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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index ac7347ad90be..47615ff33bc6 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;
                 }