netdev - Re: [PATCH v2 1/2] vlan: adds vlan_dev_select

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Date:	Wed, 24 Mar 2010 11:11:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	gospo@...hat.com, vasu.dev@...el.com
Subject: Re: [PATCH v2 1/2] vlan: adds vlan_dev_select_queue

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 24 Mar 2010 06:53:42 +0100

> Le mardi 23 mars 2010 à 17:41 -0700, Jeff Kirsher a écrit :
>> From: Vasu Dev <vasu.dev@...el.com>
>> 
>> This is required to correctly select vlan tx queue for a driver
>> supporting multi tx queue with ndo_select_queue implemented since
>> currently selected vlan tx queue is unaligned to selected queue by
>> real net_devce ndo_select_queue.
>> 
>> Unaligned vlan tx queue selection causes thrash with higher vlan
>> tx lock contention for least fcoe traffic and wrong socket tx
>> queue_mapping for ixgbe having ndo_select_queue implemented.
>> 
>> -v2
>> 
>> As per Eric Dumazet<eric.dumazet@...il.com> comments, mirrored
>> vlan net_device_ops to have them with and without vlan_dev_select_queue
>> and then select according to real dev ndo_select_queue present or not
>> for a vlan net_device. This is to completely skip vlan_dev_select_queue
>> calling for real net_device not supporting ndo_select_queue.
>> 
>> Signed-off-by: Vasu Dev <vasu.dev@...el.com>
>> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>> ---
>> 
> 
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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