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_destory() - 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 if (!fc_fcp_lock_pkt(fsp)) { 1043 fc_fcp_cleanup_cmd(fsp, error); 1044 fc_io_compl(fsp); 1045 fc_fcp_unlock_pkt(fsp); 1046 } 1047 1048 fc_fcp_pkt_release(fsp); 1049 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1050 /* 1051 * while we dropped the lock multiple pkts could 1052 * have been released, so we have to start over. 1053 */ 1054 goto restart; 1055 } 1056 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1057} 1058 1059/** 1060 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1061 * @lport: The local port whose exchanges are to be aborted 1062 */ 1063static void fc_fcp_abort_io(struct fc_lport *lport) 1064{ 1065 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1066} 1067 1068/** 1069 * fc_fcp_pkt_send() - Send a fcp_pkt 1070 * @lport: The local port to send the FCP packet on 1071 * @fsp: The FCP packet to send 1072 * 1073 * Return: Zero for success and -1 for failure 1074 * Locks: Called without locks held 1075 */ 1076static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1077{ 1078 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1079 unsigned long flags; 1080 int rc; 1081 1082 fsp->cmd->SCp.ptr = (char *)fsp; 1083 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1084 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1085 1086 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1087 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1088 1089 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1090 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1091 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1092 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1093 if (unlikely(rc)) { 1094 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1095 fsp->cmd->SCp.ptr = NULL; 1096 list_del(&fsp->list); 1097 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1098 } 1099 1100 return rc; 1101} 1102 1103/** 1104 * get_fsp_rec_tov() - Helper function to get REC_TOV 1105 * @fsp: the FCP packet 1106 * 1107 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 1108 */ 1109static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 1110{ 1111 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 1112 1113 return msecs_to_jiffies(rpriv->e_d_tov) + HZ; 1114} 1115 1116/** 1117 * fc_fcp_cmd_send() - Send a FCP command 1118 * @lport: The local port to send the command on 1119 * @fsp: The FCP packet the command is on 1120 * @resp: The handler for the response 1121 */ 1122static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1123 void (*resp)(struct fc_seq *, 1124 struct fc_frame *fp, 1125 void *arg)) 1126{ 1127 struct fc_frame *fp; 1128 struct fc_seq *seq; 1129 struct fc_rport *rport; 1130 struct fc_rport_libfc_priv *rpriv; 1131 const size_t len = sizeof(fsp->cdb_cmd); 1132 int rc = 0; 1133 1134 if (fc_fcp_lock_pkt(fsp)) 1135 return 0; 1136 1137 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1138 if (!fp) { 1139 rc = -1; 1140 goto unlock; 1141 } 1142 1143 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1144 fr_fsp(fp) = fsp; 1145 rport = fsp->rport; 1146 fsp->max_payload = rport->maxframe_size; 1147 rpriv = rport->dd_data; 1148 1149 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1150 rpriv->local_port->port_id, FC_TYPE_FCP, 1151 FC_FCTL_REQ, 0); 1152 1153 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1154 fsp, 0); 1155 if (!seq) { 1156 rc = -1; 1157 goto unlock; 1158 } 1159 fsp->seq_ptr = seq; 1160 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1161 1162 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1163 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1164 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1165 1166unlock: 1167 fc_fcp_unlock_pkt(fsp); 1168 return rc; 1169} 1170 1171/** 1172 * fc_fcp_error() - Handler for FCP layer errors 1173 * @fsp: The FCP packet the error is on 1174 * @fp: The frame that has errored 1175 */ 1176static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1177{ 1178 int error = PTR_ERR(fp); 1179 1180 if (fc_fcp_lock_pkt(fsp)) 1181 return; 1182 1183 if (error == -FC_EX_CLOSED) { 1184 fc_fcp_retry_cmd(fsp); 1185 goto unlock; 1186 } 1187 1188 /* 1189 * clear abort pending, because the lower layer 1190 * decided to force completion. 