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sctp: remove unnecessary byteshifting, calculate directly in big-endian

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Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harvey Harrison
2008-07-18 23:07:09 -07:00
committed by David S. Miller
parent 4e54064e0a
commit 336d3262df
4 changed files with 20 additions and 15 deletions
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23
include/net/sctp/checksum.h
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@@ -46,9 +46,14 @@
#include <net/sctp/sctp.h>
#include <linux/crc32c.h>
static inline __u32 sctp_start_cksum(__u8 *buffer, __u16 length)
static inline __be32 sctp_crc32c(__be32 crc, u8 *buffer, u16 length)
{
__u32 crc = ~(__u32) 0;
return (__force __be32)crc32c((__force u32)crc, buffer, length);
}
static inline __be32 sctp_start_cksum(__u8 *buffer, __u16 length)
{
__be32 crc = ~cpu_to_be32(0);
__u8 zero[sizeof(__u32)] = {0};
/* Optimize this routine to be SCTP specific, knowing how
@@ -56,23 +61,23 @@ static inline __u32 sctp_start_cksum(__u8 *buffer, __u16 length)
*/
/* Calculate CRC up to the checksum. */
crc = crc32c(crc, buffer, sizeof(struct sctphdr) - sizeof(__u32));
crc = sctp_crc32c(crc, buffer, sizeof(struct sctphdr) - sizeof(__u32));
/* Skip checksum field of the header. */
crc = crc32c(crc, zero, sizeof(__u32));
crc = sctp_crc32c(crc, zero, sizeof(__u32));
/* Calculate the rest of the CRC. */
crc = crc32c(crc, &buffer[sizeof(struct sctphdr)],
crc = sctp_crc32c(crc, &buffer[sizeof(struct sctphdr)],
length - sizeof(struct sctphdr));
return crc;
}
static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
static inline __be32 sctp_update_cksum(__u8 *buffer, __u16 length, __be32 crc32)
{
return crc32c(crc32, buffer, length);
return sctp_crc32c(crc32, buffer, length);
}
static inline __u32 sctp_end_cksum(__u32 crc32)
static inline __be32 sctp_end_cksum(__be32 crc32)
{
return ntohl(~crc32);
return ~crc32;
}