1 /* 2 * zfcp device driver 3 * 4 * Fibre Channel related functions for the zfcp device driver. 5 * 6 * Copyright IBM Corp. 2008, 2017 7 */ 8 9 #define KMSG_COMPONENT "zfcp" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/utsname.h> 15 #include <linux/random.h> 16 #include <linux/bsg-lib.h> 17 #include <scsi/fc/fc_els.h> 18 #include <scsi/libfc.h> 19 #include "zfcp_ext.h" 20 #include "zfcp_fc.h" 21 22 struct kmem_cache *zfcp_fc_req_cache; 23 24 static u32 zfcp_fc_rscn_range_mask[] = { 25 [ELS_ADDR_FMT_PORT] = 0xFFFFFF, 26 [ELS_ADDR_FMT_AREA] = 0xFFFF00, 27 [ELS_ADDR_FMT_DOM] = 0xFF0000, 28 [ELS_ADDR_FMT_FAB] = 0x000000, 29 }; 30 31 static bool no_auto_port_rescan; 32 module_param(no_auto_port_rescan, bool, 0600); 33 MODULE_PARM_DESC(no_auto_port_rescan, 34 "no automatic port_rescan (default off)"); 35 36 static unsigned int port_scan_backoff = 500; 37 module_param(port_scan_backoff, uint, 0600); 38 MODULE_PARM_DESC(port_scan_backoff, 39 "upper limit of port scan random backoff in msecs (default 500)"); 40 41 static unsigned int port_scan_ratelimit = 60000; 42 module_param(port_scan_ratelimit, uint, 0600); 43 MODULE_PARM_DESC(port_scan_ratelimit, 44 "minimum interval between port scans in msecs (default 60000)"); 45 46 unsigned int zfcp_fc_port_scan_backoff(void) 47 { 48 if (!port_scan_backoff) 49 return 0; 50 return get_random_int() % port_scan_backoff; 51 } 52 53 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) 54 { 55 unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); 56 unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); 57 58 adapter->next_port_scan = jiffies + interval + backoff; 59 } 60 61 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) 62 { 63 unsigned long now = jiffies; 64 unsigned long next = adapter->next_port_scan; 65 unsigned long delay = 0, max; 66 67 /* delay only needed within waiting period */ 68 if (time_before(now, next)) { 69 delay = next - now; 70 /* paranoia: never ever delay scans longer than specified */ 71 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); 72 delay = min(delay, max); 73 } 74 75 queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); 76 } 77 78 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) 79 { 80 if (no_auto_port_rescan) 81 return; 82 83 zfcp_fc_port_scan(adapter); 84 } 85 86 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) 87 { 88 if (!no_auto_port_rescan) 89 return; 90 91 zfcp_fc_port_scan(adapter); 92 } 93 94 /** 95 * zfcp_fc_post_event - post event to userspace via fc_transport 96 * @work: work struct with enqueued events 97 */ 98 void zfcp_fc_post_event(struct work_struct *work) 99 { 100 struct zfcp_fc_event *event = NULL, *tmp = NULL; 101 LIST_HEAD(tmp_lh); 102 struct zfcp_fc_events *events = container_of(work, 103 struct zfcp_fc_events, work); 104 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, 105 events); 106 107 spin_lock_bh(&events->list_lock); 108 list_splice_init(&events->list, &tmp_lh); 109 spin_unlock_bh(&events->list_lock); 110 111 list_for_each_entry_safe(event, tmp, &tmp_lh, list) { 112 fc_host_post_event(adapter->scsi_host, fc_get_event_number(), 113 event->code, event->data); 114 list_del(&event->list); 115 kfree(event); 116 } 117 118 } 119 120 /** 121 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context 122 * @adapter: The adapter where to enqueue the event 123 * @event_code: The event code (as defined in fc_host_event_code in 124 * scsi_transport_fc.h) 125 * @event_data: The event data (e.g. n_port page in case of els) 126 */ 127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, 128 enum fc_host_event_code event_code, u32 event_data) 129 { 130 struct zfcp_fc_event *event; 131 132 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); 133 if (!event) 134 return; 135 136 event->code = event_code; 137 event->data = event_data; 138 139 spin_lock(&adapter->events.list_lock); 140 list_add_tail(&event->list, &adapter->events.list); 141 spin_unlock(&adapter->events.list_lock); 142 143 queue_work(adapter->work_queue, &adapter->events.work); 144 } 145 146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) 147 { 148 if (mutex_lock_interruptible(&wka_port->mutex)) 149 return -ERESTARTSYS; 150 151 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || 152 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { 153 wka_port->status = ZFCP_FC_WKA_PORT_OPENING; 154 if (zfcp_fsf_open_wka_port(wka_port)) 