[PATCH v2] tools: fix issue with virtio interfaces

[souvikdey33 <sodey@sonusnet.com>]

This change is required to have the interface name for virtio interfaces.
When we execute the status command the for virtio inerfaces we get
Sample output without the change:
0000:00:04.0 'Virtio network device' if= drv=virtio-pci unused=virtio_pci,igb_uio
Though for other drivers this works.
Sample output with the change:
0000:00:04.0 'Virtio network device' if=eth0 drv=virtio-pci unused=virtio_pci,igb_uio

souvikdey33 (1):
  Signed-off-by: Souvik Dey <sodey@sonusnet.com>
  Fixes: 3da038604009 ("Signed-off-by: Souvik Dey <sodey@sonusnet.com>")
  
 tools/dpdk-devbind.py | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

-- 
>From 3da0386040092fcd54ee333ceff8c427a36c6b45 Mon Sep 17 00:00:00 2001
From: souvikdey33 <sodey@sonusnet.com>
Date: Thu, 25 Aug 2016 23:31:28 -0400
Subject: [PATCH v2] Signed-off-by: Souvik Dey <sodey@sonusnet.com>

When we execute the status command the for virtio inerfaces the interface name is not shown.
Sample output without the change.
0000:00:04.0 'Virtio network device' if= drv=virtio-pci unused=virtio_pci,igb_uio
Though for other this works.
---
 tools/dpdk-devbind.py | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/tools/dpdk-devbind.py b/tools/dpdk-devbind.py
index 9829e25..c0b46ee 100755
--- a/tools/dpdk-devbind.py
+++ b/tools/dpdk-devbind.py
@@ -36,7 +36,6 @@ import sys
 import os
 import getopt
 import subprocess
-import commands
 
 from os.path import exists, abspath, dirname, basename
 
@@ -224,14 +223,18 @@ def get_pci_device_details(dev_id):
         device[name] = value
     # check for a unix interface name
     sys_path = "/sys/bus/pci/devices/%s/net/" % dev_id
-    #The path for virtio devices are different. Get the correct path.
-	virtio = "/sys/bus/pci/devices/%s/" % dev_id
-    cmd = " ls %s | grep 'virt' " %virtio
-    virtio = commands.getoutput(cmd)
-    virtio_sys_path = "/sys/bus/pci/devices/%s/%s/net/" % (dev_id,virtio)
+    # the path for virtio devices are different, so get the correct path
+    virtio = "/sys/bus/pci/devices/%s/" % dev_id
+    ls = subprocess.Popen(['ls', virtio], stdout=subprocess.PIPE)
+    grep = subprocess.Popen('grep virt'.split(), stdin=ls.stdout,
+                            stdout=subprocess.PIPE)
+    ls.stdout.close()
+    virtio = grep.communicate()[0].rstrip()
+    ls.wait()
+    virtio_sys_path = "/sys/bus/pci/devices/%s/%s/net/" % (dev_id, virtio)
     if exists(sys_path):
         device["Interface"] = ",".join(os.listdir(sys_path))
-    elif exists(virt_path):
+    elif exists(virtio_sys_path):
         device["Interface"] = ",".join(os.listdir(virtio_sys_path))
     else:
         device["Interface"] = ""
-- 
2.9.3.windows.1