_pn); 442 return ret; 443 } 444 445 void zfcp_fc_port_did_lookup(struct work_struct *work) 446 { 447 int ret; 448 struct zfcp_port *port = container_of(work, struct zfcp_port, 449 gid_pn_work); 450 451 set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 452 ret = zfcp_fc_ns_gid_pn(port); 453 if (ret) { 454 /* could not issue gid_pn for some reason */ 455 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 456 goto out; 457 } 458 459 if (!port->d_id) { 460 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 461 goto out; 462 } 463 464 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 465 out: 466 put_device(&port->dev); 467 } 468 469 /** 470 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 471 * @port: The zfcp_port to lookup the d_id for. 472 */ 473 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 474 { 475 get_device(&port->dev); 476 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 477 put_device(&port->dev); 478 } 479 480 /** 481 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 482 * @port: zfcp_port structure 483 * @plogi: plogi payload 484 * 485 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 486 */ 487 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 488 { 489 if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { 490 port->d_id = 0; 491 dev_warn(&port->adapter->ccw_device->dev, 492 "A port opened with WWPN 0x%016Lx returned data that " 493 "identifies it as WWPN 0x%016Lx\n", 494 (unsigned long long) port->wwpn, 495 (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); 496 return; 497 } 498 499 port->wwnn = be64_to_cpu(plogi->fl_wwnn); 500 port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); 501 502 if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) 503 port->supported_classes |= FC_COS_CLASS1; 504 if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) 505 port->supported_classes |= FC_COS_CLASS2; 506 if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) 507 port->supported_classes |= FC_COS_CLASS3; 508 if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) 509 port->supported_classes |= FC_COS_CLASS4; 510 } 511 512 static void zfcp_fc_adisc_handler(void *data) 513 { 514 struct zfcp_fc_req *fc_req = data; 515 struct zfcp_port *port = fc_req->ct_els.port; 516 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 517 518 if (fc_req->ct_els.status) { 519 /* request rejected or timed out */ 520 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 521 "fcadh_1"); 522 goto out; 523 } 524 525 if (!port->wwnn) 526 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); 527 528 if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || 529 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 530 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 531 "fcadh_2"); 532 goto out; 533 } 534 535 /* re-init to undo drop from zfcp_fc_adisc() */ 536 port->d_id = ntoh24(adisc_resp->adisc_port_id); 537 /* port is good, unblock rport without going through erp */ 538 zfcp_scsi_schedule_rport_register(port); 539 out: 540 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 541 put_device(&port->dev); 542 kmem_cache_free(zfcp_fc_req_cache, fc_req); 543 } 544 545 static int zfcp_fc_adisc(struct zfcp_port *port) 546 { 547 struct zfcp_fc_req *fc_req; 548 struct zfcp_adapter *adapter = port->adapter; 549 struct Scsi_Host *shost = adapter->scsi_host; 550 u32 d_id; 551 int ret; 552 553 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 554 if (!fc_req) 555 return -ENOMEM; 556 557 fc_req->ct_els.port = port; 558 fc_req->ct_els.req = &fc_req->sg_req; 559 fc_req->ct_els.resp = &fc_req->sg_rsp; 560 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 561 sizeof(struct fc_els_adisc)); 562 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 563 sizeof(struct fc_els_adisc)); 564 565 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 566 fc_req->ct_els.handler_data = fc_req; 567 568 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 569 without FC-AL-2 capability, so we don't set it */ 570 fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); 571 fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); 572 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 573 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 574 575 d_id = port->d_id; /* remember as destination for send els below */ 576 /* 577 * Force fresh GID_PN lookup on next port recovery. 578 * Must happen after request setup and before sending request, 579 * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler(). 580 */ 581 port->d_id = 0; 582 583 ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els, 584 ZFCP_FC_CTELS_TMO); 585 if (ret) 586 kmem_cache_free(zfcp_fc_req_cache, fc_req); 587 588 return ret; 589 } 590 591 void zfcp_fc_link_test_work(struct work_struct *work) 592 { 593 struct zfcp_port *port = 594 container_of(work, struct zfcp_port, test_link_work); 595 int retval; 596 597 set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 598 get_device(&port->dev); 599 port->rport_task = RPORT_DEL; 600 zfcp_scsi_rport_work(&port->rport_work); 601 602 /* only issue one test command at one time per port */ 603 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 604 goto out; 605 606 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 607 608 retval = zfcp_fc_adisc(port); 609 if (retval == 0) 610 return; 611 612 /* send of ADISC was not possible */ 613 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 614 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 615 616 out: 617 put_device(&port->dev); 618 } 619 620 /** 621 * zfcp_fc_test_link - lightweight link test procedure 622 * @port: port to be tested 623 * 624 * Test status of a link to a remote port using the ELS command ADISC. 