netdev - Re: [xdp-hints] Re: [PATCH bpf-next v2 2/8] bpf: XDP metadata RX kfuncs

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Date:   Mon, 28 Nov 2022 23:10:10 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org
Subject: Re: [xdp-hints] Re: [PATCH bpf-next v2 2/8] bpf: XDP metadata RX
 kfuncs

Stanislav Fomichev <sdf@...gle.com> writes:

>  s
>
> On Fri, Nov 25, 2022 at 9:53 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>>
>> Stanislav Fomichev <sdf@...gle.com> writes:
>>
>> > There is an ndo handler per kfunc, the verifier replaces a call to the
>> > generic kfunc with a call to the per-device one.
>> >
>> > For XDP, we define a new kfunc set (xdp_metadata_kfunc_ids) which
>> > implements all possible metatada kfuncs. Not all devices have to
>> > implement them. If kfunc is not supported by the target device,
>> > the default implementation is called instead.
>>
>> BTW, this "the default implementation is called instead" bit is not
>> included in this version... :)
>
> fixup_xdp_kfunc_call should return 0 when the device doesn't have a
> kfunc defined and should fallback to the default kfunc implementation,
> right?
> Or am I missing something?

Ohh, right. Maybe add a comment stating this (as I obviously missed it :))

-Toke