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

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Message-Id: <20110602.130710.1904222486883754792.davem@davemloft.net>
Date:	Thu, 02 Jun 2011 13:07:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net
Subject: Re: [PATCH] bonding: reset queue mapping prior to transmission to
 physical device

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().
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