netdev - Re: [PATCH v3] Renesas Ethernet AVB driver

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Date:	Wed, 22 Apr 2015 18:18:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sergei.shtylyov@...entembedded.com
Cc:	mitsuhiro.kimura.kc@...esas.com, f.fainelli@...il.com,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, devicetree@...r.kernel.org,
	galak@...eaurora.org, netdev@...r.kernel.org,
	richardcochran@...il.com, linux-sh@...r.kernel.org,
	masaru.nagai.vx@...esas.com
Subject: Re: [PATCH v3] Renesas Ethernet AVB driver

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Date: Thu, 23 Apr 2015 00:38:56 +0300

> 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.
> 
>    But when I print 'skb->data' from the ndo_start_xmit() method (in the
>    'sh_eth' driver), all addresses end with 2, so it looks like
>    NET_IP_ALIGN gets added somewhere...

It's the IPV4 header which is 4 byte aligned, then the ethernet header
is pushed which is 14 bytes.
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