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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH]NET: Add ECN support for TSO
Date: Tue, 11 Jul 2006 23:11:49 -0700 (PDT)
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From: "Michael Chan" <mchan@broadcom.com>
Date: Tue, 11 Jul 2006 21:53:42 -0700

> There is no reason to find out if ECN is enabled or not for any
> TCP connections.  Hw just needs to watch the above bits in the
> incoming packets.

Correct, it can be done in a completely stateless manner.