fc_fcp.c revision 3a91090fe0df10091c5612db8528ee7a822ab83d
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/* constant added to e_d_tov timeout to get rec_tov value */ 61#define REC_TOV_CONST 1 62 63/* 64 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock 65 */ 66#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 67#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 68#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 69#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 70#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 71 72/** 73 * struct fc_fcp_internal - FCP layer internal data 74 * @scsi_pkt_pool: Memory pool to draw FCP packets from 75 * @scsi_queue_lock: Protects the scsi_pkt_queue 76 * @scsi_pkt_queue: Current FCP packets 77 * @last_can_queue_ramp_down_time: ramp down time 78 * @last_can_queue_ramp_up_time: ramp up time 79 * @max_can_queue: max can_queue size 80 */ 81struct fc_fcp_internal { 82 mempool_t *scsi_pkt_pool; 83 spinlock_t scsi_queue_lock; 84 struct list_head scsi_pkt_queue; 85 unsigned long last_can_queue_ramp_down_time; 86 unsigned long last_can_queue_ramp_up_time; 87 int max_can_queue; 88}; 89 90#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 91 92/* 93 * function prototypes 94 * FC scsi I/O related functions 95 */ 96static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 97static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 98static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 99static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 100static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 101static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 102static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); 103static void fc_fcp_timeout(unsigned long); 104static void fc_fcp_rec(struct fc_fcp_pkt *); 105static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 106static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 107static void fc_io_compl(struct fc_fcp_pkt *); 108 109static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 110static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 111static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 112 113/* 114 * command status codes 115 */ 116#define FC_COMPLETE 0 117#define FC_CMD_ABORTED 1 118#define FC_CMD_RESET 2 119#define FC_CMD_PLOGO 3 120#define FC_SNS_RCV 4 121#define FC_TRANS_ERR 5 122#define FC_DATA_OVRRUN 6 123#define FC_DATA_UNDRUN 7 124#define FC_ERROR 8 125#define FC_HRD_ERROR 9 126#define FC_CRC_ERROR 10 127#define FC_TIMED_OUT 11 128 129/* 130 * Error recovery timeout values. 131 */ 132#define FC_SCSI_TM_TOV (10 * HZ) 133#define FC_HOST_RESET_TIMEOUT (30 * HZ) 134#define FC_CAN_QUEUE_PERIOD (60 * HZ) 135 136#define FC_MAX_ERROR_CNT 5 137#define FC_MAX_RECOV_RETRY 3 138 139#define FC_FCP_DFLT_QUEUE_DEPTH 32 140 141/** 142 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 143 * @lport: The local port that the FCP packet is for 144 * @gfp: GFP flags for allocation 145 * 146 * Return value: fcp_pkt structure or null on allocation failure. 147 * Context: Can be called from process context, no lock is required. 148 */ 149static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 150{ 151 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 152 struct fc_fcp_pkt *fsp; 153 154 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 155 if (fsp) { 156 memset(fsp, 0, sizeof(*fsp)); 157 fsp->lp = lport; 158 atomic_set(&fsp->ref_cnt, 1); 159 init_timer(&fsp->timer); 160 INIT_LIST_HEAD(&fsp->list); 161 spin_lock_init(&fsp->scsi_pkt_lock); 162 } 163 return fsp; 164} 165 166/** 167 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 168 * @fsp: The FCP packet to be released 169 * 170 * Context: Can be called from process or interrupt context, 171 * no lock is required. 172 */ 173static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 174{ 175 if (atomic_dec_and_test(&fsp->ref_cnt)) { 176 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 177 178 mempool_free(fsp, si->scsi_pkt_pool); 179 } 180} 181 182/** 183 * fc_fcp_pkt_hold() - Hold a fcp_pkt 184 * @fsp: The FCP packet to be held 185 */ 186static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 187{ 188 atomic_inc(&fsp->ref_cnt); 189} 190 191/** 192 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 193 * @seq: The sequence that the FCP packet is on (required by destructor API) 194 * @fsp: The FCP packet to be released 195 * 196 * This routine is called by a destructor callback in the exch_seq_send() 197 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 198 * argument even though it is not used by this routine. 199 * 200 * Context: No locking required. 201 */ 202static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 203{ 204 fc_fcp_pkt_release(fsp); 205} 206 207/** 208 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 209 * @fsp: The FCP packet to be locked and incremented 210 * 211 * We should only return error if we return a command to SCSI-ml before 212 * getting a response. This can happen in cases where we send a abort, but 213 * do not wait for the response and the abort and command can be passing 214 * each other on the wire/network-layer. 215 * 216 * Note: this function locks the packet and gets a reference to allow 217 * callers to call the completion function while the lock is held and 218 * not have to worry about the packets refcount. 219 * 220 * TODO: Maybe we should just have callers grab/release the lock and 221 * have a function that they call to verify the fsp and grab a ref if 222 * needed. 223 */ 224static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 225{ 226 spin_lock_bh(&fsp->scsi_pkt_lock); 227 if (fsp->state & FC_SRB_COMPL) { 228 spin_unlock_bh(&fsp->scsi_pkt_lock); 229 return -EPERM; 230 } 231 232 fc_fcp_pkt_hold(fsp); 233 return 0; 234} 235 236/** 237 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 238 * reference count 239 * @fsp: The FCP packet to be unlocked and decremented 240 */ 241static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 242{ 243 spin_unlock_bh(&fsp->scsi_pkt_lock); 244 fc_fcp_pkt_release(fsp); 245} 246 247/** 248 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 249 * @fsp: The FCP packet to start a timer for 250 * @delay: The timeout period for the timer 251 */ 252static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 253{ 254 if (!(fsp->state & FC_SRB_COMPL)) 255 mod_timer(&fsp->timer, jiffies + delay); 256} 257 258/** 259 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 260 * fcp_pkt 261 * @fsp: The FCP packet to abort exchanges on 262 */ 263static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 264{ 265 if (!fsp->seq_ptr) 266 return -EINVAL; 267 268 fsp->state |= FC_SRB_ABORT_PENDING; 269 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 270} 271 272/** 273 * fc_fcp_retry_cmd() - Retry a fcp_pkt 274 * @fsp: The FCP packet to be retried 275 * 276 * Sets the status code to be FC_ERROR and then calls 277 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 278 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 279 * The SCSI-ml will retry the command. 