fc_fcp.c revision 7b2787ec15b9d1c2f716da61b0eec21a3f5e6520
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 45struct 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 host lock. NULL indicates 62 * that the command has been retruned to the scsi layer. 63 */ 64#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 65#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 66#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 67#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 68#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 69 70/** 71 * struct fc_fcp_internal - FCP layer internal data 72 * @scsi_pkt_pool: Memory pool to draw FCP packets from 73 * @scsi_queue_lock: Protects the scsi_pkt_queue 74 * @scsi_pkt_queue: Current FCP packets 75 * @last_can_queue_ramp_down_time: ramp down time 76 * @last_can_queue_ramp_up_time: ramp up time 77 * @max_can_queue: max can_queue size 78 */ 79struct fc_fcp_internal { 80 mempool_t *scsi_pkt_pool; 81 spinlock_t scsi_queue_lock; 82 struct list_head scsi_pkt_queue; 83 unsigned long last_can_queue_ramp_down_time; 84 unsigned long last_can_queue_ramp_up_time; 85 int max_can_queue; 86}; 87 88#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 89 90/* 91 * function prototypes 92 * FC scsi I/O related functions 93 */ 94static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 95static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 96static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 97static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 98static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 99static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 100static void fc_fcp_recovery(struct fc_fcp_pkt *); 101static void fc_fcp_timeout(unsigned long); 102static void fc_fcp_rec(struct fc_fcp_pkt *); 103static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 104static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 105static void fc_io_compl(struct fc_fcp_pkt *); 106 107static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 108static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 109static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 110 111/* 112 * command status codes 113 */ 114#define FC_COMPLETE 0 115#define FC_CMD_ABORTED 1 116#define FC_CMD_RESET 2 117#define FC_CMD_PLOGO 3 118#define FC_SNS_RCV 4 119#define FC_TRANS_ERR 5 120#define FC_DATA_OVRRUN 6 121#define FC_DATA_UNDRUN 7 122#define FC_ERROR 8 123#define FC_HRD_ERROR 9 124#define FC_CMD_RECOVERY 10 125 126/* 127 * Error recovery timeout values. 128 */ 129#define FC_SCSI_ER_TIMEOUT (10 * HZ) 130#define FC_SCSI_TM_TOV (10 * HZ) 131#define FC_SCSI_REC_TOV (2 * HZ) 132#define FC_HOST_RESET_TIMEOUT (30 * HZ) 133#define FC_CAN_QUEUE_PERIOD (60 * HZ) 134 135#define FC_MAX_ERROR_CNT 5 136#define FC_MAX_RECOV_RETRY 3 137 138#define FC_FCP_DFLT_QUEUE_DEPTH 32 139 140/** 141 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 142 * @lport: The local port that the FCP packet is for 143 * @gfp: GFP flags for allocation 144 * 145 * Return value: fcp_pkt structure or null on allocation failure. 146 * Context: Can be called from process context, no lock is required. 147 */ 148static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 149{ 150 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 151 struct fc_fcp_pkt *fsp; 152 153 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 154 if (fsp) { 155 memset(fsp, 0, sizeof(*fsp)); 156 fsp->lp = lport; 157 atomic_set(&fsp->ref_cnt, 1); 158 init_timer(&fsp->timer); 159 INIT_LIST_HEAD(&fsp->list); 160 spin_lock_init(&fsp->scsi_pkt_lock); 161 } 162 return fsp; 163} 164 165/** 166 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 167 * @fsp: The FCP packet to be released 168 * 169 * Context: Can be called from process or interrupt context, 170 * no lock is required. 171 */ 172static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 173{ 174 if (atomic_dec_and_test(&fsp->ref_cnt)) { 175 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 176 177 mempool_free(fsp, si->scsi_pkt_pool); 178 } 179} 180 181/** 182 * fc_fcp_pkt_hold() - Hold a fcp_pkt 183 * @fsp: The FCP packet to be held 184 */ 185static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 186{ 187 atomic_inc(&fsp->ref_cnt); 188} 189 190/** 191 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 192 * @seq: The sequence that the FCP packet is on (required by destructor API) 193 * @fsp: The FCP packet to be released 194 * 195 * This routine is called by a destructor callback in the exch_seq_send() 196 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 197 * argument even though it is not used by this routine. 198 * 199 * Context: No locking required. 200 */ 201static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 202{ 203 fc_fcp_pkt_release(fsp); 204} 205 206/** 207 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 208 * @fsp: The FCP packet to be locked and incremented 209 * 210 * We should only return error if we return a command to SCSI-ml before 211 * getting a response. This can happen in cases where we send a abort, but 212 * do not wait for the response and the abort and command can be passing 213 * each other on the wire/network-layer. 214 * 215 * Note: this function locks the packet and gets a reference to allow 216 * callers to call the completion function while the lock is held and 217 * not have to worry about the packets refcount. 218 * 219 * TODO: Maybe we should just have callers grab/release the lock and 220 * have a function that they call to verify the fsp and grab a ref if 221 * needed. 222 */ 223static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 224{ 225 spin_lock_bh(&fsp->scsi_pkt_lock); 226 if (fsp->state & FC_SRB_COMPL) { 227 spin_unlock_bh(&fsp->scsi_pkt_lock); 228 return -EPERM; 229 } 230 231 fc_fcp_pkt_hold(fsp); 232 return 0; 233} 234 235/** 236 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 237 * reference count 238 * @fsp: The FCP packet to be unlocked and decremented 239 */ 240static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 241{ 242 spin_unlock_bh(&fsp->scsi_pkt_lock); 243 fc_fcp_pkt_release(fsp); 244} 245 246/** 247 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 248 * @fsp: The FCP packet to start a timer for 249 * @delay: The timeout period for the timer 250 */ 251static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 252{ 253 if (!(fsp->state & FC_SRB_COMPL)) 254 mod_timer(&fsp->timer, jiffies + delay); 255} 256 257/** 258 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 259 * fcp_pkt 260 * @fsp: The FCP packet to abort exchanges on 261 */ 262static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 263{ 264 if (!fsp->seq_ptr) 265 return -EINVAL; 266 267 fsp->state |= FC_SRB_ABORT_PENDING; 268 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 269} 270 271/** 272 * fc_fcp_retry_cmd() - Retry a fcp_pkt 273 * @fsp: The FCP packet to be retried 274 * 275 * Sets the status code to be FC_ERROR and then calls 276 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 277 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 278 * The SCSI-ml will retry the command. 