nodedev: Increase the netlink socket buffer size to the one used by udev

When a number of SRIOV VFs (up to 128 on Intel XL710) is created:
for i in `seq 0 1`; do
  echo 63 > /sys/class/net/<interface>/device/sriov_numvfs
done

libvirtd will then report "udev_monitor_receive_device returned NULL"
error because the netlink socket buffer is not big enough (using GDB on
libudev confirmed this with ENOBUFFS) and thus some udev events were
dropped. This results in some devices being missing in the nodedev-list
output. This patch overrides the system's rmem_max limit but for that,
we need to make sure we've got root privileges.

https://bugzilla.redhat.com/show_bug.cgi?id=1450960

Signed-off-by: ning.bo <ning.bo9@zte.com.cn>
Signed-off-by: Erik Skultety <eskultet@redhat.com>

src/node_device/node_device_udev.c

@@ -1764,6 +1764,13 @@ static int nodeStateInitialize(bool privileged,
 
     udev_monitor_enable_receiving(priv->udev_monitor);
 
+    /* mimic udevd's behaviour and override the systems rmem_max limit in case
+     * there's a significant number of device 'add' events
+     */
+    if (geteuid() == 0)
+        udev_monitor_set_receive_buffer_size(priv->udev_monitor,
+                                             128 * 1024 * 1024);
+
     /* We register the monitor with the event callback so we are
      * notified by udev of device changes before we enumerate existing
      * devices because libvirt will simply recreate the device if we