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Subject[PATCH 2/4] macvlan: allow in-kernel modules to create and manage macvlan devices
Date
The macvlan driver didn't allow for creation/deletion of devices
by other in-kernel modules. This patch provides common routines
for both in-kernel and netlink based management. This patch
also enables macvlan device support for gro for lower level
devices that support gro.

Signed-off-by: Patrick Mullaney <pmullaney@novell.com>
---
drivers/net/macvlan.c | 72 +++++++++++++++++++++++++++++++----------------
include/linux/macvlan.h | 6 ++++
2 files changed, 53 insertions(+), 25 deletions(-)
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 0a389b8..6b98b26 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -208,7 +208,7 @@ static const struct header_ops macvlan_hard_header_ops = {
.cache_update = eth_header_cache_update,
};

-static int macvlan_open(struct net_device *dev)
+int macvlan_open(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
@@ -235,7 +235,7 @@ out:
return err;
}

-static int macvlan_stop(struct net_device *dev)
+int macvlan_stop(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
@@ -316,7 +316,7 @@ static struct lock_class_key macvlan_netdev_addr_lock_key;
#define MACVLAN_FEATURES \
(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
- NETIF_F_TSO_ECN | NETIF_F_TSO6)
+ NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)

#define MACVLAN_STATE_MASK \
((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
@@ -440,7 +440,7 @@ static void macvlan_port_destroy(struct net_device *dev)
kfree(port);
}

-static void macvlan_transfer_operstate(struct net_device *dev)
+void macvlan_transfer_operstate(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
const struct net_device *lowerdev = vlan->lowerdev;
@@ -458,6 +458,7 @@ static void macvlan_transfer_operstate(struct net_device *dev)
netif_carrier_off(dev);
}
}
+EXPORT_SYMBOL_GPL(macvlan_transfer_operstate);

int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
@@ -471,11 +472,47 @@ int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
}
EXPORT_SYMBOL_GPL(macvlan_validate);

-int macvlan_newlink(struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[])
+int macvlan_link_lowerdev(struct net_device *dev,
+ struct net_device *lowerdev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port;
+ int err = 0;
+
+ if (lowerdev->macvlan_port == NULL) {
+ err = macvlan_port_create(lowerdev);
+ if (err < 0)
+ return err;
+ }
+ port = lowerdev->macvlan_port;
+
+ vlan->lowerdev = lowerdev;
+ vlan->dev = dev;
+ vlan->port = port;
+ vlan->receive = netif_rx;
+
+ macvlan_init(dev);
+
+ list_add_tail(&vlan->list, &port->vlans);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(macvlan_link_lowerdev);
+
+void macvlan_unlink_lowerdev(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct macvlan_port *port = vlan->port;
+
+ list_del(&vlan->list);
+
+ if (list_empty(&port->vlans))
+ macvlan_port_destroy(port->dev);
+}
+EXPORT_SYMBOL_GPL(macvlan_unlink_lowerdev);
+
+int macvlan_newlink(struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
struct net_device *lowerdev;
int err;

@@ -502,23 +539,14 @@ int macvlan_newlink(struct net_device *dev,
if (!tb[IFLA_ADDRESS])
random_ether_addr(dev->dev_addr);

- if (lowerdev->macvlan_port == NULL) {
- err = macvlan_port_create(lowerdev);
- if (err < 0)
- return err;
- }
- port = lowerdev->macvlan_port;
-
- vlan->lowerdev = lowerdev;
- vlan->dev = dev;
- vlan->port = port;
- vlan->receive = netif_rx;
+ err = macvlan_link_lowerdev(dev, lowerdev);
+ if (err < 0)
+ return err;

err = register_netdevice(dev);
if (err < 0)
return err;

- list_add_tail(&vlan->list, &port->vlans);
macvlan_transfer_operstate(dev);
return 0;
}
@@ -526,14 +554,8 @@ EXPORT_SYMBOL_GPL(macvlan_newlink);

void macvlan_dellink(struct net_device *dev)
{
- struct macvlan_dev *vlan = netdev_priv(dev);
- struct macvlan_port *port = vlan->port;
-
- list_del(&vlan->list);
+ macvlan_unlink_lowerdev(dev);
unregister_netdevice(dev);
-
- if (list_empty(&port->vlans))
- macvlan_port_destroy(port->dev);
}
EXPORT_SYMBOL_GPL(macvlan_dellink);

diff --git a/include/linux/macvlan.h b/include/linux/macvlan.h
index 3f3c6c3..cf8738a 100644
--- a/include/linux/macvlan.h
+++ b/include/linux/macvlan.h
@@ -24,6 +24,12 @@ struct macvlan_dev {
};

extern int macvlan_start_xmit(struct sk_buff *skb, struct net_device *dev);
+extern int macvlan_link_lowerdev(struct net_device *dev,
+ struct net_device *lowerdev);
+
+extern void macvlan_unlink_lowerdev(struct net_device *dev);
+
+extern void macvlan_transfer_operstate(struct net_device *dev);

extern void macvlan_setup(struct net_device *dev);



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