netdev - Re: [PATCH bpf-next v2 06/11] bpf, sockmap: Don't set up sockmap progs for listening sockets

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Date:   Mon, 13 Jan 2020 18:59:19 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        kernel-team@...udflare.com, Eric Dumazet <edumazet@...gle.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH bpf-next v2 06/11] bpf, sockmap: Don't set up sockmap progs for listening sockets

On Sun, Jan 12, 2020 at 02:07 AM CET, John Fastabend wrote:
> John Fastabend wrote:
>> Jakub Sitnicki wrote:
>> > Now that sockmap can hold listening sockets, when setting up the psock we
>> > will (i) grab references to verdict/parser progs, and (2) override socket
>> > upcalls sk_data_ready and sk_write_space.
>> >
>> > We cannot redirect to listening sockets so we don't need to link the socket
>> > to the BPF progs, but more importantly we don't want the listening socket
>> > to have overridden upcalls because they would get inherited by child
>> > sockets cloned from it.
>> >
>> > Introduce a separate initialization path for listening sockets that does
>> > not change the upcalls and ignores the BPF progs.
>> >
>> > Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
>> > ---
>> >  net/core/sock_map.c | 34 +++++++++++++++++++++++++++++++++-
>> >  1 file changed, 33 insertions(+), 1 deletion(-)
>>
>>
>> Any reason only support for sock_map types are added? We can also support
>> sock_hash I presume? Could be a follow up patch I guess but if its not
>> too much trouble would be worth adding now vs trying to detect at run
>> time later. I think it should be as simple as using similar logic as
>> below in sock_hash_update_common
>>
>> Thanks.
>
> After running through the other patches I think its probably OK to do hash
> support as a follow up. Up to you.

Yes, preferably. This series is already into double digits.