1191 */ 1192 fsp->state &= ~FC_SRB_ABORT_PENDING; 1193 fsp->status_code = FC_CMD_PLOGO; 1194 fc_fcp_complete_locked(fsp); 1195unlock: 1196 fc_fcp_unlock_pkt(fsp); 1197} 1198 1199/** 1200 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1201 * @fsp: The FCP packet to abort on 1202 * 1203 * Called to send an abort and then wait for abort completion 1204 */ 1205static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1206{ 1207 int rc = FAILED; 1208 unsigned long ticks_left; 1209 1210 if (fc_fcp_send_abort(fsp)) 1211 return FAILED; 1212 1213 init_completion(&fsp->tm_done); 1214 fsp->wait_for_comp = 1; 1215 1216 spin_unlock_bh(&fsp->scsi_pkt_lock); 1217 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1218 FC_SCSI_TM_TOV); 1219 spin_lock_bh(&fsp->scsi_pkt_lock); 1220 fsp->wait_for_comp = 0; 1221 1222 if (!ticks_left) { 1223 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1224 } else if (fsp->state & FC_SRB_ABORTED) { 1225 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1226 rc = SUCCESS; 1227 fc_fcp_complete_locked(fsp); 1228 } 1229 1230 return rc; 1231} 1232 1233/** 1234 * fc_lun_reset_send() - Send LUN reset command 1235 * @data: The FCP packet that identifies the LUN to be reset 1236 */ 1237static void fc_lun_reset_send(unsigned long data) 1238{ 1239 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1240 struct fc_lport *lport = fsp->lp; 1241 1242 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1243 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1244 return; 1245 if (fc_fcp_lock_pkt(fsp)) 1246 return; 1247 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1248 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1249 fc_fcp_unlock_pkt(fsp); 1250 } 1251} 1252 1253/** 1254 * fc_lun_reset() - Send a LUN RESET command to a device 1255 * and wait for the reply 1256 * @lport: The local port to sent the command on 1257 * @fsp: The FCP packet that identifies the LUN to be reset 1258 * @id: The SCSI command ID 1259 * @lun: The LUN ID to be reset 1260 */ 1261static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1262 unsigned int id, unsigned int lun) 1263{ 1264 int rc; 1265 1266 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1267 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1268 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1269 1270 fsp->wait_for_comp = 1; 1271 init_completion(&fsp->tm_done); 1272 1273 fc_lun_reset_send((unsigned long)fsp); 1274 1275 /* 1276 * wait for completion of reset 1277 * after that make sure all commands are terminated 1278 */ 1279 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1280 1281 spin_lock_bh(&fsp->scsi_pkt_lock); 1282 fsp->state |= FC_SRB_COMPL; 1283 spin_unlock_bh(&fsp->scsi_pkt_lock); 1284 1285 del_timer_sync(&fsp->timer); 1286 1287 spin_lock_bh(&fsp->scsi_pkt_lock); 1288 if (fsp->seq_ptr) { 1289 lport->tt.exch_done(fsp->seq_ptr); 1290 fsp->seq_ptr = NULL; 1291 } 1292 fsp->wait_for_comp = 0; 1293 spin_unlock_bh(&fsp->scsi_pkt_lock); 1294 1295 if (!rc) { 1296 FC_SCSI_DBG(lport, "lun reset failed\n"); 1297 return FAILED; 1298 } 1299 1300 /* cdb_status holds the tmf's rsp code */ 1301 if (fsp->cdb_status != FCP_TMF_CMPL) 1302 return FAILED; 1303 1304 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1305 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1306 return SUCCESS; 1307} 1308 1309/** 1310 * fc_tm_done() - Task Management response handler 1311 * @seq: The sequence that the response is on 1312 * @fp: The response frame 1313 * @arg: The FCP packet the response is for 1314 */ 1315static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1316{ 1317 struct fc_fcp_pkt *fsp = arg; 1318 struct fc_frame_header *fh; 1319 1320 if (IS_ERR(fp)) { 1321 /* 1322 * If there is an error just let it timeout or wait 1323 * for TMF to be aborted if it timedout. 1324 * 1325 * scsi-eh will escalate for when either happens. 1326 */ 1327 return; 1328 } 1329 1330 if (fc_fcp_lock_pkt(fsp)) 1331 goto out; 1332 1333 /* 1334 * raced with eh timeout handler. 1335 */ 1336 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1337 goto out_unlock; 1338 1339 fh = fc_frame_header_get(fp); 1340 if (fh->fh_type != FC_TYPE_BLS) 1341 fc_fcp_resp(fsp, fp); 1342 fsp->seq_ptr = NULL; 1343 fsp->lp->tt.exch_done(seq); 1344out_unlock: 1345 fc_fcp_unlock_pkt(fsp); 1346out: 1347 fc_frame_free(fp); 1348} 1349 1350/** 1351 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1352 * @lport: The local port to be cleaned up 1353 */ 1354static void fc_fcp_cleanup(struct fc_lport *lport) 1355{ 1356 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1357} 1358 1359/** 1360 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1361 * @data: The FCP packet that has timed out 1362 * 1363 * If REC is supported then just issue it and return. The REC exchange will 1364 * complete or time out and recovery can continue at that point. Otherwise, 1365 * if the response has been received without all the data it has been 1366 * ER_TIMEOUT since the response was received. If the response has not been 1367 * received we see if data was received recently. If it has been then we 1368 * continue waiting, otherwise, we abort the command. 