netdev - make sendmsg/recvmsg process multiple messages at once

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Message-ID: <CADxym3ba8R6fN3O5zLAw-e7q0gjFxBd_WUKjq0hTP+JpAbJEKg@mail.gmail.com>
Date:   Mon, 1 Feb 2021 20:41:45 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>
Subject: make sendmsg/recvmsg process multiple messages at once

Hello, guys!

I am thinking about making sendmsg/recvmsg process multiple messages
at once, which is possible to reduce the number of system calls.

Take the receiving of udp as an example, we can copy multiple skbs to
msg_iov and make sure that every iovec contains a udp package.

Is this a good idea? This idea seems clumsy compared to the incoming
'io-uring' based zerocopy, but maybe it can help...

Regards
Menglong Dong