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_int() % 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 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 = be16_to_cpu(head->rscn_plen) / 264 sizeof(struct fc_els_rscn_page); 265 266 for (i = 1; i < no_entries; i++) { 267 /* skip head and start with 1st element */ 268 page++; 269 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 270 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 271 page); 272 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 273 *(u32 *)page); 274 } 275 zfcp_fc_conditional_port_scan(fsf_req->adapter); 276 } 277 278 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 279 { 280 unsigned long flags; 281 struct zfcp_adapter *adapter = req->adapter; 282 struct zfcp_port *port; 283 284 read_lock_irqsave(&adapter->port_list_lock, flags); 285 list_for_each_entry(port, &adapter->port_list, list) 286 if (port->wwpn == wwpn) { 287 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 288 break; 289 } 290 read_unlock_irqrestore(&adapter->port_list_lock, flags); 291 } 292 293 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 294 { 295 struct fsf_status_read_buffer *status_buffer; 296 struct fc_els_flogi *plogi; 297 298 status_buffer = (struct fsf_status_read_buffer *) req->data; 299 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 300 zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); 301 } 302 303 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 304 { 305 struct fsf_status_read_buffer *status_buffer = 306 (struct fsf_status_read_buffer *)req->data; 307 struct fc_els_logo *logo = 308 (struct fc_els_logo *) status_buffer->payload.data; 309 310 zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); 311 } 312 313 /** 314 * zfcp_fc_incoming_els - handle incoming ELS 315 * @fsf_req: request which contains incoming ELS 316 */ 317 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 318 { 319 struct fsf_status_read_buffer *status_buffer = 320 (struct fsf_status_read_buffer *) fsf_req->data; 321 unsigned int els_type = status_buffer->payload.data[0]; 322 323 zfcp_dbf_san_in_els("fciels1", fsf_req); 324 if (els_type == ELS_PLOGI) 325 zfcp_fc_incoming_plogi(fsf_req); 326 else if (els_type == ELS_LOGO) 327 zfcp_fc_incoming_logo(fsf_req); 328 else if (els_type == ELS_RSCN) 329 zfcp_fc_incoming_rscn(fsf_req); 330 } 331 332 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 333 { 334 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 335 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 336 337 if (ct_els->status) 338 return; 339 if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) 340 return; 341 342 /* looks like a valid d_id */ 343 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 344 } 345 346 static void zfcp_fc_complete(void *data) 347 { 348 complete(data); 349 } 350 351 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 352 { 353 ct_hdr->ct_rev = FC_CT_REV; 354 ct_hdr->ct_fs_type = FC_FST_DIR; 355 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 356 ct_hdr->ct_cmd = cpu_to_be16(cmd); 357 ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); 358 } 359 360 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 361 struct zfcp_fc_req *fc_req) 362 { 363 struct zfcp_adapter *adapter = port->adapter; 364 DECLARE_COMPLETION_ONSTACK(completion); 365 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 366 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 367 int ret; 368 369 /* setup parameters for send generic command */ 370 fc_req->ct_els.port = port; 371 fc_req->ct_els.handler = zfcp_fc_complete; 372 fc_req->ct_els.handler_data = &completion; 373 fc_req->ct_els.req = &fc_req->sg_req; 374 fc_req->ct_els.resp = &fc_req->sg_rsp; 375 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 376 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 377 378 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 379 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 380 gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); 381 382 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 383 adapter->pool.gid_pn_req, 384 ZFCP_FC_CTELS_TMO); 385 if (!ret) { 386 wait_for_completion(&completion); 387 zfcp_fc_ns_gid_pn_eval(fc_req); 388 } 389 return ret; 390 } 391 392 /** 393 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 394 * @port: port where GID_PN request is needed 395 * return: -ENOMEM on error, 0 otherwise 396 */ 397 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 398 { 399 int ret; 400 struct zfcp_fc_req *fc_req; 401 struct zfcp_adapter *adapter = port->adapter; 402 403 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 404 if (!fc_req) 405 return -ENOMEM; 406 407 memset(fc_req, 0, sizeof(*fc_req)); 408 409 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 410 if (ret) 411 goto out; 412 413 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 414 415 zfcp_fc_wka_port_put(&adapter->gs->ds); 416 out: 417 mempool_free(fc_req, adapter->pool.gid_pn); 418 return ret; 419 } 