qemu/net: flag to control the number of vectors a nic has

Add an option to specify the number of MSI-X vectors for PCI NIC cards. This
can also be used to disable MSI-X, for compatibility with old qemu. This
option currently only affects virtio cards.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/net.h b/net.h
index a1c4d2c0e2..6ba3624ffd 100644
--- a/net.h
+++ b/net.h
@@ -84,6 +84,9 @@ int do_set_link(Monitor *mon, const char *name, const char *up_or_down);
 /* NIC info */
 
 #define MAX_NICS 8
+enum {
+	NIC_NVECTORS_UNSPECIFIED = -1
+};
 
 struct NICInfo {
     uint8_t macaddr[6];
@@ -94,6 +97,7 @@ struct NICInfo {
     void *private;
     int used;
     int bootable;
+    int nvectors;
 };
 
 extern int nb_nics;