netdev - Re: [PATCH bpf-next v6 05/17] bpf: Introduce device-bound XDP programs

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Date:   Thu, 5 Jan 2023 16:41:01 -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 v6 05/17] bpf: Introduce device-bound XDP
 programs

On 1/4/23 1:59 PM, Stanislav Fomichev wrote:
> @@ -199,12 +197,12 @@ int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
>   	    attr->prog_type != BPF_PROG_TYPE_XDP)
>   		return -EINVAL;
>   
> -	if (attr->prog_flags)
> +	if (attr->prog_flags & ~BPF_F_XDP_DEV_BOUND_ONLY)
>   		return -EINVAL;
>   
> -	offload = kzalloc(sizeof(*offload), GFP_USER);

The kzalloc is still needed. Although a latter patch added it bad, it is better 
not to miss it in the first place.

> -	if (!offload)
> -		return -ENOMEM;
> +	if (attr->prog_type == BPF_PROG_TYPE_SCHED_CLS &&
> +	    attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY)
> +		return -EINVAL;
>   
>   	offload->prog = prog;
>