ofproto.at: Fix races in rule eviciton tests

Bump timeout differences, because timeouts different by 1s might end up
to have the same position in the heap as rule_eviction_priority() uses
1024ms as a unit.

Also, use time/stop to avoid relying on how long an add-flow would take.

These tests were introduced by commit 6d56c1f.
("ofproto: Update rule's priority in eviction group.")

Acked-by: Ben Pfaff <[email protected]>
Acked-by: Kmindg G <[email protected]>
Signed-off-by: YAMAMOTO Takashi <[email protected]>

tests/ofproto.at

@@ -1375,27 +1375,34 @@ AT_CHECK(
    | ${PERL} $srcdir/uuidfilt.pl],
   [0], [<0>
 ])
+ovs-appctl time/stop
 # Add 4 flows.
 for in_port in 4 3 2 1; do
-    ovs-ofctl add-flow br0 hard_timeout=1${in_port},in_port=$in_port,actions=drop
+    ovs-ofctl add-flow br0 hard_timeout=$((10 + in_port * 3)),in_port=$in_port,actions=drop
 done
 AT_CHECK([ovs-ofctl dump-flows br0 | ofctl_strip | sort], [0], [dnl
- hard_timeout=11, in_port=1 actions=drop
- hard_timeout=12, in_port=2 actions=drop
- hard_timeout=13, in_port=3 actions=drop
- hard_timeout=14, in_port=4 actions=drop
+ hard_timeout=13, in_port=1 actions=drop
+ hard_timeout=16, in_port=2 actions=drop
+ hard_timeout=19, in_port=3 actions=drop
+ hard_timeout=22, in_port=4 actions=drop
 NXST_FLOW reply:
 ])
 # Sleep and modify the one that expires soonest
-sleep 2
+ovs-appctl time/warp 5000
 AT_CHECK([ovs-ofctl mod-flows br0 in_port=1,actions=drop])
-sleep 2
+# At this point the table would looks like:
+#  in_port   seconds to expire
+#     1            13
+#     2            11
+#     3            14
+#     4            17
+ovs-appctl time/warp 2000
 # Adding another flow will cause the one that expires soonest to be evicted.
 AT_CHECK([ovs-ofctl add-flow br0 in_port=5,actions=drop])
 AT_CHECK([ovs-ofctl dump-flows br0 | ofctl_strip | sort], [0], [dnl
- hard_timeout=11, in_port=1 actions=drop
- hard_timeout=13, in_port=3 actions=drop
- hard_timeout=14, in_port=4 actions=drop
+ hard_timeout=13, in_port=1 actions=drop
+ hard_timeout=19, in_port=3 actions=drop
+ hard_timeout=22, in_port=4 actions=drop
  in_port=5 actions=drop
 NXST_FLOW reply:
 ])
@@ -1414,26 +1421,33 @@ AT_CHECK(
 ])
 # Add 4 flows.
 for in_port in 4 3 2 1; do
-    ovs-ofctl add-flow br0 idle_timeout=1${in_port},in_port=$in_port,actions=drop
+    ovs-ofctl add-flow br0 idle_timeout=$((10 + in_port * 3)),in_port=$in_port,actions=drop
 done
+ovs-appctl time/stop
 AT_CHECK([ovs-ofctl dump-flows br0 | ofctl_strip | sort], [0], [dnl
- idle_timeout=11, in_port=1 actions=drop
- idle_timeout=12, in_port=2 actions=drop
- idle_timeout=13, in_port=3 actions=drop
- idle_timeout=14, in_port=4 actions=drop
+ idle_timeout=13, in_port=1 actions=drop
+ idle_timeout=16, in_port=2 actions=drop
+ idle_timeout=19, in_port=3 actions=drop
+ idle_timeout=22, in_port=4 actions=drop
 NXST_FLOW reply:
 ])
 # Sleep and receive on the flow that expires soonest
-sleep 2
+ovs-appctl time/warp 5000
 AT_CHECK([ovs-appctl netdev-dummy/receive p1 'in_port(1)'])
-sleep 2
+# At this point the table would looks like:
+#  in_port   seconds to expire
+#     1            13
+#     2            11
+#     3            14
+#     4            17
+ovs-appctl time/warp 2000
 # Adding another flow will cause the one that expires soonest to be evicted.
 AT_CHECK([ovs-ofctl add-flow br0 in_port=5,actions=drop])
 AT_CHECK([ovs-ofctl dump-flows br0 | ofctl_strip | sort], [0], [dnl
- idle_timeout=13, in_port=3 actions=drop
- idle_timeout=14, in_port=4 actions=drop
+ idle_timeout=19, in_port=3 actions=drop
+ idle_timeout=22, in_port=4 actions=drop
  in_port=5 actions=drop
- n_packets=1, n_bytes=60, idle_timeout=11, in_port=1 actions=drop
+ n_packets=1, n_bytes=60, idle_timeout=13, in_port=1 actions=drop
 NXST_FLOW reply:
 ])
 OVS_VSWITCHD_STOP