1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright(c) 2007 Intel Corporation. All rights reserved. 4 * Copyright(c) 2008 Red Hat, Inc. All rights reserved. 5 * Copyright(c) 2008 Mike Christie 6 * 7 * Maintained at www.Open-FCoE.org 8 */ 9 10#include <linux/module.h> 11#include <linux/delay.h> 12#include <linux/kernel.h> 13#include <linux/types.h> 14#include <linux/spinlock.h> 15#include <linux/scatterlist.h> 16#include <linux/err.h> 17#include <linux/crc32.h> 18#include <linux/slab.h> 19 20#include <scsi/scsi_tcq.h> 21#include <scsi/scsi.h> 22#include <scsi/scsi_host.h> 23#include <scsi/scsi_device.h> 24#include <scsi/scsi_cmnd.h> 25 26#include <scsi/fc/fc_fc2.h> 27 28#include <scsi/libfc.h> 29 30#include "fc_encode.h" 31#include "fc_libfc.h" 32 33static struct kmem_cache *scsi_pkt_cachep; 34 35/* SRB state definitions */ 36#define FC_SRB_FREE 0 /* cmd is free */ 37#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 38#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 39#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 40#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ 41#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 42#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 43#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 44 45#define FC_SRB_READ (1 << 1) 46#define FC_SRB_WRITE (1 << 0) 47 48static struct libfc_cmd_priv *libfc_priv(struct scsi_cmnd *cmd) 49{ 50 return scsi_cmd_priv(cmd); 51} 52 53/** 54 * struct fc_fcp_internal - FCP layer internal data 55 * @scsi_pkt_pool: Memory pool to draw FCP packets from 56 * @scsi_queue_lock: Protects the scsi_pkt_queue 57 * @scsi_pkt_queue: Current FCP packets 58 * @last_can_queue_ramp_down_time: ramp down time 59 * @last_can_queue_ramp_up_time: ramp up time 60 * @max_can_queue: max can_queue size 61 */ 62struct fc_fcp_internal { 63 mempool_t *scsi_pkt_pool; 64 spinlock_t scsi_queue_lock; 65 struct list_head scsi_pkt_queue; 66 unsigned long last_can_queue_ramp_down_time; 67 unsigned long last_can_queue_ramp_up_time; 68 int max_can_queue; 69}; 70 71#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 72 73/* 74 * function prototypes 75 * FC scsi I/O related functions 76 */ 77static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 78static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 79static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 80static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 81static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 82static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 83static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); 84static void fc_fcp_timeout(struct timer_list *); 85static void fc_fcp_rec(struct fc_fcp_pkt *); 86static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 87static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 88static void fc_io_compl(struct fc_fcp_pkt *); 89 90static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 91static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 92static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 93 94/* 95 * command status codes 96 */ 97#define FC_COMPLETE 0 98#define FC_CMD_ABORTED 1 99#define FC_CMD_RESET 2 100#define FC_CMD_PLOGO 3 101#define FC_SNS_RCV 4 102#define FC_TRANS_ERR 5 103#define FC_DATA_OVRRUN 6 104#define FC_DATA_UNDRUN 7 105#define FC_ERROR 8 106#define FC_HRD_ERROR 9 107#define FC_CRC_ERROR 10 108#define FC_TIMED_OUT 11 109#define FC_TRANS_RESET 12 110 111/* 112 * Error recovery timeout values. 113 */ 114#define FC_SCSI_TM_TOV (10 * HZ) 115#define FC_HOST_RESET_TIMEOUT (30 * HZ) 116#define FC_CAN_QUEUE_PERIOD (60 * HZ) 117 118#define FC_MAX_ERROR_CNT 5 119#define FC_MAX_RECOV_RETRY 3 120 121#define FC_FCP_DFLT_QUEUE_DEPTH 32 122 123/** 124 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 125 * @lport: The local port that the FCP packet is for 126 * @gfp: GFP flags for allocation 127 * 128 * Return value: fcp_pkt structure or null on allocation failure. 129 * Context: Can be called from process context, no lock is required. 130 */ 131static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 132{ 133 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 134 struct fc_fcp_pkt *fsp; 135 136 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 137 if (fsp) { 138 memset(fsp, 0, sizeof(*fsp)); 139 fsp->lp = lport; 140 fsp->xfer_ddp = FC_XID_UNKNOWN; 141 refcount_set(&fsp->ref_cnt, 1); 142 timer_setup(&fsp->timer, NULL, 0); 143 INIT_LIST_HEAD(&fsp->list); 144 spin_lock_init(&fsp->scsi_pkt_lock); 145 } else { 146 this_cpu_inc(lport->stats->FcpPktAllocFails); 147 } 148 return fsp; 149} 150 151/** 152 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 153 * @fsp: The FCP packet to be released 154 * 155 * Context: Can be called from process or interrupt context, 156 * no lock is required. 157 */ 158static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 159{ 160 if (refcount_dec_and_test(&fsp->ref_cnt)) { 161 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 162 163 mempool_free(fsp, si->scsi_pkt_pool); 164 } 165} 166 167/** 168 * fc_fcp_pkt_hold() - Hold a fcp_pkt 169 * @fsp: The FCP packet to be held 170 */ 171static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 172{ 173 refcount_inc(&fsp->ref_cnt); 174} 175 176/** 177 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt 178 * @seq: The sequence that the FCP packet is on (required by destructor API) 179 * @fsp: The FCP packet to be released 180 * 181 * This routine is called by a destructor callback in the fc_exch_seq_send() 182 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 183 * argument even though it is not used by this routine. 184 * 185 * Context: No locking required. 186 */ 187static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 188{ 189 fc_fcp_pkt_release(fsp); 190} 191 192/** 193 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 194 * @fsp: The FCP packet to be locked and incremented 195 * 196 * We should only return error if we return a command to SCSI-ml before 197 * getting a response. This can happen in cases where we send a abort, but 198 * do not wait for the response and the abort and command can be passing 199 * each other on the wire/network-layer. 200 * 201 * Note: this function locks the packet and gets a reference to allow 202 * callers to call the completion function while the lock is held and 203 * not have to worry about the packets refcount. 204 * 205 * TODO: Maybe we should just have callers grab/release the lock and 206 * have a function that they call to verify the fsp and grab a ref if 207 * needed. 208 */ 209static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 210{ 211 spin_lock_bh(&fsp->scsi_pkt_lock); 212 if (fsp->state & FC_SRB_COMPL) { 213 spin_unlock_bh(&fsp->scsi_pkt_lock); 214 return -EPERM; 215 } 216 217 fc_fcp_pkt_hold(fsp); 218 return 0; 219} 220 221/** 222 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 223 * reference count 224 * @fsp: The FCP packet to be unlocked and decremented 225 */ 226static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 227{ 228 spin_unlock_bh(&fsp->scsi_pkt_lock); 229 fc_fcp_pkt_release(fsp); 230} 231 232/** 233 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 234 * @fsp: The FCP packet to start a timer for 235 * @delay: The timeout period in jiffies 236 */ 237static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 238{ 239 if (!(fsp->state & FC_SRB_COMPL)) { 240 mod_timer(&fsp->timer, jiffies + delay); 241 fsp->timer_delay = delay; 242 } 243} 244 245static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp) 246{ 247 fsp->state |= FC_SRB_ABORTED; 248 fsp->state &= ~FC_SRB_ABORT_PENDING; 249 250 if (fsp->wait_for_comp) 251 complete(&fsp->tm_done); 252 else 253 fc_fcp_complete_locked(fsp); 254} 255 256/** 257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 258 * fcp_pkt 259 * @fsp: The FCP packet to abort exchanges on 260 */ 261static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 262{ 263 int rc; 264 265 if (!fsp->seq_ptr) 266 return -EINVAL; 267 268 if (fsp->state & FC_SRB_ABORT_PENDING) { 269 FC_FCP_DBG(fsp, "abort already pending\n"); 270 return -EBUSY; 271 } 272 273 this_cpu_inc(fsp->lp->stats->FcpPktAborts); 274 275 fsp->state |= FC_SRB_ABORT_PENDING; 276 rc = fc_seq_exch_abort(fsp->seq_ptr, 0); 277 /* 278 * fc_seq_exch_abort() might return -ENXIO if 279 * the sequence is already completed 280 */ 281 if (rc == -ENXIO) { 282 fc_fcp_abort_done(fsp); 283 rc = 0; 284 } 285 return rc; 286} 287 288/** 289 * fc_fcp_retry_cmd() - Retry a fcp_pkt 290 * @fsp: The FCP packet to be retried 291 * @status_code: The FCP status code to set 292 * 293 * Sets the status code to be FC_ERROR and then calls 294 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 295 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 296 * The SCSI-ml will retry the command. 