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 static struct kmem_cache *scsi_pkt_cachep; 46 47 /* SRB state definitions */ 48 #define FC_SRB_FREE 0 /* cmd is free */ 49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ 53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 56 57 #define FC_SRB_READ (1 << 1) 58 #define FC_SRB_WRITE (1 << 0) 59 60 /* 61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock 62 */ 63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 68 69 /** 70 * struct fc_fcp_internal - FCP layer internal data 71 * @scsi_pkt_pool: Memory pool to draw FCP packets from 72 * @scsi_queue_lock: Protects the scsi_pkt_queue 73 * @scsi_pkt_queue: Current FCP packets 74 * @last_can_queue_ramp_down_time: ramp down time 75 * @last_can_queue_ramp_up_time: ramp up time 76 * @max_can_queue: max can_queue size 77 */ 78 struct 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 */ 93 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 94 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 95 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 96 static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 97 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 98 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 99 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); 100 static void fc_fcp_timeout(unsigned long); 101 static void fc_fcp_rec(struct fc_fcp_pkt *); 102 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 103 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 104 static void fc_io_compl(struct fc_fcp_pkt *); 105 106 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 107 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 108 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 109 110 /* 111 * command status codes 112 */ 113 #define FC_COMPLETE 0 114 #define FC_CMD_ABORTED 1 115 #define FC_CMD_RESET 2 116 #define FC_CMD_PLOGO 3 117 #define FC_SNS_RCV 4 118 #define FC_TRANS_ERR 5 119 #define FC_DATA_OVRRUN 6 120 #define FC_DATA_UNDRUN 7 121 #define FC_ERROR 8 122 #define FC_HRD_ERROR 9 123 #define FC_CRC_ERROR 10 124 #define FC_TIMED_OUT 11 125 126 /* 127 * Error recovery timeout values. 128 */ 129 #define FC_SCSI_TM_TOV (10 * HZ) 130 #define FC_HOST_RESET_TIMEOUT (30 * HZ) 131 #define FC_CAN_QUEUE_PERIOD (60 * HZ) 132 133 #define FC_MAX_ERROR_CNT 5 134 #define FC_MAX_RECOV_RETRY 3 135 136 #define FC_FCP_DFLT_QUEUE_DEPTH 32 137 138 /** 139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 140 * @lport: The local port that the FCP packet is for 141 * @gfp: GFP flags for allocation 142 * 143 * Return value: fcp_pkt structure or null on allocation failure. 144 * Context: Can be called from process context, no lock is required. 145 */ 146 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 147 { 148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 149 struct fc_fcp_pkt *fsp; 150 151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 152 if (fsp) { 153 memset(fsp, 0, sizeof(*fsp)); 154 fsp->lp = lport; 155 fsp->xfer_ddp = FC_XID_UNKNOWN; 156 atomic_set(&fsp->ref_cnt, 1); 157 init_timer(&fsp->timer); 158 fsp->timer.data = (unsigned long)fsp; 159 INIT_LIST_HEAD(&fsp->list); 160 spin_lock_init(&fsp->scsi_pkt_lock); 161 } else { 162 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; 163 put_cpu(); 164 } 165 return fsp; 166 } 167 168 /** 169 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 170 * @fsp: The FCP packet to be released 171 * 172 * Context: Can be called from process or interrupt context, 173 * no lock is required. 174 */ 175 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 176 { 177 if (atomic_dec_and_test(&fsp->ref_cnt)) { 178 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 179 180 mempool_free(fsp, si->scsi_pkt_pool); 181 } 182 } 183 184 /** 185 * fc_fcp_pkt_hold() - Hold a fcp_pkt 186 * @fsp: The FCP packet to be held 187 */ 188 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 189 { 190 atomic_inc(&fsp->ref_cnt); 191 } 192 193 /** 194 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt 195 * @seq: The sequence that the FCP packet is on (required by destructor API) 196 * @fsp: The FCP packet to be released 197 * 198 * This routine is called by a destructor callback in the exch_seq_send() 199 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 200 * argument even though it is not used by this routine. 201 * 202 * Context: No locking required. 203 */ 204 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 205 { 206 fc_fcp_pkt_release(fsp); 207 } 208 209 /** 210 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 211 * @fsp: The FCP packet to be locked and incremented 212 * 213 * We should only return error if we return a command to SCSI-ml before 214 * getting a response. This can happen in cases where we send a abort, but 215 * do not wait for the response and the abort and command can be passing 216 * each other on the wire/network-layer. 217 * 218 * Note: this function locks the packet and gets a reference to allow 219 * callers to call the completion function while the lock is held and 220 * not have to worry about the packets refcount. 221 * 222 * TODO: Maybe we should just have callers grab/release the lock and 223 * have a function that they call to verify the fsp and grab a ref if 224 * needed. 225 */ 226 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 227 { 228 spin_lock_bh(&fsp->scsi_pkt_lock); 229 if (fsp->state & FC_SRB_COMPL) { 230 spin_unlock_bh(&fsp->scsi_pkt_lock); 231 return -EPERM; 232 } 233 234 fc_fcp_pkt_hold(fsp); 235 return 0; 236 } 237 238 /** 239 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 240 * reference count 241 * @fsp: The FCP packet to be unlocked and decremented 242 */ 243 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 244 { 245 spin_unlock_bh(&fsp->scsi_pkt_lock); 246 fc_fcp_pkt_release(fsp); 247 } 248 249 /** 250 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 251 * @fsp: The FCP packet to start a timer for 252 * @delay: The timeout period in jiffies 253 */ 254 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 255 { 256 if (!(fsp->state & FC_SRB_COMPL)) 257 mod_timer(&fsp->timer, jiffies + delay); 258 } 259 260 /** 261 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 262 * fcp_pkt 263 * @fsp: The FCP packet to abort exchanges on 264 */ 265 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 266 { 267 if (!fsp->seq_ptr) 268 return -EINVAL; 269 270 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; 271 put_cpu(); 272 273 fsp->state |= FC_SRB_ABORT_PENDING; 274 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); 275 } 276 277 /** 278 * fc_fcp_retry_cmd() - Retry a fcp_pkt 279 * @fsp: The FCP packet to be retried 280 * 281 * Sets the status code to be FC_ERROR and then calls 282 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 283 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 284 * The SCSI-ml will retry the command. 