netdev - Re: [PATCH] bonding: reset queue mapping prior to transmission to physical device

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Message-ID: <20110603010403.GA2523@neilslaptop.think-freely.org>
Date:	Thu, 2 Jun 2011 21:04:04 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net
Subject: Re: [PATCH] bonding: reset queue mapping prior to transmission to
 physical device

On Thu, Jun 02, 2011 at 01:07:10PM -0700, David Miller wrote:
> From: Neil Horman <nhorman@...driver.com>
> Date: Thu,  2 Jun 2011 14:03:19 -0400
> 
> > The bonding driver is multiqueue enabled, in which each queue represents a slave
> > to enable optional steering of output frames to given slaves against the default
> > output policy.  However, it needs to reset the skb->queue_mapping prior to
> > queuing to the physical device or the physical slave (if it is multiqueue) could
> > wind up transmitting on an unintended tx queue (one that was reserved for
> > specific traffic classes for instance)
> > 
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> Since, as I mentioned, the idea when we are forwarding and bridging is that
> we use the input receive classification to influence the spread on transmit,
> I think things like this bonding case should remember the rxhash setting
> before they override it and then restore that value right before invoking
> dev_queue_xmit().
> 
Ok, I can respin the patch to do that.  I'll handle it in the AM.

Thanks
Neil

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