netdev - Re: [PATCH] udp: Fix inverted NAPI_GRO

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Message-Id: <20140912.175552.1008190879873868849.davem@davemloft.net>
Date:	Fri, 12 Sep 2014 17:55:52 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	scottwood@...escale.com
Cc:	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH] udp: Fix inverted NAPI_GRO_CB(skb)->flush test

From: Scott Wood <scottwood@...escale.com>
Date: Wed, 10 Sep 2014 21:23:18 -0500

> Commit 2abb7cdc0d ("udp: Add support for doing checksum unnecessary
> conversion") caused napi_gro_cb structs with the "flush" field zero to
> take the "udp_gro_receive" path rather than the "set flush to 1" path
> that they would previously take.  As a result I saw booting from an NFS
> root hang shortly after starting userspace, with "server not
> responding" messages.
> 
> This change to the handling of "flush == 0" packets appears to be
> incidental to the goal of adding new code in the case where
> skb_gro_checksum_validate_zero_check() returns zero.  Based on that and
> the fact that it breaks things, I'm assuming that it is unintentional.
> 
> Fixes: 2abb7cdc0d ("udp: Add support for doing checksum unnecessary conversion")
> Cc: Tom Herbert <therbert@...gle.com>
> Signed-off-by: Scott Wood <scottwood@...escale.com>

Applied, thank you.
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