[ovs-dev] [PATCH 1/8] datapath: Sync OVS recursive loop counter with upstream.
Pravin B Shelar
pshelar at ovn.org
Mon Jul 18 02:24:02 UTC 2016
Signed-off-by: Pravin B Shelar <pshelar at ovn.org>
---
datapath/actions.c | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)
diff --git a/datapath/actions.c b/datapath/actions.c
index abf7e3b..3f2ba4c 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -78,9 +78,7 @@ struct action_fifo {
};
static struct action_fifo __percpu *action_fifos;
-#define EXEC_ACTIONS_LEVEL_LIMIT 4 /* limit used to detect packet
- * looping by the network stack
- */
+
static DEFINE_PER_CPU(int, exec_actions_level);
static void action_fifo_init(struct action_fifo *fifo)
@@ -1207,31 +1205,26 @@ int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
const struct sw_flow_actions *acts,
struct sw_flow_key *key)
{
- int level = this_cpu_read(exec_actions_level);
- int err;
-
- if (unlikely(level >= EXEC_ACTIONS_LEVEL_LIMIT)) {
- if (net_ratelimit())
- pr_warn("%s: packet loop detected, dropping.\n",
- ovs_dp_name(dp));
+ static const int ovs_recursion_limit = 4;
+ int err, level;
+ level = __this_cpu_inc_return(exec_actions_level);
+ if (unlikely(level > ovs_recursion_limit)) {
+ net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
+ ovs_dp_name(dp));
kfree_skb(skb);
- return -ELOOP;
+ err = -ENETDOWN;
+ goto out;
}
- this_cpu_inc(exec_actions_level);
err = do_execute_actions(dp, skb, key,
acts->actions, acts->actions_len);
- if (!level)
+ if (level == 1)
process_deferred_actions(dp);
- this_cpu_dec(exec_actions_level);
-
- /* This return status currently does not reflect the errors
- * encounted during deferred actions execution. Probably needs to
- * be fixed in the future.
- */
+out:
+ __this_cpu_dec(exec_actions_level);
return err;
}
--
1.8.3.1
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