[PATCH lnst 14/17] recipes: switchdev: Add the multicast router nocache route recipe

[Yotam Gigi]

The test aims to test the flow of having traffic before the matching route
is created. The traffic creates an "unresolved route" in the kernel, which
holds the no-cache packets for some time interval. If a matching route is
put at that interval, it "resolves" the route and the stored packets are
forwarded according to it.

Test that that flow is functional by triggering traffic for a route before
the actual route is inserted.

The test algorithm is:
 - For 10 random (S,G) routes
    - Trigger traffic that would match the route
    - Test that a NOTIF_NOCACHE mroute notification was received
    - Add the actual route
    - Test that the route is functional

Signed-off-by: Yotam Gigi <yotamg(a)mellanox.com&gt;
---
 recipes/switchdev/mr-007-nocache-route.py  | 87 ++++++++++++++++++++++++++++++
 recipes/switchdev/mr-007-nocache-route.xml |  5 ++
 2 files changed, 92 insertions(+)
 create mode 100644 recipes/switchdev/mr-007-nocache-route.py
 create mode 100644 recipes/switchdev/mr-007-nocache-route.xml

diff --git a/recipes/switchdev/mr-007-nocache-route.py
b/recipes/switchdev/mr-007-nocache-route.py
new file mode 100644
index 0000000..0b1c3fb
--- /dev/null
+++ b/recipes/switchdev/mr-007-nocache-route.py
@@ -0,0 +1,87 @@
+"""
+Copyright 2017 Mellanox Technologies. All rights reserved.
+Licensed under the GNU General Public License, version 2 as
+published by the Free Software Foundation; see COPYING for details.
+"""
+
+__author__ = """
+yotamg(a)mellanox.com (Yotam Gigi)
+"""
+
+from lnst.Controller.Task import ctl
+from lnst.Common.Consts import MROUTE
+from TestLib import TestLib
+from time import sleep
+import random
+from mr_common import MrouteTest
+
+def mcgrp(num):
+    return "239.255.%d.%d" % (num/0x100, num%0x100)
+
+def nocache_route(mt, ivif, group, evifs):
+    mach_source_port = mt.sw_mach_conn[mt.vif2port[ivif]][0]
+
+    mt.send_mc_traffic(group, mach_source_port, 1)
+    mt.expect_mr_notifs(MROUTE.NOTIF_NOCACHE,
+                        source_ip = mach_source_port.get_ip(0),
+                        source_vif = ivif, group_ip = group)
+    source = str(mach_source_port.get_ip(0))
+    return mt.mroute_create(source, group, ivif, evifs)
+
+def random_ivif(vifs):
+    return random.choice(vifs)
+
+def random_evifs(vifs, ivif):
+    evifs = [evif for evif in vifs
+             if random.choice([True, False]) and evif != ivif]
+    return evifs
+
+def do_task(ctl, hosts, ifaces, aliases):
+    m1, m2, sw = hosts
+    m1_if1, m1_if2, m2_if1, m2_if2, m2_if3, m2_if4, sw_if1, \
+    sw_br_m1, sw_br_m2, sw_if3, sw_if4, sw_if5, sw_if2 = ifaces
+
+    sw_ports = [sw_if1, sw_if2, sw_if3, sw_if4, sw_if5]
+
+    tl = TestLib(ctl, aliases)
+    mt = MrouteTest(tl, hosts, ifaces)
+
+    sleep(30)
+    mt.init()
+
+    # add vifs
+    mt.add_vif(sw_if1, 0)
+    mt.add_vif(sw_if2, 1)
+    mt.add_vif(sw_if3, 2)
+    mt.add_vif(sw_if4, 3)
+    mt.add_vif(sw_if5, 4)
+    vifs = [0, 1, 2, 3, 4]
+
+    mroutes = []
+    for i in range(1, 10):
+        ivif = random_ivif(vifs)
+        evifs = random_evifs(vifs, ivif)
+        mroutes.append(nocache_route(mt, ivif, mcgrp(i), evifs))
+
+    for mroute in mroutes:
+        mt.mroute_remove(mroute)
+    
+    mt.fini()
+
+do_task(ctl, [ctl.get_host("machine1"),
+              ctl.get_host("machine2"),
+              ctl.get_host("switch")],
+        [ctl.get_host("machine1").get_interface("if1"),
+         ctl.get_host("machine1").get_interface("if2"),
+         ctl.get_host("machine2").get_interface("if1"),
+         ctl.get_host("machine2").get_interface("if2"),
+         ctl.get_host("machine2").get_interface("if3"),
+         ctl.get_host("machine2").get_interface("if4"),
+         ctl.get_host("switch").get_interface("if1"),
+         ctl.get_host("switch").get_interface("if2"),
+         ctl.get_host("switch").get_interface("if3"),
+         ctl.get_host("switch").get_interface("if4"),
+         ctl.get_host("switch").get_interface("if5"),
+         ctl.get_host("switch").get_interface("if6"),
+         ctl.get_host("switch").get_interface("br0")],
+        ctl.get_aliases())
diff --git a/recipes/switchdev/mr-007-nocache-route.xml
b/recipes/switchdev/mr-007-nocache-route.xml
new file mode 100644
index 0000000..519b580
--- /dev/null
+++ b/recipes/switchdev/mr-007-nocache-route.xml
@@ -0,0 +1,5 @@
+<lnstrecipe xmlns:xi="http://www.w3.org/2003/XInclude">
+    <xi:include href="default_aliases.xml" />
+    <xi:include href="mr_common_topology.xml" />
+    <task python="mr-007-nocache-route.py" />
+</lnstrecipe>
-- 
2.8.4