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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright(c) 2007 Intel Corporation. All rights reserved.4 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.5 * Copyright(c) 2008 Mike Christie6 *7 * Maintained at www.Open-FCoE.org8 */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 30#include "fc_encode.h"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 48static struct libfc_cmd_priv *libfc_priv(struct scsi_cmnd *cmd)49{50 return scsi_cmd_priv(cmd);51}52 53/**54 * struct fc_fcp_internal - FCP layer internal data55 * @scsi_pkt_pool: Memory pool to draw FCP packets from56 * @scsi_queue_lock: Protects the scsi_pkt_queue57 * @scsi_pkt_queue: Current FCP packets58 * @last_can_queue_ramp_down_time: ramp down time59 * @last_can_queue_ramp_up_time: ramp up time60 * @max_can_queue: max can_queue size61 */62struct fc_fcp_internal {63 mempool_t *scsi_pkt_pool;64 spinlock_t scsi_queue_lock;65 struct list_head scsi_pkt_queue;66 unsigned long last_can_queue_ramp_down_time;67 unsigned long last_can_queue_ramp_up_time;68 int max_can_queue;69};70 71#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)72 73/*74 * function prototypes75 * FC scsi I/O related functions76 */77static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);78static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);79static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);80static void fc_fcp_complete_locked(struct fc_fcp_pkt *);81static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);82static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);83static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);84static void fc_fcp_timeout(struct timer_list *);85static void fc_fcp_rec(struct fc_fcp_pkt *);86static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);87static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);88static void fc_io_compl(struct fc_fcp_pkt *);89 90static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);91static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);92static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);93 94/*95 * command status codes96 */97#define FC_COMPLETE 098#define FC_CMD_ABORTED 199#define FC_CMD_RESET 2100#define FC_CMD_PLOGO 3101#define FC_SNS_RCV 4102#define FC_TRANS_ERR 5103#define FC_DATA_OVRRUN 6104#define FC_DATA_UNDRUN 7105#define FC_ERROR 8106#define FC_HRD_ERROR 9107#define FC_CRC_ERROR 10108#define FC_TIMED_OUT 11109#define FC_TRANS_RESET 12110 111/*112 * Error recovery timeout values.113 */114#define FC_SCSI_TM_TOV (10 * HZ)115#define FC_HOST_RESET_TIMEOUT (30 * HZ)116#define FC_CAN_QUEUE_PERIOD (60 * HZ)117 118#define FC_MAX_ERROR_CNT 5119#define FC_MAX_RECOV_RETRY 3120 121#define FC_FCP_DFLT_QUEUE_DEPTH 32122 123/**124 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt125 * @lport: The local port that the FCP packet is for126 * @gfp: GFP flags for allocation127 *128 * Return value: fcp_pkt structure or null on allocation failure.129 * Context: Can be called from process context, no lock is required.130 */131static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)132{133 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);134 struct fc_fcp_pkt *fsp;135 136 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);137 if (fsp) {138 memset(fsp, 0, sizeof(*fsp));139 fsp->lp = lport;140 fsp->xfer_ddp = FC_XID_UNKNOWN;141 refcount_set(&fsp->ref_cnt, 1);142 timer_setup(&fsp->timer, NULL, 0);143 INIT_LIST_HEAD(&fsp->list);144 spin_lock_init(&fsp->scsi_pkt_lock);145 } else {146 this_cpu_inc(lport->stats->FcpPktAllocFails);147 }148 return fsp;149}150 151/**152 * fc_fcp_pkt_release() - Release hold on a fcp_pkt153 * @fsp: The FCP packet to be released154 *155 * Context: Can be called from process or interrupt context,156 * no lock is required.157 */158static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)159{160 if (refcount_dec_and_test(&fsp->ref_cnt)) {161 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);162 163 mempool_free(fsp, si->scsi_pkt_pool);164 }165}166 167/**168 * fc_fcp_pkt_hold() - Hold a fcp_pkt169 * @fsp: The FCP packet to be held170 */171static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)172{173 refcount_inc(&fsp->ref_cnt);174}175 176/**177 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt178 * @seq: The sequence that the FCP packet is on (required by destructor API)179 * @fsp: The FCP packet to be released180 *181 * This routine is called by a destructor callback in the fc_exch_seq_send()182 * routine of the libfc Transport Template. The 'struct fc_seq' is a required183 * argument even though it is not used by this routine.184 *185 * Context: No locking required.186 */187static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)188{189 fc_fcp_pkt_release(fsp);190}191 192/**193 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count194 * @fsp: The FCP packet to be locked and incremented195 *196 * We should only return error if we return a command to SCSI-ml before197 * getting a response. This can happen in cases where we send a abort, but198 * do not wait for the response and the abort and command can be passing199 * each other on the wire/network-layer.200 *201 * Note: this function locks the packet and gets a reference to allow202 * callers to call the completion function while the lock is held and203 * not have to worry about the packets refcount.204 *205 * TODO: Maybe we should just have callers grab/release the lock and206 * have a function that they call to verify the fsp and grab a ref if207 * needed.208 */209static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)210{211 spin_lock_bh(&fsp->scsi_pkt_lock);212 if (fsp->state & FC_SRB_COMPL) {213 spin_unlock_bh(&fsp->scsi_pkt_lock);214 return -EPERM;215 }216 217 fc_fcp_pkt_hold(fsp);218 return 0;219}220 221/**222 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its223 * reference count224 * @fsp: The FCP packet to be unlocked and decremented225 */226static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)227{228 spin_unlock_bh(&fsp->scsi_pkt_lock);229 fc_fcp_pkt_release(fsp);230}231 232/**233 * fc_fcp_timer_set() - Start a timer for a fcp_pkt234 * @fsp: The FCP packet to start a timer for235 * @delay: The timeout period in jiffies236 */237static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)238{239 if (!(fsp->state & FC_SRB_COMPL)) {240 mod_timer(&fsp->timer, jiffies + delay);241 fsp->timer_delay = delay;242 }243}244 245static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp)246{247 fsp->state |= FC_SRB_ABORTED;248 fsp->state &= ~FC_SRB_ABORT_PENDING;249 250 if (fsp->wait_for_comp)251 complete(&fsp->tm_done);252 else253 fc_fcp_complete_locked(fsp);254}255 256/**257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a258 * fcp_pkt259 * @fsp: The FCP packet to abort exchanges on260 */261static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)262{263 int rc;264 265 if (!fsp->seq_ptr)266 return -EINVAL;267 268 if (fsp->state & FC_SRB_ABORT_PENDING) {269 FC_FCP_DBG(fsp, "abort already pending\n");270 return -EBUSY;271 }272 273 this_cpu_inc(fsp->lp->stats->FcpPktAborts);274 275 fsp->state |= FC_SRB_ABORT_PENDING;276 rc = fc_seq_exch_abort(fsp->seq_ptr, 0);277 /*278 * fc_seq_exch_abort() might return -ENXIO if279 * the sequence is already completed280 */281 if (rc == -ENXIO) {282 fc_fcp_abort_done(fsp);283 rc = 0;284 }285 return rc;286}287 288/**289 * fc_fcp_retry_cmd() - Retry a fcp_pkt290 * @fsp: The FCP packet to be retried291 * @status_code: The FCP status code to set292 *293 * Sets the status code to be FC_ERROR and then calls294 * fc_fcp_complete_locked() which in turn calls fc_io_compl().295 * fc_io_compl() will notify the SCSI-ml that the I/O is done.296 * The SCSI-ml will retry the command.297 */298static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code)299{300 if (fsp->seq_ptr) {301 fc_exch_done(fsp->seq_ptr);302 fsp->seq_ptr = NULL;303 }304 305 fsp->state &= ~FC_SRB_ABORT_PENDING;306 fsp->io_status = 0;307 fsp->status_code = status_code;308 fc_fcp_complete_locked(fsp);309}310 