netdev - Re: [PATCH bpf-next 2/8] riscv, bpf: add support for far branching

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Date:   Tue, 10 Dec 2019 06:31:28 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Netdev <netdev@...r.kernel.org>
Cc:     linux-riscv@...ts.infradead.org, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/8] riscv, bpf: add support for far branching

On Mon, 9 Dec 2019 at 18:31, Björn Töpel <bjorn.topel@...il.com> wrote:
>
> This commit adds branch relaxation to the BPF JIT, and with that
> support for far (offset greater than 12b) branching.
>
> The branch relaxation requires more than two passes to converge. For
> most programs it is three passes, but for larger programs it can be
> more.
>
> Signed-off-by: Björn Töpel <bjorn.topel@...il.com>
> ---
>  arch/riscv/net/bpf_jit_comp.c | 352 ++++++++++++++++++----------------
[...]
> +}
> +
> +static void emit_branch(u8 cond, u8 rd, u8 rs, int insn, int rvoff,

The "insn" is not used. I'll do a respin.