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Date:   Fri, 17 Mar 2017 12:00:42 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        netdev@...r.kernel.org, davem@...emloft.net,
        luke.starrett@...adcom.com, catalin.marinas@....com
Cc:     James Greenhalgh <James.Greenhalgh@....com>
Subject: Re: [PATCH net-next] ipv6: Implement optimized IPv6 masked address
 comparison for ARM64

On 17/03/17 04:42, Subash Abhinov Kasiviswanathan wrote:
> Android devices use multiple ip[6]tables for statistics, UID matching
> and other functionality. Perf output indicated that ip6_do_table
> was taking a considerable amount of CPU and more that ip_do_table
> for an equivalent rate. ipv6_masked_addr_cmp was chosen for
> optimization as there are more instructions required than the
> equivalent operation in ip_packet_match.
> 
> Using 128 bit operations helps to reduce the number of instructions
> for the match on an ARM64 system. This helps to improve UDPv6 DL
> performance by 40Mbps (860Mbps -> 900Mbps) on a CPU limited system.

After trying to have a look at the codegen difference it makes, I think
I may have found why it's faster ;)

----------
[root@...ce-channel-5 ~]# cat > ip.c
#include <stdbool.h>
#include <netinet/in.h>
	
bool
ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
		     const struct in6_addr *a2)
{
	const unsigned long *ul1 = (const unsigned long *)a1;
	const unsigned long *ulm = (const unsigned long *)m;
	const unsigned long *ul2 = (const unsigned long *)a2;

	return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
		  ((ul1[1] ^ ul2[1]) & ulm[1]));
}

bool
ipv6_masked_addr_cmp_new(const struct in6_addr *a1, const struct
in6_addr *m,
		     const struct in6_addr *a2)
{
	const __uint128_t *ul1 = (const __uint128_t *)a1;
	const __uint128_t *ulm = (const __uint128_t *)m;
	const __uint128_t *ul2 = (const __uint128_t *)a1;

	return !!((*ul1 ^ *ul2) & *ulm);
}
[root@...ce-channel-5 ~]# gcc -c -O2 ip.c
[root@...ce-channel-5 ~]# objdump -d ip.o

ip.o:     file format elf64-littleaarch64


Disassembly of section .text:

0000000000000000 <ipv6_masked_addr_cmp>:
   0:	a9401847 	ldp	x7, x6, [x2]
   4:	a9401003 	ldp	x3, x4, [x0]
   8:	f9400025 	ldr	x5, [x1]
   c:	f9400422 	ldr	x2, [x1, #8]
  10:	ca070060 	eor	x0, x3, x7
  14:	ca060081 	eor	x1, x4, x6
  18:	8a050000 	and	x0, x0, x5
  1c:	8a020021 	and	x1, x1, x2
  20:	aa010000 	orr	x0, x0, x1
  24:	f100001f 	cmp	x0, #0x0
  28:	1a9f07e0 	cset	w0, ne  // ne = any
  2c:	d65f03c0 	ret

0000000000000030 <ipv6_masked_addr_cmp_new>:
  30:	52800000 	mov	w0, #0x0                   	// #0
  34:	d65f03c0 	ret
[root@...ce-channel-5 ~]# gcc --version
gcc (GCC) 6.3.1 20170306
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

----------

That's clearly not right - I'm not sure quite what undefined behaviour
assumption convinces GCC to optimise the whole thing away, but I do note
that the generic 64-bit version really isn't far off optimal already.
Even if it happens to work out in practice due to inlining behaviour, I
don't think that's something we'd want to rely on.

Robin.

