fc_fcp.c revision c1ecb90a66c5afc7cc5c9349f9c3714eef4a5cfb
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 31#include <scsi/scsi_tcq.h> 32#include <scsi/scsi.h> 33#include <scsi/scsi_host.h> 34#include <scsi/scsi_device.h> 35#include <scsi/scsi_cmnd.h> 36 37#include <scsi/fc/fc_fc2.h> 38 39#include <scsi/libfc.h> 40#include <scsi/fc_encode.h> 41 42#include "fc_libfc.h" 43 44struct kmem_cache *scsi_pkt_cachep; 45 46/* SRB state definitions */ 47#define FC_SRB_FREE 0 /* cmd is free */ 48#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 49#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 50#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 51#define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */ 52#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 53#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 54#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 55 56#define FC_SRB_READ (1 << 1) 57#define FC_SRB_WRITE (1 << 0) 58 59/* 60 * The SCp.ptr should be tested and set under the host lock. NULL indicates 61 * that the command has been retruned to the scsi layer. 62 */ 63#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 64#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 65#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 66#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 67#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 68 69/** 70 * struct fc_fcp_internal - FCP layer internal data 71 * @scsi_pkt_pool: Memory pool to draw FCP packets from 72 * @scsi_queue_lock: Protects the scsi_pkt_queue 73 * @scsi_pkt_queue: Current FCP packets 74 * @last_can_queue_ramp_down_time: ramp down time 75 * @last_can_queue_ramp_up_time: ramp up time 76 * @max_can_queue: max can_queue size 77 */ 78struct fc_fcp_internal { 79 mempool_t *scsi_pkt_pool; 80 spinlock_t scsi_queue_lock; 81 struct list_head scsi_pkt_queue; 82 unsigned long last_can_queue_ramp_down_time; 83 unsigned long last_can_queue_ramp_up_time; 84 int max_can_queue; 85}; 86 87#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 88 89/* 90 * function prototypes 91 * FC scsi I/O related functions 92 */ 93static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 94static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 95static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 96static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 97static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 98static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 99static void fc_timeout_error(struct fc_fcp_pkt *); 100static void fc_fcp_timeout(unsigned long); 101static void fc_fcp_rec(struct fc_fcp_pkt *); 102static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 103static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 104static void fc_io_compl(struct fc_fcp_pkt *); 105 106static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 107static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 108static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 109 110/* 111 * command status codes 112 */ 113#define FC_COMPLETE 0 114#define FC_CMD_ABORTED 1 115#define FC_CMD_RESET 2 116#define FC_CMD_PLOGO 3 117#define FC_SNS_RCV 4 118#define FC_TRANS_ERR 5 119#define FC_DATA_OVRRUN 6 120#define FC_DATA_UNDRUN 7 121#define FC_ERROR 8 122#define FC_HRD_ERROR 9 123#define FC_CMD_TIME_OUT 10 124 125/* 126 * Error recovery timeout values. 127 */ 128#define FC_SCSI_ER_TIMEOUT (10 * HZ) 129#define FC_SCSI_TM_TOV (10 * HZ) 130#define FC_SCSI_REC_TOV (2 * HZ) 131#define FC_HOST_RESET_TIMEOUT (30 * HZ) 132#define FC_CAN_QUEUE_PERIOD (60 * HZ) 133 134#define FC_MAX_ERROR_CNT 5 135#define FC_MAX_RECOV_RETRY 3 136 137#define FC_FCP_DFLT_QUEUE_DEPTH 32 138 139/** 140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 141 * @lport: The local port that the FCP packet is for 142 * @gfp: GFP flags for allocation 143 * 144 * Return value: fcp_pkt structure or null on allocation failure. 145 * Context: Can be called from process context, no lock is required. 146 */ 147static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 148{ 149 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 150 struct fc_fcp_pkt *fsp; 151 152 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 153 if (fsp) { 154 memset(fsp, 0, sizeof(*fsp)); 155 fsp->lp = lport; 156 atomic_set(&fsp->ref_cnt, 1); 157 init_timer(&fsp->timer); 158 INIT_LIST_HEAD(&fsp->list); 159 spin_lock_init(&fsp->scsi_pkt_lock); 160 } 161 return fsp; 162} 163 164/** 165 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 166 * @fsp: The FCP packet to be released 167 * 168 * Context: Can be called from process or interrupt context, 169 * no lock is required. 170 */ 171static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 172{ 173 if (atomic_dec_and_test(&fsp->ref_cnt)) { 174 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 175 176 mempool_free(fsp, si->scsi_pkt_pool); 177 } 178} 179 180/** 181 * fc_fcp_pkt_hold() - Hold a fcp_pkt 182 * @fsp: The FCP packet to be held 183 */ 184static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 185{ 186 atomic_inc(&fsp->ref_cnt); 187} 188 189/** 190 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 191 * @seq: The sequence that the FCP packet is on (required by destructor API) 192 * @fsp: The FCP packet to be released 193 * 194 * This routine is called by a destructor callback in the exch_seq_send() 195 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 196 * argument even though it is not used by this routine. 197 * 198 * Context: No locking required. 199 */ 200static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 201{ 202 fc_fcp_pkt_release(fsp); 203} 204 205/** 206 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 207 * @fsp: The FCP packet to be locked and incremented 208 * 209 * We should only return error if we return a command to SCSI-ml before 210 * getting a response. This can happen in cases where we send a abort, but 211 * do not wait for the response and the abort and command can be passing 212 * each other on the wire/network-layer. 213 * 214 * Note: this function locks the packet and gets a reference to allow 215 * callers to call the completion function while the lock is held and 216 * not have to worry about the packets refcount. 217 * 218 * TODO: Maybe we should just have callers grab/release the lock and 219 * have a function that they call to verify the fsp and grab a ref if 220 * needed. 221 */ 222static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 223{ 224 spin_lock_bh(&fsp->scsi_pkt_lock); 225 if (fsp->state & FC_SRB_COMPL) { 226 spin_unlock_bh(&fsp->scsi_pkt_lock); 227 return -EPERM; 228 } 229 230 fc_fcp_pkt_hold(fsp); 231 return 0; 232} 233 234/** 235 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 236 * reference count 237 * @fsp: The FCP packet to be unlocked and decremented 238 */ 239static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 240{ 241 spin_unlock_bh(&fsp->scsi_pkt_lock); 242 fc_fcp_pkt_release(fsp); 243} 244 245/** 246 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 247 * @fsp: The FCP packet to start a timer for 248 * @delay: The timeout period for the timer 249 */ 250static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 251{ 252 if (!(fsp->state & FC_SRB_COMPL)) 253 mod_timer(&fsp->timer, jiffies + delay); 254} 255 256/** 257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 258 * fcp_pkt 259 * @fsp: The FCP packet to abort exchanges on 260 */ 261static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 262{ 263 if (!fsp->seq_ptr) 264 return -EINVAL; 265 266 fsp->state |= FC_SRB_ABORT_PENDING; 267 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 268} 269 270/** 271 * fc_fcp_retry_cmd() - Retry a fcp_pkt 272 * @fsp: The FCP packet to be retried 273 * 274 * Sets the status code to be FC_ERROR and then calls 275 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 276 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 277 * The SCSI-ml will retry the command. 