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hv_netvsc: Add the support of hibernation

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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>
This commit is contained in:
Dexuan Cui 2019-09-25 22:04:04 +00:00 committed by Sasha Levin
parent 2194c2eb67
commit 0efeea5fb1
2 changed files with 60 additions and 0 deletions
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3
drivers/net/hyperv/hyperv_net.h
View File

@ -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 */

57
drivers/net/hyperv/netvsc_drv.c
View File

@ -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,
},