netdev - Re: [PATCH] ip: reuse ip_summed of first fragment for all subsequent fragments

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Message-Id: <20101228.134905.183040321.davem@davemloft.net>
Date:	Tue, 28 Dec 2010 13:49:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	timo.lindfors@....fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ip: reuse ip_summed of first fragment for all
 subsequent fragments

From: Timo Juhani Lindfors <timo.lindfors@....fi>
Date: Mon, 20 Dec 2010 12:38:45 +0200

> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> index 439d2a3..c0743ed 100644
> --- a/net/ipv4/ip_output.c
> +++ b/net/ipv4/ip_output.c
> @@ -1167,7 +1167,7 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
>  			/*
>  			 *	Fill in the control structures
>  			 */
> -			skb->ip_summed = CHECKSUM_NONE;
> +			skb->ip_summed = skb_prev->ip_summed;
>  			skb->csum = 0;
>  			skb_reserve(skb, hh_len);

You can't just assign skb_prev->ip_summed here, if it's CHECKSUM_PARTIAL
then things will go completely wrong.  This is especially true since
we're about to zero out skb->csum.
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