278 */ 279static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 280{ 281 if (fsp->seq_ptr) { 282 fsp->lp->tt.exch_done(fsp->seq_ptr); 283 fsp->seq_ptr = NULL; 284 } 285 286 fsp->state &= ~FC_SRB_ABORT_PENDING; 287 fsp->io_status = 0; 288 fsp->status_code = FC_ERROR; 289 fc_fcp_complete_locked(fsp); 290} 291 292/** 293 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 294 * @fsp: The FCP packet that will manage the DDP frames 295 * @xid: The XID that will be used for the DDP exchange 296 */ 297void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 298{ 299 struct fc_lport *lport; 300 301 if (!fsp) 302 return; 303 304 lport = fsp->lp; 305 if ((fsp->req_flags & FC_SRB_READ) && 306 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 307 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 308 scsi_sg_count(fsp->cmd))) 309 fsp->xfer_ddp = xid; 310 } 311} 312 313/** 314 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 315 * DDP related resources for a fcp_pkt 316 * @fsp: The FCP packet that DDP had been used on 317 */ 318static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 319{ 320 struct fc_lport *lport; 321 322 if (!fsp) 323 return; 324 325 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 326 return; 327 328 lport = fsp->lp; 329 if (lport->tt.ddp_done) { 330 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 331 fsp->xfer_ddp = FC_XID_UNKNOWN; 332 } 333} 334 335/** 336 * fc_fcp_can_queue_ramp_up() - increases can_queue 337 * @lport: lport to ramp up can_queue 338 * 339 * Locking notes: Called with Scsi_Host lock held 340 */ 341static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 342{ 343 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 344 int can_queue; 345 346 if (si->last_can_queue_ramp_up_time && 347 (time_before(jiffies, si->last_can_queue_ramp_up_time + 348 FC_CAN_QUEUE_PERIOD))) 349 return; 350 351 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 352 FC_CAN_QUEUE_PERIOD)) 353 return; 354 355 si->last_can_queue_ramp_up_time = jiffies; 356 357 can_queue = lport->host->can_queue << 1; 358 if (can_queue >= si->max_can_queue) { 359 can_queue = si->max_can_queue; 360 si->last_can_queue_ramp_down_time = 0; 361 } 362 lport->host->can_queue = can_queue; 363 shost_printk(KERN_ERR, lport->host, "libfc: increased " 364 "can_queue to %d.\n", can_queue); 365} 366 367/** 368 * fc_fcp_can_queue_ramp_down() - reduces can_queue 369 * @lport: lport to reduce can_queue 370 * 371 * If we are getting memory allocation failures, then we may 372 * be trying to execute too many commands. We let the running 373 * commands complete or timeout, then try again with a reduced 374 * can_queue. Eventually we will hit the point where we run 375 * on all reserved structs. 376 * 377 * Locking notes: Called with Scsi_Host lock held 378 */ 379static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 380{ 381 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 382 int can_queue; 383 384 if (si->last_can_queue_ramp_down_time && 385 (time_before(jiffies, si->last_can_queue_ramp_down_time + 386 FC_CAN_QUEUE_PERIOD))) 387 return; 388 389 si->last_can_queue_ramp_down_time = jiffies; 390 391 can_queue = lport->host->can_queue; 392 can_queue >>= 1; 393 if (!can_queue) 394 can_queue = 1; 395 lport->host->can_queue = can_queue; 396 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 397 "Reducing can_queue to %d.\n", can_queue); 398} 399 400/* 401 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 402 * @lport: fc lport struct 403 * @len: payload length 404 * 405 * Allocates fc_frame structure and buffer but if fails to allocate 406 * then reduce can_queue. 407 */ 408static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 409 size_t len) 410{ 411 struct fc_frame *fp; 412 unsigned long flags; 413 414 fp = fc_frame_alloc(lport, len); 415 if (likely(fp)) 416 return fp; 417 418 /* error case */ 419 spin_lock_irqsave(lport->host->host_lock, flags); 420 fc_fcp_can_queue_ramp_down(lport); 421 spin_unlock_irqrestore(lport->host->host_lock, flags); 422 return NULL; 423} 424 425/** 426 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 427 * @fsp: The FCP packet the data is on 428 * @fp: The data frame 429 */ 430static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 431{ 432 struct scsi_cmnd *sc = fsp->cmd; 433 struct fc_lport *lport = fsp->lp; 434 struct fcoe_dev_stats *stats; 435 struct fc_frame_header *fh; 436 size_t start_offset; 437 size_t offset; 438 u32 crc; 439 u32 copy_len = 0; 440 size_t len; 441 void *buf; 442 struct scatterlist *sg; 443 u32 nents; 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 /* if this I/O is ddped, update xfer len */ 452 fc_fcp_ddp_done(fsp); 453 454 if (offset + len > fsp->data_len) { 455 /* this should never happen */ 456 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 457 fc_frame_crc_check(fp)) 458 goto crc_err; 459 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 460 "data_len %x\n", len, offset, fsp->data_len); 461 fc_fcp_retry_cmd(fsp); 462 return; 463 } 464 if (offset != fsp->xfer_len) 465 fsp->state |= FC_SRB_DISCONTIG; 466 467 sg = scsi_sglist(sc); 468 nents = scsi_sg_count(sc); 469 470 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 471 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 472 &offset, KM_SOFTIRQ0, NULL); 473 } else { 474 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 475 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 476 &offset, KM_SOFTIRQ0, &crc); 477 buf = fc_frame_payload_get(fp, 0); 478 if (len % 4) 479 crc = crc32(crc, buf + len, 4 - (len % 4)); 480 481 if (~crc != le32_to_cpu(fr_crc(fp))) { 482crc_err: 483 stats = fc_lport_get_stats(lport); 484 stats->ErrorFrames++; 485 /* FIXME - per cpu count, not total count! */ 486 if (stats->InvalidCRCCount++ < 5) 487 printk(KERN_WARNING "libfc: CRC error on data " 488 "frame for port (%6x)\n", 489 fc_host_port_id(lport->host)); 490 /* 491 * Assume the frame is total garbage. 492 * We may have copied it over the good part 493 * of the buffer. 494 * If so, we need to retry the entire operation. 495 * Otherwise, ignore it. 496 */ 497 if (fsp->state & FC_SRB_DISCONTIG) 498 fc_fcp_retry_cmd(fsp); 499 return; 500 } 501 } 502 503 if (fsp->xfer_contig_end == start_offset) 504 fsp->xfer_contig_end += copy_len; 505 fsp->xfer_len += copy_len; 506 507 /* 508 * In the very rare event that this data arrived after the response 509 * and completes the transfer, call the completion handler. 510 */ 511 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 512 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 513 fc_fcp_complete_locked(fsp); 514} 515 516/** 517 * fc_fcp_send_data() - Send SCSI data to a target 518 * @fsp: The FCP packet the data is on 519 * @sp: The sequence the data is to be sent on 520 * @offset: The starting offset for this data request 521 * @seq_blen: The burst length for this data request 522 * 523 * Called after receiving a Transfer Ready data descriptor. 524 * If the LLD is capable of sequence offload then send down the 525 * seq_blen ammount of data in single frame, otherwise send 526 * multiple frames of the maximum frame payload supported by 527 * the target port. 528 */ 529static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 530 size_t offset, size_t seq_blen) 531{ 532 struct fc_exch *ep; 533 struct scsi_cmnd *sc; 534 struct scatterlist *sg; 535 struct fc_frame *fp = NULL; 536 struct fc_lport *lport = fsp->lp; 537 struct page *page; 538 size_t remaining; 539 size_t t_blen; 540 size_t tlen; 541 size_t sg_bytes; 542 size_t frame_offset, fh_parm_offset; 543 size_t off; 544 int error; 545 void *data = NULL; 546 void *page_addr; 547 int using_sg = lport->sg_supp; 548 u32 f_ctl; 549 550 WARN_ON(seq_blen <= 0); 551 if (unlikely(offset + seq_blen > fsp->data_len)) { 552 /* this should never happen */ 553 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 554 "offset %zx\n", seq_blen, offset); 555 fc_fcp_send_abort(fsp); 556 return 0; 557 } else if (offset != fsp->xfer_len) { 558 /* Out of Order Data Request - no problem, but unexpected. */ 559 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 560 "seq_blen %zx offset %zx\n", seq_blen, offset); 561 } 562 563 /* 564 * if LLD is capable of seq_offload then set transport 565 * burst length (t_blen) to seq_blen, otherwise set t_blen 566 * to max FC frame payload previously set in fsp->max_payload. 