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

Alex Gartrell
2014-12-22T23:41:06Z

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@fb.com>