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/rcupdate.h> 51 #include <linux/timer.h> 52 #include <linux/workqueue.h> 53 #include <asm/unaligned.h> 54 55 #include <scsi/libfc.h> 56 #include <scsi/fc_encode.h> 57 58 #include "fc_libfc.h" 59 60 struct workqueue_struct *rport_event_queue; 61 62 static void fc_rport_enter_plogi(struct fc_rport_priv *); 63 static void fc_rport_enter_prli(struct fc_rport_priv *); 64 static void fc_rport_enter_rtv(struct fc_rport_priv *); 65 static void fc_rport_enter_ready(struct fc_rport_priv *); 66 static void fc_rport_enter_logo(struct fc_rport_priv *); 67 static void fc_rport_enter_adisc(struct fc_rport_priv *); 68 69 static void fc_rport_recv_plogi_req(struct fc_lport *, 70 struct fc_seq *, struct fc_frame *); 71 static void fc_rport_recv_prli_req(struct fc_rport_priv *, 72 struct fc_seq *, struct fc_frame *); 73 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, 74 struct fc_seq *, struct fc_frame *); 75 static void fc_rport_recv_logo_req(struct fc_lport *, 76 struct fc_seq *, struct fc_frame *); 77 static void fc_rport_timeout(struct work_struct *); 78 static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); 79 static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); 80 static void fc_rport_work(struct work_struct *); 81 82 static const char *fc_rport_state_names[] = { 83 [RPORT_ST_INIT] = "Init", 84 [RPORT_ST_PLOGI] = "PLOGI", 85 [RPORT_ST_PRLI] = "PRLI", 86 [RPORT_ST_RTV] = "RTV", 87 [RPORT_ST_READY] = "Ready", 88 [RPORT_ST_LOGO] = "LOGO", 89 [RPORT_ST_ADISC] = "ADISC", 90 [RPORT_ST_DELETE] = "Delete", 91 [RPORT_ST_RESTART] = "Restart", 92 }; 93 94 /** 95 * fc_rport_lookup() - Lookup a remote port by port_id 96 * @lport: The local port to lookup the remote port on 97 * @port_id: The remote port ID to look up 98 */ 99 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, 100 u32 port_id) 101 { 102 struct fc_rport_priv *rdata; 103 104 list_for_each_entry(rdata, &lport->disc.rports, peers) 105 if (rdata->ids.port_id == port_id) 106 return rdata; 107 return NULL; 108 } 109 110 /** 111 * fc_rport_create() - Create a new remote port 112 * @lport: The local port this remote port will be associated with 113 * @ids: The identifiers for the new remote port 114 * 115 * The remote port will start in the INIT state. 116 * 117 * Locking note: must be called with the disc_mutex held. 118 */ 119 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, 120 u32 port_id) 121 { 122 struct fc_rport_priv *rdata; 123 124 rdata = lport->tt.rport_lookup(lport, port_id); 125 if (rdata) 126 return rdata; 127 128 rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); 129 if (!rdata) 130 return NULL; 131 132 rdata->ids.node_name = -1; 133 rdata->ids.port_name = -1; 134 rdata->ids.port_id = port_id; 135 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 136 137 kref_init(&rdata->kref); 138 mutex_init(&rdata->rp_mutex); 139 rdata->local_port = lport; 140 rdata->rp_state = RPORT_ST_INIT; 141 rdata->event = RPORT_EV_NONE; 142 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; 143 rdata->e_d_tov = lport->e_d_tov; 144 rdata->r_a_tov = lport->r_a_tov; 145 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 146 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); 147 INIT_WORK(&rdata->event_work, fc_rport_work); 148 if (port_id != FC_FID_DIR_SERV) 149 list_add(&rdata->peers, &lport->disc.rports); 150 return rdata; 151 } 152 153 /** 154 * fc_rport_destroy() - Free a remote port after last reference is released 155 * @kref: The remote port's kref 156 */ 157 static void fc_rport_destroy(struct kref *kref) 158 { 159 struct fc_rport_priv *rdata; 160 161 rdata = container_of(kref, struct fc_rport_priv, kref); 162 kfree(rdata); 163 } 164 165 /** 166 * fc_rport_state() - Return a string identifying the remote port's state 167 * @rdata: The remote port 168 */ 169 static const char *fc_rport_state(struct fc_rport_priv *rdata) 170 { 171 const char *cp; 172 173 cp = fc_rport_state_names[rdata->rp_state]; 174 if (!cp) 175 cp = "Unknown"; 176 return cp; 177 } 178 179 /** 180 * fc_set_rport_loss_tmo() - Set the remote port loss timeout 181 * @rport: The remote port that gets a new timeout value 182 * @timeout: The new timeout value (in seconds) 183 */ 184 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) 185 { 186 if (timeout) 187 rport->dev_loss_tmo = timeout + 5; 188 else 189 rport->dev_loss_tmo = 30; 190 } 191 EXPORT_SYMBOL(fc_set_rport_loss_tmo); 192 193 /** 194 * fc_plogi_get_maxframe() - Get the maximum payload from the common service 195 * parameters in a FLOGI frame 196 * @flp: The FLOGI payload 197 * @maxval: The maximum frame size upper limit; this may be less than what 198 * is in the service parameters 199 */ 200 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, 201 unsigned int maxval) 202 { 203 unsigned int mfs; 204 205 /* 206 * Get max payload from the common service parameters and the 207 * class 3 receive data field size. 208 */ 209 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; 210 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 211 maxval = mfs; 212 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); 213 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 214 maxval = mfs; 215 return maxval; 216 } 217 218 /** 219 * fc_rport_state_enter() - Change the state of a remote port 220 * @rdata: The remote port whose state should change 221 * @new: The new state 222 * 223 * Locking Note: Called with the rport lock held 224 */ 225 static void fc_rport_state_enter(struct fc_rport_priv *rdata, 226 enum fc_rport_state new) 227 { 228 if (rdata->rp_state != new) 229 rdata->retries = 0; 230 rdata->rp_state = new; 231 } 232 233 /** 234 * fc_rport_work() - Handler for remote port events in the rport_event_queue 