The permanent neighbor entry for fc00::1 is added into a wrong
namespace, so in order to reply to a ping from at_ns1, the
address of fc00::1 has to be discovered. Interfaces are attached
to OVS and we're removing flows that can forward ND requests
after initial setup. In case ND request wasn't sent and replied
before that, at_ns1 will not be able to discover fc00:1 and won't
reply to pings.
It's hard to catch this condition while running tests locally,
but for some reason our CI is failing consistently.
Fix the issue by removing all the unnecessary permanent entries
and just allowing all the normal traffic to flow through the
low priority OVS flow, so all addresses can be discovered.
Also adding one more wait to avoid occasional drops of the very
first packet.
Fixes: 2ff43c78c685 ("packets: Re-calculate IPv6 checksum only for first frag
upon modify.")
Signed-off-by: Ilya Maximets <[email protected]>
---
tests/system-traffic.at | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/tests/system-traffic.at b/tests/system-traffic.at
index 53ae80f4e..33108c5ab 100644
--- a/tests/system-traffic.at
+++ b/tests/system-traffic.at
@@ -237,17 +237,21 @@ ADD_NAMESPACES(at_ns0, at_ns1)
ADD_VETH(p0, at_ns0, br0, "fc00::1/96", e4:11:22:33:44:55)
ADD_VETH(p1, at_ns1, br0, "fc00::2/96", e4:11:22:33:44:54)
NS_CHECK_EXEC([at_ns0], [ip -6 neigh add fc00::3 lladdr e4:11:22:33:44:54 dev
p0])
-NS_CHECK_EXEC([at_ns0], [ip -6 neigh add fc00::2 lladdr e4:11:22:33:44:54 dev
p0])
-NS_CHECK_EXEC([at_ns0], [ip -6 neigh add fc00::1 lladdr e4:11:22:33:44:55 dev
p0])
dnl Linux seems to take a little time to get its IPv6 stack in order. Without
dnl waiting, we get occasional failures due to the following error:
dnl "connect: Cannot assign requested address"
OVS_WAIT_UNTIL([ip netns exec at_ns0 ping6 -c 1 fc00::2])
+OVS_WAIT_UNTIL([ip netns exec at_ns1 ping6 -c 1 fc00::1])
-AT_CHECK([ovs-ofctl del-flows -OOpenFlow15 br0])
-AT_CHECK([ovs-ofctl add-flow -OOpenFlow15 br0
in_port=ovs-p0,ipv6,ipv6_dst=fc00::3,ipv6_src=fc00::1,actions=set_field:fc00::2-\>ipv6_dst,ovs-p1])
-AT_CHECK([ovs-ofctl add-flow -OOpenFlow15 br0
in_port=ovs-p1,ipv6,ipv6_dst=fc00::1,ipv6_src=fc00::2,actions=set_field:fc00::3-\>ipv6_src,ovs-p0])
+AT_DATA([flows.txt], [dnl
+priority=100,in_port=ovs-p0,ipv6,ipv6_src=fc00::1,ipv6_dst=fc00::3,actions=set_field:fc00::2->ipv6_dst,ovs-p1
+priority=100,in_port=ovs-p1,ipv6,ipv6_src=fc00::2,ipv6_dst=fc00::1,actions=set_field:fc00::3->ipv6_src,ovs-p0
+priority=0,actions=NORMAL
+])
+
+AT_CHECK([ovs-ofctl del-flows br0])
+AT_CHECK([ovs-ofctl add-flows br0 flows.txt])
NS_CHECK_EXEC([at_ns0], [ping6 -q -c 3 -i 0.3 -w 2 fc00::3 | FORMAT_PING],
[0], [dnl
3 packets transmitted, 3 received, 0% packet loss, time 0ms
--
2.34.3
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