release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/scsi/bfa/include/cs/bfa_checksum.h

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 /**
  19  *  bfa_checksum.h BFA checksum utilities
  20  */
  21
  22 #ifndef __BFA_CHECKSUM_H__
  23 #define __BFA_CHECKSUM_H__
  24
  25 static inline u32
  26 bfa_checksum_u32(u32 *buf, int sz)
  27 {
  28         int             i, m = sz >> 2;
  29         u32     sum = 0;
  30
  31         for (i = 0; i < m; i++)
  32                 sum ^= buf[i];
  33
  34         return sum;
  35 }
  36
  37 static inline u16
  38 bfa_checksum_u16(u16 *buf, int sz)
  39 {
  40         int             i, m = sz >> 1;
  41         u16        sum = 0;
  42
  43         for (i = 0; i < m; i++)
  44                 sum ^= buf[i];
  45
  46         return sum;
  47 }
  48
  49 static inline u8
  50 bfa_checksum_u8(u8 *buf, int sz)
  51 {
  52         int             i;
  53         u8         sum = 0;
  54
  55         for (i = 0; i < sz; i++)
  56                 sum ^= buf[i];
  57
  58         return sum;
  59 }
  60 #endif