[PATCH 00/14] Modify action API for implementing lockless actions

Vlad Buslov
2018-05-14T14:27:37Z

Currently, all netlink protocol handlers for updating rules, actions and
qdiscs are protected with single global rtnl lock which removes any
possibility for parallelism. This patch set is a first step to remove
rtnl lock dependency from TC rules update path. It updates act API to
use atomic operations, rcu and spinlocks for fine-grained locking. It
also extend API with functions that are needed to update existing
actions for parallel execution.

Outline of changes:
- Change tc action to use atomic reference and bind counters, rcu
mechanism for cookie update.
- Extend action ops API with 'delete' function and 'unlocked' flag.
- Change action API to work with actions in lockless manner based on
primitives implemented in previous patches.
- Extend action API with new functions necessary to implement unlocked
actions.

Vlad Buslov (14):
net: sched: use rcu for action cookie update
net: sched: change type of reference and bind counters
net: sched: add 'delete' function to action ops
net: sched: implement unlocked action init API
net: sched: always take reference to action
net: sched: implement reference counted action release
net: sched: use reference counting action init
net: sched: account for temporary action reference
net: sched: don't release reference on action overwrite
net: sched: extend act API for lockless actions
net: core: add new/replace rate estimator lock parameter
net: sched: retry action check-insert on concurrent modification
net: sched: use unique idr insert function in unlocked actions
net: sched: implement delete for all actions

include/net/act_api.h | 16 ++-
include/net/gen_stats.h | 2 +
include/net/pkt_cls.h | 1 +
net/core/gen_estimator.c | 58 ++++++---
net/netfilter/xt_RATEEST.c | 2 +-
net/sched/act_api.c | 298 ++++++++++++++++++++++++++++++++-------------
net/sched/act_bpf.c | 33 +++--
net/sched/act_connmark.c | 29 +++--
net/sched/act_csum.c | 33 +++--
net/sched/act_gact.c | 30 +++--
net/sched/act_ife.c | 37 ++++--
net/sched/act_ipt.c | 41 +++++--
net/sched/act_mirred.c | 32 +++--
net/sched/act_nat.c | 29 +++--
net/sched/act_pedit.c | 30 +++--
net/sched/act_police.c | 35 ++++--
net/sched/act_sample.c | 33 +++--
net/sched/act_simple.c | 31 +++--
net/sched/act_skbedit.c | 30 +++--
net/sched/act_skbmod.c | 33 +++--
net/sched/act_tunnel_key.c | 34 ++++--
net/sched/act_vlan.c | 34 ++++--
net/sched/cls_api.c | 6 +-
net/sched/sch_api.c | 2 +
net/sched/sch_cbq.c | 4 +-
net/sched/sch_drr.c | 4 +-
net/sched/sch_hfsc.c | 4 +-
net/sched/sch_htb.c | 4 +-
net/sched/sch_qfq.c | 4 +-
29 files changed, 673 insertions(+), 256 deletions(-)

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2.7.5