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| author |   Paolo Abeni <pabeni@redhat.com> | 2018-07-30 14:30:43 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-07-30 09:31:13 -0700 |
| commit | 7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0 (patch) | |
| tree | 6d839e231aeb7764681d03ef13732b0fd408ff72 /net/sched/act_tunnel_key.c | |
| parent | net/sched: user-space can't set unknown tcfa_action values (diff) | |
| download | linux-dev-7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0.tar.xz linux-dev-7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0.zip | |
tc/act: remove unneeded RCU lock in action callback
Each lockless action currently does its own RCU locking in ->act().
This allows using plain RCU accessor, even if the context
is really RCU BH.
This change drops the per action RCU lock, replace the accessors
with the _bh variant, cleans up a bit the surrounding code and
documents the RCU status in the relevant header.
No functional nor performance change is intended.
The goal of this patch is clarifying that the RCU critical section
used by the tc actions extends up to the classifier's caller.
v1 -> v2:
- preserve rcu lock in act_bpf: it's needed by eBPF helpers,
as pointed out by Daniel
v3 -> v4:
- fixed some typos in the commit message (JiriP)
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_tunnel_key.c')
| -rw-r--r-- | net/sched/act_tunnel_key.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c index f811850fd1d0..d42d9e112789 100644 --- a/net/sched/act_tunnel_key.c +++ b/net/sched/act_tunnel_key.c @@ -31,9 +31,7 @@ static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a, struct tcf_tunnel_key_params *params; int action; - rcu_read_lock(); - - params = rcu_dereference(t->params); + params = rcu_dereference_bh(t->params); tcf_lastuse_update(&t->tcf_tm); bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb); @@ -53,8 +51,6 @@ static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a, break; } - rcu_read_unlock(); - return action; } |