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[3/3] hv_netvsc: Process NETDEV_GOING_DOWN on VF hot remove

Message ID 1609895753-30445-3-git-send-email-longli@linuxonhyperv.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series [1/3] hv_netvsc: Check VF datapath when sending traffic to VF | expand

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Commit Message

Long Li Jan. 6, 2021, 1:15 a.m. UTC 
From: Long Li <longli@microsoft.com>

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>
---
 drivers/net/hyperv/netvsc_drv.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Comments

Haiyang Zhang Jan. 6, 2021, 5:36 p.m. UTC | #1 
> -----Original Message-----
> From: Long Li <longli@linuxonhyperv.com>
> Sent: Tuesday, January 5, 2021 8:16 PM
> To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang
> <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; Wei Liu <wei.liu@kernel.org>; David S. Miller
> <davem@davemloft.net>; Jakub Kicinski <kuba@kernel.org>; linux-
> hyperv@vger.kernel.org; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Cc: Long Li <longli@microsoft.com>
> Subject: [PATCH 3/3] hv_netvsc: Process NETDEV_GOING_DOWN on VF hot
> remove
> 
> From: Long Li <longli@microsoft.com>
> 
> 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>
diff mbox series

Patch

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 64ae5f4e974e..75b4d6703cf1 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2382,12 +2382,15 @@  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)
@@ -2716,7 +2719,8 @@  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;
 	}