1 /* 2 * Copyright(c) 2007 - 2008 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 * RPORT GENERAL INFO 22 * 23 * This file contains all processing regarding fc_rports. It contains the 24 * rport state machine and does all rport interaction with the transport class. 25 * There should be no other places in libfc that interact directly with the 26 * transport class in regards to adding and deleting rports. 27 * 28 * fc_rport's represent N_Port's within the fabric. 29 */ 30 31 /* 32 * RPORT LOCKING 33 * 34 * The rport should never hold the rport mutex and then attempt to acquire 35 * either the lport or disc mutexes. The rport's mutex is considered lesser 36 * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for 37 * more comments on the heirarchy. 38 * 39 * The locking strategy is similar to the lport's strategy. The lock protects 40 * the rport's states and is held and released by the entry points to the rport 41 * block. All _enter_* functions correspond to rport states and expect the rport 42 * mutex to be locked before calling them. This means that rports only handle 43 * one request or response at a time, since they're not critical for the I/O 44 * path this potential over-use of the mutex is acceptable. 45 */ 46 47 #include <linux/kernel.h> 48 #include <linux/spinlock.h> 49 #include <linux/interrupt.h> 50 #include <linux/slab.h> 51 #include <linux/rcupdate.h> 52 #include <linux/timer.h> 53 #include <linux/workqueue.h> 54 #include <asm/unaligned.h> 55 56 #include <scsi/libfc.h> 57 #include <scsi/fc_encode.h> 58 59 #include "fc_libfc.h" 60 61 struct workqueue_struct *rport_event_queue; 62 63 static void fc_rport_enter_flogi(struct fc_rport_priv *); 64 static void fc_rport_enter_plogi(struct fc_rport_priv *); 65 static void fc_rport_enter_prli(struct fc_rport_priv *); 66 static void fc_rport_enter_rtv(struct fc_rport_priv *); 67 static void fc_rport_enter_ready(struct fc_rport_priv *); 68 static void fc_rport_enter_logo(struct fc_rport_priv *); 69 static void fc_rport_enter_adisc(struct fc_rport_priv *); 70 71 static void fc_rport_recv_plogi_req(struct fc_lport *, 72 struct fc_seq *, struct fc_frame *); 73 static void fc_rport_recv_prli_req(struct fc_rport_priv *, 74 struct fc_seq *, struct fc_frame *); 75 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, 76 struct fc_seq *, struct fc_frame *); 77 static void fc_rport_recv_logo_req(struct fc_lport *, 78 struct fc_seq *, struct fc_frame *); 79 static void fc_rport_timeout(struct work_struct *); 80 static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); 81 static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); 82 static void fc_rport_work(struct work_struct *); 83 84 static const char *fc_rport_state_names[] = { 85 [RPORT_ST_INIT] = "Init", 86 [RPORT_ST_FLOGI] = "FLOGI", 87 [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT", 88 [RPORT_ST_PLOGI] = "PLOGI", 89 [RPORT_ST_PRLI] = "PRLI", 90 [RPORT_ST_RTV] = "RTV", 91 [RPORT_ST_READY] = "Ready", 92 [RPORT_ST_LOGO] = "LOGO", 93 [RPORT_ST_ADISC] = "ADISC", 94 [RPORT_ST_DELETE] = "Delete", 95 }; 96 97 /** 98 * fc_rport_lookup() - Lookup a remote port by port_id 99 * @lport: The local port to lookup the remote port on 100 * @port_id: The remote port ID to look up 101 * 102 * The caller must hold either disc_mutex or rcu_read_lock(). 103 */ 104 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, 105 u32 port_id) 106 { 107 struct fc_rport_priv *rdata; 108 109 list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) 110 if (rdata->ids.port_id == port_id) 111 return rdata; 112 return NULL; 113 } 114 115 /** 116 * fc_rport_create() - Create a new remote port 117 * @lport: The local port this remote port will be associated with 118 * @ids: The identifiers for the new remote port 119 * 120 * The remote port will start in the INIT state. 121 * 122 * Locking note: must be called with the disc_mutex held. 123 */ 124 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, 125 u32 port_id) 126 { 127 struct fc_rport_priv *rdata; 128 129 rdata = lport->tt.rport_lookup(lport, port_id); 130 if (rdata) 131 return rdata; 132 133 rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL); 134 if (!rdata) 135 return NULL; 136 137 rdata->ids.node_name = -1; 138 rdata->ids.port_name = -1; 139 rdata->ids.port_id = port_id; 140 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 141 142 kref_init(&rdata->kref); 143 mutex_init(&rdata->rp_mutex); 144 rdata->local_port = lport; 145 rdata->rp_state = RPORT_ST_INIT; 146 rdata->event = RPORT_EV_NONE; 147 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; 148 rdata->e_d_tov = lport->e_d_tov; 149 rdata->r_a_tov = lport->r_a_tov; 150 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 151 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); 152 INIT_WORK(&rdata->event_work, fc_rport_work); 153 if (port_id != FC_FID_DIR_SERV) 154 list_add_rcu(&rdata->peers, &lport->disc.rports); 155 return rdata; 156 } 157 158 /** 159 * fc_rport_free_rcu() - Free a remote port 160 * @rcu: The rcu_head structure inside the remote port 161 */ 162 static void fc_rport_free_rcu(struct rcu_head *rcu) 163 { 164 struct fc_rport_priv *rdata; 165 166 rdata = container_of(rcu, struct fc_rport_priv, rcu); 167 kfree(rdata); 168 } 169 170 /** 171 * fc_rport_destroy() - Free a remote port after last reference is released 172 * @kref: The remote port's kref 173 */ 174 static void fc_rport_destroy(struct kref *kref) 175 { 176 struct fc_rport_priv *rdata; 177 178 rdata = container_of(kref, struct fc_rport_priv, kref); 179 call_rcu(&rdata->rcu, fc_rport_free_rcu); 180 } 181 182 /** 183 * fc_rport_state() - Return a string identifying the remote port's state 184 * @rdata: The remote port 185 */ 186 static const char *fc_rport_state(struct fc_rport_priv *rdata) 187 { 188 const char *cp; 189 190 cp = fc_rport_state_names[rdata->rp_state]; 191 if (!cp) 192 cp = "Unknown"; 193 return cp; 194 } 195 196 /** 197 * fc_set_rport_loss_tmo() - Set the remote port loss timeout 198 * @rport: The remote port that gets a new timeout value 199 * @timeout: The new timeout value (in seconds) 200 */ 201 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) 202 { 203 if (timeout) 204 rport->dev_loss_tmo = timeout + 5; 205 else 206 rport->dev_loss_tmo = 30; 207 } 208 EXPORT_SYMBOL(fc_set_rport_loss_tmo); 209 210 /** 211 * fc_plogi_get_maxframe() - Get the maximum payload from the common service 212 * parameters in a FLOGI frame 213 * @flp: The FLOGI or PLOGI payload 214 * @maxval: The maximum frame size upper limit; this may be less than what 215 * is in the service parameters 216 */ 217 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, 218 unsigned int maxval) 219 { 220 unsigned int mfs; 221 222 /* 223 * Get max payload from the common service parameters and the 224 * class 3 receive data field size. 225 */ 226 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; 227 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 228 maxval = mfs; 229 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); 230 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 231 maxval = mfs; 232 return maxval; 233 } 234 235 /** 236 * fc_rport_state_enter() - Change the state of a remote port 237 * @rdata: The remote port whose state should change 238 * @new: The new state 239 * 240 * Locking Note: Called with the rport lock held 241 */ 242 static void fc_rport_state_enter(struct fc_rport_priv *rdata, 243 enum fc_rport_state new) 244 { 245 if (rdata->rp_state != new) 246 rdata->retries = 0; 247 rdata->rp_state = new; 248 } 249 250 /** 251 * fc_rport_work() - Handler for remote port events in the rport_event_queue 252 * @work: Handle to the remote port being dequeued 253 */ 254 static void fc_rport_work(struct work_struct *work) 255 { 256 u32 port_id; 257 struct fc_rport_priv *rdata = 258 container_of(work, struct fc_rport_priv, event_work); 259 struct fc_rport_libfc_priv *rpriv; 260 enum fc_rport_event event; 261 struct fc_lport *lport = rdata->local_port; 262 struct fc_rport_operations *rport_ops; 263 struct fc_rport_identifiers ids; 264 struct fc_rport *rport; 265 266 mutex_lock(&rdata->rp_mutex); 267 event = rdata->event; 268 rport_ops = rdata->ops; 269 rport = rdata->rport; 270 271 FC_RPORT_DBG(rdata, "work event %u\n", event); 272 273 switch (event) { 274 case RPORT_EV_READY: 275 ids = rdata->ids; 276 rdata->event = RPORT_EV_NONE; 277 rdata->major_retries = 0; 278 kref_get(&rdata->kref); 279 mutex_unlock(&rdata->rp_mutex); 280 281 if (!rport) 282 rport = fc_remote_port_add(lport->host, 0, &ids); 283 if (!rport) { 284 FC_RPORT_DBG(rdata, "Failed to add the rport\n"); 285 lport->tt.rport_logoff(rdata); 286 kref_put(&rdata->kref, lport->tt.rport_destroy); 287 return; 288 } 289 mutex_lock(&rdata->rp_mutex); 290 if (rdata->rport) 291 FC_RPORT_DBG(rdata, "rport already allocated\n"); 292 rdata->rport = rport; 293 rport->maxframe_size = rdata->maxframe_size; 294 rport->supported_classes = rdata->supported_classes; 295 296 rpriv = rport->dd_data; 297 rpriv->local_port = lport; 298 rpriv->rp_state = rdata->rp_state; 299 rpriv->flags = rdata->flags; 300 rpriv->e_d_tov = rdata->e_d_tov; 301 rpriv->r_a_tov = rdata->r_a_tov; 302 mutex_unlock(&rdata->rp_mutex); 303 304 if (rport_ops && rport_ops->event_callback) { 305 FC_RPORT_DBG(rdata, "callback ev %d\n", event); 306 rport_ops->event_callback(lport, rdata, event); 307 } 308 kref_put(&rdata->kref, lport->tt.rport_destroy); 309 break; 310 311 case RPORT_EV_FAILED: 312 case RPORT_EV_LOGO: 313 case RPORT_EV_STOP: 314 port_id = rdata->ids.port_id; 315 mutex_unlock(&rdata->rp_mutex); 316 317 if (rport_ops && rport_ops->event_callback) { 318 FC_RPORT_DBG(rdata, "callback ev %d\n", event); 319 rport_ops->event_callback(lport, rdata, event); 320 } 321 cancel_delayed_work_sync(&rdata->retry_work); 322 323 /* 324 * Reset any outstanding exchanges before freeing rport. 325 */ 326 lport->tt.exch_mgr_reset(lport, 0, port_id); 327 lport->tt.exch_mgr_reset(lport, port_id, 0); 328 329 if (rport) { 330 rpriv = rport->dd_data; 331 rpriv->rp_state = RPORT_ST_DELETE; 332 mutex_lock(&rdata->rp_mutex); 333 rdata->rport = NULL; 334 mutex_unlock(&rdata->rp_mutex); 335 fc_remote_port_delete(rport); 336 } 337 338 mutex_lock(&lport->disc.disc_mutex); 339 mutex_lock(&rdata->rp_mutex); 340 if (rdata->rp_state == RPORT_ST_DELETE) { 341 if (port_id == FC_FID_DIR_SERV) { 342 rdata->event = RPORT_EV_NONE; 343 mutex_unlock(&rdata->rp_mutex); 344 } else if ((rdata->flags & FC_RP_STARTED) && 345 rdata->major_retries < 346 lport->max_rport_retry_count) { 347 rdata->major_retries++; 348 rdata->event = RPORT_EV_NONE; 349 FC_RPORT_DBG(rdata, "work restart\n"); 350 fc_rport_enter_flogi(rdata); 351 mutex_unlock(&rdata->rp_mutex); 352 } else { 353 FC_RPORT_DBG(rdata, "work delete\n"); 354 list_del_rcu(&rdata->peers); 355 mutex_unlock(&rdata->rp_mutex); 356 kref_put(&rdata->kref, lport->tt.rport_destroy); 357 } 358 } else { 359 /* 360 * Re-open for events. Reissue READY event if ready. 361 */ 362 rdata->event = RPORT_EV_NONE; 363 if (rdata->rp_state == RPORT_ST_READY) 364 fc_rport_enter_ready(rdata); 365 mutex_unlock(&rdata->rp_mutex); 366 } 367 mutex_unlock(&lport->disc.disc_mutex); 368 break; 369 370 default: 371 mutex_unlock(&rdata->rp_mutex); 372 break; 373 } 374 } 375 376 /** 377 * fc_rport_login() - Start the remote port login state machine 378 * @rdata: The remote port to be logged in to 379 * 380 * Locking Note: Called without the rport lock held. This 381 * function will hold the rport lock, call an _enter_* 382 * function and then unlock the rport. 383 * 384 * This indicates the intent to be logged into the remote port. 385 * If it appears we are already logged in, ADISC is used to verify 386 * the setup. 387 */ 388 int fc_rport_login(struct fc_rport_priv *rdata) 389 { 390 mutex_lock(&rdata->rp_mutex); 391 392 rdata->flags |= FC_RP_STARTED; 393 switch (rdata->rp_state) { 394 case RPORT_ST_READY: 395 FC_RPORT_DBG(rdata, "ADISC port\n"); 396 fc_rport_enter_adisc(rdata); 397 break; 398 case RPORT_ST_DELETE: 399 FC_RPORT_DBG(rdata, "Restart deleted port\n"); 400 break; 401 default: 402 FC_RPORT_DBG(rdata, "Login to port\n"); 403 fc_rport_enter_flogi(rdata); 404 break; 405 } 406 mutex_unlock(&rdata->rp_mutex); 407 408 return 0; 409 } 410 411 /** 412 * fc_rport_enter_delete() - Schedule a remote port to be deleted 413 * @rdata: The remote port to be deleted 414 * @event: The event to report as the reason for deletion 415 * 416 * Locking Note: Called with the rport lock held. 417 * 418 * Allow state change into DELETE only once. 419 * 420 * Call queue_work only if there's no event already pending. 421 * Set the new event so that the old pending event will not occur. 422 * Since we have the mutex, even if fc_rport_work() is already started, 423 * it'll see the new event. 424 */ 425 static void fc_rport_enter_delete(struct fc_rport_priv *rdata, 426 enum fc_rport_event event) 427 { 428 if (rdata->rp_state == RPORT_ST_DELETE) 429 return; 430 431 FC_RPORT_DBG(rdata, "Delete port\n"); 432 433 fc_rport_state_enter(rdata, RPORT_ST_DELETE); 434 435 if (rdata->event == RPORT_EV_NONE) 436 queue_work(rport_event_queue, &rdata->event_work); 437 rdata->event = event; 438 } 439 440 /** 441 * fc_rport_logoff() - Logoff and remove a remote port 442 * @rdata: The remote port to be logged off of 443 * 444 * Locking Note: Called without the rport lock held. This 445 * function will hold the rport lock, call an _enter_* 446 * function and then unlock the rport. 447 */ 448 int fc_rport_logoff(struct fc_rport_priv *rdata) 449 { 450 mutex_lock(&rdata->rp_mutex); 451 452 FC_RPORT_DBG(rdata, "Remove port\n"); 453 454 rdata->flags &= ~FC_RP_STARTED; 455 if (rdata->rp_state == RPORT_ST_DELETE) { 456 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); 457 goto out; 458 } 459 fc_rport_enter_logo(rdata); 460 461 /* 462 * Change the state to Delete so that we discard 463 * the response. 464 */ 465 fc_rport_enter_delete(rdata, RPORT_EV_STOP); 466 out: 467 mutex_unlock(&rdata->rp_mutex); 468 return 0; 469 } 470 471 /** 472 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state 473 * @rdata: The remote port that is ready 474 * 475 * Locking Note: The rport lock is expected to be held before calling 476 * this routine. 477 */ 478 static void fc_rport_enter_ready(struct fc_rport_priv *rdata) 479 { 480 fc_rport_state_enter(rdata, RPORT_ST_READY); 481 482 FC_RPORT_DBG(rdata, "Port is Ready\n"); 483 484 if (rdata->event == RPORT_EV_NONE) 485 queue_work(rport_event_queue, &rdata->event_work); 486 rdata->event = RPORT_EV_READY; 487 } 488 489 /** 490 * fc_rport_timeout() - Handler for the retry_work timer 491 * @work: Handle to the remote port that has timed out 492 * 493 * Locking Note: Called without the rport lock held. This 494 * function will hold the rport lock, call an _enter_* 495 * function and then unlock the rport. 