1/* 2 * Copyright(c) 2007 Intel Corporation. All rights reserved. 3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved. 4 * Copyright(c) 2008 Mike Christie 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Maintained at www.Open-FCoE.org 20 */ 21 22#include <linux/module.h> 23#include <linux/delay.h> 24#include <linux/kernel.h> 25#include <linux/types.h> 26#include <linux/spinlock.h> 27#include <linux/scatterlist.h> 28#include <linux/err.h> 29#include <linux/crc32.h> 30#include <linux/slab.h> 31 32#include <scsi/scsi_tcq.h> 33#include <scsi/scsi.h> 34#include <scsi/scsi_host.h> 35#include <scsi/scsi_device.h> 36#include <scsi/scsi_cmnd.h> 37 38#include <scsi/fc/fc_fc2.h> 39 40#include <scsi/libfc.h> 41#include <scsi/fc_encode.h> 42 43#include "fc_libfc.h" 44 45static struct kmem_cache *scsi_pkt_cachep; 46 47/* SRB state definitions */ 48#define FC_SRB_FREE 0 /* cmd is free */ 49#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 50#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 51#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 52#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ 53#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 54#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 55#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 56 57#define FC_SRB_READ (1 << 1) 58#define FC_SRB_WRITE (1 << 0) 59 60/* 61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock 62 */ 63#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 64#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 65#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 66#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 67#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 68 69/** 70 * struct fc_fcp_internal - FCP layer internal data 71 * @scsi_pkt_pool: Memory pool to draw FCP packets from 72 * @scsi_queue_lock: Protects the scsi_pkt_queue 73 * @scsi_pkt_queue: Current FCP packets 74 * @last_can_queue_ramp_down_time: ramp down time 75 * @last_can_queue_ramp_up_time: ramp up time 76 * @max_can_queue: max can_queue size 77 */ 78struct fc_fcp_internal { 79 mempool_t *scsi_pkt_pool; 80 spinlock_t scsi_queue_lock; 81 struct list_head scsi_pkt_queue; 82 unsigned long last_can_queue_ramp_down_time; 83 unsigned long last_can_queue_ramp_up_time; 84 int max_can_queue; 85}; 86 87#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 88 89/* 90 * function prototypes 91 * FC scsi I/O related functions 92 */ 93static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 94static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 95static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 96static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 97static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 98static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 99static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); 100static void fc_fcp_timeout(unsigned long); 101static void fc_fcp_rec(struct fc_fcp_pkt *); 102static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 103static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 104static void fc_io_compl(struct fc_fcp_pkt *); 105 106static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 107static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 108static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 109 110/* 111 * command status codes 112 */ 113#define FC_COMPLETE 0 114#define FC_CMD_ABORTED 1 115#define FC_CMD_RESET 2 116#define FC_CMD_PLOGO 3 117#define FC_SNS_RCV 4 118#define FC_TRANS_ERR 5 119#define FC_DATA_OVRRUN 6 120#define FC_DATA_UNDRUN 7 121#define FC_ERROR 8 122#define FC_HRD_ERROR 9 123#define FC_CRC_ERROR 10 124#define FC_TIMED_OUT 11 125 126/* 127 * Error recovery timeout values. 128 */ 129#define FC_SCSI_TM_TOV (10 * HZ) 130#define FC_HOST_RESET_TIMEOUT (30 * HZ) 131#define FC_CAN_QUEUE_PERIOD (60 * HZ) 132 133#define FC_MAX_ERROR_CNT 5 134#define FC_MAX_RECOV_RETRY 3 135 136#define FC_FCP_DFLT_QUEUE_DEPTH 32 137 138/** 139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 140 * @lport: The local port that the FCP packet is for 141 * @gfp: GFP flags for allocation 142 * 143 * Return value: fcp_pkt structure or null on allocation failure. 144 * Context: Can be called from process context, no lock is required. 145 */ 146static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 147{ 148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 149 struct fc_fcp_pkt *fsp; 150 151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 152 if (fsp) { 153 memset(fsp, 0, sizeof(*fsp)); 154 fsp->lp = lport; 155 fsp->xfer_ddp = FC_XID_UNKNOWN; 156 atomic_set(&fsp->ref_cnt, 1); 157 init_timer(&fsp->timer); 158 fsp->timer.data = (unsigned long)fsp; 159 INIT_LIST_HEAD(&fsp->list); 160 spin_lock_init(&fsp->scsi_pkt_lock); 161 } 162 return fsp; 163} 164 165/** 166 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 167 * @fsp: The FCP packet to be released 168 * 169 * Context: Can be called from process or interrupt context, 170 * no lock is required. 171 */ 172static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 173{ 174 if (atomic_dec_and_test(&fsp->ref_cnt)) { 175 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 176 177 mempool_free(fsp, si->scsi_pkt_pool); 178 } 179} 180 181/** 182 * fc_fcp_pkt_hold() - Hold a fcp_pkt 183 * @fsp: The FCP packet to be held 184 */ 185static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 186{ 187 atomic_inc(&fsp->ref_cnt); 188} 189 190/** 191 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 192 * @seq: The sequence that the FCP packet is on (required by destructor API) 193 * @fsp: The FCP packet to be released 194 * 195 * This routine is called by a destructor callback in the exch_seq_send() 196 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 197 * argument even though it is not used by this routine. 198 * 199 * Context: No locking required. 200 */ 201static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 202{ 203 fc_fcp_pkt_release(fsp); 204} 205 206/** 207 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 208 * @fsp: The FCP packet to be locked and incremented 209 * 210 * We should only return error if we return a command to SCSI-ml before 211 * getting a response. This can happen in cases where we send a abort, but 212 * do not wait for the response and the abort and command can be passing 213 * each other on the wire/network-layer. 214 * 215 * Note: this function locks the packet and gets a reference to allow 216 * callers to call the completion function while the lock is held and 217 * not have to worry about the packets refcount. 218 * 219 * TODO: Maybe we should just have callers grab/release the lock and 220 * have a function that they call to verify the fsp and grab a ref if 221 * needed. 222 */ 223static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 224{ 225 spin_lock_bh(&fsp->scsi_pkt_lock); 226 if (fsp->state & FC_SRB_COMPL) { 227 spin_unlock_bh(&fsp->scsi_pkt_lock); 228 return -EPERM; 229 } 230 231 fc_fcp_pkt_hold(fsp); 232 return 0; 233} 234 235/** 236 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 237 * reference count 238 * @fsp: The FCP packet to be unlocked and decremented 239 */ 240static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 241{ 242 spin_unlock_bh(&fsp->scsi_pkt_lock); 243 fc_fcp_pkt_release(fsp); 244} 245 246/** 247 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 248 * @fsp: The FCP packet to start a timer for 249 * @delay: The timeout period in jiffies 250 */ 251static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 252{ 253 if (!(fsp->state & FC_SRB_COMPL)) 254 mod_timer(&fsp->timer, jiffies + delay); 255} 256 257/** 258 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 259 * fcp_pkt 260 * @fsp: The FCP packet to abort exchanges on 261 */ 262static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 263{ 264 if (!fsp->seq_ptr) 265 return -EINVAL; 266 267 fsp->state |= FC_SRB_ABORT_PENDING; 268 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 269} 270 271/** 272 * fc_fcp_retry_cmd() - Retry a fcp_pkt 273 * @fsp: The FCP packet to be retried 274 * 275 * Sets the status code to be FC_ERROR and then calls 276 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 277 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 278 * The SCSI-ml will retry the command. 