netdev - Re: [net-next 2/2] macvlan: Enable qdisc backoff logic.

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Date:	Thu, 26 Aug 2010 15:55:35 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [net-next 2/2] macvlan:  Enable qdisc backoff logic.

On Wednesday 25 August 2010, Ben Greear wrote:
> On 08/25/2010 12:59 PM, Arnd Bergmann wrote:
> > On Wednesday 25 August 2010 21:27:43 Ben Greear wrote:
> >>> I suppose we need to do something in macvtap to handle this as
> >>> well, right? A guest trying to send a frame through qemu
> >>> or vhost net into macvtap needs to be prevented from sending
> >>> more when we get into this path. Right now, we just ignore
> >>> the return value of macvlan_start_xmit.
> >>
> >> I have a similar, though slightly more complex, patch for 802.1q
> >> vlans, but I haven't looked at macvtap at all.
> >>
> >> If these two patches are accepted, I'll post the .1q patch as well.
> >
> > I think one of us needs to fix macvtap in order for your patch to
> > go in, because otherwise there is a memory leak or worse when
> > macvtap fails to retransmit the frame.
> 
> With no change, the try_ logic will not be called, so it should
> be fully backwards compatible.

How? The macvlan driver is used as the back-end for macvtap,
so it calls all the same functions:

macvtap_write
-> macvtap_get_user
-> macvlan_start_xmit
-> macvlan->queue_xmit
-> try_dev_queue_xmit

	Arnd
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