linux-kernel - Re: [PATCH v4 4/5] riscv: Vector checksum library

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Message-ID: <20230914-pennant-obligate-db3adf056281@wendy>
Date:   Thu, 14 Sep 2023 13:46:29 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Charlie Jenkins <charlie@...osinc.com>
CC:     Palmer Dabbelt <palmer@...belt.com>,
        Conor Dooley <conor@...nel.org>,
        Samuel Holland <samuel.holland@...ive.com>,
        David Laight <David.Laight@...lab.com>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v4 4/5] riscv: Vector checksum library

On Mon, Sep 11, 2023 at 03:57:14PM -0700, Charlie Jenkins wrote:
> This patch is not ready for merge as vector support in the kernel is
> limited. However, the code has been tested in QEMU so the algorithms
> do work. This code requires the kernel to be compiled with C vector
> support, but that is not yet possible. It is written in assembly
> rather than using the GCC vector instrinsics because they did not
> provide optimal code.
> 
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> ---
>  arch/riscv/lib/csum.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/arch/riscv/lib/csum.c b/arch/riscv/lib/csum.c
> index 47d98c51bab2..eb4596fc7f5b 100644
> --- a/arch/riscv/lib/csum.c
> +++ b/arch/riscv/lib/csum.c
> @@ -12,6 +12,10 @@
>  
>  #include <net/checksum.h>
>  
> +#ifdef CONFIG_RISCV_ISA_V
> +#include <riscv_vector.h>

What actually includes this header, I don't see it in either Andy's
in-kernel vector series or Bjorn's blake2 one.
Can you link to the pre-requisites in your cover letter please.

Thanks,
Conor.

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