netdev - Re: [PATCH v5 bpf-next 00/11] net: Add support for XDP in egress path

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Date:   Sun, 17 May 2020 21:40:28 -0600
From:   David Ahern <dsahern@...il.com>
To:     John Fastabend <john.fastabend@...il.com>,
        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, brouer@...hat.com,
        daniel@...earbox.net, ast@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com,
        David Ahern <dahern@...italocean.com>
Subject: Re: [PATCH v5 bpf-next 00/11] net: Add support for XDP in egress path

I am trying to understand the resistance here. There are ingress/egress
hooks for most of the layers - tc, netfilter, and even within bpf APIs.
Clearly there is a need for this kind of symmetry across the APIs, so
why the resistance or hesitation for XDP?

Stacking programs on the Rx side into the host was brought up 9
revisions ago when the first patches went out. It makes for an
unnecessarily complicated design and is antithetical to the whole
Unix/Linux philosophy of small focused programs linked together to
provide a solution.

Can you elaborate on your concerns?