280 */ 281static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 282{ 283 if (fsp->seq_ptr) { 284 fsp->lp->tt.exch_done(fsp->seq_ptr); 285 fsp->seq_ptr = NULL; 286 } 287 288 fsp->state &= ~FC_SRB_ABORT_PENDING; 289 fsp->io_status = 0; 290 fsp->status_code = FC_ERROR; 291 fc_fcp_complete_locked(fsp); 292} 293 294/** 295 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 296 * @fsp: The FCP packet that will manage the DDP frames 297 * @xid: The XID that will be used for the DDP exchange 298 */ 299void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 300{ 301 struct fc_lport *lport; 302 303 lport = fsp->lp; 304 if ((fsp->req_flags & FC_SRB_READ) && 305 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 306 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 307 scsi_sg_count(fsp->cmd))) 308 fsp->xfer_ddp = xid; 309 } 310} 311 312/** 313 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 314 * DDP related resources for a fcp_pkt 315 * @fsp: The FCP packet that DDP had been used on 316 */ 317static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 318{ 319 struct fc_lport *lport; 320 321 if (!fsp) 322 return; 323 324 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 325 return; 326 327 lport = fsp->lp; 328 if (lport->tt.ddp_done) { 329 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 330 fsp->xfer_ddp = FC_XID_UNKNOWN; 331 } 332} 333 334/** 335 * fc_fcp_can_queue_ramp_up() - increases can_queue 336 * @lport: lport to ramp up can_queue 337 * 338 * Locking notes: Called with Scsi_Host lock held 339 */ 340static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 341{ 342 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 343 int can_queue; 344 345 if (si->last_can_queue_ramp_up_time && 346 (time_before(jiffies, si->last_can_queue_ramp_up_time + 347 FC_CAN_QUEUE_PERIOD))) 348 return; 349 350 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 351 FC_CAN_QUEUE_PERIOD)) 352 return; 353 354 si->last_can_queue_ramp_up_time = jiffies; 355 356 can_queue = lport->host->can_queue << 1; 357 if (can_queue >= si->max_can_queue) { 358 can_queue = si->max_can_queue; 359 si->last_can_queue_ramp_down_time = 0; 360 } 361 lport->host->can_queue = can_queue; 362 shost_printk(KERN_ERR, lport->host, "libfc: increased " 363 "can_queue to %d.\n", can_queue); 364} 365 366/** 367 * fc_fcp_can_queue_ramp_down() - reduces can_queue 368 * @lport: lport to reduce can_queue 369 * 370 * If we are getting memory allocation failures, then we may 371 * be trying to execute too many commands. We let the running 372 * commands complete or timeout, then try again with a reduced 373 * can_queue. Eventually we will hit the point where we run 374 * on all reserved structs. 375 * 376 * Locking notes: Called with Scsi_Host lock held 377 */ 378static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 379{ 380 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 381 int can_queue; 382 383 if (si->last_can_queue_ramp_down_time && 384 (time_before(jiffies, si->last_can_queue_ramp_down_time + 385 FC_CAN_QUEUE_PERIOD))) 386 return; 387 388 si->last_can_queue_ramp_down_time = jiffies; 389 390 can_queue = lport->host->can_queue; 391 can_queue >>= 1; 392 if (!can_queue) 393 can_queue = 1; 394 lport->host->can_queue = can_queue; 395 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 396 "Reducing can_queue to %d.\n", can_queue); 397} 398 399/* 400 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 401 * @lport: fc lport struct 402 * @len: payload length 403 * 404 * Allocates fc_frame structure and buffer but if fails to allocate 405 * then reduce can_queue. 406 */ 407static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 408 size_t len) 409{ 410 struct fc_frame *fp; 411 unsigned long flags; 412 413 fp = fc_frame_alloc(lport, len); 414 if (likely(fp)) 415 return fp; 416 417 /* error case */ 418 spin_lock_irqsave(lport->host->host_lock, flags); 419 fc_fcp_can_queue_ramp_down(lport); 420 spin_unlock_irqrestore(lport->host->host_lock, flags); 421 return NULL; 422} 423 424/** 425 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 426 * @fsp: The FCP packet the data is on 427 * @fp: The data frame 428 */ 429static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 430{ 431 struct scsi_cmnd *sc = fsp->cmd; 432 struct fc_lport *lport = fsp->lp; 433 struct fcoe_dev_stats *stats; 434 struct fc_frame_header *fh; 435 size_t start_offset; 436 size_t offset; 437 u32 crc; 438 u32 copy_len = 0; 439 size_t len; 440 void *buf; 441 struct scatterlist *sg; 442 u32 nents; 443 u8 host_bcode = FC_COMPLETE; 444 445 fh = fc_frame_header_get(fp); 446 offset = ntohl(fh->fh_parm_offset); 447 start_offset = offset; 448 len = fr_len(fp) - sizeof(*fh); 449 buf = fc_frame_payload_get(fp, 0); 450 451 /* 452 * if this I/O is ddped then clear it and initiate recovery since data 453 * frames are expected to be placed directly in that case. 454 * 455 * Indicate error to scsi-ml because something went wrong with the 456 * ddp handling to get us here. 457 */ 458 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 459 fc_fcp_ddp_done(fsp); 460 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 461 host_bcode = FC_ERROR; 462 goto err; 463 } 464 if (offset + len > fsp->data_len) { 465 /* this should never happen */ 466 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 467 fc_frame_crc_check(fp)) 468 goto crc_err; 469 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 470 "data_len %x\n", len, offset, fsp->data_len); 471 472 /* Data is corrupted indicate scsi-ml should retry */ 473 host_bcode = FC_DATA_OVRRUN; 474 goto err; 475 } 476 if (offset != fsp->xfer_len) 477 fsp->state |= FC_SRB_DISCONTIG; 478 479 sg = scsi_sglist(sc); 480 nents = scsi_sg_count(sc); 481 482 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 483 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 484 &offset, KM_SOFTIRQ0, NULL); 485 } else { 486 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 487 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 488 &offset, KM_SOFTIRQ0, &crc); 489 buf = fc_frame_payload_get(fp, 0); 490 if (len % 4) 491 crc = crc32(crc, buf + len, 4 - (len % 4)); 492 493 if (~crc != le32_to_cpu(fr_crc(fp))) { 494crc_err: 495 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 496 stats->ErrorFrames++; 497 /* per cpu count, not total count, but OK for limit */ 498 if (stats->InvalidCRCCount++ < 5) 499 printk(KERN_WARNING "libfc: CRC error on data " 500 "frame for port (%6.6x)\n", 501 lport->port_id); 502 put_cpu(); 503 /* 504 * Assume the frame is total garbage. 505 * We may have copied it over the good part 506 * of the buffer. 507 * If so, we need to retry the entire operation. 508 * Otherwise, ignore it. 509 */ 510 if (fsp->state & FC_SRB_DISCONTIG) { 511 host_bcode = FC_CRC_ERROR; 512 goto err; 513 } 514 return; 515 } 516 } 517 518 if (fsp->xfer_contig_end == start_offset) 519 fsp->xfer_contig_end += copy_len; 520 fsp->xfer_len += copy_len; 521 522 /* 523 * In the very rare event that this data arrived after the response 524 * and completes the transfer, call the completion handler. 525 */ 526 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 527 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 528 fc_fcp_complete_locked(fsp); 529 return; 530err: 531 fc_fcp_recovery(fsp, host_bcode); 532} 533 534/** 535 * fc_fcp_send_data() - Send SCSI data to a target 536 * @fsp: The FCP packet the data is on 537 * @sp: The sequence the data is to be sent on 538 * @offset: The starting offset for this data request 539 * @seq_blen: The burst length for this data request 540 * 541 * Called after receiving a Transfer Ready data descriptor. 542 * If the LLD is capable of sequence offload then send down the 543 * seq_blen amount of data in single frame, otherwise send 544 * multiple frames of the maximum frame payload supported by 545 * the target port. 546 */ 547static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 548 size_t offset, size_t seq_blen) 549{ 550 struct fc_exch *ep; 551 struct scsi_cmnd *sc; 552 struct scatterlist *sg; 553 struct fc_frame *fp = NULL; 554 struct fc_lport *lport = fsp->lp; 555 struct page *page; 556 size_t remaining; 557 size_t t_blen; 558 size_t tlen; 559 size_t sg_bytes; 560 size_t frame_offset, fh_parm_offset; 561 size_t off; 562 int error; 563 void *data = NULL; 564 void *page_addr; 565 int using_sg = lport->sg_supp; 566 u32 f_ctl; 567 568 WARN_ON(seq_blen <= 0); 569 if (unlikely(offset + seq_blen > fsp->data_len)) { 570 /* this should never happen */ 571 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 572 "offset %zx\n", seq_blen, offset); 573 fc_fcp_send_abort(fsp); 574 return 0; 575 } else if (offset != fsp->xfer_len) { 576 /* Out of Order Data Request - no problem, but unexpected. */ 577 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 578 "seq_blen %zx offset %zx\n", seq_blen, offset); 579 } 580 581 /* 582 * if LLD is capable of seq_offload then set transport 583 * burst length (t_blen) to seq_blen, otherwise set t_blen 584 * to max FC frame payload previously set in fsp->max_payload. 