567 */ 568 t_blen = fsp->max_payload; 569 if (lport->seq_offload) { 570 t_blen = min(seq_blen, (size_t)lport->lso_max); 571 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 572 fsp, seq_blen, lport->lso_max, t_blen); 573 } 574 575 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); 576 if (t_blen > 512) 577 t_blen &= ~(512 - 1); /* round down to block size */ 578 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ 579 sc = fsp->cmd; 580 581 remaining = seq_blen; 582 fh_parm_offset = frame_offset = offset; 583 tlen = 0; 584 seq = lport->tt.seq_start_next(seq); 585 f_ctl = FC_FC_REL_OFF; 586 WARN_ON(!seq); 587 588 sg = scsi_sglist(sc); 589 590 while (remaining > 0 && sg) { 591 if (offset >= sg->length) { 592 offset -= sg->length; 593 sg = sg_next(sg); 594 continue; 595 } 596 if (!fp) { 597 tlen = min(t_blen, remaining); 598 599 /* 600 * TODO. Temporary workaround. fc_seq_send() can't 601 * handle odd lengths in non-linear skbs. 602 * This will be the final fragment only. 603 */ 604 if (tlen % 4) 605 using_sg = 0; 606 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 607 if (!fp) 608 return -ENOMEM; 609 610 data = fc_frame_header_get(fp) + 1; 611 fh_parm_offset = frame_offset; 612 fr_max_payload(fp) = fsp->max_payload; 613 } 614 615 off = offset + sg->offset; 616 sg_bytes = min(tlen, sg->length - offset); 617 sg_bytes = min(sg_bytes, 618 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 619 page = sg_page(sg) + (off >> PAGE_SHIFT); 620 if (using_sg) { 621 get_page(page); 622 skb_fill_page_desc(fp_skb(fp), 623 skb_shinfo(fp_skb(fp))->nr_frags, 624 page, off & ~PAGE_MASK, sg_bytes); 625 fp_skb(fp)->data_len += sg_bytes; 626 fr_len(fp) += sg_bytes; 627 fp_skb(fp)->truesize += PAGE_SIZE; 628 } else { 629 /* 630 * The scatterlist item may be bigger than PAGE_SIZE, 631 * but we must not cross pages inside the kmap. 632 */ 633 page_addr = kmap_atomic(page, KM_SOFTIRQ0); 634 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 635 sg_bytes); 636 kunmap_atomic(page_addr, KM_SOFTIRQ0); 637 data += sg_bytes; 638 } 639 offset += sg_bytes; 640 frame_offset += sg_bytes; 641 tlen -= sg_bytes; 642 remaining -= sg_bytes; 643 644 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 645 (tlen)) 646 continue; 647 648 /* 649 * Send sequence with transfer sequence initiative in case 650 * this is last FCP frame of the sequence. 651 */ 652 if (remaining == 0) 653 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 654 655 ep = fc_seq_exch(seq); 656 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 657 FC_TYPE_FCP, f_ctl, fh_parm_offset); 658 659 /* 660 * send fragment using for a sequence. 661 */ 662 error = lport->tt.seq_send(lport, seq, fp); 663 if (error) { 664 WARN_ON(1); /* send error should be rare */ 665 fc_fcp_retry_cmd(fsp); 666 return 0; 667 } 668 fp = NULL; 669 } 670 fsp->xfer_len += seq_blen; /* premature count? */ 671 return 0; 672} 673 674/** 675 * fc_fcp_abts_resp() - Send an ABTS response 676 * @fsp: The FCP packet that is being aborted 677 * @fp: The response frame 678 */ 679static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 680{ 681 int ba_done = 1; 682 struct fc_ba_rjt *brp; 683 struct fc_frame_header *fh; 684 685 fh = fc_frame_header_get(fp); 686 switch (fh->fh_r_ctl) { 687 case FC_RCTL_BA_ACC: 688 break; 689 case FC_RCTL_BA_RJT: 690 brp = fc_frame_payload_get(fp, sizeof(*brp)); 691 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 692 break; 693 /* fall thru */ 694 default: 695 /* 696 * we will let the command timeout 697 * and scsi-ml recover in this case, 698 * therefore cleared the ba_done flag. 699 */ 700 ba_done = 0; 701 } 702 703 if (ba_done) { 704 fsp->state |= FC_SRB_ABORTED; 705 fsp->state &= ~FC_SRB_ABORT_PENDING; 706 707 if (fsp->wait_for_comp) 708 complete(&fsp->tm_done); 709 else 710 fc_fcp_complete_locked(fsp); 711 } 712} 713 714/** 715 * fc_fcp_recv() - Reveive an FCP frame 716 * @seq: The sequence the frame is on 717 * @fp: The received frame 718 * @arg: The related FCP packet 719 * 720 * Context: Called from Soft IRQ context. Can not be called 721 * holding the FCP packet list lock. 722 */ 723static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 724{ 725 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 726 struct fc_lport *lport = fsp->lp; 727 struct fc_frame_header *fh; 728 struct fcp_txrdy *dd; 729 u8 r_ctl; 730 int rc = 0; 731 732 if (IS_ERR(fp)) { 733 fc_fcp_error(fsp, fp); 734 return; 735 } 736 737 fh = fc_frame_header_get(fp); 738 r_ctl = fh->fh_r_ctl; 739 740 if (!(lport->state & LPORT_ST_READY)) 741 goto out; 742 if (fc_fcp_lock_pkt(fsp)) 743 goto out; 744 fsp->last_pkt_time = jiffies; 745 746 if (fh->fh_type == FC_TYPE_BLS) { 747 fc_fcp_abts_resp(fsp, fp); 748 goto unlock; 749 } 750 751 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 752 goto unlock; 753 754 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 755 /* 756 * received XFER RDY from the target 757 * need to send data to the target 758 */ 759 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 760 dd = fc_frame_payload_get(fp, sizeof(*dd)); 761 WARN_ON(!dd); 762 763 rc = fc_fcp_send_data(fsp, seq, 764 (size_t) ntohl(dd->ft_data_ro), 765 (size_t) ntohl(dd->ft_burst_len)); 766 if (!rc) 767 seq->rec_data = fsp->xfer_len; 768 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 769 /* 770 * received a DATA frame 771 * next we will copy the data to the system buffer 772 */ 773 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 774 fc_fcp_recv_data(fsp, fp); 775 seq->rec_data = fsp->xfer_contig_end; 776 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 777 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 778 779 fc_fcp_resp(fsp, fp); 780 } else { 781 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 782 } 783unlock: 784 fc_fcp_unlock_pkt(fsp); 785out: 786 fc_frame_free(fp); 787} 788 789/** 790 * fc_fcp_resp() - Handler for FCP responses 791 * @fsp: The FCP packet the response is for 792 * @fp: The response frame 793 */ 794static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 795{ 796 struct fc_frame_header *fh; 797 struct fcp_resp *fc_rp; 798 struct fcp_resp_ext *rp_ex; 799 struct fcp_resp_rsp_info *fc_rp_info; 800 u32 plen; 801 u32 expected_len; 802 u32 respl = 0; 803 u32 snsl = 0; 804 u8 flags = 0; 805 806 plen = fr_len(fp); 807 fh = (struct fc_frame_header *)fr_hdr(fp); 808 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 809 goto len_err; 810 plen -= sizeof(*fh); 811 fc_rp = (struct fcp_resp *)(fh + 1); 812 fsp->cdb_status = fc_rp->fr_status; 813 flags = fc_rp->fr_flags; 814 fsp->scsi_comp_flags = flags; 815 expected_len = fsp->data_len; 816 817 /* if ddp, update xfer len */ 818 fc_fcp_ddp_done(fsp); 819 820 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 821 rp_ex = (void *)(fc_rp + 1); 822 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 823 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 824 goto len_err; 825 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 826 if (flags & FCP_RSP_LEN_VAL) { 827 respl = ntohl(rp_ex->fr_rsp_len); 828 if (respl != sizeof(*fc_rp_info)) 829 goto len_err; 830 if (fsp->wait_for_comp) { 831 /* Abuse cdb_status for rsp code */ 832 fsp->cdb_status = fc_rp_info->rsp_code; 833 complete(&fsp->tm_done); 834 /* 835 * tmfs will not have any scsi cmd so 836 * exit here 837 */ 838 return; 839 } else 840 goto err; 841 } 842 if (flags & FCP_SNS_LEN_VAL) { 843 snsl = ntohl(rp_ex->fr_sns_len); 844 if (snsl > SCSI_SENSE_BUFFERSIZE) 845 snsl = SCSI_SENSE_BUFFERSIZE; 846 memcpy(fsp->cmd->sense_buffer, 847 (char *)fc_rp_info + respl, snsl); 848 } 849 } 850 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 851 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 852 goto len_err; 853 if (flags & FCP_RESID_UNDER) { 854 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 855 /* 856 * The cmnd->underflow is the minimum number of 857 * bytes that must be transfered for this 858 * command. Provided a sense condition is not 859 * present, make sure the actual amount 860 * transferred is at least the underflow value 861 * or fail. 862 */ 863 if (!