420 421 void zfcp_fc_port_did_lookup(struct work_struct *work) 422 { 423 int ret; 424 struct zfcp_port *port = container_of(work, struct zfcp_port, 425 gid_pn_work); 426 427 set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 428 ret = zfcp_fc_ns_gid_pn(port); 429 if (ret) { 430 /* could not issue gid_pn for some reason */ 431 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 432 goto out; 433 } 434 435 if (!port->d_id) { 436 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 437 goto out; 438 } 439 440 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 441 out: 442 put_device(&port->dev); 443 } 444 445 /** 446 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 447 * @port: The zfcp_port to lookup the d_id for. 448 */ 449 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 450 { 451 get_device(&port->dev); 452 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 453 put_device(&port->dev); 454 } 455 456 /** 457 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 458 * @port: zfcp_port structure 459 * @plogi: plogi payload 460 * 461 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 462 */ 463 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 464 { 465 if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { 466 port->d_id = 0; 467 dev_warn(&port->adapter->ccw_device->dev, 468 "A port opened with WWPN 0x%016Lx returned data that " 469 "identifies it as WWPN 0x%016Lx\n", 470 (unsigned long long) port->wwpn, 471 (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); 472 return; 473 } 474 475 port->wwnn = be64_to_cpu(plogi->fl_wwnn); 476 port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); 477 478 if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) 479 port->supported_classes |= FC_COS_CLASS1; 480 if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) 481 port->supported_classes |= FC_COS_CLASS2; 482 if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) 483 port->supported_classes |= FC_COS_CLASS3; 484 if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) 485 port->supported_classes |= FC_COS_CLASS4; 486 } 487 488 static void zfcp_fc_adisc_handler(void *data) 489 { 490 struct zfcp_fc_req *fc_req = data; 491 struct zfcp_port *port = fc_req->ct_els.port; 492 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 493 494 if (fc_req->ct_els.status) { 495 /* request rejected or timed out */ 496 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 497 "fcadh_1"); 498 goto out; 499 } 500 501 if (!port->wwnn) 502 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); 503 504 if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || 505 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 506 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 507 "fcadh_2"); 508 goto out; 509 } 510 511 /* port is good, unblock rport without going through erp */ 512 zfcp_scsi_schedule_rport_register(port); 513 out: 514 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 515 put_device(&port->dev); 516 kmem_cache_free(zfcp_fc_req_cache, fc_req); 517 } 518 519 static int zfcp_fc_adisc(struct zfcp_port *port) 520 { 521 struct zfcp_fc_req *fc_req; 522 struct zfcp_adapter *adapter = port->adapter; 523 struct Scsi_Host *shost = adapter->scsi_host; 524 int ret; 525 526 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 527 if (!fc_req) 528 return -ENOMEM; 529 530 fc_req->ct_els.port = port; 531 fc_req->ct_els.req = &fc_req->sg_req; 532 fc_req->ct_els.resp = &fc_req->sg_rsp; 533 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 534 sizeof(struct fc_els_adisc)); 535 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 536 sizeof(struct fc_els_adisc)); 537 538 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 539 fc_req->ct_els.handler_data = fc_req; 540 541 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 542 without FC-AL-2 capability, so we don't set it */ 543 fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); 544 fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); 545 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 546 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 547 548 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, 549 ZFCP_FC_CTELS_TMO); 550 if (ret) 551 kmem_cache_free(zfcp_fc_req_cache, fc_req); 552 553 return ret; 554 } 555 556 void zfcp_fc_link_test_work(struct work_struct *work) 557 { 558 struct zfcp_port *port = 559 container_of(work, struct zfcp_port, test_link_work); 560 int retval; 561 562 set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ 563 get_device(&port->dev); 564 port->rport_task = RPORT_DEL; 565 zfcp_scsi_rport_work(&port->rport_work); 566 567 /* only issue one test command at one time per port */ 568 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 569 goto out; 570 571 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 572 573 retval = zfcp_fc_adisc(port); 574 if (retval == 0) 575 return; 576 577 /* send of ADISC was not possible */ 578 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 579 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 580 581 out: 582 put_device(&port->dev); 583 } 584 585 /** 586 * zfcp_fc_test_link - lightweight link test procedure 587 * @port: port to be tested 588 * 589 * Test status of a link to a remote port using the ELS command ADISC. 