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

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Date:	Thu, 23 Apr 2015 01:34:32 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Miller <davem@...emloft.net>
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

On 04/23/2015 01:18 AM, 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.

    Sigh... I'm seeing no way out of that then, only copying. :-(

WBR, Sergei

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