625 * If there is a problem with the remote port, error recovery steps 626 * will be triggered. 627 */ 628 void zfcp_fc_test_link(struct zfcp_port *port) 629 { 630 get_device(&port->dev); 631 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 632 put_device(&port->dev); 633 } 634 635 /** 636 * zfcp_fc_sg_free_table - free memory used by scatterlists 637 * @sg: pointer to scatterlist 638 * @count: number of scatterlist which are to be free'ed 639 * the scatterlist are expected to reference pages always 640 */ 641 static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count) 642 { 643 int i; 644 645 for (i = 0; i < count; i++, sg = sg_next(sg)) 646 if (sg) 647 free_page((unsigned long) sg_virt(sg)); 648 else 649 break; 650 } 651 652 /** 653 * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers 654 * @sg: pointer to struct scatterlist 655 * @count: number of scatterlists which should be assigned with buffers 656 * of size page 657 * 658 * Returns: 0 on success, -ENOMEM otherwise 659 */ 660 static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count) 661 { 662 void *addr; 663 int i; 664 665 sg_init_table(sg, count); 666 for (i = 0; i < count; i++, sg = sg_next(sg)) { 667 addr = (void *) get_zeroed_page(GFP_KERNEL); 668 if (!addr) { 669 zfcp_fc_sg_free_table(sg, i); 670 return -ENOMEM; 671 } 672 sg_set_buf(sg, addr, PAGE_SIZE); 673 } 674 return 0; 675 } 676 677 static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num) 678 { 679 struct zfcp_fc_req *fc_req; 680 681 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 682 if (!fc_req) 683 return NULL; 684 685 if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 686 kmem_cache_free(zfcp_fc_req_cache, fc_req); 687 return NULL; 688 } 689 690 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 691 sizeof(struct zfcp_fc_gpn_ft_req)); 692 693 return fc_req; 694 } 695 696 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 697 struct zfcp_adapter *adapter, int max_bytes) 698 { 699 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 700 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 701 DECLARE_COMPLETION_ONSTACK(completion); 702 int ret; 703 704 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 705 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 706 707 ct_els->handler = zfcp_fc_complete; 708 ct_els->handler_data = &completion; 709 ct_els->req = &fc_req->sg_req; 710 ct_els->resp = &fc_req->sg_rsp; 711 712 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 713 ZFCP_FC_CTELS_TMO); 714 if (!ret) 715 wait_for_completion(&completion); 716 return ret; 717 } 718 719 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 720 { 721 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 722 return; 723 724 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 725 726 if ((port->supported_classes != 0) || 727 !list_empty(&port->unit_list)) 728 return; 729 730 list_move_tail(&port->list, lh); 731 } 732 733 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 734 struct zfcp_adapter *adapter, int max_entries) 735 { 736 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 737 struct scatterlist *sg = &fc_req->sg_rsp; 738 struct fc_ct_hdr *hdr = sg_virt(sg); 739 struct fc_gpn_ft_resp *acc = sg_virt(sg); 740 struct zfcp_port *port, *tmp; 741 unsigned long flags; 742 LIST_HEAD(remove_lh); 743 u32 d_id; 744 int ret = 0, x, last = 0; 745 746 if (ct_els->status) 747 return -EIO; 748 749 if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { 750 if (hdr->ct_reason == FC_FS_RJT_UNABL) 751 return -EAGAIN; /* might be a temporary condition */ 752 return -EIO; 753 } 754 755 if (hdr->ct_mr_size) { 756 dev_warn(&adapter->ccw_device->dev, 757 "The name server reported %d words residual data\n", 758 hdr->ct_mr_size); 759 return -E2BIG; 760 } 761 762 /* first entry is the header */ 763 for (x = 1; x < max_entries && !last; x++) { 764 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 765 acc++; 766 else 767 acc = sg_virt(++sg); 768 769 last = acc->fp_flags & FC_NS_FID_LAST; 770 d_id = ntoh24(acc->fp_fid); 771 772 /* don't attach ports with a well known address */ 773 if (d_id >= FC_FID_WELL_KNOWN_BASE) 774 continue; 775 /* skip the adapter's port and known remote ports */ 776 if (be64_to_cpu(acc->fp_wwpn) == 777 fc_host_port_name(adapter->scsi_host)) 778 continue; 779 780 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), 781 ZFCP_STATUS_COMMON_NOESC, d_id); 782 if (!IS_ERR(port)) 783 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 784 else if (PTR_ERR(port) != -EEXIST) 785 ret = PTR_ERR(port); 786 } 787 788 zfcp_erp_wait(adapter); 789 write_lock_irqsave(&adapter->port_list_lock, flags); 790 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 791 zfcp_fc_validate_port(port, &remove_lh); 792 write_unlock_irqrestore(&adapter->port_list_lock, flags); 793 794 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 795 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 796 device_unregister(&port->dev); 797 } 798 799 return ret; 800 } 801 802 /** 803 * zfcp_fc_scan_ports - scan remote ports and attach new ports 804 * @work: reference to scheduled work 805 */ 806 void zfcp_fc_scan_ports(struct work_struct *work) 807 { 808 struct delayed_work *dw = to_delayed_work(work); 809 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 810 scan_work); 811 int ret, i; 812 struct zfcp_fc_req *fc_req; 813 int chain, max_entries, buf_num, max_bytes; 814 815 zfcp_fc_port_scan_time(adapter); 816 817 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 818 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 819 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 820 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 821 822 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 823 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 824 return; 825 826 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 827 return; 828 829 fc_req = zfcp_fc_alloc_sg_env(buf_num); 830 if (!fc_req) 831 goto out; 832 833 for (i = 0; i < 3; i++) { 834 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 835 if (!ret) { 836 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 837 if (ret == -EAGAIN) 838 ssleep(1); 839 else 840 break; 841 } 842 } 843 zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num); 844 kmem_cache_free(zfcp_fc_req_cache, fc_req); 845 out: 846 zfcp_fc_wka_port_put(&adapter->gs->ds); 847 } 848 849 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 850 struct zfcp_fc_req *fc_req) 851 { 852 DECLARE_COMPLETION_ONSTACK(completion); 853 char devno[] = "DEVNO:"; 854 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 855 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 856 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 857 int ret; 858 859 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 860 FC_SYMBOLIC_NAME_SIZE); 861 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 862 863 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 864 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 865 866 ct_els->handler = zfcp_fc_complete; 867 ct_els->handler_data = &completion; 868 ct_els->req = &fc_req->sg_req; 869 ct_els->resp = &fc_req->sg_rsp; 870 871 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 872 ZFCP_FC_CTELS_TMO); 873 if (ret) 874 return ret; 875 876 wait_for_completion(&completion); 877 if (ct_els->status) 878 return ct_els->status; 879 880 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 881 !(strstr(gspn_rsp->gspn.fp_name, devno))) 882 snprintf(fc_host_symbolic_name(adapter->scsi_host), 883 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 884 gspn_rsp->gspn.fp_name, devno, 885 dev_name(&adapter->ccw_device->dev), 886 init_utsname()->nodename); 887 else 888 strscpy(fc_host_symbolic_name(adapter->scsi_host), 889 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 890 891 return 0; 892 } 893 894 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 895 struct zfcp_fc_req *fc_req) 896 { 897 DECLARE_COMPLETION_ONSTACK(completion); 898 struct Scsi_Host *shost = adapter->scsi_host; 899 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 900 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 901 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 902 int ret, len; 903 904 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 905 FC_SYMBOLIC_NAME_SIZE); 906 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 907 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 908 FC_SYMBOLIC_NAME_SIZE); 909 rspn_req->rspn.fr_name_len = len; 910 911 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 912 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 913 914 ct_els->handler = zfcp_fc_complete; 915 ct_els->handler_data = &completion; 916 ct_els->req = &fc_req->sg_req; 917 ct_els->resp = &fc_req->sg_rsp; 918 919 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 920 ZFCP_FC_CTELS_TMO); 921 if (!ret) 922 wait_for_completion(&completion); 923 } 924 925 /** 926 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 927 * @work: ns_up_work of the adapter where to update the symbolic port name 928 * 929 * Retrieve the current symbolic port name that may have been set by 930 * the hardware using the GSPN request and update the fc_host 931 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 932 * the port name is unique for this system), update the symbolic port 933 * name to add Linux specific information and update the FC nameserver 934 * using the RSPN request. 