1 /* 2 * Copyright 2008 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 * 5 * This program is free software; you may redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; version 2 of the License. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 16 * SOFTWARE. 17 */ 18 #include <linux/mempool.h> 19 #include <linux/errno.h> 20 #include <linux/init.h> 21 #include <linux/workqueue.h> 22 #include <linux/pci.h> 23 #include <linux/scatterlist.h> 24 #include <linux/skbuff.h> 25 #include <linux/spinlock.h> 26 #include <linux/if_ether.h> 27 #include <linux/if_vlan.h> 28 #include <linux/delay.h> 29 #include <linux/gfp.h> 30 #include <scsi/scsi.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_cmnd.h> 34 #include <scsi/scsi_tcq.h> 35 #include <scsi/fc/fc_els.h> 36 #include <scsi/fc/fc_fcoe.h> 37 #include <scsi/libfc.h> 38 #include <scsi/fc_frame.h> 39 #include "fnic_io.h" 40 #include "fnic.h" 41 42 const char *fnic_state_str[] = { 43 [FNIC_IN_FC_MODE] = "FNIC_IN_FC_MODE", 44 [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE", 45 [FNIC_IN_ETH_MODE] = "FNIC_IN_ETH_MODE", 46 [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE", 47 }; 48 49 static const char *fnic_ioreq_state_str[] = { 50 [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED", 51 [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING", 52 [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING", 53 [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE", 54 [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE", 55 }; 56 57 static const char *fcpio_status_str[] = { 58 [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/ 59 [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER", 60 [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE", 61 [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]", 62 [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED", 63 [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND", 64 [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/ 65 [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT", 66 [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID", 67 [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID", 68 [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH", 69 [FCPIO_FW_ERR] = "FCPIO_FW_ERR", 70 [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED", 71 [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED", 72 [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN", 73 [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED", 74 [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL", 75 [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED", 76 [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND", 77 }; 78 79 const char *fnic_state_to_str(unsigned int state) 80 { 81 if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state]) 82 return "unknown"; 83 84 return fnic_state_str[state]; 85 } 86 87 static const char *fnic_ioreq_state_to_str(unsigned int state) 88 { 89 if (state >= ARRAY_SIZE(fnic_ioreq_state_str) || 90 !fnic_ioreq_state_str[state]) 91 return "unknown"; 92 93 return fnic_ioreq_state_str[state]; 94 } 95 96 static const char *fnic_fcpio_status_to_str(unsigned int status) 97 { 98 if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status]) 99 return "unknown"; 100 101 return fcpio_status_str[status]; 102 } 103 104 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id); 105 106 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic, 107 struct scsi_cmnd *sc) 108 { 109 u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1); 110 111 return &fnic->io_req_lock[hash]; 112 } 113 114 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic, 115 int tag) 116 { 117 return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)]; 118 } 119 120 /* 121 * Unmap the data buffer and sense buffer for an io_req, 122 * also unmap and free the device-private scatter/gather list. 123 */ 124 static void fnic_release_ioreq_buf(struct fnic *fnic, 125 struct fnic_io_req *io_req, 126 struct scsi_cmnd *sc) 127 { 128 if (io_req->sgl_list_pa) 129 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa, 130 sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt, 131 PCI_DMA_TODEVICE); 132 scsi_dma_unmap(sc); 133 134 if (io_req->sgl_cnt) 135 mempool_free(io_req->sgl_list_alloc, 136 fnic->io_sgl_pool[io_req->sgl_type]); 137 if (io_req->sense_buf_pa) 138 pci_unmap_single(fnic->pdev, io_req->sense_buf_pa, 139 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); 140 } 141 142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */ 143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq) 144 { 145 /* if no Ack received from firmware, then nothing to clean */ 146 if (!fnic->fw_ack_recd[0]) 147 return 1; 148 149 /* 150 * Update desc_available count based on number of freed descriptors 151 * Account for wraparound 152 */ 153 if (wq->to_clean_index <= fnic->fw_ack_index[0]) 154 wq->ring.desc_avail += (fnic->fw_ack_index[0] 155 - wq->to_clean_index + 1); 156 else 157 wq->ring.desc_avail += (wq->ring.desc_count 158 - wq->to_clean_index 159 + fnic->fw_ack_index[0] + 1); 160 161 /* 162 * just bump clean index to ack_index+1 accounting for wraparound 163 * this will essentially free up all descriptors between 164 * to_clean_index and fw_ack_index, both inclusive 165 */ 166 wq->to_clean_index = 167 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count; 168 169 /* we have processed the acks received so far */ 170 fnic->fw_ack_recd[0] = 0; 171 return 0; 172 } 173 174 175 /** 176 * __fnic_set_state_flags 177 * Sets/Clears bits in fnic's state_flags 178 **/ 179 void 180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags, 181 unsigned long clearbits) 182 { 183 struct Scsi_Host *host = fnic->lport->host; 184 int sh_locked = spin_is_locked(host->host_lock); 185 unsigned long flags = 0; 186 187 if (!sh_locked) 188 spin_lock_irqsave(host->host_lock, flags); 189 190 if (clearbits) 191 fnic->state_flags &= ~st_flags; 192 else 193 fnic->state_flags |= st_flags; 194 195 if (!sh_locked) 196 spin_unlock_irqrestore(host->host_lock, flags); 197 198 return; 199 } 200 201 202 /* 203 * fnic_fw_reset_handler 204 * Routine to send reset msg to fw 205 */ 206 int fnic_fw_reset_handler(struct fnic *fnic) 207 { 208 struct vnic_wq_copy *wq = &fnic->wq_copy[0]; 209 int ret = 0; 210 unsigned long flags; 211 212 /* indicate fwreset to io path */ 213 fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET); 214 215 skb_queue_purge(&fnic->frame_queue); 216 skb_queue_purge(&fnic->tx_queue); 217 218 /* wait for io cmpl */ 219 while (atomic_read(&fnic->in_flight)) 220 schedule_timeout(msecs_to_jiffies(1)); 221 222 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags); 223 224 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0]) 225 free_wq_copy_descs(fnic, wq); 226 227 if (!vnic_wq_copy_desc_avail(wq)) 228 ret = -EAGAIN; 229 else { 230 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG); 231 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs); 232 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) > 233 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs)) 234 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs, 235 atomic64_read( 236 &fnic->fnic_stats.fw_stats.active_fw_reqs)); 237 } 238 239 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags); 240 241 if (!ret) { 242 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets); 243 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 244 "Issued fw reset\n"); 245 } else { 246 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET); 247 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 248 "Failed to issue fw reset\n"); 249 } 250 251 return ret; 252 } 253 254 255 /* 256 * fnic_flogi_reg_handler 257 * Routine to send flogi register msg to fw 258 */ 259 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id) 260 { 261 struct vnic_wq_copy *wq = &fnic->wq_copy[0]; 262 enum fcpio_flogi_reg_format_type format; 263 struct fc_lport *lp = fnic->lport; 264 u8 gw_mac[ETH_ALEN]; 265 int ret = 0; 266 unsigned long flags; 267 268 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags); 269 270 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0]) 271 free_wq_copy_descs(fnic, wq); 272 273 if (!vnic_wq_copy_desc_avail(wq)) { 274 ret = -EAGAIN; 275 goto flogi_reg_ioreq_end; 276 } 277 278 if (fnic->ctlr.map_dest) { 279 memset(gw_mac, 0xff, ETH_ALEN); 280 format = FCPIO_FLOGI_REG_DEF_DEST; 281 } else { 282 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN); 283 format = FCPIO_FLOGI_REG_GW_DEST; 284 } 285 286 if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) { 287 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG, 288 fc_id, gw_mac, 289 fnic->data_src_addr, 290 lp->r_a_tov, lp->e_d_tov); 291 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 292 "FLOGI FIP reg issued fcid %x src %pM dest %pM\n", 293 fc_id, fnic->data_src_addr, gw_mac); 294 } else { 295 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG, 296 format, fc_id, gw_mac); 297 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 298 "FLOGI reg issued fcid %x map %d dest %pM\n", 299 fc_id, fnic->ctlr.map_dest, gw_mac); 300 } 301 302 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs); 303 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) > 304 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs)) 305 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs, 306 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs)); 307 308 flogi_reg_ioreq_end: 309 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags); 310 return ret; 311 } 312 313 /* 314 * fnic_queue_wq_copy_desc 315 * Routine to enqueue a wq copy desc 316 */ 317 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic, 318 struct vnic_wq_copy *wq, 319 struct fnic_io_req *io_req, 320 struct scsi_cmnd *sc, 321 int sg_count) 322 { 323 struct scatterlist *sg; 324 struct fc_rport *rport = starget_to_rport(scsi_target(sc->device)); 325 struct fc_rport_libfc_priv *rp = rport->dd_data; 326 struct host_sg_desc *desc; 327 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats; 328 unsigned int i; 329 unsigned long intr_flags; 330 int flags; 331 u8 exch_flags; 332 struct scsi_lun fc_lun; 333 int r; 334 335 if (sg_count) { 336 /* For each SGE, create a device desc entry */ 337 desc = io_req->sgl_list; 338 for_each_sg(scsi_sglist(sc), sg, sg_count, i) { 339 desc->addr = cpu_to_le64(sg_dma_address(sg)); 340 desc->len = cpu_to_le32(sg_dma_len(sg)); 341 desc->_resvd = 0; 342 desc++; 343 } 344 345 io_req->sgl_list_pa = pci_map_single 346 (fnic->pdev, 347 io_req->sgl_list, 348 sizeof(io_req->sgl_list[0]) * sg_count, 349 PCI_DMA_TODEVICE); 350 351 r = pci_dma_mapping_error(fnic->pdev, io_req->sgl_list_pa); 352 if (r) { 353 printk(KERN_ERR "PCI mapping failed with error %d\n", r); 354 return SCSI_MLQUEUE_HOST_BUSY; 355 } 356 } 357 358 io_req->sense_buf_pa = pci_map_single(fnic->pdev, 359 sc->sense_buffer, 360 SCSI_SENSE_BUFFERSIZE, 361 PCI_DMA_FROMDEVICE); 362 363 r = pci_dma_mapping_error(fnic->pdev, io_req->sense_buf_pa); 364 if (r) { 365 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa, 366 sizeof(io_req->sgl_list[0]) * sg_count, 