[RFC net-next 1/7] selftests: openvswitch: Support explicit tunnel port creation.

Aaron Conole
2024-06-13T18:13:47Z

The OVS module can operate in conjunction with various types of
tunnel ports. These are created as either explicit tunnel vport
types, OR by creating a tunnel interface which acts as an anchor
for the lightweight tunnel support.

This patch adds the ability to add tunnel ports to an OVS
datapath for testing various scenarios with tunnel ports. With
this addition, the vswitch "plumbing" will at least be able to
push packets around using the tunnel vports. Future patches
will add support for setting required tunnel metadata for lwts
in the datapath. The end goal will be to push packets via these
tunnels, and will be used in an upcoming commit for testing the
path MTU.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
.../selftests/net/openvswitch/ovs-dpctl.py | 81 +++++++++++++++++--
1 file changed, 75 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
index 1dd057afd3fb..56f6bd162d3e 100644
--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
@@ -10,6 +10,7 @@ import ipaddress
import logging
import multiprocessing
import re
+import socket
import struct
import sys
import time
@@ -29,6 +30,7 @@ try:
from pyroute2.netlink.exceptions import NetlinkError
from pyroute2.netlink.generic import GenericNetlinkSocket
import pyroute2
+ import pyroute2.iproute

except ModuleNotFoundError:
print("Need to install the python pyroute2 package >= 0.6.")
@@ -1617,7 +1619,7 @@ class OvsVport(GenericNetlinkSocket):
("OVS_VPORT_ATTR_PORT_NO", "uint32"),
("OVS_VPORT_ATTR_TYPE", "uint32"),
("OVS_VPORT_ATTR_NAME", "asciiz"),
- ("OVS_VPORT_ATTR_OPTIONS", "none"),
+ ("OVS_VPORT_ATTR_OPTIONS", "vportopts"),
("OVS_VPORT_ATTR_UPCALL_PID", "array(uint32)"),
("OVS_VPORT_ATTR_STATS", "vportstats"),
("OVS_VPORT_ATTR_PAD", "none"),
@@ -1625,6 +1627,13 @@ class OvsVport(GenericNetlinkSocket):
("OVS_VPORT_ATTR_NETNSID", "uint32"),
)

+ class vportopts(nla):
+ nla_map = (
+ ("OVS_TUNNEL_ATTR_UNSPEC", "none"),
+ ("OVS_TUNNEL_ATTR_DST_PORT", "uint16"),
+ ("OVS_TUNNEL_ATTR_EXTENSION", "none"),
+ )
+
class vportstats(nla):
fields = (
("rx_packets", "=Q"),
@@ -1693,7 +1702,7 @@ class OvsVport(GenericNetlinkSocket):
raise ne
return reply

- def attach(self, dpindex, vport_ifname, ptype):
+ def attach(self, dpindex, vport_ifname, ptype, dport, lwt):
msg = OvsVport.ovs_vport_msg()

msg["cmd"] = OVS_VPORT_CMD_NEW
@@ -1702,12 +1711,43 @@ class OvsVport(GenericNetlinkSocket):
msg["dpifindex"] = dpindex
port_type = OvsVport.str_to_type(ptype)

- msg["attrs"].append(["OVS_VPORT_ATTR_TYPE", port_type])
msg["attrs"].append(["OVS_VPORT_ATTR_NAME", vport_ifname])
msg["attrs"].append(
["OVS_VPORT_ATTR_UPCALL_PID", [self.upcall_packet.epid]]
)

