netdev - Re: [PATCH bpf-next v5 07/17] bpf: XDP metadata RX kfuncs

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Date:   Tue, 3 Jan 2023 14:23:59 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     David Vernet <void@...ifault.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: [PATCH bpf-next v5 07/17] bpf: XDP metadata RX kfuncs

On Tue, Dec 27, 2022 at 12:33 PM David Vernet <void@...ifault.com> wrote:
>
> On Tue, Dec 20, 2022 at 02:20:33PM -0800, Stanislav Fomichev wrote:
>
> Hey Stanislav,
>
> [...]
>
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index aad12a179e54..b41d18490595 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -74,6 +74,7 @@ struct udp_tunnel_nic_info;
> >  struct udp_tunnel_nic;
> >  struct bpf_prog;
> >  struct xdp_buff;
> > +struct xdp_md;
> >
> >  void synchronize_net(void);
> >  void netdev_set_default_ethtool_ops(struct net_device *dev,
> > @@ -1618,6 +1619,11 @@ struct net_device_ops {
> >                                                 bool cycles);
> >  };
> >
> > +struct xdp_metadata_ops {
> > +     int     (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
> > +     int     (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash);
> > +};
> > +
> >  /**
> >   * enum netdev_priv_flags - &struct net_device priv_flags
> >   *
> > @@ -2050,6 +2056,7 @@ struct net_device {
> >       unsigned int            flags;
> >       unsigned long long      priv_flags;
> >       const struct net_device_ops *netdev_ops;
> > +     const struct xdp_metadata_ops *xdp_metadata_ops;
>
> You need to document this field above the struct, or the docs build will
> complain:
>
>   SPHINX  htmldocs -->
>   <redacted>
>   make[2]: Nothing to be done for 'html'.
>   Using sphinx_rtd_theme theme
>   source directory: networking
>   ./include/linux/netdevice.h:2371: warning: Function parameter or
>   member 'xdp_metadata_ops' not described in 'net_device'
>
> >       int                     ifindex;
> >       unsigned short          gflags;
> >       unsigned short          hard_header_len;

Thanks, I will try to actually build the doc. Last time I tried it
took too long and I gave up :-)

> Thanks,
> David