279 */ 280static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 281{ 282 if (fsp->seq_ptr) { 283 fsp->lp->tt.exch_done(fsp->seq_ptr); 284 fsp->seq_ptr = NULL; 285 } 286 287 fsp->state &= ~FC_SRB_ABORT_PENDING; 288 fsp->io_status = 0; 289 fsp->status_code = FC_ERROR; 290 fc_fcp_complete_locked(fsp); 291} 292 293/** 294 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 295 * @fsp: The FCP packet that will manage the DDP frames 296 * @xid: The XID that will be used for the DDP exchange 297 */ 298void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 299{ 300 struct fc_lport *lport; 301 302 lport = fsp->lp; 303 if ((fsp->req_flags & FC_SRB_READ) && 304 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 305 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 306 scsi_sg_count(fsp->cmd))) 307 fsp->xfer_ddp = xid; 308 } 309} 310 311/** 312 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 313 * DDP related resources for a fcp_pkt 314 * @fsp: The FCP packet that DDP had been used on 315 */ 316void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 317{ 318 struct fc_lport *lport; 319 320 if (!fsp) 321 return; 322 323 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 324 return; 325 326 lport = fsp->lp; 327 if (lport->tt.ddp_done) { 328 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 329 fsp->xfer_ddp = FC_XID_UNKNOWN; 330 } 331} 332 333/** 334 * fc_fcp_can_queue_ramp_up() - increases can_queue 335 * @lport: lport to ramp up can_queue 336 */ 337static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 338{ 339 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 340 unsigned long flags; 341 int can_queue; 342 343 spin_lock_irqsave(lport->host->host_lock, flags); 344 345 if (si->last_can_queue_ramp_up_time && 346 (time_before(jiffies, si->last_can_queue_ramp_up_time + 347 FC_CAN_QUEUE_PERIOD))) 348 goto unlock; 349 350 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 351 FC_CAN_QUEUE_PERIOD)) 352 goto unlock; 353 354 si->last_can_queue_ramp_up_time = jiffies; 355 356 can_queue = lport->host->can_queue << 1; 357 if (can_queue >= si->max_can_queue) { 358 can_queue = si->max_can_queue; 359 si->last_can_queue_ramp_down_time = 0; 360 } 361 lport->host->can_queue = can_queue; 362 shost_printk(KERN_ERR, lport->host, "libfc: increased " 363 "can_queue to %d.\n", can_queue); 364 365unlock: 366 spin_unlock_irqrestore(lport->host->host_lock, flags); 367} 368 369/** 370 * fc_fcp_can_queue_ramp_down() - reduces can_queue 371 * @lport: lport to reduce can_queue 372 * 373 * If we are getting memory allocation failures, then we may 374 * be trying to execute too many commands. We let the running 375 * commands complete or timeout, then try again with a reduced 376 * can_queue. Eventually we will hit the point where we run 377 * on all reserved structs. 378 */ 379static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 380{ 381 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 382 unsigned long flags; 383 int can_queue; 384 385 spin_lock_irqsave(lport->host->host_lock, flags); 386 387 if (si->last_can_queue_ramp_down_time && 388 (time_before(jiffies, si->last_can_queue_ramp_down_time + 389 FC_CAN_QUEUE_PERIOD))) 390 goto unlock; 391 392 si->last_can_queue_ramp_down_time = jiffies; 393 394 can_queue = lport->host->can_queue; 395 can_queue >>= 1; 396 if (!can_queue) 397 can_queue = 1; 398 lport->host->can_queue = can_queue; 399 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 400 "Reducing can_queue to %d.\n", can_queue); 401 402unlock: 403 spin_unlock_irqrestore(lport->host->host_lock, flags); 404} 405 406/* 407 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 408 * @lport: fc lport struct 409 * @len: payload length 410 * 411 * Allocates fc_frame structure and buffer but if fails to allocate 412 * then reduce can_queue. 413 */ 414static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 415 size_t len) 416{ 417 struct fc_frame *fp; 418 419 fp = fc_frame_alloc(lport, len); 420 if (likely(fp)) 421 return fp; 422 423 /* error case */ 424 fc_fcp_can_queue_ramp_down(lport); 425 return NULL; 426} 427 428/** 429 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 430 * @fsp: The FCP packet the data is on 431 * @fp: The data frame 432 */ 433static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 434{ 435 struct scsi_cmnd *sc = fsp->cmd; 436 struct fc_lport *lport = fsp->lp; 437 struct fcoe_dev_stats *stats; 438 struct fc_frame_header *fh; 439 size_t start_offset; 440 size_t offset; 441 u32 crc; 442 u32 copy_len = 0; 443 size_t len; 444 void *buf; 445 struct scatterlist *sg; 446 u32 nents; 447 u8 host_bcode = FC_COMPLETE; 448 449 fh = fc_frame_header_get(fp); 450 offset = ntohl(fh->fh_parm_offset); 451 start_offset = offset; 452 len = fr_len(fp) - sizeof(*fh); 453 buf = fc_frame_payload_get(fp, 0); 454 455 /* 456 * if this I/O is ddped then clear it and initiate recovery since data 457 * frames are expected to be placed directly in that case. 458 * 459 * Indicate error to scsi-ml because something went wrong with the 460 * ddp handling to get us here. 461 */ 462 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 463 fc_fcp_ddp_done(fsp); 464 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 465 host_bcode = FC_ERROR; 466 goto err; 467 } 468 if (offset + len > fsp->data_len) { 469 /* this should never happen */ 470 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 471 fc_frame_crc_check(fp)) 472 goto crc_err; 473 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 474 "data_len %x\n", len, offset, fsp->data_len); 475 476 /* Data is corrupted indicate scsi-ml should retry */ 477 host_bcode = FC_DATA_OVRRUN; 478 goto err; 479 } 480 if (offset != fsp->xfer_len) 481 fsp->state |= FC_SRB_DISCONTIG; 482 483 sg = scsi_sglist(sc); 484 nents = scsi_sg_count(sc); 485 486 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 487 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 488 &offset, NULL); 489 } else { 490 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 491 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 492 &offset, &crc); 493 buf = fc_frame_payload_get(fp, 0); 494 if (len % 4) 495 crc = crc32(crc, buf + len, 4 - (len % 4)); 496 497 if (~crc != le32_to_cpu(fr_crc(fp))) { 498crc_err: 499 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 500 stats->ErrorFrames++; 501 /* per cpu count, not total count, but OK for limit */ 502 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) 503 printk(KERN_WARNING "libfc: CRC error on data " 504 "frame for port (%6.6x)\n", 505 lport->port_id); 506 put_cpu(); 507 /* 508 * Assume the frame is total garbage. 509 * We may have copied it over the good part 510 * of the buffer. 511 * If so, we need to retry the entire operation. 512 * Otherwise, ignore it. 513 */ 514 if (fsp->state & FC_SRB_DISCONTIG) { 515 host_bcode = FC_CRC_ERROR; 516 goto err; 517 } 518 return; 519 } 520 } 521 522 if (fsp->xfer_contig_end == start_offset) 523 fsp->xfer_contig_end += copy_len; 524 fsp->xfer_len += copy_len; 525 526 /* 527 * In the very rare event that this data arrived after the response 528 * and completes the transfer, call the completion handler. 529 */ 530 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 531 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 532 fc_fcp_complete_locked(fsp); 533 return; 534err: 535 fc_fcp_recovery(fsp, host_bcode); 536} 537 538/** 539 * fc_fcp_send_data() - Send SCSI data to a target 540 * @fsp: The FCP packet the data is on 541 * @sp: The sequence the data is to be sent on 542 * @offset: The starting offset for this data request 543 * @seq_blen: The burst length for this data request 544 * 545 * Called after receiving a Transfer Ready data descriptor. 