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 #define FC_TRANS_RESET 12 126 127 /* 128 * Error recovery timeout values. 129 */ 130 #define FC_SCSI_TM_TOV (10 * HZ) 131 #define FC_HOST_RESET_TIMEOUT (30 * HZ) 132 #define FC_CAN_QUEUE_PERIOD (60 * HZ) 133 134 #define FC_MAX_ERROR_CNT 5 135 #define FC_MAX_RECOV_RETRY 3 136 137 #define FC_FCP_DFLT_QUEUE_DEPTH 32 138 139 /** 140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 141 * @lport: The local port that the FCP packet is for 142 * @gfp: GFP flags for allocation 143 * 144 * Return value: fcp_pkt structure or null on allocation failure. 145 * Context: Can be called from process context, no lock is required. 146 */ 147 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 148 { 149 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 150 struct fc_fcp_pkt *fsp; 151 152 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 153 if (fsp) { 154 memset(fsp, 0, sizeof(*fsp)); 155 fsp->lp = lport; 156 fsp->xfer_ddp = FC_XID_UNKNOWN; 157 refcount_set(&fsp->ref_cnt, 1); 158 init_timer(&fsp->timer); 159 fsp->timer.data = (unsigned long)fsp; 160 INIT_LIST_HEAD(&fsp->list); 161 spin_lock_init(&fsp->scsi_pkt_lock); 162 } else { 163 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; 164 put_cpu(); 165 } 166 return fsp; 167 } 168 169 /** 170 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 171 * @fsp: The FCP packet to be released 172 * 173 * Context: Can be called from process or interrupt context, 174 * no lock is required. 175 */ 176 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 177 { 178 if (refcount_dec_and_test(&fsp->ref_cnt)) { 179 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 180 181 mempool_free(fsp, si->scsi_pkt_pool); 182 } 183 } 184 185 /** 186 * fc_fcp_pkt_hold() - Hold a fcp_pkt 187 * @fsp: The FCP packet to be held 188 */ 189 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 190 { 191 refcount_inc(&fsp->ref_cnt); 192 } 193 194 /** 195 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt 196 * @seq: The sequence that the FCP packet is on (required by destructor API) 197 * @fsp: The FCP packet to be released 198 * 199 * This routine is called by a destructor callback in the fc_exch_seq_send() 200 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 201 * argument even though it is not used by this routine. 202 * 203 * Context: No locking required. 204 */ 205 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 206 { 207 fc_fcp_pkt_release(fsp); 208 } 209 210 /** 211 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 212 * @fsp: The FCP packet to be locked and incremented 213 * 214 * We should only return error if we return a command to SCSI-ml before 215 * getting a response. This can happen in cases where we send a abort, but 216 * do not wait for the response and the abort and command can be passing 217 * each other on the wire/network-layer. 218 * 219 * Note: this function locks the packet and gets a reference to allow 220 * callers to call the completion function while the lock is held and 221 * not have to worry about the packets refcount. 222 * 223 * TODO: Maybe we should just have callers grab/release the lock and 224 * have a function that they call to verify the fsp and grab a ref if 225 * needed. 226 */ 227 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 228 { 229 spin_lock_bh(&fsp->scsi_pkt_lock); 230 if (fsp->state & FC_SRB_COMPL) { 231 spin_unlock_bh(&fsp->scsi_pkt_lock); 232 return -EPERM; 233 } 234 235 fc_fcp_pkt_hold(fsp); 236 return 0; 237 } 238 239 /** 240 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 241 * reference count 242 * @fsp: The FCP packet to be unlocked and decremented 243 */ 244 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 245 { 246 spin_unlock_bh(&fsp->scsi_pkt_lock); 247 fc_fcp_pkt_release(fsp); 248 } 249 250 /** 251 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 252 * @fsp: The FCP packet to start a timer for 253 * @delay: The timeout period in jiffies 254 */ 255 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 256 { 257 if (!(fsp->state & FC_SRB_COMPL)) { 258 mod_timer(&fsp->timer, jiffies + delay); 259 fsp->timer_delay = delay; 260 } 261 } 262 263 static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp) 264 { 265 fsp->state |= FC_SRB_ABORTED; 266 fsp->state &= ~FC_SRB_ABORT_PENDING; 267 268 if (fsp->wait_for_comp) 269 complete(&fsp->tm_done); 270 else 271 fc_fcp_complete_locked(fsp); 272 } 273 274 /** 275 * fc_fcp_send_abort() - Send an abort for exchanges associated with a 276 * fcp_pkt 277 * @fsp: The FCP packet to abort exchanges on 278 */ 279 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 280 { 281 int rc; 282 283 if (!fsp->seq_ptr) 284 return -EINVAL; 285 286 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; 287 put_cpu(); 288 289 fsp->state |= FC_SRB_ABORT_PENDING; 290 rc = fc_seq_exch_abort(fsp->seq_ptr, 0); 291 /* 292 * fc_seq_exch_abort() might return -ENXIO if 293 * the sequence is already completed 294 */ 295 if (rc == -ENXIO) { 296 fc_fcp_abort_done(fsp); 297 rc = 0; 298 } 299 return rc; 300 } 301 302 /** 303 * fc_fcp_retry_cmd() - Retry a fcp_pkt 304 * @fsp: The FCP packet to be retried 305 * 306 * Sets the status code to be FC_ERROR and then calls 307 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 308 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 309 * The SCSI-ml will retry the command. 310 */ 311 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code) 312 { 313 if (fsp->seq_ptr) { 314 fc_exch_done(fsp->seq_ptr); 315 fsp->seq_ptr = NULL; 316 } 317 318 fsp->state &= ~FC_SRB_ABORT_PENDING; 319 fsp->io_status = 0; 320 fsp->status_code = status_code; 321 fc_fcp_complete_locked(fsp); 322 } 323 324 /** 325 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 326 * @fsp: The FCP packet that will manage the DDP frames 327 * @xid: The XID that will be used for the DDP exchange 328 */ 329 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 330 { 331 struct fc_lport *lport; 332 333 lport = fsp->lp; 334 if ((fsp->req_flags & FC_SRB_READ) && 335 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 336 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 337 scsi_sg_count(fsp->cmd))) 338 fsp->xfer_ddp = xid; 339 } 340 } 341 342 /** 343 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 344 * DDP related resources for a fcp_pkt 345 * @fsp: The FCP packet that DDP had been used on 346 */ 347 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 348 { 349 struct fc_lport *lport; 350 351 if (!fsp) 352 return; 353 354 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 355 return; 356 357 lport = fsp->lp; 358 if (lport->tt.ddp_done) { 359 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 360 fsp->xfer_ddp = FC_XID_UNKNOWN; 361 } 362 } 363 364 /** 365 * fc_fcp_can_queue_ramp_up() - increases can_queue 366 * @lport: lport to ramp up can_queue 367 */ 368 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 369 { 370 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 371 unsigned long flags; 372 int can_queue; 373 374 spin_lock_irqsave(lport->host->host_lock, flags); 375 376 if (si->last_can_queue_ramp_up_time && 377 (time_before(jiffies, si->last_can_queue_ramp_up_time + 378 FC_CAN_QUEUE_PERIOD))) 379 goto unlock; 380 381 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 382 FC_CAN_QUEUE_PERIOD)) 383 goto unlock; 384 385 si->last_can_queue_ramp_up_time = jiffies; 386 387 can_queue = lport->host->can_queue << 1; 388 if (can_queue >= si->max_can_queue) { 389 can_queue = si->max_can_queue; 390 si->last_can_queue_ramp_down_time = 0; 391 } 392 lport->host->can_queue = can_queue; 393 shost_printk(KERN_ERR, lport->host, "libfc: increased " 394 "can_queue to %d.\n", can_queue); 395 396 unlock: 397 spin_unlock_irqrestore(lport->host->host_lock, flags); 398 } 399 400 /** 401 * fc_fcp_can_queue_ramp_down() - reduces can_queue 402 * @lport: lport to reduce can_queue 403 * 404 * If we are getting memory allocation failures, then we may 405 * be trying to execute too many commands. We let the running 406 * commands complete or timeout, then try again with a reduced 407 * can_queue. Eventually we will hit the point where we run 408 * on all reserved structs. 