Rev 2 of the implementation. Previous patch implements "len" argument
as __u16 that was copied from the generic version. However, the argument
is pending to be changed into __u32. Update the asm code to be consistent.
Tony, please apply this one instead of previous patch.
[patch] implement csum_ipv6_magic for ia64. The asm version is 4.4 times
faster than the generic C version and 10X smaller in code size.
Signed-off-by: Ken Chen <kenneth.w.chen@xxxxxxxxx>
--- ./arch/ia64/lib/ip_fast_csum.S.orig 2006-11-10 13:44:10.000000000 -0800
+++ ./arch/ia64/lib/ip_fast_csum.S 2006-11-10 13:46:41.000000000 -0800
@@ -8,8 +8,8 @@
* in0: address of buffer to checksum (char *)
* in1: length of the buffer (int)
*
- * Copyright (C) 2002 Intel Corp.
- * Copyright (C) 2002 Ken Chen <kenneth.w.chen@xxxxxxxxx>
+ * Copyright (C) 2002, 2006 Intel Corp.
+ * Copyright (C) 2002, 2006 Ken Chen <kenneth.w.chen@xxxxxxxxx>
*/
#include <asm/asmmacro.h>
@@ -25,6 +25,9 @@
#define in0 r32
#define in1 r33
+#define in2 r34
+#define in3 r35
+#define in4 r36
#define ret0 r8
GLOBAL_ENTRY(ip_fast_csum)
@@ -88,3 +91,51 @@ GLOBAL_ENTRY(ip_fast_csum)
mov b0=r34
br.ret.sptk.many b0
END(ip_fast_csum)
+
+GLOBAL_ENTRY(csum_ipv6_magic)
+ ld4 r20=[in0],4
+ ld4 r21=[in1],4
+ dep r15=in3,in2,32,16
+ ;;
+ ld4 r22=[in0],4
+ ld4 r23=[in1],4
+ mux1 r15=r15,@rev
+ ;;
+ ld4 r24=[in0],4
+ ld4 r25=[in1],4
+ shr.u r15=r15,16
+ add r16=r20,r21
+ add r17=r22,r23
+ ;;
+ ld4 r26=[in0],4
+ ld4 r27=[in1],4
+ add r18=r24,r25
+ add r8=r16,r17
+ ;;
+ add r19=r26,r27
+ add r8=r8,r18
+ ;;
+ add r8=r8,r19
+ add r15=r15,in4
+ ;;
+ add r8=r8,r15
+ ;;
+ shr.u r10=r8,32 // now fold sum into short
+ zxt4 r11=r8
+ ;;
+ add r8=r10,r11
+ ;;
+ shr.u r10=r8,16 // yeah, keep it rolling
+ zxt2 r11=r8
+ ;;
+ add r8=r10,r11
+ ;;
+ shr.u r10=r8,16 // three times lucky
+ zxt2 r11=r8
+ ;;
+ add r8=r10,r11
+ mov r9=0xffff
+ ;;
+ andcm r8=r9,r8
+ br.ret.sptk.many b0
+END(csum_ipv6_magic)
--- ./include/asm-ia64/checksum.h.orig 2006-11-10 13:44:10.000000000 -0800
+++ ./include/asm-ia64/checksum.h 2006-11-10 13:44:15.000000000 -0800
@@ -73,4 +73,10 @@ csum_fold (unsigned int sum)
return ~sum;
}
+#define _HAVE_ARCH_IPV6_CSUM 1
+struct in6_addr;
+extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+ struct in6_addr *daddr, __u32 len, unsigned short proto,
+ unsigned int csum);
+
#endif /* _ASM_IA64_CHECKSUM_H */
-
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