1 /* 2 * Copyright(c) 2007 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20 /* 21 * PORT LOCKING NOTES 22 * 23 * These comments only apply to the 'port code' which consists of the lport, 24 * disc and rport blocks. 25 * 26 * MOTIVATION 27 * 28 * The lport, disc and rport blocks all have mutexes that are used to protect 29 * those objects. The main motivation for these locks is to prevent from 30 * having an lport reset just before we send a frame. In that scenario the 31 * lport's FID would get set to zero and then we'd send a frame with an 32 * invalid SID. We also need to ensure that states don't change unexpectedly 33 * while processing another state. 34 * 35 * HIERARCHY 36 * 37 * The following hierarchy defines the locking rules. A greater lock 38 * may be held before acquiring a lesser lock, but a lesser lock should never 39 * be held while attempting to acquire a greater lock. Here is the hierarchy- 40 * 41 * lport > disc, lport > rport, disc > rport 42 * 43 * CALLBACKS 44 * 45 * The callbacks cause complications with this scheme. There is a callback 46 * from the rport (to either lport or disc) and a callback from disc 47 * (to the lport). 48 * 49 * As rports exit the rport state machine a callback is made to the owner of 50 * the rport to notify success or failure. Since the callback is likely to 51 * cause the lport or disc to grab its lock we cannot hold the rport lock 52 * while making the callback. To ensure that the rport is not free'd while 53 * processing the callback the rport callbacks are serialized through a 54 * single-threaded workqueue. An rport would never be free'd while in a 55 * callback handler becuase no other rport work in this queue can be executed 56 * at the same time. 57 * 58 * When discovery succeeds or fails a callback is made to the lport as 59 * notification. Currently, successful discovery causes the lport to take no 60 * action. A failure will cause the lport to reset. There is likely a circular 61 * locking problem with this implementation. 62 */ 63 64 /* 65 * LPORT LOCKING 66 * 67 * The critical sections protected by the lport's mutex are quite broad and 68 * may be improved upon in the future. The lport code and its locking doesn't 69 * influence the I/O path, so excessive locking doesn't penalize I/O 70 * performance. 71 * 72 * The strategy is to lock whenever processing a request or response. Note 73 * that every _enter_* function corresponds to a state change. They generally 74 * change the lports state and then send a request out on the wire. We lock 75 * before calling any of these functions to protect that state change. This 76 * means that the entry points into the lport block manage the locks while 77 * the state machine can transition between states (i.e. _enter_* functions) 78 * while always staying protected. 79 * 80 * When handling responses we also hold the lport mutex broadly. When the 81 * lport receives the response frame it locks the mutex and then calls the 82 * appropriate handler for the particuar response. Generally a response will 83 * trigger a state change and so the lock must already be held. 84 * 85 * Retries also have to consider the locking. The retries occur from a work 86 * context and the work function will lock the lport and then retry the state 87 * (i.e. _enter_* function). 88 */ 89 90 #include <linux/timer.h> 91 #include <linux/slab.h> 92 #include <asm/unaligned.h> 93 94 #include <scsi/fc/fc_gs.h> 95 96 #include <scsi/libfc.h> 97 #include <scsi/fc_encode.h> 98 #include <linux/scatterlist.h> 99 100 #include "fc_libfc.h" 101 102 /* Fabric IDs to use for point-to-point mode, chosen on whims. */ 103 #define FC_LOCAL_PTP_FID_LO 0x010101 104 #define FC_LOCAL_PTP_FID_HI 0x010102 105 106 #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ 107 108 static void fc_lport_error(struct fc_lport *, struct fc_frame *); 109 110 static void fc_lport_enter_reset(struct fc_lport *); 111 static void fc_lport_enter_flogi(struct fc_lport *); 112 static void fc_lport_enter_dns(struct fc_lport *); 113 static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state); 114 static void fc_lport_enter_scr(struct fc_lport *); 115 static void fc_lport_enter_ready(struct fc_lport *); 116 static void fc_lport_enter_logo(struct fc_lport *); 117 118 static const char *fc_lport_state_names[] = { 119 [LPORT_ST_DISABLED] = "disabled", 120 [LPORT_ST_FLOGI] = "FLOGI", 121 [LPORT_ST_DNS] = "dNS", 122 [LPORT_ST_RNN_ID] = "RNN_ID", 123 [LPORT_ST_RSNN_NN] = "RSNN_NN", 124 [LPORT_ST_RSPN_ID] = "RSPN_ID", 125 [LPORT_ST_RFT_ID] = "RFT_ID", 126 [LPORT_ST_RFF_ID] = "RFF_ID", 127 [LPORT_ST_SCR] = "SCR", 128 [LPORT_ST_READY] = "Ready", 129 [LPORT_ST_LOGO] = "LOGO", 130 [LPORT_ST_RESET] = "reset", 131 }; 132 133 /** 134 * struct fc_bsg_info - FC Passthrough managemet structure 135 * @job: The passthrough job 136 * @lport: The local port to pass through a command 137 * @rsp_code: The expected response code 138 * @sg: job->reply_payload.sg_list 139 * @nents: job->reply_payload.sg_cnt 140 * @offset: The offset into the response data 141 */ 142 struct fc_bsg_info { 143 struct fc_bsg_job *job; 144 struct fc_lport *lport; 145 u16 rsp_code; 146 struct scatterlist *sg; 147 u32 nents; 148 size_t offset; 149 }; 150 151 /** 152 * fc_frame_drop() - Dummy frame handler 153 * @lport: The local port the frame was received on 154 * @fp: The received frame 155 */ 156 static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) 157 { 158 fc_frame_free(fp); 159 return 0; 160 } 161 162 /** 163 * fc_lport_rport_callback() - Event handler for rport events 164 * @lport: The lport which is receiving the event 165 * @rdata: private remote port data 166 * @event: The event that occured 167 * 168 * Locking Note: The rport lock should not be held when calling 169 * this function. 