1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright(c) 2007 Intel Corporation. All rights reserved. 4 * Copyright(c) 2008 Red Hat, Inc. All rights reserved. 5 * Copyright(c) 2008 Mike Christie 6 * 7 * Maintained at www.Open-FCoE.org 8 */ 9 10#include <linux/module.h> 11#include <linux/delay.h> 12#include <linux/kernel.h> 13#include <linux/types.h> 14#include <linux/spinlock.h> 15#include <linux/scatterlist.h> 16#include <linux/err.h> 17#include <linux/crc32.h> 18#include <linux/slab.h> 19 20#include <scsi/scsi_tcq.h> 21#include <scsi/scsi.h> 22#include <scsi/scsi_host.h> 23#include <scsi/scsi_device.h> 24#include <scsi/scsi_cmnd.h> 25 26#include <scsi/fc/fc_fc2.h> 27 28#include <scsi/libfc.h> 29#include <scsi/fc_encode.h> 30 31#include "fc_libfc.h" 32 33static struct kmem_cache *scsi_pkt_cachep; 34 35/* SRB state definitions */ 36#define FC_SRB_FREE 0 /* cmd is free */ 37#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ 38#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ 39#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ 40#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ 41#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ 42#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ 43#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ 44 45#define FC_SRB_READ (1 << 1) 46#define FC_SRB_WRITE (1 << 0) 47 48/* 49 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock 50 */ 51#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) 52#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) 53#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) 54#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) 55#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) 56 57/** 58 * struct fc_fcp_internal - FCP layer internal data 59 * @scsi_pkt_pool: Memory pool to draw FCP packets from 60 * @scsi_queue_lock: Protects the scsi_pkt_queue 61 * @scsi_pkt_queue: Current FCP packets 62 * @last_can_queue_ramp_down_time: ramp down time 63 * @last_can_queue_ramp_up_time: ramp up time 64 * @max_can_queue: max can_queue size 65 */ 66struct fc_fcp_internal { 67 mempool_t *scsi_pkt_pool; 68 spinlock_t scsi_queue_lock; 69 struct list_head scsi_pkt_queue; 70 unsigned long last_can_queue_ramp_down_time; 71 unsigned long last_can_queue_ramp_up_time; 72 int max_can_queue; 73}; 74 75#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) 76 77/* 78 * function prototypes 79 * FC scsi I/O related functions 80 */ 81static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); 82static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); 83static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); 84static void fc_fcp_complete_locked(struct fc_fcp_pkt *); 85static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); 86static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); 87static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); 88static void fc_fcp_timeout(struct timer_list *); 89static void fc_fcp_rec(struct fc_fcp_pkt *); 90static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); 91static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); 92static void fc_io_compl(struct fc_fcp_pkt *); 93 94static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); 95static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); 96static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); 97 98/* 99 * command status codes 100 */ 101#define FC_COMPLETE 0 102#define FC_CMD_ABORTED 1 103#define FC_CMD_RESET 2 104#define FC_CMD_PLOGO 3 105#define FC_SNS_RCV 4 106#define FC_TRANS_ERR 5 107#define FC_DATA_OVRRUN 6 108#define FC_DATA_UNDRUN 7 109#define FC_ERROR 8 110#define FC_HRD_ERROR 9 111#define FC_CRC_ERROR 10 112#define FC_TIMED_OUT 11 113#define FC_TRANS_RESET 12 114 115/* 116 * Error recovery timeout values. 117 */ 118#define FC_SCSI_TM_TOV (10 * HZ) 119#define FC_HOST_RESET_TIMEOUT (30 * HZ) 120#define FC_CAN_QUEUE_PERIOD (60 * HZ) 121 122#define FC_MAX_ERROR_CNT 5 123#define FC_MAX_RECOV_RETRY 3 124 125#define FC_FCP_DFLT_QUEUE_DEPTH 32 126 127/** 128 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt 129 * @lport: The local port that the FCP packet is for 130 * @gfp: GFP flags for allocation 131 * 132 * Return value: fcp_pkt structure or null on allocation failure. 133 * Context: Can be called from process context, no lock is required. 134 */ 135static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) 136{ 137 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 138 struct fc_fcp_pkt *fsp; 139 140 fsp = mempool_alloc(si->scsi_pkt_pool, gfp); 141 if (fsp) { 142 memset(fsp, 0, sizeof(*fsp)); 143 fsp->lp = lport; 144 fsp->xfer_ddp = FC_XID_UNKNOWN; 145 refcount_set(&fsp->ref_cnt, 1); 146 timer_setup(&fsp->timer, NULL, 0); 147 INIT_LIST_HEAD(&fsp->list); 148 spin_lock_init(&fsp->scsi_pkt_lock); 149 } else { 150 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; 151 put_cpu(); 152 } 153 return fsp; 154} 155 156/** 157 * fc_fcp_pkt_release() - Release hold on a fcp_pkt 158 * @fsp: The FCP packet to be released 159 * 160 * Context: Can be called from process or interrupt context, 161 * no lock is required. 162 */ 163static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) 164{ 165 if (refcount_dec_and_test(&fsp->ref_cnt)) { 166 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); 167 168 mempool_free(fsp, si->scsi_pkt_pool); 169 } 170} 171 172/** 173 * fc_fcp_pkt_hold() - Hold a fcp_pkt 174 * @fsp: The FCP packet to be held 175 */ 176static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) 177{ 178 refcount_inc(&fsp->ref_cnt); 179} 180 181/** 182 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt 183 * @seq: The sequence that the FCP packet is on (required by destructor API) 184 * @fsp: The FCP packet to be released 185 * 186 * This routine is called by a destructor callback in the fc_exch_seq_send() 187 * routine of the libfc Transport Template. The 'struct fc_seq' is a required 188 * argument even though it is not used by this routine. 189 * 190 * Context: No locking required. 191 */ 192static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) 193{ 194 fc_fcp_pkt_release(fsp); 195} 196 197/** 198 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count 199 * @fsp: The FCP packet to be locked and incremented 200 * 201 * We should only return error if we return a command to SCSI-ml before 202 * getting a response. This can happen in cases where we send a abort, but 203 * do not wait for the response and the abort and command can be passing 204 * each other on the wire/network-layer. 205 * 206 * Note: this function locks the packet and gets a reference to allow 207 * callers to call the completion function while the lock is held and 208 * not have to worry about the packets refcount. 209 * 210 * TODO: Maybe we should just have callers grab/release the lock and 211 * have a function that they call to verify the fsp and grab a ref if 212 * needed. 213 */ 214static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) 215{ 216 spin_lock_bh(&fsp->scsi_pkt_lock); 217 if (fsp->state & FC_SRB_COMPL) { 218 spin_unlock_bh(&fsp->scsi_pkt_lock); 219 return -EPERM; 220 } 221 222 fc_fcp_pkt_hold(fsp); 223 return 0; 224} 225 226/** 227 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its 228 * reference count 229 * @fsp: The FCP packet to be unlocked and decremented 230 */ 231static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) 232{ 233 spin_unlock_bh(&fsp->scsi_pkt_lock); 234 fc_fcp_pkt_release(fsp); 235} 236 237/** 238 * fc_fcp_timer_set() - Start a timer for a fcp_pkt 239 * @fsp: The FCP packet to start a timer for 240 * @delay: The timeout period in jiffies 241 */ 242static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) 243{ 244 if (!(fsp->state & FC_SRB_COMPL)) { 245 mod_timer(&fsp->timer, jiffies + delay); 246 fsp->timer_delay = delay; 247 } 248} 249 250static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp) 251{ 252 fsp->state |= FC_SRB_ABORTED; 253 fsp->state &= ~FC_SRB_ABORT_PENDING; 254 255 if (fsp->wait_for_comp) 256 complete(&fsp->tm_done); 257 else 258 fc_fcp_complete_locked(fsp); 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 */ 266static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) 267{ 268 int rc; 269 270 if (!fsp->seq_ptr) 271 return -EINVAL; 272 273 if (fsp->state & FC_SRB_ABORT_PENDING) { 274 FC_FCP_DBG(fsp, "abort already pending\n"); 275 return -EBUSY; 276 } 277 278 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; 279 put_cpu(); 280 281 fsp->state |= FC_SRB_ABORT_PENDING; 282 rc = fc_seq_exch_abort(fsp->seq_ptr, 0); 283 /* 284 * fc_seq_exch_abort() might return -ENXIO if 285 * the sequence is already completed 286 */ 287 if (rc == -ENXIO) { 288 fc_fcp_abort_done(fsp); 289 rc = 0; 290 } 291 return rc; 292} 293 294/** 295 * fc_fcp_retry_cmd() - Retry a fcp_pkt 296 * @fsp: The FCP packet to be retried 297 * @status_code: The FCP status code to set 298 * 299 * Sets the status code to be FC_ERROR and then calls 300 * fc_fcp_complete_locked() which in turn calls fc_io_compl(). 