311/**312 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context313 * @fsp: The FCP packet that will manage the DDP frames314 * @xid: The XID that will be used for the DDP exchange315 */316void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)317{318 struct fc_lport *lport;319 320 lport = fsp->lp;321 if ((fsp->req_flags & FC_SRB_READ) &&322 (lport->lro_enabled) && (lport->tt.ddp_setup)) {323 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),324 scsi_sg_count(fsp->cmd)))325 fsp->xfer_ddp = xid;326 }327}328 329/**330 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any331 * DDP related resources for a fcp_pkt332 * @fsp: The FCP packet that DDP had been used on333 */334void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)335{336 struct fc_lport *lport;337 338 if (!fsp)339 return;340 341 if (fsp->xfer_ddp == FC_XID_UNKNOWN)342 return;343 344 lport = fsp->lp;345 if (lport->tt.ddp_done) {346 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);347 fsp->xfer_ddp = FC_XID_UNKNOWN;348 }349}350 351/**352 * fc_fcp_can_queue_ramp_up() - increases can_queue353 * @lport: lport to ramp up can_queue354 */355static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)356{357 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);358 unsigned long flags;359 int can_queue;360 361 spin_lock_irqsave(lport->host->host_lock, flags);362 363 if (si->last_can_queue_ramp_up_time &&364 (time_before(jiffies, si->last_can_queue_ramp_up_time +365 FC_CAN_QUEUE_PERIOD)))366 goto unlock;367 368 if (time_before(jiffies, si->last_can_queue_ramp_down_time +369 FC_CAN_QUEUE_PERIOD))370 goto unlock;371 372 si->last_can_queue_ramp_up_time = jiffies;373 374 can_queue = lport->host->can_queue << 1;375 if (can_queue >= si->max_can_queue) {376 can_queue = si->max_can_queue;377 si->last_can_queue_ramp_down_time = 0;378 }379 lport->host->can_queue = can_queue;380 shost_printk(KERN_ERR, lport->host, "libfc: increased "381 "can_queue to %d.\n", can_queue);382 383unlock:384 spin_unlock_irqrestore(lport->host->host_lock, flags);385}386 387/**388 * fc_fcp_can_queue_ramp_down() - reduces can_queue389 * @lport: lport to reduce can_queue390 *391 * If we are getting memory allocation failures, then we may392 * be trying to execute too many commands. We let the running393 * commands complete or timeout, then try again with a reduced394 * can_queue. Eventually we will hit the point where we run395 * on all reserved structs.396 */397static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport)398{399 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);400 unsigned long flags;401 int can_queue;402 bool changed = false;403 404 spin_lock_irqsave(lport->host->host_lock, flags);405 406 if (si->last_can_queue_ramp_down_time &&407 (time_before(jiffies, si->last_can_queue_ramp_down_time +408 FC_CAN_QUEUE_PERIOD)))409 goto unlock;410 411 si->last_can_queue_ramp_down_time = jiffies;412 413 can_queue = lport->host->can_queue;414 can_queue >>= 1;415 if (!can_queue)416 can_queue = 1;417 lport->host->can_queue = can_queue;418 changed = true;419 420unlock:421 spin_unlock_irqrestore(lport->host->host_lock, flags);422 return changed;423}424 425/*426 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.427 * @lport: fc lport struct428 * @len: payload length429 *430 * Allocates fc_frame structure and buffer but if fails to allocate431 * then reduce can_queue.432 */433static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,434 size_t len)435{436 struct fc_frame *fp;437 438 fp = fc_frame_alloc(lport, len);439 if (likely(fp))440 return fp;441 442 this_cpu_inc(lport->stats->FcpFrameAllocFails);443 /* error case */444 fc_fcp_can_queue_ramp_down(lport);445 shost_printk(KERN_ERR, lport->host,446 "libfc: Could not allocate frame, "447 "reducing can_queue to %d.\n", lport->host->can_queue);448 return NULL;449}450 451/**452 * get_fsp_rec_tov() - Helper function to get REC_TOV453 * @fsp: the FCP packet454 *455 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second456 */457static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)458{459 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;460 unsigned int e_d_tov = FC_DEF_E_D_TOV;461 462 if (rpriv && rpriv->e_d_tov > e_d_tov)463 e_d_tov = rpriv->e_d_tov;464 return msecs_to_jiffies(e_d_tov) + HZ;465}466 467/**468 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target469 * @fsp: The FCP packet the data is on470 * @fp: The data frame471 */472static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)473{474 struct scsi_cmnd *sc = fsp->cmd;475 struct fc_lport *lport = fsp->lp;476 struct fc_frame_header *fh;477 size_t start_offset;478 size_t offset;479 u32 crc;480 u32 copy_len = 0;481 size_t len;482 void *buf;483 struct scatterlist *sg;484 u32 nents;485 u8 host_bcode = FC_COMPLETE;486 487 fh = fc_frame_header_get(fp);488 offset = ntohl(fh->fh_parm_offset);489 start_offset = offset;490 len = fr_len(fp) - sizeof(*fh);491 buf = fc_frame_payload_get(fp, 0);492 493 /*494 * if this I/O is ddped then clear it and initiate recovery since data495 * frames are expected to be placed directly in that case.496 *497 * Indicate error to scsi-ml because something went wrong with the498 * ddp handling to get us here.499 */500 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {501 fc_fcp_ddp_done(fsp);502 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");503 host_bcode = FC_ERROR;504 goto err;505 }506 if (offset + len > fsp->data_len) {507 /* this should never happen */508 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&509 fc_frame_crc_check(fp))510 goto crc_err;511 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "512 "data_len %x\n", len, offset, fsp->data_len);513 514 /* Data is corrupted indicate scsi-ml should retry */515 host_bcode = FC_DATA_OVRRUN;516 goto err;517 }518 if (offset != fsp->xfer_len)519 fsp->state |= FC_SRB_DISCONTIG;520 521 sg = scsi_sglist(sc);522 nents = scsi_sg_count(sc);523 524 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {525 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,526 &offset, NULL);527 } else {528 crc = crc32(~0, (u8 *) fh, sizeof(*fh));529 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,530 &offset, &crc);531 buf = fc_frame_payload_get(fp, 0);532 if (len % 4)533 crc = crc32(crc, buf + len, 4 - (len % 4));534 535 if (~crc != le32_to_cpu(fr_crc(fp))) {536crc_err:537 this_cpu_inc(lport->stats->ErrorFrames);538 /* per cpu count, not total count, but OK for limit */539 if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < FC_MAX_ERROR_CNT)540 printk(KERN_WARNING "libfc: CRC error on data "541 "frame for port (%6.6x)\n",542 lport->port_id);543 /*544 * Assume the frame is total garbage.545 * We may have copied it over the good part546 * of the buffer.547 * If so, we need to retry the entire operation.548 * Otherwise, ignore it.549 */550 if (fsp->state & FC_SRB_DISCONTIG) {551 host_bcode = FC_CRC_ERROR;552 goto err;553 }554 return;555 }556 }557 558 if (fsp->xfer_contig_end == start_offset)559 fsp->xfer_contig_end += copy_len;560 fsp->xfer_len += copy_len;561 562 /*563 * In the very rare event that this data arrived after the response564 * and completes the transfer, call the completion handler.565 */566 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&567 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) {568 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" );569 fc_fcp_complete_locked(fsp);570 }571 return;572err:573 fc_fcp_recovery(fsp, host_bcode);574}575 576/**577 * fc_fcp_send_data() - Send SCSI data to a target578 * @fsp: The FCP packet the data is on579 * @seq: The sequence the data is to be sent on580 * @offset: The starting offset for this data request581 * @seq_blen: The burst length for this data request582 *583 * Called after receiving a Transfer Ready data descriptor.584 * If the LLD is capable of sequence offload then send down the585 * seq_blen amount of data in single frame, otherwise send586 * multiple frames of the maximum frame payload supported by587 * the target port.588 */589static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,590 size_t offset, size_t seq_blen)591{592 struct fc_exch *ep;593 struct scsi_cmnd *sc;594 struct scatterlist *sg;595 struct fc_frame *fp = NULL;596 struct fc_lport *lport = fsp->lp;597 struct page *page;598 size_t remaining;599 size_t t_blen;600 size_t tlen;601 size_t sg_bytes;602 size_t frame_offset, fh_parm_offset;603 size_t off;604 int error;605 void *data = NULL;606 void *page_addr;607 int using_sg = lport->sg_supp;608 u32 f_ctl;609 610 WARN_ON(seq_blen <= 0);611 if (unlikely(offset + seq_blen > fsp->data_len)) {612 /* this should never happen */613 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "614 "offset %zx\n", seq_blen, offset);615 fc_fcp_send_abort(fsp);616 return 0;617 } else if (offset != fsp->xfer_len) {618 /* Out of Order Data Request - no problem, but unexpected. */619 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "620 "seq_blen %zx offset %zx\n", seq_blen, offset);621 }622 623 /*624 * if LLD is capable of seq_offload then set transport625 * burst length (t_blen) to seq_blen, otherwise set t_blen626 * to max FC frame payload previously set in fsp->max_payload.627 */628 t_blen = fsp->max_payload;629 if (lport->seq_offload) {630 t_blen = min(seq_blen, (size_t)lport->lso_max);631 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",632 fsp, seq_blen, lport->lso_max, t_blen);633 }634 635 if (t_blen > 512)636 t_blen &= ~(512 - 1); /* round down to block size */637 sc = fsp->cmd;638 639 remaining = seq_blen;640 fh_parm_offset = frame_offset = offset;641 tlen = 0;642 seq = fc_seq_start_next(seq);643 f_ctl = FC_FC_REL_OFF;644 WARN_ON(!seq);645 646 sg = scsi_sglist(sc);647 648 while (remaining > 0 && sg) {649 if (offset >= sg->length) {650 offset -= sg->length;651 sg = sg_next(sg);652 continue;653 }654 if (!fp) {655 tlen = min(t_blen, remaining);656 657 /*658 * TODO. Temporary workaround. fc_seq_send() can't659 * handle odd lengths in non-linear skbs.660 * This will be the final fragment only.661 */662 if (tlen % 4)663 using_sg = 0;664 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);665 if (!fp)666 return -ENOMEM;667 668 data = fc_frame_header_get(fp) + 1;669 fh_parm_offset = frame_offset;670 fr_max_payload(fp) = fsp->max_payload;671 }672 673 off = offset + sg->offset;674 sg_bytes = min(tlen, sg->length - offset);675 sg_bytes = min(sg_bytes,676 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));677 page = sg_page(sg) + (off >> PAGE_SHIFT);678 if (using_sg) {679 get_page(page);680 skb_fill_page_desc(fp_skb(fp),681 skb_shinfo(fp_skb(fp))->nr_frags,682 page, off & ~PAGE_MASK, sg_bytes);683 fp_skb(fp)->data_len += sg_bytes;684 fr_len(fp) += sg_bytes;685 fp_skb(fp)->truesize += PAGE_SIZE;686 } else {687 /*688 * The scatterlist item may be bigger than PAGE_SIZE,689 * but we must not cross pages inside the kmap.690 */691 page_addr = kmap_atomic(page);692 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),693 sg_bytes);694 kunmap_atomic(page_addr);695 data += sg_bytes;696 }697 offset += sg_bytes;698 frame_offset += sg_bytes;699 tlen -= sg_bytes;700 remaining -= sg_bytes;701 702 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&703 (tlen))704 continue;705 706 /*707 * Send sequence with transfer sequence initiative in case708 * this is last FCP frame of the sequence.709 */710 if (remaining == 0)711 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;712 713 ep = fc_seq_exch(seq);714 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,715 FC_TYPE_FCP, f_ctl, fh_parm_offset);716 717 /*718 * send fragment using for a sequence.719 */720 error = fc_seq_send(lport, seq, fp);721 if (error) {722 WARN_ON(1); /* send error should be rare */723 return error;724 }725 fp = NULL;726 }727 fsp->xfer_len += seq_blen; /* premature count? */728 return 0;729}730 731/**732 * fc_fcp_abts_resp() - Receive an ABTS response733 * @fsp: The FCP packet that is being aborted734 * @fp: The response frame735 */736static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)737{738 int ba_done = 1;739 struct fc_ba_rjt *brp;740 struct fc_frame_header *fh;741 742 fh = fc_frame_header_get(fp);743 switch (fh->fh_r_ctl) {744 case FC_RCTL_BA_ACC:745 break;746 case FC_RCTL_BA_RJT:747 brp = fc_frame_payload_get(fp, sizeof(*brp));748 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)749 break;750 fallthrough;751 default:752 /*753 * we will let the command timeout754 * and scsi-ml recover in this case,755 * therefore cleared the ba_done flag.756 */757 ba_done = 0;758 }759 760 if (ba_done)761 fc_fcp_abort_done(fsp);762}763 764/**765 * fc_fcp_recv() - Receive an FCP frame766 * @seq: The sequence the frame is on767 * @fp: The received frame768 * @arg: The related FCP packet769 *770 * Context: Called from Soft IRQ context. Can not be called771 * holding the FCP packet list lock.772 */773static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)774{775 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;776 struct fc_lport *lport = fsp->lp;777 struct fc_frame_header *fh;778 struct fcp_txrdy *dd;779 u8 r_ctl;780 int rc = 0;781 782 if (IS_ERR(fp)) {783 fc_fcp_error(fsp, fp);784 return;785 }786 787 fh = fc_frame_header_get(fp);788 r_ctl = fh->fh_r_ctl;789 790 if (lport->state != LPORT_ST_READY) {791 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n",792 lport->state, r_ctl);793 goto out;794 }795 if (fc_fcp_lock_pkt(fsp))796 goto out;797 798 if (fh->fh_type == FC_TYPE_BLS) {799 fc_fcp_abts_resp(fsp, fp);800 goto unlock;801 }802 803 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) {804 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl);805 goto unlock;806 }807 808 if (r_ctl == FC_RCTL_DD_DATA_DESC) {809 /*810 * received XFER RDY from the target811 * need to send data to the target812 */813 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);814 dd = fc_frame_payload_get(fp, sizeof(*dd));815 WARN_ON(!dd);816 817 rc = fc_fcp_send_data(fsp, seq,818 (size_t) ntohl(dd->ft_data_ro),819 (size_t) ntohl(dd->ft_burst_len));820 if (!rc)821 seq->rec_data = fsp->xfer_len;822 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {823 /*824 * received a DATA frame825 * next we will copy the data to the system buffer826 */827 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */828 fc_fcp_recv_data(fsp, fp);829 seq->rec_data = fsp->xfer_contig_end;830 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {831 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);832 833 fc_fcp_resp(fsp, fp);834 } else {835 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);836 }837unlock:838 fc_fcp_unlock_pkt(fsp);839out:840 fc_frame_free(fp);841}842 843/**844 * fc_fcp_resp() - Handler for FCP responses845 * @fsp: The FCP packet the response is for846 * @fp: The response frame847 */848static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)849{850 struct fc_frame_header *fh;851 struct fcp_resp *fc_rp;852 struct fcp_resp_ext *rp_ex;853 struct fcp_resp_rsp_info *fc_rp_info;854 u32 plen;855 u32 expected_len;856 u32 respl = 0;857 u32 snsl = 0;858 u8 flags = 0;859 860 plen = fr_len(fp);861 fh = (struct fc_frame_header *)fr_hdr(fp);862 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))863 goto len_err;864 plen -= sizeof(*fh);865 fc_rp = (struct fcp_resp *)(fh + 1);866 fsp->cdb_status = fc_rp->fr_status;867 flags = fc_rp->fr_flags;868 fsp->scsi_comp_flags = flags;869 expected_len = fsp->data_len;870 871 /* if ddp, update xfer len */872 fc_fcp_ddp_done(fsp);873 874 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {875 rp_ex = (void *)(fc_rp + 1);876 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {877 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))878 goto len_err;879 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);880 if (flags & FCP_RSP_LEN_VAL) {881 respl = ntohl(rp_ex->fr_rsp_len);882 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&883 (respl != FCP_RESP_RSP_INFO_LEN8))884 goto len_err;885 if (fsp->wait_for_comp) {886 /* Abuse cdb_status for rsp code */887 fsp->cdb_status = fc_rp_info->rsp_code;888 complete(&fsp->tm_done);889 /*890 * tmfs will not have any scsi cmd so891 * exit here892 */893 return;894 }895 }896 if (flags & FCP_SNS_LEN_VAL) {897 snsl = ntohl(rp_ex->fr_sns_len);898 if (snsl > SCSI_SENSE_BUFFERSIZE)899 snsl = SCSI_SENSE_BUFFERSIZE;900 memcpy(fsp->cmd->sense_buffer,901 (char *)fc_rp_info + respl, snsl);902 }903 }904 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {905 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))906 goto len_err;907 if (flags & FCP_RESID_UNDER) {908 fsp->scsi_resid = ntohl(rp_ex->fr_resid);909 /*910 * The cmnd->underflow is the minimum number of911 * bytes that must be transferred for this912 * command. Provided a sense condition is not913 * present, make sure the actual amount914 * transferred is at least the underflow value915 * or fail.916 */917 if (!