netdev - Re: [PATCH v4] lpc32xx: Added ethernet driver

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Message-ID: <1330994958.9504.2.camel@edumazet-glaptop>
Date:	Mon, 05 Mar 2012 16:49:18 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.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 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.



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