590 * If there is a problem with the remote port, error recovery steps 591 * will be triggered. 592 */ 593 void zfcp_fc_test_link(struct zfcp_port *port) 594 { 595 get_device(&port->dev); 596 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 597 put_device(&port->dev); 598 } 599 600 /** 601 * zfcp_fc_sg_free_table - free memory used by scatterlists 602 * @sg: pointer to scatterlist 603 * @count: number of scatterlist which are to be free'ed 604 * the scatterlist are expected to reference pages always 605 */ 606 static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count) 607 { 608 int i; 609 610 for (i = 0; i < count; i++, sg++) 611 if (sg) 612 free_page((unsigned long) sg_virt(sg)); 613 else 614 break; 615 } 616 617 /** 618 * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers 619 * @sg: pointer to struct scatterlist 620 * @count: number of scatterlists which should be assigned with buffers 621 * of size page 622 * 623 * Returns: 0 on success, -ENOMEM otherwise 624 */ 625 static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count) 626 { 627 void *addr; 628 int i; 629 630 sg_init_table(sg, count); 631 for (i = 0; i < count; i++, sg++) { 632 addr = (void *) get_zeroed_page(GFP_KERNEL); 633 if (!addr) { 634 zfcp_fc_sg_free_table(sg, i); 635 return -ENOMEM; 636 } 637 sg_set_buf(sg, addr, PAGE_SIZE); 638 } 639 return 0; 640 } 641 642 static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num) 643 { 644 struct zfcp_fc_req *fc_req; 645 646 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 647 if (!fc_req) 648 return NULL; 649 650 if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 651 kmem_cache_free(zfcp_fc_req_cache, fc_req); 652 return NULL; 653 } 654 655 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 656 sizeof(struct zfcp_fc_gpn_ft_req)); 657 658 return fc_req; 659 } 660 661 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 662 struct zfcp_adapter *adapter, int max_bytes) 663 { 664 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 665 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 666 DECLARE_COMPLETION_ONSTACK(completion); 667 int ret; 668 669 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 670 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 671 672 ct_els->handler = zfcp_fc_complete; 673 ct_els->handler_data = &completion; 674 ct_els->req = &fc_req->sg_req; 675 ct_els->resp = &fc_req->sg_rsp; 676 677 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 678 ZFCP_FC_CTELS_TMO); 679 if (!ret) 680 wait_for_completion(&completion); 681 return ret; 682 } 683 684 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 685 { 686 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 687 return; 688 689 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 690 691 if ((port->supported_classes != 0) || 692 !list_empty(&port->unit_list)) 693 return; 694 695 list_move_tail(&port->list, lh); 696 } 697 698 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 699 struct zfcp_adapter *adapter, int max_entries) 700 { 701 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 702 struct scatterlist *sg = &fc_req->sg_rsp; 703 struct fc_ct_hdr *hdr = sg_virt(sg); 704 struct fc_gpn_ft_resp *acc = sg_virt(sg); 705 struct zfcp_port *port, *tmp; 706 unsigned long flags; 707 LIST_HEAD(remove_lh); 708 u32 d_id; 709 int ret = 0, x, last = 0; 710 711 if (ct_els->status) 712 return -EIO; 713 714 if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { 715 if (hdr->ct_reason == FC_FS_RJT_UNABL) 716 return -EAGAIN; /* might be a temporary condition */ 717 return -EIO; 718 } 719 720 if (hdr->ct_mr_size) { 721 dev_warn(&adapter->ccw_device->dev, 722 "The name server reported %d words residual data\n", 723 hdr->ct_mr_size); 724 return -E2BIG; 725 } 726 727 /* first entry is the header */ 728 for (x = 1; x < max_entries && !last; x++) { 729 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 730 acc++; 731 else 732 acc = sg_virt(++sg); 733 734 last = acc->fp_flags & FC_NS_FID_LAST; 735 d_id = ntoh24(acc->fp_fid); 736 737 /* don't attach ports with a well known address */ 738 if (d_id >= FC_FID_WELL_KNOWN_BASE) 739 continue; 740 /* skip the adapter's port and known remote ports */ 741 if (be64_to_cpu(acc->fp_wwpn) == 742 fc_host_port_name(adapter->scsi_host)) 743 continue; 744 745 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), 746 ZFCP_STATUS_COMMON_NOESC, d_id); 747 if (!IS_ERR(port)) 748 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 749 else if (PTR_ERR(port) != -EEXIST) 750 ret = PTR_ERR(port); 751 } 752 753 zfcp_erp_wait(adapter); 754 write_lock_irqsave(&adapter->port_list_lock, flags); 755 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 756 zfcp_fc_validate_port(port, &remove_lh); 757 