linux-kernel - Re: [PATCH v4] powerpc: Implement csum_ipv6

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Date:   Thu, 24 May 2018 15:03:50 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4] powerpc: Implement csum_ipv6_magic in assembly

Looks fine to me (one comment below):

Reviewed-by: Segher Boessenkool <segher@...nel.crashing.org>

On Thu, May 24, 2018 at 11:33:18AM +0000, Christophe Leroy wrote:
> +_GLOBAL(csum_ipv6_magic)
> +	lwz	r8, 0(r3)
> +	lwz	r9, 4(r3)
> +	addc	r0, r7, r8
> +	lwz	r10, 8(r3)
> +	adde	r0, r0, r9
> +	lwz	r11, 12(r3)
> +	adde	r0, r0, r10
> +	lwz	r8, 0(r4)
> +	adde	r0, r0, r11
> +	lwz	r9, 4(r4)
> +	adde	r0, r0, r8
> +	lwz	r10, 8(r4)
> +	adde	r0, r0, r9
> +	lwz	r11, 12(r4)
> +	adde	r0, r0, r10
> +	add	r5, r5, r6	/* assumption: len + proto doesn't carry */
> +	adde	r0, r0, r11
> +	adde	r0, r0, r5
> +	addze	r0, r0
> +	rotlwi	r3, r0, 16
> +	add	r3, r0, r3
> +	not	r3, r3
> +	rlwinm	r3, r3, 16, 16, 31
> +	blr
> +EXPORT_SYMBOL(csum_ipv6_magic)
> diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S
> index d7f1a966136e..bf0546e546fc 100644
> --- a/arch/powerpc/lib/checksum_64.S
> +++ b/arch/powerpc/lib/checksum_64.S
> @@ -429,3 +429,31 @@ dstnr;	stb	r6,0(r4)
>  	stw	r6,0(r8)
>  	blr
>  EXPORT_SYMBOL(csum_partial_copy_generic)
> +
> +/*
> + * __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
> + *			   const struct in6_addr *daddr,
> + *			   __u32 len, __u8 proto, __wsum sum)
> + */
> +
> +_GLOBAL(csum_ipv6_magic)
> +	ld	r8, 0(r3)
> +	ld	r9, 8(r3)
> +	add	r5, r5, r6
> +	addc	r0, r8, r9
> +	ld	r10, 0(r4)
> +	ld	r11, 8(r4)
> +	adde	r0, r0, r10
> +	add	r5, r5, r7
> +	adde	r0, r0, r11
> +	adde	r0, r0, r5
> +	addze	r0, r0
> +	rotldi  r3 ,r0, 32		/* fold two 32 bit halves together */

Typo (s/ ,/, /).

> +	add	r3, r0, r3
> +	srdi	r0, r3, 32
> +	rotlwi	r3, r0, 16		/* fold two 16 bit halves together */
> +	add	r3, r0, r3
> +	not	r3, r3
> +	rlwinm	r3, r3, 16, 16, 31
> +	blr
> +EXPORT_SYMBOL(csum_ipv6_magic)
> -- 
> 2.13.3