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 45 struct kmem_cache *scsi_pkt_cachep; 46 47 /* SRB state definitions */ 48 #define FC_SRB_FREE 0 /* cmd is free */ 49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ 53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 56 57 #define FC_SRB_READ (1 << 1) 58 #define FC_SRB_WRITE (1 << 0) 59 60 /* 61 * The SCp.ptr should be tested and set under the host lock. NULL indicates 62 * that the command has been retruned to the scsi layer. 63 */ 64 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 65 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 66 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 67 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 68 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 69 70 /** 71 * struct fc_fcp_internal - FCP layer internal data 72 * @scsi_pkt_pool: Memory pool to draw FCP packets from 73 * @scsi_queue_lock: Protects the scsi_pkt_queue 74 * @scsi_pkt_queue: Current FCP packets 75 * @last_can_queue_ramp_down_time: ramp down time 76 * @last_can_queue_ramp_up_time: ramp up time 77 * @max_can_queue: max can_queue size 78 */ 79 struct fc_fcp_internal { 80 mempool_t *scsi_pkt_pool; 81 spinlock_t scsi_queue_lock; 82 struct list_head scsi_pkt_queue; 83 unsigned long last_can_queue_ramp_down_time; 84 unsigned long last_can_queue_ramp_up_time; 85 int max_can_queue; 86 }; 87 88 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 89 90 /* 91 * function prototypes 92 * FC scsi I/O related functions 93 */ 94 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 95 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 96 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 97 static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 98 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 99 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 100 static void fc_timeout_error(struct fc_fcp_pkt *); 101 static void fc_fcp_timeout(unsigned long); 102 static void fc_fcp_rec(struct fc_fcp_pkt *); 103 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 104 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 105 static void fc_io_compl(struct fc_fcp_pkt *); 106 107 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 108 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 109 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 110 111 /* 112 * command status codes 113 */ 114 #define FC_COMPLETE 0 115 #define FC_CMD_ABORTED 1 116 #define FC_CMD_RESET 2 117 #define FC_CMD_PLOGO 3 118 #define FC_SNS_RCV 4 119 #define FC_TRANS_ERR 5 120 #define FC_DATA_OVRRUN 6 121 #define FC_DATA_UNDRUN 7 122 #define FC_ERROR 8 123 #define FC_HRD_ERROR 9 124 #define FC_CMD_TIME_OUT 10 125 126 /* 127 * Error recovery timeout values. 128 */ 129 #define FC_SCSI_ER_TIMEOUT (10 * HZ) 130 #define FC_SCSI_TM_TOV (10 * HZ) 131 #define FC_SCSI_REC_TOV (2 * HZ) 132 #define FC_HOST_RESET_TIMEOUT (30 * HZ) 133 #define FC_CAN_QUEUE_PERIOD (60 * HZ) 134 135 #define FC_MAX_ERROR_CNT 5 136 #define FC_MAX_RECOV_RETRY 3 137 138 #define FC_FCP_DFLT_QUEUE_DEPTH 32 139 140 /** 141 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 142 * @lport: The local port that the FCP packet is for 143 * @gfp: GFP flags for allocation 144 * 145 * Return value: fcp_pkt structure or null on allocation failure. 146 * Context: Can be called from process context, no lock is required. 147 */ 148 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 149 { 150 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 151 struct fc_fcp_pkt *fsp; 152 153 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 154 if (fsp) { 155 memset(fsp, 0, sizeof(*fsp)); 156 fsp->lp = lport; 157 atomic_set(&fsp->ref_cnt, 1); 158 init_timer(&fsp->timer); 159 INIT_LIST_HEAD(&fsp->list); 160 spin_lock_init(&fsp->scsi_pkt_lock); 161 } 162 return fsp; 163 } 164 165 /** 166 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 167 * @fsp: The FCP packet to be released 168 * 169 * Context: Can be called from process or interrupt context, 170 * no lock is required. 171 */ 172 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 173 { 174 if (atomic_dec_and_test(&fsp->ref_cnt)) { 175 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 176 177 mempool_free(fsp, si->scsi_pkt_pool); 178 } 179 } 180 181 /** 182 * fc_fcp_pkt_hold() - Hold a fcp_pkt 183 * @fsp: The FCP packet to be held 184 */ 185 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 186 { 187 atomic_inc(&fsp->ref_cnt); 188 } 189 190 /** 191 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 192 * @seq: The sequence that the FCP packet is on (required by destructor API) 193 * @fsp: The FCP packet to be released 194 * 195 * This routine is called by a destructor callback in the exch_seq_send() 196 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 197 * argument even though it is not used by this routine. 198 * 199 * Context: No locking required. 200 */ 201 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 202 { 203 fc_fcp_pkt_release(fsp); 204 } 205 206 /** 207 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 208 * @fsp: The FCP packet to be locked and incremented 209 * 210 * We should only return error if we return a command to SCSI-ml before 211 * getting a response. This can happen in cases where we send a abort, but 212 * do not wait for the response and the abort and command can be passing 213 * each other on the wire/network-layer. 214 * 215 * Note: this function locks the packet and gets a reference to allow 216 * callers to call the completion function while the lock is held and 217 * not have to worry about the packets refcount. 218 * 219 * TODO: Maybe we should just have callers grab/release the lock and 220 * have a function that they call to verify the fsp and grab a ref if 221 * needed. 222 */ 223 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 224 { 225 spin_lock_bh(&fsp->scsi_pkt_lock); 226 if (fsp->state & FC_SRB_COMPL) { 227 spin_unlock_bh(&fsp->scsi_pkt_lock); 228 return -EPERM; 229 } 230 231 fc_fcp_pkt_hold(fsp); 232 return 0; 233 } 234 235 /** 236 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 237 * reference count 238 * @fsp: The FCP packet to be unlocked and decremented 239 */ 240 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 241 { 242 spin_unlock_bh(&fsp->scsi_pkt_lock); 243 fc_fcp_pkt_release(fsp); 244 } 245 246 /** 247 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 248 * @fsp: The FCP packet to start a timer for 249 * @delay: The timeout period for the timer 250 */ 251 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 252 { 253 if (!(fsp->state & FC_SRB_COMPL)) 254 mod_timer(&fsp->timer, jiffies + delay); 255 } 256 257 /** 258 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 259 * fcp_pkt 260 * @fsp: The FCP packet to abort exchanges on 261 */ 262 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 263 { 264 if (!fsp->seq_ptr) 265 return -EINVAL; 266 267 fsp->state |= FC_SRB_ABORT_PENDING; 268 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 269 } 270 271 /** 272 * fc_fcp_retry_cmd() - Retry a fcp_pkt 273 * @fsp: The FCP packet to be retried 274 * 275 * Sets the status code to be FC_ERROR and then calls 276 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 277 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 278 * The SCSI-ml will retry the command. 