netdev - Re: [PATCH net-next v9 1/4] virtio_net: Introduce VIRTIO_NET_F

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Date:   Sat, 28 Apr 2018 09:50:27 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Sridhar Samudrala <sridhar.samudrala@...el.com>
Cc:     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, jasowang@...hat.com,
        loseweigh@...il.com, aaron.f.brown@...el.com
Subject: Re: [PATCH net-next v9 1/4] virtio_net: Introduce
 VIRTIO_NET_F_STANDBY feature bit

Fri, Apr 27, 2018 at 07:06:57PM CEST, sridhar.samudrala@...el.com wrote:
>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.
>
>VIRTIO_NET_F_STANDBY is defined as bit 62 as it is a device feature bit.
>
>Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
>---
> drivers/net/virtio_net.c        | 2 +-
> include/uapi/linux/virtio_net.h | 3 +++
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>index 3b5991734118..51a085b1a242 100644
>--- a/drivers/net/virtio_net.c
>+++ b/drivers/net/virtio_net.c
>@@ -2999,7 +2999,7 @@ static struct virtio_device_id id_table[] = {
> 	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
> 	VIRTIO_NET_F_CTRL_MAC_ADDR, \
> 	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
>-	VIRTIO_NET_F_SPEED_DUPLEX
>+	VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY


This is not part of current qemu master (head 6f0c4706b35dead265509115ddbd2a8d1af516c1)
Were I can find the qemu code?

Also, I think it makes sense to push HW (qemu HW in this case) first
and only then the driver.



> 
> static unsigned int features[] = {
> 	VIRTNET_FEATURES,
>diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
>index 5de6ed37695b..a3715a3224c1 100644
>--- a/include/uapi/linux/virtio_net.h
>+++ b/include/uapi/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
>