netdev - Re: [PATCH bpf-next,v3 2/4] xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF

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Message-ID: <5cac050a-d67b-587f-411e-946117ba8324@linux.dev>
Date:   Thu, 1 Dec 2022 23:40:20 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Eyal Birger <eyal.birger@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        andrii@...nel.org, daniel@...earbox.net, nicolas.dichtel@...nd.com,
        razor@...ckwall.org, mykolal@...com, ast@...nel.org,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, shuah@...nel.org, liuhangbin@...il.com,
        lixiaoyan@...gle.com
Subject: Re: [PATCH bpf-next,v3 2/4] xfrm: interface: Add unstable helpers for
 setting/getting XFRM metadata from TC-BPF

On 12/1/22 1:14 PM, Eyal Birger wrote:
> +int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx, struct bpf_xfrm_info *to)
> +{
> +	struct sk_buff *skb = (struct sk_buff *)skb_ctx;
> +	struct xfrm_md_info *info;
> +
> +	memset(to, 0, sizeof(*to));

This zero-ing is also not needed.  verifier ensures "to" is initialized before 
calling this kfunc.

> +
> +	info = skb_xfrm_md_info(skb);
> +	if (!info)
> +		return -EINVAL;
> +
> +	to->if_id = info->if_id;
> +	to->link = info->link;
> +	return 0;
> +}