/* * Copyright(c) 2007 Intel Corporation. All rights reserved. * Copyright(c) 2008 Red Hat, Inc. All rights reserved. * Copyright(c) 2008 Mike Christie * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * * Maintained at www.Open-FCoE.org */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Open-FCoE.org"); MODULE_DESCRIPTION("libfc"); MODULE_LICENSE("GPL v2"); unsigned int fc_debug_logging; module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); static struct kmem_cache *scsi_pkt_cachep; /* SRB state definitions */ #define FC_SRB_FREE 0 /* cmd is free */ #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */ #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */ #define FC_SRB_READ (1 << 1) #define FC_SRB_WRITE (1 << 0) /* * The SCp.ptr should be tested and set under the host lock. NULL indicates * that the command has been retruned to the scsi layer. */ #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) struct fc_fcp_internal { mempool_t *scsi_pkt_pool; struct list_head scsi_pkt_queue; u8 throttled; }; #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) /* * function prototypes * FC scsi I/O related functions */ static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); static void fc_fcp_complete_locked(struct fc_fcp_pkt *); static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp); static void fc_timeout_error(struct fc_fcp_pkt *); static void fc_fcp_timeout(unsigned long data); static void fc_fcp_rec(struct fc_fcp_pkt *); static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); static void fc_io_compl(struct fc_fcp_pkt *); static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); /* * command status codes */ #define FC_COMPLETE 0 #define FC_CMD_ABORTED 1 #define FC_CMD_RESET 2 #define FC_CMD_PLOGO 3 #define FC_SNS_RCV 4 #define FC_TRANS_ERR 5 #define FC_DATA_OVRRUN 6 #define FC_DATA_UNDRUN 7 #define FC_ERROR 8 #define FC_HRD_ERROR 9 #define FC_CMD_TIME_OUT 10 /* * Error recovery timeout values. */ #define FC_SCSI_ER_TIMEOUT (10 * HZ) #define FC_SCSI_TM_TOV (10 * HZ) #define FC_SCSI_REC_TOV (2 * HZ) #define FC_HOST_RESET_TIMEOUT (30 * HZ) #define FC_MAX_ERROR_CNT 5 #define FC_MAX_RECOV_RETRY 3 #define FC_FCP_DFLT_QUEUE_DEPTH 32 /** * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet * @lp: fc lport struct * @gfp: gfp flags for allocation * * This is used by upper layer scsi driver. * Return Value : scsi_pkt structure or null on allocation failure. * Context : call from process context. no locking required. */ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp) { struct fc_fcp_internal *si = fc_get_scsi_internal(lp); struct fc_fcp_pkt *fsp; fsp = mempool_alloc(si->scsi_pkt_pool, gfp); if (fsp) { memset(fsp, 0, sizeof(*fsp)); fsp->lp = lp; atomic_set(&fsp->ref_cnt, 1); init_timer(&fsp->timer); INIT_LIST_HEAD(&fsp->list); spin_lock_init(&fsp->scsi_pkt_lock); } return fsp; } /** * fc_fcp_pkt_release() - release hold on scsi_pkt packet * @fsp: fcp packet struct * * This is used by upper layer scsi driver. * Context : call from process and interrupt context. * no locking required */ static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) { if (atomic_dec_and_test(&fsp->ref_cnt)) { struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); mempool_free(fsp, si->scsi_pkt_pool); } } static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) { atomic_inc(&fsp->ref_cnt); } /** * fc_fcp_pkt_destory() - release hold on scsi_pkt packet * @seq: exchange sequence * @fsp: fcp packet struct * * Release hold on scsi_pkt packet set to keep scsi_pkt * till EM layer exch resource is not freed. * Context : called from from EM layer. * no locking required */ static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) { fc_fcp_pkt_release(fsp); } /** * fc_fcp_lock_pkt() - lock a packet and get a ref to it. * @fsp: fcp packet * * We should only return error if we return a command to scsi-ml before * getting a response. This can happen in cases where we send a abort, but * do not wait for the response and the abort and command can be passing * each other on the wire/network-layer. * * Note: this function locks the packet and gets a reference to allow * callers to call the completion function while the lock is held and * not have to worry about the packets refcount. * * TODO: Maybe we should just have callers grab/release the lock and * have a function that they call to verify the fsp and grab a ref if * needed. */ static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) { spin_lock_bh(&fsp->scsi_pkt_lock); if (fsp->state & FC_SRB_COMPL) { spin_unlock_bh(&fsp->scsi_pkt_lock); return -EPERM; } fc_fcp_pkt_hold(fsp); return 0; } static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) { spin_unlock_bh(&fsp->scsi_pkt_lock); fc_fcp_pkt_release(fsp); } static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) { if (!(fsp->state & FC_SRB_COMPL)) mod_timer(&fsp->timer, jiffies + delay); } static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) { if (!fsp->seq_ptr) return -EINVAL; fsp->state |= FC_SRB_ABORT_PENDING; return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); } /* * Retry command. * An abort isn't needed. */ static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) { if (fsp->seq_ptr) { fsp->lp->tt.exch_done(fsp->seq_ptr); fsp->seq_ptr = NULL; } fsp->state &= ~FC_SRB_ABORT_PENDING; fsp->io_status = 0; fsp->status_code = FC_ERROR; fc_fcp_complete_locked(fsp); } /* * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP * transfer for a read I/O indicated by the fc_fcp_pkt. * @fsp: ptr to the fc_fcp_pkt * * This is called in exch_seq_send() when we have a newly allocated * exchange with a valid exchange id to setup ddp. * * returns: none */ void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) { struct fc_lport *lp; if (!fsp) return; lp = fsp->lp; if ((fsp->req_flags & FC_SRB_READ) && (lp->lro_enabled) && (lp->tt.ddp_setup)) { if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd), scsi_sg_count(fsp->cmd))) fsp->xfer_ddp = xid; } } /* * fc_fcp_ddp_done - calls