diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2018-07-30 15:30:43 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-30 19:31:13 +0300 |
| commit | 7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0 (patch) | |
| tree | 6d839e231aeb7764681d03ef13732b0fd408ff72 /net/sched/act_sample.c | |
| parent | 802bfb19152c0fb4137c6ba72bcf042ee023e743 (diff) | |
| download | linux-7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0.tar.xz | |
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_sample.c')
| -rw-r--r-- | net/sched/act_sample.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c index 3079e7be5bde..2608ccc83e5e 100644 --- a/net/sched/act_sample.c +++ b/net/sched/act_sample.c @@ -140,8 +140,7 @@ static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a, bstats_cpu_update(this_cpu_ptr(s->common.cpu_bstats), skb); retval = READ_ONCE(s->tcf_action); - rcu_read_lock(); - psample_group = rcu_dereference(s->psample_group); + psample_group = rcu_dereference_bh(s->psample_group); /* randomly sample packets according to rate */ if (psample_group && (prandom_u32() % s->rate == 0)) { @@ -165,7 +164,6 @@ static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a, skb_pull(skb, skb->mac_len); } - rcu_read_unlock(); return retval; } |