170 */ 171 static void fc_lport_rport_callback(struct fc_lport *lport, 172 struct fc_rport_priv *rdata, 173 enum fc_rport_event event) 174 { 175 FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event, 176 rdata->ids.port_id); 177 178 mutex_lock(&lport->lp_mutex); 179 switch (event) { 180 case RPORT_EV_READY: 181 if (lport->state == LPORT_ST_DNS) { 182 lport->dns_rdata = rdata; 183 fc_lport_enter_ns(lport, LPORT_ST_RNN_ID); 184 } else { 185 FC_LPORT_DBG(lport, "Received an READY event " 186 "on port (%6.6x) for the directory " 187 "server, but the lport is not " 188 "in the DNS state, it's in the " 189 "%d state", rdata->ids.port_id, 190 lport->state); 191 lport->tt.rport_logoff(rdata); 192 } 193 break; 194 case RPORT_EV_LOGO: 195 case RPORT_EV_FAILED: 196 case RPORT_EV_STOP: 197 lport->dns_rdata = NULL; 198 break; 199 case RPORT_EV_NONE: 200 break; 201 } 202 mutex_unlock(&lport->lp_mutex); 203 } 204 205 /** 206 * fc_lport_state() - Return a string which represents the lport's state 207 * @lport: The lport whose state is to converted to a string 208 */ 209 static const char *fc_lport_state(struct fc_lport *lport) 210 { 211 const char *cp; 212 213 cp = fc_lport_state_names[lport->state]; 214 if (!cp) 215 cp = "unknown"; 216 return cp; 217 } 218 219 /** 220 * fc_lport_ptp_setup() - Create an rport for point-to-point mode 221 * @lport: The lport to attach the ptp rport to 222 * @remote_fid: The FID of the ptp rport 223 * @remote_wwpn: The WWPN of the ptp rport 224 * @remote_wwnn: The WWNN of the ptp rport 225 */ 226 static void fc_lport_ptp_setup(struct fc_lport *lport, 227 u32 remote_fid, u64 remote_wwpn, 228 u64 remote_wwnn) 229 { 230 mutex_lock(&lport->disc.disc_mutex); 231 if (lport->ptp_rdata) { 232 lport->tt.rport_logoff(lport->ptp_rdata); 233 kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy); 234 } 235 lport->ptp_rdata = lport->tt.rport_create(lport, remote_fid); 236 kref_get(&lport->ptp_rdata->kref); 237 lport->ptp_rdata->ids.port_name = remote_wwpn; 238 lport->ptp_rdata->ids.node_name = remote_wwnn; 239 mutex_unlock(&lport->disc.disc_mutex); 240 241 lport->tt.rport_login(lport->ptp_rdata); 242 243 fc_lport_enter_ready(lport); 244 } 245 246 /** 247 * fc_get_host_port_state() - Return the port state of the given Scsi_Host 248 * @shost: The SCSI host whose port state is to be determined 249 */ 250 void fc_get_host_port_state(struct Scsi_Host *shost) 251 { 252 struct fc_lport *lport = shost_priv(shost); 253 254 mutex_lock(&lport->lp_mutex); 255 if (!lport->link_up) 256 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 257 else 258 switch (lport->state) { 259 case LPORT_ST_READY: 260 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 261 break; 262 default: 263 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 264 } 265 mutex_unlock(&lport->lp_mutex); 266 } 267 EXPORT_SYMBOL(fc_get_host_port_state); 268 269 /** 270 * fc_get_host_speed() - Return the speed of the given Scsi_Host 271 * @shost: The SCSI host whose port speed is to be determined 272 */ 273 void fc_get_host_speed(struct Scsi_Host *shost) 274 { 275 struct fc_lport *lport = shost_priv(shost); 276 277 fc_host_speed(shost) = lport->link_speed; 278 } 279 EXPORT_SYMBOL(fc_get_host_speed); 280 281 /** 282 * fc_get_host_stats() - Return the Scsi_Host's statistics 283 * @shost: The SCSI host whose statistics are to be returned 284 */ 285 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) 286 { 287 struct fc_host_statistics *fcoe_stats; 288 struct fc_lport *lport = shost_priv(shost); 289 struct timespec v0, v1; 290 unsigned int cpu; 291 292 fcoe_stats = &lport->host_stats; 293 memset(fcoe_stats, 0, sizeof(struct fc_host_statistics)); 294 295 jiffies_to_timespec(jiffies, &v0); 296 jiffies_to_timespec(lport->boot_time, &v1); 297 fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); 298 299 for_each_possible_cpu(cpu) { 300 struct fcoe_dev_stats *stats; 301 302 stats = per_cpu_ptr(lport->dev_stats, cpu); 303 304 fcoe_stats->tx_frames += stats->TxFrames; 305 fcoe_stats->tx_words += stats->TxWords; 306 fcoe_stats->rx_frames += stats->RxFrames; 307 fcoe_stats->rx_words += stats->RxWords; 308 fcoe_stats->error_frames += stats->ErrorFrames; 309 fcoe_stats->invalid_crc_count += stats->InvalidCRCCount; 310 fcoe_stats->fcp_input_requests += stats->InputRequests; 311 fcoe_stats->fcp_output_requests += stats->OutputRequests; 312 fcoe_stats->fcp_control_requests += stats->ControlRequests; 313 fcoe_stats->fcp_input_megabytes += stats->InputMegabytes; 314 fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes; 315 fcoe_stats->link_failure_count += stats->LinkFailureCount; 316 } 317 fcoe_stats->lip_count = -1; 318 fcoe_stats->nos_count = -1; 319 fcoe_stats->loss_of_sync_count = -1; 320 fcoe_stats->loss_of_signal_count = -1; 321 fcoe_stats->prim_seq_protocol_err_count = -1; 322 fcoe_stats->dumped_frames = -1; 323 return fcoe_stats; 324 } 325 EXPORT_SYMBOL(fc_get_host_stats); 326 327 /** 328 * fc_lport_flogi_fill() - Fill in FLOGI command for request 329 * @lport: The local port the FLOGI is for 330 * @flogi: The FLOGI command 331 * @op: The opcode 332 */ 333 static void fc_lport_flogi_fill(struct fc_lport *lport, 334 struct fc_els_flogi *flogi, 335 unsigned int op) 336 { 337 struct fc_els_csp *sp; 338 struct fc_els_cssp *cp; 339 340 memset(flogi, 0, sizeof(*flogi)); 341 flogi->fl_cmd = (u8) op; 342 put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); 343 put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); 344 sp = &flogi->fl_csp; 345 sp->sp_hi_ver = 0x20; 346 sp->sp_lo_ver = 0x20; 347 sp->sp_bb_cred = htons(10); /* this gets set by gateway */ 348 sp->sp_bb_data = htons((u16) lport->mfs); 349 cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ 350 cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); 351 if (op != ELS_FLOGI) { 352 sp->sp_features = htons(FC_SP_FT_CIRO); 353 sp->sp_tot_seq = htons(255); /* seq. we accept */ 354 sp->sp_rel_off = htons(0x1f); 355 sp->sp_e_d_tov = htonl(lport->e_d_tov); 356 357 cp->cp_rdfs = htons((u16) lport->mfs); 358 cp->cp_con_seq = htons(255); 359 cp->cp_open_seq = 1; 360 } 361 } 362 363 /** 364 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port 365 * @lport: The local port to add a new FC-4 type to 366 * @type: The new FC-4 type 367 */ 368 static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) 369 { 370 __be32 *mp; 371 372 mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; 373 *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); 374 } 375 376 /** 377 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report. 378 * @lport: Fibre Channel local port recieving the RLIR 379 * @fp: The RLIR request frame 380 * 381 * Locking Note: The lport lock is expected to be held before calling 382 * this function. 383 */ 384 static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp) 385 { 386 FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n", 387 fc_lport_state(lport)); 388 389 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 390 fc_frame_free(fp); 391 } 392 393 /** 394 * fc_lport_recv_echo_req() - Handle received ECHO request 395 * @lport: The local port recieving the ECHO 396 * @fp: ECHO request frame 397 * 398 * Locking Note: The lport lock is expected to be held before calling 399 * this function. 