297 */ 298static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code) 299{ 300 if (fsp->seq_ptr) { 301 fc_exch_done(fsp->seq_ptr); 302 fsp->seq_ptr = NULL; 303 } 304 305 fsp->state &= ~FC_SRB_ABORT_PENDING; 306 fsp->io_status = 0; 307 fsp->status_code = status_code; 308 fc_fcp_complete_locked(fsp); 309} 310 311/** 312 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 313 * @fsp: The FCP packet that will manage the DDP frames 314 * @xid: The XID that will be used for the DDP exchange 315 */ 316void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 317{ 318 struct fc_lport *lport; 319 320 lport = fsp->lp; 321 if ((fsp->req_flags & FC_SRB_READ) && 322 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 323 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 324 scsi_sg_count(fsp->cmd))) 325 fsp->xfer_ddp = xid; 326 } 327} 328 329/** 330 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 331 * DDP related resources for a fcp_pkt 332 * @fsp: The FCP packet that DDP had been used on 333 */ 334void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 335{ 336 struct fc_lport *lport; 337 338 if (!fsp) 339 return; 340 341 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 342 return; 343 344 lport = fsp->lp; 345 if (lport->tt.ddp_done) { 346 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 347 fsp->xfer_ddp = FC_XID_UNKNOWN; 348 } 349} 350 351/** 352 * fc_fcp_can_queue_ramp_up() - increases can_queue 353 * @lport: lport to ramp up can_queue 354 */ 355static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 356{ 357 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 358 unsigned long flags; 359 int can_queue; 360 361 spin_lock_irqsave(lport->host->host_lock, flags); 362 363 if (si->last_can_queue_ramp_up_time && 364 (time_before(jiffies, si->last_can_queue_ramp_up_time + 365 FC_CAN_QUEUE_PERIOD))) 366 goto unlock; 367 368 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 369 FC_CAN_QUEUE_PERIOD)) 370 goto unlock; 371 372 si->last_can_queue_ramp_up_time = jiffies; 373 374 can_queue = lport->host->can_queue << 1; 375 if (can_queue >= si->max_can_queue) { 376 can_queue = si->max_can_queue; 377 si->last_can_queue_ramp_down_time = 0; 378 } 379 lport->host->can_queue = can_queue; 380 shost_printk(KERN_ERR, lport->host, "libfc: increased " 381 "can_queue to %d.\n", can_queue); 382 383unlock: 384 spin_unlock_irqrestore(lport->host->host_lock, flags); 385} 386 387/** 388 * fc_fcp_can_queue_ramp_down() - reduces can_queue 389 * @lport: lport to reduce can_queue 390 * 391 * If we are getting memory allocation failures, then we may 392 * be trying to execute too many commands. We let the running 393 * commands complete or timeout, then try again with a reduced 394 * can_queue. Eventually we will hit the point where we run 395 * on all reserved structs. 396 */ 397static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 398{ 399 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 400 unsigned long flags; 401 int can_queue; 402 bool changed = false; 403 404 spin_lock_irqsave(lport->host->host_lock, flags); 405 406 if (si->last_can_queue_ramp_down_time && 407 (time_before(jiffies, si->last_can_queue_ramp_down_time + 408 FC_CAN_QUEUE_PERIOD))) 409 goto unlock; 410 411 si->last_can_queue_ramp_down_time = jiffies; 412 413 can_queue = lport->host->can_queue; 414 can_queue >>= 1; 415 if (!can_queue) 416 can_queue = 1; 417 lport->host->can_queue = can_queue; 418 changed = true; 419 420unlock: 421 spin_unlock_irqrestore(lport->host->host_lock, flags); 422 return changed; 423} 424 425/* 426 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 427 * @lport: fc lport struct 428 * @len: payload length 429 * 430 * Allocates fc_frame structure and buffer but if fails to allocate 431 * then reduce can_queue. 432 */ 433static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 434 size_t len) 435{ 436 struct fc_frame *fp; 437 438 fp = fc_frame_alloc(lport, len); 439 if (likely(fp)) 440 return fp; 441 442 this_cpu_inc(lport->stats->FcpFrameAllocFails); 443 /* error case */ 444 fc_fcp_can_queue_ramp_down(lport); 445 shost_printk(KERN_ERR, lport->host, 446 "libfc: Could not allocate frame, " 447 "reducing can_queue to %d.\n", lport->host->can_queue); 448 return NULL; 449} 450 451/** 452 * get_fsp_rec_tov() - Helper function to get REC_TOV 453 * @fsp: the FCP packet 454 * 455 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 456 */ 457static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 458{ 459 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 460 unsigned int e_d_tov = FC_DEF_E_D_TOV; 461 462 if (rpriv && rpriv->e_d_tov > e_d_tov) 463 e_d_tov = rpriv->e_d_tov; 464 return msecs_to_jiffies(e_d_tov) + HZ; 465} 466 467/** 468 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 469 * @fsp: The FCP packet the data is on 470 * @fp: The data frame 471 */ 472static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 473{ 474 struct scsi_cmnd *sc = fsp->cmd; 475 struct fc_lport *lport = fsp->lp; 476 struct fc_frame_header *fh; 477 size_t start_offset; 478 size_t offset; 479 u32 crc; 480 u32 copy_len = 0; 481 size_t len; 482 void *buf; 483 struct scatterlist *sg; 484 u32 nents; 485 u8 host_bcode = FC_COMPLETE; 486 487 fh = fc_frame_header_get(fp); 488 offset = ntohl(fh->fh_parm_offset); 489 start_offset = offset; 490 len = fr_len(fp) - sizeof(*fh); 491 buf = fc_frame_payload_get(fp, 0); 492 493 /* 494 * if this I/O is ddped then clear it and initiate recovery since data 495 * frames are expected to be placed directly in that case. 496 * 497 * Indicate error to scsi-ml because something went wrong with the 498 * ddp handling to get us here. 499 */ 500 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 501 fc_fcp_ddp_done(fsp); 502 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 503 host_bcode = FC_ERROR; 504 goto err; 505 } 506 if (offset + len > fsp->data_len) { 507 /* this should never happen */ 508 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 509 fc_frame_crc_check(fp)) 510 goto crc_err; 511 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 512 "data_len %x\n", len, offset, fsp->data_len); 513 514 /* Data is corrupted indicate scsi-ml should retry */ 515 host_bcode = FC_DATA_OVRRUN; 516 goto err; 517 } 518 if (offset != fsp->xfer_len) 519 fsp->state |= FC_SRB_DISCONTIG; 520 521 sg = scsi_sglist(sc); 522 nents = scsi_sg_count(sc); 523 524 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 525 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 526 &offset, NULL); 527 } else { 528 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 529 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 530 &offset, &crc); 531 buf = fc_frame_payload_get(fp, 0); 532 if (len % 4) 533 crc = crc32(crc, buf + len, 4 - (len % 4)); 534 535 if (~crc != le32_to_cpu(fr_crc(fp))) { 536crc_err: 537 this_cpu_inc(lport->stats->ErrorFrames); 538 /* per cpu count, not total count, but OK for limit */ 539 if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < FC_MAX_ERROR_CNT) 540 printk(KERN_WARNING "libfc: CRC error on data " 541 "frame for port (%6.6x)\n", 542 lport->port_id); 543 /* 544 * Assume the frame is total garbage. 545 * We may have copied it over the good part 546 * of the buffer. 547 * If so, we need to retry the entire operation. 548 * Otherwise, ignore it. 549 */ 550 if (fsp->state & FC_SRB_DISCONTIG) { 551 host_bcode = FC_CRC_ERROR; 552 goto err; 553 } 554 return; 555 } 556 } 557 558 if (fsp->xfer_contig_end == start_offset) 559 fsp->xfer_contig_end += copy_len; 560 fsp->xfer_len += copy_len; 561 562 /* 563 * In the very rare event that this data arrived after the response 564 * and completes the transfer, call the completion handler. 