write_unlock_irqrestore(&adapter->port_list_lock, flags); 758 759 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 760 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 761 device_unregister(&port->dev); 762 } 763 764 return ret; 765 } 766 767 /** 768 * zfcp_fc_scan_ports - scan remote ports and attach new ports 769 * @work: reference to scheduled work 770 */ 771 void zfcp_fc_scan_ports(struct work_struct *work) 772 { 773 struct delayed_work *dw = to_delayed_work(work); 774 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 775 scan_work); 776 int ret, i; 777 struct zfcp_fc_req *fc_req; 778 int chain, max_entries, buf_num, max_bytes; 779 780 zfcp_fc_port_scan_time(adapter); 781 782 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 783 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 784 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 785 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 786 787 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 788 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 789 return; 790 791 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 792 return; 793 794 fc_req = zfcp_fc_alloc_sg_env(buf_num); 795 if (!fc_req) 796 goto out; 797 798 for (i = 0; i < 3; i++) { 799 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 800 if (!ret) { 801 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 802 if (ret == -EAGAIN) 803 ssleep(1); 804 else 805 break; 806 } 807 } 808 zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num); 809 kmem_cache_free(zfcp_fc_req_cache, fc_req); 810 out: 811 zfcp_fc_wka_port_put(&adapter->gs->ds); 812 } 813 814 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 815 struct zfcp_fc_req *fc_req) 816 { 817 DECLARE_COMPLETION_ONSTACK(completion); 818 char devno[] = "DEVNO:"; 819 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 820 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 821 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 822 int ret; 823 824 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 825 FC_SYMBOLIC_NAME_SIZE); 826 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 827 828 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 829 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 830 831 ct_els->handler = zfcp_fc_complete; 832 ct_els->handler_data = &completion; 833 ct_els->req = &fc_req->sg_req; 834 ct_els->resp = &fc_req->sg_rsp; 835 836 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 837 ZFCP_FC_CTELS_TMO); 838 if (ret) 839 return ret; 840 841 wait_for_completion(&completion); 842 if (ct_els->status) 843 return ct_els->status; 844 845 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 846 !(strstr(gspn_rsp->gspn.fp_name, devno))) 847 snprintf(fc_host_symbolic_name(adapter->scsi_host), 848 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 849 gspn_rsp->gspn.fp_name, devno, 850 dev_name(&adapter->ccw_device->dev), 851 init_utsname()->nodename); 852 else 853 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 854 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 855 856 return 0; 857 } 858 859 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 860 struct zfcp_fc_req *fc_req) 861 { 862 DECLARE_COMPLETION_ONSTACK(completion); 863 struct Scsi_Host *shost = adapter->scsi_host; 864 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 865 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 866 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 867 int ret, len; 868 869 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 870 FC_SYMBOLIC_NAME_SIZE); 871 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 872 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 873 FC_SYMBOLIC_NAME_SIZE); 874 rspn_req->rspn.fr_name_len = len; 875 876 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 877 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 878 879 ct_els->handler = zfcp_fc_complete; 880 ct_els->handler_data = &completion; 881 ct_els->req = &fc_req->sg_req; 882 ct_els->resp = &fc_req->sg_rsp; 883 884 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 885 ZFCP_FC_CTELS_TMO); 886 if (!ret) 887 wait_for_completion(&completion); 888 } 889 890 /** 891 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 892 * @work: ns_up_work of the adapter where to update the symbolic port name 893 * 894 * Retrieve the current symbolic port name that may have been set by 895 * the hardware using the GSPN request and update the fc_host 896 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 897 * the port name is unique for this system), update the symbolic port 898 * name to add Linux specific information and update the FC nameserver 899 * using the RSPN request. 