285 */ 286 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) 287 { 288 if (fsp->seq_ptr) { 289 fsp->lp->tt.exch_done(fsp->seq_ptr); 290 fsp->seq_ptr = NULL; 291 } 292 293 fsp->state &= ~FC_SRB_ABORT_PENDING; 294 fsp->io_status = 0; 295 fsp->status_code = FC_ERROR; 296 fc_fcp_complete_locked(fsp); 297 } 298 299 /** 300 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 301 * @fsp: The FCP packet that will manage the DDP frames 302 * @xid: The XID that will be used for the DDP exchange 303 */ 304 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 305 { 306 struct fc_lport *lport; 307 308 lport = fsp->lp; 309 if ((fsp->req_flags & FC_SRB_READ) && 310 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 311 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 312 scsi_sg_count(fsp->cmd))) 313 fsp->xfer_ddp = xid; 314 } 315 } 316 317 /** 318 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 319 * DDP related resources for a fcp_pkt 320 * @fsp: The FCP packet that DDP had been used on 321 */ 322 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 323 { 324 struct fc_lport *lport; 325 326 if (!fsp) 327 return; 328 329 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 330 return; 331 332 lport = fsp->lp; 333 if (lport->tt.ddp_done) { 334 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 335 fsp->xfer_ddp = FC_XID_UNKNOWN; 336 } 337 } 338 339 /** 340 * fc_fcp_can_queue_ramp_up() - increases can_queue 341 * @lport: lport to ramp up can_queue 342 */ 343 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 344 { 345 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 346 unsigned long flags; 347 int can_queue; 348 349 spin_lock_irqsave(lport->host->host_lock, flags); 350 351 if (si->last_can_queue_ramp_up_time && 352 (time_before(jiffies, si->last_can_queue_ramp_up_time + 353 FC_CAN_QUEUE_PERIOD))) 354 goto unlock; 355 356 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 357 FC_CAN_QUEUE_PERIOD)) 358 goto unlock; 359 360 si->last_can_queue_ramp_up_time = jiffies; 361 362 can_queue = lport->host->can_queue << 1; 363 if (can_queue >= si->max_can_queue) { 364 can_queue = si->max_can_queue; 365 si->last_can_queue_ramp_down_time = 0; 366 } 367 lport->host->can_queue = can_queue; 368 shost_printk(KERN_ERR, lport->host, "libfc: increased " 369 "can_queue to %d.\n", can_queue); 370 371 unlock: 372 spin_unlock_irqrestore(lport->host->host_lock, flags); 373 } 374 375 /** 376 * fc_fcp_can_queue_ramp_down() - reduces can_queue 377 * @lport: lport to reduce can_queue 378 * 379 * If we are getting memory allocation failures, then we may 380 * be trying to execute too many commands. We let the running 381 * commands complete or timeout, then try again with a reduced 382 * can_queue. Eventually we will hit the point where we run 383 * on all reserved structs. 384 */ 385 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 386 { 387 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 388 unsigned long flags; 389 int can_queue; 390 391 spin_lock_irqsave(lport->host->host_lock, flags); 392 393 if (si->last_can_queue_ramp_down_time && 394 (time_before(jiffies, si->last_can_queue_ramp_down_time + 395 FC_CAN_QUEUE_PERIOD))) 396 goto unlock; 397 398 si->last_can_queue_ramp_down_time = jiffies; 399 400 can_queue = lport->host->can_queue; 401 can_queue >>= 1; 402 if (!can_queue) 403 can_queue = 1; 404 lport->host->can_queue = can_queue; 405 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" 406 "Reducing can_queue to %d.\n", can_queue); 407 408 unlock: 409 spin_unlock_irqrestore(lport->host->host_lock, flags); 410 } 411 412 /* 413 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 414 * @lport: fc lport struct 415 * @len: payload length 416 * 417 * Allocates fc_frame structure and buffer but if fails to allocate 418 * then reduce can_queue. 419 */ 420 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 421 size_t len) 422 { 423 struct fc_frame *fp; 424 425 fp = fc_frame_alloc(lport, len); 426 if (likely(fp)) 427 return fp; 428 429 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; 430 put_cpu(); 431 /* error case */ 432 fc_fcp_can_queue_ramp_down(lport); 433 return NULL; 434 } 435 436 /** 437 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 438 * @fsp: The FCP packet the data is on 439 * @fp: The data frame 440 */ 441 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 442 { 443 struct scsi_cmnd *sc = fsp->cmd; 444 struct fc_lport *lport = fsp->lp; 445 struct fc_stats *stats; 446 struct fc_frame_header *fh; 447 size_t start_offset; 448 size_t offset; 449 u32 crc; 450 u32 copy_len = 0; 451 size_t len; 452 void *buf; 453 struct scatterlist *sg; 454 u32 nents; 455 u8 host_bcode = FC_COMPLETE; 456 457 fh = fc_frame_header_get(fp); 458 offset = ntohl(fh->fh_parm_offset); 459 start_offset = offset; 460 len = fr_len(fp) - sizeof(*fh); 461 buf = fc_frame_payload_get(fp, 0); 462 463 /* 464 * if this I/O is ddped then clear it and initiate recovery since data 465 * frames are expected to be placed directly in that case. 466 * 467 * Indicate error to scsi-ml because something went wrong with the 468 * ddp handling to get us here. 469 */ 470 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 471 fc_fcp_ddp_done(fsp); 472 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 473 host_bcode = FC_ERROR; 474 goto err; 475 } 476 if (offset + len > fsp->data_len) { 477 /* this should never happen */ 478 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 479 fc_frame_crc_check(fp)) 480 goto crc_err; 481 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 482 "data_len %x\n", len, offset, fsp->data_len); 483 484 /* Data is corrupted indicate scsi-ml should retry */ 485 host_bcode = FC_DATA_OVRRUN; 486 goto err; 487 } 488 if (offset != fsp->xfer_len) 489 fsp->state |= FC_SRB_DISCONTIG; 490 491 sg = scsi_sglist(sc); 492 nents = scsi_sg_count(sc); 493 494 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 495 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 496 &offset, NULL); 497 } else { 498 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 499 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 500 &offset, &crc); 501 buf = fc_frame_payload_get(fp, 0); 502 if (len % 4) 503 crc = crc32(crc, buf + len, 4 - (len % 4)); 504 505 if (~crc != le32_to_cpu(fr_crc(fp))) { 506 crc_err: 507 stats = per_cpu_ptr(lport->stats, get_cpu()); 508 stats->ErrorFrames++; 509 /* per cpu count, not total count, but OK for limit */ 510 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) 511 printk(KERN_WARNING "libfc: CRC error on data " 512 "frame for port (%6.6x)\n", 513 lport->port_id); 514 put_cpu(); 515 /* 516 * Assume the frame is total garbage. 517 * We may have copied it over the good part 518 * of the buffer. 519 * If so, we need to retry the entire operation. 520 * Otherwise, ignore it. 521 */ 522 if (fsp->state & FC_SRB_DISCONTIG) { 523 host_bcode = FC_CRC_ERROR; 524 goto err; 525 } 526 return; 527 } 528 } 529 530 if (fsp->xfer_contig_end == start_offset) 531 fsp->xfer_contig_end += copy_len; 532 fsp->xfer_len += copy_len; 533 534 /* 535 * In the very rare event that this data arrived after the response 536 * and completes the transfer, call the completion handler. 537 */ 538 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 539 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) 540 fc_fcp_complete_locked(fsp); 541 return; 542 err: 543 fc_fcp_recovery(fsp, host_bcode); 544 } 545 546 /** 547 * fc_fcp_send_data() - Send SCSI data to a target 548 * @fsp: The FCP packet the data is on 549 * @sp: The sequence the data is to be sent on 550 * @offset: The starting offset for this data request 551 * @seq_blen: The burst length for this data request 552 * 553 * Called after receiving a Transfer Ready data descriptor. 554 * If the LLD is capable of sequence offload then send down the 555 * seq_blen amount of data in single frame, otherwise send 556 * multiple frames of the maximum frame payload supported by 557 * the target port. 558 */ 559 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 560 size_t offset, size_t seq_blen) 561 { 562 struct fc_exch *ep; 563 struct scsi_cmnd *sc; 564 struct scatterlist *sg; 565 struct fc_frame *fp = NULL; 566 struct fc_lport *lport = fsp->lp; 567 struct page *page; 568 size_t remaining; 569 size_t t_blen; 570 size_t tlen; 571 size_t sg_bytes; 572 size_t frame_offset, fh_parm_offset; 573 size_t off; 574 int error; 575 void *data = NULL; 576 void *page_addr; 577 int using_sg = lport->sg_supp; 578 u32 f_ctl; 579 580 WARN_ON(seq_blen <= 0); 581 if (unlikely(offset + seq_blen > fsp->data_len)) { 582 /* this should never happen */ 583 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 584 "offset %zx\n", seq_blen, offset); 585 fc_fcp_send_abort(fsp); 586 return 0; 587 } else if (offset != fsp->xfer_len) { 588 /* Out of Order Data Request - no problem, but unexpected. */ 589 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 590 "seq_blen %zx offset %zx\n", seq_blen, offset); 591 } 592 593 /* 594 * if LLD is capable of seq_offload then set transport 595 * burst length (t_blen) to seq_blen, otherwise set t_blen 596 * to max FC frame payload previously set in fsp->max_payload. 