409 */ 410 static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 411 { 412 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 413 unsigned long flags; 414 int can_queue; 415 bool changed = false; 416 417 spin_lock_irqsave(lport->host->host_lock, flags); 418 419 if (si->last_can_queue_ramp_down_time && 420 (time_before(jiffies, si->last_can_queue_ramp_down_time + 421 FC_CAN_QUEUE_PERIOD))) 422 goto unlock; 423 424 si->last_can_queue_ramp_down_time = jiffies; 425 426 can_queue = lport->host->can_queue; 427 can_queue >>= 1; 428 if (!can_queue) 429 can_queue = 1; 430 lport->host->can_queue = can_queue; 431 changed = true; 432 433 unlock: 434 spin_unlock_irqrestore(lport->host->host_lock, flags); 435 return changed; 436 } 437 438 /* 439 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 440 * @lport: fc lport struct 441 * @len: payload length 442 * 443 * Allocates fc_frame structure and buffer but if fails to allocate 444 * then reduce can_queue. 445 */ 446 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 447 size_t len) 448 { 449 struct fc_frame *fp; 450 451 fp = fc_frame_alloc(lport, len); 452 if (likely(fp)) 453 return fp; 454 455 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; 456 put_cpu(); 457 /* error case */ 458 fc_fcp_can_queue_ramp_down(lport); 459 shost_printk(KERN_ERR, lport->host, 460 "libfc: Could not allocate frame, " 461 "reducing can_queue to %d.\n", lport->host->can_queue); 462 return NULL; 463 } 464 465 /** 466 * get_fsp_rec_tov() - Helper function to get REC_TOV 467 * @fsp: the FCP packet 468 * 469 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 470 */ 471 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 472 { 473 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 474 unsigned int e_d_tov = FC_DEF_E_D_TOV; 475 476 if (rpriv && rpriv->e_d_tov > e_d_tov) 477 e_d_tov = rpriv->e_d_tov; 478 return msecs_to_jiffies(e_d_tov) + HZ; 479 } 480 481 /** 482 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 483 * @fsp: The FCP packet the data is on 484 * @fp: The data frame 485 */ 486 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 487 { 488 struct scsi_cmnd *sc = fsp->cmd; 489 struct fc_lport *lport = fsp->lp; 490 struct fc_stats *stats; 491 struct fc_frame_header *fh; 492 size_t start_offset; 493 size_t offset; 494 u32 crc; 495 u32 copy_len = 0; 496 size_t len; 497 void *buf; 498 struct scatterlist *sg; 499 u32 nents; 500 u8 host_bcode = FC_COMPLETE; 501 502 fh = fc_frame_header_get(fp); 503 offset = ntohl(fh->fh_parm_offset); 504 start_offset = offset; 505 len = fr_len(fp) - sizeof(*fh); 506 buf = fc_frame_payload_get(fp, 0); 507 508 /* 509 * if this I/O is ddped then clear it and initiate recovery since data 510 * frames are expected to be placed directly in that case. 511 * 512 * Indicate error to scsi-ml because something went wrong with the 513 * ddp handling to get us here. 514 */ 515 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 516 fc_fcp_ddp_done(fsp); 517 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 518 host_bcode = FC_ERROR; 519 goto err; 520 } 521 if (offset + len > fsp->data_len) { 522 /* this should never happen */ 523 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 524 fc_frame_crc_check(fp)) 525 goto crc_err; 526 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 527 "data_len %x\n", len, offset, fsp->data_len); 528 529 /* Data is corrupted indicate scsi-ml should retry */ 530 host_bcode = FC_DATA_OVRRUN; 531 goto err; 532 } 533 if (offset != fsp->xfer_len) 534 fsp->state |= FC_SRB_DISCONTIG; 535 536 sg = scsi_sglist(sc); 537 nents = scsi_sg_count(sc); 538 539 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 540 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 541 &offset, NULL); 542 } else { 543 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 544 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 545 &offset, &crc); 546 buf = fc_frame_payload_get(fp, 0); 547 if (len % 4) 548 crc = crc32(crc, buf + len, 4 - (len % 4)); 549 550 if (~crc != le32_to_cpu(fr_crc(fp))) { 551 crc_err: 552 stats = per_cpu_ptr(lport->stats, get_cpu()); 553 stats->ErrorFrames++; 554 /* per cpu count, not total count, but OK for limit */ 555 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) 556 printk(KERN_WARNING "libfc: CRC error on data " 557 "frame for port (%6.6x)\n", 558 lport->port_id); 559 put_cpu(); 560 /* 561 * Assume the frame is total garbage. 562 * We may have copied it over the good part 563 * of the buffer. 564 * If so, we need to retry the entire operation. 565 * Otherwise, ignore it. 566 */ 567 if (fsp->state & FC_SRB_DISCONTIG) { 568 host_bcode = FC_CRC_ERROR; 569 goto err; 570 } 571 return; 572 } 573 } 574 575 if (fsp->xfer_contig_end == start_offset) 576 fsp->xfer_contig_end += copy_len; 577 fsp->xfer_len += copy_len; 578 579 /* 580 * In the very rare event that this data arrived after the response 581 * and completes the transfer, call the completion handler. 582 */ 583 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 584 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) { 585 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" ); 586 fc_fcp_complete_locked(fsp); 587 } 588 return; 589 err: 590 fc_fcp_recovery(fsp, host_bcode); 591 } 592 593 /** 594 * fc_fcp_send_data() - Send SCSI data to a target 595 * @fsp: The FCP packet the data is on 596 * @sp: The sequence the data is to be sent on 597 * @offset: The starting offset for this data request 598 * @seq_blen: The burst length for this data request 599 * 600 * Called after receiving a Transfer Ready data descriptor. 601 * If the LLD is capable of sequence offload then send down the 602 * seq_blen amount of data in single frame, otherwise send 603 * multiple frames of the maximum frame payload supported by 604 * the target port. 605 */ 606 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 607 size_t offset, size_t seq_blen) 608 { 609 struct fc_exch *ep; 610 struct scsi_cmnd *sc; 611 struct scatterlist *sg; 612 struct fc_frame *fp = NULL; 613 struct fc_lport *lport = fsp->lp; 614 struct page *page; 615 size_t remaining; 616 size_t t_blen; 617 size_t tlen; 618 size_t sg_bytes; 619 size_t frame_offset, fh_parm_offset; 620 size_t off; 621 int error; 622 void *data = NULL; 623 void *page_addr; 624 int using_sg = lport->sg_supp; 625 u32 f_ctl; 626 627 WARN_ON(seq_blen <= 0); 628 if (unlikely(offset + seq_blen > fsp->data_len)) { 629 /* this should never happen */ 630 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 631 "offset %zx\n", seq_blen, offset); 632 fc_fcp_send_abort(fsp); 633 return 0; 634 } else if (offset != fsp->xfer_len) { 635 /* Out of Order Data Request - no problem, but unexpected. */ 636 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 637 "seq_blen %zx offset %zx\n", seq_blen, offset); 638 } 639 640 /* 641 * if LLD is capable of seq_offload then set transport 642 * burst length (t_blen) to seq_blen, otherwise set t_blen 643 * to max FC frame payload previously set in fsp->max_payload. 