1369 */ 1370static void fc_fcp_timeout(unsigned long data) 1371{ 1372 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1373 struct fc_rport *rport = fsp->rport; 1374 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1375 1376 if (fc_fcp_lock_pkt(fsp)) 1377 return; 1378 1379 if (fsp->cdb_cmd.fc_tm_flags) 1380 goto unlock; 1381 1382 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1383 1384 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1385 fc_fcp_rec(fsp); 1386 else if (fsp->state & FC_SRB_RCV_STATUS) 1387 fc_fcp_complete_locked(fsp); 1388 else 1389 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1390 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1391unlock: 1392 fc_fcp_unlock_pkt(fsp); 1393} 1394 1395/** 1396 * fc_fcp_rec() - Send a REC ELS request 1397 * @fsp: The FCP packet to send the REC request on 1398 */ 1399static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1400{ 1401 struct fc_lport *lport; 1402 struct fc_frame *fp; 1403 struct fc_rport *rport; 1404 struct fc_rport_libfc_priv *rpriv; 1405 1406 lport = fsp->lp; 1407 rport = fsp->rport; 1408 rpriv = rport->dd_data; 1409 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1410 fsp->status_code = FC_HRD_ERROR; 1411 fsp->io_status = 0; 1412 fc_fcp_complete_locked(fsp); 1413 return; 1414 } 1415 1416 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1417 if (!fp) 1418 goto retry; 1419 1420 fr_seq(fp) = fsp->seq_ptr; 1421 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1422 rpriv->local_port->port_id, FC_TYPE_ELS, 1423 FC_FCTL_REQ, 0); 1424 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1425 fc_fcp_rec_resp, fsp, 1426 2 * lport->r_a_tov)) { 1427 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1428 return; 1429 } 1430retry: 1431 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1432 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1433 else 1434 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1435} 1436 1437/** 1438 * fc_fcp_rec_resp() - Handler for REC ELS responses 1439 * @seq: The sequence the response is on 1440 * @fp: The response frame 1441 * @arg: The FCP packet the response is on 1442 * 1443 * If the response is a reject then the scsi layer will handle 1444 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1445 * set the timeout and return. If the I/O was completed then complete the 1446 * exchange and tell the SCSI layer. 1447 */ 1448static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1449{ 1450 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1451 struct fc_els_rec_acc *recp; 1452 struct fc_els_ls_rjt *rjt; 1453 u32 e_stat; 1454 u8 opcode; 1455 u32 offset; 1456 enum dma_data_direction data_dir; 1457 enum fc_rctl r_ctl; 1458 struct fc_rport_libfc_priv *rpriv; 1459 1460 if (IS_ERR(fp)) { 1461 fc_fcp_rec_error(fsp, fp); 1462 return; 1463 } 1464 1465 if (fc_fcp_lock_pkt(fsp)) 1466 goto out; 1467 1468 fsp->recov_retry = 0; 1469 opcode = fc_frame_payload_op(fp); 1470 if (opcode == ELS_LS_RJT) { 1471 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1472 switch (rjt->er_reason) { 1473 default: 1474 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1475 "reason %d expl %d\n", 1476 fsp->rport->port_id, rjt->er_reason, 1477 rjt->er_explan); 1478 /* fall through */ 1479 case ELS_RJT_UNSUP: 1480 FC_FCP_DBG(fsp, "device does not support REC\n"); 1481 rpriv = fsp->rport->dd_data; 1482 /* 1483 * if we do not spport RECs or got some bogus 1484 * reason then resetup timer so we check for 1485 * making progress. 1486 */ 1487 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1488 break; 1489 case ELS_RJT_LOGIC: 1490 case ELS_RJT_UNAB: 1491 /* 1492 * If no data transfer, the command frame got dropped 1493 * so we just retry. If data was transferred, we 1494 * lost the response but the target has no record, 1495 * so we abort and retry. 