netdev - Re: [PATCH nf-next] netfilter: nf

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Date:   Tue, 6 Sep 2022 20:04:11 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     Florian Westphal <fw@...len.de>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...nel.org>,
        netfilter-devel <netfilter-devel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH nf-next] netfilter: nf_tables: add ebpf expression

On Mon, Sep 5, 2022 at 11:57 PM Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
>
>
> Le 31/08/2022 à 23:57, Florian Westphal a écrit :
> > Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> >>> This helps gradually moving towards move epbf for those that
> >>> still heavily rely on the classic forwarding path.
> >>
> >> No one is using it.
> >> If it was, we would have seen at least one bug report over
> >> all these years. We've seen none.
> >
> > Err, it IS used, else I would not have sent this patch.
> >
> >> very reasonable early on and turned out to be useless with
> >> zero users.
> >> BPF_PROG_TYPE_SCHED_ACT and BPF_PROG_TYPE_LWT*
> >> are in this category.
> >
> > I doubt it had 0 users.  Those users probably moved to something
> > better?
> We are using BPF_PROG_TYPE_SCHED_ACT to perform custom encapsulations.
> What could we used to replace that?

SCHED_CLS. It has all of the features of cls and act combined.