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vxlan: Add hardware FDB learning

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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: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2018-11-21 08:02:39 +00:00 committed by David S. Miller
parent 0ec566aacc
commit 5728ae0d17
2 changed files with 74 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

73
drivers/net/vxlan.c
View file

@ -3923,18 +3923,89 @@ vxlan_fdb_offloaded_set(struct net_device *dev,
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 = {

2
include/net/switchdev.h
View file

@ -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,