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References: <20200220041608.30289-1-lukenels@cs.washington.edu>
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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Mon, 24 Feb 2020 16:42:05 -0800
Message-ID: <CAADnVQJTtNu5a2oM=8poe6FHXeQttG44S+7XvuqQtv1Cgui8tg@mail.gmail.com>
Subject: Re: [PATCH v3 bpf-next] RV32G eBPF JIT
To:     Luke Nelson <lukenels@cs.washington.edu>
Cc:     bpf <bpf@vger.kernel.org>, Jiong Wang <jiong.wang@netronome.com>,
        Xi Wang <xi.wang@gmail.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Andrii Nakryiko <andriin@fb.com>,
        =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn.topel@gmail.com>,
        linux-riscv@lists.infradead.org,
        LKML <linux-kernel@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>
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On Wed, Feb 19, 2020 at 8:20 PM Luke Nelson <lukenels@cs.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@netronome.com>
> Co-developed-by: Xi Wang <xi.wang@gmail.com>
> Signed-off-by: Xi Wang <xi.wang@gmail.com>
> Signed-off-by: Luke Nelson <lukenels@cs.washington.edu>

Bjorn,

please review.