585 */ 586 t_blen = fsp->max_payload; 587 if (lport->seq_offload) { 588 t_blen = min(seq_blen, (size_t)lport->lso_max); 589 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 590 fsp, seq_blen, lport->lso_max, t_blen); 591 } 592 593 if (t_blen > 512) 594 t_blen &= ~(512 - 1); /* round down to block size */ 595 sc = fsp->cmd; 596 597 remaining = seq_blen; 598 fh_parm_offset = frame_offset = offset; 599 tlen = 0; 600 seq = lport->tt.seq_start_next(seq); 601 f_ctl = FC_FC_REL_OFF; 602 WARN_ON(!seq); 603 604 sg = scsi_sglist(sc); 605 606 while (remaining > 0 && sg) { 607 if (offset >= sg->length) { 608 offset -= sg->length; 609 sg = sg_next(sg); 610 continue; 611 } 612 if (!fp) { 613 tlen = min(t_blen, remaining); 614 615 /* 616 * TODO. Temporary workaround. fc_seq_send() can't 617 * handle odd lengths in non-linear skbs. 618 * This will be the final fragment only. 619 */ 620 if (tlen % 4) 621 using_sg = 0; 622 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 623 if (!fp) 624 return -ENOMEM; 625 626 data = fc_frame_header_get(fp) + 1; 627 fh_parm_offset = frame_offset; 628 fr_max_payload(fp) = fsp->max_payload; 629 } 630 631 off = offset + sg->offset; 632 sg_bytes = min(tlen, sg->length - offset); 633 sg_bytes = min(sg_bytes, 634 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 635 page = sg_page(sg) + (off >> PAGE_SHIFT); 636 if (using_sg) { 637 get_page(page); 638 skb_fill_page_desc(fp_skb(fp), 639 skb_shinfo(fp_skb(fp))->nr_frags, 640 page, off & ~PAGE_MASK, sg_bytes); 641 fp_skb(fp)->data_len += sg_bytes; 642 fr_len(fp) += sg_bytes; 643 fp_skb(fp)->truesize += PAGE_SIZE; 644 } else { 645 /* 646 * The scatterlist item may be bigger than PAGE_SIZE, 647 * but we must not cross pages inside the kmap. 648 */ 649 page_addr = kmap_atomic(page, KM_SOFTIRQ0); 650 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 651 sg_bytes); 652 kunmap_atomic(page_addr, KM_SOFTIRQ0); 653 data += sg_bytes; 654 } 655 offset += sg_bytes; 656 frame_offset += sg_bytes; 657 tlen -= sg_bytes; 658 remaining -= sg_bytes; 659 660 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 661 (tlen)) 662 continue; 663 664 /* 665 * Send sequence with transfer sequence initiative in case 666 * this is last FCP frame of the sequence. 667 */ 668 if (remaining == 0) 669 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 670 671 ep = fc_seq_exch(seq); 672 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 673 FC_TYPE_FCP, f_ctl, fh_parm_offset); 674 675 /* 676 * send fragment using for a sequence. 677 */ 678 error = lport->tt.seq_send(lport, seq, fp); 679 if (error) { 680 WARN_ON(1); /* send error should be rare */ 681 fc_fcp_retry_cmd(fsp); 682 return 0; 683 } 684 fp = NULL; 685 } 686 fsp->xfer_len += seq_blen; /* premature count? */ 687 return 0; 688} 689 690/** 691 * fc_fcp_abts_resp() - Send an ABTS response 692 * @fsp: The FCP packet that is being aborted 693 * @fp: The response frame 694 */ 695static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 696{ 697 int ba_done = 1; 698 struct fc_ba_rjt *brp; 699 struct fc_frame_header *fh; 700 701 fh = fc_frame_header_get(fp); 702 switch (fh->fh_r_ctl) { 703 case FC_RCTL_BA_ACC: 704 break; 705 case FC_RCTL_BA_RJT: 706 brp = fc_frame_payload_get(fp, sizeof(*brp)); 707 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 708 break; 709 /* fall thru */ 710 default: 711 /* 712 * we will let the command timeout 713 * and scsi-ml recover in this case, 714 * therefore cleared the ba_done flag. 715 */ 716 ba_done = 0; 717 } 718 719 if (ba_done) { 720 fsp->state |= FC_SRB_ABORTED; 721 fsp->state &= ~FC_SRB_ABORT_PENDING; 722 723 if (fsp->wait_for_comp) 724 complete(&fsp->tm_done); 725 else 726 fc_fcp_complete_locked(fsp); 727 } 728} 729 730/** 731 * fc_fcp_recv() - Reveive an FCP frame 732 * @seq: The sequence the frame is on 733 * @fp: The received frame 734 * @arg: The related FCP packet 735 * 736 * Context: Called from Soft IRQ context. Can not be called 737 * holding the FCP packet list lock. 738 */ 739static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 740{ 741 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 742 struct fc_lport *lport = fsp->lp; 743 struct fc_frame_header *fh; 744 struct fcp_txrdy *dd; 745 u8 r_ctl; 746 int rc = 0; 747 748 if (IS_ERR(fp)) { 749 fc_fcp_error(fsp, fp); 750 return; 751 } 752 753 fh = fc_frame_header_get(fp); 754 r_ctl = fh->fh_r_ctl; 755 756 if (lport->state != LPORT_ST_READY) 757 goto out; 758 if (fc_fcp_lock_pkt(fsp)) 759 goto out; 760 fsp->last_pkt_time = jiffies; 761 762 if (fh->fh_type == FC_TYPE_BLS) { 763 fc_fcp_abts_resp(fsp, fp); 764 goto unlock; 765 } 766 767 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 768 goto unlock; 769 770 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 771 /* 772 * received XFER RDY from the target 773 * need to send data to the target 774 */ 775 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 776 dd = fc_frame_payload_get(fp, sizeof(*dd)); 777 WARN_ON(!dd); 778 779 rc = fc_fcp_send_data(fsp, seq, 780 (size_t) ntohl(dd->ft_data_ro), 781 (size_t) ntohl(dd->ft_burst_len)); 782 if (!rc) 783 seq->rec_data = fsp->xfer_len; 784 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 785 /* 786 * received a DATA frame 787 * next we will copy the data to the system buffer 788 */ 789 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 790 fc_fcp_recv_data(fsp, fp); 791 seq->rec_data = fsp->xfer_contig_end; 792 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 793 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 794 795 fc_fcp_resp(fsp, fp); 796 } else { 797 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 798 } 799unlock: 800 fc_fcp_unlock_pkt(fsp); 801out: 802 fc_frame_free(fp); 803} 804 805/** 806 * fc_fcp_resp() - Handler for FCP responses 807 * @fsp: The FCP packet the response is for 808 * @fp: The response frame 809 */ 810static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 811{ 812 struct fc_frame_header *fh; 813 struct fcp_resp *fc_rp; 814 struct fcp_resp_ext *rp_ex; 815 struct fcp_resp_rsp_info *fc_rp_info; 816 u32 plen; 817 u32 expected_len; 818 u32 respl = 0; 819 u32 snsl = 0; 820 u8 flags = 0; 821 822 plen = fr_len(fp); 823 fh = (struct fc_frame_header *)fr_hdr(fp); 824 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 825 goto len_err; 826 plen -= sizeof(*fh); 827 fc_rp = (struct fcp_resp *)(fh + 1); 828 fsp->cdb_status = fc_rp->fr_status; 829 flags = fc_rp->fr_flags; 830 fsp->scsi_comp_flags = flags; 831 expected_len = fsp->data_len; 832 833 /* if ddp, update xfer len */ 834 fc_fcp_ddp_done(fsp); 835 836 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 837 rp_ex = (void *)(fc_rp + 1); 838 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 839 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 840 goto len_err; 841 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 842 if (flags & FCP_RSP_LEN_VAL) { 843 respl = ntohl(rp_ex->fr_rsp_len); 844 if (respl != sizeof(*fc_rp_info)) 845 goto len_err; 846 if (fsp->wait_for_comp) { 847 /* Abuse cdb_status for rsp code */ 848 fsp->cdb_status = fc_rp_info->rsp_code; 849 complete(&fsp->tm_done); 850 /* 851 * tmfs will not have any scsi cmd so 852 * exit here 853 */ 854 return; 855 } 856 } 857 if (flags & FCP_SNS_LEN_VAL) { 858 snsl = ntohl(rp_ex->fr_sns_len); 859 if (snsl > SCSI_SENSE_BUFFERSIZE) 860 snsl = SCSI_SENSE_BUFFERSIZE; 861 memcpy(fsp->cmd->sense_buffer, 862 (char *)fc_rp_info + respl, snsl); 863 } 864 } 865 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 866 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 867 goto len_err; 868 if (flags & FCP_RESID_UNDER) { 869 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 870 /* 871 * The cmnd->underflow is the minimum number of 872 * bytes that must be transfered for this 873 * command. Provided a sense condition is not 874 * present, make sure the actual amount 875 * transferred is at least the underflow value 876 * or fail. 877 */ 878 if (!