1496 */ 1497 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1498 fsp->xfer_len == 0) { 1499 fc_fcp_retry_cmd(fsp); 1500 break; 1501 } 1502 fc_fcp_recovery(fsp, FC_ERROR); 1503 break; 1504 } 1505 } else if (opcode == ELS_LS_ACC) { 1506 if (fsp->state & FC_SRB_ABORTED) 1507 goto unlock_out; 1508 1509 data_dir = fsp->cmd->sc_data_direction; 1510 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1511 offset = ntohl(recp->reca_fc4value); 1512 e_stat = ntohl(recp->reca_e_stat); 1513 1514 if (e_stat & ESB_ST_COMPLETE) { 1515 1516 /* 1517 * The exchange is complete. 1518 * 1519 * For output, we must've lost the response. 1520 * For input, all data must've been sent. 1521 * We lost may have lost the response 1522 * (and a confirmation was requested) and maybe 1523 * some data. 1524 * 1525 * If all data received, send SRR 1526 * asking for response. If partial data received, 1527 * or gaps, SRR requests data at start of gap. 1528 * Recovery via SRR relies on in-order-delivery. 1529 */ 1530 if (data_dir == DMA_TO_DEVICE) { 1531 r_ctl = FC_RCTL_DD_CMD_STATUS; 1532 } else if (fsp->xfer_contig_end == offset) { 1533 r_ctl = FC_RCTL_DD_CMD_STATUS; 1534 } else { 1535 offset = fsp->xfer_contig_end; 1536 r_ctl = FC_RCTL_DD_SOL_DATA; 1537 } 1538 fc_fcp_srr(fsp, r_ctl, offset); 1539 } else if (e_stat & ESB_ST_SEQ_INIT) { 1540 /* 1541 * The remote port has the initiative, so just 1542 * keep waiting for it to complete. 1543 */ 1544 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1545 } else { 1546 1547 /* 1548 * The exchange is incomplete, we have seq. initiative. 1549 * Lost response with requested confirmation, 1550 * lost confirmation, lost transfer ready or 1551 * lost write data. 1552 * 1553 * For output, if not all data was received, ask 1554 * for transfer ready to be repeated. 1555 * 1556 * If we received or sent all the data, send SRR to 1557 * request response. 1558 * 1559 * If we lost a response, we may have lost some read 1560 * data as well. 1561 */ 1562 r_ctl = FC_RCTL_DD_SOL_DATA; 1563 if (data_dir == DMA_TO_DEVICE) { 1564 r_ctl = FC_RCTL_DD_CMD_STATUS; 1565 if (offset < fsp->data_len) 1566 r_ctl = FC_RCTL_DD_DATA_DESC; 1567 } else if (offset == fsp->xfer_contig_end) { 1568 r_ctl = FC_RCTL_DD_CMD_STATUS; 1569 } else if (fsp->xfer_contig_end < offset) { 1570 offset = fsp->xfer_contig_end; 1571 } 1572 fc_fcp_srr(fsp, r_ctl, offset); 1573 } 1574 } 1575unlock_out: 1576 fc_fcp_unlock_pkt(fsp); 1577out: 1578 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1579 fc_frame_free(fp); 1580} 1581 1582/** 1583 * fc_fcp_rec_error() - Handler for REC errors 1584 * @fsp: The FCP packet the error is on 1585 * @fp: The REC frame 1586 */ 1587static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1588{ 1589 int error = PTR_ERR(fp); 1590 1591 if (fc_fcp_lock_pkt(fsp)) 1592 goto out; 1593 1594 switch (error) { 1595 case -FC_EX_CLOSED: 1596 fc_fcp_retry_cmd(fsp); 1597 break; 1598 1599 default: 1600 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1601 fsp, fsp->rport->port_id, error); 1602 fsp->status_code = FC_CMD_PLOGO; 1603 /* fall through */ 1604 1605 case -FC_EX_TIMEOUT: 1606 /* 1607 * Assume REC or LS_ACC was lost. 1608 * The exchange manager will have aborted REC, so retry. 1609 */ 1610 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", 1611 fsp->rport->port_id, error, fsp->recov_retry, 1612 FC_MAX_RECOV_RETRY); 1613 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1614 fc_fcp_rec(fsp); 1615 else 1616 fc_fcp_recovery(fsp, FC_ERROR); 1617 break; 1618 } 1619 fc_fcp_unlock_pkt(fsp); 1620out: 1621 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1622} 1623 1624/** 1625 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1626 * @fsp: The FCP pkt that needs to be aborted 1627 */ 1628static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1629{ 1630 fsp->status_code = code; 1631 fsp->cdb_status = 0; 1632 fsp->io_status = 0; 1633 /* 1634 * if this fails then we let the scsi command timer fire and 1635 * scsi-ml escalate. 