279 */ 280 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 281 { 282 if (fsp->seq_ptr) { 283 fsp->lp->tt.exch_done(fsp->seq_ptr); 284 fsp->seq_ptr = NULL; 285 } 286 287 fsp->state &= ~FC_SRB_ABORT_PENDING; 288 fsp->io_status = 0; 289 fsp->status_code = FC_ERROR; 290 fc_fcp_complete_locked(fsp); 291 } 292 293 /** 294 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 295 * @fsp: The FCP packet that will manage the DDP frames 296 * @xid: The XID that will be used for the DDP exchange 297 */ 298 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 299 { 300 struct fc_lport *lport; 301 302 lport = fsp->lp; 303 if ((fsp->req_flags & FC_SRB_READ) && 304 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 305 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 306 scsi_sg_count(fsp->cmd))) 307 fsp->xfer_ddp = xid; 308 } 309 } 310 311 /** 312 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 313 * DDP related resources for a fcp_pkt 314 * @fsp: The FCP packet that DDP had been used on 315 */ 316 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 317 { 318 struct fc_lport *lport; 319 320 if (!fsp) 321 return; 322 323 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 324 return; 325 326 lport = fsp->lp; 327 if (lport->tt.ddp_done) { 328 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 329 fsp->xfer_ddp = FC_XID_UNKNOWN; 330 } 331 } 332 333 /** 334 * fc_fcp_can_queue_ramp_up() - increases can_queue 335 * @lport: lport to ramp up can_queue 336 * 337 * Locking notes: Called with Scsi_Host lock held 338 */ 339 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 340 { 341 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 342 int can_queue; 343 344 if (si->last_can_queue_ramp_up_time && 345 (time_before(jiffies, si->last_can_queue_ramp_up_time + 346 FC_CAN_QUEUE_PERIOD))) 347 return; 348 349 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 350 FC_CAN_QUEUE_PERIOD)) 351 return; 352 353 si->last_can_queue_ramp_up_time = jiffies; 354 355 can_queue = lport->host->can_queue << 1; 356 if (can_queue >= si->max_can_queue) { 357 can_queue = si->max_can_queue; 358 si->last_can_queue_ramp_down_time = 0; 359 } 360 lport->host->can_queue = can_queue; 361 shost_printk(KERN_ERR, lport->host, "libfc: increased " 362 "can_queue to %d.\n", can_queue); 363 } 364 365 /** 366 * fc_fcp_can_queue_ramp_down() - reduces can_queue 367 * @lport: lport to reduce can_queue 368 * 369 * If we are getting memory allocation failures, then we may 370 * be trying to execute too many commands. We let the running 371 * commands complete or timeout, then try again with a reduced 372 * can_queue. Eventually we will hit the point where we run 373 * on all reserved structs. 374 * 375 * Locking notes: Called with Scsi_Host lock held 376 */ 377 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 378 { 379 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 380 int can_queue; 381 382 if (si->last_can_queue_ramp_down_time && 383 (time_before(jiffies, si->last_can_queue_ramp_down_time + 384 FC_CAN_QUEUE_PERIOD))) 385 return; 386 387 si->last_can_queue_ramp_down_time = jiffies; 388 389 can_queue = lport->host->can_queue; 390 can_queue >>= 1; 391 if (!can_queue) 392 can_queue = 1; 393 lport->host->can_queue = can_queue; 394 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 395 "Reducing can_queue to %d.\n", can_queue); 396 } 397 398 /* 399 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 400 * @lport: fc lport struct 401 * @len: payload length 402 * 403 * Allocates fc_frame structure and buffer but if fails to allocate 404 * then reduce can_queue. 405 */ 406 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 407 size_t len) 408 { 409 struct fc_frame *fp; 410 unsigned long flags; 411 412 fp = fc_frame_alloc(lport, len); 413 if (likely(fp)) 414 return fp; 415 416 /* error case */ 417 spin_lock_irqsave(lport->host->host_lock, flags); 418 fc_fcp_can_queue_ramp_down(lport); 419 spin_unlock_irqrestore(lport->host->host_lock, flags); 420 return NULL; 421 } 422 423 /** 424 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 425 * @fsp: The FCP packet the data is on 426 * @fp: The data frame 427 */ 428 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 429 { 430 struct scsi_cmnd *sc = fsp->cmd; 431 struct fc_lport *lport = fsp->lp; 432 struct fcoe_dev_stats *stats; 433 struct fc_frame_header *fh; 434 size_t start_offset; 435 size_t offset; 436 u32 crc; 437 u32 copy_len = 0; 438 size_t len; 439 void *buf; 440 struct scatterlist *sg; 441 u32 nents; 442 443 fh = fc_frame_header_get(fp); 444 offset = ntohl(fh->fh_parm_offset); 445 start_offset = offset; 446 len = fr_len(fp) - sizeof(*fh); 447 buf = fc_frame_payload_get(fp, 0); 448 449 /* if this I/O is ddped, update xfer len */ 450 fc_fcp_ddp_done(fsp); 451 452 if (offset + len > fsp->data_len) { 453 /* this should never happen */ 454 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 455 fc_frame_crc_check(fp)) 456 goto crc_err; 457 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 458 "data_len %x\n", len, offset, fsp->data_len); 459 fc_fcp_retry_cmd(fsp); 460 return; 461 } 462 if (offset != fsp->xfer_len) 463 fsp->state |= FC_SRB_DISCONTIG; 464 465 sg = scsi_sglist(sc); 466 nents = scsi_sg_count(sc); 467 468 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 469 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 470 &offset, KM_SOFTIRQ0, NULL); 471 } else { 472 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 473 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 474 &offset, KM_SOFTIRQ0, &crc); 475 buf = fc_frame_payload_get(fp, 0); 476 if (len % 4) 477 crc = crc32(crc, buf + len, 4 - (len % 4)); 478 479 if (~crc != le32_to_cpu(fr_crc(fp))) { 480 crc_err: 481 stats = fc_lport_get_stats(lport); 482 stats->ErrorFrames++; 483 /* FIXME - per cpu count, not total count! */ 484 if (stats->InvalidCRCCount++ < 5) 485 printk(KERN_WARNING "libfc: CRC error on data " 486 "frame for port (%6x)\n", 487 fc_host_port_id(lport->host)); 488 /* 489 * Assume the frame is total garbage. 490 * We may have copied it over the good part 491 * of the buffer. 492 * If so, we need to retry the entire operation. 493 * Otherwise, ignore it. 494 */ 495 if (fsp->state & FC_SRB_DISCONTIG) 496 fc_fcp_retry_cmd(fsp); 497 return; 498 } 499 } 500 501 if (fsp->xfer_contig_end == start_offset) 502 fsp->xfer_contig_end += copy_len; 503 fsp->xfer_len += copy_len; 504 505 /* 506 * In the very rare event that this data arrived after the response 507 * and completes the transfer, call the completion handler. 508 */ 509 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 510 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 511 fc_fcp_complete_locked(fsp); 512 } 513 514 /** 515 * fc_fcp_send_data() - Send SCSI data to a target 516 * @fsp: The FCP packet the data is on 517 * @sp: The sequence the data is to be sent on 518 * @offset: The starting offset for this data request 519 * @seq_blen: The burst length for this data request 520 * 521 * Called after receiving a Transfer Ready data descriptor. 522 * If the LLD is capable of sequence offload then send down the 523 * seq_blen amount of data in single frame, otherwise send 524 * multiple frames of the maximum frame payload supported by 525 * the target port. 526 */ 527 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 528 size_t offset, size_t seq_blen) 529 { 530 struct fc_exch *ep; 531 struct scsi_cmnd *sc; 532 struct scatterlist *sg; 533 struct fc_frame *fp = NULL; 534 struct fc_lport *lport = fsp->lp; 535 struct page *page; 536 size_t remaining; 537 size_t t_blen; 538 size_t tlen; 539 size_t sg_bytes; 540 size_t frame_offset, fh_parm_offset; 541 size_t off; 542 int error; 543 void *data = NULL; 544 void *page_addr; 545 int using_sg = lport->sg_supp; 546 u32 f_ctl; 547 548 WARN_ON(seq_blen <= 0); 549 if (unlikely(offset + seq_blen > fsp->data_len)) { 550 /* this should never happen */ 551 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 552 "offset %zx\n", seq_blen, offset); 553 fc_fcp_send_abort(fsp); 554 return 0; 555 } else if (offset != fsp->xfer_len) { 556 /* Out of Order Data Request - no problem, but unexpected. */ 557 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 558 "seq_blen %zx offset %zx\n", seq_blen, offset); 559 } 560 561 /* 562 * if LLD is capable of seq_offload then set transport 563 * burst length (t_blen) to seq_blen, otherwise set t_blen 564 * to max FC frame payload previously set in fsp->max_payload. 