| /* |
| * 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 <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/spinlock.h> |
| #include <linux/scatterlist.h> |
| #include <linux/err.h> |
| #include <linux/crc32.h> |
| #include <linux/slab.h> |
| |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_cmnd.h> |
| |
| #include <scsi/fc/fc_fc2.h> |
| |
| #include <scsi/libfc.h> |
| #include <scsi/fc_encode.h> |
| |
| #include "fc_libfc.h" |
| |
| 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 acknowledged */ |
| #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_READ (1 << 1) |
| #define FC_SRB_WRITE (1 << 0) |
| |
| /* |
| * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
| */ |
| #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 - FCP layer internal data |
| * @scsi_pkt_pool: Memory pool to draw FCP packets from |
| * @scsi_queue_lock: Protects the scsi_pkt_queue |
| * @scsi_pkt_queue: Current FCP packets |
| * @last_can_queue_ramp_down_time: ramp down time |
| * @last_can_queue_ramp_up_time: ramp up time |
| * @max_can_queue: max can_queue size |
| */ |
| struct fc_fcp_internal { |
| mempool_t *scsi_pkt_pool; |
| spinlock_t scsi_queue_lock; |
| struct list_head scsi_pkt_queue; |
| unsigned long last_can_queue_ramp_down_time; |
| unsigned long last_can_queue_ramp_up_time; |
| int max_can_queue; |
| }; |
| |
| #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 *, struct fc_frame *); |
| static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
| static void fc_fcp_timeout(unsigned long); |
| 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_CRC_ERROR 10 |
| #define FC_TIMED_OUT 11 |
| |
| /* |
| * Error recovery timeout values. |
| */ |
| #define FC_SCSI_TM_TOV (10 * HZ) |
| #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
| #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
| |
| #define FC_MAX_ERROR_CNT 5 |
| #define FC_MAX_RECOV_RETRY 3 |
| |
| #define FC_FCP_DFLT_QUEUE_DEPTH 32 |
| |
| /** |
| * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
| * @lport: The local port that the FCP packet is for |
| * @gfp: GFP flags for allocation |
| * |
| * Return value: fcp_pkt structure or null on allocation failure. |
| * Context: Can be called from process context, no lock is required. |
| */ |
| static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| struct fc_fcp_pkt *fsp; |
| |
| fsp = mempool_alloc(si->scsi_pkt_pool, gfp); |
| if (fsp) { |
| memset(fsp, 0, sizeof(*fsp)); |
| fsp->lp = lport; |
| fsp->xfer_ddp = FC_XID_UNKNOWN; |
| atomic_set(&fsp->ref_cnt, 1); |
| init_timer(&fsp->timer); |
| fsp->timer.data = (unsigned long)fsp; |
| INIT_LIST_HEAD(&fsp->list); |
| spin_lock_init(&fsp->scsi_pkt_lock); |
| } else { |
| per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; |
| put_cpu(); |
| } |
| return fsp; |
| } |
| |
| /** |
| * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
| * @fsp: The FCP packet to be released |
| * |
| * Context: Can be called from process or interrupt context, |
| * no lock is 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); |
| } |
| } |
| |
| /** |
| * fc_fcp_pkt_hold() - Hold a fcp_pkt |
| * @fsp: The FCP packet to be held |
| */ |
| static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
| { |
| atomic_inc(&fsp->ref_cnt); |
| } |
| |
| /** |
| * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
| * @seq: The sequence that the FCP packet is on (required by destructor API) |
| * @fsp: The FCP packet to be released |
| * |
| * This routine is called by a destructor callback in the exch_seq_send() |
| * routine of the libfc Transport Template. The 'struct fc_seq' is a required |
| * argument even though it is not used by this routine. |
| * |
| * Context: 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 fcp_pkt and increase its reference count |
| * @fsp: The FCP packet to be locked and incremented |
| * |
| * 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; |
| } |
| |
| /** |
| * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its |
| * reference count |
| * @fsp: The FCP packet to be unlocked and decremented |
| */ |
| static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
| { |
| spin_unlock_bh(&fsp->scsi_pkt_lock); |
| fc_fcp_pkt_release(fsp); |
| } |
| |
| /** |
| * fc_fcp_timer_set() - Start a timer for a fcp_pkt |
| * @fsp: The FCP packet to start a timer for |
| * @delay: The timeout period in jiffies |
| */ |
| 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); |
| } |
| |
| /** |
| * fc_fcp_send_abort() - Send an abort for exchanges associated with a |
| * fcp_pkt |
| * @fsp: The FCP packet to abort exchanges on |
| */ |
| static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
| { |
| if (!fsp->seq_ptr) |
| return -EINVAL; |
| |
| per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; |
| put_cpu(); |
| |
| fsp->state |= FC_SRB_ABORT_PENDING; |
| return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); |
| } |
| |
| /** |
