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

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Message-ID: <553808BC.5020600@cogentembedded.com>
Date:	Wed, 22 Apr 2015 23:46:52 +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

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?
If so, there should be no problem with removing the copy.

WBR, Segei

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