netdev - Re: [PATCH bpf-next v2 4/6] riscv, bpf: Add necessary Zbb instructions

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Date: Tue, 19 Sep 2023 08:38:53 +0100
From: Conor Dooley <conor@...nel.org>
To: Pu Lehui <pulehui@...weicloud.com>
Cc: bpf@...r.kernel.org, linux-riscv@...ts.infradead.org,
	netdev@...r.kernel.org,
	Björn Töpel <bjorn@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Luke Nelson <luke.r.nels@...il.com>, Pu Lehui <pulehui@...wei.com>
Subject: Re: [PATCH bpf-next v2 4/6] riscv, bpf: Add necessary Zbb
 instructions

On Tue, Sep 19, 2023 at 11:58:37AM +0800, Pu Lehui wrote:
> From: Pu Lehui <pulehui@...wei.com>
> 
> Add necessary Zbb instructions introduced by [0] to reduce code size and
> improve performance of RV64 JIT. Meanwhile, a runtime deteted helper is
> added to check whether the CPU supports Zbb instructions.
> 
> Link: https://github.com/riscv/riscv-bitmanip/releases/download/1.0.0/bitmanip-1.0.0-38-g865e7a7.pdf [0]
> Suggested-by: Conor Dooley <conor@...nel.org>

Nah, you can drop this. It was just a review comment :)

> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---
>  arch/riscv/net/bpf_jit.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/arch/riscv/net/bpf_jit.h b/arch/riscv/net/bpf_jit.h
> index 8e0ef4d08..4e24fb2bd 100644
> --- a/arch/riscv/net/bpf_jit.h
> +++ b/arch/riscv/net/bpf_jit.h
> @@ -18,6 +18,11 @@ static inline bool rvc_enabled(void)
>  	return IS_ENABLED(CONFIG_RISCV_ISA_C);
>  }
>  
> +static inline bool rvzbb_enabled(void)
> +{
> +	return IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && riscv_has_extension_likely(RISCV_ISA_EXT_ZBB);

This looks like it should work, thanks for changing it.

Cheers,
Conor.

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