(flags & FCP_SNS_LEN_VAL) && 864 (fc_rp->fr_status == 0) && 865 (scsi_bufflen(fsp->cmd) - 866 fsp->scsi_resid) < fsp->cmd->underflow) 867 goto err; 868 expected_len -= fsp->scsi_resid; 869 } else { 870 fsp->status_code = FC_ERROR; 871 } 872 } 873 } 874 fsp->state |= FC_SRB_RCV_STATUS; 875 876 /* 877 * Check for missing or extra data frames. 878 */ 879 if (unlikely(fsp->xfer_len != expected_len)) { 880 if (fsp->xfer_len < expected_len) { 881 /* 882 * Some data may be queued locally, 883 * Wait a at least one jiffy to see if it is delivered. 884 * If this expires without data, we may do SRR. 885 */ 886 fc_fcp_timer_set(fsp, 2); 887 return; 888 } 889 fsp->status_code = FC_DATA_OVRRUN; 890 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, " 891 "len %x, data len %x\n", 892 fsp->rport->port_id, 893 fsp->xfer_len, expected_len, fsp->data_len); 894 } 895 fc_fcp_complete_locked(fsp); 896 return; 897 898len_err: 899 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 900 "snsl %u\n", flags, fr_len(fp), respl, snsl); 901err: 902 fsp->status_code = FC_ERROR; 903 fc_fcp_complete_locked(fsp); 904} 905 906/** 907 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 908 * fcp_pkt lock held 909 * @fsp: The FCP packet to be completed 910 * 911 * This function may sleep if a timer is pending. The packet lock must be 912 * held, and the host lock must not be held. 913 */ 914static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 915{ 916 struct fc_lport *lport = fsp->lp; 917 struct fc_seq *seq; 918 struct fc_exch *ep; 919 u32 f_ctl; 920 921 if (fsp->state & FC_SRB_ABORT_PENDING) 922 return; 923 924 if (fsp->state & FC_SRB_ABORTED) { 925 if (!fsp->status_code) 926 fsp->status_code = FC_CMD_ABORTED; 927 } else { 928 /* 929 * Test for transport underrun, independent of response 930 * underrun status. 931 */ 932 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 933 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 934 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 935 fsp->status_code = FC_DATA_UNDRUN; 936 fsp->io_status = 0; 937 } 938 } 939 940 seq = fsp->seq_ptr; 941 if (seq) { 942 fsp->seq_ptr = NULL; 943 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 944 struct fc_frame *conf_frame; 945 struct fc_seq *csp; 946 947 csp = lport->tt.seq_start_next(seq); 948 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 949 if (conf_frame) { 950 f_ctl = FC_FC_SEQ_INIT; 951 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 952 ep = fc_seq_exch(seq); 953 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 954 ep->did, ep->sid, 955 FC_TYPE_FCP, f_ctl, 0); 956 lport->tt.seq_send(lport, csp, conf_frame); 957 } 958 } 959 lport->tt.exch_done(seq); 960 } 961 fc_io_compl(fsp); 962} 963 964/** 965 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 966 * @fsp: The FCP packet whose exchanges should be canceled 967 * @error: The reason for the cancellation 968 */ 969static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 970{ 971 struct fc_lport *lport = fsp->lp; 972 973 if (fsp->seq_ptr) { 974 lport->tt.exch_done(fsp->seq_ptr); 975 fsp->seq_ptr = NULL; 976 } 977 fsp->status_code = error; 978} 979 980/** 981 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 982 * @lport: The local port whose exchanges should be canceled 983 * @id: The target's ID 984 * @lun: The LUN 985 * @error: The reason for cancellation 986 * 987 * If lun or id is -1, they are ignored. 988 */ 989static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 990 unsigned int lun, int error) 991{ 992 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 993 struct fc_fcp_pkt *fsp; 994 struct scsi_cmnd *sc_cmd; 995 unsigned long flags; 996 997 spin_lock_irqsave(&si->scsi_queue_lock, flags); 998restart: 999 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1000 sc_cmd = fsp->cmd; 1001 if (id != -1 && scmd_id(sc_cmd) != id) 1002 continue; 1003 1004 if (lun != -1 && sc_cmd->device->lun != lun) 1005 continue; 1006 1007 fc_fcp_pkt_hold(fsp); 1008 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1009 1010 if (!fc_fcp_lock_pkt(fsp)) { 1011 fc_fcp_cleanup_cmd(fsp, error); 1012 fc_io_compl(fsp); 1013 fc_fcp_unlock_pkt(fsp); 1014 } 1015 1016 fc_fcp_pkt_release(fsp); 1017 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1018 /* 1019 * while we dropped the lock multiple pkts could 1020 * have been released, so we have to start over. 1021 */ 1022 goto restart; 1023 } 1024 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1025} 1026 1027/** 1028 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1029 * @lport: The local port whose exchanges are to be aborted 1030 */ 1031static void fc_fcp_abort_io(struct fc_lport *lport) 1032{ 1033 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1034} 1035 1036/** 1037 * fc_fcp_pkt_send() - Send a fcp_pkt 1038 * @lport: The local port to send the FCP packet on 1039 * @fsp: The FCP packet to send 1040 * 1041 * Return: Zero for success and -1 for failure 1042 * Locks: Called without locks held 1043 */ 1044static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1045{ 1046 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1047 unsigned long flags; 1048 int rc; 1049 1050 fsp->cmd->SCp.ptr = (char *)fsp; 1051 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1052 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1053 1054 int_to_scsilun(fsp->cmd->device->lun, 1055 (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1056 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1057 1058 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1059 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1060 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1061 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1062 if (unlikely(rc)) { 1063 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1064 list_del(&fsp->list); 1065 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1066 } 1067 1068 return rc; 1069} 1070 1071/** 1072 * fc_fcp_cmd_send() - Send a FCP command 1073 * @lport: The local port to send the command on 1074 * @fsp: The FCP packet the command is on 1075 * @resp: The handler for the response 1076 */ 1077static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1078 void (*resp)(struct fc_seq *, 1079 struct fc_frame *fp, 1080 void *arg)) 1081{ 1082 struct fc_frame *fp; 1083 struct fc_seq *seq; 1084 struct fc_rport *rport; 1085 struct fc_rport_libfc_priv *rpriv; 1086 const size_t len = sizeof(fsp->cdb_cmd); 1087 int rc = 0; 1088 1089 if (fc_fcp_lock_pkt(fsp)) 1090 return 0; 1091 1092 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1093 if (!fp) { 1094 rc = -1; 1095 goto unlock; 1096 } 1097 1098 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1099 fr_fsp(fp) = fsp; 1100 rport = fsp->rport; 1101 fsp->max_payload = rport->maxframe_size; 1102 rpriv = rport->dd_data; 1103 1104 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1105 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, 1106 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1107 1108 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1109 fsp, 0); 1110 if (!seq) { 1111 rc = -1; 1112 goto unlock; 1113 } 1114 fsp->last_pkt_time = jiffies; 1115 fsp->seq_ptr = seq; 1116 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1117 1118 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1119 fc_fcp_timer_set(fsp, 1120 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? 