macvlan: allow multiple driver backends
This makes it possible to hook into the macvlan driver
from another kernel module. In particular, the goal is
to extend it with the macvtap backend that provides
a tun/tap compatible interface directly on the macvlan
device.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index d32e0bd..40faa36 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -39,31 +39,6 @@
struct list_head vlans;
};
-/**
- * struct macvlan_rx_stats - MACVLAN percpu rx stats
- * @rx_packets: number of received packets
- * @rx_bytes: number of received bytes
- * @multicast: number of received multicast packets
- * @rx_errors: number of errors
- */
-struct macvlan_rx_stats {
- unsigned long rx_packets;
- unsigned long rx_bytes;
- unsigned long multicast;
- unsigned long rx_errors;
-};
-
-struct macvlan_dev {
- struct net_device *dev;
- struct list_head list;
- struct hlist_node hlist;
- struct macvlan_port *port;
- struct net_device *lowerdev;
- struct macvlan_rx_stats *rx_stats;
- enum macvlan_mode mode;
-};
-
-
static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
const unsigned char *addr)
{
@@ -118,31 +93,17 @@
return 0;
}
-static inline void macvlan_count_rx(const struct macvlan_dev *vlan,
- unsigned int len, bool success,
- bool multicast)
-{
- struct macvlan_rx_stats *rx_stats;
- rx_stats = per_cpu_ptr(vlan->rx_stats, smp_processor_id());
- if (likely(success)) {
- rx_stats->rx_packets++;;
- rx_stats->rx_bytes += len;
- if (multicast)
- rx_stats->multicast++;
- } else {
- rx_stats->rx_errors++;
- }
-}
-
-static int macvlan_broadcast_one(struct sk_buff *skb, struct net_device *dev,
+static int macvlan_broadcast_one(struct sk_buff *skb,
+ const struct macvlan_dev *vlan,
const struct ethhdr *eth, bool local)
{
+ struct net_device *dev = vlan->dev;
if (!skb)
return NET_RX_DROP;
if (local)
- return dev_forward_skb(dev, skb);
+ return vlan->forward(dev, skb);
skb->dev = dev;
if (!compare_ether_addr_64bits(eth->h_dest,
@@ -151,7 +112,7 @@
else
skb->pkt_type = PACKET_MULTICAST;
- return netif_rx(skb);
+ return vlan->receive(skb);
}
static void macvlan_broadcast(struct sk_buff *skb,
@@ -175,7 +136,7 @@
continue;
nskb = skb_clone(skb, GFP_ATOMIC);
- err = macvlan_broadcast_one(nskb, vlan->dev, eth,
+ err = macvlan_broadcast_one(nskb, vlan, eth,
mode == MACVLAN_MODE_BRIDGE);
macvlan_count_rx(vlan, skb->len + ETH_HLEN,
err == NET_RX_SUCCESS, 1);
@@ -238,7 +199,7 @@
skb->dev = dev;
skb->pkt_type = PACKET_HOST;
- netif_rx(skb);
+ vlan->receive(skb);
return NULL;
}
@@ -260,7 +221,7 @@
dest = macvlan_hash_lookup(port, eth->h_dest);
if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
unsigned int length = skb->len + ETH_HLEN;
- int ret = dev_forward_skb(dest->dev, skb);
+ int ret = dest->forward(dest->dev, skb);
macvlan_count_rx(dest, length,
ret == NET_RX_SUCCESS, 0);
@@ -273,8 +234,8 @@
return dev_queue_xmit(skb);
}
-static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
- struct net_device *dev)
+netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
{
int i = skb_get_queue_mapping(skb);
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
@@ -290,6 +251,7 @@
return ret;
}
+EXPORT_SYMBOL_GPL(macvlan_start_xmit);
static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, const void *daddr,
@@ -623,8 +585,11 @@
return 0;
}
-static int macvlan_newlink(struct net *src_net, struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[])
+int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ int (*receive)(struct sk_buff *skb),
+ int (*forward)(struct net_device *dev,
+ struct sk_buff *skb))
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port;
@@ -664,6 +629,8 @@
vlan->lowerdev = lowerdev;
vlan->dev = dev;
vlan->port = port;
+ vlan->receive = receive;
+ vlan->forward = forward;
vlan->mode = MACVLAN_MODE_VEPA;
if (data && data[IFLA_MACVLAN_MODE])
@@ -677,8 +644,17 @@
netif_stacked_transfer_operstate(lowerdev, dev);
return 0;
}
+EXPORT_SYMBOL_GPL(macvlan_common_newlink);
-static void macvlan_dellink(struct net_device *dev, struct list_head *head)
+static int macvlan_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
+ return macvlan_common_newlink(src_net, dev, tb, data,
+ netif_rx,
+ dev_forward_skb);
+}
+
+void macvlan_dellink(struct net_device *dev, struct list_head *head)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port = vlan->port;
@@ -689,6 +665,7 @@
if (list_empty(&port->vlans))
macvlan_port_destroy(port->dev);
}
+EXPORT_SYMBOL_GPL(macvlan_dellink);
static int macvlan_changelink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
@@ -720,19 +697,27 @@
[IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
};
-static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
+int macvlan_link_register(struct rtnl_link_ops *ops)
+{
+ /* common fields */
+ ops->priv_size = sizeof(struct macvlan_dev);
+ ops->get_tx_queues = macvlan_get_tx_queues;
+ ops->setup = macvlan_setup;
+ ops->validate = macvlan_validate;
+ ops->maxtype = IFLA_MACVLAN_MAX;
+ ops->policy = macvlan_policy;
+ ops->changelink = macvlan_changelink;
+ ops->get_size = macvlan_get_size;
+ ops->fill_info = macvlan_fill_info;
+
+ return rtnl_link_register(ops);
+};
+EXPORT_SYMBOL_GPL(macvlan_link_register);
+
+static struct rtnl_link_ops macvlan_link_ops = {
.kind = "macvlan",
- .priv_size = sizeof(struct macvlan_dev),
- .get_tx_queues = macvlan_get_tx_queues,
- .setup = macvlan_setup,
- .validate = macvlan_validate,
.newlink = macvlan_newlink,
.dellink = macvlan_dellink,
- .maxtype = IFLA_MACVLAN_MAX,
- .policy = macvlan_policy,
- .changelink = macvlan_changelink,
- .get_size = macvlan_get_size,
- .fill_info = macvlan_fill_info,
};
static int macvlan_device_event(struct notifier_block *unused,
@@ -761,7 +746,7 @@
break;
case NETDEV_UNREGISTER:
list_for_each_entry_safe(vlan, next, &port->vlans, list)
- macvlan_dellink(vlan->dev, NULL);
+ vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
break;
}
return NOTIFY_DONE;
@@ -778,7 +763,7 @@
register_netdevice_notifier(&macvlan_notifier_block);
macvlan_handle_frame_hook = macvlan_handle_frame;
- err = rtnl_link_register(&macvlan_link_ops);
+ err = macvlan_link_register(&macvlan_link_ops);
if (err < 0)
goto err1;
return 0;