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