155 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 156 } 157 158 mutex_unlock(&wka_port->mutex); 159 160 wait_event(wka_port->completion_wq, 161 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || 162 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); 163 164 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { 165 atomic_inc(&wka_port->refcount); 166 return 0; 167 } 168 return -EIO; 169 } 170 171 static void zfcp_fc_wka_port_offline(struct work_struct *work) 172 { 173 struct delayed_work *dw = to_delayed_work(work); 174 struct zfcp_fc_wka_port *wka_port = 175 container_of(dw, struct zfcp_fc_wka_port, work); 176 177 mutex_lock(&wka_port->mutex); 178 if ((atomic_read(&wka_port->refcount) != 0) || 179 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) 180 goto out; 181 182 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; 183 if (zfcp_fsf_close_wka_port(wka_port)) { 184 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 185 wake_up(&wka_port->completion_wq); 186 } 187 out: 188 mutex_unlock(&wka_port->mutex); 189 } 190 191 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) 192 { 193 if (atomic_dec_return(&wka_port->refcount) != 0) 194 return; 195 /* wait 10 milliseconds, other reqs might pop in */ 196 schedule_delayed_work(&wka_port->work, HZ / 100); 197 } 198 199 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, 200 struct zfcp_adapter *adapter) 201 { 202 init_waitqueue_head(&wka_port->completion_wq); 203 204 wka_port->adapter = adapter; 205 wka_port->d_id = d_id; 206 207 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; 208 atomic_set(&wka_port->refcount, 0); 209 mutex_init(&wka_port->mutex); 210 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); 211 } 212 213 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) 214 { 215 cancel_delayed_work_sync(&wka->work); 216 mutex_lock(&wka->mutex); 217 wka->status = ZFCP_FC_WKA_PORT_OFFLINE; 218 mutex_unlock(&wka->mutex); 219 } 220 221 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) 222 { 223 if (!gs) 224 return; 225 zfcp_fc_wka_port_force_offline(&gs->ms); 226 zfcp_fc_wka_port_force_offline(&gs->ts); 227 zfcp_fc_wka_port_force_offline(&gs->ds); 228 zfcp_fc_wka_port_force_offline(&gs->as); 229 } 230 231 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, 232 struct fc_els_rscn_page *page) 233 { 234 unsigned long flags; 235 struct zfcp_adapter *adapter = fsf_req->adapter; 236 struct zfcp_port *port; 237 238 read_lock_irqsave(&adapter->port_list_lock, flags); 239 list_for_each_entry(port, &adapter->port_list, list) { 240 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) 241 zfcp_fc_test_link(port); 242 if (!port->d_id) 243 zfcp_erp_port_reopen(port, 244 ZFCP_STATUS_COMMON_ERP_FAILED, 245 "fcrscn1"); 246 } 247 read_unlock_irqrestore(&adapter->port_list_lock, flags); 248 } 249 250 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 251 { 252 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; 253 struct fc_els_rscn *head; 254 struct fc_els_rscn_page *page; 255 u16 i; 256 u16 no_entries; 257 unsigned int afmt; 258 259 head = (struct fc_els_rscn *) status_buffer->payload.data; 260 page = (struct fc_els_rscn_page *) head; 261 262 /* see FC-FS */ 263 no_entries = 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 ret = zfcp_fc_ns_gid_pn(port); 428 if (ret) { 429 /* could not issue gid_pn for some reason */ 430 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); 431 goto out; 432 } 433 434 if (!port->d_id) { 435 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); 436 goto out; 437 } 438 439 zfcp_erp_port_reopen(port, 0, "fcgpn_3"); 440 out: 441 put_device(&port->dev); 442 } 443 444 /** 445 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request 446 * @port: The zfcp_port to lookup the d_id for. 447 */ 448 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) 449 { 450 get_device(&port->dev); 451 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) 452 put_device(&port->dev); 453 } 454 455 /** 456 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload 457 * @port: zfcp_port structure 458 * @plogi: plogi payload 459 * 460 * Evaluate PLOGI playload and copy important fields into zfcp_port structure 461 */ 462 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) 463 { 464 if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { 465 port->d_id = 0; 466 dev_warn(&port->adapter->ccw_device->dev, 