netdev - confusion about tkey_extract

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Message-ID: <CA+NCTVodoJFT2C=QXM873PoTVvUWZ10GzGrkGhDKqSUzi3rt+Q@mail.gmail.com>
Date:	Mon, 2 Sep 2013 11:46:53 +0800
From:	ke wang <hacklinux66@...il.com>
To:	netdev@...r.kernel.org
Cc:	hacklinux66@...il.com
Subject: confusion about tkey_extract_bits, please help.

hi:

  i had a question about ipv6 routing in 2.6.39. what the algorithm of
the function tkey_extract_bits. can anyone give me some advice on it,
thank u indeed .

static inline t_key tkey_extract_bits(t_key a, unsigned int offset,
unsigned int bits)
{
    if (offset < KEYLENGTH)
        return ((t_key)(a << offset)) >> (KEYLENGTH - bits);
    else
        return 0;
}
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