644 */ 645 t_blen = fsp->max_payload; 646 if (lport->seq_offload) { 647 t_blen = min(seq_blen, (size_t)lport->lso_max); 648 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 649 fsp, seq_blen, lport->lso_max, t_blen); 650 } 651 652 if (t_blen > 512) 653 t_blen &= ~(512 - 1); /* round down to block size */ 654 sc = fsp->cmd; 655 656 remaining = seq_blen; 657 fh_parm_offset = frame_offset = offset; 658 tlen = 0; 659 seq = fc_seq_start_next(seq); 660 f_ctl = FC_FC_REL_OFF; 661 WARN_ON(!seq); 662 663 sg = scsi_sglist(sc); 664 665 while (remaining > 0 && sg) { 666 if (offset >= sg->length) { 667 offset -= sg->length; 668 sg = sg_next(sg); 669 continue; 670 } 671 if (!fp) { 672 tlen = min(t_blen, remaining); 673 674 /* 675 * TODO. Temporary workaround. fc_seq_send() can't 676 * handle odd lengths in non-linear skbs. 677 * This will be the final fragment only. 678 */ 679 if (tlen % 4) 680 using_sg = 0; 681 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 682 if (!fp) 683 return -ENOMEM; 684 685 data = fc_frame_header_get(fp) + 1; 686 fh_parm_offset = frame_offset; 687 fr_max_payload(fp) = fsp->max_payload; 688 } 689 690 off = offset + sg->offset; 691 sg_bytes = min(tlen, sg->length - offset); 692 sg_bytes = min(sg_bytes, 693 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 694 page = sg_page(sg) + (off >> PAGE_SHIFT); 695 if (using_sg) { 696 get_page(page); 697 skb_fill_page_desc(fp_skb(fp), 698 skb_shinfo(fp_skb(fp))->nr_frags, 699 page, off & ~PAGE_MASK, sg_bytes); 700 fp_skb(fp)->data_len += sg_bytes; 701 fr_len(fp) += sg_bytes; 702 fp_skb(fp)->truesize += PAGE_SIZE; 703 } else { 704 /* 705 * The scatterlist item may be bigger than PAGE_SIZE, 706 * but we must not cross pages inside the kmap. 707 */ 708 page_addr = kmap_atomic(page); 709 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 710 sg_bytes); 711 kunmap_atomic(page_addr); 712 data += sg_bytes; 713 } 714 offset += sg_bytes; 715 frame_offset += sg_bytes; 716 tlen -= sg_bytes; 717 remaining -= sg_bytes; 718 719 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 720 (tlen)) 721 continue; 722 723 /* 724 * Send sequence with transfer sequence initiative in case 725 * this is last FCP frame of the sequence. 726 */ 727 if (remaining == 0) 728 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 729 730 ep = fc_seq_exch(seq); 731 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 732 FC_TYPE_FCP, f_ctl, fh_parm_offset); 733 734 /* 735 * send fragment using for a sequence. 736 */ 737 error = fc_seq_send(lport, seq, fp); 738 if (error) { 739 WARN_ON(1); /* send error should be rare */ 740 return error; 741 } 742 fp = NULL; 743 } 744 fsp->xfer_len += seq_blen; /* premature count? */ 745 return 0; 746 } 747 748 /** 749 * fc_fcp_abts_resp() - Receive an ABTS response 750 * @fsp: The FCP packet that is being aborted 751 * @fp: The response frame 752 */ 753 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 754 { 755 int ba_done = 1; 756 struct fc_ba_rjt *brp; 757 struct fc_frame_header *fh; 758 759 fh = fc_frame_header_get(fp); 760 switch (fh->fh_r_ctl) { 761 case FC_RCTL_BA_ACC: 762 break; 763 case FC_RCTL_BA_RJT: 764 brp = fc_frame_payload_get(fp, sizeof(*brp)); 765 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 766 break; 767 /* fall thru */ 768 default: 769 /* 770 * we will let the command timeout 771 * and scsi-ml recover in this case, 772 * therefore cleared the ba_done flag. 773 */ 774 ba_done = 0; 775 } 776 777 if (ba_done) 778 fc_fcp_abort_done(fsp); 779 } 780 781 /** 782 * fc_fcp_recv() - Receive an FCP frame 783 * @seq: The sequence the frame is on 784 * @fp: The received frame 785 * @arg: The related FCP packet 786 * 787 * Context: Called from Soft IRQ context. Can not be called 788 * holding the FCP packet list lock. 789 */ 790 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 791 { 792 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 793 struct fc_lport *lport = fsp->lp; 794 struct fc_frame_header *fh; 795 struct fcp_txrdy *dd; 796 u8 r_ctl; 797 int rc = 0; 798 799 if (IS_ERR(fp)) { 800 fc_fcp_error(fsp, fp); 801 return; 802 } 803 804 fh = fc_frame_header_get(fp); 805 r_ctl = fh->fh_r_ctl; 806 807 if (lport->state != LPORT_ST_READY) { 808 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n", 809 lport->state, r_ctl); 810 goto out; 811 } 812 if (fc_fcp_lock_pkt(fsp)) 813 goto out; 814 815 if (fh->fh_type == FC_TYPE_BLS) { 816 fc_fcp_abts_resp(fsp, fp); 817 goto unlock; 818 } 819 820 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) { 821 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl); 822 goto unlock; 823 } 824 825 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 826 /* 827 * received XFER RDY from the target 828 * need to send data to the target 829 */ 830 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 831 dd = fc_frame_payload_get(fp, sizeof(*dd)); 832 WARN_ON(!dd); 833 834 rc = fc_fcp_send_data(fsp, seq, 835 (size_t) ntohl(dd->ft_data_ro), 836 (size_t) ntohl(dd->ft_burst_len)); 837 if (!rc) 838 seq->rec_data = fsp->xfer_len; 839 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 840 /* 841 * received a DATA frame 842 * next we will copy the data to the system buffer 843 */ 844 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 845 fc_fcp_recv_data(fsp, fp); 846 seq->rec_data = fsp->xfer_contig_end; 847 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 848 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 849 850 fc_fcp_resp(fsp, fp); 851 } else { 852 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 853 } 854 unlock: 855 fc_fcp_unlock_pkt(fsp); 856 out: 857 fc_frame_free(fp); 858 } 859 860 /** 861 * fc_fcp_resp() - Handler for FCP responses 862 * @fsp: The FCP packet the response is for 863 * @fp: The response frame 864 */ 865 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 866 { 867 struct fc_frame_header *fh; 868 struct fcp_resp *fc_rp; 869 struct fcp_resp_ext *rp_ex; 870 struct fcp_resp_rsp_info *fc_rp_info; 871 u32 plen; 872 u32 expected_len; 873 u32 respl = 0; 874 u32 snsl = 0; 875 u8 flags = 0; 876 877 plen = fr_len(fp); 878 fh = (struct fc_frame_header *)fr_hdr(fp); 879 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 880 goto len_err; 881 plen -= sizeof(*fh); 882 fc_rp = (struct fcp_resp *)(fh + 1); 883 fsp->cdb_status = fc_rp->fr_status; 884 flags = fc_rp->fr_flags; 885 fsp->scsi_comp_flags = flags; 886 expected_len = fsp->data_len; 887 888 /* if ddp, update xfer len */ 889 fc_fcp_ddp_done(fsp); 890 891 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 892 rp_ex = (void *)(fc_rp + 1); 893 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 894 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 895 goto len_err; 896 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 897 if (flags & FCP_RSP_LEN_VAL) { 898 respl = ntohl(rp_ex->fr_rsp_len); 899 if ((respl != FCP_RESP_RSP_INFO_LEN4) && 900 (respl != FCP_RESP_RSP_INFO_LEN8)) 901 goto len_err; 902 if (fsp->wait_for_comp) { 903 /* Abuse cdb_status for rsp code */ 904 fsp->cdb_status = fc_rp_info->rsp_code; 905 complete(&fsp->tm_done); 906 /* 907 * tmfs will not have any scsi cmd so 908 * exit here 909 */ 910 return; 911 } 912 } 913 if (flags & FCP_SNS_LEN_VAL) { 914 snsl = ntohl(rp_ex->fr_sns_len); 915 if (snsl > SCSI_SENSE_BUFFERSIZE) 916 snsl = SCSI_SENSE_BUFFERSIZE; 917 memcpy(fsp->cmd->sense_buffer, 918 (char *)fc_rp_info + respl, snsl); 919 } 920 } 921 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 922 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 923 goto len_err; 924 if (flags & FCP_RESID_UNDER) { 925 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 926 /* 927 * The cmnd->underflow is the minimum number of 928 * bytes that must be transferred for this 929 * command. Provided a sense condition is not 930 * present, make sure the actual amount 931 * transferred is at least the underflow value 932 * or fail. 933 */ 934 if (!(flags & FCP_SNS_LEN_VAL) && 935 (fc_rp->fr_status == 0) && 936 (scsi_bufflen(fsp->cmd) - 937 fsp->scsi_resid) < fsp->cmd->underflow) 938 goto err; 939 expected_len -= fsp->scsi_resid; 940 } else { 941 fsp->status_code = FC_ERROR; 942 } 943 } 944 } 945 fsp->state |= FC_SRB_RCV_STATUS; 946 947 /* 948 * Check for missing or extra data frames. 949 */ 950 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && 951 fsp->xfer_len != expected_len)) { 952 if (fsp->xfer_len < expected_len) { 953 /* 954 * Some data may be queued locally, 955 * Wait a at least one jiffy to see if it is delivered. 