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 pr_fmt(fmt) "zfcp: " 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(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_u32_below(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 * 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 int ret = -EIO; 148 149 if (mutex_lock_interruptible(&wka_port->mutex)) 150 return -ERESTARTSYS; 151 152 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 153 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 154 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 155 if (zfcp_fsf_open_wka_port(wka_port)) { 156 /* could not even send request, nothing to wait for */ 157 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 158 goto out; 159 } 160 } 161 162 wait_event(wka_port->opened, 163 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 164 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 165 166 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 167 atomic_inc(&wka_port->refcount); 168 ret = 0; 169 goto out; 170 } 171 out: 172 mutex_unlock(&wka_port->mutex); 173 return ret; 174 } 175 176 static void zfcp_fc_wka_port_offline(struct work_struct *work) 177 { 178 struct delayed_work *dw = to_delayed_work(work); 179 struct zfcp_fc_wka_port *wka_port = 180 container_of(dw, struct zfcp_fc_wka_port, work); 181 182 mutex_lock(&wka_port->mutex); 183 if ((atomic_read(&wka_port->refcount) != 0) || 184 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 185 goto out; 186 187 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 188 if (zfcp_fsf_close_wka_port(wka_port)) { 189 /* could not even send request, nothing to wait for */ 190 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 191 goto out; 192 } 193 wait_event(wka_port->closed, 194 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 195 out: 196 mutex_unlock(&wka_port->mutex); 197 } 198 199 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 200 { 201 if (atomic_dec_return(&wka_port->refcount) != 0) 202 return; 203 /* wait 10 milliseconds, other reqs might pop in */ 204 queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work, 205 msecs_to_jiffies(10)); 206 } 207 208 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 209 struct zfcp_adapter *adapter) 210 { 211 init_waitqueue_head(&wka_port->opened); 212 init_waitqueue_head(&wka_port->closed); 213 214 wka_port->adapter = adapter; 215 wka_port->d_id = d_id; 216 217 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 218 atomic_set(&wka_port->refcount, 0); 219 mutex_init(&wka_port->mutex); 220 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 221 } 222 223 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 224 { 225 cancel_delayed_work_sync(&wka->work); 226 mutex_lock(&wka->mutex); 227 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 228 mutex_unlock(&wka->mutex); 229 } 230 231 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 232 { 233 if (!gs) 234 return; 235 zfcp_fc_wka_port_force_offline(&gs->ms); 236 zfcp_fc_wka_port_force_offline(&gs->ts); 237 zfcp_fc_wka_port_force_offline(&gs->ds); 238 zfcp_fc_wka_port_force_offline(&gs->as); 239 } 240 241 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 242 struct fc_els_rscn_page *page) 243 { 244 unsigned long flags; 245 struct zfcp_adapter *adapter = fsf_req->adapter; 246 struct zfcp_port *port; 247 248 read_lock_irqsave(&adapter->port_list_lock, flags); 249 list_for_each_entry(port, &adapter->port_list, list) { 250 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 251 zfcp_fc_test_link(port); 252 } 253 read_unlock_irqrestore(&adapter->port_list_lock, flags); 254 } 255 256 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 257 { 258 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 259 struct zfcp_adapter *adapter = fsf_req->adapter; 260 struct fc_els_rscn *head; 261 struct fc_els_rscn_page *page; 262 u16 i; 263 u16 no_entries; 264 unsigned int afmt; 265 266 head = (struct fc_els_rscn *) status_buffer->payload.data; 267 page = (struct fc_els_rscn_page *) head; 268 269 /* see FC-FS */ 270 no_entries = be16_to_cpu(head->rscn_plen) / 271 sizeof(struct fc_els_rscn_page); 272 273 if (no_entries > 1) { 274 /* handle failed ports */ 275 unsigned long flags; 276 struct zfcp_port *port; 277 278 