301 * fc_io_compl() will notify the SCSI-ml that the I/O is done. 302 * The SCSI-ml will retry the command. 303 */ 304static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code) 305{ 306 if (fsp->seq_ptr) { 307 fc_exch_done(fsp->seq_ptr); 308 fsp->seq_ptr = NULL; 309 } 310 311 fsp->state &= ~FC_SRB_ABORT_PENDING; 312 fsp->io_status = 0; 313 fsp->status_code = status_code; 314 fc_fcp_complete_locked(fsp); 315} 316 317/** 318 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context 319 * @fsp: The FCP packet that will manage the DDP frames 320 * @xid: The XID that will be used for the DDP exchange 321 */ 322void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) 323{ 324 struct fc_lport *lport; 325 326 lport = fsp->lp; 327 if ((fsp->req_flags & FC_SRB_READ) && 328 (lport->lro_enabled) && (lport->tt.ddp_setup)) { 329 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), 330 scsi_sg_count(fsp->cmd))) 331 fsp->xfer_ddp = xid; 332 } 333} 334 335/** 336 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any 337 * DDP related resources for a fcp_pkt 338 * @fsp: The FCP packet that DDP had been used on 339 */ 340void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) 341{ 342 struct fc_lport *lport; 343 344 if (!fsp) 345 return; 346 347 if (fsp->xfer_ddp == FC_XID_UNKNOWN) 348 return; 349 350 lport = fsp->lp; 351 if (lport->tt.ddp_done) { 352 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); 353 fsp->xfer_ddp = FC_XID_UNKNOWN; 354 } 355} 356 357/** 358 * fc_fcp_can_queue_ramp_up() - increases can_queue 359 * @lport: lport to ramp up can_queue 360 */ 361static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) 362{ 363 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 364 unsigned long flags; 365 int can_queue; 366 367 spin_lock_irqsave(lport->host->host_lock, flags); 368 369 if (si->last_can_queue_ramp_up_time && 370 (time_before(jiffies, si->last_can_queue_ramp_up_time + 371 FC_CAN_QUEUE_PERIOD))) 372 goto unlock; 373 374 if (time_before(jiffies, si->last_can_queue_ramp_down_time + 375 FC_CAN_QUEUE_PERIOD)) 376 goto unlock; 377 378 si->last_can_queue_ramp_up_time = jiffies; 379 380 can_queue = lport->host->can_queue << 1; 381 if (can_queue >= si->max_can_queue) { 382 can_queue = si->max_can_queue; 383 si->last_can_queue_ramp_down_time = 0; 384 } 385 lport->host->can_queue = can_queue; 386 shost_printk(KERN_ERR, lport->host, "libfc: increased " 387 "can_queue to %d.\n", can_queue); 388 389unlock: 390 spin_unlock_irqrestore(lport->host->host_lock, flags); 391} 392 393/** 394 * fc_fcp_can_queue_ramp_down() - reduces can_queue 395 * @lport: lport to reduce can_queue 396 * 397 * If we are getting memory allocation failures, then we may 398 * be trying to execute too many commands. We let the running 399 * commands complete or timeout, then try again with a reduced 400 * can_queue. Eventually we will hit the point where we run 401 * on all reserved structs. 402 */ 403static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport) 404{ 405 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 406 unsigned long flags; 407 int can_queue; 408 bool changed = false; 409 410 spin_lock_irqsave(lport->host->host_lock, flags); 411 412 if (si->last_can_queue_ramp_down_time && 413 (time_before(jiffies, si->last_can_queue_ramp_down_time + 414 FC_CAN_QUEUE_PERIOD))) 415 goto unlock; 416 417 si->last_can_queue_ramp_down_time = jiffies; 418 419 can_queue = lport->host->can_queue; 420 can_queue >>= 1; 421 if (!can_queue) 422 can_queue = 1; 423 lport->host->can_queue = can_queue; 424 changed = true; 425 426unlock: 427 spin_unlock_irqrestore(lport->host->host_lock, flags); 428 return changed; 429} 430 431/* 432 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. 433 * @lport: fc lport struct 434 * @len: payload length 435 * 436 * Allocates fc_frame structure and buffer but if fails to allocate 437 * then reduce can_queue. 438 */ 439static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, 440 size_t len) 441{ 442 struct fc_frame *fp; 443 444 fp = fc_frame_alloc(lport, len); 445 if (likely(fp)) 446 return fp; 447 448 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; 449 put_cpu(); 450 /* error case */ 451 fc_fcp_can_queue_ramp_down(lport); 452 shost_printk(KERN_ERR, lport->host, 453 "libfc: Could not allocate frame, " 454 "reducing can_queue to %d.\n", lport->host->can_queue); 455 return NULL; 456} 457 458/** 459 * get_fsp_rec_tov() - Helper function to get REC_TOV 460 * @fsp: the FCP packet 461 * 462 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second 463 */ 464static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) 465{ 466 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; 467 unsigned int e_d_tov = FC_DEF_E_D_TOV; 468 469 if (rpriv && rpriv->e_d_tov > e_d_tov) 470 e_d_tov = rpriv->e_d_tov; 471 return msecs_to_jiffies(e_d_tov) + HZ; 472} 473 474/** 475 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target 476 * @fsp: The FCP packet the data is on 477 * @fp: The data frame 478 */ 479static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 480{ 481 struct scsi_cmnd *sc = fsp->cmd; 482 struct fc_lport *lport = fsp->lp; 483 struct fc_stats *stats; 484 struct fc_frame_header *fh; 485 size_t start_offset; 486 size_t offset; 487 u32 crc; 488 u32 copy_len = 0; 489 size_t len; 490 void *buf; 491 struct scatterlist *sg; 492 u32 nents; 493 u8 host_bcode = FC_COMPLETE; 494 495 fh = fc_frame_header_get(fp); 496 offset = ntohl(fh->fh_parm_offset); 497 start_offset = offset; 498 len = fr_len(fp) - sizeof(*fh); 499 buf = fc_frame_payload_get(fp, 0); 500 501 /* 502 * if this I/O is ddped then clear it and initiate recovery since data 503 * frames are expected to be placed directly in that case. 504 * 505 * Indicate error to scsi-ml because something went wrong with the 506 * ddp handling to get us here. 507 */ 508 if (fsp->xfer_ddp != FC_XID_UNKNOWN) { 509 fc_fcp_ddp_done(fsp); 510 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); 511 host_bcode = FC_ERROR; 512 goto err; 513 } 514 if (offset + len > fsp->data_len) { 515 /* this should never happen */ 516 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && 517 fc_frame_crc_check(fp)) 518 goto crc_err; 519 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " 520 "data_len %x\n", len, offset, fsp->data_len); 521 522 /* Data is corrupted indicate scsi-ml should retry */ 523 host_bcode = FC_DATA_OVRRUN; 524 goto err; 525 } 526 if (offset != fsp->xfer_len) 527 fsp->state |= FC_SRB_DISCONTIG; 528 529 sg = scsi_sglist(sc); 530 nents = scsi_sg_count(sc); 531 532 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { 533 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 534 &offset, NULL); 535 } else { 536 crc = crc32(~0, (u8 *) fh, sizeof(*fh)); 537 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, 538 &offset, &crc); 539 buf = fc_frame_payload_get(fp, 0); 540 if (len % 4) 541 crc = crc32(crc, buf + len, 4 - (len % 4)); 542 543 if (~crc != le32_to_cpu(fr_crc(fp))) { 544crc_err: 545 stats = per_cpu_ptr(lport->stats, get_cpu()); 546 stats->ErrorFrames++; 547 /* per cpu count, not total count, but OK for limit */ 548 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) 549 printk(KERN_WARNING "libfc: CRC error on data " 550 "frame for port (%6.6x)\n", 551 lport->port_id); 552 put_cpu(); 553 /* 554 * Assume the frame is total garbage. 555 * We may have copied it over the good part 556 * of the buffer. 557 * If so, we need to retry the entire operation. 558 * Otherwise, ignore it. 559 */ 560 if (fsp->state & FC_SRB_DISCONTIG) { 561 host_bcode = FC_CRC_ERROR; 562 goto err; 563 } 564 return; 565 } 566 } 567 568 if (fsp->xfer_contig_end == start_offset) 569 fsp->xfer_contig_end += copy_len; 570 fsp->xfer_len += copy_len; 571 572 /* 573 * In the very rare event that this data arrived after the response 574 * and completes the transfer, call the completion handler. 