279 */ 280static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 281{ 282 if (fsp->seq_ptr) { 283 fsp->lp->tt.exch_done(fsp->seq_ptr); 284 fsp->seq_ptr = NULL; 285 } 286 287 fsp->state &= ~FC_SRB_ABORT_PENDING; 288 fsp->io_status = 0; 289 fsp->status_code = FC_ERROR; 290 fc_fcp_complete_locked(fsp); 291} 292 293/** 294 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 295 * @fsp: The FCP packet that will manage the DDP frames 296 * @xid: The XID that will be used for the DDP exchange 297 */ 298void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 299{ 300 struct fc_lport *lport; 301 302 lport = fsp->lp; 303 if ((fsp->req_flags & FC_SRB_READ) && 304 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 305 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 306 scsi_sg_count(fsp->cmd))) 307 fsp->xfer_ddp = xid; 308 } 309} 310 311/** 312 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 313 * DDP related resources for a fcp_pkt 314 * @fsp: The FCP packet that DDP had been used on 315 */ 316static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 317{ 318 struct fc_lport *lport; 319 320 if (!fsp) 321 return; 322 323 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 324 return; 325 326 lport = fsp->lp; 327 if (lport->tt.ddp_done) { 328 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 329 fsp->xfer_ddp = FC_XID_UNKNOWN; 330 } 331} 332 333/** 334 * fc_fcp_can_queue_ramp_up() - increases can_queue 335 * @lport: lport to ramp up can_queue 336 * 337 * Locking notes: Called with Scsi_Host lock held 338 */ 339static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 340{ 341 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 342 int can_queue; 343 344 if (si->last_can_queue_ramp_up_time && 345 (time_before(jiffies, si->last_can_queue_ramp_up_time + 346 FC_CAN_QUEUE_PERIOD))) 347 return; 348 349 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 350 FC_CAN_QUEUE_PERIOD)) 351 return; 352 353 si->last_can_queue_ramp_up_time = jiffies; 354 355 can_queue = lport->host->can_queue << 1; 356 if (can_queue >= si->max_can_queue) { 357 can_queue = si->max_can_queue; 358 si->last_can_queue_ramp_down_time = 0; 359 } 360 lport->host->can_queue = can_queue; 361 shost_printk(KERN_ERR, lport->host, "libfc: increased " 362 "can_queue to %d.\n", can_queue); 363} 364 365/** 366 * fc_fcp_can_queue_ramp_down() - reduces can_queue 367 * @lport: lport to reduce can_queue 368 * 369 * If we are getting memory allocation failures, then we may 370 * be trying to execute too many commands. We let the running 371 * commands complete or timeout, then try again with a reduced 372 * can_queue. Eventually we will hit the point where we run 373 * on all reserved structs. 374 * 375 * Locking notes: Called with Scsi_Host lock held 376 */ 377static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 378{ 379 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 380 int can_queue; 381 382 if (si->last_can_queue_ramp_down_time && 383 (time_before(jiffies, si->last_can_queue_ramp_down_time + 384 FC_CAN_QUEUE_PERIOD))) 385 return; 386 387 si->last_can_queue_ramp_down_time = jiffies; 388 389 can_queue = lport->host->can_queue; 390 can_queue >>= 1; 391 if (!can_queue) 392 can_queue = 1; 393 lport->host->can_queue = can_queue; 394 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 395 "Reducing can_queue to %d.\n", can_queue); 396} 397 398/* 399 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 400 * @lport: fc lport struct 401 * @len: payload length 402 * 403 * Allocates fc_frame structure and buffer but if fails to allocate 404 * then reduce can_queue. 405 */ 406static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 407 size_t len) 408{ 409 struct fc_frame *fp; 410 unsigned long flags; 411 412 fp = fc_frame_alloc(lport, len); 413 if (likely(fp)) 414 return fp; 415 416 /* error case */ 417 spin_lock_irqsave(lport->host->host_lock, flags); 418 fc_fcp_can_queue_ramp_down(lport); 419 spin_unlock_irqrestore(lport->host->host_lock, flags); 420 return NULL; 421} 422 423/** 424 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 425 * @fsp: The FCP packet the data is on 426 * @fp: The data frame 427 */ 428static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 429{ 430 struct scsi_cmnd *sc = fsp->cmd; 431 struct fc_lport *lport = fsp->lp; 432 struct fcoe_dev_stats *stats; 433 struct fc_frame_header *fh; 434 size_t start_offset; 435 size_t offset; 436 u32 crc; 437 u32 copy_len = 0; 438 size_t len; 439 void *buf; 440 struct scatterlist *sg; 441 u32 nents; 442 443 fh = fc_frame_header_get(fp); 444 offset = ntohl(fh->fh_parm_offset); 445 start_offset = offset; 446 len = fr_len(fp) - sizeof(*fh); 447 buf = fc_frame_payload_get(fp, 0); 448 449 /* 450 * if this I/O is ddped then clear it 451 * and initiate recovery since data 452 * frames are expected to be placed 453 * directly in that case. 454 */ 455 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 456 fc_fcp_ddp_done(fsp); 457 goto err; 458 } 459 if (offset + len > fsp->data_len) { 460 /* this should never happen */ 461 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 462 fc_frame_crc_check(fp)) 463 goto crc_err; 464 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 465 "data_len %x\n", len, offset, fsp->data_len); 466 goto err; 467 } 468 if (offset != fsp->xfer_len) 469 fsp->state |= FC_SRB_DISCONTIG; 470 471 sg = scsi_sglist(sc); 472 nents = scsi_sg_count(sc); 473 474 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 475 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 476 &offset, KM_SOFTIRQ0, NULL); 477 } else { 478 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 479 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 480 &offset, KM_SOFTIRQ0, &crc); 481 buf = fc_frame_payload_get(fp, 0); 482 if (len % 4) 483 crc = crc32(crc, buf + len, 4 - (len % 4)); 484 485 if (~crc != le32_to_cpu(fr_crc(fp))) { 486crc_err: 487 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 488 stats->ErrorFrames++; 489 /* per cpu count, not total count, but OK for limit */ 490 if (stats->InvalidCRCCount++ < 5) 491 printk(KERN_WARNING "libfc: CRC error on data " 492 "frame for port (%6.6x)\n", 493 lport->port_id); 494 put_cpu(); 495 /* 496 * Assume the frame is total garbage. 497 * We may have copied it over the good part 498 * of the buffer. 499 * If so, we need to retry the entire operation. 500 * Otherwise, ignore it. 501 */ 502 if (fsp->state & FC_SRB_DISCONTIG) 503 goto err; 504 return; 505 } 506 } 507 508 if (fsp->xfer_contig_end == start_offset) 509 fsp->xfer_contig_end += copy_len; 510 fsp->xfer_len += copy_len; 511 512 /* 513 * In the very rare event that this data arrived after the response 514 * and completes the transfer, call the completion handler. 515 */ 516 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 517 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 518 fc_fcp_complete_locked(fsp); 519 return; 520err: 521 fc_fcp_recovery(fsp); 522} 523 524/** 525 * fc_fcp_send_data() - Send SCSI data to a target 526 * @fsp: The FCP packet the data is on 527 * @sp: The sequence the data is to be sent on 528 * @offset: The starting offset for this data request 529 * @seq_blen: The burst length for this data request 530 * 531 * Called after receiving a Transfer Ready data descriptor. 532 * If the LLD is capable of sequence offload then send down the 533 * seq_blen amount of data in single frame, otherwise send 534 * multiple frames of the maximum frame payload supported by 535 * the target port. 536 */ 537static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 538 size_t offset, size_t seq_blen) 539{ 540 struct fc_exch *ep; 541 struct scsi_cmnd *sc; 542 struct scatterlist *sg; 543 struct fc_frame *fp = NULL; 544 struct fc_lport *lport = fsp->lp; 545 struct page *page; 546 size_t remaining; 547 size_t t_blen; 548 size_t tlen; 549 size_t sg_bytes; 550 size_t frame_offset, fh_parm_offset; 551 size_t off; 552 int error; 553 void *data = NULL; 554 void *page_addr; 555 int using_sg = lport->sg_supp; 556 u32 f_ctl; 557 558 WARN_ON(seq_blen <= 0); 559 if (unlikely(offset + seq_blen > fsp->data_len)) { 560 /* this should never happen */ 561 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 562 "offset %zx\n", seq_blen, offset); 563 fc_fcp_send_abort(fsp); 564 return 0; 565 } else if (offset != fsp->xfer_len) { 566 /* Out of Order Data Request - no problem, but unexpected. */ 567 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 568 "seq_blen %zx offset %zx\n", seq_blen, offset); 569 } 570 571 /* 572 * if LLD is capable of seq_offload then set transport 573 * burst length (t_blen) to seq_blen, otherwise set t_blen 574 * to max FC frame payload previously set in fsp->max_payload. 