hv_netvsc: Process NETDEV_GOING_DOWN on VF hot remove

On VF hot remove, NETDEV_GOING_DOWN is sent to notify the VF is about to
go down. At this time, the VF is still sending/receiving traffic and we
request the VSP to switch datapath.

On completion, the datapath is switched to synthetic and we can proceed
with VF hot remove.

Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 64ae5f4..75b4d67 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2382,12 +2382,15 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
  * During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network
  * interface, there is only the CHANGE event and no UP or DOWN event.
  */
-static int netvsc_vf_changed(struct net_device *vf_netdev)
+static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event)
 {
        struct net_device_context *net_device_ctx;
        struct netvsc_device *netvsc_dev;
        struct net_device *ndev;
-       bool vf_is_up = netif_running(vf_netdev);
+       bool vf_is_up = false;
+
+       if (event != NETDEV_GOING_DOWN)
+               vf_is_up = netif_running(vf_netdev);
 
        ndev = get_netvsc_byref(vf_netdev);
        if (!ndev)
@@ -2716,7 +2719,8 @@ static int netvsc_netdev_event(struct notifier_block *this,
        case NETDEV_UP:
        case NETDEV_DOWN:
        case NETDEV_CHANGE:
-               return netvsc_vf_changed(event_dev);
+       case NETDEV_GOING_DOWN:
+               return netvsc_vf_changed(event_dev, event);
        default:
                return NOTIFY_DONE;
        }