netdev - [PATCH net-next 00/18] net: Cover more per-CPU storage with local nested BH locking.

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Message-ID: <20250309144653.825351-1-bigeasy@linutronix.de>
Date: Sun,  9 Mar 2025 15:46:35 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: netdev@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Cc: "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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH net-next 00/18] net: Cover more per-CPU storage with local nested BH locking.

I was looking at the build-time defined per-CPU variables in net/ and
added the needed local-BH-locks in order to be able to remove the
current per-CPU lock in local_bh_disable() on PREMPT_RT.

The work is not yet complete, I just wanted to post what I have so far
instead of sitting on it.

Sebastian

Sebastian Andrzej Siewior (18):
  net: page_pool: Don't recycle into cache on PREEMPT_RT.
  net: dst_cache: Use nested-BH locking for dst_cache::cache.
  ipv4/route: Use this_cpu_inc() for stats on PREEMPT_RT.
  ipv6: sr: Use nested-BH locking for hmac_storage.
  xdp: Use nested-BH locking for system_page_pool.
  netfilter: nf_dup{4, 6}: Move duplication check to task_struct.
  netfilter: nft_inner: Use nested-BH locking for nft_pcpu_tun_ctx.
  netfilter: nf_dup_netdev: Move the recursion counter struct
    netdev_xmit.
  xfrm: Use nested-BH locking for nat_keepalive_sk_ipv[46].
  openvswitch: Merge three per-CPU structures into one.
  openvswitch: Use nested-BH locking for ovs_actions.
  openvswitch: Move ovs_frag_data_storage into the struct ovs_action.
  net/sched: act_mirred: Move the recursion counter struct netdev_xmit.
  net/sched: Use nested-BH locking for sch_frag_data_storage.
  mptcp: Use nested-BH locking for hmac_storage.
  rds: Disable only bottom halves in rds_page_remainder_alloc().
  rds: Acquire per-CPU pointer within BH disabled section.
  rds: Use nested-BH locking for rds_page_remainder.

 include/linux/netdevice.h        |  7 +++-
 include/linux/netdevice_xmit.h   |  6 +++
 include/linux/netfilter.h        | 11 -----
 include/linux/sched.h            |  1 +
 net/core/dev.c                   | 15 ++++---
 net/core/dst_cache.c             | 30 ++++++++++++--
 net/core/page_pool.c             |  4 ++
 net/core/xdp.c                   | 11 ++++-
 net/ipv4/netfilter/ip_tables.c   |  2 +-
 net/ipv4/netfilter/nf_dup_ipv4.c |  6 +--
 net/ipv4/route.c                 |  4 ++
 net/ipv6/netfilter/ip6_tables.c  |  2 +-
 net/ipv6/netfilter/nf_dup_ipv6.c |  6 +--
 net/ipv6/seg6_hmac.c             | 13 +++++-
 net/mptcp/protocol.c             |  4 +-
 net/mptcp/protocol.h             |  9 ++++-
 net/netfilter/core.c             |  3 --
 net/netfilter/nf_dup_netdev.c    | 22 ++++++++--
 net/netfilter/nft_inner.c        | 18 +++++++--
 net/openvswitch/actions.c        | 69 +++++++++++++++-----------------
 net/openvswitch/datapath.c       |  9 +----
 net/openvswitch/datapath.h       |  3 --
 net/rds/page.c                   | 25 +++++++-----
 net/sched/act_mirred.c           | 28 +++++++++++--
 net/sched/sch_frag.c             | 10 ++++-
 net/xfrm/xfrm_nat_keepalive.c    | 30 +++++++++-----
 26 files changed, 231 insertions(+), 117 deletions(-)

-- 
2.47.2