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