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 <[email protected]>
Signed-off-by: Selvin Xavier <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index ac7347ad90be5c7f87e08afae0199104a04ad2f8..47615ff33bc6a1fb8c0c703b9f975acc6afe79c2 100644 (file)
--- 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;
                }