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    SubjectRE: e1000: include <net/ip6_checksum.h> for IA64
    Date
    Chen, Kenneth wrote on Wednesday, November 08, 2006 4:10 PM
    > Auke Kok wrote on Wednesday, November 08, 2006 9:49 AM
    > > Of course, someone really should come up with an asm version for ia64 of the
    > > missing function ;)
    >
    > Sure, absolutely. Here is an implementation for ia64. Tested heavily. Tony, please > merge.


    Hmm. Forgot about the signed-off line. Here it is:

    Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>



    [patch] implement csum_ipv6_magic for ia64. The asm version is 3.4 times faster than
    the generic version.

    --- ./arch/ia64/lib/ip_fast_csum.S.orig 2006-11-08 12:26:28.000000000 -0800
    +++ ./arch/ia64/lib/ip_fast_csum.S 2006-11-08 16:39:24.000000000 -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@intel.com>
    + * Copyright (C) 2002, 2006 Intel Corp.
    + * Copyright (C) 2002, 2006 Ken Chen <kenneth.w.chen@intel.com>
    */

    #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=in2,in3,16,16
    + ;;
    + ld4 r22=[in0],4
    + ld4 r23=[in1],4
    + mux1 r15=r15,@rev
    + ;;
    + ld4 r24=[in0],4
    + ld4 r25=[in1],4
    + shr.u r15=r15,32
    + 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=r8,16 // now fold sum into short
    + zxt2 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 2006-11-08 16:52:16.000000000 -0800
    +++ ./include/asm-ia64/checksum.h 2006-11-08 17:01:09.000000000 -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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