linux-kernel - Re: [MeeGo-Dev][PATCH v3] Topcliff: Update PCH

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Message-Id: <20101005.114506.184852374.davem@davemloft.net>
Date:	Tue, 05 Oct 2010 11:45:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	masa-korg@....okisemi.com
Cc:	mkl@...gutronix.de, sameo@...ux.intel.com, chripell@...e.org,
	meego-dev@...go.com, morinaga526@....okisemi.com,
	joel.clark@...el.com, kok.howg.ewe@...el.com,
	socketcan-core@...ts.berlios.de, yong.y.wang@...el.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	margie.foster@...el.com, qi.wang@...el.com,
	andrew.chih.howe.khor@...el.com, wg@...ndegger.com
Subject: Re: [MeeGo-Dev][PATCH v3] Topcliff: Update PCH_CAN driver to 2.6.35

From: "Masayuki Ohtake" <masa-korg@....okisemi.com>
Date: Tue, 5 Oct 2010 21:09:30 +0900

> On Tuesday, October 05, 2010 8:08 PM, Marc Kleine-Budde wrote:
>> If FIFO is working you might also think about NAPI.
> 
> I think NAPI isn't necessary for our CAN driver.
> NAPI is for high-speed networking.
> CAN is NOT high-speed.
> 
> In fact, some accepted CAN drivers don't have NAPI.

NAPI is not just for performance concerns.

It greatly simplifies the locking since all packet processing paths
run only in software interrupt context, never in hardware interrupt
context.

We encourage all new drivers that can use NAPI to do so, just because
recent driver submissions do not do this doesn't mean we should
continue such a mistake ;-)
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