400 */ 401 static void fc_lport_recv_echo_req(struct fc_lport *lport, 402 struct fc_frame *in_fp) 403 { 404 struct fc_frame *fp; 405 unsigned int len; 406 void *pp; 407 void *dp; 408 409 FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n", 410 fc_lport_state(lport)); 411 412 len = fr_len(in_fp) - sizeof(struct fc_frame_header); 413 pp = fc_frame_payload_get(in_fp, len); 414 415 if (len < sizeof(__be32)) 416 len = sizeof(__be32); 417 418 fp = fc_frame_alloc(lport, len); 419 if (fp) { 420 dp = fc_frame_payload_get(fp, len); 421 memcpy(dp, pp, len); 422 *((__be32 *)dp) = htonl(ELS_LS_ACC << 24); 423 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); 424 lport->tt.frame_send(lport, fp); 425 } 426 fc_frame_free(in_fp); 427 } 428 429 /** 430 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request 431 * @lport: The local port recieving the RNID 432 * @fp: The RNID request frame 433 * 434 * Locking Note: The lport lock is expected to be held before calling 435 * this function. 436 */ 437 static void fc_lport_recv_rnid_req(struct fc_lport *lport, 438 struct fc_frame *in_fp) 439 { 440 struct fc_frame *fp; 441 struct fc_els_rnid *req; 442 struct { 443 struct fc_els_rnid_resp rnid; 444 struct fc_els_rnid_cid cid; 445 struct fc_els_rnid_gen gen; 446 } *rp; 447 struct fc_seq_els_data rjt_data; 448 u8 fmt; 449 size_t len; 450 451 FC_LPORT_DBG(lport, "Received RNID request while in state %s\n", 452 fc_lport_state(lport)); 453 454 req = fc_frame_payload_get(in_fp, sizeof(*req)); 455 if (!req) { 456 rjt_data.reason = ELS_RJT_LOGIC; 457 rjt_data.explan = ELS_EXPL_NONE; 458 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); 459 } else { 460 fmt = req->rnid_fmt; 461 len = sizeof(*rp); 462 if (fmt != ELS_RNIDF_GEN || 463 ntohl(lport->rnid_gen.rnid_atype) == 0) { 464 fmt = ELS_RNIDF_NONE; /* nothing to provide */ 465 len -= sizeof(rp->gen); 466 } 467 fp = fc_frame_alloc(lport, len); 468 if (fp) { 469 rp = fc_frame_payload_get(fp, len); 470 memset(rp, 0, len); 471 rp->rnid.rnid_cmd = ELS_LS_ACC; 472 rp->rnid.rnid_fmt = fmt; 473 rp->rnid.rnid_cid_len = sizeof(rp->cid); 474 rp->cid.rnid_wwpn = htonll(lport->wwpn); 475 rp->cid.rnid_wwnn = htonll(lport->wwnn); 476 if (fmt == ELS_RNIDF_GEN) { 477 rp->rnid.rnid_sid_len = sizeof(rp->gen); 478 memcpy(&rp->gen, &lport->rnid_gen, 479 sizeof(rp->gen)); 480 } 481 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); 482 lport->tt.frame_send(lport, fp); 483 } 484 } 485 fc_frame_free(in_fp); 486 } 487 488 /** 489 * fc_lport_recv_logo_req() - Handle received fabric LOGO request 490 * @lport: The local port recieving the LOGO 491 * @fp: The LOGO request frame 492 * 493 * Locking Note: The lport lock is exected to be held before calling 494 * this function. 495 */ 496 static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) 497 { 498 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 499 fc_lport_enter_reset(lport); 500 fc_frame_free(fp); 501 } 502 503 /** 504 * fc_fabric_login() - Start the lport state machine 505 * @lport: The local port that should log into the fabric 506 * 507 * Locking Note: This function should not be called 508 * with the lport lock held. 509 */ 510 int fc_fabric_login(struct fc_lport *lport) 511 { 512 int rc = -1; 513 514 mutex_lock(&lport->lp_mutex); 515 if (lport->state == LPORT_ST_DISABLED || 516 lport->state == LPORT_ST_LOGO) { 517 fc_lport_state_enter(lport, LPORT_ST_RESET); 518 fc_lport_enter_reset(lport); 519 rc = 0; 520 } 521 mutex_unlock(&lport->lp_mutex); 522 523 return rc; 524 } 525 EXPORT_SYMBOL(fc_fabric_login); 526 527 /** 528 * __fc_linkup() - Handler for transport linkup events 529 * @lport: The lport whose link is up 530 * 531 * Locking: must be called with the lp_mutex held 532 */ 533 void __fc_linkup(struct fc_lport *lport) 534 { 535 if (!lport->link_up) { 536 lport->link_up = 1; 537 538 if (lport->state == LPORT_ST_RESET) 539 fc_lport_enter_flogi(lport); 540 } 541 } 542 543 /** 544 * fc_linkup() - Handler for transport linkup events 545 * @lport: The local port whose link is up 546 */ 547 void fc_linkup(struct fc_lport *lport) 548 { 549 printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n", 550 lport->host->host_no, lport->port_id); 551 552 mutex_lock(&lport->lp_mutex); 553 __fc_linkup(lport); 554 mutex_unlock(&lport->lp_mutex); 555 } 556 EXPORT_SYMBOL(fc_linkup); 557 558 /** 559 * __fc_linkdown() - Handler for transport linkdown events 560 * @lport: The lport whose link is down 561 * 562 * Locking: must be called with the lp_mutex held 563 */ 564 void __fc_linkdown(struct fc_lport *lport) 565 { 566 if (lport->link_up) { 567 lport->link_up = 0; 568 fc_lport_enter_reset(lport); 569 lport->tt.fcp_cleanup(lport); 570 } 571 } 572 573 /** 574 * fc_linkdown() - Handler for transport linkdown events 575 * @lport: The local port whose link is down 576 */ 577 void fc_linkdown(struct fc_lport *lport) 578 { 579 printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n", 580 lport->host->host_no, lport->port_id); 581 582 mutex_lock(&lport->lp_mutex); 583 __fc_linkdown(lport); 584 mutex_unlock(&lport->lp_mutex); 585 } 586 EXPORT_SYMBOL(fc_linkdown); 587 588 /** 589 * fc_fabric_logoff() - Logout of the fabric 590 * @lport: The local port to logoff the fabric 591 * 592 * Return value: 593 * 0 for success, -1 for failure 594 */ 595 int fc_fabric_logoff(struct fc_lport *lport) 596 { 597 lport->tt.disc_stop_final(lport); 598 mutex_lock(&lport->lp_mutex); 599 if (lport->dns_rdata) 600 lport->tt.rport_logoff(lport->dns_rdata); 601 mutex_unlock(&lport->lp_mutex); 602 lport->tt.rport_flush_queue(); 603 mutex_lock(&lport->lp_mutex); 604 fc_lport_enter_logo(lport); 605 mutex_unlock(&lport->lp_mutex); 606 cancel_delayed_work_sync(&lport->retry_work); 607 return 0; 608 } 609 EXPORT_SYMBOL(fc_fabric_logoff); 610 611 /** 612 * fc_lport_destroy() - Unregister a fc_lport 613 * @lport: The local port to unregister 614 * 615 * Note: 616 * exit routine for fc_lport instance 617 * clean-up all the allocated memory 618 * and free up other system resources. 619 * 620 */ 621 int fc_lport_destroy(struct fc_lport *lport) 622 { 623 mutex_lock(&lport->lp_mutex); 624 lport->state = LPORT_ST_DISABLED; 625 lport->link_up = 0; 626 lport->tt.frame_send = fc_frame_drop; 627 mutex_unlock(&lport->lp_mutex); 628 629 lport->tt.fcp_abort_io(lport); 630 lport->tt.disc_stop_final(lport); 631 lport->tt.exch_mgr_reset(lport, 0, 0); 632 return 0; 633 } 634 EXPORT_SYMBOL(fc_lport_destroy); 635 636 /** 637 * fc_set_mfs() - Set the maximum frame size for a local port 638 * @lport: The local port to set the MFS for 639 * @mfs: The new MFS 640 */ 641 int fc_set_mfs(struct fc_lport *lport, u32 mfs) 642 { 643 unsigned int old_mfs; 644 int rc = -EINVAL; 645 646 mutex_lock(&lport->lp_mutex); 647 648 old_mfs = lport->mfs; 649 650 if (mfs >= FC_MIN_MAX_FRAME) { 651 mfs &= ~3; 652 if (mfs > FC_MAX_FRAME) 653 mfs = FC_MAX_FRAME; 654 mfs -= sizeof(struct fc_frame_header); 655 lport->mfs = mfs; 656 rc = 0; 657 } 658 659 if (!rc && mfs < old_mfs) 660 fc_lport_enter_reset(lport); 661 662 mutex_unlock(&lport->lp_mutex); 663 664 return rc; 665 } 666 EXPORT_SYMBOL(fc_set_mfs); 667 668 /** 669 * fc_lport_disc_callback() - Callback for discovery events 670 * @lport: The local port receiving the event 671 * @event: The discovery event 672 */ 673 void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) 674 { 675 switch (event) { 676 case DISC_EV_SUCCESS: 677 FC_LPORT_DBG(lport, "Discovery succeeded\n"); 678 break; 679 case DISC_EV_FAILED: 680 printk(KERN_ERR "host%d: libfc: " 681 "Discovery failed for port (%6.6x)\n", 682 lport->host->host_no, lport->port_id); 683 mutex_lock(&lport->lp_mutex); 684 fc_lport_enter_reset(lport); 685 mutex_unlock(&lport->lp_mutex); 686 break; 687 case DISC_EV_NONE: 688 WARN_ON(1); 689 break; 690 } 691 } 692 693 /** 694 * fc_rport_enter_ready() - Enter the ready state and start discovery 695 * @lport: The local port that is ready 696 * 697 * Locking Note: The lport lock is expected to be held before calling 698 * this routine. 