597 */ 598 t_blen = fsp->max_payload; 599 if (lport->seq_offload) { 600 t_blen = min(seq_blen, (size_t)lport->lso_max); 601 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 602 fsp, seq_blen, lport->lso_max, t_blen); 603 } 604 605 if (t_blen > 512) 606 t_blen &= ~(512 - 1); /* round down to block size */ 607 sc = fsp->cmd; 608 609 remaining = seq_blen; 610 fh_parm_offset = frame_offset = offset; 611 tlen = 0; 612 seq = lport->tt.seq_start_next(seq); 613 f_ctl = FC_FC_REL_OFF; 614 WARN_ON(!seq); 615 616 sg = scsi_sglist(sc); 617 618 while (remaining > 0 && sg) { 619 if (offset >= sg->length) { 620 offset -= sg->length; 621 sg = sg_next(sg); 622 continue; 623 } 624 if (!fp) { 625 tlen = min(t_blen, remaining); 626 627 /* 628 * TODO. Temporary workaround. fc_seq_send() can't 629 * handle odd lengths in non-linear skbs. 630 * This will be the final fragment only. 631 */ 632 if (tlen % 4) 633 using_sg = 0; 634 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 635 if (!fp) 636 return -ENOMEM; 637 638 data = fc_frame_header_get(fp) + 1; 639 fh_parm_offset = frame_offset; 640 fr_max_payload(fp) = fsp->max_payload; 641 } 642 643 off = offset + sg->offset; 644 sg_bytes = min(tlen, sg->length - offset); 645 sg_bytes = min(sg_bytes, 646 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 647 page = sg_page(sg) + (off >> PAGE_SHIFT); 648 if (using_sg) { 649 get_page(page); 650 skb_fill_page_desc(fp_skb(fp), 651 skb_shinfo(fp_skb(fp))->nr_frags, 652 page, off & ~PAGE_MASK, sg_bytes); 653 fp_skb(fp)->data_len += sg_bytes; 654 fr_len(fp) += sg_bytes; 655 fp_skb(fp)->truesize += PAGE_SIZE; 656 } else { 657 /* 658 * The scatterlist item may be bigger than PAGE_SIZE, 659 * but we must not cross pages inside the kmap. 660 */ 661 page_addr = kmap_atomic(page); 662 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 663 sg_bytes); 664 kunmap_atomic(page_addr); 665 data += sg_bytes; 666 } 667 offset += sg_bytes; 668 frame_offset += sg_bytes; 669 tlen -= sg_bytes; 670 remaining -= sg_bytes; 671 672 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 673 (tlen)) 674 continue; 675 676 /* 677 * Send sequence with transfer sequence initiative in case 678 * this is last FCP frame of the sequence. 679 */ 680 if (remaining == 0) 681 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 682 683 ep = fc_seq_exch(seq); 684 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 685 FC_TYPE_FCP, f_ctl, fh_parm_offset); 686 687 /* 688 * send fragment using for a sequence. 689 */ 690 error = lport->tt.seq_send(lport, seq, fp); 691 if (error) { 692 WARN_ON(1); /* send error should be rare */ 693 return error; 694 } 695 fp = NULL; 696 } 697 fsp->xfer_len += seq_blen; /* premature count? */ 698 return 0; 699 } 700 701 /** 702 * fc_fcp_abts_resp() - Receive an ABTS response 703 * @fsp: The FCP packet that is being aborted 704 * @fp: The response frame 705 */ 706 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 707 { 708 int ba_done = 1; 709 struct fc_ba_rjt *brp; 710 struct fc_frame_header *fh; 711 712 fh = fc_frame_header_get(fp); 713 switch (fh->fh_r_ctl) { 714 case FC_RCTL_BA_ACC: 715 break; 716 case FC_RCTL_BA_RJT: 717 brp = fc_frame_payload_get(fp, sizeof(*brp)); 718 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 719 break; 720 /* fall thru */ 721 default: 722 /* 723 * we will let the command timeout 724 * and scsi-ml recover in this case, 725 * therefore cleared the ba_done flag. 726 */ 727 ba_done = 0; 728 } 729 730 if (ba_done) { 731 fsp->state |= FC_SRB_ABORTED; 732 fsp->state &= ~FC_SRB_ABORT_PENDING; 733 734 if (fsp->wait_for_comp) 735 complete(&fsp->tm_done); 736 else 737 fc_fcp_complete_locked(fsp); 738 } 739 } 740 741 /** 742 * fc_fcp_recv() - Receive an FCP frame 743 * @seq: The sequence the frame is on 744 * @fp: The received frame 745 * @arg: The related FCP packet 746 * 747 * Context: Called from Soft IRQ context. Can not be called 748 * holding the FCP packet list lock. 749 */ 750 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 751 { 752 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 753 struct fc_lport *lport = fsp->lp; 754 struct fc_frame_header *fh; 755 struct fcp_txrdy *dd; 756 u8 r_ctl; 757 int rc = 0; 758 759 if (IS_ERR(fp)) { 760 fc_fcp_error(fsp, fp); 761 return; 762 } 763 764 fh = fc_frame_header_get(fp); 765 r_ctl = fh->fh_r_ctl; 766 767 if (lport->state != LPORT_ST_READY) 768 goto out; 769 if (fc_fcp_lock_pkt(fsp)) 770 goto out; 771 772 if (fh->fh_type == FC_TYPE_BLS) { 773 fc_fcp_abts_resp(fsp, fp); 774 goto unlock; 775 } 776 777 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) 778 goto unlock; 779 780 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 781 /* 782 * received XFER RDY from the target 783 * need to send data to the target 784 */ 785 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 786 dd = fc_frame_payload_get(fp, sizeof(*dd)); 787 WARN_ON(!dd); 788 789 rc = fc_fcp_send_data(fsp, seq, 790 (size_t) ntohl(dd->ft_data_ro), 791 (size_t) ntohl(dd->ft_burst_len)); 792 if (!rc) 793 seq->rec_data = fsp->xfer_len; 794 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 795 /* 796 * received a DATA frame 797 * next we will copy the data to the system buffer 798 */ 799 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 800 fc_fcp_recv_data(fsp, fp); 801 seq->rec_data = fsp->xfer_contig_end; 802 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 803 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 804 805 fc_fcp_resp(fsp, fp); 806 } else { 807 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 808 } 809 unlock: 810 fc_fcp_unlock_pkt(fsp); 811 out: 812 fc_frame_free(fp); 813 } 814 815 /** 816 * fc_fcp_resp() - Handler for FCP responses 817 * @fsp: The FCP packet the response is for 818 * @fp: The response frame 819 */ 820 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 821 { 822 struct fc_frame_header *fh; 823 struct fcp_resp *fc_rp; 824 struct fcp_resp_ext *rp_ex; 825 struct fcp_resp_rsp_info *fc_rp_info; 826 u32 plen; 827 u32 expected_len; 828 u32 respl = 0; 829 u32 snsl = 0; 830 u8 flags = 0; 831 832 plen = fr_len(fp); 833 fh = (struct fc_frame_header *)fr_hdr(fp); 834 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 835 goto len_err; 836 plen -= sizeof(*fh); 837 fc_rp = (struct fcp_resp *)(fh + 1); 838 fsp->cdb_status = fc_rp->fr_status; 839 flags = fc_rp->fr_flags; 840 fsp->scsi_comp_flags = flags; 841 expected_len = fsp->data_len; 842 843 /* if ddp, update xfer len */ 844 fc_fcp_ddp_done(fsp); 845 846 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 847 rp_ex = (void *)(fc_rp + 1); 848 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 849 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 850 goto len_err; 851 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 852 if (flags & FCP_RSP_LEN_VAL) { 853 respl = ntohl(rp_ex->fr_rsp_len); 854 if (respl != sizeof(*fc_rp_info)) 855 goto len_err; 856 if (fsp->wait_for_comp) { 857 /* Abuse cdb_status for rsp code */ 858 fsp->cdb_status = fc_rp_info->rsp_code; 859 complete(&fsp->tm_done); 860 /* 861 * tmfs will not have any scsi cmd so 862 * exit here 863 */ 864 return; 865 } 866 } 867 if (flags & FCP_SNS_LEN_VAL) { 868 snsl = ntohl(rp_ex->fr_sns_len); 869 if (snsl > SCSI_SENSE_BUFFERSIZE) 870 snsl = SCSI_SENSE_BUFFERSIZE; 871 memcpy(fsp->cmd->sense_buffer, 872 (char *)fc_rp_info + respl, snsl); 873 } 874 } 875 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 876 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 877 goto len_err; 878 if (flags & FCP_RESID_UNDER) { 879 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 880 /* 881 * The cmnd->underflow is the minimum number of 882 * bytes that must be transferred for this 883 * command. Provided a sense condition is not 884 * present, make sure the actual amount 885 * transferred is at least the underflow value 886 * or fail. 887 */ 888 if (!