tap: import linux multiqueue constants

Import multiqueue constants from if_tun.h from 3.8-rc3. A new ifr flag
IFF_MULTI_QUEUE were introduced to create a multiqueue backend by calling
TUNSETIFF with the this flag and with the same interface name many times.

A new ioctl TUNSETQUEUE were introduced. When doing this ioctl with
IFF_DETACH_QUEUE, the queue were disabled in the linux kernel. When doing this
ioctl with IFF_ATTACH_QUEUE, the queue were enabled in the linux kernel.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/net/tap-linux.h b/net/tap-linux.h
index cb2a6d480ae89ff602c0e14964a00b88fdb27960..65087e1419de9873a2135734f4c1ac452bc154a4 100644 (file)
--- a/net/tap-linux.h
+++ b/net/tap-linux.h
@@ -29,6 +29,7 @@
 #define TUNSETSNDBUF   _IOW('T', 212, int)
 #define TUNGETVNETHDRSZ _IOR('T', 215, int)
 #define TUNSETVNETHDRSZ _IOW('T', 216, int)
+#define TUNSETQUEUE  _IOW('T', 217, int)
 
 #endif
 
@@ -36,6 +37,9 @@
 #define IFF_TAP                0x0002
 #define IFF_NO_PI      0x1000
 #define IFF_VNET_HDR   0x4000
+#define IFF_MULTI_QUEUE 0x0100
+#define IFF_ATTACH_QUEUE 0x0200
+#define IFF_DETACH_QUEUE 0x0400
 
 /* Features for GSO (TUNSETOFFLOAD). */
 #define TUN_F_CSUM     0x01    /* You can hand me unchecksummed packets. */