netdev - Re: [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg

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Message-ID: <ab973374-88cd-4b06-986f-56393b32ce06@huawei.com>
Date: Tue, 26 Aug 2025 21:32:34 +0800
From: Yue Haibing <yuehaibing@...wei.com>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <horms@...nel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] ipv6: annotate data-races around
 devconf->rpl_seg_enabled

On 2025/8/26 11:17, Kuniyuki Iwashima wrote:
> On Mon, Aug 25, 2025 at 7:51 PM Yue Haibing <yuehaibing@...wei.com> wrote:
>>
>> devconf->rpl_seg_enabled can be changed concurrently from
>> /proc/sys/net/ipv6/conf, annotate lockless reads on it.
>>
>> Signed-off-by: Yue Haibing <yuehaibing@...wei.com>
>> ---
>>  net/ipv6/exthdrs.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
>> index d1ef9644f826..a23eb8734e15 100644
>> --- a/net/ipv6/exthdrs.c
>> +++ b/net/ipv6/exthdrs.c
>> @@ -494,10 +494,8 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb)
>>
>>         idev = __in6_dev_get(skb->dev);
>>
>> -       accept_rpl_seg = net->ipv6.devconf_all->rpl_seg_enabled;
>> -       if (accept_rpl_seg > idev->cnf.rpl_seg_enabled)
>> -               accept_rpl_seg = idev->cnf.rpl_seg_enabled;
>> -
>> +       accept_rpl_seg = min(READ_ONCE(net->ipv6.devconf_all->rpl_seg_enabled),
>> +                            READ_ONCE(idev->cnf.rpl_seg_enabled));
>>         if (!accept_rpl_seg) {
> 
> Orthogonal to this change, but rpl_seg_enabled is missing .extra1/2
> or this condition should be adjusted like other knobs that recognises
>  <0 as disabled, .e.g. keep_addr_on_down, etc.

Thanks, will add .extra1/2 check for this in v2.

> 
> 
>>                 kfree_skb(skb);
>>                 return -1;
>> --
>> 2.34.1
>>
>