netdev - Re: [PATCH] vmxnet3: fix starving rx ring whenoc

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Date:	Tue, 05 Jul 2011 18:40:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sbhatewara@...are.com
Cc:	bhutchings@...arflare.com, pv-drivers@...are.com,
	netdev@...r.kernel.org, scottjg@...are.com
Subject: Re: [PATCH] vmxnet3: fix starving rx ring whenoc_skb kb fails

From: Shreyas Bhatewara <sbhatewara@...are.com>
Date: Tue, 5 Jul 2011 17:34:05 -0700 (PDT)

> 
> If the rx ring is completely empty, then the device may never fire an rx 
> interrupt. Unfortunately, the rx interrupt is what triggers populating the 
> rx ring with fresh buffers, so this will cause networking to lock up.
> 
> This patch replenishes the skb in recv descriptor as soon as it is 
> peeled off while processing rx completions. If the skb/buffer 
> allocation fails, existing one is recycled and the packet in hand is 
> dropped. This way none of the RX desc is ever left empty, thus avoiding 
> starvation
> 
> Signed-off-by: Scott J. Goldman <scottjg@...are.com>
> Signed-off-by: Shreyas N Bhatewara <sbhatewara@...are.com>

Applied.
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