367 PCI_DMA_TODEVICE); 368 printk(KERN_ERR "PCI mapping failed with error %d\n", r); 369 return SCSI_MLQUEUE_HOST_BUSY; 370 } 371 372 int_to_scsilun(sc->device->lun, &fc_lun); 373 374 /* Enqueue the descriptor in the Copy WQ */ 375 spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags); 376 377 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0]) 378 free_wq_copy_descs(fnic, wq); 379 380 if (unlikely(!vnic_wq_copy_desc_avail(wq))) { 381 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags); 382 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 383 "fnic_queue_wq_copy_desc failure - no descriptors\n"); 384 atomic64_inc(&misc_stats->io_cpwq_alloc_failures); 385 return SCSI_MLQUEUE_HOST_BUSY; 386 } 387 388 flags = 0; 389 if (sc->sc_data_direction == DMA_FROM_DEVICE) 390 flags = FCPIO_ICMND_RDDATA; 391 else if (sc->sc_data_direction == DMA_TO_DEVICE) 392 flags = FCPIO_ICMND_WRDATA; 393 394 exch_flags = 0; 395 if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) && 396 (rp->flags & FC_RP_FLAGS_RETRY)) 397 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY; 398 399 fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag, 400 0, exch_flags, io_req->sgl_cnt, 401 SCSI_SENSE_BUFFERSIZE, 402 io_req->sgl_list_pa, 403 io_req->sense_buf_pa, 404 0, /* scsi cmd ref, always 0 */ 405 FCPIO_ICMND_PTA_SIMPLE, 406 /* scsi pri and tag */ 407 flags, /* command flags */ 408 sc->cmnd, sc->cmd_len, 409 scsi_bufflen(sc), 410 fc_lun.scsi_lun, io_req->port_id, 411 rport->maxframe_size, rp->r_a_tov, 412 rp->e_d_tov); 413 414 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs); 415 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) > 416 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs)) 417 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs, 418 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs)); 419 420 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags); 421 return 0; 422 } 423 424 /* 425 * fnic_queuecommand 426 * Routine to send a scsi cdb 427 * Called with host_lock held and interrupts disabled. 428 */ 429 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) 430 { 431 struct fc_lport *lp = shost_priv(sc->device->host); 432 struct fc_rport *rport; 433 struct fnic_io_req *io_req = NULL; 434 struct fnic *fnic = lport_priv(lp); 435 struct fnic_stats *fnic_stats = &fnic->fnic_stats; 436 struct vnic_wq_copy *wq; 437 int ret; 438 u64 cmd_trace; 439 int sg_count = 0; 440 unsigned long flags = 0; 441 unsigned long ptr; 442 spinlock_t *io_lock = NULL; 443 int io_lock_acquired = 0; 444 struct fc_rport_libfc_priv *rp; 445 446 if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED))) 447 return SCSI_MLQUEUE_HOST_BUSY; 448 449 rport = starget_to_rport(scsi_target(sc->device)); 450 if (!rport) { 451 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 452 "returning DID_NO_CONNECT for IO as rport is NULL\n"); 453 sc->result = DID_NO_CONNECT << 16; 454 done(sc); 455 return 0; 456 } 457 458 ret = fc_remote_port_chkready(rport); 459 if (ret) { 460 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 461 "rport is not ready\n"); 462 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready); 463 sc->result = ret; 464 done(sc); 465 return 0; 466 } 467 468 rp = rport->dd_data; 469 if (!rp || rp->rp_state != RPORT_ST_READY) { 470 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 471 "returning DID_NO_CONNECT for IO as rport is removed\n"); 472 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready); 473 sc->result = DID_NO_CONNECT<<16; 474 done(sc); 475 return 0; 476 } 477 478 if (lp->state != LPORT_ST_READY || !(lp->link_up)) 479 return SCSI_MLQUEUE_HOST_BUSY; 480 481 atomic_inc(&fnic->in_flight); 482 483 /* 484 * Release host lock, use driver resource specific locks from here. 485 * Don't re-enable interrupts in case they were disabled prior to the 486 * caller disabling them. 487 */ 488 spin_unlock(lp->host->host_lock); 489 CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED; 490 CMD_FLAGS(sc) = FNIC_NO_FLAGS; 491 492 /* Get a new io_req for this SCSI IO */ 493 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC); 494 if (!io_req) { 495 atomic64_inc(&fnic_stats->io_stats.alloc_failures); 496 ret = SCSI_MLQUEUE_HOST_BUSY; 497 goto out; 498 } 499 memset(io_req, 0, sizeof(*io_req)); 500 501 /* Map the data buffer */ 502 sg_count = scsi_dma_map(sc); 503 if (sg_count < 0) { 504 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no, 505 sc->request->tag, sc, 0, sc->cmnd[0], 506 sg_count, CMD_STATE(sc)); 507 mempool_free(io_req, fnic->io_req_pool); 508 goto out; 509 } 510 511 /* Determine the type of scatter/gather list we need */ 512 io_req->sgl_cnt = sg_count; 513 io_req->sgl_type = FNIC_SGL_CACHE_DFLT; 514 if (sg_count > FNIC_DFLT_SG_DESC_CNT) 515 io_req->sgl_type = FNIC_SGL_CACHE_MAX; 516 517 if (sg_count) { 518 io_req->sgl_list = 519 mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type], 520 GFP_ATOMIC); 521 if (!io_req->sgl_list) { 522 atomic64_inc(&fnic_stats->io_stats.alloc_failures); 523 ret = SCSI_MLQUEUE_HOST_BUSY; 524 scsi_dma_unmap(sc); 525 mempool_free(io_req, fnic->io_req_pool); 526 goto out; 527 } 528 529 /* Cache sgl list allocated address before alignment */ 530 io_req->sgl_list_alloc = io_req->sgl_list; 531 ptr = (unsigned long) io_req->sgl_list; 532 if (ptr % FNIC_SG_DESC_ALIGN) { 533 io_req->sgl_list = (struct host_sg_desc *) 534 (((unsigned long) ptr 535 + FNIC_SG_DESC_ALIGN - 1) 536 & ~(FNIC_SG_DESC_ALIGN - 1)); 537 } 538 } 539 540 /* 541 * Will acquire lock defore setting to IO initialized. 542 */ 543 544 io_lock = fnic_io_lock_hash(fnic, sc); 545 spin_lock_irqsave(io_lock, flags); 546 547 /* initialize rest of io_req */ 548 io_lock_acquired = 1; 549 io_req->port_id = rport->port_id; 550 io_req->start_time = jiffies; 551 CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING; 552 CMD_SP(sc) = (char *)io_req; 553 CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED; 554 sc->scsi_done = done; 555 556 /* create copy wq desc and enqueue it */ 557 wq = &fnic->wq_copy[0]; 558 ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count); 559 if (ret) { 560 /* 561 * In case another thread cancelled the request, 562 * refetch the pointer under the lock. 563 */ 564 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no, 565 sc->request->tag, sc, 0, 0, 0, 566 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 567 io_req = (struct fnic_io_req *)CMD_SP(sc); 568 CMD_SP(sc) = NULL; 569 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE; 570 spin_unlock_irqrestore(io_lock, flags); 571 if (io_req) { 572 fnic_release_ioreq_buf(fnic, io_req, sc); 573 mempool_free(io_req, fnic->io_req_pool); 574 } 575 atomic_dec(&fnic->in_flight); 576 /* acquire host lock before returning to SCSI */ 577 spin_lock(lp->host->host_lock); 578 return ret; 579 } else { 580 atomic64_inc(&fnic_stats->io_stats.active_ios); 581 atomic64_inc(&fnic_stats->io_stats.num_ios); 582 if (atomic64_read(&fnic_stats->io_stats.active_ios) > 583 atomic64_read(&fnic_stats->io_stats.max_active_ios)) 584 atomic64_set(&fnic_stats->io_stats.max_active_ios, 585 atomic64_read(&fnic_stats->io_stats.active_ios)); 586 587 /* REVISIT: Use per IO lock in the final code */ 588 CMD_FLAGS(sc) |= FNIC_IO_ISSUED; 589 } 590 out: 591 cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 | 592 (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 | 593 (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 | 594 sc->cmnd[5]); 595 596 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no, 597 sc->request->tag, sc, io_req, 598 sg_count, cmd_trace, 599 (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc))); 600 601 /* if only we issued IO, will we have the io lock */ 602 if (io_lock_acquired) 603 spin_unlock_irqrestore(io_lock, flags); 604 605 atomic_dec(&fnic->in_flight); 606 /* acquire host lock before returning to SCSI */ 607 spin_lock(lp->host->host_lock); 608 return ret; 609 } 610 611 DEF_SCSI_QCMD(fnic_queuecommand) 612 613 /* 614 * fnic_fcpio_fw_reset_cmpl_handler 615 * Routine to handle fw reset completion 616 */ 617 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic, 618 struct fcpio_fw_req *desc) 619 { 620 u8 type; 621 u8 hdr_status; 622 struct fcpio_tag tag; 623 int ret = 0; 624 unsigned long flags; 625 struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats; 626 627 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag); 628 629 atomic64_inc(&reset_stats->fw_reset_completions); 630 631 /* Clean up all outstanding io requests */ 632 fnic_cleanup_io(fnic, SCSI_NO_TAG); 633 634 atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0); 635 atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0); 636 637 spin_lock_irqsave(&fnic->fnic_lock, flags); 638 639 /* fnic should be in FC_TRANS_ETH_MODE */ 640 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) { 641 /* Check status of reset completion */ 642 if (!hdr_status) { 643 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 644 "reset cmpl success\n"); 645 /* Ready to send flogi out */ 646 fnic->state = FNIC_IN_ETH_MODE; 647 } else { 648 FNIC_SCSI_DBG(KERN_DEBUG, 649 fnic->lport->host, 650 "fnic fw_reset : failed %s\n", 651 fnic_fcpio_status_to_str(hdr_status)); 652 653 /* 654 * Unable to change to eth mode, cannot send out flogi 655 * Change state to fc mode, so that subsequent Flogi 656 * requests from libFC will cause more attempts to 657 * reset the firmware. Free the cached flogi 658 */ 659 fnic->state = FNIC_IN_FC_MODE; 660 atomic64_inc(&reset_stats->fw_reset_failures); 661 ret = -1; 662 } 663 } else { 664 FNIC_SCSI_DBG(KERN_DEBUG, 665 fnic->lport->host, 666 "Unexpected state %s while processing" 667 " reset cmpl\n", fnic_state_to_str(fnic->state)); 668 atomic64_inc(&reset_stats->fw_reset_failures); 669 ret = -1; 670 } 671 672 /* Thread removing device blocks till firmware reset is complete */ 673 if (fnic->remove_wait) 674 complete(fnic->remove_wait); 675 676 /* 677 * If fnic is being removed, or fw reset failed 678 * free the flogi frame. Else, send it out 679 */ 680 if (fnic->remove_wait || ret) { 681 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 682 skb_queue_purge(&fnic->tx_queue); 683 goto reset_cmpl_handler_end; 684 } 685 686 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 687 688 fnic_flush_tx(fnic); 689 690 reset_cmpl_handler_end: 691 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET); 692 693 return ret; 694 } 695 696 /* 697 * fnic_fcpio_flogi_reg_cmpl_handler 698 * Routine to handle flogi register completion 699 */ 700 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic, 701 struct fcpio_fw_req *desc) 702 { 703 u8 type; 704 u8 hdr_status; 705 struct fcpio_tag tag; 706 int ret = 0; 707 unsigned long flags; 708 709 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag); 710 711 /* Update fnic state based on status of flogi reg completion */ 712 spin_lock_irqsave(&fnic->fnic_lock, flags); 713 714 if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) { 715 716 /* Check flogi registration completion status */ 717 if (!hdr_status) { 718 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 719 "flog reg succeeded\n"); 