openmptcprouter/root/target/linux/generic/hack-5.4/953-net-patch-linux-kernel-to-support-shortcut-fe.patch

--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -52,6 +52,9 @@ struct br_ip_list {
 
 extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
 
+extern void br_dev_update_stats(struct net_device *dev,
+				struct rtnl_link_stats64 *nlstats);
+
 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
 int br_multicast_list_adjacent(struct net_device *dev,
 			       struct list_head *br_ip_list);
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -826,6 +826,10 @@ struct sk_buff {
 #endif
 	__u8			gro_skip:1;
 
+#ifdef CONFIG_SHORTCUT_FE
+	__u16			fast_forwarded:1;
+#endif
+
 #ifdef CONFIG_NET_SCHED
 	__u16			tc_index;	/* traffic control index */
 #endif
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -18,6 +18,10 @@ struct timer_list {
 	void			(*function)(struct timer_list *);
 	u32			flags;
 
+#ifdef CONFIG_SHORTCUT_FE
+	unsigned long		cust_data;
+#endif
+
 #ifdef CONFIG_LOCKDEP
 	struct lockdep_map	lockdep_map;
 #endif
--- a/include/net/netfilter/nf_conntrack_ecache.h
+++ b/include/net/netfilter/nf_conntrack_ecache.h
@@ -75,6 +75,8 @@ struct nf_ct_event {
 #ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
 extern int nf_conntrack_register_notifier(struct net *net, struct notifier_block *nb);
 extern int nf_conntrack_unregister_notifier(struct net *net, struct notifier_block *nb);
+extern int nf_conntrack_register_chain_notifier(struct net *net, struct notifier_block *nb);
+extern int nf_conntrack_unregister_chain_notifier(struct net *net, struct notifier_block *nb);
 #else
 struct nf_ct_event_notifier {
 	int (*fcn)(unsigned int events, struct nf_ct_event *item);
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -746,6 +746,28 @@ void br_port_flags_change(struct net_bri
 		br_recalculate_neigh_suppress_enabled(br);
 }
 
+void br_dev_update_stats(struct net_device *dev,
+			 struct rtnl_link_stats64 *nlstats)
+{
+	struct net_bridge *br;
+	struct pcpu_sw_netstats *stats;
+
+	/* Is this a bridge? */
+	if (!(dev->priv_flags & IFF_EBRIDGE))
+		return;
+
+	br = netdev_priv(dev);
+	stats = this_cpu_ptr(br->stats);
+
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_packets += nlstats->rx_packets;
+	stats->rx_bytes += nlstats->rx_bytes;
+	stats->tx_packets += nlstats->tx_packets;
+	stats->tx_bytes += nlstats->tx_bytes;
+	u64_stats_update_end(&stats->syncp);
+}
+EXPORT_SYMBOL_GPL(br_dev_update_stats);
+
 bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag)
 {
 	struct net_bridge_port *p;
 
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3189,8 +3189,17 @@ static int xmit_one(struct sk_buff *skb, struct net_device *dev,
 	unsigned int len;
 	int rc;
 
+#ifdef CONFIG_SHORTCUT_FE
+	/* If this skb has been fast forwarded then we don't want it to
+	 * go to any taps (by definition we're trying to bypass them).
+	 */
+	if (!skb->fast_forwarded) {
+#endif
 	if (dev_nit_active(dev))
 		dev_queue_xmit_nit(skb, dev);
+#ifdef CONFIG_SHORTCUT_FE
+	}
+#endif
 
 #ifdef CONFIG_ETHERNET_PACKET_MANGLE
 	if (!dev->eth_mangle_tx ||
@@ -4683,6 +4691,11 @@ void netdev_rx_handler_unregister(struct
 }
 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
 
+#ifdef CONFIG_SHORTCUT_FE
+int (*athrs_fast_nat_recv)(struct sk_buff *skb) __rcu __read_mostly;
+EXPORT_SYMBOL_GPL(athrs_fast_nat_recv);
+#endif
+
 /*
  * Limit the use of PFMEMALLOC reserves to those protocols that implement
  * the special handling of PFMEMALLOC skbs.
@@ -4733,6 +4746,10 @@ static int __netif_receive_skb_core(stru
 	int ret = NET_RX_DROP;
 	__be16 type;
 
+#ifdef CONFIG_SHORTCUT_FE
+	int (*fast_recv)(struct sk_buff *skb);
+#endif
+
 	net_timestamp_check(!netdev_tstamp_prequeue, skb);
 
 	trace_netif_receive_skb(skb);
@@ -4772,6 +4789,16 @@ another_round:
 			goto out;
 	}
 