496 */ 497 static void fc_rport_timeout(struct work_struct *work) 498 { 499 struct fc_rport_priv *rdata = 500 container_of(work, struct fc_rport_priv, retry_work.work); 501 502 mutex_lock(&rdata->rp_mutex); 503 504 switch (rdata->rp_state) { 505 case RPORT_ST_FLOGI: 506 fc_rport_enter_flogi(rdata); 507 break; 508 case RPORT_ST_PLOGI: 509 fc_rport_enter_plogi(rdata); 510 break; 511 case RPORT_ST_PRLI: 512 fc_rport_enter_prli(rdata); 513 break; 514 case RPORT_ST_RTV: 515 fc_rport_enter_rtv(rdata); 516 break; 517 case RPORT_ST_LOGO: 518 fc_rport_enter_logo(rdata); 519 break; 520 case RPORT_ST_ADISC: 521 fc_rport_enter_adisc(rdata); 522 break; 523 case RPORT_ST_PLOGI_WAIT: 524 case RPORT_ST_READY: 525 case RPORT_ST_INIT: 526 case RPORT_ST_DELETE: 527 break; 528 } 529 530 mutex_unlock(&rdata->rp_mutex); 531 } 532 533 /** 534 * fc_rport_error() - Error handler, called once retries have been exhausted 535 * @rdata: The remote port the error is happened on 536 * @fp: The error code encapsulated in a frame pointer 537 * 538 * Locking Note: The rport lock is expected to be held before 539 * calling this routine 540 */ 541 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) 542 { 543 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", 544 IS_ERR(fp) ? -PTR_ERR(fp) : 0, 545 fc_rport_state(rdata), rdata->retries); 546 547 switch (rdata->rp_state) { 548 case RPORT_ST_FLOGI: 549 case RPORT_ST_PLOGI: 550 case RPORT_ST_LOGO: 551 rdata->flags &= ~FC_RP_STARTED; 552 fc_rport_enter_delete(rdata, RPORT_EV_FAILED); 553 break; 554 case RPORT_ST_RTV: 555 fc_rport_enter_ready(rdata); 556 break; 557 case RPORT_ST_PRLI: 558 case RPORT_ST_ADISC: 559 fc_rport_enter_logo(rdata); 560 break; 561 case RPORT_ST_PLOGI_WAIT: 562 case RPORT_ST_DELETE: 563 case RPORT_ST_READY: 564 case RPORT_ST_INIT: 565 break; 566 } 567 } 568 569 /** 570 * fc_rport_error_retry() - Handler for remote port state retries 571 * @rdata: The remote port whose state is to be retried 572 * @fp: The error code encapsulated in a frame pointer 573 * 574 * If the error was an exchange timeout retry immediately, 575 * otherwise wait for E_D_TOV. 576 * 577 * Locking Note: The rport lock is expected to be held before 578 * calling this routine 579 */ 580 static void fc_rport_error_retry(struct fc_rport_priv *rdata, 581 struct fc_frame *fp) 582 { 583 unsigned long delay = FC_DEF_E_D_TOV; 584 585 /* make sure this isn't an FC_EX_CLOSED error, never retry those */ 586 if (PTR_ERR(fp) == -FC_EX_CLOSED) 587 return fc_rport_error(rdata, fp); 588 589 if (rdata->retries < rdata->local_port->max_rport_retry_count) { 590 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", 591 PTR_ERR(fp), fc_rport_state(rdata)); 592 rdata->retries++; 593 /* no additional delay on exchange timeouts */ 594 if (PTR_ERR(fp) == -FC_EX_TIMEOUT) 595 delay = 0; 596 schedule_delayed_work(&rdata->retry_work, delay); 597 return; 598 } 599 600 return fc_rport_error(rdata, fp); 601 } 602 603 /** 604 * fc_rport_login_complete() - Handle parameters and completion of p-mp login. 605 * @rdata: The remote port which we logged into or which logged into us. 606 * @fp: The FLOGI or PLOGI request or response frame 607 * 608 * Returns non-zero error if a problem is detected with the frame. 609 * Does not free the frame. 610 * 611 * This is only used in point-to-multipoint mode for FIP currently. 612 */ 613 static int fc_rport_login_complete(struct fc_rport_priv *rdata, 614 struct fc_frame *fp) 615 { 616 struct fc_lport *lport = rdata->local_port; 617 struct fc_els_flogi *flogi; 618 unsigned int e_d_tov; 619 u16 csp_flags; 620 621 flogi = fc_frame_payload_get(fp, sizeof(*flogi)); 622 if (!flogi) 623 return -EINVAL; 624 625 csp_flags = ntohs(flogi->fl_csp.sp_features); 626 627 if (fc_frame_payload_op(fp) == ELS_FLOGI) { 628 if (csp_flags & FC_SP_FT_FPORT) { 629 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n"); 630 return -EINVAL; 631 } 632 } else { 633 634 /* 635 * E_D_TOV is not valid on an incoming FLOGI request. 636 */ 637 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov); 638 if (csp_flags & FC_SP_FT_EDTR) 639 e_d_tov /= 1000000; 640 if (e_d_tov > rdata->e_d_tov) 641 rdata->e_d_tov = e_d_tov; 642 } 643 rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs); 644 return 0; 645 } 646 647 /** 648 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode 649 * @sp: The sequence that the FLOGI was on 650 * @fp: The FLOGI response frame 651 * @rp_arg: The remote port that received the FLOGI response 652 */ 653 void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 654 void *rp_arg) 655 { 656 struct fc_rport_priv *rdata = rp_arg; 657 struct fc_lport *lport = rdata->local_port; 658 struct fc_els_flogi *flogi; 659 unsigned int r_a_tov; 660 661 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp)); 662 663 if (fp == ERR_PTR(-FC_EX_CLOSED)) 664 return; 665 666 mutex_lock(&rdata->rp_mutex); 667 668 if (rdata->rp_state != RPORT_ST_FLOGI) { 669 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state " 670 "%s\n", fc_rport_state(rdata)); 671 if (IS_ERR(fp)) 672 goto err; 673 goto out; 674 } 675 676 if (IS_ERR(fp)) { 677 fc_rport_error(rdata, fp); 678 goto err; 679 } 680 681 if (fc_frame_payload_op(fp) != ELS_LS_ACC) 682 goto bad; 683 if (fc_rport_login_complete(rdata, fp)) 684 goto bad; 685 686 flogi = fc_frame_payload_get(fp, sizeof(*flogi)); 687 if (!flogi) 688 goto bad; 689 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov); 690 if (r_a_tov > rdata->r_a_tov) 691 rdata->r_a_tov = r_a_tov; 692 693 if (rdata->ids.port_name < lport->wwpn) 694 fc_rport_enter_plogi(rdata); 695 else 696 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); 697 out: 698 fc_frame_free(fp); 699 err: 700 mutex_unlock(&rdata->rp_mutex); 701 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 702 return; 703 bad: 704 FC_RPORT_DBG(rdata, "Bad FLOGI response\n"); 705 fc_rport_error_retry(rdata, fp); 706 goto out; 707 } 708 709 /** 710 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp 711 * @rdata: The remote port to send a FLOGI to 712 * 713 * Locking Note: The rport lock is expected to be held before calling 714 * this routine. 715 */ 716 static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) 717 { 718 struct fc_lport *lport = rdata->local_port; 719 struct fc_frame *fp; 720 721 if (!lport->point_to_multipoint) 722 return fc_rport_enter_plogi(rdata); 723 724 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n", 725 fc_rport_state(rdata)); 726 727 fc_rport_state_enter(rdata, RPORT_ST_FLOGI); 728 729 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 730 if (!fp) 731 return fc_rport_error_retry(rdata, fp); 732 733 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI, 734 fc_rport_flogi_resp, rdata, 735 2 * lport->r_a_tov)) 736 fc_rport_error_retry(rdata, NULL); 737 else 738 kref_get(&rdata->kref); 739 } 740 741 /** 742 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode 743 * @lport: The local port that received the PLOGI request 744 * @sp: The sequence that the PLOGI request was on 745 * @rx_fp: The PLOGI request frame 746 */ 747 static void fc_rport_recv_flogi_req(struct fc_lport *lport, 748 struct fc_seq *sp, struct fc_frame *rx_fp) 749 { 750 struct fc_disc *disc; 751 struct fc_els_flogi *flp; 752 struct fc_rport_priv *rdata; 753 struct fc_frame *fp = rx_fp; 754 struct fc_exch *ep; 755 struct fc_frame_header *fh; 756 struct fc_seq_els_data rjt_data; 757 u32 sid, f_ctl; 758 759 rjt_data.fp = NULL; 760 fh = fc_frame_header_get(fp); 761 sid = ntoh24(fh->fh_s_id); 762 763 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); 764 765 disc = &lport->disc; 