565 */ 566 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 567 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) { 568 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" ); 569 fc_fcp_complete_locked(fsp); 570 } 571 return; 572err: 573 fc_fcp_recovery(fsp, host_bcode); 574} 575 576/** 577 * fc_fcp_send_data() - Send SCSI data to a target 578 * @fsp: The FCP packet the data is on 579 * @seq: The sequence the data is to be sent on 580 * @offset: The starting offset for this data request 581 * @seq_blen: The burst length for this data request 582 * 583 * Called after receiving a Transfer Ready data descriptor. 584 * If the LLD is capable of sequence offload then send down the 585 * seq_blen amount of data in single frame, otherwise send 586 * multiple frames of the maximum frame payload supported by 587 * the target port. 588 */ 589static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 590 size_t offset, size_t seq_blen) 591{ 592 struct fc_exch *ep; 593 struct scsi_cmnd *sc; 594 struct scatterlist *sg; 595 struct fc_frame *fp = NULL; 596 struct fc_lport *lport = fsp->lp; 597 struct page *page; 598 size_t remaining; 599 size_t t_blen; 600 size_t tlen; 601 size_t sg_bytes; 602 size_t frame_offset, fh_parm_offset; 603 size_t off; 604 int error; 605 void *data = NULL; 606 void *page_addr; 607 int using_sg = lport->sg_supp; 608 u32 f_ctl; 609 610 WARN_ON(seq_blen <= 0); 611 if (unlikely(offset + seq_blen > fsp->data_len)) { 612 /* this should never happen */ 613 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 614 "offset %zx\n", seq_blen, offset); 615 fc_fcp_send_abort(fsp); 616 return 0; 617 } else if (offset != fsp->xfer_len) { 618 /* Out of Order Data Request - no problem, but unexpected. */ 619 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 620 "seq_blen %zx offset %zx\n", seq_blen, offset); 621 } 622 623 /* 624 * if LLD is capable of seq_offload then set transport 625 * burst length (t_blen) to seq_blen, otherwise set t_blen 626 * to max FC frame payload previously set in fsp->max_payload. 627 */ 628 t_blen = fsp->max_payload; 629 if (lport->seq_offload) { 630 t_blen = min(seq_blen, (size_t)lport->lso_max); 631 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 632 fsp, seq_blen, lport->lso_max, t_blen); 633 } 634 635 if (t_blen > 512) 636 t_blen &= ~(512 - 1); /* round down to block size */ 637 sc = fsp->cmd; 638 639 remaining = seq_blen; 640 fh_parm_offset = frame_offset = offset; 641 tlen = 0; 642 seq = fc_seq_start_next(seq); 643 f_ctl = FC_FC_REL_OFF; 644 WARN_ON(!seq); 645 646 sg = scsi_sglist(sc); 647 648 while (remaining > 0 && sg) { 649 if (offset >= sg->length) { 650 offset -= sg->length; 651 sg = sg_next(sg); 652 continue; 653 } 654 if (!fp) { 655 tlen = min(t_blen, remaining); 656 657 /* 658 * TODO. Temporary workaround. fc_seq_send() can't 659 * handle odd lengths in non-linear skbs. 660 * This will be the final fragment only. 661 */ 662 if (tlen % 4) 663 using_sg = 0; 664 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 665 if (!fp) 666 return -ENOMEM; 667 668 data = fc_frame_header_get(fp) + 1; 669 fh_parm_offset = frame_offset; 670 fr_max_payload(fp) = fsp->max_payload; 671 } 672 673 off = offset + sg->offset; 674 sg_bytes = min(tlen, sg->length - offset); 675 sg_bytes = min(sg_bytes, 676 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 677 page = sg_page(sg) + (off >> PAGE_SHIFT); 678 if (using_sg) { 679 get_page(page); 680 skb_fill_page_desc(fp_skb(fp), 681 skb_shinfo(fp_skb(fp))->nr_frags, 682 page, off & ~PAGE_MASK, sg_bytes); 683 fp_skb(fp)->data_len += sg_bytes; 684 fr_len(fp) += sg_bytes; 685 fp_skb(fp)->truesize += PAGE_SIZE; 686 } else { 687 /* 688 * The scatterlist item may be bigger than PAGE_SIZE, 689 * but we must not cross pages inside the kmap. 690 */ 691 page_addr = kmap_atomic(page); 692 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 693 sg_bytes); 694 kunmap_atomic(page_addr); 695 data += sg_bytes; 696 } 697 offset += sg_bytes; 698 frame_offset += sg_bytes; 699 tlen -= sg_bytes; 700 remaining -= sg_bytes; 701 702 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 703 (tlen)) 704 continue; 705 706 /* 707 * Send sequence with transfer sequence initiative in case 708 * this is last FCP frame of the sequence. 709 */ 710 if (remaining == 0) 711 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 712 713 ep = fc_seq_exch(seq); 714 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 715 FC_TYPE_FCP, f_ctl, fh_parm_offset); 716 717 /* 718 * send fragment using for a sequence. 719 */ 720 error = fc_seq_send(lport, seq, fp); 721 if (error) { 722 WARN_ON(1); /* send error should be rare */ 723 return error; 724 } 725 fp = NULL; 726 } 727 fsp->xfer_len += seq_blen; /* premature count? */ 728 return 0; 729} 730 731/** 732 * fc_fcp_abts_resp() - Receive an ABTS response 733 * @fsp: The FCP packet that is being aborted 734 * @fp: The response frame 735 */ 736static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 737{ 738 int ba_done = 1; 739 struct fc_ba_rjt *brp; 740 struct fc_frame_header *fh; 741 742 fh = fc_frame_header_get(fp); 743 switch (fh->fh_r_ctl) { 744 case FC_RCTL_BA_ACC: 745 break; 746 case FC_RCTL_BA_RJT: 747 brp = fc_frame_payload_get(fp, sizeof(*brp)); 748 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 749 break; 750 fallthrough; 751 default: 752 /* 753 * we will let the command timeout 754 * and scsi-ml recover in this case, 755 * therefore cleared the ba_done flag. 756 */ 757 ba_done = 0; 758 } 759 760 if (ba_done) 761 fc_fcp_abort_done(fsp); 762} 763 764/** 765 * fc_fcp_recv() - Receive an FCP frame 766 * @seq: The sequence the frame is on 767 * @fp: The received frame 768 * @arg: The related FCP packet 769 * 770 * Context: Called from Soft IRQ context. Can not be called 771 * holding the FCP packet list lock. 772 */ 773static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 774{ 775 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 776 struct fc_lport *lport = fsp->lp; 777 struct fc_frame_header *fh; 778 struct fcp_txrdy *dd; 779 u8 r_ctl; 780 int rc = 0; 781 782 if (IS_ERR(fp)) { 783 fc_fcp_error(fsp, fp); 784 return; 785 } 786 787 fh = fc_frame_header_get(fp); 788 r_ctl = fh->fh_r_ctl; 789 790 if (lport->state != LPORT_ST_READY) { 791 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n", 792 lport->state, r_ctl); 793 goto out; 794 } 795 if (fc_fcp_lock_pkt(fsp)) 796 goto out; 797 798 if (fh->fh_type == FC_TYPE_BLS) { 799 fc_fcp_abts_resp(fsp, fp); 800 goto unlock; 801 } 802 803 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) { 804 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl); 805 goto unlock; 806 } 807 808 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 809 /* 810 * received XFER RDY from the target 811 * need to send data to the target 812 */ 813 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 814 dd = fc_frame_payload_get(fp, sizeof(*dd)); 815 WARN_ON(!dd); 816 817 rc = fc_fcp_send_data(fsp, seq, 818 (size_t) ntohl(dd->ft_data_ro), 819 (size_t) ntohl(dd->ft_burst_len)); 820 if (!rc) 821 seq->rec_data = fsp->xfer_len; 822 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 823 /* 824 * received a DATA frame 825 * next we will copy the data to the system buffer 826 */ 827 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 828 fc_fcp_recv_data(fsp, fp); 829 seq->rec_data = fsp->xfer_contig_end; 830 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 831 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 832 833 fc_fcp_resp(fsp, fp); 834 } else { 835 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 836 } 837unlock: 838 fc_fcp_unlock_pkt(fsp); 839out: 840 fc_frame_free(fp); 841} 842 843/** 844 * fc_fcp_resp() - Handler for FCP responses 845 * @fsp: The FCP packet the response is for 846 * @fp: The response frame 847 */ 848static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 849{ 850 struct fc_frame_header *fh; 851 struct fcp_resp *fc_rp; 852 struct fcp_resp_ext *rp_ex; 853 struct fcp_resp_rsp_info *fc_rp_info; 854 u32 plen; 855 u32 expected_len; 856 u32 respl = 0; 857 u32 snsl = 0; 858 u8 flags = 0; 859 860 plen = fr_len(fp); 861 fh = (struct fc_frame_header *)fr_hdr(fp); 862 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 863 goto len_err; 864 plen -= sizeof(*fh); 865 fc_rp = (struct fcp_resp *)(fh + 1); 866 fsp->cdb_status = fc_rp->fr_status; 867 flags = fc_rp->fr_flags; 868 fsp->scsi_comp_flags = flags; 869 expected_len = fsp->data_len; 870 871 /* if ddp, update xfer len */ 872 fc_fcp_ddp_done(fsp); 873 874 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 875 rp_ex = (void *)(fc_rp + 1); 876 