(flags & FCP_SNS_LEN_VAL) && 879 (fc_rp->fr_status == 0) && 880 (scsi_bufflen(fsp->cmd) - 881 fsp->scsi_resid) < fsp->cmd->underflow) 882 goto err; 883 expected_len -= fsp->scsi_resid; 884 } else { 885 fsp->status_code = FC_ERROR; 886 } 887 } 888 } 889 fsp->state |= FC_SRB_RCV_STATUS; 890 891 /* 892 * Check for missing or extra data frames. 893 */ 894 if (unlikely(fsp->xfer_len != expected_len)) { 895 if (fsp->xfer_len < expected_len) { 896 /* 897 * Some data may be queued locally, 898 * Wait a at least one jiffy to see if it is delivered. 899 * If this expires without data, we may do SRR. 900 */ 901 fc_fcp_timer_set(fsp, 2); 902 return; 903 } 904 fsp->status_code = FC_DATA_OVRRUN; 905 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 906 "len %x, data len %x\n", 907 fsp->rport->port_id, 908 fsp->xfer_len, expected_len, fsp->data_len); 909 } 910 fc_fcp_complete_locked(fsp); 911 return; 912 913len_err: 914 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 915 "snsl %u\n", flags, fr_len(fp), respl, snsl); 916err: 917 fsp->status_code = FC_ERROR; 918 fc_fcp_complete_locked(fsp); 919} 920 921/** 922 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 923 * fcp_pkt lock held 924 * @fsp: The FCP packet to be completed 925 * 926 * This function may sleep if a timer is pending. The packet lock must be 927 * held, and the host lock must not be held. 928 */ 929static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 930{ 931 struct fc_lport *lport = fsp->lp; 932 struct fc_seq *seq; 933 struct fc_exch *ep; 934 u32 f_ctl; 935 936 if (fsp->state & FC_SRB_ABORT_PENDING) 937 return; 938 939 if (fsp->state & FC_SRB_ABORTED) { 940 if (!fsp->status_code) 941 fsp->status_code = FC_CMD_ABORTED; 942 } else { 943 /* 944 * Test for transport underrun, independent of response 945 * underrun status. 946 */ 947 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 948 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 949 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 950 fsp->status_code = FC_DATA_UNDRUN; 951 fsp->io_status = 0; 952 } 953 } 954 955 seq = fsp->seq_ptr; 956 if (seq) { 957 fsp->seq_ptr = NULL; 958 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 959 struct fc_frame *conf_frame; 960 struct fc_seq *csp; 961 962 csp = lport->tt.seq_start_next(seq); 963 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 964 if (conf_frame) { 965 f_ctl = FC_FC_SEQ_INIT; 966 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 967 ep = fc_seq_exch(seq); 968 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 969 ep->did, ep->sid, 970 FC_TYPE_FCP, f_ctl, 0); 971 lport->tt.seq_send(lport, csp, conf_frame); 972 } 973 } 974 lport->tt.exch_done(seq); 975 } 976 /* 977 * Some resets driven by SCSI are not I/Os and do not have 978 * SCSI commands associated with the requests. We should not 979 * call I/O completion if we do not have a SCSI command. 980 */ 981 if (fsp->cmd) 982 fc_io_compl(fsp); 983} 984 985/** 986 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 987 * @fsp: The FCP packet whose exchanges should be canceled 988 * @error: The reason for the cancellation 989 */ 990static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 991{ 992 struct fc_lport *lport = fsp->lp; 993 994 if (fsp->seq_ptr) { 995 lport->tt.exch_done(fsp->seq_ptr); 996 fsp->seq_ptr = NULL; 997 } 998 fsp->status_code = error; 999} 1000 1001/** 1002 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1003 * @lport: The local port whose exchanges should be canceled 1004 * @id: The target's ID 1005 * @lun: The LUN 1006 * @error: The reason for cancellation 1007 * 1008 * If lun or id is -1, they are ignored. 1009 */ 1010static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1011 unsigned int lun, int error) 1012{ 1013 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1014 struct fc_fcp_pkt *fsp; 1015 struct scsi_cmnd *sc_cmd; 1016 unsigned long flags; 1017 1018 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1019restart: 1020 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1021 sc_cmd = fsp->cmd; 1022 if (id != -1 && scmd_id(sc_cmd) != id) 1023 continue; 1024 1025 if (lun != -1 && sc_cmd->device->lun != lun) 1026 continue; 1027 1028 fc_fcp_pkt_hold(fsp); 1029 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1030 1031 if (!fc_fcp_lock_pkt(fsp)) { 1032 fc_fcp_cleanup_cmd(fsp, error); 1033 fc_io_compl(fsp); 1034 fc_fcp_unlock_pkt(fsp); 1035 } 1036 1037 fc_fcp_pkt_release(fsp); 1038 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1039 /* 1040 * while we dropped the lock multiple pkts could 1041 * have been released, so we have to start over. 1042 */ 1043 goto restart; 1044 } 1045 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1046} 1047 1048/** 1049 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1050 * @lport: The local port whose exchanges are to be aborted 1051 */ 1052static void fc_fcp_abort_io(struct fc_lport *lport) 1053{ 1054 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1055} 1056 1057/** 1058 * fc_fcp_pkt_send() - Send a fcp_pkt 1059 * @lport: The local port to send the FCP packet on 1060 * @fsp: The FCP packet to send 1061 * 1062 * Return: Zero for success and -1 for failure 1063 * Locks: Called without locks held 1064 */ 1065static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1066{ 1067 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1068 unsigned long flags; 1069 int rc; 1070 1071 fsp->cmd->SCp.ptr = (char *)fsp; 1072 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1073 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1074 1075 int_to_scsilun(fsp->cmd->device->lun, 1076 (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1077 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1078 1079 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1080 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1081 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1082 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1083 if (unlikely(rc)) { 1084 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1085 list_del(&fsp->list); 1086 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1087 } 1088 1089 return rc; 1090} 1091 1092/** 1093 * get_fsp_rec_tov() - Helper function to get REC_TOV 1094 * @fsp: the FCP packet 1095 */ 1096static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 1097{ 1098 struct fc_rport *rport; 1099 struct fc_rport_libfc_priv *rpriv; 1100 1101 rport = fsp->rport; 1102 rpriv = rport->dd_data; 1103 1104 return rpriv->e_d_tov + REC_TOV_CONST; 1105} 1106 1107/** 1108 * fc_fcp_cmd_send() - Send a FCP command 1109 * @lport: The local port to send the command on 1110 * @fsp: The FCP packet the command is on 1111 * @resp: The handler for the response 1112 */ 1113static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1114 void (*resp)(struct fc_seq *, 1115 struct fc_frame *fp, 1116 void *arg)) 1117{ 1118 struct fc_frame *fp; 1119 struct fc_seq *seq; 1120 struct fc_rport *rport; 1121 struct fc_rport_libfc_priv *rpriv; 1122 const size_t len = sizeof(fsp->cdb_cmd); 1123 int rc = 0; 1124 unsigned int rec_tov; 1125 1126 if (fc_fcp_lock_pkt(fsp)) 1127 return 0; 1128 1129 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1130 if (!fp) { 1131 rc = -1; 1132 goto unlock; 1133 } 1134 1135 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1136 fr_fsp(fp) = fsp; 1137 rport = fsp->rport; 1138 fsp->max_payload = rport->maxframe_size; 1139 rpriv = rport->dd_data; 1140 1141 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1142 rpriv->local_port->port_id, FC_TYPE_FCP, 1143 FC_FCTL_REQ, 0); 1144 1145 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1146 fsp, 0); 1147 if (!seq) { 1148 rc = -1; 1149 goto unlock; 1150 } 1151 fsp->last_pkt_time = jiffies; 1152 fsp->seq_ptr = seq; 1153 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1154 1155 rec_tov = get_fsp_rec_tov(fsp); 1156 1157 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1158 1159 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1160 fc_fcp_timer_set(fsp, rec_tov); 1161 1162unlock: 1163 fc_fcp_unlock_pkt(fsp); 1164 return rc; 1165} 1166 1167/** 1168 * fc_fcp_error() - Handler for FCP layer errors 1169 * @fsp: The FCP packet the error is on 1170 * @fp: The frame that has errored 1171 */ 1172static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1173{ 1174 int error = PTR_ERR(fp); 1175 1176 if (fc_fcp_lock_pkt(fsp)) 1177 return; 1178 1179 if (error == -FC_EX_CLOSED) { 1180 fc_fcp_retry_cmd(fsp); 1181 goto unlock; 1182 } 1183 1184 /* 1185 * clear abort pending, because the lower layer 1186 * decided to force completion. 