956 * If this expires without data, we may do SRR. 957 */ 958 if (fsp->lp->qfull) { 959 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n", 960 fsp->rport->port_id); 961 return; 962 } 963 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun " 964 "len %x, data len %x\n", 965 fsp->rport->port_id, 966 fsp->xfer_len, expected_len, fsp->data_len); 967 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 968 return; 969 } 970 fsp->status_code = FC_DATA_OVRRUN; 971 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 972 "len %x, data len %x\n", 973 fsp->rport->port_id, 974 fsp->xfer_len, expected_len, fsp->data_len); 975 } 976 fc_fcp_complete_locked(fsp); 977 return; 978 979 len_err: 980 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 981 "snsl %u\n", flags, fr_len(fp), respl, snsl); 982 err: 983 fsp->status_code = FC_ERROR; 984 fc_fcp_complete_locked(fsp); 985 } 986 987 /** 988 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 989 * fcp_pkt lock held 990 * @fsp: The FCP packet to be completed 991 * 992 * This function may sleep if a timer is pending. The packet lock must be 993 * held, and the host lock must not be held. 994 */ 995 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 996 { 997 struct fc_lport *lport = fsp->lp; 998 struct fc_seq *seq; 999 struct fc_exch *ep; 1000 u32 f_ctl; 1001 1002 if (fsp->state & FC_SRB_ABORT_PENDING) 1003 return; 1004 1005 if (fsp->state & FC_SRB_ABORTED) { 1006 if (!fsp->status_code) 1007 fsp->status_code = FC_CMD_ABORTED; 1008 } else { 1009 /* 1010 * Test for transport underrun, independent of response 1011 * underrun status. 1012 */ 1013 if (fsp->cdb_status == SAM_STAT_GOOD && 1014 fsp->xfer_len < fsp->data_len && !fsp->io_status && 1015 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 1016 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 1017 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n", 1018 fsp->xfer_len, fsp->data_len); 1019 fsp->status_code = FC_DATA_UNDRUN; 1020 } 1021 } 1022 1023 seq = fsp->seq_ptr; 1024 if (seq) { 1025 fsp->seq_ptr = NULL; 1026 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 1027 struct fc_frame *conf_frame; 1028 struct fc_seq *csp; 1029 1030 csp = fc_seq_start_next(seq); 1031 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 1032 if (conf_frame) { 1033 f_ctl = FC_FC_SEQ_INIT; 1034 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 1035 ep = fc_seq_exch(seq); 1036 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 1037 ep->did, ep->sid, 1038 FC_TYPE_FCP, f_ctl, 0); 1039 fc_seq_send(lport, csp, conf_frame); 1040 } 1041 } 1042 fc_exch_done(seq); 1043 } 1044 /* 1045 * Some resets driven by SCSI are not I/Os and do not have 1046 * SCSI commands associated with the requests. We should not 1047 * call I/O completion if we do not have a SCSI command. 1048 */ 1049 if (fsp->cmd) 1050 fc_io_compl(fsp); 1051 } 1052 1053 /** 1054 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 1055 * @fsp: The FCP packet whose exchanges should be canceled 1056 * @error: The reason for the cancellation 1057 */ 1058 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 1059 { 1060 if (fsp->seq_ptr) { 1061 fc_exch_done(fsp->seq_ptr); 1062 fsp->seq_ptr = NULL; 1063 } 1064 fsp->status_code = error; 1065 } 1066 1067 /** 1068 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1069 * @lport: The local port whose exchanges should be canceled 1070 * @id: The target's ID 1071 * @lun: The LUN 1072 * @error: The reason for cancellation 1073 * 1074 * If lun or id is -1, they are ignored. 1075 */ 1076 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1077 unsigned int lun, int error) 1078 { 1079 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1080 struct fc_fcp_pkt *fsp; 1081 struct scsi_cmnd *sc_cmd; 1082 unsigned long flags; 1083 1084 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1085 restart: 1086 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1087 sc_cmd = fsp->cmd; 1088 if (id != -1 && scmd_id(sc_cmd) != id) 1089 continue; 1090 1091 if (lun != -1 && sc_cmd->device->lun != lun) 1092 continue; 1093 1094 fc_fcp_pkt_hold(fsp); 1095 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1096 1097 spin_lock_bh(&fsp->scsi_pkt_lock); 1098 if (!(fsp->state & FC_SRB_COMPL)) { 1099 fsp->state |= FC_SRB_COMPL; 1100 /* 1101 * TODO: dropping scsi_pkt_lock and then reacquiring 1102 * again around fc_fcp_cleanup_cmd() is required, 1103 * since fc_fcp_cleanup_cmd() calls into 1104 * fc_seq_set_resp() and that func preempts cpu using 1105 * schedule. May be schedule and related code should be 1106 * removed instead of unlocking here to avoid scheduling 1107 * while atomic bug. 1108 */ 1109 spin_unlock_bh(&fsp->scsi_pkt_lock); 1110 1111 fc_fcp_cleanup_cmd(fsp, error); 1112 1113 spin_lock_bh(&fsp->scsi_pkt_lock); 1114 fc_io_compl(fsp); 1115 } 1116 spin_unlock_bh(&fsp->scsi_pkt_lock); 1117 1118 fc_fcp_pkt_release(fsp); 1119 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1120 /* 1121 * while we dropped the lock multiple pkts could 1122 * have been released, so we have to start over. 1123 */ 1124 goto restart; 1125 } 1126 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1127 } 1128 1129 /** 1130 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1131 * @lport: The local port whose exchanges are to be aborted 1132 */ 1133 static void fc_fcp_abort_io(struct fc_lport *lport) 1134 { 1135 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1136 } 1137 1138 /** 1139 * fc_fcp_pkt_send() - Send a fcp_pkt 1140 * @lport: The local port to send the FCP packet on 1141 * @fsp: The FCP packet to send 1142 * 1143 * Return: Zero for success and -1 for failure 1144 * Locks: Called without locks held 1145 */ 1146 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1147 { 1148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1149 unsigned long flags; 1150 int rc; 1151 1152 fsp->cmd->SCp.ptr = (char *)fsp; 1153 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1154 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1155 1156 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1157 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1158 1159 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1160 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1161 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1162 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1163 if (unlikely(rc)) { 1164 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1165 fsp->cmd->SCp.ptr = NULL; 1166 list_del(&fsp->list); 1167 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1168 } 1169 1170 return rc; 1171 } 1172 1173 /** 1174 * fc_fcp_cmd_send() - Send a FCP command 1175 * @lport: The local port to send the command on 1176 * @fsp: The FCP packet the command is on 1177 * @resp: The handler for the response 1178 */ 1179 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1180 void (*resp)(struct fc_seq *, 1181 struct fc_frame *fp, 1182 void *arg)) 1183 { 1184 struct fc_frame *fp; 1185 struct fc_seq *seq; 1186 struct fc_rport *rport; 1187 struct fc_rport_libfc_priv *rpriv; 1188 const size_t len = sizeof(fsp->cdb_cmd); 1189 int rc = 0; 1190 1191 if (fc_fcp_lock_pkt(fsp)) 1192 return 0; 1193 1194 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1195 if (!fp) { 1196 rc = -1; 1197 goto unlock; 1198 } 1199 1200 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1201 fr_fsp(fp) = fsp; 1202 rport = fsp->rport; 1203 fsp->max_payload = rport->maxframe_size; 1204 rpriv = rport->dd_data; 1205 1206 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1207 rpriv->local_port->port_id, FC_TYPE_FCP, 1208 FC_FCTL_REQ, 0); 1209 1210 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0); 1211 if (!seq) { 1212 rc = -1; 1213 goto unlock; 1214 } 1215 fsp->seq_ptr = seq; 1216 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1217 1218 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1219 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1220 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1221 1222 unlock: 1223 fc_fcp_unlock_pkt(fsp); 1224 return rc; 1225 } 1226 1227 /** 1228 * fc_fcp_error() - Handler for FCP layer errors 1229 * @fsp: The FCP packet the error is on 1230 * @fp: The frame that has errored 1231 */ 1232 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1233 { 1234 int error = PTR_ERR(fp); 1235 1236 if (fc_fcp_lock_pkt(fsp)) 1237 return; 1238 1239 if (error == -FC_EX_CLOSED) { 1240 fc_fcp_retry_cmd(fsp, FC_ERROR); 1241 goto unlock; 1242 } 1243 1244 /* 1245 * clear abort pending, because the lower layer 1246 * decided to force completion. 