565 */ 566 t_blen = fsp->max_payload; 567 if (lport->seq_offload) { 568 t_blen = min(seq_blen, (size_t)lport->lso_max); 569 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 570 fsp, seq_blen, lport->lso_max, t_blen); 571 } 572 573 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); 574 if (t_blen > 512) 575 t_blen &= ~(512 - 1); /* round down to block size */ 576 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ 577 sc = fsp->cmd; 578 579 remaining = seq_blen; 580 fh_parm_offset = frame_offset = offset; 581 tlen = 0; 582 seq = lport->tt.seq_start_next(seq); 583 f_ctl = FC_FC_REL_OFF; 584 WARN_ON(!seq); 585 586 sg = scsi_sglist(sc); 587 588 while (remaining > 0 && sg) { 589 if (offset >= sg->length) { 590 offset -= sg->length; 591 sg = sg_next(sg); 592 continue; 593 } 594 if (!fp) { 595 tlen = min(t_blen, remaining); 596 597 /* 598 * TODO. Temporary workaround. fc_seq_send() can't 599 * handle odd lengths in non-linear skbs. 600 * This will be the final fragment only. 601 */ 602 if (tlen % 4) 603 using_sg = 0; 604 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 605 if (!fp) 606 return -ENOMEM; 607 608 data = fc_frame_header_get(fp) + 1; 609 fh_parm_offset = frame_offset; 610 fr_max_payload(fp) = fsp->max_payload; 611 } 612 613 off = offset + sg->offset; 614 sg_bytes = min(tlen, sg->length - offset); 615 sg_bytes = min(sg_bytes, 616 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 617 page = sg_page(sg) + (off >> PAGE_SHIFT); 618 if (using_sg) { 619 get_page(page); 620 skb_fill_page_desc(fp_skb(fp), 621 skb_shinfo(fp_skb(fp))->nr_frags, 622 page, off & ~PAGE_MASK, sg_bytes); 623 fp_skb(fp)->data_len += sg_bytes; 624 fr_len(fp) += sg_bytes; 625 fp_skb(fp)->truesize += PAGE_SIZE; 626 } else { 627 /* 628 * The scatterlist item may be bigger than PAGE_SIZE, 629 * but we must not cross pages inside the kmap. 630 */ 631 page_addr = kmap_atomic(page, KM_SOFTIRQ0); 632 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 633 sg_bytes); 634 kunmap_atomic(page_addr, KM_SOFTIRQ0); 635 data += sg_bytes; 636 } 637 offset += sg_bytes; 638 frame_offset += sg_bytes; 639 tlen -= sg_bytes; 640 remaining -= sg_bytes; 641 642 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 643 (tlen)) 644 continue; 645 646 /* 647 * Send sequence with transfer sequence initiative in case 648 * this is last FCP frame of the sequence. 649 */ 650 if (remaining == 0) 651 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 652 653 ep = fc_seq_exch(seq); 654 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 655 FC_TYPE_FCP, f_ctl, fh_parm_offset); 656 657 /* 658 * send fragment using for a sequence. 659 */ 660 error = lport->tt.seq_send(lport, seq, fp); 661 if (error) { 662 WARN_ON(1); /* send error should be rare */ 663 fc_fcp_retry_cmd(fsp); 664 return 0; 665 } 666 fp = NULL; 667 } 668 fsp->xfer_len += seq_blen; /* premature count? */ 669 return 0; 670 } 671 672 /** 673 * fc_fcp_abts_resp() - Send an ABTS response 674 * @fsp: The FCP packet that is being aborted 675 * @fp: The response frame 676 */ 677 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 678 { 679 int ba_done = 1; 680 struct fc_ba_rjt *brp; 681 struct fc_frame_header *fh; 682 683 fh = fc_frame_header_get(fp); 684 switch (fh->fh_r_ctl) { 685 case FC_RCTL_BA_ACC: 686 break; 687 case FC_RCTL_BA_RJT: 688 brp = fc_frame_payload_get(fp, sizeof(*brp)); 689 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 690 break; 691 /* fall thru */ 692 default: 693 /* 694 * we will let the command timeout 695 * and scsi-ml recover in this case, 696 * therefore cleared the ba_done flag. 697 */ 698 ba_done = 0; 699 } 700 701 if (ba_done) { 702 fsp->state |= FC_SRB_ABORTED; 703 fsp->state &= ~FC_SRB_ABORT_PENDING; 704 705 if (fsp->wait_for_comp) 706 complete(&fsp->tm_done); 707 else 708 fc_fcp_complete_locked(fsp); 709 } 710 } 711 712 /** 713 * fc_fcp_recv() - Reveive an FCP frame 714 * @seq: The sequence the frame is on 715 * @fp: The received frame 716 * @arg: The related FCP packet 717 * 718 * Context: Called from Soft IRQ context. Can not be called 719 * holding the FCP packet list lock. 720 */ 721 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 722 { 723 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 724 struct fc_lport *lport = fsp->lp; 725 struct fc_frame_header *fh; 726 struct fcp_txrdy *dd; 727 u8 r_ctl; 728 int rc = 0; 729 730 if (IS_ERR(fp)) { 731 fc_fcp_error(fsp, fp); 732 return; 733 } 734 735 fh = fc_frame_header_get(fp); 736 r_ctl = fh->fh_r_ctl; 737 738 if (!(lport->state & LPORT_ST_READY)) 739 goto out; 740 if (fc_fcp_lock_pkt(fsp)) 741 goto out; 742 fsp->last_pkt_time = jiffies; 743 744 if (fh->fh_type == FC_TYPE_BLS) { 745 fc_fcp_abts_resp(fsp, fp); 746 goto unlock; 747 } 748 749 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 750 goto unlock; 751 752 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 753 /* 754 * received XFER RDY from the target 755 * need to send data to the target 756 */ 757 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 758 dd = fc_frame_payload_get(fp, sizeof(*dd)); 759 WARN_ON(!dd); 760 761 rc = fc_fcp_send_data(fsp, seq, 762 (size_t) ntohl(dd->ft_data_ro), 763 (size_t) ntohl(dd->ft_burst_len)); 764 if (!rc) 765 seq->rec_data = fsp->xfer_len; 766 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 767 /* 768 * received a DATA frame 769 * next we will copy the data to the system buffer 770 */ 771 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 772 fc_fcp_recv_data(fsp, fp); 773 seq->rec_data = fsp->xfer_contig_end; 774 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 775 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 776 777 fc_fcp_resp(fsp, fp); 778 } else { 779 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 780 } 781 unlock: 782 fc_fcp_unlock_pkt(fsp); 783 out: 784 fc_frame_free(fp); 785 } 786 787 /** 788 * fc_fcp_resp() - Handler for FCP responses 789 * @fsp: The FCP packet the response is for 790 * @fp: The response frame 791 */ 792 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 793 { 794 struct fc_frame_header *fh; 795 struct fcp_resp *fc_rp; 796 struct fcp_resp_ext *rp_ex; 797 struct fcp_resp_rsp_info *fc_rp_info; 798 u32 plen; 799 u32 expected_len; 800 u32 respl = 0; 801 u32 snsl = 0; 802 u8 flags = 0; 803 804 plen = fr_len(fp); 805 fh = (struct fc_frame_header *)fr_hdr(fp); 806 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 807 goto len_err; 808 plen -= sizeof(*fh); 809 fc_rp = (struct fcp_resp *)(fh + 1); 810 fsp->cdb_status = fc_rp->fr_status; 811 flags = fc_rp->fr_flags; 812 fsp->scsi_comp_flags = flags; 813 expected_len = fsp->data_len; 814 815 /* if ddp, update xfer len */ 816 fc_fcp_ddp_done(fsp); 817 818 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 819 rp_ex = (void *)(fc_rp + 1); 820 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 821 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 822 goto len_err; 823 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 824 if (flags & FCP_RSP_LEN_VAL) { 825 respl = ntohl(rp_ex->fr_rsp_len); 826 if (respl != sizeof(*fc_rp_info)) 827 goto len_err; 828 if (fsp->wait_for_comp) { 829 /* Abuse cdb_status for rsp code */ 830 fsp->cdb_status = fc_rp_info->rsp_code; 831 complete(&fsp->tm_done); 832 /* 833 * tmfs will not have any scsi cmd so 834 * exit here 835 */ 836 return; 837 } else 838 goto err; 839 } 840 if (flags & FCP_SNS_LEN_VAL) { 841 snsl = ntohl(rp_ex->fr_sns_len); 842 if (snsl > SCSI_SENSE_BUFFERSIZE) 843 snsl = SCSI_SENSE_BUFFERSIZE; 844 memcpy(fsp->cmd->sense_buffer, 845 (char *)fc_rp_info + respl, snsl); 846 } 847 } 848 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 849 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 850 goto len_err; 851 if (flags & FCP_RESID_UNDER) { 852 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 853 /* 854 * The cmnd->underflow is the minimum number of 855 * bytes that must be transfered for this 856 * command. Provided a sense condition is not 857 * present, make sure the actual amount 858 * transferred is at least the underflow value 859 * or fail. 860 */ 861 if (!