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Date:	Mon, 13 Apr 2015 20:04:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	romieu@...zoreil.com
Cc:	nbd@...nwrt.org, netdev@...r.kernel.org, zajec5@...il.com,
	hauke@...ke-m.de
Subject: Re: [PATCH v5 4/9] bgmac: simplify rx DMA error handling

From: Francois Romieu <romieu@...zoreil.com>
Date: Tue, 14 Apr 2015 01:20:40 +0200

> Felix Fietkau <nbd@...nwrt.org> :
>> Unmap the DMA buffer before checking it. If an error occurs, free the
>> buffer and allocate a new one. If allocation or mapping fails, retry as
>> long as there is NAPI poll budget left (count every attempt instead of
>> every frame).
> 
> The driver is not supposed to use the NAPI budget this way.
> 
> If the driver can't reserve resources to handle the packet, it should
> drop the data, keep everything in place for the hardware and move to the
> next slot.

+1
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