1 files changed, 70 insertions, 5 deletions

diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index 2a631d7dbcec..a5725f3b7ce1 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -259,12 +259,62 @@ static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
         }
 
         fsp->state &= ~FC_SRB_ABORT_PENDING;
-        fsp->io_status = SUGGEST_RETRY << 24;
+        fsp->io_status = 0;
         fsp->status_code = FC_ERROR;
         fc_fcp_complete_locked(fsp);
 }
 
 /*
+ * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP
+ * transfer for a read I/O indicated by the fc_fcp_pkt.
+ * @fsp: ptr to the fc_fcp_pkt
+ *
+ * This is called in exch_seq_send() when we have a newly allocated
+ * exchange with a valid exchange id to setup ddp.
+ *
+ * returns: none
+ */
+void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
+{
+        struct fc_lport *lp;
+
+        if (!fsp)
+                return;
+
+        lp = fsp->lp;
+        if ((fsp->req_flags & FC_SRB_READ) &&
+            (lp->lro_enabled) && (lp->tt.ddp_setup)) {
+                if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd),
+                                     scsi_sg_count(fsp->cmd)))
+                        fsp->xfer_ddp = xid;
+        }
+}
+EXPORT_SYMBOL(fc_fcp_ddp_setup);
+
+/*
+ * fc_fcp_ddp_done - calls to LLD's ddp_done to release any
+ * DDP related resources for this I/O if it is initialized
+ * as a ddp transfer
+ * @fsp: ptr to the fc_fcp_pkt
+ *
+ * returns: none
+ */
+static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
+{
+        struct fc_lport *lp;
+
+        if (!fsp)
+                return;
+
+        lp = fsp->lp;
+        if (fsp->xfer_ddp && lp->tt.ddp_done) {
+                fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
+                fsp->xfer_ddp = 0;
+        }
+}
+
+
+/*
  * Receive SCSI data from target.
  * Called after receiving solicited data.
  */
@@ -289,6 +339,9 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
         len = fr_len(fp) - sizeof(*fh);
         buf = fc_frame_payload_get(fp, 0);
 
+        /* if this I/O is ddped, update xfer len */
+        fc_fcp_ddp_done(fsp);
+
         if (offset + len > fsp->data_len) {
                 /* this should never happen */
                 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
@@ -435,7 +488,13 @@ static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
          * 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;
+        t_blen = fsp->max_payload;
+        if (lp->seq_offload) {
+                t_blen = min(seq_blen, (size_t)lp->lso_max);
+                FC_DEBUG_FCP("fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
+                           fsp, seq_blen, lp->lso_max, t_blen);
+        }
+
         WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
         if (t_blen > 512)
                 t_blen &= ~(512 - 1);   /* round down to block size */
@@ -744,6 +803,9 @@ static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
         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)) {
@@ -859,7 +921,7 @@ static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
                     (!(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;
+                        fsp->io_status = 0;
                 }
         }
 
@@ -1006,7 +1068,7 @@ static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
         }
 
         memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
-        fr_cmd(fp) = fsp->cmd;
+        fr_fsp(fp) = fsp;
         rport = fsp->rport;
         fsp->max_payload = rport->maxframe_size;
         rp = rport->dd_data;
@@ -1267,7 +1329,7 @@ static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
         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;
+                fsp->io_status = 0;
                 fc_fcp_complete_locked(fsp);
                 return;
         }
@@ -1740,6 +1802,9 @@ static void fc_io_compl(struct fc_fcp_pkt *fsp)
         struct fc_lport *lp;
         unsigned long flags;
 
+        /* release outstanding ddp context */
+        fc_fcp_ddp_done(fsp);
+
         fsp->state |= FC_SRB_COMPL;
         if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
                 spin_unlock_bh(&fsp->scsi_pkt_lock);