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authorPaolo Abeni <pabeni@redhat.com>2018-07-30 14:30:43 +0200
committerDavid S. Miller <davem@davemloft.net>2018-07-30 09:31:13 -0700
commit7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0 (patch)
tree6d839e231aeb7764681d03ef13732b0fd408ff72 /include/net/sch_generic.h
parentnet/sched: user-space can't set unknown tcfa_action values (diff)
downloadwireguard-linux-7fd4b288ea6a3e45ad8afbcd5ec39554d57f1ae0.tar.xz
wireguard-linux-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 'include/net/sch_generic.h')
-rw-r--r--include/net/sch_generic.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index c5432362dc26..bcae181c1857 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -285,6 +285,8 @@ struct tcf_proto {
/* Fast access part */
struct tcf_proto __rcu *next;
void __rcu *root;
+
+ /* called under RCU BH lock*/
int (*classify)(struct sk_buff *,
const struct tcf_proto *,
struct tcf_result *);