1 files changed, 27 insertions, 0 deletions

diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index 2470f541af50..848e3584d7c8 100644
--- a/include/uapi/linux/virtio_net.h
+++ b/include/uapi/linux/virtio_net.h
@@ -51,6 +51,8 @@
 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20   /* Extra RX mode control support */
 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21  /* Guest can announce device on the
                                          * network */
+#define VIRTIO_NET_F_MQ 22      /* Device supports Receive Flow
+                                         * Steering */
 
 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
 #define VIRTIO_NET_S_ANNOUNCE   2       /* Announcement is needed */
@@ -60,6 +62,11 @@ struct virtio_net_config {
         __u8 mac[6];
         /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
         __u16 status;
+        /* Maximum number of each of transmit and receive queues;
+         * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
+         * Legal values are between 1 and 0x8000
+         */
+        __u16 max_virtqueue_pairs;
 } __attribute__((packed));
 
 /* This is the first element of the scatter-gather list.  If you don't
@@ -166,4 +173,24 @@ struct virtio_net_ctrl_mac {
 #define VIRTIO_NET_CTRL_ANNOUNCE       3
  #define VIRTIO_NET_CTRL_ANNOUNCE_ACK         0
 
+/*
+ * Control Receive Flow Steering
+ *
+ * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
+ * enables Receive Flow Steering, specifying the number of the transmit and
+ * receive queues that will be used. After the command is consumed and acked by
+ * the device, the device will not steer new packets on receive virtqueues
+ * other than specified nor read from transmit virtqueues other than specified.
+ * Accordingly, driver should not transmit new packets  on virtqueues other than
+ * specified.
+ */
+struct virtio_net_ctrl_mq {
+        u16 virtqueue_pairs;
+};
+
+#define VIRTIO_NET_CTRL_MQ   4
+ #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
+ #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
+ #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
+
 #endif /* _LINUX_VIRTIO_NET_H */