766 mutex_lock(&disc->disc_mutex); 767 768 if (!lport->point_to_multipoint) { 769 rjt_data.reason = ELS_RJT_UNSUP; 770 rjt_data.explan = ELS_EXPL_NONE; 771 goto reject; 772 } 773 774 flp = fc_frame_payload_get(fp, sizeof(*flp)); 775 if (!flp) { 776 rjt_data.reason = ELS_RJT_LOGIC; 777 rjt_data.explan = ELS_EXPL_INV_LEN; 778 goto reject; 779 } 780 781 rdata = lport->tt.rport_lookup(lport, sid); 782 if (!rdata) { 783 rjt_data.reason = ELS_RJT_FIP; 784 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; 785 goto reject; 786 } 787 mutex_lock(&rdata->rp_mutex); 788 789 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", 790 fc_rport_state(rdata)); 791 792 switch (rdata->rp_state) { 793 case RPORT_ST_INIT: 794 case RPORT_ST_LOGO: 795 case RPORT_ST_DELETE: 796 mutex_unlock(&rdata->rp_mutex); 797 rjt_data.reason = ELS_RJT_FIP; 798 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; 799 goto reject; 800 case RPORT_ST_FLOGI: 801 case RPORT_ST_PLOGI_WAIT: 802 case RPORT_ST_PLOGI: 803 break; 804 case RPORT_ST_PRLI: 805 case RPORT_ST_RTV: 806 case RPORT_ST_READY: 807 case RPORT_ST_ADISC: 808 /* 809 * Set the remote port to be deleted and to then restart. 810 * This queues work to be sure exchanges are reset. 811 */ 812 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 813 mutex_unlock(&rdata->rp_mutex); 814 rjt_data.reason = ELS_RJT_BUSY; 815 rjt_data.explan = ELS_EXPL_NONE; 816 goto reject; 817 } 818 if (fc_rport_login_complete(rdata, fp)) { 819 mutex_unlock(&rdata->rp_mutex); 820 rjt_data.reason = ELS_RJT_LOGIC; 821 rjt_data.explan = ELS_EXPL_NONE; 822 goto reject; 823 } 824 fc_frame_free(rx_fp); 825 826 fp = fc_frame_alloc(lport, sizeof(*flp)); 827 if (!fp) 828 goto out; 829 830 sp = lport->tt.seq_start_next(sp); 831 fc_flogi_fill(lport, fp); 832 flp = fc_frame_payload_get(fp, sizeof(*flp)); 833 flp->fl_cmd = ELS_LS_ACC; 834 835 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 836 ep = fc_seq_exch(sp); 837 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 838 FC_TYPE_ELS, f_ctl, 0); 839 lport->tt.seq_send(lport, sp, fp); 840 841 if (rdata->ids.port_name < lport->wwpn) 842 fc_rport_enter_plogi(rdata); 843 else 844 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); 845 out: 846 mutex_unlock(&rdata->rp_mutex); 847 mutex_unlock(&disc->disc_mutex); 848 return; 849 850 reject: 851 mutex_unlock(&disc->disc_mutex); 852 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 853 fc_frame_free(fp); 854 } 855 856 /** 857 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses 858 * @sp: The sequence the PLOGI is on 859 * @fp: The PLOGI response frame 860 * @rdata_arg: The remote port that sent the PLOGI response 861 * 862 * Locking Note: This function will be called without the rport lock 863 * held, but it will lock, call an _enter_* function or fc_rport_error 864 * and then unlock the rport. 865 */ 866 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, 867 void *rdata_arg) 868 { 869 struct fc_rport_priv *rdata = rdata_arg; 870 struct fc_lport *lport = rdata->local_port; 871 struct fc_els_flogi *plp = NULL; 872 u16 csp_seq; 873 u16 cssp_seq; 874 u8 op; 875 876 mutex_lock(&rdata->rp_mutex); 877 878 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); 879 880 if (rdata->rp_state != RPORT_ST_PLOGI) { 881 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " 882 "%s\n", fc_rport_state(rdata)); 883 if (IS_ERR(fp)) 884 goto err; 885 goto out; 886 } 887 888 if (IS_ERR(fp)) { 889 fc_rport_error_retry(rdata, fp); 890 goto err; 891 } 892 893 op = fc_frame_payload_op(fp); 894 if (op == ELS_LS_ACC && 895 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { 896 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); 897 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); 898 899 if (lport->point_to_multipoint) 900 fc_rport_login_complete(rdata, fp); 901 csp_seq = ntohs(plp->fl_csp.sp_tot_seq); 902 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); 903 if (cssp_seq < csp_seq) 904 csp_seq = cssp_seq; 905 rdata->max_seq = csp_seq; 906 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); 907 fc_rport_enter_prli(rdata); 908 } else 909 fc_rport_error_retry(rdata, fp); 910 911 out: 912 fc_frame_free(fp); 913 err: 914 mutex_unlock(&rdata->rp_mutex); 915 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 916 } 917 918 /** 919 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request 920 * @rdata: The remote port to send a PLOGI to 921 * 922 * Locking Note: The rport lock is expected to be held before calling 923 * this routine. 924 */ 925 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) 926 { 927 struct fc_lport *lport = rdata->local_port; 928 struct fc_frame *fp; 929 930 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", 931 fc_rport_state(rdata)); 932 933 fc_rport_state_enter(rdata, RPORT_ST_PLOGI); 934 935 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 936 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 937 if (!fp) { 938 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__); 939 fc_rport_error_retry(rdata, fp); 940 return; 941 } 942 rdata->e_d_tov = lport->e_d_tov; 943 944 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, 945 fc_rport_plogi_resp, rdata, 946 2 * lport->r_a_tov)) 947 fc_rport_error_retry(rdata, NULL); 948 else 949 kref_get(&rdata->kref); 950 } 951 952 /** 953 * fc_rport_prli_resp() - Process Login (PRLI) response handler 954 * @sp: The sequence the PRLI response was on 955 * @fp: The PRLI response frame 956 * @rdata_arg: The remote port that sent the PRLI response 957 * 958 * Locking Note: This function will be called without the rport lock 959 * held, but it will lock, call an _enter_* function or fc_rport_error 960 * and then unlock the rport. 961 */ 962 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, 963 void *rdata_arg) 964 { 965 struct fc_rport_priv *rdata = rdata_arg; 966 struct { 967 struct fc_els_prli prli; 968 struct fc_els_spp spp; 969 } *pp; 970 u32 roles = FC_RPORT_ROLE_UNKNOWN; 971 u32 fcp_parm = 0; 972 u8 op; 973 u8 resp_code = 0; 974 975 mutex_lock(&rdata->rp_mutex); 976 977 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); 978 979 if (rdata->rp_state != RPORT_ST_PRLI) { 980 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " 981 "%s\n", fc_rport_state(rdata)); 982 if (IS_ERR(fp)) 983 goto err; 984 goto out; 985 } 986 987 if (IS_ERR(fp)) { 988 fc_rport_error_retry(rdata, fp); 989 goto err; 990 } 991 992 /* reinitialize remote port roles */ 993 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 994 995 op = fc_frame_payload_op(fp); 996 if (op == ELS_LS_ACC) { 997 pp = fc_frame_payload_get(fp, sizeof(*pp)); 998 if (!pp) 999 goto out; 1000 1001 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); 1002 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n", 1003 pp->spp.spp_flags); 1004 if (resp_code != FC_SPP_RESP_ACK) { 1005 if (resp_code == FC_SPP_RESP_CONF) 1006 fc_rport_error(rdata, fp); 1007 else 1008 fc_rport_error_retry(rdata, fp); 1009 goto out; 1010 } 1011 if (pp->prli.prli_spp_len < sizeof(pp->spp)) 1012 goto out; 1013 1014 fcp_parm = ntohl(pp->spp.spp_params); 1015 if (fcp_parm & FCP_SPPF_RETRY) 1016 rdata->flags |= FC_RP_FLAGS_RETRY; 1017 1018 rdata->supported_classes = FC_COS_CLASS3; 1019 if (fcp_parm & FCP_SPPF_INIT_FCN) 1020 roles |= FC_RPORT_ROLE_FCP_INITIATOR; 1021 if (fcp_parm & FCP_SPPF_TARG_FCN) 1022 roles |= FC_RPORT_ROLE_FCP_TARGET; 1023 1024 rdata->ids.roles = roles; 1025 fc_rport_enter_rtv(rdata); 1026 1027 } else { 1028 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); 1029 fc_rport_error_retry(rdata, fp); 1030 } 1031 1032 out: 1033 fc_frame_free(fp); 1034 err: 1035 mutex_unlock(&rdata->rp_mutex); 1036 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 1037 } 1038 1039 /** 1040 * fc_rport_logo_resp() - Handler for logout (LOGO) responses 1041 * @sp: The sequence the LOGO was on 1042 * @fp: The LOGO response frame 1043 * @rdata_arg: The remote port that sent the LOGO response 1044 * 1045 * Locking Note: This function will be called without the rport lock 1046 * held, but it will lock, call an _enter_* function or fc_rport_error 1047 * and then unlock the rport. 