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 /** 122 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 123 * @adapter: The adapter where to enqueue the event 124 * @event_code: The event code (as defined in fc_host_event_code in 125 * scsi_transport_fc.h) 126 * @event_data: The event data (e.g. n_port page in case of els) 127 */ 128 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 129 enum fc_host_event_code event_code, u32 event_data) 130 { 131 struct zfcp_fc_event *event; 132 133 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 134 if (!event) 135 return; 136 137 event->code = event_code; 138 event->data = event_data; 139 140 spin_lock(&adapter->events.list_lock); 141 list_add_tail(&event->list, &adapter->events.list); 142 spin_unlock(&adapter->events.list_lock); 143 144 queue_work(adapter->work_queue, &adapter->events.work); 145 } 146 147 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 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 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 157 } 158 159 mutex_unlock(&wka_port->mutex); 160 161 wait_event(wka_port->completion_wq, 162 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 163 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 164 165 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 166 atomic_inc(&wka_port->refcount); 167 return 0; 168 } 169 return -EIO; 170 } 171 172 static void zfcp_fc_wka_port_offline(struct work_struct *work) 173 { 174 struct delayed_work *dw = to_delayed_work(work); 175 struct zfcp_fc_wka_port *wka_port = 176 container_of(dw, struct zfcp_fc_wka_port, work); 177 178 mutex_lock(&wka_port->mutex); 179 if ((atomic_read(&wka_port->refcount) != 0) || 180 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 181 goto out; 182 183 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 184 if (zfcp_fsf_close_wka_port(wka_port)) { 185 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 186 wake_up(&wka_port->completion_wq); 187 } 188 out: 189 mutex_unlock(&wka_port->mutex); 190 } 191 192 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 193 { 194 if (atomic_dec_return(&wka_port->refcount) != 0) 195 return; 196 /* wait 10 milliseconds, other reqs might pop in */ 197 schedule_delayed_work(&wka_port->work, HZ / 100); 198 } 199 200 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 201 struct zfcp_adapter *adapter) 202 { 203 init_waitqueue_head(&wka_port->completion_wq); 204 205 wka_port->adapter = adapter; 206 wka_port->d_id = d_id; 207 208 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 209 atomic_set(&wka_port->refcount, 0); 210 mutex_init(&wka_port->mutex); 211 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 212 } 213 214 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 215 { 216 cancel_delayed_work_sync(&wka->work); 217 mutex_lock(&wka->mutex); 218 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 219 mutex_unlock(&wka->mutex); 220 } 221 222 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 223 { 224 if (!gs) 225 return; 226 zfcp_fc_wka_port_force_offline(&gs->ms); 227 zfcp_fc_wka_port_force_offline(&gs->ts); 228 zfcp_fc_wka_port_force_offline(&gs->ds); 229 zfcp_fc_wka_port_force_offline(&gs->as); 230 } 231 232 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 233 struct fc_els_rscn_page *page) 234 { 235 unsigned long flags; 236 struct zfcp_adapter *adapter = fsf_req->adapter; 237 struct zfcp_port *port; 238 239 read_lock_irqsave(&adapter->port_list_lock, flags); 240 list_for_each_entry(port, &adapter->port_list, list) { 241 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 242 zfcp_fc_test_link(port); 243 if (!port->d_id) 244 zfcp_erp_port_reopen(port, 245 ZFCP_STATUS_COMMON_ERP_FAILED, 246 "fcrscn1"); 247 } 248 read_unlock_irqrestore(&adapter->port_list_lock, flags); 249 } 250 251 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 252 { 253 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 254 struct fc_els_rscn *head; 255 struct fc_els_rscn_page *page; 256 u16 i; 257 u16 no_entries; 258 unsigned int afmt; 259 260 head = (struct fc_els_rscn *) status_buffer->payload.data; 261 page = (struct fc_els_rscn_page *) head; 262 263 /* see FC-FS */ 264 no_entries = be16_to_cpu(head->rscn_plen) / 265 sizeof(struct fc_els_rscn_page); 266 267 for (i = 1; i < no_entries; i++) { 268 /* skip head and start with 1st element */ 269 page++; 270 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; 271 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], 272 page); 273 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, 274 *(u32 *)page); 275 } 276 zfcp_fc_conditional_port_scan(fsf_req->adapter); 277 } 278 279 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) 280 { 281 unsigned long