575 */ 576 t_blen = fsp->max_payload; 577 if (lport->seq_offload) { 578 t_blen = min(seq_blen, (size_t)lport->lso_max); 579 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 580 fsp, seq_blen, lport->lso_max, t_blen); 581 } 582 583 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); 584 if (t_blen > 512) 585 t_blen &= ~(512 - 1); /* round down to block size */ 586 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ 587 sc = fsp->cmd; 588 589 remaining = seq_blen; 590 fh_parm_offset = frame_offset = offset; 591 tlen = 0; 592 seq = lport->tt.seq_start_next(seq); 593 f_ctl = FC_FC_REL_OFF; 594 WARN_ON(!seq); 595 596 sg = scsi_sglist(sc); 597 598 while (remaining > 0 && sg) { 599 if (offset >= sg->length) { 600 offset -= sg->length; 601 sg = sg_next(sg); 602 continue; 603 } 604 if (!fp) { 605 tlen = min(t_blen, remaining); 606 607 /* 608 * TODO. Temporary workaround. fc_seq_send() can't 609 * handle odd lengths in non-linear skbs. 610 * This will be the final fragment only. 611 */ 612 if (tlen % 4) 613 using_sg = 0; 614 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 615 if (!fp) 616 return -ENOMEM; 617 618 data = fc_frame_header_get(fp) + 1; 619 fh_parm_offset = frame_offset; 620 fr_max_payload(fp) = fsp->max_payload; 621 } 622 623 off = offset + sg->offset; 624 sg_bytes = min(tlen, sg->length - offset); 625 sg_bytes = min(sg_bytes, 626 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 627 page = sg_page(sg) + (off >> PAGE_SHIFT); 628 if (using_sg) { 629 get_page(page); 630 skb_fill_page_desc(fp_skb(fp), 631 skb_shinfo(fp_skb(fp))->nr_frags, 632 page, off & ~PAGE_MASK, sg_bytes); 633 fp_skb(fp)->data_len += sg_bytes; 634 fr_len(fp) += sg_bytes; 635 fp_skb(fp)->truesize += PAGE_SIZE; 636 } else { 637 /* 638 * The scatterlist item may be bigger than PAGE_SIZE, 639 * but we must not cross pages inside the kmap. 640 */ 641 page_addr = kmap_atomic(page, KM_SOFTIRQ0); 642 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 643 sg_bytes); 644 kunmap_atomic(page_addr, KM_SOFTIRQ0); 645 data += sg_bytes; 646 } 647 offset += sg_bytes; 648 frame_offset += sg_bytes; 649 tlen -= sg_bytes; 650 remaining -= sg_bytes; 651 652 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 653 (tlen)) 654 continue; 655 656 /* 657 * Send sequence with transfer sequence initiative in case 658 * this is last FCP frame of the sequence. 659 */ 660 if (remaining == 0) 661 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 662 663 ep = fc_seq_exch(seq); 664 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 665 FC_TYPE_FCP, f_ctl, fh_parm_offset); 666 667 /* 668 * send fragment using for a sequence. 669 */ 670 error = lport->tt.seq_send(lport, seq, fp); 671 if (error) { 672 WARN_ON(1); /* send error should be rare */ 673 fc_fcp_retry_cmd(fsp); 674 return 0; 675 } 676 fp = NULL; 677 } 678 fsp->xfer_len += seq_blen; /* premature count? */ 679 return 0; 680} 681 682/** 683 * fc_fcp_abts_resp() - Send an ABTS response 684 * @fsp: The FCP packet that is being aborted 685 * @fp: The response frame 686 */ 687static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 688{ 689 int ba_done = 1; 690 struct fc_ba_rjt *brp; 691 struct fc_frame_header *fh; 692 693 fh = fc_frame_header_get(fp); 694 switch (fh->fh_r_ctl) { 695 case FC_RCTL_BA_ACC: 696 break; 697 case FC_RCTL_BA_RJT: 698 brp = fc_frame_payload_get(fp, sizeof(*brp)); 699 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 700 break; 701 /* fall thru */ 702 default: 703 /* 704 * we will let the command timeout 705 * and scsi-ml recover in this case, 706 * therefore cleared the ba_done flag. 707 */ 708 ba_done = 0; 709 } 710 711 if (ba_done) { 712 fsp->state |= FC_SRB_ABORTED; 713 fsp->state &= ~FC_SRB_ABORT_PENDING; 714 715 if (fsp->wait_for_comp) 716 complete(&fsp->tm_done); 717 else 718 fc_fcp_complete_locked(fsp); 719 } 720} 721 722/** 723 * fc_fcp_recv() - Reveive an FCP frame 724 * @seq: The sequence the frame is on 725 * @fp: The received frame 726 * @arg: The related FCP packet 727 * 728 * Context: Called from Soft IRQ context. Can not be called 729 * holding the FCP packet list lock. 730 */ 731static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 732{ 733 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 734 struct fc_lport *lport = fsp->lp; 735 struct fc_frame_header *fh; 736 struct fcp_txrdy *dd; 737 u8 r_ctl; 738 int rc = 0; 739 740 if (IS_ERR(fp)) { 741 fc_fcp_error(fsp, fp); 742 return; 743 } 744 745 fh = fc_frame_header_get(fp); 746 r_ctl = fh->fh_r_ctl; 747 748 if (!(lport->state & LPORT_ST_READY)) 749 goto out; 750 if (fc_fcp_lock_pkt(fsp)) 751 goto out; 752 fsp->last_pkt_time = jiffies; 753 754 if (fh->fh_type == FC_TYPE_BLS) { 755 fc_fcp_abts_resp(fsp, fp); 756 goto unlock; 757 } 758 759 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 760 goto unlock; 761 762 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 763 /* 764 * received XFER RDY from the target 765 * need to send data to the target 766 */ 767 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 768 dd = fc_frame_payload_get(fp, sizeof(*dd)); 769 WARN_ON(!dd); 770 771 rc = fc_fcp_send_data(fsp, seq, 772 (size_t) ntohl(dd->ft_data_ro), 773 (size_t) ntohl(dd->ft_burst_len)); 774 if (!rc) 775 seq->rec_data = fsp->xfer_len; 776 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 777 /* 778 * received a DATA frame 779 * next we will copy the data to the system buffer 780 */ 781 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 782 fc_fcp_recv_data(fsp, fp); 783 seq->rec_data = fsp->xfer_contig_end; 784 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 785 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 786 787 fc_fcp_resp(fsp, fp); 788 } else { 789 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 790 } 791unlock: 792 fc_fcp_unlock_pkt(fsp); 793out: 794 fc_frame_free(fp); 795} 796 797/** 798 * fc_fcp_resp() - Handler for FCP responses 799 * @fsp: The FCP packet the response is for 800 * @fp: The response frame 801 */ 802static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 803{ 804 struct fc_frame_header *fh; 805 struct fcp_resp *fc_rp; 806 struct fcp_resp_ext *rp_ex; 807 struct fcp_resp_rsp_info *fc_rp_info; 808 u32 plen; 809 u32 expected_len; 810 u32 respl = 0; 811 u32 snsl = 0; 812 u8 flags = 0; 813 814 plen = fr_len(fp); 815 fh = (struct fc_frame_header *)fr_hdr(fp); 816 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 817 goto len_err; 818 plen -= sizeof(*fh); 819 fc_rp = (struct fcp_resp *)(fh + 1); 820 fsp->cdb_status = fc_rp->fr_status; 821 flags = fc_rp->fr_flags; 822 fsp->scsi_comp_flags = flags; 823 expected_len = fsp->data_len; 824 825 /* if ddp, update xfer len */ 826 fc_fcp_ddp_done(fsp); 827 828 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 829 rp_ex = (void *)(fc_rp + 1); 830 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 831 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 832 goto len_err; 833 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 834 if (flags & FCP_RSP_LEN_VAL) { 835 respl = ntohl(rp_ex->fr_rsp_len); 836 if (respl != sizeof(*fc_rp_info)) 837 goto len_err; 838 if (fsp->wait_for_comp) { 839 /* Abuse cdb_status for rsp code */ 840 fsp->cdb_status = fc_rp_info->rsp_code; 841 complete(&fsp->tm_done); 842 /* 843 * tmfs will not have any scsi cmd so 844 * exit here 845 */ 846 return; 847 } 848 } 849 if (flags & FCP_SNS_LEN_VAL) { 850 snsl = ntohl(rp_ex->fr_sns_len); 851 if (snsl > SCSI_SENSE_BUFFERSIZE) 852 snsl = SCSI_SENSE_BUFFERSIZE; 853 memcpy(fsp->cmd->sense_buffer, 854 (char *)fc_rp_info + respl, snsl); 855 } 856 } 857 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 858 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 859 goto len_err; 860 if (flags & FCP_RESID_UNDER) { 861 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 862 /* 863 * The cmnd->underflow is the minimum number of 864 * bytes that must be transfered for this 865 * command. Provided a sense condition is not 866 * present, make sure the actual amount 867 * transferred is at least the underflow value 868 * or fail. 869 */ 870 if (!