935 */ 936 void zfcp_fc_sym_name_update(struct work_struct *work) 937 { 938 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 939 ns_up_work); 940 int ret; 941 struct zfcp_fc_req *fc_req; 942 943 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 944 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 945 return; 946 947 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 948 if (!fc_req) 949 return; 950 951 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 952 if (ret) 953 goto out_free; 954 955 ret = zfcp_fc_gspn(adapter, fc_req); 956 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 957 goto out_ds_put; 958 959 memset(fc_req, 0, sizeof(*fc_req)); 960 zfcp_fc_rspn(adapter, fc_req); 961 962 out_ds_put: 963 zfcp_fc_wka_port_put(&adapter->gs->ds); 964 out_free: 965 kmem_cache_free(zfcp_fc_req_cache, fc_req); 966 } 967 968 static void zfcp_fc_ct_els_job_handler(void *data) 969 { 970 struct bsg_job *job = data; 971 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 972 struct fc_bsg_reply *jr = job->reply; 973 974 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 975 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 976 jr->result = zfcp_ct_els->status ? -EIO : 0; 977 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 978 } 979 980 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 981 { 982 u32 preamble_word1; 983 u8 gs_type; 984 struct zfcp_adapter *adapter; 985 struct fc_bsg_request *bsg_request = job->request; 986 struct fc_rport *rport = fc_bsg_to_rport(job); 987 struct Scsi_Host *shost; 988 989 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 990 gs_type = (preamble_word1 & 0xff000000) >> 24; 991 992 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 993 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 994 995 switch (gs_type) { 996 case FC_FST_ALIAS: 997 return &adapter->gs->as; 998 case FC_FST_MGMT: 999 return &adapter->gs->ms; 1000 case FC_FST_TIME: 1001 return &adapter->gs->ts; 1002 break; 1003 case FC_FST_DIR: 1004 return &adapter->gs->ds; 1005 break; 1006 default: 1007 return NULL; 1008 } 1009 } 1010 1011 static void zfcp_fc_ct_job_handler(void *data) 1012 { 1013 struct bsg_job *job = data; 1014 struct zfcp_fc_wka_port *wka_port; 1015 1016 wka_port = zfcp_fc_job_wka_port(job); 1017 zfcp_fc_wka_port_put(wka_port); 1018 1019 zfcp_fc_ct_els_job_handler(data); 1020 } 1021 1022 static int zfcp_fc_exec_els_job(struct bsg_job *job, 1023 struct zfcp_adapter *adapter) 1024 { 1025 struct zfcp_fsf_ct_els *els = job->dd_data; 1026 struct fc_rport *rport = fc_bsg_to_rport(job); 1027 struct fc_bsg_request *bsg_request = job->request; 1028 struct zfcp_port *port; 1029 u32 d_id; 1030 1031 if (rport) { 1032 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 1033 if (!port) 1034 return -EINVAL; 1035 1036 d_id = port->d_id; 1037 put_device(&port->dev); 1038 } else 1039 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 1040 1041 els->handler = zfcp_fc_ct_els_job_handler; 1042 return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ); 1043 } 1044 1045 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 1046 struct zfcp_adapter *adapter) 1047 { 1048 int ret; 1049 struct zfcp_fsf_ct_els *ct = job->dd_data; 1050 struct zfcp_fc_wka_port *wka_port; 1051 1052 wka_port = zfcp_fc_job_wka_port(job); 1053 if (!wka_port) 1054 return -EINVAL; 1055 1056 ret = zfcp_fc_wka_port_get(wka_port); 1057 if (ret) 1058 return ret; 1059 1060 ct->handler = zfcp_fc_ct_job_handler; 1061 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ); 1062 if (ret) 1063 zfcp_fc_wka_port_put(wka_port); 1064 1065 return ret; 1066 } 1067 1068 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 1069 { 1070 struct Scsi_Host *shost; 1071 struct zfcp_adapter *adapter; 1072 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 1073 struct fc_bsg_request *bsg_request = job->request; 1074 struct fc_rport *rport = fc_bsg_to_rport(job); 1075 1076 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 1077 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 1078 1079 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 1080 return -EINVAL; 1081 1082 ct_els->req = job->request_payload.sg_list; 1083 ct_els->resp = job->reply_payload.sg_list; 1084 ct_els->handler_data = job; 1085 1086 switch (bsg_request->msgcode) { 1087 case FC_BSG_RPT_ELS: 1088 case FC_BSG_HST_ELS_NOLOGIN: 1089 return zfcp_fc_exec_els_job(job, adapter); 1090 case FC_BSG_RPT_CT: 1091 case FC_BSG_HST_CT: 1092 return zfcp_fc_exec_ct_job(job, adapter); 1093 default: 1094 return -EINVAL; 1095 } 1096 } 1097 1098 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1099 { 1100 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1101 return -EAGAIN; 1102 } 1103 1104 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1105 { 1106 struct zfcp_fc_wka_ports *wka_ports; 1107 1108 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1109 if (!wka_ports) 1110 return -ENOMEM; 1111 1112 adapter->gs = wka_ports; 1113 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1114 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1115 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1116 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1117 1118 return 0; 1119 } 1120 1121 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1122 { 1123 kfree(adapter->gs); 1124 adapter->gs = NULL; 1125 } 1126 1127