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Date:	Wed, 10 Sep 2014 22:13:48 -0700
From:	Eric Dumazet <>
To:	Scott Wood <>
	Tom Herbert <>
Subject: Re: [PATCH] udp: Fix inverted NAPI_GRO_CB(skb)->flush test

On Wed, 2014-09-10 at 21:23 -0500, Scott Wood wrote:
> 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 <>
> Signed-off-by: Scott Wood <>
> ---
>  net/ipv4/udp_offload.c | 2 +-
>  net/ipv6/udp_offload.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Good catch, thanks !

Acked-by: Eric Dumazet <>

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