to LLD's ddp_done to release any * DDP related resources for this I/O if it is initialized * as a ddp transfer * @fsp: ptr to the fc_fcp_pkt * * returns: none */ static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) { struct fc_lport *lp; if (!fsp) return; if (fsp->xfer_ddp == FC_XID_UNKNOWN) return; lp = fsp->lp; if (lp->tt.ddp_done) { fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp); fsp->xfer_ddp = FC_XID_UNKNOWN; } } /* * Receive SCSI data from target. * Called after receiving solicited data. */ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { struct scsi_cmnd *sc = fsp->cmd; struct fc_lport *lp = fsp->lp; struct fcoe_dev_stats *stats; struct fc_frame_header *fh; size_t start_offset; size_t offset; u32 crc; u32 copy_len = 0; size_t len; void *buf; struct scatterlist *sg; size_t remaining; fh = fc_frame_header_get(fp); offset = ntohl(fh->fh_parm_offset); start_offset = offset; len = fr_len(fp) - sizeof(*fh); buf = fc_frame_payload_get(fp, 0); /* if this I/O is ddped, update xfer len */ fc_fcp_ddp_done(fsp); if (offset + len > fsp->data_len) { /* this should never happen */ if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && fc_frame_crc_check(fp)) goto crc_err; FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " "data_len %x\n", len, offset, fsp->data_len); fc_fcp_retry_cmd(fsp); return; } if (offset != fsp->xfer_len) fsp->state |= FC_SRB_DISCONTIG; crc = 0; if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) crc = crc32(~0, (u8 *) fh, sizeof(*fh)); sg = scsi_sglist(sc); remaining = len; while (remaining > 0 && sg) { size_t off; void *page_addr; size_t sg_bytes; if (offset >= sg->length) { offset -= sg->length; sg = sg_next(sg); continue; } sg_bytes = min(remaining, sg->length - offset); /* * The scatterlist item may be bigger than PAGE_SIZE, * but we are limited to mapping PAGE_SIZE at a time. */ off = offset + sg->offset; sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT), KM_SOFTIRQ0); if (!page_addr) break; /* XXX panic? */ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) crc = crc32(crc, buf, sg_bytes); memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes); kunmap_atomic(page_addr, KM_SOFTIRQ0); buf += sg_bytes; offset += sg_bytes; remaining -= sg_bytes; copy_len += sg_bytes; } if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { buf = fc_frame_payload_get(fp, 0); if (len % 4) { crc = crc32(crc, buf + len, 4 - (len % 4)); len += 4 - (len % 4); } if (~crc != le32_to_cpu(fr_crc(fp))) { crc_err: stats = fc_lport_get_stats(lp); stats->ErrorFrames++; /* FIXME - per cpu count, not total count! */ if (stats->InvalidCRCCount++ < 5) printk(KERN_WARNING "libfc: CRC error on data " "frame for port (%6x)\n", fc_host_port_id(lp->host)); /* * Assume the frame is total garbage. * We may have copied it over the good part * of the buffer. * If so, we need to retry the entire operation. * Otherwise, ignore it. */ if (fsp->state & FC_SRB_DISCONTIG) fc_fcp_retry_cmd(fsp); return; } } if (fsp->xfer_contig_end == start_offset) fsp->xfer_contig_end += copy_len; fsp->xfer_len += copy_len; /* * In the very rare event that this data arrived after the response * and completes the transfer, call the completion handler. */ if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && fsp->xfer_len == fsp->data_len - fsp->scsi_resid) fc_fcp_complete_locked(fsp); } /** * fc_fcp_send_data() - Send SCSI data to target. * @fsp: ptr to fc_fcp_pkt * @sp: ptr to this sequence * @offset: starting offset for this data request * @seq_blen: the burst length for this data request * * Called after receiving a Transfer Ready data descriptor. * if LLD is capable of seq offload then send down seq_blen * size of data in single frame, otherwise send multiple FC * frames of max FC frame payload supported by target port. * * Returns : 0 for success. */ static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, size_t offset, size_t seq_blen) { struct fc_exch *ep; struct scsi_cmnd *sc; struct scatterlist *sg; struct fc_frame *fp = NULL; struct fc_lport *lp = fsp->lp; size_t remaining; size_t t_blen; size_t tlen; size_t sg_bytes; size_t frame_offset, fh_parm_offset; int error; void *data = NULL; void *page_addr; int using_sg = lp->sg_supp; u32 f_ctl; WARN_ON(seq_blen <= 0); if (unlikely(offset + seq_blen > fsp->data_len)) { /* this should never happen */ FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " "offset %zx\n", seq_blen, offset); fc_fcp_send_abort(fsp); return 0; } else if (offset != fsp->xfer_len) { /* Out of Order Data Request - no problem, but unexpected. */ FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " "seq_blen %zx offset %zx\n", seq_blen, offset); } /* * if LLD is capable of seq_offload then set transport * burst length (t_blen) to seq_blen, otherwise set t_blen * to max FC frame payload previously set in fsp->max_payload. */ t_blen = fsp->max_payload; if (lp->seq_offload) { t_blen = min(seq_blen, (size_t)lp->lso_max); FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", fsp, seq_blen, lp->lso_max, t_blen); } WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); if (t_blen > 512) t_blen &= ~(512 - 1); /* round down to block size */ WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ sc = fsp->cmd; remaining = seq_blen; fh_parm_offset = frame_offset = offset; tlen = 0; seq = lp->tt.seq_start_next(seq); f_ctl = FC_FC_REL_OFF; WARN_ON(!seq); sg = scsi_sglist(sc); while (remaining > 0 && sg) { if (offset >= sg->length) { offset -= sg->length; sg = sg_next(sg); continue; } if (!fp) { tlen = min(t_blen, remaining); /* * TODO. Temporary workaround. fc_seq_send() can't * handle odd lengths in non-linear skbs. * This will be the final fragment only. */ if (tlen % 4) using_sg = 0; if (using_sg) { fp = _fc_frame_alloc(lp, 0); if (!fp) return -ENOMEM; } else { fp = fc_frame_alloc(lp, tlen); if (!fp) return -ENOMEM; data = (void *)(fr_hdr(fp)) + sizeof(struct fc_frame_header); } fh_parm_offset = frame_offset; fr_max_payload(fp) = fsp->max_payload; } sg_bytes = min(tlen, sg->length - offset); if (using_sg) { get_page(sg_page(sg)); skb_fill_page_desc(fp_skb(fp), skb_shinfo(fp_skb(fp))->nr_frags, sg_page(sg), sg->offset + offset, sg_bytes); fp_skb(fp)->data_len += sg_bytes; fr_len(fp) += sg_bytes; fp_skb(fp)->truesize += PAGE_SIZE; } else { size_t off = offset + sg->offset; /* * The scatterlist item may be bigger than PAGE_SIZE, * but we must not cross pages inside the kmap. */ sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT), KM_SOFTIRQ0); memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), sg_bytes); kunmap_atomic(page_addr, KM_SOFTIRQ0); data += sg_bytes; } offset += sg_bytes; frame_offset += sg_bytes; tlen -= sg_bytes; remaining -= sg_bytes; if (tlen) continue; /* * Send sequence with transfer sequence initiative in case * this is last FCP frame of the sequence. */ if (remaining == 0) f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; ep = fc_seq_exch(seq); fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, FC_TYPE_FCP, f_ctl, fh_parm_offset); /* * send fragment using for a sequence. */ error = lp->tt.seq_send(lp, seq, fp); if (error) { WARN_ON(1); /* send error should be rare */ fc_fcp_retry_cmd(fsp); return 0; } fp = NULL; } fsp->xfer_len += seq_blen; /* premature count? */ return 0; } static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { int ba_done = 1; struct fc_ba_rjt *brp; struct fc_frame_header *fh; fh = fc_frame_header_get(fp); switch (fh->fh_r_ctl) { case FC_RCTL_BA_ACC: break; case FC_RCTL_BA_RJT: brp = fc_frame_payload_get(fp, sizeof(*brp)); if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) break; /* fall thru */ default: /* * we will let the command timeout * and scsi-ml recover in this case, * therefore cleared the ba_done flag. */ ba_done = 0; } if (ba_done) { fsp->state |= FC_SRB_ABORTED; fsp->state &= ~FC_SRB_ABORT_PENDING; if (fsp->wait_for_comp) complete(&fsp->tm_done); else fc_fcp_complete_locked(fsp); } } /** * fc_fcp_reduce_can_queue() - drop can_queue * @lp: lport to drop queueing for * * If we are getting memory allocation failures, then we may * be trying to execute too many commands. We let the running * commands complete or timeout, then try again with a reduced * can_queue. Eventually we will hit the point where we run * on all reserved structs. */ static void fc_fcp_reduce_can_queue(struct fc_lport *lp) { struct fc_fcp_internal *si = fc_get_scsi_internal(lp); unsigned long flags; int can_queue; spin_lock_irqsave(lp->host->host_lock, flags); if (si->throttled) goto done; si->throttled = 1; can_queue = lp->host->can_queue; can_queue >>= 1; if (!can_queue) can_queue = 1; lp->host->can_queue = can_queue; shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n" "Reducing can_queue to %d.\n", can_queue); done: spin_unlock_irqrestore(lp->host->host_lock, flags); } /** * fc_fcp_recv() - Reveive FCP frames * @seq: The sequence the frame is on * @fp: The FC frame * @arg: The related FCP packet * * Return : None * Context : called from Soft IRQ context * can not called holding list lock */ static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) { struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; struct fc_lport *lport = fsp->lp; struct fc_frame_header *fh; struct fcp_txrdy *dd; u8 r_ctl; int rc = 0; if (IS_ERR(fp)) goto errout; fh = fc_frame_header_get(fp); r_ctl = fh->fh_r_ctl; if (!(lport->state & LPORT_ST_READY)) goto out; if (fc_fcp_lock_pkt(fsp)) goto out; fsp->last_pkt_time = jiffies; if (fh->fh_type == FC_TYPE_BLS) { fc_fcp_abts_resp(fsp, fp); goto unlock; } if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) goto unlock; if (r_ctl == FC_RCTL_DD_DATA_DESC) { /* * received XFER RDY from the target * need to send data to the target */ WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); dd = fc_frame_payload_get(fp, sizeof(*dd)); WARN_ON(!dd); rc = fc_fcp_send_data(fsp, seq, (size_t) ntohl(dd->ft_data_ro), (size_t) ntohl(dd->ft_burst_len)); if (!rc) seq->rec_data = fsp->xfer_len; else if (rc == -ENOMEM) fsp->state |= FC_SRB_NOMEM; } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { /* * received a DATA frame * next we will copy the data to the system buffer */ WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ fc_fcp_recv_data(fsp, fp); seq->rec_data = fsp->xfer_contig_end; } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); fc_fcp_resp(fsp, fp); } else { FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); } unlock: fc_fcp_unlock_pkt(fsp); out: fc_frame_free(fp); errout: if (IS_ERR(fp)) fc_fcp_error(fsp, fp); else if (rc == -ENOMEM) fc_fcp_reduce_can_queue(lport); } static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { struct fc_frame_header *fh; struct fcp_resp *fc_rp; struct fcp_resp_ext *rp_ex; struct fcp_resp_rsp_info *fc_rp_info; u32 plen; u32 expected_len; u32 respl = 0; u32 snsl = 0; u8 flags = 0; plen = fr_len(fp); fh = (struct fc_frame_header *)fr_hdr(fp); if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) goto len_err; plen -= sizeof(*fh); fc_rp = (struct fcp_resp *)(fh + 1); fsp->cdb_status = fc_rp->fr_status; flags = fc_rp->fr_flags; fsp->scsi_comp_flags = flags; expected_len = fsp->data_len; /* if ddp, update xfer len */ fc_fcp_ddp_done(fsp); if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { rp_ex = (void *)(fc_rp + 1); if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) goto len_err; fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); if (flags & FCP_RSP_LEN_VAL) { respl = ntohl(rp_ex->fr_rsp_len); if (respl != sizeof(*fc_rp_info)) goto len_err; if (fsp->wait_for_comp) { /* Abuse cdb_status for rsp code */ fsp->cdb_status = fc_rp_info->rsp_code; complete(&fsp->tm_done); /* * tmfs will not have any scsi cmd so * exit here */ return; } else goto err; } if (flags & FCP_SNS_LEN_VAL) { snsl = ntohl(rp_ex->fr_sns_len); if (snsl > SCSI_SENSE_BUFFERSIZE) snsl = SCSI_SENSE_BUFFERSIZE; memcpy(fsp->cmd->sense_buffer, (char *)fc_rp_info + respl, snsl); } } if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) goto len_err; if (flags & FCP_RESID_UNDER) { fsp->scsi_resid = ntohl(rp_ex->fr_resid); /* * The cmnd->underflow is the minimum number of * bytes that must be transfered for this * command. Provided a sense condition is not * present, make sure the actual amount * transferred is at least the underflow value * or fail. */ if (!