linux-kernel - Re: [PATCH 0/2] NET: Multiple queue network device support REPOST

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Message-Id: <20070308.231142.74749203.davem@davemloft.net>
Date:	Thu, 08 Mar 2007 23:11:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	peter.p.waskiewicz.jr@...el.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	christopher.leech@...el.com
Subject: Re: [PATCH 0/2] NET: Multiple queue network device support REPOST

From: "Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Date: Thu, 8 Mar 2007 22:42:19 -0800

> This was taken into consideration, and I did reply that my concern for
> doing that could cause stale data in the skb if the queue mapping
> changed.

This is not a problem.

Since the ->enqueue function stores references to the SKBs,
any change of the dev->qdisc has to flush those references
somehow, and it is at that point that you can fixup the
skb queue mappings.

This happens via invoking the qdisc->ops->reset() method.
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