1121 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); 1122unlock: 1123 fc_fcp_unlock_pkt(fsp); 1124 return rc; 1125} 1126 1127/** 1128 * fc_fcp_error() - Handler for FCP layer errors 1129 * @fsp: The FCP packet the error is on 1130 * @fp: The frame that has errored 1131 */ 1132static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1133{ 1134 int error = PTR_ERR(fp); 1135 1136 if (fc_fcp_lock_pkt(fsp)) 1137 return; 1138 1139 if (error == -FC_EX_CLOSED) { 1140 fc_fcp_retry_cmd(fsp); 1141 goto unlock; 1142 } 1143 1144 /* 1145 * clear abort pending, because the lower layer 1146 * decided to force completion. 1147 */ 1148 fsp->state &= ~FC_SRB_ABORT_PENDING; 1149 fsp->status_code = FC_CMD_PLOGO; 1150 fc_fcp_complete_locked(fsp); 1151unlock: 1152 fc_fcp_unlock_pkt(fsp); 1153} 1154 1155/** 1156 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1157 * @fsp: The FCP packet to abort on 1158 * 1159 * Called to send an abort and then wait for abort completion 1160 */ 1161static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1162{ 1163 int rc = FAILED; 1164 1165 if (fc_fcp_send_abort(fsp)) 1166 return FAILED; 1167 1168 init_completion(&fsp->tm_done); 1169 fsp->wait_for_comp = 1; 1170 1171 spin_unlock_bh(&fsp->scsi_pkt_lock); 1172 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1173 spin_lock_bh(&fsp->scsi_pkt_lock); 1174 fsp->wait_for_comp = 0; 1175 1176 if (!rc) { 1177 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1178 rc = FAILED; 1179 } else if (fsp->state & FC_SRB_ABORTED) { 1180 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1181 rc = SUCCESS; 1182 fc_fcp_complete_locked(fsp); 1183 } 1184 1185 return rc; 1186} 1187 1188/** 1189 * fc_lun_reset_send() - Send LUN reset command 1190 * @data: The FCP packet that identifies the LUN to be reset 1191 */ 1192static void fc_lun_reset_send(unsigned long data) 1193{ 1194 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1195 struct fc_lport *lport = fsp->lp; 1196 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1197 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1198 return; 1199 if (fc_fcp_lock_pkt(fsp)) 1200 return; 1201 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1202 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1203 fc_fcp_unlock_pkt(fsp); 1204 } 1205} 1206 1207/** 1208 * fc_lun_reset() - Send a LUN RESET command to a device 1209 * and wait for the reply 1210 * @lport: The local port to sent the comand on 1211 * @fsp: The FCP packet that identifies the LUN to be reset 1212 * @id: The SCSI command ID 1213 * @lun: The LUN ID to be reset 1214 */ 1215static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1216 unsigned int id, unsigned int lun) 1217{ 1218 int rc; 1219 1220 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1221 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1222 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1223 1224 fsp->wait_for_comp = 1; 1225 init_completion(&fsp->tm_done); 1226 1227 fc_lun_reset_send((unsigned long)fsp); 1228 1229 /* 1230 * wait for completion of reset 1231 * after that make sure all commands are terminated 1232 */ 1233 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1234 1235 spin_lock_bh(&fsp->scsi_pkt_lock); 1236 fsp->state |= FC_SRB_COMPL; 1237 spin_unlock_bh(&fsp->scsi_pkt_lock); 1238 1239 del_timer_sync(&fsp->timer); 1240 1241 spin_lock_bh(&fsp->scsi_pkt_lock); 1242 if (fsp->seq_ptr) { 1243 lport->tt.exch_done(fsp->seq_ptr); 1244 fsp->seq_ptr = NULL; 1245 } 1246 fsp->wait_for_comp = 0; 1247 spin_unlock_bh(&fsp->scsi_pkt_lock); 1248 1249 if (!rc) { 1250 FC_SCSI_DBG(lport, "lun reset failed\n"); 1251 return FAILED; 1252 } 1253 1254 /* cdb_status holds the tmf's rsp code */ 1255 if (fsp->cdb_status != FCP_TMF_CMPL) 1256 return FAILED; 1257 1258 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1259 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1260 return SUCCESS; 1261} 1262 1263/** 1264 * fc_tm_done() - Task Managment response handler 1265 * @seq: The sequence that the response is on 1266 * @fp: The response frame 1267 * @arg: The FCP packet the response is for 1268 */ 1269static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1270{ 1271 struct fc_fcp_pkt *fsp = arg; 1272 struct fc_frame_header *fh; 1273 1274 if (IS_ERR(fp)) { 1275 /* 1276 * If there is an error just let it timeout or wait 1277 * for TMF to be aborted if it timedout. 1278 * 1279 * scsi-eh will escalate for when either happens. 1280 */ 1281 return; 1282 } 1283 1284 if (fc_fcp_lock_pkt(fsp)) 1285 return; 1286 1287 /* 1288 * raced with eh timeout handler. 1289 */ 1290 if (!fsp->seq_ptr || !fsp->wait_for_comp) { 1291 spin_unlock_bh(&fsp->scsi_pkt_lock); 1292 return; 1293 } 1294 1295 fh = fc_frame_header_get(fp); 1296 if (fh->fh_type != FC_TYPE_BLS) 1297 fc_fcp_resp(fsp, fp); 1298 fsp->seq_ptr = NULL; 1299 fsp->lp->tt.exch_done(seq); 1300 fc_frame_free(fp); 1301 fc_fcp_unlock_pkt(fsp); 1302} 1303 1304/** 1305 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1306 * @lport: The local port to be cleaned up 1307 */ 1308static void fc_fcp_cleanup(struct fc_lport *lport) 1309{ 1310 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1311} 1312 1313/** 1314 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1315 * @data: The FCP packet that has timed out 1316 * 1317 * If REC is supported then just issue it and return. The REC exchange will 1318 * complete or time out and recovery can continue at that point. Otherwise, 1319 * if the response has been received without all the data it has been 1320 * ER_TIMEOUT since the response was received. If the response has not been 1321 * received we see if data was received recently. If it has been then we 1322 * continue waiting, otherwise, we abort the command. 1323 */ 1324static void fc_fcp_timeout(unsigned long data) 1325{ 1326 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1327 struct fc_rport *rport = fsp->rport; 1328 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1329 1330 if (fc_fcp_lock_pkt(fsp)) 1331 return; 1332 1333 if (fsp->cdb_cmd.fc_tm_flags) 1334 goto unlock; 1335 1336 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1337 1338 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1339 fc_fcp_rec(fsp); 1340 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), 1341 jiffies)) 1342 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1343 else if (fsp->state & FC_SRB_RCV_STATUS) 1344 fc_fcp_complete_locked(fsp); 1345 else 1346 fc_timeout_error(fsp); 1347 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1348unlock: 1349 fc_fcp_unlock_pkt(fsp); 1350} 1351 1352/** 1353 * fc_fcp_rec() - Send a REC ELS request 1354 * @fsp: The FCP packet to send the REC request on 1355 */ 1356static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1357{ 1358 struct fc_lport *lport; 1359 struct fc_frame *fp; 1360 struct fc_rport *rport; 1361 struct fc_rport_libfc_priv *rpriv; 1362 1363 lport = fsp->lp; 1364 rport = fsp->rport; 1365 rpriv = rport->dd_data; 1366 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1367 fsp->status_code = FC_HRD_ERROR; 1368 fsp->io_status = 0; 1369 fc_fcp_complete_locked(fsp); 1370 return; 1371 } 1372 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1373 if (!fp) 1374 goto retry; 1375 1376 fr_seq(fp) = fsp->seq_ptr; 1377 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1378 fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS, 1379 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1380 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1381 fc_fcp_rec_resp, fsp, 1382 jiffies_to_msecs(FC_SCSI_REC_TOV))) { 1383 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1384 return; 1385 } 1386retry: 1387 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1388 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1389 else 1390 fc_timeout_error(fsp); 1391} 1392 1393/** 1394 * fc_fcp_rec_resp() - Handler for REC ELS responses 1395 * @seq: The sequence the response is on 1396 * @fp: The response frame 1397 * @arg: The FCP packet the response is on 1398 * 1399 * If the response is a reject then the scsi layer will handle 1400 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1401 * set the timeout and return. If the I/O was completed then complete the 1402 * exchange and tell the SCSI layer. 