235 * @work: Handle to the remote port being dequeued 236 */ 237 static void fc_rport_work(struct work_struct *work) 238 { 239 u32 port_id; 240 struct fc_rport_priv *rdata = 241 container_of(work, struct fc_rport_priv, event_work); 242 struct fc_rport_libfc_priv *rpriv; 243 enum fc_rport_event event; 244 struct fc_lport *lport = rdata->local_port; 245 struct fc_rport_operations *rport_ops; 246 struct fc_rport_identifiers ids; 247 struct fc_rport *rport; 248 int restart = 0; 249 250 mutex_lock(&rdata->rp_mutex); 251 event = rdata->event; 252 rport_ops = rdata->ops; 253 rport = rdata->rport; 254 255 FC_RPORT_DBG(rdata, "work event %u\n", event); 256 257 switch (event) { 258 case RPORT_EV_READY: 259 ids = rdata->ids; 260 rdata->event = RPORT_EV_NONE; 261 kref_get(&rdata->kref); 262 mutex_unlock(&rdata->rp_mutex); 263 264 if (!rport) 265 rport = fc_remote_port_add(lport->host, 0, &ids); 266 if (!rport) { 267 FC_RPORT_DBG(rdata, "Failed to add the rport\n"); 268 lport->tt.rport_logoff(rdata); 269 kref_put(&rdata->kref, lport->tt.rport_destroy); 270 return; 271 } 272 mutex_lock(&rdata->rp_mutex); 273 if (rdata->rport) 274 FC_RPORT_DBG(rdata, "rport already allocated\n"); 275 rdata->rport = rport; 276 rport->maxframe_size = rdata->maxframe_size; 277 rport->supported_classes = rdata->supported_classes; 278 279 rpriv = rport->dd_data; 280 rpriv->local_port = lport; 281 rpriv->rp_state = rdata->rp_state; 282 rpriv->flags = rdata->flags; 283 rpriv->e_d_tov = rdata->e_d_tov; 284 rpriv->r_a_tov = rdata->r_a_tov; 285 mutex_unlock(&rdata->rp_mutex); 286 287 if (rport_ops && rport_ops->event_callback) { 288 FC_RPORT_DBG(rdata, "callback ev %d\n", event); 289 rport_ops->event_callback(lport, rdata, event); 290 } 291 kref_put(&rdata->kref, lport->tt.rport_destroy); 292 break; 293 294 case RPORT_EV_FAILED: 295 case RPORT_EV_LOGO: 296 case RPORT_EV_STOP: 297 port_id = rdata->ids.port_id; 298 mutex_unlock(&rdata->rp_mutex); 299 300 if (port_id != FC_FID_DIR_SERV) { 301 /* 302 * We must drop rp_mutex before taking disc_mutex. 303 * Re-evaluate state to allow for restart. 304 * A transition to RESTART state must only happen 305 * while disc_mutex is held and rdata is on the list. 306 */ 307 mutex_lock(&lport->disc.disc_mutex); 308 mutex_lock(&rdata->rp_mutex); 309 if (rdata->rp_state == RPORT_ST_RESTART) 310 restart = 1; 311 else 312 list_del(&rdata->peers); 313 mutex_unlock(&rdata->rp_mutex); 314 mutex_unlock(&lport->disc.disc_mutex); 315 } 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 if (restart) { 338 mutex_lock(&rdata->rp_mutex); 339 FC_RPORT_DBG(rdata, "work restart\n"); 340 fc_rport_enter_plogi(rdata); 341 mutex_unlock(&rdata->rp_mutex); 342 } else 343 kref_put(&rdata->kref, lport->tt.rport_destroy); 344 break; 345 346 default: 347 mutex_unlock(&rdata->rp_mutex); 348 break; 349 } 350 } 351 352 /** 353 * fc_rport_login() - Start the remote port login state machine 354 * @rdata: The remote port to be logged in to 355 * 356 * Locking Note: Called without the rport lock held. This 357 * function will hold the rport lock, call an _enter_* 358 * function and then unlock the rport. 359 * 360 * This indicates the intent to be logged into the remote port. 361 * If it appears we are already logged in, ADISC is used to verify 362 * the setup. 363 */ 364 int fc_rport_login(struct fc_rport_priv *rdata) 365 { 366 mutex_lock(&rdata->rp_mutex); 367 368 switch (rdata->rp_state) { 369 case RPORT_ST_READY: 370 FC_RPORT_DBG(rdata, "ADISC port\n"); 371 fc_rport_enter_adisc(rdata); 372 break; 373 case RPORT_ST_RESTART: 374 break; 375 case RPORT_ST_DELETE: 376 FC_RPORT_DBG(rdata, "Restart deleted port\n"); 377 fc_rport_state_enter(rdata, RPORT_ST_RESTART); 378 break; 379 default: 380 FC_RPORT_DBG(rdata, "Login to port\n"); 381 fc_rport_enter_plogi(rdata); 382 break; 383 } 384 mutex_unlock(&rdata->rp_mutex); 385 386 return 0; 387 } 388 389 /** 390 * fc_rport_enter_delete() - Schedule a remote port to be deleted 391 * @rdata: The remote port to be deleted 392 * @event: The event to report as the reason for deletion 393 * 394 * Locking Note: Called with the rport lock held. 395 * 396 * Allow state change into DELETE only once. 397 * 398 * Call queue_work only if there's no event already pending. 399 * Set the new event so that the old pending event will not occur. 400 * Since we have the mutex, even if fc_rport_work() is already started, 401 * it'll see the new event. 402 */ 403 static void fc_rport_enter_delete(struct fc_rport_priv *rdata, 404 enum fc_rport_event event) 405 { 406 if (rdata->rp_state == RPORT_ST_DELETE) 407 return; 408 409 FC_RPORT_DBG(rdata, "Delete port\n"); 410 411 fc_rport_state_enter(rdata, RPORT_ST_DELETE); 412 413 if (rdata->event == RPORT_EV_NONE) 414 queue_work(rport_event_queue, &rdata->event_work); 415 rdata->event = event; 416 } 417 418 /** 419 * fc_rport_logoff() - Logoff and remove a remote port 420 * @rdata: The remote port to be logged off of 421 * 422 * Locking Note: Called without the rport lock held. This 423 * function will hold the rport lock, call an _enter_* 424 * function and then unlock the rport. 425 */ 426 int fc_rport_logoff(struct fc_rport_priv *rdata) 427 { 428 mutex_lock(&rdata->rp_mutex); 429 430 FC_RPORT_DBG(rdata, "Remove port\n"); 431 432 if (rdata->rp_state == RPORT_ST_DELETE) { 433 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); 434 goto out; 435 } 436 437 if (rdata->rp_state == RPORT_ST_RESTART) 438 FC_RPORT_DBG(rdata, "Port in Restart state, deleting\n"); 439 else 440 fc_rport_enter_logo(rdata); 441 442 /* 443 * Change the state to Delete so that we discard 444 * the response. 