netdev - Re: [PATCH] net: reset gso header when the copied skb is linearized

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Date:	Tue, 26 Oct 2010 12:28:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fleitner@...hat.com
Cc:	netdev@...r.kernel.org, herbert@...dor.hengli.com.au
Subject: Re: [PATCH] net: reset gso header when the copied skb is linearized

From: Flavio Leitner <fleitner@...hat.com>
Date: Tue, 26 Oct 2010 17:25:11 -0200

> If I understand that correctly, the gso_segs is the number
> of GSO segments which are divided in non-linear way. When the
> copy is made using that function, the skb turns into a big
> one segment inlined. So, the idea of segments is lost and
> I'm not seeing how it is going to be divided again. 
> Later the NIC drives does, for example:

GSO has nothing to do with linearity, although it just so happens
to be that GSO packets tend to be non-linear due to the way
TCP builds such frames.

The GSO segment count is the number of MSS sized frames are
contained inside of a larger than MSS sized SKB.

That is it.  So the definition and meaning is independent of
linearity.

Thus, if we linearize a larger than MSS sized frame, it should still
have the same GSO attributes.
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