lede/target/linux/generic/hack-5.4/999-shortcut-fe-support.patch

--- a/include/linux/if_bridge.h	2020-06-22 00:31:27.000000000 -0700
+++ b/include/linux/if_bridge.h	2020-06-27 18:17:02.739634872 -0700
@@ -51,7 +51,8 @@ struct br_ip_list {
 #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
 
 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	2020-06-23 11:43:45.724010000 -0700
+++ b/include/linux/skbuff.h	2020-06-27 18:16:21.428010018 -0700
@@ -825,6 +825,9 @@ struct sk_buff {
 	__u8			decrypted:1;
 #endif
 	__u8			gro_skip:1;
+#ifdef CONFIG_SHORTCUT_FE
+	__u8			fast_forwarded:1;
+#endif
 
 #ifdef CONFIG_NET_SCHED
 	__u16			tc_index;	/* traffic control index */

--- a/include/linux/timer.h	2020-06-22 00:31:27.000000000 -0700
+++ b/include/linux/timer.h	2020-06-27 18:23:29.015910189 -0700
@@ -17,7 +17,9 @@ struct timer_list {
 	unsigned long		expires;
 	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/netns/conntrack.h	2020-06-23 11:43:45.752009000 -0700
+++ b/include/net/netns/conntrack.h	2020-06-27 18:18:26.138861119 -0700
@@ -115,8 +115,12 @@ struct netns_ct {
 #ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
 	struct atomic_notifier_head nf_conntrack_chain;
 #else
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	struct atomic_notifier_head nf_conntrack_chain;
+#else
 	struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
 #endif
+#endif
 	struct nf_exp_event_notifier __rcu *nf_expect_event_cb;
 	struct nf_ip_net	nf_ct_proto;
 #if defined(CONFIG_NF_CONNTRACK_LABELS)

--- a/net/bridge/br_if.c	2020-06-22 00:31:27.000000000 -0700
+++ b/net/bridge/br_if.c	2020-06-27 18:31:59.765638309 -0700
@@ -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	2020-06-23 11:43:45.728009000 -0700
+++ b/net/core/dev.c	2020-06-27 18:27:40.161351260 -0700
@@ -3191,10 +3191,17 @@ static int xmit_one(struct sk_buff *skb,
 {
 	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 ||
 	    (skb = dev->eth_mangle_tx(dev, skb)) != NULL)
@@ -4683,6 +4690,10 @@ void netdev_rx_handler_unregister(struct
 	RCU_INIT_POINTER(dev->rx_handler_data, NULL);
 }
 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
@@ -4733,7 +4744,9 @@ static int __netif_receive_skb_core(stru
 	bool deliver_exact = false;
 	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 +4785,15 @@ another_round:
 		if (unlikely(!skb))
 			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	2020-06-23 11:43:45.732009000 -0700
+++ b/net/Kconfig	2020-06-27 18:24:06.035538006 -0700
@@ -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
+ default y

--- a/net/netfilter/nf_conntrack_proto_tcp.c	2020-06-23 11:43:45.404018000 -0700
+++ b/net/netfilter/nf_conntrack_proto_tcp.c	2020-06-27 18:28:24.610214943 -0700
@@ -33,12 +33,16 @@
 
 /* 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;