546 * If the LLD is capable of sequence offload then send down the 547 * seq_blen amount of data in single frame, otherwise send 548 * multiple frames of the maximum frame payload supported by 549 * the target port. 550 */ 551static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 552 size_t offset, size_t seq_blen) 553{ 554 struct fc_exch *ep; 555 struct scsi_cmnd *sc; 556 struct scatterlist *sg; 557 struct fc_frame *fp = NULL; 558 struct fc_lport *lport = fsp->lp; 559 struct page *page; 560 size_t remaining; 561 size_t t_blen; 562 size_t tlen; 563 size_t sg_bytes; 564 size_t frame_offset, fh_parm_offset; 565 size_t off; 566 int error; 567 void *data = NULL; 568 void *page_addr; 569 int using_sg = lport->sg_supp; 570 u32 f_ctl; 571 572 WARN_ON(seq_blen <= 0); 573 if (unlikely(offset + seq_blen > fsp->data_len)) { 574 /* this should never happen */ 575 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 576 "offset %zx\n", seq_blen, offset); 577 fc_fcp_send_abort(fsp); 578 return 0; 579 } else if (offset != fsp->xfer_len) { 580 /* Out of Order Data Request - no problem, but unexpected. */ 581 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 582 "seq_blen %zx offset %zx\n", seq_blen, offset); 583 } 584 585 /* 586 * if LLD is capable of seq_offload then set transport 587 * burst length (t_blen) to seq_blen, otherwise set t_blen 588 * to max FC frame payload previously set in fsp->max_payload. 589 */ 590 t_blen = fsp->max_payload; 591 if (lport->seq_offload) { 592 t_blen = min(seq_blen, (size_t)lport->lso_max); 593 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 594 fsp, seq_blen, lport->lso_max, t_blen); 595 } 596 597 if (t_blen > 512) 598 t_blen &= ~(512 - 1); /* round down to block size */ 599 sc = fsp->cmd; 600 601 remaining = seq_blen; 602 fh_parm_offset = frame_offset = offset; 603 tlen = 0; 604 seq = lport->tt.seq_start_next(seq); 605 f_ctl = FC_FC_REL_OFF; 606 WARN_ON(!seq); 607 608 sg = scsi_sglist(sc); 609 610 while (remaining > 0 && sg) { 611 if (offset >= sg->length) { 612 offset -= sg->length; 613 sg = sg_next(sg); 614 continue; 615 } 616 if (!fp) { 617 tlen = min(t_blen, remaining); 618 619 /* 620 * TODO. Temporary workaround. fc_seq_send() can't 621 * handle odd lengths in non-linear skbs. 622 * This will be the final fragment only. 623 */ 624 if (tlen % 4) 625 using_sg = 0; 626 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 627 if (!fp) 628 return -ENOMEM; 629 630 data = fc_frame_header_get(fp) + 1; 631 fh_parm_offset = frame_offset; 632 fr_max_payload(fp) = fsp->max_payload; 633 } 634 635 off = offset + sg->offset; 636 sg_bytes = min(tlen, sg->length - offset); 637 sg_bytes = min(sg_bytes, 638 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 639 page = sg_page(sg) + (off >> PAGE_SHIFT); 640 if (using_sg) { 641 get_page(page); 642 skb_fill_page_desc(fp_skb(fp), 643 skb_shinfo(fp_skb(fp))->nr_frags, 644 page, off & ~PAGE_MASK, sg_bytes); 645 fp_skb(fp)->data_len += sg_bytes; 646 fr_len(fp) += sg_bytes; 647 fp_skb(fp)->truesize += PAGE_SIZE; 648 } else { 649 /* 650 * The scatterlist item may be bigger than PAGE_SIZE, 651 * but we must not cross pages inside the kmap. 652 */ 653 page_addr = kmap_atomic(page); 654 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 655 sg_bytes); 656 kunmap_atomic(page_addr); 657 data += sg_bytes; 658 } 659 offset += sg_bytes; 660 frame_offset += sg_bytes; 661 tlen -= sg_bytes; 662 remaining -= sg_bytes; 663 664 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 665 (tlen)) 666 continue; 667 668 /* 669 * Send sequence with transfer sequence initiative in case 670 * this is last FCP frame of the sequence. 671 */ 672 if (remaining == 0) 673 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 674 675 ep = fc_seq_exch(seq); 676 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 677 FC_TYPE_FCP, f_ctl, fh_parm_offset); 678 679 /* 680 * send fragment using for a sequence. 681 */ 682 error = lport->tt.seq_send(lport, seq, fp); 683 if (error) { 684 WARN_ON(1); /* send error should be rare */ 685 return error; 686 } 687 fp = NULL; 688 } 689 fsp->xfer_len += seq_blen; /* premature count? */ 690 return 0; 691} 692 693/** 694 * fc_fcp_abts_resp() - Receive an ABTS response 695 * @fsp: The FCP packet that is being aborted 696 * @fp: The response frame 697 */ 698static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 699{ 700 int ba_done = 1; 701 struct fc_ba_rjt *brp; 702 struct fc_frame_header *fh; 703 704 fh = fc_frame_header_get(fp); 705 switch (fh->fh_r_ctl) { 706 case FC_RCTL_BA_ACC: 707 break; 708 case FC_RCTL_BA_RJT: 709 brp = fc_frame_payload_get(fp, sizeof(*brp)); 710 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 711 break; 712 /* fall thru */ 713 default: 714 /* 715 * we will let the command timeout 716 * and scsi-ml recover in this case, 717 * therefore cleared the ba_done flag. 718 */ 719 ba_done = 0; 720 } 721 722 if (ba_done) { 723 fsp->state |= FC_SRB_ABORTED; 724 fsp->state &= ~FC_SRB_ABORT_PENDING; 725 726 if (fsp->wait_for_comp) 727 complete(&fsp->tm_done); 728 else 729 fc_fcp_complete_locked(fsp); 730 } 731} 732 733/** 734 * fc_fcp_recv() - Receive an FCP frame 735 * @seq: The sequence the frame is on 736 * @fp: The received frame 737 * @arg: The related FCP packet 738 * 739 * Context: Called from Soft IRQ context. Can not be called 740 * holding the FCP packet list lock. 741 */ 742static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 743{ 744 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 745 struct fc_lport *lport = fsp->lp; 746 struct fc_frame_header *fh; 747 struct fcp_txrdy *dd; 748 u8 r_ctl; 749 int rc = 0; 750 751 if (IS_ERR(fp)) { 752 fc_fcp_error(fsp, fp); 753 return; 754 } 755 756 fh = fc_frame_header_get(fp); 757 r_ctl = fh->fh_r_ctl; 758 759 if (lport->state != LPORT_ST_READY) 760 goto out; 761 if (fc_fcp_lock_pkt(fsp)) 762 goto out; 763 764 if (fh->fh_type == FC_TYPE_BLS) { 765 fc_fcp_abts_resp(fsp, fp); 766 goto unlock; 767 } 768 769 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 770 goto unlock; 771 772 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 773 /* 774 * received XFER RDY from the target 775 * need to send data to the target 776 */ 777 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 778 dd = fc_frame_payload_get(fp, sizeof(*dd)); 779 WARN_ON(!dd); 780 781 rc = fc_fcp_send_data(fsp, seq, 782 (size_t) ntohl(dd->ft_data_ro), 783 (size_t) ntohl(dd->ft_burst_len)); 784 if (!rc) 785 seq->rec_data = fsp->xfer_len; 786 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 787 /* 788 * received a DATA frame 789 * next we will copy the data to the system buffer 790 */ 791 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 792 fc_fcp_recv_data(fsp, fp); 793 seq->rec_data = fsp->xfer_contig_end; 794 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 795 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 796 797 fc_fcp_resp(fsp, fp); 798 } else { 799 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 800 } 801unlock: 802 fc_fcp_unlock_pkt(fsp); 803out: 804 fc_frame_free(fp); 805} 806 807/** 808 * fc_fcp_resp() - Handler for FCP responses 809 * @fsp: The FCP packet the response is for 810 * @fp: The response frame 811 */ 812static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 813{ 814 struct fc_frame_header *fh; 815 struct fcp_resp *fc_rp; 816 struct fcp_resp_ext *rp_ex; 817 struct fcp_resp_rsp_info *fc_rp_info; 818 u32 plen; 819 u32 expected_len; 820 u32 respl = 0; 821 u32 snsl = 0; 822 u8 flags = 0; 823 824 plen = fr_len(fp); 825 fh = (struct fc_frame_header *)fr_hdr(fp); 826 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 827 goto len_err; 828 plen -= sizeof(*fh); 829 fc_rp = (struct fcp_resp *)(fh + 1); 830 fsp->cdb_status = fc_rp->fr_status; 831 flags = fc_rp->fr_flags; 832 fsp->scsi_comp_flags = flags; 833 expected_len = fsp->data_len; 834 835 /* if ddp, update xfer len */ 836 fc_fcp_ddp_done(fsp); 837 838 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 839 rp_ex = (void *)(fc_rp + 1); 840 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 841 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 842 goto len_err; 843 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 844 if (flags & FCP_RSP_LEN_VAL) { 845 respl = ntohl(rp_ex->fr_rsp_len); 846 if (respl != sizeof(*fc_rp_info)) 847 goto len_err; 848 if (fsp->wait_for_comp) { 849 /* Abuse cdb_status for rsp code */ 850 fsp->cdb_status = fc_rp_info->rsp_code; 851 complete(&fsp->tm_done); 852 /* 853 * tmfs will not have any scsi cmd so 854 * exit here 855 */ 856 return; 857 } 858 } 859 if (flags & FCP_SNS_LEN_VAL) { 860 snsl = ntohl(rp_ex->fr_sns_len); 861 if (snsl > SCSI_SENSE_BUFFERSIZE) 862 snsl = SCSI_SENSE_BUFFERSIZE; 863 memcpy(fsp->cmd->sense_buffer, 864 (char *)fc_rp_info + respl, snsl); 865 } 866 } 867 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 868 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 869 goto len_err; 870 if (flags & FCP_RESID_UNDER) { 871 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 872 /* 873 * The cmnd->underflow is the minimum number of 874 * bytes that must be transferred for this 875 * command. Provided a sense condition is not 876 * present, make sure the actual amount 877 * transferred is at least the underflow value 878 * or fail. 879 */ 880 if (!