linux-kernel - Re: [PATCH bpf-next v4 1/2] bpf, xdp: Add tracepoint to xdp attaching failure

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Date:   Mon, 31 Jul 2023 19:43:36 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Hwang <hffilwlqm@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, hawk@...nel.org,
        rostedt@...dmis.org, mhiramat@...nel.org, mykolal@...com,
        shuah@...nel.org, tangyeechou@...il.com, kernel-patches-bot@...com,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 1/2] bpf, xdp: Add tracepoint to xdp
 attaching failure

On Sun, 30 Jul 2023 19:49:50 +0800 Leon Hwang wrote:
> @@ -9472,6 +9473,7 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
>  	struct bpf_link_primer link_primer;
>  	struct bpf_xdp_link *link;
>  	struct net_device *dev;
> +	struct netlink_ext_ack extack;

This is not initialized. Also, while fixing that, move it up 
to maintain the line order by decreasing line length.

>  	int err, fd;
>  
>  	rtnl_lock();
> @@ -9497,12 +9499,13 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
>  		goto unlock;
>  	}
>  
> -	err = dev_xdp_attach_link(dev, NULL, link);
> +	err = dev_xdp_attach_link(dev, &extack, link);
>  	rtnl_unlock();
>  
>  	if (err) {
>  		link->dev = NULL;
>  		bpf_link_cleanup(&link_primer);
> +		trace_bpf_xdp_link_attach_failed(extack._msg);