445 */ 446 fc_rport_enter_delete(rdata, RPORT_EV_STOP); 447 out: 448 mutex_unlock(&rdata->rp_mutex); 449 return 0; 450 } 451 452 /** 453 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state 454 * @rdata: The remote port that is ready 455 * 456 * Locking Note: The rport lock is expected to be held before calling 457 * this routine. 458 */ 459 static void fc_rport_enter_ready(struct fc_rport_priv *rdata) 460 { 461 fc_rport_state_enter(rdata, RPORT_ST_READY); 462 463 FC_RPORT_DBG(rdata, "Port is Ready\n"); 464 465 if (rdata->event == RPORT_EV_NONE) 466 queue_work(rport_event_queue, &rdata->event_work); 467 rdata->event = RPORT_EV_READY; 468 } 469 470 /** 471 * fc_rport_timeout() - Handler for the retry_work timer 472 * @work: Handle to the remote port that has timed out 473 * 474 * Locking Note: Called without the rport lock held. This 475 * function will hold the rport lock, call an _enter_* 476 * function and then unlock the rport. 477 */ 478 static void fc_rport_timeout(struct work_struct *work) 479 { 480 struct fc_rport_priv *rdata = 481 container_of(work, struct fc_rport_priv, retry_work.work); 482 483 mutex_lock(&rdata->rp_mutex); 484 485 switch (rdata->rp_state) { 486 case RPORT_ST_PLOGI: 487 fc_rport_enter_plogi(rdata); 488 break; 489 case RPORT_ST_PRLI: 490 fc_rport_enter_prli(rdata); 491 break; 492 case RPORT_ST_RTV: 493 fc_rport_enter_rtv(rdata); 494 break; 495 case RPORT_ST_LOGO: 496 fc_rport_enter_logo(rdata); 497 break; 498 case RPORT_ST_ADISC: 499 fc_rport_enter_adisc(rdata); 500 break; 501 case RPORT_ST_READY: 502 case RPORT_ST_INIT: 503 case RPORT_ST_DELETE: 504 case RPORT_ST_RESTART: 505 break; 506 } 507 508 mutex_unlock(&rdata->rp_mutex); 509 } 510 511 /** 512 * fc_rport_error() - Error handler, called once retries have been exhausted 513 * @rdata: The remote port the error is happened on 514 * @fp: The error code encapsulated in a frame pointer 515 * 516 * Locking Note: The rport lock is expected to be held before 517 * calling this routine 518 */ 519 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) 520 { 521 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", 522 IS_ERR(fp) ? -PTR_ERR(fp) : 0, 523 fc_rport_state(rdata), rdata->retries); 524 525 switch (rdata->rp_state) { 526 case RPORT_ST_PLOGI: 527 case RPORT_ST_LOGO: 528 fc_rport_enter_delete(rdata, RPORT_EV_FAILED); 529 break; 530 case RPORT_ST_RTV: 531 fc_rport_enter_ready(rdata); 532 break; 533 case RPORT_ST_PRLI: 534 case RPORT_ST_ADISC: 535 fc_rport_enter_logo(rdata); 536 break; 537 case RPORT_ST_DELETE: 538 case RPORT_ST_RESTART: 539 case RPORT_ST_READY: 540 case RPORT_ST_INIT: 541 break; 542 } 543 } 544 545 /** 546 * fc_rport_error_retry() - Handler for remote port state retries 547 * @rdata: The remote port whose state is to be retried 548 * @fp: The error code encapsulated in a frame pointer 549 * 550 * If the error was an exchange timeout retry immediately, 551 * otherwise wait for E_D_TOV. 552 * 553 * Locking Note: The rport lock is expected to be held before 554 * calling this routine 555 */ 556 static void fc_rport_error_retry(struct fc_rport_priv *rdata, 557 struct fc_frame *fp) 558 { 559 unsigned long delay = FC_DEF_E_D_TOV; 560 561 /* make sure this isn't an FC_EX_CLOSED error, never retry those */ 562 if (PTR_ERR(fp) == -FC_EX_CLOSED) 563 return fc_rport_error(rdata, fp); 564 565 if (rdata->retries < rdata->local_port->max_rport_retry_count) { 566 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", 567 PTR_ERR(fp), fc_rport_state(rdata)); 568 rdata->retries++; 569 /* no additional delay on exchange timeouts */ 570 if (PTR_ERR(fp) == -FC_EX_TIMEOUT) 571 delay = 0; 572 schedule_delayed_work(&rdata->retry_work, delay); 573 return; 574 } 575 576 return fc_rport_error(rdata, fp); 577 } 578 579 /** 580 * fc_rport_plogi_recv_resp() - Handler for ELS PLOGI responses 581 * @sp: The sequence the PLOGI is on 582 * @fp: The PLOGI response frame 583 * @rdata_arg: The remote port that sent the PLOGI response 584 * 585 * Locking Note: This function will be called without the rport lock 586 * held, but it will lock, call an _enter_* function or fc_rport_error 587 * and then unlock the rport. 588 */ 589 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, 590 void *rdata_arg) 591 { 592 struct fc_rport_priv *rdata = rdata_arg; 593 struct fc_lport *lport = rdata->local_port; 594 struct fc_els_flogi *plp = NULL; 595 unsigned int tov; 596 u16 csp_seq; 597 u16 cssp_seq; 598 u8 op; 599 600 mutex_lock(&rdata->rp_mutex); 601 602 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); 603 604 if (rdata->rp_state != RPORT_ST_PLOGI) { 605 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " 606 "%s\n", fc_rport_state(rdata)); 607 if (IS_ERR(fp)) 608 goto err; 609 goto out; 610 } 611 612 if (IS_ERR(fp)) { 613 fc_rport_error_retry(rdata, fp); 614 goto err; 615 } 616 617 op = fc_frame_payload_op(fp); 618 if (op == ELS_LS_ACC && 619 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { 620 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); 621 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); 622 623 tov = ntohl(plp->fl_csp.sp_e_d_tov); 624 if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR) 625 tov /= 1000; 626 if (tov > rdata->e_d_tov) 627 rdata->e_d_tov = tov; 628 csp_seq = ntohs(plp->fl_csp.sp_tot_seq); 629 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); 630 if (cssp_seq < csp_seq) 631 csp_seq = cssp_seq; 632 rdata->max_seq = csp_seq; 633 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); 634 fc_rport_enter_prli(rdata); 635 } else 636 fc_rport_error_retry(rdata, fp); 637 638 out: 639 fc_frame_free(fp); 640 err: 641 mutex_unlock(&rdata->rp_mutex); 642 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 643 } 644 645 /** 646 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request 647 * @rdata: The remote port to send a PLOGI to 648 * 649 * Locking Note: The rport lock is expected to be held before calling 650 * this routine. 