(flags & FCP_SNS_LEN_VAL) && 881 (fc_rp->fr_status == 0) && 882 (scsi_bufflen(fsp->cmd) - 883 fsp->scsi_resid) < fsp->cmd->underflow) 884 goto err; 885 expected_len -= fsp->scsi_resid; 886 } else { 887 fsp->status_code = FC_ERROR; 888 } 889 } 890 } 891 fsp->state |= FC_SRB_RCV_STATUS; 892 893 /* 894 * Check for missing or extra data frames. 895 */ 896 if (unlikely(fsp->xfer_len != expected_len)) { 897 if (fsp->xfer_len < expected_len) { 898 /* 899 * Some data may be queued locally, 900 * Wait a at least one jiffy to see if it is delivered. 901 * If this expires without data, we may do SRR. 902 */ 903 fc_fcp_timer_set(fsp, 2); 904 return; 905 } 906 fsp->status_code = FC_DATA_OVRRUN; 907 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 908 "len %x, data len %x\n", 909 fsp->rport->port_id, 910 fsp->xfer_len, expected_len, fsp->data_len); 911 } 912 fc_fcp_complete_locked(fsp); 913 return; 914 915len_err: 916 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 917 "snsl %u\n", flags, fr_len(fp), respl, snsl); 918err: 919 fsp->status_code = FC_ERROR; 920 fc_fcp_complete_locked(fsp); 921} 922 923/** 924 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 925 * fcp_pkt lock held 926 * @fsp: The FCP packet to be completed 927 * 928 * This function may sleep if a timer is pending. The packet lock must be 929 * held, and the host lock must not be held. 930 */ 931static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 932{ 933 struct fc_lport *lport = fsp->lp; 934 struct fc_seq *seq; 935 struct fc_exch *ep; 936 u32 f_ctl; 937 938 if (fsp->state & FC_SRB_ABORT_PENDING) 939 return; 940 941 if (fsp->state & FC_SRB_ABORTED) { 942 if (!fsp->status_code) 943 fsp->status_code = FC_CMD_ABORTED; 944 } else { 945 /* 946 * Test for transport underrun, independent of response 947 * underrun status. 948 */ 949 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 950 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 951 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 952 fsp->status_code = FC_DATA_UNDRUN; 953 fsp->io_status = 0; 954 } 955 } 956 957 seq = fsp->seq_ptr; 958 if (seq) { 959 fsp->seq_ptr = NULL; 960 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 961 struct fc_frame *conf_frame; 962 struct fc_seq *csp; 963 964 csp = lport->tt.seq_start_next(seq); 965 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 966 if (conf_frame) { 967 f_ctl = FC_FC_SEQ_INIT; 968 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 969 ep = fc_seq_exch(seq); 970 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 971 ep->did, ep->sid, 972 FC_TYPE_FCP, f_ctl, 0); 973 lport->tt.seq_send(lport, csp, conf_frame); 974 } 975 } 976 lport->tt.exch_done(seq); 977 } 978 /* 979 * Some resets driven by SCSI are not I/Os and do not have 980 * SCSI commands associated with the requests. We should not 981 * call I/O completion if we do not have a SCSI command. 982 */ 983 if (fsp->cmd) 984 fc_io_compl(fsp); 985} 986 987/** 988 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 989 * @fsp: The FCP packet whose exchanges should be canceled 990 * @error: The reason for the cancellation 991 */ 992static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 993{ 994 struct fc_lport *lport = fsp->lp; 995 996 if (fsp->seq_ptr) { 997 lport->tt.exch_done(fsp->seq_ptr); 998 fsp->seq_ptr = NULL; 999 } 1000 fsp->status_code = error; 1001} 1002 1003/** 1004 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1005 * @lport: The local port whose exchanges should be canceled 1006 * @id: The target's ID 1007 * @lun: The LUN 1008 * @error: The reason for cancellation 1009 * 1010 * If lun or id is -1, they are ignored. 1011 */ 1012static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1013 unsigned int lun, int error) 1014{ 1015 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1016 struct fc_fcp_pkt *fsp; 1017 struct scsi_cmnd *sc_cmd; 1018 unsigned long flags; 1019 1020 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1021restart: 1022 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1023 sc_cmd = fsp->cmd; 1024 if (id != -1 && scmd_id(sc_cmd) != id) 1025 continue; 1026 1027 if (lun != -1 && sc_cmd->device->lun != lun) 1028 continue; 1029 1030 fc_fcp_pkt_hold(fsp); 1031 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1032 1033 if (!fc_fcp_lock_pkt(fsp)) { 1034 fc_fcp_cleanup_cmd(fsp, error); 1035 fc_io_compl(fsp); 1036 fc_fcp_unlock_pkt(fsp); 1037 } 1038 1039 fc_fcp_pkt_release(fsp); 1040 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1041 /* 1042 * while we dropped the lock multiple pkts could 1043 * have been released, so we have to start over. 1044 */ 1045 goto restart; 1046 } 1047 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1048} 1049 1050/** 1051 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1052 * @lport: The local port whose exchanges are to be aborted 1053 */ 1054static void fc_fcp_abort_io(struct fc_lport *lport) 1055{ 1056 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1057} 1058 1059/** 1060 * fc_fcp_pkt_send() - Send a fcp_pkt 1061 * @lport: The local port to send the FCP packet on 1062 * @fsp: The FCP packet to send 1063 * 1064 * Return: Zero for success and -1 for failure 1065 * Locks: Called without locks held 1066 */ 1067static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1068{ 1069 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1070 unsigned long flags; 1071 int rc; 1072 1073 fsp->cmd->SCp.ptr = (char *)fsp; 1074 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1075 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1076 1077 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1078 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1079 1080 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1081 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1082 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1083 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1084 if (unlikely(rc)) { 1085 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1086 fsp->cmd->SCp.ptr = NULL; 1087 list_del(&fsp->list); 1088 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1089 } 1090 1091 return rc; 1092} 1093 1094/** 1095 * get_fsp_rec_tov() - Helper function to get REC_TOV 1096 * @fsp: the FCP packet 1097 * 1098 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 1099 */ 1100static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 1101{ 1102 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 1103 1104 return msecs_to_jiffies(rpriv->e_d_tov) + HZ; 1105} 1106 1107/** 1108 * fc_fcp_cmd_send() - Send a FCP command 1109 * @lport: The local port to send the command on 1110 * @fsp: The FCP packet the command is on 1111 * @resp: The handler for the response 1112 */ 1113static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1114 void (*resp)(struct fc_seq *, 1115 struct fc_frame *fp, 1116 void *arg)) 1117{ 1118 struct fc_frame *fp; 1119 struct fc_seq *seq; 1120 struct fc_rport *rport; 1121 struct fc_rport_libfc_priv *rpriv; 1122 const size_t len = sizeof(fsp->cdb_cmd); 1123 int rc = 0; 1124 1125 if (fc_fcp_lock_pkt(fsp)) 1126 return 0; 1127 1128 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1129 if (!fp) { 1130 rc = -1; 1131 goto unlock; 1132 } 1133 1134 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1135 fr_fsp(fp) = fsp; 1136 rport = fsp->rport; 1137 fsp->max_payload = rport->maxframe_size; 1138 rpriv = rport->dd_data; 1139 1140 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1141 rpriv->local_port->port_id, FC_TYPE_FCP, 1142 FC_FCTL_REQ, 0); 1143 1144 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1145 fsp, 0); 1146 if (!seq) { 1147 rc = -1; 1148 goto unlock; 1149 } 1150 fsp->seq_ptr = seq; 1151 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1152 1153 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1154 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1155 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1156 1157unlock: 1158 fc_fcp_unlock_pkt(fsp); 1159 return rc; 1160} 1161 1162/** 1163 * fc_fcp_error() - Handler for FCP layer errors 1164 * @fsp: The FCP packet the error is on 1165 * @fp: The frame that has errored 1166 */ 1167static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1168{ 1169 int error = PTR_ERR(fp); 1170 1171 if (fc_fcp_lock_pkt(fsp)) 1172 return; 1173 1174 if (error == -FC_EX_CLOSED) { 1175 fc_fcp_retry_cmd(fsp); 1176 goto unlock; 1177 } 1178 1179 /* 1180 * clear abort pending, because the lower layer 1181 * decided to force completion. 