nat: configurable handoff frame queue size

Make number of worker handoff frame queue elements configurable as
a set nat frame-queue-nelts command. The default value is 64 which
is the same value that was previously hard-coded. The idea is that
allowing larger values can be useful in some cases, to avoid
congestion drops. Also add nat_set_fq_options API support and a
corresponding test case.

Type: improvement

Change-Id: I5c321eb2d7997f76fac2703d9c4a5b2516375db3
Signed-off-by: Elias Rudberg <elias.rudberg@bahnhof.net>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/plugins/nat/test/test_nat44_ei.py b/src/plugins/nat/test/test_nat44_ei.py
index 16a3376e9b2..e69e24b2911 100644
--- a/src/plugins/nat/test/test_nat44_ei.py
+++ b/src/plugins/nat/test/test_nat44_ei.py
@@ -858,6 +858,33 @@ class MethodHolder(VppTestCase):
             self.assertEqual(data, p[Raw].load)
 
 
+class TestNAT44EIAPI(MethodHolder):
+    """ NAT44EI API Test Cases """
+
+    fq_nelts = 512
+
+    def setUp(self):
+        super(TestNAT44EIAPI, self).setUp()
+        self.vapi.nat_set_fq_options(frame_queue_nelts=self.fq_nelts)
+        self.vapi.nat44_plugin_enable_disable(enable=1)
+
+    def tearDown(self):
+        super(TestNAT44EIAPI, self).tearDown()
+        if not self.vpp_dead:
+            self.vapi.nat44_plugin_enable_disable(enable=0)
+            self.vapi.cli("clear logging")
+
+    def test_show_frame_queue_nelts(self):
+        """ API test - worker handoff frame queue elements """
+        nat_config = self.vapi.nat_show_fq_options()
+        self.assertEqual(self.fq_nelts, nat_config.frame_queue_nelts)
+        self.vapi.nat44_plugin_enable_disable(enable=0)
+        self.vapi.cli("set nat frame-queue-nelts 256")
+        self.vapi.nat44_plugin_enable_disable(enable=1)
+        nat_config = self.vapi.nat_show_fq_options()
+        self.assertEqual(256, nat_config.frame_queue_nelts)
+
+
 class TestNAT44EI(MethodHolder):
     """ NAT44EI Test Cases """