1403 */ 1404static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1405{ 1406 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1407 struct fc_els_rec_acc *recp; 1408 struct fc_els_ls_rjt *rjt; 1409 u32 e_stat; 1410 u8 opcode; 1411 u32 offset; 1412 enum dma_data_direction data_dir; 1413 enum fc_rctl r_ctl; 1414 struct fc_rport_libfc_priv *rpriv; 1415 1416 if (IS_ERR(fp)) { 1417 fc_fcp_rec_error(fsp, fp); 1418 return; 1419 } 1420 1421 if (fc_fcp_lock_pkt(fsp)) 1422 goto out; 1423 1424 fsp->recov_retry = 0; 1425 opcode = fc_frame_payload_op(fp); 1426 if (opcode == ELS_LS_RJT) { 1427 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1428 switch (rjt->er_reason) { 1429 default: 1430 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1431 "reason %d expl %d\n", 1432 fsp->rport->port_id, rjt->er_reason, 1433 rjt->er_explan); 1434 /* fall through */ 1435 case ELS_RJT_UNSUP: 1436 FC_FCP_DBG(fsp, "device does not support REC\n"); 1437 rpriv = fsp->rport->dd_data; 1438 /* 1439 * if we do not spport RECs or got some bogus 1440 * reason then resetup timer so we check for 1441 * making progress. 1442 */ 1443 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1444 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1445 break; 1446 case ELS_RJT_LOGIC: 1447 case ELS_RJT_UNAB: 1448 /* 1449 * If no data transfer, the command frame got dropped 1450 * so we just retry. If data was transferred, we 1451 * lost the response but the target has no record, 1452 * so we abort and retry. 1453 */ 1454 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1455 fsp->xfer_len == 0) { 1456 fc_fcp_retry_cmd(fsp); 1457 break; 1458 } 1459 fc_timeout_error(fsp); 1460 break; 1461 } 1462 } else if (opcode == ELS_LS_ACC) { 1463 if (fsp->state & FC_SRB_ABORTED) 1464 goto unlock_out; 1465 1466 data_dir = fsp->cmd->sc_data_direction; 1467 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1468 offset = ntohl(recp->reca_fc4value); 1469 e_stat = ntohl(recp->reca_e_stat); 1470 1471 if (e_stat & ESB_ST_COMPLETE) { 1472 1473 /* 1474 * The exchange is complete. 1475 * 1476 * For output, we must've lost the response. 1477 * For input, all data must've been sent. 1478 * We lost may have lost the response 1479 * (and a confirmation was requested) and maybe 1480 * some data. 1481 * 1482 * If all data received, send SRR 1483 * asking for response. If partial data received, 1484 * or gaps, SRR requests data at start of gap. 1485 * Recovery via SRR relies on in-order-delivery. 1486 */ 1487 if (data_dir == DMA_TO_DEVICE) { 1488 r_ctl = FC_RCTL_DD_CMD_STATUS; 1489 } else if (fsp->xfer_contig_end == offset) { 1490 r_ctl = FC_RCTL_DD_CMD_STATUS; 1491 } else { 1492 offset = fsp->xfer_contig_end; 1493 r_ctl = FC_RCTL_DD_SOL_DATA; 1494 } 1495 fc_fcp_srr(fsp, r_ctl, offset); 1496 } else if (e_stat & ESB_ST_SEQ_INIT) { 1497 1498 /* 1499 * The remote port has the initiative, so just 1500 * keep waiting for it to complete. 1501 */ 1502 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1503 } else { 1504 1505 /* 1506 * The exchange is incomplete, we have seq. initiative. 1507 * Lost response with requested confirmation, 1508 * lost confirmation, lost transfer ready or 1509 * lost write data. 1510 * 1511 * For output, if not all data was received, ask 1512 * for transfer ready to be repeated. 1513 * 1514 * If we received or sent all the data, send SRR to 1515 * request response. 1516 * 1517 * If we lost a response, we may have lost some read 1518 * data as well. 1519 */ 1520 r_ctl = FC_RCTL_DD_SOL_DATA; 1521 if (data_dir == DMA_TO_DEVICE) { 1522 r_ctl = FC_RCTL_DD_CMD_STATUS; 1523 if (offset < fsp->data_len) 1524 r_ctl = FC_RCTL_DD_DATA_DESC; 1525 } else if (offset == fsp->xfer_contig_end) { 1526 r_ctl = FC_RCTL_DD_CMD_STATUS; 1527 } else if (fsp->xfer_contig_end < offset) { 1528 offset = fsp->xfer_contig_end; 1529 } 1530 fc_fcp_srr(fsp, r_ctl, offset); 1531 } 1532 } 1533unlock_out: 1534 fc_fcp_unlock_pkt(fsp); 1535out: 1536 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1537 fc_frame_free(fp); 1538} 1539 1540/** 1541 * fc_fcp_rec_error() - Handler for REC errors 1542 * @fsp: The FCP packet the error is on 1543 * @fp: The REC frame 1544 */ 1545static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1546{ 1547 int error = PTR_ERR(fp); 1548 1549 if (fc_fcp_lock_pkt(fsp)) 1550 goto out; 1551 1552 switch (error) { 1553 case -FC_EX_CLOSED: 1554 fc_fcp_retry_cmd(fsp); 1555 break; 1556 1557 default: 1558 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n", 1559 fsp, fsp->rport->port_id, error); 1560 fsp->status_code = FC_CMD_PLOGO; 1561 /* fall through */ 1562 1563 case -FC_EX_TIMEOUT: 1564 /* 1565 * Assume REC or LS_ACC was lost. 1566 * The exchange manager will have aborted REC, so retry. 1567 */ 1568 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n", 1569 fsp->rport->port_id, error, fsp->recov_retry, 1570 FC_MAX_RECOV_RETRY); 1571 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1572 fc_fcp_rec(fsp); 1573 else 1574 fc_timeout_error(fsp); 1575 break; 1576 } 1577 fc_fcp_unlock_pkt(fsp); 1578out: 1579 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1580} 1581 1582/** 1583 * fc_timeout_error() - Handler for fcp_pkt timeouts 1584 * @fsp: The FCP packt that has timed out 1585 */ 1586static void fc_timeout_error(struct fc_fcp_pkt *fsp) 1587{ 1588 fsp->status_code = FC_CMD_TIME_OUT; 1589 fsp->cdb_status = 0; 1590 fsp->io_status = 0; 1591 /* 1592 * if this fails then we let the scsi command timer fire and 1593 * scsi-ml escalate. 1594 */ 1595 fc_fcp_send_abort(fsp); 1596} 1597 1598/** 1599 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1600 * @fsp: The FCP packet the SRR is to be sent on 1601 * @r_ctl: The R_CTL field for the SRR request 1602 * This is called after receiving status but insufficient data, or 1603 * when expecting status but the request has timed out. 1604 */ 1605static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1606{ 1607 struct fc_lport *lport = fsp->lp; 1608 struct fc_rport *rport; 1609 struct fc_rport_libfc_priv *rpriv; 1610 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1611 struct fc_seq *seq; 1612 struct fcp_srr *srr; 1613 struct fc_frame *fp; 1614 u8 cdb_op; 1615 1616 rport = fsp->rport; 1617 rpriv = rport->dd_data; 1618 cdb_op = fsp->cdb_cmd.fc_cdb[0]; 1619 1620 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1621 rpriv->rp_state != RPORT_ST_READY) 1622 goto retry; /* shouldn't happen */ 1623 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1624 if (!fp) 1625 goto retry; 1626 1627 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1628 memset(srr, 0, sizeof(*srr)); 1629 srr->srr_op = ELS_SRR; 1630 srr->srr_ox_id = htons(ep->oxid); 1631 srr->srr_rx_id = htons(ep->rxid); 1632 srr->srr_r_ctl = r_ctl; 1633 srr->srr_rel_off = htonl(offset); 1634 1635 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1636 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, 1637 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1638 1639 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, 1640 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); 1641 if (!seq) 1642 goto retry; 1643 1644 fsp->recov_seq = seq; 1645 fsp->xfer_len = offset; 1646 fsp->xfer_contig_end = offset; 1647 fsp->state &= ~FC_SRB_RCV_STATUS; 1648 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1649 return; 1650retry: 1651 fc_fcp_retry_cmd(fsp); 1652} 1653 1654/** 1655 * fc_fcp_srr_resp() - Handler for SRR response 1656 * @seq: The sequence the SRR is on 1657 * @fp: The SRR frame 1658 * @arg: The FCP packet the SRR is on 1659 */ 1660static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1661{ 1662 struct fc_fcp_pkt *fsp = arg; 1663 struct fc_frame_header *fh; 1664 1665 if (IS_ERR(fp)) { 1666 fc_fcp_srr_error(fsp, fp); 1667 return; 1668 } 1669 1670 if (fc_fcp_lock_pkt(fsp)) 1671 goto out; 1672 1673 fh = fc_frame_header_get(fp); 1674 /* 1675 * BUG? fc_fcp_srr_error calls exch_done which would release 1676 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1677 * then fc_exch_timeout would be sending an abort. The exch_done 1678 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1679 * an abort response though. 