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authorHarvey Harrison <harvey.harrison@gmail.com>2008-07-19 10:07:09 +0400
committerDavid S. Miller <davem@davemloft.net>2008-07-19 10:07:09 +0400
commit336d3262df71fcd2661180bb35d5ea41b4cbca58 (patch)
tree54078334c9c3706a003d4b54a8e9e9b23aa01cef /include/net/sctp/checksum.h
parent4e54064e0a13b7a7d4a481123c1783f770538e30 (diff)
downloadlinux-336d3262df71fcd2661180bb35d5ea41b4cbca58.tar.xz
sctp: remove unnecessary byteshifting, calculate directly in big-endian
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>
Diffstat (limited to 'include/net/sctp/checksum.h')
-rw-r--r--include/net/sctp/checksum.h23
1 files changed, 14 insertions, 9 deletions
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
index ba75c67cb992..b799fb21519a 100644
--- a/include/net/sctp/checksum.h
+++ b/include/net/sctp/checksum.h
@@ -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;
}