699 */ 700 static void fc_lport_enter_ready(struct fc_lport *lport) 701 { 702 FC_LPORT_DBG(lport, "Entered READY from state %s\n", 703 fc_lport_state(lport)); 704 705 fc_lport_state_enter(lport, LPORT_ST_READY); 706 if (lport->vport) 707 fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE); 708 fc_vports_linkchange(lport); 709 710 if (!lport->ptp_rdata) 711 lport->tt.disc_start(fc_lport_disc_callback, lport); 712 } 713 714 /** 715 * fc_lport_set_port_id() - set the local port Port ID 716 * @lport: The local port which will have its Port ID set. 717 * @port_id: The new port ID. 718 * @fp: The frame containing the incoming request, or NULL. 719 * 720 * Locking Note: The lport lock is expected to be held before calling 721 * this function. 722 */ 723 static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id, 724 struct fc_frame *fp) 725 { 726 if (port_id) 727 printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n", 728 lport->host->host_no, port_id); 729 730 lport->port_id = port_id; 731 732 /* Update the fc_host */ 733 fc_host_port_id(lport->host) = port_id; 734 735 if (lport->tt.lport_set_port_id) 736 lport->tt.lport_set_port_id(lport, port_id, fp); 737 } 738 739 /** 740 * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint 741 * @lport: The local port which will have its Port ID set. 742 * @port_id: The new port ID. 743 * 744 * Called by the lower-level driver when transport sets the local port_id. 745 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and 746 * discovery to be skipped. 747 */ 748 void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id) 749 { 750 mutex_lock(&lport->lp_mutex); 751 752 fc_lport_set_port_id(lport, port_id, NULL); 753 754 switch (lport->state) { 755 case LPORT_ST_RESET: 756 case LPORT_ST_FLOGI: 757 if (port_id) 758 fc_lport_enter_ready(lport); 759 break; 760 default: 761 break; 762 } 763 mutex_unlock(&lport->lp_mutex); 764 } 765 EXPORT_SYMBOL(fc_lport_set_local_id); 766 767 /** 768 * fc_lport_recv_flogi_req() - Receive a FLOGI request 769 * @lport: The local port that recieved the request 770 * @rx_fp: The FLOGI frame 771 * 772 * A received FLOGI request indicates a point-to-point connection. 773 * Accept it with the common service parameters indicating our N port. 774 * Set up to do a PLOGI if we have the higher-number WWPN. 775 * 776 * Locking Note: The lport lock is expected to be held before calling 777 * this function. 778 */ 779 static void fc_lport_recv_flogi_req(struct fc_lport *lport, 780 struct fc_frame *rx_fp) 781 { 782 struct fc_frame *fp; 783 struct fc_frame_header *fh; 784 struct fc_els_flogi *flp; 785 struct fc_els_flogi *new_flp; 786 u64 remote_wwpn; 787 u32 remote_fid; 788 u32 local_fid; 789 790 FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n", 791 fc_lport_state(lport)); 792 793 remote_fid = fc_frame_sid(rx_fp); 794 flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); 795 if (!flp) 796 goto out; 797 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); 798 if (remote_wwpn == lport->wwpn) { 799 printk(KERN_WARNING "host%d: libfc: Received FLOGI from port " 800 "with same WWPN %16.16llx\n", 801 lport->host->host_no, remote_wwpn); 802 goto out; 803 } 804 FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn); 805 806 /* 807 * XXX what is the right thing to do for FIDs? 808 * The originator might expect our S_ID to be 0xfffffe. 809 * But if so, both of us could end up with the same FID. 810 */ 811 local_fid = FC_LOCAL_PTP_FID_LO; 812 if (remote_wwpn < lport->wwpn) { 813 local_fid = FC_LOCAL_PTP_FID_HI; 814 if (!remote_fid || remote_fid == local_fid) 815 remote_fid = FC_LOCAL_PTP_FID_LO; 816 } else if (!remote_fid) { 817 remote_fid = FC_LOCAL_PTP_FID_HI; 818 } 819 820 fc_lport_set_port_id(lport, local_fid, rx_fp); 821 822 fp = fc_frame_alloc(lport, sizeof(*flp)); 823 if (fp) { 824 new_flp = fc_frame_payload_get(fp, sizeof(*flp)); 825 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); 826 new_flp->fl_cmd = (u8) ELS_LS_ACC; 827 828 /* 829 * Send the response. If this fails, the originator should 830 * repeat the sequence. 831 */ 832 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 833 fh = fc_frame_header_get(fp); 834 hton24(fh->fh_s_id, local_fid); 835 hton24(fh->fh_d_id, remote_fid); 836 lport->tt.frame_send(lport, fp); 837 838 } else { 839 fc_lport_error(lport, fp); 840 } 841 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, 842 get_unaligned_be64(&flp->fl_wwnn)); 843 out: 844 fc_frame_free(rx_fp); 845 } 846 847 /** 848 * fc_lport_recv_req() - The generic lport request handler 849 * @lport: The local port that received the request 850 * @fp: The request frame 851 * 852 * This function will see if the lport handles the request or 853 * if an rport should handle the request. 854 * 855 * Locking Note: This function should not be called with the lport 856 * lock held becuase it will grab the lock. 857 */ 858 static void fc_lport_recv_req(struct fc_lport *lport, struct fc_frame *fp) 859 { 860 struct fc_frame_header *fh = fc_frame_header_get(fp); 861 void (*recv)(struct fc_lport *, struct fc_frame *); 862 863 mutex_lock(&lport->lp_mutex); 864 865 /* 866 * Handle special ELS cases like FLOGI, LOGO, and 867 * RSCN here. These don't require a session. 868 * Even if we had a session, it might not be ready. 869 */ 870 if (!lport->link_up) 871 fc_frame_free(fp); 872 else if (fh->fh_type == FC_TYPE_ELS && 873 fh->fh_r_ctl == FC_RCTL_ELS_REQ) { 874 /* 875 * Check opcode. 