bnx2x: allow user to change ring size in ISCSI SD mode

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 2b731b2..03f3935 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -3117,7 +3117,7 @@
 	int rx_ring_size = 0;
 
 #ifdef BCM_CNIC
-	if (IS_MF_ISCSI_SD(bp)) {
+	if (!bp->rx_ring_size && IS_MF_ISCSI_SD(bp)) {
 		rx_ring_size = MIN_RX_SIZE_NONTPA;
 		bp->rx_ring_size = rx_ring_size;
 	} else