> Tested on x86_64 UML to check if generic version is used and ARM64
> to verify that ARM64 version is used.
> 
> Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
> ---
>  arch/alpha/include/asm/Kbuild      |  1 +
>  arch/arc/include/asm/Kbuild        |  1 +
>  arch/arm/include/asm/Kbuild        |  1 +
>  arch/arm64/include/asm/ipv6.h      | 29 +++++++++++++++++++++++++++++
>  arch/avr32/include/asm/Kbuild      |  1 +
>  arch/blackfin/include/asm/Kbuild   |  1 +
>  arch/c6x/include/asm/Kbuild        |  1 +
>  arch/cris/include/asm/Kbuild       |  1 +
>  arch/frv/include/asm/Kbuild        |  1 +
>  arch/h8300/include/asm/Kbuild      |  1 +
>  arch/hexagon/include/asm/Kbuild    |  1 +
>  arch/ia64/include/asm/Kbuild       |  1 +
>  arch/m32r/include/asm/Kbuild       |  1 +
>  arch/m68k/include/asm/Kbuild       |  1 +
>  arch/metag/include/asm/Kbuild      |  1 +
>  arch/microblaze/include/asm/Kbuild |  1 +
>  arch/mips/include/asm/Kbuild       |  1 +
>  arch/mn10300/include/asm/Kbuild    |  1 +
>  arch/nios2/include/asm/Kbuild      |  1 +
>  arch/openrisc/include/asm/Kbuild   |  1 +
>  arch/parisc/include/asm/Kbuild     |  1 +
>  arch/powerpc/include/asm/Kbuild    |  1 +
>  arch/s390/include/asm/Kbuild       |  1 +
>  arch/score/include/asm/Kbuild      |  1 +
>  arch/sh/include/asm/Kbuild         |  1 +
>  arch/sparc/include/asm/Kbuild      |  1 +
>  arch/tile/include/asm/Kbuild       |  1 +
>  arch/um/include/asm/Kbuild         |  1 +
>  arch/unicore32/include/asm/Kbuild  |  1 +
>  arch/x86/include/asm/Kbuild        |  1 +
>  arch/xtensa/include/asm/Kbuild     |  1 +
>  include/asm-generic/ipv6.h         | 32 ++++++++++++++++++++++++++++++++
>  include/net/ipv6.h                 | 20 +-------------------
>  33 files changed, 92 insertions(+), 19 deletions(-)
>  create mode 100644 arch/arm64/include/asm/ipv6.h
>  create mode 100644 include/asm-generic/ipv6.h
> 
> diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild
> index d103db5..5b7e92b 100644
> --- a/arch/alpha/include/asm/Kbuild
> +++ b/arch/alpha/include/asm/Kbuild
> @@ -3,6 +3,7 @@
>  generic-y += clkdev.h
>  generic-y += exec.h
>  generic-y += export.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
> index 63a0401..99f1456 100644
> --- a/arch/arc/include/asm/Kbuild
> +++ b/arch/arc/include/asm/Kbuild
> @@ -14,6 +14,7 @@ generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kmap_types.h
> diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
> index b14e8c7..a0ba9ac 100644
> --- a/arch/arm/include/asm/Kbuild
> +++ b/arch/arm/include/asm/Kbuild
> @@ -9,6 +9,7 @@ generic-y += errno.h
>  generic-y += exec.h
>  generic-y += ioctl.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += kdebug.h
>  generic-y += local.h
> diff --git a/arch/arm64/include/asm/ipv6.h b/arch/arm64/include/asm/ipv6.h
> new file mode 100644
> index 0000000..d49dec6
> --- /dev/null
> +++ b/arch/arm64/include/asm/ipv6.h
> @@ -0,0 +1,29 @@
> +/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __ASM_IPV6_H
> +#define __ASM_IPV6_H
> +
> +#include <linux/types.h>
> +
> +static inline bool
> +ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
> +		     const struct in6_addr *a2)
> +{
> +	const __uint128_t *ul1 = (const __uint128_t *)a1;
> +	const __uint128_t *ulm = (const __uint128_t *)m;
> +	const __uint128_t *ul2 = (const __uint128_t *)a1;
> +
> +	return !!((*ul1 ^ *ul2) & *ulm);
> +}
> +#define ipv6_masked_addr_cmp ipv6_masked_addr_cmp
> +#endif /* __ASM_IPV6_H */
> diff --git a/arch/avr32/include/asm/Kbuild b/arch/avr32/include/asm/Kbuild