876 */ 877 recv = lport->tt.rport_recv_req; 878 switch (fc_frame_payload_op(fp)) { 879 case ELS_FLOGI: 880 if (!lport->point_to_multipoint) 881 recv = fc_lport_recv_flogi_req; 882 break; 883 case ELS_LOGO: 884 if (fc_frame_sid(fp) == FC_FID_FLOGI) 885 recv = fc_lport_recv_logo_req; 886 break; 887 case ELS_RSCN: 888 recv = lport->tt.disc_recv_req; 889 break; 890 case ELS_ECHO: 891 recv = fc_lport_recv_echo_req; 892 break; 893 case ELS_RLIR: 894 recv = fc_lport_recv_rlir_req; 895 break; 896 case ELS_RNID: 897 recv = fc_lport_recv_rnid_req; 898 break; 899 } 900 901 recv(lport, fp); 902 } else { 903 FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)\n", 904 fr_eof(fp)); 905 fc_frame_free(fp); 906 } 907 mutex_unlock(&lport->lp_mutex); 908 } 909 910 /** 911 * fc_lport_reset() - Reset a local port 912 * @lport: The local port which should be reset 913 * 914 * Locking Note: This functions should not be called with the 915 * lport lock held. 916 */ 917 int fc_lport_reset(struct fc_lport *lport) 918 { 919 cancel_delayed_work_sync(&lport->retry_work); 920 mutex_lock(&lport->lp_mutex); 921 fc_lport_enter_reset(lport); 922 mutex_unlock(&lport->lp_mutex); 923 return 0; 924 } 925 EXPORT_SYMBOL(fc_lport_reset); 926 927 /** 928 * fc_lport_reset_locked() - Reset the local port w/ the lport lock held 929 * @lport: The local port to be reset 930 * 931 * Locking Note: The lport lock is expected to be held before calling 932 * this routine. 933 */ 934 static void fc_lport_reset_locked(struct fc_lport *lport) 935 { 936 if (lport->dns_rdata) 937 lport->tt.rport_logoff(lport->dns_rdata); 938 939 if (lport->ptp_rdata) { 940 lport->tt.rport_logoff(lport->ptp_rdata); 941 kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy); 942 lport->ptp_rdata = NULL; 943 } 944 945 lport->tt.disc_stop(lport); 946 947 lport->tt.exch_mgr_reset(lport, 0, 0); 948 fc_host_fabric_name(lport->host) = 0; 949 950 if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up)) 951 fc_lport_set_port_id(lport, 0, NULL); 952 } 953 954 /** 955 * fc_lport_enter_reset() - Reset the local port 956 * @lport: The local port to be reset 957 * 958 * Locking Note: The lport lock is expected to be held before calling 959 * this routine. 960 */ 961 static void fc_lport_enter_reset(struct fc_lport *lport) 962 { 963 FC_LPORT_DBG(lport, "Entered RESET state from %s state\n", 964 fc_lport_state(lport)); 965 966 if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO) 967 return; 968 969 if (lport->vport) { 970 if (lport->link_up) 971 fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING); 972 else 973 fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN); 974 } 975 fc_lport_state_enter(lport, LPORT_ST_RESET); 976 fc_vports_linkchange(lport); 977 fc_lport_reset_locked(lport); 978 if (lport->link_up) 979 fc_lport_enter_flogi(lport); 980 } 981 982 /** 983 * fc_lport_enter_disabled() - Disable the local port 984 * @lport: The local port to be reset 985 * 986 * Locking Note: The lport lock is expected to be held before calling 987 * this routine. 988 */ 989 static void fc_lport_enter_disabled(struct fc_lport *lport) 990 { 991 FC_LPORT_DBG(lport, "Entered disabled state from %s state\n", 992 fc_lport_state(lport)); 993 994 fc_lport_state_enter(lport, LPORT_ST_DISABLED); 995 fc_vports_linkchange(lport); 996 fc_lport_reset_locked(lport); 997 } 998 999 /** 1000 * fc_lport_error() - Handler for any errors 1001 * @lport: The local port that the error was on 1002 * @fp: The error code encoded in a frame pointer 1003 * 1004 * If the error was caused by a resource allocation failure 1005 * then wait for half a second and retry, otherwise retry 1006 * after the e_d_tov time. 1007 */ 1008 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) 1009 { 1010 unsigned long delay = 0; 1011 FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n", 1012 PTR_ERR(fp), fc_lport_state(lport), 1013 lport->retry_count); 1014 1015 if (PTR_ERR(fp) == -FC_EX_CLOSED) 1016 return; 1017 1018 /* 1019 * Memory allocation failure, or the exchange timed out 1020 * or we received LS_RJT. 1021 * Retry after delay 1022 */ 1023 if (lport->retry_count < lport->max_retry_count) { 1024 lport->retry_count++; 1025 if (!fp) 1026 delay = msecs_to_jiffies(500); 1027 else 1028 delay = msecs_to_jiffies(lport->e_d_tov); 1029 1030 schedule_delayed_work(&lport->retry_work, delay); 1031 } else 1032 fc_lport_enter_reset(lport); 1033 } 1034 1035 /** 1036 * fc_lport_ns_resp() - Handle response to a name server 1037 * registration exchange 1038 * @sp: current sequence in exchange 1039 * @fp: response frame 1040 * @lp_arg: Fibre Channel host port instance 1041 * 1042 * Locking Note: This function will be called without the lport lock 1043 * held, but it will lock, call an _enter_* function or fc_lport_error() 1044 * and then unlock the lport. 1045 */ 1046 static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp, 1047 void *lp_arg) 1048 { 1049 struct fc_lport *lport = lp_arg; 1050 struct fc_frame_header *fh; 1051 struct fc_ct_hdr *ct; 1052 1053 FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp)); 1054 1055 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1056 return; 1057 1058 mutex_lock(&lport->lp_mutex); 1059 1060 if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) { 1061 FC_LPORT_DBG(lport, "Received a name server response, " 1062 "but in state %s\n", fc_lport_state(lport)); 1063 if (IS_ERR(fp)) 1064 goto err; 1065 goto out; 1066 } 1067 1068 if (IS_ERR(fp)) { 1069 fc_lport_error(lport, fp); 1070 goto err; 1071 } 1072 1073 fh = fc_frame_header_get(fp); 1074 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1075 1076 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1077 ct->ct_fs_type == FC_FST_DIR && 1078 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1079 ntohs(ct->ct_cmd) == FC_FS_ACC) 1080 switch (lport->state) { 1081 case LPORT_ST_RNN_ID: 1082 fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN); 1083 break; 1084 case LPORT_ST_RSNN_NN: 1085 fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID); 1086 break; 1087 case LPORT_ST_RSPN_ID: 1088 fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); 1089 break; 1090 case LPORT_ST_RFT_ID: 1091 fc_lport_enter_ns(lport, LPORT_ST_RFF_ID); 1092 break; 1093 case LPORT_ST_RFF_ID: 1094 fc_lport_enter_scr(lport); 1095 break; 1096 default: 1097 /* should have already been caught by state checks */ 1098 break; 1099 } 1100 else 1101 fc_lport_error(lport, fp); 1102 out: 1103 fc_frame_free(fp); 1104 err: 1105 mutex_unlock(&lport->lp_mutex); 1106 } 1107 1108 /** 1109 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request 1110 * @sp: current sequence in SCR exchange 1111 * @fp: response frame 1112 * @lp_arg: Fibre Channel lport port instance that sent the registration request 1113 * 1114 * Locking Note: This function will be called without the lport lock 1115 * held, but it will lock, call an _enter_* function or fc_lport_error 1116 * and then unlock the lport. 