651 */ 652 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) 653 { 654 struct fc_lport *lport = rdata->local_port; 655 struct fc_frame *fp; 656 657 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", 658 fc_rport_state(rdata)); 659 660 fc_rport_state_enter(rdata, RPORT_ST_PLOGI); 661 662 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 663 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 664 if (!fp) { 665 fc_rport_error_retry(rdata, fp); 666 return; 667 } 668 rdata->e_d_tov = lport->e_d_tov; 669 670 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, 671 fc_rport_plogi_resp, rdata, 672 2 * lport->r_a_tov)) 673 fc_rport_error_retry(rdata, NULL); 674 else 675 kref_get(&rdata->kref); 676 } 677 678 /** 679 * fc_rport_prli_resp() - Process Login (PRLI) response handler 680 * @sp: The sequence the PRLI response was on 681 * @fp: The PRLI response frame 682 * @rdata_arg: The remote port that sent the PRLI response 683 * 684 * Locking Note: This function will be called without the rport lock 685 * held, but it will lock, call an _enter_* function or fc_rport_error 686 * and then unlock the rport. 687 */ 688 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, 689 void *rdata_arg) 690 { 691 struct fc_rport_priv *rdata = rdata_arg; 692 struct { 693 struct fc_els_prli prli; 694 struct fc_els_spp spp; 695 } *pp; 696 u32 roles = FC_RPORT_ROLE_UNKNOWN; 697 u32 fcp_parm = 0; 698 u8 op; 699 700 mutex_lock(&rdata->rp_mutex); 701 702 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); 703 704 if (rdata->rp_state != RPORT_ST_PRLI) { 705 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " 706 "%s\n", fc_rport_state(rdata)); 707 if (IS_ERR(fp)) 708 goto err; 709 goto out; 710 } 711 712 if (IS_ERR(fp)) { 713 fc_rport_error_retry(rdata, fp); 714 goto err; 715 } 716 717 /* reinitialize remote port roles */ 718 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 719 720 op = fc_frame_payload_op(fp); 721 if (op == ELS_LS_ACC) { 722 pp = fc_frame_payload_get(fp, sizeof(*pp)); 723 if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) { 724 fcp_parm = ntohl(pp->spp.spp_params); 725 if (fcp_parm & FCP_SPPF_RETRY) 726 rdata->flags |= FC_RP_FLAGS_RETRY; 727 } 728 729 rdata->supported_classes = FC_COS_CLASS3; 730 if (fcp_parm & FCP_SPPF_INIT_FCN) 731 roles |= FC_RPORT_ROLE_FCP_INITIATOR; 732 if (fcp_parm & FCP_SPPF_TARG_FCN) 733 roles |= FC_RPORT_ROLE_FCP_TARGET; 734 735 rdata->ids.roles = roles; 736 fc_rport_enter_rtv(rdata); 737 738 } else { 739 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); 740 fc_rport_enter_delete(rdata, RPORT_EV_FAILED); 741 } 742 743 out: 744 fc_frame_free(fp); 745 err: 746 mutex_unlock(&rdata->rp_mutex); 747 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 748 } 749 750 /** 751 * fc_rport_logo_resp() - Handler for logout (LOGO) responses 752 * @sp: The sequence the LOGO was on 753 * @fp: The LOGO response frame 754 * @rdata_arg: The remote port that sent the LOGO response 755 * 756 * Locking Note: This function will be called without the rport lock 757 * held, but it will lock, call an _enter_* function or fc_rport_error 758 * and then unlock the rport. 759 */ 760 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 761 void *rdata_arg) 762 { 763 struct fc_rport_priv *rdata = rdata_arg; 764 u8 op; 765 766 mutex_lock(&rdata->rp_mutex); 767 768 FC_RPORT_DBG(rdata, "Received a LOGO %s\n", fc_els_resp_type(fp)); 769 770 if (rdata->rp_state != RPORT_ST_LOGO) { 771 FC_RPORT_DBG(rdata, "Received a LOGO response, but in state " 772 "%s\n", fc_rport_state(rdata)); 773 if (IS_ERR(fp)) 774 goto err; 775 goto out; 776 } 777 778 if (IS_ERR(fp)) { 779 fc_rport_error_retry(rdata, fp); 780 goto err; 781 } 782 783 op = fc_frame_payload_op(fp); 784 if (op != ELS_LS_ACC) 785 FC_RPORT_DBG(rdata, "Bad ELS response op %x for LOGO command\n", 786 op); 787 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 788 789 out: 790 fc_frame_free(fp); 791 err: 792 mutex_unlock(&rdata->rp_mutex); 793 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 794 } 795 796 /** 797 * fc_rport_enter_prli() - Send Process Login (PRLI) request 798 * @rdata: The remote port to send the PRLI request to 799 * 800 * Locking Note: The rport lock is expected to be held before calling 801 * this routine. 802 */ 803 static void fc_rport_enter_prli(struct fc_rport_priv *rdata) 804 { 805 struct fc_lport *lport = rdata->local_port; 806 struct { 807 struct fc_els_prli prli; 808 struct fc_els_spp spp; 809 } *pp; 810 struct fc_frame *fp; 811 812 /* 813 * If the rport is one of the well known addresses 814 * we skip PRLI and RTV and go straight to READY. 815 */ 816 if (rdata->ids.port_id >= FC_FID_DOM_MGR) { 817 fc_rport_enter_ready(rdata); 818 return; 819 } 820 821 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", 822 fc_rport_state(rdata)); 823 824 fc_rport_state_enter(rdata, RPORT_ST_PRLI); 825 826 fp = fc_frame_alloc(lport, sizeof(*pp)); 827 if (!fp) { 828 fc_rport_error_retry(rdata, fp); 829 return; 830 } 831 832 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI, 833 fc_rport_prli_resp, rdata, 834 2 * lport->r_a_tov)) 835 fc_rport_error_retry(rdata, NULL); 836 else 837 kref_get(&rdata->kref); 838 } 839 840 /** 841 * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses 842 * @sp: The sequence the RTV was on 843 * @fp: The RTV response frame 844 * @rdata_arg: The remote port that sent the RTV response 845 * 846 * Many targets don't seem to support this. 847 * 848 * Locking Note: This function will be called without the rport lock 849 * held, but it will lock, call an _enter_* function or fc_rport_error 850 * and then unlock the rport. 