(flags & FCP_SNS_LEN_VAL) && 889 (fc_rp->fr_status == 0) && 890 (scsi_bufflen(fsp->cmd) - 891 fsp->scsi_resid) < fsp->cmd->underflow) 892 goto err; 893 expected_len -= fsp->scsi_resid; 894 } else { 895 fsp->status_code = FC_ERROR; 896 } 897 } 898 } 899 fsp->state |= FC_SRB_RCV_STATUS; 900 901 /* 902 * Check for missing or extra data frames. 903 */ 904 if (unlikely(fsp->xfer_len != expected_len)) { 905 if (fsp->xfer_len < expected_len) { 906 /* 907 * Some data may be queued locally, 908 * Wait a at least one jiffy to see if it is delivered. 909 * If this expires without data, we may do SRR. 910 */ 911 fc_fcp_timer_set(fsp, 2); 912 return; 913 } 914 fsp->status_code = FC_DATA_OVRRUN; 915 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 916 "len %x, data len %x\n", 917 fsp->rport->port_id, 918 fsp->xfer_len, expected_len, fsp->data_len); 919 } 920 fc_fcp_complete_locked(fsp); 921 return; 922 923 len_err: 924 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 925 "snsl %u\n", flags, fr_len(fp), respl, snsl); 926 err: 927 fsp->status_code = FC_ERROR; 928 fc_fcp_complete_locked(fsp); 929 } 930 931 /** 932 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 933 * fcp_pkt lock held 934 * @fsp: The FCP packet to be completed 935 * 936 * This function may sleep if a timer is pending. The packet lock must be 937 * held, and the host lock must not be held. 938 */ 939 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 940 { 941 struct fc_lport *lport = fsp->lp; 942 struct fc_seq *seq; 943 struct fc_exch *ep; 944 u32 f_ctl; 945 946 if (fsp->state & FC_SRB_ABORT_PENDING) 947 return; 948 949 if (fsp->state & FC_SRB_ABORTED) { 950 if (!fsp->status_code) 951 fsp->status_code = FC_CMD_ABORTED; 952 } else { 953 /* 954 * Test for transport underrun, independent of response 955 * underrun status. 956 */ 957 if (fsp->xfer_len < fsp->data_len && !fsp->io_status && 958 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 959 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 960 fsp->status_code = FC_DATA_UNDRUN; 961 fsp->io_status = 0; 962 } 963 } 964 965 seq = fsp->seq_ptr; 966 if (seq) { 967 fsp->seq_ptr = NULL; 968 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 969 struct fc_frame *conf_frame; 970 struct fc_seq *csp; 971 972 csp = lport->tt.seq_start_next(seq); 973 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 974 if (conf_frame) { 975 f_ctl = FC_FC_SEQ_INIT; 976 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 977 ep = fc_seq_exch(seq); 978 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 979 ep->did, ep->sid, 980 FC_TYPE_FCP, f_ctl, 0); 981 lport->tt.seq_send(lport, csp, conf_frame); 982 } 983 } 984 lport->tt.exch_done(seq); 985 } 986 /* 987 * Some resets driven by SCSI are not I/Os and do not have 988 * SCSI commands associated with the requests. We should not 989 * call I/O completion if we do not have a SCSI command. 990 */ 991 if (fsp->cmd) 992 fc_io_compl(fsp); 993 } 994 995 /** 996 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 997 * @fsp: The FCP packet whose exchanges should be canceled 998 * @error: The reason for the cancellation 999 */ 1000 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 1001 { 1002 struct fc_lport *lport = fsp->lp; 1003 1004 if (fsp->seq_ptr) { 1005 lport->tt.exch_done(fsp->seq_ptr); 1006 fsp->seq_ptr = NULL; 1007 } 1008 fsp->status_code = error; 1009 } 1010 1011 /** 1012 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1013 * @lport: The local port whose exchanges should be canceled 1014 * @id: The target's ID 1015 * @lun: The LUN 1016 * @error: The reason for cancellation 1017 * 1018 * If lun or id is -1, they are ignored. 1019 */ 1020 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1021 unsigned int lun, int error) 1022 { 1023 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1024 struct fc_fcp_pkt *fsp; 1025 struct scsi_cmnd *sc_cmd; 1026 unsigned long flags; 1027 1028 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1029 restart: 1030 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1031 sc_cmd = fsp->cmd; 1032 if (id != -1 && scmd_id(sc_cmd) != id) 1033 continue; 1034 1035 if (lun != -1 && sc_cmd->device->lun != lun) 1036 continue; 1037 1038 fc_fcp_pkt_hold(fsp); 1039 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1040 1041 if (!fc_fcp_lock_pkt(fsp)) { 1042 fc_fcp_cleanup_cmd(fsp, error); 1043 fc_io_compl(fsp); 1044 fc_fcp_unlock_pkt(fsp); 1045 } 1046 1047 fc_fcp_pkt_release(fsp); 1048 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1049 /* 1050 * while we dropped the lock multiple pkts could 1051 * have been released, so we have to start over. 1052 */ 1053 goto restart; 1054 } 1055 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1056 } 1057 1058 /** 1059 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1060 * @lport: The local port whose exchanges are to be aborted 1061 */ 1062 static void fc_fcp_abort_io(struct fc_lport *lport) 1063 { 1064 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1065 } 1066 1067 /** 1068 * fc_fcp_pkt_send() - Send a fcp_pkt 1069 * @lport: The local port to send the FCP packet on 1070 * @fsp: The FCP packet to send 1071 * 1072 * Return: Zero for success and -1 for failure 1073 * Locks: Called without locks held 1074 */ 1075 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1076 { 1077 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1078 unsigned long flags; 1079 int rc; 1080 1081 fsp->cmd->SCp.ptr = (char *)fsp; 1082 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1083 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1084 1085 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1086 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1087 1088 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1089 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1090 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1091 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1092 if (unlikely(rc)) { 1093 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1094 fsp->cmd->SCp.ptr = NULL; 1095 list_del(&fsp->list); 1096 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1097 } 1098 1099 return rc; 1100 } 1101 1102 /** 1103 * get_fsp_rec_tov() - Helper function to get REC_TOV 1104 * @fsp: the FCP packet 1105 * 1106 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 1107 */ 1108 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 1109 { 1110 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 1111 1112 return msecs_to_jiffies(rpriv->e_d_tov) + HZ; 1113 } 1114 1115 /** 1116 * fc_fcp_cmd_send() - Send a FCP command 1117 * @lport: The local port to send the command on 1118 * @fsp: The FCP packet the command is on 1119 * @resp: The handler for the response 1120 */ 1121 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1122 void (*resp)(struct fc_seq *, 1123 struct fc_frame *fp, 1124 void *arg)) 1125 { 1126 struct fc_frame *fp; 1127 struct fc_seq *seq; 1128 struct fc_rport *rport; 1129 struct fc_rport_libfc_priv *rpriv; 1130 const size_t len = sizeof(fsp->cdb_cmd); 1131 int rc = 0; 1132 1133 if (fc_fcp_lock_pkt(fsp)) 1134 return 0; 1135 1136 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1137 if (!fp) { 1138 rc = -1; 1139 goto unlock; 1140 } 1141 1142 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1143 fr_fsp(fp) = fsp; 1144 rport = fsp->rport; 1145 fsp->max_payload = rport->maxframe_size; 1146 rpriv = rport->dd_data; 1147 1148 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1149 rpriv->local_port->port_id, FC_TYPE_FCP, 1150 FC_FCTL_REQ, 0); 1151 1152 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, 1153 fsp, 0); 1154 if (!seq) { 1155 rc = -1; 1156 goto unlock; 1157 } 1158 fsp->seq_ptr = seq; 1159 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1160 1161 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1162 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1163 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1164 1165 unlock: 1166 fc_fcp_unlock_pkt(fsp); 1167 return rc; 1168 } 1169 1170 /** 1171 * fc_fcp_error() - Handler for FCP layer errors 1172 * @fsp: The FCP packet the error is on 1173 * @fp: The frame that has errored 1174 */ 1175 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1176 { 1177 int error = PTR_ERR(fp); 1178 1179 if (fc_fcp_lock_pkt(fsp)) 1180 return; 1181 1182 if (error == -FC_EX_CLOSED) { 1183 fc_fcp_retry_cmd(fsp); 1184 goto unlock; 1185 } 1186 1187 /* 1188 * clear abort pending, because the lower layer 1189 * decided to force completion. 