+ TUNNEL_DEFAULTS = [("geneve", 6081),
+ ("vxlan", 4798)]
+
+ for tnl in TUNNEL_DEFAULTS:
+ if ptype == tnl[0]:
+ if not dport:
+ dport = tnl[1]
+
+ if not lwt:
+ vportopt = OvsVport.ovs_vport_msg.vportopts()
+ vportopt["attrs"].append(
+ ["OVS_TUNNEL_ATTR_DST_PORT", socket.htons(dport)]
+ )
+ msg["attrs"].append(
+ ["OVS_VPORT_ATTR_OPTIONS", vportopt]
+ )
+ else:
+ port_type = OvsVport.OVS_VPORT_TYPE_NETDEV
+ ipr = pyroute2.iproute.IPRoute()
+
+ if tnl[0] == "geneve":
+ ipr.link("add", ifname=vport_ifname, kind=tnl[0],
+ geneve_port=dport,
+ geneve_collect_metadata=True,
+ geneve_udp_zero_csum6_rx=1)
+ elif tnl[0] == "vxlan":
+ ipr.link("add", ifname=vport_ifname, kind=tnl[0],
+ vxlan_learning=0, vxlan_collect_metadata=1,
+ vxlan_udp_zero_csum6_rx=1, vxlan_port=dport)
+ break
+ msg["attrs"].append(["OVS_VPORT_ATTR_TYPE", port_type])
+
try:
reply = self.nlm_request(
msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
@@ -2053,12 +2093,19 @@ def print_ovsdp_full(dp_lookup_rep, ifindex, ndb=NDB(), vpl=OvsVport()):
for iface in ndb.interfaces:
rep = vpl.info(iface.ifname, ifindex)
if rep is not None:
+ opts = ""
+ vpo = rep.get_attr("OVS_VPORT_ATTR_OPTIONS")
+ if vpo:
+ dpo = vpo.get_attr("OVS_TUNNEL_ATTR_DST_PORT")
+ if dpo:
+ opts += " tnl-dport:%s" % socket.ntohs(dpo)
print(
- " port %d: %s (%s)"
+ " port %d: %s (%s%s)"
% (
rep.get_attr("OVS_VPORT_ATTR_PORT_NO"),
rep.get_attr("OVS_VPORT_ATTR_NAME"),
OvsVport.type_to_str(rep.get_attr("OVS_VPORT_ATTR_TYPE")),
+ opts,
)
)

@@ -2120,12 +2167,30 @@ def main(argv):
"--ptype",
type=str,
default="netdev",
- choices=["netdev", "internal"],
+ choices=["netdev", "internal", "geneve", "vxlan"],
help="Interface type (default netdev)",
)
+ addifcmd.add_argument(
+ "-p",
+ "--dport",
+ type=int,
+ default=0,
+ help="Destination port (0 for default)"
+ )
+ addifcmd.add_argument(
+ "-l",
+ "--lwt",
+ type=bool,
+ default=True,
+ help="Use LWT infrastructure instead of vport (default true)."
+ )
delifcmd = subparsers.add_parser("del-if")
delifcmd.add_argument("dpname", help="Datapath Name")
delifcmd.add_argument("delif", help="Interface name for adding")
+ delifcmd.add_argument("-d",
+ "--dellink",
+ type=bool, default=False,
+ help="Delete the link as well.")

dumpflcmd = subparsers.add_parser("dump-flows")
dumpflcmd.add_argument("dumpdp", help="Datapath Name")
@@ -2186,7 +2251,8 @@ def main(argv):
print("DP '%s' not found." % args.dpname)
return 1
dpindex = rep["dpifindex"]
- rep = ovsvp.attach(rep["dpifindex"], args.addif, args.ptype)
+ rep = ovsvp.attach(rep["dpifindex"], args.addif, args.ptype,
+ args.dport, args.lwt)
msg = "vport '%s'" % args.addif
if rep and rep["header"]["error"] is None:
msg += " added."
@@ -2207,6 +2273,9 @@ def main(argv):
msg += " removed."
else:
msg += " failed to remove."
+ if args.dellink:
+ ipr = pyroute2.iproute.IPRoute()
+ ipr.link("del", index=ipr.link_lookup(ifname=args.delif)[0])
elif hasattr(args, "dumpdp"):
rep = ovsdp.info(args.dumpdp, 0)
if rep is None:
--
2.45.1