| * fc_fcp_retry_cmd() - Retry a fcp_pkt |
| * @fsp: The FCP packet to be retried |
| * |
| * Sets the status code to be FC_ERROR and then calls |
| * fc_fcp_complete_locked() which in turn calls fc_io_compl(). |
| * fc_io_compl() will notify the SCSI-ml that the I/O is done. |
| * The SCSI-ml will retry the command. |
| */ |
| 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 a LLD's ddp_setup routine to set up DDP context |
| * @fsp: The FCP packet that will manage the DDP frames |
| * @xid: The XID that will be used for the DDP exchange |
| */ |
| void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) |
| { |
| struct fc_lport *lport; |
| |
| lport = fsp->lp; |
| if ((fsp->req_flags & FC_SRB_READ) && |
| (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
| if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), |
| scsi_sg_count(fsp->cmd))) |
| fsp->xfer_ddp = xid; |
| } |
| } |
| |
| /** |
| * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any |
| * DDP related resources for a fcp_pkt |
| * @fsp: The FCP packet that DDP had been used on |
| */ |
| void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
| { |
| struct fc_lport *lport; |
| |
| if (!fsp) |
| return; |
| |
| if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
| return; |
| |
| lport = fsp->lp; |
| if (lport->tt.ddp_done) { |
| fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); |
| fsp->xfer_ddp = FC_XID_UNKNOWN; |
| } |
| } |
| |
| /** |
| * fc_fcp_can_queue_ramp_up() - increases can_queue |
| * @lport: lport to ramp up can_queue |
| */ |
| static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| unsigned long flags; |
| int can_queue; |
| |
| spin_lock_irqsave(lport->host->host_lock, flags); |
| |
| if (si->last_can_queue_ramp_up_time && |
| (time_before(jiffies, si->last_can_queue_ramp_up_time + |
| FC_CAN_QUEUE_PERIOD))) |
| goto unlock; |
| |
| if (time_before(jiffies, si->last_can_queue_ramp_down_time + |
| FC_CAN_QUEUE_PERIOD)) |
| goto unlock; |
| |
| si->last_can_queue_ramp_up_time = jiffies; |
| |
| can_queue = lport->host->can_queue << 1; |
| if (can_queue >= si->max_can_queue) { |
| can_queue = si->max_can_queue; |
| si->last_can_queue_ramp_down_time = 0; |
| } |
| lport->host->can_queue = can_queue; |
| shost_printk(KERN_ERR, lport->host, "libfc: increased " |
| "can_queue to %d.\n", can_queue); |
| |
| unlock: |
| spin_unlock_irqrestore(lport->host->host_lock, flags); |
| } |
| |
| /** |
| * fc_fcp_can_queue_ramp_down() - reduces can_queue |
| * @lport: lport to reduce can_queue |
| * |
| * 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_can_queue_ramp_down(struct fc_lport *lport) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| unsigned long flags; |
| int can_queue; |
| |
| spin_lock_irqsave(lport->host->host_lock, flags); |
| |
| if (si->last_can_queue_ramp_down_time && |
| (time_before(jiffies, si->last_can_queue_ramp_down_time + |
| FC_CAN_QUEUE_PERIOD))) |
| goto unlock; |
| |
| si->last_can_queue_ramp_down_time = jiffies; |
| |
| can_queue = lport->host->can_queue; |
| can_queue >>= 1; |
| if (!can_queue) |
| can_queue = 1; |
| lport->host->can_queue = can_queue; |
| shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" |
| "Reducing can_queue to %d.\n", can_queue); |
| |
| unlock: |
| spin_unlock_irqrestore(lport->host->host_lock, flags); |
| } |
| |
| /* |
| * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. |
| * @lport: fc lport struct |
| * @len: payload length |
| * |
| * Allocates fc_frame structure and buffer but if fails to allocate |
| * then reduce can_queue. |
| */ |
| static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, |
| size_t len) |
| { |
| struct fc_frame *fp; |
| |
| fp = fc_frame_alloc(lport, len); |
| if (likely(fp)) |
| return fp; |
| |
| per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; |
| put_cpu(); |
| /* error case */ |
| fc_fcp_can_queue_ramp_down(lport); |
| return NULL; |
| } |
| |
| /** |
| * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target |
| * @fsp: The FCP packet the data is on |
| * @fp: The data frame |
| */ |
| static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| { |
| struct scsi_cmnd *sc = fsp->cmd; |
| struct fc_lport *lport = fsp->lp; |
| struct fc_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; |
| u32 nents; |
| u8 host_bcode = FC_COMPLETE; |
| |
| 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 then clear it and initiate recovery since data |
| * frames are expected to be placed directly in that case. |
| * |
| * Indicate error to scsi-ml because something went wrong with the |
| * ddp handling to get us here. |
| */ |
| if (fsp->xfer_ddp != FC_XID_UNKNOWN) { |
| fc_fcp_ddp_done(fsp); |
| FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
| host_bcode = FC_ERROR; |
| goto err; |
| } |
| 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); |
| |
| /* Data is corrupted indicate scsi-ml should retry */ |
| host_bcode = FC_DATA_OVRRUN; |
| goto err; |
| } |
