netdev - Re: [PATCH v7] ethernet/arc/arc_emac

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Date:	Fri, 21 Jun 2013 10:53:47 +0000
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	Joe Perches <joe@...ches.com>
CC:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Mischa Jonker <Mischa.Jonker@...opsys.com>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	"Rob Herring" <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Florian Fainelli <florian@...nwrt.org>
Subject: Re: [PATCH v7] ethernet/arc/arc_emac - Add new driver

On 06/21/2013 02:32 PM, Joe Perches wrote:
> On Fri, 2013-06-21 at 11:20 +0400, Alexey Brodkin wrote:
>> Driver for non-standard on-chip ethernet device ARC EMAC 10/100,
>> instantiated in some legacy ARC (Synopsys) FPGA Boards such as
>> ARCAngel4/ML50x.
>
> Looks fine to me.
>
> One nit you could fix later and a question.
>
>> diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
> []
>> +static int arc_emac_rx(struct net_device *ndev, int budget)
>> +{
> []
>> +			if (net_ratelimit())
>> +				netdev_err(ndev, "incomplete packed received\n");
>
> s/packed/packet/

Ooops. Thanks for noticing this subtle misspelling.

>> +		rxbd->data = (unsigned char *)cpu_to_le32(rx_buff->skb->data);
>
> 32 bit only.  Should the Kconfig block have some arch_arc dependency
> so it can't get compiled for 64 bit systems?

Well, initially I add dependency on ARC in Kconfig.
But later removed it because in driver itself there're really no 
ARC-specific things. So why don't make it available for any other arch?
For example I re-used Xilinx SystemACE driver on ARC even though it was 
only targeted for PPC/Microblaze. And now I need to add another 
dependency (+ || ARC) in Kconfig for all block devices.

But your comment regarding 64-bit arches makes perfect sense. But still 
I don't know if there's a way to restrict usage on only 32-bit arches 
(independent of being x86/arc/mips/etc). I may suppose that only strict 
specification of all virtually supported 32-bit arches - which is 
nonsense I think.

Also independence of architecture makes it possible to compile driver on 
x86 for x86 with native toolchain. In other words anybody may try to 
compile it. And I thought it's if not mandatory but at least very 
welcome - if maintainer or reviewer may compile stuff and teach me how 
to eliminate all compile-time warnings/errors.

But during compilation on x86 one needs to enable OF. Which will lead to 
compilation errors in other things.

So for now I may easily add dependency on ARC if it makes acceptance of 
driver easier.

-Alexey
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