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udp_tunnel: add central NIC RX port offload infrastructure

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Cater to devices which:
 (a) may want to sleep in the callbacks;
 (b) only have IPv4 support;
 (c) need all the programming to happen while the netdev is up.

Drivers attach UDP tunnel offload info struct to their netdevs,
where they declare how many UDP ports of various tunnel types
they support. Core takes care of tracking which ports to offload.

Use a fixed-size array since this matches what almost all drivers
do, and avoids a complexity and uncertainty around memory allocations
in an atomic context.

Make sure that tunnel drivers don't try to replay the ports when
new NIC netdev is registered. Automatic replays would mess up
reference counting, and will be removed completely once all drivers
are converted.

v4:
 - use a #define NULL to avoid build issues with CONFIG_INET=n.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski
2020-07-09 17:42:46 -07:00
committed by David S. Miller
parent 84a4160e5a
commit cc4e3835ef
8 changed files with 983 additions and 5 deletions
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6
drivers/net/geneve.c
View File

@@ -1796,9 +1796,11 @@ static int geneve_netdevice_event(struct notifier_block *unused,
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
} else if (event == NETDEV_UNREGISTER) {
geneve_offload_rx_ports(dev, false);
if (!dev->udp_tunnel_nic_info)
geneve_offload_rx_ports(dev, false);
} else if (event == NETDEV_REGISTER) {
geneve_offload_rx_ports(dev, true);
if (!dev->udp_tunnel_nic_info)
geneve_offload_rx_ports(dev, true);
}
return NOTIFY_DONE;

6
drivers/net/vxlan.c
View File

@@ -4477,10 +4477,12 @@ static int vxlan_netdevice_event(struct notifier_block *unused,
struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
if (event == NETDEV_UNREGISTER) {
vxlan_offload_rx_ports(dev, false);
if (!dev->udp_tunnel_nic_info)
vxlan_offload_rx_ports(dev, false);
vxlan_handle_lowerdev_unregister(vn, dev);
} else if (event == NETDEV_REGISTER) {
vxlan_offload_rx_ports(dev, true);
if (!dev->udp_tunnel_nic_info)
vxlan_offload_rx_ports(dev, true);
} else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);