1 files changed, 218 insertions, 44 deletions

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index d53e299..958df38 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -30,8 +30,10 @@
 #include <linux/if_link.h>
 #include <linux/if_macvlan.h>
 #include <linux/hash.h>
+#include <linux/workqueue.h>
 #include <net/rtnetlink.h>
 #include <net/xfrm.h>
+#include <linux/netpoll.h>
 
 #define MACVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)
 
@@ -40,10 +42,19 @@ struct macvlan_port {
 	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
 	struct list_head	vlans;
 	struct rcu_head		rcu;
+	struct sk_buff_head	bc_queue;
+	struct work_struct	bc_work;
 	bool 			passthru;
-	int			count;
 };
 
+#define MACVLAN_PORT_IS_EMPTY(port)    list_empty(&port->vlans)
+
+struct macvlan_skb_cb {
+	const struct macvlan_dev *src;
+};
+
+#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
+
 static void macvlan_port_destroy(struct net_device *dev);
 
 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
@@ -120,7 +131,7 @@ static int macvlan_broadcast_one(struct sk_buff *skb,
 	struct net_device *dev = vlan->dev;
 
 	if (local)
-		return dev_forward_skb(dev, skb);
+		return __dev_forward_skb(dev, skb);
 
 	skb->dev = dev;
 	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
@@ -128,7 +139,7 @@ static int macvlan_broadcast_one(struct sk_buff *skb,
 	else
 		skb->pkt_type = PACKET_MULTICAST;
 
-	return netif_rx(skb);
+	return 0;
 }
 
 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
@@ -175,32 +186,32 @@ static void macvlan_broadcast(struct sk_buff *skb,
 			if (likely(nskb))
 				err = macvlan_broadcast_one(
 					nskb, vlan, eth,
-					mode == MACVLAN_MODE_BRIDGE);
+					mode == MACVLAN_MODE_BRIDGE) ?:
+				      netif_rx_ni(nskb);
 			macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 					 err == NET_RX_SUCCESS, 1);
 		}
 	}
 }
 
-/* called under rcu_read_lock() from netif_receive_skb */
-static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
+static void macvlan_process_broadcast(struct work_struct *w)
 {
-	struct macvlan_port *port;
-	struct sk_buff *skb = *pskb;
-	const struct ethhdr *eth = eth_hdr(skb);
-	const struct macvlan_dev *vlan;
-	const struct macvlan_dev *src;
-	struct net_device *dev;
-	unsigned int len = 0;
-	int ret = NET_RX_DROP;
+	struct macvlan_port *port = container_of(w, struct macvlan_port,
+						 bc_work);
+	struct sk_buff *skb;
+	struct sk_buff_head list;
+
+	skb_queue_head_init(&list);
+
+	spin_lock_bh(&port->bc_queue.lock);
+	skb_queue_splice_tail_init(&port->bc_queue, &list);
+	spin_unlock_bh(&port->bc_queue.lock);
+
+	while ((skb = __skb_dequeue(&list))) {
+		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+		rcu_read_lock();
 
