From: "Toke Høiland-Jørgensen" <toke@redhat•com>
To: Jesper Dangaard Brouer <brouer@redhat•com>, bpf@vger•kernel.org
Cc: Jesper Dangaard Brouer <brouer@redhat•com>,
netdev@vger•kernel.org, Stanislav Fomichev <sdf@google•com>,
martin.lau@kernel•org, ast@kernel•org, daniel@iogearbox•net,
alexandr.lobakin@intel•com, larysa.zaremba@intel•com,
xdp-hints@xdp-project•net, anthony.l.nguyen@intel•com,
yoong.siang.song@intel•com, boon.leong.ong@intel•com,
intel-wired-lan@lists•osuosl.org, pabeni@redhat•com,
jesse.brandeburg@intel•com, kuba@kernel•org, edumazet@google•com,
john.fastabend@gmail•com, hawk@kernel•org, davem@davemloft•net
Subject: Re: [xdp-hints] [PATCH bpf V2] xdp: bpf_xdp_metadata use EOPNOTSUPP for no driver support
Date: Tue, 21 Mar 2023 20:20:56 +0100 [thread overview]
Message-ID: <87ttyd7vxj.fsf@toke.dk> (raw)
In-Reply-To: <167940675120.2718408.8176058626864184420.stgit@firesoul>
Jesper Dangaard Brouer <brouer@redhat•com> 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@redhat•com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat•com>
next prev parent reply other threads:[~2023-03-21 19:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-21 13:52 [PATCH bpf V2] xdp: bpf_xdp_metadata use EOPNOTSUPP for no driver support Jesper Dangaard Brouer
2023-03-21 18:41 ` Stanislav Fomichev
2023-03-21 19:20 ` Toke Høiland-Jørgensen [this message]
2023-03-21 20:43 ` Tariq Toukan
2023-03-22 18:34 ` Alexei Starovoitov
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