vlib: startup multi-arch variant configuration

Support for startup node multi-arch variant selection through startup.conf.
This is to facilitate unit, functional testing and benchmarking of non-default
multi-arch variant node code path. Also added parameters to make test, to
specific using multi-arch variants in unit testing.

Type: improvement

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
Change-Id: I94fd332bb629683b7a7dd770ee9f615a9a424060

test/test_node_variants.py

@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+import re
+import unittest
+import platform
+from framework import VppTestCase
+
+
+def checkX86():
+    return platform.machine() in ["x86_64", "AMD64"]
+
+
+def skipVariant(variant):
+    with open("/proc/cpuinfo") as f:
+        cpuinfo = f.read()
+
+    exp = re.compile(
+        r'(?:flags\s+:)(?:\s\w+)+(?:\s(' + variant + r'))(?:\s\w+)+')
+    match = exp.search(cpuinfo, re.DOTALL | re.MULTILINE)
+
+    return checkX86() and match is not None
+
+
+class TestNodeVariant(VppTestCase):
+    """ Test Node Variants """
+
+    @classmethod
+    def setUpConstants(cls, variant):
+        super(TestNodeVariant, cls).setUpConstants()
+        # find the position of node_variants in the cmdline args.
+
+        if checkX86():
+            node_variants = cls.vpp_cmdline.index("node { ") + 1
+            cls.vpp_cmdline[node_variants] = ("default { variant default } "
+                                              "ip4-rewrite { variant " +
+                                              variant + " } ")
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestNodeVariant, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestNodeVariant, cls).tearDownClass()
+
+    def setUp(self):
+        super(TestNodeVariant, self).setUp()
+
+    def tearDown(self):
+        super(TestNodeVariant, self).tearDown()
+
+    def getActiveVariant(self, node):
+        node_desc = self.vapi.cli("show node " + node)
+        self.logger.info(node_desc)
+
+        match = re.search(r'\s+(\S+)\s+(\d+)\s+(:?yes)',
+                          node_desc, re.DOTALL | re.MULTILINE)
+
+        return match.groups(0)
+
+    def checkVariant(self, variant):
+        """ Test node variants defaults """
+
+        variant_info = self.getActiveVariant("ip4-lookup")
+        self.assertEqual(variant_info[0], "default")
+
+        variant_info = self.getActiveVariant("ip4-rewrite")
+        self.assertEqual(variant_info[0], variant)
+
+
+class TestAVX512Variant(TestNodeVariant):
+    """ Test avx512 Node Variants """
+
+    VARIANT = "avx512"
+    LINUX_VARIANT = VARIANT + "f"
+
+    @classmethod
+    def setUpConstants(cls):
+        super(TestAVX512Variant, cls).setUpConstants(cls.VARIANT)
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestAVX512Variant, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestAVX512Variant, cls).tearDownClass()
+
+    @unittest.skipUnless(skipVariant(LINUX_VARIANT),
+                         VARIANT + " not a supported variant, skip.")
+    def test_avx512(self):
+        self.checkVariant(self.VARIANT)
+
+
+class TestAVX2Variant(TestNodeVariant):
+    """ Test avx2 Node Variants """
+
+    VARIANT = "avx2"
+
+    @classmethod
+    def setUpConstants(cls):
+        super(TestAVX2Variant, cls).setUpConstants(cls.VARIANT)
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestAVX2Variant, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestAVX2Variant, cls).tearDownClass()
+
+    @unittest.skipUnless(skipVariant(VARIANT),
+                         VARIANT + " not a supported variant, skip.")
+    def test_avx2(self):
+        self.checkVariant(self.VARIANT)