linux-kernel - Re: [PATCH v3 bpf-next] RV32G eBPF JIT

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Message-ID: <CAADnVQJTtNu5a2oM=8poe6FHXeQttG44S+7XvuqQtv1Cgui8tg@mail.gmail.com>
Date:   Mon, 24 Feb 2020 16:42:05 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Luke Nelson <lukenels@...washington.edu>
Cc:     bpf <bpf@...r.kernel.org>, Jiong Wang <jiong.wang@...ronome.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>,
        Björn Töpel <bjorn.topel@...il.com>,
        linux-riscv@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 bpf-next] RV32G eBPF JIT

On Wed, Feb 19, 2020 at 8:20 PM Luke Nelson <lukenels@...washington.edu> wrote:
>
> This is an eBPF JIT for RV32G, adapted from the JIT for RV64G and
> the 32-bit ARM JIT.
...
> v2 -> v3:
>   * Added support for far jumps / branches similar to RV64 JIT.
>   * Added support for tail calls.
>   * Cleaned up code with more optimizations and comments.
>   * Removed special zero-extension instruction from BPF_ALU64
>     case, pointed out by Jiong Wang.
>
> v1 -> v2:
>   * Added support for far conditional branches.
>   * Added the zero-extension optimization pointed out by Jiong Wang.
>   * Added more optimizations for operations with an immediate operand.
>
> Cc: Jiong Wang <jiong.wang@...ronome.com>
> Co-developed-by: Xi Wang <xi.wang@...il.com>
> Signed-off-by: Xi Wang <xi.wang@...il.com>
> Signed-off-by: Luke Nelson <lukenels@...washington.edu>

Bjorn,

please review.