netdev - Re: [PATCH bpf-next v3 03/12] bpf: XDP metadata RX kfuncs

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Message-ID: <Y5AWkAYVEBqi5jy3@macbook-pro-6.dhcp.thefacebook.com>
Date:   Tue, 6 Dec 2022 20:29:04 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 03/12] bpf: XDP metadata RX kfuncs

On Mon, Dec 05, 2022 at 06:45:45PM -0800, Stanislav Fomichev wrote:
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index fc4e313a4d2e..00951a59ee26 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -15323,6 +15323,24 @@ static int fixup_kfunc_call(struct bpf_verifier_env *env, struct bpf_insn *insn,
>  		return -EINVAL;
>  	}
>  
> +	*cnt = 0;
> +
> +	if (resolve_prog_type(env->prog) == BPF_PROG_TYPE_XDP) {
> +		if (bpf_prog_is_offloaded(env->prog->aux)) {
> +			verbose(env, "no metadata kfuncs offload\n");
> +			return -EINVAL;
> +		}

If I'm reading this correctly than this error will trigger
for any XDP prog trying to use a kfunc?

I was hoping that BPF CI can prove my point, but it failed to
build your newly added xdp_hw_metadata.c test.