linux-kernel - Re: [RFC PATCH net-next] tun: support retrieving multiple packets in a single read with IFF_MULTI

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Message-ID: <20141222223436.GA25970@gondor.apana.org.au>
Date:	Tue, 23 Dec 2014 09:34:36 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Alex Gartrell <agartrell@...com>
Cc:	jasonwang@...hat.com, davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com,
	herbert@...dor.apena.org.au, kernel-team@...com
Subject: Re: [RFC PATCH net-next] tun: support retrieving multiple packets in
 a single read with IFF_MULTI_READ

On Mon, Dec 22, 2014 at 12:18:39PM -0800, Alex Gartrell wrote:
> 
> While fully aware that this makes me look like an idiot, I have to
> admit that I've tried and failed to figure out how to get a socket
> fd out of the tun device.

Well right now the socket is only used within the kernel by
vhost so it's not exported to user-space.  If we were to use
recvmmsg obviously we'd create a new interface based on sockets
for tun and expose the existing socket through that.

The current file-based tun interface was never designed to be
a high-performance interface.  So let's take this opportunity
and create a new interface (but still using the same underlying
code since whatever you create should be easily applicable to
the existing kernel user vhost).

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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