openvswitch: Remove vport stats.

Since all vport types are now backed by netdev, we can directly
use netdev stats. Following patch removes redundant stat
from vport.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Pravin B Shelar

net/openvswitch/vport-internal_dev.c

@@ -43,35 +43,26 @@ static struct internal_dev *internal_dev_priv(struct net_device *netdev)
 	return netdev_priv(netdev);
 }
 
-/* This function is only called by the kernel network layer.*/
-static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
-							struct rtnl_link_stats64 *stats)
-{
-	struct vport *vport = ovs_internal_dev_get_vport(netdev);
-	struct ovs_vport_stats vport_stats;
-
-	ovs_vport_get_stats(vport, &vport_stats);
-
-	/* The tx and rx stats need to be swapped because the
-	 * switch and host OS have opposite perspectives. */
-	stats->rx_packets	= vport_stats.tx_packets;
-	stats->tx_packets	= vport_stats.rx_packets;
-	stats->rx_bytes		= vport_stats.tx_bytes;
-	stats->tx_bytes		= vport_stats.rx_bytes;
-	stats->rx_errors	= vport_stats.tx_errors;
-	stats->tx_errors	= vport_stats.rx_errors;
-	stats->rx_dropped	= vport_stats.tx_dropped;
-	stats->tx_dropped	= vport_stats.rx_dropped;
-
-	return stats;
-}
-
 /* Called with rcu_read_lock_bh. */
 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
+	int len, err;
+
+	len = skb->len;
 	rcu_read_lock();
-	ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
+	err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
 	rcu_read_unlock();
+
+	if (likely(!err)) {
+		struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
+
+		u64_stats_update_begin(&tstats->syncp);
+		tstats->tx_bytes += len;
+		tstats->tx_packets++;
+		u64_stats_update_end(&tstats->syncp);
+	} else {
+		netdev->stats.tx_errors++;
+	}
 	return 0;
 }
 
@@ -121,7 +112,6 @@ static const struct net_device_ops internal_dev_netdev_ops = {
 	.ndo_start_xmit = internal_dev_xmit,
 	.ndo_set_mac_address = eth_mac_addr,
 	.ndo_change_mtu = internal_dev_change_mtu,
-	.ndo_get_stats64 = internal_dev_get_stats,
 };
 
 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
@@ -212,18 +202,17 @@ static void internal_dev_destroy(struct vport *vport)
 	rtnl_unlock();
 }
 
-static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
+static void internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 {
 	struct net_device *netdev = vport->dev;
-	int len;
+	struct pcpu_sw_netstats *stats;
 
 	if (unlikely(!(netdev->flags & IFF_UP))) {
 		kfree_skb(skb);
-		return 0;
+		netdev->stats.rx_dropped++;
+		return;
 	}
 
-	len = skb->len;
-
 	skb_dst_drop(skb);
 	nf_reset(skb);
 	secpath_reset(skb);
@@ -233,9 +222,13 @@ static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 	skb->protocol = eth_type_trans(skb, netdev);
 	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 
-	netif_rx(skb);
+	stats = this_cpu_ptr(netdev->tstats);
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+	u64_stats_update_end(&stats->syncp);
 
-	return len;
+	netif_rx(skb);
 }
 
 static struct vport_ops ovs_internal_vport_ops = {

net/openvswitch/vport-netdev.c

@@ -39,8 +39,11 @@
 static struct vport_ops ovs_netdev_vport_ops;
 
 /* Must be called with rcu_read_lock. */
-static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
+static void netdev_port_receive(struct sk_buff *skb)
 {
+	struct vport *vport;
+
+	vport = ovs_netdev_get_vport(skb->dev);
 	if (unlikely(!vport))
 		goto error;
 
@@ -56,10 +59,8 @@ static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
 
 	skb_push(skb, ETH_HLEN);
 	ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
-
 	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
 	return;
-
 error:
 	kfree_skb(skb);
 }
@@ -68,15 +69,11 @@ static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
 {
 	struct sk_buff *skb = *pskb;
-	struct vport *vport;
 
 	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 		return RX_HANDLER_PASS;
 
-	vport = ovs_netdev_get_vport(skb->dev);
-
-	netdev_port_receive(vport, skb);
-
+	netdev_port_receive(skb);
 	return RX_HANDLER_CONSUMED;
 }
 
@@ -203,27 +200,24 @@ static unsigned int packet_length(const struct sk_buff *skb)
 	return length;
 }
 
-int ovs_netdev_send(struct vport *vport, struct sk_buff *skb)
+void ovs_netdev_send(struct vport *vport, struct sk_buff *skb)
 {
 	int mtu = vport->dev->mtu;
-	int len;
 
 	if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
 		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
 				     vport->dev->name,
 				     packet_length(skb), mtu);
+		vport->dev->stats.tx_errors++;
 		goto drop;
 	}
 
 	skb->dev = vport->dev;
-	len = skb->len;
 	dev_queue_xmit(skb);
-
-	return len;
+	return;
 
 drop:
 	kfree_skb(skb);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(ovs_netdev_send);
 

net/openvswitch/vport-netdev.h

@@ -27,7 +27,7 @@
 struct vport *ovs_netdev_get_vport(struct net_device *dev);
 
 struct vport *ovs_netdev_link(struct vport *vport, const char *name);
-int ovs_netdev_send(struct vport *vport, struct sk_buff *skb);
+void ovs_netdev_send(struct vport *vport, struct sk_buff *skb);
 void ovs_netdev_detach_dev(struct vport *);
 
 int __init ovs_netdev_init(void);

net/openvswitch/vport.c

@@ -34,9 +34,6 @@
 #include "vport.h"
 #include "vport-internal_dev.h"
 