720 fnic->state = FNIC_IN_FC_MODE; 721 } else { 722 FNIC_SCSI_DBG(KERN_DEBUG, 723 fnic->lport->host, 724 "fnic flogi reg :failed %s\n", 725 fnic_fcpio_status_to_str(hdr_status)); 726 fnic->state = FNIC_IN_ETH_MODE; 727 ret = -1; 728 } 729 } else { 730 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 731 "Unexpected fnic state %s while" 732 " processing flogi reg completion\n", 733 fnic_state_to_str(fnic->state)); 734 ret = -1; 735 } 736 737 if (!ret) { 738 if (fnic->stop_rx_link_events) { 739 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 740 goto reg_cmpl_handler_end; 741 } 742 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 743 744 fnic_flush_tx(fnic); 745 queue_work(fnic_event_queue, &fnic->frame_work); 746 } else { 747 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 748 } 749 750 reg_cmpl_handler_end: 751 return ret; 752 } 753 754 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq, 755 u16 request_out) 756 { 757 if (wq->to_clean_index <= wq->to_use_index) { 758 /* out of range, stale request_out index */ 759 if (request_out < wq->to_clean_index || 760 request_out >= wq->to_use_index) 761 return 0; 762 } else { 763 /* out of range, stale request_out index */ 764 if (request_out < wq->to_clean_index && 765 request_out >= wq->to_use_index) 766 return 0; 767 } 768 /* request_out index is in range */ 769 return 1; 770 } 771 772 773 /* 774 * Mark that ack received and store the Ack index. If there are multiple 775 * acks received before Tx thread cleans it up, the latest value will be 776 * used which is correct behavior. This state should be in the copy Wq 777 * instead of in the fnic 778 */ 779 static inline void fnic_fcpio_ack_handler(struct fnic *fnic, 780 unsigned int cq_index, 781 struct fcpio_fw_req *desc) 782 { 783 struct vnic_wq_copy *wq; 784 u16 request_out = desc->u.ack.request_out; 785 unsigned long flags; 786 u64 *ox_id_tag = (u64 *)(void *)desc; 787 788 /* mark the ack state */ 789 wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count]; 790 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags); 791 792 fnic->fnic_stats.misc_stats.last_ack_time = jiffies; 793 if (is_ack_index_in_range(wq, request_out)) { 794 fnic->fw_ack_index[0] = request_out; 795 fnic->fw_ack_recd[0] = 1; 796 } else 797 atomic64_inc( 798 &fnic->fnic_stats.misc_stats.ack_index_out_of_range); 799 800 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags); 801 FNIC_TRACE(fnic_fcpio_ack_handler, 802 fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3], 803 ox_id_tag[4], ox_id_tag[5]); 804 } 805 806 /* 807 * fnic_fcpio_icmnd_cmpl_handler 808 * Routine to handle icmnd completions 809 */ 810 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic, 811 struct fcpio_fw_req *desc) 812 { 813 u8 type; 814 u8 hdr_status; 815 struct fcpio_tag tag; 816 u32 id; 817 u64 xfer_len = 0; 818 struct fcpio_icmnd_cmpl *icmnd_cmpl; 819 struct fnic_io_req *io_req; 820 struct scsi_cmnd *sc; 821 struct fnic_stats *fnic_stats = &fnic->fnic_stats; 822 unsigned long flags; 823 spinlock_t *io_lock; 824 u64 cmd_trace; 825 unsigned long start_time; 826 827 /* Decode the cmpl description to get the io_req id */ 828 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag); 829 fcpio_tag_id_dec(&tag, &id); 830 icmnd_cmpl = &desc->u.icmnd_cmpl; 831 832 if (id >= fnic->fnic_max_tag_id) { 833 shost_printk(KERN_ERR, fnic->lport->host, 834 "Tag out of range tag %x hdr status = %s\n", 835 id, fnic_fcpio_status_to_str(hdr_status)); 836 return; 837 } 838 839 sc = scsi_host_find_tag(fnic->lport->host, id); 840 WARN_ON_ONCE(!sc); 841 if (!sc) { 842 atomic64_inc(&fnic_stats->io_stats.sc_null); 843 shost_printk(KERN_ERR, fnic->lport->host, 844 "icmnd_cmpl sc is null - " 845 "hdr status = %s tag = 0x%x desc = 0x%p\n", 846 fnic_fcpio_status_to_str(hdr_status), id, desc); 847 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler, 848 fnic->lport->host->host_no, id, 849 ((u64)icmnd_cmpl->_resvd0[1] << 16 | 850 (u64)icmnd_cmpl->_resvd0[0]), 851 ((u64)hdr_status << 16 | 852 (u64)icmnd_cmpl->scsi_status << 8 | 853 (u64)icmnd_cmpl->flags), desc, 854 (u64)icmnd_cmpl->residual, 0); 855 return; 856 } 857 858 io_lock = fnic_io_lock_hash(fnic, sc); 859 spin_lock_irqsave(io_lock, flags); 860 io_req = (struct fnic_io_req *)CMD_SP(sc); 861 WARN_ON_ONCE(!io_req); 862 if (!io_req) { 863 atomic64_inc(&fnic_stats->io_stats.ioreq_null); 864 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL; 865 spin_unlock_irqrestore(io_lock, flags); 866 shost_printk(KERN_ERR, fnic->lport->host, 867 "icmnd_cmpl io_req is null - " 868 "hdr status = %s tag = 0x%x sc 0x%p\n", 869 fnic_fcpio_status_to_str(hdr_status), id, sc); 870 return; 871 } 872 start_time = io_req->start_time; 873 874 /* firmware completed the io */ 875 io_req->io_completed = 1; 876 877 /* 878 * if SCSI-ML has already issued abort on this command, 879 * ignore completion of the IO. The abts path will clean it up 880 */ 881 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 882 spin_unlock_irqrestore(io_lock, flags); 883 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING; 884 switch (hdr_status) { 885 case FCPIO_SUCCESS: 886 CMD_FLAGS(sc) |= FNIC_IO_DONE; 887 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 888 "icmnd_cmpl ABTS pending hdr status = %s " 889 "sc 0x%p scsi_status %x residual %d\n", 890 fnic_fcpio_status_to_str(hdr_status), sc, 891 icmnd_cmpl->scsi_status, 892 icmnd_cmpl->residual); 893 break; 894 case FCPIO_ABORTED: 895 CMD_FLAGS(sc) |= FNIC_IO_ABORTED; 896 break; 897 default: 898 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 899 "icmnd_cmpl abts pending " 900 "hdr status = %s tag = 0x%x sc = 0x%p\n", 901 fnic_fcpio_status_to_str(hdr_status), 902 id, sc); 903 break; 904 } 905 return; 906 } 907 908 /* Mark the IO as complete */ 909 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE; 910 911 icmnd_cmpl = &desc->u.icmnd_cmpl; 912 913 switch (hdr_status) { 914 case FCPIO_SUCCESS: 915 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status; 916 xfer_len = scsi_bufflen(sc); 917 scsi_set_resid(sc, icmnd_cmpl->residual); 918 919 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER) 920 xfer_len -= icmnd_cmpl->residual; 921 922 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL) 923 atomic64_inc(&fnic_stats->misc_stats.queue_fulls); 924 break; 925 926 case FCPIO_TIMEOUT: /* request was timed out */ 927 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout); 928 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status; 929 break; 930 931 case FCPIO_ABORTED: /* request was aborted */ 932 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted); 933 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 934 break; 935 936 case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */ 937 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch); 938 scsi_set_resid(sc, icmnd_cmpl->residual); 939 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 940 break; 941 942 case FCPIO_OUT_OF_RESOURCE: /* out of resources to complete request */ 943 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources); 944 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status; 945 break; 946 947 case FCPIO_IO_NOT_FOUND: /* requested I/O was not found */ 948 atomic64_inc(&fnic_stats->io_stats.io_not_found); 949 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 950 break; 951 952 case FCPIO_SGL_INVALID: /* request was aborted due to sgl error */ 953 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid); 954 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 955 break; 956 957 case FCPIO_FW_ERR: /* request was terminated due fw error */ 958 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs); 959 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 960 break; 961 962 case FCPIO_MSS_INVALID: /* request was aborted due to mss error */ 963 atomic64_inc(&fnic_stats->misc_stats.mss_invalid); 964 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 965 break; 966 967 case FCPIO_INVALID_HEADER: /* header contains invalid data */ 968 case FCPIO_INVALID_PARAM: /* some parameter in request invalid */ 969 case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */ 970 default: 971 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status; 972 break; 973 } 974 975 /* Break link with the SCSI command */ 976 CMD_SP(sc) = NULL; 977 CMD_FLAGS(sc) |= FNIC_IO_DONE; 978 979 spin_unlock_irqrestore(io_lock, flags); 980 981 if (hdr_status != FCPIO_SUCCESS) { 982 atomic64_inc(&fnic_stats->io_stats.io_failures); 983 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n", 984 fnic_fcpio_status_to_str(hdr_status)); 985 } 986 987 fnic_release_ioreq_buf(fnic, io_req, sc); 988 989 mempool_free(io_req, fnic->io_req_pool); 990 991 cmd_trace = ((u64)hdr_status << 56) | 992 (u64)icmnd_cmpl->scsi_status << 48 | 993 (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 | 994 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 | 995 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]; 996 997 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler, 998 sc->device->host->host_no, id, sc, 999 ((u64)icmnd_cmpl->_resvd0[1] << 56 | 1000 (u64)icmnd_cmpl->_resvd0[0] << 48 | 1001 jiffies_to_msecs(jiffies - start_time)), 1002 desc, cmd_trace, 1003 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1004 1005 if (sc->sc_data_direction == DMA_FROM_DEVICE) { 1006 fnic->lport->host_stats.fcp_input_requests++; 1007 fnic->fcp_input_bytes += xfer_len; 1008 } else if (sc->sc_data_direction == DMA_TO_DEVICE) { 1009 fnic->lport->host_stats.fcp_output_requests++; 1010 fnic->fcp_output_bytes += xfer_len; 1011 } else 1012 fnic->lport->host_stats.fcp_control_requests++; 1013 1014 atomic64_dec(&fnic_stats->io_stats.active_ios); 1015 if (atomic64_read(&fnic->io_cmpl_skip)) 1016 atomic64_dec(&fnic->io_cmpl_skip); 1017 else 1018 atomic64_inc(&fnic_stats->io_stats.io_completions); 1019 1020 /* Call SCSI completion function to complete the IO */ 1021 if (sc->scsi_done) 1022 sc->scsi_done(sc); 1023 } 1024 1025 /* fnic_fcpio_itmf_cmpl_handler 1026 * Routine to handle itmf completions 1027 */ 1028 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic, 1029 struct fcpio_fw_req *desc) 1030 { 1031 u8 type; 1032 u8 hdr_status; 1033 struct fcpio_tag tag; 1034 u32 id; 1035 struct scsi_cmnd *sc; 1036 struct fnic_io_req *io_req; 1037 struct fnic_stats *fnic_stats = &fnic->fnic_stats; 1038 struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats; 1039 struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats; 1040 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats; 1041 unsigned long flags; 1042 spinlock_t *io_lock; 1043 unsigned long start_time; 1044 1045 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag); 1046 fcpio_tag_id_dec(&tag, &id); 1047 1048 if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) { 1049 shost_printk(KERN_ERR, fnic->lport->host, 1050 "Tag out of range tag %x hdr status = %s\n", 1051 id, fnic_fcpio_status_to_str(hdr_status)); 1052 return; 1053 } 1054 1055 sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK); 1056 WARN_ON_ONCE(!sc); 1057 if (!sc) { 1058 atomic64_inc(&fnic_stats->io_stats.sc_null); 1059 