1182 */ 1183 fsp->state &= ~FC_SRB_ABORT_PENDING; 1184 fsp->status_code = FC_CMD_PLOGO; 1185 fc_fcp_complete_locked(fsp); 1186unlock: 1187 fc_fcp_unlock_pkt(fsp); 1188} 1189 1190/** 1191 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1192 * @fsp: The FCP packet to abort on 1193 * 1194 * Called to send an abort and then wait for abort completion 1195 */ 1196static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1197{ 1198 int rc = FAILED; 1199 unsigned long ticks_left; 1200 1201 if (fc_fcp_send_abort(fsp)) 1202 return FAILED; 1203 1204 init_completion(&fsp->tm_done); 1205 fsp->wait_for_comp = 1; 1206 1207 spin_unlock_bh(&fsp->scsi_pkt_lock); 1208 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1209 FC_SCSI_TM_TOV); 1210 spin_lock_bh(&fsp->scsi_pkt_lock); 1211 fsp->wait_for_comp = 0; 1212 1213 if (!ticks_left) { 1214 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1215 } else if (fsp->state & FC_SRB_ABORTED) { 1216 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1217 rc = SUCCESS; 1218 fc_fcp_complete_locked(fsp); 1219 } 1220 1221 return rc; 1222} 1223 1224/** 1225 * fc_lun_reset_send() - Send LUN reset command 1226 * @data: The FCP packet that identifies the LUN to be reset 1227 */ 1228static void fc_lun_reset_send(unsigned long data) 1229{ 1230 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1231 struct fc_lport *lport = fsp->lp; 1232 1233 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1234 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1235 return; 1236 if (fc_fcp_lock_pkt(fsp)) 1237 return; 1238 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1239 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1240 fc_fcp_unlock_pkt(fsp); 1241 } 1242} 1243 1244/** 1245 * fc_lun_reset() - Send a LUN RESET command to a device 1246 * and wait for the reply 1247 * @lport: The local port to sent the command on 1248 * @fsp: The FCP packet that identifies the LUN to be reset 1249 * @id: The SCSI command ID 1250 * @lun: The LUN ID to be reset 1251 */ 1252static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1253 unsigned int id, unsigned int lun) 1254{ 1255 int rc; 1256 1257 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1258 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1259 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1260 1261 fsp->wait_for_comp = 1; 1262 init_completion(&fsp->tm_done); 1263 1264 fc_lun_reset_send((unsigned long)fsp); 1265 1266 /* 1267 * wait for completion of reset 1268 * after that make sure all commands are terminated 1269 */ 1270 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1271 1272 spin_lock_bh(&fsp->scsi_pkt_lock); 1273 fsp->state |= FC_SRB_COMPL; 1274 spin_unlock_bh(&fsp->scsi_pkt_lock); 1275 1276 del_timer_sync(&fsp->timer); 1277 1278 spin_lock_bh(&fsp->scsi_pkt_lock); 1279 if (fsp->seq_ptr) { 1280 lport->tt.exch_done(fsp->seq_ptr); 1281 fsp->seq_ptr = NULL; 1282 } 1283 fsp->wait_for_comp = 0; 1284 spin_unlock_bh(&fsp->scsi_pkt_lock); 1285 1286 if (!rc) { 1287 FC_SCSI_DBG(lport, "lun reset failed\n"); 1288 return FAILED; 1289 } 1290 1291 /* cdb_status holds the tmf's rsp code */ 1292 if (fsp->cdb_status != FCP_TMF_CMPL) 1293 return FAILED; 1294 1295 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1296 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1297 return SUCCESS; 1298} 1299 1300/** 1301 * fc_tm_done() - Task Management response handler 1302 * @seq: The sequence that the response is on 1303 * @fp: The response frame 1304 * @arg: The FCP packet the response is for 1305 */ 1306static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1307{ 1308 struct fc_fcp_pkt *fsp = arg; 1309 struct fc_frame_header *fh; 1310 1311 if (IS_ERR(fp)) { 1312 /* 1313 * If there is an error just let it timeout or wait 1314 * for TMF to be aborted if it timedout. 1315 * 1316 * scsi-eh will escalate for when either happens. 1317 */ 1318 return; 1319 } 1320 1321 if (fc_fcp_lock_pkt(fsp)) 1322 goto out; 1323 1324 /* 1325 * raced with eh timeout handler. 1326 */ 1327 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1328 goto out_unlock; 1329 1330 fh = fc_frame_header_get(fp); 1331 if (fh->fh_type != FC_TYPE_BLS) 1332 fc_fcp_resp(fsp, fp); 1333 fsp->seq_ptr = NULL; 1334 fsp->lp->tt.exch_done(seq); 1335out_unlock: 1336 fc_fcp_unlock_pkt(fsp); 1337out: 1338 fc_frame_free(fp); 1339} 1340 1341/** 1342 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1343 * @lport: The local port to be cleaned up 1344 */ 1345static void fc_fcp_cleanup(struct fc_lport *lport) 1346{ 1347 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1348} 1349 1350/** 1351 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1352 * @data: The FCP packet that has timed out 1353 * 1354 * If REC is supported then just issue it and return. The REC exchange will 1355 * complete or time out and recovery can continue at that point. Otherwise, 1356 * if the response has been received without all the data it has been 1357 * ER_TIMEOUT since the response was received. If the response has not been 1358 * received we see if data was received recently. If it has been then we 1359 * continue waiting, otherwise, we abort the command. 1360 */ 1361static void fc_fcp_timeout(unsigned long data) 1362{ 1363 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1364 struct fc_rport *rport = fsp->rport; 1365 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1366 1367 if (fc_fcp_lock_pkt(fsp)) 1368 return; 1369 1370 if (fsp->cdb_cmd.fc_tm_flags) 1371 goto unlock; 1372 1373 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1374 1375 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1376 fc_fcp_rec(fsp); 1377 else if (fsp->state & FC_SRB_RCV_STATUS) 1378 fc_fcp_complete_locked(fsp); 1379 else 1380 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1381 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1382unlock: 1383 fc_fcp_unlock_pkt(fsp); 1384} 1385 1386/** 1387 * fc_fcp_rec() - Send a REC ELS request 1388 * @fsp: The FCP packet to send the REC request on 1389 */ 1390static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1391{ 1392 struct fc_lport *lport; 1393 struct fc_frame *fp; 1394 struct fc_rport *rport; 1395 struct fc_rport_libfc_priv *rpriv; 1396 1397 lport = fsp->lp; 1398 rport = fsp->rport; 1399 rpriv = rport->dd_data; 1400 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1401 fsp->status_code = FC_HRD_ERROR; 1402 fsp->io_status = 0; 1403 fc_fcp_complete_locked(fsp); 1404 return; 1405 } 1406 1407 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1408 if (!fp) 1409 goto retry; 1410 1411 fr_seq(fp) = fsp->seq_ptr; 1412 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1413 rpriv->local_port->port_id, FC_TYPE_ELS, 1414 FC_FCTL_REQ, 0); 1415 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1416 fc_fcp_rec_resp, fsp, 1417 2 * lport->r_a_tov)) { 1418 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1419 return; 1420 } 1421retry: 1422 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1423 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1424 else 1425 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1426} 1427 1428/** 1429 * fc_fcp_rec_resp() - Handler for REC ELS responses 1430 * @seq: The sequence the response is on 1431 * @fp: The response frame 1432 * @arg: The FCP packet the response is on 1433 * 1434 * If the response is a reject then the scsi layer will handle 1435 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1436 * set the timeout and return. If the I/O was completed then complete the 1437 * exchange and tell the SCSI layer. 