netdev - Re: [PATCHv11 bpf-next 2/5] xdp: add a new helper for dev map multicast support

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Date:   Wed, 9 Sep 2020 22:35:12 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Hangbin Liu <liuhangbin@...il.com>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCHv11 bpf-next 2/5] xdp: add a new helper for dev map
 multicast support

On Wed, Sep 9, 2020 at 8:30 PM David Ahern <dsahern@...il.com> wrote:
> >
> > I think the packets modification (edit dst mac, add vlan tag, etc) should be
> > done on egress, which rely on David's XDP egress support.
>
> agreed. The DEVMAP used for redirect can have programs attached that
> update the packet headers - assuming you want to update them.

Then you folks have to submit them as one set.
As-is the programmer cannot achieve correct behavior.