linux-kernel - Re: [PATCH] Net:cache didn't flush when ipv6 rule changed

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Date: Tue, 27 Feb 2024 08:06:35 -0700
From: David Ahern <dsahern@...nel.org>
To: Lena Wang (王娜) <Lena.Wang@...iatek.com>,
 "davem@...emloft.net" <davem@...emloft.net>,
 "kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com"
 <pabeni@...hat.com>, "edumazet@...gle.com" <edumazet@...gle.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Shiming Cheng (成诗明) <Shiming.Cheng@...iatek.com>
Subject: Re: [PATCH] Net:cache didn't flush when ipv6 rule changed

On 2/26/24 6:11 AM, Lena Wang (王娜) wrote:

> diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
> index 7523c4baef35..bec2cf4436e1 100644
> --- a/net/ipv6/fib6_rules.c
> +++ b/net/ipv6/fib6_rules.c
> @@ -449,6 +449,15 @@ static size_t fib6_rule_nlmsg_payload(struct
> fib_rule *rule)
>                + nla_total_size(16); /* src */
>  }
> 
> +static void fib6_rule_flush_cache(struct fib_rules_ops *ops)
> +{
> +       struct net *net = ops->fro_net;
> +       if (!net)
> +               return;
> +       rt_genid_bump_ipv6(net);
> +       return;
> +}

This can be written as a 1-liner - the same way as the IPv4 flush cache:

static void fib6_rule_flush_cache(struct fib_rules_ops *ops)
{
	rt_genid_bump_ipv6(ops->fro_net);
}


> +
>  static const struct fib_rules_ops __net_initconst
> fib6_rules_ops_template = {
>         .family                 = AF_INET6,
>         .rule_size              = sizeof(struct fib6_rule),
> @@ -461,6 +470,7 @@ static const struct fib_rules_ops __net_initconst
> fib6_rules_ops_template = {
>         .compare                = fib6_rule_compare,
>         .fill                   = fib6_rule_fill,
>         .nlmsg_payload          = fib6_rule_nlmsg_payload,
> +       .flush_cache    = fib6_rule_flush_cache,

this should be tabs and the columns should align with existing code.



>         .nlgroup                = RTNLGRP_IPV6_RULE,
>         .owner                  = THIS_MODULE,
>         .fro_net                = &init_net,
> --
> 2.18.0