(flags & FCP_SNS_LEN_VAL) && 871 (fc_rp->fr_status == 0) && 872 (scsi_bufflen(fsp->cmd) - 873 fsp->scsi_resid) < fsp->cmd->underflow) 874 goto err; 875 expected_len -= fsp->scsi_resid; 876 } else { 877 fsp->status_code = FC_ERROR; 878 } 879 } 880 } 881 fsp->state |= FC_SRB_RCV_STATUS; 882 883 /* 884 * Check for missing or extra data frames. 885 */ 886 if (unlikely(fsp->xfer_len != expected_len)) { 887 if (fsp->xfer_len < expected_len) { 888 /* 889 * Some data may be queued locally, 890 * Wait a at least one jiffy to see if it is delivered. 891 * If this expires without data, we may do SRR. 892 */ 893 fc_fcp_timer_set(fsp, 2); 894 return; 895 } 896 fsp->status_code = FC_DATA_OVRRUN; 897 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 898 "len %x, data len %x\n", 899 fsp->rport->port_id, 900 fsp->xfer_len, expected_len, fsp->data_len); 901 } 902 fc_fcp_complete_locked(fsp); 903 return; 904 905len_err: 906 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 907 "snsl %u\n", flags, fr_len(fp), respl, snsl); 908err: 909 fsp->status_code = FC_ERROR; 910 fc_fcp_complete_locked(fsp); 911} 912 913/** 914 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 915 * fcp_pkt lock held 916 * @fsp: The FCP packet to be completed 917 * 918 * This function may sleep if a timer is pending. The packet lock must be 919 * held, and the host lock must not be held. 920 */ 921static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 922{ 923 struct fc_lport *lport = fsp->lp; 924 struct fc_seq *seq; 925 struct fc_exch *ep; 926 u32 f_ctl; 927 928 if (fsp->state & FC_SRB_ABORT_PENDING) 929 return; 930 931 if (fsp->state & FC_SRB_ABORTED) { 932 if (!fsp->status_code) 933 fsp->status_code = FC_CMD_ABORTED; 934 } else { 935 /* 936 * Test for transport underrun, independent of response 937 * underrun status. 938 */ 939 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 940 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 941 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 942 fsp->status_code = FC_DATA_UNDRUN; 943 fsp->io_status = 0; 944 } 945 } 946 947 seq = fsp->seq_ptr; 948 if (seq) { 949 fsp->seq_ptr = NULL; 950 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 951 struct fc_frame *conf_frame; 952 struct fc_seq *csp; 953 954 csp = lport->tt.seq_start_next(seq); 955 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 956 if (conf_frame) { 957 f_ctl = FC_FC_SEQ_INIT; 958 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 959 ep = fc_seq_exch(seq); 960 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 961 ep->did, ep->sid, 962 FC_TYPE_FCP, f_ctl, 0); 963 lport->tt.seq_send(lport, csp, conf_frame); 964 } 965 } 966 lport->tt.exch_done(seq); 967 } 968 fc_io_compl(fsp); 969} 970 971/** 972 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 973 * @fsp: The FCP packet whose exchanges should be canceled 974 * @error: The reason for the cancellation 975 */ 976static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 977{ 978 struct fc_lport *lport = fsp->lp; 979 980 if (fsp->seq_ptr) { 981 lport->tt.exch_done(fsp->seq_ptr); 982 fsp->seq_ptr = NULL; 983 } 984 fsp->status_code = error; 985} 986 987/** 988 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 989 * @lport: The local port whose exchanges should be canceled 990 * @id: The target's ID 991 * @lun: The LUN 992 * @error: The reason for cancellation 993 * 994 * If lun or id is -1, they are ignored. 995 */ 996static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 997 unsigned int lun, int error) 998{ 999 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1000 struct fc_fcp_pkt *fsp; 1001 struct scsi_cmnd *sc_cmd; 1002 unsigned long flags; 1003 1004 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1005restart: 1006 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1007 sc_cmd = fsp->cmd; 1008 if (id != -1 && scmd_id(sc_cmd) != id) 1009 continue; 1010 1011 if (lun != -1 && sc_cmd->device->lun != lun) 1012 continue; 1013 1014 fc_fcp_pkt_hold(fsp); 1015 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1016 1017 if (!fc_fcp_lock_pkt(fsp)) { 1018 fc_fcp_cleanup_cmd(fsp, error); 1019 fc_io_compl(fsp); 1020 fc_fcp_unlock_pkt(fsp); 1021 } 1022 1023 fc_fcp_pkt_release(fsp); 1024 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1025 /* 1026 * while we dropped the lock multiple pkts could 1027 * have been released, so we have to start over. 1028 */ 1029 goto restart; 1030 } 1031 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1032} 1033 1034/** 1035 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1036 * @lport: The local port whose exchanges are to be aborted 1037 */ 1038static void fc_fcp_abort_io(struct fc_lport *lport) 1039{ 1040 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1041} 1042 1043/** 1044 * fc_fcp_pkt_send() - Send a fcp_pkt 1045 * @lport: The local port to send the FCP packet on 1046 * @fsp: The FCP packet to send 1047 * 1048 * Return: Zero for success and -1 for failure 1049 * Locks: Called without locks held 1050 */ 1051static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1052{ 1053 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1054 unsigned long flags; 1055 int rc; 1056 1057 fsp->cmd->SCp.ptr = (char *)fsp; 1058 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1059 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1060 1061 int_to_scsilun(fsp->cmd->device->lun, 1062 (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1063 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1064 1065 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1066 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1067 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1068 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1069 if (unlikely(rc)) { 1070 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1071 list_del(&fsp->list); 1072 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1073 } 1074 1075 return rc; 1076} 1077 1078/** 1079 * fc_fcp_cmd_send() - Send a FCP command 1080 * @lport: The local port to send the command on 1081 * @fsp: The FCP packet the command is on 1082 * @resp: The handler for the response 1083 */ 1084static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1085 void (*resp)(struct fc_seq *, 1086 struct fc_frame *fp, 1087 void *arg)) 1088{ 1089 struct fc_frame *fp; 1090 struct fc_seq *seq; 1091 struct fc_rport *rport; 1092 struct fc_rport_libfc_priv *rpriv; 1093 const size_t len = sizeof(fsp->cdb_cmd); 1094 int rc = 0; 1095 1096 if (fc_fcp_lock_pkt(fsp)) 1097 return 0; 1098 1099 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1100 if (!fp) { 1101 rc = -1; 1102 goto unlock; 1103 } 1104 1105 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1106 fr_fsp(fp) = fsp; 1107 rport = fsp->rport; 1108 fsp->max_payload = rport->maxframe_size; 1109 rpriv = rport->dd_data; 1110 1111 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1112 rpriv->local_port->port_id, FC_TYPE_FCP, 1113 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1114 1115 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1116 fsp, 0); 1117 if (!seq) { 1118 rc = -1; 1119 goto unlock; 1120 } 1121 fsp->last_pkt_time = jiffies; 1122 fsp->seq_ptr = seq; 1123 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1124 1125 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1126 fc_fcp_timer_set(fsp, 1127 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? 1128 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); 1129unlock: 1130 fc_fcp_unlock_pkt(fsp); 1131 return rc; 1132} 1133 1134/** 1135 * fc_fcp_error() - Handler for FCP layer errors 1136 * @fsp: The FCP packet the error is on 1137 * @fp: The frame that has errored 1138 */ 1139static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1140{ 1141 int error = PTR_ERR(fp); 1142 1143 if (fc_fcp_lock_pkt(fsp)) 1144 return; 1145 1146 if (error == -FC_EX_CLOSED) { 1147 fc_fcp_retry_cmd(fsp); 1148 goto unlock; 1149 } 1150 1151 /* 1152 * clear abort pending, because the lower layer 1153 * decided to force completion. 