1187 */ 1188 fsp->state &= ~FC_SRB_ABORT_PENDING; 1189 fsp->status_code = FC_CMD_PLOGO; 1190 fc_fcp_complete_locked(fsp); 1191unlock: 1192 fc_fcp_unlock_pkt(fsp); 1193} 1194 1195/** 1196 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1197 * @fsp: The FCP packet to abort on 1198 * 1199 * Called to send an abort and then wait for abort completion 1200 */ 1201static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1202{ 1203 int rc = FAILED; 1204 1205 if (fc_fcp_send_abort(fsp)) 1206 return FAILED; 1207 1208 init_completion(&fsp->tm_done); 1209 fsp->wait_for_comp = 1; 1210 1211 spin_unlock_bh(&fsp->scsi_pkt_lock); 1212 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1213 spin_lock_bh(&fsp->scsi_pkt_lock); 1214 fsp->wait_for_comp = 0; 1215 1216 if (!rc) { 1217 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1218 rc = FAILED; 1219 } else if (fsp->state & FC_SRB_ABORTED) { 1220 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1221 rc = SUCCESS; 1222 fc_fcp_complete_locked(fsp); 1223 } 1224 1225 return rc; 1226} 1227 1228/** 1229 * fc_lun_reset_send() - Send LUN reset command 1230 * @data: The FCP packet that identifies the LUN to be reset 1231 */ 1232static void fc_lun_reset_send(unsigned long data) 1233{ 1234 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1235 struct fc_lport *lport = fsp->lp; 1236 unsigned int rec_tov; 1237 1238 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1239 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1240 return; 1241 if (fc_fcp_lock_pkt(fsp)) 1242 return; 1243 rec_tov = get_fsp_rec_tov(fsp); 1244 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1245 fc_fcp_timer_set(fsp, rec_tov); 1246 fc_fcp_unlock_pkt(fsp); 1247 } 1248} 1249 1250/** 1251 * fc_lun_reset() - Send a LUN RESET command to a device 1252 * and wait for the reply 1253 * @lport: The local port to sent the comand on 1254 * @fsp: The FCP packet that identifies the LUN to be reset 1255 * @id: The SCSI command ID 1256 * @lun: The LUN ID to be reset 1257 */ 1258static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1259 unsigned int id, unsigned int lun) 1260{ 1261 int rc; 1262 1263 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1264 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1265 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1266 1267 fsp->wait_for_comp = 1; 1268 init_completion(&fsp->tm_done); 1269 1270 fc_lun_reset_send((unsigned long)fsp); 1271 1272 /* 1273 * wait for completion of reset 1274 * after that make sure all commands are terminated 1275 */ 1276 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1277 1278 spin_lock_bh(&fsp->scsi_pkt_lock); 1279 fsp->state |= FC_SRB_COMPL; 1280 spin_unlock_bh(&fsp->scsi_pkt_lock); 1281 1282 del_timer_sync(&fsp->timer); 1283 1284 spin_lock_bh(&fsp->scsi_pkt_lock); 1285 if (fsp->seq_ptr) { 1286 lport->tt.exch_done(fsp->seq_ptr); 1287 fsp->seq_ptr = NULL; 1288 } 1289 fsp->wait_for_comp = 0; 1290 spin_unlock_bh(&fsp->scsi_pkt_lock); 1291 1292 if (!rc) { 1293 FC_SCSI_DBG(lport, "lun reset failed\n"); 1294 return FAILED; 1295 } 1296 1297 /* cdb_status holds the tmf's rsp code */ 1298 if (fsp->cdb_status != FCP_TMF_CMPL) 1299 return FAILED; 1300 1301 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1302 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1303 return SUCCESS; 1304} 1305 1306/** 1307 * fc_tm_done() - Task Managment response handler 1308 * @seq: The sequence that the response is on 1309 * @fp: The response frame 1310 * @arg: The FCP packet the response is for 1311 */ 1312static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1313{ 1314 struct fc_fcp_pkt *fsp = arg; 1315 struct fc_frame_header *fh; 1316 1317 if (IS_ERR(fp)) { 1318 /* 1319 * If there is an error just let it timeout or wait 1320 * for TMF to be aborted if it timedout. 1321 * 1322 * scsi-eh will escalate for when either happens. 1323 */ 1324 return; 1325 } 1326 1327 if (fc_fcp_lock_pkt(fsp)) 1328 return; 1329 1330 /* 1331 * raced with eh timeout handler. 1332 */ 1333 if (!fsp->seq_ptr || !fsp->wait_for_comp) { 1334 spin_unlock_bh(&fsp->scsi_pkt_lock); 1335 return; 1336 } 1337 1338 fh = fc_frame_header_get(fp); 1339 if (fh->fh_type != FC_TYPE_BLS) 1340 fc_fcp_resp(fsp, fp); 1341 fsp->seq_ptr = NULL; 1342 fsp->lp->tt.exch_done(seq); 1343 fc_frame_free(fp); 1344 fc_fcp_unlock_pkt(fsp); 1345} 1346 1347/** 1348 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1349 * @lport: The local port to be cleaned up 1350 */ 1351static void fc_fcp_cleanup(struct fc_lport *lport) 1352{ 1353 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1354} 1355 1356/** 1357 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1358 * @data: The FCP packet that has timed out 1359 * 1360 * If REC is supported then just issue it and return. The REC exchange will 1361 * complete or time out and recovery can continue at that point. Otherwise, 1362 * if the response has been received without all the data it has been 1363 * ER_TIMEOUT since the response was received. If the response has not been 1364 * received we see if data was received recently. If it has been then we 1365 * continue waiting, otherwise, we abort the command. 1366 */ 1367static void fc_fcp_timeout(unsigned long data) 1368{ 1369 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1370 struct fc_rport *rport = fsp->rport; 1371 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1372 1373 if (fc_fcp_lock_pkt(fsp)) 1374 return; 1375 1376 if (fsp->cdb_cmd.fc_tm_flags) 1377 goto unlock; 1378 1379 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1380 1381 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1382 fc_fcp_rec(fsp); 1383 else if (fsp->state & FC_SRB_RCV_STATUS) 1384 fc_fcp_complete_locked(fsp); 1385 else 1386 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1387 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1388unlock: 1389 fc_fcp_unlock_pkt(fsp); 1390} 1391 1392/** 1393 * fc_fcp_rec() - Send a REC ELS request 1394 * @fsp: The FCP packet to send the REC request on 1395 */ 1396static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1397{ 1398 struct fc_lport *lport; 1399 struct fc_frame *fp; 1400 struct fc_rport *rport; 1401 struct fc_rport_libfc_priv *rpriv; 1402 1403 lport = fsp->lp; 1404 rport = fsp->rport; 1405 rpriv = rport->dd_data; 1406 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1407 fsp->status_code = FC_HRD_ERROR; 1408 fsp->io_status = 0; 1409 fc_fcp_complete_locked(fsp); 1410 return; 1411 } 1412 1413 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1414 if (!fp) 1415 goto retry; 1416 1417 fr_seq(fp) = fsp->seq_ptr; 1418 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1419 rpriv->local_port->port_id, FC_TYPE_ELS, 1420 FC_FCTL_REQ, 0); 1421 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1422 fc_fcp_rec_resp, fsp, 1423 2 * lport->r_a_tov)) { 1424 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1425 return; 1426 } 1427retry: 1428 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1429 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1430 else 1431 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1432} 1433 1434/** 1435 * fc_fcp_rec_resp() - Handler for REC ELS responses 1436 * @seq: The sequence the response is on 1437 * @fp: The response frame 1438 * @arg: The FCP packet the response is on 1439 * 1440 * If the response is a reject then the scsi layer will handle 1441 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1442 * set the timeout and return. If the I/O was completed then complete the 1443 * exchange and tell the SCSI layer. 