59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*-
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* Copyright (c) 2010 David Malone <dwmalone@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <net/rss_config.h>
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#include <net/toeplitz.h>
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#include <sys/systm.h>
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uint32_t
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toeplitz_hash(u_int keylen, const uint8_t *key, u_int datalen,
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const uint8_t *data)
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{
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uint32_t hash = 0, v;
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u_int i, b;
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/* XXXRW: Perhaps an assertion about key length vs. data length? */
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v = (key[0]<<24) + (key[1]<<16) + (key[2] <<8) + key[3];
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for (i = 0; i < datalen; i++) {
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for (b = 0; b < 8; b++) {
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if (data[i] & (1<<(7-b)))
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hash ^= v;
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v <<= 1;
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if ((i + 4) < RSS_KEYSIZE &&
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(key[i+4] & (1<<(7-b))))
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v |= 1;
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}
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}
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return (hash);
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}
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