toeplitz.c

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    1 /*-
    2  * Copyright (c) 2010 David Malone <dwmalone@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/types.h>
   31 
   32 #include <net/rss_config.h>
   33 #include <net/toeplitz.h>
   34 
   35 #include <sys/systm.h>
   36 
   37 uint32_t
   38 toeplitz_hash(u_int keylen, const uint8_t *key, u_int datalen,
   39     const uint8_t *data)
   40 {
   41         uint32_t hash = 0, v;
   42         u_int i, b;
   43 
   44         /* XXXRW: Perhaps an assertion about key length vs. data length? */
   45 
   46         v = (key[0]<<24) + (key[1]<<16) + (key[2] <<8) + key[3];
   47         for (i = 0; i < datalen; i++) {
   48                 for (b = 0; b < 8; b++) {
   49                         if (data[i] & (1<<(7-b)))
   50                                 hash ^= v;
   51                         v <<= 1;
   52                         if ((i + 4) < RSS_KEYSIZE &&
   53                             (key[i+4] & (1<<(7-b))))
   54                                 v |= 1;
   55                 }
   56         }
   57         return (hash);
   58 }

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FreeBSD/Linux Kernel Cross Reference sys/net/toeplitz.c

FreeBSD/Linux Kernel Cross Reference
sys/net/toeplitz.c