netdev - [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST

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Message-ID: <20250904132554.2891227-1-edumazet@google.com>
Date: Thu,  4 Sep 2025 13:25:50 +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>, 
	Jamie Bainbridge <jamie.bainbridge@...il.com>, Abhishek Rawal <rawal.abhishek92@...il.com>, 
	netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST

Addition of ICMP6_MIB_RATELIMITHOST in commit d0941130c9351
("icmp: Add counters for rate limits") introduced a performance
drop in case of DOS (like receiving UDP packets
to closed ports).

Per netns ICMP6_MIB_RATELIMITHOST tracking uses per-cpu
storage and is enough, we do not need per-device and slow tracking
for this metric.

Eric Dumazet (3):
  ipv6: snmp: remove icmp6type2name[]
  ipv6: snmp: do not use SNMP_MIB_SENTINEL anymore
  ipv6: snmp: do not track per idev ICMP6_MIB_RATELIMITHOST

 include/net/ip.h | 11 ++++++
 net/ipv6/icmp.c  |  3 +-
 net/ipv6/proc.c  | 87 ++++++++++++++++++++++++++----------------------
 3 files changed, 60 insertions(+), 41 deletions(-)

-- 
2.51.0.338.gd7d06c2dae-goog