netdev - [RFC PATCH 1/1] qemu: Introduce VIRTIO_NET_F_BACKUP feature bit to virtio

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Date:   Thu, 11 Jan 2018 21:58:40 -0800
From:   Sridhar Samudrala <sridhar.samudrala@...el.com>
To:     mst@...hat.com, stephen@...workplumber.org, davem@...emloft.net,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, jesse.brandeburg@...el.com,
        alexander.h.duyck@...el.com, kubakici@...pl,
        sridhar.samudrala@...el.com
Subject: [RFC PATCH 1/1] qemu: Introduce VIRTIO_NET_F_BACKUP feature bit to virtio_net

This feature bit can be used by hypervisor to indicate virtio_net device to
act as a backup for another device with the same MAC address.
    
Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index cd63659140..fa47e723b9 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2193,6 +2193,8 @@ static Property virtio_net_properties[] = {
                      true),
     DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
     DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
+    DEFINE_PROP_BIT64("backup", VirtIONet, host_features,
+                    VIRTIO_NET_F_BACKUP, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/standard-headers/linux/virtio_net.h b/include/standard-headers/linux/virtio_net.h
index 17c8531a22..6afca6dcaf 100644
--- a/include/standard-headers/linux/virtio_net.h
+++ b/include/standard-headers/linux/virtio_net.h
@@ -57,6 +57,9 @@
 					 * Steering */
 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23	/* Set MAC address */
 
+#define VIRTIO_NET_F_BACKUP	  62   /* Act as backup for another device
+					* with the same MAC.
+					*/
 #define VIRTIO_NET_F_SPEED_DUPLEX 63   /* Device set linkspeed and duplex */
 
 #ifndef VIRTIO_NET_NO_LEGACY