netdev - Re: [PATCH v10] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

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Date:   Thu, 27 Jan 2022 18:47:22 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sun Shouxin <sunshouxin@...natelecom.cn>
Cc:     j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jay.vosburgh@...onical.com,
        nikolay@...dia.com, huyd12@...natelecom.cn
Subject: Re: [PATCH v10] net: bonding: Add support for IPV6 ns/na to
 balance-alb/balance-tlb mode

On Tue, 25 Jan 2022 09:24:18 -0500 Sun Shouxin wrote:
> +/* determine if the packet is NA or NS */
> +static bool __alb_determine_nd(struct icmp6hdr *hdr)
> +{
> +	if (hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
> +	    hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
> +		return true;
> +	}
> +
> +	return false;
> +}
> +
> +static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
> +{
> +	struct ipv6hdr *ip6hdr;
> +	struct icmp6hdr *hdr;
> +
> +	if (!pskb_network_may_pull(skb, sizeof(*ip6hdr)))
> +		return true;
> +
> +	ip6hdr = ipv6_hdr(skb);
> +	if (ip6hdr->nexthdr == IPPROTO_ICMPV6) {

	if (ip6hdr->nexthdr != IPPROTO_ICMPV6)
		return false;

This way there's no need to indent the rest of the function.

> +		if (!pskb_may_pull(skb, sizeof(*ip6hdr) + sizeof(*hdr)))

What happened to the _network part? pskb_network_may_pull(), right?

> +			return true;
> +
> +		hdr = icmp6_hdr(skb);
> +		return __alb_determine_nd(hdr);

Why create a full helper for this condition? Why not just:

	return hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
	       hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION;


> +	}
> +
> +	return false;
> +}