1048 */ 1049 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1050 void *rdata_arg) 1051 { 1052 struct fc_rport_priv *rdata = rdata_arg; 1053 u8 op; 1054 1055 mutex_lock(&rdata->rp_mutex); 1056 1057 FC_RPORT_DBG(rdata, "Received a LOGO %s\n", fc_els_resp_type(fp)); 1058 1059 if (rdata->rp_state != RPORT_ST_LOGO) { 1060 FC_RPORT_DBG(rdata, "Received a LOGO response, but in state " 1061 "%s\n", fc_rport_state(rdata)); 1062 if (IS_ERR(fp)) 1063 goto err; 1064 goto out; 1065 } 1066 1067 if (IS_ERR(fp)) { 1068 fc_rport_error_retry(rdata, fp); 1069 goto err; 1070 } 1071 1072 op = fc_frame_payload_op(fp); 1073 if (op != ELS_LS_ACC) 1074 FC_RPORT_DBG(rdata, "Bad ELS response op %x for LOGO command\n", 1075 op); 1076 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 1077 1078 out: 1079 fc_frame_free(fp); 1080 err: 1081 mutex_unlock(&rdata->rp_mutex); 1082 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 1083 } 1084 1085 /** 1086 * fc_rport_enter_prli() - Send Process Login (PRLI) request 1087 * @rdata: The remote port to send the PRLI request to 1088 * 1089 * Locking Note: The rport lock is expected to be held before calling 1090 * this routine. 1091 */ 1092 static void fc_rport_enter_prli(struct fc_rport_priv *rdata) 1093 { 1094 struct fc_lport *lport = rdata->local_port; 1095 struct { 1096 struct fc_els_prli prli; 1097 struct fc_els_spp spp; 1098 } *pp; 1099 struct fc_frame *fp; 1100 1101 /* 1102 * If the rport is one of the well known addresses 1103 * we skip PRLI and RTV and go straight to READY. 1104 */ 1105 if (rdata->ids.port_id >= FC_FID_DOM_MGR) { 1106 fc_rport_enter_ready(rdata); 1107 return; 1108 } 1109 1110 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", 1111 fc_rport_state(rdata)); 1112 1113 fc_rport_state_enter(rdata, RPORT_ST_PRLI); 1114 1115 fp = fc_frame_alloc(lport, sizeof(*pp)); 1116 if (!fp) { 1117 fc_rport_error_retry(rdata, fp); 1118 return; 1119 } 1120 1121 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI, 1122 fc_rport_prli_resp, rdata, 1123 2 * lport->r_a_tov)) 1124 fc_rport_error_retry(rdata, NULL); 1125 else 1126 kref_get(&rdata->kref); 1127 } 1128 1129 /** 1130 * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses 1131 * @sp: The sequence the RTV was on 1132 * @fp: The RTV response frame 1133 * @rdata_arg: The remote port that sent the RTV response 1134 * 1135 * Many targets don't seem to support this. 1136 * 1137 * Locking Note: This function will be called without the rport lock 1138 * held, but it will lock, call an _enter_* function or fc_rport_error 1139 * and then unlock the rport. 1140 */ 1141 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, 1142 void *rdata_arg) 1143 { 1144 struct fc_rport_priv *rdata = rdata_arg; 1145 u8 op; 1146 1147 mutex_lock(&rdata->rp_mutex); 1148 1149 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); 1150 1151 if (rdata->rp_state != RPORT_ST_RTV) { 1152 FC_RPORT_DBG(rdata, "Received a RTV response, but in state " 1153 "%s\n", fc_rport_state(rdata)); 1154 if (IS_ERR(fp)) 1155 goto err; 1156 goto out; 1157 } 1158 1159 if (IS_ERR(fp)) { 1160 fc_rport_error(rdata, fp); 1161 goto err; 1162 } 1163 1164 op = fc_frame_payload_op(fp); 1165 if (op == ELS_LS_ACC) { 1166 struct fc_els_rtv_acc *rtv; 1167 u32 toq; 1168 u32 tov; 1169 1170 rtv = fc_frame_payload_get(fp, sizeof(*rtv)); 1171 if (rtv) { 1172 toq = ntohl(rtv->rtv_toq); 1173 tov = ntohl(rtv->rtv_r_a_tov); 1174 if (tov == 0) 1175 tov = 1; 1176 rdata->r_a_tov = tov; 1177 tov = ntohl(rtv->rtv_e_d_tov); 1178 if (toq & FC_ELS_RTV_EDRES) 1179 tov /= 1000000; 1180 if (tov == 0) 1181 tov = 1; 1182 rdata->e_d_tov = tov; 1183 } 1184 } 1185 1186 fc_rport_enter_ready(rdata); 1187 1188 out: 1189 fc_frame_free(fp); 1190 err: 1191 mutex_unlock(&rdata->rp_mutex); 1192 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 1193 } 1194 1195 /** 1196 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request 1197 * @rdata: The remote port to send the RTV request to 1198 * 1199 * Locking Note: The rport lock is expected to be held before calling 1200 * this routine. 1201 */ 1202 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) 1203 { 1204 struct fc_frame *fp; 1205 struct fc_lport *lport = rdata->local_port; 1206 1207 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", 1208 fc_rport_state(rdata)); 1209 1210 fc_rport_state_enter(rdata, RPORT_ST_RTV); 1211 1212 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); 1213 if (!fp) { 1214 fc_rport_error_retry(rdata, fp); 1215 return; 1216 } 1217 1218 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, 1219 fc_rport_rtv_resp, rdata, 1220 2 * lport->r_a_tov)) 1221 fc_rport_error_retry(rdata, NULL); 1222 else 1223 kref_get(&rdata->kref); 1224 } 1225 1226 /** 1227 * fc_rport_enter_logo() - Send a logout (LOGO) request 1228 * @rdata: The remote port to send the LOGO request to 1229 * 1230 * Locking Note: The rport lock is expected to be held before calling 1231 * this routine. 1232 */ 1233 static void fc_rport_enter_logo(struct fc_rport_priv *rdata) 1234 { 1235 struct fc_lport *lport = rdata->local_port; 1236 struct fc_frame *fp; 1237 1238 FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n", 1239 fc_rport_state(rdata)); 1240 1241 fc_rport_state_enter(rdata, RPORT_ST_LOGO); 1242 1243 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); 1244 if (!fp) { 1245 fc_rport_error_retry(rdata, fp); 1246 return; 1247 } 1248 1249 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, 1250 fc_rport_logo_resp, rdata, 1251 2 * lport->r_a_tov)) 1252 fc_rport_error_retry(rdata, NULL); 1253 else 1254 kref_get(&rdata->kref); 1255 } 1256 1257 /** 1258 * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses 1259 * @sp: The sequence the ADISC response was on 1260 * @fp: The ADISC response frame 1261 * @rdata_arg: The remote port that sent the ADISC response 1262 * 1263 * Locking Note: This function will be called without the rport lock 1264 * held, but it will lock, call an _enter_* function or fc_rport_error 1265 * and then unlock the rport. 1266 */ 1267 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, 1268 void *rdata_arg) 1269 { 1270 struct fc_rport_priv *rdata = rdata_arg; 1271 struct fc_els_adisc *adisc; 1272 u8 op; 1273 1274 mutex_lock(&rdata->rp_mutex); 1275 1276 FC_RPORT_DBG(rdata, "Received a ADISC response\n"); 1277 1278 if (rdata->rp_state != RPORT_ST_ADISC) { 1279 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", 1280 fc_rport_state(rdata)); 1281 if (IS_ERR(fp)) 1282 goto err; 1283 goto out; 1284 } 1285 1286 if (IS_ERR(fp)) { 1287 fc_rport_error(rdata, fp); 1288 goto err; 1289 } 1290 1291 /* 1292 * If address verification failed. Consider us logged out of the rport. 1293 * Since the rport is still in discovery, we want to be 1294 * logged in, so go to PLOGI state. Otherwise, go back to READY. 