[dts] [PATCH for-next v3 7/7] tests/TestSuite_nic_single_core_perf: Report the results in JSON format

[Patrick MacArthur <pmacarth@iol.unh.edu>]

Add a JSON report file in addition to the texttable report file, for
easier consumption by other automated tools. The JSON output produced
will look like:

    {
      "results": [
        {
          "parameters": { "frame_size": 64, "txd/rxd": 1024 },
          "throughput": { "result": "PASS", "delta": -0.452, "unit": "Mpps" }
        },
        /* ... */
      ]
    }

Each entry in the results list is essentially a table row. The
parameters "frame_size" and "txd/rxd" are the input parameters for
each given measurement. Each other element in the result dictionary
is an output measurement for the given measurement.

Signed-off-by: Patrick MacArthur <pmacarth@iol.unh.edu>
---
 tests/TestSuite_nic_single_core_perf.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index 860fc29f607f..d1b88c3d0157 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -33,6 +33,7 @@ DPDK Test suite.
 """
 
 import utils
+import json
 import os
 import re
 import time
@@ -251,6 +252,28 @@ class TestNicSingleCorePerf(TestCase):
         file_to_save.write(str(table))
         file_to_save.close()
 
+        json_obj = dict()
+        json_obj['nic_type'] = self.nic
+        json_obj['results'] = list()
+        for frame_size in self.frame_sizes:
+            for descriptor in self.descriptors:
+                row_in = self.test_result[frame_size][descriptor]
+                row_dict = dict()
+                row_dict['parameters'] = dict()
+                row_dict['parameters']['frame_size'] = dict(
+                    value=row_in['Frame Size'], unit='bytes')
+                row_dict['parameters']['txd/rxd'] = dict(
+                    value=row_in['TXD/RXD'], unit='descriptors')
+                delta = (float(row_in['Throughput'].split()[0]) -
+                         float(row_in['Expected Throughput'].split()[0]))
+                row_dict['throughput'] = dict(
+                    delta=delta, unit=row_in['Throughput'].split()[1])
+                json_obj['results'].append(row_dict)
+        with open(os.path.join(rst.path2Result,
+                               '{0:s}_single_core_perf.json'.format(
+                                   self.nic)), 'w') as fp:
+            json.dump(json_obj, fp)
+
     def tear_down(self):
         """
         Run after each test case.
-- 
2.14.1