1680 */ 1681 if (fh->fh_type == FC_TYPE_BLS) { 1682 fc_fcp_unlock_pkt(fsp); 1683 return; 1684 } 1685 1686 fsp->recov_seq = NULL; 1687 switch (fc_frame_payload_op(fp)) { 1688 case ELS_LS_ACC: 1689 fsp->recov_retry = 0; 1690 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1691 break; 1692 case ELS_LS_RJT: 1693 default: 1694 fc_timeout_error(fsp); 1695 break; 1696 } 1697 fc_fcp_unlock_pkt(fsp); 1698 fsp->lp->tt.exch_done(seq); 1699out: 1700 fc_frame_free(fp); 1701 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1702} 1703 1704/** 1705 * fc_fcp_srr_error() - Handler for SRR errors 1706 * @fsp: The FCP packet that the SRR error is on 1707 * @fp: The SRR frame 1708 */ 1709static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1710{ 1711 if (fc_fcp_lock_pkt(fsp)) 1712 goto out; 1713 fsp->lp->tt.exch_done(fsp->recov_seq); 1714 fsp->recov_seq = NULL; 1715 switch (PTR_ERR(fp)) { 1716 case -FC_EX_TIMEOUT: 1717 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1718 fc_fcp_rec(fsp); 1719 else 1720 fc_timeout_error(fsp); 1721 break; 1722 case -FC_EX_CLOSED: /* e.g., link failure */ 1723 /* fall through */ 1724 default: 1725 fc_fcp_retry_cmd(fsp); 1726 break; 1727 } 1728 fc_fcp_unlock_pkt(fsp); 1729out: 1730 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1731} 1732 1733/** 1734 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1735 * @lport: The local port to be checked 1736 */ 1737static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1738{ 1739 /* lock ? */ 1740 return (lport->state == LPORT_ST_READY) && 1741 lport->link_up && !lport->qfull; 1742} 1743 1744/** 1745 * fc_queuecommand() - The queuecommand function of the SCSI template 1746 * @cmd: The scsi_cmnd to be executed 1747 * @done: The callback function to be called when the scsi_cmnd is complete 1748 * 1749 * This is the i/o strategy routine, called by the SCSI layer. This routine 1750 * is called with the host_lock held. 1751 */ 1752int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) 1753{ 1754 struct fc_lport *lport; 1755 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1756 struct fc_fcp_pkt *fsp; 1757 struct fc_rport_libfc_priv *rpriv; 1758 int rval; 1759 int rc = 0; 1760 struct fcoe_dev_stats *stats; 1761 1762 lport = shost_priv(sc_cmd->device->host); 1763 spin_unlock_irq(lport->host->host_lock); 1764 1765 rval = fc_remote_port_chkready(rport); 1766 if (rval) { 1767 sc_cmd->result = rval; 1768 done(sc_cmd); 1769 goto out; 1770 } 1771 1772 if (!*(struct fc_remote_port **)rport->dd_data) { 1773 /* 1774 * rport is transitioning from blocked/deleted to 1775 * online 1776 */ 1777 sc_cmd->result = DID_IMM_RETRY << 16; 1778 done(sc_cmd); 1779 goto out; 1780 } 1781 1782 rpriv = rport->dd_data; 1783 1784 if (!fc_fcp_lport_queue_ready(lport)) { 1785 if (lport->qfull) 1786 fc_fcp_can_queue_ramp_down(lport); 1787 rc = SCSI_MLQUEUE_HOST_BUSY; 1788 goto out; 1789 } 1790 1791 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1792 if (fsp == NULL) { 1793 rc = SCSI_MLQUEUE_HOST_BUSY; 1794 goto out; 1795 } 1796 1797 /* 1798 * build the libfc request pkt 1799 */ 1800 fsp->cmd = sc_cmd; /* save the cmd */ 1801 fsp->lp = lport; /* save the softc ptr */ 1802 fsp->rport = rport; /* set the remote port ptr */ 1803 fsp->xfer_ddp = FC_XID_UNKNOWN; 1804 sc_cmd->scsi_done = done; 1805 1806 /* 1807 * set up the transfer length 1808 */ 1809 fsp->data_len = scsi_bufflen(sc_cmd); 1810 fsp->xfer_len = 0; 1811 1812 /* 1813 * setup the data direction 1814 */ 1815 stats = fc_lport_get_stats(lport); 1816 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1817 fsp->req_flags = FC_SRB_READ; 1818 stats->InputRequests++; 1819 stats->InputMegabytes = fsp->data_len; 1820 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1821 fsp->req_flags = FC_SRB_WRITE; 1822 stats->OutputRequests++; 1823 stats->OutputMegabytes = fsp->data_len; 1824 } else { 1825 fsp->req_flags = 0; 1826 stats->ControlRequests++; 1827 } 1828 1829 fsp->tgt_flags = rpriv->flags; 1830 1831 init_timer(&fsp->timer); 1832 fsp->timer.data = (unsigned long)fsp; 1833 1834 /* 1835 * send it to the lower layer 1836 * if we get -1 return then put the request in the pending 1837 * queue. 1838 */ 1839 rval = fc_fcp_pkt_send(lport, fsp); 1840 if (rval != 0) { 1841 fsp->state = FC_SRB_FREE; 1842 fc_fcp_pkt_release(fsp); 1843 rc = SCSI_MLQUEUE_HOST_BUSY; 1844 } 1845out: 1846 spin_lock_irq(lport->host->host_lock); 1847 return rc; 1848} 1849EXPORT_SYMBOL(fc_queuecommand); 1850 1851/** 1852 * fc_io_compl() - Handle responses for completed commands 1853 * @fsp: The FCP packet that is complete 1854 * 1855 * Translates fcp_pkt errors to a Linux SCSI errors. 1856 * The fcp packet lock must be held when calling. 1857 */ 1858static void fc_io_compl(struct fc_fcp_pkt *fsp) 1859{ 1860 struct fc_fcp_internal *si; 1861 struct scsi_cmnd *sc_cmd; 1862 struct fc_lport *lport; 1863 unsigned long flags; 1864 1865 /* release outstanding ddp context */ 1866 fc_fcp_ddp_done(fsp); 1867 1868 fsp->state |= FC_SRB_COMPL; 1869 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1870 spin_unlock_bh(&fsp->scsi_pkt_lock); 1871 del_timer_sync(&fsp->timer); 1872 spin_lock_bh(&fsp->scsi_pkt_lock); 1873 } 1874 1875 lport = fsp->lp; 1876 si = fc_get_scsi_internal(lport); 1877 if (!fsp->cmd) 1878 return; 1879 1880 /* 1881 * if can_queue ramp down is done then try can_queue ramp up 1882 * since commands are completing now. 1883 */ 1884 if (si->last_can_queue_ramp_down_time) 1885 fc_fcp_can_queue_ramp_up(lport); 1886 1887 sc_cmd = fsp->cmd; 1888 fsp->cmd = NULL; 1889 1890 if (!sc_cmd->SCp.ptr) 1891 return; 1892 1893 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1894 switch (fsp->status_code) { 1895 case FC_COMPLETE: 1896 if (fsp->cdb_status == 0) { 1897 /* 1898 * good I/O status 1899 */ 1900 sc_cmd->result = DID_OK << 16; 1901 if (fsp->scsi_resid) 1902 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1903 } else { 1904 /* 1905 * transport level I/O was ok but scsi 1906 * has non zero status 1907 */ 1908 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1909 } 1910 break; 1911 case FC_ERROR: 1912 sc_cmd->result = DID_ERROR << 16; 1913 break; 1914 case FC_DATA_UNDRUN: 1915 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1916 /* 1917 * scsi status is good but transport level 1918 * underrun. 1919 */ 1920 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ? 1921 DID_OK : DID_ERROR) << 16; 1922 } else { 1923 /* 1924 * scsi got underrun, this is an error 1925 */ 1926 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1927 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1928 } 1929 break; 1930 case FC_DATA_OVRRUN: 1931 /* 1932 * overrun is an error 1933 */ 1934 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1935 break; 1936 case FC_CMD_ABORTED: 1937 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1938 break; 1939 case FC_CMD_TIME_OUT: 1940 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1941 break; 1942 case FC_CMD_RESET: 1943 sc_cmd->result = (DID_RESET << 16); 1944 break; 1945 case FC_HRD_ERROR: 1946 sc_cmd->result = (DID_NO_CONNECT << 16); 1947 break; 1948 default: 1949 sc_cmd->result = (DID_ERROR << 16); 1950 break; 1951 } 1952 1953 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1954 list_del(&fsp->list); 1955 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1956 sc_cmd->SCp.ptr = NULL; 1957 sc_cmd->scsi_done(sc_cmd); 1958 1959 /* release ref from initial allocation in queue command */ 1960 fc_fcp_pkt_release(fsp); 1961} 1962 1963/** 1964 * fc_eh_abort() - Abort a command 1965 * @sc_cmd: The SCSI command to abort 1966 * 1967 * From SCSI host template. 