MLX5_IB_SEND_UMR_UNREG
umrwr->wr.send_flags = MLX5_IB_SEND_UMR_UNREG | MLX5_IB_SEND_UMR_FAIL_IF_FREE;
if (!(wr->send_flags & MLX5_IB_SEND_UMR_UNREG)) {
if (wr->send_flags & MLX5_IB_SEND_UMR_UNREG) {