1247 */ 1248 fsp->state &= ~FC_SRB_ABORT_PENDING; 1249 fsp->status_code = FC_CMD_PLOGO; 1250 fc_fcp_complete_locked(fsp); 1251 unlock: 1252 fc_fcp_unlock_pkt(fsp); 1253 } 1254 1255 /** 1256 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1257 * @fsp: The FCP packet to abort on 1258 * 1259 * Called to send an abort and then wait for abort completion 1260 */ 1261 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1262 { 1263 int rc = FAILED; 1264 unsigned long ticks_left; 1265 1266 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state); 1267 if (fc_fcp_send_abort(fsp)) { 1268 FC_FCP_DBG(fsp, "failed to send abort\n"); 1269 return FAILED; 1270 } 1271 1272 if (fsp->state & FC_SRB_ABORTED) { 1273 FC_FCP_DBG(fsp, "target abort cmd completed\n"); 1274 return SUCCESS; 1275 } 1276 1277 init_completion(&fsp->tm_done); 1278 fsp->wait_for_comp = 1; 1279 1280 spin_unlock_bh(&fsp->scsi_pkt_lock); 1281 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1282 FC_SCSI_TM_TOV); 1283 spin_lock_bh(&fsp->scsi_pkt_lock); 1284 fsp->wait_for_comp = 0; 1285 1286 if (!ticks_left) { 1287 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1288 } else if (fsp->state & FC_SRB_ABORTED) { 1289 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1290 rc = SUCCESS; 1291 fc_fcp_complete_locked(fsp); 1292 } 1293 1294 return rc; 1295 } 1296 1297 /** 1298 * fc_lun_reset_send() - Send LUN reset command 1299 * @data: The FCP packet that identifies the LUN to be reset 1300 */ 1301 static void fc_lun_reset_send(unsigned long data) 1302 { 1303 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1304 struct fc_lport *lport = fsp->lp; 1305 1306 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1307 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1308 return; 1309 if (fc_fcp_lock_pkt(fsp)) 1310 return; 1311 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); 1312 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1313 fc_fcp_unlock_pkt(fsp); 1314 } 1315 } 1316 1317 /** 1318 * fc_lun_reset() - Send a LUN RESET command to a device 1319 * and wait for the reply 1320 * @lport: The local port to sent the command on 1321 * @fsp: The FCP packet that identifies the LUN to be reset 1322 * @id: The SCSI command ID 1323 * @lun: The LUN ID to be reset 1324 */ 1325 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1326 unsigned int id, unsigned int lun) 1327 { 1328 int rc; 1329 1330 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1331 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1332 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1333 1334 fsp->wait_for_comp = 1; 1335 init_completion(&fsp->tm_done); 1336 1337 fc_lun_reset_send((unsigned long)fsp); 1338 1339 /* 1340 * wait for completion of reset 1341 * after that make sure all commands are terminated 1342 */ 1343 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1344 1345 spin_lock_bh(&fsp->scsi_pkt_lock); 1346 fsp->state |= FC_SRB_COMPL; 1347 spin_unlock_bh(&fsp->scsi_pkt_lock); 1348 1349 del_timer_sync(&fsp->timer); 1350 1351 spin_lock_bh(&fsp->scsi_pkt_lock); 1352 if (fsp->seq_ptr) { 1353 fc_exch_done(fsp->seq_ptr); 1354 fsp->seq_ptr = NULL; 1355 } 1356 fsp->wait_for_comp = 0; 1357 spin_unlock_bh(&fsp->scsi_pkt_lock); 1358 1359 if (!rc) { 1360 FC_SCSI_DBG(lport, "lun reset failed\n"); 1361 return FAILED; 1362 } 1363 1364 /* cdb_status holds the tmf's rsp code */ 1365 if (fsp->cdb_status != FCP_TMF_CMPL) 1366 return FAILED; 1367 1368 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1369 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1370 return SUCCESS; 1371 } 1372 1373 /** 1374 * fc_tm_done() - Task Management response handler 1375 * @seq: The sequence that the response is on 1376 * @fp: The response frame 1377 * @arg: The FCP packet the response is for 1378 */ 1379 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1380 { 1381 struct fc_fcp_pkt *fsp = arg; 1382 struct fc_frame_header *fh; 1383 1384 if (IS_ERR(fp)) { 1385 /* 1386 * If there is an error just let it timeout or wait 1387 * for TMF to be aborted if it timedout. 1388 * 1389 * scsi-eh will escalate for when either happens. 1390 */ 1391 return; 1392 } 1393 1394 if (fc_fcp_lock_pkt(fsp)) 1395 goto out; 1396 1397 /* 1398 * raced with eh timeout handler. 1399 */ 1400 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1401 goto out_unlock; 1402 1403 fh = fc_frame_header_get(fp); 1404 if (fh->fh_type != FC_TYPE_BLS) 1405 fc_fcp_resp(fsp, fp); 1406 fsp->seq_ptr = NULL; 1407 fc_exch_done(seq); 1408 out_unlock: 1409 fc_fcp_unlock_pkt(fsp); 1410 out: 1411 fc_frame_free(fp); 1412 } 1413 1414 /** 1415 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1416 * @lport: The local port to be cleaned up 1417 */ 1418 static void fc_fcp_cleanup(struct fc_lport *lport) 1419 { 1420 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1421 } 1422 1423 /** 1424 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1425 * @data: The FCP packet that has timed out 1426 * 1427 * If REC is supported then just issue it and return. The REC exchange will 1428 * complete or time out and recovery can continue at that point. Otherwise, 1429 * if the response has been received without all the data it has been 1430 * ER_TIMEOUT since the response was received. If the response has not been 1431 * received we see if data was received recently. If it has been then we 1432 * continue waiting, otherwise, we abort the command. 1433 */ 1434 static void fc_fcp_timeout(unsigned long data) 1435 { 1436 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; 1437 struct fc_rport *rport = fsp->rport; 1438 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1439 1440 if (fc_fcp_lock_pkt(fsp)) 1441 return; 1442 1443 if (fsp->cdb_cmd.fc_tm_flags) 1444 goto unlock; 1445 1446 if (fsp->lp->qfull) { 1447 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n", 1448 fsp->timer_delay); 1449 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); 1450 fc_fcp_timer_set(fsp, fsp->timer_delay); 1451 goto unlock; 1452 } 1453 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n", 1454 fsp->timer_delay, rpriv->flags, fsp->state); 1455 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1456 1457 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1458 fc_fcp_rec(fsp); 1459 else if (fsp->state & FC_SRB_RCV_STATUS) 1460 fc_fcp_complete_locked(fsp); 1461 else 1462 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1463 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1464 unlock: 1465 fc_fcp_unlock_pkt(fsp); 1466 } 1467 1468 /** 1469 * fc_fcp_rec() - Send a REC ELS request 1470 * @fsp: The FCP packet to send the REC request on 1471 */ 1472 static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1473 { 1474 struct fc_lport *lport; 1475 struct fc_frame *fp; 1476 struct fc_rport *rport; 1477 struct fc_rport_libfc_priv *rpriv; 1478 1479 lport = fsp->lp; 1480 rport = fsp->rport; 1481 rpriv = rport->dd_data; 1482 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1483 fsp->status_code = FC_HRD_ERROR; 1484 fsp->io_status = 0; 1485 fc_fcp_complete_locked(fsp); 1486 return; 1487 } 1488 1489 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1490 if (!fp) 1491 goto retry; 1492 1493 fr_seq(fp) = fsp->seq_ptr; 1494 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1495 rpriv->local_port->port_id, FC_TYPE_ELS, 1496 FC_FCTL_REQ, 0); 1497 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1498 fc_fcp_rec_resp, fsp, 1499 2 * lport->r_a_tov)) { 1500 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1501 return; 1502 } 1503 retry: 1504 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1505 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1506 else 1507 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1508 } 1509 1510 /** 1511 * fc_fcp_rec_resp() - Handler for REC ELS responses 1512 * @seq: The sequence the response is on 1513 * @fp: The response frame 1514 * @arg: The FCP packet the response is on 1515 * 1516 * If the response is a reject then the scsi layer will handle 1517 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1518 * set the timeout and return. If the I/O was completed then complete the 1519 * exchange and tell the SCSI layer. 