scsi: target: iscsi: cxgbit: fix max iso npdu calculation

- rounddown CXGBIT_MAX_ISO_PAYLOAD by csk->emss before calculating
  max_iso_npdu to get max TCP payload in multiple of mss.

- call cxgbit_set_digest() before cxgbit_set_iso_npdu() to set
  csk->submode, it is used in calculating number of iso pdus.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/target/iscsi/cxgbit/cxgbit_target.c b/drivers/target/iscsi/cxgbit/cxgbit_target.c
index 514986b57c2d..25eb3891e34b 100644
--- a/drivers/target/iscsi/cxgbit/cxgbit_target.c
+++ b/drivers/target/iscsi/cxgbit/cxgbit_target.c
@@ -652,6 +652,7 @@ static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
         struct iscsi_param *param;
         u32 mrdsl, mbl;
         u32 max_npdu, max_iso_npdu;
+        u32 max_iso_payload;
 
         if (conn->login->leading_connection) {
                 param = iscsi_find_param_from_key(MAXBURSTLENGTH,
@@ -670,8 +671,10 @@ static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
         mrdsl = conn_ops->MaxRecvDataSegmentLength;
         max_npdu = mbl / mrdsl;
 
-        max_iso_npdu = CXGBIT_MAX_ISO_PAYLOAD /
-                        (ISCSI_HDR_LEN + mrdsl +
+        max_iso_payload = rounddown(CXGBIT_MAX_ISO_PAYLOAD, csk->emss);
+
+        max_iso_npdu = max_iso_payload /
+                       (ISCSI_HDR_LEN + mrdsl +
                         cxgbit_digest_len[csk->submode]);
 
         csk->max_iso_npdu = min(max_npdu, max_iso_npdu);
@@ -741,6 +744,9 @@ static int cxgbit_set_params(struct iscsi_conn *conn)
         if (conn_ops->MaxRecvDataSegmentLength > cdev->mdsl)
                 conn_ops->MaxRecvDataSegmentLength = cdev->mdsl;
 
+        if (cxgbit_set_digest(csk))
+                return -1;
+
         if (conn->login->leading_connection) {
                 param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL,
                                                   conn->param_list);
@@ -764,7 +770,7 @@ static int cxgbit_set_params(struct iscsi_conn *conn)
                         if (is_t5(cdev->lldi.adapter_type))
                                 goto enable_ddp;
                         else
-                                goto enable_digest;
+                                return 0;
                 }
 
                 if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
@@ -781,10 +787,6 @@ enable_ddp:
                 }
         }
 
-enable_digest:
-        if (cxgbit_set_digest(csk))
-                return -1;
-
         return 0;
 }