netdev - Re: [RFC PATCH 07/10] ixgbe: Add function for setting XPS queue mapping

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Date:	Wed, 11 Jul 2012 14:12:57 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	jeffrey.t.kirsher@...el.com, edumazet@...gle.com,
	therbert@...gle.com, alexander.duyck@...il.com
Subject: Re: [RFC PATCH 07/10] ixgbe: Add function for setting XPS queue mapping

On 07/11/2012 11:15 AM, Ben Hutchings wrote:
> On Fri, 2012-06-29 at 17:16 -0700, Alexander Duyck wrote:
>> This change adds support for ixgbe to configure the XPS queue mapping on
>> load.  The result of this change is that on open we will now be resetting
>> the number of Tx queues, and then setting the default configuration for XPS
>> based on if ATR is enabled or disabled.
> [...]
>
> I didn't see where you're resetting the number of TX queues; was that
> actually added in an earlier patch?
>
> It seems strange to be resetting XPS configuration on open; normally net
> device configuration persists as long as the device is registered.
> Maybe only do this if the number of TX queues has to change?
>
> Ben.
>
Actually I am working on top of a set of patches for ixgbe that haven't
been submitted upstream.  In one of those patches I moved our call to
netif_set_real_num_tx_queues into ixgbe_open.  The call is only one or
two lines above the call I make to ixgbe_set_xps_mapping.

I will see what I can do about resetting the settings only when we
change the number of queues.

Thanks,

Alex


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