> index 3d7ef2c..fd6a964 100644
> --- a/arch/avr32/include/asm/Kbuild
> +++ b/arch/avr32/include/asm/Kbuild
> @@ -6,6 +6,7 @@ generic-y += div64.h
>  generic-y += emergency-restart.h
>  generic-y += exec.h
>  generic-y += futex.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += local.h
> diff --git a/arch/blackfin/include/asm/Kbuild b/arch/blackfin/include/asm/Kbuild
> index 625db8a..f713d85 100644
> --- a/arch/blackfin/include/asm/Kbuild
> +++ b/arch/blackfin/include/asm/Kbuild
> @@ -12,6 +12,7 @@ generic-y += futex.h
>  generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/c6x/include/asm/Kbuild b/arch/c6x/include/asm/Kbuild
> index 82619c3..ff8033f 100644
> --- a/arch/c6x/include/asm/Kbuild
> +++ b/arch/c6x/include/asm/Kbuild
> @@ -20,6 +20,7 @@ generic-y += io.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
> index 0f5132b..c5b5fa0 100644
> --- a/arch/cris/include/asm/Kbuild
> +++ b/arch/cris/include/asm/Kbuild
> @@ -15,6 +15,7 @@ generic-y += futex.h
>  generic-y += hardirq.h
>  generic-y += ioctl.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/frv/include/asm/Kbuild b/arch/frv/include/asm/Kbuild
> index c33b467..0717ffb 100644
> --- a/arch/frv/include/asm/Kbuild
> +++ b/arch/frv/include/asm/Kbuild
> @@ -1,6 +1,7 @@
>  
>  generic-y += clkdev.h
>  generic-y += exec.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
> index 341740c..0058275 100644
> --- a/arch/h8300/include/asm/Kbuild
> +++ b/arch/h8300/include/asm/Kbuild
> @@ -23,6 +23,7 @@ generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild
> index 797b64a..4985925 100644
> --- a/arch/hexagon/include/asm/Kbuild
> +++ b/arch/hexagon/include/asm/Kbuild
> @@ -20,6 +20,7 @@ generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += iomap.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild
> index 502a91d..cacba4c 100644
> --- a/arch/ia64/include/asm/Kbuild
> +++ b/arch/ia64/include/asm/Kbuild
> @@ -1,6 +1,7 @@
>  
>  generic-y += clkdev.h
>  generic-y += exec.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += kvm_para.h
>  generic-y += mcs_spinlock.h
> diff --git a/arch/m32r/include/asm/Kbuild b/arch/m32r/include/asm/Kbuild
> index deb2987..8ed14f5 100644
> --- a/arch/m32r/include/asm/Kbuild
> +++ b/arch/m32r/include/asm/Kbuild
> @@ -2,6 +2,7 @@
>  generic-y += clkdev.h
>  generic-y += current.h
>  generic-y += exec.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += kvm_para.h
>  generic-y += mcs_spinlock.h
> diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
> index d4f9ccb..1ddfeac 100644
> --- a/arch/m68k/include/asm/Kbuild
> +++ b/arch/m68k/include/asm/Kbuild
> @@ -9,6 +9,7 @@ generic-y += futex.h
>  generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/metag/include/asm/Kbuild b/arch/metag/include/asm/Kbuild
> index f9b9df5..2382a6e 100644
> --- a/arch/metag/include/asm/Kbuild
> +++ b/arch/metag/include/asm/Kbuild
> @@ -16,6 +16,7 @@ generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
> index 1732ec1..66b7d8a 100644
> --- a/arch/microblaze/include/asm/Kbuild
> +++ b/arch/microblaze/include/asm/Kbuild
> @@ -3,6 +3,7 @@ generic-y += barrier.h
>  generic-y += clkdev.h
>  generic-y += device.h
>  generic-y += exec.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/mips/include/asm/Kbuild b/arch/mips/include/asm/Kbuild
> index 2535c7b..4453f33 100644
> --- a/arch/mips/include/asm/Kbuild
> +++ b/arch/mips/include/asm/Kbuild
> @@ -5,6 +5,7 @@ generic-y += current.h
>  generic-y += dma-contiguous.h
>  generic-y += emergency-restart.h
>  generic-y += export.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += local64.h