851 */ 852 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, 853 void *rdata_arg) 854 { 855 struct fc_rport_priv *rdata = rdata_arg; 856 u8 op; 857 858 mutex_lock(&rdata->rp_mutex); 859 860 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); 861 862 if (rdata->rp_state != RPORT_ST_RTV) { 863 FC_RPORT_DBG(rdata, "Received a RTV response, but in state " 864 "%s\n", fc_rport_state(rdata)); 865 if (IS_ERR(fp)) 866 goto err; 867 goto out; 868 } 869 870 if (IS_ERR(fp)) { 871 fc_rport_error(rdata, fp); 872 goto err; 873 } 874 875 op = fc_frame_payload_op(fp); 876 if (op == ELS_LS_ACC) { 877 struct fc_els_rtv_acc *rtv; 878 u32 toq; 879 u32 tov; 880 881 rtv = fc_frame_payload_get(fp, sizeof(*rtv)); 882 if (rtv) { 883 toq = ntohl(rtv->rtv_toq); 884 tov = ntohl(rtv->rtv_r_a_tov); 885 if (tov == 0) 886 tov = 1; 887 rdata->r_a_tov = tov; 888 tov = ntohl(rtv->rtv_e_d_tov); 889 if (toq & FC_ELS_RTV_EDRES) 890 tov /= 1000000; 891 if (tov == 0) 892 tov = 1; 893 rdata->e_d_tov = tov; 894 } 895 } 896 897 fc_rport_enter_ready(rdata); 898 899 out: 900 fc_frame_free(fp); 901 err: 902 mutex_unlock(&rdata->rp_mutex); 903 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 904 } 905 906 /** 907 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request 908 * @rdata: The remote port to send the RTV request to 909 * 910 * Locking Note: The rport lock is expected to be held before calling 911 * this routine. 912 */ 913 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) 914 { 915 struct fc_frame *fp; 916 struct fc_lport *lport = rdata->local_port; 917 918 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", 919 fc_rport_state(rdata)); 920 921 fc_rport_state_enter(rdata, RPORT_ST_RTV); 922 923 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); 924 if (!fp) { 925 fc_rport_error_retry(rdata, fp); 926 return; 927 } 928 929 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, 930 fc_rport_rtv_resp, rdata, 931 2 * lport->r_a_tov)) 932 fc_rport_error_retry(rdata, NULL); 933 else 934 kref_get(&rdata->kref); 935 } 936 937 /** 938 * fc_rport_enter_logo() - Send a logout (LOGO) request 939 * @rdata: The remote port to send the LOGO request to 940 * 941 * Locking Note: The rport lock is expected to be held before calling 942 * this routine. 943 */ 944 static void fc_rport_enter_logo(struct fc_rport_priv *rdata) 945 { 946 struct fc_lport *lport = rdata->local_port; 947 struct fc_frame *fp; 948 949 FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n", 950 fc_rport_state(rdata)); 951 952 fc_rport_state_enter(rdata, RPORT_ST_LOGO); 953 954 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); 955 if (!fp) { 956 fc_rport_error_retry(rdata, fp); 957 return; 958 } 959 960 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, 961 fc_rport_logo_resp, rdata, 962 2 * lport->r_a_tov)) 963 fc_rport_error_retry(rdata, NULL); 964 else 965 kref_get(&rdata->kref); 966 } 967 968 /** 969 * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses 970 * @sp: The sequence the ADISC response was on 971 * @fp: The ADISC response frame 972 * @rdata_arg: The remote port that sent the ADISC response 973 * 974 * Locking Note: This function will be called without the rport lock 975 * held, but it will lock, call an _enter_* function or fc_rport_error 976 * and then unlock the rport. 977 */ 978 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, 979 void *rdata_arg) 980 { 981 struct fc_rport_priv *rdata = rdata_arg; 982 struct fc_els_adisc *adisc; 983 u8 op; 984 985 mutex_lock(&rdata->rp_mutex); 986 987 FC_RPORT_DBG(rdata, "Received a ADISC response\n"); 988 989 if (rdata->rp_state != RPORT_ST_ADISC) { 990 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", 991 fc_rport_state(rdata)); 992 if (IS_ERR(fp)) 993 goto err; 994 goto out; 995 } 996 997 if (IS_ERR(fp)) { 998 fc_rport_error(rdata, fp); 999 goto err; 1000 } 1001 1002 /* 1003 * If address verification failed. Consider us logged out of the rport. 1004 * Since the rport is still in discovery, we want to be 1005 * logged in, so go to PLOGI state. Otherwise, go back to READY. 1006 */ 1007 op = fc_frame_payload_op(fp); 1008 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1009 if (op != ELS_LS_ACC || !adisc || 1010 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || 1011 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || 1012 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { 1013 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); 1014 fc_rport_enter_plogi(rdata); 1015 } else { 1016 FC_RPORT_DBG(rdata, "ADISC OK\n"); 1017 fc_rport_enter_ready(rdata); 1018 } 1019 out: 1020 fc_frame_free(fp); 1021 err: 1022 mutex_unlock(&rdata->rp_mutex); 1023 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); 1024 } 1025 1026 /** 1027 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request 1028 * @rdata: The remote port to send the ADISC request to 1029 * 1030 * Locking Note: The rport lock is expected to be held before calling 1031 * this routine. 