netdev - Re: [PATCH v5] bfin_mac: convert bfin Ethernet driver to NAPI framework

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Date:	Tue, 22 Jul 2014 13:19:53 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Varka Bhadram <varkabhadram@...il.com>,
	adi-buildroot-devel@...ts.sourceforge.net,
	"Zhang, Sonic" <sonic.zhang@...log.com>
Subject: Re: [PATCH v5] bfin_mac: convert bfin Ethernet driver to NAPI framework

Hi Francois,

On Fri, Jul 18, 2014 at 6:29 AM, Francois Romieu <romieu@...zoreil.com> wrote:
> Sonic Zhang <sonic.adi@...il.com> :
>> On Thu, Jul 17, 2014 at 5:03 AM, David Miller <davem@...emloft.net> wrote:
> [...]
>> > Please mimick what other drivers do rather than trying to do things in
>> > a special way unique to your driver.
>>
>> Driver realtek/8139cp.c does things in the same way as the bfin_mac
>> NAPI code.
>
> It wasn't your lucky day.
>
>> In net_poll loop, if napi_complete() is called, the EMAC IRQ is
>> enabled more times than the it is disabled. This is not a problem to
>> drivers which don't call enable_irq()/disable_irq_nosync(). But, the
>> IRQ enabling and disabling operations have to be balanced in the
>> bfin_mac driver via __napi_complete() to avoid the kernel warning.
>
> Thanks for the explanation.
>
> In order to use plain napi_complete, may I suggest keeping a mask of
> bfin_mac_interrupt disabled irq in the device private area then
> enable_irq relevant one - if any - in bfin_mac_poll ?
>
> It should keep things balanced.

This is fine to me.

Thanks,

Sonic Zhang
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