netdev - Re: [PATCH net-next v2 2/2] bpf: let bpf_warn_invalid_xdp

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Message-ID: <20211126101941.029e1d7f@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 26 Nov 2021 10:19:41 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, bpf@...r.kernel.org,
        Toke Høiland-Jørgensen 
        <toke@...hat.com>
Subject: Re: [PATCH net-next v2 2/2] bpf: let bpf_warn_invalid_xdp_action()
 report more info

On Fri, 26 Nov 2021 12:19:11 +0100 Paolo Abeni wrote:
> -void bpf_warn_invalid_xdp_action(u32 act)
> +void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act)
>  {
>  	const u32 act_max = XDP_REDIRECT;
>  
> -	pr_warn_once("%s XDP return value %u, expect packet loss!\n",
> +	pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n",
>  		     act > act_max ? "Illegal" : "Driver unsupported",
> -		     act);
> +		     act, prog->aux->name, prog->aux->id, dev->name ? dev->name : "");
>  }

Since we have to touch all the drivers each time the prototype of this
function is changed - would it make sense to pass in rxq instead? It has
more info which may become useful at some point.