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 877 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 878 goto len_err; 879 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 880 if (flags & FCP_RSP_LEN_VAL) { 881 respl = ntohl(rp_ex->fr_rsp_len); 882 if ((respl != FCP_RESP_RSP_INFO_LEN4) && 883 (respl != FCP_RESP_RSP_INFO_LEN8)) 884 goto len_err; 885 if (fsp->wait_for_comp) { 886 /* Abuse cdb_status for rsp code */ 887 fsp->cdb_status = fc_rp_info->rsp_code; 888 complete(&fsp->tm_done); 889 /* 890 * tmfs will not have any scsi cmd so 891 * exit here 892 */ 893 return; 894 } 895 } 896 if (flags & FCP_SNS_LEN_VAL) { 897 snsl = ntohl(rp_ex->fr_sns_len); 898 if (snsl > SCSI_SENSE_BUFFERSIZE) 899 snsl = SCSI_SENSE_BUFFERSIZE; 900 memcpy(fsp->cmd->sense_buffer, 901 (char *)fc_rp_info + respl, snsl); 902 } 903 } 904 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 905 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 906 goto len_err; 907 if (flags & FCP_RESID_UNDER) { 908 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 909 /* 910 * The cmnd->underflow is the minimum number of 911 * bytes that must be transferred for this 912 * command. Provided a sense condition is not 913 * present, make sure the actual amount 914 * transferred is at least the underflow value 915 * or fail. 916 */ 917 if (!(flags & FCP_SNS_LEN_VAL) && 918 (fc_rp->fr_status == 0) && 919 (scsi_bufflen(fsp->cmd) - 920 fsp->scsi_resid) < fsp->cmd->underflow) 921 goto err; 922 expected_len -= fsp->scsi_resid; 923 } else { 924 fsp->status_code = FC_ERROR; 925 } 926 } 927 } 928 fsp->state |= FC_SRB_RCV_STATUS; 929 930 /* 931 * Check for missing or extra data frames. 932 */ 933 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && 934 fsp->xfer_len != expected_len)) { 935 if (fsp->xfer_len < expected_len) { 936 /* 937 * Some data may be queued locally, 938 * Wait a at least one jiffy to see if it is delivered. 939 * If this expires without data, we may do SRR. 940 */ 941 if (fsp->lp->qfull) { 942 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n", 943 fsp->rport->port_id); 944 return; 945 } 946 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun " 947 "len %x, data len %x\n", 948 fsp->rport->port_id, 949 fsp->xfer_len, expected_len, fsp->data_len); 950 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 951 return; 952 } 953 fsp->status_code = FC_DATA_OVRRUN; 954 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 955 "len %x, data len %x\n", 956 fsp->rport->port_id, 957 fsp->xfer_len, expected_len, fsp->data_len); 958 } 959 fc_fcp_complete_locked(fsp); 960 return; 961 962len_err: 963 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 964 "snsl %u\n", flags, fr_len(fp), respl, snsl); 965err: 966 fsp->status_code = FC_ERROR; 967 fc_fcp_complete_locked(fsp); 968} 969 970/** 971 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 972 * fcp_pkt lock held 973 * @fsp: The FCP packet to be completed 974 * 975 * This function may sleep if a timer is pending. The packet lock must be 976 * held, and the host lock must not be held. 977 */ 978static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 979{ 980 struct fc_lport *lport = fsp->lp; 981 struct fc_seq *seq; 982 struct fc_exch *ep; 983 u32 f_ctl; 984 985 if (fsp->state & FC_SRB_ABORT_PENDING) 986 return; 987 988 if (fsp->state & FC_SRB_ABORTED) { 989 if (!fsp->status_code) 990 fsp->status_code = FC_CMD_ABORTED; 991 } else { 992 /* 993 * Test for transport underrun, independent of response 994 * underrun status. 995 */ 996 if (fsp->cdb_status == SAM_STAT_GOOD && 997 fsp->xfer_len < fsp->data_len && !fsp->io_status && 998 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 999 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 1000 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n", 1001 fsp->xfer_len, fsp->data_len); 1002 fsp->status_code = FC_DATA_UNDRUN; 1003 } 1004 } 1005 1006 seq = fsp->seq_ptr; 1007 if (seq) { 1008 fsp->seq_ptr = NULL; 1009 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 1010 struct fc_frame *conf_frame; 1011 struct fc_seq *csp; 1012 1013 csp = fc_seq_start_next(seq); 1014 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 1015 if (conf_frame) { 1016 f_ctl = FC_FC_SEQ_INIT; 1017 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 1018 ep = fc_seq_exch(seq); 1019 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 1020 ep->did, ep->sid, 1021 FC_TYPE_FCP, f_ctl, 0); 1022 fc_seq_send(lport, csp, conf_frame); 1023 } 1024 } 1025 fc_exch_done(seq); 1026 } 1027 /* 1028 * Some resets driven by SCSI are not I/Os and do not have 1029 * SCSI commands associated with the requests. We should not 1030 * call I/O completion if we do not have a SCSI command. 1031 */ 1032 if (fsp->cmd) 1033 fc_io_compl(fsp); 1034} 1035 1036/** 1037 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 1038 * @fsp: The FCP packet whose exchanges should be canceled 1039 * @error: The reason for the cancellation 1040 */ 1041static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 1042{ 1043 if (fsp->seq_ptr) { 1044 fc_exch_done(fsp->seq_ptr); 1045 fsp->seq_ptr = NULL; 1046 } 1047 fsp->status_code = error; 1048} 1049 1050/** 1051 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1052 * @lport: The local port whose exchanges should be canceled 1053 * @id: The target's ID 1054 * @lun: The LUN 1055 * @error: The reason for cancellation 1056 * 1057 * If lun or id is -1, they are ignored. 1058 */ 1059static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1060 unsigned int lun, int error) 1061{ 1062 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1063 struct fc_fcp_pkt *fsp; 1064 struct scsi_cmnd *sc_cmd; 1065 unsigned long flags; 1066 1067 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1068restart: 1069 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1070 sc_cmd = fsp->cmd; 1071 if (id != -1 && scmd_id(sc_cmd) != id) 1072 continue; 1073 1074 if (lun != -1 && sc_cmd->device->lun != lun) 1075 continue; 1076 1077 fc_fcp_pkt_hold(fsp); 1078 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1079 1080 spin_lock_bh(&fsp->scsi_pkt_lock); 1081 if (!(fsp->state & FC_SRB_COMPL)) { 1082 fsp->state |= FC_SRB_COMPL; 1083 /* 1084 * TODO: dropping scsi_pkt_lock and then reacquiring 1085 * again around fc_fcp_cleanup_cmd() is required, 1086 * since fc_fcp_cleanup_cmd() calls into 1087 * fc_seq_set_resp() and that func preempts cpu using 1088 * schedule. May be schedule and related code should be 1089 * removed instead of unlocking here to avoid scheduling 1090 * while atomic bug. 1091 */ 1092 spin_unlock_bh(&fsp->scsi_pkt_lock); 1093 1094 fc_fcp_cleanup_cmd(fsp, error); 1095 1096 spin_lock_bh(&fsp->scsi_pkt_lock); 1097 fc_io_compl(fsp); 1098 } 1099 spin_unlock_bh(&fsp->scsi_pkt_lock); 1100 1101 fc_fcp_pkt_release(fsp); 1102 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1103 /* 1104 * while we dropped the lock multiple pkts could 1105 * have been released, so we have to start over. 1106 */ 1107 goto restart; 1108 } 1109 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1110} 1111 1112/** 1113 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1114 * @lport: The local port whose exchanges are to be aborted 1115 */ 1116static void fc_fcp_abort_io(struct fc_lport *lport) 1117{ 1118 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1119} 1120 1121/** 1122 * fc_fcp_pkt_send() - Send a fcp_pkt 1123 * @lport: The local port to send the FCP packet on 1124 * @fsp: The FCP packet to send 1125 * 1126 * Return: Zero for success and -1 for failure 1127 * Locks: Called without locks held 1128 */ 1129static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1130{ 1131 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1132 unsigned long flags; 1133 int rc; 1134 1135 libfc_priv(fsp->cmd)->fsp = fsp; 1136 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1137 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1138 1139 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1140 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1141 1142 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1143 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1144 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1145 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1146 if (unlikely(rc)) { 1147 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1148 libfc_priv(fsp->cmd)->fsp = NULL; 1149 list_del(&fsp->list); 