| if (offset != fsp->xfer_len) |
| fsp->state |= FC_SRB_DISCONTIG; |
| |
| sg = scsi_sglist(sc); |
| nents = scsi_sg_count(sc); |
| |
| if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
| copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, |
| &offset, NULL); |
| } else { |
| crc = crc32(~0, (u8 *) fh, sizeof(*fh)); |
| copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, |
| &offset, &crc); |
| buf = fc_frame_payload_get(fp, 0); |
| if (len % 4) |
| crc = crc32(crc, buf + len, 4 - (len % 4)); |
| |
| if (~crc != le32_to_cpu(fr_crc(fp))) { |
| crc_err: |
| stats = per_cpu_ptr(lport->stats, get_cpu()); |
| stats->ErrorFrames++; |
| /* per cpu count, not total count, but OK for limit */ |
| if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) |
| printk(KERN_WARNING "libfc: CRC error on data " |
| "frame for port (%6.6x)\n", |
| lport->port_id); |
| put_cpu(); |
| /* |
| * 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) { |
| host_bcode = FC_CRC_ERROR; |
| goto err; |
| } |
| 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); |
| return; |
| err: |
| fc_fcp_recovery(fsp, host_bcode); |
| } |
| |
| /** |
| * fc_fcp_send_data() - Send SCSI data to a target |
| * @fsp: The FCP packet the data is on |
| * @sp: The sequence the data is to be sent on |
| * @offset: The starting offset for this data request |
| * @seq_blen: The burst length for this data request |
| * |
| * Called after receiving a Transfer Ready data descriptor. |
| * If the LLD is capable of sequence offload then send down the |
| * seq_blen amount of data in single frame, otherwise send |
| * multiple frames of the maximum frame payload supported by |
| * the target port. |
| */ |
| 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 *lport = fsp->lp; |
| struct page *page; |
| size_t remaining; |
| size_t t_blen; |
| size_t tlen; |
| size_t sg_bytes; |
| size_t frame_offset, fh_parm_offset; |
| size_t off; |
| int error; |
| void *data = NULL; |
| void *page_addr; |
| int using_sg = lport->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 (lport->seq_offload) { |
| t_blen = min(seq_blen, (size_t)lport->lso_max); |
| FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
| fsp, seq_blen, lport->lso_max, t_blen); |
| } |
| |
| if (t_blen > 512) |
| t_blen &= ~(512 - 1); /* round down to block size */ |
| sc = fsp->cmd; |
| |
| remaining = seq_blen; |
| fh_parm_offset = frame_offset = offset; |
| tlen = 0; |
| seq = lport->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; |
| fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
| if (!fp) |
| return -ENOMEM; |
| |
| data = fc_frame_header_get(fp) + 1; |
| fh_parm_offset = frame_offset; |
| fr_max_payload(fp) = fsp->max_payload; |
| } |
| |
| off = offset + sg->offset; |
| sg_bytes = min(tlen, sg->length - offset); |
| sg_bytes = min(sg_bytes, |
| (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); |
| page = sg_page(sg) + (off >> PAGE_SHIFT); |
| if (using_sg) { |
| get_page(page); |
| skb_fill_page_desc(fp_skb(fp), |
| skb_shinfo(fp_skb(fp))->nr_frags, |
| page, off & ~PAGE_MASK, sg_bytes); |
| fp_skb(fp)->data_len += sg_bytes; |
| fr_len(fp) += sg_bytes; |
| fp_skb(fp)->truesize += PAGE_SIZE; |
| } else { |
| /* |
| * The scatterlist item may be bigger than PAGE_SIZE, |
| * but we must not cross pages inside the kmap. |
| */ |
| page_addr = kmap_atomic(page); |
| memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
| sg_bytes); |
| kunmap_atomic(page_addr); |
| data += sg_bytes; |
| } |
| offset += sg_bytes; |
| frame_offset += sg_bytes; |
| tlen -= sg_bytes; |
| remaining -= sg_bytes; |
| |
| if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
| (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 = lport->tt.seq_send(lport, seq, fp); |
| if (error) { |
| WARN_ON(1); /* send error should be rare */ |
| return error; |
| } |
| fp = NULL; |
| } |
| fsp->xfer_len += seq_blen; /* premature count? */ |
| return 0; |
| } |
| |
| /** |
| * fc_fcp_abts_resp() - Receive an ABTS response |
| * @fsp: The FCP packet that is being aborted |
| * @fp: The response frame |
| */ |
| 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_recv() - Receive an FCP frame |
| * @seq: The sequence the frame is on |
| * @fp: The received frame |
| * @arg: The related FCP packet |
| * |
| * Context: Called from Soft IRQ context. Can not be called |
| * holding the FCP packet 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)) { |
| fc_fcp_error(fsp, fp); |
| return; |
| } |
| |
| 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; |
| |
| 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 (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); |
| } |
| |
| /** |
| * fc_fcp_resp() - Handler for FCP responses |
| * @fsp: The FCP packet the response is for |
| * @fp: The response frame |
| */ |
| 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 != FCP_RESP_RSP_INFO_LEN4) && |
| (respl != FCP_RESP_RSP_INFO_LEN8)) |
| 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; |
