netdev - [PATCH net-next 1/8] ipv6: add sysctl_ipv6

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Message-ID: <20260115094141.3124990-2-edumazet@google.com>
Date: Thu, 15 Jan 2026 09:41:34 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/8] ipv6: add sysctl_ipv6_flowlabel group

Group together following struct netns_sysctl_ipv6 fields:

- flowlabel_consistency
- auto_flowlabels
- flowlabel_state_ranges

After this patch, ip6_make_flowlabel() uses a single cache line to fetch
auto_flowlabels and flowlabel_state_ranges (instead of two before the patch).

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/netns/ipv6.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 08d2ecc96e2b43901af6d91ae06d555b5ae9298d..34bdb1308e8ff85f04130ed25f40a4f8a24db083 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -30,19 +30,23 @@ struct netns_sysctl_ipv6 {
 	int ip6_rt_min_advmss;
 	u32 multipath_hash_fields;
 	u8 multipath_hash_policy;
-	u8 bindv6only;
+
+	__cacheline_group_begin(sysctl_ipv6_flowlabel);
 	u8 flowlabel_consistency;
 	u8 auto_flowlabels;
-	int icmpv6_time;
+	u8 flowlabel_state_ranges;
+	__cacheline_group_end(sysctl_ipv6_flowlabel);
+
 	u8 icmpv6_echo_ignore_all;
 	u8 icmpv6_echo_ignore_multicast;
 	u8 icmpv6_echo_ignore_anycast;
+	int icmpv6_time;
 	DECLARE_BITMAP(icmpv6_ratemask, ICMPV6_MSG_MAX + 1);
 	unsigned long *icmpv6_ratemask_ptr;
 	u8 anycast_src_echo_reply;
+	u8 bindv6only;
 	u8 ip_nonlocal_bind;
 	u8 fwmark_reflect;
-	u8 flowlabel_state_ranges;
 	int idgen_retries;
 	int idgen_delay;
 	int flowlabel_reflect;
-- 
2.52.0.457.g6b5491de43-goog