From 5728ae0d17d27e14b7e5034f73a38b562cfcd5c5 Mon Sep 17 00:00:00 2001
From: Petr Machata <petrm@mellanox.com>
Date: Wed, 21 Nov 2018 08:02:39 +0000
Subject: [PATCH] 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: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/vxlan.c | 73 ++++++++++++++++++++++++++++++++++++++++-
include/net/switchdev.h | 2 ++
2 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index b50705a50686a..03ba1b56ba6d6 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -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 = {
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 881ecb1555bf1..7b371e7c4bc67 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -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,
--
2.30.2