linux-kernel - Re: [PATCH net-next] rtnetlink: honor RTEXT_FILTER_SKIP_STATS in IFLA

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Message-ID: <6a2072e1-43be-49a3-b612-d6e2714ec63e@6wind.com>
Date: Thu, 23 Oct 2025 17:39:09 +0200
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: Adrian Moreno <amorenoz@...hat.com>, netdev@...r.kernel.org
Cc: toke@...hat.com, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, Stanislav Fomichev <sdf@...ichev.me>,
 Xiao Liang <shaw.leon@...il.com>, Cong Wang <cong.wang@...edance.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] rtnetlink: honor RTEXT_FILTER_SKIP_STATS in
 IFLA_STATS

Le 23/10/2025 à 10:34, Adrian Moreno a écrit :
> Gathering interface statistics can be a relatively expensive operation
> on certain systems as it requires iterating over all the cpus.
> 
> RTEXT_FILTER_SKIP_STATS was first introduced [1] to skip AF_INET6
> statistics from interface dumps and it was then extended [2] to
> also exclude IFLA_VF_INFO.
> 
> The semantics of the flag does not seem to be limited to AF_INET
> or VF statistics and having a way to query the interface status
> (e.g: carrier, address) without retrieving its statistics seems
> reasonable. So this patch extends the use RTEXT_FILTER_SKIP_STATS
> to also affect IFLA_STATS.
> 
> [1] https://lore.kernel.org/all/20150911204848.GC9687@oracle.com/
> [2] https://lore.kernel.org/all/20230611105108.122586-1-gal@nvidia.com/
> 
> Signed-off-by: Adrian Moreno <amorenoz@...hat.com>
> ---
>  net/core/rtnetlink.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 8040ff7c356e..88d52157ef1c 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2123,7 +2123,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
>  	if (rtnl_phys_switch_id_fill(skb, dev))
>  		goto nla_put_failure;
>  
> -	if (rtnl_fill_stats(skb, dev))
> +	if (~ext_filter_mask & RTEXT_FILTER_SKIP_STATS &&
Maybe parentheses around this first condition?

The size could be adjusted accordingly in if_nlmsg_size().

> +	    rtnl_fill_stats(skb, dev))
>  		goto nla_put_failure;
>  
>  	if (rtnl_fill_vf(skb, dev, ext_filter_mask))