Commit 5728ae0d authored by Petr Machata's avatar Petr Machata Committed by David S. Miller
Browse files

vxlan: Add hardware FDB learning 



In order to allow devices to signal learning events to VXLAN, introduce
two new switchdev messages: SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE and
SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE.

Listen to these notifications in the vxlan driver. The FDB entries
learned this way have an NTF_EXT_LEARNED flag, and only entries marked
as such can be unlearned by the _DEL_ event. They are also immediately
marked as offloaded. This is the same behavior that the bridge driver
observes.

Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0ec566aa

drivers/net/vxlan.c

+72 −1
Original line number Diff line number Diff line
@@ -3923,18 +3923,89 @@ out: 
	spin_unlock_bh(&vxlan->hash_lock);

}



static int

vxlan_fdb_external_learn_add(struct net_device *dev,

			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)

{

	struct vxlan_dev *vxlan = netdev_priv(dev);

	int err;



	spin_lock_bh(&vxlan->hash_lock);

	err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,

			       NUD_REACHABLE,

			       NLM_F_CREATE | NLM_F_REPLACE,

			       fdb_info->remote_port,

			       fdb_info->vni,

			       fdb_info->remote_vni,

			       fdb_info->remote_ifindex,

			       NTF_USE | NTF_SELF | NTF_EXT_LEARNED,

			       false);

	spin_unlock_bh(&vxlan->hash_lock);



	return err;

}



static int

vxlan_fdb_external_learn_del(struct net_device *dev,

			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)

{

	struct vxlan_dev *vxlan = netdev_priv(dev);

	struct vxlan_fdb *f;

	int err = 0;



	spin_lock_bh(&vxlan->hash_lock);



	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);

	if (!f)

		err = -ENOENT;

	else if (f->flags & NTF_EXT_LEARNED)

		err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,

					 fdb_info->remote_ip,

					 fdb_info->remote_port,

					 fdb_info->vni,

					 fdb_info->remote_vni,

					 fdb_info->remote_ifindex,

					 false);



	spin_unlock_bh(&vxlan->hash_lock);



	return err;

}



static int vxlan_switchdev_event(struct notifier_block *unused,

				 unsigned long event, void *ptr)

{

	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);

	struct switchdev_notifier_vxlan_fdb_info *fdb_info;

	int err = 0;



	switch (event) {

	case SWITCHDEV_VXLAN_FDB_OFFLOADED:

		vxlan_fdb_offloaded_set(dev, ptr);

		break;

	case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:

		fdb_info = ptr;

		err = vxlan_fdb_external_learn_add(dev, fdb_info);

		if (err) {

			err = notifier_from_errno(err);

			break;

		}

		fdb_info->offloaded = true;

		vxlan_fdb_offloaded_set(dev, fdb_info);

		break;

	case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:

		fdb_info = ptr;

		err = vxlan_fdb_external_learn_del(dev, fdb_info);

		if (err) {

			err = notifier_from_errno(err);

			break;

		}

		fdb_info->offloaded = false;

		vxlan_fdb_offloaded_set(dev, fdb_info);

		break;

	}



	return 0;

	return err;

}



static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {

include/net/switchdev.h

+2 −0
Original line number Diff line number Diff line
@@ -146,6 +146,8 @@ enum switchdev_notifier_type { 
	SWITCHDEV_FDB_DEL_TO_DEVICE,

	SWITCHDEV_FDB_OFFLOADED,



	SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE,

	SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE,

	SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,

	SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE,

	SWITCHDEV_VXLAN_FDB_OFFLOADED,

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