netdev - RFC: zero copy recv()

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Message-ID: <CAD8XO3atijveUR0irCM2z3hsr8Rm9piwTbBp0NTwvzJt9+MHdw@mail.gmail.com>
Date:   Wed, 24 Apr 2019 09:23:00 +0300
From:   Maxim Uvarov <maxim.uvarov@...aro.org>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RFC: zero copy recv()

Hello,

On different conferences I see that people are trying to accelerate
network with putting packet processing with protocol level completely
to user space. It might be DPDK, ODP or AF_XDP  plus some network
stack on top of it. Then people are trying to test this solution with
some existence applications. And in better way do not modify
application binaries and just LD_PRELOAD sockets syscalls (recv(),
sendto() and etc). Current recv() expects that application allocates
memory and call will "copy" packet to that memory. Copy per packet is
slow.  Can we consider about implementing zero copy API calls
friendly? Can this change be accepted to kernel?

What are your thoughts?

Thank you,
Maxim.