linux-kernel - Re: [PATCH v4] ethernet/arc/arc_emac

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Date:	Sat, 15 Jun 2013 20:47:25 +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>
Subject: Re: [PATCH v4] ethernet/arc/arc_emac - Add new driver

On 06/16/2013 12:37 AM, Joe Perches wrote:
> On Sun, 2013-06-16 at 00:20 +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.
>
>> diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
> []
>> +		if (DUPLEX_FULL == phy_dev->duplex)
>
> Most all kernel code uses "if (var == constant)"
> as that's how most people think.

Makes sense.

> []
>
>> +static int arc_emac_rx(struct net_device *ndev, int budget)
> []
>> +		/* Prepare the BD for next cycle */
>> +		rx_buff->skb = netdev_alloc_skb_ip_align(ndev, buflen);
>> +		if (unlikely(!rx_buff->skb)) {
>> +			if (net_ratelimit())
>> +				netdev_err(ndev, "cannot allocate skb\n");
>
> Unnecessary OOM message, might as well remove it.
> rx_dropped gives the same info.

With all those error messages I wanted to make life easier (especially 
for me) if errors appear. User will immediately know where problem 
happened. Indeed "rx_dropped" (when it is used only once in driver) may 
show where issue happened, but if later at some point "rx_dropped" will 
be incremented in other locations then user won't understand immediately 
where error happened.

-Alexey
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