xdp: T2666: initial XDP (generic mode) forwarding support

The CLI command 'set interfaces ethernet <interface> offload-options xdp" enables
the XDP generic mode on the given interface.

vyos@vyos:~$ show interfaces ethernet eth1
eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 xdpgeneric/id:151 qdisc mq state DOWN group default qlen 1000
    link/ether 00:50:56:bf:ef:aa brd ff:ff:ff:ff:ff:ff
    inet6 fe80::250:56ff:febf:efaa/64 scope link tentative
       valid_lft forever preferred_lft forever
    Description: fooa

XDP code is thankfully copied from [1], thank you for this nice tutorial.

NOTE: this is an experimental feature which might break your
forwarding/filtering.

[1]: https://medium.com/swlh/building-a-xdp-express-data-path-based-peering-router-20db4995da66

1 files changed, 21 insertions, 0 deletions

diff --git a/python/vyos/ifconfig/ethernet.py b/python/vyos/ifconfig/ethernet.py
index 12d1ec265..1bc63eec2 100644
--- a/python/vyos/ifconfig/ethernet.py
+++ b/python/vyos/ifconfig/ethernet.py
@@ -251,6 +251,23 @@ class EthernetIf(Interface):
         """
         return self.set_interface('ufo', state)
 
+    def set_xdp(self, enabled):
+        """
+        """
+        ifname = self.config['ifname']
+        cmd = f'ip link set dev {ifname} xdp off'
+        if enabled:
+            # use 'xdpgeneric' for the time beeing until we can detect supported
+            # drivers or have a lookup table of whatever kind. This then can be
+            # replaced by xdpdrv
+            cmd = f'ip -force link set dev {ifname} xdpgeneric obj /usr/share/vyos/ebpf/xdp_router.o'
+        try:
+            return self._cmd(cmd)
+        except:
+            from vyos import ConfigError
+            raise ConfigError('Error: Device does not allow enslaving to a bridge.')
+
+
     def set_ring_buffer(self, b_type, b_size):
         """
         Example:
@@ -306,6 +323,10 @@ class EthernetIf(Interface):
         value = tmp if (tmp != None) else 'off'
         self.set_ufo(value)
 
+        # UDP fragmentation offloading
+        tmp = dict_search('offload_options.xdp', config)
+        self.set_xdp(tmp != None) # enable or disable
+
         # Set physical interface speed and duplex
         if {'speed', 'duplex'} <= set(config):
             speed = config.get('speed')