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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <553821F8.8050300@cogentembedded.com>
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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html