shortcut-fe(SFE): backport NF_CONNTRACK_CHAIN_EVENTS (hanwckf#515)

* kernel: netfilter: Introduce NF_CONNTRACK_CHAIN_EVENTS (Backport from chromiumos 3.18 (114594778f3a8a22f1c98f70aef74b778329da3f) & lede patchs)

* kernel:config add CONFIG_ NF_CONNTRACK_CHAIN_EVENTS

New symbols c7116ad
net: conntrack events, support multiple registrant
Register multiple callbacks to ct events (NF_CONNTRACK_CHAIN_EVENTS)

* shortcut-fe(SFE):enable CONFIG_NF_CONNTRACK_CHAIN_EVENTS at compile SFE

* shortcut-fe(SFE):fix

* shortcut-fe(SFE):fix

* kernel:net:revert something

* ecache:fix

Co-authored-by: Alexey <4653240-dm38@users.noreply.gitlab.com>

trunk/user/shortcut-fe/shortcut-fe/fast-classifier.c

@@ -1787,8 +1787,8 @@ static int __init fast_classifier_init(void)
 	/*
 	 * Hook the receive path in the network stack.
 	 */
-	BUG_ON(fast_nat_recv);
-	RCU_INIT_POINTER(fast_nat_recv, fast_classifier_recv);
+	BUG_ON(athrs_fast_nat_recv);
+	RCU_INIT_POINTER(athrs_fast_nat_recv, fast_classifier_recv);
 
 	/*
 	 * Hook the shortcut sync callback.
@@ -1846,7 +1846,7 @@ static void __exit fast_classifier_exit(void)
 	/*
 	 * Unregister our receive callback.
 	 */
-	RCU_INIT_POINTER(fast_nat_recv, NULL);
+	RCU_INIT_POINTER(athrs_fast_nat_recv, NULL);
 
 	/*
 	 * Wait for all callbacks to complete.
@@ -1889,4 +1889,3 @@ module_exit(fast_classifier_exit)
 
 MODULE_DESCRIPTION("Shortcut Forwarding Engine - Connection Manager");
 MODULE_LICENSE("Dual BSD/GPL");
-