1636 */ 1637 fc_fcp_send_abort(fsp); 1638} 1639 1640/** 1641 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1642 * @fsp: The FCP packet the SRR is to be sent on 1643 * @r_ctl: The R_CTL field for the SRR request 1644 * This is called after receiving status but insufficient data, or 1645 * when expecting status but the request has timed out. 1646 */ 1647static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1648{ 1649 struct fc_lport *lport = fsp->lp; 1650 struct fc_rport *rport; 1651 struct fc_rport_libfc_priv *rpriv; 1652 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1653 struct fc_seq *seq; 1654 struct fcp_srr *srr; 1655 struct fc_frame *fp; 1656 unsigned int rec_tov; 1657 1658 rport = fsp->rport; 1659 rpriv = rport->dd_data; 1660 1661 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1662 rpriv->rp_state != RPORT_ST_READY) 1663 goto retry; /* shouldn't happen */ 1664 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1665 if (!fp) 1666 goto retry; 1667 1668 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1669 memset(srr, 0, sizeof(*srr)); 1670 srr->srr_op = ELS_SRR; 1671 srr->srr_ox_id = htons(ep->oxid); 1672 srr->srr_rx_id = htons(ep->rxid); 1673 srr->srr_r_ctl = r_ctl; 1674 srr->srr_rel_off = htonl(offset); 1675 1676 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1677 rpriv->local_port->port_id, FC_TYPE_FCP, 1678 FC_FCTL_REQ, 0); 1679 1680 rec_tov = get_fsp_rec_tov(fsp); 1681 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, 1682 fc_fcp_pkt_destroy, 1683 fsp, jiffies_to_msecs(rec_tov)); 1684 if (!seq) 1685 goto retry; 1686 1687 fsp->recov_seq = seq; 1688 fsp->xfer_len = offset; 1689 fsp->xfer_contig_end = offset; 1690 fsp->state &= ~FC_SRB_RCV_STATUS; 1691 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1692 return; 1693retry: 1694 fc_fcp_retry_cmd(fsp); 1695} 1696 1697/** 1698 * fc_fcp_srr_resp() - Handler for SRR response 1699 * @seq: The sequence the SRR is on 1700 * @fp: The SRR frame 1701 * @arg: The FCP packet the SRR is on 1702 */ 1703static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1704{ 1705 struct fc_fcp_pkt *fsp = arg; 1706 struct fc_frame_header *fh; 1707 1708 if (IS_ERR(fp)) { 1709 fc_fcp_srr_error(fsp, fp); 1710 return; 1711 } 1712 1713 if (fc_fcp_lock_pkt(fsp)) 1714 goto out; 1715 1716 fh = fc_frame_header_get(fp); 1717 /* 1718 * BUG? fc_fcp_srr_error calls exch_done which would release 1719 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1720 * then fc_exch_timeout would be sending an abort. The exch_done 1721 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1722 * an abort response though. 1723 */ 1724 if (fh->fh_type == FC_TYPE_BLS) { 1725 fc_fcp_unlock_pkt(fsp); 1726 return; 1727 } 1728 1729 switch (fc_frame_payload_op(fp)) { 1730 case ELS_LS_ACC: 1731 fsp->recov_retry = 0; 1732 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1733 break; 1734 case ELS_LS_RJT: 1735 default: 1736 fc_fcp_recovery(fsp, FC_ERROR); 1737 break; 1738 } 1739 fc_fcp_unlock_pkt(fsp); 1740out: 1741 fsp->lp->tt.exch_done(seq); 1742 fc_frame_free(fp); 1743} 1744 1745/** 1746 * fc_fcp_srr_error() - Handler for SRR errors 1747 * @fsp: The FCP packet that the SRR error is on 1748 * @fp: The SRR frame 1749 */ 1750static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1751{ 1752 if (fc_fcp_lock_pkt(fsp)) 1753 goto out; 1754 switch (PTR_ERR(fp)) { 1755 case -FC_EX_TIMEOUT: 1756 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1757 fc_fcp_rec(fsp); 1758 else 1759 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1760 break; 1761 case -FC_EX_CLOSED: /* e.g., link failure */ 1762 /* fall through */ 1763 default: 1764 fc_fcp_retry_cmd(fsp); 1765 break; 1766 } 1767 fc_fcp_unlock_pkt(fsp); 1768out: 1769 fsp->lp->tt.exch_done(fsp->recov_seq); 1770} 1771 1772/** 1773 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1774 * @lport: The local port to be checked 1775 */ 1776static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1777{ 1778 /* lock ? */ 1779 return (lport->state == LPORT_ST_READY) && 1780 lport->link_up && !lport->qfull; 1781} 1782 1783/** 1784 * fc_queuecommand() - The queuecommand function of the SCSI template 1785 * @shost: The Scsi_Host that the command was issued to 1786 * @cmd: The scsi_cmnd to be executed 1787 * 1788 * This is the i/o strategy routine, called by the SCSI layer. 1789 */ 1790int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1791{ 1792 struct fc_lport *lport = shost_priv(shost); 1793 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1794 struct fc_fcp_pkt *fsp; 1795 struct fc_rport_libfc_priv *rpriv; 1796 int rval; 1797 int rc = 0; 1798 struct fc_stats *stats; 1799 1800 rval = fc_remote_port_chkready(rport); 1801 if (rval) { 1802 sc_cmd->result = rval; 1803 sc_cmd->scsi_done(sc_cmd); 1804 return 0; 1805 } 1806 1807 if (!