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

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Message-ID: <5498AB99.6060900@fb.com>
Date:	Mon, 22 Dec 2014 15:39:05 -0800
From:	Alex Gartrell <agartrell@...com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
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

Hey Herbert,

On 12/22/2014 02:34 PM, Herbert Xu wrote:
> 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.

Ah, that explains it then.  I was afraid I was just going insane :)

> 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).

Sounds good to me. I'll get a patch turned around soon.

Thanks,
-- 
Alex Gartrell <agartrell@...com>
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