net: bridge: switch to net core statistics counters handling

Use netdev->tstats instead of a member of net_bridge for storing
a pointer to the per-cpu counters. This allows us to use core
functionality for statistics handling.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/9bad2be2-fd84-7c6e-912f-cee433787018@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_device.c

@@ -30,7 +30,6 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct net_bridge *br = netdev_priv(dev);
 	struct net_bridge_fdb_entry *dst;
 	struct net_bridge_mdb_entry *mdst;
-	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
 	const struct nf_br_ops *nf_ops;
 	u8 state = BR_STATE_FORWARDING;
 	const unsigned char *dest;
@@ -45,10 +44,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_OK;
 	}
 
-	u64_stats_update_begin(&brstats->syncp);
-	brstats->tx_packets++;
-	brstats->tx_bytes += skb->len;
-	u64_stats_update_end(&brstats->syncp);
+	dev_sw_netstats_tx_add(dev, 1, skb->len);
 
 	br_switchdev_frame_unmark(skb);
 	BR_INPUT_SKB_CB(skb)->brdev = dev;
@@ -119,26 +115,26 @@ static int br_dev_init(struct net_device *dev)
 	struct net_bridge *br = netdev_priv(dev);
 	int err;
 
-	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!br->stats)
+	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!dev->tstats)
 		return -ENOMEM;
 
 	err = br_fdb_hash_init(br);
 	if (err) {
-		free_percpu(br->stats);
+		free_percpu(dev->tstats);
 		return err;
 	}
 
 	err = br_mdb_hash_init(br);
 	if (err) {
-		free_percpu(br->stats);
+		free_percpu(dev->tstats);
 		br_fdb_hash_fini(br);
 		return err;
 	}
 
 	err = br_vlan_init(br);
 	if (err) {
-		free_percpu(br->stats);
+		free_percpu(dev->tstats);
 		br_mdb_hash_fini(br);
 		br_fdb_hash_fini(br);
 		return err;
@@ -146,7 +142,7 @@ static int br_dev_init(struct net_device *dev)
 
 	err = br_multicast_init_stats(br);
 	if (err) {
-		free_percpu(br->stats);
+		free_percpu(dev->tstats);
 		br_vlan_flush(br);
 		br_mdb_hash_fini(br);
 		br_fdb_hash_fini(br);
@@ -165,7 +161,7 @@ static void br_dev_uninit(struct net_device *dev)
 	br_vlan_flush(br);
 	br_mdb_hash_fini(br);
 	br_fdb_hash_fini(br);
-	free_percpu(br->stats);
+	free_percpu(dev->tstats);
 }
 
 static int br_dev_open(struct net_device *dev)
@@ -202,15 +198,6 @@ static int br_dev_stop(struct net_device *dev)
 	return 0;
 }
 
-static void br_get_stats64(struct net_device *dev,
-			   struct rtnl_link_stats64 *stats)
-{
-	struct net_bridge *br = netdev_priv(dev);
-
-	netdev_stats_to_stats64(stats, &dev->stats);
-	dev_fetch_sw_netstats(stats, br->stats);
-}
-
 static int br_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct net_bridge *br = netdev_priv(dev);
@@ -404,7 +391,7 @@ static const struct net_device_ops br_netdev_ops = {
 	.ndo_init		 = br_dev_init,
 	.ndo_uninit		 = br_dev_uninit,
 	.ndo_start_xmit		 = br_dev_xmit,
-	.ndo_get_stats64	 = br_get_stats64,
+	.ndo_get_stats64	 = dev_get_tstats64,
 	.ndo_set_mac_address	 = br_set_mac_address,
 	.ndo_set_rx_mode	 = br_dev_set_multicast_list,
 	.ndo_change_rx_flags	 = br_dev_change_rx_flags,

net/bridge/br_input.c

@@ -35,12 +35,8 @@ static int br_pass_frame_up(struct sk_buff *skb)
 	struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
 	struct net_bridge *br = netdev_priv(brdev);
 	struct net_bridge_vlan_group *vg;
-	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
 
-	u64_stats_update_begin(&brstats->syncp);
-	brstats->rx_packets++;
-	brstats->rx_bytes += skb->len;
-	u64_stats_update_end(&brstats->syncp);
+	dev_sw_netstats_rx_add(brdev, skb->len);
 
 	vg = br_vlan_group_rcu(br);
 	/* Bridge is just like any other port.  Make sure the

net/bridge/br_private.h

@@ -377,7 +377,6 @@ struct net_bridge {
 	spinlock_t			hash_lock;
 	struct hlist_head		frame_type_list;
 	struct net_device		*dev;
-	struct pcpu_sw_netstats		__percpu *stats;
 	unsigned long			options;
 	/* These fields are accessed on each packet */
 #ifdef CONFIG_BRIDGE_VLAN_FILTERING