900 */ 901 void zfcp_fc_sym_name_update(struct work_struct *work) 902 { 903 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 904 ns_up_work); 905 int ret; 906 struct zfcp_fc_req *fc_req; 907 908 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 909 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 910 return; 911 912 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 913 if (!fc_req) 914 return; 915 916 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 917 if (ret) 918 goto out_free; 919 920 ret = zfcp_fc_gspn(adapter, fc_req); 921 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 922 goto out_ds_put; 923 924 memset(fc_req, 0, sizeof(*fc_req)); 925 zfcp_fc_rspn(adapter, fc_req); 926 927 out_ds_put: 928 zfcp_fc_wka_port_put(&adapter->gs->ds); 929 out_free: 930 kmem_cache_free(zfcp_fc_req_cache, fc_req); 931 } 932 933 static void zfcp_fc_ct_els_job_handler(void *data) 934 { 935 struct bsg_job *job = data; 936 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 937 struct fc_bsg_reply *jr = job->reply; 938 939 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 940 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 941 jr->result = zfcp_ct_els->status ? -EIO : 0; 942 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 943 } 944 945 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 946 { 947 u32 preamble_word1; 948 u8 gs_type; 949 struct zfcp_adapter *adapter; 950 struct fc_bsg_request *bsg_request = job->request; 951 struct fc_rport *rport = fc_bsg_to_rport(job); 952 struct Scsi_Host *shost; 953 954 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 955 gs_type = (preamble_word1 & 0xff000000) >> 24; 956 957 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 958 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 959 960 switch (gs_type) { 961 case FC_FST_ALIAS: 962 return &adapter->gs->as; 963 case FC_FST_MGMT: 964 return &adapter->gs->ms; 965 case FC_FST_TIME: 966 return &adapter->gs->ts; 967 break; 968 case FC_FST_DIR: 969 return &adapter->gs->ds; 970 break; 971 default: 972 return NULL; 973 } 974 } 975 976 static void zfcp_fc_ct_job_handler(void *data) 977 { 978 struct bsg_job *job = data; 979 struct zfcp_fc_wka_port *wka_port; 980 981 wka_port = zfcp_fc_job_wka_port(job); 982 zfcp_fc_wka_port_put(wka_port); 983 984 zfcp_fc_ct_els_job_handler(data); 985 } 986 987 static int zfcp_fc_exec_els_job(struct bsg_job *job, 988 struct zfcp_adapter *adapter) 989 { 990 struct zfcp_fsf_ct_els *els = job->dd_data; 991 struct fc_rport *rport = fc_bsg_to_rport(job); 992 struct fc_bsg_request *bsg_request = job->request; 993 struct zfcp_port *port; 994 u32 d_id; 995 996 if (rport) { 997 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 998 if (!port) 999 return -EINVAL; 1000 1001 d_id = port->d_id; 1002 put_device(&port->dev); 1003 } else 1004 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 1005 1006 els->handler = zfcp_fc_ct_els_job_handler; 1007 return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ); 1008 } 1009 1010 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 1011 struct zfcp_adapter *adapter) 1012 { 1013 int ret; 1014 struct zfcp_fsf_ct_els *ct = job->dd_data; 1015 struct zfcp_fc_wka_port *wka_port; 1016 1017 wka_port = zfcp_fc_job_wka_port(job); 1018 if (!wka_port) 1019 return -EINVAL; 1020 1021 ret = zfcp_fc_wka_port_get(wka_port); 1022 if (ret) 1023 return ret; 1024 1025 ct->handler = zfcp_fc_ct_job_handler; 1026 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ); 1027 if (ret) 1028 zfcp_fc_wka_port_put(wka_port); 1029 1030 return ret; 1031 } 1032 1033 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 1034 { 1035 struct Scsi_Host *shost; 1036 struct zfcp_adapter *adapter; 1037 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 1038 struct fc_bsg_request *bsg_request = job->request; 1039 struct fc_rport *rport = fc_bsg_to_rport(job); 1040 1041 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 1042 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 1043 1044 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 1045 return -EINVAL; 1046 1047 ct_els->req = job->request_payload.sg_list; 1048 ct_els->resp = job->reply_payload.sg_list; 1049 ct_els->handler_data = job; 1050 1051 switch (bsg_request->msgcode) { 1052 case FC_BSG_RPT_ELS: 1053 case FC_BSG_HST_ELS_NOLOGIN: 1054 return zfcp_fc_exec_els_job(job, adapter); 1055 case FC_BSG_RPT_CT: 1056 case FC_BSG_HST_CT: 1057 return zfcp_fc_exec_ct_job(job, adapter); 1058 default: 1059 return -EINVAL; 1060 } 1061 } 1062 1063 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1064 { 1065 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1066 return -EAGAIN; 1067 } 1068 1069 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1070 { 1071 struct zfcp_fc_wka_ports *wka_ports; 1072 1073 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1074 if (!wka_ports) 1075 return -ENOMEM; 1076 1077 adapter->gs = wka_ports; 1078 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1079 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1080 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1081 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1082 1083 return 0; 1084 } 1085 1086 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1087 { 1088 kfree(adapter->gs); 1089 adapter->gs = NULL; 1090 } 1091 1092