1032 */ 1033 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) 1034 { 1035 struct fc_lport *lport = rdata->local_port; 1036 struct fc_frame *fp; 1037 1038 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", 1039 fc_rport_state(rdata)); 1040 1041 fc_rport_state_enter(rdata, RPORT_ST_ADISC); 1042 1043 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); 1044 if (!fp) { 1045 fc_rport_error_retry(rdata, fp); 1046 return; 1047 } 1048 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, 1049 fc_rport_adisc_resp, rdata, 1050 2 * lport->r_a_tov)) 1051 fc_rport_error_retry(rdata, NULL); 1052 else 1053 kref_get(&rdata->kref); 1054 } 1055 1056 /** 1057 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests 1058 * @rdata: The remote port that sent the ADISC request 1059 * @sp: The sequence the ADISC request was on 1060 * @in_fp: The ADISC request frame 1061 * 1062 * Locking Note: Called with the lport and rport locks held. 1063 */ 1064 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, 1065 struct fc_seq *sp, struct fc_frame *in_fp) 1066 { 1067 struct fc_lport *lport = rdata->local_port; 1068 struct fc_frame *fp; 1069 struct fc_exch *ep = fc_seq_exch(sp); 1070 struct fc_els_adisc *adisc; 1071 struct fc_seq_els_data rjt_data; 1072 u32 f_ctl; 1073 1074 FC_RPORT_DBG(rdata, "Received ADISC request\n"); 1075 1076 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); 1077 if (!adisc) { 1078 rjt_data.fp = NULL; 1079 rjt_data.reason = ELS_RJT_PROT; 1080 rjt_data.explan = ELS_EXPL_INV_LEN; 1081 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1082 goto drop; 1083 } 1084 1085 fp = fc_frame_alloc(lport, sizeof(*adisc)); 1086 if (!fp) 1087 goto drop; 1088 fc_adisc_fill(lport, fp); 1089 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1090 adisc->adisc_cmd = ELS_LS_ACC; 1091 sp = lport->tt.seq_start_next(sp); 1092 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1093 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1094 FC_TYPE_ELS, f_ctl, 0); 1095 lport->tt.seq_send(lport, sp, fp); 1096 drop: 1097 fc_frame_free(in_fp); 1098 } 1099 1100 /** 1101 * fc_rport_recv_els_req() - Handler for validated ELS requests 1102 * @lport: The local port that received the ELS request 1103 * @sp: The sequence that the ELS request was on 1104 * @fp: The ELS request frame 1105 * 1106 * Handle incoming ELS requests that require port login. 1107 * The ELS opcode has already been validated by the caller. 1108 * 1109 * Locking Note: Called with the lport lock held. 1110 */ 1111 static void fc_rport_recv_els_req(struct fc_lport *lport, 1112 struct fc_seq *sp, struct fc_frame *fp) 1113 { 1114 struct fc_rport_priv *rdata; 1115 struct fc_frame_header *fh; 1116 struct fc_seq_els_data els_data; 1117 1118 els_data.fp = NULL; 1119 els_data.reason = ELS_RJT_UNAB; 1120 els_data.explan = ELS_EXPL_PLOGI_REQD; 1121 1122 fh = fc_frame_header_get(fp); 1123 1124 mutex_lock(&lport->disc.disc_mutex); 1125 rdata = lport->tt.rport_lookup(lport, ntoh24(fh->fh_s_id)); 1126 if (!rdata) { 1127 mutex_unlock(&lport->disc.disc_mutex); 1128 goto reject; 1129 } 1130 mutex_lock(&rdata->rp_mutex); 1131 mutex_unlock(&lport->disc.disc_mutex); 1132 1133 switch (rdata->rp_state) { 1134 case RPORT_ST_PRLI: 1135 case RPORT_ST_RTV: 1136 case RPORT_ST_READY: 1137 case RPORT_ST_ADISC: 1138 break; 1139 default: 1140 mutex_unlock(&rdata->rp_mutex); 1141 goto reject; 1142 } 1143 1144 switch (fc_frame_payload_op(fp)) { 1145 case ELS_PRLI: 1146 fc_rport_recv_prli_req(rdata, sp, fp); 1147 break; 1148 case ELS_PRLO: 1149 fc_rport_recv_prlo_req(rdata, sp, fp); 1150 break; 1151 case ELS_ADISC: 1152 fc_rport_recv_adisc_req(rdata, sp, fp); 1153 break; 1154 case ELS_RRQ: 1155 els_data.fp = fp; 1156 lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data); 1157 break; 1158 case ELS_REC: 1159 els_data.fp = fp; 1160 lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data); 1161 break; 1162 default: 1163 fc_frame_free(fp); /* can't happen */ 1164 break; 1165 } 1166 1167 mutex_unlock(&rdata->rp_mutex); 1168 return; 1169 1170 reject: 1171 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); 1172 fc_frame_free(fp); 1173 } 1174 1175 /** 1176 * fc_rport_recv_req() - Handler for requests 1177 * @sp: The sequence the request was on 1178 * @fp: The request frame 1179 * @lport: The local port that received the request 1180 * 1181 * Locking Note: Called with the lport lock held. 1182 */ 1183 void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp, 1184 struct fc_lport *lport) 1185 { 1186 struct fc_seq_els_data els_data; 1187 1188 /* 1189 * Handle PLOGI and LOGO requests separately, since they 1190 * don't require prior login. 1191 * Check for unsupported opcodes first and reject them. 1192 * For some ops, it would be incorrect to reject with "PLOGI required". 1193 */ 1194 switch (fc_frame_payload_op(fp)) { 1195 case ELS_PLOGI: 1196 fc_rport_recv_plogi_req(lport, sp, fp); 1197 break; 1198 case ELS_LOGO: 1199 fc_rport_recv_logo_req(lport, sp, fp); 1200 break; 1201 case ELS_PRLI: 1202 case ELS_PRLO: 1203 case ELS_ADISC: 1204 case ELS_RRQ: 1205 case ELS_REC: 1206 fc_rport_recv_els_req(lport, sp, fp); 1207 break; 1208 default: 1209 fc_frame_free(fp); 1210 els_data.fp = NULL; 1211 els_data.reason = ELS_RJT_UNSUP; 1212 els_data.explan = ELS_EXPL_NONE; 1213 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); 1214 break; 1215 } 1216 } 1217 1218 /** 1219 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests 1220 * @lport: The local port that received the PLOGI request 1221 * @sp: The sequence that the PLOGI request was on 1222 * @rx_fp: The PLOGI request frame 1223 * 1224 * Locking Note: The rport lock is held before calling this function. 1225 */ 1226 static void fc_rport_recv_plogi_req(struct fc_lport *lport, 1227 struct fc_seq *sp, struct fc_frame *rx_fp) 1228 { 1229 struct fc_disc *disc; 1230 struct fc_rport_priv *rdata; 1231 struct fc_frame *fp = rx_fp; 1232 struct fc_exch *ep; 1233 struct fc_frame_header *fh; 1234 struct fc_els_flogi *pl; 1235 struct fc_seq_els_data rjt_data; 1236 u32 sid, f_ctl; 1237 1238 rjt_data.fp = NULL; 1239 fh = fc_frame_header_get(fp); 1240 sid = ntoh24(fh->fh_s_id); 1241 1242 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); 1243 1244 pl = fc_frame_payload_get(fp, sizeof(*pl)); 1245 if (!pl) { 1246 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); 1247 rjt_data.reason = ELS_RJT_PROT; 1248 rjt_data.explan = ELS_EXPL_INV_LEN; 1249 goto reject; 1250 } 1251 1252 disc = &lport->disc; 1253 mutex_lock(&disc->disc_mutex); 1254 rdata = lport->tt.rport_create(lport, sid); 1255 if (!rdata) { 1256 mutex_unlock(&disc->disc_mutex); 1257 rjt_data.reason = ELS_RJT_UNAB; 1258 rjt_data.explan = ELS_EXPL_INSUF_RES; 1259 goto reject; 1260 } 1261 1262 mutex_lock(&rdata->rp_mutex); 1263 mutex_unlock(&disc->disc_mutex); 1264 1265 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); 1266 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); 1267 1268 /* 1269 * If the rport was just created, possibly due to the incoming PLOGI, 1270 * set the state appropriately and accept the PLOGI. 