1150 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1151 } 1152 1153 return rc; 1154} 1155 1156/** 1157 * fc_fcp_cmd_send() - Send a FCP command 1158 * @lport: The local port to send the command on 1159 * @fsp: The FCP packet the command is on 1160 * @resp: The handler for the response 1161 */ 1162static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1163 void (*resp)(struct fc_seq *, 1164 struct fc_frame *fp, 1165 void *arg)) 1166{ 1167 struct fc_frame *fp; 1168 struct fc_seq *seq; 1169 struct fc_rport *rport; 1170 struct fc_rport_libfc_priv *rpriv; 1171 const size_t len = sizeof(fsp->cdb_cmd); 1172 int rc = 0; 1173 1174 if (fc_fcp_lock_pkt(fsp)) 1175 return 0; 1176 1177 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1178 if (!fp) { 1179 rc = -1; 1180 goto unlock; 1181 } 1182 1183 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1184 fr_fsp(fp) = fsp; 1185 rport = fsp->rport; 1186 fsp->max_payload = rport->maxframe_size; 1187 rpriv = rport->dd_data; 1188 1189 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1190 rpriv->local_port->port_id, FC_TYPE_FCP, 1191 FC_FCTL_REQ, 0); 1192 1193 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0); 1194 if (!seq) { 1195 rc = -1; 1196 goto unlock; 1197 } 1198 fsp->seq_ptr = seq; 1199 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1200 1201 fsp->timer.function = fc_fcp_timeout; 1202 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1203 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1204 1205unlock: 1206 fc_fcp_unlock_pkt(fsp); 1207 return rc; 1208} 1209 1210/** 1211 * fc_fcp_error() - Handler for FCP layer errors 1212 * @fsp: The FCP packet the error is on 1213 * @fp: The frame that has errored 1214 */ 1215static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1216{ 1217 int error = PTR_ERR(fp); 1218 1219 if (fc_fcp_lock_pkt(fsp)) 1220 return; 1221 1222 if (error == -FC_EX_CLOSED) { 1223 fc_fcp_retry_cmd(fsp, FC_ERROR); 1224 goto unlock; 1225 } 1226 1227 /* 1228 * clear abort pending, because the lower layer 1229 * decided to force completion. 1230 */ 1231 fsp->state &= ~FC_SRB_ABORT_PENDING; 1232 fsp->status_code = FC_CMD_PLOGO; 1233 fc_fcp_complete_locked(fsp); 1234unlock: 1235 fc_fcp_unlock_pkt(fsp); 1236} 1237 1238/** 1239 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1240 * @fsp: The FCP packet to abort on 1241 * 1242 * Called to send an abort and then wait for abort completion 1243 */ 1244static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1245{ 1246 int rc = FAILED; 1247 unsigned long ticks_left; 1248 1249 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state); 1250 if (fc_fcp_send_abort(fsp)) { 1251 FC_FCP_DBG(fsp, "failed to send abort\n"); 1252 return FAILED; 1253 } 1254 1255 if (fsp->state & FC_SRB_ABORTED) { 1256 FC_FCP_DBG(fsp, "target abort cmd completed\n"); 1257 return SUCCESS; 1258 } 1259 1260 init_completion(&fsp->tm_done); 1261 fsp->wait_for_comp = 1; 1262 1263 spin_unlock_bh(&fsp->scsi_pkt_lock); 1264 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1265 FC_SCSI_TM_TOV); 1266 spin_lock_bh(&fsp->scsi_pkt_lock); 1267 fsp->wait_for_comp = 0; 1268 1269 if (!ticks_left) { 1270 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1271 } else if (fsp->state & FC_SRB_ABORTED) { 1272 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1273 rc = SUCCESS; 1274 fc_fcp_complete_locked(fsp); 1275 } 1276 1277 return rc; 1278} 1279 1280/** 1281 * fc_lun_reset_send() - Send LUN reset command 1282 * @t: Timer context used to fetch the FSP packet 1283 */ 1284static void fc_lun_reset_send(struct timer_list *t) 1285{ 1286 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); 1287 struct fc_lport *lport = fsp->lp; 1288 1289 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1290 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1291 return; 1292 if (fc_fcp_lock_pkt(fsp)) 1293 return; 1294 fsp->timer.function = fc_lun_reset_send; 1295 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1296 fc_fcp_unlock_pkt(fsp); 1297 } 1298} 1299 1300/** 1301 * fc_lun_reset() - Send a LUN RESET command to a device 1302 * and wait for the reply 1303 * @lport: The local port to sent the command on 1304 * @fsp: The FCP packet that identifies the LUN to be reset 1305 * @id: The SCSI command ID 1306 * @lun: The LUN ID to be reset 1307 */ 1308static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1309 unsigned int id, unsigned int lun) 1310{ 1311 int rc; 1312 1313 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1314 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1315 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1316 1317 fsp->wait_for_comp = 1; 1318 init_completion(&fsp->tm_done); 1319 1320 fc_lun_reset_send(&fsp->timer); 1321 1322 /* 1323 * wait for completion of reset 1324 * after that make sure all commands are terminated 1325 */ 1326 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1327 1328 spin_lock_bh(&fsp->scsi_pkt_lock); 1329 fsp->state |= FC_SRB_COMPL; 1330 spin_unlock_bh(&fsp->scsi_pkt_lock); 1331 1332 del_timer_sync(&fsp->timer); 1333 1334 spin_lock_bh(&fsp->scsi_pkt_lock); 1335 if (fsp->seq_ptr) { 1336 fc_exch_done(fsp->seq_ptr); 1337 fsp->seq_ptr = NULL; 1338 } 1339 fsp->wait_for_comp = 0; 1340 spin_unlock_bh(&fsp->scsi_pkt_lock); 1341 1342 if (!rc) { 1343 FC_SCSI_DBG(lport, "lun reset failed\n"); 1344 return FAILED; 1345 } 1346 1347 /* cdb_status holds the tmf's rsp code */ 1348 if (fsp->cdb_status != FCP_TMF_CMPL) 1349 return FAILED; 1350 1351 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1352 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1353 return SUCCESS; 1354} 1355 1356/** 1357 * fc_tm_done() - Task Management response handler 1358 * @seq: The sequence that the response is on 1359 * @fp: The response frame 1360 * @arg: The FCP packet the response is for 1361 */ 1362static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1363{ 1364 struct fc_fcp_pkt *fsp = arg; 1365 struct fc_frame_header *fh; 1366 1367 if (IS_ERR(fp)) { 1368 /* 1369 * If there is an error just let it timeout or wait 1370 * for TMF to be aborted if it timedout. 1371 * 1372 * scsi-eh will escalate for when either happens. 1373 */ 1374 return; 1375 } 1376 1377 if (fc_fcp_lock_pkt(fsp)) 1378 goto out; 1379 1380 /* 1381 * raced with eh timeout handler. 1382 */ 1383 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1384 goto out_unlock; 1385 1386 fh = fc_frame_header_get(fp); 1387 if (fh->fh_type != FC_TYPE_BLS) 1388 fc_fcp_resp(fsp, fp); 1389 fsp->seq_ptr = NULL; 1390 fc_exch_done(seq); 1391out_unlock: 1392 fc_fcp_unlock_pkt(fsp); 1393out: 1394 fc_frame_free(fp); 1395} 1396 1397/** 1398 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1399 * @lport: The local port to be cleaned up 1400 */ 1401static void fc_fcp_cleanup(struct fc_lport *lport) 1402{ 1403 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1404} 1405 1406/** 1407 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1408 * @t: Timer context used to fetch the FSP packet 1409 * 1410 * If REC is supported then just issue it and return. The REC exchange will 1411 * complete or time out and recovery can continue at that point. Otherwise, 1412 * if the response has been received without all the data it has been 1413 * ER_TIMEOUT since the response was received. If the response has not been 1414 * received we see if data was received recently. If it has been then we 1415 * continue waiting, otherwise, we abort the command. 