+#ifdef CONFIG_SHORTCUT_FE
+	fast_recv = rcu_dereference(athrs_fast_nat_recv);
+	if (fast_recv) {
+		if (fast_recv(skb)) {
+			ret = NET_RX_SUCCESS;
+			goto out;
+		}
+	}
+#endif
+
 	if (skb_skip_tc_classify(skb))
 		goto skip_classify;
 
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -473,3 +473,6 @@ config HAVE_CBPF_JIT
 # Extended BPF JIT (eBPF)
 config HAVE_EBPF_JIT
 	bool
+
+config SHORTCUT_FE
+	bool "Enables kernel network stack path for Shortcut  Forwarding Engine
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -34,11 +34,19 @@
 /* Do not check the TCP window for incoming packets  */
 static int nf_ct_tcp_no_window_check __read_mostly = 1;
 
+#ifdef CONFIG_SHORTCUT_FE
+EXPORT_SYMBOL_GPL(nf_ct_tcp_no_window_check);
+#endif
+
 /* "Be conservative in what you do,
     be liberal in what you accept from others."
     If it's non-zero, we mark only out of window RST segments as INVALID. */
 static int nf_ct_tcp_be_liberal __read_mostly = 0;
 
+#ifdef CONFIG_SHORTCUT_FE
+EXPORT_SYMBOL_GPL(nf_ct_tcp_be_liberal);
+#endif
+
 /* If it is set to zero, we disable picking up already established
    connections. */
 static int nf_ct_tcp_loose __read_mostly = 1;
--- a/net/netfilter/nf_conntrack_ecache.c
+++ b/net/netfilter/nf_conntrack_ecache.c
@@ -162,7 +162,11 @@ int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
 
 	rcu_read_lock();
 	notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	if (!notify && !rcu_dereference_raw(net->ct.nf_conntrack_chain.head))
+#else
 	if (!notify)
+#endif
 		goto out_unlock;
 
 	e = nf_ct_ecache_find(ct);
@@ -181,7 +185,14 @@ int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
 		if (!((eventmask | missed) & e->ctmask))
 			goto out_unlock;
 
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+		ret = atomic_notifier_call_chain(&net->ct.nf_conntrack_chain,
+			eventmask | missed, &item);
+		if (notify)
+			ret = notify->fcn(eventmask | missed, &item);
+#else
 		ret = notify->fcn(eventmask | missed, &item);
+#endif
 		if (unlikely(ret < 0 || missed)) {
 			spin_lock_bh(&ct->lock);
 			if (ret < 0) {
@@ -263,7 +274,11 @@ void nf_ct_deliver_cached_events(struct nf_conn *ct)
 
 	rcu_read_lock();
 	notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	if ((notify == NULL) && !rcu_dereference_raw(net->ct.nf_conntrack_chain.head))
+#else
 	if (notify == NULL)
+#endif
 		goto out_unlock;
 
 	e = nf_ct_ecache_find(ct);
@@ -287,7 +302,15 @@ void nf_ct_deliver_cached_events(struct nf_conn *ct)
 	item.portid = 0;
 	item.report = 0;
 
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	ret = atomic_notifier_call_chain(&net->ct.nf_conntrack_chain,
+			events | missed,
+			&item);
+	if (notify != NULL)
+		ret = notify->fcn(events | missed, &item);
+#else
 	ret = notify->fcn(events | missed, &item);
+#endif
 
 	if (likely(ret == 0 && !missed))
 		goto out_unlock;
@@ -340,6 +363,11 @@ int nf_conntrack_register_notifier(struct net *net, struct notifier_block *nb)
 {
 	return atomic_notifier_chain_register(&net->ct.nf_conntrack_chain, nb);
 }
+int nf_conntrack_register_chain_notifier(struct net *net, struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&net->ct.nf_conntrack_chain, nb);
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_register_chain_notifier);
 #else
 int nf_conntrack_register_notifier(struct net *net,
 				   struct nf_ct_event_notifier *new)
@@ -369,6 +397,11 @@ int nf_conntrack_unregister_notifier(struct net *net, struct notifier_block *nb)
 {
 	return atomic_notifier_chain_unregister(&net->ct.nf_conntrack_chain, nb);
 }
+int nf_conntrack_unregister_chain_notifier(struct net *net, struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&net->ct.nf_conntrack_chain, nb);
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_unregister_chain_notifier);
 #else
 void nf_conntrack_unregister_notifier(struct net *net,
 				      struct nf_ct_event_notifier *new)