| } |
| } |
| 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 transferred 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->cdb_status == SAM_STAT_GOOD && |
| 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 %6.6x 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_pkt with the |
| * fcp_pkt lock held |
| * @fsp: The FCP packet to be completed |
| * |
| * 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 *lport = 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->cdb_status == SAM_STAT_GOOD && |
| 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; |
| } |
| |
| 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 = lport->tt.seq_start_next(seq); |
| conf_frame = fc_fcp_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); |
| lport->tt.seq_send(lport, csp, conf_frame); |
| } |
| } |
| lport->tt.exch_done(seq); |
| } |
| /* |
| * Some resets driven by SCSI are not I/Os and do not have |
| * SCSI commands associated with the requests. We should not |
| * call I/O completion if we do not have a SCSI command. |
| */ |
| if (fsp->cmd) |
| fc_io_compl(fsp); |
| } |
| |
| /** |
| * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt |
| * @fsp: The FCP packet whose exchanges should be canceled |
| * @error: The reason for the cancellation |
| */ |
| static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
| { |
| struct fc_lport *lport = fsp->lp; |
| |
| if (fsp->seq_ptr) { |
| lport->tt.exch_done(fsp->seq_ptr); |
| fsp->seq_ptr = NULL; |
| } |
| fsp->status_code = error; |
| } |
| |
| /** |
| * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
| * @lport: The local port whose exchanges should be canceled |
| * @id: The target's ID |
| * @lun: The LUN |
| * @error: The reason for cancellation |
| * |
| * If lun or id is -1, they are ignored. |
| */ |
| static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
| unsigned int lun, int error) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| struct fc_fcp_pkt *fsp; |
| struct scsi_cmnd *sc_cmd; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&si->scsi_queue_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(&si->scsi_queue_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(&si->scsi_queue_lock, flags); |
| /* |
| * while we dropped the lock multiple pkts could |
| * have been released, so we have to start over. |
| */ |
| goto restart; |
| } |
| spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| } |
| |
| /** |
| * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port |
| * @lport: The local port whose exchanges are to be aborted |
| */ |
| static void fc_fcp_abort_io(struct fc_lport *lport) |
| { |
| fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
| } |
| |
| /** |
| * fc_fcp_pkt_send() - Send a fcp_pkt |
| * @lport: The local port to send the FCP packet on |
| * @fsp: The FCP packet to send |
| * |
| * Return: Zero for success and -1 for failure |
| * Locks: Called without locks held |
| */ |
| static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| unsigned long flags; |
| 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, &fsp->cdb_cmd.fc_lun); |
| memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); |
| |
| spin_lock_irqsave(&si->scsi_queue_lock, flags); |
| list_add_tail(&fsp->list, &si->scsi_pkt_queue); |
| spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
| if (unlikely(rc)) { |
| spin_lock_irqsave(&si->scsi_queue_lock, flags); |
| fsp->cmd->SCp.ptr = NULL; |
| list_del(&fsp->list); |
| spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| } |
| |
| return rc; |
| } |
| |
| /** |
| * get_fsp_rec_tov() - Helper function to get REC_TOV |
| * @fsp: the FCP packet |
| * |
| * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second |
| */ |
| static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) |
| { |
| struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; |
| |
| return msecs_to_jiffies(rpriv->e_d_tov) + HZ; |
| } |
| |
| /** |
| * fc_fcp_cmd_send() - Send a FCP command |
| * @lport: The local port to send the command on |
| * @fsp: The FCP packet the command is on |
| * @resp: The handler for the response |
| */ |
| static int fc_fcp_cmd_send(struct fc_lport *lport, 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 *rpriv; |
| const size_t len = sizeof(fsp->cdb_cmd); |
| int rc = 0; |
| |
| if (fc_fcp_lock_pkt(fsp)) |
| return 0; |
| |
| fp = fc_fcp_frame_alloc(lport, 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; |
| rpriv = rport->dd_data; |
| |
| fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, |
| rpriv->local_port->port_id, FC_TYPE_FCP, |
| FC_FCTL_REQ, 0); |
| |
| seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
| fsp, 0); |
| if (!seq) { |
| rc = -1; |
| goto unlock; |
| } |
| 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); |
| if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
| fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
| |
| unlock: |