1416 */ 1417static void fc_fcp_timeout(struct timer_list *t) 1418{ 1419 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); 1420 struct fc_rport *rport = fsp->rport; 1421 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1422 1423 if (fc_fcp_lock_pkt(fsp)) 1424 return; 1425 1426 if (fsp->cdb_cmd.fc_tm_flags) 1427 goto unlock; 1428 1429 if (fsp->lp->qfull) { 1430 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n", 1431 fsp->timer_delay); 1432 fsp->timer.function = fc_fcp_timeout; 1433 fc_fcp_timer_set(fsp, fsp->timer_delay); 1434 goto unlock; 1435 } 1436 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n", 1437 fsp->timer_delay, rpriv->flags, fsp->state); 1438 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1439 1440 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1441 fc_fcp_rec(fsp); 1442 else if (fsp->state & FC_SRB_RCV_STATUS) 1443 fc_fcp_complete_locked(fsp); 1444 else 1445 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1446 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1447unlock: 1448 fc_fcp_unlock_pkt(fsp); 1449} 1450 1451/** 1452 * fc_fcp_rec() - Send a REC ELS request 1453 * @fsp: The FCP packet to send the REC request on 1454 */ 1455static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1456{ 1457 struct fc_lport *lport; 1458 struct fc_frame *fp; 1459 struct fc_rport *rport; 1460 struct fc_rport_libfc_priv *rpriv; 1461 1462 lport = fsp->lp; 1463 rport = fsp->rport; 1464 rpriv = rport->dd_data; 1465 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1466 fsp->status_code = FC_HRD_ERROR; 1467 fsp->io_status = 0; 1468 fc_fcp_complete_locked(fsp); 1469 return; 1470 } 1471 1472 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1473 if (!fp) 1474 goto retry; 1475 1476 fr_seq(fp) = fsp->seq_ptr; 1477 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1478 rpriv->local_port->port_id, FC_TYPE_ELS, 1479 FC_FCTL_REQ, 0); 1480 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1481 fc_fcp_rec_resp, fsp, 1482 2 * lport->r_a_tov)) { 1483 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1484 return; 1485 } 1486retry: 1487 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1488 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1489 else 1490 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1491} 1492 1493/** 1494 * fc_fcp_rec_resp() - Handler for REC ELS responses 1495 * @seq: The sequence the response is on 1496 * @fp: The response frame 1497 * @arg: The FCP packet the response is on 1498 * 1499 * If the response is a reject then the scsi layer will handle 1500 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1501 * set the timeout and return. If the I/O was completed then complete the 1502 * exchange and tell the SCSI layer. 1503 */ 1504static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1505{ 1506 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1507 struct fc_els_rec_acc *recp; 1508 struct fc_els_ls_rjt *rjt; 1509 u32 e_stat; 1510 u8 opcode; 1511 u32 offset; 1512 enum dma_data_direction data_dir; 1513 enum fc_rctl r_ctl; 1514 struct fc_rport_libfc_priv *rpriv; 1515 1516 if (IS_ERR(fp)) { 1517 fc_fcp_rec_error(fsp, fp); 1518 return; 1519 } 1520 1521 if (fc_fcp_lock_pkt(fsp)) 1522 goto out; 1523 1524 fsp->recov_retry = 0; 1525 opcode = fc_frame_payload_op(fp); 1526 if (opcode == ELS_LS_RJT) { 1527 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1528 switch (rjt->er_reason) { 1529 default: 1530 FC_FCP_DBG(fsp, 1531 "device %x invalid REC reject %d/%d\n", 1532 fsp->rport->port_id, rjt->er_reason, 1533 rjt->er_explan); 1534 fallthrough; 1535 case ELS_RJT_UNSUP: 1536 FC_FCP_DBG(fsp, "device does not support REC\n"); 1537 rpriv = fsp->rport->dd_data; 1538 /* 1539 * if we do not spport RECs or got some bogus 1540 * reason then resetup timer so we check for 1541 * making progress. 1542 */ 1543 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1544 break; 1545 case ELS_RJT_LOGIC: 1546 case ELS_RJT_UNAB: 1547 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n", 1548 fsp->rport->port_id, rjt->er_reason, 1549 rjt->er_explan); 1550 /* 1551 * If response got lost or is stuck in the 1552 * queue somewhere we have no idea if and when 1553 * the response will be received. So quarantine 1554 * the xid and retry the command. 1555 */ 1556 if (rjt->er_explan == ELS_EXPL_OXID_RXID) { 1557 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1558 ep->state |= FC_EX_QUARANTINE; 1559 fsp->state |= FC_SRB_ABORTED; 1560 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1561 break; 1562 } 1563 fc_fcp_recovery(fsp, FC_TRANS_RESET); 1564 break; 1565 } 1566 } else if (opcode == ELS_LS_ACC) { 1567 if (fsp->state & FC_SRB_ABORTED) 1568 goto unlock_out; 1569 1570 data_dir = fsp->cmd->sc_data_direction; 1571 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1572 offset = ntohl(recp->reca_fc4value); 1573 e_stat = ntohl(recp->reca_e_stat); 1574 1575 if (e_stat & ESB_ST_COMPLETE) { 1576 1577 /* 1578 * The exchange is complete. 1579 * 1580 * For output, we must've lost the response. 1581 * For input, all data must've been sent. 1582 * We lost may have lost the response 1583 * (and a confirmation was requested) and maybe 1584 * some data. 1585 * 1586 * If all data received, send SRR 1587 * asking for response. If partial data received, 1588 * or gaps, SRR requests data at start of gap. 1589 * Recovery via SRR relies on in-order-delivery. 1590 */ 1591 if (data_dir == DMA_TO_DEVICE) { 1592 r_ctl = FC_RCTL_DD_CMD_STATUS; 1593 } else if (fsp->xfer_contig_end == offset) { 1594 r_ctl = FC_RCTL_DD_CMD_STATUS; 1595 } else { 1596 offset = fsp->xfer_contig_end; 1597 r_ctl = FC_RCTL_DD_SOL_DATA; 1598 } 1599 fc_fcp_srr(fsp, r_ctl, offset); 1600 } else if (e_stat & ESB_ST_SEQ_INIT) { 1601 /* 1602 * The remote port has the initiative, so just 1603 * keep waiting for it to complete. 1604 */ 1605 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1606 } else { 1607 1608 /* 1609 * The exchange is incomplete, we have seq. initiative. 1610 * Lost response with requested confirmation, 1611 * lost confirmation, lost transfer ready or 1612 * lost write data. 1613 * 1614 * For output, if not all data was received, ask 1615 * for transfer ready to be repeated. 1616 * 1617 * If we received or sent all the data, send SRR to 1618 * request response. 1619 * 1620 * If we lost a response, we may have lost some read 1621 * data as well. 1622 */ 1623 r_ctl = FC_RCTL_DD_SOL_DATA; 1624 if (data_dir == DMA_TO_DEVICE) { 1625 r_ctl = FC_RCTL_DD_CMD_STATUS; 1626 if (offset < fsp->data_len) 1627 r_ctl = FC_RCTL_DD_DATA_DESC; 1628 } else if (offset == fsp->xfer_contig_end) { 1629 r_ctl = FC_RCTL_DD_CMD_STATUS; 1630 } else if (fsp->xfer_contig_end < offset) { 1631 offset = fsp->xfer_contig_end; 1632 } 1633 fc_fcp_srr(fsp, r_ctl, offset); 1634 } 1635 } 1636unlock_out: 1637 fc_fcp_unlock_pkt(fsp); 1638out: 1639 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1640 fc_frame_free(fp); 1641} 1642 1643/** 1644 * fc_fcp_rec_error() - Handler for REC errors 1645 * @fsp: The FCP packet the error is on 1646 * @fp: The REC frame 1647 */ 1648static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1649{ 1650 int error = PTR_ERR(fp); 1651 1652 if (fc_fcp_lock_pkt(fsp)) 1653 goto out; 1654 1655 switch (error) { 1656 case -FC_EX_CLOSED: 1657 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n", 1658 fsp, fsp->rport->port_id); 1659 fc_fcp_retry_cmd(fsp, FC_ERROR); 1660 break; 1661 1662 default: 1663 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1664 fsp, fsp->rport->port_id, error); 1665 fsp->status_code = FC_CMD_PLOGO; 1666 fallthrough; 1667 1668 case -FC_EX_TIMEOUT: 1669 /* 1670 * Assume REC or LS_ACC was lost. 1671 * The exchange manager will have aborted REC, so retry. 1672 */ 1673 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n", 1674 fsp, fsp->rport->port_id, fsp->recov_retry, 1675 FC_MAX_RECOV_RETRY); 1676 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1677 fc_fcp_rec(fsp); 1678 else 1679 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1680 break; 1681 } 1682 fc_fcp_unlock_pkt(fsp); 1683out: 1684 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1685} 1686 1687/** 1688 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1689 * @fsp: The FCP pkt that needs to be aborted 1690 * @code: The FCP status code to set 1691 */ 1692static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1693{ 1694 FC_FCP_DBG(fsp, "start recovery code %x\n", code); 1695 fsp->status_code = code; 1696 fsp->cdb_status = 0; 1697 fsp->io_status = 0; 1698 if (!fsp->cmd) 1699 /* 1700 * Only abort non-scsi commands; otherwise let the 1701 * scsi command timer fire and scsi-ml escalate. 