1154 */ 1155 fsp->state &= ~FC_SRB_ABORT_PENDING; 1156 fsp->status_code = FC_CMD_PLOGO; 1157 fc_fcp_complete_locked(fsp); 1158unlock: 1159 fc_fcp_unlock_pkt(fsp); 1160} 1161 1162/** 1163 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1164 * @fsp: The FCP packet to abort on 1165 * 1166 * Called to send an abort and then wait for abort completion 1167 */ 1168static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1169{ 1170 int rc = FAILED; 1171 1172 if (fc_fcp_send_abort(fsp)) 1173 return FAILED; 1174 1175 init_completion(&fsp->tm_done); 1176 fsp->wait_for_comp = 1; 1177 1178 spin_unlock_bh(&fsp->scsi_pkt_lock); 1179 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1180 spin_lock_bh(&fsp->scsi_pkt_lock); 1181 fsp->wait_for_comp = 0; 1182 1183 if (!rc) { 1184 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1185 rc = FAILED; 1186 } else if (fsp->state & FC_SRB_ABORTED) { 1187 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1188 rc = SUCCESS; 1189 fc_fcp_complete_locked(fsp); 1190 } 1191 1192 return rc; 1193} 1194 1195/** 1196 * fc_lun_reset_send() - Send LUN reset command 1197 * @data: The FCP packet that identifies the LUN to be reset 1198 */ 1199static void fc_lun_reset_send(unsigned long data) 1200{ 1201 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1202 struct fc_lport *lport = fsp->lp; 1203 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1204 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1205 return; 1206 if (fc_fcp_lock_pkt(fsp)) 1207 return; 1208 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1209 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1210 fc_fcp_unlock_pkt(fsp); 1211 } 1212} 1213 1214/** 1215 * fc_lun_reset() - Send a LUN RESET command to a device 1216 * and wait for the reply 1217 * @lport: The local port to sent the comand on 1218 * @fsp: The FCP packet that identifies the LUN to be reset 1219 * @id: The SCSI command ID 1220 * @lun: The LUN ID to be reset 1221 */ 1222static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1223 unsigned int id, unsigned int lun) 1224{ 1225 int rc; 1226 1227 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1228 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1229 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1230 1231 fsp->wait_for_comp = 1; 1232 init_completion(&fsp->tm_done); 1233 1234 fc_lun_reset_send((unsigned long)fsp); 1235 1236 /* 1237 * wait for completion of reset 1238 * after that make sure all commands are terminated 1239 */ 1240 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1241 1242 spin_lock_bh(&fsp->scsi_pkt_lock); 1243 fsp->state |= FC_SRB_COMPL; 1244 spin_unlock_bh(&fsp->scsi_pkt_lock); 1245 1246 del_timer_sync(&fsp->timer); 1247 1248 spin_lock_bh(&fsp->scsi_pkt_lock); 1249 if (fsp->seq_ptr) { 1250 lport->tt.exch_done(fsp->seq_ptr); 1251 fsp->seq_ptr = NULL; 1252 } 1253 fsp->wait_for_comp = 0; 1254 spin_unlock_bh(&fsp->scsi_pkt_lock); 1255 1256 if (!rc) { 1257 FC_SCSI_DBG(lport, "lun reset failed\n"); 1258 return FAILED; 1259 } 1260 1261 /* cdb_status holds the tmf's rsp code */ 1262 if (fsp->cdb_status != FCP_TMF_CMPL) 1263 return FAILED; 1264 1265 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1266 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1267 return SUCCESS; 1268} 1269 1270/** 1271 * fc_tm_done() - Task Managment response handler 1272 * @seq: The sequence that the response is on 1273 * @fp: The response frame 1274 * @arg: The FCP packet the response is for 1275 */ 1276static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1277{ 1278 struct fc_fcp_pkt *fsp = arg; 1279 struct fc_frame_header *fh; 1280 1281 if (IS_ERR(fp)) { 1282 /* 1283 * If there is an error just let it timeout or wait 1284 * for TMF to be aborted if it timedout. 1285 * 1286 * scsi-eh will escalate for when either happens. 1287 */ 1288 return; 1289 } 1290 1291 if (fc_fcp_lock_pkt(fsp)) 1292 return; 1293 1294 /* 1295 * raced with eh timeout handler. 1296 */ 1297 if (!fsp->seq_ptr || !fsp->wait_for_comp) { 1298 spin_unlock_bh(&fsp->scsi_pkt_lock); 1299 return; 1300 } 1301 1302 fh = fc_frame_header_get(fp); 1303 if (fh->fh_type != FC_TYPE_BLS) 1304 fc_fcp_resp(fsp, fp); 1305 fsp->seq_ptr = NULL; 1306 fsp->lp->tt.exch_done(seq); 1307 fc_frame_free(fp); 1308 fc_fcp_unlock_pkt(fsp); 1309} 1310 1311/** 1312 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1313 * @lport: The local port to be cleaned up 1314 */ 1315static void fc_fcp_cleanup(struct fc_lport *lport) 1316{ 1317 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1318} 1319 1320/** 1321 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1322 * @data: The FCP packet that has timed out 1323 * 1324 * If REC is supported then just issue it and return. The REC exchange will 1325 * complete or time out and recovery can continue at that point. Otherwise, 1326 * if the response has been received without all the data it has been 1327 * ER_TIMEOUT since the response was received. If the response has not been 1328 * received we see if data was received recently. If it has been then we 1329 * continue waiting, otherwise, we abort the command. 1330 */ 1331static void fc_fcp_timeout(unsigned long data) 1332{ 1333 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1334 struct fc_rport *rport = fsp->rport; 1335 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1336 1337 if (fc_fcp_lock_pkt(fsp)) 1338 return; 1339 1340 if (fsp->cdb_cmd.fc_tm_flags) 1341 goto unlock; 1342 1343 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1344 1345 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1346 fc_fcp_rec(fsp); 1347 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), 1348 jiffies)) 1349 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1350 else if (fsp->state & FC_SRB_RCV_STATUS) 1351 fc_fcp_complete_locked(fsp); 1352 else 1353 fc_fcp_recovery(fsp); 1354 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1355unlock: 1356 fc_fcp_unlock_pkt(fsp); 1357} 1358 1359/** 1360 * fc_fcp_rec() - Send a REC ELS request 1361 * @fsp: The FCP packet to send the REC request on 1362 */ 1363static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1364{ 1365 struct fc_lport *lport; 1366 struct fc_frame *fp; 1367 struct fc_rport *rport; 1368 struct fc_rport_libfc_priv *rpriv; 1369 1370 lport = fsp->lp; 1371 rport = fsp->rport; 1372 rpriv = rport->dd_data; 1373 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1374 fsp->status_code = FC_HRD_ERROR; 1375 fsp->io_status = 0; 1376 fc_fcp_complete_locked(fsp); 1377 return; 1378 } 1379 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1380 if (!fp) 1381 goto retry; 1382 1383 fr_seq(fp) = fsp->seq_ptr; 1384 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1385 rpriv->local_port->port_id, FC_TYPE_ELS, 1386 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1387 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1388 fc_fcp_rec_resp, fsp, 1389 jiffies_to_msecs(FC_SCSI_REC_TOV))) { 1390 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1391 return; 1392 } 1393retry: 1394 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1395 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1396 else 1397 fc_fcp_recovery(fsp); 1398} 1399 1400/** 1401 * fc_fcp_rec_resp() - Handler for REC ELS responses 1402 * @seq: The sequence the response is on 1403 * @fp: The response frame 1404 * @arg: The FCP packet the response is on 1405 * 1406 * If the response is a reject then the scsi layer will handle 1407 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1408 * set the timeout and return. If the I/O was completed then complete the 1409 * exchange and tell the SCSI layer. 