[SCSI] libfc: use lso_max for sequence offload
Make sure for large send is supported by LLD in outgoing FCP data, we are only
sending the lso_max a time in one single large send, since that is what
supported by LLD.
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index a070e57..48adb89 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -435,7 +435,13 @@
* 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 */