netdev - Re: [PATCH bpf-next] libbpf: fix AF_XDP helper program to support kernels without the JMP32 eBPF instruction class

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Date:   Thu, 19 Dec 2019 14:07:46 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Alex Forster <aforster@...udflare.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Björn Töpel <bjorn.topel@...el.com>
Subject: Re: [PATCH bpf-next] libbpf: fix AF_XDP helper program to support
 kernels without the JMP32 eBPF instruction class

On Thu, Dec 19, 2019 at 12:16 PM Alex Forster <aforster@...udflare.com> wrote:
>
> Kernel 5.1 introduced support for the JMP32 eBPF instruction class, and commit d7d962a modified the libbpf AF_XDP helper program to use the BPF_JMP32_IMM instruction. For those on earlier kernels, attempting to load the helper program now results in the verifier failing with "unknown opcode 66". This change replaces the usage of BPF_JMP32_IMM with BPF_JMP_IMM for compatibility with pre-5.1 kernels.

I though af_xdp landed after jmp32 ?