linux-kernel - Re: [PATCH bpf-next 0/4] RV64 BPF JIT Optimizations

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Date:   Wed, 6 May 2020 09:08:21 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Luke Nelson <lukenels@...washington.edu>
Cc:     bpf <bpf@...r.kernel.org>, Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Netdev <netdev@...r.kernel.org>, linux-riscv@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next 0/4] RV64 BPF JIT Optimizations

On Wed, 6 May 2020 at 02:03, Luke Nelson <lukenels@...washington.edu> wrote:
>
> This patch series introduces a set of optimizations to the BPF JIT
> on RV64. The optimizations are related to the verifier zero-extension
> optimization and BPF_JMP BPF_K.
>
> We tested the optimizations on a QEMU riscv64 virt machine, using
> lib/test_bpf and test_verifier, and formally verified their correctness
> using Serval.
>

Luke and Xi,

Thanks a lot for working on this! Very nice series!

For the series:
Reviewed-by: Björn Töpel <bjorn.topel@...il.com>
Acked-by: Björn Töpel <bjorn.topel@...il.com>

> Luke Nelson (4):
>   bpf, riscv: Enable missing verifier_zext optimizations on RV64
>   bpf, riscv: Optimize FROM_LE using verifier_zext on RV64
>   bpf, riscv: Optimize BPF_JMP BPF_K when imm == 0 on RV64
>   bpf, riscv: Optimize BPF_JSET BPF_K using andi on RV64
>
>  arch/riscv/net/bpf_jit_comp64.c | 64 ++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 20 deletions(-)
>
> Cc: Xi Wang <xi.wang@...il.com>
>
> --
> 2.17.1
>