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path: root/drivers/scsi/libfc/fc_fcp.c
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Diffstat (limited to 'drivers/scsi/libfc/fc_fcp.c')
-rw-r--r--drivers/scsi/libfc/fc_fcp.c2131
1 files changed, 2131 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
new file mode 100644
index 000000000000..404e63ff46b8
--- /dev/null
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -0,0 +1,2131 @@
+/*
+ * 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 <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>
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("libfc");
+MODULE_LICENSE("GPL");
+
+static int fc_fcp_debug;
+
+#define FC_DEBUG_FCP(fmt...) \
+ do { \
+ if (fc_fcp_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+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 = SUGGEST_RETRY << 24;
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete_locked(fsp);
+}
+
+/*
+ * 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 (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_DEBUG_FCP("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 = lp->dev_stats[smp_processor_id()];
+ stats->ErrorFrames++;
+ if (stats->InvalidCRCCount++ < 5)
+ FC_DBG("CRC error on data frame\n");
+ /*
+ * 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_DEBUG_FCP("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_DEBUG_FCP("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 = lp->seq_offload ? seq_blen : fsp->max_payload;
+ 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);
+
+ /*
+ * If a get_page()/put_page() will fail, don't use sg lists
+ * in the fc_frame structure.
+ *
+ * The put_page() may be long after the I/O has completed
+ * in the case of FCoE, since the network driver does it
+ * via free_skb(). See the test in free_pages_check().
+ *
+ * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
+ */
+ if (using_sg) {
+ for (sg = scsi_sglist(sc); sg; sg = sg_next(sg)) {
+ if (page_count(sg_page(sg)) == 0 ||
+ (sg_page(sg)->flags & (1 << PG_lru |
+ 1 << PG_private |
+ 1 << PG_locked |
+ 1 << PG_active |
+ 1 << PG_slab |
+ 1 << PG_swapcache |
+ 1 << PG_writeback |
+ 1 << PG_reserved |
+ 1 << PG_buddy))) {
+ using_sg = 0;
+ break;
+ }
+ }
+ }
+ 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) {
+ WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
+ FC_FRAME_SG_LEN);
+ 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, "Could not allocate frame.\n"
+ "Reducing can_queue to %d.\n", can_queue);
+done:
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+}
+
+/*
+ * exch mgr calls this routine to process scsi
+ * exchanges.
+ *
+ * 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 *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;
+ lp = fsp->lp;
+
+ if (!(lp->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_DBG("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(lp);
+}
+
+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 (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_DBG("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_DBG("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 = SUGGEST_RETRY << 24;
+ }
+ }
+
+ 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 - run fn on each active command
+ * @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_cmd(fp) = fsp->cmd;
+ 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;
+
+ switch (error) {
+ case -FC_EX_CLOSED:
+ fc_fcp_retry_cmd(fsp);
+ goto unlock;
+ default:
+ FC_DBG("unknown error %ld\n", PTR_ERR(fp));
+ }
+ /*
+ * 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_lport *lp, 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_DBG("target abort cmd failed\n");
+ rc = FAILED;
+ } else if (fsp->state & FC_SRB_ABORTED) {
+ FC_DBG("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_DBG("lun reset failed\n");
+ return FAILED;
+ }
+
+ /* cdb_status holds the tmf's rsp code */
+ if (fsp->cdb_status != FCP_TMF_CMPL)
+ return FAILED;
+
+ FC_DBG("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 = SUGGEST_RETRY << 24;
+ 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, 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_DEBUG_FCP("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_DEBUG_FCP("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_DBG("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_DBG("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_status & FC_LINK_UP);
+}
+
+/**
+ * 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 */
+ 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 = lp->dev_stats[smp_processor_id()];
+ 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;
+
+ 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) {
+ /*
+ * scsi status is good but transport level
+ * underrun. for read it should be an error??
+ */
+ sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
+ } 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_ABORT << 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...from scsi host template
+ * @sc_cmd: scsi command to abort
+ *
+ * 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_status & FC_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(lp, 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;
+
+ fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
+ if (fsp == NULL) {
+ FC_DBG("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;
+
+ 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, "Host reset succeeded.\n");
+ return SUCCESS;
+ } else {
+ shost_printk(KERN_INFO, shost, "Host reset failed. "
+ "lport not ready.\n");
+ 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 "Leaked scsi packets.\n");
+
+ 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) {
+ FC_DBG("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);