1702 */ 1703 fc_fcp_send_abort(fsp); 1704} 1705 1706/** 1707 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1708 * @fsp: The FCP packet the SRR is to be sent on 1709 * @r_ctl: The R_CTL field for the SRR request 1710 * @offset: The SRR relative offset 1711 * This is called after receiving status but insufficient data, or 1712 * when expecting status but the request has timed out. 1713 */ 1714static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1715{ 1716 struct fc_lport *lport = fsp->lp; 1717 struct fc_rport *rport; 1718 struct fc_rport_libfc_priv *rpriv; 1719 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1720 struct fc_seq *seq; 1721 struct fcp_srr *srr; 1722 struct fc_frame *fp; 1723 1724 rport = fsp->rport; 1725 rpriv = rport->dd_data; 1726 1727 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1728 rpriv->rp_state != RPORT_ST_READY) 1729 goto retry; /* shouldn't happen */ 1730 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1731 if (!fp) 1732 goto retry; 1733 1734 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1735 memset(srr, 0, sizeof(*srr)); 1736 srr->srr_op = ELS_SRR; 1737 srr->srr_ox_id = htons(ep->oxid); 1738 srr->srr_rx_id = htons(ep->rxid); 1739 srr->srr_r_ctl = r_ctl; 1740 srr->srr_rel_off = htonl(offset); 1741 1742 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1743 rpriv->local_port->port_id, FC_TYPE_FCP, 1744 FC_FCTL_REQ, 0); 1745 1746 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp, 1747 fc_fcp_pkt_destroy, 1748 fsp, get_fsp_rec_tov(fsp)); 1749 if (!seq) 1750 goto retry; 1751 1752 fsp->recov_seq = seq; 1753 fsp->xfer_len = offset; 1754 fsp->xfer_contig_end = offset; 1755 fsp->state &= ~FC_SRB_RCV_STATUS; 1756 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1757 return; 1758retry: 1759 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1760} 1761 1762/** 1763 * fc_fcp_srr_resp() - Handler for SRR response 1764 * @seq: The sequence the SRR is on 1765 * @fp: The SRR frame 1766 * @arg: The FCP packet the SRR is on 1767 */ 1768static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1769{ 1770 struct fc_fcp_pkt *fsp = arg; 1771 struct fc_frame_header *fh; 1772 1773 if (IS_ERR(fp)) { 1774 fc_fcp_srr_error(fsp, fp); 1775 return; 1776 } 1777 1778 if (fc_fcp_lock_pkt(fsp)) 1779 goto out; 1780 1781 fh = fc_frame_header_get(fp); 1782 /* 1783 * BUG? fc_fcp_srr_error calls fc_exch_done which would release 1784 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1785 * then fc_exch_timeout would be sending an abort. The fc_exch_done 1786 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1787 * an abort response though. 1788 */ 1789 if (fh->fh_type == FC_TYPE_BLS) { 1790 fc_fcp_unlock_pkt(fsp); 1791 return; 1792 } 1793 1794 switch (fc_frame_payload_op(fp)) { 1795 case ELS_LS_ACC: 1796 fsp->recov_retry = 0; 1797 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1798 break; 1799 case ELS_LS_RJT: 1800 default: 1801 fc_fcp_recovery(fsp, FC_ERROR); 1802 break; 1803 } 1804 fc_fcp_unlock_pkt(fsp); 1805out: 1806 fc_exch_done(seq); 1807 fc_frame_free(fp); 1808} 1809 1810/** 1811 * fc_fcp_srr_error() - Handler for SRR errors 1812 * @fsp: The FCP packet that the SRR error is on 1813 * @fp: The SRR frame 1814 */ 1815static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1816{ 1817 if (fc_fcp_lock_pkt(fsp)) 1818 goto out; 1819 switch (PTR_ERR(fp)) { 1820 case -FC_EX_TIMEOUT: 1821 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry); 1822 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1823 fc_fcp_rec(fsp); 1824 else 1825 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1826 break; 1827 case -FC_EX_CLOSED: /* e.g., link failure */ 1828 FC_FCP_DBG(fsp, "SRR error, exchange closed\n"); 1829 fallthrough; 1830 default: 1831 fc_fcp_retry_cmd(fsp, FC_ERROR); 1832 break; 1833 } 1834 fc_fcp_unlock_pkt(fsp); 1835out: 1836 fc_exch_done(fsp->recov_seq); 1837} 1838 1839/** 1840 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1841 * @lport: The local port to be checked 1842 */ 1843static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1844{ 1845 /* lock ? */ 1846 return (lport->state == LPORT_ST_READY) && 1847 lport->link_up && !lport->qfull; 1848} 1849 1850/** 1851 * fc_queuecommand() - The queuecommand function of the SCSI template 1852 * @shost: The Scsi_Host that the command was issued to 1853 * @sc_cmd: The scsi_cmnd to be executed 1854 * 1855 * This is the i/o strategy routine, called by the SCSI layer. 1856 */ 1857int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1858{ 1859 struct fc_lport *lport = shost_priv(shost); 1860 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1861 struct fc_fcp_pkt *fsp; 1862 int rval; 1863 int rc = 0; 1864 1865 rval = fc_remote_port_chkready(rport); 1866 if (rval) { 1867 sc_cmd->result = rval; 1868 scsi_done(sc_cmd); 1869 return 0; 1870 } 1871 1872 if (!*(struct fc_remote_port **)rport->dd_data) { 1873 /* 1874 * rport is transitioning from blocked/deleted to 1875 * online 1876 */ 1877 sc_cmd->result = DID_IMM_RETRY << 16; 1878 scsi_done(sc_cmd); 1879 goto out; 1880 } 1881 1882 if (!fc_fcp_lport_queue_ready(lport)) { 1883 if (lport->qfull) { 1884 if (fc_fcp_can_queue_ramp_down(lport)) 1885 shost_printk(KERN_ERR, lport->host, 1886 "libfc: queue full, " 1887 "reducing can_queue to %d.\n", 1888 lport->host->can_queue); 1889 } 1890 rc = SCSI_MLQUEUE_HOST_BUSY; 1891 goto out; 1892 } 1893 1894 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1895 if (fsp == NULL) { 1896 rc = SCSI_MLQUEUE_HOST_BUSY; 1897 goto out; 1898 } 1899 1900 /* 1901 * build the libfc request pkt 1902 */ 1903 fsp->cmd = sc_cmd; /* save the cmd */ 1904 fsp->rport = rport; /* set the remote port ptr */ 1905 1906 /* 1907 * set up the transfer length 1908 */ 1909 fsp->data_len = scsi_bufflen(sc_cmd); 1910 fsp->xfer_len = 0; 1911 1912 /* 1913 * setup the data direction 1914 */ 1915 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1916 fsp->req_flags = FC_SRB_READ; 1917 this_cpu_inc(lport->stats->InputRequests); 1918 this_cpu_add(lport->stats->InputBytes, fsp->data_len); 1919 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1920 fsp->req_flags = FC_SRB_WRITE; 1921 this_cpu_inc(lport->stats->OutputRequests); 1922 this_cpu_add(lport->stats->OutputBytes, fsp->data_len); 1923 } else { 1924 fsp->req_flags = 0; 1925 this_cpu_inc(lport->stats->ControlRequests); 1926 } 1927 1928 /* 1929 * send it to the lower layer 1930 * if we get -1 return then put the request in the pending 1931 * queue. 1932 */ 1933 rval = fc_fcp_pkt_send(lport, fsp); 1934 if (rval != 0) { 1935 fsp->state = FC_SRB_FREE; 1936 fc_fcp_pkt_release(fsp); 1937 rc = SCSI_MLQUEUE_HOST_BUSY; 1938 } 1939out: 1940 return rc; 1941} 1942EXPORT_SYMBOL(fc_queuecommand); 1943 1944/** 1945 * fc_io_compl() - Handle responses for completed commands 1946 * @fsp: The FCP packet that is complete 1947 * 1948 * Translates fcp_pkt errors to a Linux SCSI errors. 1949 * The fcp packet lock must be held when calling. 1950 */ 1951static void fc_io_compl(struct fc_fcp_pkt *fsp) 1952{ 1953 struct fc_fcp_internal *si; 1954 struct scsi_cmnd *sc_cmd; 1955 struct fc_lport *lport; 1956 unsigned long flags; 1957 1958 /* release outstanding ddp context */ 1959 fc_fcp_ddp_done(fsp); 1960 1961 fsp->state |= FC_SRB_COMPL; 1962 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1963 spin_unlock_bh(&fsp->scsi_pkt_lock); 1964 del_timer_sync(&fsp->timer); 1965 spin_lock_bh(&fsp->scsi_pkt_lock); 1966 } 1967 1968 lport = fsp->lp; 1969 si = fc_get_scsi_internal(lport); 1970 1971 /* 1972 * if can_queue ramp down is done then try can_queue ramp up 1973 * since commands are completing now. 1974 */ 1975 if (si->last_can_queue_ramp_down_time) 1976 fc_fcp_can_queue_ramp_up(lport); 1977 1978 sc_cmd = fsp->cmd; 1979 libfc_priv(sc_cmd)->status = fsp->cdb_status; 1980 switch (fsp->status_code) { 1981 case FC_COMPLETE: 1982 if (fsp->cdb_status == 0) { 1983 /* 1984 * good I/O status 1985 */ 1986 sc_cmd->result = DID_OK << 16; 1987 if (fsp->scsi_resid) 1988 libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid; 1989 } else { 1990 /* 1991 * transport level I/O was ok but scsi 1992 * has non zero status 1993 */ 1994 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1995 } 1996 break; 1997 case FC_ERROR: 1998 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1999 "due to FC_ERROR\n"); 2000 sc_cmd->result = DID_ERROR << 16; 2001 break; 2002 case FC_DATA_UNDRUN: 2003 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 2004 /* 2005 * scsi status is good but transport level 2006 * underrun. 