linux-kernel - Re: [PATCH V2 net-next 5/7] tun: support receiving skb through msg

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Message-ID: <571168f4-981d-4f2a-4211-9b42c696ff52@redhat.com>
Date:   Fri, 31 Mar 2017 12:10:11 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 net-next 5/7] tun: support receiving skb through
 msg_control

On 2017年03月30日 23:06, Michael S. Tsirkin wrote:
> On Thu, Mar 30, 2017 at 03:22:28PM +0800, Jason Wang wrote:
>> This patch makes tun_recvmsg() can receive from skb from its caller
>> through msg_control. Vhost_net will be the first user.
>>
>> Signed-off-by: Jason Wang<jasowang@...hat.com>
> Do we need to bother with tun? I didn't realize one
> can even use that with vhost. What would be the point of
> all the virtio header stuff dealing with checksums etc?
>
> Even if you see a use-case is it worth optimizing?
>
>

It's for tap in fact. I use "tun" just because we have already had a 
tap.c which is used by macvtap.

Thanks