1271 * 1272 * If we had also sent a PLOGI, and if the received PLOGI is from a 1273 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason 1274 * "command already in progress". 1275 * 1276 * XXX TBD: If the session was ready before, the PLOGI should result in 1277 * all outstanding exchanges being reset. 1278 */ 1279 switch (rdata->rp_state) { 1280 case RPORT_ST_INIT: 1281 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); 1282 break; 1283 case RPORT_ST_PLOGI: 1284 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); 1285 if (rdata->ids.port_name < lport->wwpn) { 1286 mutex_unlock(&rdata->rp_mutex); 1287 rjt_data.reason = ELS_RJT_INPROG; 1288 rjt_data.explan = ELS_EXPL_NONE; 1289 goto reject; 1290 } 1291 break; 1292 case RPORT_ST_PRLI: 1293 case RPORT_ST_RTV: 1294 case RPORT_ST_READY: 1295 case RPORT_ST_ADISC: 1296 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " 1297 "- ignored for now\n", rdata->rp_state); 1298 /* XXX TBD - should reset */ 1299 break; 1300 case RPORT_ST_DELETE: 1301 case RPORT_ST_LOGO: 1302 case RPORT_ST_RESTART: 1303 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", 1304 fc_rport_state(rdata)); 1305 mutex_unlock(&rdata->rp_mutex); 1306 rjt_data.reason = ELS_RJT_BUSY; 1307 rjt_data.explan = ELS_EXPL_NONE; 1308 goto reject; 1309 } 1310 1311 /* 1312 * Get session payload size from incoming PLOGI. 1313 */ 1314 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); 1315 fc_frame_free(rx_fp); 1316 1317 /* 1318 * Send LS_ACC. If this fails, the originator should retry. 1319 */ 1320 sp = lport->tt.seq_start_next(sp); 1321 if (!sp) 1322 goto out; 1323 fp = fc_frame_alloc(lport, sizeof(*pl)); 1324 if (!fp) 1325 goto out; 1326 1327 fc_plogi_fill(lport, fp, ELS_LS_ACC); 1328 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1329 ep = fc_seq_exch(sp); 1330 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1331 FC_TYPE_ELS, f_ctl, 0); 1332 lport->tt.seq_send(lport, sp, fp); 1333 fc_rport_enter_prli(rdata); 1334 out: 1335 mutex_unlock(&rdata->rp_mutex); 1336 return; 1337 1338 reject: 1339 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1340 fc_frame_free(fp); 1341 } 1342 1343 /** 1344 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests 1345 * @rdata: The remote port that sent the PRLI request 1346 * @sp: The sequence that the PRLI was on 1347 * @rx_fp: The PRLI request frame 1348 * 1349 * Locking Note: The rport lock is exected to be held before calling 1350 * this function. 1351 */ 1352 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, 1353 struct fc_seq *sp, struct fc_frame *rx_fp) 1354 { 1355 struct fc_lport *lport = rdata->local_port; 1356 struct fc_exch *ep; 1357 struct fc_frame *fp; 1358 struct fc_frame_header *fh; 1359 struct { 1360 struct fc_els_prli prli; 1361 struct fc_els_spp spp; 1362 } *pp; 1363 struct fc_els_spp *rspp; /* request service param page */ 1364 struct fc_els_spp *spp; /* response spp */ 1365 unsigned int len; 1366 unsigned int plen; 1367 enum fc_els_rjt_reason reason = ELS_RJT_UNAB; 1368 enum fc_els_rjt_explan explan = ELS_EXPL_NONE; 1369 enum fc_els_spp_resp resp; 1370 struct fc_seq_els_data rjt_data; 1371 u32 f_ctl; 1372 u32 fcp_parm; 1373 u32 roles = FC_RPORT_ROLE_UNKNOWN; 1374 rjt_data.fp = NULL; 1375 1376 fh = fc_frame_header_get(rx_fp); 1377 1378 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", 1379 fc_rport_state(rdata)); 1380 1381 switch (rdata->rp_state) { 1382 case RPORT_ST_PRLI: 1383 case RPORT_ST_RTV: 1384 case RPORT_ST_READY: 1385 case RPORT_ST_ADISC: 1386 reason = ELS_RJT_NONE; 1387 break; 1388 default: 1389 fc_frame_free(rx_fp); 1390 return; 1391 break; 1392 } 1393 len = fr_len(rx_fp) - sizeof(*fh); 1394 pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); 1395 if (pp == NULL) { 1396 reason = ELS_RJT_PROT; 1397 explan = ELS_EXPL_INV_LEN; 1398 } else { 1399 plen = ntohs(pp->prli.prli_len); 1400 if ((plen % 4) != 0 || plen > len) { 1401 reason = ELS_RJT_PROT; 1402 explan = ELS_EXPL_INV_LEN; 1403 } else if (plen < len) { 1404 len = plen; 1405 } 1406 plen = pp->prli.prli_spp_len; 1407 if ((plen % 4) != 0 || plen < sizeof(*spp) || 1408 plen > len || len < sizeof(*pp)) { 1409 reason = ELS_RJT_PROT; 1410 explan = ELS_EXPL_INV_LEN; 1411 } 1412 rspp = &pp->spp; 1413 } 1414 if (reason != ELS_RJT_NONE || 1415 (fp = fc_frame_alloc(lport, len)) == NULL) { 1416 rjt_data.reason = reason; 1417 rjt_data.explan = explan; 1418 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1419 } else { 1420 sp = lport->tt.seq_start_next(sp); 1421 WARN_ON(!sp); 1422 pp = fc_frame_payload_get(fp, len); 1423 WARN_ON(!pp); 1424 memset(pp, 0, len); 1425 pp->prli.prli_cmd = ELS_LS_ACC; 1426 pp->prli.prli_spp_len = plen; 1427 pp->prli.prli_len = htons(len); 1428 len -= sizeof(struct fc_els_prli); 1429 1430 /* reinitialize remote port roles */ 1431 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 1432 1433 /* 1434 * Go through all the service parameter pages and build 1435 * response. If plen indicates longer SPP than standard, 1436 * use that. The entire response has been pre-cleared above. 