1968 * Send an ABTS to the target device and wait for the response. 1969 */ 1970int fc_eh_abort(struct scsi_cmnd *sc_cmd) 1971{ 1972 struct fc_fcp_pkt *fsp; 1973 struct fc_lport *lport; 1974 int rc = FAILED; 1975 unsigned long flags; 1976 1977 lport = shost_priv(sc_cmd->device->host); 1978 if (lport->state != LPORT_ST_READY) 1979 return rc; 1980 else if (!lport->link_up) 1981 return rc; 1982 1983 spin_lock_irqsave(lport->host->host_lock, flags); 1984 fsp = CMD_SP(sc_cmd); 1985 if (!fsp) { 1986 /* command completed while scsi eh was setting up */ 1987 spin_unlock_irqrestore(lport->host->host_lock, flags); 1988 return SUCCESS; 1989 } 1990 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 1991 fc_fcp_pkt_hold(fsp); 1992 spin_unlock_irqrestore(lport->host->host_lock, flags); 1993 1994 if (fc_fcp_lock_pkt(fsp)) { 1995 /* completed while we were waiting for timer to be deleted */ 1996 rc = SUCCESS; 1997 goto release_pkt; 1998 } 1999 2000 rc = fc_fcp_pkt_abort(fsp); 2001 fc_fcp_unlock_pkt(fsp); 2002 2003release_pkt: 2004 fc_fcp_pkt_release(fsp); 2005 return rc; 2006} 2007EXPORT_SYMBOL(fc_eh_abort); 2008 2009/** 2010 * fc_eh_device_reset() - Reset a single LUN 2011 * @sc_cmd: The SCSI command which identifies the device whose 2012 * LUN is to be reset 2013 * 2014 * Set from SCSI host template. 2015 */ 2016int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2017{ 2018 struct fc_lport *lport; 2019 struct fc_fcp_pkt *fsp; 2020 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2021 int rc = FAILED; 2022 int rval; 2023 2024 rval = fc_remote_port_chkready(rport); 2025 if (rval) 2026 goto out; 2027 2028 lport = shost_priv(sc_cmd->device->host); 2029 2030 if (lport->state != LPORT_ST_READY) 2031 return rc; 2032 2033 FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id); 2034 2035 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2036 if (fsp == NULL) { 2037 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2038 goto out; 2039 } 2040 2041 /* 2042 * Build the libfc request pkt. Do not set the scsi cmnd, because 2043 * the sc passed in is not setup for execution like when sent 2044 * through the queuecommand callout. 2045 */ 2046 fsp->lp = lport; /* save the softc ptr */ 2047 fsp->rport = rport; /* set the remote port ptr */ 2048 2049 /* 2050 * flush outstanding commands 2051 */ 2052 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2053 fsp->state = FC_SRB_FREE; 2054 fc_fcp_pkt_release(fsp); 2055 2056out: 2057 return rc; 2058} 2059EXPORT_SYMBOL(fc_eh_device_reset); 2060 2061/** 2062 * fc_eh_host_reset() - Reset a Scsi_Host. 2063 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2064 */ 2065int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2066{ 2067 struct Scsi_Host *shost = sc_cmd->device->host; 2068 struct fc_lport *lport = shost_priv(shost); 2069 unsigned long wait_tmo; 2070 2071 FC_SCSI_DBG(lport, "Resetting host\n"); 2072 2073 lport->tt.lport_reset(lport); 2074 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2075 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2076 wait_tmo)) 2077 msleep(1000); 2078 2079 if (fc_fcp_lport_queue_ready(lport)) { 2080 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2081 "on port (%6x)\n", fc_host_port_id(lport->host)); 2082 return SUCCESS; 2083 } else { 2084 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2085 "port (%6x) is not ready.\n", 2086 fc_host_port_id(lport->host)); 2087 return FAILED; 2088 } 2089} 2090EXPORT_SYMBOL(fc_eh_host_reset); 2091 2092/** 2093 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2094 * @sdev: The SCSI device that identifies the SCSI host 2095 * 2096 * Configures queue depth based on host's cmd_per_len. If not set 2097 * then we use the libfc default. 2098 */ 2099int fc_slave_alloc(struct scsi_device *sdev) 2100{ 2101 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2102 2103 if (!rport || fc_remote_port_chkready(rport)) 2104 return -ENXIO; 2105 2106 if (sdev->tagged_supported) 2107 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2108 else 2109 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2110 FC_FCP_DFLT_QUEUE_DEPTH); 2111 2112 return 0; 2113} 2114EXPORT_SYMBOL(fc_slave_alloc); 2115 2116/** 2117 * fc_change_queue_depth() - Change a device's queue depth 2118 * @sdev: The SCSI device whose queue depth is to change 2119 * @qdepth: The new queue depth 2120 * @reason: The resason for the change 2121 */ 2122int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2123{ 2124 switch (reason) { 2125 case SCSI_QDEPTH_DEFAULT: 2126 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2127 break; 2128 case SCSI_QDEPTH_QFULL: 2129 scsi_track_queue_full(sdev, qdepth); 2130 break; 2131 case SCSI_QDEPTH_RAMP_UP: 2132 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2133 break; 2134 default: 2135 return -EOPNOTSUPP; 2136 } 2137 return sdev->queue_depth; 2138} 2139EXPORT_SYMBOL(fc_change_queue_depth); 2140 2141/** 2142 * fc_change_queue_type() - Change a device's queue type 2143 * @sdev: The SCSI device whose queue depth is to change 2144 * @tag_type: Identifier for queue type 2145 */ 2146int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2147{ 2148 if (sdev->tagged_supported) { 2149 scsi_set_tag_type(sdev, tag_type); 2150 if (tag_type) 2151 scsi_activate_tcq(sdev, sdev->queue_depth); 2152 else 2153 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2154 } else 2155 tag_type = 0; 2156 2157 return tag_type; 2158} 2159EXPORT_SYMBOL(fc_change_queue_type); 2160 2161/** 2162 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2163 * @lport: The local port that no longer needs the FCP layer 2164 */ 2165void fc_fcp_destroy(struct fc_lport *lport) 2166{ 2167 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2168 2169 if (!list_empty(&si->scsi_pkt_queue)) 2170 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2171 "port (%6x)\n", fc_host_port_id(lport->host)); 2172 2173 mempool_destroy(si->scsi_pkt_pool); 2174 kfree(si); 2175 lport->scsi_priv = NULL; 2176} 2177EXPORT_SYMBOL(fc_fcp_destroy); 2178 2179int fc_setup_fcp() 2180{ 2181 int rc = 0; 2182 2183 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2184 sizeof(struct fc_fcp_pkt), 2185 0, SLAB_HWCACHE_ALIGN, NULL); 2186 if (!scsi_pkt_cachep) { 2187 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2188 "module load failed!"); 2189 rc = -ENOMEM; 2190 } 2191 2192 return rc; 2193} 2194 2195void fc_destroy_fcp() 2196{ 2197 if (scsi_pkt_cachep) 2198 kmem_cache_destroy(scsi_pkt_cachep); 2199} 2200 2201/** 2202 * fc_fcp_init() - Initialize the FCP layer for a local port 2203 * @lport: The local port to initialize the exchange layer for 2204 */ 2205int fc_fcp_init(struct fc_lport *lport) 2206{ 2207 int rc; 2208 struct fc_fcp_internal *si; 2209 2210 if (!lport->tt.fcp_cmd_send) 2211 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2212 2213 if (!lport->tt.fcp_cleanup) 2214 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2215 2216 if (!lport->tt.fcp_abort_io) 2217 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2218 2219 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2220 if (!si) 2221 return -ENOMEM; 2222 lport->scsi_priv = si; 2223 si->max_can_queue = lport->host->can_queue; 2224 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2225 spin_lock_init(&si->scsi_queue_lock); 2226 2227 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2228 if (!si->scsi_pkt_pool) { 2229 rc = -ENOMEM; 2230 goto free_internal; 2231 } 2232 return 0; 2233 2234free_internal: 2235 kfree(si); 2236 return rc; 2237} 2238EXPORT_SYMBOL(fc_fcp_init); 2239