linux-kernel - Re: [PATCH] msm: rmnet: msm rmnet smd virtual ethernet driver

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Message-ID: <2c27ccc1dd4db9a31cd961f0ffaed886.squirrel@www.codeaurora.org>
Date:	Tue, 21 Dec 2010 15:45:45 -0800 (PST)
From:	nvishwan@...eaurora.org
To:	"Stephen Hemminger" <shemminger@...tta.com>
Cc:	"Niranjana Vishwanathapura" <nvishwan@...eaurora.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Brian Swetland" <swetland@...gle.com>
Subject: Re: [PATCH] msm: rmnet: msm rmnet smd virtual ethernet driver

> On Wed, 15 Dec 2010 10:31:06 -0800
> Niranjana Vishwanathapura <nvishwan@...eaurora.org> wrote:
>
>> +
>> +static DECLARE_TASKLET(smd_net_data_tasklet, smd_net_data_handler, 0);
>> +
>> +static void smd_net_notify(void *_dev, unsigned event)
>> +{
>> +	if (event != SMD_EVENT_DATA)
>> +		return;
>> +
>> +	smd_net_data_tasklet.data = (unsigned long) _dev;
>> +
>> +	tasklet_schedule(&smd_net_data_tasklet);
>> +}
>> +
>
> Rather than having private tasklet, maybe using NAPI
> would be better?
>
> Also since you are already in tasklet, no need to call netif_rx()
> when receiving packet; instead use netif_receive_skb directly.
>
> --
>

NAPI will not buy much as the SMD transport doesn't provide a machanism to
stop interrupts.  I will consider using NAPI in the future (it requires
performance testing on lot of different targets).

However, I can replace netif_rx() by netif_receive_skb() and send out new
patch

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