From 72d8a013d75fc845a34451bdce3d3a3dd97488f1 Mon Sep 17 00:00:00 2001
From: Naga Irrinki <naga.irrinki@avagotech.com>
Date: Tue, 19 May 2015 11:32:39 +0530
Subject: RDMA/ocrdma: Fail connection for MTU lesser than 512

HW currently restricts the IB MTU range between 512 and 4096.
Fail connection for MTUs lesser than 512.

Signed-off-by: Naga Irrinki <naga.irrinki@avagotech.com>
Signed-off-by: Selvin Xavier <selvin.xavier@avagotech.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index ac7347a..47615ff 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -2534,8 +2534,10 @@ static int ocrdma_set_qp_params(struct ocrdma_qp *qp,
 		cmd->flags |= OCRDMA_QP_PARA_DST_QPN_VALID;
 	}
 	if (attr_mask & IB_QP_PATH_MTU) {
-		if (attrs->path_mtu < IB_MTU_256 ||
+		if (attrs->path_mtu < IB_MTU_512 ||
 		    attrs->path_mtu > IB_MTU_4096) {
+			pr_err("ocrdma%d: IB MTU %d is not supported\n",
+			       dev->id, ib_mtu_enum_to_int(attrs->path_mtu));
 			status = -EINVAL;
 			goto pmtu_err;
 		}
-- 
cgit v0.10.2