CSIT-408 sub-NDR latency measurements

- measure latency at 10% and 50% of found NDR.
- fix the accuracy reported by T-REX (round to usec)

Change-Id: I9fe2b5f942cb816db6fd0bb4262b48b8da6dac2f
Signed-off-by: Miroslav Miklus <mmiklus@cisco.com>

4 files changed, 99 insertions, 17 deletions

diff --git a/resources/libraries/python/DropRateSearch.py b/resources/libraries/python/DropRateSearch.py
index b0f15b25db..6346125592 100644
--- a/resources/libraries/python/DropRateSearch.py
+++ b/resources/libraries/python/DropRateSearch.py
@@ -99,6 +99,15 @@ class DropRateSearch(object):
         self._search_result_rate = None
 
     @abstractmethod
+    def get_latency(self):
+        """Return min/avg/max latency.
+
+        :return: Latency stats.
+        :rtype: list
+        """
+        pass
+
+    @abstractmethod
     def measure_loss(self, rate, frame_size, loss_acceptance,
                      loss_acceptance_type, traffic_type):
         """Send traffic from TG and measure count of dropped frames.
@@ -460,7 +469,7 @@ class DropRateSearch(object):
             raise Exception('Search FAILED')
         elif self._search_result in [SearchResults.SUCCESS,
                                      SearchResults.SUSPICIOUS]:
-            return self._search_result_rate, self._latency_stats
+            return self._search_result_rate, self.get_latency()
 
     def binary_search(self, b_min, b_max, traffic_type, skip_max_rate=False):
         """Binary search of rate with loss below acceptance criteria.
diff --git a/resources/libraries/python/TrafficGenerator.py b/resources/libraries/python/TrafficGenerator.py
index 0388179876..2a94912860 100644
--- a/resources/libraries/python/TrafficGenerator.py
+++ b/resources/libraries/python/TrafficGenerator.py
@@ -47,9 +47,6 @@ class TGDropRateSearchImpl(DropRateSearch):
             tg_instance.trex_stl_start_remote_exec(self.get_duration(),
                                                    unit_rate, frame_size,
                                                    traffic_type)
-            # Get latency stats from stream
-            self._latency_stats = tg_instance.get_latency()
-
             loss = tg_instance.get_loss()
             sent = tg_instance.get_sent()
             if self.loss_acceptance_type_is_percentage():
@@ -66,6 +63,16 @@ class TGDropRateSearchImpl(DropRateSearch):
         else:
             raise NotImplementedError("TG subtype not supported")
 
+    def get_latency(self):
+        """Return min/avg/max latency.
+
+        :return: Latency stats.
+        :rtype: list
+        """
+
+        tg_instance = BuiltIn().get_library_instance(
+            'resources.libraries.python.TrafficGenerator')
+        return tg_instance.get_latency_int()
 
 class TrafficGenerator(object):
     """Traffic Generator."""
@@ -107,8 +114,8 @@ class TrafficGenerator(object):
         """
         return self._received
 
-    def get_latency(self):
-        """Return min/avg/max latency.
+    def get_latency_int(self):
+        """Return rounded min/avg/max latency.
 
         :return: Latency stats.
         :rtype: list
@@ -476,9 +483,19 @@ class TrafficGenerator(object):
             self._received = self._result.split(', ')[1].split('=')[1]
             self._sent = self._result.split(', ')[2].split('=')[1]
             self._loss = self._result.split(', ')[3].split('=')[1]
+
             self._latency = []
-            self._latency.append(self._result.split(', ')[4].split('=')[1])
-            self._latency.append(self._result.split(', ')[5].split('=')[1])
+            lat_int_list = []
+            #round latency numbers
+            lat_str = self._result.split(', ')[4].split('=')[1]
+            for lat in lat_str.split("/"):
+                lat_int_list.append(int(float(lat)))
+            self._latency.append("/".join(str(tmp) for tmp in lat_int_list))
+            lat_int_list = []
+            lat_str = self._result.split(', ')[5].split('=')[1]
+            for lat in lat_str.split("/"):
+                lat_int_list.append(int(float(lat)))
+            self._latency.append("/".join(str(tmp) for tmp in lat_int_list))
 