-static void ovs_vport_record_error(struct vport *,
-				   enum vport_err_type err_type);
-
 static LIST_HEAD(vport_ops_list);
 
 /* Protected by RCU read lock for reading, ovs_mutex for writing. */
@@ -157,12 +154,6 @@ struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
 		return ERR_PTR(-EINVAL);
 	}
 
-	vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!vport->percpu_stats) {
-		kfree(vport);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	return vport;
 }
 EXPORT_SYMBOL_GPL(ovs_vport_alloc);
@@ -183,7 +174,6 @@ void ovs_vport_free(struct vport *vport)
 	 * it is safe to use raw dereference.
 	 */
 	kfree(rcu_dereference_raw(vport->upcall_portids));
-	free_percpu(vport->percpu_stats);
 	kfree(vport);
 }
 EXPORT_SYMBOL_GPL(ovs_vport_free);
@@ -290,30 +280,24 @@ void ovs_vport_del(struct vport *vport)
  */
 void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
 {
+	struct net_device *dev = vport->dev;
 	int i;
 
 	memset(stats, 0, sizeof(*stats));
+	stats->rx_errors  = dev->stats.rx_errors;
+	stats->tx_errors  = dev->stats.tx_errors;
+	stats->tx_dropped = dev->stats.tx_dropped;
+	stats->rx_dropped = dev->stats.rx_dropped;
 
-	/* We potentially have 2 sources of stats that need to be combined:
-	 * those we have collected (split into err_stats and percpu_stats) from
-	 * set_stats() and device error stats from netdev->get_stats() (for
-	 * errors that happen  downstream and therefore aren't reported through
-	 * our vport_record_error() function).
-	 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
-	 * netdev-stats can be directly read over netlink-ioctl.
-	 */
-
-	stats->rx_errors  = atomic_long_read(&vport->err_stats.rx_errors);
-	stats->tx_errors  = atomic_long_read(&vport->err_stats.tx_errors);
-	stats->tx_dropped = atomic_long_read(&vport->err_stats.tx_dropped);
-	stats->rx_dropped = atomic_long_read(&vport->err_stats.rx_dropped);
+	stats->rx_dropped += atomic_long_read(&dev->rx_dropped);
+	stats->tx_dropped += atomic_long_read(&dev->tx_dropped);
 
 	for_each_possible_cpu(i) {
 		const struct pcpu_sw_netstats *percpu_stats;
 		struct pcpu_sw_netstats local_stats;
 		unsigned int start;
 
-		percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
+		percpu_stats = per_cpu_ptr(dev->tstats, i);
 
 		do {
 			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
@@ -468,94 +452,25 @@ u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
  * Must be called with rcu_read_lock.  The packet cannot be shared and
  * skb->data should point to the Ethernet header.
  */
-void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
-		       const struct ip_tunnel_info *tun_info)
+int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
+		      const struct ip_tunnel_info *tun_info)
 {
-	struct pcpu_sw_netstats *stats;
 	struct sw_flow_key key;
 	int error;
 
-	stats = this_cpu_ptr(vport->percpu_stats);
-	u64_stats_update_begin(&stats->syncp);
-	stats->rx_packets++;
-	stats->rx_bytes += skb->len +
-			   (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
-	u64_stats_update_end(&stats->syncp);
-
 	OVS_CB(skb)->input_vport = vport;
 	OVS_CB(skb)->mru = 0;
 	/* Extract flow from 'skb' into 'key'. */
 	error = ovs_flow_key_extract(tun_info, skb, &key);
 	if (unlikely(error)) {
 		kfree_skb(skb);
-		return;
+		return error;
 	}
 	ovs_dp_process_packet(skb, &key);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(ovs_vport_receive);
 
-/**
- *	ovs_vport_send - send a packet on a device
- *
- * @vport: vport on which to send the packet
- * @skb: skb to send
- *
- * Sends the given packet and returns the length of data sent.  Either ovs
- * lock or rcu_read_lock must be held.
- */
-int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
-{
-	int sent = vport->ops->send(vport, skb);
-
-	if (likely(sent > 0)) {
-		struct pcpu_sw_netstats *stats;
-
-		stats = this_cpu_ptr(vport->percpu_stats);
-
-		u64_stats_update_begin(&stats->syncp);
-		stats->tx_packets++;
-		stats->tx_bytes += sent;
-		u64_stats_update_end(&stats->syncp);
-	} else if (sent < 0) {
-		ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
-	} else {
-		ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
-	}
-	return sent;
-}
-
-/**
- *	ovs_vport_record_error - indicate device error to generic stats layer
- *
- * @vport: vport that encountered the error
- * @err_type: one of enum vport_err_type types to indicate the error type
- *
- * If using the vport generic stats layer indicate that an error of the given
- * type has occurred.
- */
-static void ovs_vport_record_error(struct vport *vport,
-				   enum vport_err_type err_type)
-{
-	switch (err_type) {
-	case VPORT_E_RX_DROPPED:
-		atomic_long_inc(&vport->err_stats.rx_dropped);
-		break;
-
-	case VPORT_E_RX_ERROR:
-		atomic_long_inc(&vport->err_stats.rx_errors);
-		break;
-
-	case VPORT_E_TX_DROPPED:
-		atomic_long_inc(&vport->err_stats.tx_dropped);
-		break;
-
-	case VPORT_E_TX_ERROR:
-		atomic_long_inc(&vport->err_stats.tx_errors);
-		break;
-	}
-
-}
-
 static void free_vport_rcu(struct rcu_head *rcu)
 {
 	struct vport *vport = container_of(rcu, struct vport, rcu);