read_lock_irqsave(&adapter->port_list_lock, flags); 279 list_for_each_entry(port, &adapter->port_list, list) { 280 if (port->d_id) 281 continue; 282 zfcp_erp_port_reopen(port, 283 ZFCP_STATUS_COMMON_ERP_FAILED, 284 "fcrscn1"); 285 } 286 read_unlock_irqrestore(&adapter->port_list_lock, flags); 287 } 288 289 for (i = 1; i < no_entries; i++) { 290 /* skip head and start with 1st element */ 291 page++; 292 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 293 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 294 page); 295 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 296 *(u32 *)page); 297 } 298 zfcp_fc_conditional_port_scan(fsf_req->adapter); 299 } 300 301 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 302 { 303 unsigned long flags; 304 struct zfcp_adapter *adapter = req->adapter; 305 struct zfcp_port *port; 306 307 read_lock_irqsave(&adapter->port_list_lock, flags); 308 list_for_each_entry(port, &adapter->port_list, list) 309 if (port->wwpn == wwpn) { 310 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 311 break; 312 } 313 read_unlock_irqrestore(&adapter->port_list_lock, flags); 314 } 315 316 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 317 { 318 struct fsf_status_read_buffer *status_buffer; 319 struct fc_els_flogi *plogi; 320 321 status_buffer = (struct fsf_status_read_buffer *) req->data; 322 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 323 zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); 324 } 325 326 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 327 { 328 struct fsf_status_read_buffer *status_buffer = 329 (struct fsf_status_read_buffer *)req->data; 330 struct fc_els_logo *logo = 331 (struct fc_els_logo *) status_buffer->payload.data; 332 333 zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); 334 } 335 336 /** 337 * zfcp_fc_incoming_els - handle incoming ELS 338 * @fsf_req: request which contains incoming ELS 339 */ 340 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 341 { 342 struct fsf_status_read_buffer *status_buffer = 343 (struct fsf_status_read_buffer *) fsf_req->data; 344 unsigned int els_type = status_buffer->payload.data[0]; 345 346 zfcp_dbf_san_in_els("fciels1", fsf_req); 347 if (els_type == ELS_PLOGI) 348 zfcp_fc_incoming_plogi(fsf_req); 349 else if (els_type == ELS_LOGO) 350 zfcp_fc_incoming_logo(fsf_req); 351 else if (els_type == ELS_RSCN) 352 zfcp_fc_incoming_rscn(fsf_req); 353 } 354 355 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 356 { 357 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 358 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 359 360 if (ct_els->status) 361 return; 362 if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) 363 return; 364 365 /* looks like a valid d_id */ 366 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 367 } 368 369 static void zfcp_fc_complete(void *data) 370 { 371 complete(data); 372 } 373 374 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 375 { 376 ct_hdr->ct_rev = FC_CT_REV; 377 ct_hdr->ct_fs_type = FC_FST_DIR; 378 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 379 ct_hdr->ct_cmd = cpu_to_be16(cmd); 380 ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); 381 } 382 383 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 384 struct zfcp_fc_req *fc_req) 385 { 386 struct zfcp_adapter *adapter = port->adapter; 387 DECLARE_COMPLETION_ONSTACK(completion); 388 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 389 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 390 int ret; 391 392 /* setup parameters for send generic command */ 393 fc_req->ct_els.port = port; 394 fc_req->ct_els.handler = zfcp_fc_complete; 395 fc_req->ct_els.handler_data = &completion; 396 fc_req->ct_els.req = &fc_req->sg_req; 397 fc_req->ct_els.resp = &fc_req->sg_rsp; 398 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 399 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 400 401 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 402 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 403 gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); 404 405 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 406 adapter->pool.gid_pn_req, 407 ZFCP_FC_CTELS_TMO); 408 if (!ret) { 409 wait_for_completion(&completion); 410 zfcp_fc_ns_gid_pn_eval(fc_req); 