*(struct fc_remote_port **)rport->dd_data) { 1808 /* 1809 * rport is transitioning from blocked/deleted to 1810 * online 1811 */ 1812 sc_cmd->result = DID_IMM_RETRY << 16; 1813 sc_cmd->scsi_done(sc_cmd); 1814 goto out; 1815 } 1816 1817 rpriv = rport->dd_data; 1818 1819 if (!fc_fcp_lport_queue_ready(lport)) { 1820 if (lport->qfull) 1821 fc_fcp_can_queue_ramp_down(lport); 1822 rc = SCSI_MLQUEUE_HOST_BUSY; 1823 goto out; 1824 } 1825 1826 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1827 if (fsp == NULL) { 1828 rc = SCSI_MLQUEUE_HOST_BUSY; 1829 goto out; 1830 } 1831 1832 /* 1833 * build the libfc request pkt 1834 */ 1835 fsp->cmd = sc_cmd; /* save the cmd */ 1836 fsp->rport = rport; /* set the remote port ptr */ 1837 1838 /* 1839 * set up the transfer length 1840 */ 1841 fsp->data_len = scsi_bufflen(sc_cmd); 1842 fsp->xfer_len = 0; 1843 1844 /* 1845 * setup the data direction 1846 */ 1847 stats = per_cpu_ptr(lport->stats, get_cpu()); 1848 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1849 fsp->req_flags = FC_SRB_READ; 1850 stats->InputRequests++; 1851 stats->InputBytes += fsp->data_len; 1852 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1853 fsp->req_flags = FC_SRB_WRITE; 1854 stats->OutputRequests++; 1855 stats->OutputBytes += fsp->data_len; 1856 } else { 1857 fsp->req_flags = 0; 1858 stats->ControlRequests++; 1859 } 1860 put_cpu(); 1861 1862 /* 1863 * send it to the lower layer 1864 * if we get -1 return then put the request in the pending 1865 * queue. 1866 */ 1867 rval = fc_fcp_pkt_send(lport, fsp); 1868 if (rval != 0) { 1869 fsp->state = FC_SRB_FREE; 1870 fc_fcp_pkt_release(fsp); 1871 rc = SCSI_MLQUEUE_HOST_BUSY; 1872 } 1873out: 1874 return rc; 1875} 1876EXPORT_SYMBOL(fc_queuecommand); 1877 1878/** 1879 * fc_io_compl() - Handle responses for completed commands 1880 * @fsp: The FCP packet that is complete 1881 * 1882 * Translates fcp_pkt errors to a Linux SCSI errors. 1883 * The fcp packet lock must be held when calling. 1884 */ 1885static void fc_io_compl(struct fc_fcp_pkt *fsp) 1886{ 1887 struct fc_fcp_internal *si; 1888 struct scsi_cmnd *sc_cmd; 1889 struct fc_lport *lport; 1890 unsigned long flags; 1891 1892 /* release outstanding ddp context */ 1893 fc_fcp_ddp_done(fsp); 1894 1895 fsp->state |= FC_SRB_COMPL; 1896 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1897 spin_unlock_bh(&fsp->scsi_pkt_lock); 1898 del_timer_sync(&fsp->timer); 1899 spin_lock_bh(&fsp->scsi_pkt_lock); 1900 } 1901 1902 lport = fsp->lp; 1903 si = fc_get_scsi_internal(lport); 1904 1905 /* 1906 * if can_queue ramp down is done then try can_queue ramp up 1907 * since commands are completing now. 1908 */ 1909 if (si->last_can_queue_ramp_down_time) 1910 fc_fcp_can_queue_ramp_up(lport); 1911 1912 sc_cmd = fsp->cmd; 1913 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1914 switch (fsp->status_code) { 1915 case FC_COMPLETE: 1916 if (fsp->cdb_status == 0) { 1917 /* 1918 * good I/O status 1919 */ 1920 sc_cmd->result = DID_OK << 16; 1921 if (fsp->scsi_resid) 1922 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1923 } else { 1924 /* 1925 * transport level I/O was ok but scsi 1926 * has non zero status 1927 */ 1928 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1929 } 1930 break; 1931 case FC_ERROR: 1932 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1933 "due to FC_ERROR\n"); 1934 sc_cmd->result = DID_ERROR << 16; 1935 break; 1936 case FC_DATA_UNDRUN: 1937 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1938 /* 1939 * scsi status is good but transport level 1940 * underrun. 1941 */ 1942 if (fsp->state & FC_SRB_RCV_STATUS) { 1943 sc_cmd->result = DID_OK << 16; 1944 } else { 1945 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 1946 " due to FC_DATA_UNDRUN (trans)\n"); 1947 sc_cmd->result = DID_ERROR << 16; 1948 } 1949 } else { 1950 /* 1951 * scsi got underrun, this is an error 1952 */ 1953 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1954 "due to FC_DATA_UNDRUN (scsi)\n"); 1955 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1956 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1957 } 1958 break; 1959 case FC_DATA_OVRRUN: 1960 /* 1961 * overrun is an error 1962 */ 1963 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1964 "due to FC_DATA_OVRRUN\n"); 1965 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1966 break; 1967 case FC_CMD_ABORTED: 1968 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1969 "due to FC_CMD_ABORTED\n"); 1970 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1971 break; 1972 case FC_CMD_RESET: 1973 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 1974 "due to FC_CMD_RESET\n"); 1975 sc_cmd->result = (DID_RESET << 16); 1976 break; 