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Message-Id: <1729275922-17595-1-git-send-email-haiyangz@microsoft.com>
Date: Fri, 18 Oct 2024 11:25:22 -0700
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: linux-hyperv@...r.kernel.org,
netdev@...r.kernel.org
Cc: haiyangz@...rosoft.com,
kys@...rosoft.com,
wei.liu@...nel.org,
decui@...rosoft.com,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
stephen@...workplumber.org,
davem@...emloft.net,
linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Subject: [PATCH net,v3] hv_netvsc: Fix VF namespace also in synthetic NIC NETDEV_REGISTER event
The existing code moves VF to the same namespace as the synthetic NIC
during netvsc_register_vf(). But, if the synthetic device is moved to a
new namespace after the VF registration, the VF won't be moved together.
To make the behavior more consistent, add a namespace check for synthetic
NIC's NETDEV_REGISTER event (generated during its move), and move the VF
if it is not in the same namespace.
Cc: stable@...r.kernel.org
Fixes: c0a41b887ce6 ("hv_netvsc: move VF to same namespace as netvsc device")
Suggested-by: Stephen Hemminger <stephen@...workplumber.org>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Reviewed-by: Simon Horman <horms@...nel.org>
---
v3: Use RCT order as suggested by Simon.
v2: Move my fix to synthetic NIC's NETDEV_REGISTER event as suggested by Stephen.
---
drivers/net/hyperv/netvsc_drv.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 153b97f8ec0d..23180f7b67b6 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2798,6 +2798,31 @@ static struct hv_driver netvsc_drv = {
},
};
+/* Set VF's namespace same as the synthetic NIC */
+static void netvsc_event_set_vf_ns(struct net_device *ndev)
+{
+ struct net_device_context *ndev_ctx = netdev_priv(ndev);
+ struct net_device *vf_netdev;
+ int ret;
+
+ vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+ if (!vf_netdev)
+ return;
+
+ if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {
+ ret = dev_change_net_namespace(vf_netdev, dev_net(ndev),
+ "eth%d");
+ if (ret)
+ netdev_err(vf_netdev,
+ "Cannot move to same namespace as %s: %d\n",
+ ndev->name, ret);
+ else
+ netdev_info(vf_netdev,
+ "Moved VF to namespace with: %s\n",
+ ndev->name);
+ }
+}
+
/*
* On Hyper-V, every VF interface is matched with a corresponding
* synthetic interface. The synthetic interface is presented first
@@ -2810,6 +2835,11 @@ static int netvsc_netdev_event(struct notifier_block *this,
struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
int ret = 0;
+ if (event_dev->netdev_ops == &device_ops && event == NETDEV_REGISTER) {
+ netvsc_event_set_vf_ns(event_dev);
+ return NOTIFY_DONE;
+ }
+
ret = check_dev_is_matching_vf(event_dev);
if (ret != 0)
return NOTIFY_DONE;
--
2.34.1
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