1295 */ 1296 op = fc_frame_payload_op(fp); 1297 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1298 if (op != ELS_LS_ACC || !adisc || 1299 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || 1300 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || 1301 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { 1302 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); 1303 fc_rport_enter_flogi(rdata); 1304 } else { 1305 FC_RPORT_DBG(rdata, "ADISC OK\n"); 1306 fc_rport_enter_ready(rdata); 1307 } 1308 out: 1309 fc_frame_free(fp); 1310 err: 1311 mutex_unlock(&rdata->rp_mutex); 1312 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 1313 } 1314 1315 /** 1316 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request 1317 * @rdata: The remote port to send the ADISC request to 1318 * 1319 * Locking Note: The rport lock is expected to be held before calling 1320 * this routine. 1321 */ 1322 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) 1323 { 1324 struct fc_lport *lport = rdata->local_port; 1325 struct fc_frame *fp; 1326 1327 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", 1328 fc_rport_state(rdata)); 1329 1330 fc_rport_state_enter(rdata, RPORT_ST_ADISC); 1331 1332 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); 1333 if (!fp) { 1334 fc_rport_error_retry(rdata, fp); 1335 return; 1336 } 1337 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, 1338 fc_rport_adisc_resp, rdata, 1339 2 * lport->r_a_tov)) 1340 fc_rport_error_retry(rdata, NULL); 1341 else 1342 kref_get(&rdata->kref); 1343 } 1344 1345 /** 1346 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests 1347 * @rdata: The remote port that sent the ADISC request 1348 * @sp: The sequence the ADISC request was on 1349 * @in_fp: The ADISC request frame 1350 * 1351 * Locking Note: Called with the lport and rport locks held. 1352 */ 1353 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, 1354 struct fc_seq *sp, struct fc_frame *in_fp) 1355 { 1356 struct fc_lport *lport = rdata->local_port; 1357 struct fc_frame *fp; 1358 struct fc_exch *ep = fc_seq_exch(sp); 1359 struct fc_els_adisc *adisc; 1360 struct fc_seq_els_data rjt_data; 1361 u32 f_ctl; 1362 1363 FC_RPORT_DBG(rdata, "Received ADISC request\n"); 1364 1365 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); 1366 if (!adisc) { 1367 rjt_data.fp = NULL; 1368 rjt_data.reason = ELS_RJT_PROT; 1369 rjt_data.explan = ELS_EXPL_INV_LEN; 1370 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1371 goto drop; 1372 } 1373 1374 fp = fc_frame_alloc(lport, sizeof(*adisc)); 1375 if (!fp) 1376 goto drop; 1377 fc_adisc_fill(lport, fp); 1378 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1379 adisc->adisc_cmd = ELS_LS_ACC; 1380 sp = lport->tt.seq_start_next(sp); 1381 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1382 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1383 FC_TYPE_ELS, f_ctl, 0); 1384 lport->tt.seq_send(lport, sp, fp); 1385 drop: 1386 fc_frame_free(in_fp); 1387 } 1388 1389 /** 1390 * fc_rport_recv_rls_req() - Handle received Read Link Status request 1391 * @rdata: The remote port that sent the RLS request 1392 * @sp: The sequence that the RLS was on 1393 * @rx_fp: The PRLI request frame 1394 * 1395 * Locking Note: The rport lock is expected to be held before calling 1396 * this function. 1397 */ 1398 static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, 1399 struct fc_seq *sp, struct fc_frame *rx_fp) 1400 1401 { 1402 struct fc_lport *lport = rdata->local_port; 1403 struct fc_frame *fp; 1404 struct fc_exch *ep = fc_seq_exch(sp); 1405 struct fc_els_rls *rls; 1406 struct fc_els_rls_resp *rsp; 1407 struct fc_els_lesb *lesb; 1408 struct fc_seq_els_data rjt_data; 1409 struct fc_host_statistics *hst; 1410 u32 f_ctl; 1411 1412 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", 1413 fc_rport_state(rdata)); 1414 1415 rls = fc_frame_payload_get(rx_fp, sizeof(*rls)); 1416 if (!rls) { 1417 rjt_data.reason = ELS_RJT_PROT; 1418 rjt_data.explan = ELS_EXPL_INV_LEN; 1419 goto out_rjt; 1420 } 1421 1422 fp = fc_frame_alloc(lport, sizeof(*rsp)); 1423 if (!fp) { 1424 rjt_data.reason = ELS_RJT_UNAB; 1425 rjt_data.explan = ELS_EXPL_INSUF_RES; 1426 goto out_rjt; 1427 } 1428 1429 rsp = fc_frame_payload_get(fp, sizeof(*rsp)); 1430 memset(rsp, 0, sizeof(*rsp)); 1431 rsp->rls_cmd = ELS_LS_ACC; 1432 lesb = &rsp->rls_lesb; 1433 if (lport->tt.get_lesb) { 1434 /* get LESB from LLD if it supports it */ 1435 lport->tt.get_lesb(lport, lesb); 1436 } else { 1437 fc_get_host_stats(lport->host); 1438 hst = &lport->host_stats; 1439 lesb->lesb_link_fail = htonl(hst->link_failure_count); 1440 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count); 1441 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count); 1442 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count); 1443 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count); 1444 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count); 1445 } 1446 1447 sp = lport->tt.seq_start_next(sp); 1448 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; 1449 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1450 FC_TYPE_ELS, f_ctl, 0); 1451 lport->tt.seq_send(lport, sp, fp); 1452 goto out; 1453 1454 out_rjt: 1455 rjt_data.fp = NULL; 1456 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1457 out: 1458 fc_frame_free(rx_fp); 1459 } 1460 1461 /** 1462 * fc_rport_recv_els_req() - Handler for validated ELS requests 1463 * @lport: The local port that received the ELS request 1464 * @sp: The sequence that the ELS request was on 1465 * @fp: The ELS request frame 1466 * 1467 * Handle incoming ELS requests that require port login. 1468 * The ELS opcode has already been validated by the caller. 1469 * 1470 * Locking Note: Called with the lport lock held. 1471 */ 1472 static void fc_rport_recv_els_req(struct fc_lport *lport, 1473 struct fc_seq *sp, struct fc_frame *fp) 1474 { 1475 struct fc_rport_priv *rdata; 1476 struct fc_frame_header *fh; 1477 struct fc_seq_els_data els_data; 1478 1479 els_data.fp = NULL; 1480 els_data.reason = ELS_RJT_UNAB; 1481 els_data.explan = ELS_EXPL_PLOGI_REQD; 1482 1483 fh = fc_frame_header_get(fp); 1484 1485 mutex_lock(&lport->disc.disc_mutex); 1486 rdata = lport->tt.rport_lookup(lport, ntoh24(fh->fh_s_id)); 1487 if (!rdata) { 1488 mutex_unlock(&lport->disc.disc_mutex); 1489 goto reject; 1490 } 1491 mutex_lock(&rdata->rp_mutex); 1492 mutex_unlock(&lport->disc.disc_mutex); 1493 1494 switch (rdata->rp_state) { 1495 case RPORT_ST_PRLI: 1496 case RPORT_ST_RTV: 1497 case RPORT_ST_READY: 1498 case RPORT_ST_ADISC: 1499 break; 1500 default: 1501 mutex_unlock(&rdata->rp_mutex); 1502 goto reject; 1503 } 1504 1505 switch (fc_frame_payload_op(fp)) { 1506 case ELS_PRLI: 1507 fc_rport_recv_prli_req(rdata, sp, fp); 1508 break; 1509 case ELS_PRLO: 1510 fc_rport_recv_prlo_req(rdata, sp, fp); 1511 break; 1512 case ELS_ADISC: 1513 fc_rport_recv_adisc_req(rdata, sp, fp); 1514 break; 1515 case ELS_RRQ: 1516 els_data.fp = fp; 1517 lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data); 1518 break; 1519 case ELS_REC: 1520 els_data.fp = fp; 1521 lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data); 1522 break; 1523 case ELS_RLS: 1524 fc_rport_recv_rls_req(rdata, sp, fp); 1525 break; 1526 default: 1527 fc_frame_free(fp); /* can't happen */ 1528 break; 1529 } 1530 1531 mutex_unlock(&rdata->rp_mutex); 1532 return; 1533 1534 reject: 1535 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); 1536 fc_frame_free(fp); 1537 } 1538 1539 /** 1540 * fc_rport_recv_req() - Handler for requests 1541 * @sp: The sequence the request was on 1542 * @fp: The request frame 1543 * @lport: The local port that received the request 1544 * 1545 * Locking Note: Called with the lport lock held. 1546 */ 1547 void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp, 1548 struct fc_lport *lport) 1549 { 1550 struct fc_seq_els_data els_data; 1551 1552 /* 1553 * Handle FLOGI, PLOGI and LOGO requests separately, since they 1554 * don't require prior login. 