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Date: Wed, 8 Nov 2006 16:32:03 -0800 From: "Chen, Kenneth W" <kenneth.w.chen@...el.com> To: "Kok, Auke-jan H" <auke-jan.h.kok@...el.com>, "'Jeff Garzik'" <jgarzik@...ox.com> Cc: "'Andrew Morton'" <akpm@...l.org>, "'NetDev'" <netdev@...r.kernel.org>, "'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>, "Brandeburg, Jesse" <jesse.brandeburg@...el.com>, "Luck, Tony" <tony.luck@...el.com>, <linux-ia64@...r.kernel.org> Subject: RE: e1000: include <net/ip6_checksum.h> for IA64 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@...el.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@...el.com> + * Copyright (C) 2002, 2006 Intel Corp. + * Copyright (C) 2002, 2006 Ken Chen <kenneth.w.chen@...el.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 */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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