411 } 412 return ret; 413 } 414 415 /** 416 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 417 * @port: port where GID_PN request is needed 418 * return: -ENOMEM on error, 0 otherwise 419 */ 420 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 421 { 422 int ret; 423 struct zfcp_fc_req *fc_req; 424 struct zfcp_adapter *adapter = port->adapter; 425 426 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 427 if (!fc_req) 428 return -ENOMEM; 429 430 memset(fc_req, 0, sizeof(*fc_req)); 431 432 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 433 if (ret) 434 goto out; 435 436 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 437 438 zfcp_fc_wka_port_put(&adapter->gs->ds); 439 out: 440 mempool_free(fc_req, adapter->pool.gid_pn); 441 return ret; 442 } 443 444 void zfcp_fc_port_did_lookup(struct work_struct *work) 445 { 446 int ret; 447 struct zfcp_port *port = container_of(work, struct zfcp_port, 448 gid_pn_work); 449 450 set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 451 ret = zfcp_fc_ns_gid_pn(port); 452 if (ret) { 453 /* could not issue gid_pn for some reason */ 454 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 455 goto out; 456 } 457 458 if (!port->d_id) { 459 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 460 goto out; 461 } 462 463 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 464 out: 465 put_device(&port->dev); 466 } 467 468 /** 469 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 470 * @port: The zfcp_port to lookup the d_id for. 471 */ 472 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 473 { 474 get_device(&port->dev); 475 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 476 put_device(&port->dev); 477 } 478 479 /** 480 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 481 * @port: zfcp_port structure 482 * @plogi: plogi payload 483 * 484 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 485 */ 486 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 487 { 488 if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { 489 port->d_id = 0; 490 dev_warn(&port->adapter->ccw_device->dev, 491 "A port opened with WWPN 0x%016Lx returned data that " 492 "identifies it as WWPN 0x%016Lx\n", 493 (unsigned long long) port->wwpn, 494 (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); 495 return; 496 } 497 498 port->wwnn = be64_to_cpu(plogi->fl_wwnn); 499 port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); 500 501 if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) 502 port->supported_classes |= FC_COS_CLASS1; 503 if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) 504 port->supported_classes |= FC_COS_CLASS2; 505 if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) 506 port->supported_classes |= FC_COS_CLASS3; 507 if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) 508 port->supported_classes |= FC_COS_CLASS4; 509 } 510 511 static void zfcp_fc_adisc_handler(void *data) 512 { 513 struct zfcp_fc_req *fc_req = data; 514 struct zfcp_port *port = fc_req->ct_els.port; 515 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 516 517 if (fc_req->ct_els.status) { 518 /* request rejected or timed out */ 519 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 520 "fcadh_1"); 521 goto out; 522 } 523 524 if (!port->wwnn) 525 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); 526 527 if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || 528 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 529 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 530 "fcadh_2"); 531 goto out; 532 } 533 534 /* re-init to undo drop from zfcp_fc_adisc() */ 535 port->d_id = ntoh24(adisc_resp->adisc_port_id); 536 /* port is still good, nothing to do */ 537 out: 538 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 539 /* 540 * port ref comes from get_device() in zfcp_fc_test_link() and 541 * work item zfcp_fc_link_test_work() passes ref via 542 * zfcp_fc_adisc() to here, if zfcp_fc_adisc() could send ADISC 543 */ 544 put_device(&port->dev); 545 kmem_cache_free(zfcp_fc_req_cache, fc_req); 546 } 547 548 static int zfcp_fc_adisc(struct zfcp_port *port) 549 { 550 struct zfcp_fc_req *fc_req; 551 struct zfcp_adapter *adapter = port->adapter; 552 struct Scsi_Host *shost = adapter->scsi_host; 553 u32 d_id; 554 int ret; 