-	port = macvlan_port_get_rcu(skb->dev);
-	if (is_multicast_ether_addr(eth->h_dest)) {
-		skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
-		if (!skb)
-			return RX_HANDLER_CONSUMED;
-		eth = eth_hdr(skb);
-		src = macvlan_hash_lookup(port, eth->h_source);
 		if (!src)
 			/* frame comes from an external address */
 			macvlan_broadcast(skb, port, NULL,
@@ -213,20 +224,80 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 			macvlan_broadcast(skb, port, src->dev,
 					  MACVLAN_MODE_VEPA |
 					  MACVLAN_MODE_BRIDGE);
-		else if (src->mode == MACVLAN_MODE_BRIDGE)
+		else
 			/*
 			 * flood only to VEPA ports, bridge ports
 			 * already saw the frame on the way out.
 			 */
 			macvlan_broadcast(skb, port, src->dev,
 					  MACVLAN_MODE_VEPA);
-		else {
+
+		rcu_read_unlock();
+
+		kfree_skb(skb);
+	}
+}
+
+static void macvlan_broadcast_enqueue(struct macvlan_port *port,
+				      struct sk_buff *skb)
+{
+	struct sk_buff *nskb;
+	int err = -ENOMEM;
+
+	nskb = skb_clone(skb, GFP_ATOMIC);
+	if (!nskb)
+		goto err;
+
+	spin_lock(&port->bc_queue.lock);
+	if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
+		__skb_queue_tail(&port->bc_queue, nskb);
+		err = 0;
+	}
+	spin_unlock(&port->bc_queue.lock);
+
+	if (err)
+		goto free_nskb;
+
+	schedule_work(&port->bc_work);
+	return;
+
+free_nskb:
+	kfree_skb(nskb);
+err:
+	atomic_long_inc(&skb->dev->rx_dropped);
+}
+
+/* called under rcu_read_lock() from netif_receive_skb */
+static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
+{
+	struct macvlan_port *port;
+	struct sk_buff *skb = *pskb;
+	const struct ethhdr *eth = eth_hdr(skb);
+	const struct macvlan_dev *vlan;
+	const struct macvlan_dev *src;
+	struct net_device *dev;
+	unsigned int len = 0;
+	int ret = NET_RX_DROP;
+
+	port = macvlan_port_get_rcu(skb->dev);
+	if (is_multicast_ether_addr(eth->h_dest)) {
+		skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
+		if (!skb)
+			return RX_HANDLER_CONSUMED;
+		eth = eth_hdr(skb);
+		src = macvlan_hash_lookup(port, eth->h_source);
+		if (src && src->mode != MACVLAN_MODE_VEPA &&
+		    src->mode != MACVLAN_MODE_BRIDGE) {
 			/* forward to original port. */
 			vlan = src;
-			ret = macvlan_broadcast_one(skb, vlan, eth, 0);
+			ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
+			      netif_rx(skb);
 			goto out;
 		}
 
+		MACVLAN_SKB_CB(skb)->src = src;
+		macvlan_broadcast_enqueue(port, skb);
+
 		return RX_HANDLER_PASS;
 	}
 
@@ -287,12 +358,26 @@ xmit_world:
 	return dev_queue_xmit(skb);
 }
 
+static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	if (vlan->netpoll)
+		netpoll_send_skb(vlan->netpoll, skb);
+#else
+	BUG();
+#endif
+	return NETDEV_TX_OK;
+}
+
 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 				      struct net_device *dev)
 {
 	unsigned int len = skb->len;
 	int ret;
-	const struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	if (unlikely(netpoll_tx_running(dev)))
+		return macvlan_netpoll_send_skb(vlan, skb);
 
 	if (vlan->fwd_priv) {
 		skb->dev = vlan->lowerdev;
@@ -424,35 +509,49 @@ hash_del:
 	return 0;
 }
 
-static int macvlan_set_mac_address(struct net_device *dev, void *p)
+static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 {
 	struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;
-	struct sockaddr *addr = p;
 	int err;
 
-	if (!is_valid_ether_addr(addr->sa_data))
-		return -EADDRNOTAVAIL;
-
 	if (!(dev->flags & IFF_UP)) {
 		/* Just copy in the new address */
-		memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+		ether_addr_copy(dev->dev_addr, addr);
 	} else {
 		/* Rehash and update the device filters */
-		if (macvlan_addr_busy(vlan->port, addr->sa_data))
+		if (macvlan_addr_busy(vlan->port, addr))
 			return -EBUSY;
 
-		err = dev_uc_add(lowerdev, addr->sa_data);
-		if (err)
-			return err;
+		if (!vlan->port->passthru) {
+			err = dev_uc_add(lowerdev, addr);
+			if (err)
+				return err;
 
-		dev_uc_del(lowerdev, dev->dev_addr);
+			dev_uc_del(lowerdev, dev->dev_addr);
+		}
 
-		macvlan_hash_change_addr(vlan, addr->sa_data);
+		macvlan_hash_change_addr(vlan, addr);
 	}
 	return 0;
 }
 
+static int macvlan_set_mac_address(struct net_device *dev, void *p)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		dev_set_mac_address(vlan->lowerdev, addr);
+		return 0;
+	}
+
+	return macvlan_sync_address(dev, addr->sa_data);
+}
+
 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 {
 	struct macvlan_dev *vlan = netdev_priv(dev);
@@ -567,8 +666,7 @@ static void macvlan_uninit(struct net_device *dev)
 
 	free_percpu(vlan->pcpu_stats);
 
-	port->count -= 1;
-	if (!port->count)
+	if (MACVLAN_PORT_IS_EMPTY(port))
 		macvlan_port_destroy(port->dev);
 }
 