| fc_fcp_unlock_pkt(fsp); |
| return rc; |
| } |
| |
| /** |
| * fc_fcp_error() - Handler for FCP layer errors |
| * @fsp: The FCP packet the error is on |
| * @fp: The frame that has errored |
| */ |
| 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); |
| } |
| |
| /** |
| * fc_fcp_pkt_abort() - Abort a fcp_pkt |
| * @fsp: The FCP packet to abort on |
| * |
| * Called to send an abort and then wait for abort completion |
| */ |
| static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
| { |
| int rc = FAILED; |
| unsigned long ticks_left; |
| |
| 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); |
| ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
| FC_SCSI_TM_TOV); |
| spin_lock_bh(&fsp->scsi_pkt_lock); |
| fsp->wait_for_comp = 0; |
| |
| if (!ticks_left) { |
| FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
| } 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; |
| } |
| |
| /** |
| * fc_lun_reset_send() - Send LUN reset command |
| * @data: The FCP packet that identifies the LUN to be reset |
| */ |
| static void fc_lun_reset_send(unsigned long data) |
| { |
| struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; |
| struct fc_lport *lport = fsp->lp; |
| |
| if (lport->tt.fcp_cmd_send(lport, 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, get_fsp_rec_tov(fsp)); |
| fc_fcp_unlock_pkt(fsp); |
| } |
| } |
| |
| /** |
| * fc_lun_reset() - Send a LUN RESET command to a device |
| * and wait for the reply |
| * @lport: The local port to sent the command on |
| * @fsp: The FCP packet that identifies the LUN to be reset |
| * @id: The SCSI command ID |
| * @lun: The LUN ID to be reset |
| */ |
| static int fc_lun_reset(struct fc_lport *lport, 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, &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) { |
| lport->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(lport, "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(lport, "lun reset to lun %u completed\n", lun); |
| fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); |
| return SUCCESS; |
| } |
| |
| /** |
| * fc_tm_done() - Task Management response handler |
| * @seq: The sequence that the response is on |
| * @fp: The response frame |
| * @arg: The FCP packet the response is for |
| */ |
| 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)) |
| goto out; |
| |
| /* |
| * raced with eh timeout handler. |
| */ |
| if (!fsp->seq_ptr || !fsp->wait_for_comp) |
| goto out_unlock; |
| |
| 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); |
| out_unlock: |
| fc_fcp_unlock_pkt(fsp); |
| out: |
| fc_frame_free(fp); |
| } |
| |
| /** |
| * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port |
| * @lport: The local port to be cleaned up |
| */ |
| static void fc_fcp_cleanup(struct fc_lport *lport) |
| { |
| fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
| } |
| |
| /** |
| * fc_fcp_timeout() - Handler for fcp_pkt timeouts |
| * @data: The FCP packet that has timed out |
| * |
| * If REC is supported then 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 then 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 *rpriv = 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 (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
| fc_fcp_rec(fsp); |
| else if (fsp->state & FC_SRB_RCV_STATUS) |
| fc_fcp_complete_locked(fsp); |
| else |
| fc_fcp_recovery(fsp, FC_TIMED_OUT); |
| fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
| unlock: |
| fc_fcp_unlock_pkt(fsp); |
| } |
| |
| /** |
| * fc_fcp_rec() - Send a REC ELS request |
| * @fsp: The FCP packet to send the REC request on |
| */ |
| static void fc_fcp_rec(struct fc_fcp_pkt *fsp) |
| { |
| struct fc_lport *lport; |
| struct fc_frame *fp; |
| struct fc_rport *rport; |
| struct fc_rport_libfc_priv *rpriv; |
| |
| lport = fsp->lp; |
| rport = fsp->rport; |
| rpriv = rport->dd_data; |
| if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { |
| fsp->status_code = FC_HRD_ERROR; |
| fsp->io_status = 0; |
| fc_fcp_complete_locked(fsp); |
| return; |
| } |
| |
| fp = fc_fcp_frame_alloc(lport, 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, |
| rpriv->local_port->port_id, FC_TYPE_ELS, |
| FC_FCTL_REQ, 0); |
| if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
| fc_fcp_rec_resp, fsp, |
| 2 * lport->r_a_tov)) { |
| fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
| return; |
| } |
| retry: |
| if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
| fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
| else |
| fc_fcp_recovery(fsp, FC_TIMED_OUT); |
| } |
| |
| /** |
| * fc_fcp_rec_resp() - Handler for REC ELS responses |
| * @seq: The sequence the response is on |
| * @fp: The response frame |
| * @arg: The FCP packet the response is on |
| * |
| * If the response is a reject then the scsi layer will handle |
| * the timeout. If the response is a LS_ACC then if the I/O was not completed |
| * set the timeout and return. If the I/O was completed then complete the |