1520 */ 1521 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1522 { 1523 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1524 struct fc_els_rec_acc *recp; 1525 struct fc_els_ls_rjt *rjt; 1526 u32 e_stat; 1527 u8 opcode; 1528 u32 offset; 1529 enum dma_data_direction data_dir; 1530 enum fc_rctl r_ctl; 1531 struct fc_rport_libfc_priv *rpriv; 1532 1533 if (IS_ERR(fp)) { 1534 fc_fcp_rec_error(fsp, fp); 1535 return; 1536 } 1537 1538 if (fc_fcp_lock_pkt(fsp)) 1539 goto out; 1540 1541 fsp->recov_retry = 0; 1542 opcode = fc_frame_payload_op(fp); 1543 if (opcode == ELS_LS_RJT) { 1544 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1545 switch (rjt->er_reason) { 1546 default: 1547 FC_FCP_DBG(fsp, 1548 "device %x invalid REC reject %d/%d\n", 1549 fsp->rport->port_id, rjt->er_reason, 1550 rjt->er_explan); 1551 /* fall through */ 1552 case ELS_RJT_UNSUP: 1553 FC_FCP_DBG(fsp, "device does not support REC\n"); 1554 rpriv = fsp->rport->dd_data; 1555 /* 1556 * if we do not spport RECs or got some bogus 1557 * reason then resetup timer so we check for 1558 * making progress. 1559 */ 1560 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1561 break; 1562 case ELS_RJT_LOGIC: 1563 case ELS_RJT_UNAB: 1564 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n", 1565 fsp->rport->port_id, rjt->er_reason, 1566 rjt->er_explan); 1567 /* 1568 * If response got lost or is stuck in the 1569 * queue somewhere we have no idea if and when 1570 * the response will be received. So quarantine 1571 * the xid and retry the command. 1572 */ 1573 if (rjt->er_explan == ELS_EXPL_OXID_RXID) { 1574 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1575 ep->state |= FC_EX_QUARANTINE; 1576 fsp->state |= FC_SRB_ABORTED; 1577 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1578 break; 1579 } 1580 fc_fcp_recovery(fsp, FC_TRANS_RESET); 1581 break; 1582 } 1583 } else if (opcode == ELS_LS_ACC) { 1584 if (fsp->state & FC_SRB_ABORTED) 1585 goto unlock_out; 1586 1587 data_dir = fsp->cmd->sc_data_direction; 1588 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1589 offset = ntohl(recp->reca_fc4value); 1590 e_stat = ntohl(recp->reca_e_stat); 1591 1592 if (e_stat & ESB_ST_COMPLETE) { 1593 1594 /* 1595 * The exchange is complete. 1596 * 1597 * For output, we must've lost the response. 1598 * For input, all data must've been sent. 1599 * We lost may have lost the response 1600 * (and a confirmation was requested) and maybe 1601 * some data. 1602 * 1603 * If all data received, send SRR 1604 * asking for response. If partial data received, 1605 * or gaps, SRR requests data at start of gap. 1606 * Recovery via SRR relies on in-order-delivery. 1607 */ 1608 if (data_dir == DMA_TO_DEVICE) { 1609 r_ctl = FC_RCTL_DD_CMD_STATUS; 1610 } else if (fsp->xfer_contig_end == offset) { 1611 r_ctl = FC_RCTL_DD_CMD_STATUS; 1612 } else { 1613 offset = fsp->xfer_contig_end; 1614 r_ctl = FC_RCTL_DD_SOL_DATA; 1615 } 1616 fc_fcp_srr(fsp, r_ctl, offset); 1617 } else if (e_stat & ESB_ST_SEQ_INIT) { 1618 /* 1619 * The remote port has the initiative, so just 1620 * keep waiting for it to complete. 1621 */ 1622 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1623 } else { 1624 1625 /* 1626 * The exchange is incomplete, we have seq. initiative. 1627 * Lost response with requested confirmation, 1628 * lost confirmation, lost transfer ready or 1629 * lost write data. 1630 * 1631 * For output, if not all data was received, ask 1632 * for transfer ready to be repeated. 1633 * 1634 * If we received or sent all the data, send SRR to 1635 * request response. 1636 * 1637 * If we lost a response, we may have lost some read 1638 * data as well. 1639 */ 1640 r_ctl = FC_RCTL_DD_SOL_DATA; 1641 if (data_dir == DMA_TO_DEVICE) { 1642 r_ctl = FC_RCTL_DD_CMD_STATUS; 1643 if (offset < fsp->data_len) 1644 r_ctl = FC_RCTL_DD_DATA_DESC; 1645 } else if (offset == fsp->xfer_contig_end) { 1646 r_ctl = FC_RCTL_DD_CMD_STATUS; 1647 } else if (fsp->xfer_contig_end < offset) { 1648 offset = fsp->xfer_contig_end; 1649 } 1650 fc_fcp_srr(fsp, r_ctl, offset); 1651 } 1652 } 1653 unlock_out: 1654 fc_fcp_unlock_pkt(fsp); 1655 out: 1656 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1657 fc_frame_free(fp); 1658 } 1659 1660 /** 1661 * fc_fcp_rec_error() - Handler for REC errors 1662 * @fsp: The FCP packet the error is on 1663 * @fp: The REC frame 1664 */ 1665 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1666 { 1667 int error = PTR_ERR(fp); 1668 1669 if (fc_fcp_lock_pkt(fsp)) 1670 goto out; 1671 1672 switch (error) { 1673 case -FC_EX_CLOSED: 1674 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n", 1675 fsp, fsp->rport->port_id); 1676 fc_fcp_retry_cmd(fsp, FC_ERROR); 1677 break; 1678 1679 default: 1680 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1681 fsp, fsp->rport->port_id, error); 1682 fsp->status_code = FC_CMD_PLOGO; 1683 /* fall through */ 1684 1685 case -FC_EX_TIMEOUT: 1686 /* 1687 * Assume REC or LS_ACC was lost. 1688 * The exchange manager will have aborted REC, so retry. 1689 */ 1690 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n", 1691 fsp, fsp->rport->port_id, fsp->recov_retry, 1692 FC_MAX_RECOV_RETRY); 1693 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1694 fc_fcp_rec(fsp); 1695 else 1696 fc_fcp_recovery(fsp, FC_ERROR); 1697 break; 1698 } 1699 fc_fcp_unlock_pkt(fsp); 1700 out: 1701 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1702 } 1703 1704 /** 1705 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1706 * @fsp: The FCP pkt that needs to be aborted 1707 */ 1708 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1709 { 1710 FC_FCP_DBG(fsp, "start recovery code %x\n", code); 1711 fsp->status_code = code; 1712 fsp->cdb_status = 0; 1713 fsp->io_status = 0; 1714 /* 1715 * if this fails then we let the scsi command timer fire and 1716 * scsi-ml escalate. 1717 */ 1718 fc_fcp_send_abort(fsp); 1719 } 1720 1721 /** 1722 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1723 * @fsp: The FCP packet the SRR is to be sent on 1724 * @r_ctl: The R_CTL field for the SRR request 1725 * This is called after receiving status but insufficient data, or 1726 * when expecting status but the request has timed out. 1727 */ 1728 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1729 { 1730 struct fc_lport *lport = fsp->lp; 1731 struct fc_rport *rport; 1732 struct fc_rport_libfc_priv *rpriv; 1733 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1734 struct fc_seq *seq; 1735 struct fcp_srr *srr; 1736 struct fc_frame *fp; 1737 1738 rport = fsp->rport; 1739 rpriv = rport->dd_data; 1740 1741 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1742 rpriv->rp_state != RPORT_ST_READY) 1743 goto retry; /* shouldn't happen */ 1744 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1745 if (!fp) 1746 goto retry; 1747 1748 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1749 memset(srr, 0, sizeof(*srr)); 1750 srr->srr_op = ELS_SRR; 1751 srr->srr_ox_id = htons(ep->oxid); 1752 srr->srr_rx_id = htons(ep->rxid); 1753 srr->srr_r_ctl = r_ctl; 1754 srr->srr_rel_off = htonl(offset); 1755 1756 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1757 rpriv->local_port->port_id, FC_TYPE_FCP, 1758 FC_FCTL_REQ, 0); 1759 1760 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp, 1761 fc_fcp_pkt_destroy, 1762 fsp, get_fsp_rec_tov(fsp)); 1763 if (!seq) 1764 goto retry; 1765 1766 fsp->recov_seq = seq; 1767 fsp->xfer_len = offset; 1768 fsp->xfer_contig_end = offset; 1769 fsp->state &= ~FC_SRB_RCV_STATUS; 1770 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1771 return; 1772 retry: 1773 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1774 } 1775 1776 /** 1777 * fc_fcp_srr_resp() - Handler for SRR response 1778 * @seq: The sequence the SRR is on 1779 * @fp: The SRR frame 1780 * @arg: The FCP packet the SRR is on 1781 */ 1782 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1783 { 1784 struct fc_fcp_pkt *fsp = arg; 1785 struct fc_frame_header *fh; 1786 1787 if (IS_ERR(fp)) { 1788 fc_fcp_srr_error(fsp, fp); 1789 return; 1790 } 1791 1792 if (fc_fcp_lock_pkt(fsp)) 1793 goto out; 1794 1795 fh = fc_frame_header_get(fp); 1796 /* 1797 * BUG? fc_fcp_srr_error calls fc_exch_done which would release 1798 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1799 * then fc_exch_timeout would be sending an abort. The fc_exch_done 1800 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1801 * an abort response though. 