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

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Date: Tue, 19 Sep 2023 15:43:23 +0800
From: Pu Lehui <pulehui@...weicloud.com>
To: Conor Dooley <conor@...nel.org>
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 2023/9/19 15:38, Conor Dooley wrote:
> 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 :)
> 
OK, will drop if have next

>> 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.