netdev - Re: [PATCH net-next] tc: bpf: add checksum helpers

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Date:	Mon, 06 Apr 2015 16:42:57 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	daniel@...earbox.net, jiri@...nulli.us, jhs@...atatu.com,
	linux-api@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tc: bpf: add checksum helpers

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Wed,  1 Apr 2015 17:12:13 -0700

> Commit 608cd71a9c7c ("tc: bpf: generalize pedit action") has added the
> possibility to mangle packet data to BPF programs in the tc pipeline.
> This patch adds two helpers bpf_l3_csum_replace() and bpf_l4_csum_replace()
> for fixing up the protocol checksums after the packet mangling.
> 
> It also adds 'flags' argument to bpf_skb_store_bytes() helper to avoid
> unnecessary checksum recomputations when BPF programs adjusting l3/l4
> checksums and documents all three helpers in uapi header.
> 
> Moreover, a sample program is added to show how BPF programs can make use
> of the mangle and csum helpers.
> 
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

Applied, thanks.
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