1802 */ 1803 if (fh->fh_type == FC_TYPE_BLS) { 1804 fc_fcp_unlock_pkt(fsp); 1805 return; 1806 } 1807 1808 switch (fc_frame_payload_op(fp)) { 1809 case ELS_LS_ACC: 1810 fsp->recov_retry = 0; 1811 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1812 break; 1813 case ELS_LS_RJT: 1814 default: 1815 fc_fcp_recovery(fsp, FC_ERROR); 1816 break; 1817 } 1818 fc_fcp_unlock_pkt(fsp); 1819 out: 1820 fc_exch_done(seq); 1821 fc_frame_free(fp); 1822 } 1823 1824 /** 1825 * fc_fcp_srr_error() - Handler for SRR errors 1826 * @fsp: The FCP packet that the SRR error is on 1827 * @fp: The SRR frame 1828 */ 1829 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1830 { 1831 if (fc_fcp_lock_pkt(fsp)) 1832 goto out; 1833 switch (PTR_ERR(fp)) { 1834 case -FC_EX_TIMEOUT: 1835 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry); 1836 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1837 fc_fcp_rec(fsp); 1838 else 1839 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1840 break; 1841 case -FC_EX_CLOSED: /* e.g., link failure */ 1842 FC_FCP_DBG(fsp, "SRR error, exchange closed\n"); 1843 /* fall through */ 1844 default: 1845 fc_fcp_retry_cmd(fsp, FC_ERROR); 1846 break; 1847 } 1848 fc_fcp_unlock_pkt(fsp); 1849 out: 1850 fc_exch_done(fsp->recov_seq); 1851 } 1852 1853 /** 1854 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1855 * @lport: The local port to be checked 1856 */ 1857 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1858 { 1859 /* lock ? */ 1860 return (lport->state == LPORT_ST_READY) && 1861 lport->link_up && !lport->qfull; 1862 } 1863 1864 /** 1865 * fc_queuecommand() - The queuecommand function of the SCSI template 1866 * @shost: The Scsi_Host that the command was issued to 1867 * @cmd: The scsi_cmnd to be executed 1868 * 1869 * This is the i/o strategy routine, called by the SCSI layer. 1870 */ 1871 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1872 { 1873 struct fc_lport *lport = shost_priv(shost); 1874 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1875 struct fc_fcp_pkt *fsp; 1876 struct fc_rport_libfc_priv *rpriv; 1877 int rval; 1878 int rc = 0; 1879 struct fc_stats *stats; 1880 1881 rval = fc_remote_port_chkready(rport); 1882 if (rval) { 1883 sc_cmd->result = rval; 1884 sc_cmd->scsi_done(sc_cmd); 1885 return 0; 1886 } 1887 1888 if (!*(struct fc_remote_port **)rport->dd_data) { 1889 /* 1890 * rport is transitioning from blocked/deleted to 1891 * online 1892 */ 1893 sc_cmd->result = DID_IMM_RETRY << 16; 1894 sc_cmd->scsi_done(sc_cmd); 1895 goto out; 1896 } 1897 1898 rpriv = rport->dd_data; 1899 1900 if (!fc_fcp_lport_queue_ready(lport)) { 1901 if (lport->qfull) { 1902 if (fc_fcp_can_queue_ramp_down(lport)) 1903 shost_printk(KERN_ERR, lport->host, 1904 "libfc: queue full, " 1905 "reducing can_queue to %d.\n", 1906 lport->host->can_queue); 1907 } 1908 rc = SCSI_MLQUEUE_HOST_BUSY; 1909 goto out; 1910 } 1911 1912 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1913 if (fsp == NULL) { 1914 rc = SCSI_MLQUEUE_HOST_BUSY; 1915 goto out; 1916 } 1917 1918 /* 1919 * build the libfc request pkt 1920 */ 1921 fsp->cmd = sc_cmd; /* save the cmd */ 1922 fsp->rport = rport; /* set the remote port ptr */ 1923 1924 /* 1925 * set up the transfer length 1926 */ 1927 fsp->data_len = scsi_bufflen(sc_cmd); 1928 fsp->xfer_len = 0; 1929 1930 /* 1931 * setup the data direction 1932 */ 1933 stats = per_cpu_ptr(lport->stats, get_cpu()); 1934 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1935 fsp->req_flags = FC_SRB_READ; 1936 stats->InputRequests++; 1937 stats->InputBytes += fsp->data_len; 1938 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1939 fsp->req_flags = FC_SRB_WRITE; 1940 stats->OutputRequests++; 1941 stats->OutputBytes += fsp->data_len; 1942 } else { 1943 fsp->req_flags = 0; 1944 stats->ControlRequests++; 1945 } 1946 put_cpu(); 1947 1948 /* 1949 * send it to the lower layer 1950 * if we get -1 return then put the request in the pending 1951 * queue. 1952 */ 1953 rval = fc_fcp_pkt_send(lport, fsp); 1954 if (rval != 0) { 1955 fsp->state = FC_SRB_FREE; 1956 fc_fcp_pkt_release(fsp); 1957 rc = SCSI_MLQUEUE_HOST_BUSY; 1958 } 1959 out: 1960 return rc; 1961 } 1962 EXPORT_SYMBOL(fc_queuecommand); 1963 1964 /** 1965 * fc_io_compl() - Handle responses for completed commands 1966 * @fsp: The FCP packet that is complete 1967 * 1968 * Translates fcp_pkt errors to a Linux SCSI errors. 1969 * The fcp packet lock must be held when calling. 1970 */ 1971 static void fc_io_compl(struct fc_fcp_pkt *fsp) 1972 { 1973 struct fc_fcp_internal *si; 1974 struct scsi_cmnd *sc_cmd; 1975 struct fc_lport *lport; 1976 unsigned long flags; 1977 1978 /* release outstanding ddp context */ 1979 fc_fcp_ddp_done(fsp); 1980 1981 fsp->state |= FC_SRB_COMPL; 1982 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1983 spin_unlock_bh(&fsp->scsi_pkt_lock); 1984 del_timer_sync(&fsp->timer); 1985 spin_lock_bh(&fsp->scsi_pkt_lock); 1986 } 1987 1988 lport = fsp->lp; 1989 si = fc_get_scsi_internal(lport); 1990 1991 /* 1992 * if can_queue ramp down is done then try can_queue ramp up 1993 * since commands are completing now. 1994 */ 1995 if (si->last_can_queue_ramp_down_time) 1996 fc_fcp_can_queue_ramp_up(lport); 1997 1998 sc_cmd = fsp->cmd; 1999 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 2000 switch (fsp->status_code) { 2001 case FC_COMPLETE: 2002 if (fsp->cdb_status == 0) { 2003 /* 2004 * good I/O status 2005 */ 2006 sc_cmd->result = DID_OK << 16; 2007 if (fsp->scsi_resid) 2008 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 2009 } else { 2010 /* 2011 * transport level I/O was ok but scsi 2012 * has non zero status 2013 */ 2014 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 2015 } 2016 break; 2017 case FC_ERROR: 2018 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2019 "due to FC_ERROR\n"); 2020 sc_cmd->result = DID_ERROR << 16; 2021 break; 2022 case FC_DATA_UNDRUN: 2023 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 2024 /* 2025 * scsi status is good but transport level 2026 * underrun. 