1410 */ 1411static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1412{ 1413 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1414 struct fc_els_rec_acc *recp; 1415 struct fc_els_ls_rjt *rjt; 1416 u32 e_stat; 1417 u8 opcode; 1418 u32 offset; 1419 enum dma_data_direction data_dir; 1420 enum fc_rctl r_ctl; 1421 struct fc_rport_libfc_priv *rpriv; 1422 1423 if (IS_ERR(fp)) { 1424 fc_fcp_rec_error(fsp, fp); 1425 return; 1426 } 1427 1428 if (fc_fcp_lock_pkt(fsp)) 1429 goto out; 1430 1431 fsp->recov_retry = 0; 1432 opcode = fc_frame_payload_op(fp); 1433 if (opcode == ELS_LS_RJT) { 1434 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1435 switch (rjt->er_reason) { 1436 default: 1437 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1438 "reason %d expl %d\n", 1439 fsp->rport->port_id, rjt->er_reason, 1440 rjt->er_explan); 1441 /* fall through */ 1442 case ELS_RJT_UNSUP: 1443 FC_FCP_DBG(fsp, "device does not support REC\n"); 1444 rpriv = fsp->rport->dd_data; 1445 /* 1446 * if we do not spport RECs or got some bogus 1447 * reason then resetup timer so we check for 1448 * making progress. 1449 */ 1450 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1451 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1452 break; 1453 case ELS_RJT_LOGIC: 1454 case ELS_RJT_UNAB: 1455 /* 1456 * If no data transfer, the command frame got dropped 1457 * so we just retry. If data was transferred, we 1458 * lost the response but the target has no record, 1459 * so we abort and retry. 1460 */ 1461 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1462 fsp->xfer_len == 0) { 1463 fc_fcp_retry_cmd(fsp); 1464 break; 1465 } 1466 fc_fcp_recovery(fsp); 1467 break; 1468 } 1469 } else if (opcode == ELS_LS_ACC) { 1470 if (fsp->state & FC_SRB_ABORTED) 1471 goto unlock_out; 1472 1473 data_dir = fsp->cmd->sc_data_direction; 1474 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1475 offset = ntohl(recp->reca_fc4value); 1476 e_stat = ntohl(recp->reca_e_stat); 1477 1478 if (e_stat & ESB_ST_COMPLETE) { 1479 1480 /* 1481 * The exchange is complete. 1482 * 1483 * For output, we must've lost the response. 1484 * For input, all data must've been sent. 1485 * We lost may have lost the response 1486 * (and a confirmation was requested) and maybe 1487 * some data. 1488 * 1489 * If all data received, send SRR 1490 * asking for response. If partial data received, 1491 * or gaps, SRR requests data at start of gap. 1492 * Recovery via SRR relies on in-order-delivery. 1493 */ 1494 if (data_dir == DMA_TO_DEVICE) { 1495 r_ctl = FC_RCTL_DD_CMD_STATUS; 1496 } else if (fsp->xfer_contig_end == offset) { 1497 r_ctl = FC_RCTL_DD_CMD_STATUS; 1498 } else { 1499 offset = fsp->xfer_contig_end; 1500 r_ctl = FC_RCTL_DD_SOL_DATA; 1501 } 1502 fc_fcp_srr(fsp, r_ctl, offset); 1503 } else if (e_stat & ESB_ST_SEQ_INIT) { 1504 1505 /* 1506 * The remote port has the initiative, so just 1507 * keep waiting for it to complete. 1508 */ 1509 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1510 } else { 1511 1512 /* 1513 * The exchange is incomplete, we have seq. initiative. 1514 * Lost response with requested confirmation, 1515 * lost confirmation, lost transfer ready or 1516 * lost write data. 1517 * 1518 * For output, if not all data was received, ask 1519 * for transfer ready to be repeated. 1520 * 1521 * If we received or sent all the data, send SRR to 1522 * request response. 1523 * 1524 * If we lost a response, we may have lost some read 1525 * data as well. 1526 */ 1527 r_ctl = FC_RCTL_DD_SOL_DATA; 1528 if (data_dir == DMA_TO_DEVICE) { 1529 r_ctl = FC_RCTL_DD_CMD_STATUS; 1530 if (offset < fsp->data_len) 1531 r_ctl = FC_RCTL_DD_DATA_DESC; 1532 } else if (offset == fsp->xfer_contig_end) { 1533 r_ctl = FC_RCTL_DD_CMD_STATUS; 1534 } else if (fsp->xfer_contig_end < offset) { 1535 offset = fsp->xfer_contig_end; 1536 } 1537 fc_fcp_srr(fsp, r_ctl, offset); 1538 } 1539 } 1540unlock_out: 1541 fc_fcp_unlock_pkt(fsp); 1542out: 1543 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1544 fc_frame_free(fp); 1545} 1546 1547/** 1548 * fc_fcp_rec_error() - Handler for REC errors 1549 * @fsp: The FCP packet the error is on 1550 * @fp: The REC frame 1551 */ 1552static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1553{ 1554 int error = PTR_ERR(fp); 1555 1556 if (fc_fcp_lock_pkt(fsp)) 1557 goto out; 1558 1559 switch (error) { 1560 case -FC_EX_CLOSED: 1561 fc_fcp_retry_cmd(fsp); 1562 break; 1563 1564 default: 1565 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1566 fsp, fsp->rport->port_id, error); 1567 fsp->status_code = FC_CMD_PLOGO; 1568 /* fall through */ 1569 1570 case -FC_EX_TIMEOUT: 1571 /* 1572 * Assume REC or LS_ACC was lost. 1573 * The exchange manager will have aborted REC, so retry. 1574 */ 1575 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", 1576 fsp->rport->port_id, error, fsp->recov_retry, 1577 FC_MAX_RECOV_RETRY); 1578 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1579 fc_fcp_rec(fsp); 1580 else 1581 fc_fcp_recovery(fsp); 1582 break; 1583 } 1584 fc_fcp_unlock_pkt(fsp); 1585out: 1586 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1587} 1588 1589/** 1590 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1591 * @fsp: The FCP pkt that needs to be aborted 1592 */ 1593static void fc_fcp_recovery(struct fc_fcp_pkt *fsp) 1594{ 1595 fsp->status_code = FC_CMD_RECOVERY; 1596 fsp->cdb_status = 0; 1597 fsp->io_status = 0; 1598 /* 1599 * if this fails then we let the scsi command timer fire and 1600 * scsi-ml escalate. 1601 */ 1602 fc_fcp_send_abort(fsp); 1603} 1604 1605/** 1606 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1607 * @fsp: The FCP packet the SRR is to be sent on 1608 * @r_ctl: The R_CTL field for the SRR request 1609 * This is called after receiving status but insufficient data, or 1610 * when expecting status but the request has timed out. 1611 */ 1612static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1613{ 1614 struct fc_lport *lport = fsp->lp; 1615 struct fc_rport *rport; 1616 struct fc_rport_libfc_priv *rpriv; 1617 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1618 struct fc_seq *seq; 1619 struct fcp_srr *srr; 1620 struct fc_frame *fp; 1621 u8 cdb_op; 1622 1623 rport = fsp->rport; 1624 rpriv = rport->dd_data; 1625 cdb_op = fsp->cdb_cmd.fc_cdb[0]; 1626 1627 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1628 rpriv->rp_state != RPORT_ST_READY) 1629 goto retry; /* shouldn't happen */ 1630 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1631 if (!fp) 1632 goto retry; 1633 1634 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1635 memset(srr, 0, sizeof(*srr)); 1636 srr->srr_op = ELS_SRR; 1637 srr->srr_ox_id = htons(ep->oxid); 1638 srr->srr_rx_id = htons(ep->rxid); 1639 srr->srr_r_ctl = r_ctl; 1640 srr->srr_rel_off = htonl(offset); 1641 1642 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1643 rpriv->local_port->port_id, FC_TYPE_FCP, 1644 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1645 1646 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, 1647 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); 1648 if (!seq) 1649 goto retry; 1650 1651 fsp->recov_seq = seq; 1652 fsp->xfer_len = offset; 1653 fsp->xfer_contig_end = offset; 1654 fsp->state &= ~FC_SRB_RCV_STATUS; 1655 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1656 return; 1657retry: 1658 fc_fcp_retry_cmd(fsp); 1659} 1660 1661/** 1662 * fc_fcp_srr_resp() - Handler for SRR response 1663 * @seq: The sequence the SRR is on 1664 * @fp: The SRR frame 1665 * @arg: The FCP packet the SRR is on 1666 */ 1667static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1668{ 1669 struct fc_fcp_pkt *fsp = arg; 1670 struct fc_frame_header *fh; 1671 1672 if (IS_ERR(fp)) { 1673 fc_fcp_srr_error(fsp, fp); 1674 return; 1675 } 1676 1677 if (fc_fcp_lock_pkt(fsp)) 1678 goto out; 1679 1680 fh = fc_frame_header_get(fp); 1681 /* 1682 * BUG? fc_fcp_srr_error calls exch_done which would release 1683 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1684 * then fc_exch_timeout would be sending an abort. The exch_done 1685 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1686 * an abort response though. 