1117 */ 1118 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, 1119 void *lp_arg) 1120 { 1121 struct fc_lport *lport = lp_arg; 1122 u8 op; 1123 1124 FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp)); 1125 1126 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1127 return; 1128 1129 mutex_lock(&lport->lp_mutex); 1130 1131 if (lport->state != LPORT_ST_SCR) { 1132 FC_LPORT_DBG(lport, "Received a SCR response, but in state " 1133 "%s\n", fc_lport_state(lport)); 1134 if (IS_ERR(fp)) 1135 goto err; 1136 goto out; 1137 } 1138 1139 if (IS_ERR(fp)) { 1140 fc_lport_error(lport, fp); 1141 goto err; 1142 } 1143 1144 op = fc_frame_payload_op(fp); 1145 if (op == ELS_LS_ACC) 1146 fc_lport_enter_ready(lport); 1147 else 1148 fc_lport_error(lport, fp); 1149 1150 out: 1151 fc_frame_free(fp); 1152 err: 1153 mutex_unlock(&lport->lp_mutex); 1154 } 1155 1156 /** 1157 * fc_lport_enter_scr() - Send a SCR (State Change Register) request 1158 * @lport: The local port to register for state changes 1159 * 1160 * Locking Note: The lport lock is expected to be held before calling 1161 * this routine. 1162 */ 1163 static void fc_lport_enter_scr(struct fc_lport *lport) 1164 { 1165 struct fc_frame *fp; 1166 1167 FC_LPORT_DBG(lport, "Entered SCR state from %s state\n", 1168 fc_lport_state(lport)); 1169 1170 fc_lport_state_enter(lport, LPORT_ST_SCR); 1171 1172 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); 1173 if (!fp) { 1174 fc_lport_error(lport, fp); 1175 return; 1176 } 1177 1178 if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR, 1179 fc_lport_scr_resp, lport, 1180 2 * lport->r_a_tov)) 1181 fc_lport_error(lport, NULL); 1182 } 1183 1184 /** 1185 * fc_lport_enter_ns() - register some object with the name server 1186 * @lport: Fibre Channel local port to register 1187 * 1188 * Locking Note: The lport lock is expected to be held before calling 1189 * this routine. 1190 */ 1191 static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state) 1192 { 1193 struct fc_frame *fp; 1194 enum fc_ns_req cmd; 1195 int size = sizeof(struct fc_ct_hdr); 1196 size_t len; 1197 1198 FC_LPORT_DBG(lport, "Entered %s state from %s state\n", 1199 fc_lport_state_names[state], 1200 fc_lport_state(lport)); 1201 1202 fc_lport_state_enter(lport, state); 1203 1204 switch (state) { 1205 case LPORT_ST_RNN_ID: 1206 cmd = FC_NS_RNN_ID; 1207 size += sizeof(struct fc_ns_rn_id); 1208 break; 1209 case LPORT_ST_RSNN_NN: 1210 len = strnlen(fc_host_symbolic_name(lport->host), 255); 1211 /* if there is no symbolic name, skip to RFT_ID */ 1212 if (!len) 1213 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); 1214 cmd = FC_NS_RSNN_NN; 1215 size += sizeof(struct fc_ns_rsnn) + len; 1216 break; 1217 case LPORT_ST_RSPN_ID: 1218 len = strnlen(fc_host_symbolic_name(lport->host), 255); 1219 /* if there is no symbolic name, skip to RFT_ID */ 1220 if (!len) 1221 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); 1222 cmd = FC_NS_RSPN_ID; 1223 size += sizeof(struct fc_ns_rspn) + len; 1224 break; 1225 case LPORT_ST_RFT_ID: 1226 cmd = FC_NS_RFT_ID; 1227 size += sizeof(struct fc_ns_rft); 1228 break; 1229 case LPORT_ST_RFF_ID: 1230 cmd = FC_NS_RFF_ID; 1231 size += sizeof(struct fc_ns_rff_id); 1232 break; 1233 default: 1234 fc_lport_error(lport, NULL); 1235 return; 1236 } 1237 1238 fp = fc_frame_alloc(lport, size); 1239 if (!fp) { 1240 fc_lport_error(lport, fp); 1241 return; 1242 } 1243 1244 if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd, 1245 fc_lport_ns_resp, 1246 lport, 3 * lport->r_a_tov)) 1247 fc_lport_error(lport, fp); 1248 } 1249 1250 static struct fc_rport_operations fc_lport_rport_ops = { 1251 .event_callback = fc_lport_rport_callback, 1252 }; 1253 1254 /** 1255 * fc_rport_enter_dns() - Create a fc_rport for the name server 1256 * @lport: The local port requesting a remote port for the name server 1257 * 1258 * Locking Note: The lport lock is expected to be held before calling 1259 * this routine. 1260 */ 1261 static void fc_lport_enter_dns(struct fc_lport *lport) 1262 { 1263 struct fc_rport_priv *rdata; 1264 1265 FC_LPORT_DBG(lport, "Entered DNS state from %s state\n", 1266 fc_lport_state(lport)); 1267 1268 fc_lport_state_enter(lport, LPORT_ST_DNS); 1269 1270 mutex_lock(&lport->disc.disc_mutex); 1271 rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV); 1272 mutex_unlock(&lport->disc.disc_mutex); 1273 if (!rdata) 1274 goto err; 1275 1276 rdata->ops = &fc_lport_rport_ops; 1277 lport->tt.rport_login(rdata); 1278 return; 1279 1280 err: 1281 fc_lport_error(lport, NULL); 1282 } 1283 1284 /** 1285 * fc_lport_timeout() - Handler for the retry_work timer 1286 * @work: The work struct of the local port 1287 */ 1288 static void fc_lport_timeout(struct work_struct *work) 1289 { 1290 struct fc_lport *lport = 1291 container_of(work, struct fc_lport, 1292 retry_work.work); 1293 1294 mutex_lock(&lport->lp_mutex); 1295 1296 switch (lport->state) { 1297 case LPORT_ST_DISABLED: 1298 WARN_ON(1); 1299 break; 1300 case LPORT_ST_READY: 1301 WARN_ON(1); 1302 break; 1303 case LPORT_ST_RESET: 1304 break; 1305 case LPORT_ST_FLOGI: 1306 fc_lport_enter_flogi(lport); 1307 break; 1308 case LPORT_ST_DNS: 1309 fc_lport_enter_dns(lport); 1310 break; 1311 case LPORT_ST_RNN_ID: 1312 case LPORT_ST_RSNN_NN: 1313 case LPORT_ST_RSPN_ID: 1314 case LPORT_ST_RFT_ID: 1315 case LPORT_ST_RFF_ID: 1316 fc_lport_enter_ns(lport, lport->state); 1317 break; 1318 case LPORT_ST_SCR: 1319 fc_lport_enter_scr(lport); 1320 break; 1321 case LPORT_ST_LOGO: 1322 fc_lport_enter_logo(lport); 1323 break; 1324 } 1325 1326 mutex_unlock(&lport->lp_mutex); 1327 } 1328 1329 /** 1330 * fc_lport_logo_resp() - Handle response to LOGO request 1331 * @sp: The sequence that the LOGO was on 1332 * @fp: The LOGO frame 1333 * @lp_arg: The lport port that received the LOGO request 1334 * 1335 * Locking Note: This function will be called without the lport lock 1336 * held, but it will lock, call an _enter_* function or fc_lport_error() 1337 * and then unlock the lport. 1338 */ 1339 void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1340 void *lp_arg) 1341 { 1342 struct fc_lport *lport = lp_arg; 1343 u8 op; 1344 1345 FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp)); 1346 1347 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1348 return; 1349 1350 mutex_lock(&lport->lp_mutex); 1351 1352 if (lport->state != LPORT_ST_LOGO) { 1353 FC_LPORT_DBG(lport, "Received a LOGO response, but in state " 1354 "%s\n", fc_lport_state(lport)); 1355 if (IS_ERR(fp)) 1356 goto err; 1357 goto out; 1358 } 1359 1360 if (IS_ERR(fp)) { 1361 fc_lport_error(lport, fp); 1362 goto err; 1363 } 1364 1365 op = fc_frame_payload_op(fp); 1366 if (op == ELS_LS_ACC) 1367 fc_lport_enter_disabled(lport); 1368 else 1369 fc_lport_error(lport, fp); 1370 1371 out: 1372 fc_frame_free(fp); 1373 err: 1374 mutex_unlock(&lport->lp_mutex); 1375 } 1376 EXPORT_SYMBOL(fc_lport_logo_resp); 1377 1378 /** 1379 * fc_rport_enter_logo() - Logout of the fabric 1380 * @lport: The local port to be logged out 1381 * 1382 * Locking Note: The lport lock is expected to be held before calling 1383 * this routine. 