flags; 282 struct zfcp_adapter *adapter = req->adapter; 283 struct zfcp_port *port; 284 285 read_lock_irqsave(&adapter->port_list_lock, flags); 286 list_for_each_entry(port, &adapter->port_list, list) 287 if (port->wwpn == wwpn) { 288 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); 289 break; 290 } 291 read_unlock_irqrestore(&adapter->port_list_lock, flags); 292 } 293 294 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) 295 { 296 struct fsf_status_read_buffer *status_buffer; 297 struct fc_els_flogi *plogi; 298 299 status_buffer = (struct fsf_status_read_buffer *) req->data; 300 plogi = (struct fc_els_flogi *) status_buffer->payload.data; 301 zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); 302 } 303 304 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) 305 { 306 struct fsf_status_read_buffer *status_buffer = 307 (struct fsf_status_read_buffer *)req->data; 308 struct fc_els_logo *logo = 309 (struct fc_els_logo *) status_buffer->payload.data; 310 311 zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); 312 } 313 314 /** 315 * zfcp_fc_incoming_els - handle incoming ELS 316 * @fsf_req - request which contains incoming ELS 317 */ 318 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) 319 { 320 struct fsf_status_read_buffer *status_buffer = 321 (struct fsf_status_read_buffer *) fsf_req->data; 322 unsigned int els_type = status_buffer->payload.data[0]; 323 324 zfcp_dbf_san_in_els("fciels1", fsf_req); 325 if (els_type == ELS_PLOGI) 326 zfcp_fc_incoming_plogi(fsf_req); 327 else if (els_type == ELS_LOGO) 328 zfcp_fc_incoming_logo(fsf_req); 329 else if (els_type == ELS_RSCN) 330 zfcp_fc_incoming_rscn(fsf_req); 331 } 332 333 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) 334 { 335 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 336 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 337 338 if (ct_els->status) 339 return; 340 if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) 341 return; 342 343 /* looks like a valid d_id */ 344 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); 345 } 346 347 static void zfcp_fc_complete(void *data) 348 { 349 complete(data); 350 } 351 352 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) 353 { 354 ct_hdr->ct_rev = FC_CT_REV; 355 ct_hdr->ct_fs_type = FC_FST_DIR; 356 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; 357 ct_hdr->ct_cmd = cpu_to_be16(cmd); 358 ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); 359 } 360 361 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, 362 struct zfcp_fc_req *fc_req) 363 { 364 struct zfcp_adapter *adapter = port->adapter; 365 DECLARE_COMPLETION_ONSTACK(completion); 366 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; 367 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; 368 int ret; 369 370 /* setup parameters for send generic command */ 371 fc_req->ct_els.port = port; 372 fc_req->ct_els.handler = zfcp_fc_complete; 373 fc_req->ct_els.handler_data = &completion; 374 fc_req->ct_els.req = &fc_req->sg_req; 375 fc_req->ct_els.resp = &fc_req->sg_rsp; 376 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); 377 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); 378 379 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, 380 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); 381 gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); 382 383 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, 384 adapter->pool.gid_pn_req, 385 ZFCP_FC_CTELS_TMO); 386 if (!ret) { 387 wait_for_completion(&completion); 388 zfcp_fc_ns_gid_pn_eval(fc_req); 389 } 390 return ret; 391 } 392 393 /** 394 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request 395 * @port: port where GID_PN request is needed 396 * return: -ENOMEM on error, 0 otherwise 397 */ 398 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) 399 { 400 int ret; 401 struct zfcp_fc_req *fc_req; 402 struct zfcp_adapter *adapter = port->adapter; 403 404 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); 405 if (!fc_req) 406 return -ENOMEM; 407 408 memset(fc_req, 0, sizeof(*fc_req)); 409 410 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 411 if (ret) 412 goto out; 413 414 ret = zfcp_fc_ns_gid_pn_request(port, fc_req); 415 416 zfcp_fc_wka_port_put(&adapter->gs->ds); 417 out: 418 mempool_free(fc_req, adapter->pool.gid_pn); 419 return ret; 420 } 421 422 void zfcp_fc_port_did_lookup(struct work_struct *work) 423 { 424 int ret; 425 struct zfcp_port *port = container_of(work, struct zfcp_port, 426 gid_pn_work); 427 428 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 get_device(&port->dev); 563 port->rport_task = RPORT_DEL; 564 zfcp_scsi_rport_work(&port->rport_work); 565 566 /* only issue one test command at one time per port */ 567 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 568 goto out; 569 570 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 571 572 retval = zfcp_fc_adisc(port); 573 if (retval == 0) 574 return; 575 576 /* send of ADISC was not possible */ 577 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 578 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 579 580 out: 581 put_device(&port->dev); 582 } 583 584 /** 585 * zfcp_fc_test_link - lightweight link test procedure 586 * @port: port to be tested 587 * 588 * Test status of a link to a remote port using the ELS command ADISC. 