[PATCH net-next v9 0/3] net_sched actions: act_vlan now uses RCU

[PATCH net-next v9 0/3] net_sched actions: act_vlan now uses RCU

[Manish Kurup]

This commit consists of 3 patches:

patch1 (1/3):
The VLAN action maintains one set of stats across all cores, and uses a
spinlock to synchronize updates to it from the same. Changed this to use a
per-CPU stats context instead.
This change will result in better performance.

patch2 (2/3):
Modified netronome nfp flower action to use VLAN helper functions instead
of accessing/referencing TC act_vlan private structures directly. 

patch3 (3/3):
Using a spinlock in the VLAN action causes performance issues when the VLAN
action is used on multiple cores. Rewrote the VLAN action to use RCU read
locking for reads and updates instead.
All functions now use an RCU dereferenced pointer to access the VLAN action
context. Modified helper functions used by other modules, to use the RCU as
opposed to directly accessing the structure.

As part of this review, there were some changes suggested by reviewers.
I have incorporated all the changes that were requested.

Here're the changes:
v2: Fixed all helper functions to use RCU (rtnl_dereference) - Eric, Jamal
v2: Fixed indentation, extra line nits - Jamal, Jiri
v2: Moved rcu_head to the end of the struct - Jiri
v2: Re-formatted locals to reverse-christmas-tree - Jiri
v2: Removed mismatched spin_lock() - Cong
v2: Removed spin_lock_bh() in tcf_vlan_init, rtnl_dereference() should
    suffice - Cong, Jiri
v4: Modified the nfp flower action code to use the VLAN helper functions
    instead of referencing the structure directly. Isolated this into a
    separate patch - Pieter Jansen
v5: Got rid of the unlikely() for the allocation case - Simon Horman
v6: Had forgotten cleanup functions for RCU alloc, added them - Dave Miller
v7: Re-formatted more locals to reverse-christmas-tree - Pieter V
v8: Reverted reverse-christmas-tree(v7), not required when dependencies
    make it difficult to implement - Alexander D
v9: Cover letter subject change - Jamal

Reviewed-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Manish Kurup <manish.kurup@verizon.com>

Manish Kurup (3):
  act_vlan: Change stats update to use per-core stats
  nfp flower action: Modified to use VLAN helper functions
  act_vlan: VLAN action rewrite to use RCU lock/unlock and update

 drivers/net/ethernet/netronome/nfp/flower/action.c |  5 +-
 include/net/tc_act/tc_vlan.h                       | 46 +++++++++---
 net/sched/act_vlan.c                               | 81 +++++++++++++++-------
 3 files changed, 94 insertions(+), 38 deletions(-)

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2.7.4