@@ -705,6 +803,50 @@ static netdev_features_t macvlan_fix_features(struct net_device *dev,
 	return features;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void macvlan_dev_poll_controller(struct net_device *dev)
+{
+	return;
+}
+
+static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *real_dev = vlan->lowerdev;
+	struct netpoll *netpoll;
+	int err = 0;
+
+	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
+	err = -ENOMEM;
+	if (!netpoll)
+		goto out;
+
+	err = __netpoll_setup(netpoll, real_dev);
+	if (err) {
+		kfree(netpoll);
+		goto out;
+	}
+
+	vlan->netpoll = netpoll;
+
+out:
+	return err;
+}
+
+static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct netpoll *netpoll = vlan->netpoll;
+
+	if (!netpoll)
+		return;
+
+	vlan->netpoll = NULL;
+
+	__netpoll_free_async(netpoll);
+}
+#endif	/* CONFIG_NET_POLL_CONTROLLER */
+
 static const struct ethtool_ops macvlan_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 	.get_settings		= macvlan_ethtool_get_settings,
@@ -730,6 +872,11 @@ static const struct net_device_ops macvlan_netdev_ops = {
 	.ndo_fdb_del		= macvlan_fdb_del,
 	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
 	.ndo_get_lock_subclass  = macvlan_get_nest_level,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= macvlan_dev_poll_controller,
+	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
+	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
+#endif
 };
 
 void macvlan_common_setup(struct net_device *dev)
@@ -770,6 +917,9 @@ static int macvlan_port_create(struct net_device *dev)
 	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 		INIT_HLIST_HEAD(&port->vlan_hash[i]);
 
+	skb_queue_head_init(&port->bc_queue);
+	INIT_WORK(&port->bc_work, macvlan_process_broadcast);
+
 	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 	if (err)
 		kfree(port);
@@ -782,6 +932,7 @@ static void macvlan_port_destroy(struct net_device *dev)
 {
 	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 
+	cancel_work_sync(&port->bc_work);
 	dev->priv_flags &= ~IFF_MACVLAN_PORT;
 	netdev_rx_handler_unregister(dev);
 	kfree_rcu(port, rcu);
@@ -868,13 +1019,12 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 
 	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
-		if (port->count)
+		if (!MACVLAN_PORT_IS_EMPTY(port))
 			return -EINVAL;
 		port->passthru = true;
 		eth_hw_addr_inherit(dev, lowerdev);
 	}
 
-	port->count += 1;
 	err = register_netdevice(dev);
 	if (err < 0)
 		goto destroy_port;
@@ -892,8 +1042,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 unregister_netdev:
 	unregister_netdevice(dev);
 destroy_port:
-	port->count -= 1;
-	if (!port->count)
+	if (MACVLAN_PORT_IS_EMPTY(port))
 		macvlan_port_destroy(lowerdev);
 
 	return err;
@@ -1028,6 +1177,25 @@ static int macvlan_device_event(struct notifier_block *unused,
 			netdev_update_features(vlan->dev);
 		}
 		break;
+	case NETDEV_CHANGEMTU:
+		list_for_each_entry(vlan, &port->vlans, list) {
+			if (vlan->dev->mtu <= dev->mtu)
+				continue;
+			dev_set_mtu(vlan->dev, dev->mtu);
+		}
+		break;
+	case NETDEV_CHANGEADDR:
+		if (!port->passthru)
+			return NOTIFY_DONE;
+
+		vlan = list_first_entry_or_null(&port->vlans,
+						struct macvlan_dev,
+						list);
+
+		if (macvlan_sync_address(vlan->dev, dev->dev_addr))
+			return NOTIFY_BAD;
+
+		break;
 	case NETDEV_UNREGISTER:
 		/* twiddle thumbs on netns device moves */
 		if (dev->reg_state != NETREG_UNREGISTERING)
@@ -1036,11 +1204,17 @@ static int macvlan_device_event(struct notifier_block *unused,
 		list_for_each_entry_safe(vlan, next, &port->vlans, list)
 			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
 		unregister_netdevice_many(&list_kill);
-		list_del(&list_kill);
 		break;
 	case NETDEV_PRE_TYPE_CHANGE:
 		/* Forbid underlaying device to change its type. */
 		return NOTIFY_BAD;
+
+	case NETDEV_NOTIFY_PEERS:
+	case NETDEV_BONDING_FAILOVER:
+	case NETDEV_RESEND_IGMP:
+		/* Propagate to all vlans */
+		list_for_each_entry(vlan, &port->vlans, list)
+			call_netdevice_notifiers(event, vlan->dev);
 	}
 	return NOTIFY_DONE;
 }