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