2027 */ 2028 if (fsp->state & FC_SRB_RCV_STATUS) { 2029 sc_cmd->result = DID_OK << 16; 2030 } else { 2031 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 2032 " due to FC_DATA_UNDRUN (trans)\n"); 2033 sc_cmd->result = DID_ERROR << 16; 2034 } 2035 } else { 2036 /* 2037 * scsi got underrun, this is an error 2038 */ 2039 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2040 "due to FC_DATA_UNDRUN (scsi)\n"); 2041 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 2042 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2043 } 2044 break; 2045 case FC_DATA_OVRRUN: 2046 /* 2047 * overrun is an error 2048 */ 2049 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2050 "due to FC_DATA_OVRRUN\n"); 2051 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2052 break; 2053 case FC_CMD_ABORTED: 2054 if (host_byte(sc_cmd->result) == DID_TIME_OUT) 2055 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " 2056 "due to FC_CMD_ABORTED\n"); 2057 else { 2058 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2059 "due to FC_CMD_ABORTED\n"); 2060 set_host_byte(sc_cmd, DID_ERROR); 2061 } 2062 sc_cmd->result |= fsp->io_status; 2063 break; 2064 case FC_CMD_RESET: 2065 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 2066 "due to FC_CMD_RESET\n"); 2067 sc_cmd->result = (DID_RESET << 16); 2068 break; 2069 case FC_TRANS_RESET: 2070 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml " 2071 "due to FC_TRANS_RESET\n"); 2072 sc_cmd->result = (DID_SOFT_ERROR << 16); 2073 break; 2074 case FC_HRD_ERROR: 2075 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 2076 "due to FC_HRD_ERROR\n"); 2077 sc_cmd->result = (DID_NO_CONNECT << 16); 2078 break; 2079 case FC_CRC_ERROR: 2080 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 2081 "due to FC_CRC_ERROR\n"); 2082 sc_cmd->result = (DID_PARITY << 16); 2083 break; 2084 case FC_TIMED_OUT: 2085 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 2086 "due to FC_TIMED_OUT\n"); 2087 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 2088 break; 2089 default: 2090 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2091 "due to unknown error\n"); 2092 sc_cmd->result = (DID_ERROR << 16); 2093 break; 2094 } 2095 2096 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 2097 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2098 2099 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2100 list_del(&fsp->list); 2101 sc_cmd->SCp.ptr = NULL; 2102 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2103 sc_cmd->scsi_done(sc_cmd); 2104 2105 /* release ref from initial allocation in queue command */ 2106 fc_fcp_pkt_release(fsp); 2107 } 2108 2109 /** 2110 * fc_eh_abort() - Abort a command 2111 * @sc_cmd: The SCSI command to abort 2112 * 2113 * From SCSI host template. 2114 * Send an ABTS to the target device and wait for the response. 2115 */ 2116 int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2117 { 2118 struct fc_fcp_pkt *fsp; 2119 struct fc_lport *lport; 2120 struct fc_fcp_internal *si; 2121 int rc = FAILED; 2122 unsigned long flags; 2123 int rval; 2124 2125 rval = fc_block_scsi_eh(sc_cmd); 2126 if (rval) 2127 return rval; 2128 2129 lport = shost_priv(sc_cmd->device->host); 2130 if (lport->state != LPORT_ST_READY) 2131 return rc; 2132 else if (!lport->link_up) 2133 return rc; 2134 2135 si = fc_get_scsi_internal(lport); 2136 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2137 fsp = CMD_SP(sc_cmd); 2138 if (!fsp) { 2139 /* command completed while scsi eh was setting up */ 2140 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2141 return SUCCESS; 2142 } 2143 /* grab a ref so the fsp and sc_cmd cannot be released from under us */ 2144 fc_fcp_pkt_hold(fsp); 2145 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2146 2147 if (fc_fcp_lock_pkt(fsp)) { 2148 /* completed while we were waiting for timer to be deleted */ 2149 rc = SUCCESS; 2150 goto release_pkt; 2151 } 2152 2153 rc = fc_fcp_pkt_abort(fsp); 2154 fc_fcp_unlock_pkt(fsp); 2155 2156 release_pkt: 2157 fc_fcp_pkt_release(fsp); 2158 return rc; 2159 } 2160 EXPORT_SYMBOL(fc_eh_abort); 2161 2162 /** 2163 * fc_eh_device_reset() - Reset a single LUN 2164 * @sc_cmd: The SCSI command which identifies the device whose 2165 * LUN is to be reset 2166 * 2167 * Set from SCSI host template. 2168 */ 2169 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2170 { 2171 struct fc_lport *lport; 2172 struct fc_fcp_pkt *fsp; 2173 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2174 int rc = FAILED; 2175 int rval; 2176 2177 rval = fc_block_scsi_eh(sc_cmd); 2178 if (rval) 2179 return rval; 2180 2181 lport = shost_priv(sc_cmd->device->host); 2182 2183 if (lport->state != LPORT_ST_READY) 2184 return rc; 2185 2186 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2187 2188 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2189 if (fsp == NULL) { 2190 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2191 goto out; 2192 } 2193 2194 /* 2195 * Build the libfc request pkt. Do not set the scsi cmnd, because 2196 * the sc passed in is not setup for execution like when sent 2197 * through the queuecommand callout. 2198 */ 2199 fsp->rport = rport; /* set the remote port ptr */ 2200 2201 /* 2202 * flush outstanding commands 2203 */ 2204 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2205 fsp->state = FC_SRB_FREE; 2206 fc_fcp_pkt_release(fsp); 2207 2208 out: 2209 return rc; 2210 } 2211 EXPORT_SYMBOL(fc_eh_device_reset); 2212 2213 /** 2214 * fc_eh_host_reset() - Reset a Scsi_Host. 2215 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2216 */ 2217 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2218 { 2219 struct Scsi_Host *shost = sc_cmd->device->host; 2220 struct fc_lport *lport = shost_priv(shost); 2221 unsigned long wait_tmo; 2222 2223 FC_SCSI_DBG(lport, "Resetting host\n"); 2224 2225 fc_block_scsi_eh(sc_cmd); 2226 2227 fc_lport_reset(lport); 2228 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2229 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2230 wait_tmo)) 2231 msleep(1000); 2232 2233 if (fc_fcp_lport_queue_ready(lport)) { 2234 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2235 "on port (%6.6x)\n", lport->port_id); 2236 return SUCCESS; 2237 } else { 2238 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2239 "port (%6.6x) is not ready.\n", 2240 lport->port_id); 2241 return FAILED; 2242 } 2243 } 2244 EXPORT_SYMBOL(fc_eh_host_reset); 2245 2246 /** 2247 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2248 * @sdev: The SCSI device that identifies the SCSI host 2249 * 2250 * Configures queue depth based on host's cmd_per_len. If not set 2251 * then we use the libfc default. 2252 */ 2253 int fc_slave_alloc(struct scsi_device *sdev) 2254 { 2255 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2256 2257 if (!rport || fc_remote_port_chkready(rport)) 2258 return -ENXIO; 2259 2260 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2261 return 0; 2262 } 2263 EXPORT_SYMBOL(fc_slave_alloc); 2264 2265 /** 2266 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2267 * @lport: The local port that no longer needs the FCP layer 2268 */ 2269 void fc_fcp_destroy(struct fc_lport *lport) 2270 { 2271 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2272 2273 if (!list_empty(&si->scsi_pkt_queue)) 2274 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2275 "port (%6.6x)\n", lport->port_id); 2276 2277 mempool_destroy(si->scsi_pkt_pool); 2278 kfree(si); 2279 lport->scsi_priv = NULL; 2280 } 2281 EXPORT_SYMBOL(fc_fcp_destroy); 2282 2283 int fc_setup_fcp(void) 2284 { 2285 int rc = 0; 2286 2287 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2288 sizeof(struct fc_fcp_pkt), 2289 0, SLAB_HWCACHE_ALIGN, NULL); 2290 if (!scsi_pkt_cachep) { 2291 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2292 "module load failed!"); 2293 rc = -ENOMEM; 2294 } 2295 2296 return rc; 2297 } 2298 2299 void fc_destroy_fcp(void) 2300 { 2301 if (scsi_pkt_cachep) 2302 kmem_cache_destroy(scsi_pkt_cachep); 2303 } 2304 2305 /** 2306 * fc_fcp_init() - Initialize the FCP layer for a local port 2307 * @lport: The local port to initialize the exchange layer for 2308 */ 2309 int fc_fcp_init(struct fc_lport *lport) 2310 { 2311 int rc; 2312 struct fc_fcp_internal *si; 2313 2314 if (!lport->tt.fcp_cmd_send) 2315 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2316 2317 if (!lport->tt.fcp_cleanup) 2318 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2319 2320 if (!lport->tt.fcp_abort_io) 2321 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2322 2323 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2324 if (!si) 2325 return -ENOMEM; 2326 lport->scsi_priv = si; 2327 si->max_can_queue = lport->host->can_queue; 2328 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2329 spin_lock_init(&si->scsi_queue_lock); 2330 2331 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2332 if (!si->scsi_pkt_pool) { 2333 rc = -ENOMEM; 2334 goto free_internal; 2335 } 2336 return 0; 2337 2338 free_internal: 2339 kfree(si); 2340 return rc; 2341 } 2342 EXPORT_SYMBOL(fc_fcp_init); 2343