netdev - Re: [PATCH v3,bpf-next] bpf: Don't redirect packets with invalid pkt

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Message-ID: <20220714213025.448faf8c@kernel.org>
Date:   Thu, 14 Jul 2022 21:30:25 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <hawk@...nel.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>, <sdf@...gle.com>,
        <bigeasy@...utronix.de>, <imagedong@...cent.com>,
        <petrm@...dia.com>, <arnd@...db.de>, <dsahern@...nel.org>,
        <talalahmad@...gle.com>, <keescook@...omium.org>,
        <haoluo@...gle.com>, <jolsa@...nel.org>, <weiyongjun1@...wei.com>,
        <yuehaibing@...wei.com>
Subject: Re: [PATCH v3,bpf-next] bpf: Don't redirect packets with invalid
 pkt_len

On Fri, 15 Jul 2022 11:22:33 +0800 Zhengchao Shao wrote:
> +#ifdef CONFIG_DEBUG_NET
> +	if (unlikely(!skb->len)) {
> +		pr_err("%s\n", __func__);
> +		skb_dump(KERN_ERR, skb, false);
> +		WARN_ON_ONCE(1);
> +	}

Is there a reason to open code WARN_ONCE() like that?

#ifdef CONFIG_DEBUG_NET
	if (WARN_ONCE(!skb->len, "%s\n", __func__))
		skb_dump(KERN_ERR, skb, false);

or

	if (IS_ENABLED(CONFIG_DEBUG_NET) &&
	    WARN_ONCE(!skb->len, "%s\n", __func__))
		skb_dump(KERN_ERR, skb, false);