>  generic-y += mcs_spinlock.h
> diff --git a/arch/mn10300/include/asm/Kbuild b/arch/mn10300/include/asm/Kbuild
> index 97f64c7..df55c2b 100644
> --- a/arch/mn10300/include/asm/Kbuild
> +++ b/arch/mn10300/include/asm/Kbuild
> @@ -2,6 +2,7 @@
>  generic-y += barrier.h
>  generic-y += clkdev.h
>  generic-y += exec.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/nios2/include/asm/Kbuild b/arch/nios2/include/asm/Kbuild
> index aaa3c21..d6b13ee 100644
> --- a/arch/nios2/include/asm/Kbuild
> +++ b/arch/nios2/include/asm/Kbuild
> @@ -22,6 +22,7 @@ generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
> index fb01873..0d9ad5a 100644
> --- a/arch/openrisc/include/asm/Kbuild
> +++ b/arch/openrisc/include/asm/Kbuild
> @@ -25,6 +25,7 @@ generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
>  generic-y += irq.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild
> index a9909c2..b0e156e 100644
> --- a/arch/parisc/include/asm/Kbuild
> +++ b/arch/parisc/include/asm/Kbuild
> @@ -8,6 +8,7 @@ generic-y += div64.h
>  generic-y += emergency-restart.h
>  generic-y += exec.h
>  generic-y += hw_irq.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/powerpc/include/asm/Kbuild b/arch/powerpc/include/asm/Kbuild
> index 5c4fbc8..f675f7c 100644
> --- a/arch/powerpc/include/asm/Kbuild
> +++ b/arch/powerpc/include/asm/Kbuild
> @@ -1,6 +1,7 @@
>  generic-y += clkdev.h
>  generic-y += div64.h
>  generic-y += export.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += local64.h
> diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
> index 8aea32f..53a2335 100644
> --- a/arch/s390/include/asm/Kbuild
> +++ b/arch/s390/include/asm/Kbuild
> @@ -2,6 +2,7 @@ generic-y += asm-offsets.h
>  generic-y += clkdev.h
>  generic-y += dma-contiguous.h
>  generic-y += export.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/score/include/asm/Kbuild b/arch/score/include/asm/Kbuild
> index 926943a..9405456 100644
> --- a/arch/score/include/asm/Kbuild
> +++ b/arch/score/include/asm/Kbuild
> @@ -4,6 +4,7 @@ header-y +=
>  generic-y += barrier.h
>  generic-y += clkdev.h
>  generic-y += current.h
> +generic-y += ipv6.h
>  generic-y += irq_work.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
> index cf2a750..3984834 100644
> --- a/arch/sh/include/asm/Kbuild
> +++ b/arch/sh/include/asm/Kbuild
> @@ -10,6 +10,7 @@ generic-y += exec.h
>  generic-y += fcntl.h
>  generic-y += ioctl.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kvm_para.h
> diff --git a/arch/sparc/include/asm/Kbuild b/arch/sparc/include/asm/Kbuild
> index e9e837b..d2acdaf 100644
> --- a/arch/sparc/include/asm/Kbuild
> +++ b/arch/sparc/include/asm/Kbuild
> @@ -6,6 +6,7 @@ generic-y += div64.h
>  generic-y += emergency-restart.h
>  generic-y += exec.h
>  generic-y += export.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += linkage.h
> diff --git a/arch/tile/include/asm/Kbuild b/arch/tile/include/asm/Kbuild
> index aa48b6e..9487778 100644
> --- a/arch/tile/include/asm/Kbuild
> +++ b/arch/tile/include/asm/Kbuild
> @@ -12,6 +12,7 @@ generic-y += fcntl.h
>  generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
> +generic-y += ipv6.h
>  generic-y += ipcbuf.h
>  generic-y += irq_regs.h
>  generic-y += local.h
> diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
> index e9d42aa..b226353 100644
> --- a/arch/um/include/asm/Kbuild
> +++ b/arch/um/include/asm/Kbuild
> @@ -11,6 +11,7 @@ generic-y += futex.h
>  generic-y += hardirq.h
>  generic-y += hw_irq.h
>  generic-y += io.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild
> index 84205fe..d01d723 100644
> --- a/arch/unicore32/include/asm/Kbuild
> +++ b/arch/unicore32/include/asm/Kbuild
> @@ -19,6 +19,7 @@ generic-y += hw_irq.h
>  generic-y += ioctl.h
>  generic-y += ioctls.h
>  generic-y += ipcbuf.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
> index 5d6a53f..8a68e12 100644
> --- a/arch/x86/include/asm/Kbuild
> +++ b/arch/x86/include/asm/Kbuild
> @@ -9,5 +9,6 @@ generated-y += xen-hypercalls.h
>  generic-y += clkdev.h
>  generic-y += dma-contiguous.h
>  generic-y += early_ioremap.h
> +generic-y += ipv6.h
>  generic-y += mcs_spinlock.h
>  generic-y += mm-arch-hooks.h
> diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild
> index f41408c..dc02075 100644
> --- a/arch/xtensa/include/asm/Kbuild
> +++ b/arch/xtensa/include/asm/Kbuild
> @@ -9,6 +9,7 @@ generic-y += exec.h
>  generic-y += fcntl.h
>  generic-y += hardirq.h
>  generic-y += ioctl.h
> +generic-y += ipv6.h
>  generic-y += irq_regs.h
>  generic-y += irq_work.h
>  generic-y += kdebug.h
> diff --git a/include/asm-generic/ipv6.h b/include/asm-generic/ipv6.h
> new file mode 100644
> index 0000000..754adac
> --- /dev/null
> +++ b/include/asm-generic/ipv6.h
> @@ -0,0 +1,32 @@
> +/*	Linux INET6 implementation
> + *
> + *	Authors:
> + *	Pedro Roque		<roque@...fc.ul.pt>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +#ifndef ipv6_masked_addr_cmp
> +#define ipv6_masked_addr_cmp ipv6_masked_addr_cmp
> +static inline bool
> +ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
> +		     const struct in6_addr *a2)
> +{
> +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
> +	const unsigned long *ul1 = (const unsigned long *)a1;
> +	const unsigned long *ulm = (const unsigned long *)m;
> +	const unsigned long *ul2 = (const unsigned long *)a2;
> +
> +	return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
> +		  ((ul1[1] ^ ul2[1]) & ulm[1]));
> +#else
> +	return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
> +		  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
> +		  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
> +		  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
> +#endif
> +}
> +#endif
> diff --git a/include/net/ipv6.h b/include/net/ipv6.h
> index dbf0abb..08ad1a98 100644
> --- a/include/net/ipv6.h
> +++ b/include/net/ipv6.h
> @@ -21,6 +21,7 @@
>  #include <net/flow.h>
>  #include <net/flow_dissector.h>
>  #include <net/snmp.h>
> +#include <asm/ipv6.h>
>  
>  #define SIN6_LEN_RFC2133	24
>  
> @@ -385,25 +386,6 @@ static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr
>  	return memcmp(a1, a2, sizeof(struct in6_addr));
>  }
>  
> -static inline bool
> -ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
> -		     const struct in6_addr *a2)
> -{
> -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
> -	const unsigned long *ul1 = (const unsigned long *)a1;
> -	const unsigned long *ulm = (const unsigned long *)m;
> -	const unsigned long *ul2 = (const unsigned long *)a2;
> -
> -	return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
> -		  ((ul1[1] ^ ul2[1]) & ulm[1]));
> -#else
> -	return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
> -		  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
> -		  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
> -		  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
> -#endif
> -}
> -
>  static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
>  				    const struct in6_addr *addr,
>  				    int plen)
> 

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