1190 */ 1191 fsp->state &= ~FC_SRB_ABORT_PENDING; 1192 fsp->status_code = FC_CMD_PLOGO; 1193 fc_fcp_complete_locked(fsp); 1194 unlock: 1195 fc_fcp_unlock_pkt(fsp); 1196 } 1197 1198 /** 1199 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1200 * @fsp: The FCP packet to abort on 1201 * 1202 * Called to send an abort and then wait for abort completion 1203 */ 1204 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1205 { 1206 int rc = FAILED; 1207 unsigned long ticks_left; 1208 1209 if (fc_fcp_send_abort(fsp)) 1210 return FAILED; 1211 1212 init_completion(&fsp->tm_done); 1213 fsp->wait_for_comp = 1; 1214 1215 spin_unlock_bh(&fsp->scsi_pkt_lock); 1216 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1217 FC_SCSI_TM_TOV); 1218 spin_lock_bh(&fsp->scsi_pkt_lock); 1219 fsp->wait_for_comp = 0; 1220 1221 if (!ticks_left) { 1222 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1223 } else if (fsp->state & FC_SRB_ABORTED) { 1224 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1225 rc = SUCCESS; 1226 fc_fcp_complete_locked(fsp); 1227 } 1228 1229 return rc; 1230 } 1231 1232 /** 1233 * fc_lun_reset_send() - Send LUN reset command 1234 * @data: The FCP packet that identifies the LUN to be reset 1235 */ 1236 static void fc_lun_reset_send(unsigned long data) 1237 { 1238 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1239 struct fc_lport *lport = fsp->lp; 1240 1241 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1242 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1243 return; 1244 if (fc_fcp_lock_pkt(fsp)) 1245 return; 1246 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1247 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1248 fc_fcp_unlock_pkt(fsp); 1249 } 1250 } 1251 1252 /** 1253 * fc_lun_reset() - Send a LUN RESET command to a device 1254 * and wait for the reply 1255 * @lport: The local port to sent the command on 1256 * @fsp: The FCP packet that identifies the LUN to be reset 1257 * @id: The SCSI command ID 1258 * @lun: The LUN ID to be reset 1259 */ 1260 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1261 unsigned int id, unsigned int lun) 1262 { 1263 int rc; 1264 1265 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1266 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1267 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1268 1269 fsp->wait_for_comp = 1; 1270 init_completion(&fsp->tm_done); 1271 1272 fc_lun_reset_send((unsigned long)fsp); 1273 1274 /* 1275 * wait for completion of reset 1276 * after that make sure all commands are terminated 1277 */ 1278 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1279 1280 spin_lock_bh(&fsp->scsi_pkt_lock); 1281 fsp->state |= FC_SRB_COMPL; 1282 spin_unlock_bh(&fsp->scsi_pkt_lock); 1283 1284 del_timer_sync(&fsp->timer); 1285 1286 spin_lock_bh(&fsp->scsi_pkt_lock); 1287 if (fsp->seq_ptr) { 1288 lport->tt.exch_done(fsp->seq_ptr); 1289 fsp->seq_ptr = NULL; 1290 } 1291 fsp->wait_for_comp = 0; 1292 spin_unlock_bh(&fsp->scsi_pkt_lock); 1293 1294 if (!rc) { 1295 FC_SCSI_DBG(lport, "lun reset failed\n"); 1296 return FAILED; 1297 } 1298 1299 /* cdb_status holds the tmf's rsp code */ 1300 if (fsp->cdb_status != FCP_TMF_CMPL) 1301 return FAILED; 1302 1303 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1304 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1305 return SUCCESS; 1306 } 1307 1308 /** 1309 * fc_tm_done() - Task Management response handler 1310 * @seq: The sequence that the response is on 1311 * @fp: The response frame 1312 * @arg: The FCP packet the response is for 1313 */ 1314 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1315 { 1316 struct fc_fcp_pkt *fsp = arg; 1317 struct fc_frame_header *fh; 1318 1319 if (IS_ERR(fp)) { 1320 /* 1321 * If there is an error just let it timeout or wait 1322 * for TMF to be aborted if it timedout. 1323 * 1324 * scsi-eh will escalate for when either happens. 1325 */ 1326 return; 1327 } 1328 1329 if (fc_fcp_lock_pkt(fsp)) 1330 goto out; 1331 1332 /* 1333 * raced with eh timeout handler. 1334 */ 1335 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1336 goto out_unlock; 1337 1338 fh = fc_frame_header_get(fp); 1339 if (fh->fh_type != FC_TYPE_BLS) 1340 fc_fcp_resp(fsp, fp); 1341 fsp->seq_ptr = NULL; 1342 fsp->lp->tt.exch_done(seq); 1343 out_unlock: 1344 fc_fcp_unlock_pkt(fsp); 1345 out: 1346 fc_frame_free(fp); 1347 } 1348 1349 /** 1350 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1351 * @lport: The local port to be cleaned up 1352 */ 1353 static void fc_fcp_cleanup(struct fc_lport *lport) 1354 { 1355 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1356 } 1357 1358 /** 1359 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1360 * @data: The FCP packet that has timed out 1361 * 1362 * If REC is supported then just issue it and return. The REC exchange will 1363 * complete or time out and recovery can continue at that point. Otherwise, 1364 * if the response has been received without all the data it has been 1365 * ER_TIMEOUT since the response was received. If the response has not been 1366 * received we see if data was received recently. If it has been then we 1367 * continue waiting, otherwise, we abort the command. 1368 */ 1369 static void fc_fcp_timeout(unsigned long data) 1370 { 1371 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1372 struct fc_rport *rport = fsp->rport; 1373 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1374 1375 if (fc_fcp_lock_pkt(fsp)) 1376 return; 1377 1378 if (fsp->cdb_cmd.fc_tm_flags) 1379 goto unlock; 1380 1381 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1382 1383 if (fsp->state & FC_SRB_RCV_STATUS) 1384 fc_fcp_complete_locked(fsp); 1385 else if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1386 fc_fcp_rec(fsp); 1387 else 1388 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1389 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1390 unlock: 1391 fc_fcp_unlock_pkt(fsp); 1392 } 1393 1394 /** 1395 * fc_fcp_rec() - Send a REC ELS request 1396 * @fsp: The FCP packet to send the REC request on 1397 */ 1398 static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1399 { 1400 struct fc_lport *lport; 1401 struct fc_frame *fp; 1402 struct fc_rport *rport; 1403 struct fc_rport_libfc_priv *rpriv; 1404 1405 lport = fsp->lp; 1406 rport = fsp->rport; 1407 rpriv = rport->dd_data; 1408 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1409 fsp->status_code = FC_HRD_ERROR; 1410 fsp->io_status = 0; 1411 fc_fcp_complete_locked(fsp); 1412 return; 1413 } 1414 1415 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1416 if (!fp) 1417 goto retry; 1418 1419 fr_seq(fp) = fsp->seq_ptr; 1420 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1421 rpriv->local_port->port_id, FC_TYPE_ELS, 1422 FC_FCTL_REQ, 0); 1423 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1424 fc_fcp_rec_resp, fsp, 1425 2 * lport->r_a_tov)) { 1426 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1427 return; 1428 } 1429 retry: 1430 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1431 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1432 else 1433 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1434 } 1435 1436 /** 1437 * fc_fcp_rec_resp() - Handler for REC ELS responses 1438 * @seq: The sequence the response is on 1439 * @fp: The response frame 1440 * @arg: The FCP packet the response is on 1441 * 1442 * If the response is a reject then the scsi layer will handle 1443 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1444 * set the timeout and return. If the I/O was completed then complete the 1445 * exchange and tell the SCSI layer. 