linux-kernel - Re: [PATCH v4] lpc32xx: Added ethernet driver

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Message-ID: <1330997177.3022.51.camel@deadeye>
Date:	Tue, 6 Mar 2012 01:26:17 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Roland Stigge <stigge@...com.de>, <davem@...emloft.net>,
	<jeffrey.t.kirsher@...el.com>, <alexander.h.duyck@...el.com>,
	<eilong@...adcom.com>, <ian.campbell@...rix.com>,
	<netdev@...r.kernel.org>, <w.sang@...gutronix.de>,
	<linux-kernel@...r.kernel.org>, <kevin.wells@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <arnd@...db.de>,
	<baruch@...s.co.il>, <joe@...ches.com>
Subject: Re: [PATCH v4] lpc32xx: Added ethernet driver

On Mon, 2012-03-05 at 16:49 -0800, Eric Dumazet wrote:
> On Mon, 2012-03-05 at 22:45 +0000, Ben Hutchings wrote:
> > On Mon, 2012-03-05 at 22:40 +0100, Roland Stigge wrote:
> > [...]
> 
> ...
> 
> > > +				/* Copy packet from buffer */
> > > +				memcpy(prdbuf,
> > > +					pldat->rx_buff_v[rxconsidx], len);
> > > +
> > > +				/* Pass to upper layer */
> > > +				skb->protocol = eth_type_trans(skb, ndev);
> > > +				netif_rx(skb);
> > > +				ndev->last_rx = jiffies;
> > 
> > Drivers don't need to set last_rx any more.
> 
> Also, a NAPI driver should call netif_receive_skb() instead of
> netif_rx()
> 
> netif_rx() is more expensive because of additional queue, while
> netif_receive_skb() directly calls the upper stacks.

Yes, but not until the poll function is changed to enable IRQs.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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