netdev - Re: [PATCH net] xen-netfront: fix missing rx_refill

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Date:	Mon, 18 Nov 2013 13:57:35 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	majieyue@...il.com
Cc:	netdev@...r.kernel.org, konrad.wilk@...cle.com,
	wei.liu2@...rix.com, jieyue.majy@...baba-inc.com,
	david.vrabel@...rix.com, annie.li@...cle.com,
	boris.ostrovsky@...cle.com, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH net] xen-netfront: fix missing rx_refill_timer when
 allocate memory failed

From: Ma JieYue <majieyue@...il.com>
Date: Fri, 15 Nov 2013 12:26:13 +0800

> From: Ma JieYue <jieyue.majy@...baba-inc.com>
> 
> There was a bug in xennet_alloc_rx_buffers, when allocating page or
> sk_buff failed, and at the same time rx_batch queue not empty,
> the rx_refill_timer timer won't be scheduled. If finally the remaining
> request buffers in rx ring less than what backend driver expected,
> the backend driver would think of rx ring as full and start dropping packets.
> In such situation, there is no way for the netfront driver to recover
> automatically, so that the device can not work properly.
> 
> The patch fixes the problem by always scheduling rx_refill_timer timer when
> alloc_page or __netdev_alloc_skb fails, no matter whether rx_batch queue is
> empty or not. It ensures that the rx ring request buffers will finally meet
> the backend needs.
> 
> Signed-off-by: Ma JieYue <jieyue.majy@...baba-inc.com>

Looks good, applied, thanks!
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