(flags & FCP_SNS_LEN_VAL) && 862 (fc_rp->fr_status == 0) && 863 (scsi_bufflen(fsp->cmd) - 864 fsp->scsi_resid) < fsp->cmd->underflow) 865 goto err; 866 expected_len -= fsp->scsi_resid; 867 } else { 868 fsp->status_code = FC_ERROR; 869 } 870 } 871 } 872 fsp->state |= FC_SRB_RCV_STATUS; 873 874 /* 875 * Check for missing or extra data frames. 876 */ 877 if (unlikely(fsp->xfer_len != expected_len)) { 878 if (fsp->xfer_len < expected_len) { 879 /* 880 * Some data may be queued locally, 881 * Wait a at least one jiffy to see if it is delivered. 882 * If this expires without data, we may do SRR. 883 */ 884 fc_fcp_timer_set(fsp, 2); 885 return; 886 } 887 fsp->status_code = FC_DATA_OVRRUN; 888 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, " 889 "len %x, data len %x\n", 890 fsp->rport->port_id, 891 fsp->xfer_len, expected_len, fsp->data_len); 892 } 893 fc_fcp_complete_locked(fsp); 894 return; 895 896 len_err: 897 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 898 "snsl %u\n", flags, fr_len(fp), respl, snsl); 899 err: 900 fsp->status_code = FC_ERROR; 901 fc_fcp_complete_locked(fsp); 902 } 903 904 /** 905 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 906 * fcp_pkt lock held 907 * @fsp: The FCP packet to be completed 908 * 909 * This function may sleep if a timer is pending. The packet lock must be 910 * held, and the host lock must not be held. 911 */ 912 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 913 { 914 struct fc_lport *lport = fsp->lp; 915 struct fc_seq *seq; 916 struct fc_exch *ep; 917 u32 f_ctl; 918 919 if (fsp->state & FC_SRB_ABORT_PENDING) 920 return; 921 922 if (fsp->state & FC_SRB_ABORTED) { 923 if (!fsp->status_code) 924 fsp->status_code = FC_CMD_ABORTED; 925 } else { 926 /* 927 * Test for transport underrun, independent of response 928 * underrun status. 929 */ 930 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 931 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 932 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 933 fsp->status_code = FC_DATA_UNDRUN; 934 fsp->io_status = 0; 935 } 936 } 937 938 seq = fsp->seq_ptr; 939 if (seq) { 940 fsp->seq_ptr = NULL; 941 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 942 struct fc_frame *conf_frame; 943 struct fc_seq *csp; 944 945 csp = lport->tt.seq_start_next(seq); 946 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 947 if (conf_frame) { 948 f_ctl = FC_FC_SEQ_INIT; 949 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 950 ep = fc_seq_exch(seq); 951 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 952 ep->did, ep->sid, 953 FC_TYPE_FCP, f_ctl, 0); 954 lport->tt.seq_send(lport, csp, conf_frame); 955 } 956 } 957 lport->tt.exch_done(seq); 958 } 959 fc_io_compl(fsp); 960 } 961 962 /** 963 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 964 * @fsp: The FCP packet whose exchanges should be canceled 965 * @error: The reason for the cancellation 966 */ 967 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 968 { 969 struct fc_lport *lport = fsp->lp; 970 971 if (fsp->seq_ptr) { 972 lport->tt.exch_done(fsp->seq_ptr); 973 fsp->seq_ptr = NULL; 974 } 975 fsp->status_code = error; 976 } 977 978 /** 979 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 980 * @lport: The local port whose exchanges should be canceled 981 * @id: The target's ID 982 * @lun: The LUN 983 * @error: The reason for cancellation 984 * 985 * If lun or id is -1, they are ignored. 986 */ 987 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 988 unsigned int lun, int error) 989 { 990 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 991 struct fc_fcp_pkt *fsp; 992 struct scsi_cmnd *sc_cmd; 993 unsigned long flags; 994 995 spin_lock_irqsave(&si->scsi_queue_lock, flags); 996 restart: 997 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 998 sc_cmd = fsp->cmd; 999 if (id != -1 && scmd_id(sc_cmd) != id) 1000 continue; 1001 1002 if (lun != -1 && sc_cmd->device->lun != lun) 1003 continue; 1004 1005 fc_fcp_pkt_hold(fsp); 1006 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1007 1008 if (!fc_fcp_lock_pkt(fsp)) { 1009 fc_fcp_cleanup_cmd(fsp, error); 1010 fc_io_compl(fsp); 1011 fc_fcp_unlock_pkt(fsp); 1012 } 1013 1014 fc_fcp_pkt_release(fsp); 1015 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1016 /* 1017 * while we dropped the lock multiple pkts could 1018 * have been released, so we have to start over. 1019 */ 1020 goto restart; 1021 } 1022 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1023 } 1024 1025 /** 1026 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1027 * @lport: The local port whose exchanges are to be aborted 1028 */ 1029 static void fc_fcp_abort_io(struct fc_lport *lport) 1030 { 1031 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1032 } 1033 1034 /** 1035 * fc_fcp_pkt_send() - Send a fcp_pkt 1036 * @lport: The local port to send the FCP packet on 1037 * @fsp: The FCP packet to send 1038 * 1039 * Return: Zero for success and -1 for failure 1040 * Locks: Called without locks held 1041 */ 1042 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1043 { 1044 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1045 unsigned long flags; 1046 int rc; 1047 1048 fsp->cmd->SCp.ptr = (char *)fsp; 1049 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1050 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1051 1052 int_to_scsilun(fsp->cmd->device->lun, 1053 (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1054 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1055 1056 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1057 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1058 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1059 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1060 if (unlikely(rc)) { 1061 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1062 list_del(&fsp->list); 1063 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1064 } 1065 1066 return rc; 1067 } 1068 1069 /** 1070 * fc_fcp_cmd_send() - Send a FCP command 1071 * @lport: The local port to send the command on 1072 * @fsp: The FCP packet the command is on 1073 * @resp: The handler for the response 1074 */ 1075 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1076 void (*resp)(struct fc_seq *, 1077 struct fc_frame *fp, 1078 void *arg)) 1079 { 1080 struct fc_frame *fp; 1081 struct fc_seq *seq; 1082 struct fc_rport *rport; 1083 struct fc_rport_libfc_priv *rpriv; 1084 const size_t len = sizeof(fsp->cdb_cmd); 1085 int rc = 0; 1086 1087 if (fc_fcp_lock_pkt(fsp)) 1088 return 0; 1089 1090 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1091 if (!fp) { 1092 rc = -1; 1093 goto unlock; 1094 } 1095 1096 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1097 fr_fsp(fp) = fsp; 1098 rport = fsp->rport; 1099 fsp->max_payload = rport->maxframe_size; 1100 rpriv = rport->dd_data; 1101 1102 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1103 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, 1104 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1105 1106 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1107 fsp, 0); 1108 if (!seq) { 1109 rc = -1; 1110 goto unlock; 1111 } 1112 fsp->last_pkt_time = jiffies; 1113 fsp->seq_ptr = seq; 1114 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1115 1116 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1117 fc_fcp_timer_set(fsp, 1118 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? 