589 * If there is a problem with the remote port, error recovery steps 590 * will be triggered. 591 */ 592 void zfcp_fc_test_link(struct zfcp_port *port) 593 { 594 get_device(&port->dev); 595 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 596 put_device(&port->dev); 597 } 598 599 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) 600 { 601 struct zfcp_fc_req *fc_req; 602 603 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 604 if (!fc_req) 605 return NULL; 606 607 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 608 kmem_cache_free(zfcp_fc_req_cache, fc_req); 609 return NULL; 610 } 611 612 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 613 sizeof(struct zfcp_fc_gpn_ft_req)); 614 615 return fc_req; 616 } 617 618 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 619 struct zfcp_adapter *adapter, int max_bytes) 620 { 621 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 622 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 623 DECLARE_COMPLETION_ONSTACK(completion); 624 int ret; 625 626 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 627 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 628 629 ct_els->handler = zfcp_fc_complete; 630 ct_els->handler_data = &completion; 631 ct_els->req = &fc_req->sg_req; 632 ct_els->resp = &fc_req->sg_rsp; 633 634 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 635 ZFCP_FC_CTELS_TMO); 636 if (!ret) 637 wait_for_completion(&completion); 638 return ret; 639 } 640 641 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 642 { 643 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 644 return; 645 646 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 647 648 if ((port->supported_classes != 0) || 649 !list_empty(&port->unit_list)) 650 return; 651 652 list_move_tail(&port->list, lh); 653 } 654 655 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 656 struct zfcp_adapter *adapter, int max_entries) 657 { 658 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 659 struct scatterlist *sg = &fc_req->sg_rsp; 660 struct fc_ct_hdr *hdr = sg_virt(sg); 661 struct fc_gpn_ft_resp *acc = sg_virt(sg); 662 struct zfcp_port *port, *tmp; 663 unsigned long flags; 664 LIST_HEAD(remove_lh); 665 u32 d_id; 666 int ret = 0, x, last = 0; 667 668 if (ct_els->status) 669 return -EIO; 670 671 if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { 672 if (hdr->ct_reason == FC_FS_RJT_UNABL) 673 return -EAGAIN; /* might be a temporary condition */ 674 return -EIO; 675 } 676 677 if (hdr->ct_mr_size) { 678 dev_warn(&adapter->ccw_device->dev, 679 "The name server reported %d words residual data\n", 680 hdr->ct_mr_size); 681 return -E2BIG; 682 } 683 684 /* first entry is the header */ 685 for (x = 1; x < max_entries && !last; x++) { 686 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 687 acc++; 688 else 689 acc = sg_virt(++sg); 690 691 last = acc->fp_flags & FC_NS_FID_LAST; 692 d_id = ntoh24(acc->fp_fid); 693 694 /* don't attach ports with a well known address */ 695 if (d_id >= FC_FID_WELL_KNOWN_BASE) 696 continue; 697 /* skip the adapter's port and known remote ports */ 698 if (be64_to_cpu(acc->fp_wwpn) == 699 fc_host_port_name(adapter->scsi_host)) 700 continue; 701 702 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), 703 ZFCP_STATUS_COMMON_NOESC, d_id); 704 if (!IS_ERR(port)) 705 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 706 else if (PTR_ERR(port) != -EEXIST) 707 ret = PTR_ERR(port); 708 } 709 710 zfcp_erp_wait(adapter); 711 write_lock_irqsave(&adapter->port_list_lock, flags); 712 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 713 zfcp_fc_validate_port(port, &remove_lh); 714 write_unlock_irqrestore(&adapter->port_list_lock, flags); 715 716 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 717 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 718 device_unregister(&port->dev); 719 } 720 721 return ret; 722 } 723 724 /** 725 * zfcp_fc_scan_ports - scan remote ports and attach new ports 726 * @work: reference to scheduled work 727 */ 728 void zfcp_fc_scan_ports(struct work_struct *work) 729 { 730 struct delayed_work *dw = to_delayed_work(work); 731 