1438 */ 1439static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1440{ 1441 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1442 struct fc_els_rec_acc *recp; 1443 struct fc_els_ls_rjt *rjt; 1444 u32 e_stat; 1445 u8 opcode; 1446 u32 offset; 1447 enum dma_data_direction data_dir; 1448 enum fc_rctl r_ctl; 1449 struct fc_rport_libfc_priv *rpriv; 1450 1451 if (IS_ERR(fp)) { 1452 fc_fcp_rec_error(fsp, fp); 1453 return; 1454 } 1455 1456 if (fc_fcp_lock_pkt(fsp)) 1457 goto out; 1458 1459 fsp->recov_retry = 0; 1460 opcode = fc_frame_payload_op(fp); 1461 if (opcode == ELS_LS_RJT) { 1462 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1463 switch (rjt->er_reason) { 1464 default: 1465 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1466 "reason %d expl %d\n", 1467 fsp->rport->port_id, rjt->er_reason, 1468 rjt->er_explan); 1469 /* fall through */ 1470 case ELS_RJT_UNSUP: 1471 FC_FCP_DBG(fsp, "device does not support REC\n"); 1472 rpriv = fsp->rport->dd_data; 1473 /* 1474 * if we do not spport RECs or got some bogus 1475 * reason then resetup timer so we check for 1476 * making progress. 1477 */ 1478 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1479 break; 1480 case ELS_RJT_LOGIC: 1481 case ELS_RJT_UNAB: 1482 /* 1483 * If no data transfer, the command frame got dropped 1484 * so we just retry. If data was transferred, we 1485 * lost the response but the target has no record, 1486 * so we abort and retry. 1487 */ 1488 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1489 fsp->xfer_len == 0) { 1490 fc_fcp_retry_cmd(fsp); 1491 break; 1492 } 1493 fc_fcp_recovery(fsp, FC_ERROR); 1494 break; 1495 } 1496 } else if (opcode == ELS_LS_ACC) { 1497 if (fsp->state & FC_SRB_ABORTED) 1498 goto unlock_out; 1499 1500 data_dir = fsp->cmd->sc_data_direction; 1501 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1502 offset = ntohl(recp->reca_fc4value); 1503 e_stat = ntohl(recp->reca_e_stat); 1504 1505 if (e_stat & ESB_ST_COMPLETE) { 1506 1507 /* 1508 * The exchange is complete. 1509 * 1510 * For output, we must've lost the response. 1511 * For input, all data must've been sent. 1512 * We lost may have lost the response 1513 * (and a confirmation was requested) and maybe 1514 * some data. 1515 * 1516 * If all data received, send SRR 1517 * asking for response. If partial data received, 1518 * or gaps, SRR requests data at start of gap. 1519 * Recovery via SRR relies on in-order-delivery. 1520 */ 1521 if (data_dir == DMA_TO_DEVICE) { 1522 r_ctl = FC_RCTL_DD_CMD_STATUS; 1523 } else if (fsp->xfer_contig_end == offset) { 1524 r_ctl = FC_RCTL_DD_CMD_STATUS; 1525 } else { 1526 offset = fsp->xfer_contig_end; 1527 r_ctl = FC_RCTL_DD_SOL_DATA; 1528 } 1529 fc_fcp_srr(fsp, r_ctl, offset); 1530 } else if (e_stat & ESB_ST_SEQ_INIT) { 1531 /* 1532 * The remote port has the initiative, so just 1533 * keep waiting for it to complete. 1534 */ 1535 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1536 } else { 1537 1538 /* 1539 * The exchange is incomplete, we have seq. initiative. 1540 * Lost response with requested confirmation, 1541 * lost confirmation, lost transfer ready or 1542 * lost write data. 1543 * 1544 * For output, if not all data was received, ask 1545 * for transfer ready to be repeated. 1546 * 1547 * If we received or sent all the data, send SRR to 1548 * request response. 1549 * 1550 * If we lost a response, we may have lost some read 1551 * data as well. 1552 */ 1553 r_ctl = FC_RCTL_DD_SOL_DATA; 1554 if (data_dir == DMA_TO_DEVICE) { 1555 r_ctl = FC_RCTL_DD_CMD_STATUS; 1556 if (offset < fsp->data_len) 1557 r_ctl = FC_RCTL_DD_DATA_DESC; 1558 } else if (offset == fsp->xfer_contig_end) { 1559 r_ctl = FC_RCTL_DD_CMD_STATUS; 1560 } else if (fsp->xfer_contig_end < offset) { 1561 offset = fsp->xfer_contig_end; 1562 } 1563 fc_fcp_srr(fsp, r_ctl, offset); 1564 } 1565 } 1566unlock_out: 1567 fc_fcp_unlock_pkt(fsp); 1568out: 1569 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1570 fc_frame_free(fp); 1571} 1572 1573/** 1574 * fc_fcp_rec_error() - Handler for REC errors 1575 * @fsp: The FCP packet the error is on 1576 * @fp: The REC frame 1577 */ 1578static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1579{ 1580 int error = PTR_ERR(fp); 1581 1582 if (fc_fcp_lock_pkt(fsp)) 1583 goto out; 1584 1585 switch (error) { 1586 case -FC_EX_CLOSED: 1587 fc_fcp_retry_cmd(fsp); 1588 break; 1589 1590 default: 1591 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1592 fsp, fsp->rport->port_id, error); 1593 fsp->status_code = FC_CMD_PLOGO; 1594 /* fall through */ 1595 1596 case -FC_EX_TIMEOUT: 1597 /* 1598 * Assume REC or LS_ACC was lost. 1599 * The exchange manager will have aborted REC, so retry. 1600 */ 1601 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", 1602 fsp->rport->port_id, error, fsp->recov_retry, 1603 FC_MAX_RECOV_RETRY); 1604 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1605 fc_fcp_rec(fsp); 1606 else 1607 fc_fcp_recovery(fsp, FC_ERROR); 1608 break; 1609 } 1610 fc_fcp_unlock_pkt(fsp); 1611out: 1612 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1613} 1614 1615/** 1616 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1617 * @fsp: The FCP pkt that needs to be aborted 1618 */ 1619static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1620{ 1621 fsp->status_code = code; 1622 fsp->cdb_status = 0; 1623 fsp->io_status = 0; 1624 /* 1625 * if this fails then we let the scsi command timer fire and 1626 * scsi-ml escalate. 1627 */ 1628 fc_fcp_send_abort(fsp); 1629} 1630 1631/** 1632 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1633 * @fsp: The FCP packet the SRR is to be sent on 1634 * @r_ctl: The R_CTL field for the SRR request 1635 * This is called after receiving status but insufficient data, or 1636 * when expecting status but the request has timed out. 1637 */ 1638static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1639{ 1640 struct fc_lport *lport = fsp->lp; 1641 struct fc_rport *rport; 1642 struct fc_rport_libfc_priv *rpriv; 1643 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1644 struct fc_seq *seq; 1645 struct fcp_srr *srr; 1646 struct fc_frame *fp; 1647 unsigned int rec_tov; 1648 1649 rport = fsp->rport; 1650 rpriv = rport->dd_data; 1651 1652 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1653 rpriv->rp_state != RPORT_ST_READY) 1654 goto retry; /* shouldn't happen */ 1655 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1656 if (!fp) 1657 goto retry; 1658 1659 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1660 memset(srr, 0, sizeof(*srr)); 1661 srr->srr_op = ELS_SRR; 1662 srr->srr_ox_id = htons(ep->oxid); 1663 srr->srr_rx_id = htons(ep->rxid); 1664 srr->srr_r_ctl = r_ctl; 1665 srr->srr_rel_off = htonl(offset); 1666 1667 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1668 rpriv->local_port->port_id, FC_TYPE_FCP, 1669 FC_FCTL_REQ, 0); 1670 1671 rec_tov = get_fsp_rec_tov(fsp); 1672 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, 1673 fc_fcp_pkt_destroy, 1674 fsp, jiffies_to_msecs(rec_tov)); 1675 if (!seq) 1676 goto retry; 1677 1678 fsp->recov_seq = seq; 1679 fsp->xfer_len = offset; 1680 fsp->xfer_contig_end = offset; 1681 fsp->state &= ~FC_SRB_RCV_STATUS; 1682 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1683 return; 1684retry: 1685 fc_fcp_retry_cmd(fsp); 1686} 1687 1688/** 1689 * fc_fcp_srr_resp() - Handler for SRR response 1690 * @seq: The sequence the SRR is on 1691 * @fp: The SRR frame 1692 * @arg: The FCP packet the SRR is on 1693 */ 1694static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1695{ 1696 struct fc_fcp_pkt *fsp = arg; 1697 struct fc_frame_header *fh; 1698 1699 if (IS_ERR(fp)) { 1700 fc_fcp_srr_error(fsp, fp); 1701 return; 1702 } 1703 1704 if (fc_fcp_lock_pkt(fsp)) 1705 goto out; 1706 1707 fh = fc_frame_header_get(fp); 1708 /* 1709 * BUG? fc_fcp_srr_error calls exch_done which would release 1710 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1711 * then fc_exch_timeout would be sending an abort. The exch_done 1712 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1713 * an abort response though. 