1687 */ 1688 if (fh->fh_type == FC_TYPE_BLS) { 1689 fc_fcp_unlock_pkt(fsp); 1690 return; 1691 } 1692 1693 fsp->recov_seq = NULL; 1694 switch (fc_frame_payload_op(fp)) { 1695 case ELS_LS_ACC: 1696 fsp->recov_retry = 0; 1697 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1698 break; 1699 case ELS_LS_RJT: 1700 default: 1701 fc_fcp_recovery(fsp); 1702 break; 1703 } 1704 fc_fcp_unlock_pkt(fsp); 1705 fsp->lp->tt.exch_done(seq); 1706out: 1707 fc_frame_free(fp); 1708 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1709} 1710 1711/** 1712 * fc_fcp_srr_error() - Handler for SRR errors 1713 * @fsp: The FCP packet that the SRR error is on 1714 * @fp: The SRR frame 1715 */ 1716static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1717{ 1718 if (fc_fcp_lock_pkt(fsp)) 1719 goto out; 1720 fsp->lp->tt.exch_done(fsp->recov_seq); 1721 fsp->recov_seq = NULL; 1722 switch (PTR_ERR(fp)) { 1723 case -FC_EX_TIMEOUT: 1724 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1725 fc_fcp_rec(fsp); 1726 else 1727 fc_fcp_recovery(fsp); 1728 break; 1729 case -FC_EX_CLOSED: /* e.g., link failure */ 1730 /* fall through */ 1731 default: 1732 fc_fcp_retry_cmd(fsp); 1733 break; 1734 } 1735 fc_fcp_unlock_pkt(fsp); 1736out: 1737 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1738} 1739 1740/** 1741 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1742 * @lport: The local port to be checked 1743 */ 1744static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1745{ 1746 /* lock ? */ 1747 return (lport->state == LPORT_ST_READY) && 1748 lport->link_up && !lport->qfull; 1749} 1750 1751/** 1752 * fc_queuecommand() - The queuecommand function of the SCSI template 1753 * @cmd: The scsi_cmnd to be executed 1754 * @done: The callback function to be called when the scsi_cmnd is complete 1755 * 1756 * This is the i/o strategy routine, called by the SCSI layer. This routine 1757 * is called with the host_lock held. 1758 */ 1759int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) 1760{ 1761 struct fc_lport *lport; 1762 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1763 struct fc_fcp_pkt *fsp; 1764 struct fc_rport_libfc_priv *rpriv; 1765 int rval; 1766 int rc = 0; 1767 struct fcoe_dev_stats *stats; 1768 1769 lport = shost_priv(sc_cmd->device->host); 1770 spin_unlock_irq(lport->host->host_lock); 1771 1772 rval = fc_remote_port_chkready(rport); 1773 if (rval) { 1774 sc_cmd->result = rval; 1775 done(sc_cmd); 1776 goto out; 1777 } 1778 1779 if (!*(struct fc_remote_port **)rport->dd_data) { 1780 /* 1781 * rport is transitioning from blocked/deleted to 1782 * online 1783 */ 1784 sc_cmd->result = DID_IMM_RETRY << 16; 1785 done(sc_cmd); 1786 goto out; 1787 } 1788 1789 rpriv = rport->dd_data; 1790 1791 if (!fc_fcp_lport_queue_ready(lport)) { 1792 if (lport->qfull) 1793 fc_fcp_can_queue_ramp_down(lport); 1794 rc = SCSI_MLQUEUE_HOST_BUSY; 1795 goto out; 1796 } 1797 1798 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1799 if (fsp == NULL) { 1800 rc = SCSI_MLQUEUE_HOST_BUSY; 1801 goto out; 1802 } 1803 1804 /* 1805 * build the libfc request pkt 1806 */ 1807 fsp->cmd = sc_cmd; /* save the cmd */ 1808 fsp->lp = lport; /* save the softc ptr */ 1809 fsp->rport = rport; /* set the remote port ptr */ 1810 fsp->xfer_ddp = FC_XID_UNKNOWN; 1811 sc_cmd->scsi_done = done; 1812 1813 /* 1814 * set up the transfer length 1815 */ 1816 fsp->data_len = scsi_bufflen(sc_cmd); 1817 fsp->xfer_len = 0; 1818 1819 /* 1820 * setup the data direction 1821 */ 1822 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1823 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1824 fsp->req_flags = FC_SRB_READ; 1825 stats->InputRequests++; 1826 stats->InputMegabytes = fsp->data_len; 1827 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1828 fsp->req_flags = FC_SRB_WRITE; 1829 stats->OutputRequests++; 1830 stats->OutputMegabytes = fsp->data_len; 1831 } else { 1832 fsp->req_flags = 0; 1833 stats->ControlRequests++; 1834 } 1835 put_cpu(); 1836 1837 fsp->tgt_flags = rpriv->flags; 1838 1839 init_timer(&fsp->timer); 1840 fsp->timer.data = (unsigned long)fsp; 1841 1842 /* 1843 * send it to the lower layer 1844 * if we get -1 return then put the request in the pending 1845 * queue. 1846 */ 1847 rval = fc_fcp_pkt_send(lport, fsp); 1848 if (rval != 0) { 1849 fsp->state = FC_SRB_FREE; 1850 fc_fcp_pkt_release(fsp); 1851 rc = SCSI_MLQUEUE_HOST_BUSY; 1852 } 1853out: 1854 spin_lock_irq(lport->host->host_lock); 1855 return rc; 1856} 1857EXPORT_SYMBOL(fc_queuecommand); 1858 1859/** 1860 * fc_io_compl() - Handle responses for completed commands 1861 * @fsp: The FCP packet that is complete 1862 * 1863 * Translates fcp_pkt errors to a Linux SCSI errors. 1864 * The fcp packet lock must be held when calling. 1865 */ 1866static void fc_io_compl(struct fc_fcp_pkt *fsp) 1867{ 1868 struct fc_fcp_internal *si; 1869 struct scsi_cmnd *sc_cmd; 1870 struct fc_lport *lport; 1871 unsigned long flags; 1872 1873 /* release outstanding ddp context */ 1874 fc_fcp_ddp_done(fsp); 1875 1876 fsp->state |= FC_SRB_COMPL; 1877 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1878 spin_unlock_bh(&fsp->scsi_pkt_lock); 1879 del_timer_sync(&fsp->timer); 1880 spin_lock_bh(&fsp->scsi_pkt_lock); 1881 } 1882 1883 lport = fsp->lp; 1884 si = fc_get_scsi_internal(lport); 1885 if (!fsp->cmd) 1886 return; 1887 1888 /* 1889 * if can_queue ramp down is done then try can_queue ramp up 1890 * since commands are completing now. 1891 */ 1892 if (si->last_can_queue_ramp_down_time) 1893 fc_fcp_can_queue_ramp_up(lport); 1894 1895 sc_cmd = fsp->cmd; 1896 fsp->cmd = NULL; 1897 1898 if (!sc_cmd->SCp.ptr) 1899 return; 1900 1901 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1902 switch (fsp->status_code) { 1903 case FC_COMPLETE: 1904 if (fsp->cdb_status == 0) { 1905 /* 1906 * good I/O status 1907 */ 1908 sc_cmd->result = DID_OK << 16; 1909 if (fsp->scsi_resid) 1910 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1911 } else { 1912 /* 1913 * transport level I/O was ok but scsi 1914 * has non zero status 1915 */ 1916 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1917 } 1918 break; 1919 case FC_ERROR: 1920 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1921 "due to FC_ERROR\n"); 1922 sc_cmd->result = DID_ERROR << 16; 1923 break; 1924 case FC_DATA_UNDRUN: 1925 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1926 /* 1927 * scsi status is good but transport level 1928 * underrun. 1929 */ 1930 if (fsp->state & FC_SRB_RCV_STATUS) { 1931 sc_cmd->result = DID_OK << 16; 1932 } else { 1933 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 1934 " due to FC_DATA_UNDRUN (trans)\n"); 1935 sc_cmd->result = DID_ERROR << 16; 1936 } 1937 } else { 1938 /* 1939 * scsi got underrun, this is an error 1940 */ 1941 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1942 "due to FC_DATA_UNDRUN (scsi)\n"); 1943 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1944 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1945 } 1946 break; 1947 case FC_DATA_OVRRUN: 1948 /* 1949 * overrun is an error 1950 */ 1951 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1952 "due to FC_DATA_OVRRUN\n"); 1953 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1954 break; 1955 case FC_CMD_ABORTED: 1956 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1957 "due to FC_CMD_ABORTED\n"); 1958 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1959 break; 1960 case FC_CMD_RECOVERY: 1961 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1962 break; 1963 case FC_CMD_RESET: 1964 sc_cmd->result = (DID_RESET << 16); 1965 break; 1966 case FC_HRD_ERROR: 1967 sc_cmd->result = (DID_NO_CONNECT << 16); 1968 break; 1969 default: 1970 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1971 "due to unknown error\n"); 1972 sc_cmd->result = (DID_ERROR << 16); 1973 break; 1974 } 1975 1976 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1977 list_del(&fsp->list); 1978 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1979 sc_cmd->SCp.ptr = NULL; 1980 sc_cmd->scsi_done(sc_cmd); 1981 1982 /* release ref from initial allocation in queue command */ 1983 fc_fcp_pkt_release(fsp); 1984} 1985 1986/** 1987 * fc_eh_abort() - Abort a command 1988 * @sc_cmd: The SCSI command to abort 1989 * 1990 * From SCSI host template. 