1444 */ 1445static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1446{ 1447 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1448 struct fc_els_rec_acc *recp; 1449 struct fc_els_ls_rjt *rjt; 1450 u32 e_stat; 1451 u8 opcode; 1452 u32 offset; 1453 enum dma_data_direction data_dir; 1454 enum fc_rctl r_ctl; 1455 struct fc_rport_libfc_priv *rpriv; 1456 1457 if (IS_ERR(fp)) { 1458 fc_fcp_rec_error(fsp, fp); 1459 return; 1460 } 1461 1462 if (fc_fcp_lock_pkt(fsp)) 1463 goto out; 1464 1465 fsp->recov_retry = 0; 1466 opcode = fc_frame_payload_op(fp); 1467 if (opcode == ELS_LS_RJT) { 1468 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1469 switch (rjt->er_reason) { 1470 default: 1471 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1472 "reason %d expl %d\n", 1473 fsp->rport->port_id, rjt->er_reason, 1474 rjt->er_explan); 1475 /* fall through */ 1476 case ELS_RJT_UNSUP: 1477 FC_FCP_DBG(fsp, "device does not support REC\n"); 1478 rpriv = fsp->rport->dd_data; 1479 /* 1480 * if we do not spport RECs or got some bogus 1481 * reason then resetup timer so we check for 1482 * making progress. 1483 */ 1484 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1485 break; 1486 case ELS_RJT_LOGIC: 1487 case ELS_RJT_UNAB: 1488 /* 1489 * If no data transfer, the command frame got dropped 1490 * so we just retry. If data was transferred, we 1491 * lost the response but the target has no record, 1492 * so we abort and retry. 1493 */ 1494 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1495 fsp->xfer_len == 0) { 1496 fc_fcp_retry_cmd(fsp); 1497 break; 1498 } 1499 fc_fcp_recovery(fsp, FC_ERROR); 1500 break; 1501 } 1502 } else if (opcode == ELS_LS_ACC) { 1503 if (fsp->state & FC_SRB_ABORTED) 1504 goto unlock_out; 1505 1506 data_dir = fsp->cmd->sc_data_direction; 1507 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1508 offset = ntohl(recp->reca_fc4value); 1509 e_stat = ntohl(recp->reca_e_stat); 1510 1511 if (e_stat & ESB_ST_COMPLETE) { 1512 1513 /* 1514 * The exchange is complete. 1515 * 1516 * For output, we must've lost the response. 1517 * For input, all data must've been sent. 1518 * We lost may have lost the response 1519 * (and a confirmation was requested) and maybe 1520 * some data. 1521 * 1522 * If all data received, send SRR 1523 * asking for response. If partial data received, 1524 * or gaps, SRR requests data at start of gap. 1525 * Recovery via SRR relies on in-order-delivery. 1526 */ 1527 if (data_dir == DMA_TO_DEVICE) { 1528 r_ctl = FC_RCTL_DD_CMD_STATUS; 1529 } else if (fsp->xfer_contig_end == offset) { 1530 r_ctl = FC_RCTL_DD_CMD_STATUS; 1531 } else { 1532 offset = fsp->xfer_contig_end; 1533 r_ctl = FC_RCTL_DD_SOL_DATA; 1534 } 1535 fc_fcp_srr(fsp, r_ctl, offset); 1536 } else if (e_stat & ESB_ST_SEQ_INIT) { 1537 unsigned int rec_tov = get_fsp_rec_tov(fsp); 1538 /* 1539 * The remote port has the initiative, so just 1540 * keep waiting for it to complete. 1541 */ 1542 fc_fcp_timer_set(fsp, rec_tov); 1543 } else { 1544 1545 /* 1546 * The exchange is incomplete, we have seq. initiative. 1547 * Lost response with requested confirmation, 1548 * lost confirmation, lost transfer ready or 1549 * lost write data. 1550 * 1551 * For output, if not all data was received, ask 1552 * for transfer ready to be repeated. 1553 * 1554 * If we received or sent all the data, send SRR to 1555 * request response. 1556 * 1557 * If we lost a response, we may have lost some read 1558 * data as well. 1559 */ 1560 r_ctl = FC_RCTL_DD_SOL_DATA; 1561 if (data_dir == DMA_TO_DEVICE) { 1562 r_ctl = FC_RCTL_DD_CMD_STATUS; 1563 if (offset < fsp->data_len) 1564 r_ctl = FC_RCTL_DD_DATA_DESC; 1565 } else if (offset == fsp->xfer_contig_end) { 1566 r_ctl = FC_RCTL_DD_CMD_STATUS; 1567 } else if (fsp->xfer_contig_end < offset) { 1568 offset = fsp->xfer_contig_end; 1569 } 1570 fc_fcp_srr(fsp, r_ctl, offset); 1571 } 1572 } 1573unlock_out: 1574 fc_fcp_unlock_pkt(fsp); 1575out: 1576 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1577 fc_frame_free(fp); 1578} 1579 1580/** 1581 * fc_fcp_rec_error() - Handler for REC errors 1582 * @fsp: The FCP packet the error is on 1583 * @fp: The REC frame 1584 */ 1585static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1586{ 1587 int error = PTR_ERR(fp); 1588 1589 if (fc_fcp_lock_pkt(fsp)) 1590 goto out; 1591 1592 switch (error) { 1593 case -FC_EX_CLOSED: 1594 fc_fcp_retry_cmd(fsp); 1595 break; 1596 1597 default: 1598 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1599 fsp, fsp->rport->port_id, error); 1600 fsp->status_code = FC_CMD_PLOGO; 1601 /* fall through */ 1602 1603 case -FC_EX_TIMEOUT: 1604 /* 1605 * Assume REC or LS_ACC was lost. 1606 * The exchange manager will have aborted REC, so retry. 1607 */ 1608 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", 1609 fsp->rport->port_id, error, fsp->recov_retry, 1610 FC_MAX_RECOV_RETRY); 1611 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1612 fc_fcp_rec(fsp); 1613 else 1614 fc_fcp_recovery(fsp, FC_ERROR); 1615 break; 1616 } 1617 fc_fcp_unlock_pkt(fsp); 1618out: 1619 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1620} 1621 1622/** 1623 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1624 * @fsp: The FCP pkt that needs to be aborted 1625 */ 1626static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1627{ 1628 fsp->status_code = code; 1629 fsp->cdb_status = 0; 1630 fsp->io_status = 0; 1631 /* 1632 * if this fails then we let the scsi command timer fire and 1633 * scsi-ml escalate. 1634 */ 1635 fc_fcp_send_abort(fsp); 1636} 1637 1638/** 1639 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1640 * @fsp: The FCP packet the SRR is to be sent on 1641 * @r_ctl: The R_CTL field for the SRR request 1642 * This is called after receiving status but insufficient data, or 1643 * when expecting status but the request has timed out. 1644 */ 1645static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1646{ 1647 struct fc_lport *lport = fsp->lp; 1648 struct fc_rport *rport; 1649 struct fc_rport_libfc_priv *rpriv; 1650 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1651 struct fc_seq *seq; 1652 struct fcp_srr *srr; 1653 struct fc_frame *fp; 1654 u8 cdb_op; 1655 unsigned int rec_tov; 1656 1657 rport = fsp->rport; 1658 rpriv = rport->dd_data; 1659 cdb_op = fsp->cdb_cmd.fc_cdb[0]; 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, NULL, 1682 fsp, jiffies_to_msecs(rec_tov)); 1683 if (!seq) 1684 goto retry; 1685 1686 fsp->recov_seq = seq; 1687 fsp->xfer_len = offset; 1688 fsp->xfer_contig_end = offset; 1689 fsp->state &= ~FC_SRB_RCV_STATUS; 1690 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1691 return; 1692retry: 1693 fc_fcp_retry_cmd(fsp); 1694} 1695 1696/** 1697 * fc_fcp_srr_resp() - Handler for SRR response 1698 * @seq: The sequence the SRR is on 1699 * @fp: The SRR frame 1700 * @arg: The FCP packet the SRR is on 1701 */ 1702static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1703{ 1704 struct fc_fcp_pkt *fsp = arg; 1705 struct fc_frame_header *fh; 1706 unsigned int rec_tov; 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 fsp->recov_seq = NULL; 1730 switch (fc_frame_payload_op(fp)) { 1731 case ELS_LS_ACC: 1732 fsp->recov_retry = 0; 1733 rec_tov = get_fsp_rec_tov(fsp); 1734 fc_fcp_timer_set(fsp, rec_tov); 1735 break; 1736 case ELS_LS_RJT: 1737 default: 1738 fc_fcp_recovery(fsp, FC_ERROR); 1739 break; 1740 } 1741 fc_fcp_unlock_pkt(fsp); 1742 fsp->lp->tt.exch_done(seq); 