shost_printk(KERN_ERR, fnic->lport->host, 1060 "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n", 1061 fnic_fcpio_status_to_str(hdr_status), id); 1062 return; 1063 } 1064 io_lock = fnic_io_lock_hash(fnic, sc); 1065 spin_lock_irqsave(io_lock, flags); 1066 io_req = (struct fnic_io_req *)CMD_SP(sc); 1067 WARN_ON_ONCE(!io_req); 1068 if (!io_req) { 1069 atomic64_inc(&fnic_stats->io_stats.ioreq_null); 1070 spin_unlock_irqrestore(io_lock, flags); 1071 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL; 1072 shost_printk(KERN_ERR, fnic->lport->host, 1073 "itmf_cmpl io_req is null - " 1074 "hdr status = %s tag = 0x%x sc 0x%p\n", 1075 fnic_fcpio_status_to_str(hdr_status), id, sc); 1076 return; 1077 } 1078 start_time = io_req->start_time; 1079 1080 if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) { 1081 /* Abort and terminate completion of device reset req */ 1082 /* REVISIT : Add asserts about various flags */ 1083 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1084 "dev reset abts cmpl recd. id %x status %s\n", 1085 id, fnic_fcpio_status_to_str(hdr_status)); 1086 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE; 1087 CMD_ABTS_STATUS(sc) = hdr_status; 1088 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE; 1089 if (io_req->abts_done) 1090 complete(io_req->abts_done); 1091 spin_unlock_irqrestore(io_lock, flags); 1092 } else if (id & FNIC_TAG_ABORT) { 1093 /* Completion of abort cmd */ 1094 switch (hdr_status) { 1095 case FCPIO_SUCCESS: 1096 break; 1097 case FCPIO_TIMEOUT: 1098 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED) 1099 atomic64_inc(&abts_stats->abort_fw_timeouts); 1100 else 1101 atomic64_inc( 1102 &term_stats->terminate_fw_timeouts); 1103 break; 1104 case FCPIO_ITMF_REJECTED: 1105 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 1106 "abort reject recd. id %d\n", 1107 (int)(id & FNIC_TAG_MASK)); 1108 break; 1109 case FCPIO_IO_NOT_FOUND: 1110 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED) 1111 atomic64_inc(&abts_stats->abort_io_not_found); 1112 else 1113 atomic64_inc( 1114 &term_stats->terminate_io_not_found); 1115 break; 1116 default: 1117 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED) 1118 atomic64_inc(&abts_stats->abort_failures); 1119 else 1120 atomic64_inc( 1121 &term_stats->terminate_failures); 1122 break; 1123 } 1124 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) { 1125 /* This is a late completion. Ignore it */ 1126 spin_unlock_irqrestore(io_lock, flags); 1127 return; 1128 } 1129 1130 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE; 1131 1132 /* If the status is IO not found consider it as success */ 1133 if (hdr_status == FCPIO_IO_NOT_FOUND) 1134 CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS; 1135 else 1136 CMD_ABTS_STATUS(sc) = hdr_status; 1137 1138 atomic64_dec(&fnic_stats->io_stats.active_ios); 1139 if (atomic64_read(&fnic->io_cmpl_skip)) 1140 atomic64_dec(&fnic->io_cmpl_skip); 1141 else 1142 atomic64_inc(&fnic_stats->io_stats.io_completions); 1143 1144 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) 1145 atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls); 1146 1147 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1148 "abts cmpl recd. id %d status %s\n", 1149 (int)(id & FNIC_TAG_MASK), 1150 fnic_fcpio_status_to_str(hdr_status)); 1151 1152 /* 1153 * If scsi_eh thread is blocked waiting for abts to complete, 1154 * signal completion to it. IO will be cleaned in the thread 1155 * else clean it in this context 1156 */ 1157 if (io_req->abts_done) { 1158 complete(io_req->abts_done); 1159 spin_unlock_irqrestore(io_lock, flags); 1160 } else { 1161 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1162 "abts cmpl, completing IO\n"); 1163 CMD_SP(sc) = NULL; 1164 sc->result = (DID_ERROR << 16); 1165 1166 spin_unlock_irqrestore(io_lock, flags); 1167 1168 fnic_release_ioreq_buf(fnic, io_req, sc); 1169 mempool_free(io_req, fnic->io_req_pool); 1170 if (sc->scsi_done) { 1171 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler, 1172 sc->device->host->host_no, id, 1173 sc, 1174 jiffies_to_msecs(jiffies - start_time), 1175 desc, 1176 (((u64)hdr_status << 40) | 1177 (u64)sc->cmnd[0] << 32 | 1178 (u64)sc->cmnd[2] << 24 | 1179 (u64)sc->cmnd[3] << 16 | 1180 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]), 1181 (((u64)CMD_FLAGS(sc) << 32) | 1182 CMD_STATE(sc))); 1183 sc->scsi_done(sc); 1184 } 1185 } 1186 1187 } else if (id & FNIC_TAG_DEV_RST) { 1188 /* Completion of device reset */ 1189 CMD_LR_STATUS(sc) = hdr_status; 1190 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 1191 spin_unlock_irqrestore(io_lock, flags); 1192 CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING; 1193 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler, 1194 sc->device->host->host_no, id, sc, 1195 jiffies_to_msecs(jiffies - start_time), 1196 desc, 0, 1197 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1198 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1199 "Terminate pending " 1200 "dev reset cmpl recd. id %d status %s\n", 1201 (int)(id & FNIC_TAG_MASK), 1202 fnic_fcpio_status_to_str(hdr_status)); 1203 return; 1204 } 1205 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) { 1206 /* Need to wait for terminate completion */ 1207 spin_unlock_irqrestore(io_lock, flags); 1208 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler, 1209 sc->device->host->host_no, id, sc, 1210 jiffies_to_msecs(jiffies - start_time), 1211 desc, 0, 1212 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1213 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1214 "dev reset cmpl recd after time out. " 1215 "id %d status %s\n", 1216 (int)(id & FNIC_TAG_MASK), 1217 fnic_fcpio_status_to_str(hdr_status)); 1218 return; 1219 } 1220 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE; 1221 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE; 1222 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1223 "dev reset cmpl recd. id %d status %s\n", 1224 (int)(id & FNIC_TAG_MASK), 1225 fnic_fcpio_status_to_str(hdr_status)); 1226 if (io_req->dr_done) 1227 complete(io_req->dr_done); 1228 spin_unlock_irqrestore(io_lock, flags); 1229 1230 } else { 1231 shost_printk(KERN_ERR, fnic->lport->host, 1232 "Unexpected itmf io state %s tag %x\n", 1233 fnic_ioreq_state_to_str(CMD_STATE(sc)), id); 1234 spin_unlock_irqrestore(io_lock, flags); 1235 } 1236 1237 } 1238 1239 /* 1240 * fnic_fcpio_cmpl_handler 1241 * Routine to service the cq for wq_copy 1242 */ 1243 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev, 1244 unsigned int cq_index, 1245 struct fcpio_fw_req *desc) 1246 { 1247 struct fnic *fnic = vnic_dev_priv(vdev); 1248 1249 switch (desc->hdr.type) { 1250 case FCPIO_ICMND_CMPL: /* fw completed a command */ 1251 case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/ 1252 case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */ 1253 case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */ 1254 case FCPIO_RESET_CMPL: /* fw completed reset */ 1255 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs); 1256 break; 1257 default: 1258 break; 1259 } 1260 1261 switch (desc->hdr.type) { 1262 case FCPIO_ACK: /* fw copied copy wq desc to its queue */ 1263 fnic_fcpio_ack_handler(fnic, cq_index, desc); 1264 break; 1265 1266 case FCPIO_ICMND_CMPL: /* fw completed a command */ 1267 fnic_fcpio_icmnd_cmpl_handler(fnic, desc); 1268 break; 1269 1270 case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/ 1271 fnic_fcpio_itmf_cmpl_handler(fnic, desc); 1272 break; 1273 1274 case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */ 1275 case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */ 1276 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc); 1277 break; 1278 1279 case FCPIO_RESET_CMPL: /* fw completed reset */ 1280 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc); 1281 break; 1282 1283 default: 1284 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1285 "firmware completion type %d\n", 1286 desc->hdr.type); 1287 break; 1288 } 1289 1290 return 0; 1291 } 1292 1293 /* 1294 * fnic_wq_copy_cmpl_handler 1295 * Routine to process wq copy 1296 */ 1297 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do) 1298 { 1299 unsigned int wq_work_done = 0; 1300 unsigned int i, cq_index; 1301 unsigned int cur_work_done; 1302 1303 for (i = 0; i < fnic->wq_copy_count; i++) { 1304 cq_index = i + fnic->raw_wq_count + fnic->rq_count; 1305 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index], 1306 fnic_fcpio_cmpl_handler, 1307 copy_work_to_do); 1308 wq_work_done += cur_work_done; 1309 } 1310 return wq_work_done; 1311 } 1312 1313 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id) 1314 { 1315 int i; 1316 struct fnic_io_req *io_req; 1317 unsigned long flags = 0; 1318 struct scsi_cmnd *sc; 1319 spinlock_t *io_lock; 1320 unsigned long start_time = 0; 1321 struct fnic_stats *fnic_stats = &fnic->fnic_stats; 1322 1323 for (i = 0; i < fnic->fnic_max_tag_id; i++) { 1324 if (i == exclude_id) 1325 continue; 1326 1327 io_lock = fnic_io_lock_tag(fnic, i); 1328 spin_lock_irqsave(io_lock, flags); 1329 sc = scsi_host_find_tag(fnic->lport->host, i); 1330 if (!sc) { 1331 spin_unlock_irqrestore(io_lock, flags); 1332 continue; 1333 } 1334 1335 io_req = (struct fnic_io_req *)CMD_SP(sc); 1336 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) && 1337 !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) { 1338 /* 1339 * We will be here only when FW completes reset 1340 * without sending completions for outstanding ios. 1341 */ 1342 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE; 1343 if (io_req && io_req->dr_done) 1344 complete(io_req->dr_done); 1345 else if (io_req && io_req->abts_done) 1346 complete(io_req->abts_done); 1347 spin_unlock_irqrestore(io_lock, flags); 1348 continue; 1349 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) { 1350 spin_unlock_irqrestore(io_lock, flags); 1351 continue; 1352 } 1353 if (!io_req) { 1354 spin_unlock_irqrestore(io_lock, flags); 1355 goto cleanup_scsi_cmd; 1356 } 1357 1358 CMD_SP(sc) = NULL; 1359 1360 spin_unlock_irqrestore(io_lock, flags); 1361 1362 /* 1363 * If there is a scsi_cmnd associated with this io_req, then 1364 * free the corresponding state 1365 */ 1366 start_time = io_req->start_time; 1367 fnic_release_ioreq_buf(fnic, io_req, sc); 1368 mempool_free(io_req, fnic->io_req_pool); 1369 1370 cleanup_scsi_cmd: 1371 sc->result = DID_TRANSPORT_DISRUPTED << 16; 1372 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1373 "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n", 1374 __func__, (jiffies - start_time)); 1375 1376 if (atomic64_read(&fnic->io_cmpl_skip)) 1377 atomic64_dec(&fnic->io_cmpl_skip); 1378 else 1379 atomic64_inc(&fnic_stats->io_stats.io_completions); 1380 1381 /* Complete the command to SCSI */ 1382 if (sc->scsi_done) { 1383 FNIC_TRACE(fnic_cleanup_io, 1384 sc->device->host->host_no, i, sc, 1385 jiffies_to_msecs(jiffies - start_time), 1386 0, ((u64)sc->cmnd[0] << 32 | 1387 (u64)sc->cmnd[2] << 24 | 1388 (u64)sc->cmnd[3] << 16 | 1389 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]), 1390 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1391 1392 sc->scsi_done(sc); 1393 } 1394 } 1395 } 