From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 15 Mar 2018 20:50:37 +0100
Subject: [PATCH] net: bridge: support hardware flow table offload

Look up the real device and pass it on

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -18,6 +18,10 @@
 #include <linux/ethtool.h>
 #include <linux/list.h>
 #include <linux/netfilter_bridge.h>
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_flow_table.h>
+#endif
 
 #include <linux/uaccess.h>
 #include "br_private.h"
@@ -340,6 +344,28 @@ static const struct ethtool_ops br_ethto
 	.get_link	= ethtool_op_get_link,
 };
 
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+static int br_flow_offload_check(struct flow_offload_hw_path *path)
+{
+	struct net_device *dev = path->dev;
+	struct net_bridge *br = netdev_priv(dev);
+	struct net_bridge_fdb_entry *dst;
+
+	if (!(path->flags & FLOW_OFFLOAD_PATH_ETHERNET))
+		return -EINVAL;
+
+	dst = br_fdb_find_rcu(br, path->eth_dest, path->vlan_id);
+	if (!dst || !dst->dst)
+		return -ENOENT;
+
+	path->dev = dst->dst->dev;
+	if (path->dev->netdev_ops->ndo_flow_offload_check)
+		return path->dev->netdev_ops->ndo_flow_offload_check(path);
+
+	return 0;
+}
+#endif /* CONFIG_NF_FLOW_TABLE */
+
 static const struct net_device_ops br_netdev_ops = {
 	.ndo_open		 = br_dev_open,
 	.ndo_stop		 = br_dev_stop,
@@ -367,6 +393,9 @@ static const struct net_device_ops br_ne
 	.ndo_bridge_setlink	 = br_setlink,
 	.ndo_bridge_dellink	 = br_dellink,
 	.ndo_features_check	 = passthru_features_check,
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+	.ndo_flow_offload_check	 = br_flow_offload_check,
+#endif
 };
 
 static struct device_type br_type = {