(flags & FCP_SNS_LEN_VAL) && (fc_rp->fr_status == 0) && (scsi_bufflen(fsp->cmd) - fsp->scsi_resid) < fsp->cmd->underflow) goto err; expected_len -= fsp->scsi_resid; } else { fsp->status_code = FC_ERROR; } } } fsp->state |= FC_SRB_RCV_STATUS; /* * Check for missing or extra data frames. */ if (unlikely(fsp->xfer_len != expected_len)) { if (fsp->xfer_len < expected_len) { /* * Some data may be queued locally, * Wait a at least one jiffy to see if it is delivered. * If this expires without data, we may do SRR. */ fc_fcp_timer_set(fsp, 2); return; } fsp->status_code = FC_DATA_OVRRUN; FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, " "len %x, data len %x\n", fsp->rport->port_id, fsp->xfer_len, expected_len, fsp->data_len); } fc_fcp_complete_locked(fsp); return; len_err: FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " "snsl %u\n", flags, fr_len(fp), respl, snsl); err: fsp->status_code = FC_ERROR; fc_fcp_complete_locked(fsp); } /** * fc_fcp_complete_locked() - complete processing of a fcp packet * @fsp: fcp packet * * This function may sleep if a timer is pending. The packet lock must be * held, and the host lock must not be held. */ static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) { struct fc_lport *lp = fsp->lp; struct fc_seq *seq; struct fc_exch *ep; u32 f_ctl; if (fsp->state & FC_SRB_ABORT_PENDING) return; if (fsp->state & FC_SRB_ABORTED) { if (!fsp->status_code) fsp->status_code = FC_CMD_ABORTED; } else { /* * Test for transport underrun, independent of response * underrun status. */ if (fsp->xfer_len < fsp->data_len && !fsp->io_status && (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { fsp->status_code = FC_DATA_UNDRUN; fsp->io_status = 0; } } seq = fsp->seq_ptr; if (seq) { fsp->seq_ptr = NULL; if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { struct fc_frame *conf_frame; struct fc_seq *csp; csp = lp->tt.seq_start_next(seq); conf_frame = fc_frame_alloc(fsp->lp, 0); if (conf_frame) { f_ctl = FC_FC_SEQ_INIT; f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; ep = fc_seq_exch(seq); fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, ep->did, ep->sid, FC_TYPE_FCP, f_ctl, 0); lp->tt.seq_send(lp, csp, conf_frame); } } lp->tt.exch_done(seq); } fc_io_compl(fsp); } static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) { struct fc_lport *lp = fsp->lp; if (fsp->seq_ptr) { lp->tt.exch_done(fsp->seq_ptr); fsp->seq_ptr = NULL; } fsp->status_code = error; } /** * fc_fcp_cleanup_each_cmd() - Cleanup active commads * @lp: logical port * @id: target id * @lun: lun * @error: fsp status code * * If lun or id is -1, they are ignored. */ static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id, unsigned int lun, int error) { struct fc_fcp_internal *si = fc_get_scsi_internal(lp); struct fc_fcp_pkt *fsp; struct scsi_cmnd *sc_cmd; unsigned long flags; spin_lock_irqsave(lp->host->host_lock, flags); restart: list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { sc_cmd = fsp->cmd; if (id != -1 && scmd_id(sc_cmd) != id) continue; if (lun != -1 && sc_cmd->device->lun != lun) continue; fc_fcp_pkt_hold(fsp); spin_unlock_irqrestore(lp->host->host_lock, flags); if (!fc_fcp_lock_pkt(fsp)) { fc_fcp_cleanup_cmd(fsp, error); fc_io_compl(fsp); fc_fcp_unlock_pkt(fsp); } fc_fcp_pkt_release(fsp); spin_lock_irqsave(lp->host->host_lock, flags); /* * while we dropped the lock multiple pkts could * have been released, so we have to start over. */ goto restart; } spin_unlock_irqrestore(lp->host->host_lock, flags); } static void fc_fcp_abort_io(struct fc_lport *lp) { fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR); } /** * fc_fcp_pkt_send() - send a fcp packet to the lower level. * @lp: fc lport * @fsp: fc packet. * * This is called by upper layer protocol. * Return : zero for success and -1 for failure * Context : called from queuecommand which can be called from process * or scsi soft irq. * Locks : called with the host lock and irqs disabled. */ static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp) { struct fc_fcp_internal *si = fc_get_scsi_internal(lp); int rc; fsp->cmd->SCp.ptr = (char *)fsp; fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; int_to_scsilun(fsp->cmd->device->lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); list_add_tail(&fsp->list, &si->scsi_pkt_queue); spin_unlock_irq(lp->host->host_lock); rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv); spin_lock_irq(lp->host->host_lock); if (rc) list_del(&fsp->list); return rc; } static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp, void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg)) { struct fc_frame *fp; struct fc_seq *seq; struct fc_rport *rport; struct fc_rport_libfc_priv *rp; const size_t len = sizeof(fsp->cdb_cmd); int rc = 0; if (fc_fcp_lock_pkt(fsp)) return 0; fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd)); if (!fp) { rc = -1; goto unlock; } memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); fr_fsp(fp) = fsp; rport = fsp->rport; fsp->max_payload = rport->maxframe_size; rp = rport->dd_data; fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0); if (!seq) { fc_frame_free(fp); rc = -1; goto unlock; } fsp->last_pkt_time = jiffies; fsp->seq_ptr = seq; fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); fc_fcp_timer_set(fsp, (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); unlock: fc_fcp_unlock_pkt(fsp); return rc; } /* * transport error handler */ static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { int error = PTR_ERR(fp); if (fc_fcp_lock_pkt(fsp)) return; if (error == -FC_EX_CLOSED) { fc_fcp_retry_cmd(fsp); goto unlock; } /* * clear abort pending, because the lower layer * decided to force completion. */ fsp->state &= ~FC_SRB_ABORT_PENDING; fsp->status_code = FC_CMD_PLOGO; fc_fcp_complete_locked(fsp); unlock: fc_fcp_unlock_pkt(fsp); } /* * Scsi abort handler- calls to send an abort * and then wait for abort completion */ static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) { int rc = FAILED; if (fc_fcp_send_abort(fsp)) return FAILED; init_completion(&fsp->tm_done); fsp->wait_for_comp = 1; spin_unlock_bh(&fsp->scsi_pkt_lock); rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); spin_lock_bh(&fsp->scsi_pkt_lock); fsp->wait_for_comp = 0; if (!rc) { FC_FCP_DBG(fsp, "target abort cmd failed\n"); rc = FAILED; } else if (fsp->state & FC_SRB_ABORTED) { FC_FCP_DBG(fsp, "target abort cmd passed\n"); rc = SUCCESS; fc_fcp_complete_locked(fsp); } return rc; } /* * Retry LUN reset after resource allocation failed. */ static void fc_lun_reset_send(unsigned long data) { struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; struct fc_lport *lp = fsp->lp; if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) { if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) return; if (fc_fcp_lock_pkt(fsp)) return; setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); fc_fcp_unlock_pkt(fsp); } } /* * Scsi device reset handler- send a LUN RESET to the device * and wait for reset reply */ static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp, unsigned int id, unsigned int lun) { int rc; fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); fsp->wait_for_comp = 1; init_completion(&fsp->tm_done); fc_lun_reset_send((unsigned long)fsp); /* * wait for completion of reset * after that make sure all commands are terminated */ rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); spin_lock_bh(&fsp->scsi_pkt_lock); fsp->state |= FC_SRB_COMPL; spin_unlock_bh(&fsp->scsi_pkt_lock); del_timer_sync(&fsp->timer); spin_lock_bh(&fsp->scsi_pkt_lock); if (fsp->seq_ptr) { lp->tt.exch_done(fsp->seq_ptr); fsp->seq_ptr = NULL; } fsp->wait_for_comp = 0; spin_unlock_bh(&fsp->scsi_pkt_lock); if (!rc) { FC_SCSI_DBG(lp, "lun reset failed\n"); return FAILED; } /* cdb_status holds the tmf's rsp code */ if (fsp->cdb_status != FCP_TMF_CMPL) return FAILED; FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun); fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED); return SUCCESS; } /* * Task Managment response handler */ static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) { struct fc_fcp_pkt *fsp = arg; struct fc_frame_header *fh; if (IS_ERR(fp)) { /* * If there is an error just let it timeout or wait * for TMF to be aborted if it timedout. * * scsi-eh will escalate for when either happens. */ return; } if (fc_fcp_lock_pkt(fsp)) return; /* * raced with eh timeout handler. */ if (!fsp->seq_ptr || !fsp->wait_for_comp) { spin_unlock_bh(&fsp->scsi_pkt_lock); return; } fh = fc_frame_header_get(fp); if (fh->fh_type != FC_TYPE_BLS) fc_fcp_resp(fsp, fp); fsp->seq_ptr = NULL; fsp->lp->tt.exch_done(seq); fc_frame_free(fp); fc_fcp_unlock_pkt(fsp); } static void fc_fcp_cleanup(struct fc_lport *lp) { fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR); } /* * fc_fcp_timeout: called by OS timer function. * * The timer has been inactivated and must be reactivated if desired * using fc_fcp_timer_set(). * * Algorithm: * * If REC is supported, just issue it, and return. The REC exchange will * complete or time out, and recovery can continue at that point. * * Otherwise, if the response has been received without all the data, * it has been ER_TIMEOUT since the response was received. * * If the response has not been received, * we see if data was received recently. If it has been, we continue waiting, * otherwise, we abort the command. */ static void fc_fcp_timeout(unsigned long data) { struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; struct fc_rport *rport = fsp->rport; struct fc_rport_libfc_priv *rp = rport->dd_data; if (fc_fcp_lock_pkt(fsp)) return; if (fsp->cdb_cmd.fc_tm_flags) goto unlock; fsp->state |= FC_SRB_FCP_PROCESSING_TMO; if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED) fc_fcp_rec(fsp); else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), jiffies)) fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); else if (fsp->state & FC_SRB_RCV_STATUS) fc_fcp_complete_locked(fsp); else fc_timeout_error(fsp); fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; unlock: fc_fcp_unlock_pkt(fsp); } /* * Send a REC ELS request */ static void fc_fcp_rec(struct fc_fcp_pkt *fsp) { struct fc_lport *lp; struct fc_frame *fp; struct fc_rport *rport; struct fc_rport_libfc_priv *rp; lp = fsp->lp; rport = fsp->rport; rp = rport->dd_data; if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) { fsp->status_code = FC_HRD_ERROR; fsp->io_status = 0; fc_fcp_complete_locked(fsp); return; } fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec)); if (!fp) goto retry; fr_seq(fp) = fsp->seq_ptr; fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, fc_host_port_id(rp->local_port->host), FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); if (lp->tt.elsct_send(lp, rport->port_id, fp, ELS_REC, fc_fcp_rec_resp, fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) { fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ return; } fc_frame_free(fp); retry: if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); else fc_timeout_error(fsp); } /* * Receive handler for REC ELS frame * if it is a reject then let the scsi layer to handle * the timeout. if it is a LS_ACC then if the io was not completed * then set the timeout and return otherwise complete the exchange * and tell the scsi layer to restart the I/O. */ static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) { struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; struct fc_els_rec_acc *recp; struct fc_els_ls_rjt *rjt; u32 e_stat; u8 opcode; u32 offset; enum dma_data_direction data_dir; enum fc_rctl r_ctl; struct fc_rport_libfc_priv *rp; if (IS_ERR(fp)) { fc_fcp_rec_error(fsp, fp); return; } if (fc_fcp_lock_pkt(fsp)) goto out; fsp->recov_retry = 0; opcode = fc_frame_payload_op(fp); if (opcode == ELS_LS_RJT) { rjt = fc_frame_payload_get(fp, sizeof(*rjt)); switch (rjt->er_reason) { default: FC_FCP_DBG(fsp, "device %x unexpected REC reject " "reason %d expl %d\n", fsp->rport->port_id, rjt->er_reason, rjt->er_explan); /* fall through */ case ELS_RJT_UNSUP: FC_FCP_DBG(fsp, "device does not support REC\n"); rp = fsp->rport->dd_data; /* * if we do not spport RECs or got some bogus * reason then resetup timer so we check for * making progress. */ rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); break; case ELS_RJT_LOGIC: case ELS_RJT_UNAB: /* * If no data transfer, the command frame got dropped * so we just retry. If data was transferred, we * lost the response but the target has no record, * so we abort and retry. */ if (rjt->er_explan == ELS_EXPL_OXID_RXID && fsp->xfer_len == 0) { fc_fcp_retry_cmd(fsp); break; } fc_timeout_error(fsp); break; } } else if (opcode == ELS_LS_ACC) { if (fsp->state & FC_SRB_ABORTED) goto unlock_out; data_dir = fsp->cmd->sc_data_direction; recp = fc_frame_payload_get(fp, sizeof(*recp)); offset = ntohl(recp->reca_fc4value); e_stat = ntohl(recp->reca_e_stat); if (e_stat & ESB_ST_COMPLETE) { /* * The exchange is complete. * * For output, we must've lost the response. * For input, all data must've been sent. * We lost may have lost the response * (and a confirmation was requested) and maybe * some data. * * If all data received, send SRR * asking for response. If partial data received, * or gaps, SRR requests data at start of gap. * Recovery via SRR relies on in-order-delivery. */ if (data_dir == DMA_TO_DEVICE) { r_ctl = FC_RCTL_DD_CMD_STATUS; } else if (fsp->xfer_contig_end == offset) { r_ctl = FC_RCTL_DD_CMD_STATUS; } else { offset = fsp->xfer_contig_end; r_ctl = FC_RCTL_DD_SOL_DATA; } fc_fcp_srr(fsp, r_ctl, offset); } else if (e_stat & ESB_ST_SEQ_INIT) { /* * The remote port has the initiative, so just * keep waiting for it to complete. */ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); } else { /* * The exchange is incomplete, we have seq. initiative. * Lost response with requested confirmation, * lost confirmation, lost transfer ready or * lost write data. * * For output, if not all data was received, ask * for transfer ready to be repeated. * * If we received or sent all the data, send SRR to * request response. * * If we lost a response, we may have lost some read * data as well. */ r_ctl = FC_RCTL_DD_SOL_DATA; if (data_dir == DMA_TO_DEVICE) { r_ctl = FC_RCTL_DD_CMD_STATUS; if (offset < fsp->data_len) r_ctl = FC_RCTL_DD_DATA_DESC; } else if (offset == fsp->xfer_contig_end) { r_ctl = FC_RCTL_DD_CMD_STATUS; } else if (fsp->xfer_contig_end < offset) { offset = fsp->xfer_contig_end; } fc_fcp_srr(fsp, r_ctl, offset); } } unlock_out: fc_fcp_unlock_pkt(fsp); out: fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ fc_frame_free(fp); } /* * Handle error response or timeout for REC exchange. */ static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { int error = PTR_ERR(fp); if (fc_fcp_lock_pkt(fsp)) goto out; switch (error) { case -FC_EX_CLOSED: fc_fcp_retry_cmd(fsp); break; default: FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n", fsp, fsp->rport->port_id, error); fsp->status_code = FC_CMD_PLOGO; /* fall through */ case -FC_EX_TIMEOUT: /* * Assume REC or LS_ACC was lost. * The exchange manager will have aborted REC, so retry. */ FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n", fsp->rport->port_id, error, fsp->recov_retry, FC_MAX_RECOV_RETRY); if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) fc_fcp_rec(fsp); else fc_timeout_error(fsp); break; } fc_fcp_unlock_pkt(fsp); out: fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ } /* * Time out error routine: * abort's the I/O close the exchange and * send completion notification to scsi layer */ static void fc_timeout_error(struct fc_fcp_pkt *fsp) { fsp->status_code = FC_CMD_TIME_OUT; fsp->cdb_status = 0; fsp->io_status = 0; /* * if this fails then we let the scsi command timer fire and * scsi-ml escalate. */ fc_fcp_send_abort(fsp); } /* * Sequence retransmission request. * This is called after receiving status but insufficient data, or * when expecting status but the request has timed out. */ static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) { struct fc_lport *lp = fsp->lp; struct fc_rport *rport; struct fc_rport_libfc_priv *rp; struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); struct fc_seq *seq; struct fcp_srr *srr; struct fc_frame *fp; u8 cdb_op; rport = fsp->rport; rp = rport->dd_data; cdb_op = fsp->cdb_cmd.fc_cdb[0]; if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY) goto retry; /* shouldn't happen */ fp = fc_frame_alloc(lp, sizeof(*srr)); if (!fp) goto retry; srr = fc_frame_payload_get(fp, sizeof(*srr)); memset(srr, 0, sizeof(*srr)); srr->srr_op = ELS_SRR; srr->srr_ox_id = htons(ep->oxid); srr->srr_rx_id = htons(ep->rxid); srr->srr_r_ctl = r_ctl; srr->srr_rel_off = htonl(offset); fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL, fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); if (!seq) { fc_frame_free(fp); goto retry; } fsp->recov_seq = seq; fsp->xfer_len = offset; fsp->xfer_contig_end = offset; fsp->state &= ~FC_SRB_RCV_STATUS; fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ return; retry: fc_fcp_retry_cmd(fsp); } /* * Handle response from SRR. */ static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) { struct fc_fcp_pkt *fsp = arg; struct fc_frame_header *fh; if (IS_ERR(fp)) { fc_fcp_srr_error(fsp, fp); return; } if (fc_fcp_lock_pkt(fsp)) goto out; fh = fc_frame_header_get(fp); /* * BUG? fc_fcp_srr_error calls exch_done which would release * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, * then fc_exch_timeout would be sending an abort. The exch_done * call by fc_fcp_srr_error would prevent fc_exch.c from seeing * an abort response though. */ if (fh->fh_type == FC_TYPE_BLS) { fc_fcp_unlock_pkt(fsp); return; } fsp->recov_seq = NULL; switch (fc_frame_payload_op(fp)) { case ELS_LS_ACC: fsp->recov_retry = 0; fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); break; case ELS_LS_RJT: default: fc_timeout_error(fsp); break; } fc_fcp_unlock_pkt(fsp); fsp->lp->tt.exch_done(seq); out: fc_frame_free(fp); fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ } static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { if (fc_fcp_lock_pkt(fsp)) goto out; fsp->lp->tt.exch_done(fsp->recov_seq); fsp->recov_seq = NULL; switch (PTR_ERR(fp)) { case -FC_EX_TIMEOUT: if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) fc_fcp_rec(fsp); else fc_timeout_error(fsp); break; case -FC_EX_CLOSED: /* e.g., link failure */ /* fall through */ default: fc_fcp_retry_cmd(fsp); break; } fc_fcp_unlock_pkt(fsp); out: fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ } static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp) { /* lock ? */ return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull; } /** * fc_queuecommand - The queuecommand function of the scsi template * @cmd: struct scsi_cmnd to be executed * @done: Callback function to be called when cmd is completed * * this is the i/o strategy routine, called by the scsi layer * this routine is called with holding the host_lock. */ int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) { struct fc_lport *lp; struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); struct fc_fcp_pkt *fsp; struct fc_rport_libfc_priv *rp; int rval; int rc = 0; struct fcoe_dev_stats *stats; lp = shost_priv(sc_cmd->device->host); rval = fc_remote_port_chkready(rport); if (rval) { sc_cmd->result = rval; done(sc_cmd); goto out; } if (!*(struct fc_remote_port **)rport->dd_data) { /* * rport is transitioning from blocked/deleted to * online */ sc_cmd->result = DID_IMM_RETRY << 16; done(sc_cmd); goto out; } rp = rport->dd_data; if (!fc_fcp_lport_queue_ready(lp)) { rc = SCSI_MLQUEUE_HOST_BUSY; goto out; } fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC); if (fsp == NULL) { rc = SCSI_MLQUEUE_HOST_BUSY; goto out; } /* * build the libfc request pkt */ fsp->cmd = sc_cmd; /* save the cmd */ fsp->lp = lp; /* save the softc ptr */ fsp->rport = rport; /* set the remote port ptr */ fsp->xfer_ddp = FC_XID_UNKNOWN; sc_cmd->scsi_done = done; /* * set up the transfer length */ fsp->data_len = scsi_bufflen(sc_cmd); fsp->xfer_len = 0; /* * setup the data direction */ stats = fc_lport_get_stats(lp); if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { fsp->req_flags = FC_SRB_READ; stats->InputRequests++; stats->InputMegabytes = fsp->data_len; } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { fsp->req_flags = FC_SRB_WRITE; stats->OutputRequests++; stats->OutputMegabytes = fsp->data_len; } else { fsp->req_flags = 0; stats->ControlRequests++; } fsp->tgt_flags = rp->flags; init_timer(&fsp->timer); fsp->timer.data = (unsigned long)fsp; /* * send it to the lower layer * if we get -1 return then put the request in the pending * queue. */ rval = fc_fcp_pkt_send(lp, fsp); if (rval != 0) { fsp->state = FC_SRB_FREE; fc_fcp_pkt_release(fsp); rc = SCSI_MLQUEUE_HOST_BUSY; } out: return rc; } EXPORT_SYMBOL(fc_queuecommand); /** * fc_io_compl() - Handle responses for completed commands * @fsp: scsi packet * * Translates a error to a Linux SCSI error. * * The fcp packet lock must be held when calling. */ static void fc_io_compl(struct fc_fcp_pkt *fsp) { struct fc_fcp_internal *si; struct scsi_cmnd *sc_cmd; struct fc_lport *lp; unsigned long flags; /* release outstanding ddp context */ fc_fcp_ddp_done(fsp); fsp->state |= FC_SRB_COMPL; if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { spin_unlock_bh(&fsp->scsi_pkt_lock); del_timer_sync(&fsp->timer); spin_lock_bh(&fsp->scsi_pkt_lock); } lp = fsp->lp; si = fc_get_scsi_internal(lp); spin_lock_irqsave(lp->host->host_lock, flags); if (!fsp->cmd) { spin_unlock_irqrestore(lp->host->host_lock, flags); return; } /* * if a command timed out while we had to try and throttle IO * and it is now getting cleaned up, then we are about to * try again so clear the throttled flag incase we get more * time outs. */ if (si->throttled && fsp->state & FC_SRB_NOMEM) si->throttled = 0; sc_cmd = fsp->cmd; fsp->cmd = NULL; if (!sc_cmd->SCp.ptr) { spin_unlock_irqrestore(lp->host->host_lock, flags); return; } CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; switch (fsp->status_code) { case FC_COMPLETE: if (fsp->cdb_status == 0) { /* * good I/O status */ sc_cmd->result = DID_OK << 16; if (fsp->scsi_resid) CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; } else if (fsp->cdb_status == QUEUE_FULL) { struct scsi_device *tmp_sdev; struct scsi_device *sdev = sc_cmd->device; shost_for_each_device(tmp_sdev, sdev->host) { if (tmp_sdev->id != sdev->id) continue; if (tmp_sdev->queue_depth > 1) { scsi_track_queue_full(tmp_sdev, tmp_sdev-> queue_depth - 1); } } sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; } else { /* * transport level I/O was ok but scsi * has non zero status */ sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; } break; case FC_ERROR: sc_cmd->result = DID_ERROR << 16; break; case FC_DATA_UNDRUN: if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { /* * scsi status is good but transport level * underrun. */ sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ? DID_OK : DID_ERROR) << 16; } else { /* * scsi got underrun, this is an error */ CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; } break; case FC_DATA_OVRRUN: /* * overrun is an error */ sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; break; case FC_CMD_ABORTED: sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; break; case FC_CMD_TIME_OUT: sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; break; case FC_CMD_RESET: sc_cmd->result = (DID_RESET << 16); break; case FC_HRD_ERROR: sc_cmd->result = (DID_NO_CONNECT << 16); break; default: sc_cmd->result = (DID_ERROR << 16); break; } list_del(&fsp->list); sc_cmd->SCp.ptr = NULL; sc_cmd->scsi_done(sc_cmd); spin_unlock_irqrestore(lp->host->host_lock, flags); /* release ref from initial allocation in queue command */ fc_fcp_pkt_release(fsp); } /** * fc_fcp_complete() - complete processing of a fcp packet * @fsp: fcp packet * * This function may sleep if a fsp timer is pending. * The host lock must not be held by caller. */ void fc_fcp_complete(struct fc_fcp_pkt *fsp) { if (fc_fcp_lock_pkt(fsp)) return; fc_fcp_complete_locked(fsp); fc_fcp_unlock_pkt(fsp); } EXPORT_SYMBOL(fc_fcp_complete); /** * fc_eh_abort() - Abort a command * @sc_cmd: scsi command to abort * * From scsi host template. * send ABTS to the target device and wait for the response * sc_cmd is the pointer to the command to be aborted. */ int fc_eh_abort(struct scsi_cmnd *sc_cmd) { struct fc_fcp_pkt *fsp; struct fc_lport *lp; int rc = FAILED; unsigned long flags; lp = shost_priv(sc_cmd->device->host); if (lp->state != LPORT_ST_READY) return rc; else if (!lp->link_up) return rc; spin_lock_irqsave(lp->host->host_lock, flags); fsp = CMD_SP(sc_cmd); if (!fsp) { /* command completed while scsi eh was setting up */ spin_unlock_irqrestore(lp->host->host_lock, flags); return SUCCESS; } /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ fc_fcp_pkt_hold(fsp); spin_unlock_irqrestore(lp->host->host_lock, flags); if (fc_fcp_lock_pkt(fsp)) { /* completed while we were waiting for timer to be deleted */ rc = SUCCESS; goto release_pkt; } rc = fc_fcp_pkt_abort(fsp); fc_fcp_unlock_pkt(fsp); release_pkt: fc_fcp_pkt_release(fsp); return rc; } EXPORT_SYMBOL(fc_eh_abort); /** * fc_eh_device_reset() Reset a single LUN * @sc_cmd: scsi command * * Set from scsi host template to send tm cmd to the target and wait for the * response. */ int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) { struct fc_lport *lp; struct fc_fcp_pkt *fsp; struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); int rc = FAILED; struct fc_rport_libfc_priv *rp; int rval; rval = fc_remote_port_chkready(rport); if (rval) goto out; rp = rport->dd_data; lp = shost_priv(sc_cmd->device->host); if (lp->state != LPORT_ST_READY) return rc; FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id); fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO); if (fsp == NULL) { printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); sc_cmd->result = DID_NO_CONNECT << 16; goto out; } /* * Build the libfc request pkt. Do not set the scsi cmnd, because * the sc passed in is not setup for execution like when sent * through the queuecommand callout. */ fsp->lp = lp; /* save the softc ptr */ fsp->rport = rport; /* set the remote port ptr */ /* * flush outstanding commands */ rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); fsp->state = FC_SRB_FREE; fc_fcp_pkt_release(fsp); out: return rc; } EXPORT_SYMBOL(fc_eh_device_reset); /** * fc_eh_host_reset() - The reset function will reset the ports on the host. * @sc_cmd: scsi command */ int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) { struct Scsi_Host *shost = sc_cmd->device->host; struct fc_lport *lp = shost_priv(shost); unsigned long wait_tmo; FC_SCSI_DBG(lp, "Resetting host\n"); lp->tt.lport_reset(lp); wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo)) msleep(1000); if (fc_fcp_lport_queue_ready(lp)) { shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " "on port (%6x)\n", fc_host_port_id(lp->host)); return SUCCESS; } else { shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " "port (%6x) is not ready.\n", fc_host_port_id(lp->host)); return FAILED; } } EXPORT_SYMBOL(fc_eh_host_reset); /** * fc_slave_alloc() - configure queue depth * @sdev: scsi device * * Configures queue depth based on host's cmd_per_len. If not set * then we use the libfc default. */ int fc_slave_alloc(struct scsi_device *sdev) { struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); int queue_depth; if (!rport || fc_remote_port_chkready(rport)) return -ENXIO; if (sdev->tagged_supported) { if (sdev->host->hostt->cmd_per_lun) queue_depth = sdev->host->hostt->cmd_per_lun; else queue_depth = FC_FCP_DFLT_QUEUE_DEPTH; scsi_activate_tcq(sdev, queue_depth); } return 0; } EXPORT_SYMBOL(fc_slave_alloc); int fc_change_queue_depth(struct scsi_device *sdev, int qdepth) { scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); return sdev->queue_depth; } EXPORT_SYMBOL(fc_change_queue_depth); int fc_change_queue_type(struct scsi_device *sdev, int tag_type) { if (sdev->tagged_supported) { scsi_set_tag_type(sdev, tag_type); if (tag_type) scsi_activate_tcq(sdev, sdev->queue_depth); else scsi_deactivate_tcq(sdev, sdev->queue_depth); } else tag_type = 0; return tag_type; } EXPORT_SYMBOL(fc_change_queue_type); void fc_fcp_destroy(struct fc_lport *lp) { struct fc_fcp_internal *si = fc_get_scsi_internal(lp); if (!list_empty(&si->scsi_pkt_queue)) printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " "port (%6x)\n", fc_host_port_id(lp->host)); mempool_destroy(si->scsi_pkt_pool); kfree(si); lp->scsi_priv = NULL; } EXPORT_SYMBOL(fc_fcp_destroy); int fc_fcp_init(struct fc_lport *lp) { int rc; struct fc_fcp_internal *si; if (!lp->tt.fcp_cmd_send) lp->tt.fcp_cmd_send = fc_fcp_cmd_send; if (!lp->tt.fcp_cleanup) lp->tt.fcp_cleanup = fc_fcp_cleanup; if (!lp->tt.fcp_abort_io) lp->tt.fcp_abort_io = fc_fcp_abort_io; si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); if (!si) return -ENOMEM; lp->scsi_priv = si; INIT_LIST_HEAD(&si->scsi_pkt_queue); si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); if (!si->scsi_pkt_pool) { rc = -ENOMEM; goto free_internal; } return 0; free_internal: kfree(si); return rc; } EXPORT_SYMBOL(fc_fcp_init); static int __init libfc_init(void) { int rc; scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", sizeof(struct fc_fcp_pkt), 0, SLAB_HWCACHE_ALIGN, NULL); if (scsi_pkt_cachep == NULL) { printk(KERN_ERR "libfc: Unable to allocate SRB cache, " "module load failed!"); return -ENOMEM; } rc = fc_setup_exch_mgr(); if (rc) goto destroy_pkt_cache; rc = fc_setup_rport(); if (rc) goto destroy_em; return rc; destroy_em: fc_destroy_exch_mgr(); destroy_pkt_cache: kmem_cache_destroy(scsi_pkt_cachep); return rc; } static void __exit libfc_exit(void) { kmem_cache_destroy(scsi_pkt_cachep); fc_destroy_exch_mgr(); fc_destroy_rport(); } module_init(libfc_init); module_exit(libfc_exit);