On 02/13/2014 08:54 AM, Haiyang Zhang wrote:
> Without this patch, the "cat /sys/class/net/ethN/operstate" shows
> "unknown", and "ethtool ethN" shows "Link detected: yes", when VM
> boots up with or without vNIC connected.
>
> This patch fixed the problem.
>
> Signed-off-by: Haiyang Zhang <haiya...@microsoft.com>
> Reviewed-by: K. Y. Srinivasan <k...@microsoft.com>
> ---
>  drivers/net/hyperv/netvsc_drv.c |   53 
> ++++++++++++++++++++++++++++-----------
>  1 files changed, 38 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index 7756118..7141a19 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -88,8 +88,12 @@ static int netvsc_open(struct net_device *net)
>  {
>       struct net_device_context *net_device_ctx = netdev_priv(net);
>       struct hv_device *device_obj = net_device_ctx->device_ctx;
> +     struct netvsc_device *nvdev;
> +     struct rndis_device *rdev;
>       int ret = 0;
>  
> +     netif_carrier_off(net);
> +
>       /* Open up the device */
>       ret = rndis_filter_open(device_obj);
>       if (ret != 0) {
> @@ -99,6 +103,11 @@ static int netvsc_open(struct net_device *net)
>  
>       netif_start_queue(net);
>  
> +     nvdev = hv_get_drvdata(device_obj);
> +     rdev = nvdev->extension;
> +     if (!rdev->link_state)
> +             netif_carrier_on(net);
> +

Maybe you can just schedule the work here and then you can drop the
rtnl_lock in netvsc_link_change() ?
>       return ret;
>  }
>  
> @@ -229,23 +238,24 @@ void netvsc_linkstatus_callback(struct hv_device 
> *device_obj,
>       struct net_device *net;
>       struct net_device_context *ndev_ctx;
>       struct netvsc_device *net_device;
> +     struct rndis_device *rdev;
>  
>       net_device = hv_get_drvdata(device_obj);
> +     rdev = net_device->extension;
> +
> +     rdev->link_state = status != 1;
> +
>       net = net_device->ndev;
>  
> -     if (!net) {
> -             netdev_err(net, "got link status but net device "
> -                             "not initialized yet\n");
> +     if (!net || net->reg_state != NETREG_REGISTERED)
>               return;
> -     }
>  
> +     ndev_ctx = netdev_priv(net);
>       if (status == 1) {
> -             netif_carrier_on(net);
> -             ndev_ctx = netdev_priv(net);
>               schedule_delayed_work(&ndev_ctx->dwork, 0);
>               schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
>       } else {
> -             netif_carrier_off(net);
> +             schedule_delayed_work(&ndev_ctx->dwork, 0);
>       }
>  }
>  
> @@ -388,17 +398,35 @@ static const struct net_device_ops device_ops = {
>   * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
>   * another netif_notify_peers() into a delayed work, otherwise GARP packet
>   * will not be sent after quick migration, and cause network disconnection.
> + * Also, we update the carrier status here.
>   */
> -static void netvsc_send_garp(struct work_struct *w)
> +static void netvsc_link_change(struct work_struct *w)
>  {
>       struct net_device_context *ndev_ctx;
>       struct net_device *net;
>       struct netvsc_device *net_device;
> +     struct rndis_device *rdev;
> +     bool notify;
> +
> +     rtnl_lock();
>  
>       ndev_ctx = container_of(w, struct net_device_context, dwork.work);
>       net_device = hv_get_drvdata(ndev_ctx->device_ctx);
> +     rdev = net_device->extension;
>       net = net_device->ndev;
> -     netdev_notify_peers(net);
> +
> +     if (rdev->link_state) {
> +             netif_carrier_off(net);
> +             notify = false;
> +     } else {
> +             netif_carrier_on(net);
> +             notify = true;
> +     }
> +
> +     rtnl_unlock();
> +
> +     if (notify)
> +             netdev_notify_peers(net);
>  }
>  

Looks like this forces arp_notify here. Is it expected?

Other looks good.
>  
> @@ -414,13 +442,10 @@ static int netvsc_probe(struct hv_device *dev,
>       if (!net)
>               return -ENOMEM;
>  
> -     /* Set initial state */
> -     netif_carrier_off(net);
> -
>       net_device_ctx = netdev_priv(net);
>       net_device_ctx->device_ctx = dev;
>       hv_set_drvdata(dev, net);
> -     INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
> +     INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
>       INIT_WORK(&net_device_ctx->work, do_set_multicast);
>  
>       net->netdev_ops = &device_ops;
> @@ -443,8 +468,6 @@ static int netvsc_probe(struct hv_device *dev,
>       }
>       memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
>  
> -     netif_carrier_on(net);
> -
>       ret = register_netdev(net);
>       if (ret != 0) {
>               pr_err("Unable to register netdev.\n");

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