1977 case FC_HRD_ERROR: 1978 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 1979 "due to FC_HRD_ERROR\n"); 1980 sc_cmd->result = (DID_NO_CONNECT << 16); 1981 break; 1982 case FC_CRC_ERROR: 1983 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 1984 "due to FC_CRC_ERROR\n"); 1985 sc_cmd->result = (DID_PARITY << 16); 1986 break; 1987 case FC_TIMED_OUT: 1988 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 1989 "due to FC_TIMED_OUT\n"); 1990 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1991 break; 1992 default: 1993 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1994 "due to unknown error\n"); 1995 sc_cmd->result = (DID_ERROR << 16); 1996 break; 1997 } 1998 1999 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 2000 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2001 2002 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2003 list_del(&fsp->list); 2004 sc_cmd->SCp.ptr = NULL; 2005 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2006 sc_cmd->scsi_done(sc_cmd); 2007 2008 /* release ref from initial allocation in queue command */ 2009 fc_fcp_pkt_release(fsp); 2010} 2011 2012/** 2013 * fc_eh_abort() - Abort a command 2014 * @sc_cmd: The SCSI command to abort 2015 * 2016 * From SCSI host template. 2017 * Send an ABTS to the target device and wait for the response. 2018 */ 2019int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2020{ 2021 struct fc_fcp_pkt *fsp; 2022 struct fc_lport *lport; 2023 struct fc_fcp_internal *si; 2024 int rc = FAILED; 2025 unsigned long flags; 2026 int rval; 2027 2028 rval = fc_block_scsi_eh(sc_cmd); 2029 if (rval) 2030 return rval; 2031 2032 lport = shost_priv(sc_cmd->device->host); 2033 if (lport->state != LPORT_ST_READY) 2034 return rc; 2035 else if (!lport->link_up) 2036 return rc; 2037 2038 si = fc_get_scsi_internal(lport); 2039 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2040 fsp = CMD_SP(sc_cmd); 2041 if (!fsp) { 2042 /* command completed while scsi eh was setting up */ 2043 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2044 return SUCCESS; 2045 } 2046 /* grab a ref so the fsp and sc_cmd cannot be released from under us */ 2047 fc_fcp_pkt_hold(fsp); 2048 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2049 2050 if (fc_fcp_lock_pkt(fsp)) { 2051 /* completed while we were waiting for timer to be deleted */ 2052 rc = SUCCESS; 2053 goto release_pkt; 2054 } 2055 2056 rc = fc_fcp_pkt_abort(fsp); 2057 fc_fcp_unlock_pkt(fsp); 2058 2059release_pkt: 2060 fc_fcp_pkt_release(fsp); 2061 return rc; 2062} 2063EXPORT_SYMBOL(fc_eh_abort); 2064 2065/** 2066 * fc_eh_device_reset() - Reset a single LUN 2067 * @sc_cmd: The SCSI command which identifies the device whose 2068 * LUN is to be reset 2069 * 2070 * Set from SCSI host template. 2071 */ 2072int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2073{ 2074 struct fc_lport *lport; 2075 struct fc_fcp_pkt *fsp; 2076 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2077 int rc = FAILED; 2078 int rval; 2079 2080 rval = fc_block_scsi_eh(sc_cmd); 2081 if (rval) 2082 return rval; 2083 2084 lport = shost_priv(sc_cmd->device->host); 2085 2086 if (lport->state != LPORT_ST_READY) 2087 return rc; 2088 2089 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2090 2091 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2092 if (fsp == NULL) { 2093 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2094 goto out; 2095 } 2096 2097 /* 2098 * Build the libfc request pkt. Do not set the scsi cmnd, because 2099 * the sc passed in is not setup for execution like when sent 2100 * through the queuecommand callout. 2101 */ 2102 fsp->rport = rport; /* set the remote port ptr */ 2103 2104 /* 2105 * flush outstanding commands 2106 */ 2107 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2108 fsp->state = FC_SRB_FREE; 2109 fc_fcp_pkt_release(fsp); 2110 2111out: 2112 return rc; 2113} 2114EXPORT_SYMBOL(fc_eh_device_reset); 2115 2116/** 2117 * fc_eh_host_reset() - Reset a Scsi_Host. 2118 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2119 */ 2120int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2121{ 2122 struct Scsi_Host *shost = sc_cmd->device->host; 2123 struct fc_lport *lport = shost_priv(shost); 2124 unsigned long wait_tmo; 2125 2126 FC_SCSI_DBG(lport, "Resetting host\n"); 2127 2128 fc_block_scsi_eh(sc_cmd); 2129 2130 lport->tt.lport_reset(lport); 2131 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2132 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2133 wait_tmo)) 2134 msleep(1000); 2135 2136 if (fc_fcp_lport_queue_ready(lport)) { 2137 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2138 "on port (%6.6x)\n", lport->port_id); 2139 return SUCCESS; 2140 } else { 2141 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2142 "port (%6.6x) is not ready.