Jesper Dangaard Brouer <brouer@xxxxxxxxxx> writes:
> When driver doesn't implement a bpf_xdp_metadata kfunc the fallback
> implementation returns EOPNOTSUPP, which indicate device driver doesn't
> implement this kfunc.
>
> Currently many drivers also return EOPNOTSUPP when the hint isn't
> available, which is ambiguous from an API point of view. Instead
> change drivers to return ENODATA in these cases.
>
> There can be natural cases why a driver doesn't provide any hardware
> info for a specific hint, even on a frame to frame basis (e.g. PTP).
> Lets keep these cases as separate return codes.
>
> When describing the return values, adjust the function kernel-doc layout
> to get proper rendering for the return values.
>
> Fixes: ab46182d0dcb ("net/mlx4_en: Support RX XDP metadata")
> Fixes: bc8d405b1ba9 ("net/mlx5e: Support RX XDP metadata")
> Fixes: 306531f0249f ("veth: Support RX XDP metadata")
> Fixes: 3d76a4d3d4e5 ("bpf: XDP metadata RX kfuncs")
> Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