1119 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); 1120 unlock: 1121 fc_fcp_unlock_pkt(fsp); 1122 return rc; 1123 } 1124 1125 /** 1126 * fc_fcp_error() - Handler for FCP layer errors 1127 * @fsp: The FCP packet the error is on 1128 * @fp: The frame that has errored 1129 */ 1130 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1131 { 1132 int error = PTR_ERR(fp); 1133 1134 if (fc_fcp_lock_pkt(fsp)) 1135 return; 1136 1137 if (error == -FC_EX_CLOSED) { 1138 fc_fcp_retry_cmd(fsp); 1139 goto unlock; 1140 } 1141 1142 /* 1143 * clear abort pending, because the lower layer 1144 * decided to force completion. 1145 */ 1146 fsp->state &= ~FC_SRB_ABORT_PENDING; 1147 fsp->status_code = FC_CMD_PLOGO; 1148 fc_fcp_complete_locked(fsp); 1149 unlock: 1150 fc_fcp_unlock_pkt(fsp); 1151 } 1152 1153 /** 1154 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1155 * @fsp: The FCP packet to abort on 1156 * 1157 * Called to send an abort and then wait for abort completion 1158 */ 1159 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1160 { 1161 int rc = FAILED; 1162 1163 if (fc_fcp_send_abort(fsp)) 1164 return FAILED; 1165 1166 init_completion(&fsp->tm_done); 1167 fsp->wait_for_comp = 1; 1168 1169 spin_unlock_bh(&fsp->scsi_pkt_lock); 1170 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1171 spin_lock_bh(&fsp->scsi_pkt_lock); 1172 fsp->wait_for_comp = 0; 1173 1174 if (!rc) { 1175 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1176 rc = FAILED; 1177 } else if (fsp->state & FC_SRB_ABORTED) { 1178 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1179 rc = SUCCESS; 1180 fc_fcp_complete_locked(fsp); 1181 } 1182 1183 return rc; 1184 } 1185 1186 /** 1187 * fc_lun_reset_send() - Send LUN reset command 1188 * @data: The FCP packet that identifies the LUN to be reset 1189 */ 1190 static void fc_lun_reset_send(unsigned long data) 1191 { 1192 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1193 struct fc_lport *lport = fsp->lp; 1194 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1195 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1196 return; 1197 if (fc_fcp_lock_pkt(fsp)) 1198 return; 1199 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1200 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1201 fc_fcp_unlock_pkt(fsp); 1202 } 1203 } 1204 1205 /** 1206 * fc_lun_reset() - Send a LUN RESET command to a device 1207 * and wait for the reply 1208 * @lport: The local port to sent the comand on 1209 * @fsp: The FCP packet that identifies the LUN to be reset 1210 * @id: The SCSI command ID 1211 * @lun: The LUN ID to be reset 1212 */ 1213 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1214 unsigned int id, unsigned int lun) 1215 { 1216 int rc; 1217 1218 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1219 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1220 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); 1221 1222 fsp->wait_for_comp = 1; 1223 init_completion(&fsp->tm_done); 1224 1225 fc_lun_reset_send((unsigned long)fsp); 1226 1227 /* 1228 * wait for completion of reset 1229 * after that make sure all commands are terminated 1230 */ 1231 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1232 1233 spin_lock_bh(&fsp->scsi_pkt_lock); 1234 fsp->state |= FC_SRB_COMPL; 1235 spin_unlock_bh(&fsp->scsi_pkt_lock); 1236 1237 del_timer_sync(&fsp->timer); 1238 1239 spin_lock_bh(&fsp->scsi_pkt_lock); 1240 if (fsp->seq_ptr) { 1241 lport->tt.exch_done(fsp->seq_ptr); 1242 fsp->seq_ptr = NULL; 1243 } 1244 fsp->wait_for_comp = 0; 1245 spin_unlock_bh(&fsp->scsi_pkt_lock); 1246 1247 if (!rc) { 1248 FC_SCSI_DBG(lport, "lun reset failed\n"); 1249 return FAILED; 1250 } 1251 1252 /* cdb_status holds the tmf's rsp code */ 1253 if (fsp->cdb_status != FCP_TMF_CMPL) 1254 return FAILED; 1255 1256 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1257 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1258 return SUCCESS; 1259 } 1260 1261 /** 1262 * fc_tm_done() - Task Managment response handler 1263 * @seq: The sequence that the response is on 1264 * @fp: The response frame 1265 * @arg: The FCP packet the response is for 1266 */ 1267 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1268 { 1269 struct fc_fcp_pkt *fsp = arg; 1270 struct fc_frame_header *fh; 1271 1272 if (IS_ERR(fp)) { 1273 /* 1274 * If there is an error just let it timeout or wait 1275 * for TMF to be aborted if it timedout. 1276 * 1277 * scsi-eh will escalate for when either happens. 1278 */ 1279 return; 1280 } 1281 1282 if (fc_fcp_lock_pkt(fsp)) 1283 return; 1284 1285 /* 1286 * raced with eh timeout handler. 1287 */ 1288 if (!fsp->seq_ptr || !fsp->wait_for_comp) { 1289 spin_unlock_bh(&fsp->scsi_pkt_lock); 1290 return; 1291 } 1292 1293 fh = fc_frame_header_get(fp); 1294 if (fh->fh_type != FC_TYPE_BLS) 1295 fc_fcp_resp(fsp, fp); 1296 fsp->seq_ptr = NULL; 1297 fsp->lp->tt.exch_done(seq); 1298 fc_frame_free(fp); 1299 fc_fcp_unlock_pkt(fsp); 1300 } 1301 1302 /** 1303 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1304 * @lport: The local port to be cleaned up 1305 */ 1306 static void fc_fcp_cleanup(struct fc_lport *lport) 1307 { 1308 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1309 } 1310 1311 /** 1312 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1313 * @data: The FCP packet that has timed out 1314 * 1315 * If REC is supported then just issue it and return. The REC exchange will 1316 * complete or time out and recovery can continue at that point. Otherwise, 1317 * if the response has been received without all the data it has been 1318 * ER_TIMEOUT since the response was received. If the response has not been 1319 * received we see if data was received recently. If it has been then we 1320 * continue waiting, otherwise, we abort the command. 1321 */ 1322 static void fc_fcp_timeout(unsigned long data) 1323 { 1324 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1325 struct fc_rport *rport = fsp->rport; 1326 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1327 1328 if (fc_fcp_lock_pkt(fsp)) 1329 return; 1330 1331 if (fsp->cdb_cmd.fc_tm_flags) 1332 goto unlock; 1333 1334 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1335 1336 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1337 fc_fcp_rec(fsp); 1338 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), 1339 jiffies)) 1340 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1341 else if (fsp->state & FC_SRB_RCV_STATUS) 1342 fc_fcp_complete_locked(fsp); 1343 else 1344 fc_timeout_error(fsp); 1345 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1346 unlock: 1347 fc_fcp_unlock_pkt(fsp); 1348 } 1349 1350 /** 1351 * fc_fcp_rec() - Send a REC ELS request 1352 * @fsp: The FCP packet to send the REC request on 1353 */ 1354 static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1355 { 1356 struct fc_lport *lport; 1357 struct fc_frame *fp; 1358 struct fc_rport *rport; 1359 struct fc_rport_libfc_priv *rpriv; 1360 1361 lport = fsp->lp; 1362 rport = fsp->rport; 1363 rpriv = rport->dd_data; 1364 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1365 fsp->status_code = FC_HRD_ERROR; 1366 fsp->io_status = 0; 1367 fc_fcp_complete_locked(fsp); 1368 return; 1369 } 1370 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1371 if (!fp) 1372 goto retry; 1373 1374 fr_seq(fp) = fsp->seq_ptr; 1375 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1376 fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS, 1377 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1378 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1379 fc_fcp_rec_resp, fsp, 1380 jiffies_to_msecs(FC_SCSI_REC_TOV))) { 1381 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1382 return; 1383 } 1384 retry: 1385 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1386 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1387 else 1388 fc_timeout_error(fsp); 1389 } 1390 1391 /** 1392 * fc_fcp_rec_resp() - Handler for REC ELS responses 1393 * @seq: The sequence the response is on 1394 * @fp: The response frame 1395 * @arg: The FCP packet the response is on 1396 * 1397 * If the response is a reject then the scsi layer will handle 1398 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1399 * set the timeout and return. If the I/O was completed then complete the 1400 * exchange and tell the SCSI layer. 