1714 */ 1715 if (fh->fh_type == FC_TYPE_BLS) { 1716 fc_fcp_unlock_pkt(fsp); 1717 return; 1718 } 1719 1720 switch (fc_frame_payload_op(fp)) { 1721 case ELS_LS_ACC: 1722 fsp->recov_retry = 0; 1723 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1724 break; 1725 case ELS_LS_RJT: 1726 default: 1727 fc_fcp_recovery(fsp, FC_ERROR); 1728 break; 1729 } 1730 fc_fcp_unlock_pkt(fsp); 1731out: 1732 fsp->lp->tt.exch_done(seq); 1733 fc_frame_free(fp); 1734} 1735 1736/** 1737 * fc_fcp_srr_error() - Handler for SRR errors 1738 * @fsp: The FCP packet that the SRR error is on 1739 * @fp: The SRR frame 1740 */ 1741static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1742{ 1743 if (fc_fcp_lock_pkt(fsp)) 1744 goto out; 1745 switch (PTR_ERR(fp)) { 1746 case -FC_EX_TIMEOUT: 1747 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1748 fc_fcp_rec(fsp); 1749 else 1750 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1751 break; 1752 case -FC_EX_CLOSED: /* e.g., link failure */ 1753 /* fall through */ 1754 default: 1755 fc_fcp_retry_cmd(fsp); 1756 break; 1757 } 1758 fc_fcp_unlock_pkt(fsp); 1759out: 1760 fsp->lp->tt.exch_done(fsp->recov_seq); 1761} 1762 1763/** 1764 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1765 * @lport: The local port to be checked 1766 */ 1767static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1768{ 1769 /* lock ? */ 1770 return (lport->state == LPORT_ST_READY) && 1771 lport->link_up && !lport->qfull; 1772} 1773 1774/** 1775 * fc_queuecommand() - The queuecommand function of the SCSI template 1776 * @shost: The Scsi_Host that the command was issued to 1777 * @cmd: The scsi_cmnd to be executed 1778 * 1779 * This is the i/o strategy routine, called by the SCSI layer. 1780 */ 1781int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1782{ 1783 struct fc_lport *lport = shost_priv(shost); 1784 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1785 struct fc_fcp_pkt *fsp; 1786 struct fc_rport_libfc_priv *rpriv; 1787 int rval; 1788 int rc = 0; 1789 struct fcoe_dev_stats *stats; 1790 1791 rval = fc_remote_port_chkready(rport); 1792 if (rval) { 1793 sc_cmd->result = rval; 1794 sc_cmd->scsi_done(sc_cmd); 1795 return 0; 1796 } 1797 1798 if (!*(struct fc_remote_port **)rport->dd_data) { 1799 /* 1800 * rport is transitioning from blocked/deleted to 1801 * online 1802 */ 1803 sc_cmd->result = DID_IMM_RETRY << 16; 1804 sc_cmd->scsi_done(sc_cmd); 1805 goto out; 1806 } 1807 1808 rpriv = rport->dd_data; 1809 1810 if (!fc_fcp_lport_queue_ready(lport)) { 1811 if (lport->qfull) 1812 fc_fcp_can_queue_ramp_down(lport); 1813 rc = SCSI_MLQUEUE_HOST_BUSY; 1814 goto out; 1815 } 1816 1817 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1818 if (fsp == NULL) { 1819 rc = SCSI_MLQUEUE_HOST_BUSY; 1820 goto out; 1821 } 1822 1823 /* 1824 * build the libfc request pkt 1825 */ 1826 fsp->cmd = sc_cmd; /* save the cmd */ 1827 fsp->rport = rport; /* set the remote port ptr */ 1828 1829 /* 1830 * set up the transfer length 1831 */ 1832 fsp->data_len = scsi_bufflen(sc_cmd); 1833 fsp->xfer_len = 0; 1834 1835 /* 1836 * setup the data direction 1837 */ 1838 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1839 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1840 fsp->req_flags = FC_SRB_READ; 1841 stats->InputRequests++; 1842 stats->InputBytes += fsp->data_len; 1843 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1844 fsp->req_flags = FC_SRB_WRITE; 1845 stats->OutputRequests++; 1846 stats->OutputBytes += fsp->data_len; 1847 } else { 1848 fsp->req_flags = 0; 1849 stats->ControlRequests++; 1850 } 1851 put_cpu(); 1852 1853 /* 1854 * send it to the lower layer 1855 * if we get -1 return then put the request in the pending 1856 * queue. 1857 */ 1858 rval = fc_fcp_pkt_send(lport, fsp); 1859 if (rval != 0) { 1860 fsp->state = FC_SRB_FREE; 1861 fc_fcp_pkt_release(fsp); 1862 rc = SCSI_MLQUEUE_HOST_BUSY; 1863 } 1864out: 1865 return rc; 1866} 1867EXPORT_SYMBOL(fc_queuecommand); 1868 1869/** 1870 * fc_io_compl() - Handle responses for completed commands 1871 * @fsp: The FCP packet that is complete 1872 * 1873 * Translates fcp_pkt errors to a Linux SCSI errors. 1874 * The fcp packet lock must be held when calling. 1875 */ 1876static void fc_io_compl(struct fc_fcp_pkt *fsp) 1877{ 1878 struct fc_fcp_internal *si; 1879 struct scsi_cmnd *sc_cmd; 1880 struct fc_lport *lport; 1881 unsigned long flags; 1882 1883 /* release outstanding ddp context */ 1884 fc_fcp_ddp_done(fsp); 1885 1886 fsp->state |= FC_SRB_COMPL; 1887 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1888 spin_unlock_bh(&fsp->scsi_pkt_lock); 1889 del_timer_sync(&fsp->timer); 1890 spin_lock_bh(&fsp->scsi_pkt_lock); 1891 } 1892 1893 lport = fsp->lp; 1894 si = fc_get_scsi_internal(lport); 1895 1896 /* 1897 * if can_queue ramp down is done then try can_queue ramp up 1898 * since commands are completing now. 1899 */ 1900 if (si->last_can_queue_ramp_down_time) 1901 fc_fcp_can_queue_ramp_up(lport); 1902 1903 sc_cmd = fsp->cmd; 1904 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1905 switch (fsp->status_code) { 1906 case FC_COMPLETE: 1907 if (fsp->cdb_status == 0) { 1908 /* 1909 * good I/O status 1910 */ 1911 sc_cmd->result = DID_OK << 16; 1912 if (fsp->scsi_resid) 1913 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1914 } else { 1915 /* 1916 * transport level I/O was ok but scsi 1917 * has non zero status 1918 */ 1919 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1920 } 1921 break; 1922 case FC_ERROR: 1923 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1924 "due to FC_ERROR\n"); 1925 sc_cmd->result = DID_ERROR << 16; 1926 break; 1927 case FC_DATA_UNDRUN: 1928 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1929 /* 1930 * scsi status is good but transport level 1931 * underrun. 1932 */ 1933 if (fsp->state & FC_SRB_RCV_STATUS) { 1934 sc_cmd->result = DID_OK << 16; 1935 } else { 1936 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 1937 " due to FC_DATA_UNDRUN (trans)\n"); 1938 sc_cmd->result = DID_ERROR << 16; 1939 } 1940 } else { 1941 /* 1942 * scsi got underrun, this is an error 1943 */ 1944 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1945 "due to FC_DATA_UNDRUN (scsi)\n"); 1946 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1947 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1948 } 1949 break; 1950 case FC_DATA_OVRRUN: 1951 /* 1952 * overrun is an error 1953 */ 1954 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1955 "due to FC_DATA_OVRRUN\n"); 1956 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1957 break; 1958 case FC_CMD_ABORTED: 1959 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1960 "due to FC_CMD_ABORTED\n"); 1961 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1962 break; 1963 case FC_CMD_RESET: 1964 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 1965 "due to FC_CMD_RESET\n"); 1966 sc_cmd->result = (DID_RESET << 16); 1967 break; 1968 case FC_HRD_ERROR: 1969 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 1970 "due to FC_HRD_ERROR\n"); 1971 sc_cmd->result = (DID_NO_CONNECT << 16); 1972 break; 1973 case FC_CRC_ERROR: 1974 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 1975 "due to FC_CRC_ERROR\n"); 1976 sc_cmd->result = (DID_PARITY << 16); 1977 break; 1978 case FC_TIMED_OUT: 1979 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 1980 "due to FC_TIMED_OUT\n"); 1981 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1982 break; 1983 default: 1984 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1985 "due to unknown error\n"); 1986 sc_cmd->result = (DID_ERROR << 16); 1987 break; 1988 } 1989 1990 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 1991 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 1992 1993 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1994 list_del(&fsp->list); 1995 sc_cmd->SCp.ptr = NULL; 1996 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1997 sc_cmd->scsi_done(sc_cmd); 1998 1999 /* release ref from initial allocation in queue command */ 2000 fc_fcp_pkt_release(fsp); 2001} 2002 2003/** 2004 * fc_eh_abort() - Abort a command 2005 * @sc_cmd: The SCSI command to abort 2006 * 2007 * From SCSI host template. 