netdev - Re: [PATCH net-next] bpf: add skb_postpush_rcsum and fix dev_forward

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Date:	Thu, 7 Jan 2016 02:53:10 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
Cc:	alexei.starovoitov@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bpf: add skb_postpush_rcsum and fix
 dev_forward_skb occasions

On 07.01.2016 02:01, Daniel Borkmann wrote:
> +static inline void skb_postpush_rcsum(struct sk_buff *skb,
> +				      const void *start, unsigned int len)
> +{
> +	if (skb->ip_summed == CHECKSUM_COMPLETE)
> +		skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));

skb->csum = csum_partial(start, len, skb->csum);

should work without calling carry-add twice, no?

Bye,
Hannes


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