[PATCH v3] lnst.Tests.TestPMD: add forward_mode branching

From: Jozef Urbanovsky <jurbanov(a)redhat.com&gt;

Adding parameter for the forward-mode selection of the
testPMD application running during the recipe.
Branching is currently supporting only "mac" and "macswap"
forward modes, where later needs the upstream DPDK to function
properly. Therefore DPDK needs to be built manually before the
recipe run and requires "dpdk-testpmd" utility.

Signed-off-by: Jozef Urbanovsky <jurbanov(a)redhat.com&gt;
---
 lnst/Tests/TestPMD.py | 36 ++++++++++++++++++++++++++----------
 1 file changed, 26 insertions(+), 10 deletions(-)

diff --git a/lnst/Tests/TestPMD.py b/lnst/Tests/TestPMD.py
index a92a42a..44c234f 100644
--- a/lnst/Tests/TestPMD.py
+++ b/lnst/Tests/TestPMD.py
@@ -4,27 +4,43 @@ import signal
 from lnst.Common.Parameters import Param, StrParam, IntParam, FloatParam
 from lnst.Common.Parameters import IpParam, DeviceOrIpParam
 from lnst.Tests.BaseTestModule import BaseTestModule, TestModuleError
+from lnst.Common.LnstError import LnstError
+
 
 class TestPMD(BaseTestModule):
     coremask = StrParam(mandatory=True)
     pmd_coremask = StrParam(mandatory=True)
 
-    #TODO make ListParam
+    # TODO make ListParam
+    foward_mode = StrParam(mandatory=True)
     nics = Param(mandatory=True)
-    peer_macs = Param(mandatory=True)
+    peer_macs = Param(mandatory=False)
 
     def format_command(self):
-        testpmd_args = ["testpmd",
-                "-c", self.params.coremask,
-                "-n", "4", "--socket-mem",
"1024,0"]
-        for nic in self.params.nics:
-            testpmd_args.extend(["-w", nic])
+        if self.params.forward_mode == "macswap":
+            testpmd_args = ["dpdk-testpmd", "--no-pci"]
+        else:
+            testpmd_args = ["testpmd"]
+
+        testpmd_args.extend(["-c", self.params.coremask,
+                             "-n", "4", "--socket-mem",
"1024,0"])
+
+        for i, nic in enumerate(self.params.nics):
+            if self.params.foward_mode == "mac":
+                testpmd_args.extend(["-w", nic])
+            elif self.params.foward_mode == "macswap":
+               
testpmd_args.extend([f"--vdev=net_virtio_user{i+1},path=/var/run/openvswitch/{nic}"])
+            else:
+                LnstError("Unsupported forward-mode parameter selected for the
TestPMD.")
 
-        testpmd_args.extend(["--", "-i", "--forward-mode",
"mac",
+        testpmd_args.extend(["--", "-i", "--forward-mode",
self.params.foward_mode,
                              "--coremask", self.params.pmd_coremask])
 
-        for i, mac in enumerate(self.params.peer_macs):
-            testpmd_args.extend(["--eth-peer", "{},{}".format(i,
mac)])
+        if self.params.foward_mode == "mac":
+            for i, mac in enumerate(self.params.peer_macs):
+                testpmd_args.extend(["--eth-peer", "{},{}".format(i,
mac)])
+        elif self.params.foward_mode == "macswap":
+            testpmd_args.extend(["--port-topology=loop"])
 
         return " ".join(testpmd_args)
 
-- 
2.29.2