* [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled
@ 2025-08-26 2:52 Yue Haibing
2025-08-26 3:17 ` Kuniyuki Iwashima
0 siblings, 1 reply; 3+ messages in thread
From: Yue Haibing @ 2025-08-26 2:52 UTC (permalink / raw)
To: davem, dsahern, edumazet, kuba, pabeni, horms, kuniyu
Cc: netdev, linux-kernel, yuehaibing
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@huawei.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) {
kfree_skb(skb);
return -1;
--
2.34.1
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled
2025-08-26 2:52 [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled Yue Haibing
@ 2025-08-26 3:17 ` Kuniyuki Iwashima
2025-08-26 13:32 ` Yue Haibing
0 siblings, 1 reply; 3+ messages in thread
From: Kuniyuki Iwashima @ 2025-08-26 3:17 UTC (permalink / raw)
To: Yue Haibing
Cc: davem, dsahern, edumazet, kuba, pabeni, horms, netdev, linux-kernel
On Mon, Aug 25, 2025 at 7:51 PM Yue Haibing <yuehaibing@huawei.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@huawei.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.
> kfree_skb(skb);
> return -1;
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled
2025-08-26 3:17 ` Kuniyuki Iwashima
@ 2025-08-26 13:32 ` Yue Haibing
0 siblings, 0 replies; 3+ messages in thread
From: Yue Haibing @ 2025-08-26 13:32 UTC (permalink / raw)
To: Kuniyuki Iwashima
Cc: davem, dsahern, edumazet, kuba, pabeni, horms, netdev, linux-kernel
On 2025/8/26 11:17, Kuniyuki Iwashima wrote:
> On Mon, Aug 25, 2025 at 7:51 PM Yue Haibing <yuehaibing@huawei.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@huawei.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
>>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2025-08-26 13:32 UTC | newest]
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2025-08-26 2:52 [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled Yue Haibing
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2025-08-26 13:32 ` Yue Haibing
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