netdev - Re: [RFC PATCH] fix IP_ECN_set

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Date:	Wed, 19 Dec 2012 08:14:35 -0800
From:	Eric Dumazet <erdnetdev@...il.com>
To:	roy.qing.li@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] fix IP_ECN_set_ce

On Wed, 2012-12-19 at 14:21 +0800, roy.qing.li@...il.com wrote:
> From: Li RongQing <roy.qing.li@...il.com>
> 
> 1. ECN uses the two least significant (right-most) bits of the DiffServ
> field in the IPv4, so it should be in iph->tos, not in (iph->tos+1)
> 
> 2. When setting CE, we should check if ECN Capable Transport supports,
> both 10 and 01 mean ECN Capable Transport, so only check 10 is not enough
>     00: Non ECN-Capable Transport — Non-ECT
>     10: ECN Capable Transport — ECT(0)
>     01: ECN Capable Transport — ECT(1)
>     11: Congestion Encountered — CE
> 
> 3. Remove the misunderstand comment
> 
> 4. fix the checksum computation
> 
> Signed-off-by: Li RongQing <roy.qing.li@...il.com>

This is total crap.

Its perfectly clear to me and compiler generates fast code.

If you don't understand this code, please don't touch it.




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