netdev - [PATCH net-next 0/4] inet: frags: fully use RCU

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Message-ID: <20250309173151.2863314-1-edumazet@google.com>
Date: Sun,  9 Mar 2025 17:31:47 +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: David Ahern <dsahern@...nel.org>, Simon Horman <horms@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/4] inet: frags: fully use RCU

While inet reassembly uses RCU, it is acquiring/releasing
a refcount on struct inet_frag_queue in fast path,
for no good reason.

This series is removing these refcount changes, by extending
RCU sections.

Eric Dumazet (4):
  inet: frags: add inet_frag_putn() helper
  ipv4: frags: remove ipq_put()
  inet: frags: change inet_frag_kill() to defer refcount updates
  inet: frags: save a pair of atomic operations in reassembly

 include/net/inet_frag.h                 |  6 ++--
 include/net/ipv6_frag.h                 |  5 +--
 net/ieee802154/6lowpan/reassembly.c     | 25 ++++++++-----
 net/ipv4/inet_fragment.c                | 31 ++++++++--------
 net/ipv4/ip_fragment.c                  | 48 ++++++++++---------------
 net/ipv6/netfilter/nf_conntrack_reasm.c | 27 ++++++++------
 net/ipv6/reassembly.c                   | 29 +++++++--------
 7 files changed, 88 insertions(+), 83 deletions(-)

-- 
2.49.0.rc0.332.g42c0ae87b1-goog