| * exchange and tell the SCSI layer. |
| */ |
| 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 *rpriv; |
| |
| 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"); |
| rpriv = fsp->rport->dd_data; |
| /* |
| * if we do not spport RECs or got some bogus |
| * reason then resetup timer so we check for |
| * making progress. |
| */ |
| rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
| 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_fcp_recovery(fsp, FC_ERROR); |
| 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, get_fsp_rec_tov(fsp)); |
| } 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); |
| } |
| |
| /** |
| * fc_fcp_rec_error() - Handler for REC errors |
| * @fsp: The FCP packet the error is on |
| * @fp: The REC frame |
| */ |
| 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 %6.6x 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 %6.6x 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_fcp_recovery(fsp, FC_ERROR); |
| break; |
| } |
| fc_fcp_unlock_pkt(fsp); |
| out: |
| fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ |
| } |
| |
| /** |
| * fc_fcp_recovery() - Handler for fcp_pkt recovery |
| * @fsp: The FCP pkt that needs to be aborted |
| */ |
| static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
| { |
| fsp->status_code = code; |
| 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); |
| } |
| |
| /** |
| * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) |
| * @fsp: The FCP packet the SRR is to be sent on |
| * @r_ctl: The R_CTL field for the SRR 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 *lport = fsp->lp; |
| struct fc_rport *rport; |
| struct fc_rport_libfc_priv *rpriv; |
| struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
| struct fc_seq *seq; |
| struct fcp_srr *srr; |
| struct fc_frame *fp; |
| unsigned int rec_tov; |
| |
| rport = fsp->rport; |
| rpriv = rport->dd_data; |
| |
| if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
| rpriv->rp_state != RPORT_ST_READY) |
| goto retry; /* shouldn't happen */ |
| fp = fc_fcp_frame_alloc(lport, 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, |
| rpriv->local_port->port_id, FC_TYPE_FCP, |
| FC_FCTL_REQ, 0); |
| |
| rec_tov = get_fsp_rec_tov(fsp); |
| seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, |
| fc_fcp_pkt_destroy, |
| fsp, jiffies_to_msecs(rec_tov)); |
| if (!seq) |
| 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); |
| } |
| |
| /** |
| * fc_fcp_srr_resp() - Handler for SRR response |
| * @seq: The sequence the SRR is on |
| * @fp: The SRR frame |
| * @arg: The FCP packet the SRR is on |
| */ |
| 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; |
| } |
| |
| switch (fc_frame_payload_op(fp)) { |
| case ELS_LS_ACC: |
| fsp->recov_retry = 0; |
| fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
| break; |
| case ELS_LS_RJT: |
| default: |
| fc_fcp_recovery(fsp, FC_ERROR); |
| break; |
| } |
| fc_fcp_unlock_pkt(fsp); |
| out: |
| fsp->lp->tt.exch_done(seq); |
| fc_frame_free(fp); |
| } |
| |
| /** |
| * fc_fcp_srr_error() - Handler for SRR errors |
| * @fsp: The FCP packet that the SRR error is on |
| * @fp: The SRR frame |
| */ |
| static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| { |
| if (fc_fcp_lock_pkt(fsp)) |
| goto out; |
| switch (PTR_ERR(fp)) { |
| case -FC_EX_TIMEOUT: |
| if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
| fc_fcp_rec(fsp); |
| else |
| fc_fcp_recovery(fsp, FC_TIMED_OUT); |
| break; |
| case -FC_EX_CLOSED: /* e.g., link failure */ |
| /* fall through */ |
| default: |
| fc_fcp_retry_cmd(fsp); |
| break; |
| } |
| fc_fcp_unlock_pkt(fsp); |
| out: |
| fsp->lp->tt.exch_done(fsp->recov_seq); |
| } |
| |
| /** |
| * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready |
| * @lport: The local port to be checked |
| */ |
| static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) |
| { |
| /* lock ? */ |
| return (lport->state == LPORT_ST_READY) && |
| lport->link_up && !lport->qfull; |
| } |
| |
| /** |
| * fc_queuecommand() - The queuecommand function of the SCSI template |
| * @shost: The Scsi_Host that the command was issued to |
| * @cmd: The scsi_cmnd to be executed |
| * |
| * This is the i/o strategy routine, called by the SCSI layer. |
| */ |
| int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
| { |
| struct fc_lport *lport = shost_priv(shost); |
| struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
| struct fc_fcp_pkt *fsp; |
| struct fc_rport_libfc_priv *rpriv; |
| int rval; |
| int rc = 0; |
| struct fc_stats *stats; |
| |
| rval = fc_remote_port_chkready(rport); |
| if (rval) { |
| sc_cmd->result = rval; |
| sc_cmd->scsi_done(sc_cmd); |
| return 0; |
| } |
| |
| if (!*(struct fc_remote_port **)rport->dd_data) { |
| /* |
| * rport is transitioning from blocked/deleted to |
| * online |
| */ |
| sc_cmd->result = DID_IMM_RETRY << 16; |
| sc_cmd->scsi_done(sc_cmd); |
| goto out; |
| } |
| |
| rpriv = rport->dd_data; |
| |
