netdev - [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio

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Message-Id: <1525734594-11134-1-git-send-email-sridhar.samudrala@intel.com>
Date:   Mon,  7 May 2018 16:09:54 -0700
From:   Sridhar Samudrala <sridhar.samudrala@...el.com>
To:     mst@...hat.com, 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, jasowang@...hat.com,
        loseweigh@...il.com, jiri@...nulli.us, aaron.f.brown@...el.com,
        qemu-devel@...gnu.org
Subject: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net

This feature bit can be used by hypervisor to indicate virtio_net device to
act as a standby for another device with the same MAC address.

I tested this with a small change to the patch to mark the STANDBY feature 'true'
by default as i am using libvirt to start the VMs.
Is there a way to pass the newly added feature bit 'standby' to qemu via libvirt
XML file?

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
 hw/net/virtio-net.c                         | 2 ++
 include/standard-headers/linux/virtio_net.h | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 90502fca7c..38b3140670 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2198,6 +2198,8 @@ 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("standby", VirtIONet, host_features, VIRTIO_NET_F_STANDBY,
+                      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 e9f255ea3f..01ec09684c 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_STANDBY      62    /* Act as standby for another device
+                                         * with the same MAC.
+                                         */
 #define VIRTIO_NET_F_SPEED_DUPLEX 63	/* Device set linkspeed and duplex */
 
 #ifndef VIRTIO_NET_NO_LEGACY
-- 
2.14.3