1401 */ 1402 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1403 { 1404 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1405 struct fc_els_rec_acc *recp; 1406 struct fc_els_ls_rjt *rjt; 1407 u32 e_stat; 1408 u8 opcode; 1409 u32 offset; 1410 enum dma_data_direction data_dir; 1411 enum fc_rctl r_ctl; 1412 struct fc_rport_libfc_priv *rpriv; 1413 1414 if (IS_ERR(fp)) { 1415 fc_fcp_rec_error(fsp, fp); 1416 return; 1417 } 1418 1419 if (fc_fcp_lock_pkt(fsp)) 1420 goto out; 1421 1422 fsp->recov_retry = 0; 1423 opcode = fc_frame_payload_op(fp); 1424 if (opcode == ELS_LS_RJT) { 1425 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1426 switch (rjt->er_reason) { 1427 default: 1428 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1429 "reason %d expl %d\n", 1430 fsp->rport->port_id, rjt->er_reason, 1431 rjt->er_explan); 1432 /* fall through */ 1433 case ELS_RJT_UNSUP: 1434 FC_FCP_DBG(fsp, "device does not support REC\n"); 1435 rpriv = fsp->rport->dd_data; 1436 /* 1437 * if we do not spport RECs or got some bogus 1438 * reason then resetup timer so we check for 1439 * making progress. 1440 */ 1441 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1442 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); 1443 break; 1444 case ELS_RJT_LOGIC: 1445 case ELS_RJT_UNAB: 1446 /* 1447 * If no data transfer, the command frame got dropped 1448 * so we just retry. If data was transferred, we 1449 * lost the response but the target has no record, 1450 * so we abort and retry. 1451 */ 1452 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1453 fsp->xfer_len == 0) { 1454 fc_fcp_retry_cmd(fsp); 1455 break; 1456 } 1457 fc_timeout_error(fsp); 1458 break; 1459 } 1460 } else if (opcode == ELS_LS_ACC) { 1461 if (fsp->state & FC_SRB_ABORTED) 1462 goto unlock_out; 1463 1464 data_dir = fsp->cmd->sc_data_direction; 1465 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1466 offset = ntohl(recp->reca_fc4value); 1467 e_stat = ntohl(recp->reca_e_stat); 1468 1469 if (e_stat & ESB_ST_COMPLETE) { 1470 1471 /* 1472 * The exchange is complete. 1473 * 1474 * For output, we must've lost the response. 1475 * For input, all data must've been sent. 1476 * We lost may have lost the response 1477 * (and a confirmation was requested) and maybe 1478 * some data. 1479 * 1480 * If all data received, send SRR 1481 * asking for response. If partial data received, 1482 * or gaps, SRR requests data at start of gap. 1483 * Recovery via SRR relies on in-order-delivery. 1484 */ 1485 if (data_dir == DMA_TO_DEVICE) { 1486 r_ctl = FC_RCTL_DD_CMD_STATUS; 1487 } else if (fsp->xfer_contig_end == offset) { 1488 r_ctl = FC_RCTL_DD_CMD_STATUS; 1489 } else { 1490 offset = fsp->xfer_contig_end; 1491 r_ctl = FC_RCTL_DD_SOL_DATA; 1492 } 1493 fc_fcp_srr(fsp, r_ctl, offset); 1494 } else if (e_stat & ESB_ST_SEQ_INIT) { 1495 1496 /* 1497 * The remote port has the initiative, so just 1498 * keep waiting for it to complete. 1499 */ 1500 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1501 } else { 1502 1503 /* 1504 * The exchange is incomplete, we have seq. initiative. 1505 * Lost response with requested confirmation, 1506 * lost confirmation, lost transfer ready or 1507 * lost write data. 1508 * 1509 * For output, if not all data was received, ask 1510 * for transfer ready to be repeated. 1511 * 1512 * If we received or sent all the data, send SRR to 1513 * request response. 1514 * 1515 * If we lost a response, we may have lost some read 1516 * data as well. 1517 */ 1518 r_ctl = FC_RCTL_DD_SOL_DATA; 1519 if (data_dir == DMA_TO_DEVICE) { 1520 r_ctl = FC_RCTL_DD_CMD_STATUS; 1521 if (offset < fsp->data_len) 1522 r_ctl = FC_RCTL_DD_DATA_DESC; 1523 } else if (offset == fsp->xfer_contig_end) { 1524 r_ctl = FC_RCTL_DD_CMD_STATUS; 1525 } else if (fsp->xfer_contig_end < offset) { 1526 offset = fsp->xfer_contig_end; 1527 } 1528 fc_fcp_srr(fsp, r_ctl, offset); 1529 } 1530 } 1531 unlock_out: 1532 fc_fcp_unlock_pkt(fsp); 1533 out: 1534 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1535 fc_frame_free(fp); 1536 } 1537 1538 /** 1539 * fc_fcp_rec_error() - Handler for REC errors 1540 * @fsp: The FCP packet the error is on 1541 * @fp: The REC frame 1542 */ 1543 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1544 { 1545 int error = PTR_ERR(fp); 1546 1547 if (fc_fcp_lock_pkt(fsp)) 1548 goto out; 1549 1550 switch (error) { 1551 case -FC_EX_CLOSED: 1552 fc_fcp_retry_cmd(fsp); 1553 break; 1554 1555 default: 1556 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n", 1557 fsp, fsp->rport->port_id, error); 1558 fsp->status_code = FC_CMD_PLOGO; 1559 /* fall through */ 1560 1561 case -FC_EX_TIMEOUT: 1562 /* 1563 * Assume REC or LS_ACC was lost. 1564 * The exchange manager will have aborted REC, so retry. 1565 */ 1566 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n", 1567 fsp->rport->port_id, error, fsp->recov_retry, 1568 FC_MAX_RECOV_RETRY); 1569 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1570 fc_fcp_rec(fsp); 1571 else 1572 fc_timeout_error(fsp); 1573 break; 1574 } 1575 fc_fcp_unlock_pkt(fsp); 1576 out: 1577 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1578 } 1579 1580 /** 1581 * fc_timeout_error() - Handler for fcp_pkt timeouts 1582 * @fsp: The FCP packt that has timed out 1583 */ 1584 static void fc_timeout_error(struct fc_fcp_pkt *fsp) 1585 { 1586 fsp->status_code = FC_CMD_TIME_OUT; 1587 fsp->cdb_status = 0; 1588 fsp->io_status = 0; 1589 /* 1590 * if this fails then we let the scsi command timer fire and 1591 * scsi-ml escalate. 1592 */ 1593 fc_fcp_send_abort(fsp); 1594 } 1595 1596 /** 1597 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1598 * @fsp: The FCP packet the SRR is to be sent on 1599 * @r_ctl: The R_CTL field for the SRR request 1600 * This is called after receiving status but insufficient data, or 1601 * when expecting status but the request has timed out. 1602 */ 1603 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1604 { 1605 struct fc_lport *lport = fsp->lp; 1606 struct fc_rport *rport; 1607 struct fc_rport_libfc_priv *rpriv; 1608 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1609 struct fc_seq *seq; 1610 struct fcp_srr *srr; 1611 struct fc_frame *fp; 1612 u8 cdb_op; 1613 1614 rport = fsp->rport; 1615 rpriv = rport->dd_data; 1616 cdb_op = fsp->cdb_cmd.fc_cdb[0]; 1617 1618 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1619 rpriv->rp_state != RPORT_ST_READY) 1620 goto retry; /* shouldn't happen */ 1621 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1622 if (!fp) 1623 goto retry; 1624 1625 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1626 memset(srr, 0, sizeof(*srr)); 1627 srr->srr_op = ELS_SRR; 1628 srr->srr_ox_id = htons(ep->oxid); 1629 srr->srr_rx_id = htons(ep->rxid); 1630 srr->srr_r_ctl = r_ctl; 1631 srr->srr_rel_off = htonl(offset); 1632 1633 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1634 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, 1635 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1636 1637 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, 1638 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); 1639 if (!seq) 1640 goto retry; 1641 1642 fsp->recov_seq = seq; 1643 fsp->xfer_len = offset; 1644 fsp->xfer_contig_end = offset; 1645 fsp->state &= ~FC_SRB_RCV_STATUS; 1646 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1647 return; 1648 retry: 1649 fc_fcp_retry_cmd(fsp); 1650 } 1651 1652 /** 1653 * fc_fcp_srr_resp() - Handler for SRR response 1654 * @seq: The sequence the SRR is on 1655 * @fp: The SRR frame 1656 * @arg: The FCP packet the SRR is on 1657 */ 1658 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1659 { 1660 struct fc_fcp_pkt *fsp = arg; 1661 struct fc_frame_header *fh; 1662 1663 if (IS_ERR(fp)) { 1664 fc_fcp_srr_error(fsp, fp); 1665 return; 1666 } 1667 1668 if (fc_fcp_lock_pkt(fsp)) 1669 goto out; 1670 1671 fh = fc_frame_header_get(fp); 1672 /* 1673 * BUG? fc_fcp_srr_error calls exch_done which would release 1674 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1675 * then fc_exch_timeout would be sending an abort. The exch_done 1676 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1677 * an abort response though. 