\n", 2143 lport->port_id); 2144 return FAILED; 2145 } 2146} 2147EXPORT_SYMBOL(fc_eh_host_reset); 2148 2149/** 2150 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2151 * @sdev: The SCSI device that identifies the SCSI host 2152 * 2153 * Configures queue depth based on host's cmd_per_len. If not set 2154 * then we use the libfc default. 2155 */ 2156int fc_slave_alloc(struct scsi_device *sdev) 2157{ 2158 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2159 2160 if (!rport || fc_remote_port_chkready(rport)) 2161 return -ENXIO; 2162 2163 if (sdev->tagged_supported) 2164 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2165 else 2166 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2167 FC_FCP_DFLT_QUEUE_DEPTH); 2168 2169 return 0; 2170} 2171EXPORT_SYMBOL(fc_slave_alloc); 2172 2173/** 2174 * fc_change_queue_depth() - Change a device's queue depth 2175 * @sdev: The SCSI device whose queue depth is to change 2176 * @qdepth: The new queue depth 2177 * @reason: The resason for the change 2178 */ 2179int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2180{ 2181 switch (reason) { 2182 case SCSI_QDEPTH_DEFAULT: 2183 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2184 break; 2185 case SCSI_QDEPTH_QFULL: 2186 scsi_track_queue_full(sdev, qdepth); 2187 break; 2188 case SCSI_QDEPTH_RAMP_UP: 2189 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2190 break; 2191 default: 2192 return -EOPNOTSUPP; 2193 } 2194 return sdev->queue_depth; 2195} 2196EXPORT_SYMBOL(fc_change_queue_depth); 2197 2198/** 2199 * fc_change_queue_type() - Change a device's queue type 2200 * @sdev: The SCSI device whose queue depth is to change 2201 * @tag_type: Identifier for queue type 2202 */ 2203int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2204{ 2205 if (sdev->tagged_supported) { 2206 scsi_set_tag_type(sdev, tag_type); 2207 if (tag_type) 2208 scsi_activate_tcq(sdev, sdev->queue_depth); 2209 else 2210 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2211 } else 2212 tag_type = 0; 2213 2214 return tag_type; 2215} 2216EXPORT_SYMBOL(fc_change_queue_type); 2217 2218/** 2219 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2220 * @lport: The local port that no longer needs the FCP layer 2221 */ 2222void fc_fcp_destroy(struct fc_lport *lport) 2223{ 2224 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2225 2226 if (!list_empty(&si->scsi_pkt_queue)) 2227 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2228 "port (%6.6x)\n", lport->port_id); 2229 2230 mempool_destroy(si->scsi_pkt_pool); 2231 kfree(si); 2232 lport->scsi_priv = NULL; 2233} 2234EXPORT_SYMBOL(fc_fcp_destroy); 2235 2236int fc_setup_fcp(void) 2237{ 2238 int rc = 0; 2239 2240 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2241 sizeof(struct fc_fcp_pkt), 2242 0, SLAB_HWCACHE_ALIGN, NULL); 2243 if (!scsi_pkt_cachep) { 2244 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2245 "module load failed!"); 2246 rc = -ENOMEM; 2247 } 2248 2249 return rc; 2250} 2251 2252void fc_destroy_fcp(void) 2253{ 2254 if (scsi_pkt_cachep) 2255 kmem_cache_destroy(scsi_pkt_cachep); 2256} 2257 2258/** 2259 * fc_fcp_init() - Initialize the FCP layer for a local port 2260 * @lport: The local port to initialize the exchange layer for 2261 */ 2262int fc_fcp_init(struct fc_lport *lport) 2263{ 2264 int rc; 2265 struct fc_fcp_internal *si; 2266 2267 if (!lport->tt.fcp_cmd_send) 2268 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2269 2270 if (!lport->tt.fcp_cleanup) 2271 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2272 2273 if (!lport->tt.fcp_abort_io) 2274 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2275 2276 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2277 if (!si) 2278 return -ENOMEM; 2279 lport->scsi_priv = si; 2280 si->max_can_queue = lport->host->can_queue; 2281 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2282 spin_lock_init(&si->scsi_queue_lock); 2283 2284 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2285 if (!si->scsi_pkt_pool) { 2286 rc = -ENOMEM; 2287 goto free_internal; 2288 } 2289 return 0; 2290 2291free_internal: 2292 kfree(si); 2293 return rc; 2294} 2295EXPORT_SYMBOL(fc_fcp_init); 2296