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