1446 */ 1447 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1448 { 1449 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1450 struct fc_els_rec_acc *recp; 1451 struct fc_els_ls_rjt *rjt; 1452 u32 e_stat; 1453 u8 opcode; 1454 u32 offset; 1455 enum dma_data_direction data_dir; 1456 enum fc_rctl r_ctl; 1457 struct fc_rport_libfc_priv *rpriv; 1458 1459 if (IS_ERR(fp)) { 1460 fc_fcp_rec_error(fsp, fp); 1461 return; 1462 } 1463 1464 if (fc_fcp_lock_pkt(fsp)) 1465 goto out; 1466 1467 fsp->recov_retry = 0; 1468 opcode = fc_frame_payload_op(fp); 1469 if (opcode == ELS_LS_RJT) { 1470 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1471 switch (rjt->er_reason) { 1472 default: 1473 FC_FCP_DBG(fsp, "device %x unexpected REC reject " 1474 "reason %d expl %d\n", 1475 fsp->rport->port_id, rjt->er_reason, 1476 rjt->er_explan); 1477 /* fall through */ 1478 case ELS_RJT_UNSUP: 1479 FC_FCP_DBG(fsp, "device does not support REC\n"); 1480 rpriv = fsp->rport->dd_data; 1481 /* 1482 * if we do not spport RECs or got some bogus 1483 * reason then resetup timer so we check for 1484 * making progress. 1485 */ 1486 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1487 break; 1488 case ELS_RJT_LOGIC: 1489 case ELS_RJT_UNAB: 1490 /* 1491 * If no data transfer, the command frame got dropped 1492 * so we just retry. If data was transferred, we 1493 * lost the response but the target has no record, 1494 * so we abort and retry. 1495 */ 1496 if (rjt->er_explan == ELS_EXPL_OXID_RXID && 1497 fsp->xfer_len == 0) { 1498 fc_fcp_retry_cmd(fsp); 1499 break; 1500 } 1501 fc_fcp_recovery(fsp, FC_ERROR); 1502 break; 1503 } 1504 } else if (opcode == ELS_LS_ACC) { 1505 if (fsp->state & FC_SRB_ABORTED) 1506 goto unlock_out; 1507 1508 data_dir = fsp->cmd->sc_data_direction; 1509 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1510 offset = ntohl(recp->reca_fc4value); 1511 e_stat = ntohl(recp->reca_e_stat); 1512 1513 if (e_stat & ESB_ST_COMPLETE) { 1514 1515 /* 1516 * The exchange is complete. 1517 * 1518 * For output, we must've lost the response. 1519 * For input, all data must've been sent. 1520 * We lost may have lost the response 1521 * (and a confirmation was requested) and maybe 1522 * some data. 1523 * 1524 * If all data received, send SRR 1525 * asking for response. If partial data received, 1526 * or gaps, SRR requests data at start of gap. 1527 * Recovery via SRR relies on in-order-delivery. 1528 */ 1529 if (data_dir == DMA_TO_DEVICE) { 1530 r_ctl = FC_RCTL_DD_CMD_STATUS; 1531 } else if (fsp->xfer_contig_end == offset) { 1532 r_ctl = FC_RCTL_DD_CMD_STATUS; 1533 } else { 1534 offset = fsp->xfer_contig_end; 1535 r_ctl = FC_RCTL_DD_SOL_DATA; 1536 } 1537 fc_fcp_srr(fsp, r_ctl, offset); 1538 } else if (e_stat & ESB_ST_SEQ_INIT) { 1539 /* 1540 * The remote port has the initiative, so just 1541 * keep waiting for it to complete. 1542 */ 1543 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1544 } else { 1545 1546 /* 1547 * The exchange is incomplete, we have seq. initiative. 1548 * Lost response with requested confirmation, 1549 * lost confirmation, lost transfer ready or 1550 * lost write data. 1551 * 1552 * For output, if not all data was received, ask 1553 * for transfer ready to be repeated. 1554 * 1555 * If we received or sent all the data, send SRR to 1556 * request response. 1557 * 1558 * If we lost a response, we may have lost some read 1559 * data as well. 1560 */ 1561 r_ctl = FC_RCTL_DD_SOL_DATA; 1562 if (data_dir == DMA_TO_DEVICE) { 1563 r_ctl = FC_RCTL_DD_CMD_STATUS; 1564 if (offset < fsp->data_len) 1565 r_ctl = FC_RCTL_DD_DATA_DESC; 1566 } else if (offset == fsp->xfer_contig_end) { 1567 r_ctl = FC_RCTL_DD_CMD_STATUS; 1568 } else if (fsp->xfer_contig_end < offset) { 1569 offset = fsp->xfer_contig_end; 1570 } 1571 fc_fcp_srr(fsp, r_ctl, offset); 1572 } 1573 } 1574 unlock_out: 1575 fc_fcp_unlock_pkt(fsp); 1576 out: 1577 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1578 fc_frame_free(fp); 1579 } 1580 1581 /** 1582 * fc_fcp_rec_error() - Handler for REC errors 1583 * @fsp: The FCP packet the error is on 1584 * @fp: The REC frame 1585 */ 1586 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1587 { 1588 int error = PTR_ERR(fp); 1589 1590 if (fc_fcp_lock_pkt(fsp)) 1591 goto out; 1592 1593 switch (error) { 1594 case -FC_EX_CLOSED: 1595 fc_fcp_retry_cmd(fsp); 1596 break; 1597 1598 default: 1599 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1600 fsp, fsp->rport->port_id, error); 1601 fsp->status_code = FC_CMD_PLOGO; 1602 /* fall through */ 1603 1604 case -FC_EX_TIMEOUT: 1605 /* 1606 * Assume REC or LS_ACC was lost. 1607 * The exchange manager will have aborted REC, so retry. 1608 */ 1609 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", 1610 fsp->rport->port_id, error, fsp->recov_retry, 1611 FC_MAX_RECOV_RETRY); 1612 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1613 fc_fcp_rec(fsp); 1614 else 1615 fc_fcp_recovery(fsp, FC_ERROR); 1616 break; 1617 } 1618 fc_fcp_unlock_pkt(fsp); 1619 out: 1620 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1621 } 1622 1623 /** 1624 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1625 * @fsp: The FCP pkt that needs to be aborted 1626 */ 1627 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1628 { 1629 fsp->status_code = code; 1630 fsp->cdb_status = 0; 1631 fsp->io_status = 0; 1632 /* 1633 * if this fails then we let the scsi command timer fire and 1634 * scsi-ml escalate. 1635 */ 1636 fc_fcp_send_abort(fsp); 1637 } 1638 1639 /** 1640 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1641 * @fsp: The FCP packet the SRR is to be sent on 1642 * @r_ctl: The R_CTL field for the SRR request 1643 * This is called after receiving status but insufficient data, or 1644 * when expecting status but the request has timed out. 1645 */ 1646 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1647 { 1648 struct fc_lport *lport = fsp->lp; 1649 struct fc_rport *rport; 1650 struct fc_rport_libfc_priv *rpriv; 1651 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1652 struct fc_seq *seq; 1653 struct fcp_srr *srr; 1654 struct fc_frame *fp; 1655 unsigned int rec_tov; 1656 1657 rport = fsp->rport; 1658 rpriv = rport->dd_data; 1659 1660 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1661 rpriv->rp_state != RPORT_ST_READY) 1662 goto retry; /* shouldn't happen */ 1663 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1664 if (!fp) 1665 goto retry; 1666 1667 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1668 memset(srr, 0, sizeof(*srr)); 1669 srr->srr_op = ELS_SRR; 1670 srr->srr_ox_id = htons(ep->oxid); 1671 srr->srr_rx_id = htons(ep->rxid); 1672 srr->srr_r_ctl = r_ctl; 1673 srr->srr_rel_off = htonl(offset); 1674 1675 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1676 rpriv->local_port->port_id, FC_TYPE_FCP, 1677 FC_FCTL_REQ, 0); 1678 1679 rec_tov = get_fsp_rec_tov(fsp); 1680 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, 1681 fc_fcp_pkt_destroy, 1682 fsp, jiffies_to_msecs(rec_tov)); 1683 if (!seq) 1684 goto retry; 1685 1686 fsp->recov_seq = seq; 1687 fsp->xfer_len = offset; 1688 fsp->xfer_contig_end = offset; 1689 fsp->state &= ~FC_SRB_RCV_STATUS; 1690 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1691 return; 1692 retry: 1693 fc_fcp_retry_cmd(fsp); 1694 } 1695 1696 /** 1697 * fc_fcp_srr_resp() - Handler for SRR response 1698 * @seq: The sequence the SRR is on 1699 * @fp: The SRR frame 1700 * @arg: The FCP packet the SRR is on 1701 */ 1702 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1703 { 1704 struct fc_fcp_pkt *fsp = arg; 1705 struct fc_frame_header *fh; 1706 1707 if (IS_ERR(fp)) { 1708 fc_fcp_srr_error(fsp, fp); 1709 return; 1710 } 1711 1712 if (fc_fcp_lock_pkt(fsp)) 1713 goto out; 1714 1715 fh = fc_frame_header_get(fp); 1716 /* 1717 * BUG? fc_fcp_srr_error calls exch_done which would release 1718 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1719 * then fc_exch_timeout would be sending an abort. The exch_done 1720 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1721 * an abort response though. 