2007 */ 2008 if (fsp->state & FC_SRB_RCV_STATUS) { 2009 sc_cmd->result = DID_OK << 16; 2010 } else { 2011 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 2012 " due to FC_DATA_UNDRUN (trans)\n"); 2013 sc_cmd->result = DID_ERROR << 16; 2014 } 2015 } else { 2016 /* 2017 * scsi got underrun, this is an error 2018 */ 2019 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2020 "due to FC_DATA_UNDRUN (scsi)\n"); 2021 libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid; 2022 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2023 } 2024 break; 2025 case FC_DATA_OVRRUN: 2026 /* 2027 * overrun is an error 2028 */ 2029 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2030 "due to FC_DATA_OVRRUN\n"); 2031 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2032 break; 2033 case FC_CMD_ABORTED: 2034 if (host_byte(sc_cmd->result) == DID_TIME_OUT) 2035 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " 2036 "due to FC_CMD_ABORTED\n"); 2037 else { 2038 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2039 "due to FC_CMD_ABORTED\n"); 2040 set_host_byte(sc_cmd, DID_ERROR); 2041 } 2042 sc_cmd->result |= fsp->io_status; 2043 break; 2044 case FC_CMD_RESET: 2045 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 2046 "due to FC_CMD_RESET\n"); 2047 sc_cmd->result = (DID_RESET << 16); 2048 break; 2049 case FC_TRANS_RESET: 2050 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml " 2051 "due to FC_TRANS_RESET\n"); 2052 sc_cmd->result = (DID_SOFT_ERROR << 16); 2053 break; 2054 case FC_HRD_ERROR: 2055 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 2056 "due to FC_HRD_ERROR\n"); 2057 sc_cmd->result = (DID_NO_CONNECT << 16); 2058 break; 2059 case FC_CRC_ERROR: 2060 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 2061 "due to FC_CRC_ERROR\n"); 2062 sc_cmd->result = (DID_PARITY << 16); 2063 break; 2064 case FC_TIMED_OUT: 2065 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " 2066 "due to FC_TIMED_OUT\n"); 2067 sc_cmd->result = (DID_TIME_OUT << 16); 2068 break; 2069 default: 2070 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2071 "due to unknown error\n"); 2072 sc_cmd->result = (DID_ERROR << 16); 2073 break; 2074 } 2075 2076 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 2077 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2078 2079 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2080 list_del(&fsp->list); 2081 libfc_priv(sc_cmd)->fsp = NULL; 2082 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2083 scsi_done(sc_cmd); 2084 2085 /* release ref from initial allocation in queue command */ 2086 fc_fcp_pkt_release(fsp); 2087} 2088 2089/** 2090 * fc_eh_abort() - Abort a command 2091 * @sc_cmd: The SCSI command to abort 2092 * 2093 * From SCSI host template. 2094 * Send an ABTS to the target device and wait for the response. 2095 */ 2096int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2097{ 2098 struct fc_fcp_pkt *fsp; 2099 struct fc_lport *lport; 2100 struct fc_fcp_internal *si; 2101 int rc = FAILED; 2102 unsigned long flags; 2103 int rval; 2104 2105 rval = fc_block_scsi_eh(sc_cmd); 2106 if (rval) 2107 return rval; 2108 2109 lport = shost_priv(sc_cmd->device->host); 2110 if (lport->state != LPORT_ST_READY) 2111 return rc; 2112 else if (!lport->link_up) 2113 return rc; 2114 2115 si = fc_get_scsi_internal(lport); 2116 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2117 fsp = libfc_priv(sc_cmd)->fsp; 2118 if (!fsp) { 2119 /* command completed while scsi eh was setting up */ 2120 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2121 return SUCCESS; 2122 } 2123 /* grab a ref so the fsp and sc_cmd cannot be released from under us */ 2124 fc_fcp_pkt_hold(fsp); 2125 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2126 2127 if (fc_fcp_lock_pkt(fsp)) { 2128 /* completed while we were waiting for timer to be deleted */ 2129 rc = SUCCESS; 2130 goto release_pkt; 2131 } 2132 2133 rc = fc_fcp_pkt_abort(fsp); 2134 fc_fcp_unlock_pkt(fsp); 2135 2136release_pkt: 2137 fc_fcp_pkt_release(fsp); 2138 return rc; 2139} 2140EXPORT_SYMBOL(fc_eh_abort); 2141 2142/** 2143 * fc_eh_device_reset() - Reset a single LUN 2144 * @sc_cmd: The SCSI command which identifies the device whose 2145 * LUN is to be reset 2146 * 2147 * Set from SCSI host template. 2148 */ 2149int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2150{ 2151 struct fc_lport *lport; 2152 struct fc_fcp_pkt *fsp; 2153 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2154 int rc = FAILED; 2155 int rval; 2156 2157 rval = fc_block_scsi_eh(sc_cmd); 2158 if (rval) 2159 return rval; 2160 2161 lport = shost_priv(sc_cmd->device->host); 2162 2163 if (lport->state != LPORT_ST_READY) 2164 return rc; 2165 2166 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2167 2168 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2169 if (fsp == NULL) { 2170 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2171 goto out; 2172 } 2173 2174 /* 2175 * Build the libfc request pkt. Do not set the scsi cmnd, because 2176 * the sc passed in is not setup for execution like when sent 2177 * through the queuecommand callout. 2178 */ 2179 fsp->rport = rport; /* set the remote port ptr */ 2180 2181 /* 2182 * flush outstanding commands 2183 */ 2184 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2185 fsp->state = FC_SRB_FREE; 2186 fc_fcp_pkt_release(fsp); 2187 2188out: 2189 return rc; 2190} 2191EXPORT_SYMBOL(fc_eh_device_reset); 2192 2193/** 2194 * fc_eh_host_reset() - Reset a Scsi_Host. 2195 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2196 */ 2197int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2198{ 2199 struct Scsi_Host *shost = sc_cmd->device->host; 2200 struct fc_lport *lport = shost_priv(shost); 2201 unsigned long wait_tmo; 2202 2203 FC_SCSI_DBG(lport, "Resetting host\n"); 2204 2205 fc_lport_reset(lport); 2206 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2207 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2208 wait_tmo)) 2209 msleep(1000); 2210 2211 if (fc_fcp_lport_queue_ready(lport)) { 2212 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2213 "on port (%6.6x)\n", lport->port_id); 2214 return SUCCESS; 2215 } else { 2216 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2217 "port (%6.6x) is not ready.\n", 2218 lport->port_id); 2219 return FAILED; 2220 } 2221} 2222EXPORT_SYMBOL(fc_eh_host_reset); 2223 2224/** 2225 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2226 * @sdev: The SCSI device that identifies the SCSI host 2227 * 2228 * Configures queue depth based on host's cmd_per_len. If not set 2229 * then we use the libfc default. 2230 */ 2231int fc_slave_alloc(struct scsi_device *sdev) 2232{ 2233 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2234 2235 if (!rport || fc_remote_port_chkready(rport)) 2236 return -ENXIO; 2237 2238 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2239 return 0; 2240} 2241EXPORT_SYMBOL(fc_slave_alloc); 2242 2243/** 2244 * fc_fcp_destroy() - Tear down the FCP layer for a given local port 2245 * @lport: The local port that no longer needs the FCP layer 2246 */ 2247void fc_fcp_destroy(struct fc_lport *lport) 2248{ 2249 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2250 2251 if (!list_empty(&si->scsi_pkt_queue)) 2252 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2253 "port (%6.6x)\n", lport->port_id); 2254 2255 mempool_destroy(si->scsi_pkt_pool); 2256 kfree(si); 2257 lport->scsi_priv = NULL; 2258} 2259EXPORT_SYMBOL(fc_fcp_destroy); 2260 2261int fc_setup_fcp(void) 2262{ 2263 int rc = 0; 2264 2265 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2266 sizeof(struct fc_fcp_pkt), 2267 0, SLAB_HWCACHE_ALIGN, NULL); 2268 if (!scsi_pkt_cachep) { 2269 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2270 "module load failed!"); 2271 rc = -ENOMEM; 2272 } 2273 2274 return rc; 2275} 2276 2277void fc_destroy_fcp(void) 2278{ 2279 kmem_cache_destroy(scsi_pkt_cachep); 2280} 2281 2282/** 2283 * fc_fcp_init() - Initialize the FCP layer for a local port 2284 * @lport: The local port to initialize the exchange layer for 2285 */ 2286int fc_fcp_init(struct fc_lport *lport) 2287{ 2288 int rc; 2289 struct fc_fcp_internal *si; 2290 2291 if (!lport->tt.fcp_cmd_send) 2292 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2293 2294 if (!lport->tt.fcp_cleanup) 2295 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2296 2297 if (!lport->tt.fcp_abort_io) 2298 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2299 2300 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2301 if (!si) 2302 return -ENOMEM; 2303 lport->scsi_priv = si; 2304 si->max_can_queue = lport->host->can_queue; 2305 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2306 spin_lock_init(&si->scsi_queue_lock); 2307 2308 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2309 if (!si->scsi_pkt_pool) { 2310 rc = -ENOMEM; 2311 goto free_internal; 2312 } 2313 return 0; 2314 2315free_internal: 2316 kfree(si); 2317 return rc; 2318} 2319EXPORT_SYMBOL(fc_fcp_init); 2320