[PATCH v7 3/4] riscv: Add checksum library

[Conor Dooley]

Hey,

On Tue, Sep 19, 2023 at 11:44:32AM -0700, Charlie Jenkins wrote:
> Provide a 32 and 64 bit version of do_csum. When compiled for 32-bit
> will load from the buffer in groups of 32 bits, and when compiled for
> 64-bit will load in groups of 64 bits.
> 
> Signed-off-by: Charlie Jenkins <charlie at rivosinc.com>
> ---
>  arch/riscv/include/asm/checksum.h |  12 +++
>  arch/riscv/lib/Makefile           |   1 +
>  arch/riscv/lib/csum.c             | 217 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 230 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/checksum.h b/arch/riscv/include/asm/checksum.h
> index dc0dd89f2a13..7fcd07edb8b3 100644
> --- a/arch/riscv/include/asm/checksum.h
> +++ b/arch/riscv/include/asm/checksum.h
> @@ -12,6 +12,18 @@
>  
>  #define ip_fast_csum ip_fast_csum
>  
> +extern unsigned int do_csum(const unsigned char *buff, int len);
> +#define do_csum do_csum
> +
> +/* Default version is sufficient for 32 bit */
> +#ifdef CONFIG_64BIT
> +#define _HAVE_ARCH_IPV6_CSUM
> +__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
> +			const struct in6_addr *daddr,
> +			__u32 len, __u8 proto, __wsum sum);
> +#endif
> +
> +// Define riscv versions of functions before importing asm-generic/checksum.h

As a nit item, you're using two different one-line comment styles in
this hunk. Otherwise, looks like you've addressed the things I didn't
like, as much as was possible. You get an a-b, not an r-b since I've not
reviewed the actual algorithm here.

Acked-by: Conor Dooley <conor.dooley at microchip.com>

Thanks,
Conor.
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