netdev - Re: [PATCH bpf-next 04/16] net: Add BPF_XDP_EGRESS as a bpf_attach

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Message-ID: <856a263f-3bde-70a7-ff89-5baaf8e2240e@gmail.com>
Date:   Tue, 21 Apr 2020 06:50:48 -0600
From:   David Ahern <dsahern@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        prashantbhole.linux@...il.com, jasowang@...hat.com,
        brouer@...hat.com, toshiaki.makita1@...il.com,
        daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com, andriin@...com,
        David Ahern <dahern@...italocean.com>
Subject: Re: [PATCH bpf-next 04/16] net: Add BPF_XDP_EGRESS as a
 bpf_attach_type

On 4/21/20 4:14 AM, Toke Høiland-Jørgensen wrote:
> As I pointed out on the RFC patch, I'm concerned whether this will work
> right with freplace programs attaching to XDP programs. It may just be
> that I'm missing something, but in that case please explain why it
> works? :)

expected_attach_type is not unique to XDP. freplace is not unique to
XDP. IF there is a problem, it is not unique to XDP, and any
enhancements needed to freplace functionality will not be unique to XDP.