netdev - Re: [PATCH RFC] tun: export underlying socket

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Message-ID: <15ddcffd0909150611s2e172f19xa8abe794abf13159@mail.gmail.com>
Date:	Tue, 15 Sep 2009 16:11:22 +0300
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Or Gerlitz <ogerlitz@...taire.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH RFC] tun: export underlying socket

On 9/14/09, Michael S. Tsirkin <mst@...hat.com> wrote:
>> 3. for tun fd
>> VM.TX is translated by vhost to sendmsg which is translated by tun to
>> netif_rx which is then handled by the bridge
>> NIC RX  goes to the bridge which xmits the packet a tun interface, now
>> what makes tun provide this packet to vhost and how it is done?

> Same as above. vhost polls tun and calls recvmsg on the socket

no, correct if I'm wrong, but recvmsg calls tun_do_read and the later
calls tun_put_user to the packet goes to user space and not into the virtq

Or.
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