| if (!fc_fcp_lport_queue_ready(lport)) { |
| if (lport->qfull) |
| fc_fcp_can_queue_ramp_down(lport); |
| rc = SCSI_MLQUEUE_HOST_BUSY; |
| goto out; |
| } |
| |
| fsp = fc_fcp_pkt_alloc(lport, 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->rport = rport; /* set the remote port ptr */ |
| |
| /* |
| * set up the transfer length |
| */ |
| fsp->data_len = scsi_bufflen(sc_cmd); |
| fsp->xfer_len = 0; |
| |
| /* |
| * setup the data direction |
| */ |
| stats = per_cpu_ptr(lport->stats, get_cpu()); |
| if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
| fsp->req_flags = FC_SRB_READ; |
| stats->InputRequests++; |
| stats->InputBytes += fsp->data_len; |
| } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
| fsp->req_flags = FC_SRB_WRITE; |
| stats->OutputRequests++; |
| stats->OutputBytes += fsp->data_len; |
| } else { |
| fsp->req_flags = 0; |
| stats->ControlRequests++; |
| } |
| put_cpu(); |
| |
| /* |
| * send it to the lower layer |
| * if we get -1 return then put the request in the pending |
| * queue. |
| */ |
| rval = fc_fcp_pkt_send(lport, 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: The FCP packet that is complete |
| * |
| * Translates fcp_pkt errors to a Linux SCSI errors. |
| * 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 *lport; |
| 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); |
| } |
| |
| lport = fsp->lp; |
| si = fc_get_scsi_internal(lport); |
| |
| /* |
| * if can_queue ramp down is done then try can_queue ramp up |
| * since commands are completing now. |
| */ |
| if (si->last_can_queue_ramp_down_time) |
| fc_fcp_can_queue_ramp_up(lport); |
| |
| sc_cmd = fsp->cmd; |
| 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 { |
| /* |
| * 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: |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| "due to FC_ERROR\n"); |
| 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. |
| */ |
| if (fsp->state & FC_SRB_RCV_STATUS) { |
| sc_cmd->result = DID_OK << 16; |
| } else { |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" |
| " due to FC_DATA_UNDRUN (trans)\n"); |
| sc_cmd->result = DID_ERROR << 16; |
| } |
| } else { |
| /* |
| * scsi got underrun, this is an error |
| */ |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| "due to FC_DATA_UNDRUN (scsi)\n"); |
| 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 |
| */ |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| "due to FC_DATA_OVRRUN\n"); |
| sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
| break; |
| case FC_CMD_ABORTED: |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| "due to FC_CMD_ABORTED\n"); |
| sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
| break; |
| case FC_CMD_RESET: |
| FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
| "due to FC_CMD_RESET\n"); |
| sc_cmd->result = (DID_RESET << 16); |
| break; |
| case FC_HRD_ERROR: |
| FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
| "due to FC_HRD_ERROR\n"); |
| sc_cmd->result = (DID_NO_CONNECT << 16); |
| break; |
| case FC_CRC_ERROR: |
| FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " |
| "due to FC_CRC_ERROR\n"); |
| sc_cmd->result = (DID_PARITY << 16); |
| break; |
| case FC_TIMED_OUT: |
| FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " |
| "due to FC_TIMED_OUT\n"); |
| sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; |
| break; |
| default: |
| FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| "due to unknown error\n"); |
| sc_cmd->result = (DID_ERROR << 16); |
| break; |
| } |
| |
| if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
| sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); |
| |
| spin_lock_irqsave(&si->scsi_queue_lock, flags); |
| list_del(&fsp->list); |
| sc_cmd->SCp.ptr = NULL; |
| spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| sc_cmd->scsi_done(sc_cmd); |
| |
| /* release ref from initial allocation in queue command */ |
| fc_fcp_pkt_release(fsp); |
| } |
| |
| /** |
| * fc_eh_abort() - Abort a command |
| * @sc_cmd: The SCSI command to abort |
| * |
| * From SCSI host template. |
| * Send an ABTS to the target device and wait for the response. |
| */ |
| int fc_eh_abort(struct scsi_cmnd *sc_cmd) |
| { |
| struct fc_fcp_pkt *fsp; |
| struct fc_lport *lport; |
| struct fc_fcp_internal *si; |
| int rc = FAILED; |
| unsigned long flags; |
| int rval; |
| |
| rval = fc_block_scsi_eh(sc_cmd); |
| if (rval) |
| return rval; |
| |
| lport = shost_priv(sc_cmd->device->host); |
| if (lport->state != LPORT_ST_READY) |
| return rc; |
| else if (!lport->link_up) |
| return rc; |
| |
| si = fc_get_scsi_internal(lport); |
| spin_lock_irqsave(&si->scsi_queue_lock, flags); |
| fsp = CMD_SP(sc_cmd); |
| if (!fsp) { |
| /* command completed while scsi eh was setting up */ |
| spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| return SUCCESS; |
| } |
| /* grab a ref so the fsp and sc_cmd cannot be released from under us */ |
| fc_fcp_pkt_hold(fsp); |