1555 * Check for unsupported opcodes first and reject them. 1556 * For some ops, it would be incorrect to reject with "PLOGI required". 1557 */ 1558 switch (fc_frame_payload_op(fp)) { 1559 case ELS_FLOGI: 1560 fc_rport_recv_flogi_req(lport, sp, fp); 1561 break; 1562 case ELS_PLOGI: 1563 fc_rport_recv_plogi_req(lport, sp, fp); 1564 break; 1565 case ELS_LOGO: 1566 fc_rport_recv_logo_req(lport, sp, fp); 1567 break; 1568 case ELS_PRLI: 1569 case ELS_PRLO: 1570 case ELS_ADISC: 1571 case ELS_RRQ: 1572 case ELS_REC: 1573 case ELS_RLS: 1574 fc_rport_recv_els_req(lport, sp, fp); 1575 break; 1576 default: 1577 fc_frame_free(fp); 1578 els_data.fp = NULL; 1579 els_data.reason = ELS_RJT_UNSUP; 1580 els_data.explan = ELS_EXPL_NONE; 1581 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); 1582 break; 1583 } 1584 } 1585 1586 /** 1587 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests 1588 * @lport: The local port that received the PLOGI request 1589 * @sp: The sequence that the PLOGI request was on 1590 * @rx_fp: The PLOGI request frame 1591 * 1592 * Locking Note: The rport lock is held before calling this function. 1593 */ 1594 static void fc_rport_recv_plogi_req(struct fc_lport *lport, 1595 struct fc_seq *sp, struct fc_frame *rx_fp) 1596 { 1597 struct fc_disc *disc; 1598 struct fc_rport_priv *rdata; 1599 struct fc_frame *fp = rx_fp; 1600 struct fc_exch *ep; 1601 struct fc_frame_header *fh; 1602 struct fc_els_flogi *pl; 1603 struct fc_seq_els_data rjt_data; 1604 u32 sid, f_ctl; 1605 1606 rjt_data.fp = NULL; 1607 fh = fc_frame_header_get(fp); 1608 sid = ntoh24(fh->fh_s_id); 1609 1610 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); 1611 1612 pl = fc_frame_payload_get(fp, sizeof(*pl)); 1613 if (!pl) { 1614 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); 1615 rjt_data.reason = ELS_RJT_PROT; 1616 rjt_data.explan = ELS_EXPL_INV_LEN; 1617 goto reject; 1618 } 1619 1620 disc = &lport->disc; 1621 mutex_lock(&disc->disc_mutex); 1622 rdata = lport->tt.rport_create(lport, sid); 1623 if (!rdata) { 1624 mutex_unlock(&disc->disc_mutex); 1625 rjt_data.reason = ELS_RJT_UNAB; 1626 rjt_data.explan = ELS_EXPL_INSUF_RES; 1627 goto reject; 1628 } 1629 1630 mutex_lock(&rdata->rp_mutex); 1631 mutex_unlock(&disc->disc_mutex); 1632 1633 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); 1634 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); 1635 1636 /* 1637 * If the rport was just created, possibly due to the incoming PLOGI, 1638 * set the state appropriately and accept the PLOGI. 1639 * 1640 * If we had also sent a PLOGI, and if the received PLOGI is from a 1641 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason 1642 * "command already in progress". 1643 * 1644 * XXX TBD: If the session was ready before, the PLOGI should result in 1645 * all outstanding exchanges being reset. 1646 */ 1647 switch (rdata->rp_state) { 1648 case RPORT_ST_INIT: 1649 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); 1650 break; 1651 case RPORT_ST_PLOGI_WAIT: 1652 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n"); 1653 break; 1654 case RPORT_ST_PLOGI: 1655 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); 1656 if (rdata->ids.port_name < lport->wwpn) { 1657 mutex_unlock(&rdata->rp_mutex); 1658 rjt_data.reason = ELS_RJT_INPROG; 1659 rjt_data.explan = ELS_EXPL_NONE; 1660 goto reject; 1661 } 1662 break; 1663 case RPORT_ST_PRLI: 1664 case RPORT_ST_RTV: 1665 case RPORT_ST_READY: 1666 case RPORT_ST_ADISC: 1667 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " 1668 "- ignored for now\n", rdata->rp_state); 1669 /* XXX TBD - should reset */ 1670 break; 1671 case RPORT_ST_FLOGI: 1672 case RPORT_ST_DELETE: 1673 case RPORT_ST_LOGO: 1674 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", 1675 fc_rport_state(rdata)); 1676 mutex_unlock(&rdata->rp_mutex); 1677 rjt_data.reason = ELS_RJT_BUSY; 1678 rjt_data.explan = ELS_EXPL_NONE; 1679 goto reject; 1680 } 1681 1682 /* 1683 * Get session payload size from incoming PLOGI. 1684 */ 1685 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); 1686 fc_frame_free(rx_fp); 1687 1688 /* 1689 * Send LS_ACC. If this fails, the originator should retry. 1690 */ 1691 sp = lport->tt.seq_start_next(sp); 1692 if (!sp) 1693 goto out; 1694 fp = fc_frame_alloc(lport, sizeof(*pl)); 1695 if (!fp) 1696 goto out; 1697 1698 fc_plogi_fill(lport, fp, ELS_LS_ACC); 1699 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1700 ep = fc_seq_exch(sp); 1701 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1702 FC_TYPE_ELS, f_ctl, 0); 1703 lport->tt.seq_send(lport, sp, fp); 1704 fc_rport_enter_prli(rdata); 1705 out: 1706 mutex_unlock(&rdata->rp_mutex); 1707 return; 1708 1709 reject: 1710 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1711 fc_frame_free(fp); 1712 } 1713 1714 /** 1715 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests 1716 * @rdata: The remote port that sent the PRLI request 1717 * @sp: The sequence that the PRLI was on 1718 * @rx_fp: The PRLI request frame 1719 * 1720 * Locking Note: The rport lock is exected to be held before calling 1721 * this function. 1722 */ 1723 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, 1724 struct fc_seq *sp, struct fc_frame *rx_fp) 1725 { 1726 struct fc_lport *lport = rdata->local_port; 1727 struct fc_exch *ep; 1728 struct fc_frame *fp; 1729 struct fc_frame_header *fh; 1730 struct { 1731 struct fc_els_prli prli; 1732 struct fc_els_spp spp; 1733 } *pp; 1734 struct fc_els_spp *rspp; /* request service param page */ 1735 struct fc_els_spp *spp; /* response spp */ 1736 unsigned int len; 1737 unsigned int plen; 1738 enum fc_els_spp_resp resp; 1739 struct fc_seq_els_data rjt_data; 1740 u32 f_ctl; 1741 u32 fcp_parm; 1742 u32 roles = FC_RPORT_ROLE_UNKNOWN; 1743 1744 rjt_data.fp = NULL; 1745 fh = fc_frame_header_get(rx_fp); 1746 1747 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", 1748 fc_rport_state(rdata)); 1749 1750 len = fr_len(rx_fp) - sizeof(*fh); 1751 pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); 1752 if (!pp) 1753 goto reject_len; 1754 plen = ntohs(pp->prli.prli_len); 1755 if ((plen % 4) != 0 || plen > len || plen < 16) 1756 goto reject_len; 1757 if (plen < len) 1758 len = plen; 1759 plen = pp->prli.prli_spp_len; 1760 if ((plen % 4) != 0 || plen < sizeof(*spp) || 1761 plen > len || len < sizeof(*pp) || plen < 12) 1762 goto reject_len; 1763 rspp = &pp->spp; 1764 1765 fp = fc_frame_alloc(lport, len); 1766 if (!fp) { 1767 rjt_data.reason = ELS_RJT_UNAB; 1768 rjt_data.explan = ELS_EXPL_INSUF_RES; 1769 goto reject; 1770 } 1771 sp = lport->tt.seq_start_next(sp); 1772 WARN_ON(!sp); 1773 pp = fc_frame_payload_get(fp, len); 1774 WARN_ON(!pp); 1775 memset(pp, 0, len); 1776 pp->prli.prli_cmd = ELS_LS_ACC; 1777 pp->prli.prli_spp_len = plen; 1778 pp->prli.prli_len = htons(len); 1779 len -= sizeof(struct fc_els_prli); 1780 1781 /* reinitialize remote port roles */ 1782 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 1783 1784 /* 1785 * Go through all the service parameter pages and build 1786 * response. If plen indicates longer SPP than standard, 1787 * use that. The entire response has been pre-cleared above. 