1384 */ 1385 static void fc_lport_enter_logo(struct fc_lport *lport) 1386 { 1387 struct fc_frame *fp; 1388 struct fc_els_logo *logo; 1389 1390 FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n", 1391 fc_lport_state(lport)); 1392 1393 fc_lport_state_enter(lport, LPORT_ST_LOGO); 1394 fc_vports_linkchange(lport); 1395 1396 fp = fc_frame_alloc(lport, sizeof(*logo)); 1397 if (!fp) { 1398 fc_lport_error(lport, fp); 1399 return; 1400 } 1401 1402 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO, 1403 fc_lport_logo_resp, lport, 1404 2 * lport->r_a_tov)) 1405 fc_lport_error(lport, NULL); 1406 } 1407 1408 /** 1409 * fc_lport_flogi_resp() - Handle response to FLOGI request 1410 * @sp: The sequence that the FLOGI was on 1411 * @fp: The FLOGI response frame 1412 * @lp_arg: The lport port that received the FLOGI response 1413 * 1414 * Locking Note: This function will be called without the lport lock 1415 * held, but it will lock, call an _enter_* function or fc_lport_error() 1416 * and then unlock the lport. 1417 */ 1418 void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 1419 void *lp_arg) 1420 { 1421 struct fc_lport *lport = lp_arg; 1422 struct fc_els_flogi *flp; 1423 u32 did; 1424 u16 csp_flags; 1425 unsigned int r_a_tov; 1426 unsigned int e_d_tov; 1427 u16 mfs; 1428 1429 FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp)); 1430 1431 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1432 return; 1433 1434 mutex_lock(&lport->lp_mutex); 1435 1436 if (lport->state != LPORT_ST_FLOGI) { 1437 FC_LPORT_DBG(lport, "Received a FLOGI response, but in state " 1438 "%s\n", fc_lport_state(lport)); 1439 if (IS_ERR(fp)) 1440 goto err; 1441 goto out; 1442 } 1443 1444 if (IS_ERR(fp)) { 1445 fc_lport_error(lport, fp); 1446 goto err; 1447 } 1448 1449 did = fc_frame_did(fp); 1450 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did) { 1451 flp = fc_frame_payload_get(fp, sizeof(*flp)); 1452 if (flp) { 1453 mfs = ntohs(flp->fl_csp.sp_bb_data) & 1454 FC_SP_BB_DATA_MASK; 1455 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && 1456 mfs < lport->mfs) 1457 lport->mfs = mfs; 1458 csp_flags = ntohs(flp->fl_csp.sp_features); 1459 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); 1460 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); 1461 if (csp_flags & FC_SP_FT_EDTR) 1462 e_d_tov /= 1000000; 1463 1464 lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC); 1465 1466 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1467 if (e_d_tov > lport->e_d_tov) 1468 lport->e_d_tov = e_d_tov; 1469 lport->r_a_tov = 2 * e_d_tov; 1470 fc_lport_set_port_id(lport, did, fp); 1471 printk(KERN_INFO "host%d: libfc: " 1472 "Port (%6.6x) entered " 1473 "point-to-point mode\n", 1474 lport->host->host_no, did); 1475 fc_lport_ptp_setup(lport, fc_frame_sid(fp), 1476 get_unaligned_be64( 1477 &flp->fl_wwpn), 1478 get_unaligned_be64( 1479 &flp->fl_wwnn)); 1480 } else { 1481 lport->e_d_tov = e_d_tov; 1482 lport->r_a_tov = r_a_tov; 1483 fc_host_fabric_name(lport->host) = 1484 get_unaligned_be64(&flp->fl_wwnn); 1485 fc_lport_set_port_id(lport, did, fp); 1486 fc_lport_enter_dns(lport); 1487 } 1488 } 1489 } else { 1490 FC_LPORT_DBG(lport, "FLOGI RJT or bad response\n"); 1491 fc_lport_error(lport, fp); 1492 } 1493 1494 out: 1495 fc_frame_free(fp); 1496 err: 1497 mutex_unlock(&lport->lp_mutex); 1498 } 1499 EXPORT_SYMBOL(fc_lport_flogi_resp); 1500 1501 /** 1502 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager 1503 * @lport: Fibre Channel local port to be logged in to the fabric 1504 * 1505 * Locking Note: The lport lock is expected to be held before calling 1506 * this routine. 1507 */ 1508 void fc_lport_enter_flogi(struct fc_lport *lport) 1509 { 1510 struct fc_frame *fp; 1511 1512 FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n", 1513 fc_lport_state(lport)); 1514 1515 fc_lport_state_enter(lport, LPORT_ST_FLOGI); 1516 1517 if (lport->point_to_multipoint) { 1518 if (lport->port_id) 1519 fc_lport_enter_ready(lport); 1520 return; 1521 } 1522 1523 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 1524 if (!fp) 1525 return fc_lport_error(lport, fp); 1526 1527 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, 1528 lport->vport ? ELS_FDISC : ELS_FLOGI, 1529 fc_lport_flogi_resp, lport, 1530 lport->vport ? 2 * lport->r_a_tov : 1531 lport->e_d_tov)) 1532 fc_lport_error(lport, NULL); 1533 } 1534 1535 /** 1536 * fc_lport_config() - Configure a fc_lport 1537 * @lport: The local port to be configured 1538 */ 1539 int fc_lport_config(struct fc_lport *lport) 1540 { 1541 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); 1542 mutex_init(&lport->lp_mutex); 1543 1544 fc_lport_state_enter(lport, LPORT_ST_DISABLED); 1545 1546 fc_lport_add_fc4_type(lport, FC_TYPE_FCP); 1547 fc_lport_add_fc4_type(lport, FC_TYPE_CT); 1548 1549 return 0; 1550 } 1551 EXPORT_SYMBOL(fc_lport_config); 1552 1553 /** 1554 * fc_lport_init() - Initialize the lport layer for a local port 1555 * @lport: The local port to initialize the exchange layer for 1556 */ 1557 int fc_lport_init(struct fc_lport *lport) 1558 { 1559 if (!lport->tt.lport_recv) 1560 lport->tt.lport_recv = fc_lport_recv_req; 1561 1562 if (!lport->tt.lport_reset) 1563 lport->tt.lport_reset = fc_lport_reset; 1564 1565 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; 1566 fc_host_node_name(lport->host) = lport->wwnn; 1567 fc_host_port_name(lport->host) = lport->wwpn; 1568 fc_host_supported_classes(lport->host) = FC_COS_CLASS3; 1569 memset(fc_host_supported_fc4s(lport->host), 0, 1570 sizeof(fc_host_supported_fc4s(lport->host))); 1571 fc_host_supported_fc4s(lport->host)[2] = 1; 1572 fc_host_supported_fc4s(lport->host)[7] = 1; 1573 1574 /* This value is also unchanging */ 1575 memset(fc_host_active_fc4s(lport->host), 0, 1576 sizeof(fc_host_active_fc4s(lport->host))); 1577 fc_host_active_fc4s(lport->host)[2] = 1; 1578 fc_host_active_fc4s(lport->host)[7] = 1; 1579 fc_host_maxframe_size(lport->host) = lport->mfs; 1580 fc_host_supported_speeds(lport->host) = 0; 1581 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) 1582 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; 1583 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) 1584 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; 1585 1586 return 0; 1587 } 1588 EXPORT_SYMBOL(fc_lport_init); 1589 1590 /** 1591 * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests 1592 * @sp: The sequence for the FC Passthrough response 1593 * @fp: The response frame 1594 * @info_arg: The BSG info that the response is for 1595 */ 1596 static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp, 1597 void *info_arg) 1598 { 1599 struct fc_bsg_info *info = info_arg; 1600 struct fc_bsg_job *job = info->job; 1601 struct fc_lport *lport = info->lport; 1602 struct fc_frame_header *fh; 1603 size_t len; 1604 void *buf; 1605 1606 if (IS_ERR(fp)) { 1607 job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ? 