467 "A port opened with WWPN 0x%016Lx returned data that " 468 "identifies it as WWPN 0x%016Lx\n", 469 (unsigned long long) port->wwpn, 470 (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); 471 return; 472 } 473 474 port->wwnn = be64_to_cpu(plogi->fl_wwnn); 475 port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); 476 477 if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) 478 port->supported_classes |= FC_COS_CLASS1; 479 if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) 480 port->supported_classes |= FC_COS_CLASS2; 481 if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) 482 port->supported_classes |= FC_COS_CLASS3; 483 if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) 484 port->supported_classes |= FC_COS_CLASS4; 485 } 486 487 static void zfcp_fc_adisc_handler(void *data) 488 { 489 struct zfcp_fc_req *fc_req = data; 490 struct zfcp_port *port = fc_req->ct_els.port; 491 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; 492 493 if (fc_req->ct_els.status) { 494 /* request rejected or timed out */ 495 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 496 "fcadh_1"); 497 goto out; 498 } 499 500 if (!port->wwnn) 501 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); 502 503 if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || 504 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { 505 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, 506 "fcadh_2"); 507 goto out; 508 } 509 510 /* port is good, unblock rport without going through erp */ 511 zfcp_scsi_schedule_rport_register(port); 512 out: 513 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 514 put_device(&port->dev); 515 kmem_cache_free(zfcp_fc_req_cache, fc_req); 516 } 517 518 static int zfcp_fc_adisc(struct zfcp_port *port) 519 { 520 struct zfcp_fc_req *fc_req; 521 struct zfcp_adapter *adapter = port->adapter; 522 struct Scsi_Host *shost = adapter->scsi_host; 523 int ret; 524 525 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); 526 if (!fc_req) 527 return -ENOMEM; 528 529 fc_req->ct_els.port = port; 530 fc_req->ct_els.req = &fc_req->sg_req; 531 fc_req->ct_els.resp = &fc_req->sg_rsp; 532 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, 533 sizeof(struct fc_els_adisc)); 534 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, 535 sizeof(struct fc_els_adisc)); 536 537 fc_req->ct_els.handler = zfcp_fc_adisc_handler; 538 fc_req->ct_els.handler_data = fc_req; 539 540 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports 541 without FC-AL-2 capability, so we don't set it */ 542 fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); 543 fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); 544 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; 545 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); 546 547 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els, 548 ZFCP_FC_CTELS_TMO); 549 if (ret) 550 kmem_cache_free(zfcp_fc_req_cache, fc_req); 551 552 return ret; 553 } 554 555 void zfcp_fc_link_test_work(struct work_struct *work) 556 { 557 struct zfcp_port *port = 558 container_of(work, struct zfcp_port, test_link_work); 559 int retval; 560 561 get_device(&port->dev); 562 port->rport_task = RPORT_DEL; 563 zfcp_scsi_rport_work(&port->rport_work); 564 565 /* only issue one test command at one time per port */ 566 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) 567 goto out; 568 569 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 570 571 retval = zfcp_fc_adisc(port); 572 if (retval == 0) 573 return; 574 575 /* send of ADISC was not possible */ 576 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); 577 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); 578 579 out: 580 put_device(&port->dev); 581 } 582 583 /** 584 * zfcp_fc_test_link - lightweight link test procedure 585 * @port: port to be tested 586 * 587 * Test status of a link to a remote port using the ELS command ADISC. 588 * If there is a problem with the remote port, error recovery steps 589 * will be triggered. 