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vxlan: support for nexthop notifiers

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vxlan driver registers for nexthop add/del notifiers to
cleanup fdb entries pointing to such nexthops.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2020-05-21 22:26:16 -07:00 committed by David S. Miller
parent 8590ceedb7
commit c7cdbe2efc
1 changed files with 29 additions and 4 deletions
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33
drivers/net/vxlan.c
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@ -81,6 +81,7 @@ struct vxlan_fdb {
u16 flags; /* see ndm_flags and below */ u16 flags; /* see ndm_flags and below */
struct list_head nh_list; struct list_head nh_list;
struct nexthop __rcu *nh; struct nexthop __rcu *nh;
struct vxlan_dev *vdev;
}; };
#define NTF_VXLAN_ADDED_BY_USER 0x100 #define NTF_VXLAN_ADDED_BY_USER 0x100
@ -813,8 +814,9 @@ static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
} }
static struct vxlan_fdb *vxlan_fdb_alloc(const u8 *mac, __u16 state, static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
__be32 src_vni, __u16 ndm_flags) __u16 state, __be32 src_vni,
__u16 ndm_flags)
{ {
struct vxlan_fdb *f; struct vxlan_fdb *f;
@ -826,6 +828,7 @@ static struct vxlan_fdb *vxlan_fdb_alloc(const u8 *mac, __u16 state,
f->updated = f->used = jiffies; f->updated = f->used = jiffies;
f->vni = src_vni; f->vni = src_vni;
f->nh = NULL; f->nh = NULL;
f->vdev = vxlan;
INIT_LIST_HEAD(&f->nh_list); INIT_LIST_HEAD(&f->nh_list);
INIT_LIST_HEAD(&f->remotes); INIT_LIST_HEAD(&f->remotes);
memcpy(f->eth_addr, mac, ETH_ALEN); memcpy(f->eth_addr, mac, ETH_ALEN);
@ -923,7 +926,7 @@ static int vxlan_fdb_create(struct vxlan_dev *vxlan,
return -ENOSPC; return -ENOSPC;
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
f = vxlan_fdb_alloc(mac, state, src_vni, ndm_flags); f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
if (!f) if (!f)
return -ENOMEM; return -ENOMEM;
@ -988,6 +991,7 @@ static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
} }
hlist_del_rcu(&f->hlist); hlist_del_rcu(&f->hlist);
f->vdev = NULL;
call_rcu(&f->rcu, vxlan_fdb_free); call_rcu(&f->rcu, vxlan_fdb_free);
} }
@ -4598,6 +4602,25 @@ static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
.notifier_call = vxlan_switchdev_event, .notifier_call = vxlan_switchdev_event,
}; };
static int vxlan_nexthop_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct nexthop *nh = ptr;
struct vxlan_fdb *fdb, *tmp;
if (!nh || event != NEXTHOP_EVENT_DEL)
return NOTIFY_DONE;
list_for_each_entry_safe(fdb, tmp, &nh->fdb_list, nh_list)
vxlan_fdb_destroy(fdb->vdev, fdb, false, false);
return NOTIFY_DONE;
}
static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
.notifier_call = vxlan_nexthop_event,
};
static __net_init int vxlan_init_net(struct net *net) static __net_init int vxlan_init_net(struct net *net)
{ {
struct vxlan_net *vn = net_generic(net, vxlan_net_id); struct vxlan_net *vn = net_generic(net, vxlan_net_id);
@ -4609,7 +4632,7 @@ static __net_init int vxlan_init_net(struct net *net)
for (h = 0; h < PORT_HASH_SIZE; ++h) for (h = 0; h < PORT_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vn->sock_list[h]); INIT_HLIST_HEAD(&vn->sock_list[h]);
return 0; return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
} }
static void vxlan_destroy_tunnels(struct net *net, struct list_head *head) static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
@ -4641,6 +4664,8 @@ static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
LIST_HEAD(list); LIST_HEAD(list);
rtnl_lock(); rtnl_lock();
list_for_each_entry(net, net_list, exit_list)
unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
list_for_each_entry(net, net_list, exit_list) list_for_each_entry(net, net_list, exit_list)
vxlan_destroy_tunnels(net, &list); vxlan_destroy_tunnels(net, &list);