1678 */ 1679 if (fh->fh_type == FC_TYPE_BLS) { 1680 fc_fcp_unlock_pkt(fsp); 1681 return; 1682 } 1683 1684 fsp->recov_seq = NULL; 1685 switch (fc_frame_payload_op(fp)) { 1686 case ELS_LS_ACC: 1687 fsp->recov_retry = 0; 1688 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); 1689 break; 1690 case ELS_LS_RJT: 1691 default: 1692 fc_timeout_error(fsp); 1693 break; 1694 } 1695 fc_fcp_unlock_pkt(fsp); 1696 fsp->lp->tt.exch_done(seq); 1697 out: 1698 fc_frame_free(fp); 1699 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1700 } 1701 1702 /** 1703 * fc_fcp_srr_error() - Handler for SRR errors 1704 * @fsp: The FCP packet that the SRR error is on 1705 * @fp: The SRR frame 1706 */ 1707 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1708 { 1709 if (fc_fcp_lock_pkt(fsp)) 1710 goto out; 1711 fsp->lp->tt.exch_done(fsp->recov_seq); 1712 fsp->recov_seq = NULL; 1713 switch (PTR_ERR(fp)) { 1714 case -FC_EX_TIMEOUT: 1715 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1716 fc_fcp_rec(fsp); 1717 else 1718 fc_timeout_error(fsp); 1719 break; 1720 case -FC_EX_CLOSED: /* e.g., link failure */ 1721 /* fall through */ 1722 default: 1723 fc_fcp_retry_cmd(fsp); 1724 break; 1725 } 1726 fc_fcp_unlock_pkt(fsp); 1727 out: 1728 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ 1729 } 1730 1731 /** 1732 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1733 * @lport: The local port to be checked 1734 */ 1735 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1736 { 1737 /* lock ? */ 1738 return (lport->state == LPORT_ST_READY) && 1739 lport->link_up && !lport->qfull; 1740 } 1741 1742 /** 1743 * fc_queuecommand() - The queuecommand function of the SCSI template 1744 * @cmd: The scsi_cmnd to be executed 1745 * @done: The callback function to be called when the scsi_cmnd is complete 1746 * 1747 * This is the i/o strategy routine, called by the SCSI layer. This routine 1748 * is called with the host_lock held. 1749 */ 1750 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) 1751 { 1752 struct fc_lport *lport; 1753 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1754 struct fc_fcp_pkt *fsp; 1755 struct fc_rport_libfc_priv *rpriv; 1756 int rval; 1757 int rc = 0; 1758 struct fcoe_dev_stats *stats; 1759 1760 lport = shost_priv(sc_cmd->device->host); 1761 spin_unlock_irq(lport->host->host_lock); 1762 1763 rval = fc_remote_port_chkready(rport); 1764 if (rval) { 1765 sc_cmd->result = rval; 1766 done(sc_cmd); 1767 goto out; 1768 } 1769 1770 if (!*(struct fc_remote_port **)rport->dd_data) { 1771 /* 1772 * rport is transitioning from blocked/deleted to 1773 * online 1774 */ 1775 sc_cmd->result = DID_IMM_RETRY << 16; 1776 done(sc_cmd); 1777 goto out; 1778 } 1779 1780 rpriv = rport->dd_data; 1781 1782 if (!fc_fcp_lport_queue_ready(lport)) { 1783 if (lport->qfull) 1784 fc_fcp_can_queue_ramp_down(lport); 1785 rc = SCSI_MLQUEUE_HOST_BUSY; 1786 goto out; 1787 } 1788 1789 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1790 if (fsp == NULL) { 1791 rc = SCSI_MLQUEUE_HOST_BUSY; 1792 goto out; 1793 } 1794 1795 /* 1796 * build the libfc request pkt 1797 */ 1798 fsp->cmd = sc_cmd; /* save the cmd */ 1799 fsp->lp = lport; /* save the softc ptr */ 1800 fsp->rport = rport; /* set the remote port ptr */ 1801 fsp->xfer_ddp = FC_XID_UNKNOWN; 1802 sc_cmd->scsi_done = done; 1803 1804 /* 1805 * set up the transfer length 1806 */ 1807 fsp->data_len = scsi_bufflen(sc_cmd); 1808 fsp->xfer_len = 0; 1809 1810 /* 1811 * setup the data direction 1812 */ 1813 stats = fc_lport_get_stats(lport); 1814 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1815 fsp->req_flags = FC_SRB_READ; 1816 stats->InputRequests++; 1817 stats->InputMegabytes = fsp->data_len; 1818 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1819 fsp->req_flags = FC_SRB_WRITE; 1820 stats->OutputRequests++; 1821 stats->OutputMegabytes = fsp->data_len; 1822 } else { 1823 fsp->req_flags = 0; 1824 stats->ControlRequests++; 1825 } 1826 1827 fsp->tgt_flags = rpriv->flags; 1828 1829 init_timer(&fsp->timer); 1830 fsp->timer.data = (unsigned long)fsp; 1831 1832 /* 1833 * send it to the lower layer 1834 * if we get -1 return then put the request in the pending 1835 * queue. 1836 */ 1837 rval = fc_fcp_pkt_send(lport, fsp); 1838 if (rval != 0) { 1839 fsp->state = FC_SRB_FREE; 1840 fc_fcp_pkt_release(fsp); 1841 rc = SCSI_MLQUEUE_HOST_BUSY; 1842 } 1843 out: 1844 spin_lock_irq(lport->host->host_lock); 1845 return rc; 1846 } 1847 EXPORT_SYMBOL(fc_queuecommand); 1848 1849 /** 1850 * fc_io_compl() - Handle responses for completed commands 1851 * @fsp: The FCP packet that is complete 1852 * 1853 * Translates fcp_pkt errors to a Linux SCSI errors. 1854 * The fcp packet lock must be held when calling. 1855 */ 1856 static void fc_io_compl(struct fc_fcp_pkt *fsp) 1857 { 1858 struct fc_fcp_internal *si; 1859 struct scsi_cmnd *sc_cmd; 1860 struct fc_lport *lport; 1861 unsigned long flags; 1862 1863 /* release outstanding ddp context */ 1864 fc_fcp_ddp_done(fsp); 1865 1866 fsp->state |= FC_SRB_COMPL; 1867 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1868 spin_unlock_bh(&fsp->scsi_pkt_lock); 1869 del_timer_sync(&fsp->timer); 1870 spin_lock_bh(&fsp->scsi_pkt_lock); 1871 } 1872 1873 lport = fsp->lp; 1874 si = fc_get_scsi_internal(lport); 1875 if (!fsp->cmd) 1876 return; 1877 1878 /* 1879 * if can_queue ramp down is done then try can_queue ramp up 1880 * since commands are completing now. 1881 */ 1882 if (si->last_can_queue_ramp_down_time) 1883 fc_fcp_can_queue_ramp_up(lport); 1884 1885 sc_cmd = fsp->cmd; 1886 fsp->cmd = NULL; 1887 1888 if (!sc_cmd->SCp.ptr) 1889 return; 1890 1891 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1892 switch (fsp->status_code) { 1893 case FC_COMPLETE: 1894 if (fsp->cdb_status == 0) { 1895 /* 1896 * good I/O status 1897 */ 1898 sc_cmd->result = DID_OK << 16; 1899 if (fsp->scsi_resid) 1900 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1901 } else { 1902 /* 1903 * transport level I/O was ok but scsi 1904 * has non zero status 1905 */ 1906 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1907 } 1908 break; 1909 case FC_ERROR: 1910 sc_cmd->result = DID_ERROR << 16; 1911 break; 1912 case FC_DATA_UNDRUN: 1913 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1914 /* 1915 * scsi status is good but transport level 1916 * underrun. 1917 */ 1918 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ? 1919 DID_OK : DID_ERROR) << 16; 1920 } else { 1921 /* 1922 * scsi got underrun, this is an error 1923 */ 1924 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1925 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1926 } 1927 break; 1928 case FC_DATA_OVRRUN: 1929 /* 1930 * overrun is an error 1931 */ 1932 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1933 break; 1934 case FC_CMD_ABORTED: 1935 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1936 break; 1937 case FC_CMD_TIME_OUT: 1938 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1939 break; 1940 case FC_CMD_RESET: 1941 sc_cmd->result = (DID_RESET << 16); 1942 break; 1943 case FC_HRD_ERROR: 1944 sc_cmd->result = (DID_NO_CONNECT << 16); 1945 break; 1946 default: 1947 sc_cmd->result = (DID_ERROR << 16); 1948 break; 1949 } 1950 1951 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1952 list_del(&fsp->list); 1953 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1954 sc_cmd->SCp.ptr = NULL; 1955 sc_cmd->scsi_done(sc_cmd); 1956 1957 /* release ref from initial allocation in queue command */ 1958 fc_fcp_pkt_release(fsp); 1959 } 1960 1961 /** 1962 * fc_eh_abort() - Abort a command 1963 * @sc_cmd: The SCSI command to abort 1964 * 1965 * From SCSI host template. 