netdev - Re: [PATCH bpf-next 2/3] bpf: expose information about supported xdp metadata kfunc

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Message-ID: <CAKH8qBv78jTrktfThFK=Ze12tjgAsgYXyNaRy-3m8QE8J-xwuQ@mail.gmail.com>
Date: Mon, 11 Sep 2023 15:48:10 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net, 
	andrii@...nel.org, song@...nel.org, yhs@...com, john.fastabend@...il.com, 
	kpsingh@...nel.org, haoluo@...gle.com, jolsa@...nel.org, 
	netdev@...r.kernel.org, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next 2/3] bpf: expose information about supported xdp
 metadata kfunc

On Mon, Sep 11, 2023 at 3:11 PM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 9/8/23 3:58 PM, Stanislav Fomichev wrote:
> > @@ -12,15 +13,24 @@ static int
> >   netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
> >                  const struct genl_info *info)
> >   {
> > +     u64 xdp_rx_meta = 0;
> >       void *hdr;
> >
> >       hdr = genlmsg_iput(rsp, info);
> >       if (!hdr)
> >               return -EMSGSIZE;
> >
> > +#define XDP_METADATA_KFUNC(_, flag, __, xmo) \
> > +     if (netdev->xdp_metadata_ops->xmo) \
>
> A NULL check is needed for netdev->xdp_metadata_ops.

Oh, sure, will add, thanks!

> > +             xdp_rx_meta |= flag;
> > +XDP_METADATA_KFUNC_xxx
> > +#undef XDP_METADATA_KFUNC
> > +
>