netdev - __sk_buff.data

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Message-ID: <1492637460.22185.6.camel@sipsolutions.net>
Date:   Wed, 19 Apr 2017 23:31:00 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     netdev <netdev@...r.kernel.org>
Subject: __sk_buff.data_end

Hi Alexei, Daniel,

I'm looking at adding the __wifi_sk_buff I talked about, and I notice
that it uses CB space to store data_end. Unfortunately, in a lot of
cases, we don't have any CB space to spare in wifi.

Is there any way to generate a series of instructions that instead does
the necessary calculations? I don't actually *see* such a way, because
I don't see how I could have a scratch register or scratch stack space,
but perhaps there's a way to do it?

johannes