netdev - Re: [PATCH bpf-next v5 07/17] bpf: XDP metadata RX kfuncs

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Date:   Thu, 22 Dec 2022 16:31:26 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        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, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 07/17] bpf: XDP metadata RX kfuncs

On 12/20/22 2:20 PM, Stanislav Fomichev wrote:
> diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
> index bafcb7a3ae6f..6d81b14361e3 100644
> --- a/kernel/bpf/core.c
> +++ b/kernel/bpf/core.c
> @@ -2097,6 +2097,14 @@ bool bpf_prog_map_compatible(struct bpf_map *map,
>   	if (fp->kprobe_override)
>   		return false;
>   
> +	/* XDP programs inserted into maps are not guaranteed to run on
> +	 * a particular netdev (and can run outside driver context entirely
> +	 * in the case of devmap and cpumap). Until device checks
> +	 * are implemented, prohibit adding dev-bound programs to program maps.
> +	 */
> +	if (bpf_prog_is_dev_bound(fp->aux))
> +		return false;
> +

There is a recent change in the same function in the bpf tree, commit 
1c123c567fb1. fyi.

[ ... ]

> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index fdfdcab4a59d..320451a0be3e 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -2081,6 +2081,22 @@ static struct btf *find_kfunc_desc_btf(struct bpf_verifier_env *env, s16 offset)
>   	return btf_vmlinux ?: ERR_PTR(-ENOENT);
>   }
>   
> +int bpf_dev_bound_kfunc_check(struct bpf_verifier_env *env,
> +			      struct bpf_prog_aux *prog_aux)

nit. Move the dev bound related function to offload.c. &env->log can be passed 
instead of env and then use bpf_log().


Others lgtm.