(flags & FCP_SNS_LEN_VAL) &&918 (fc_rp->fr_status == 0) &&919 (scsi_bufflen(fsp->cmd) -920 fsp->scsi_resid) < fsp->cmd->underflow)921 goto err;922 expected_len -= fsp->scsi_resid;923 } else {924 fsp->status_code = FC_ERROR;925 }926 }927 }928 fsp->state |= FC_SRB_RCV_STATUS;929 930 /*931 * Check for missing or extra data frames.932 */933 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD &&934 fsp->xfer_len != expected_len)) {935 if (fsp->xfer_len < expected_len) {936 /*937 * Some data may be queued locally,938 * Wait a at least one jiffy to see if it is delivered.939 * If this expires without data, we may do SRR.940 */941 if (fsp->lp->qfull) {942 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n",943 fsp->rport->port_id);944 return;945 }946 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun "947 "len %x, data len %x\n",948 fsp->rport->port_id,949 fsp->xfer_len, expected_len, fsp->data_len);950 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));951 return;952 }953 fsp->status_code = FC_DATA_OVRRUN;954 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "955 "len %x, data len %x\n",956 fsp->rport->port_id,957 fsp->xfer_len, expected_len, fsp->data_len);958 }959 fc_fcp_complete_locked(fsp);960 return;961 962len_err:963 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "964 "snsl %u\n", flags, fr_len(fp), respl, snsl);965err:966 fsp->status_code = FC_ERROR;967 fc_fcp_complete_locked(fsp);968}969 970/**971 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the972 * fcp_pkt lock held973 * @fsp: The FCP packet to be completed974 *975 * This function may sleep if a timer is pending. The packet lock must be976 * held, and the host lock must not be held.977 */978static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)979{980 struct fc_lport *lport = fsp->lp;981 struct fc_seq *seq;982 struct fc_exch *ep;983 u32 f_ctl;984 985 if (fsp->state & FC_SRB_ABORT_PENDING)986 return;987 988 if (fsp->state & FC_SRB_ABORTED) {989 if (!fsp->status_code)990 fsp->status_code = FC_CMD_ABORTED;991 } else {992 /*993 * Test for transport underrun, independent of response994 * underrun status.995 */996 if (fsp->cdb_status == SAM_STAT_GOOD &&997 fsp->xfer_len < fsp->data_len && !fsp->io_status &&998 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||999 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {1000 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n",1001 fsp->xfer_len, fsp->data_len);1002 fsp->status_code = FC_DATA_UNDRUN;1003 }1004 }1005 1006 seq = fsp->seq_ptr;1007 if (seq) {1008 fsp->seq_ptr = NULL;1009 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {1010 struct fc_frame *conf_frame;1011 struct fc_seq *csp;1012 1013 csp = fc_seq_start_next(seq);1014 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);1015 if (conf_frame) {1016 f_ctl = FC_FC_SEQ_INIT;1017 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;1018 ep = fc_seq_exch(seq);1019 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,1020 ep->did, ep->sid,1021 FC_TYPE_FCP, f_ctl, 0);1022 fc_seq_send(lport, csp, conf_frame);1023 }1024 }1025 fc_exch_done(seq);1026 }1027 /*1028 * Some resets driven by SCSI are not I/Os and do not have1029 * SCSI commands associated with the requests. We should not1030 * call I/O completion if we do not have a SCSI command.1031 */1032 if (fsp->cmd)1033 fc_io_compl(fsp);1034}1035 1036/**1037 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt1038 * @fsp: The FCP packet whose exchanges should be canceled1039 * @error: The reason for the cancellation1040 */1041static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)1042{1043 if (fsp->seq_ptr) {1044 fc_exch_done(fsp->seq_ptr);1045 fsp->seq_ptr = NULL;1046 }1047 fsp->status_code = error;1048}1049 1050/**1051 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port1052 * @lport: The local port whose exchanges should be canceled1053 * @id: The target's ID1054 * @lun: The LUN1055 * @error: The reason for cancellation1056 *1057 * If lun or id is -1, they are ignored.1058 */1059static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,1060 unsigned int lun, int error)1061{1062 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);1063 struct fc_fcp_pkt *fsp;1064 struct scsi_cmnd *sc_cmd;1065 unsigned long flags;1066 1067 spin_lock_irqsave(&si->scsi_queue_lock, flags);1068restart:1069 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {1070 sc_cmd = fsp->cmd;1071 if (id != -1 && scmd_id(sc_cmd) != id)1072 continue;1073 1074 if (lun != -1 && sc_cmd->device->lun != lun)1075 continue;1076 1077 fc_fcp_pkt_hold(fsp);1078 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);1079 1080 spin_lock_bh(&fsp->scsi_pkt_lock);1081 if (!(fsp->state & FC_SRB_COMPL)) {1082 fsp->state |= FC_SRB_COMPL;1083 /*1084 * TODO: dropping scsi_pkt_lock and then reacquiring1085 * again around fc_fcp_cleanup_cmd() is required,1086 * since fc_fcp_cleanup_cmd() calls into1087 * fc_seq_set_resp() and that func preempts cpu using1088 * schedule. May be schedule and related code should be1089 * removed instead of unlocking here to avoid scheduling1090 * while atomic bug.1091 */1092 spin_unlock_bh(&fsp->scsi_pkt_lock);1093 1094 fc_fcp_cleanup_cmd(fsp, error);1095 1096 spin_lock_bh(&fsp->scsi_pkt_lock);1097 fc_io_compl(fsp);1098 }1099 spin_unlock_bh(&fsp->scsi_pkt_lock);1100 1101 fc_fcp_pkt_release(fsp);1102 spin_lock_irqsave(&si->scsi_queue_lock, flags);1103 /*1104 * while we dropped the lock multiple pkts could1105 * have been released, so we have to start over.1106 */1107 goto restart;1108 }1109 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);1110}1111 1112/**1113 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port1114 * @lport: The local port whose exchanges are to be aborted1115 */1116static void fc_fcp_abort_io(struct fc_lport *lport)1117{1118 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);1119}1120 1121/**1122 * fc_fcp_pkt_send() - Send a fcp_pkt1123 * @lport: The local port to send the FCP packet on1124 * @fsp: The FCP packet to send1125 *1126 * Return: Zero for success and -1 for failure1127 * Locks: Called without locks held1128 */1129static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)1130{1131 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);1132 unsigned long flags;1133 int rc;1134 1135 libfc_priv(fsp->cmd)->fsp = fsp;1136 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);1137 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;1138 1139 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);1140 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);1141 1142 spin_lock_irqsave(&si->scsi_queue_lock, flags);1143 list_add_tail(&fsp->list, &si->scsi_pkt_queue);1144 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);1145 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);1146 if (unlikely(rc)) {1147 spin_lock_irqsave(&si->scsi_queue_lock, flags);1148 libfc_priv(fsp->cmd)->fsp = NULL;1149 list_del(&fsp->list);1150 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);1151 }1152 1153 return rc;1154}1155 1156/**1157 * fc_fcp_cmd_send() - Send a FCP command1158 * @lport: The local port to send the command on1159 * @fsp: The FCP packet the command is on1160 * @resp: The handler for the response1161 */1162static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,1163 void (*resp)(struct fc_seq *,1164 