netdev - Re: pskb_copy() in tcp_transmit

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Message-ID: <4E6F2275.2050902@cn.fujitsu.com>
Date:	Tue, 13 Sep 2011 17:29:25 +0800
From:	Gaofeng <gaofeng@...fujitsu.com>
To:	christoph.paasch@...ouvain.be
CC:	netdev@...r.kernel.org
Subject: Re: pskb_copy() in tcp_transmit_skb()

  于 2011年09月13日 17:21, Christoph Paasch 写道:
> Hi,
>
> I'm trying to understand the reason for the possible call to pskb_copy() in
> tcp_transmit_skb().
> I don't find, where we may have a cloned skb entering tcp_transmit_skb().
>
> The original pskb_copy() came from tcp_retransmit_skb() (commit
> dfb4b9dceb35c567a595ae5e9d035cfda044a103).
> But from that point, the git-history does not show where the pskb_copy() is
> coming from.
>
>
> Does somebody has an idea, how a cloned skb can be passed to
> tcp_transmit_skb() and thus trigger this call to pskb_copy().
>
>
> Thanks for your help,
> Christoph
>
>
> --
> Christoph Paasch
> PhD Student
>
> IP Networking Lab --- http://inl.info.ucl.ac.be
> MultiPath TCP in the Linux Kernel --- http://inl.info.ucl.ac.be/mptcp
> Université Catholique de Louvain
>
> www.rollerbulls.be
> --
> --
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>
maybe nat,nat can change the tcp packet header
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