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authorDexuan Cui <decui@microsoft.com>2019-09-26 01:04:04 +0300
committerSasha Levin <sashal@kernel.org>2019-11-22 04:10:44 +0300
commit0efeea5fb15357f0a582c89c02ef0b6ef58defb5 (patch)
tree96d7c5e93f6e61e487fe58d8a9893aa3985ef68b /drivers/net/hyperv
parent2194c2eb6717f2ea7dc793ad9cbf44d359a3f696 (diff)
downloadlinux-0efeea5fb15357f0a582c89c02ef0b6ef58defb5.tar.xz
hv_netvsc: Add the support of hibernation
The existing netvsc_detach() and netvsc_attach() APIs make it easy to implement the suspend/resume callbacks. Signed-off-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net/hyperv')
-rw-r--r--drivers/net/hyperv/hyperv_net.h3
-rw-r--r--drivers/net/hyperv/netvsc_drv.c57
2 files changed, 60 insertions, 0 deletions
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 670ef682f268..ab7cc3dd3b33 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -952,6 +952,9 @@ struct net_device_context {
u32 vf_alloc;
/* Serial number of the VF to team with */
u32 vf_serial;
+
+ /* Used to temporarily save the config info across hibernation */
+ struct netvsc_device_info *saved_netvsc_dev_info;
};
/* Per channel data */
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 963509add611..b66b9af6d849 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2421,6 +2421,61 @@ static int netvsc_remove(struct hv_device *dev)
return 0;
}
+static int netvsc_suspend(struct hv_device *dev)
+{
+ struct net_device_context *ndev_ctx;
+ struct net_device *vf_netdev, *net;
+ struct netvsc_device *nvdev;
+ int ret;
+
+ net = hv_get_drvdata(dev);
+
+ ndev_ctx = netdev_priv(net);
+ cancel_delayed_work_sync(&ndev_ctx->dwork);
+
+ rtnl_lock();
+
+ nvdev = rtnl_dereference(ndev_ctx->nvdev);
+ if (nvdev == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+ if (vf_netdev)
+ netvsc_unregister_vf(vf_netdev);
+
+ /* Save the current config info */
+ ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
+
+ ret = netvsc_detach(net, nvdev);
+out:
+ rtnl_unlock();
+
+ return ret;
+}
+
+static int netvsc_resume(struct hv_device *dev)
+{
+ struct net_device *net = hv_get_drvdata(dev);
+ struct net_device_context *net_device_ctx;
+ struct netvsc_device_info *device_info;
+ int ret;
+
+ rtnl_lock();
+
+ net_device_ctx = netdev_priv(net);
+ device_info = net_device_ctx->saved_netvsc_dev_info;
+
+ ret = netvsc_attach(net, device_info);
+
+ rtnl_unlock();
+
+ kfree(device_info);
+ net_device_ctx->saved_netvsc_dev_info = NULL;
+
+ return ret;
+}
static const struct hv_vmbus_device_id id_table[] = {
/* Network guid */
{ HV_NIC_GUID, },
@@ -2435,6 +2490,8 @@ static struct hv_driver netvsc_drv = {
.id_table = id_table,
.probe = netvsc_probe,
.remove = netvsc_remove,
+ .suspend = netvsc_suspend,
+ .resume = netvsc_resume,
.driver = {
.probe_type = PROBE_FORCE_SYNCHRONOUS,
},