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 732 scan_work); 733 int ret, i; 734 struct zfcp_fc_req *fc_req; 735 int chain, max_entries, buf_num, max_bytes; 736 737 zfcp_fc_port_scan_time(adapter); 738 739 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 740 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 741 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 742 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 743 744 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 745 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 746 return; 747 748 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 749 return; 750 751 fc_req = zfcp_alloc_sg_env(buf_num); 752 if (!fc_req) 753 goto out; 754 755 for (i = 0; i < 3; i++) { 756 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 757 if (!ret) { 758 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 759 if (ret == -EAGAIN) 760 ssleep(1); 761 else 762 break; 763 } 764 } 765 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); 766 kmem_cache_free(zfcp_fc_req_cache, fc_req); 767 out: 768 zfcp_fc_wka_port_put(&adapter->gs->ds); 769 } 770 771 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 772 struct zfcp_fc_req *fc_req) 773 { 774 DECLARE_COMPLETION_ONSTACK(completion); 775 char devno[] = "DEVNO:"; 776 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 777 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 778 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 779 int ret; 780 781 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 782 FC_SYMBOLIC_NAME_SIZE); 783 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 784 785 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 786 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 787 788 ct_els->handler = zfcp_fc_complete; 789 ct_els->handler_data = &completion; 790 ct_els->req = &fc_req->sg_req; 791 ct_els->resp = &fc_req->sg_rsp; 792 793 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 794 ZFCP_FC_CTELS_TMO); 795 if (ret) 796 return ret; 797 798 wait_for_completion(&completion); 799 if (ct_els->status) 800 return ct_els->status; 801 802 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 803 !(strstr(gspn_rsp->gspn.fp_name, devno))) 804 snprintf(fc_host_symbolic_name(adapter->scsi_host), 805 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 806 gspn_rsp->gspn.fp_name, devno, 807 dev_name(&adapter->ccw_device->dev), 808 init_utsname()->nodename); 809 else 810 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 811 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 812 813 return 0; 814 } 815 816 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 817 struct zfcp_fc_req *fc_req) 818 { 819 DECLARE_COMPLETION_ONSTACK(completion); 820 struct Scsi_Host *shost = adapter->scsi_host; 821 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 822 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 823 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 824 int ret, len; 825 826 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 827 FC_SYMBOLIC_NAME_SIZE); 828 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 829 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 830 FC_SYMBOLIC_NAME_SIZE); 831 rspn_req->rspn.fr_name_len = len; 832 833 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 834 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 835 836 ct_els->handler = zfcp_fc_complete; 837 ct_els->handler_data = &completion; 838 ct_els->req = &fc_req->sg_req; 839 ct_els->resp = &fc_req->sg_rsp; 840 841 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 842 ZFCP_FC_CTELS_TMO); 843 if (!ret) 844 wait_for_completion(&completion); 845 } 846 847 /** 848 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 849 * @work: ns_up_work of the adapter where to update the symbolic port name 850 * 851 * Retrieve the current symbolic port name that may have been set by 852 * the hardware using the GSPN request and update the fc_host 853 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 854 * the port name is unique for this system), update the symbolic port 855 * name to add Linux specific information and update the FC nameserver 856 * using the RSPN request. 