linux-kernel - Re: [PATCH] bcm63xx_enet: fix poll callback.

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Date:	Tue, 03 Mar 2015 15:43:28 +0100
From:	Nicolas Schichan <nschichan@...ebox.fr>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Tobias Klauser <tklauser@...tanz.ch>,
	Felipe Balbi <balbi@...com>,
	Wilfried Klaebe <w-lkml@...enslange-mailadresse.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexander Duyck <alexander.h.duyck@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bcm63xx_enet: fix poll callback.

On 03/03/2015 03:18 PM, Eric Dumazet wrote:
> On Tue, 2015-03-03 at 14:53 +0100, Nicolas Schichan wrote:
>> On 03/03/2015 02:42 PM, Eric Dumazet wrote:
>>>> To avoid that, I would take priv->tx_lock only once, or add a limit on
>>>> the number of skbs that can be drained per round.
>>>
>>> Something like this (untested) patch
>>
>> I'm not against testing this patch, but we do not have any SMP capable bcm63xx
>> board here so I don't think it will be of any use.
>>
>> bcm6358 and bcm6368 do indeed have two MIPS threads, but SMP is not possible
>> (due to a data cache or TLB shared across all MIPS threads , unbearably
>> complicating things, IIRC).
>>
>> bcm63xx ARM SoCs look like they can support SMP though.
>>
>> Regards,
>>
> 
> I am reasonably confident the patch is OK, but I cannot easily compile
> it on my laptop (x86_64) :

Okay, I gave your patch a go and it works correctly on our non-SMP capable
boards (and with DEBUG_SPINLOCK=y).

Feel free to add:

Tested-by: Nicolas Schichan <nschichan@...ebox.fr>

Regards,

-- 
Nicolas Schichan
Freebox SAS
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