/*
* netvsc_linkstatus_callback - Link up/down notification
*/
static void netvsc_linkstatus_callback(struct hv_device *device_obj,
unsigned int status)
{
struct vm_device *device_ctx = to_vm_device(device_obj);
struct net_device *net = dev_get_drvdata(&device_ctx->device);
struct net_device_context *ndev_ctx;
DPRINT_ENTER(NETVSC_DRV);
if (!net) {
DPRINT_ERR(NETVSC_DRV, "got link status but net device "
"not initialized yet");
return;
}
if (status == 1) {
netif_carrier_on(net);
netif_wake_queue(net);
netif_notify_peers(net);
ndev_ctx = netdev_priv(net);
schedule_work(&ndev_ctx->work);
} else {
netif_carrier_off(net);
netif_stop_queue(net);
}
DPRINT_EXIT(NETVSC_DRV);
}
/*
* Send GARP packet to network peers after migrations.
* After Quick Migration, the network is not immediately operational in the
* current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
* another netif_notify_peers() into a scheduled work, otherwise GARP packet
* will not be sent after quick migration, and cause network disconnection.
*/
static void netvsc_send_garp(struct work_struct *w)
{
struct net_device_context *ndev_ctx;
struct net_device *net;
msleep(20);
ndev_ctx = container_of(w, struct net_device_context, work);
net = dev_get_drvdata(&ndev_ctx->device_ctx->device);
netif_notify_peers(net);
}
/*
* Send GARP packet to network peers after migrations.
* After Quick Migration, the network is not immediately operational in the
* 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_link_change(void *data)
{
struct delayed_work *w = (struct delayed_work *)data;
struct net_device_context *ndev_ctx;
struct net_device *net;
struct netvsc_device *net_device;
struct rndis_device *rdev;
bool notify, refresh = false;
char *argv[] = { "/etc/init.d/network", "restart", NULL };
char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
rtnl_lock();
ndev_ctx = container_of(w, struct net_device_context, dwork);
net_device = hv_get_drvdata(ndev_ctx->device_ctx);
rdev = net_device->extension;
net = net_device->ndev;
if (rdev->link_state) {
netif_carrier_off(net);
notify = false;
} else {
netif_carrier_on(net);
notify = true;
if (rdev->link_change) {
rdev->link_change = false;
refresh = true;
}
}
rtnl_unlock();
if (refresh)
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
if (notify)
netif_notify_peers(net);
}