2008 * Send an ABTS to the target device and wait for the response. 2009 */ 2010int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2011{ 2012 struct fc_fcp_pkt *fsp; 2013 struct fc_lport *lport; 2014 struct fc_fcp_internal *si; 2015 int rc = FAILED; 2016 unsigned long flags; 2017 int rval; 2018 2019 rval = fc_block_scsi_eh(sc_cmd); 2020 if (rval) 2021 return rval; 2022 2023 lport = shost_priv(sc_cmd->device->host); 2024 if (lport->state != LPORT_ST_READY) 2025 return rc; 2026 else if (!lport->link_up) 2027 return rc; 2028 2029 si = fc_get_scsi_internal(lport); 2030 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2031 fsp = CMD_SP(sc_cmd); 2032 if (!fsp) { 2033 /* command completed while scsi eh was setting up */ 2034 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2035 return SUCCESS; 2036 } 2037 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 2038 fc_fcp_pkt_hold(fsp); 2039 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2040 2041 if (fc_fcp_lock_pkt(fsp)) { 2042 /* completed while we were waiting for timer to be deleted */ 2043 rc = SUCCESS; 2044 goto release_pkt; 2045 } 2046 2047 rc = fc_fcp_pkt_abort(fsp); 2048 fc_fcp_unlock_pkt(fsp); 2049 2050release_pkt: 2051 fc_fcp_pkt_release(fsp); 2052 return rc; 2053} 2054EXPORT_SYMBOL(fc_eh_abort); 2055 2056/** 2057 * fc_eh_device_reset() - Reset a single LUN 2058 * @sc_cmd: The SCSI command which identifies the device whose 2059 * LUN is to be reset 2060 * 2061 * Set from SCSI host template. 2062 */ 2063int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2064{ 2065 struct fc_lport *lport; 2066 struct fc_fcp_pkt *fsp; 2067 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2068 int rc = FAILED; 2069 int rval; 2070 2071 rval = fc_block_scsi_eh(sc_cmd); 2072 if (rval) 2073 return rval; 2074 2075 lport = shost_priv(sc_cmd->device->host); 2076 2077 if (lport->state != LPORT_ST_READY) 2078 return rc; 2079 2080 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2081 2082 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2083 if (fsp == NULL) { 2084 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2085 goto out; 2086 } 2087 2088 /* 2089 * Build the libfc request pkt. Do not set the scsi cmnd, because 2090 * the sc passed in is not setup for execution like when sent 2091 * through the queuecommand callout. 2092 */ 2093 fsp->rport = rport; /* set the remote port ptr */ 2094 2095 /* 2096 * flush outstanding commands 2097 */ 2098 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2099 fsp->state = FC_SRB_FREE; 2100 fc_fcp_pkt_release(fsp); 2101 2102out: 2103 return rc; 2104} 2105EXPORT_SYMBOL(fc_eh_device_reset); 2106 2107/** 2108 * fc_eh_host_reset() - Reset a Scsi_Host. 2109 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2110 */ 2111int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2112{ 2113 struct Scsi_Host *shost = sc_cmd->device->host; 2114 struct fc_lport *lport = shost_priv(shost); 2115 unsigned long wait_tmo; 2116 2117 FC_SCSI_DBG(lport, "Resetting host\n"); 2118 2119 fc_block_scsi_eh(sc_cmd); 2120 2121 lport->tt.lport_reset(lport); 2122 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2123 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2124 wait_tmo)) 2125 msleep(1000); 2126 2127 if (fc_fcp_lport_queue_ready(lport)) { 2128 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2129 "on port (%6.6x)\n", lport->port_id); 2130 return SUCCESS; 2131 } else { 2132 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2133 "port (%6.6x) is not ready.\n", 2134 lport->port_id); 2135 return FAILED; 2136 } 2137} 2138EXPORT_SYMBOL(fc_eh_host_reset); 2139 2140/** 2141 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2142 * @sdev: The SCSI device that identifies the SCSI host 2143 * 2144 * Configures queue depth based on host's cmd_per_len. If not set 2145 * then we use the libfc default. 2146 */ 2147int fc_slave_alloc(struct scsi_device *sdev) 2148{ 2149 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2150 2151 if (!rport || fc_remote_port_chkready(rport)) 2152 return -ENXIO; 2153 2154 if (sdev->tagged_supported) 2155 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2156 else 2157 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2158 FC_FCP_DFLT_QUEUE_DEPTH); 2159 2160 return 0; 2161} 2162EXPORT_SYMBOL(fc_slave_alloc); 2163 2164/** 2165 * fc_change_queue_depth() - Change a device's queue depth 2166 * @sdev: The SCSI device whose queue depth is to change 2167 * @qdepth: The new queue depth 2168 * @reason: The resason for the change 2169 */ 2170int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2171{ 2172 switch (reason) { 2173 case SCSI_QDEPTH_DEFAULT: 2174 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2175 break; 2176 case SCSI_QDEPTH_QFULL: 2177 scsi_track_queue_full(sdev, qdepth); 2178 break; 2179 case SCSI_QDEPTH_RAMP_UP: 2180 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2181 break; 2182 default: 2183 return -EOPNOTSUPP; 2184 } 2185 return sdev->queue_depth; 2186} 2187EXPORT_SYMBOL(fc_change_queue_depth); 2188 2189/** 2190 * fc_change_queue_type() - Change a device's queue type 2191 * @sdev: The SCSI device whose queue depth is to change 2192 * @tag_type: Identifier for queue type 2193 */ 2194int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2195{ 2196 if (sdev->tagged_supported) { 2197 scsi_set_tag_type(sdev, tag_type); 2198 if (tag_type) 2199 scsi_activate_tcq(sdev, sdev->queue_depth); 2200 else 2201 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2202 } else 2203 tag_type = 0; 2204 2205 return tag_type; 2206} 2207EXPORT_SYMBOL(fc_change_queue_type); 2208 2209/** 2210 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2211 * @lport: The local port that no longer needs the FCP layer 2212 */ 2213void fc_fcp_destroy(struct fc_lport *lport) 2214{ 2215 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2216 2217 if (!list_empty(&si->scsi_pkt_queue)) 2218 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2219 "port (%6.6x)\n", lport->port_id); 2220 2221 mempool_destroy(si->scsi_pkt_pool); 2222 kfree(si); 2223 lport->scsi_priv = NULL; 2224} 2225EXPORT_SYMBOL(fc_fcp_destroy); 2226 2227int fc_setup_fcp(void) 2228{ 2229 int rc = 0; 2230 2231 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2232 sizeof(struct fc_fcp_pkt), 2233 0, SLAB_HWCACHE_ALIGN, NULL); 2234 if (!scsi_pkt_cachep) { 2235 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2236 "module load failed!"); 2237 rc = -ENOMEM; 2238 } 2239 2240 return rc; 2241} 2242 2243void fc_destroy_fcp(void) 2244{ 2245 if (scsi_pkt_cachep) 2246 kmem_cache_destroy(scsi_pkt_cachep); 2247} 2248 2249/** 2250 * fc_fcp_init() - Initialize the FCP layer for a local port 2251 * @lport: The local port to initialize the exchange layer for 2252 */ 2253int fc_fcp_init(struct fc_lport *lport) 2254{ 2255 int rc; 2256 struct fc_fcp_internal *si; 2257 2258 if (!lport->tt.fcp_cmd_send) 2259 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2260 2261 if (!lport->tt.fcp_cleanup) 2262 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2263 2264 if (!lport->tt.fcp_abort_io) 2265 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2266 2267 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2268 if (!si) 2269 return -ENOMEM; 2270 lport->scsi_priv = si; 2271 si->max_can_queue = lport->host->can_queue; 2272 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2273 spin_lock_init(&si->scsi_queue_lock); 2274 2275 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2276 if (!si->scsi_pkt_pool) { 2277 rc = -ENOMEM; 2278 goto free_internal; 2279 } 2280 return 0; 2281 2282free_internal: 2283 kfree(si); 2284 return rc; 2285} 2286EXPORT_SYMBOL(fc_fcp_init); 2287