575 */ 576 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && 577 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) { 578 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" ); 579 fc_fcp_complete_locked(fsp); 580 } 581 return; 582err: 583 fc_fcp_recovery(fsp, host_bcode); 584} 585 586/** 587 * fc_fcp_send_data() - Send SCSI data to a target 588 * @fsp: The FCP packet the data is on 589 * @seq: The sequence the data is to be sent on 590 * @offset: The starting offset for this data request 591 * @seq_blen: The burst length for this data request 592 * 593 * Called after receiving a Transfer Ready data descriptor. 594 * If the LLD is capable of sequence offload then send down the 595 * seq_blen amount of data in single frame, otherwise send 596 * multiple frames of the maximum frame payload supported by 597 * the target port. 598 */ 599static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, 600 size_t offset, size_t seq_blen) 601{ 602 struct fc_exch *ep; 603 struct scsi_cmnd *sc; 604 struct scatterlist *sg; 605 struct fc_frame *fp = NULL; 606 struct fc_lport *lport = fsp->lp; 607 struct page *page; 608 size_t remaining; 609 size_t t_blen; 610 size_t tlen; 611 size_t sg_bytes; 612 size_t frame_offset, fh_parm_offset; 613 size_t off; 614 int error; 615 void *data = NULL; 616 void *page_addr; 617 int using_sg = lport->sg_supp; 618 u32 f_ctl; 619 620 WARN_ON(seq_blen <= 0); 621 if (unlikely(offset + seq_blen > fsp->data_len)) { 622 /* this should never happen */ 623 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " 624 "offset %zx\n", seq_blen, offset); 625 fc_fcp_send_abort(fsp); 626 return 0; 627 } else if (offset != fsp->xfer_len) { 628 /* Out of Order Data Request - no problem, but unexpected. */ 629 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " 630 "seq_blen %zx offset %zx\n", seq_blen, offset); 631 } 632 633 /* 634 * if LLD is capable of seq_offload then set transport 635 * burst length (t_blen) to seq_blen, otherwise set t_blen 636 * to max FC frame payload previously set in fsp->max_payload. 637 */ 638 t_blen = fsp->max_payload; 639 if (lport->seq_offload) { 640 t_blen = min(seq_blen, (size_t)lport->lso_max); 641 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", 642 fsp, seq_blen, lport->lso_max, t_blen); 643 } 644 645 if (t_blen > 512) 646 t_blen &= ~(512 - 1); /* round down to block size */ 647 sc = fsp->cmd; 648 649 remaining = seq_blen; 650 fh_parm_offset = frame_offset = offset; 651 tlen = 0; 652 seq = fc_seq_start_next(seq); 653 f_ctl = FC_FC_REL_OFF; 654 WARN_ON(!seq); 655 656 sg = scsi_sglist(sc); 657 658 while (remaining > 0 && sg) { 659 if (offset >= sg->length) { 660 offset -= sg->length; 661 sg = sg_next(sg); 662 continue; 663 } 664 if (!fp) { 665 tlen = min(t_blen, remaining); 666 667 /* 668 * TODO. Temporary workaround. fc_seq_send() can't 669 * handle odd lengths in non-linear skbs. 670 * This will be the final fragment only. 671 */ 672 if (tlen % 4) 673 using_sg = 0; 674 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); 675 if (!fp) 676 return -ENOMEM; 677 678 data = fc_frame_header_get(fp) + 1; 679 fh_parm_offset = frame_offset; 680 fr_max_payload(fp) = fsp->max_payload; 681 } 682 683 off = offset + sg->offset; 684 sg_bytes = min(tlen, sg->length - offset); 685 sg_bytes = min(sg_bytes, 686 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); 687 page = sg_page(sg) + (off >> PAGE_SHIFT); 688 if (using_sg) { 689 get_page(page); 690 skb_fill_page_desc(fp_skb(fp), 691 skb_shinfo(fp_skb(fp))->nr_frags, 692 page, off & ~PAGE_MASK, sg_bytes); 693 fp_skb(fp)->data_len += sg_bytes; 694 fr_len(fp) += sg_bytes; 695 fp_skb(fp)->truesize += PAGE_SIZE; 696 } else { 697 /* 698 * The scatterlist item may be bigger than PAGE_SIZE, 699 * but we must not cross pages inside the kmap. 700 */ 701 page_addr = kmap_atomic(page); 702 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), 703 sg_bytes); 704 kunmap_atomic(page_addr); 705 data += sg_bytes; 706 } 707 offset += sg_bytes; 708 frame_offset += sg_bytes; 709 tlen -= sg_bytes; 710 remaining -= sg_bytes; 711 712 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && 713 (tlen)) 714 continue; 715 716 /* 717 * Send sequence with transfer sequence initiative in case 718 * this is last FCP frame of the sequence. 719 */ 720 if (remaining == 0) 721 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; 722 723 ep = fc_seq_exch(seq); 724 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, 725 FC_TYPE_FCP, f_ctl, fh_parm_offset); 726 727 /* 728 * send fragment using for a sequence. 729 */ 730 error = fc_seq_send(lport, seq, fp); 731 if (error) { 732 WARN_ON(1); /* send error should be rare */ 733 return error; 734 } 735 fp = NULL; 736 } 737 fsp->xfer_len += seq_blen; /* premature count? */ 738 return 0; 739} 740 741/** 742 * fc_fcp_abts_resp() - Receive an ABTS response 743 * @fsp: The FCP packet that is being aborted 744 * @fp: The response frame 745 */ 746static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 747{ 748 int ba_done = 1; 749 struct fc_ba_rjt *brp; 750 struct fc_frame_header *fh; 751 752 fh = fc_frame_header_get(fp); 753 switch (fh->fh_r_ctl) { 754 case FC_RCTL_BA_ACC: 755 break; 756 case FC_RCTL_BA_RJT: 757 brp = fc_frame_payload_get(fp, sizeof(*brp)); 758 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) 759 break; 760 fallthrough; 761 default: 762 /* 763 * we will let the command timeout 764 * and scsi-ml recover in this case, 765 * therefore cleared the ba_done flag. 766 */ 767 ba_done = 0; 768 } 769 770 if (ba_done) 771 fc_fcp_abort_done(fsp); 772} 773 774/** 775 * fc_fcp_recv() - Receive an FCP frame 776 * @seq: The sequence the frame is on 777 * @fp: The received frame 778 * @arg: The related FCP packet 779 * 780 * Context: Called from Soft IRQ context. Can not be called 781 * holding the FCP packet list lock. 782 */ 783static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) 784{ 785 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 786 struct fc_lport *lport = fsp->lp; 787 struct fc_frame_header *fh; 788 struct fcp_txrdy *dd; 789 u8 r_ctl; 790 int rc = 0; 791 792 if (IS_ERR(fp)) { 793 fc_fcp_error(fsp, fp); 794 return; 795 } 796 797 fh = fc_frame_header_get(fp); 798 r_ctl = fh->fh_r_ctl; 799 800 if (lport->state != LPORT_ST_READY) { 801 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n", 802 lport->state, r_ctl); 803 goto out; 804 } 805 if (fc_fcp_lock_pkt(fsp)) 806 goto out; 807 808 if (fh->fh_type == FC_TYPE_BLS) { 809 fc_fcp_abts_resp(fsp, fp); 810 goto unlock; 811 } 812 813 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) { 814 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl); 815 goto unlock; 816 } 817 818 if (r_ctl == FC_RCTL_DD_DATA_DESC) { 819 /* 820 * received XFER RDY from the target 821 * need to send data to the target 822 */ 823 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 824 dd = fc_frame_payload_get(fp, sizeof(*dd)); 825 WARN_ON(!dd); 826 827 rc = fc_fcp_send_data(fsp, seq, 828 (size_t) ntohl(dd->ft_data_ro), 829 (size_t) ntohl(dd->ft_burst_len)); 830 if (!rc) 831 seq->rec_data = fsp->xfer_len; 832 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { 833 /* 834 * received a DATA frame 835 * next we will copy the data to the system buffer 836 */ 837 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ 838 fc_fcp_recv_data(fsp, fp); 839 seq->rec_data = fsp->xfer_contig_end; 840 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { 841 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); 842 843 fc_fcp_resp(fsp, fp); 844 } else { 845 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); 846 } 847unlock: 848 fc_fcp_unlock_pkt(fsp); 849out: 850 fc_frame_free(fp); 851} 852 853/** 854 * fc_fcp_resp() - Handler for FCP responses 855 * @fsp: The FCP packet the response is for 856 * @fp: The response frame 857 */ 858static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 859{ 860 struct fc_frame_header *fh; 861 struct fcp_resp *fc_rp; 862 struct fcp_resp_ext *rp_ex; 863 struct fcp_resp_rsp_info *fc_rp_info; 864 u32 plen; 865 u32 expected_len; 866 u32 respl = 0; 867 u32 snsl = 0; 868 u8 flags = 0; 869 870 plen = fr_len(fp); 871 fh = (struct fc_frame_header *)fr_hdr(fp); 872 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) 873 goto len_err; 874 plen -= sizeof(*fh); 875 fc_rp = (struct fcp_resp *)(fh + 1); 876 fsp->cdb_status = fc_rp->fr_status; 877 flags = fc_rp->fr_flags; 878 fsp->scsi_comp_flags = flags; 879 expected_len = fsp->data_len; 880 881 /* if ddp, update xfer len */ 882 fc_fcp_ddp_done(fsp); 883 884 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { 885 rp_ex = (void *)(fc_rp + 1); 886 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { 887 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) 888 goto len_err; 889 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); 890 if (flags & FCP_RSP_LEN_VAL) { 891 respl = ntohl(rp_ex->fr_rsp_len); 892 if ((respl != FCP_RESP_RSP_INFO_LEN4) && 893 (respl != FCP_RESP_RSP_INFO_LEN8)) 894 goto len_err; 895 if (fsp->wait_for_comp) { 896 /* Abuse cdb_status for rsp code */ 897 fsp->cdb_status = fc_rp_info->rsp_code; 898 complete(&fsp->tm_done); 899 /* 900 * tmfs will not have any scsi cmd so 901 * exit here 902 */ 903 return; 904 } 905 } 906 if (flags & FCP_SNS_LEN_VAL) { 907 snsl = ntohl(rp_ex->fr_sns_len); 908 if (snsl > SCSI_SENSE_BUFFERSIZE) 909 snsl = SCSI_SENSE_BUFFERSIZE; 910 memcpy(fsp->cmd->sense_buffer, 911 (char *)fc_rp_info + respl, snsl); 912 } 913 } 914 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { 915 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) 916 goto len_err; 917 if (flags & FCP_RESID_UNDER) { 918 fsp->scsi_resid = ntohl(rp_ex->fr_resid); 919 /* 920 * The cmnd->underflow is the minimum number of 921 * bytes that must be transferred for this 922 * command. Provided a sense condition is not 923 * present, make sure the actual amount 924 * transferred is at least the underflow value 925 * or fail. 926 */ 927 if (!(flags & FCP_SNS_LEN_VAL) && 928 (fc_rp->fr_status == 0) && 929 (scsi_bufflen(fsp->cmd) - 930 fsp->scsi_resid) < fsp->cmd->underflow) 931 goto err; 932 expected_len -= fsp->scsi_resid; 933 } else { 934 fsp->status_code = FC_ERROR; 935 } 936 } 937 } 938 fsp->state |= FC_SRB_RCV_STATUS; 939 940 /* 941 * Check for missing or extra data frames. 942 */ 943 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && 944 fsp->xfer_len != expected_len)) { 945 if (fsp->xfer_len < expected_len) { 946 /* 947 * Some data may be queued locally, 948 * Wait a at least one jiffy to see if it is delivered. 949 * If this expires without data, we may do SRR. 950 */ 951 if (fsp->lp->qfull) { 952 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n", 953 fsp->rport->port_id); 954 return; 955 } 956 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun " 957 "len %x, data len %x\n", 958 fsp->rport->port_id, 959 fsp->xfer_len, expected_len, fsp->data_len); 960 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 961 return; 962 } 963 fsp->status_code = FC_DATA_OVRRUN; 964 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " 965 "len %x, data len %x\n", 966 fsp->rport->port_id, 967 fsp->xfer_len, expected_len, fsp->data_len); 968 } 969 fc_fcp_complete_locked(fsp); 970 return; 971 972len_err: 973 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " 974 "snsl %u\n", flags, fr_len(fp), respl, snsl); 975err: 976 fsp->status_code = FC_ERROR; 977 fc_fcp_complete_locked(fsp); 978} 979 980/** 981 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the 982 * fcp_pkt lock held 983 * @fsp: The FCP packet to be completed 984 * 985 * This function may sleep if a timer is pending. The packet lock must be 986 * held, and the host lock must not be held. 987 */ 988static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) 989{ 990 struct fc_lport *lport = fsp->lp; 991 struct fc_seq *seq; 992 struct fc_exch *ep; 993 u32 f_ctl; 994 995 if (fsp->state & FC_SRB_ABORT_PENDING) 996 return; 997 998 if (fsp->state & FC_SRB_ABORTED) { 999 if (!fsp->status_code) 1000 fsp->status_code = FC_CMD_ABORTED; 1001 } else { 1002 /* 1003 * Test for transport underrun, independent of response 1004 * underrun status. 1005 */ 1006 if (fsp->cdb_status == SAM_STAT_GOOD && 1007 fsp->xfer_len < fsp->data_len && !fsp->io_status && 1008 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || 1009 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { 1010 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n", 1011 fsp->xfer_len, fsp->data_len); 1012 fsp->status_code = FC_DATA_UNDRUN; 1013 } 1014 } 1015 1016 seq = fsp->seq_ptr; 1017 if (seq) { 1018 fsp->seq_ptr = NULL; 1019 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { 1020 struct fc_frame *conf_frame; 1021 struct fc_seq *csp; 1022 1023 csp = fc_seq_start_next(seq); 1024 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); 1025 if (conf_frame) { 1026 f_ctl = FC_FC_SEQ_INIT; 1027 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; 1028 ep = fc_seq_exch(seq); 1029 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, 1030 ep->did, ep->sid, 1031 FC_TYPE_FCP, f_ctl, 0); 1032 fc_seq_send(lport, csp, conf_frame); 1033 } 1034 } 1035 fc_exch_done(seq); 1036 } 1037 /* 1038 * Some resets driven by SCSI are not I/Os and do not have 1039 * SCSI commands associated with the requests. We should not 1040 * call I/O completion if we do not have a SCSI command. 1041 */ 1042 if (fsp->cmd) 1043 fc_io_compl(fsp); 1044} 1045 1046/** 1047 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt 1048 * @fsp: The FCP packet whose exchanges should be canceled 1049 * @error: The reason for the cancellation 1050 */ 1051static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) 1052{ 1053 if (fsp->seq_ptr) { 1054 fc_exch_done(fsp->seq_ptr); 1055 fsp->seq_ptr = NULL; 1056 } 1057 fsp->status_code = error; 1058} 1059 1060/** 1061 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port 1062 * @lport: The local port whose exchanges should be canceled 1063 * @id: The target's ID 1064 * @lun: The LUN 1065 * @error: The reason for cancellation 1066 * 1067 * If lun or id is -1, they are ignored. 1068 */ 1069static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, 1070 unsigned int lun, int error) 1071{ 1072 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1073 struct fc_fcp_pkt *fsp; 1074 struct scsi_cmnd *sc_cmd; 1075 unsigned long flags; 1076 1077 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1078restart: 1079 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { 1080 sc_cmd = fsp->cmd; 1081 if (id != -1 && scmd_id(sc_cmd) != id) 1082 continue; 1083 1084 if (lun != -1 && sc_cmd->device->lun != lun) 1085 continue; 1086 1087 fc_fcp_pkt_hold(fsp); 1088 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1089 1090 spin_lock_bh(&fsp->scsi_pkt_lock); 1091 if (!(fsp->state & FC_SRB_COMPL)) { 1092 fsp->state |= FC_SRB_COMPL; 1093 /* 1094 * TODO: dropping scsi_pkt_lock and then reacquiring 1095 * again around fc_fcp_cleanup_cmd() is required, 1096 * since fc_fcp_cleanup_cmd() calls into 1097 * fc_seq_set_resp() and that func preempts cpu using 1098 * schedule. May be schedule and related code should be 1099 * removed instead of unlocking here to avoid scheduling 1100 * while atomic bug. 1101 */ 1102 spin_unlock_bh(&fsp->scsi_pkt_lock); 1103 1104 fc_fcp_cleanup_cmd(fsp, error); 1105 1106 spin_lock_bh(&fsp->scsi_pkt_lock); 1107 fc_io_compl(fsp); 1108 } 1109 spin_unlock_bh(&fsp->scsi_pkt_lock); 1110 1111 fc_fcp_pkt_release(fsp); 1112 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1113 /* 1114 * while we dropped the lock multiple pkts could 1115 * have been released, so we have to start over. 1116 */ 1117 goto restart; 1118 } 1119 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1120} 1121 1122/** 1123 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port 1124 * @lport: The local port whose exchanges are to be aborted 1125 */ 1126static void fc_fcp_abort_io(struct fc_lport *lport) 1127{ 1128 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); 1129} 1130 1131/** 1132 * fc_fcp_pkt_send() - Send a fcp_pkt 1133 * @lport: The local port to send the FCP packet on 1134 * @fsp: The FCP packet to send 1135 * 1136 * Return: Zero for success and -1 for failure 1137 * Locks: Called without locks held 1138 */ 1139static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 1140{ 1141 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 1142 unsigned long flags; 1143 int rc; 1144 1145 fsp->cmd->SCp.ptr = (char *)fsp; 1146 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1147 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; 1148 1149 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); 1150 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); 1151 1152 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1153 list_add_tail(&fsp->list, &si->scsi_pkt_queue); 1154 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1155 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); 1156 if (unlikely(rc)) { 1157 spin_lock_irqsave(&si->scsi_queue_lock, flags); 1158 fsp->cmd->SCp.ptr = NULL; 1159 list_del(&fsp->list); 1160 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 1161 } 1162 1163 return rc; 1164} 1165 1166/** 1167 * fc_fcp_cmd_send() - Send a FCP command 1168 * @lport: The local port to send the command on 1169 * @fsp: The FCP packet the command is on 1170 * @resp: The handler for the response 1171 */ 1172static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1173 void (*resp)(struct fc_seq *, 1174 struct fc_frame *fp, 1175 void *arg)) 1176{ 1177 struct fc_frame *fp; 1178 struct fc_seq *seq; 1179 struct fc_rport *rport; 1180 struct fc_rport_libfc_priv *rpriv; 1181 const size_t len = sizeof(fsp->cdb_cmd); 1182 int rc = 0; 1183 1184 if (fc_fcp_lock_pkt(fsp)) 1185 return 0; 1186 1187 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); 1188 if (!fp) { 1189 rc = -1; 1190 goto unlock; 1191 } 1192 1193 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); 1194 fr_fsp(fp) = fsp; 1195 rport = fsp->rport; 1196 fsp->max_payload = rport->maxframe_size; 1197 rpriv = rport->dd_data; 1198 1199 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, 1200 rpriv->local_port->port_id, FC_TYPE_FCP, 1201 FC_FCTL_REQ, 0); 1202 1203 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0); 1204 if (!seq) { 1205 rc = -1; 1206 goto unlock; 1207 } 1208 fsp->seq_ptr = seq; 1209 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ 1210 1211 fsp->timer.function = fc_fcp_timeout; 1212 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1213 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1214 1215unlock: 1216 fc_fcp_unlock_pkt(fsp); 1217 return rc; 1218} 1219 1220/** 1221 * fc_fcp_error() - Handler for FCP layer errors 1222 * @fsp: The FCP packet the error is on 1223 * @fp: The frame that has errored 1224 */ 1225static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1226{ 1227 int error = PTR_ERR(fp); 1228 1229 if (fc_fcp_lock_pkt(fsp)) 1230 return; 1231 1232 if (error == -FC_EX_CLOSED) { 1233 fc_fcp_retry_cmd(fsp, FC_ERROR); 1234 goto unlock; 1235 } 1236 1237 /* 1238 * clear abort pending, because the lower layer 1239 * decided to force completion. 1240 */ 1241 fsp->state &= ~FC_SRB_ABORT_PENDING; 1242 fsp->status_code = FC_CMD_PLOGO; 1243 fc_fcp_complete_locked(fsp); 1244unlock: 1245 fc_fcp_unlock_pkt(fsp); 1246} 1247 1248/** 1249 * fc_fcp_pkt_abort() - Abort a fcp_pkt 1250 * @fsp: The FCP packet to abort on 1251 * 1252 * Called to send an abort and then wait for abort completion 1253 */ 1254static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) 1255{ 1256 int rc = FAILED; 1257 unsigned long ticks_left; 1258 1259 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state); 1260 if (fc_fcp_send_abort(fsp)) { 1261 FC_FCP_DBG(fsp, "failed to send abort\n"); 1262 return FAILED; 1263 } 1264 1265 if (fsp->state & FC_SRB_ABORTED) { 1266 FC_FCP_DBG(fsp, "target abort cmd completed\n"); 1267 return SUCCESS; 1268 } 1269 1270 init_completion(&fsp->tm_done); 1271 fsp->wait_for_comp = 1; 1272 1273 spin_unlock_bh(&fsp->scsi_pkt_lock); 1274 ticks_left = wait_for_completion_timeout(&fsp->tm_done, 1275 FC_SCSI_TM_TOV); 1276 spin_lock_bh(&fsp->scsi_pkt_lock); 1277 fsp->wait_for_comp = 0; 1278 1279 if (!ticks_left) { 1280 FC_FCP_DBG(fsp, "target abort cmd failed\n"); 1281 } else if (fsp->state & FC_SRB_ABORTED) { 1282 FC_FCP_DBG(fsp, "target abort cmd passed\n"); 1283 rc = SUCCESS; 1284 fc_fcp_complete_locked(fsp); 1285 } 1286 1287 return rc; 1288} 1289 1290/** 1291 * fc_lun_reset_send() - Send LUN reset command 1292 * @t: Timer context used to fetch the FSP packet 1293 */ 1294static void fc_lun_reset_send(struct timer_list *t) 1295{ 1296 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); 1297 struct fc_lport *lport = fsp->lp; 1298 1299 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { 1300 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) 1301 return; 1302 if (fc_fcp_lock_pkt(fsp)) 1303 return; 1304 fsp->timer.function = fc_lun_reset_send; 1305 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1306 fc_fcp_unlock_pkt(fsp); 1307 } 1308} 1309 1310/** 1311 * fc_lun_reset() - Send a LUN RESET command to a device 1312 * and wait for the reply 1313 * @lport: The local port to sent the command on 1314 * @fsp: The FCP packet that identifies the LUN to be reset 1315 * @id: The SCSI command ID 1316 * @lun: The LUN ID to be reset 1317 */ 1318static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 1319 unsigned int id, unsigned int lun) 1320{ 1321 int rc; 1322 1323 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); 1324 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; 1325 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); 1326 1327 fsp->wait_for_comp = 1; 1328 init_completion(&fsp->tm_done); 1329 1330 fc_lun_reset_send(&fsp->timer); 1331 1332 /* 1333 * wait for completion of reset 1334 * after that make sure all commands are terminated 1335 */ 1336 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); 1337 1338 spin_lock_bh(&fsp->scsi_pkt_lock); 1339 fsp->state |= FC_SRB_COMPL; 1340 spin_unlock_bh(&fsp->scsi_pkt_lock); 1341 1342 del_timer_sync(&fsp->timer); 1343 1344 spin_lock_bh(&fsp->scsi_pkt_lock); 1345 if (fsp->seq_ptr) { 1346 fc_exch_done(fsp->seq_ptr); 1347 fsp->seq_ptr = NULL; 1348 } 1349 fsp->wait_for_comp = 0; 1350 spin_unlock_bh(&fsp->scsi_pkt_lock); 1351 1352 if (!rc) { 1353 FC_SCSI_DBG(lport, "lun reset failed\n"); 1354 return FAILED; 1355 } 1356 1357 /* cdb_status holds the tmf's rsp code */ 1358 if (fsp->cdb_status != FCP_TMF_CMPL) 1359 return FAILED; 1360 1361 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); 1362 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); 1363 return SUCCESS; 1364} 1365 1366/** 1367 * fc_tm_done() - Task Management response handler 1368 * @seq: The sequence that the response is on 1369 * @fp: The response frame 1370 * @arg: The FCP packet the response is for 1371 */ 1372static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1373{ 1374 struct fc_fcp_pkt *fsp = arg; 1375 struct fc_frame_header *fh; 1376 1377 if (IS_ERR(fp)) { 1378 /* 1379 * If there is an error just let it timeout or wait 1380 * for TMF to be aborted if it timedout. 1381 * 1382 * scsi-eh will escalate for when either happens. 1383 */ 1384 return; 1385 } 1386 1387 if (fc_fcp_lock_pkt(fsp)) 1388 goto out; 1389 1390 /* 1391 * raced with eh timeout handler. 1392 */ 1393 if (!fsp->seq_ptr || !fsp->wait_for_comp) 1394 goto out_unlock; 1395 1396 fh = fc_frame_header_get(fp); 1397 if (fh->fh_type != FC_TYPE_BLS) 1398 fc_fcp_resp(fsp, fp); 1399 fsp->seq_ptr = NULL; 1400 fc_exch_done(seq); 1401out_unlock: 1402 fc_fcp_unlock_pkt(fsp); 1403out: 1404 fc_frame_free(fp); 1405} 1406 1407/** 1408 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port 1409 * @lport: The local port to be cleaned up 1410 */ 1411static void fc_fcp_cleanup(struct fc_lport *lport) 1412{ 1413 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); 1414} 1415 1416/** 1417 * fc_fcp_timeout() - Handler for fcp_pkt timeouts 1418 * @t: Timer context used to fetch the FSP packet 1419 * 1420 * If REC is supported then just issue it and return. The REC exchange will 1421 * complete or time out and recovery can continue at that point. Otherwise, 1422 * if the response has been received without all the data it has been 1423 * ER_TIMEOUT since the response was received. If the response has not been 1424 * received we see if data was received recently. If it has been then we 1425 * continue waiting, otherwise, we abort the command. 1426 */ 1427static void fc_fcp_timeout(struct timer_list *t) 1428{ 1429 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); 1430 struct fc_rport *rport = fsp->rport; 1431 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 1432 1433 if (fc_fcp_lock_pkt(fsp)) 1434 return; 1435 1436 if (fsp->cdb_cmd.fc_tm_flags) 1437 goto unlock; 1438 1439 if (fsp->lp->qfull) { 1440 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n", 1441 fsp->timer_delay); 1442 fsp->timer.function = fc_fcp_timeout; 1443 fc_fcp_timer_set(fsp, fsp->timer_delay); 1444 goto unlock; 1445 } 1446 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n", 1447 fsp->timer_delay, rpriv->flags, fsp->state); 1448 fsp->state |= FC_SRB_FCP_PROCESSING_TMO; 1449 1450 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) 1451 fc_fcp_rec(fsp); 1452 else if (fsp->state & FC_SRB_RCV_STATUS) 1453 fc_fcp_complete_locked(fsp); 1454 else 1455 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1456 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; 1457unlock: 1458 fc_fcp_unlock_pkt(fsp); 1459} 1460 1461/** 1462 * fc_fcp_rec() - Send a REC ELS request 1463 * @fsp: The FCP packet to send the REC request on 1464 */ 1465static void fc_fcp_rec(struct fc_fcp_pkt *fsp) 1466{ 1467 struct fc_lport *lport; 1468 struct fc_frame *fp; 1469 struct fc_rport *rport; 1470 struct fc_rport_libfc_priv *rpriv; 1471 1472 lport = fsp->lp; 1473 rport = fsp->rport; 1474 rpriv = rport->dd_data; 1475 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { 1476 fsp->status_code = FC_HRD_ERROR; 1477 fsp->io_status = 0; 1478 fc_fcp_complete_locked(fsp); 1479 return; 1480 } 1481 1482 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); 1483 if (!fp) 1484 goto retry; 1485 1486 fr_seq(fp) = fsp->seq_ptr; 1487 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, 1488 rpriv->local_port->port_id, FC_TYPE_ELS, 1489 FC_FCTL_REQ, 0); 1490 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, 1491 fc_fcp_rec_resp, fsp, 1492 2 * lport->r_a_tov)) { 1493 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ 1494 return; 1495 } 1496retry: 1497 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1498 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1499 else 1500 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1501} 1502 1503/** 1504 * fc_fcp_rec_resp() - Handler for REC ELS responses 1505 * @seq: The sequence the response is on 1506 * @fp: The response frame 1507 * @arg: The FCP packet the response is on 1508 * 1509 * If the response is a reject then the scsi layer will handle 1510 * the timeout. If the response is a LS_ACC then if the I/O was not completed 1511 * set the timeout and return. If the I/O was completed then complete the 1512 * exchange and tell the SCSI layer. 1513 */ 1514static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1515{ 1516 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; 1517 struct fc_els_rec_acc *recp; 1518 struct fc_els_ls_rjt *rjt; 1519 u32 e_stat; 1520 u8 opcode; 1521 u32 offset; 1522 enum dma_data_direction data_dir; 1523 enum fc_rctl r_ctl; 1524 struct fc_rport_libfc_priv *rpriv; 1525 1526 if (IS_ERR(fp)) { 1527 fc_fcp_rec_error(fsp, fp); 1528 return; 1529 } 1530 1531 if (fc_fcp_lock_pkt(fsp)) 1532 goto out; 1533 1534 fsp->recov_retry = 0; 1535 opcode = fc_frame_payload_op(fp); 1536 if (opcode == ELS_LS_RJT) { 1537 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1538 switch (rjt->er_reason) { 1539 default: 1540 FC_FCP_DBG(fsp, 1541 "device %x invalid REC reject %d/%d\n", 1542 fsp->rport->port_id, rjt->er_reason, 1543 rjt->er_explan); 1544 fallthrough; 1545 case ELS_RJT_UNSUP: 1546 FC_FCP_DBG(fsp, "device does not support REC\n"); 1547 rpriv = fsp->rport->dd_data; 1548 /* 1549 * if we do not spport RECs or got some bogus 1550 * reason then resetup timer so we check for 1551 * making progress. 1552 */ 1553 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; 1554 break; 1555 case ELS_RJT_LOGIC: 1556 case ELS_RJT_UNAB: 1557 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n", 1558 fsp->rport->port_id, rjt->er_reason, 1559 rjt->er_explan); 1560 /* 1561 * If response got lost or is stuck in the 1562 * queue somewhere we have no idea if and when 1563 * the response will be received. So quarantine 1564 * the xid and retry the command. 1565 */ 1566 if (rjt->er_explan == ELS_EXPL_OXID_RXID) { 1567 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1568 ep->state |= FC_EX_QUARANTINE; 1569 fsp->state |= FC_SRB_ABORTED; 1570 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1571 break; 1572 } 1573 fc_fcp_recovery(fsp, FC_TRANS_RESET); 1574 break; 1575 } 1576 } else if (opcode == ELS_LS_ACC) { 1577 if (fsp->state & FC_SRB_ABORTED) 1578 goto unlock_out; 1579 1580 data_dir = fsp->cmd->sc_data_direction; 1581 recp = fc_frame_payload_get(fp, sizeof(*recp)); 1582 offset = ntohl(recp->reca_fc4value); 1583 e_stat = ntohl(recp->reca_e_stat); 1584 1585 if (e_stat & ESB_ST_COMPLETE) { 1586 1587 /* 1588 * The exchange is complete. 1589 * 1590 * For output, we must've lost the response. 1591 * For input, all data must've been sent. 1592 * We lost may have lost the response 1593 * (and a confirmation was requested) and maybe 1594 * some data. 1595 * 1596 * If all data received, send SRR 1597 * asking for response. If partial data received, 1598 * or gaps, SRR requests data at start of gap. 1599 * Recovery via SRR relies on in-order-delivery. 1600 */ 1601 if (data_dir == DMA_TO_DEVICE) { 1602 r_ctl = FC_RCTL_DD_CMD_STATUS; 1603 } else if (fsp->xfer_contig_end == offset) { 1604 r_ctl = FC_RCTL_DD_CMD_STATUS; 1605 } else { 1606 offset = fsp->xfer_contig_end; 1607 r_ctl = FC_RCTL_DD_SOL_DATA; 1608 } 1609 fc_fcp_srr(fsp, r_ctl, offset); 1610 } else if (e_stat & ESB_ST_SEQ_INIT) { 1611 /* 1612 * The remote port has the initiative, so just 1613 * keep waiting for it to complete. 1614 */ 1615 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1616 } else { 1617 1618 /* 1619 * The exchange is incomplete, we have seq. initiative. 1620 * Lost response with requested confirmation, 1621 * lost confirmation, lost transfer ready or 1622 * lost write data. 1623 * 1624 * For output, if not all data was received, ask 1625 * for transfer ready to be repeated. 1626 * 1627 * If we received or sent all the data, send SRR to 1628 * request response. 1629 * 1630 * If we lost a response, we may have lost some read 1631 * data as well. 1632 */ 1633 r_ctl = FC_RCTL_DD_SOL_DATA; 1634 if (data_dir == DMA_TO_DEVICE) { 1635 r_ctl = FC_RCTL_DD_CMD_STATUS; 1636 if (offset < fsp->data_len) 1637 r_ctl = FC_RCTL_DD_DATA_DESC; 1638 } else if (offset == fsp->xfer_contig_end) { 1639 r_ctl = FC_RCTL_DD_CMD_STATUS; 1640 } else if (fsp->xfer_contig_end < offset) { 1641 offset = fsp->xfer_contig_end; 1642 } 1643 fc_fcp_srr(fsp, r_ctl, offset); 1644 } 1645 } 1646unlock_out: 1647 fc_fcp_unlock_pkt(fsp); 1648out: 1649 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1650 fc_frame_free(fp); 1651} 1652 1653/** 1654 * fc_fcp_rec_error() - Handler for REC errors 1655 * @fsp: The FCP packet the error is on 1656 * @fp: The REC frame 1657 */ 1658static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1659{ 1660 int error = PTR_ERR(fp); 1661 1662 if (fc_fcp_lock_pkt(fsp)) 1663 goto out; 1664 1665 switch (error) { 1666 case -FC_EX_CLOSED: 1667 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n", 1668 fsp, fsp->rport->port_id); 1669 fc_fcp_retry_cmd(fsp, FC_ERROR); 1670 break; 1671 1672 default: 1673 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", 1674 fsp, fsp->rport->port_id, error); 1675 fsp->status_code = FC_CMD_PLOGO; 1676 fallthrough; 1677 1678 case -FC_EX_TIMEOUT: 1679 /* 1680 * Assume REC or LS_ACC was lost. 1681 * The exchange manager will have aborted REC, so retry. 1682 */ 1683 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n", 1684 fsp, fsp->rport->port_id, fsp->recov_retry, 1685 FC_MAX_RECOV_RETRY); 1686 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1687 fc_fcp_rec(fsp); 1688 else 1689 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1690 break; 1691 } 1692 fc_fcp_unlock_pkt(fsp); 1693out: 1694 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ 1695} 1696 1697/** 1698 * fc_fcp_recovery() - Handler for fcp_pkt recovery 1699 * @fsp: The FCP pkt that needs to be aborted 1700 * @code: The FCP status code to set 1701 */ 1702static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) 1703{ 1704 FC_FCP_DBG(fsp, "start recovery code %x\n", code); 1705 fsp->status_code = code; 1706 fsp->cdb_status = 0; 1707 fsp->io_status = 0; 1708 if (!fsp->cmd) 1709 /* 1710 * Only abort non-scsi commands; otherwise let the 1711 * scsi command timer fire and scsi-ml escalate. 1712 */ 1713 fc_fcp_send_abort(fsp); 1714} 1715 1716/** 1717 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) 1718 * @fsp: The FCP packet the SRR is to be sent on 1719 * @r_ctl: The R_CTL field for the SRR request 1720 * @offset: The SRR relative offset 1721 * This is called after receiving status but insufficient data, or 1722 * when expecting status but the request has timed out. 1723 */ 1724static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) 1725{ 1726 struct fc_lport *lport = fsp->lp; 1727 struct fc_rport *rport; 1728 struct fc_rport_libfc_priv *rpriv; 1729 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); 1730 struct fc_seq *seq; 1731 struct fcp_srr *srr; 1732 struct fc_frame *fp; 1733 1734 rport = fsp->rport; 1735 rpriv = rport->dd_data; 1736 1737 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || 1738 rpriv->rp_state != RPORT_ST_READY) 1739 goto retry; /* shouldn't happen */ 1740 fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); 1741 if (!fp) 1742 goto retry; 1743 1744 srr = fc_frame_payload_get(fp, sizeof(*srr)); 1745 memset(srr, 0, sizeof(*srr)); 1746 srr->srr_op = ELS_SRR; 1747 srr->srr_ox_id = htons(ep->oxid); 1748 srr->srr_rx_id = htons(ep->rxid); 1749 srr->srr_r_ctl = r_ctl; 1750 srr->srr_rel_off = htonl(offset); 1751 1752 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, 1753 rpriv->local_port->port_id, FC_TYPE_FCP, 1754 FC_FCTL_REQ, 0); 1755 1756 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp, 1757 fc_fcp_pkt_destroy, 1758 fsp, get_fsp_rec_tov(fsp)); 1759 if (!seq) 1760 goto retry; 1761 1762 fsp->recov_seq = seq; 1763 fsp->xfer_len = offset; 1764 fsp->xfer_contig_end = offset; 1765 fsp->state &= ~FC_SRB_RCV_STATUS; 1766 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ 1767 return; 1768retry: 1769 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); 1770} 1771 1772/** 1773 * fc_fcp_srr_resp() - Handler for SRR response 1774 * @seq: The sequence the SRR is on 1775 * @fp: The SRR frame 1776 * @arg: The FCP packet the SRR is on 1777 */ 1778static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 1779{ 1780 struct fc_fcp_pkt *fsp = arg; 1781 struct fc_frame_header *fh; 1782 1783 if (IS_ERR(fp)) { 1784 fc_fcp_srr_error(fsp, fp); 1785 return; 1786 } 1787 1788 if (fc_fcp_lock_pkt(fsp)) 1789 goto out; 1790 1791 fh = fc_frame_header_get(fp); 1792 /* 1793 * BUG? fc_fcp_srr_error calls fc_exch_done which would release 1794 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, 1795 * then fc_exch_timeout would be sending an abort. The fc_exch_done 1796 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing 1797 * an abort response though. 1798 */ 1799 if (fh->fh_type == FC_TYPE_BLS) { 1800 fc_fcp_unlock_pkt(fsp); 1801 return; 1802 } 1803 1804 switch (fc_frame_payload_op(fp)) { 1805 case ELS_LS_ACC: 1806 fsp->recov_retry = 0; 1807 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); 1808 break; 1809 case ELS_LS_RJT: 1810 default: 1811 fc_fcp_recovery(fsp, FC_ERROR); 1812 break; 1813 } 1814 fc_fcp_unlock_pkt(fsp); 1815out: 1816 fc_exch_done(seq); 1817 fc_frame_free(fp); 1818} 1819 1820/** 1821 * fc_fcp_srr_error() - Handler for SRR errors 1822 * @fsp: The FCP packet that the SRR error is on 1823 * @fp: The SRR frame 1824 */ 1825static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) 1826{ 1827 if (fc_fcp_lock_pkt(fsp)) 1828 goto out; 1829 switch (PTR_ERR(fp)) { 1830 case -FC_EX_TIMEOUT: 1831 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry); 1832 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) 1833 fc_fcp_rec(fsp); 1834 else 1835 fc_fcp_recovery(fsp, FC_TIMED_OUT); 1836 break; 1837 case -FC_EX_CLOSED: /* e.g., link failure */ 1838 FC_FCP_DBG(fsp, "SRR error, exchange closed\n"); 1839 fallthrough; 1840 default: 1841 fc_fcp_retry_cmd(fsp, FC_ERROR); 1842 break; 1843 } 1844 fc_fcp_unlock_pkt(fsp); 1845out: 1846 fc_exch_done(fsp->recov_seq); 1847} 1848 1849/** 1850 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready 1851 * @lport: The local port to be checked 1852 */ 1853static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) 1854{ 1855 /* lock ? */ 1856 return (lport->state == LPORT_ST_READY) && 1857 lport->link_up && !lport->qfull; 1858} 1859 1860/** 1861 * fc_queuecommand() - The queuecommand function of the SCSI template 1862 * @shost: The Scsi_Host that the command was issued to 1863 * @sc_cmd: The scsi_cmnd to be executed 1864 * 1865 * This is the i/o strategy routine, called by the SCSI layer. 1866 */ 1867int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) 1868{ 1869 struct fc_lport *lport = shost_priv(shost); 1870 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 1871 struct fc_fcp_pkt *fsp; 1872 int rval; 1873 int rc = 0; 1874 struct fc_stats *stats; 1875 1876 rval = fc_remote_port_chkready(rport); 1877 if (rval) { 1878 sc_cmd->result = rval; 1879 sc_cmd->scsi_done(sc_cmd); 1880 return 0; 1881 } 1882 1883 if (!*(struct fc_remote_port **)rport->dd_data) { 1884 /* 1885 * rport is transitioning from blocked/deleted to 1886 * online 1887 */ 1888 sc_cmd->result = DID_IMM_RETRY << 16; 1889 sc_cmd->scsi_done(sc_cmd); 1890 goto out; 1891 } 1892 1893 if (!fc_fcp_lport_queue_ready(lport)) { 1894 if (lport->qfull) { 1895 if (fc_fcp_can_queue_ramp_down(lport)) 1896 shost_printk(KERN_ERR, lport->host, 1897 "libfc: queue full, " 1898 "reducing can_queue to %d.\n", 1899 lport->host->can_queue); 1900 } 1901 rc = SCSI_MLQUEUE_HOST_BUSY; 1902 goto out; 1903 } 1904 1905 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); 1906 if (fsp == NULL) { 1907 rc = SCSI_MLQUEUE_HOST_BUSY; 1908 goto out; 1909 } 1910 1911 /* 1912 * build the libfc request pkt 1913 */ 1914 fsp->cmd = sc_cmd; /* save the cmd */ 1915 fsp->rport = rport; /* set the remote port ptr */ 1916 1917 /* 1918 * set up the transfer length 1919 */ 1920 fsp->data_len = scsi_bufflen(sc_cmd); 1921 fsp->xfer_len = 0; 1922 1923 /* 1924 * setup the data direction 1925 */ 1926 stats = per_cpu_ptr(lport->stats, get_cpu()); 1927 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { 1928 fsp->req_flags = FC_SRB_READ; 1929 stats->InputRequests++; 1930 stats->InputBytes += fsp->data_len; 1931 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { 1932 fsp->req_flags = FC_SRB_WRITE; 1933 stats->OutputRequests++; 1934 stats->OutputBytes += fsp->data_len; 1935 } else { 1936 fsp->req_flags = 0; 1937 stats->ControlRequests++; 1938 } 1939 put_cpu(); 1940 1941 /* 1942 * send it to the lower layer 1943 * if we get -1 return then put the request in the pending 1944 * queue. 1945 */ 1946 rval = fc_fcp_pkt_send(lport, fsp); 1947 if (rval != 0) { 1948 fsp->state = FC_SRB_FREE; 1949 fc_fcp_pkt_release(fsp); 1950 rc = SCSI_MLQUEUE_HOST_BUSY; 1951 } 1952out: 1953 return rc; 1954} 1955EXPORT_SYMBOL(fc_queuecommand); 1956 1957/** 1958 * fc_io_compl() - Handle responses for completed commands 1959 * @fsp: The FCP packet that is complete 1960 * 1961 * Translates fcp_pkt errors to a Linux SCSI errors. 1962 * The fcp packet lock must be held when calling. 1963 */ 1964static void fc_io_compl(struct fc_fcp_pkt *fsp) 1965{ 1966 struct fc_fcp_internal *si; 1967 struct scsi_cmnd *sc_cmd; 1968 struct fc_lport *lport; 1969 unsigned long flags; 1970 1971 /* release outstanding ddp context */ 1972 fc_fcp_ddp_done(fsp); 1973 1974 fsp->state |= FC_SRB_COMPL; 1975 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { 1976 spin_unlock_bh(&fsp->scsi_pkt_lock); 1977 del_timer_sync(&fsp->timer); 1978 spin_lock_bh(&fsp->scsi_pkt_lock); 1979 } 1980 1981 lport = fsp->lp; 1982 si = fc_get_scsi_internal(lport); 1983 1984 /* 1985 * if can_queue ramp down is done then try can_queue ramp up 1986 * since commands are completing now. 1987 */ 1988 if (si->last_can_queue_ramp_down_time) 1989 fc_fcp_can_queue_ramp_up(lport); 1990 1991 sc_cmd = fsp->cmd; 1992 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; 1993 switch (fsp->status_code) { 1994 case FC_COMPLETE: 1995 if (fsp->cdb_status == 0) { 1996 /* 1997 * good I/O status 1998 */ 1999 sc_cmd->result = DID_OK << 16; 2000 if (fsp->scsi_resid) 2001 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 2002 } else { 2003 /* 2004 * transport level I/O was ok but scsi 2005 * has non zero status 2006 */ 2007 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; 2008 } 2009 break; 2010 case FC_ERROR: 2011 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2012 "due to FC_ERROR\n"); 2013 sc_cmd->result = DID_ERROR << 16; 2014 break; 2015 case FC_DATA_UNDRUN: 2016 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { 2017 /* 2018 * scsi status is good but transport level 2019 * underrun. 2020 */ 2021 if (fsp->state & FC_SRB_RCV_STATUS) { 2022 sc_cmd->result = DID_OK << 16; 2023 } else { 2024 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" 2025 " due to FC_DATA_UNDRUN (trans)\n"); 2026 sc_cmd->result = DID_ERROR << 16; 2027 } 2028 } else { 2029 /* 2030 * scsi got underrun, this is an error 2031 */ 2032 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2033 "due to FC_DATA_UNDRUN (scsi)\n"); 2034 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; 2035 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2036 } 2037 break; 2038 case FC_DATA_OVRRUN: 2039 /* 2040 * overrun is an error 2041 */ 2042 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2043 "due to FC_DATA_OVRRUN\n"); 2044 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; 2045 break; 2046 case FC_CMD_ABORTED: 2047 if (host_byte(sc_cmd->result) == DID_TIME_OUT) 2048 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " 2049 "due to FC_CMD_ABORTED\n"); 2050 else { 2051 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2052 "due to FC_CMD_ABORTED\n"); 2053 set_host_byte(sc_cmd, DID_ERROR); 2054 } 2055 sc_cmd->result |= fsp->io_status; 2056 break; 2057 case FC_CMD_RESET: 2058 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " 2059 "due to FC_CMD_RESET\n"); 2060 sc_cmd->result = (DID_RESET << 16); 2061 break; 2062 case FC_TRANS_RESET: 2063 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml " 2064 "due to FC_TRANS_RESET\n"); 2065 sc_cmd->result = (DID_SOFT_ERROR << 16); 2066 break; 2067 case FC_HRD_ERROR: 2068 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " 2069 "due to FC_HRD_ERROR\n"); 2070 sc_cmd->result = (DID_NO_CONNECT << 16); 2071 break; 2072 case FC_CRC_ERROR: 2073 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " 2074 "due to FC_CRC_ERROR\n"); 2075 sc_cmd->result = (DID_PARITY << 16); 2076 break; 2077 case FC_TIMED_OUT: 2078 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " 2079 "due to FC_TIMED_OUT\n"); 2080 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; 2081 break; 2082 default: 2083 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " 2084 "due to unknown error\n"); 2085 sc_cmd->result = (DID_ERROR << 16); 2086 break; 2087 } 2088 2089 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) 2090 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); 2091 2092 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2093 list_del(&fsp->list); 2094 sc_cmd->SCp.ptr = NULL; 2095 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2096 sc_cmd->scsi_done(sc_cmd); 2097 2098 /* release ref from initial allocation in queue command */ 2099 fc_fcp_pkt_release(fsp); 2100} 2101 2102/** 2103 * fc_eh_abort() - Abort a command 2104 * @sc_cmd: The SCSI command to abort 2105 * 2106 * From SCSI host template. 2107 * Send an ABTS to the target device and wait for the response. 2108 */ 2109int fc_eh_abort(struct scsi_cmnd *sc_cmd) 2110{ 2111 struct fc_fcp_pkt *fsp; 2112 struct fc_lport *lport; 2113 struct fc_fcp_internal *si; 2114 int rc = FAILED; 2115 unsigned long flags; 2116 int rval; 2117 2118 rval = fc_block_scsi_eh(sc_cmd); 2119 if (rval) 2120 return rval; 2121 2122 lport = shost_priv(sc_cmd->device->host); 2123 if (lport->state != LPORT_ST_READY) 2124 return rc; 2125 else if (!lport->link_up) 2126 return rc; 2127 2128 si = fc_get_scsi_internal(lport); 2129 spin_lock_irqsave(&si->scsi_queue_lock, flags); 2130 fsp = CMD_SP(sc_cmd); 2131 if (!fsp) { 2132 /* command completed while scsi eh was setting up */ 2133 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2134 return SUCCESS; 2135 } 2136 /* grab a ref so the fsp and sc_cmd cannot be released from under us */ 2137 fc_fcp_pkt_hold(fsp); 2138 spin_unlock_irqrestore(&si->scsi_queue_lock, flags); 2139 2140 if (fc_fcp_lock_pkt(fsp)) { 2141 /* completed while we were waiting for timer to be deleted */ 2142 rc = SUCCESS; 2143 goto release_pkt; 2144 } 2145 2146 rc = fc_fcp_pkt_abort(fsp); 2147 fc_fcp_unlock_pkt(fsp); 2148 2149release_pkt: 2150 fc_fcp_pkt_release(fsp); 2151 return rc; 2152} 2153EXPORT_SYMBOL(fc_eh_abort); 2154 2155/** 2156 * fc_eh_device_reset() - Reset a single LUN 2157 * @sc_cmd: The SCSI command which identifies the device whose 2158 * LUN is to be reset 2159 * 2160 * Set from SCSI host template. 2161 */ 2162int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) 2163{ 2164 struct fc_lport *lport; 2165 struct fc_fcp_pkt *fsp; 2166 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); 2167 int rc = FAILED; 2168 int rval; 2169 2170 rval = fc_block_scsi_eh(sc_cmd); 2171 if (rval) 2172 return rval; 2173 2174 lport = shost_priv(sc_cmd->device->host); 2175 2176 if (lport->state != LPORT_ST_READY) 2177 return rc; 2178 2179 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); 2180 2181 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); 2182 if (fsp == NULL) { 2183 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); 2184 goto out; 2185 } 2186 2187 /* 2188 * Build the libfc request pkt. Do not set the scsi cmnd, because 2189 * the sc passed in is not setup for execution like when sent 2190 * through the queuecommand callout. 2191 */ 2192 fsp->rport = rport; /* set the remote port ptr */ 2193 2194 /* 2195 * flush outstanding commands 2196 */ 2197 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); 2198 fsp->state = FC_SRB_FREE; 2199 fc_fcp_pkt_release(fsp); 2200 2201out: 2202 return rc; 2203} 2204EXPORT_SYMBOL(fc_eh_device_reset); 2205 2206/** 2207 * fc_eh_host_reset() - Reset a Scsi_Host. 2208 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset 2209 */ 2210int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) 2211{ 2212 struct Scsi_Host *shost = sc_cmd->device->host; 2213 struct fc_lport *lport = shost_priv(shost); 2214 unsigned long wait_tmo; 2215 2216 FC_SCSI_DBG(lport, "Resetting host\n"); 2217 2218 fc_lport_reset(lport); 2219 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; 2220 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, 2221 wait_tmo)) 2222 msleep(1000); 2223 2224 if (fc_fcp_lport_queue_ready(lport)) { 2225 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " 2226 "on port (%6.6x)\n", lport->port_id); 2227 return SUCCESS; 2228 } else { 2229 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " 2230 "port (%6.6x) is not ready.\n", 2231 lport->port_id); 2232 return FAILED; 2233 } 2234} 2235EXPORT_SYMBOL(fc_eh_host_reset); 2236 2237/** 2238 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host 2239 * @sdev: The SCSI device that identifies the SCSI host 2240 * 2241 * Configures queue depth based on host's cmd_per_len. If not set 2242 * then we use the libfc default. 2243 */ 2244int fc_slave_alloc(struct scsi_device *sdev) 2245{ 2246 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2247 2248 if (!rport || fc_remote_port_chkready(rport)) 2249 return -ENXIO; 2250 2251 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); 2252 return 0; 2253} 2254EXPORT_SYMBOL(fc_slave_alloc); 2255 2256/** 2257 * fc_fcp_destory() - Tear down the FCP layer for a given local port 2258 * @lport: The local port that no longer needs the FCP layer 2259 */ 2260void fc_fcp_destroy(struct fc_lport *lport) 2261{ 2262 struct fc_fcp_internal *si = fc_get_scsi_internal(lport); 2263 2264 if (!list_empty(&si->scsi_pkt_queue)) 2265 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " 2266 "port (%6.6x)\n", lport->port_id); 2267 2268 mempool_destroy(si->scsi_pkt_pool); 2269 kfree(si); 2270 lport->scsi_priv = NULL; 2271} 2272EXPORT_SYMBOL(fc_fcp_destroy); 2273 2274int fc_setup_fcp(void) 2275{ 2276 int rc = 0; 2277 2278 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", 2279 sizeof(struct fc_fcp_pkt), 2280 0, SLAB_HWCACHE_ALIGN, NULL); 2281 if (!scsi_pkt_cachep) { 2282 printk(KERN_ERR "libfc: Unable to allocate SRB cache, " 2283 "module load failed!"); 2284 rc = -ENOMEM; 2285 } 2286 2287 return rc; 2288} 2289 2290void fc_destroy_fcp(void) 2291{ 2292 kmem_cache_destroy(scsi_pkt_cachep); 2293} 2294 2295/** 2296 * fc_fcp_init() - Initialize the FCP layer for a local port 2297 * @lport: The local port to initialize the exchange layer for 2298 */ 2299int fc_fcp_init(struct fc_lport *lport) 2300{ 2301 int rc; 2302 struct fc_fcp_internal *si; 2303 2304 if (!lport->tt.fcp_cmd_send) 2305 lport->tt.fcp_cmd_send = fc_fcp_cmd_send; 2306 2307 if (!lport->tt.fcp_cleanup) 2308 lport->tt.fcp_cleanup = fc_fcp_cleanup; 2309 2310 if (!lport->tt.fcp_abort_io) 2311 lport->tt.fcp_abort_io = fc_fcp_abort_io; 2312 2313 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); 2314 if (!si) 2315 return -ENOMEM; 2316 lport->scsi_priv = si; 2317 si->max_can_queue = lport->host->can_queue; 2318 INIT_LIST_HEAD(&si->scsi_pkt_queue); 2319 spin_lock_init(&si->scsi_queue_lock); 2320 2321 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); 2322 if (!si->scsi_pkt_pool) { 2323 rc = -ENOMEM; 2324 goto free_internal; 2325 } 2326 return 0; 2327 2328free_internal: 2329 kfree(si); 2330 return rc; 2331} 2332EXPORT_SYMBOL(fc_fcp_init); 2333