struct fc_frame *fp,1165 void *arg))1166{1167 struct fc_frame *fp;1168 struct fc_seq *seq;1169 struct fc_rport *rport;1170 struct fc_rport_libfc_priv *rpriv;1171 const size_t len = sizeof(fsp->cdb_cmd);1172 int rc = 0;1173 1174 if (fc_fcp_lock_pkt(fsp))1175 return 0;1176 1177 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));1178 if (!fp) {1179 rc = -1;1180 goto unlock;1181 }1182 1183 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);1184 fr_fsp(fp) = fsp;1185 rport = fsp->rport;1186 fsp->max_payload = rport->maxframe_size;1187 rpriv = rport->dd_data;1188 1189 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,1190 rpriv->local_port->port_id, FC_TYPE_FCP,1191 FC_FCTL_REQ, 0);1192 1193 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0);1194 if (!seq) {1195 rc = -1;1196 goto unlock;1197 }1198 fsp->seq_ptr = seq;1199 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */1200 1201 fsp->timer.function = fc_fcp_timeout;1202 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)1203 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));1204 1205unlock:1206 fc_fcp_unlock_pkt(fsp);1207 return rc;1208}1209 1210/**1211 * fc_fcp_error() - Handler for FCP layer errors1212 * @fsp: The FCP packet the error is on1213 * @fp: The frame that has errored1214 */1215static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)1216{1217 int error = PTR_ERR(fp);1218 1219 if (fc_fcp_lock_pkt(fsp))1220 return;1221 1222 if (error == -FC_EX_CLOSED) {1223 fc_fcp_retry_cmd(fsp, FC_ERROR);1224 goto unlock;1225 }1226 1227 /*1228 * clear abort pending, because the lower layer1229 * decided to force completion.1230 */1231 fsp->state &= ~FC_SRB_ABORT_PENDING;1232 fsp->status_code = FC_CMD_PLOGO;1233 fc_fcp_complete_locked(fsp);1234unlock:1235 fc_fcp_unlock_pkt(fsp);1236}1237 1238/**1239 * fc_fcp_pkt_abort() - Abort a fcp_pkt1240 * @fsp: The FCP packet to abort on1241 *1242 * Called to send an abort and then wait for abort completion1243 */1244static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)1245{1246 int rc = FAILED;1247 unsigned long ticks_left;1248 1249 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state);1250 if (fc_fcp_send_abort(fsp)) {1251 FC_FCP_DBG(fsp, "failed to send abort\n");1252 return FAILED;1253 }1254 1255 if (fsp->state & FC_SRB_ABORTED) {1256 FC_FCP_DBG(fsp, "target abort cmd completed\n");1257 return SUCCESS;1258 }1259 1260 init_completion(&fsp->tm_done);1261 fsp->wait_for_comp = 1;1262 1263 spin_unlock_bh(&fsp->scsi_pkt_lock);1264 ticks_left = wait_for_completion_timeout(&fsp->tm_done,1265 FC_SCSI_TM_TOV);1266 spin_lock_bh(&fsp->scsi_pkt_lock);1267 fsp->wait_for_comp = 0;1268 1269 if (!ticks_left) {1270 FC_FCP_DBG(fsp, "target abort cmd failed\n");1271 } else if (fsp->state & FC_SRB_ABORTED) {1272 FC_FCP_DBG(fsp, "target abort cmd passed\n");1273 rc = SUCCESS;1274 fc_fcp_complete_locked(fsp);1275 }1276 1277 return rc;1278}1279 1280/**1281 * fc_lun_reset_send() - Send LUN reset command1282 * @t: Timer context used to fetch the FSP packet1283 */1284static void fc_lun_reset_send(struct timer_list *t)1285{1286 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);1287 struct fc_lport *lport = fsp->lp;1288 1289 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {1290 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)1291 return;1292 if (fc_fcp_lock_pkt(fsp))1293 return;1294 fsp->timer.function = fc_lun_reset_send;1295 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));1296 fc_fcp_unlock_pkt(fsp);1297 }1298}1299 1300/**1301 * fc_lun_reset() - Send a LUN RESET command to a device1302 * and wait for the reply1303 * @lport: The local port to sent the command on1304 * @fsp: The FCP packet that identifies the LUN to be reset1305 * @id: The SCSI command ID1306 * @lun: The LUN ID to be reset1307 */1308static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,1309 unsigned int id, unsigned int lun)1310{1311 int rc;1312 1313 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);1314 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;1315 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);1316 1317 fsp->wait_for_comp = 1;1318 init_completion(&fsp->tm_done);1319 1320 fc_lun_reset_send(&fsp->timer);1321 1322 /*1323 * wait for completion of reset1324 * after that make sure all commands are terminated1325 */1326 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);1327 1328 spin_lock_bh(&fsp->scsi_pkt_lock);1329 fsp->state |= FC_SRB_COMPL;1330 spin_unlock_bh(&fsp->scsi_pkt_lock);1331 1332 del_timer_sync(&fsp->timer);1333 1334 spin_lock_bh(&fsp->scsi_pkt_lock);1335 if (fsp->seq_ptr) {1336 fc_exch_done(fsp->seq_ptr);1337 fsp->seq_ptr = NULL;1338 }1339 fsp->wait_for_comp = 0;1340 spin_unlock_bh(&fsp->scsi_pkt_lock);1341 1342 if (!rc) {1343 FC_SCSI_DBG(lport, "lun reset failed\n");1344 return FAILED;1345 }1346 1347 /* cdb_status holds the tmf's rsp code */1348 if (fsp->cdb_status != FCP_TMF_CMPL)1349 return FAILED;1350 1351 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);1352 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);1353 return SUCCESS;1354}1355 1356/**1357 * fc_tm_done() - Task Management response handler1358 * @seq: The sequence that the response is on1359 * @fp: The response frame1360 * @arg: The FCP packet the response is for1361 */1362static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)1363{1364 struct fc_fcp_pkt *fsp = arg;1365 struct fc_frame_header *fh;1366 1367 if (IS_ERR(fp)) {1368 /*1369 * If there is an error just let it timeout or wait1370 * for TMF to be aborted if it timedout.1371 *1372 * scsi-eh will escalate for when either happens.1373 */1374 return;1375 }1376 1377 if (fc_fcp_lock_pkt(fsp))1378 goto out;1379 1380 /*1381 * raced with eh timeout handler.1382 */1383 if (!fsp->seq_ptr || !fsp->wait_for_comp)1384 goto out_unlock;1385 1386 fh = fc_frame_header_get(fp);1387 if (fh->fh_type != FC_TYPE_BLS)1388 fc_fcp_resp(fsp, fp);1389 fsp->seq_ptr = NULL;1390 fc_exch_done(seq);1391out_unlock:1392 fc_fcp_unlock_pkt(fsp);1393out:1394 fc_frame_free(fp);1395}1396 1397/**1398 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port1399 * @lport: The local port to be cleaned up1400 */1401static void fc_fcp_cleanup(struct fc_lport *lport)1402{1403 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);1404}1405 1406/**1407 * fc_fcp_timeout() - Handler for fcp_pkt timeouts1408 * @t: Timer context used to fetch the FSP packet1409 *1410 * If REC is supported then just issue it and return. The REC exchange will1411 * complete or time out and recovery can continue at that point. Otherwise,1412 * if the response has been received without all the data it has been1413 * ER_TIMEOUT since the response was received. If the response has not been1414 * received we see if data was received recently. If it has been then we1415 * continue waiting, otherwise, we abort the command.1416 */1417static void fc_fcp_timeout(struct timer_list *t)1418{1419 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);1420 struct fc_rport *rport = fsp->rport;1421 struct fc_rport_libfc_priv *rpriv = rport->dd_data;1422 1423 if (fc_fcp_lock_pkt(fsp))1424 return;1425 1426 if (fsp->cdb_cmd.fc_tm_flags)1427 goto unlock;1428 1429 if (fsp->lp->qfull) {1430 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n",1431 fsp->timer_delay);1432 fsp->timer.function = fc_fcp_timeout;1433 fc_fcp_timer_set(fsp, fsp->timer_delay);1434 goto unlock;1435 }1436 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n",1437 fsp->timer_delay, rpriv->flags, fsp->state);1438 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;1439 1440 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)1441 fc_fcp_rec(fsp);1442 else if (fsp->state & FC_SRB_RCV_STATUS)1443 fc_fcp_complete_locked(fsp);1444 else1445 fc_fcp_recovery(fsp, FC_TIMED_OUT);1446 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;1447unlock:1448 fc_fcp_unlock_pkt(fsp);1449}1450 1451/**1452 * fc_fcp_rec() - Send a REC ELS request1453 * @fsp: The FCP packet to send the REC request on1454 */1455static void fc_fcp_rec(struct fc_fcp_pkt *fsp)1456{1457 struct fc_lport *lport;1458 struct fc_frame *fp;1459 struct fc_rport *rport;1460 struct fc_rport_libfc_priv *rpriv;1461 1462 lport = fsp->lp;1463 rport = fsp->rport;1464 rpriv = rport->dd_data;1465 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {1466 fsp->status_code = FC_HRD_ERROR;1467 fsp->io_status = 0;1468 fc_fcp_complete_locked(fsp);1469 return;1470 }1471 1472 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));1473 if (!fp)1474 goto retry;1475 1476 fr_seq(fp) = fsp->seq_ptr;1477 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,1478 rpriv->local_port->port_id, FC_TYPE_ELS,1479 FC_FCTL_REQ, 0);1480 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,1481 fc_fcp_rec_resp, fsp,1482 2 * lport->r_a_tov)) {1483 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */1484 return;1485 }1486retry:1487 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)1488 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));1489 else1490 fc_fcp_recovery(fsp, FC_TIMED_OUT);1491}1492 1493/**1494 * fc_fcp_rec_resp() - Handler for REC ELS responses1495 * @seq: The sequence the response is on1496 * @fp: The response frame1497 * @arg: The FCP packet the response is on1498 *1499 * If the response is a reject then the scsi layer will handle1500 * the timeout. If the response is a LS_ACC then if the I/O was not completed1501 * set the timeout and return. If the I/O was completed then complete the1502 * exchange and tell the SCSI layer.1503 */1504static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)1505{1506 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;1507 struct fc_els_rec_acc *recp;1508 struct fc_els_ls_rjt *rjt;1509 u32 e_stat;1510 u8 opcode;1511 u32 offset;1512 enum dma_data_direction data_dir;1513 enum fc_rctl r_ctl;1514 struct fc_rport_libfc_priv *rpriv;1515 1516 if (IS_ERR(fp)) {1517 fc_fcp_rec_error(fsp, fp);1518 return;1519 }1520 1521 if (fc_fcp_lock_pkt(fsp))1522 goto out;1523 1524 fsp->recov_retry = 0;1525 opcode = fc_frame_payload_op(fp);1526 if (opcode == ELS_LS_RJT) {1527 rjt = fc_frame_payload_get(fp, sizeof(*rjt));1528 switch (rjt->er_reason) {1529 default:1530 FC_FCP_DBG(fsp,1531 "device %x invalid REC reject %d/%d\n",1532 fsp->rport->port_id, rjt->er_reason,1533 rjt->er_explan);1534 fallthrough;1535 case ELS_RJT_UNSUP:1536 FC_FCP_DBG(fsp, "device does not support REC\n");1537 rpriv = fsp->rport->dd_data;1538 /*1539 * if we do not spport RECs or got some bogus1540 * reason then resetup timer so we check for1541 * making progress.1542 */1543 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;1544 break;1545 case ELS_RJT_LOGIC:1546 case ELS_RJT_UNAB:1547 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n",1548 fsp->rport->port_id, rjt->er_reason,1549 rjt->er_explan);1550 /*1551 * If response got lost or is stuck in the1552 * queue somewhere we have no idea if and when1553 * the response will be received. So quarantine1554 * the xid and retry the command.1555 */1556 if (rjt->er_explan == ELS_EXPL_OXID_RXID) {1557 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);1558 ep->state |= FC_EX_QUARANTINE;1559 fsp->state |= FC_SRB_ABORTED;1560 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);1561 break;1562 }1563 fc_fcp_recovery(fsp, FC_TRANS_RESET);1564 break;1565 }1566 } else if (opcode == ELS_LS_ACC) {1567 if (fsp->state & FC_SRB_ABORTED)1568 goto unlock_out;1569 1570 data_dir = fsp->cmd->sc_data_direction;1571 recp = fc_frame_payload_get(fp, sizeof(*recp));1572 offset = ntohl(recp->reca_fc4value);1573 e_stat = ntohl(recp->reca_e_stat);1574 1575 if (e_stat & ESB_ST_COMPLETE) {1576 1577 /*1578 * The exchange is complete.1579 *1580 * For output, we must've lost the response.1581 * For input, all data must've been sent.1582 * We lost may have lost the response1583 * (and a confirmation was requested) and maybe1584 * some data.1585 *1586 * If all data received, send SRR1587 * asking for response. If partial data received,1588 * or gaps, SRR requests data at start of gap.1589 * Recovery via SRR relies on in-order-delivery.1590 */1591 if (data_dir == DMA_TO_DEVICE) {1592 r_ctl = FC_RCTL_DD_CMD_STATUS;1593 } else if (fsp->xfer_contig_end == offset) {1594 r_ctl = FC_RCTL_DD_CMD_STATUS;1595 } else {1596 offset = fsp->xfer_contig_end;1597 r_ctl = FC_RCTL_DD_SOL_DATA;1598 }1599 fc_fcp_srr(fsp, r_ctl, offset);1600 } else if (e_stat & ESB_ST_SEQ_INIT) {1601 /*1602 * The remote port has the initiative, so just1603 * keep waiting for it to complete.1604 */1605 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));1606 } else {1607 1608 /*1609 * The exchange is incomplete, we have seq. initiative.1610 * Lost response with requested confirmation,1611 * lost confirmation, lost transfer ready or1612 * lost write data.1613 *1614 * For output, if not all data was received, ask1615 * for transfer ready to be repeated.1616 *1617 * If we received or sent all the data, send SRR to1618 * request response.1619 *1620 * If we lost a response, we may have lost some read1621 * data as well.1622 */1623 r_ctl = FC_RCTL_DD_SOL_DATA;1624 if (data_dir == DMA_TO_DEVICE) {1625 r_ctl = FC_RCTL_DD_CMD_STATUS;1626 if (offset < fsp->data_len)1627 r_ctl = FC_RCTL_DD_DATA_DESC;1628 } else if (offset == fsp->xfer_contig_end) {1629 r_ctl = FC_RCTL_DD_CMD_STATUS;1630 } else if (fsp->xfer_contig_end < offset) {1631 offset = fsp->xfer_contig_end;1632 }1633 fc_fcp_srr(fsp, r_ctl, offset);1634 }1635 }1636unlock_out:1637 fc_fcp_unlock_pkt(fsp);1638out:1639 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */1640 fc_frame_free(fp);1641}1642 1643/**1644 * fc_fcp_rec_error() - Handler for REC errors1645 * @fsp: The FCP packet the error is on1646 * @fp: The REC frame1647 */1648static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)1649{1650 int error = PTR_ERR(fp);1651 1652 if (fc_fcp_lock_pkt(fsp))1653 goto out;1654 1655 switch (error) {1656 case -FC_EX_CLOSED:1657 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n",1658 fsp, fsp->rport->port_id);1659 fc_fcp_retry_cmd(fsp, FC_ERROR);1660 break;1661 1662 default:1663 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",1664 fsp, fsp->rport->port_id, error);1665 fsp->status_code = FC_CMD_PLOGO;1666 fallthrough;1667 1668 case -FC_EX_TIMEOUT:1669 /*1670 * Assume REC or LS_ACC was lost.1671 * The exchange manager will have aborted REC, so retry.1672 */1673 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n",1674 fsp, fsp->rport->port_id, fsp->recov_retry,1675 FC_MAX_RECOV_RETRY);1676 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)1677 fc_fcp_rec(fsp);1678 else1679 fc_fcp_recovery(fsp, FC_TIMED_OUT);1680 break;1681 }1682 fc_fcp_unlock_pkt(fsp);1683out:1684 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */1685}1686 1687/**1688 * fc_fcp_recovery() - Handler for fcp_pkt recovery1689 * @fsp: The FCP pkt that needs to be aborted1690 * @code: The FCP status code to set1691 */1692static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)1693{1694 FC_FCP_DBG(fsp, "start recovery code %x\n", code);1695 fsp->status_code = code;1696 fsp->cdb_status = 0;1697 fsp->io_status = 0;1698 if (!fsp->cmd)1699 /*1700 * Only abort non-scsi commands; otherwise let the1701 * scsi command timer fire and scsi-ml escalate.1702 */1703 fc_fcp_send_abort(fsp);1704}1705 1706/**1707 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)1708 * @fsp: The FCP packet the SRR is to be sent on1709 * @r_ctl: The R_CTL field for the SRR request1710 * @offset: The SRR relative offset1711 * This is called after receiving status but insufficient data, or1712 * when expecting status but the request has timed out.1713 */1714static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)1715{1716 struct fc_lport *lport = fsp->lp;1717 struct fc_rport *rport;1718 struct fc_rport_libfc_priv *rpriv;1719 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);1720 struct fc_seq *seq;1721 struct fcp_srr *srr;1722 struct fc_frame *fp;1723 1724 rport = fsp->rport;1725 rpriv = rport->dd_data;1726 1727 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||1728 rpriv->rp_state != RPORT_ST_READY)1729 goto retry; /* shouldn't happen */1730 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));1731 if (!fp)1732 goto retry;1733 1734 srr = fc_frame_payload_get(fp, sizeof(*srr));1735 memset(srr, 0, sizeof(*srr));1736 srr->srr_op = ELS_SRR;1737 srr->srr_ox_id = htons(ep->oxid);1738 srr->srr_rx_id = htons(ep->rxid);1739 srr->srr_r_ctl = r_ctl;1740 srr->srr_rel_off = htonl(offset);1741 1742 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,1743 rpriv->local_port->port_id, FC_TYPE_FCP,1744 FC_FCTL_REQ, 0);1745 1746 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp,1747 fc_fcp_pkt_destroy,1748 fsp, get_fsp_rec_tov(fsp));1749 if (!seq)1750 goto retry;1751 1752 fsp->recov_seq = seq;1753 fsp->xfer_len = offset;1754 fsp->xfer_contig_end = offset;1755 fsp->state &= ~FC_SRB_RCV_STATUS;1756 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */1757 return;1758retry:1759 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);1760}1761 1762/**1763 * fc_fcp_srr_resp() - Handler for SRR response1764 * @seq: The sequence the SRR is on1765 * @fp: The SRR frame1766 * @arg: The FCP packet the SRR is on1767 */1768static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)1769{1770 struct fc_fcp_pkt *fsp = arg;1771 struct fc_frame_header *fh;1772 1773 if (IS_ERR(fp)) {1774 fc_fcp_srr_error(fsp, fp);1775 return;1776 }1777 1778 if (fc_fcp_lock_pkt(fsp))1779 goto out;1780 1781 fh = fc_frame_header_get(fp);1782 /*1783 * BUG? fc_fcp_srr_error calls fc_exch_done which would release1784 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,1785 * then fc_exch_timeout would be sending an abort. The fc_exch_done1786 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing1787 * an abort response though.1788 */1789 if (fh->fh_type == FC_TYPE_BLS) {1790 fc_fcp_unlock_pkt(fsp);1791 return;1792 }1793 1794 switch (fc_frame_payload_op(fp)) {1795 case ELS_LS_ACC:1796 fsp->recov_retry = 0;1797 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));1798 break;1799 case ELS_LS_RJT:1800 default:1801 fc_fcp_recovery(fsp, FC_ERROR);1802 break;1803 }1804 fc_fcp_unlock_pkt(fsp);1805out:1806 fc_exch_done(seq);1807 fc_frame_free(fp);1808}1809 1810/**1811 * fc_fcp_srr_error() - Handler for SRR errors1812 * @fsp: The FCP packet that the SRR error is on1813 * @fp: The SRR frame1814 */1815static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)1816{1817 if (fc_fcp_lock_pkt(fsp))1818 goto out;1819 switch (PTR_ERR(fp)) {1820 case -FC_EX_TIMEOUT:1821 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry);1822 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)1823 fc_fcp_rec(fsp);1824 else1825 fc_fcp_recovery(fsp, FC_TIMED_OUT);1826 break;1827 case -FC_EX_CLOSED: /* e.g., link failure */1828 FC_FCP_DBG(fsp, "SRR error, exchange closed\n");1829 fallthrough;1830 default:1831 fc_fcp_retry_cmd(fsp, FC_ERROR);1832 break;1833 }1834 fc_fcp_unlock_pkt(fsp);1835out:1836 fc_exch_done(fsp->recov_seq);1837}1838 1839/**1840 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready1841 * @lport: The local port to be checked1842 */1843static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)1844{1845 /* lock ? */1846 return (lport->state == LPORT_ST_READY) &&1847 lport->link_up && !lport->qfull;1848}1849 1850/**1851 * fc_queuecommand() - The queuecommand function of the SCSI template1852 * @shost: The Scsi_Host that the command was issued to1853 * @sc_cmd: The scsi_cmnd to be executed1854 *1855 * This is the i/o strategy routine, called by the SCSI layer.1856 */1857int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)1858{1859 struct fc_lport *lport = shost_priv(shost);1860 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));1861 struct fc_fcp_pkt *fsp;1862 int rval;1863 int rc = 0;1864 1865 rval = fc_remote_port_chkready(rport);1866 if (rval) {1867 sc_cmd->result = rval;1868 scsi_done(sc_cmd);1869 return 0;1870 }1871 1872 if (!*(struct fc_remote_port **)rport->dd_data) {1873 /*1874 * rport is transitioning from blocked/deleted to1875 * online1876 */1877 sc_cmd->result = DID_IMM_RETRY << 16;1878 scsi_done(sc_cmd);1879 goto out;1880 }1881 1882 if (!fc_fcp_lport_queue_ready(lport)) {1883 if (lport->qfull) {1884 if (fc_fcp_can_queue_ramp_down(lport))1885 shost_printk(KERN_ERR, lport->host,1886 "libfc: queue full, "1887 "reducing can_queue to %d.\n",1888 lport->host->can_queue);1889 }1890 rc = SCSI_MLQUEUE_HOST_BUSY;1891 goto out;1892 }1893 1894 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);1895 if (fsp == NULL) {1896 rc = SCSI_MLQUEUE_HOST_BUSY;1897 goto out;1898 }1899 1900 /*1901 * build the libfc request pkt1902 */1903 fsp->cmd = sc_cmd; /* save the cmd */1904 fsp->rport = rport; /* set the remote port ptr */1905 1906 /*1907 * set up the transfer length1908 */1909 fsp->data_len = scsi_bufflen(sc_cmd);1910 fsp->xfer_len = 0;1911 1912 /*1913 * setup the data direction1914 */1915 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {1916 fsp->req_flags = FC_SRB_READ;1917 this_cpu_inc(lport->stats->InputRequests);1918 this_cpu_add(lport->stats->InputBytes, fsp->data_len);1919 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {1920 fsp->req_flags = FC_SRB_WRITE;1921 this_cpu_inc(lport->stats->OutputRequests);1922 this_cpu_add(lport->stats->OutputBytes, fsp->data_len);1923 } else {1924 fsp->req_flags = 0;1925 this_cpu_inc(lport->stats->ControlRequests);1926 }1927 1928 /*1929 * send it to the lower layer1930 * if we get -1 return then put the request in the pending1931 * queue.1932 */1933 rval = fc_fcp_pkt_send(lport, fsp);1934 if (rval != 0) {1935 fsp->state = FC_SRB_FREE;1936 fc_fcp_pkt_release(fsp);1937 rc = SCSI_MLQUEUE_HOST_BUSY;1938 }1939out:1940 return rc;1941}1942EXPORT_SYMBOL(fc_queuecommand);1943 1944/**1945 * fc_io_compl() - Handle responses for completed commands1946 * @fsp: The FCP packet that is complete1947 *1948 * Translates fcp_pkt errors to a Linux SCSI errors.1949 * The fcp packet lock must be held when calling.1950 */1951static void fc_io_compl(struct fc_fcp_pkt *fsp)1952{1953 struct fc_fcp_internal *si;1954 struct scsi_cmnd *sc_cmd;1955 struct fc_lport *lport;1956 unsigned long flags;1957 1958 /* release outstanding ddp context */1959 fc_fcp_ddp_done(fsp);1960 1961 fsp->state |= FC_SRB_COMPL;1962 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {1963 spin_unlock_bh(&fsp->scsi_pkt_lock);1964 del_timer_sync(&fsp->timer);1965 spin_lock_bh(&fsp->scsi_pkt_lock);1966 }1967 1968 lport = fsp->lp;1969 si = fc_get_scsi_internal(lport);1970 1971 /*1972 * if can_queue ramp down is done then try can_queue ramp up1973 * since commands are completing now.1974 */1975 if (si->last_can_queue_ramp_down_time)1976 fc_fcp_can_queue_ramp_up(lport);1977 1978 sc_cmd = fsp->cmd;1979 libfc_priv(sc_cmd)->status = fsp->cdb_status;1980 switch (fsp->status_code) {1981 case FC_COMPLETE:1982 if (fsp->cdb_status == 0) {1983 /*1984 * good I/O status1985 */1986 sc_cmd->result = DID_OK << 16;1987 if (fsp->scsi_resid)1988 libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid;1989 } else {1990 /*1991 * transport level I/O was ok but scsi1992 * has non zero status1993 */1994 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;1995 }1996 break;1997 case FC_ERROR:1998 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "1999 "due to FC_ERROR\n");2000 sc_cmd->result = DID_ERROR << 16;2001 break;2002 case FC_DATA_UNDRUN:2003 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {2004 /*2005 * scsi status is good but transport level2006 * underrun.2007 */2008 if (fsp->state & FC_SRB_RCV_STATUS) {2009 sc_cmd->result = DID_OK << 16;2010 } else {2011 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"2012 " due to FC_DATA_UNDRUN (trans)\n");2013 sc_cmd->result = DID_ERROR << 16;2014 }2015 } else {2016 /*2017 * scsi got underrun, this is an error2018 */2019 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "2020 "due to FC_DATA_UNDRUN (scsi)\n");2021 libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid;2022 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;2023 }2024 break;2025 case FC_DATA_OVRRUN:2026 /*2027 * overrun is an error2028 */2029 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "2030 "due to FC_DATA_OVRRUN\n");2031 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;2032 break;2033 case FC_CMD_ABORTED:2034 if (host_byte(sc_cmd->result) == DID_TIME_OUT)2035 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml "2036 "due to FC_CMD_ABORTED\n");2037 else {2038 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "2039 "due to FC_CMD_ABORTED\n");2040 set_host_byte(sc_cmd, DID_ERROR);2041 }2042 sc_cmd->result |= fsp->io_status;2043 break;2044 case FC_CMD_RESET:2045 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "2046 "due to FC_CMD_RESET\n");2047 sc_cmd->result = (DID_RESET << 16);2048 break;2049 case FC_TRANS_RESET:2050 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml "2051 "due to FC_TRANS_RESET\n");2052 sc_cmd->result = (DID_SOFT_ERROR << 16);2053 break;2054 case FC_HRD_ERROR:2055 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "2056 "due to FC_HRD_ERROR\n");2057 sc_cmd->result = (DID_NO_CONNECT << 16);2058 break;2059 case FC_CRC_ERROR:2060 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "2061 "due to FC_CRC_ERROR\n");2062 sc_cmd->result = (DID_PARITY << 16);2063 break;2064 case FC_TIMED_OUT:2065 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml "2066 "due to FC_TIMED_OUT\n");2067 sc_cmd->result = (DID_TIME_OUT << 16);2068 break;2069 default:2070 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "2071 "due to unknown error\n");2072 sc_cmd->result = (DID_ERROR << 16);2073 break;2074 }2075 2076 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)2077 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);2078 2079 spin_lock_irqsave(&si->scsi_queue_lock, flags);2080 list_del(&fsp->list);2081 libfc_priv(sc_cmd)->fsp = NULL;2082 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);2083 scsi_done(sc_cmd);2084 2085 /* release ref from initial allocation in queue command */2086 fc_fcp_pkt_release(fsp);2087}2088 2089/**2090 * fc_eh_abort() - Abort a command2091 * @sc_cmd: The SCSI command to abort2092 *2093 * From SCSI host template.2094 * Send an ABTS to the target device and wait for the response.2095 */2096int fc_eh_abort(struct scsi_cmnd *sc_cmd)2097{2098 struct fc_fcp_pkt *fsp;2099 struct fc_lport *lport;2100 struct fc_fcp_internal *si;2101 int rc = FAILED;2102 unsigned long flags;2103 int rval;2104 2105 rval = fc_block_scsi_eh(sc_cmd);2106 if (rval)2107 return rval;2108 2109 lport = shost_priv(sc_cmd->device->host);2110 if (lport->state != LPORT_ST_READY)2111 return rc;2112 else if (!lport->link_up)2113 return rc;2114 2115 si = fc_get_scsi_internal(lport);2116 spin_lock_irqsave(&si->scsi_queue_lock, flags);2117 fsp = libfc_priv(sc_cmd)->fsp;2118 if (!fsp) {2119 /* command completed while scsi eh was setting up */2120 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);2121 return SUCCESS;2122 }2123 /* grab a ref so the fsp and sc_cmd cannot be released from under us */2124 fc_fcp_pkt_hold(fsp);2125 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);2126 2127 if (fc_fcp_lock_pkt(fsp)) {2128 /* completed while we were waiting for timer to be deleted */2129 rc = SUCCESS;2130 goto release_pkt;2131 }2132 2133 rc = fc_fcp_pkt_abort(fsp);2134 fc_fcp_unlock_pkt(fsp);2135 2136release_pkt:2137 fc_fcp_pkt_release(fsp);2138 return rc;2139}2140EXPORT_SYMBOL(fc_eh_abort);2141 2142/**2143 * fc_eh_device_reset() - Reset a single LUN2144 * @sc_cmd: The SCSI command which identifies the device whose2145 * LUN is to be reset2146 *2147 * Set from SCSI host template.2148 */2149int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)2150{2151 struct fc_lport *lport;2152 struct fc_fcp_pkt *fsp;2153 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));2154 int rc = FAILED;2155 int rval;2156 2157 rval = fc_block_scsi_eh(sc_cmd);2158 if (rval)2159 return rval;2160 2161 lport = shost_priv(sc_cmd->device->host);2162 2163 if (lport->state != LPORT_ST_READY)2164 return rc;2165 2166 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);2167 2168 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);2169 if (fsp == NULL) {2170 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");2171 goto out;2172 }2173 2174 /*2175 * Build the libfc request pkt. Do not set the scsi cmnd, because2176 * the sc passed in is not setup for execution like when sent2177 * through the queuecommand callout.2178 */2179 fsp->rport = rport; /* set the remote port ptr */2180 2181 /*2182 * flush outstanding commands2183 */2184 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);2185 fsp->state = FC_SRB_FREE;2186 fc_fcp_pkt_release(fsp);2187 2188out:2189 return rc;2190}2191EXPORT_SYMBOL(fc_eh_device_reset);2192 2193/**2194 * fc_eh_host_reset() - Reset a Scsi_Host.2195 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset2196 */2197int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)2198{2199 struct Scsi_Host *shost = sc_cmd->device->host;2200 struct fc_lport *lport = shost_priv(shost);2201 unsigned long wait_tmo;2202 2203 FC_SCSI_DBG(lport, "Resetting host\n");2204 2205 fc_lport_reset(lport);2206 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;2207 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,2208 wait_tmo))2209 msleep(1000);2210 2211 if (fc_fcp_lport_queue_ready(lport)) {2212 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "2213 "on port (%6.6x)\n", lport->port_id);2214 return SUCCESS;2215 } else {2216 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "2217 "port (%6.6x) is not ready.\n",2218 lport->port_id);2219 return FAILED;2220 }2221}2222EXPORT_SYMBOL(fc_eh_host_reset);2223 2224/**2225 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host2226 * @sdev: The SCSI device that identifies the SCSI host2227 *2228 * Configures queue depth based on host's cmd_per_len. If not set2229 * then we use the libfc default.2230 */2231int fc_slave_alloc(struct scsi_device *sdev)2232{2233 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));2234 2235 if (!rport || fc_remote_port_chkready(rport))2236 return -ENXIO;2237 2238 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH);2239 return 0;2240}2241EXPORT_SYMBOL(fc_slave_alloc);2242 2243/**2244 * fc_fcp_destroy() - Tear down the FCP layer for a given local port2245 * @lport: The local port that no longer needs the FCP layer2246 */2247void fc_fcp_destroy(struct fc_lport *lport)2248{2249 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);2250 2251 if (!list_empty(&si->scsi_pkt_queue))2252 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "2253 "port (%6.6x)\n", lport->port_id);2254 2255 mempool_destroy(si->scsi_pkt_pool);2256 kfree(si);2257 lport->scsi_priv = NULL;2258}2259EXPORT_SYMBOL(fc_fcp_destroy);2260 2261int fc_setup_fcp(void)2262{2263 int rc = 0;2264 2265 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",2266 sizeof(struct fc_fcp_pkt),2267 0, SLAB_HWCACHE_ALIGN, NULL);2268 if (!scsi_pkt_cachep) {2269 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "2270 "module load failed!");2271 rc = -ENOMEM;2272 }2273 2274 return rc;2275}2276 2277void fc_destroy_fcp(void)2278{2279 kmem_cache_destroy(scsi_pkt_cachep);2280}2281 2282/**2283 * fc_fcp_init() - Initialize the FCP layer for a local port2284 * @lport: The local port to initialize the exchange layer for2285 */2286int fc_fcp_init(struct fc_lport *lport)2287{2288 int rc;2289 struct fc_fcp_internal *si;2290 2291 if (!lport->tt.fcp_cmd_send)2292 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;2293 2294 if (!lport->tt.fcp_cleanup)2295 lport->tt.fcp_cleanup = fc_fcp_cleanup;2296 2297 if (!lport->tt.fcp_abort_io)2298 lport->tt.fcp_abort_io = fc_fcp_abort_io;2299 2300 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);2301 if (!si)2302 return -ENOMEM;2303 lport->scsi_priv = si;2304 si->max_can_queue = lport->host->can_queue;2305 INIT_LIST_HEAD(&si->scsi_pkt_queue);2306 spin_lock_init(&si->scsi_queue_lock);2307 2308 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);2309 if (!si->scsi_pkt_pool) {2310 rc = -ENOMEM;2311 goto free_internal;2312 }2313 return 0;2314 2315free_internal:2316 kfree(si);2317 return rc;2318}2319EXPORT_SYMBOL(fc_fcp_init);2320