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

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Date:	Wed, 24 Mar 2010 06:53:42 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	Vasu Dev <vasu.dev@...el.com>
Subject: Re: [PATCH v2 1/2] vlan: adds vlan_dev_select_queue

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>

Thanks Jeff



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