555 556 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 557 if (!fc_req) 558 return -ENOMEM; 559 560 fc_req->ct_els.port = port; 561 fc_req->ct_els.req = &fc_req->sg_req; 562 fc_req->ct_els.resp = &fc_req->sg_rsp; 563 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 564 sizeof(struct fc_els_adisc)); 565 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 566 sizeof(struct fc_els_adisc)); 567 568 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 569 fc_req->ct_els.handler_data = fc_req; 570 571 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 572 without FC-AL-2 capability, so we don't set it */ 573 fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); 574 fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); 575 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 576 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 577 578 d_id = port->d_id; /* remember as destination for send els below */ 579 /* 580 * Force fresh GID_PN lookup on next port recovery. 581 * Must happen after request setup and before sending request, 582 * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler(). 583 */ 584 port->d_id = 0; 585 586 ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els, 587 ZFCP_FC_CTELS_TMO); 588 if (ret) 589 kmem_cache_free(zfcp_fc_req_cache, fc_req); 590 591 return ret; 592 } 593 594 void zfcp_fc_link_test_work(struct work_struct *work) 595 { 596 struct zfcp_port *port = 597 container_of(work, struct zfcp_port, test_link_work); 598 int retval; 599 600 set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 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; /* port ref passed to zfcp_fc_adisc(), no put here */ 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)); 907 908 BUILD_BUG_ON(sizeof(rspn_req->name) != 909 sizeof(fc_host_symbolic_name(shost))); 910 BUILD_BUG_ON(sizeof(rspn_req->name) != 911 type_max(typeof(rspn_req->rspn.fr_name_len)) + 1); 912 len = strscpy(rspn_req->name, fc_host_symbolic_name(shost), 913 sizeof(rspn_req->name)); 914 /* 915 * It should be impossible for this to truncate (see BUILD_BUG_ON() 916 * above), but be robust anyway. 917 */ 918 if (WARN_ON(len < 0)) 919 len = sizeof(rspn_req->name) - 1; 920 rspn_req->rspn.fr_name_len = len; 921 922 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 923 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 924 925 ct_els->handler = zfcp_fc_complete; 926 ct_els->handler_data = &completion; 927 ct_els->req = &fc_req->sg_req; 928 ct_els->resp = &fc_req->sg_rsp; 929 930 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 931 ZFCP_FC_CTELS_TMO); 932 if (!ret) 933 wait_for_completion(&completion); 934 } 935 936 /** 937 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 938 * @work: ns_up_work of the adapter where to update the symbolic port name 939 * 940 * Retrieve the current symbolic port name that may have been set by 941 * the hardware using the GSPN request and update the fc_host 942 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 943 * the port name is unique for this system), update the symbolic port 944 * name to add Linux specific information and update the FC nameserver 945 * using the RSPN request. 946 */ 947 void zfcp_fc_sym_name_update(struct work_struct *work) 948 { 949 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 950 ns_up_work); 951 int ret; 952 struct zfcp_fc_req *fc_req; 953 954 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 955 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 956 return; 957 958 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 959 if (!fc_req) 960 return; 961 962 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 963 if (ret) 964 goto out_free; 965 966 ret = zfcp_fc_gspn(adapter, fc_req); 967 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 968 goto out_ds_put; 969 970 memset(fc_req, 0, sizeof(*fc_req)); 971 zfcp_fc_rspn(adapter, fc_req); 972 973 out_ds_put: 974 zfcp_fc_wka_port_put(&adapter->gs->ds); 975 out_free: 976 kmem_cache_free(zfcp_fc_req_cache, fc_req); 977 } 978 979 static void zfcp_fc_ct_els_job_handler(void *data) 980 { 981 struct bsg_job *job = data; 982 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 983 struct fc_bsg_reply *jr = job->reply; 984 985 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 