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

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Date:	Thu, 02 Jun 2011 21:51:46 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	nicolas.2p.debian@...il.com, nhorman@...driver.com,
	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, 2011-06-02 at 13:46 -0700, David Miller wrote:
> From: Nicolas de Pesloüan <nicolas.2p.debian@...il.com>
> Date: Thu, 02 Jun 2011 22:13:57 +0200
> 
> > To be more precise, due to the way bonding use queue mapping for slave
> > selection, it is desirable to clear the mapping before sending to the
> > slave, because the meaning of the mapping for the slave interface
> > might be really different from the meaning for the bonding
> > interface. Arguably, this is the mapping usage in bonding which is
> > "different" from other usages, but...
> 
> This just confirms my reasoning behind why I wanted to discourage
> drivers from providing explicit ->ndo_select_queue() methods unless
> absolutely necessary.
> 
> Information now gets lost in cases like this bonding issue.
> 
> Bonding should definitely, as I suggested, remember the original
> rxhash value and restore it when sending to the slave.

Surely RX queue (queue_mapping), not RX hash (rxhash, which is unchanged
anyway AFAIK).

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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