590 */ 591 void zfcp_fc_test_link(struct zfcp_port *port) 592 { 593 get_device(&port->dev); 594 if (!queue_work(port->adapter->work_queue, &port->test_link_work)) 595 put_device(&port->dev); 596 } 597 598 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num) 599 { 600 struct zfcp_fc_req *fc_req; 601 602 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 603 if (!fc_req) 604 return NULL; 605 606 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { 607 kmem_cache_free(zfcp_fc_req_cache, fc_req); 608 return NULL; 609 } 610 611 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, 612 sizeof(struct zfcp_fc_gpn_ft_req)); 613 614 return fc_req; 615 } 616 617 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, 618 struct zfcp_adapter *adapter, int max_bytes) 619 { 620 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 621 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; 622 DECLARE_COMPLETION_ONSTACK(completion); 623 int ret; 624 625 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); 626 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; 627 628 ct_els->handler = zfcp_fc_complete; 629 ct_els->handler_data = &completion; 630 ct_els->req = &fc_req->sg_req; 631 ct_els->resp = &fc_req->sg_rsp; 632 633 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 634 ZFCP_FC_CTELS_TMO); 635 if (!ret) 636 wait_for_completion(&completion); 637 return ret; 638 } 639 640 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) 641 { 642 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) 643 return; 644 645 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); 646 647 if ((port->supported_classes != 0) || 648 !list_empty(&port->unit_list)) 649 return; 650 651 list_move_tail(&port->list, lh); 652 } 653 654 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, 655 struct zfcp_adapter *adapter, int max_entries) 656 { 657 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 658 struct scatterlist *sg = &fc_req->sg_rsp; 659 struct fc_ct_hdr *hdr = sg_virt(sg); 660 struct fc_gpn_ft_resp *acc = sg_virt(sg); 661 struct zfcp_port *port, *tmp; 662 unsigned long flags; 663 LIST_HEAD(remove_lh); 664 u32 d_id; 665 int ret = 0, x, last = 0; 666 667 if (ct_els->status) 668 return -EIO; 669 670 if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { 671 if (hdr->ct_reason == FC_FS_RJT_UNABL) 672 return -EAGAIN; /* might be a temporary condition */ 673 return -EIO; 674 } 675 676 if (hdr->ct_mr_size) { 677 dev_warn(&adapter->ccw_device->dev, 678 "The name server reported %d words residual data\n", 679 hdr->ct_mr_size); 680 return -E2BIG; 681 } 682 683 /* first entry is the header */ 684 for (x = 1; x < max_entries && !last; x++) { 685 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 686 acc++; 687 else 688 acc = sg_virt(++sg); 689 690 last = acc->fp_flags & FC_NS_FID_LAST; 691 d_id = ntoh24(acc->fp_fid); 692 693 /* don't attach ports with a well known address */ 694 if (d_id >= FC_FID_WELL_KNOWN_BASE) 695 continue; 696 /* skip the adapter's port and known remote ports */ 697 if (be64_to_cpu(acc->fp_wwpn) == 698 fc_host_port_name(adapter->scsi_host)) 699 continue; 700 701 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), 702 ZFCP_STATUS_COMMON_NOESC, d_id); 703 if (!IS_ERR(port)) 704 zfcp_erp_port_reopen(port, 0, "fcegpf1"); 705 else if (PTR_ERR(port) != -EEXIST) 706 ret = PTR_ERR(port); 707 } 708 709 zfcp_erp_wait(adapter); 710 write_lock_irqsave(&adapter->port_list_lock, flags); 711 list_for_each_entry_safe(port, tmp, &adapter->port_list, list) 712 zfcp_fc_validate_port(port, &remove_lh); 713 write_unlock_irqrestore(&adapter->port_list_lock, flags); 714 715 list_for_each_entry_safe(port, tmp, &remove_lh, list) { 716 zfcp_erp_port_shutdown(port, 0, "fcegpf2"); 717 device_unregister(&port->dev); 718 } 719 720 return ret; 721 } 722 723 /** 724 * zfcp_fc_scan_ports - scan remote ports and attach new ports 725 * @work: reference to scheduled work 726 */ 727 void zfcp_fc_scan_ports(struct work_struct *work) 728 { 729 struct delayed_work *dw = to_delayed_work(work); 730 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, 731 scan_work); 732 int ret, i; 733 struct zfcp_fc_req *fc_req; 734 int chain, max_entries, buf_num, max_bytes; 735 736 zfcp_fc_port_scan_time(adapter); 737 738 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; 739 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; 740 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; 741 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; 742 743 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 744 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 745 return; 746 747 if (zfcp_fc_wka_port_get(&adapter->gs->ds)) 748 return; 749 750 fc_req = zfcp_alloc_sg_env(buf_num); 751 if (!fc_req) 752 goto out; 753 754 for (i = 0; i < 3; i++) { 755 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); 756 if (!ret) { 757 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); 758 if (ret == -EAGAIN) 759 ssleep(1); 760 else 761 break; 762 } 763 } 764 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); 765 kmem_cache_free(zfcp_fc_req_cache, fc_req); 766 out: 767 zfcp_fc_wka_port_put(&adapter->gs->ds); 768 } 769 770 static int zfcp_fc_gspn(struct zfcp_adapter *adapter, 771 struct zfcp_fc_req *fc_req) 772 { 773 DECLARE_COMPLETION_ONSTACK(completion); 774 char devno[] = "DEVNO:"; 775 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 776 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; 777 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; 778 int ret; 779 780 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, 781 FC_SYMBOLIC_NAME_SIZE); 782 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); 783 784 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); 785 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); 786 787 ct_els->handler = zfcp_fc_complete; 788 ct_els->handler_data = &completion; 789 ct_els->req = &fc_req->sg_req; 790 ct_els->resp = &fc_req->sg_rsp; 791 792 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 793 ZFCP_FC_CTELS_TMO); 794 if (ret) 795 return ret; 796 797 wait_for_completion(&completion); 798 if (ct_els->status) 799 return ct_els->status; 800 801 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && 802 !(strstr(gspn_rsp->gspn.fp_name, devno))) 803 snprintf(fc_host_symbolic_name(adapter->scsi_host), 804 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", 805 gspn_rsp->gspn.fp_name, devno, 806 dev_name(&adapter->ccw_device->dev), 807 init_utsname()->nodename); 808 else 809 strlcpy(fc_host_symbolic_name(adapter->scsi_host), 810 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); 811 812 return 0; 813 } 814 815 static void zfcp_fc_rspn(struct zfcp_adapter *adapter, 816 struct zfcp_fc_req *fc_req) 817 { 818 DECLARE_COMPLETION_ONSTACK(completion); 819 struct Scsi_Host *shost = adapter->scsi_host; 820 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; 821 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; 822 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; 823 int ret, len; 824 825 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, 826 FC_SYMBOLIC_NAME_SIZE); 827 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); 828 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), 829 FC_SYMBOLIC_NAME_SIZE); 830 rspn_req->rspn.fr_name_len = len; 831 832 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); 833 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); 834 835 ct_els->handler = zfcp_fc_complete; 836 ct_els->handler_data = &completion; 837 ct_els->req = &fc_req->sg_req; 838 ct_els->resp = &fc_req->sg_rsp; 839 840 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, 841 ZFCP_FC_CTELS_TMO); 842 if (!ret) 843 wait_for_completion(&completion); 844 } 845 846 /** 847 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name 848 * @work: ns_up_work of the adapter where to update the symbolic port name 849 * 850 * Retrieve the current symbolic port name that may have been set by 851 * the hardware using the GSPN request and update the fc_host 852 * symbolic_name sysfs attribute. When running in NPIV mode (and hence 853 * the port name is unique for this system), update the symbolic port 854 * name to add Linux specific information and update the FC nameserver 855 * using the RSPN request. 856 */ 857 void zfcp_fc_sym_name_update(struct work_struct *work) 858 { 859 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, 860 ns_up_work); 861 int ret; 862 struct zfcp_fc_req *fc_req; 863 864 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && 865 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 866 return; 867 868 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); 869 if (!fc_req) 870 return; 871 872 ret = zfcp_fc_wka_port_get(&adapter->gs->ds); 873 if (ret) 874 goto out_free; 875 876 ret = zfcp_fc_gspn(adapter, fc_req); 877 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) 878 goto out_ds_put; 879 880 memset(fc_req, 0, sizeof(*fc_req)); 881 zfcp_fc_rspn(adapter, fc_req); 882 883 out_ds_put: 884 zfcp_fc_wka_port_put(&adapter->gs->ds); 885 out_free: 886 kmem_cache_free(zfcp_fc_req_cache, fc_req); 887 } 888 889 static void zfcp_fc_ct_els_job_handler(void *data) 890 { 891 struct bsg_job *job = data; 892 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; 893 struct fc_bsg_reply *jr = job->reply; 894 895 jr->reply_payload_rcv_len = job->reply_payload.payload_len; 896 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; 897 jr->result = zfcp_ct_els->status ? -EIO : 0; 898 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); 899 } 900 901 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) 902 { 903 u32 preamble_word1; 904 u8 gs_type; 905 struct zfcp_adapter *adapter; 906 struct fc_bsg_request *bsg_request = job->request; 907 struct fc_rport *rport = fc_bsg_to_rport(job); 908 struct Scsi_Host *shost; 909 910 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; 911 gs_type = (preamble_word1 & 0xff000000) >> 24; 912 913 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 914 adapter = (struct zfcp_adapter *) shost->hostdata[0]; 915 916 switch (gs_type) { 917 case FC_FST_ALIAS: 918 return &adapter->gs->as; 919 case FC_FST_MGMT: 920 return &adapter->gs->ms; 921 case FC_FST_TIME: 922 return &adapter->gs->ts; 923 break; 924 case FC_FST_DIR: 925 return &adapter->gs->ds; 926 break; 927 default: 928 return NULL; 929 } 930 } 931 932 static void zfcp_fc_ct_job_handler(void *data) 933 { 934 struct bsg_job *job = data; 935 struct zfcp_fc_wka_port *wka_port; 936 937 wka_port = zfcp_fc_job_wka_port(job); 938 zfcp_fc_wka_port_put(wka_port); 939 940 zfcp_fc_ct_els_job_handler(data); 941 } 942 943 static int zfcp_fc_exec_els_job(struct bsg_job *job, 944 struct zfcp_adapter *adapter) 945 { 946 struct zfcp_fsf_ct_els *els = job->dd_data; 947 struct fc_rport *rport = fc_bsg_to_rport(job); 948 struct fc_bsg_request *bsg_request = job->request; 949 struct zfcp_port *port; 950 u32 d_id; 951 952 if (rport) { 953 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 954 if (!port) 955 return -EINVAL; 956 957 d_id = port->d_id; 958 put_device(&port->dev); 959 } else 960 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); 961 962 els->handler = zfcp_fc_ct_els_job_handler; 963 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ); 964 } 965 966 static int zfcp_fc_exec_ct_job(struct bsg_job *job, 967 struct zfcp_adapter *adapter) 968 { 969 int ret; 970 struct zfcp_fsf_ct_els *ct = job->dd_data; 971 struct zfcp_fc_wka_port *wka_port; 972 973 wka_port = zfcp_fc_job_wka_port(job); 974 if (!wka_port) 975 return -EINVAL; 976 977 ret = zfcp_fc_wka_port_get(wka_port); 978 if (ret) 979 return ret; 980 981 ct->handler = zfcp_fc_ct_job_handler; 982 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ); 983 if (ret) 984 zfcp_fc_wka_port_put(wka_port); 985 986 return ret; 987 } 988 989 int zfcp_fc_exec_bsg_job(struct bsg_job *job) 990 { 991 struct Scsi_Host *shost; 992 struct zfcp_adapter *adapter; 993 struct zfcp_fsf_ct_els *ct_els = job->dd_data; 994 struct fc_bsg_request *bsg_request = job->request; 995 struct fc_rport *rport = fc_bsg_to_rport(job); 996 997 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); 998 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 999 1000 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) 1001 return -EINVAL; 1002 1003 ct_els->req = job->request_payload.sg_list; 1004 ct_els->resp = job->reply_payload.sg_list; 1005 ct_els->handler_data = job; 1006 1007 switch (bsg_request->msgcode) { 1008 case FC_BSG_RPT_ELS: 1009 case FC_BSG_HST_ELS_NOLOGIN: 1010 return zfcp_fc_exec_els_job(job, adapter); 1011 case FC_BSG_RPT_CT: 1012 case FC_BSG_HST_CT: 1013 return zfcp_fc_exec_ct_job(job, adapter); 1014 default: 1015 return -EINVAL; 1016 } 1017 } 1018 1019 int zfcp_fc_timeout_bsg_job(struct bsg_job *job) 1020 { 1021 /* hardware tracks timeout, reset bsg timeout to not interfere */ 1022 return -EAGAIN; 1023 } 1024 1025 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) 1026 { 1027 struct zfcp_fc_wka_ports *wka_ports; 1028 1029 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); 1030 if (!wka_ports) 1031 return -ENOMEM; 1032 1033 adapter->gs = wka_ports; 1034 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); 1035 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); 1036 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); 1037 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); 1038 1039 return 0; 1040 } 1041 1042 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) 1043 { 1044 kfree(adapter->gs); 1045 adapter->gs = NULL; 1046 } 1047 1048