1437 */ 1438 spp = &pp->spp; 1439 while (len >= plen) { 1440 spp->spp_type = rspp->spp_type; 1441 spp->spp_type_ext = rspp->spp_type_ext; 1442 spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR; 1443 resp = FC_SPP_RESP_ACK; 1444 if (rspp->spp_flags & FC_SPP_RPA_VAL) 1445 resp = FC_SPP_RESP_NO_PA; 1446 switch (rspp->spp_type) { 1447 case 0: /* common to all FC-4 types */ 1448 break; 1449 case FC_TYPE_FCP: 1450 fcp_parm = ntohl(rspp->spp_params); 1451 if (fcp_parm & FCP_SPPF_RETRY) 1452 rdata->flags |= FC_RP_FLAGS_RETRY; 1453 rdata->supported_classes = FC_COS_CLASS3; 1454 if (fcp_parm & FCP_SPPF_INIT_FCN) 1455 roles |= FC_RPORT_ROLE_FCP_INITIATOR; 1456 if (fcp_parm & FCP_SPPF_TARG_FCN) 1457 roles |= FC_RPORT_ROLE_FCP_TARGET; 1458 rdata->ids.roles = roles; 1459 1460 spp->spp_params = 1461 htonl(lport->service_params); 1462 break; 1463 default: 1464 resp = FC_SPP_RESP_INVL; 1465 break; 1466 } 1467 spp->spp_flags |= resp; 1468 len -= plen; 1469 rspp = (struct fc_els_spp *)((char *)rspp + plen); 1470 spp = (struct fc_els_spp *)((char *)spp + plen); 1471 } 1472 1473 /* 1474 * Send LS_ACC. If this fails, the originator should retry. 1475 */ 1476 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; 1477 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 1478 ep = fc_seq_exch(sp); 1479 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 1480 FC_TYPE_ELS, f_ctl, 0); 1481 lport->tt.seq_send(lport, sp, fp); 1482 1483 /* 1484 * Get lock and re-check state. 1485 */ 1486 switch (rdata->rp_state) { 1487 case RPORT_ST_PRLI: 1488 fc_rport_enter_ready(rdata); 1489 break; 1490 case RPORT_ST_READY: 1491 case RPORT_ST_ADISC: 1492 break; 1493 default: 1494 break; 1495 } 1496 } 1497 fc_frame_free(rx_fp); 1498 } 1499 1500 /** 1501 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests 1502 * @rdata: The remote port that sent the PRLO request 1503 * @sp: The sequence that the PRLO was on 1504 * @fp: The PRLO request frame 1505 * 1506 * Locking Note: The rport lock is exected to be held before calling 1507 * this function. 1508 */ 1509 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, 1510 struct fc_seq *sp, 1511 struct fc_frame *fp) 1512 { 1513 struct fc_lport *lport = rdata->local_port; 1514 1515 struct fc_frame_header *fh; 1516 struct fc_seq_els_data rjt_data; 1517 1518 fh = fc_frame_header_get(fp); 1519 1520 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", 1521 fc_rport_state(rdata)); 1522 1523 rjt_data.fp = NULL; 1524 rjt_data.reason = ELS_RJT_UNAB; 1525 rjt_data.explan = ELS_EXPL_NONE; 1526 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 1527 fc_frame_free(fp); 1528 } 1529 1530 /** 1531 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests 1532 * @lport: The local port that received the LOGO request 1533 * @sp: The sequence that the LOGO request was on 1534 * @fp: The LOGO request frame 1535 * 1536 * Locking Note: The rport lock is exected to be held before calling 1537 * this function. 1538 */ 1539 static void fc_rport_recv_logo_req(struct fc_lport *lport, 1540 struct fc_seq *sp, 1541 struct fc_frame *fp) 1542 { 1543 struct fc_frame_header *fh; 1544 struct fc_rport_priv *rdata; 1545 u32 sid; 1546 1547 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 1548 1549 fh = fc_frame_header_get(fp); 1550 sid = ntoh24(fh->fh_s_id); 1551 1552 mutex_lock(&lport->disc.disc_mutex); 1553 rdata = lport->tt.rport_lookup(lport, sid); 1554 if (rdata) { 1555 mutex_lock(&rdata->rp_mutex); 1556 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", 1557 fc_rport_state(rdata)); 1558 1559 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 1560 1561 /* 1562 * If the remote port was created due to discovery, set state 1563 * to log back in. It may have seen a stale RSCN about us. 1564 */ 1565 if (rdata->disc_id) 1566 fc_rport_state_enter(rdata, RPORT_ST_RESTART); 1567 mutex_unlock(&rdata->rp_mutex); 1568 } else 1569 FC_RPORT_ID_DBG(lport, sid, 1570 "Received LOGO from non-logged-in port\n"); 1571 mutex_unlock(&lport->disc.disc_mutex); 1572 fc_frame_free(fp); 1573 } 1574 1575 /** 1576 * fc_rport_flush_queue() - Flush the rport_event_queue 1577 */ 1578 static void fc_rport_flush_queue(void) 1579 { 1580 flush_workqueue(rport_event_queue); 1581 } 1582 1583 /** 1584 * fc_rport_init() - Initialize the remote port layer for a local port 1585 * @lport: The local port to initialize the remote port layer for 1586 */ 1587 int fc_rport_init(struct fc_lport *lport) 1588 { 1589 if (!lport->tt.rport_lookup) 1590 lport->tt.rport_lookup = fc_rport_lookup; 1591 1592 if (!lport->tt.rport_create) 1593 lport->tt.rport_create = fc_rport_create; 1594 1595 if (!lport->tt.rport_login) 1596 lport->tt.rport_login = fc_rport_login; 1597 1598 if (!lport->tt.rport_logoff) 1599 lport->tt.rport_logoff = fc_rport_logoff; 1600 1601 if (!lport->tt.rport_recv_req) 1602 lport->tt.rport_recv_req = fc_rport_recv_req; 1603 1604 if (!lport->tt.rport_flush_queue) 1605 lport->tt.rport_flush_queue = fc_rport_flush_queue; 1606 1607 if (!lport->tt.rport_destroy) 1608 lport->tt.rport_destroy = fc_rport_destroy; 1609 1610 return 0; 1611 } 1612 EXPORT_SYMBOL(fc_rport_init); 1613 1614 /** 1615 * fc_setup_rport() - Initialize the rport_event_queue 1616 */ 1617 int fc_setup_rport() 1618 { 1619 rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); 1620 if (!rport_event_queue) 1621 return -ENOMEM; 1622 return 0; 1623 } 1624 1625 /** 1626 * fc_destroy_rport() - Destroy the rport_event_queue 1627 */ 1628 void fc_destroy_rport() 1629 { 1630 destroy_workqueue(rport_event_queue); 1631 } 1632 1633 /** 1634 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port 1635 * @rport: The remote port whose I/O should be terminated 1636 */ 1637 void fc_rport_terminate_io(struct fc_rport *rport) 1638 { 1639 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1640 struct fc_lport *lport = rpriv->local_port; 1641 1642 lport->tt.exch_mgr_reset(lport, 0, rport->port_id); 1643 lport->tt.exch_mgr_reset(lport, rport->port_id, 0); 1644 } 1645 EXPORT_SYMBOL(fc_rport_terminate_io); 1646