sriov: Support of SRIOV and Qemu PCI passthrough

Generic support of SRIOV has been added. Virtual interfaces can be
used in multiplei scenarios instead of physical NICs. Virtual
functions can be directly accessed from VM by PCI passthrough method.
Another option is to use VFs with vSwtich to evaluate impact
on performance.
Additonal modifications:
* Automatic detection of NIC details has been added to simplify
configuration.
* Obsoleted configuration options have been removed.
* Logging usage within vsperf script was fixed.
* Vsperf main was refactored and final cleanup function added.
* Configurable forwarding mode of TestPMD executed inside VM.

JIRA: VSPERF-198
Change-Id: I4a0d5d262b245d433b12419de79399fb5825a623
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>

1 files changed, 22 insertions, 34 deletions

diff --git a/src/dpdk/dpdk.py b/src/dpdk/dpdk.py
index f8cbbd81..36f1d055 100644
--- a/src/dpdk/dpdk.py
+++ b/src/dpdk/dpdk.py
@@ -23,7 +23,6 @@ from sys import platform as _platform
 import os
 import subprocess
 import logging
-import locale
 
 from tools import tasks
 from conf import settings
@@ -34,14 +33,22 @@ RTE_PCI_TOOL = os.path.join(
     settings.getValue('RTE_SDK'), 'tools', 'dpdk_nic_bind.py')
 
 _DPDK_MODULE_MANAGER = ModuleManager()
+
+# declare global NIC variables only as their content might not be known yet
+_NICS = []
+_NICS_PCI = []
+
 #
 # system management
 #
 
-
 def init():
     """Setup system for DPDK.
     """
+    global _NICS
+    global _NICS_PCI
+    _NICS = settings.getValue('NICS')
+    _NICS_PCI = list(nic['pci'] for nic in _NICS)
     if not _is_linux():
         _LOGGER.error('Not running on a compatible Linux version. Exiting...')
         return
@@ -175,54 +182,35 @@ def _bind_nics():
                            True)
 
         tasks.run_task(['sudo', RTE_PCI_TOOL, '--bind=' + _driver] +
-                       settings.getValue('WHITELIST_NICS'), _LOGGER,
-                       'Binding NICs %s...' %
-                       settings.getValue('WHITELIST_NICS'),
+                       _NICS_PCI, _LOGGER,
+                       'Binding NICs %s...' % _NICS_PCI,
                        True)
     except subprocess.CalledProcessError:
-        _LOGGER.error('Unable to bind NICs %s',
-                      str(settings.getValue('WHITELIST_NICS')))
-
-def _unbind_nics_get_driver():
-    """Check what driver the NICs should be bound to
-       after unbinding them from DPDK.
-    """
-    _driver_list = []
-    _output = subprocess.check_output([os.path.expanduser(RTE_PCI_TOOL), '--status'])
-    _my_encoding = locale.getdefaultlocale()[1]
-    for line in _output.decode(_my_encoding).split('\n'):
-        for nic in settings.getValue('WHITELIST_NICS'):
-            if nic in line:
-                _driver_list.append((line.split("unused=", 1)[1]))
-    return _driver_list
+        _LOGGER.error('Unable to bind NICs %s', str(_NICS_PCI))
 
 def _unbind_nics():
     """Unbind NICs using the Intel DPDK ``dpdk_nic_bind.py`` tool.
     """
-    nic_drivers = _unbind_nics_get_driver()
     try:
         tasks.run_task(['sudo', RTE_PCI_TOOL, '--unbind'] +
-                       settings.getValue('WHITELIST_NICS'), _LOGGER,
-                       'Unbinding NICs %s...' %
-                       str(settings.getValue('WHITELIST_NICS')),
+                       _NICS_PCI, _LOGGER,
+                       'Unbinding NICs %s...' % str(_NICS_PCI),
                        True)
     except subprocess.CalledProcessError:
-        _LOGGER.error('Unable to unbind NICs %s',
-                      str(settings.getValue('WHITELIST_NICS')))
+        _LOGGER.error('Unable to unbind NICs %s', str(_NICS_PCI))
     # Rebind NICs to their original drivers
     # using the Intel DPDK ``dpdk_nic_bind.py`` tool.
-    for i, nic in enumerate(settings.getValue('WHITELIST_NICS')):
+    for nic in _NICS:
         try:
-            if nic_drivers[i] != '':
+            if nic['driver']:
                 tasks.run_task(['sudo', RTE_PCI_TOOL, '--bind',
-                                nic_drivers[i], nic],
-                               _LOGGER, 'Binding NIC %s...' %
-                               nic,
+                                nic['driver'], nic['pci']],
+                               _LOGGER, 'Binding NIC %s to %s...' %
+                               (nic['pci'], nic['driver']),
                                True)
         except subprocess.CalledProcessError:
-            _LOGGER.error('Unable to bind NICs %s to drivers %s',
-                          str(settings.getValue('WHITELIST_NICS')),
-                          nic_drivers)
+            _LOGGER.error('Unable to bind NIC %s to driver %s',
+                          nic['pci'], nic['driver'])
 
 class Dpdk(object):
     """A context manager for the system init/cleanup.