1722 */ 1723 if (fh->fh_type == FC_TYPE_BLS) { 1724 fc_fcp_unlock_pkt(fsp); 1725 return; 1726 } 1727 1728 switch (fc_frame_payload_op(fp)) { 1729 case ELS_LS_ACC: 1730 fsp->recov_retry = 0; 1731 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1732 break; 1733 case ELS_LS_RJT: 1734 default: 1735 fc_fcp_recovery(fsp, FC_ERROR); 1736 break; 1737 } 1738 fc_fcp_unlock_pkt(fsp); 1739 out: 1740 fsp->lp->tt.exch_done(seq); 1741 fc_frame_free(fp); 1742 } 1743 1744 /** 1745 * fc_fcp_srr_error() - Handler for SRR errors 1746 * @fsp: The FCP packet that the SRR error is on 1747 * @fp: The SRR frame 1748 */ 1749 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1750 { 1751 if (fc_fcp_lock_pkt(fsp)) 1752 goto out; 1753 switch (PTR_ERR(fp)) { 1754 case -FC_EX_TIMEOUT: 1755 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1756 fc_fcp_rec(fsp); 1757 else 1758 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1759 break; 1760 case -FC_EX_CLOSED: /* e.g., link failure */ 1761 /* fall through */ 1762 default: 1763 fc_fcp_retry_cmd(fsp); 1764 break; 1765 } 1766 fc_fcp_unlock_pkt(fsp); 1767 out: 1768 fsp->lp->tt.exch_done(fsp->recov_seq); 1769 } 1770 1771 /** 1772 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1773 * @lport: The local port to be checked 1774 */ 1775 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1776 { 1777 /* lock ? */ 1778 return (lport->state == LPORT_ST_READY) && 1779 lport->link_up && !lport->qfull; 1780 } 1781 1782 /** 1783 * fc_queuecommand() - The queuecommand function of the SCSI template 1784 * @shost: The Scsi_Host that the command was issued to 1785 * @cmd: The scsi_cmnd to be executed 1786 * 1787 * This is the i/o strategy routine, called by the SCSI layer. 1788 */ 1789 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1790 { 1791 struct fc_lport *lport = shost_priv(shost); 1792 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1793 struct fc_fcp_pkt *fsp; 1794 struct fc_rport_libfc_priv *rpriv; 1795 int rval; 1796 int rc = 0; 1797 struct fc_stats *stats; 1798 1799 rval = fc_remote_port_chkready(rport); 1800 if (rval) { 1801 sc_cmd->result = rval; 1802 sc_cmd->scsi_done(sc_cmd); 1803 return 0; 1804 } 1805 1806 if (!*(struct fc_remote_port **)rport->dd_data) { 1807 /* 1808 * rport is transitioning from blocked/deleted to 1809 * online 1810 */ 1811 sc_cmd->result = DID_IMM_RETRY << 16; 1812 sc_cmd->scsi_done(sc_cmd); 1813 goto out; 1814 } 1815 1816 rpriv = rport->dd_data; 1817 1818 if (!fc_fcp_lport_queue_ready(lport)) { 1819 if (lport->qfull) 1820 fc_fcp_can_queue_ramp_down(lport); 1821 rc = SCSI_MLQUEUE_HOST_BUSY; 1822 goto out; 1823 } 1824 1825 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1826 if (fsp == NULL) { 1827 rc = SCSI_MLQUEUE_HOST_BUSY; 1828 goto out; 1829 } 1830 1831 /* 1832 * build the libfc request pkt 1833 */ 1834 fsp->cmd = sc_cmd; /* save the cmd */ 1835 fsp->rport = rport; /* set the remote port ptr */ 1836 1837 /* 1838 * set up the transfer length 1839 */ 1840 fsp->data_len = scsi_bufflen(sc_cmd); 1841 fsp->xfer_len = 0; 1842 1843 /* 1844 * setup the data direction 1845 */ 1846 stats = per_cpu_ptr(lport->stats, get_cpu()); 1847 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1848 fsp->req_flags = FC_SRB_READ; 1849 stats->InputRequests++; 1850 stats->InputBytes += fsp->data_len; 1851 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1852 fsp->req_flags = FC_SRB_WRITE; 1853 stats->OutputRequests++; 1854 stats->OutputBytes += fsp->data_len; 1855 } else { 1856 fsp->req_flags = 0; 1857 stats->ControlRequests++; 1858 } 1859 put_cpu(); 1860 1861 /* 1862 * send it to the lower layer 1863 * if we get -1 return then put the request in the pending 1864 * queue. 1865 */ 1866 rval = fc_fcp_pkt_send(lport, fsp); 1867 if (rval != 0) { 1868 fsp->state = FC_SRB_FREE; 1869 fc_fcp_pkt_release(fsp); 1870 rc = SCSI_MLQUEUE_HOST_BUSY; 1871 } 1872 out: 1873 return rc; 1874 } 1875 EXPORT_SYMBOL(fc_queuecommand); 1876 1877 /** 1878 * fc_io_compl() - Handle responses for completed commands 1879 * @fsp: The FCP packet that is complete 1880 * 1881 * Translates fcp_pkt errors to a Linux SCSI errors. 1882 * The fcp packet lock must be held when calling. 1883 */ 1884 static void fc_io_compl(struct fc_fcp_pkt *fsp) 1885 { 1886 struct fc_fcp_internal *si; 1887 struct scsi_cmnd *sc_cmd; 1888 struct fc_lport *lport; 1889 unsigned long flags; 1890 1891 /* release outstanding ddp context */ 1892 fc_fcp_ddp_done(fsp); 1893 1894 fsp->state |= FC_SRB_COMPL; 1895 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1896 spin_unlock_bh(&fsp->scsi_pkt_lock); 1897 del_timer_sync(&fsp->timer); 1898 spin_lock_bh(&fsp->scsi_pkt_lock); 1899 } 1900 1901 lport = fsp->lp; 1902 si = fc_get_scsi_internal(lport); 1903 1904 /* 1905 * if can_queue ramp down is done then try can_queue ramp up 1906 * since commands are completing now. 1907 */ 1908 if (si->last_can_queue_ramp_down_time) 1909 fc_fcp_can_queue_ramp_up(lport); 1910 1911 sc_cmd = fsp->cmd; 1912 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1913 switch (fsp->status_code) { 1914 case FC_COMPLETE: 1915 if (fsp->cdb_status == 0) { 1916 /* 1917 * good I/O status 1918 */ 1919 sc_cmd->result = DID_OK << 16; 1920 if (fsp->scsi_resid) 1921 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1922 } else { 1923 /* 1924 * transport level I/O was ok but scsi 1925 * has non zero status 1926 */ 1927 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 1928 } 1929 break; 1930 case FC_ERROR: 1931 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1932 "due to FC_ERROR\n"); 1933 sc_cmd->result = DID_ERROR << 16; 1934 break; 1935 case FC_DATA_UNDRUN: 1936 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 1937 /* 1938 * scsi status is good but transport level 1939 * underrun. 1940 */ 1941 if (fsp->state & FC_SRB_RCV_STATUS) { 1942 sc_cmd->result = DID_OK << 16; 1943 } else { 1944 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 1945 " due to FC_DATA_UNDRUN (trans)\n"); 1946 sc_cmd->result = DID_ERROR << 16; 1947 } 1948 } else { 1949 /* 1950 * scsi got underrun, this is an error 1951 */ 1952 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1953 "due to FC_DATA_UNDRUN (scsi)\n"); 1954 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 1955 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1956 } 1957 break; 1958 case FC_DATA_OVRRUN: 1959 /* 1960 * overrun is an error 1961 */ 1962 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1963 "due to FC_DATA_OVRRUN\n"); 1964 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 1965 break; 1966 case FC_CMD_ABORTED: 1967 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1968 "due to FC_CMD_ABORTED\n"); 1969 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; 1970 break; 1971 case FC_CMD_RESET: 1972 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 1973 "due to FC_CMD_RESET\n"); 1974 sc_cmd->result = (DID_RESET << 16); 1975 break; 1976 case FC_HRD_ERROR: 1977 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 1978 "due to FC_HRD_ERROR\n"); 1979 sc_cmd->result = (DID_NO_CONNECT << 16); 1980 break; 1981 case FC_CRC_ERROR: 1982 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 1983 "due to FC_CRC_ERROR\n"); 1984 sc_cmd->result = (DID_PARITY << 16); 1985 break; 1986 case FC_TIMED_OUT: 1987 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 1988 "due to FC_TIMED_OUT\n"); 1989 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 1990 break; 1991 default: 1992 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 1993 "due to unknown error\n"); 1994 sc_cmd->result = (DID_ERROR << 16); 1995 break; 1996 } 1997 1998 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 1999 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2000 2001 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2002 list_del(&fsp->list); 2003 sc_cmd->SCp.ptr = NULL; 2004 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2005 sc_cmd->scsi_done(sc_cmd); 2006 2007 /* release ref from initial allocation in queue command */ 2008 fc_fcp_pkt_release(fsp); 2009 } 2010 2011 /** 2012 * fc_eh_abort() - Abort a command 2013 * @sc_cmd: The SCSI command to abort 2014 * 2015 * From SCSI host template. 