X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FDUTSetup.py;h=16acfba7adbc7de8bc14bea4a4ddf4267e907438;hp=396029a04f7164abf55418e44373ddc946505ae9;hb=6b86c6fa1315f5c12c55bdd289b4e2af7d710c39;hpb=844698802b99b67237250fd31e416081680354c0

diff --git a/resources/libraries/python/DUTSetup.py b/resources/libraries/python/DUTSetup.py
index 396029a04f..16acfba7ad 100644
--- a/resources/libraries/python/DUTSetup.py
+++ b/resources/libraries/python/DUTSetup.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2020 Cisco and/or its affiliates.
+# Copyright (c) 2021 Cisco and/or its affiliates.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
@@ -400,6 +400,20 @@ class DUTSetup:
         :type numvfs: int
         :raises RuntimeError: Failed to create VFs on PCI.
         """
+        cmd = f"test -f /sys/bus/pci/devices/{pf_pci_addr}/sriov_numvfs"
+        sriov_unsupported, _, _ = exec_cmd(node, cmd)
+        # if sriov_numvfs doesn't exist, then sriov_unsupported != 0
+        if int(sriov_unsupported):
+            if numvfs == 0:
+                # sriov is not supported and we want 0 VFs
+                # no need to do anything
+                return
+
+            raise RuntimeError(
+                f"Can't configure {numvfs} VFs on {pf_pci_addr} device "
+                f"on {node[u'host']} since it doesn't support SR-IOV."
+            )
+
         pci = pf_pci_addr.replace(u":", r"\:")
         command = f"sh -c \"echo {numvfs} | " \
             f"tee /sys/bus/pci/devices/{pci}/sriov_numvfs\""
@@ -543,61 +557,24 @@ class DUTSetup:
     def get_pci_dev_driver(node, pci_addr):
         """Get current PCI device driver on node.
 
-        .. note::
-            # lspci -vmmks 0000:00:05.0
-            Slot:   00:05.0
-            Class:  Ethernet controller
-            Vendor: Red Hat, Inc
-            Device: Virtio network device
-            SVendor:        Red Hat, Inc
-            SDevice:        Device 0001
-            PhySlot:        5
-            Driver: virtio-pci
-
         :param node: DUT node.
         :param pci_addr: PCI device address.
         :type node: dict
         :type pci_addr: str
         :returns: Driver or None
-        :raises RuntimeError: If PCI rescan or lspci command execution failed.
         :raises RuntimeError: If it is not possible to get the interface driver
             information from the node.
         """
-        ssh = SSH()
-        ssh.connect(node)
-
-        for i in range(3):
-            logger.trace(f"Try number {i}: Get PCI device driver")
-
-            cmd = f"lspci -vmmks {pci_addr}"
-            ret_code, stdout, _ = ssh.exec_command(cmd)
-            if int(ret_code):
-                raise RuntimeError(f"'{cmd}' failed on '{node[u'host']}'")
-
-            for line in stdout.splitlines():
-                if not line:
-                    continue
-                name = None
-                value = None
-                try:
-                    name, value = line.split(u"\t", 1)
-                except ValueError:
-                    if name == u"Driver:":
-                        return None
-                if name == u"Driver:":
-                    return value
-
-            if i < 2:
-                logger.trace(
-                    f"Driver for PCI device {pci_addr} not found, "
-                    f"executing pci rescan and retrying"
-                )
-                cmd = u"sh -c \"echo 1 > /sys/bus/pci/rescan\""
-                ret_code, _, _ = ssh.exec_command_sudo(cmd)
-                if int(ret_code) != 0:
-                    raise RuntimeError(f"'{cmd}' failed on '{node[u'host']}'")
-
-        return None
+        driver_path = f"/sys/bus/pci/devices/{pci_addr}/driver"
+        cmd = f"test -d {driver_path}"
+        ret_code, ret_val, _ = exec_cmd(node, cmd)
+        if int(ret_code):
+            # the directory doesn't exist which means the device is not bound
+            # to any driver
+            return None
+        cmd = f"basename $(readlink -f {driver_path})"
+        ret_val, _ = exec_cmd_no_error(node, cmd)
+        return ret_val.strip()
 
     @staticmethod
     def verify_kernel_module(node, module, force_load=False):
@@ -699,7 +676,7 @@ class DUTSetup:
                     )
                     # workaround to avoid installation of vpp-api-python
                     exec_cmd_no_error(
-                        node, u"rm -f {vpp_pkg_dir}vpp-api-python.deb",
+                        node, f"rm -f {vpp_pkg_dir}vpp-api-python.deb",
                         timeout=120, sudo=True
                     )
                     exec_cmd_no_error(
@@ -716,7 +693,7 @@ class DUTSetup:
                     )
                     # workaround to avoid installation of vpp-api-python
                     exec_cmd_no_error(
-                        node, u"rm -f {vpp_pkg_dir}vpp-api-python.rpm",
+                        node, f"rm -f {vpp_pkg_dir}vpp-api-python.rpm",
                         timeout=120, sudo=True
                     )
                     exec_cmd_no_error(