1743out: 1744 fc_frame_free(fp); 1745 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1746} 1747 1748/** 1749 * fc_fcp_srr_error() - Handler for SRR errors 1750 * @fsp: The FCP packet that the SRR error is on 1751 * @fp: The SRR frame 1752 */ 1753static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1754{ 1755 if (fc_fcp_lock_pkt(fsp)) 1756 goto out; 1757 fsp->lp->tt.exch_done(fsp->recov_seq); 1758 fsp->recov_seq = NULL; 1759 switch (PTR_ERR(fp)) { 1760 case -FC_EX_TIMEOUT: 1761 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1762 fc_fcp_rec(fsp); 1763 else 1764 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1765 break; 1766 case -FC_EX_CLOSED: /* e.g., link failure */ 1767 /* fall through */ 1768 default: 1769 fc_fcp_retry_cmd(fsp); 1770 break; 1771 } 1772 fc_fcp_unlock_pkt(fsp); 1773out: 1774 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1775} 1776 1777/** 1778 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1779 * @lport: The local port to be checked 1780 */ 1781static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1782{ 1783 /* lock ? */ 1784 return (lport->state == LPORT_ST_READY) && 1785 lport->link_up && !lport->qfull; 1786} 1787 1788/** 1789 * fc_queuecommand() - The queuecommand function of the SCSI template 1790 * @cmd: The scsi_cmnd to be executed 1791 * @done: The callback function to be called when the scsi_cmnd is complete 1792 * 1793 * This is the i/o strategy routine, called by the SCSI layer. This routine 1794 * is called with the host_lock held. 1795 */ 1796static int fc_queuecommand_lck(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) 1797{ 1798 struct fc_lport *lport; 1799 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1800 struct fc_fcp_pkt *fsp; 1801 struct fc_rport_libfc_priv *rpriv; 1802 int rval; 1803 int rc = 0; 1804 struct fcoe_dev_stats *stats; 1805 1806 lport = shost_priv(sc_cmd->device->host); 1807 1808 rval = fc_remote_port_chkready(rport); 1809 if (rval) { 1810 sc_cmd->result = rval; 1811 done(sc_cmd); 1812 return 0; 1813 } 1814 spin_unlock_irq(lport->host->host_lock); 1815 1816 if (!*(struct fc_remote_port **)rport->dd_data) { 1817 /* 1818 * rport is transitioning from blocked/deleted to 1819 * online 1820 */ 1821 sc_cmd->result = DID_IMM_RETRY << 16; 1822 done(sc_cmd); 1823 goto out; 1824 } 1825 1826 rpriv = rport->dd_data; 1827 1828 if (!fc_fcp_lport_queue_ready(lport)) { 1829 if (lport->qfull) 1830 fc_fcp_can_queue_ramp_down(lport); 1831 rc = SCSI_MLQUEUE_HOST_BUSY; 1832 goto out; 1833 } 1834 1835 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1836 if (fsp == NULL) { 1837 rc = SCSI_MLQUEUE_HOST_BUSY; 1838 goto out; 1839 } 1840 1841 /* 1842 * build the libfc request pkt 1843 */ 1844 fsp->cmd = sc_cmd; /* save the cmd */ 1845 fsp->lp = lport; /* save the softc ptr */ 1846 fsp->rport = rport; /* set the remote port ptr */ 1847 fsp->xfer_ddp = FC_XID_UNKNOWN; 1848 sc_cmd->scsi_done = done; 1849 1850 /* 1851 * set up the transfer length 1852 */ 1853 fsp->data_len = scsi_bufflen(sc_cmd); 1854 fsp->xfer_len = 0; 1855 1856 /* 1857 * setup the data direction 1858 */ 1859 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1860 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1861 fsp->req_flags = FC_SRB_READ; 1862 stats->InputRequests++; 1863 stats->InputMegabytes += fsp->data_len; 1864 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1865 fsp->req_flags = FC_SRB_WRITE; 1866 stats->OutputRequests++; 1867 stats->OutputMegabytes += fsp->data_len; 1868 } else { 1869 fsp->req_flags = 0; 1870 stats->ControlRequests++; 1871 } 1872 put_cpu(); 1873 1874 init_timer(&fsp->timer); 1875 fsp->timer.data = (unsigned long)fsp; 1876 1877 /* 1878 * send it to the lower layer 1879 * if we get -1 return then put the request in the pending 1880 * queue. 1881 */ 1882 rval = fc_fcp_pkt_send(lport, fsp); 1883 if (rval != 0) { 1884 fsp->state = FC_SRB_FREE; 1885 fc_fcp_pkt_release(fsp); 1886 rc = SCSI_MLQUEUE_HOST_BUSY; 1887 } 1888out: 1889 spin_lock_irq(lport->host->host_lock); 1890 return rc; 1891} 1892 1893DEF_SCSI_QCMD(fc_queuecommand) 1894EXPORT_SYMBOL(fc_queuecommand); 1895 1896/** 1897 * fc_io_compl() - Handle responses for completed commands 1898 * @fsp: The FCP packet that is complete 1899 * 1900 * Translates fcp_pkt errors to a Linux SCSI errors. 1901 * The fcp packet lock must be held when calling. 1902 */ 1903static void fc_io_compl(struct fc_fcp_pkt *fsp) 1904{ 1905 struct fc_fcp_internal *si; 1906 struct scsi_cmnd *sc_cmd; 1907 struct fc_lport *lport; 1908 unsigned long flags; 1909 1910 /* release outstanding ddp context */ 1911 fc_fcp_ddp_done(fsp); 1912 1913 fsp->state |= FC_SRB_COMPL; 1914 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1915 spin_unlock_bh(&fsp->scsi_pkt_lock); 1916 del_timer_sync(&fsp->timer); 1917 spin_lock_bh(&fsp->scsi_pkt_lock); 1918 } 1919 1920 lport = fsp->lp; 1921 si = fc_get_scsi_internal(lport); 1922 1923 /* 1924 * if can_queue ramp down is done then try can_queue ramp up 1925 * since commands are completing now. 1926 */ 1927 if (si->last_can_queue_ramp_down_time) 1928 fc_fcp_can_queue_ramp_up(lport); 1929 1930 sc_cmd = fsp->cmd; 1931 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1932 switch (fsp->status_code) { 1933 case FC_COMPLETE: 1934 if (fsp->cdb_status == 0) { 1935 /* 1936 * good I/O status 1937 */ 1938 sc_cmd->result = DID_OK << 16; 1939 if (fsp->scsi_resid) 1940 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1941 } else { 1942 /* 1943 * transport level I/O was ok but scsi 1944 * has non zero status 1945 */ 1946 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1947 } 1948 break; 1949 case FC_ERROR: 1950 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1951 "due to FC_ERROR\n"); 1952 sc_cmd->result = DID_ERROR << 16; 1953 break; 1954 case FC_DATA_UNDRUN: 1955 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1956 /* 1957 * scsi status is good but transport level 1958 * underrun. 1959 */ 1960 if (fsp->state & FC_SRB_RCV_STATUS) { 1961 sc_cmd->result = DID_OK << 16; 1962 } else { 1963 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 1964 " due to FC_DATA_UNDRUN (trans)\n"); 1965 sc_cmd->result = DID_ERROR << 16; 1966 } 1967 } else { 1968 /* 1969 * scsi got underrun, this is an error 1970 */ 1971 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1972 "due to FC_DATA_UNDRUN (scsi)\n"); 1973 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1974 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1975 } 1976 break; 1977 case FC_DATA_OVRRUN: 1978 /* 1979 * overrun is an error 1980 */ 1981 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1982 "due to FC_DATA_OVRRUN\n"); 1983 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1984 break; 1985 case FC_CMD_ABORTED: 1986 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1987 "due to FC_CMD_ABORTED\n"); 1988 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1989 break; 1990 case FC_CMD_RESET: 1991 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 1992 "due to FC_CMD_RESET\n"); 1993 sc_cmd->result = (DID_RESET << 16); 1994 break; 1995 case FC_HRD_ERROR: 1996 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 1997 "due to FC_HRD_ERROR\n"); 1998 sc_cmd->result = (DID_NO_CONNECT << 16); 1999 break; 2000 case FC_CRC_ERROR: 2001 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 2002 "due to FC_CRC_ERROR\n"); 2003 sc_cmd->result = (DID_PARITY << 16); 2004 break; 2005 case FC_TIMED_OUT: 2006 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 2007 "due to FC_TIMED_OUT\n"); 2008 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 2009 break; 2010 default: 2011 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2012 "due to unknown error\n"); 2013 sc_cmd->result = (DID_ERROR << 16); 2014 break; 2015 } 2016 2017 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 2018 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2019 2020 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2021 list_del(&fsp->list); 2022 sc_cmd->SCp.ptr = NULL; 2023 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2024 sc_cmd->scsi_done(sc_cmd); 2025 2026 /* release ref from initial allocation in queue command */ 2027 fc_fcp_pkt_release(fsp); 2028} 2029 2030/** 2031 * fc_eh_abort() - Abort a command 2032 * @sc_cmd: The SCSI command to abort 2033 * 2034 * From SCSI host template. 