linux-kernel - [PATCH net 1/2] hv_netvsc: Switch the data path at the right time during hibernation

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Date:   Tue,  8 Sep 2020 21:07:32 -0700
From:   Dexuan Cui <decui@...rosoft.com>
To:     kuba@...nel.org, wei.liu@...nel.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        davem@...emloft.net, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        mikelley@...rosoft.com
Cc:     saeedm@...lanox.com, markb@...lanox.com,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH net 1/2] hv_netvsc: Switch the data path at the right time during hibernation

When netvsc_resume() is called, the mlx5 VF NIC has not been resumed yet,
so in the future the host might sliently fail the call netvsc_vf_changed()
-> netvsc_switch_datapath() there, even if the call works now.

Call netvsc_vf_changed() in the NETDEV_CHANGE event handler: at that time
the mlx5 VF NIC has been resumed.

Fixes: 19162fd4063a ("hv_netvsc: Fix hibernation for mlx5 VF driver")
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 81c5c70b616a..4a25886e2346 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2619,7 +2619,6 @@ 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;
-	struct net_device *vf_netdev;
 	int ret;
 
 	rtnl_lock();
@@ -2632,15 +2631,6 @@ static int netvsc_resume(struct hv_device *dev)
 	netvsc_devinfo_put(device_info);
 	net_device_ctx->saved_netvsc_dev_info = NULL;
 
-	/* A NIC driver (e.g. mlx5) may keep the VF network interface across
-	 * hibernation, but here the data path is implicitly switched to the
-	 * netvsc NIC since the vmbus channel is closed and re-opened, so
-	 * netvsc_vf_changed() must be used to switch the data path to the VF.
-	 */
-	vf_netdev = rtnl_dereference(net_device_ctx->vf_netdev);
-	if (vf_netdev && netvsc_vf_changed(vf_netdev) != NOTIFY_OK)
-		ret = -EINVAL;
-
 	rtnl_unlock();
 
 	return ret;
@@ -2701,6 +2691,7 @@ static int netvsc_netdev_event(struct notifier_block *this,
 		return netvsc_unregister_vf(event_dev);
 	case NETDEV_UP:
 	case NETDEV_DOWN:
+	case NETDEV_CHANGE:
 		return netvsc_vf_changed(event_dev);
 	default:
 		return NOTIFY_DONE;
-- 
2.19.1