1396 1397 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq, 1398 struct fcpio_host_req *desc) 1399 { 1400 u32 id; 1401 struct fnic *fnic = vnic_dev_priv(wq->vdev); 1402 struct fnic_io_req *io_req; 1403 struct scsi_cmnd *sc; 1404 unsigned long flags; 1405 spinlock_t *io_lock; 1406 unsigned long start_time = 0; 1407 1408 /* get the tag reference */ 1409 fcpio_tag_id_dec(&desc->hdr.tag, &id); 1410 id &= FNIC_TAG_MASK; 1411 1412 if (id >= fnic->fnic_max_tag_id) 1413 return; 1414 1415 sc = scsi_host_find_tag(fnic->lport->host, id); 1416 if (!sc) 1417 return; 1418 1419 io_lock = fnic_io_lock_hash(fnic, sc); 1420 spin_lock_irqsave(io_lock, flags); 1421 1422 /* Get the IO context which this desc refers to */ 1423 io_req = (struct fnic_io_req *)CMD_SP(sc); 1424 1425 /* fnic interrupts are turned off by now */ 1426 1427 if (!io_req) { 1428 spin_unlock_irqrestore(io_lock, flags); 1429 goto wq_copy_cleanup_scsi_cmd; 1430 } 1431 1432 CMD_SP(sc) = NULL; 1433 1434 spin_unlock_irqrestore(io_lock, flags); 1435 1436 start_time = io_req->start_time; 1437 fnic_release_ioreq_buf(fnic, io_req, sc); 1438 mempool_free(io_req, fnic->io_req_pool); 1439 1440 wq_copy_cleanup_scsi_cmd: 1441 sc->result = DID_NO_CONNECT << 16; 1442 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:" 1443 " DID_NO_CONNECT\n"); 1444 1445 if (sc->scsi_done) { 1446 FNIC_TRACE(fnic_wq_copy_cleanup_handler, 1447 sc->device->host->host_no, id, sc, 1448 jiffies_to_msecs(jiffies - start_time), 1449 0, ((u64)sc->cmnd[0] << 32 | 1450 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 | 1451 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]), 1452 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1453 1454 sc->scsi_done(sc); 1455 } 1456 } 1457 1458 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag, 1459 u32 task_req, u8 *fc_lun, 1460 struct fnic_io_req *io_req) 1461 { 1462 struct vnic_wq_copy *wq = &fnic->wq_copy[0]; 1463 struct Scsi_Host *host = fnic->lport->host; 1464 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats; 1465 unsigned long flags; 1466 1467 spin_lock_irqsave(host->host_lock, flags); 1468 if (unlikely(fnic_chk_state_flags_locked(fnic, 1469 FNIC_FLAGS_IO_BLOCKED))) { 1470 spin_unlock_irqrestore(host->host_lock, flags); 1471 return 1; 1472 } else 1473 atomic_inc(&fnic->in_flight); 1474 spin_unlock_irqrestore(host->host_lock, flags); 1475 1476 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags); 1477 1478 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0]) 1479 free_wq_copy_descs(fnic, wq); 1480 1481 if (!vnic_wq_copy_desc_avail(wq)) { 1482 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags); 1483 atomic_dec(&fnic->in_flight); 1484 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1485 "fnic_queue_abort_io_req: failure: no descriptors\n"); 1486 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures); 1487 return 1; 1488 } 1489 fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT, 1490 0, task_req, tag, fc_lun, io_req->port_id, 1491 fnic->config.ra_tov, fnic->config.ed_tov); 1492 1493 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs); 1494 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) > 1495 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs)) 1496 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs, 1497 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs)); 1498 1499 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags); 1500 atomic_dec(&fnic->in_flight); 1501 1502 return 0; 1503 } 1504 1505 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id) 1506 { 1507 int tag; 1508 int abt_tag; 1509 int term_cnt = 0; 1510 struct fnic_io_req *io_req; 1511 spinlock_t *io_lock; 1512 unsigned long flags; 1513 struct scsi_cmnd *sc; 1514 struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats; 1515 struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats; 1516 struct scsi_lun fc_lun; 1517 enum fnic_ioreq_state old_ioreq_state; 1518 1519 FNIC_SCSI_DBG(KERN_DEBUG, 1520 fnic->lport->host, 1521 "fnic_rport_exch_reset called portid 0x%06x\n", 1522 port_id); 1523 1524 if (fnic->in_remove) 1525 return; 1526 1527 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) { 1528 abt_tag = tag; 1529 io_lock = fnic_io_lock_tag(fnic, tag); 1530 spin_lock_irqsave(io_lock, flags); 1531 sc = scsi_host_find_tag(fnic->lport->host, tag); 1532 if (!sc) { 1533 spin_unlock_irqrestore(io_lock, flags); 1534 continue; 1535 } 1536 1537 io_req = (struct fnic_io_req *)CMD_SP(sc); 1538 1539 if (!io_req || io_req->port_id != port_id) { 1540 spin_unlock_irqrestore(io_lock, flags); 1541 continue; 1542 } 1543 1544 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) && 1545 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) { 1546 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1547 "fnic_rport_exch_reset dev rst not pending sc 0x%p\n", 1548 sc); 1549 spin_unlock_irqrestore(io_lock, flags); 1550 continue; 1551 } 1552 1553 /* 1554 * Found IO that is still pending with firmware and 1555 * belongs to rport that went away 1556 */ 1557 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 1558 spin_unlock_irqrestore(io_lock, flags); 1559 continue; 1560 } 1561 if (io_req->abts_done) { 1562 shost_printk(KERN_ERR, fnic->lport->host, 1563 "fnic_rport_exch_reset: io_req->abts_done is set " 1564 "state is %s\n", 1565 fnic_ioreq_state_to_str(CMD_STATE(sc))); 1566 } 1567 1568 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) { 1569 shost_printk(KERN_ERR, fnic->lport->host, 1570 "rport_exch_reset " 1571 "IO not yet issued %p tag 0x%x flags " 1572 "%x state %d\n", 1573 sc, tag, CMD_FLAGS(sc), CMD_STATE(sc)); 1574 } 1575 old_ioreq_state = CMD_STATE(sc); 1576 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING; 1577 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE; 1578 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) { 1579 atomic64_inc(&reset_stats->device_reset_terminates); 1580 abt_tag = (tag | FNIC_TAG_DEV_RST); 1581 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1582 "fnic_rport_exch_reset dev rst sc 0x%p\n", 1583 sc); 1584 } 1585 1586 BUG_ON(io_req->abts_done); 1587 1588 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1589 "fnic_rport_reset_exch: Issuing abts\n"); 1590 1591 spin_unlock_irqrestore(io_lock, flags); 1592 1593 /* Now queue the abort command to firmware */ 1594 int_to_scsilun(sc->device->lun, &fc_lun); 1595 1596 if (fnic_queue_abort_io_req(fnic, abt_tag, 1597 FCPIO_ITMF_ABT_TASK_TERM, 1598 fc_lun.scsi_lun, io_req)) { 1599 /* 1600 * Revert the cmd state back to old state, if 1601 * it hasn't changed in between. This cmd will get 1602 * aborted later by scsi_eh, or cleaned up during 1603 * lun reset 1604 */ 1605 spin_lock_irqsave(io_lock, flags); 1606 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) 1607 CMD_STATE(sc) = old_ioreq_state; 1608 spin_unlock_irqrestore(io_lock, flags); 1609 } else { 1610 spin_lock_irqsave(io_lock, flags); 1611 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) 1612 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED; 1613 else 1614 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED; 1615 spin_unlock_irqrestore(io_lock, flags); 1616 atomic64_inc(&term_stats->terminates); 1617 term_cnt++; 1618 } 1619 } 1620 if (term_cnt > atomic64_read(&term_stats->max_terminates)) 1621 atomic64_set(&term_stats->max_terminates, term_cnt); 1622 1623 } 1624 1625 void fnic_terminate_rport_io(struct fc_rport *rport) 1626 { 1627 int tag; 1628 int abt_tag; 1629 int term_cnt = 0; 1630 struct fnic_io_req *io_req; 1631 spinlock_t *io_lock; 1632 unsigned long flags; 1633 struct scsi_cmnd *sc; 1634 struct scsi_lun fc_lun; 1635 struct fc_rport_libfc_priv *rdata; 1636 struct fc_lport *lport; 1637 struct fnic *fnic; 1638 struct fc_rport *cmd_rport; 1639 struct reset_stats *reset_stats; 1640 struct terminate_stats *term_stats; 1641 enum fnic_ioreq_state old_ioreq_state; 1642 1643 if (!rport) { 1644 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n"); 1645 return; 1646 } 1647 rdata = rport->dd_data; 1648 1649 if (!rdata) { 1650 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n"); 1651 return; 1652 } 1653 lport = rdata->local_port; 1654 1655 if (!lport) { 1656 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n"); 1657 return; 1658 } 1659 fnic = lport_priv(lport); 1660 FNIC_SCSI_DBG(KERN_DEBUG, 1661 fnic->lport->host, "fnic_terminate_rport_io called" 1662 " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n", 1663 rport->port_name, rport->node_name, rport, 1664 rport->port_id); 1665 1666 if (fnic->in_remove) 1667 return; 1668 1669 reset_stats = &fnic->fnic_stats.reset_stats; 1670 term_stats = &fnic->fnic_stats.term_stats; 1671 1672 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) { 1673 abt_tag = tag; 1674 io_lock = fnic_io_lock_tag(fnic, tag); 1675 spin_lock_irqsave(io_lock, flags); 1676 sc = scsi_host_find_tag(fnic->lport->host, tag); 1677 if (!sc) { 1678 spin_unlock_irqrestore(io_lock, flags); 1679 continue; 1680 } 1681 1682 cmd_rport = starget_to_rport(scsi_target(sc->device)); 1683 if (rport != cmd_rport) { 1684 spin_unlock_irqrestore(io_lock, flags); 1685 continue; 1686 } 1687 1688 io_req = (struct fnic_io_req *)CMD_SP(sc); 1689 1690 if (!io_req || rport != cmd_rport) { 1691 spin_unlock_irqrestore(io_lock, flags); 1692 continue; 1693 } 1694 1695 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) && 1696 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) { 1697 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1698 "fnic_terminate_rport_io dev rst not pending sc 0x%p\n", 1699 sc); 1700 spin_unlock_irqrestore(io_lock, flags); 1701 continue; 1702 } 1703 /* 1704 * Found IO that is still pending with firmware and 1705 * belongs to rport that went away 1706 */ 1707 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 1708 spin_unlock_irqrestore(io_lock, flags); 1709 continue; 1710 } 1711 if (io_req->abts_done) { 1712 shost_printk(KERN_ERR, fnic->lport->host, 1713 "fnic_terminate_rport_io: io_req->abts_done is set " 1714 "state is %s\n", 1715 fnic_ioreq_state_to_str(CMD_STATE(sc))); 1716 } 1717 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) { 1718 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 1719 "fnic_terminate_rport_io " 1720 "IO not yet issued %p tag 0x%x flags " 1721 "%x state %d\n", 1722 sc, tag, CMD_FLAGS(sc), CMD_STATE(sc)); 1723 } 1724 old_ioreq_state = CMD_STATE(sc); 1725 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING; 1726 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE; 1727 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) { 1728 atomic64_inc(&reset_stats->device_reset_terminates); 1729 abt_tag = (tag | FNIC_TAG_DEV_RST); 1730 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1731 "fnic_terminate_rport_io dev rst sc 0x%p\n", sc); 1732 } 1733 1734 BUG_ON(io_req->abts_done); 1735 1736 FNIC_SCSI_DBG(KERN_DEBUG, 1737 fnic->lport->host, 1738 "fnic_terminate_rport_io: Issuing abts\n"); 1739 1740 spin_unlock_irqrestore(io_lock, flags); 1741 1742 /* Now queue the abort command to firmware */ 1743 int_to_scsilun(sc->device->lun, &fc_lun); 1744 1745 if (fnic_queue_abort_io_req(fnic, abt_tag, 1746 FCPIO_ITMF_ABT_TASK_TERM, 1747 fc_lun.scsi_lun, io_req)) { 1748 /* 1749 * Revert the cmd state back to old state, if 1750 * it hasn't changed in between. This cmd will get 1751 * aborted later by scsi_eh, or cleaned up during 1752 * lun reset 1753 */ 1754 spin_lock_irqsave(io_lock, flags); 1755 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) 1756 CMD_STATE(sc) = old_ioreq_state; 1757 spin_unlock_irqrestore(io_lock, flags); 1758 } else { 1759 spin_lock_irqsave(io_lock, flags); 1760 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) 1761 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED; 1762 else 1763 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED; 1764 spin_unlock_irqrestore(io_lock, flags); 1765 atomic64_inc(&term_stats->terminates); 1766 term_cnt++; 1767 } 1768 } 1769 if (term_cnt > atomic64_read(&term_stats->max_terminates)) 1770 atomic64_set(&term_stats->max_terminates, term_cnt); 1771 1772 } 1773 1774 /* 1775 * This function is exported to SCSI for sending abort cmnds. 1776 * A SCSI IO is represented by a io_req in the driver. 1777 * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO. 1778 */ 1779 int fnic_abort_cmd(struct scsi_cmnd *sc) 1780 { 1781 struct fc_lport *lp; 1782 struct fnic *fnic; 1783 struct fnic_io_req *io_req = NULL; 1784 struct fc_rport *rport; 1785 spinlock_t *io_lock; 1786 unsigned long flags; 1787 unsigned long start_time = 0; 1788 int ret = SUCCESS; 1789 u32 task_req = 0; 1790 struct scsi_lun fc_lun; 1791 struct fnic_stats *fnic_stats; 1792 struct abort_stats *abts_stats; 1793 struct terminate_stats *term_stats; 1794 enum fnic_ioreq_state old_ioreq_state; 1795 int tag; 1796 DECLARE_COMPLETION_ONSTACK(tm_done); 1797 1798 /* Wait for rport to unblock */ 1799 fc_block_scsi_eh(sc); 1800 1801 /* Get local-port, check ready and link up */ 1802 lp = shost_priv(sc->device->host); 1803 1804 fnic = lport_priv(lp); 1805 fnic_stats = &fnic->fnic_stats; 1806 abts_stats = &fnic->fnic_stats.abts_stats; 1807 term_stats = &fnic->fnic_stats.term_stats; 1808 1809 rport = starget_to_rport(scsi_target(sc->device)); 1810 tag = sc->request->tag; 1811 FNIC_SCSI_DBG(KERN_DEBUG, 1812 fnic->lport->host, 1813 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n", 1814 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc)); 1815 1816 CMD_FLAGS(sc) = FNIC_NO_FLAGS; 1817 1818 if (lp->state != LPORT_ST_READY || !(lp->link_up)) { 1819 ret = FAILED; 1820 goto fnic_abort_cmd_end; 1821 } 1822 1823 /* 1824 * Avoid a race between SCSI issuing the abort and the device 1825 * completing the command. 1826 * 1827 * If the command is already completed by the fw cmpl code, 1828 * we just return SUCCESS from here. This means that the abort 1829 * succeeded. In the SCSI ML, since the timeout for command has 1830 * happened, the completion wont actually complete the command 1831 * and it will be considered as an aborted command 1832 * 1833 * The CMD_SP will not be cleared except while holding io_req_lock. 1834 */ 1835 io_lock = fnic_io_lock_hash(fnic, sc); 1836 spin_lock_irqsave(io_lock, flags); 1837 io_req = (struct fnic_io_req *)CMD_SP(sc); 1838 if (!io_req) { 1839 spin_unlock_irqrestore(io_lock, flags); 1840 goto fnic_abort_cmd_end; 1841 } 1842 1843 io_req->abts_done = &tm_done; 1844 1845 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 1846 spin_unlock_irqrestore(io_lock, flags); 1847 goto wait_pending; 1848 } 1849 /* 1850 * Command is still pending, need to abort it 1851 * If the firmware completes the command after this point, 1852 * the completion wont be done till mid-layer, since abort 1853 * has already started. 1854 */ 1855 old_ioreq_state = CMD_STATE(sc); 1856 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING; 1857 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE; 1858 1859 spin_unlock_irqrestore(io_lock, flags); 1860 1861 /* 1862 * Check readiness of the remote port. If the path to remote 1863 * port is up, then send abts to the remote port to terminate 1864 * the IO. Else, just locally terminate the IO in the firmware 1865 */ 1866 if (fc_remote_port_chkready(rport) == 0) 1867 task_req = FCPIO_ITMF_ABT_TASK; 1868 else { 1869 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready); 1870 task_req = FCPIO_ITMF_ABT_TASK_TERM; 1871 } 1872 1873 /* Now queue the abort command to firmware */ 1874 int_to_scsilun(sc->device->lun, &fc_lun); 1875 1876 if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req, 1877 fc_lun.scsi_lun, io_req)) { 1878 spin_lock_irqsave(io_lock, flags); 1879 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) 1880 CMD_STATE(sc) = old_ioreq_state; 1881 io_req = (struct fnic_io_req *)CMD_SP(sc); 1882 if (io_req) 1883 io_req->abts_done = NULL; 1884 spin_unlock_irqrestore(io_lock, flags); 1885 ret = FAILED; 1886 goto fnic_abort_cmd_end; 1887 } 1888 if (task_req == FCPIO_ITMF_ABT_TASK) { 1889 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED; 1890 atomic64_inc(&fnic_stats->abts_stats.aborts); 1891 } else { 1892 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED; 1893 atomic64_inc(&fnic_stats->term_stats.terminates); 1894 } 1895 1896 /* 1897 * We queued an abort IO, wait for its completion. 1898 * Once the firmware completes the abort command, it will 1899 * wake up this thread. 1900 */ 1901 wait_pending: 1902 wait_for_completion_timeout(&tm_done, 1903 msecs_to_jiffies 1904 (2 * fnic->config.ra_tov + 1905 fnic->config.ed_tov)); 1906 1907 /* Check the abort status */ 1908 spin_lock_irqsave(io_lock, flags); 1909 1910 io_req = (struct fnic_io_req *)CMD_SP(sc); 1911 if (!io_req) { 1912 atomic64_inc(&fnic_stats->io_stats.ioreq_null); 1913 spin_unlock_irqrestore(io_lock, flags); 1914 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL; 1915 ret = FAILED; 1916 goto fnic_abort_cmd_end; 1917 } 1918 io_req->abts_done = NULL; 1919 1920 /* fw did not complete abort, timed out */ 1921 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) { 1922 spin_unlock_irqrestore(io_lock, flags); 1923 if (task_req == FCPIO_ITMF_ABT_TASK) { 1924 atomic64_inc(&abts_stats->abort_drv_timeouts); 1925 } else { 1926 atomic64_inc(&term_stats->terminate_drv_timeouts); 1927 } 1928 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT; 1929 ret = FAILED; 1930 goto fnic_abort_cmd_end; 1931 } 1932 1933 /* IO out of order */ 1934 1935 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) { 1936 spin_unlock_irqrestore(io_lock, flags); 1937 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1938 "Issuing Host reset due to out of order IO\n"); 1939 1940 if (fnic_host_reset(sc) == FAILED) { 1941 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1942 "fnic_host_reset failed.\n"); 1943 } 1944 ret = FAILED; 1945 goto fnic_abort_cmd_end; 1946 } 1947 1948 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE; 1949 1950 start_time = io_req->start_time; 1951 /* 1952 * firmware completed the abort, check the status, 1953 * free the io_req if successful. If abort fails, 1954 * Device reset will clean the I/O. 1955 */ 1956 if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS) 1957 CMD_SP(sc) = NULL; 1958 else { 1959 ret = FAILED; 1960 spin_unlock_irqrestore(io_lock, flags); 1961 goto fnic_abort_cmd_end; 1962 } 1963 1964 spin_unlock_irqrestore(io_lock, flags); 1965 1966 fnic_release_ioreq_buf(fnic, io_req, sc); 1967 mempool_free(io_req, fnic->io_req_pool); 1968 1969 if (sc->scsi_done) { 1970 /* Call SCSI completion function to complete the IO */ 1971 sc->result = (DID_ABORT << 16); 1972 sc->scsi_done(sc); 1973 } 1974 1975 fnic_abort_cmd_end: 1976 FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no, 1977 sc->request->tag, sc, 1978 jiffies_to_msecs(jiffies - start_time), 1979 0, ((u64)sc->cmnd[0] << 32 | 1980 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 | 1981 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]), 1982 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 1983 1984 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 1985 "Returning from abort cmd type %x %s\n", task_req, 1986 (ret == SUCCESS) ? 1987 "SUCCESS" : "FAILED"); 1988 return ret; 1989 } 1990 1991 static inline int fnic_queue_dr_io_req(struct fnic *fnic, 1992 struct scsi_cmnd *sc, 1993 struct fnic_io_req *io_req) 1994 { 1995 struct vnic_wq_copy *wq = &fnic->wq_copy[0]; 1996 struct Scsi_Host *host = fnic->lport->host; 1997 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats; 1998 struct scsi_lun fc_lun; 1999 int ret = 0; 2000 unsigned long intr_flags; 2001 2002 spin_lock_irqsave(host->host_lock, intr_flags); 2003 if (unlikely(fnic_chk_state_flags_locked(fnic, 2004 FNIC_FLAGS_IO_BLOCKED))) { 2005 spin_unlock_irqrestore(host->host_lock, intr_flags); 2006 return FAILED; 2007 } else 2008 atomic_inc(&fnic->in_flight); 2009 spin_unlock_irqrestore(host->host_lock, intr_flags); 2010 2011 spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags); 2012 2013 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0]) 2014 free_wq_copy_descs(fnic, wq); 2015 2016 if (!vnic_wq_copy_desc_avail(wq)) { 2017 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2018 "queue_dr_io_req failure - no descriptors\n"); 2019 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures); 2020 ret = -EAGAIN; 2021 goto lr_io_req_end; 2022 } 2023 2024 /* fill in the lun info */ 2025 int_to_scsilun(sc->device->lun, &fc_lun); 2026 2027 fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST, 2028 0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG, 2029 fc_lun.scsi_lun, io_req->port_id, 2030 fnic->config.ra_tov, fnic->config.ed_tov); 2031 2032 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs); 2033 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) > 2034 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs)) 2035 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs, 2036 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs)); 2037 2038 lr_io_req_end: 2039 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags); 2040 atomic_dec(&fnic->in_flight); 2041 2042 return ret; 2043 } 2044 2045 /* 2046 * Clean up any pending aborts on the lun 2047 * For each outstanding IO on this lun, whose abort is not completed by fw, 2048 * issue a local abort. Wait for abort to complete. Return 0 if all commands 2049 * successfully aborted, 1 otherwise 2050 */ 2051 static int fnic_clean_pending_aborts(struct fnic *fnic, 2052 struct scsi_cmnd *lr_sc, 2053 bool new_sc) 2054 2055 { 2056 int tag, abt_tag; 2057 struct fnic_io_req *io_req; 2058 spinlock_t *io_lock; 2059 unsigned long flags; 2060 int ret = 0; 2061 struct scsi_cmnd *sc; 2062 struct scsi_lun fc_lun; 2063 struct scsi_device *lun_dev = lr_sc->device; 2064 DECLARE_COMPLETION_ONSTACK(tm_done); 2065 enum fnic_ioreq_state old_ioreq_state; 2066 2067 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) { 2068 io_lock = fnic_io_lock_tag(fnic, tag); 2069 spin_lock_irqsave(io_lock, flags); 2070 sc = scsi_host_find_tag(fnic->lport->host, tag); 2071 /* 2072 * ignore this lun reset cmd if issued using new SC 2073 * or cmds that do not belong to this lun 2074 */ 2075 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) { 2076 spin_unlock_irqrestore(io_lock, flags); 2077 continue; 2078 } 2079 2080 io_req = (struct fnic_io_req *)CMD_SP(sc); 2081 2082 if (!io_req || sc->device != lun_dev) { 2083 spin_unlock_irqrestore(io_lock, flags); 2084 continue; 2085 } 2086 2087 /* 2088 * Found IO that is still pending with firmware and 2089 * belongs to the LUN that we are resetting 2090 */ 2091 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2092 "Found IO in %s on lun\n", 2093 fnic_ioreq_state_to_str(CMD_STATE(sc))); 2094 2095 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) { 2096 spin_unlock_irqrestore(io_lock, flags); 2097 continue; 2098 } 2099 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) && 2100 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) { 2101 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 2102 "%s dev rst not pending sc 0x%p\n", __func__, 2103 sc); 2104 spin_unlock_irqrestore(io_lock, flags); 2105 continue; 2106 } 2107 2108 if (io_req->abts_done) 2109 shost_printk(KERN_ERR, fnic->lport->host, 2110 "%s: io_req->abts_done is set state is %s\n", 2111 __func__, fnic_ioreq_state_to_str(CMD_STATE(sc))); 2112 old_ioreq_state = CMD_STATE(sc); 2113 /* 2114 * Any pending IO issued prior to reset is expected to be 2115 * in abts pending state, if not we need to set 2116 * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending. 2117 * When IO is completed, the IO will be handed over and 2118 * handled in this function. 2119 */ 2120 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING; 2121 2122 BUG_ON(io_req->abts_done); 2123 2124 abt_tag = tag; 2125 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) { 2126 abt_tag |= FNIC_TAG_DEV_RST; 2127 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 2128 "%s: dev rst sc 0x%p\n", __func__, sc); 2129 } 2130 2131 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE; 2132 io_req->abts_done = &tm_done; 2133 spin_unlock_irqrestore(io_lock, flags); 2134 2135 /* Now queue the abort command to firmware */ 2136 int_to_scsilun(sc->device->lun, &fc_lun); 2137 2138 if (fnic_queue_abort_io_req(fnic, abt_tag, 2139 FCPIO_ITMF_ABT_TASK_TERM, 2140 fc_lun.scsi_lun, io_req)) { 2141 spin_lock_irqsave(io_lock, flags); 2142 io_req = (struct fnic_io_req *)CMD_SP(sc); 2143 if (io_req) 2144 io_req->abts_done = NULL; 2145 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) 2146 CMD_STATE(sc) = old_ioreq_state; 2147 spin_unlock_irqrestore(io_lock, flags); 2148 ret = 1; 2149 goto clean_pending_aborts_end; 2150 } else { 2151 spin_lock_irqsave(io_lock, flags); 2152 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) 2153 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED; 2154 spin_unlock_irqrestore(io_lock, flags); 2155 } 2156 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED; 2157 2158 wait_for_completion_timeout(&tm_done, 2159 msecs_to_jiffies 2160 (fnic->config.ed_tov)); 2161 2162 /* Recheck cmd state to check if it is now aborted */ 2163 spin_lock_irqsave(io_lock, flags); 2164 io_req = (struct fnic_io_req *)CMD_SP(sc); 2165 if (!io_req) { 2166 spin_unlock_irqrestore(io_lock, flags); 2167 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL; 2168 continue; 2169 } 2170 2171 io_req->abts_done = NULL; 2172 2173 /* if abort is still pending with fw, fail */ 2174 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) { 2175 spin_unlock_irqrestore(io_lock, flags); 2176 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE; 2177 ret = 1; 2178 goto clean_pending_aborts_end; 2179 } 2180 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE; 2181 2182 /* original sc used for lr is handled by dev reset code */ 2183 if (sc != lr_sc) 2184 CMD_SP(sc) = NULL; 2185 spin_unlock_irqrestore(io_lock, flags); 2186 2187 /* original sc used for lr is handled by dev reset code */ 2188 if (sc != lr_sc) { 2189 fnic_release_ioreq_buf(fnic, io_req, sc); 2190 mempool_free(io_req, fnic->io_req_pool); 2191 } 2192 2193 /* 2194 * Any IO is returned during reset, it needs to call scsi_done 2195 * to return the scsi_cmnd to upper layer. 2196 */ 2197 if (sc->scsi_done) { 2198 /* Set result to let upper SCSI layer retry */ 2199 sc->result = DID_RESET << 16; 2200 sc->scsi_done(sc); 2201 } 2202 } 2203 2204 schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov)); 2205 2206 /* walk again to check, if IOs are still pending in fw */ 2207 if (fnic_is_abts_pending(fnic, lr_sc)) 2208 ret = FAILED; 2209 2210 clean_pending_aborts_end: 2211 return ret; 2212 } 2213 2214 /** 2215 * fnic_scsi_host_start_tag 2216 * Allocates tagid from host's tag list 2217 **/ 2218 static inline int 2219 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc) 2220 { 2221 struct blk_queue_tag *bqt = fnic->lport->host->bqt; 2222 int tag, ret = SCSI_NO_TAG; 2223 2224 BUG_ON(!bqt); 2225 if (!bqt) { 2226 pr_err("Tags are not supported\n"); 2227 goto end; 2228 } 2229 2230 do { 2231 tag = find_next_zero_bit(bqt->tag_map, bqt->max_depth, 1); 2232 if (tag >= bqt->max_depth) { 2233 pr_err("Tag allocation failure\n"); 2234 goto end; 2235 } 2236 } while (test_and_set_bit(tag, bqt->tag_map)); 2237 2238 bqt->tag_index[tag] = sc->request; 2239 sc->request->tag = tag; 2240 sc->tag = tag; 2241 if (!sc->request->special) 2242 sc->request->special = sc; 2243 2244 ret = tag; 2245 2246 end: 2247 return ret; 2248 } 2249 2250 /** 2251 * fnic_scsi_host_end_tag 2252 * frees tag allocated by fnic_scsi_host_start_tag. 2253 **/ 2254 static inline void 2255 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc) 2256 { 2257 struct blk_queue_tag *bqt = fnic->lport->host->bqt; 2258 int tag = sc->request->tag; 2259 2260 if (tag == SCSI_NO_TAG) 2261 return; 2262 2263 BUG_ON(!bqt || !bqt->tag_index[tag]); 2264 if (!bqt) 2265 return; 2266 2267 bqt->tag_index[tag] = NULL; 2268 clear_bit(tag, bqt->tag_map); 2269 2270 return; 2271 } 2272 2273 /* 2274 * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN 2275 * fail to get aborted. It calls driver's eh_device_reset with a SCSI command 2276 * on the LUN. 2277 */ 2278 int fnic_device_reset(struct scsi_cmnd *sc) 2279 { 2280 struct fc_lport *lp; 2281 struct fnic *fnic; 2282 struct fnic_io_req *io_req = NULL; 2283 struct fc_rport *rport; 2284 int status; 2285 int ret = FAILED; 2286 spinlock_t *io_lock; 2287 unsigned long flags; 2288 unsigned long start_time = 0; 2289 struct scsi_lun fc_lun; 2290 struct fnic_stats *fnic_stats; 2291 struct reset_stats *reset_stats; 2292 int tag = 0; 2293 DECLARE_COMPLETION_ONSTACK(tm_done); 2294 int tag_gen_flag = 0; /*to track tags allocated by fnic driver*/ 2295 bool new_sc = 0; 2296 2297 /* Wait for rport to unblock */ 2298 fc_block_scsi_eh(sc); 2299 2300 /* Get local-port, check ready and link up */ 2301 lp = shost_priv(sc->device->host); 2302 2303 fnic = lport_priv(lp); 2304 fnic_stats = &fnic->fnic_stats; 2305 reset_stats = &fnic->fnic_stats.reset_stats; 2306 2307 atomic64_inc(&reset_stats->device_resets); 2308 2309 rport = starget_to_rport(scsi_target(sc->device)); 2310 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2311 "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n", 2312 rport->port_id, sc->device->lun, sc); 2313 2314 if (lp->state != LPORT_ST_READY || !(lp->link_up)) 2315 goto fnic_device_reset_end; 2316 2317 /* Check if remote port up */ 2318 if (fc_remote_port_chkready(rport)) { 2319 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready); 2320 goto fnic_device_reset_end; 2321 } 2322 2323 CMD_FLAGS(sc) = FNIC_DEVICE_RESET; 2324 /* Allocate tag if not present */ 2325 2326 tag = sc->request->tag; 2327 if (unlikely(tag < 0)) { 2328 /* 2329 * XXX(hch): current the midlayer fakes up a struct 2330 * request for the explicit reset ioctls, and those 2331 * don't have a tag allocated to them. The below 2332 * code pokes into midlayer structures to paper over 2333 * this design issue, but that won't work for blk-mq. 2334 * 2335 * Either someone who can actually test the hardware 2336 * will have to come up with a similar hack for the 2337 * blk-mq case, or we'll have to bite the bullet and 2338 * fix the way the EH ioctls work for real, but until 2339 * that happens we fail these explicit requests here. 2340 */ 2341 2342 tag = fnic_scsi_host_start_tag(fnic, sc); 2343 if (unlikely(tag == SCSI_NO_TAG)) 2344 goto fnic_device_reset_end; 2345 tag_gen_flag = 1; 2346 new_sc = 1; 2347 } 2348 io_lock = fnic_io_lock_hash(fnic, sc); 2349 spin_lock_irqsave(io_lock, flags); 2350 io_req = (struct fnic_io_req *)CMD_SP(sc); 2351 2352 /* 2353 * If there is a io_req attached to this command, then use it, 2354 * else allocate a new one. 2355 */ 2356 if (!io_req) { 2357 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC); 2358 if (!io_req) { 2359 spin_unlock_irqrestore(io_lock, flags); 2360 goto fnic_device_reset_end; 2361 } 2362 memset(io_req, 0, sizeof(*io_req)); 2363 io_req->port_id = rport->port_id; 2364 CMD_SP(sc) = (char *)io_req; 2365 } 2366 io_req->dr_done = &tm_done; 2367 CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING; 2368 CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE; 2369 spin_unlock_irqrestore(io_lock, flags); 2370 2371 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag); 2372 2373 /* 2374 * issue the device reset, if enqueue failed, clean up the ioreq 2375 * and break assoc with scsi cmd 2376 */ 2377 if (fnic_queue_dr_io_req(fnic, sc, io_req)) { 2378 spin_lock_irqsave(io_lock, flags); 2379 io_req = (struct fnic_io_req *)CMD_SP(sc); 2380 if (io_req) 2381 io_req->dr_done = NULL; 2382 goto fnic_device_reset_clean; 2383 } 2384 spin_lock_irqsave(io_lock, flags); 2385 CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED; 2386 spin_unlock_irqrestore(io_lock, flags); 2387 2388 /* 2389 * Wait on the local completion for LUN reset. The io_req may be 2390 * freed while we wait since we hold no lock. 2391 */ 2392 wait_for_completion_timeout(&tm_done, 2393 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT)); 2394 2395 spin_lock_irqsave(io_lock, flags); 2396 io_req = (struct fnic_io_req *)CMD_SP(sc); 2397 if (!io_req) { 2398 spin_unlock_irqrestore(io_lock, flags); 2399 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2400 "io_req is null tag 0x%x sc 0x%p\n", tag, sc); 2401 goto fnic_device_reset_end; 2402 } 2403 io_req->dr_done = NULL; 2404 2405 status = CMD_LR_STATUS(sc); 2406 2407 /* 2408 * If lun reset not completed, bail out with failed. io_req 2409 * gets cleaned up during higher levels of EH 2410 */ 2411 if (status == FCPIO_INVALID_CODE) { 2412 atomic64_inc(&reset_stats->device_reset_timeouts); 2413 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2414 "Device reset timed out\n"); 2415 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT; 2416 spin_unlock_irqrestore(io_lock, flags); 2417 int_to_scsilun(sc->device->lun, &fc_lun); 2418 /* 2419 * Issue abort and terminate on device reset request. 2420 * If q'ing of terminate fails, retry it after a delay. 