1991 * Send an ABTS to the target device and wait for the response. 1992 */ 1993int fc_eh_abort(struct scsi_cmnd *sc_cmd) 1994{ 1995 struct fc_fcp_pkt *fsp; 1996 struct fc_lport *lport; 1997 int rc = FAILED; 1998 unsigned long flags; 1999 2000 lport = shost_priv(sc_cmd->device->host); 2001 if (lport->state != LPORT_ST_READY) 2002 return rc; 2003 else if (!lport->link_up) 2004 return rc; 2005 2006 spin_lock_irqsave(lport->host->host_lock, flags); 2007 fsp = CMD_SP(sc_cmd); 2008 if (!fsp) { 2009 /* command completed while scsi eh was setting up */ 2010 spin_unlock_irqrestore(lport->host->host_lock, flags); 2011 return SUCCESS; 2012 } 2013 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 2014 fc_fcp_pkt_hold(fsp); 2015 spin_unlock_irqrestore(lport->host->host_lock, flags); 2016 2017 if (fc_fcp_lock_pkt(fsp)) { 2018 /* completed while we were waiting for timer to be deleted */ 2019 rc = SUCCESS; 2020 goto release_pkt; 2021 } 2022 2023 rc = fc_fcp_pkt_abort(fsp); 2024 fc_fcp_unlock_pkt(fsp); 2025 2026release_pkt: 2027 fc_fcp_pkt_release(fsp); 2028 return rc; 2029} 2030EXPORT_SYMBOL(fc_eh_abort); 2031 2032/** 2033 * fc_eh_device_reset() - Reset a single LUN 2034 * @sc_cmd: The SCSI command which identifies the device whose 2035 * LUN is to be reset 2036 * 2037 * Set from SCSI host template. 2038 */ 2039int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2040{ 2041 struct fc_lport *lport; 2042 struct fc_fcp_pkt *fsp; 2043 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2044 int rc = FAILED; 2045 int rval; 2046 2047 rval = fc_remote_port_chkready(rport); 2048 if (rval) 2049 goto out; 2050 2051 lport = shost_priv(sc_cmd->device->host); 2052 2053 if (lport->state != LPORT_ST_READY) 2054 return rc; 2055 2056 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2057 2058 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2059 if (fsp == NULL) { 2060 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2061 goto out; 2062 } 2063 2064 /* 2065 * Build the libfc request pkt. Do not set the scsi cmnd, because 2066 * the sc passed in is not setup for execution like when sent 2067 * through the queuecommand callout. 2068 */ 2069 fsp->lp = lport; /* save the softc ptr */ 2070 fsp->rport = rport; /* set the remote port ptr */ 2071 2072 /* 2073 * flush outstanding commands 2074 */ 2075 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2076 fsp->state = FC_SRB_FREE; 2077 fc_fcp_pkt_release(fsp); 2078 2079out: 2080 return rc; 2081} 2082EXPORT_SYMBOL(fc_eh_device_reset); 2083 2084/** 2085 * fc_eh_host_reset() - Reset a Scsi_Host. 2086 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2087 */ 2088int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2089{ 2090 struct Scsi_Host *shost = sc_cmd->device->host; 2091 struct fc_lport *lport = shost_priv(shost); 2092 unsigned long wait_tmo; 2093 2094 FC_SCSI_DBG(lport, "Resetting host\n"); 2095 2096 lport->tt.lport_reset(lport); 2097 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2098 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2099 wait_tmo)) 2100 msleep(1000); 2101 2102 if (fc_fcp_lport_queue_ready(lport)) { 2103 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2104 "on port (%6.6x)\n", lport->port_id); 2105 return SUCCESS; 2106 } else { 2107 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2108 "port (%6.6x) is not ready.\n", 2109 lport->port_id); 2110 return FAILED; 2111 } 2112} 2113EXPORT_SYMBOL(fc_eh_host_reset); 2114 2115/** 2116 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2117 * @sdev: The SCSI device that identifies the SCSI host 2118 * 2119 * Configures queue depth based on host's cmd_per_len. If not set 2120 * then we use the libfc default. 2121 */ 2122int fc_slave_alloc(struct scsi_device *sdev) 2123{ 2124 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2125 2126 if (!rport || fc_remote_port_chkready(rport)) 2127 return -ENXIO; 2128 2129 if (sdev->tagged_supported) 2130 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2131 else 2132 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2133 FC_FCP_DFLT_QUEUE_DEPTH); 2134 2135 return 0; 2136} 2137EXPORT_SYMBOL(fc_slave_alloc); 2138 2139/** 2140 * fc_change_queue_depth() - Change a device's queue depth 2141 * @sdev: The SCSI device whose queue depth is to change 2142 * @qdepth: The new queue depth 2143 * @reason: The resason for the change 2144 */ 2145int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2146{ 2147 switch (reason) { 2148 case SCSI_QDEPTH_DEFAULT: 2149 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2150 break; 2151 case SCSI_QDEPTH_QFULL: 2152 scsi_track_queue_full(sdev, qdepth); 2153 break; 2154 case SCSI_QDEPTH_RAMP_UP: 2155 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2156 break; 2157 default: 2158 return -EOPNOTSUPP; 2159 } 2160 return sdev->queue_depth; 2161} 2162EXPORT_SYMBOL(fc_change_queue_depth); 2163 2164/** 2165 * fc_change_queue_type() - Change a device's queue type 2166 * @sdev: The SCSI device whose queue depth is to change 2167 * @tag_type: Identifier for queue type 2168 */ 2169int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2170{ 2171 if (sdev->tagged_supported) { 2172 scsi_set_tag_type(sdev, tag_type); 2173 if (tag_type) 2174 scsi_activate_tcq(sdev, sdev->queue_depth); 2175 else 2176 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2177 } else 2178 tag_type = 0; 2179 2180 return tag_type; 2181} 2182EXPORT_SYMBOL(fc_change_queue_type); 2183 2184/** 2185 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2186 * @lport: The local port that no longer needs the FCP layer 2187 */ 2188void fc_fcp_destroy(struct fc_lport *lport) 2189{ 2190 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2191 2192 if (!list_empty(&si->scsi_pkt_queue)) 2193 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2194 "port (%6.6x)\n", lport->port_id); 2195 2196 mempool_destroy(si->scsi_pkt_pool); 2197 kfree(si); 2198 lport->scsi_priv = NULL; 2199} 2200EXPORT_SYMBOL(fc_fcp_destroy); 2201 2202int fc_setup_fcp() 2203{ 2204 int rc = 0; 2205 2206 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2207 sizeof(struct fc_fcp_pkt), 2208 0, SLAB_HWCACHE_ALIGN, NULL); 2209 if (!scsi_pkt_cachep) { 2210 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2211 "module load failed!"); 2212 rc = -ENOMEM; 2213 } 2214 2215 return rc; 2216} 2217 2218void fc_destroy_fcp() 2219{ 2220 if (scsi_pkt_cachep) 2221 kmem_cache_destroy(scsi_pkt_cachep); 2222} 2223 2224/** 2225 * fc_fcp_init() - Initialize the FCP layer for a local port 2226 * @lport: The local port to initialize the exchange layer for 2227 */ 2228int fc_fcp_init(struct fc_lport *lport) 2229{ 2230 int rc; 2231 struct fc_fcp_internal *si; 2232 2233 if (!lport->tt.fcp_cmd_send) 2234 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2235 2236 if (!lport->tt.fcp_cleanup) 2237 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2238 2239 if (!lport->tt.fcp_abort_io) 2240 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2241 2242 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2243 if (!si) 2244 return -ENOMEM; 2245 lport->scsi_priv = si; 2246 si->max_can_queue = lport->host->can_queue; 2247 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2248 spin_lock_init(&si->scsi_queue_lock); 2249 2250 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2251 if (!si->scsi_pkt_pool) { 2252 rc = -ENOMEM; 2253 goto free_internal; 2254 } 2255 return 0; 2256 2257free_internal: 2258 kfree(si); 2259 return rc; 2260} 2261EXPORT_SYMBOL(fc_fcp_init); 2262