2016 * Send an ABTS to the target device and wait for the response. 2017 */ 2018 int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2019 { 2020 struct fc_fcp_pkt *fsp; 2021 struct fc_lport *lport; 2022 struct fc_fcp_internal *si; 2023 int rc = FAILED; 2024 unsigned long flags; 2025 int rval; 2026 2027 rval = fc_block_scsi_eh(sc_cmd); 2028 if (rval) 2029 return rval; 2030 2031 lport = shost_priv(sc_cmd->device->host); 2032 if (lport->state != LPORT_ST_READY) 2033 return rc; 2034 else if (!lport->link_up) 2035 return rc; 2036 2037 si = fc_get_scsi_internal(lport); 2038 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2039 fsp = CMD_SP(sc_cmd); 2040 if (!fsp) { 2041 /* command completed while scsi eh was setting up */ 2042 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2043 return SUCCESS; 2044 } 2045 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ 2046 fc_fcp_pkt_hold(fsp); 2047 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2048 2049 if (fc_fcp_lock_pkt(fsp)) { 2050 /* completed while we were waiting for timer to be deleted */ 2051 rc = SUCCESS; 2052 goto release_pkt; 2053 } 2054 2055 rc = fc_fcp_pkt_abort(fsp); 2056 fc_fcp_unlock_pkt(fsp); 2057 2058 release_pkt: 2059 fc_fcp_pkt_release(fsp); 2060 return rc; 2061 } 2062 EXPORT_SYMBOL(fc_eh_abort); 2063 2064 /** 2065 * fc_eh_device_reset() - Reset a single LUN 2066 * @sc_cmd: The SCSI command which identifies the device whose 2067 * LUN is to be reset 2068 * 2069 * Set from SCSI host template. 2070 */ 2071 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2072 { 2073 struct fc_lport *lport; 2074 struct fc_fcp_pkt *fsp; 2075 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2076 int rc = FAILED; 2077 int rval; 2078 2079 rval = fc_block_scsi_eh(sc_cmd); 2080 if (rval) 2081 return rval; 2082 2083 lport = shost_priv(sc_cmd->device->host); 2084 2085 if (lport->state != LPORT_ST_READY) 2086 return rc; 2087 2088 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2089 2090 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2091 if (fsp == NULL) { 2092 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2093 goto out; 2094 } 2095 2096 /* 2097 * Build the libfc request pkt. Do not set the scsi cmnd, because 2098 * the sc passed in is not setup for execution like when sent 2099 * through the queuecommand callout. 2100 */ 2101 fsp->rport = rport; /* set the remote port ptr */ 2102 2103 /* 2104 * flush outstanding commands 2105 */ 2106 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2107 fsp->state = FC_SRB_FREE; 2108 fc_fcp_pkt_release(fsp); 2109 2110 out: 2111 return rc; 2112 } 2113 EXPORT_SYMBOL(fc_eh_device_reset); 2114 2115 /** 2116 * fc_eh_host_reset() - Reset a Scsi_Host. 2117 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2118 */ 2119 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2120 { 2121 struct Scsi_Host *shost = sc_cmd->device->host; 2122 struct fc_lport *lport = shost_priv(shost); 2123 unsigned long wait_tmo; 2124 2125 FC_SCSI_DBG(lport, "Resetting host\n"); 2126 2127 fc_block_scsi_eh(sc_cmd); 2128 2129 lport->tt.lport_reset(lport); 2130 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2131 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2132 wait_tmo)) 2133 msleep(1000); 2134 2135 if (fc_fcp_lport_queue_ready(lport)) { 2136 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2137 "on port (%6.6x)\n", lport->port_id); 2138 return SUCCESS; 2139 } else { 2140 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2141 "port (%6.6x) is not ready.\n", 2142 lport->port_id); 2143 return FAILED; 2144 } 2145 } 2146 EXPORT_SYMBOL(fc_eh_host_reset); 2147 2148 /** 2149 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2150 * @sdev: The SCSI device that identifies the SCSI host 2151 * 2152 * Configures queue depth based on host's cmd_per_len. If not set 2153 * then we use the libfc default. 2154 */ 2155 int fc_slave_alloc(struct scsi_device *sdev) 2156 { 2157 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2158 2159 if (!rport || fc_remote_port_chkready(rport)) 2160 return -ENXIO; 2161 2162 if (sdev->tagged_supported) 2163 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2164 else 2165 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), 2166 FC_FCP_DFLT_QUEUE_DEPTH); 2167 2168 return 0; 2169 } 2170 EXPORT_SYMBOL(fc_slave_alloc); 2171 2172 /** 2173 * fc_change_queue_depth() - Change a device's queue depth 2174 * @sdev: The SCSI device whose queue depth is to change 2175 * @qdepth: The new queue depth 2176 * @reason: The resason for the change 2177 */ 2178 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) 2179 { 2180 switch (reason) { 2181 case SCSI_QDEPTH_DEFAULT: 2182 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2183 break; 2184 case SCSI_QDEPTH_QFULL: 2185 scsi_track_queue_full(sdev, qdepth); 2186 break; 2187 case SCSI_QDEPTH_RAMP_UP: 2188 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); 2189 break; 2190 default: 2191 return -EOPNOTSUPP; 2192 } 2193 return sdev->queue_depth; 2194 } 2195 EXPORT_SYMBOL(fc_change_queue_depth); 2196 2197 /** 2198 * fc_change_queue_type() - Change a device's queue type 2199 * @sdev: The SCSI device whose queue depth is to change 2200 * @tag_type: Identifier for queue type 2201 */ 2202 int fc_change_queue_type(struct scsi_device *sdev, int tag_type) 2203 { 2204 if (sdev->tagged_supported) { 2205 scsi_set_tag_type(sdev, tag_type); 2206 if (tag_type) 2207 scsi_activate_tcq(sdev, sdev->queue_depth); 2208 else 2209 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2210 } else 2211 tag_type = 0; 2212 2213 return tag_type; 2214 } 2215 EXPORT_SYMBOL(fc_change_queue_type); 2216 2217 /** 2218 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2219 * @lport: The local port that no longer needs the FCP layer 2220 */ 2221 void fc_fcp_destroy(struct fc_lport *lport) 2222 { 2223 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2224 2225 if (!list_empty(&si->scsi_pkt_queue)) 2226 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2227 "port (%6.6x)\n", lport->port_id); 2228 2229 mempool_destroy(si->scsi_pkt_pool); 2230 kfree(si); 2231 lport->scsi_priv = NULL; 2232 } 2233 EXPORT_SYMBOL(fc_fcp_destroy); 2234 2235 int fc_setup_fcp(void) 2236 { 2237 int rc = 0; 2238 2239 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2240 sizeof(struct fc_fcp_pkt), 2241 0, SLAB_HWCACHE_ALIGN, NULL); 2242 if (!scsi_pkt_cachep) { 2243 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2244 "module load failed!"); 2245 rc = -ENOMEM; 2246 } 2247 2248 return rc; 2249 } 2250 2251 void fc_destroy_fcp(void) 2252 { 2253 if (scsi_pkt_cachep) 2254 kmem_cache_destroy(scsi_pkt_cachep); 2255 } 2256 2257 /** 2258 * fc_fcp_init() - Initialize the FCP layer for a local port 2259 * @lport: The local port to initialize the exchange layer for 2260 */ 2261 int fc_fcp_init(struct fc_lport *lport) 2262 { 2263 int rc; 2264 struct fc_fcp_internal *si; 2265 2266 if (!lport->tt.fcp_cmd_send) 2267 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2268 2269 if (!lport->tt.fcp_cleanup) 2270 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2271 2272 if (!lport->tt.fcp_abort_io) 2273 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2274 2275 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2276 if (!si) 2277 return -ENOMEM; 2278 lport->scsi_priv = si; 2279 si->max_can_queue = lport->host->can_queue; 2280 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2281 spin_lock_init(&si->scsi_queue_lock); 2282 2283 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2284 if (!si->scsi_pkt_pool) { 2285 rc = -ENOMEM; 2286 goto free_internal; 2287 } 2288 return 0; 2289 2290 free_internal: 2291 kfree(si); 2292 return rc; 2293 } 2294 EXPORT_SYMBOL(fc_fcp_init); 2295