1608 -ECONNABORTED : -ETIMEDOUT; 1609 job->reply_len = sizeof(uint32_t); 1610 job->state_flags |= FC_RQST_STATE_DONE; 1611 job->job_done(job); 1612 kfree(info); 1613 return; 1614 } 1615 1616 mutex_lock(&lport->lp_mutex); 1617 fh = fc_frame_header_get(fp); 1618 len = fr_len(fp) - sizeof(*fh); 1619 buf = fc_frame_payload_get(fp, 0); 1620 1621 if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) { 1622 /* Get the response code from the first frame payload */ 1623 unsigned short cmd = (info->rsp_code == FC_FS_ACC) ? 1624 ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) : 1625 (unsigned short)fc_frame_payload_op(fp); 1626 1627 /* Save the reply status of the job */ 1628 job->reply->reply_data.ctels_reply.status = 1629 (cmd == info->rsp_code) ? 1630 FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT; 1631 } 1632 1633 job->reply->reply_payload_rcv_len += 1634 fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents, 1635 &info->offset, KM_BIO_SRC_IRQ, NULL); 1636 1637 if (fr_eof(fp) == FC_EOF_T && 1638 (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == 1639 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { 1640 if (job->reply->reply_payload_rcv_len > 1641 job->reply_payload.payload_len) 1642 job->reply->reply_payload_rcv_len = 1643 job->reply_payload.payload_len; 1644 job->reply->result = 0; 1645 job->state_flags |= FC_RQST_STATE_DONE; 1646 job->job_done(job); 1647 kfree(info); 1648 } 1649 fc_frame_free(fp); 1650 mutex_unlock(&lport->lp_mutex); 1651 } 1652 1653 /** 1654 * fc_lport_els_request() - Send ELS passthrough request 1655 * @job: The BSG Passthrough job 1656 * @lport: The local port sending the request 1657 * @did: The destination port id 1658 * 1659 * Locking Note: The lport lock is expected to be held before calling 1660 * this routine. 1661 */ 1662 static int fc_lport_els_request(struct fc_bsg_job *job, 1663 struct fc_lport *lport, 1664 u32 did, u32 tov) 1665 { 1666 struct fc_bsg_info *info; 1667 struct fc_frame *fp; 1668 struct fc_frame_header *fh; 1669 char *pp; 1670 int len; 1671 1672 fp = fc_frame_alloc(lport, job->request_payload.payload_len); 1673 if (!fp) 1674 return -ENOMEM; 1675 1676 len = job->request_payload.payload_len; 1677 pp = fc_frame_payload_get(fp, len); 1678 1679 sg_copy_to_buffer(job->request_payload.sg_list, 1680 job->request_payload.sg_cnt, 1681 pp, len); 1682 1683 fh = fc_frame_header_get(fp); 1684 fh->fh_r_ctl = FC_RCTL_ELS_REQ; 1685 hton24(fh->fh_d_id, did); 1686 hton24(fh->fh_s_id, lport->port_id); 1687 fh->fh_type = FC_TYPE_ELS; 1688 hton24(fh->fh_f_ctl, FC_FCTL_REQ); 1689 fh->fh_cs_ctl = 0; 1690 fh->fh_df_ctl = 0; 1691 fh->fh_parm_offset = 0; 1692 1693 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL); 1694 if (!info) { 1695 fc_frame_free(fp); 1696 return -ENOMEM; 1697 } 1698 1699 info->job = job; 1700 info->lport = lport; 1701 info->rsp_code = ELS_LS_ACC; 1702 info->nents = job->reply_payload.sg_cnt; 1703 info->sg = job->reply_payload.sg_list; 1704 1705 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp, 1706 NULL, info, tov)) 1707 return -ECOMM; 1708 return 0; 1709 } 1710 1711 /** 1712 * fc_lport_ct_request() - Send CT Passthrough request 1713 * @job: The BSG Passthrough job 1714 * @lport: The local port sending the request 1715 * @did: The destination FC-ID 1716 * @tov: The timeout period to wait for the response 1717 * 1718 * Locking Note: The lport lock is expected to be held before calling 1719 * this routine. 1720 */ 1721 static int fc_lport_ct_request(struct fc_bsg_job *job, 1722 struct fc_lport *lport, u32 did, u32 tov) 1723 { 1724 struct fc_bsg_info *info; 1725 struct fc_frame *fp; 1726 struct fc_frame_header *fh; 1727 struct fc_ct_req *ct; 1728 size_t len; 1729 1730 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1731 job->request_payload.payload_len); 1732 if (!fp) 1733 return -ENOMEM; 1734 1735 len = job->request_payload.payload_len; 1736 ct = fc_frame_payload_get(fp, len); 1737 1738 sg_copy_to_buffer(job->request_payload.sg_list, 1739 job->request_payload.sg_cnt, 1740 ct, len); 1741 1742 fh = fc_frame_header_get(fp); 1743 fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL; 1744 hton24(fh->fh_d_id, did); 1745 hton24(fh->fh_s_id, lport->port_id); 1746 fh->fh_type = FC_TYPE_CT; 1747 hton24(fh->fh_f_ctl, FC_FCTL_REQ); 1748 fh->fh_cs_ctl = 0; 1749 fh->fh_df_ctl = 0; 1750 fh->fh_parm_offset = 0; 1751 1752 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL); 1753 if (!info) { 1754 fc_frame_free(fp); 1755 return -ENOMEM; 1756 } 1757 1758 info->job = job; 1759 info->lport = lport; 1760 info->rsp_code = FC_FS_ACC; 1761 info->nents = job->reply_payload.sg_cnt; 1762 info->sg = job->reply_payload.sg_list; 1763 1764 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp, 1765 NULL, info, tov)) 1766 return -ECOMM; 1767 return 0; 1768 } 1769 1770 /** 1771 * fc_lport_bsg_request() - The common entry point for sending 1772 * FC Passthrough requests 1773 * @job: The BSG passthrough job 1774 */ 1775 int fc_lport_bsg_request(struct fc_bsg_job *job) 1776 { 1777 struct request *rsp = job->req->next_rq; 1778 struct Scsi_Host *shost = job->shost; 1779 struct fc_lport *lport = shost_priv(shost); 1780 struct fc_rport *rport; 1781 struct fc_rport_priv *rdata; 1782 int rc = -EINVAL; 1783 u32 did; 1784 1785 job->reply->reply_payload_rcv_len = 0; 1786 if (rsp) 1787 rsp->resid_len = job->reply_payload.payload_len; 1788 1789 mutex_lock(&lport->lp_mutex); 1790 1791 switch (job->request->msgcode) { 1792 case FC_BSG_RPT_ELS: 1793 rport = job->rport; 1794 if (!rport) 1795 break; 1796 1797 rdata = rport->dd_data; 1798 rc = fc_lport_els_request(job, lport, rport->port_id, 1799 rdata->e_d_tov); 1800 break; 1801 1802 case FC_BSG_RPT_CT: 1803 rport = job->rport; 1804 if (!rport) 1805 break; 1806 1807 rdata = rport->dd_data; 1808 rc = fc_lport_ct_request(job, lport, rport->port_id, 1809 rdata->e_d_tov); 1810 break; 1811 1812 case FC_BSG_HST_CT: 1813 did = ntoh24(job->request->rqst_data.h_ct.port_id); 1814 if (did == FC_FID_DIR_SERV) 1815 rdata = lport->dns_rdata; 1816 else 1817 rdata = lport->tt.rport_lookup(lport, did); 1818 1819 if (!rdata) 1820 break; 1821 1822 rc = fc_lport_ct_request(job, lport, did, rdata->e_d_tov); 1823 break; 1824 1825 case FC_BSG_HST_ELS_NOLOGIN: 1826 did = ntoh24(job->request->rqst_data.h_els.port_id); 1827 rc = fc_lport_els_request(job, lport, did, lport->e_d_tov); 1828 break; 1829 } 1830 1831 mutex_unlock(&lport->lp_mutex); 1832 return rc; 1833 } 1834 EXPORT_SYMBOL(fc_lport_bsg_request); 1835