1788 */ 1789 spp = &pp->spp; 1790 while (len >= plen) { 1791 spp->spp_type = rspp->spp_type; 1792 spp->spp_type_ext = rspp->spp_type_ext; 1793 spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR; 1794 resp = FC_SPP_RESP_ACK; 1795 1796 switch (rspp->spp_type) { 1797 case 0: /* common to all FC-4 types */ 1798 break; 1799 case FC_TYPE_FCP: 1800 fcp_parm = ntohl(rspp->spp_params); 1801 if (fcp_parm & FCP_SPPF_RETRY) 1802 rdata->flags |= FC_RP_FLAGS_RETRY; 1803 rdata->supported_classes = FC_COS_CLASS3; 1804 if (fcp_parm & FCP_SPPF_INIT_FCN) 1805 roles |= FC_RPORT_ROLE_FCP_INITIATOR; 1806 if (fcp_parm & FCP_SPPF_TARG_FCN) 1807 roles |= FC_RPORT_ROLE_FCP_TARGET; 1808 rdata->ids.roles = roles; 1809 1810 spp->spp_params = htonl(lport->service_params); 1811 break; 1812 default: 1813 resp = FC_SPP_RESP_INVL; 1814 break; 1815 } 1816 spp->spp_flags |= resp; 1817 len -= plen; 1818 rspp = (struct fc_els_spp *)((char *)rspp + plen); 1819 spp = (struct fc_els_spp *)((char *)spp + plen); 1820 } 1821 1822 /* 1823 * Send LS_ACC. If this fails, the originator should retry. 1824 */ 1825 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; 1826 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1827 ep = fc_seq_exch(sp); 1828 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1829 FC_TYPE_ELS, f_ctl, 0); 1830 lport->tt.seq_send(lport, sp, fp); 1831 1832 switch (rdata->rp_state) { 1833 case RPORT_ST_PRLI: 1834 fc_rport_enter_ready(rdata); 1835 break; 1836 default: 1837 break; 1838 } 1839 goto drop; 1840 1841 reject_len: 1842 rjt_data.reason = ELS_RJT_PROT; 1843 rjt_data.explan = ELS_EXPL_INV_LEN; 1844 reject: 1845 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1846 drop: 1847 fc_frame_free(rx_fp); 1848 } 1849 1850 /** 1851 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests 1852 * @rdata: The remote port that sent the PRLO request 1853 * @sp: The sequence that the PRLO was on 1854 * @rx_fp: The PRLO request frame 1855 * 1856 * Locking Note: The rport lock is exected to be held before calling 1857 * this function. 1858 */ 1859 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, 1860 struct fc_seq *sp, 1861 struct fc_frame *rx_fp) 1862 { 1863 struct fc_lport *lport = rdata->local_port; 1864 struct fc_frame_header *fh; 1865 struct fc_exch *ep; 1866 struct fc_frame *fp; 1867 struct { 1868 struct fc_els_prlo prlo; 1869 struct fc_els_spp spp; 1870 } *pp; 1871 struct fc_els_spp *rspp; /* request service param page */ 1872 struct fc_els_spp *spp; /* response spp */ 1873 unsigned int len; 1874 unsigned int plen; 1875 u32 f_ctl; 1876 struct fc_seq_els_data rjt_data; 1877 1878 rjt_data.fp = NULL; 1879 fh = fc_frame_header_get(rx_fp); 1880 1881 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", 1882 fc_rport_state(rdata)); 1883 1884 len = fr_len(rx_fp) - sizeof(*fh); 1885 pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); 1886 if (!pp) 1887 goto reject_len; 1888 plen = ntohs(pp->prlo.prlo_len); 1889 if (plen != 20) 1890 goto reject_len; 1891 if (plen < len) 1892 len = plen; 1893 1894 rspp = &pp->spp; 1895 1896 fp = fc_frame_alloc(lport, len); 1897 if (!fp) { 1898 rjt_data.reason = ELS_RJT_UNAB; 1899 rjt_data.explan = ELS_EXPL_INSUF_RES; 1900 goto reject; 1901 } 1902 1903 sp = lport->tt.seq_start_next(sp); 1904 WARN_ON(!sp); 1905 pp = fc_frame_payload_get(fp, len); 1906 WARN_ON(!pp); 1907 memset(pp, 0, len); 1908 pp->prlo.prlo_cmd = ELS_LS_ACC; 1909 pp->prlo.prlo_obs = 0x10; 1910 pp->prlo.prlo_len = htons(len); 1911 spp = &pp->spp; 1912 spp->spp_type = rspp->spp_type; 1913 spp->spp_type_ext = rspp->spp_type_ext; 1914 spp->spp_flags = FC_SPP_RESP_ACK; 1915 1916 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 1917 1918 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; 1919 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1920 ep = fc_seq_exch(sp); 1921 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1922 FC_TYPE_ELS, f_ctl, 0); 1923 lport->tt.seq_send(lport, sp, fp); 1924 goto drop; 1925 1926 reject_len: 1927 rjt_data.reason = ELS_RJT_PROT; 1928 rjt_data.explan = ELS_EXPL_INV_LEN; 1929 reject: 1930 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1931 drop: 1932 fc_frame_free(rx_fp); 1933 } 1934 1935 /** 1936 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests 1937 * @lport: The local port that received the LOGO request 1938 * @sp: The sequence that the LOGO request was on 1939 * @fp: The LOGO request frame 1940 * 1941 * Locking Note: The rport lock is exected to be held before calling 1942 * this function. 1943 */ 1944 static void fc_rport_recv_logo_req(struct fc_lport *lport, 1945 struct fc_seq *sp, 1946 struct fc_frame *fp) 1947 { 1948 struct fc_frame_header *fh; 1949 struct fc_rport_priv *rdata; 1950 u32 sid; 1951 1952 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 1953 1954 fh = fc_frame_header_get(fp); 1955 sid = ntoh24(fh->fh_s_id); 1956 1957 mutex_lock(&lport->disc.disc_mutex); 1958 rdata = lport->tt.rport_lookup(lport, sid); 1959 if (rdata) { 1960 mutex_lock(&rdata->rp_mutex); 1961 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", 1962 fc_rport_state(rdata)); 1963 1964 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 1965 mutex_unlock(&rdata->rp_mutex); 1966 } else 1967 FC_RPORT_ID_DBG(lport, sid, 1968 "Received LOGO from non-logged-in port\n"); 1969 mutex_unlock(&lport->disc.disc_mutex); 1970 fc_frame_free(fp); 1971 } 1972 1973 /** 1974 * fc_rport_flush_queue() - Flush the rport_event_queue 1975 */ 1976 static void fc_rport_flush_queue(void) 1977 { 1978 flush_workqueue(rport_event_queue); 1979 } 1980 1981 /** 1982 * fc_rport_init() - Initialize the remote port layer for a local port 1983 * @lport: The local port to initialize the remote port layer for 1984 */ 1985 int fc_rport_init(struct fc_lport *lport) 1986 { 1987 if (!lport->tt.rport_lookup) 1988 lport->tt.rport_lookup = fc_rport_lookup; 1989 1990 if (!lport->tt.rport_create) 1991 lport->tt.rport_create = fc_rport_create; 1992 1993 if (!lport->tt.rport_login) 1994 lport->tt.rport_login = fc_rport_login; 1995 1996 if (!lport->tt.rport_logoff) 1997 lport->tt.rport_logoff = fc_rport_logoff; 1998 1999 if (!lport->tt.rport_recv_req) 2000 lport->tt.rport_recv_req = fc_rport_recv_req; 2001 2002 if (!lport->tt.rport_flush_queue) 2003 lport->tt.rport_flush_queue = fc_rport_flush_queue; 2004 2005 if (!lport->tt.rport_destroy) 2006 lport->tt.rport_destroy = fc_rport_destroy; 2007 2008 return 0; 2009 } 2010 EXPORT_SYMBOL(fc_rport_init); 2011 2012 /** 2013 * fc_setup_rport() - Initialize the rport_event_queue 2014 */ 2015 int fc_setup_rport() 2016 { 2017 rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); 2018 if (!rport_event_queue) 2019 return -ENOMEM; 2020 return 0; 2021 } 2022 2023 /** 2024 * fc_destroy_rport() - Destroy the rport_event_queue 2025 */ 2026 void fc_destroy_rport() 2027 { 2028 destroy_workqueue(rport_event_queue); 2029 } 2030 2031 /** 2032 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port 2033 * @rport: The remote port whose I/O should be terminated 2034 */ 2035 void fc_rport_terminate_io(struct fc_rport *rport) 2036 { 2037 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 2038 struct fc_lport *lport = rpriv->local_port; 2039 2040 lport->tt.exch_mgr_reset(lport, 0, rport->port_id); 2041 lport->tt.exch_mgr_reset(lport, rport->port_id, 0); 2042 } 2043 EXPORT_SYMBOL(fc_rport_terminate_io); 2044