linux-kernel - Re: [PATCH] Gigabit Ethernet driver of Topcliff PCH

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Message-ID: <000601cb4b71$ee6adec0$66f8800a@maildom.okisemi.com>
Date:	Fri, 3 Sep 2010 23:11:35 +0900
From:	"Masayuki Ohtake" <masa-korg@....okisemi.com>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	"Stephen Hemminger" <shemminger@...tta.com>,
	"Sam Ravnborg" <sam@...nborg.org>, "Joe Perches" <joe@...ches.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"ML netdev" <netdev@...r.kernel.org>,
	"Greg Rose" <gregory.v.rose@...el.com>,
	"Maxime Bizon" <mbizon@...ebox.fr>,
	"Kristoffer Glembo" <kristoffer@...sler.com>,
	"Ralf Baechle" <ralf@...ux-mips.org>,
	"John Linn" <john.linn@...inx.com>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	"MeeGo" <meego-dev@...go.com>, "Wang, Qi" <qi.wang@...el.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>,
	"Andrew" <andrew.chih.howe.khor@...el.com>,
	"Intel OTC" <joel.clark@...el.com>,
	"Foster, Margie" <margie.foster@...el.com>,
	"Toshiharu Okada" <okada533@....okisemi.com>,
	"Tomoya Morinaga" <morinaga526@....okisemi.com>,
	"Takahiro Shimizu" <shimizu394@....okisemi.com>
Subject: Re: [PATCH] Gigabit Ethernet driver of Topcliff PCH

Hi Eric

Thank you for your information.
I will confirm other drivers.

Thanks, Ohtake(OKISemi)
----- Original Message ----- 
From: "Eric Dumazet" <eric.dumazet@...il.com>
To: "Masayuki Ohtake" <masa-korg@....okisemi.com>
Cc: "Stephen Hemminger" <shemminger@...tta.com>; "Sam Ravnborg" <sam@...nborg.org>; "Joe Perches" <joe@...ches.com>;
"LKML" <linux-kernel@...r.kernel.org>; "ML netdev" <netdev@...r.kernel.org>; "Greg Rose" <gregory.v.rose@...el.com>;
"Maxime Bizon" <mbizon@...ebox.fr>; "Kristoffer Glembo" <kristoffer@...sler.com>; "Ralf Baechle" <ralf@...ux-mips.org>;
"John Linn" <john.linn@...inx.com>; "Randy Dunlap" <randy.dunlap@...cle.com>; "David S. Miller" <davem@...emloft.net>;
"MeeGo" <meego-dev@...go.com>; "Wang, Qi" <qi.wang@...el.com>; "Wang, Yong Y" <yong.y.wang@...el.com>; "Andrew"
<andrew.chih.howe.khor@...el.com>; "Intel OTC" <joel.clark@...el.com>; "Foster, Margie" <margie.foster@...el.com>;
"Toshiharu Okada" <okada533@....okisemi.com>; "Tomoya Morinaga" <morinaga526@....okisemi.com>; "Takahiro Shimizu"
<shimizu394@....okisemi.com>
Sent: Friday, September 03, 2010 10:43 PM
Subject: Re: [PATCH] Gigabit Ethernet driver of Topcliff PCH


> Le vendredi 03 septembre 2010 a 22:32 +0900, Masayuki Ohtake a ecrit :
> > Hi Eric and Stephen
> >
> > Thank you for your suggestion.
> >
> > I tried modification of "dev->hard_header_len".
> > However, there was no changed to a format of SKB received by kernel.
> >   [Header:14octet] + [payload]
> >
> > So, I can not a single memcpy.
>
> Hmm, maybe you did this at the wrong place ?
>
> Take a look at other drivers how they do this
>
> (network stack default hard_header_len to 14, in net/ethernet/eth.c,
> function ether_setup())
>
>
> find drivers/net | xargs grep -n hard_header_len
>
> Example in drivers/net/wan/hdlc.c
>
> static void hdlc_setup_dev(struct net_device *dev)
> {
>         /* Re-init all variables changed by HDLC protocol drivers,
>          * including ether_setup() called from hdlc_raw_eth.c.
>          */
>         dev->flags               = IFF_POINTOPOINT | IFF_NOARP;
>         dev->priv_flags          = IFF_WAN_HDLC;
>         dev->mtu                 = HDLC_MAX_MTU;
>         dev->type                = ARPHRD_RAWHDLC;
>         dev->hard_header_len     = 16;
>         dev->addr_len            = 0;
>         dev->header_ops          = &hdlc_null_ops;
> }
>
>
>


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