857 */ 858 void zfcp_fc_sym_name_update(struct work_struct *work) 859 { 860 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 861 ns_up_work); 862 int ret; 863 struct zfcp_fc_req *fc_req; 864 865 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 866 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 867 return; 868 869 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 870 if (!fc_req) 871 return; 872 873 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 874 if (ret) 875 goto out_free; 876 877 ret = zfcp_fc_gspn(adapter, fc_req); 878 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 879 goto out_ds_put; 880 881 memset(fc_req, 0, sizeof(*fc_req)); 882 zfcp_fc_rspn(adapter, fc_req); 883 884 out_ds_put: 885 zfcp_fc_wka_port_put(&adapter->gs->ds); 886 out_free: 887 kmem_cache_free(zfcp_fc_req_cache, fc_req); 888 } 889 890 static void zfcp_fc_ct_els_job_handler(void *data) 891 { 892 struct bsg_job *job = data; 893 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 894 struct fc_bsg_reply *jr = job->reply; 895 896 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 897 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 898 jr->result = zfcp_ct_els->status ? -EIO : 0; 899 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 900 } 901 902 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 903 { 904 u32 preamble_word1; 905 u8 gs_type; 906 struct zfcp_adapter *adapter; 907 struct fc_bsg_request *bsg_request = job->request; 908 struct fc_rport *rport = fc_bsg_to_rport(job); 909 struct Scsi_Host *shost; 910 911 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 912 gs_type = (preamble_word1 & 0xff000000) >> 24; 913 914 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 915 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 916 917 switch (gs_type) { 918 case FC_FST_ALIAS: 919 return &adapter->gs->as; 920 case FC_FST_MGMT: 921 return &adapter->gs->ms; 922 case FC_FST_TIME: 923 return &adapter->gs->ts; 924 break; 925 case FC_FST_DIR: 926 return &adapter->gs->ds; 927 break; 928 default: 929 return NULL; 930 } 931 } 932 933 static void zfcp_fc_ct_job_handler(void *data) 934 { 935 struct bsg_job *job = data; 936 struct zfcp_fc_wka_port *wka_port; 937 938 wka_port = zfcp_fc_job_wka_port(job); 939 zfcp_fc_wka_port_put(wka_port); 940 941 zfcp_fc_ct_els_job_handler(data); 942 } 943 944 static int zfcp_fc_exec_els_job(struct bsg_job *job, 945 struct zfcp_adapter *adapter) 946 { 947 struct zfcp_fsf_ct_els *els = job->dd_data; 948 struct fc_rport *rport = fc_bsg_to_rport(job); 949 struct fc_bsg_request *bsg_request = job->request; 950 struct zfcp_port *port; 951 u32 d_id; 952 953 if (rport) { 954 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 955 if (!port) 956 return -EINVAL; 957 958 d_id = port->d_id; 959 put_device(&port->dev); 960 } else 961 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 962 963 els->handler = zfcp_fc_ct_els_job_handler; 964 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 965 } 966 967 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 968 struct zfcp_adapter *adapter) 969 { 970 int ret; 971 struct zfcp_fsf_ct_els *ct = job->dd_data; 972 struct zfcp_fc_wka_port *wka_port; 973 974 wka_port = zfcp_fc_job_wka_port(job); 975 if (!wka_port) 976 return -EINVAL; 977 978 ret = zfcp_fc_wka_port_get(wka_port); 979 if (ret) 980 return ret; 981 982 ct->handler = zfcp_fc_ct_job_handler; 983 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 984 if (ret) 985 zfcp_fc_wka_port_put(wka_port); 986 987 return ret; 988 } 989 990 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 991 { 992 struct Scsi_Host *shost; 993 struct zfcp_adapter *adapter; 994 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 995 struct fc_bsg_request *bsg_request = job->request; 996 struct fc_rport *rport = fc_bsg_to_rport(job); 997 998 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 999 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 1000 1001 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 1002 return -EINVAL; 1003 1004 ct_els->req = job->request_payload.sg_list; 1005 ct_els->resp = job->reply_payload.sg_list; 1006 ct_els->handler_data = job; 1007 1008 switch (bsg_request->msgcode) { 1009 case FC_BSG_RPT_ELS: 1010 case FC_BSG_HST_ELS_NOLOGIN: 1011 return zfcp_fc_exec_els_job(job, adapter); 1012 case FC_BSG_RPT_CT: 1013 case FC_BSG_HST_CT: 1014 return zfcp_fc_exec_ct_job(job, adapter); 1015 default: 1016 return -EINVAL; 1017 } 1018 } 1019 1020 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1021 { 1022 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1023 return -EAGAIN; 1024 } 1025 1026 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1027 { 1028 struct zfcp_fc_wka_ports *wka_ports; 1029 1030 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1031 if (!wka_ports) 1032 return -ENOMEM; 1033 1034 adapter->gs = wka_ports; 1035 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1036 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1037 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1038 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1039 1040 return 0; 1041 } 1042 1043 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1044 { 1045 kfree(adapter->gs); 1046 adapter->gs = NULL; 1047 } 1048 1049