2421 */ 2422 while (1) { 2423 spin_lock_irqsave(io_lock, flags); 2424 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) { 2425 spin_unlock_irqrestore(io_lock, flags); 2426 break; 2427 } 2428 spin_unlock_irqrestore(io_lock, flags); 2429 if (fnic_queue_abort_io_req(fnic, 2430 tag | FNIC_TAG_DEV_RST, 2431 FCPIO_ITMF_ABT_TASK_TERM, 2432 fc_lun.scsi_lun, io_req)) { 2433 wait_for_completion_timeout(&tm_done, 2434 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT)); 2435 } else { 2436 spin_lock_irqsave(io_lock, flags); 2437 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED; 2438 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING; 2439 io_req->abts_done = &tm_done; 2440 spin_unlock_irqrestore(io_lock, flags); 2441 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2442 "Abort and terminate issued on Device reset " 2443 "tag 0x%x sc 0x%p\n", tag, sc); 2444 break; 2445 } 2446 } 2447 while (1) { 2448 spin_lock_irqsave(io_lock, flags); 2449 if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) { 2450 spin_unlock_irqrestore(io_lock, flags); 2451 wait_for_completion_timeout(&tm_done, 2452 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT)); 2453 break; 2454 } else { 2455 io_req = (struct fnic_io_req *)CMD_SP(sc); 2456 io_req->abts_done = NULL; 2457 goto fnic_device_reset_clean; 2458 } 2459 } 2460 } else { 2461 spin_unlock_irqrestore(io_lock, flags); 2462 } 2463 2464 /* Completed, but not successful, clean up the io_req, return fail */ 2465 if (status != FCPIO_SUCCESS) { 2466 spin_lock_irqsave(io_lock, flags); 2467 FNIC_SCSI_DBG(KERN_DEBUG, 2468 fnic->lport->host, 2469 "Device reset completed - failed\n"); 2470 io_req = (struct fnic_io_req *)CMD_SP(sc); 2471 goto fnic_device_reset_clean; 2472 } 2473 2474 /* 2475 * Clean up any aborts on this lun that have still not 2476 * completed. If any of these fail, then LUN reset fails. 2477 * clean_pending_aborts cleans all cmds on this lun except 2478 * the lun reset cmd. If all cmds get cleaned, the lun reset 2479 * succeeds 2480 */ 2481 if (fnic_clean_pending_aborts(fnic, sc, new_sc)) { 2482 spin_lock_irqsave(io_lock, flags); 2483 io_req = (struct fnic_io_req *)CMD_SP(sc); 2484 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2485 "Device reset failed" 2486 " since could not abort all IOs\n"); 2487 goto fnic_device_reset_clean; 2488 } 2489 2490 /* Clean lun reset command */ 2491 spin_lock_irqsave(io_lock, flags); 2492 io_req = (struct fnic_io_req *)CMD_SP(sc); 2493 if (io_req) 2494 /* Completed, and successful */ 2495 ret = SUCCESS; 2496 2497 fnic_device_reset_clean: 2498 if (io_req) 2499 CMD_SP(sc) = NULL; 2500 2501 spin_unlock_irqrestore(io_lock, flags); 2502 2503 if (io_req) { 2504 start_time = io_req->start_time; 2505 fnic_release_ioreq_buf(fnic, io_req, sc); 2506 mempool_free(io_req, fnic->io_req_pool); 2507 } 2508 2509 fnic_device_reset_end: 2510 FNIC_TRACE(fnic_device_reset, sc->device->host->host_no, 2511 sc->request->tag, sc, 2512 jiffies_to_msecs(jiffies - start_time), 2513 0, ((u64)sc->cmnd[0] << 32 | 2514 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 | 2515 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]), 2516 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc))); 2517 2518 /* free tag if it is allocated */ 2519 if (unlikely(tag_gen_flag)) 2520 fnic_scsi_host_end_tag(fnic, sc); 2521 2522 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2523 "Returning from device reset %s\n", 2524 (ret == SUCCESS) ? 2525 "SUCCESS" : "FAILED"); 2526 2527 if (ret == FAILED) 2528 atomic64_inc(&reset_stats->device_reset_failures); 2529 2530 return ret; 2531 } 2532 2533 /* Clean up all IOs, clean up libFC local port */ 2534 int fnic_reset(struct Scsi_Host *shost) 2535 { 2536 struct fc_lport *lp; 2537 struct fnic *fnic; 2538 int ret = 0; 2539 struct reset_stats *reset_stats; 2540 2541 lp = shost_priv(shost); 2542 fnic = lport_priv(lp); 2543 reset_stats = &fnic->fnic_stats.reset_stats; 2544 2545 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2546 "fnic_reset called\n"); 2547 2548 atomic64_inc(&reset_stats->fnic_resets); 2549 2550 /* 2551 * Reset local port, this will clean up libFC exchanges, 2552 * reset remote port sessions, and if link is up, begin flogi 2553 */ 2554 ret = fc_lport_reset(lp); 2555 2556 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2557 "Returning from fnic reset %s\n", 2558 (ret == 0) ? 2559 "SUCCESS" : "FAILED"); 2560 2561 if (ret == 0) 2562 atomic64_inc(&reset_stats->fnic_reset_completions); 2563 else 2564 atomic64_inc(&reset_stats->fnic_reset_failures); 2565 2566 return ret; 2567 } 2568 2569 /* 2570 * SCSI Error handling calls driver's eh_host_reset if all prior 2571 * error handling levels return FAILED. If host reset completes 2572 * successfully, and if link is up, then Fabric login begins. 2573 * 2574 * Host Reset is the highest level of error recovery. If this fails, then 2575 * host is offlined by SCSI. 2576 * 2577 */ 2578 int fnic_host_reset(struct scsi_cmnd *sc) 2579 { 2580 int ret; 2581 unsigned long wait_host_tmo; 2582 struct Scsi_Host *shost = sc->device->host; 2583 struct fc_lport *lp = shost_priv(shost); 2584 struct fnic *fnic = lport_priv(lp); 2585 unsigned long flags; 2586 2587 spin_lock_irqsave(&fnic->fnic_lock, flags); 2588 if (fnic->internal_reset_inprogress == 0) { 2589 fnic->internal_reset_inprogress = 1; 2590 } else { 2591 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2592 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2593 "host reset in progress skipping another host reset\n"); 2594 return SUCCESS; 2595 } 2596 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2597 2598 /* 2599 * If fnic_reset is successful, wait for fabric login to complete 2600 * scsi-ml tries to send a TUR to every device if host reset is 2601 * successful, so before returning to scsi, fabric should be up 2602 */ 2603 ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED; 2604 if (ret == SUCCESS) { 2605 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ; 2606 ret = FAILED; 2607 while (time_before(jiffies, wait_host_tmo)) { 2608 if ((lp->state == LPORT_ST_READY) && 2609 (lp->link_up)) { 2610 ret = SUCCESS; 2611 break; 2612 } 2613 ssleep(1); 2614 } 2615 } 2616 2617 spin_lock_irqsave(&fnic->fnic_lock, flags); 2618 fnic->internal_reset_inprogress = 0; 2619 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2620 return ret; 2621 } 2622 2623 /* 2624 * This fxn is called from libFC when host is removed 2625 */ 2626 void fnic_scsi_abort_io(struct fc_lport *lp) 2627 { 2628 int err = 0; 2629 unsigned long flags; 2630 enum fnic_state old_state; 2631 struct fnic *fnic = lport_priv(lp); 2632 DECLARE_COMPLETION_ONSTACK(remove_wait); 2633 2634 /* Issue firmware reset for fnic, wait for reset to complete */ 2635 retry_fw_reset: 2636 spin_lock_irqsave(&fnic->fnic_lock, flags); 2637 if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) { 2638 /* fw reset is in progress, poll for its completion */ 2639 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2640 schedule_timeout(msecs_to_jiffies(100)); 2641 goto retry_fw_reset; 2642 } 2643 2644 fnic->remove_wait = &remove_wait; 2645 old_state = fnic->state; 2646 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE; 2647 fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr); 2648 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2649 2650 err = fnic_fw_reset_handler(fnic); 2651 if (err) { 2652 spin_lock_irqsave(&fnic->fnic_lock, flags); 2653 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) 2654 fnic->state = old_state; 2655 fnic->remove_wait = NULL; 2656 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2657 return; 2658 } 2659 2660 /* Wait for firmware reset to complete */ 2661 wait_for_completion_timeout(&remove_wait, 2662 msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT)); 2663 2664 spin_lock_irqsave(&fnic->fnic_lock, flags); 2665 fnic->remove_wait = NULL; 2666 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, 2667 "fnic_scsi_abort_io %s\n", 2668 (fnic->state == FNIC_IN_ETH_MODE) ? 2669 "SUCCESS" : "FAILED"); 2670 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2671 2672 } 2673 2674 /* 2675 * This fxn called from libFC to clean up driver IO state on link down 2676 */ 2677 void fnic_scsi_cleanup(struct fc_lport *lp) 2678 { 2679 unsigned long flags; 2680 enum fnic_state old_state; 2681 struct fnic *fnic = lport_priv(lp); 2682 2683 /* issue fw reset */ 2684 retry_fw_reset: 2685 spin_lock_irqsave(&fnic->fnic_lock, flags); 2686 if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) { 2687 /* fw reset is in progress, poll for its completion */ 2688 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2689 schedule_timeout(msecs_to_jiffies(100)); 2690 goto retry_fw_reset; 2691 } 2692 old_state = fnic->state; 2693 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE; 2694 fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr); 2695 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2696 2697 if (fnic_fw_reset_handler(fnic)) { 2698 spin_lock_irqsave(&fnic->fnic_lock, flags); 2699 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) 2700 fnic->state = old_state; 2701 spin_unlock_irqrestore(&fnic->fnic_lock, flags); 2702 } 2703 2704 } 2705 2706 void fnic_empty_scsi_cleanup(struct fc_lport *lp) 2707 { 2708 } 2709 2710 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did) 2711 { 2712 struct fnic *fnic = lport_priv(lp); 2713 2714 /* Non-zero sid, nothing to do */ 2715 if (sid) 2716 goto call_fc_exch_mgr_reset; 2717 2718 if (did) { 2719 fnic_rport_exch_reset(fnic, did); 2720 goto call_fc_exch_mgr_reset; 2721 } 2722 2723 /* 2724 * sid = 0, did = 0 2725 * link down or device being removed 2726 */ 2727 if (!fnic->in_remove) 2728 fnic_scsi_cleanup(lp); 2729 else 2730 fnic_scsi_abort_io(lp); 2731 2732 /* call libFC exch mgr reset to reset its exchanges */ 2733 call_fc_exch_mgr_reset: 2734 fc_exch_mgr_reset(lp, sid, did); 2735 2736 } 2737 2738 /* 2739 * fnic_is_abts_pending() is a helper function that 2740 * walks through tag map to check if there is any IOs pending,if there is one, 2741 * then it returns 1 (true), otherwise 0 (false) 2742 * if @lr_sc is non NULL, then it checks IOs specific to particular LUN, 2743 * otherwise, it checks for all IOs. 2744 */ 2745 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc) 2746 { 2747 int tag; 2748 struct fnic_io_req *io_req; 2749 spinlock_t *io_lock; 2750 unsigned long flags; 2751 int ret = 0; 2752 struct scsi_cmnd *sc; 2753 struct scsi_device *lun_dev = NULL; 2754 2755 if (lr_sc) 2756 lun_dev = lr_sc->device; 2757 2758 /* walk again to check, if IOs are still pending in fw */ 2759 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) { 2760 sc = scsi_host_find_tag(fnic->lport->host, tag); 2761 /* 2762 * ignore this lun reset cmd or cmds that do not belong to 2763 * this lun 2764 */ 2765 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc))) 2766 continue; 2767 2768 io_lock = fnic_io_lock_hash(fnic, sc); 2769 spin_lock_irqsave(io_lock, flags); 2770 2771 io_req = (struct fnic_io_req *)CMD_SP(sc); 2772 2773 if (!io_req || sc->device != lun_dev) { 2774 spin_unlock_irqrestore(io_lock, flags); 2775 continue; 2776 } 2777 2778 /* 2779 * Found IO that is still pending with firmware and 2780 * belongs to the LUN that we are resetting 2781 */ 2782 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host, 2783 "Found IO in %s on lun\n", 2784 fnic_ioreq_state_to_str(CMD_STATE(sc))); 2785 2786 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) 2787 ret = 1; 2788 spin_unlock_irqrestore(io_lock, flags); 2789 } 2790 2791 return ret; 2792 } 2793