macvtap: add TUNSETQUEUE ioctl

This patch adds TUNSETQUEUE ioctl to let userspace can temporarily disable or
enable a queue of macvtap. This is used to be compatible at API layer of tuntap
to simplify the userspace to manage the queues. This is done through introducing
a linked list to track all taps while using vlan->taps array to only track
active taps.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
index 62d8bda67874..19121331a5ed 100644
--- a/include/linux/if_macvlan.h
+++ b/include/linux/if_macvlan.h
@@ -69,8 +69,12 @@ struct macvlan_dev {
         u16                     flags;
         int (*receive)(struct sk_buff *skb);
         int (*forward)(struct net_device *dev, struct sk_buff *skb);
+        /* This array tracks active taps. */
         struct macvtap_queue    *taps[MAX_MACVTAP_QUEUES];
+        /* This list tracks all taps (both enabled and disabled) */
+        struct list_head        queue_list;
         int                     numvtaps;
+        int                     numqueues;
         int                     minor;
 };