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Date: Tue, 19 Dec 2017 15:59:30 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Subject: [PATCH v2] hv_netvsc: automatically name slave VF network device
Rename the VF device to ethX_vf based on the ethX as the
synthetic device. This eliminates the need for delay on setup,
and the PCI (udev based) naming is not reproducible on Hyper-V
anyway. The name of the VF does not matter since all control
operations take place the primary device. It does make the
user experience better to associate the names.
Based on feedback from all.systems.go talk.
Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
---
v2 - also handle case where synthetic device gets renamed
and the case where rename causes clash with pre-existing device name
drivers/net/hyperv/hyperv_net.h | 1 -
drivers/net/hyperv/netvsc_drv.c | 84 +++++++++++++++++++++--------------------
net/core/dev.c | 1 +
3 files changed, 44 insertions(+), 42 deletions(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 0db3bd1ea06f..5013189123e6 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -762,7 +762,6 @@ struct net_device_context {
/* State to manage the associated VF interface. */
struct net_device __rcu *vf_netdev;
struct netvsc_vf_pcpu_stats __percpu *vf_stats;
- struct delayed_work vf_takeover;
/* 1: allocated, serial number is valid. 0: not allocated */
u32 vf_alloc;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c5584c2d440e..420e11fd3e85 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -49,7 +49,6 @@
#define RING_SIZE_MIN 64
#define LINKCHANGE_INT (2 * HZ)
-#define VF_TAKEOVER_INT (HZ / 10)
static unsigned int ring_size __ro_after_init = 128;
module_param(ring_size, uint, S_IRUGO);
@@ -1757,10 +1756,19 @@ static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
return RX_HANDLER_ANOTHER;
}
+/* set the name of VF device based on upper device name */
+static int netvsc_vf_rename(const struct net_device *ndev,
+ struct net_device *vf_netdev)
+{
+ char vf_name[IFNAMSIZ];
+
+ snprintf(vf_name, IFNAMSIZ, "%s_vf", ndev->name);
+ return dev_change_name(vf_netdev, vf_name);
+}
+
static int netvsc_vf_join(struct net_device *vf_netdev,
struct net_device *ndev)
{
- struct net_device_context *ndev_ctx = netdev_priv(ndev);
int ret;
ret = netdev_rx_handler_register(vf_netdev,
@@ -1783,23 +1791,12 @@ static int netvsc_vf_join(struct net_device *vf_netdev,
/* set slave flag before open to prevent IPv6 addrconf */
vf_netdev->flags |= IFF_SLAVE;
- schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
-
call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
- netdev_info(vf_netdev, "joined to %s\n", ndev->name);
- return 0;
-
-upper_link_failed:
- netdev_rx_handler_unregister(vf_netdev);
-rx_handler_failed:
- return ret;
-}
-
-static void __netvsc_vf_setup(struct net_device *ndev,
- struct net_device *vf_netdev)
-{
- int ret;
+ ret = netvsc_vf_rename(ndev, vf_netdev);
+ if (ret != 0)
+ netdev_warn(vf_netdev,
+ "can not rename device: (%d)\n", ret);
/* Align MTU of VF with master */
ret = dev_set_mtu(vf_netdev, ndev->mtu);
@@ -1807,34 +1804,21 @@ static void __netvsc_vf_setup(struct net_device *ndev,
netdev_warn(vf_netdev,
"unable to change mtu to %u\n", ndev->mtu);
+ /* If upper device is already up, bring up slave */
if (netif_running(ndev)) {
ret = dev_open(vf_netdev);
if (ret)
netdev_warn(vf_netdev,
"unable to open: %d\n", ret);
}
-}
-/* Setup VF as slave of the synthetic device.
- * Runs in workqueue to avoid recursion in netlink callbacks.
- */
-static void netvsc_vf_setup(struct work_struct *w)
-{
- struct net_device_context *ndev_ctx
- = container_of(w, struct net_device_context, vf_takeover.work);
- struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
- struct net_device *vf_netdev;
-
- if (!rtnl_trylock()) {
- schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
- return;
- }
-
- vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
- if (vf_netdev)
- __netvsc_vf_setup(ndev, vf_netdev);
+ netdev_info(vf_netdev, "joined to %s\n", ndev->name);
+ return 0;
- rtnl_unlock();
+ upper_link_failed:
+ netdev_rx_handler_unregister(vf_netdev);
+ rx_handler_failed:
+ return ret;
}
static int netvsc_register_vf(struct net_device *vf_netdev)
@@ -1894,6 +1878,22 @@ static int netvsc_vf_changed(struct net_device *vf_netdev)
return NOTIFY_OK;
}
+/* Synthetic device name changed, rename VF */
+static int netvsc_name_change(struct net_device *ndev)
+{
+ struct net_device_context *ndev_ctx = netdev_priv(ndev);
+ struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+ int err;
+
+ if (vf_netdev) {
+ err = netvsc_vf_rename(ndev, vf_netdev);
+
+ return err ? notifier_from_errno(err) : NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
static int netvsc_unregister_vf(struct net_device *vf_netdev)
{
struct net_device *ndev;
@@ -1904,7 +1904,6 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev)
return NOTIFY_DONE;
net_device_ctx = netdev_priv(ndev);
- cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
@@ -1947,7 +1946,6 @@ static int netvsc_probe(struct hv_device *dev,
spin_lock_init(&net_device_ctx->lock);
INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
- INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
net_device_ctx->vf_stats
= netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
@@ -2085,9 +2083,13 @@ static int netvsc_netdev_event(struct notifier_block *this,
{
struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
- /* Skip our own events */
- if (event_dev->netdev_ops == &device_ops)
+ /* Events on synthetic device? */
+ if (event_dev->netdev_ops == &device_ops) {
+ if (event == NETDEV_CHANGENAME)
+ return netvsc_name_change(event_dev);
+
return NOTIFY_DONE;
+ }
/* Avoid non-Ethernet type devices */
if (event_dev->type != ARPHRD_ETHER)
diff --git a/net/core/dev.c b/net/core/dev.c
index c7db39926769..f51358a90efa 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1238,6 +1238,7 @@ int dev_change_name(struct net_device *dev, const char *newname)
return err;
}
+EXPORT_SYMBOL(dev_change_name);
/**
* dev_set_alias - change ifalias of a device
--
2.11.0
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