hv_netvsc: Add handler for physical link speed change

On Hyper-V host 2016 and later, VMs gets an event message of the physical
link speed when vSwitch is changed. This patch handles this message, so
the updated link speed can be reported by ethtool.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 6 deletions

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 3e5356b6f825..82c8f6d47283 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -579,19 +579,32 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
 	struct netvsc_reconfig *event;
 	unsigned long flags;
 
-	/* Handle link change statuses only */
+	net = hv_get_drvdata(device_obj);
+
+	if (!net)
+		return;
+
+	ndev_ctx = netdev_priv(net);
+
+	/* Update the physical link speed when changing to another vSwitch */
+	if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
+		u32 speed;
+
+		speed = *(u32 *)((void *)indicate + indicate->
+				 status_buf_offset) / 10000;
+		ndev_ctx->speed = speed;
+		return;
+	}
+
+	/* Handle these link change statuses below */
 	if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 	    indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 	    indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 		return;
 
-	net = hv_get_drvdata(device_obj);
-
-	if (!net || net->reg_state != NETREG_REGISTERED)
+	if (net->reg_state != NETREG_REGISTERED)
 		return;
 
-	ndev_ctx = netdev_priv(net);
-
 	event = kzalloc(sizeof(*event), GFP_ATOMIC);
 	if (!event)
 		return;