     def stop_traffic_on_tg(self):
         """Stop all traffic on TG
diff --git a/resources/libraries/robot/performance.robot b/resources/libraries/robot/performance.robot
index c33905bc9a..ce4433c9cc 100644
--- a/resources/libraries/robot/performance.robot
+++ b/resources/libraries/robot/performance.robot
@@ -909,7 +909,19 @@
 | | Set Search Frame Size | ${framesize}
 | | Set Search Rate Type pps
 | | Linear Search | ${start_rate} | ${topology_type}
-| | ${rate_per_stream} | ${latency}= | Verify Search Result
+| | ${rate_per_stream} | ${lat}= | Verify Search Result
+| | ${tmp}= | Create List | 100%NDR | ${lat}
+| | ${latency}= | Create List | ${tmp}
+| | ${rate_50p}= | Evaluate | int(${rate_per_stream}*0.5)
+| | ${lat_50p}= | Measure latency | ${duration} | ${rate_50p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 50%NDR | ${lat_50p}
+| | Append To List | ${latency} | ${tmp}
+| | ${rate_10p}= | Evaluate | int(${rate_per_stream}*0.1)
+| | ${lat_10p}= | Measure latency | ${duration} | ${rate_10p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 10%NDR | ${lat_10p}
+| | Append To List | ${latency} | ${tmp}
 | | Display result of NDR search | ${rate_per_stream} | ${framesize} | 2
 | | ...                          | ${latency}
 | | Traffic should pass with no loss | ${duration} | ${rate_per_stream}pps
@@ -984,7 +996,19 @@
 | | Set Search Rate Type pps
 | | Set Binary Convergence Threshold | ${threshold}
 | | Binary Search | ${binary_min} | ${binary_max} | ${topology_type}
-| | ${rate_per_stream} | ${latency}= | Verify Search Result
+| | ${rate_per_stream} | ${lat}= | Verify Search Result
+| | ${tmp}= | Create List | 100%NDR | ${lat}
+| | ${latency}= | Create List | ${tmp}
+| | ${rate_50p}= | Evaluate | int(${rate_per_stream}*0.5)
+| | ${lat_50p}= | Measure latency | ${duration} | ${rate_50p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 50%NDR | ${lat_50p}
+| | Append To List | ${latency} | ${tmp}
+| | ${rate_10p}= | Evaluate | int(${rate_per_stream}*0.1)
+| | ${lat_10p}= | Measure latency | ${duration} | ${rate_10p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 10%NDR | ${lat_10p}
+| | Append To List | ${latency} | ${tmp}
 | | Display result of NDR search | ${rate_per_stream} | ${framesize} | 2
 | | ...                          | ${latency}
 | | Traffic should pass with no loss | ${duration} | ${rate_per_stream}pps
@@ -1063,7 +1087,19 @@
 | | Set Search Rate Type pps
 | | Set Binary Convergence Threshold | ${threshold}
 | | Combined Search | ${start_rate} | ${topology_type}
-| | ${rate_per_stream} | ${latency}= | Verify Search Result
+| | ${rate_per_stream} | ${lat}= | Verify Search Result
+| | ${tmp}= | Create List | 100%NDR | ${lat}
+| | ${latency}= | Create List | ${tmp}
+| | ${rate_50p}= | Evaluate | int(${rate_per_stream}*0.5)
+| | ${lat_50p}= | Measure latency | ${duration} | ${rate_50p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 50%NDR | ${lat_50p}
+| | Append To List | ${latency} | ${tmp}
+| | ${rate_10p}= | Evaluate | int(${rate_per_stream}*0.1)
+| | ${lat_10p}= | Measure latency | ${duration} | ${rate_10p}pps
+| | ...                           | ${framesize} | ${topology_type}
+| | ${tmp}= | Create List | 10%NDR | ${lat_10p}
+| | Append To List | ${latency} | ${tmp}
 | | Display result of NDR search | ${rate_per_stream} | ${framesize} | 2
 | | ...                          | ${latency}
 | | Traffic should pass with no loss | ${duration} | ${rate_per_stream}pps
@@ -1133,7 +1169,7 @@
 | | ... | *Example:*
 | | ...
 | | ... | \| Display result of NDR search \| 4400000 \| 64 \| 2 \
-| | ... | \| (0, 10/10/10) \|
+| | ... | \| [100%NDR, [10/10/10, 1/2/3]] \|
 | | [Arguments] | ${rate_per_stream} | ${framesize} | ${nr_streams}
 | | ...         | ${latency}
 | | ${framesize}= | Get Frame Size | ${framesize}
@@ -1144,9 +1180,9 @@
 | | ...              | append=yes
 | | Set Test Message | ${\n}FINAL_BANDWIDTH: ${bandwidth_total} Gbps (untagged)
 | | ...              | append=yes
-| | :FOR | ${idx} | ${lat} | IN ENUMERATE | @{latency}
-| | | Set Test Message | ${\n}LATENCY_STREAM_${idx}: ${lat} usec (min/avg/max)
-| | ...                | append=yes
+| | Set Test Message | ${\n}LATENCY usec [min/avg/max] | append=yes
+| | :FOR | ${lat} | IN | @{latency}
+| | | Set Test Message | ${\n}LAT_${lat[0]}: ${lat[1]} | append=yes
 
 | Display result of PDR search
 | | [Documentation]
@@ -1185,6 +1221,26 @@
 | | Set Test Message | ${\n}LOSS_ACCEPTANCE: ${loss_acceptance} ${loss_acceptance_type}
 | | ...              | append=yes
 
+| Measure latency
+| | [Documentation]
+| | ... | Send traffic at specified rate. Measure min/avg/max latency
+| | ...
+| | ... | *Arguments:*
+| | ... | - duration - Duration of traffic run [s]. Type: integer
+| | ... | - rate - Rate for sending packets. Type: string
+| | ... | - framesize - L2 Frame Size [B]. Type: integer
+| | ... | - topology_type - Topology type. Type: string
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Measure latency \| 10 \| 4.0mpps \| 64 \| 3-node-IPv4
+| | [Arguments] | ${duration} | ${rate} | ${framesize} | ${topology_type}
+| | Clear all counters on all DUTs
+| | Send traffic on tg | ${duration} | ${rate} | ${framesize}
+| | ...                | ${topology_type} | warmup_time=0
+| | Show statistics on all DUTs
+| | Run keyword and return | Get latency
+
 | Traffic should pass with no loss
 | | [Documentation]
 | | ... | Send traffic at specified rate. No packet loss is accepted at loss
diff --git a/resources/tools/t-rex/t-rex-stateless.py b/resources/tools/t-rex/t-rex-stateless.py
index 8a7f34b27a..95c6cb150a 100755
--- a/resources/tools/t-rex/t-rex-stateless.py
+++ b/resources/tools/t-rex/t-rex-stateless.py
@@ -347,8 +347,8 @@ def simple_burst(stream_a, stream_b, stream_lat_a, stream_lat_b, duration, rate,
     total_sent = 0
     lost_a = 0
     lost_b = 0
-    lat_a = 'NA'
-    lat_b = 'NA'
+    lat_a = "0/0/0"
+    lat_b = "0/0/0"
 
     try:
         # turn this off if too many logs