From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3] Renesas Ethernet AVB driver
Date: Wed, 22 Apr 2015 18:17:28 -0400 (EDT)
Message-ID: <20150422.181728.1904622458656373346.davem@davemloft.net>
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Cc: mitsuhiro.kimura.kc@renesas.com, f.fainelli@gmail.com, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, devicetree@vger.kernel.org, galak@codeaurora.org, netdev@vger.kernel.org, richardcochran@gmail.com, linux-sh@vger.kernel.org, masaru.nagai.vx@renesas.com
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From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Wed, 22 Apr 2015 23:46:52 +0300

> Hello.
> 
> On 04/22/2015 11:42 PM, David Miller wrote:
> 
>>>     Hmm, I've been digging in the net core, and was unable to see where TX
>>>     skb's get their NET_IP_ALIGN bytes reserved. Have I missed something?
>>>     Probably need to print out skb's fields...
> 
>> NET_IP_ALIGN is for receive, not transmit.
> 
>    Hm, then 'skb->data' should be aligned to 4 byte boundary on TX,
>    right?

Yes, TCP even take great pains to ensure this.