netdev - Re: [PATCH net-2.6] net_sched: always clone skbs

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Message-ID: <AANLkTikwMQBwNdT1nZ97NNFYGJnwhk39+8afTKONgeF5@mail.gmail.com>
Date:	Tue, 21 Dec 2010 22:17:35 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	hadi@...erus.ca
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Pawel Staszewski <pstaszewski@...are.pl>
Subject: Re: [PATCH net-2.6] net_sched: always clone skbs

On Tue, Dec 21, 2010 at 9:52 PM, jamal <hadi@...erus.ca> wrote:
>
> Use to be we couldnt get the ifb+mirred combo to work
> with TSO even without this change - i will have to dig old emails
> to remember details. So we are making progress;-> I did write a set
> of rules in: Documentation/networking/tc-actions-env-rules.txt
> Changli optimized rule #1. When i looked at his patch it seems
> to not harm that case. Sometimes dumb is a good principle ;->
>

In order to make my trick work. We need to assure dev_queue_xmit() and
dev_hard_start_xmit() accept shared skbs. As Eric pointed, pktgen also
need dev->netdev_ops->ndo_start_xmit() accept shared skbs. We need to
fix every ndo_start_xmit() one by one, then dev_hard_start_xmit(), and
when dev_queue_xmit() is also fixed, my trick can be added back.
:)

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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