1966 * Send an ABTS to the target device and wait for the response. 1967 */ 1968 int fc_eh_abort(struct scsi_cmnd *sc_cmd) 1969 { 1970 struct fc_fcp_pkt *fsp; 1971 struct fc_lport *lport; 1972 int rc = FAILED; 1973 unsigned long flags; 1974 1975 lport = shost_priv(sc_cmd->device->host); 1976 if (lport->state != LPORT_ST_READY) 1977 return rc; 1978 else if (!lport->link_up) 1979 return rc; 1980 1981 spin_lock_irqsave(lport->host->host_lock, flags); 1982 fsp = CMD_SP(sc_cmd); 1983 if (!fsp) { 1984 /* command completed while scsi eh was setting up */ 1985 spin_unlock_irqrestore(lport->host->host_lock, flags); 1986 return SUCCESS; 1987 } 1988 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 1989 fc_fcp_pkt_hold(fsp); 1990 spin_unlock_irqrestore(lport->host->host_lock, flags); 1991 1992 if (fc_fcp_lock_pkt(fsp)) { 1993 /* completed while we were waiting for timer to be deleted */ 1994 rc = SUCCESS; 1995 goto release_pkt; 1996 } 1997 1998 rc = fc_fcp_pkt_abort(fsp); 1999 fc_fcp_unlock_pkt(fsp); 2000 2001 release_pkt: 2002 fc_fcp_pkt_release(fsp); 2003 return rc; 2004 } 2005 EXPORT_SYMBOL(fc_eh_abort); 2006 2007 /** 2008 * fc_eh_device_reset() - Reset a single LUN 2009 * @sc_cmd: The SCSI command which identifies the device whose 2010 * LUN is to be reset 2011 * 2012 * Set from SCSI host template. 2013 */ 2014 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2015 { 2016 struct fc_lport *lport; 2017 struct fc_fcp_pkt *fsp; 2018 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2019 int rc = FAILED; 2020 int rval; 2021 2022 rval = fc_remote_port_chkready(rport); 2023 if (rval) 2024 goto out; 2025 2026 lport = shost_priv(sc_cmd->device->host); 2027 2028 if (lport->state != LPORT_ST_READY) 2029 return rc; 2030 2031 FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id); 2032 2033 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2034 if (fsp == NULL) { 2035 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2036 goto out; 2037 } 2038 2039 /* 2040 * Build the libfc request pkt. Do not set the scsi cmnd, because 2041 * the sc passed in is not setup for execution like when sent 2042 * through the queuecommand callout. 2043 */ 2044 fsp->lp = lport; /* save the softc ptr */ 2045 fsp->rport = rport; /* set the remote port ptr */ 2046 2047 /* 2048 * flush outstanding commands 2049 */ 2050 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2051 fsp->state = FC_SRB_FREE; 2052 fc_fcp_pkt_release(fsp); 2053 2054 out: 2055 return rc; 2056 } 2057 EXPORT_SYMBOL(fc_eh_device_reset); 2058 2059 /** 2060 * fc_eh_host_reset() - Reset a Scsi_Host. 2061 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2062 */ 2063 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2064 { 2065 struct Scsi_Host *shost = sc_cmd->device->host; 2066 struct fc_lport *lport = shost_priv(shost); 2067 unsigned long wait_tmo; 2068 2069 FC_SCSI_DBG(lport, "Resetting host\n"); 2070 2071 lport->tt.lport_reset(lport); 2072 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2073 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2074 wait_tmo)) 2075 msleep(1000); 2076 2077 if (fc_fcp_lport_queue_ready(lport)) { 2078 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2079 "on port (%6x)\n", fc_host_port_id(lport->host)); 2080 return SUCCESS; 2081 } else { 2082 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2083 "port (%6x) is not ready.\n", 2084 fc_host_port_id(lport->host)); 2085 return FAILED; 2086 } 2087 } 2088 EXPORT_SYMBOL(fc_eh_host_reset); 2089 2090 /** 2091 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2092 * @sdev: The SCSI device that identifies the SCSI host 2093 * 2094 * Configures queue depth based on host's cmd_per_len. If not set 2095 * then we use the libfc default. 2096 */ 2097 int fc_slave_alloc(struct scsi_device *sdev) 2098 { 2099 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2100 2101 if (!rport || fc_remote_port_chkready(rport)) 2102 return -ENXIO; 2103 2104 if (sdev->tagged_supported) 2105 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2106 else 2107 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2108 FC_FCP_DFLT_QUEUE_DEPTH); 2109 2110 return 0; 2111 } 2112 EXPORT_SYMBOL(fc_slave_alloc); 2113 2114 /** 2115 * fc_change_queue_depth() - Change a device's queue depth 2116 * @sdev: The SCSI device whose queue depth is to change 2117 * @qdepth: The new queue depth 2118 * @reason: The resason for the change 2119 */ 2120 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2121 { 2122 switch (reason) { 2123 case SCSI_QDEPTH_DEFAULT: 2124 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2125 break; 2126 case SCSI_QDEPTH_QFULL: 2127 scsi_track_queue_full(sdev, qdepth); 2128 break; 2129 case SCSI_QDEPTH_RAMP_UP: 2130 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2131 break; 2132 default: 2133 return -EOPNOTSUPP; 2134 } 2135 return sdev->queue_depth; 2136 } 2137 EXPORT_SYMBOL(fc_change_queue_depth); 2138 2139 /** 2140 * fc_change_queue_type() - Change a device's queue type 2141 * @sdev: The SCSI device whose queue depth is to change 2142 * @tag_type: Identifier for queue type 2143 */ 2144 int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2145 { 2146 if (sdev->tagged_supported) { 2147 scsi_set_tag_type(sdev, tag_type); 2148 if (tag_type) 2149 scsi_activate_tcq(sdev, sdev->queue_depth); 2150 else 2151 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2152 } else 2153 tag_type = 0; 2154 2155 return tag_type; 2156 } 2157 EXPORT_SYMBOL(fc_change_queue_type); 2158 2159 /** 2160 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2161 * @lport: The local port that no longer needs the FCP layer 2162 */ 2163 void fc_fcp_destroy(struct fc_lport *lport) 2164 { 2165 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2166 2167 if (!list_empty(&si->scsi_pkt_queue)) 2168 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2169 "port (%6x)\n", fc_host_port_id(lport->host)); 2170 2171 mempool_destroy(si->scsi_pkt_pool); 2172 kfree(si); 2173 lport->scsi_priv = NULL; 2174 } 2175 EXPORT_SYMBOL(fc_fcp_destroy); 2176 2177 int fc_setup_fcp() 2178 { 2179 int rc = 0; 2180 2181 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2182 sizeof(struct fc_fcp_pkt), 2183 0, SLAB_HWCACHE_ALIGN, NULL); 2184 if (!scsi_pkt_cachep) { 2185 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2186 "module load failed!"); 2187 rc = -ENOMEM; 2188 } 2189 2190 return rc; 2191 } 2192 2193 void fc_destroy_fcp() 2194 { 2195 if (scsi_pkt_cachep) 2196 kmem_cache_destroy(scsi_pkt_cachep); 2197 } 2198 2199 /** 2200 * fc_fcp_init() - Initialize the FCP layer for a local port 2201 * @lport: The local port to initialize the exchange layer for 2202 */ 2203 int fc_fcp_init(struct fc_lport *lport) 2204 { 2205 int rc; 2206 struct fc_fcp_internal *si; 2207 2208 if (!lport->tt.fcp_cmd_send) 2209 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2210 2211 if (!lport->tt.fcp_cleanup) 2212 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2213 2214 if (!lport->tt.fcp_abort_io) 2215 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2216 2217 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2218 if (!si) 2219 return -ENOMEM; 2220 lport->scsi_priv = si; 2221 si->max_can_queue = lport->host->can_queue; 2222 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2223 spin_lock_init(&si->scsi_queue_lock); 2224 2225 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2226 if (!si->scsi_pkt_pool) { 2227 rc = -ENOMEM; 2228 goto free_internal; 2229 } 2230 return 0; 2231 2232 free_internal: 2233 kfree(si); 2234 return rc; 2235 } 2236 EXPORT_SYMBOL(fc_fcp_init); 2237