| spin_unlock_irqrestore(&si->scsi_queue_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: The SCSI command which identifies the device whose |
| * LUN is to be reset |
| * |
| * Set from SCSI host template. |
| */ |
| int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) |
| { |
| struct fc_lport *lport; |
| struct fc_fcp_pkt *fsp; |
| struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
| int rc = FAILED; |
| int rval; |
| |
| rval = fc_block_scsi_eh(sc_cmd); |
| if (rval) |
| return rval; |
| |
| lport = shost_priv(sc_cmd->device->host); |
| |
| if (lport->state != LPORT_ST_READY) |
| return rc; |
| |
| FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
| |
| fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
| if (fsp == NULL) { |
| printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
| 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->rport = rport; /* set the remote port ptr */ |
| |
| /* |
| * flush outstanding commands |
| */ |
| rc = fc_lun_reset(lport, 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() - Reset a Scsi_Host. |
| * @sc_cmd: The SCSI command that identifies the SCSI host to be reset |
| */ |
| int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) |
| { |
| struct Scsi_Host *shost = sc_cmd->device->host; |
| struct fc_lport *lport = shost_priv(shost); |
| unsigned long wait_tmo; |
| |
| FC_SCSI_DBG(lport, "Resetting host\n"); |
| |
| fc_block_scsi_eh(sc_cmd); |
| |
| lport->tt.lport_reset(lport); |
| wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
| while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
| wait_tmo)) |
| msleep(1000); |
| |
| if (fc_fcp_lport_queue_ready(lport)) { |
| shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
| "on port (%6.6x)\n", lport->port_id); |
| return SUCCESS; |
| } else { |
| shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
| "port (%6.6x) is not ready.\n", |
| lport->port_id); |
| return FAILED; |
| } |
| } |
| EXPORT_SYMBOL(fc_eh_host_reset); |
| |
| /** |
| * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
| * @sdev: The SCSI device that identifies the SCSI host |
| * |
| * 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)); |
| |
| if (!rport || fc_remote_port_chkready(rport)) |
| return -ENXIO; |
| |
| if (sdev->tagged_supported) |
| scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); |
| else |
| scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), |
| FC_FCP_DFLT_QUEUE_DEPTH); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(fc_slave_alloc); |
| |
| /** |
| * fc_change_queue_depth() - Change a device's queue depth |
| * @sdev: The SCSI device whose queue depth is to change |
| * @qdepth: The new queue depth |
| * @reason: The resason for the change |
| */ |
| int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
| { |
| switch (reason) { |
| case SCSI_QDEPTH_DEFAULT: |
| scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); |
| break; |
| case SCSI_QDEPTH_QFULL: |
| scsi_track_queue_full(sdev, qdepth); |
| break; |
| case SCSI_QDEPTH_RAMP_UP: |
| scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| return sdev->queue_depth; |
| } |
| EXPORT_SYMBOL(fc_change_queue_depth); |
| |
| /** |
| * fc_fcp_destory() - Tear down the FCP layer for a given local port |
| * @lport: The local port that no longer needs the FCP layer |
| */ |
| void fc_fcp_destroy(struct fc_lport *lport) |
| { |
| struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| |
| if (!list_empty(&si->scsi_pkt_queue)) |
| printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
| "port (%6.6x)\n", lport->port_id); |
| |
| mempool_destroy(si->scsi_pkt_pool); |
| kfree(si); |
| lport->scsi_priv = NULL; |
| } |
| EXPORT_SYMBOL(fc_fcp_destroy); |
| |
| int fc_setup_fcp(void) |
| { |
| int rc = 0; |
| |
| scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", |
| sizeof(struct fc_fcp_pkt), |
| 0, SLAB_HWCACHE_ALIGN, NULL); |
| if (!scsi_pkt_cachep) { |
| printk(KERN_ERR "libfc: Unable to allocate SRB cache, " |
| "module load failed!"); |
| rc = -ENOMEM; |
| } |
| |
| return rc; |
| } |
| |
| void fc_destroy_fcp(void) |
| { |
| if (scsi_pkt_cachep) |
| kmem_cache_destroy(scsi_pkt_cachep); |
| } |
| |
| /** |
| * fc_fcp_init() - Initialize the FCP layer for a local port |
| * @lport: The local port to initialize the exchange layer for |
| */ |
| int fc_fcp_init(struct fc_lport *lport) |
| { |
| int rc; |
| struct fc_fcp_internal *si; |
| |
| if (!lport->tt.fcp_cmd_send) |
| lport->tt.fcp_cmd_send = fc_fcp_cmd_send; |
| |
| if (!lport->tt.fcp_cleanup) |
| lport->tt.fcp_cleanup = fc_fcp_cleanup; |
| |
| if (!lport->tt.fcp_abort_io) |
| lport->tt.fcp_abort_io = fc_fcp_abort_io; |
| |
| si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); |
| if (!si) |
| return -ENOMEM; |
| lport->scsi_priv = si; |
| si->max_can_queue = lport->host->can_queue; |
| INIT_LIST_HEAD(&si->scsi_pkt_queue); |
| spin_lock_init(&si->scsi_queue_lock); |
| |
| 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); |