2035 * Send an ABTS to the target device and wait for the response. 2036 */ 2037int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2038{ 2039 struct fc_fcp_pkt *fsp; 2040 struct fc_lport *lport; 2041 struct fc_fcp_internal *si; 2042 int rc = FAILED; 2043 unsigned long flags; 2044 2045 lport = shost_priv(sc_cmd->device->host); 2046 if (lport->state != LPORT_ST_READY) 2047 return rc; 2048 else if (!lport->link_up) 2049 return rc; 2050 2051 si = fc_get_scsi_internal(lport); 2052 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2053 fsp = CMD_SP(sc_cmd); 2054 if (!fsp) { 2055 /* command completed while scsi eh was setting up */ 2056 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2057 return SUCCESS; 2058 } 2059 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 2060 fc_fcp_pkt_hold(fsp); 2061 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2062 2063 if (fc_fcp_lock_pkt(fsp)) { 2064 /* completed while we were waiting for timer to be deleted */ 2065 rc = SUCCESS; 2066 goto release_pkt; 2067 } 2068 2069 rc = fc_fcp_pkt_abort(fsp); 2070 fc_fcp_unlock_pkt(fsp); 2071 2072release_pkt: 2073 fc_fcp_pkt_release(fsp); 2074 return rc; 2075} 2076EXPORT_SYMBOL(fc_eh_abort); 2077 2078/** 2079 * fc_eh_device_reset() - Reset a single LUN 2080 * @sc_cmd: The SCSI command which identifies the device whose 2081 * LUN is to be reset 2082 * 2083 * Set from SCSI host template. 2084 */ 2085int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2086{ 2087 struct fc_lport *lport; 2088 struct fc_fcp_pkt *fsp; 2089 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2090 int rc = FAILED; 2091 int rval; 2092 2093 rval = fc_remote_port_chkready(rport); 2094 if (rval) 2095 goto out; 2096 2097 lport = shost_priv(sc_cmd->device->host); 2098 2099 if (lport->state != LPORT_ST_READY) 2100 return rc; 2101 2102 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2103 2104 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2105 if (fsp == NULL) { 2106 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2107 goto out; 2108 } 2109 2110 /* 2111 * Build the libfc request pkt. Do not set the scsi cmnd, because 2112 * the sc passed in is not setup for execution like when sent 2113 * through the queuecommand callout. 2114 */ 2115 fsp->lp = lport; /* save the softc ptr */ 2116 fsp->rport = rport; /* set the remote port ptr */ 2117 2118 /* 2119 * flush outstanding commands 2120 */ 2121 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2122 fsp->state = FC_SRB_FREE; 2123 fc_fcp_pkt_release(fsp); 2124 2125out: 2126 return rc; 2127} 2128EXPORT_SYMBOL(fc_eh_device_reset); 2129 2130/** 2131 * fc_eh_host_reset() - Reset a Scsi_Host. 2132 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2133 */ 2134int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2135{ 2136 struct Scsi_Host *shost = sc_cmd->device->host; 2137 struct fc_lport *lport = shost_priv(shost); 2138 unsigned long wait_tmo; 2139 2140 FC_SCSI_DBG(lport, "Resetting host\n"); 2141 2142 lport->tt.lport_reset(lport); 2143 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2144 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2145 wait_tmo)) 2146 msleep(1000); 2147 2148 if (fc_fcp_lport_queue_ready(lport)) { 2149 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2150 "on port (%6.6x)\n", lport->port_id); 2151 return SUCCESS; 2152 } else { 2153 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2154 "port (%6.6x) is not ready.\n", 2155 lport->port_id); 2156 return FAILED; 2157 } 2158} 2159EXPORT_SYMBOL(fc_eh_host_reset); 2160 2161/** 2162 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2163 * @sdev: The SCSI device that identifies the SCSI host 2164 * 2165 * Configures queue depth based on host's cmd_per_len. If not set 2166 * then we use the libfc default. 2167 */ 2168int fc_slave_alloc(struct scsi_device *sdev) 2169{ 2170 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2171 2172 if (!rport || fc_remote_port_chkready(rport)) 2173 return -ENXIO; 2174 2175 if (sdev->tagged_supported) 2176 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2177 else 2178 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2179 FC_FCP_DFLT_QUEUE_DEPTH); 2180 2181 return 0; 2182} 2183EXPORT_SYMBOL(fc_slave_alloc); 2184 2185/** 2186 * fc_change_queue_depth() - Change a device's queue depth 2187 * @sdev: The SCSI device whose queue depth is to change 2188 * @qdepth: The new queue depth 2189 * @reason: The resason for the change 2190 */ 2191int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2192{ 2193 switch (reason) { 2194 case SCSI_QDEPTH_DEFAULT: 2195 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2196 break; 2197 case SCSI_QDEPTH_QFULL: 2198 scsi_track_queue_full(sdev, qdepth); 2199 break; 2200 case SCSI_QDEPTH_RAMP_UP: 2201 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2202 break; 2203 default: 2204 return -EOPNOTSUPP; 2205 } 2206 return sdev->queue_depth; 2207} 2208EXPORT_SYMBOL(fc_change_queue_depth); 2209 2210/** 2211 * fc_change_queue_type() - Change a device's queue type 2212 * @sdev: The SCSI device whose queue depth is to change 2213 * @tag_type: Identifier for queue type 2214 */ 2215int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2216{ 2217 if (sdev->tagged_supported) { 2218 scsi_set_tag_type(sdev, tag_type); 2219 if (tag_type) 2220 scsi_activate_tcq(sdev, sdev->queue_depth); 2221 else 2222 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2223 } else 2224 tag_type = 0; 2225 2226 return tag_type; 2227} 2228EXPORT_SYMBOL(fc_change_queue_type); 2229 2230/** 2231 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2232 * @lport: The local port that no longer needs the FCP layer 2233 */ 2234void fc_fcp_destroy(struct fc_lport *lport) 2235{ 2236 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2237 2238 if (!list_empty(&si->scsi_pkt_queue)) 2239 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2240 "port (%6.6x)\n", lport->port_id); 2241 2242 mempool_destroy(si->scsi_pkt_pool); 2243 kfree(si); 2244 lport->scsi_priv = NULL; 2245} 2246EXPORT_SYMBOL(fc_fcp_destroy); 2247 2248int fc_setup_fcp() 2249{ 2250 int rc = 0; 2251 2252 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2253 sizeof(struct fc_fcp_pkt), 2254 0, SLAB_HWCACHE_ALIGN, NULL); 2255 if (!scsi_pkt_cachep) { 2256 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2257 "module load failed!"); 2258 rc = -ENOMEM; 2259 } 2260 2261 return rc; 2262} 2263 2264void fc_destroy_fcp() 2265{ 2266 if (scsi_pkt_cachep) 2267 kmem_cache_destroy(scsi_pkt_cachep); 2268} 2269 2270/** 2271 * fc_fcp_init() - Initialize the FCP layer for a local port 2272 * @lport: The local port to initialize the exchange layer for 2273 */ 2274int fc_fcp_init(struct fc_lport *lport) 2275{ 2276 int rc; 2277 struct fc_fcp_internal *si; 2278 2279 if (!lport->tt.fcp_cmd_send) 2280 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2281 2282 if (!lport->tt.fcp_cleanup) 2283 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2284 2285 if (!lport->tt.fcp_abort_io) 2286 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2287 2288 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2289 if (!si) 2290 return -ENOMEM; 2291 lport->scsi_priv = si; 2292 si->max_can_queue = lport->host->can_queue; 2293 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2294 spin_lock_init(&si->scsi_queue_lock); 2295 2296 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2297 if (!si->scsi_pkt_pool) { 2298 rc = -ENOMEM; 2299 goto free_internal; 2300 } 2301 return 0; 2302 2303free_internal: 2304 kfree(si); 2305 return rc; 2306} 2307EXPORT_SYMBOL(fc_fcp_init); 2308