netdev - Re: [PATCH net] datagram: When peeking datagrams with offset

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Message-ID: <CAF=yD-K4HgOhMMT0tWycZgcqhU5OACQk_roPQEeRems1_Azhgw@mail.gmail.com>
Date:   Mon, 14 Aug 2017 15:03:16 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Thiago Macieira <thiago.macieira@...el.com>
Cc:     Matthew Dawson <matthew@...systems.ca>,
        Paolo Abeni <pabeni@...hat.com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net] datagram: When peeking datagrams with offset < 0
 don't skip empty skbs

On Mon, Aug 14, 2017 at 2:58 PM, Thiago Macieira
<thiago.macieira@...el.com> wrote:
> On Monday, 14 August 2017 11:46:42 PDT Willem de Bruijn wrote:
>> > By the way, what were the usecases for the peek offset feature?
>>
>> The idea was to be able to peek at application headers of upper
>> layer protocols and multiplex messages among threads. It proved
>> so complex even for UDP that we did not attempt the same feature
>> for TCP. Also, KCM implements demultiplexing using eBPF today.
>
> Interesting, but how would userspace coordinate like that? Suppose multiple
> threads are woken up by a datagram being received

This assumes a separate listener thread and worker threadpool.