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vxlan: Add switchdev notifications

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When offloading VXLAN devices, drivers need to know about events in
VXLAN FDB database. Since VXLAN models a bridge, it is natural to
distribute the VXLAN FDB notifications using the pre-existing switchdev
notification mechanism.

To that end, introduce two new notification types:
SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE and SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE.
Introduce a new function, vxlan_fdb_switchdev_call_notifiers() to send
the new notifier types, and a struct switchdev_notifier_vxlan_fdb_info
to communicate the details of the FDB entry under consideration.

Invoke the new function from vxlan_fdb_notify().

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 2018-10-17 08:53:22 +00:00 • committed by David S. Miller
parent 5ff4ff4fe8
commit 9a99735317
3 changed files with 58 additions and 2 deletions
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44
drivers/net/vxlan.c
View file

@ -327,7 +327,7 @@ static inline size_t vxlan_nlmsg_size(void)
+ nla_total_size(sizeof(struct nda_cacheinfo)); + nla_total_size(sizeof(struct nda_cacheinfo));
} }
static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type) struct vxlan_rdst *rd, int type)
{ {
struct net *net = dev_net(vxlan->dev); struct net *net = dev_net(vxlan->dev);
@ -353,6 +353,48 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
} }
static void vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
struct vxlan_fdb *fdb,
struct vxlan_rdst *rd,
bool adding)
{
struct switchdev_notifier_vxlan_fdb_info info;
enum switchdev_notifier_type notifier_type;
if (WARN_ON(!rd))
return;
notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
: SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
info = (struct switchdev_notifier_vxlan_fdb_info){
.remote_ip = rd->remote_ip,
.remote_port = rd->remote_port,
.remote_vni = rd->remote_vni,
.remote_ifindex = rd->remote_ifindex,
.vni = fdb->vni,
};
memcpy(info.eth_addr, fdb->eth_addr, ETH_ALEN);
call_switchdev_notifiers(notifier_type, vxlan->dev,
&info.info);
}
static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type)
{
switch (type) {
case RTM_NEWNEIGH:
vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, true);
break;
case RTM_DELNEIGH:
vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, false);
break;
}
__vxlan_fdb_notify(vxlan, fdb, rd, type);
}
static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
{ {
struct vxlan_dev *vxlan = netdev_priv(dev); struct vxlan_dev *vxlan = netdev_priv(dev);

3
include/net/switchdev.h
View file

@ -145,6 +145,9 @@ enum switchdev_notifier_type {
SWITCHDEV_FDB_ADD_TO_DEVICE, SWITCHDEV_FDB_ADD_TO_DEVICE,
SWITCHDEV_FDB_DEL_TO_DEVICE, SWITCHDEV_FDB_DEL_TO_DEVICE,
SWITCHDEV_FDB_OFFLOADED, SWITCHDEV_FDB_OFFLOADED,
SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE,
}; };
struct switchdev_notifier_info { struct switchdev_notifier_info {

11
include/net/vxlan.h
View file

@ -6,6 +6,7 @@
#include <net/udp_tunnel.h> #include <net/udp_tunnel.h>
#include <net/dst_metadata.h> #include <net/dst_metadata.h>
#include <net/rtnetlink.h> #include <net/rtnetlink.h>
#include <net/switchdev.h>
/* VXLAN protocol (RFC 7348) header: /* VXLAN protocol (RFC 7348) header:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@ -409,4 +410,14 @@ static inline bool netif_is_vxlan(const struct net_device *dev)
!strcmp(dev->rtnl_link_ops->kind, "vxlan"); !strcmp(dev->rtnl_link_ops->kind, "vxlan");
} }
struct switchdev_notifier_vxlan_fdb_info {
struct switchdev_notifier_info info; /* must be first */
union vxlan_addr remote_ip;
__be16 remote_port;
__be32 remote_vni;
u32 remote_ifindex;
u8 eth_addr[ETH_ALEN];
__be32 vni;
};
#endif #endif