Compiling with MSCS results in the warning below:

../drivers/net/mlx5/mlx5_flow_dv.c(19636): warning C5287: operands are
different enum types 'ibv_flow_attr_type' and 'ibv_flow_flags'; use an explicit
cast to silence this warning

It looks like a legit bug. Here is the offending line:

        struct mlx5dv_flow_matcher_attr dv_attr = {
                .type = IBV_FLOW_ATTR_NORMAL | IBV_FLOW_ATTR_FLAGS_EGRESS,

As the warning states, the constants in the bitwise operation belong to
different enums, and these enums have overlaping values, which makes the
bitwise operation very suspicious.
On top of that, I see that struct mlx5dv_flow_matcher_attr has a field named
"flags" which accepts values from ibv_flow_flags:

        struct mlx5dv_flow_matcher_attr {
                enum ibv_flow_attr_type type;
                uint32_t flags; /* From enum ibv_flow_flags. */