ovs-bugtool: Avoid running ethtool on non-physical devices.

There can be possibilities where there are hundreds of OVS
internal devices. In such a situation, running ovs-bugtool
can take a very long time to complete as multiple ethtool
commands are run on each interface in /sys/class/net. Once
the ovs-bugtool completes, most of the ethtool command outputs
would be incomplete with "timeouts" as we only give 30 seconds
for CAP_NETWORK_STATUS.

With the following patch, we only run ethtools on those interfaces
that have an associated "device". All physical interfaces have
this entry in /sys/class/net/${interface_name}/. Virtual interfaces
can have this entry too, if it has an underlying virtual device.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>

diff --git a/utilities/bugtool/ovs-bugtool.in b/utilities/bugtool/ovs-bugtool.in
index 3daf9cc..3bafa13 100755 (executable)
--- a/utilities/bugtool/ovs-bugtool.in
+++ b/utilities/bugtool/ovs-bugtool.in
@@ -583,13 +583,14 @@ exclude those logs from the archive.
             f = open('/sys/class/net/%s/type' % p, 'r')
             t = f.readline()
             f.close()
-            if int(t) == 1:
+            if os.path.islink('/sys/class/net/%s/device' % p) and int(t) == 1:
                 # ARPHRD_ETHER
                 cmd_output(CAP_NETWORK_STATUS, [ETHTOOL, p])
                 cmd_output(CAP_NETWORK_STATUS, [ETHTOOL, '-S', p])
                 cmd_output(CAP_NETWORK_STATUS, [ETHTOOL, '-k', p])
                 cmd_output(CAP_NETWORK_STATUS, [ETHTOOL, '-i', p])
                 cmd_output(CAP_NETWORK_STATUS, [ETHTOOL, '-c', p])
+            if int(t) == 1:
                 cmd_output(CAP_NETWORK_STATUS,
                            [TC, '-s', '-d', 'class', 'show', 'dev', p])
         except: