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From: David Miller <davem@davemloft.net>
Subject: Re: Bug in computing data_len in tcp_sendmsg?
Date: Wed, 30 Nov 2011 23:16:59 -0500 (EST)
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From: Tom Herbert <therbert@google.com>
Date: Wed, 30 Nov 2011 20:06:09 -0800

> Actually, I think I am misinterpreting the meaning of data_len, looks
> like it is intended to return the number of bytes in the page buffer
> area

skb->len is all bytes, skb->data_len covers only segmented portion.

> (comment on the function would be have been nice ;-) ).

Patches welcome, otherwise:

http://vger.kernel.org/~davem/skb.html