netdev - UDP splice

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Date:	Fri, 21 Jun 2013 07:04:16 -0300
From:	Ricardo Landim <ricardolan@...il.com>
To:	netdev@...r.kernel.org
Subject: UDP splice

Hi folks,

I am developing a RTP proxy for voip applications and tried use the
splice syscall
for zero copy. I am trying splice udp data to pipe and splice pipe to udp
socket.

I read some information of the splice function and reading the kernel
source code I saw this lines in net/ipv4/af_inet.c

const struct proto_ops inet_stream_ops = {
...
    .splice_read = tcp_splice_read,
...
}

const struct proto_ops inet_dgram_ops = {
...
...
}

There is an implementation of splice for TCP socket but not for UDP socket.

My question is: there is some limitation in UDP socket that prevents this
implementation?

Regards,
Ricardo Landim
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