netdev - Re: [PATCH net-next V2 13/16] net: fec: print more debug info in fec

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Message-ID: <56D9DCD2.2090009@boundarydevices.com>
Date:	Fri, 4 Mar 2016 12:06:58 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	Joe Perches <joe@...ches.com>, Fugang Duan <fugang.duan@....com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"b38611@...escale.com" <b38611@...escale.com>
Cc:	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>,
	"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"tremyfr@...il.com" <tremyfr@...il.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"laci@...ndarydevices.com" <laci@...ndarydevices.com>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>,
	"johannes@...solutions.net" <johannes@...solutions.net>,
	"stillcompiling@...il.com" <stillcompiling@...il.com>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH net-next V2 13/16] net: fec: print more debug info in
 fec_timeout

On 3/4/2016 10:35 AM, Joe Perches wrote:
> On Fri, 2016-03-04 at 09:05 -0700, Troy Kisky wrote:
>> On 3/4/2016 3:06 AM, Fugang Duan wrote:
>>> From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Thursday, February 25, 2016 8:37 AM
> []
>>>> Print the current interrupt flags and mask and the interrupt state during the last
>>>> interrupt in fec_timeout.
> []
>>>> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> []
>>>> @@ -1107,6 +1107,9 @@ fec_timeout(struct net_device *ndev)
>>>>  	int i;
>>>>  	uint events = 0;
>>>>
>>>> +	pr_err("%s: last=%x %x, mask %x\n", __func__, fep->last_ievents,
>>>> +	       readl(fep->hwp + FEC_IEVENT), readl(fep->hwp + FEC_IMASK));
>>>> +
>>> pr_err() -> netdev_err()
>> Sounds good
> 
> This seems like debugging information rather than
> an error a user can do anything with and if there's
> a timeout, how likely is it that the hardware is
> hosed and this would  repetitively and unnecessarily
> fill up logs?
> 
> So maybe netdev_dbg and net_ratelimit() too.
> 
> 	if (net_ratelimit()
> 		netdev_<level>(etc...)
> 
> 

This patch hasn't been helpful to me in quite a while. I'll just drop it.
I know where to get it if I need it again.


Thanks
Troy