4.19-stable review patch. If anyone has any objections, please let me know.
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From: Haiyang Zhang haiyangz@microsoft.com
commit 4c262801ea60c518b5bebc22a09f5b78b3147da2 upstream.
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@vger.kernel.org Fixes: c0a41b887ce6 ("hv_netvsc: move VF to same namespace as netvsc device") Suggested-by: Stephen Hemminger stephen@networkplumber.org Signed-off-by: Haiyang Zhang haiyangz@microsoft.com Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/1729275922-17595-1-git-send-email-haiyangz@microsof... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/hyperv/netvsc_drv.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
--- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2526,6 +2526,31 @@ 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 @@ -2538,6 +2563,11 @@ static int netvsc_netdev_event(struct no 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;