[PATCH 5.10 54/73] hv_netvsc: Process NETDEV_GOING_DOWN on VF hot remove

Sasha Levin
2024-03-13T16:47:42Z

From: Long Li <longli@microsoft.com>

[ Upstream commit 34b06a2eee44d469f2e2c013a83e6dac3aff6411 ]

On VF hot remove, NETDEV_GOING_DOWN is sent to notify the VF is about to
go down. At this time, the VF is still sending/receiving traffic and we
request the VSP to switch datapath.

On completion, the datapath is switched to synthetic and we can proceed
with VF hot remove.

Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 9cae43da9867 ("hv_netvsc: Register VF in netvsc_probe if NET_DEVICE_REGISTER missed")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/hyperv/netvsc_drv.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 57a5ec098e7e0..057b1a9dde153 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2411,12 +2411,15 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
* During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network
* interface, there is only the CHANGE event and no UP or DOWN event.
*/
-static int netvsc_vf_changed(struct net_device *vf_netdev)
+static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event)
{
struct net_device_context *net_device_ctx;
struct netvsc_device *netvsc_dev;
struct net_device *ndev;
- bool vf_is_up = netif_running(vf_netdev);
+ bool vf_is_up = false;
+
+ if (event != NETDEV_GOING_DOWN)
+ vf_is_up = netif_running(vf_netdev);

ndev = get_netvsc_byref(vf_netdev);
if (!ndev)
@@ -2762,7 +2765,8 @@ static int netvsc_netdev_event(struct notifier_block *this,
case NETDEV_UP:
case NETDEV_DOWN:
case NETDEV_CHANGE:
- return netvsc_vf_changed(event_dev);
+ case NETDEV_GOING_DOWN:
+ return netvsc_vf_changed(event_dev, event);
default:
return NOTIFY_DONE;
}
--
2.43.0