986 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 987 jr->result = zfcp_ct_els->status ? -EIO : 0; 988 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 989 } 990 991 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 992 { 993 u32 preamble_word1; 994 u8 gs_type; 995 struct zfcp_adapter *adapter; 996 struct fc_bsg_request *bsg_request = job->request; 997 struct fc_rport *rport = fc_bsg_to_rport(job); 998 struct Scsi_Host *shost; 999 1000 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 1001 gs_type = (preamble_word1 & 0xff000000) >> 24; 1002 1003 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 1004 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 1005 1006 switch (gs_type) { 1007 case FC_FST_ALIAS: 1008 return &adapter->gs->as; 1009 case FC_FST_MGMT: 1010 return &adapter->gs->ms; 1011 case FC_FST_TIME: 1012 return &adapter->gs->ts; 1013 break; 1014 case FC_FST_DIR: 1015 return &adapter->gs->ds; 1016 break; 1017 default: 1018 return NULL; 1019 } 1020 } 1021 1022 static void zfcp_fc_ct_job_handler(void *data) 1023 { 1024 struct bsg_job *job = data; 1025 struct zfcp_fc_wka_port *wka_port; 1026 1027 wka_port = zfcp_fc_job_wka_port(job); 1028 zfcp_fc_wka_port_put(wka_port); 1029 1030 zfcp_fc_ct_els_job_handler(data); 1031 } 1032 1033 static int zfcp_fc_exec_els_job(struct bsg_job *job, 1034 struct zfcp_adapter *adapter) 1035 { 1036 struct zfcp_fsf_ct_els *els = job->dd_data; 1037 struct fc_rport *rport = fc_bsg_to_rport(job); 1038 struct fc_bsg_request *bsg_request = job->request; 1039 struct zfcp_port *port; 1040 u32 d_id; 1041 1042 if (rport) { 1043 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 1044 if (!port) 1045 return -EINVAL; 1046 1047 d_id = port->d_id; 1048 put_device(&port->dev); 1049 } else 1050 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 1051 1052 els->handler = zfcp_fc_ct_els_job_handler; 1053 return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ); 1054 } 1055 1056 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 1057 struct zfcp_adapter *adapter) 1058 { 1059 int ret; 1060 struct zfcp_fsf_ct_els *ct = job->dd_data; 1061 struct zfcp_fc_wka_port *wka_port; 1062 1063 wka_port = zfcp_fc_job_wka_port(job); 1064 if (!wka_port) 1065 return -EINVAL; 1066 1067 ret = zfcp_fc_wka_port_get(wka_port); 1068 if (ret) 1069 return ret; 1070 1071 ct->handler = zfcp_fc_ct_job_handler; 1072 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ); 1073 if (ret) 1074 zfcp_fc_wka_port_put(wka_port); 1075 1076 return ret; 1077 } 1078 1079 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 1080 { 1081 struct Scsi_Host *shost; 1082 struct zfcp_adapter *adapter; 1083 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 1084 struct fc_bsg_request *bsg_request = job->request; 1085 struct fc_rport *rport = fc_bsg_to_rport(job); 1086 1087 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 1088 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 1089 1090 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 1091 return -EINVAL; 1092 1093 ct_els->req = job->request_payload.sg_list; 1094 ct_els->resp = job->reply_payload.sg_list; 1095 ct_els->handler_data = job; 1096 1097 switch (bsg_request->msgcode) { 1098 case FC_BSG_RPT_ELS: 1099 case FC_BSG_HST_ELS_NOLOGIN: 1100 return zfcp_fc_exec_els_job(job, adapter); 1101 case FC_BSG_RPT_CT: 1102 case FC_BSG_HST_CT: 1103 return zfcp_fc_exec_ct_job(job, adapter); 1104 default: 1105 return -EINVAL; 1106 } 1107 } 1108 1109 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1110 { 1111 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1112 return -EAGAIN; 1113 } 1114 1115 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1116 { 1117 struct zfcp_fc_wka_ports *wka_ports; 1118 1119 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1120 if (!wka_ports) 1121 return -ENOMEM; 1122 1123 adapter->gs = wka_ports; 1124 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1125 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1126 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1127 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1128 1129 return 0; 1130 } 1131 1132 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1133 { 1134 kfree(adapter->gs); 1135 adapter->gs = NULL; 1136 } 1137 1138