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Date: Wed, 02 Dec 2009 16:10:33 -0500
From: Patrick Mullaney <pmullaney@...ell.com>
To: alacrityvm-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 2/2] venet: Fixes for shutdown and re-registration of venet
devices.
Fixed a problem with simple re-registration of the venet netdevice. The
netdev core infrastructure appears to have a problem with re-registering
a previously registered netdevice(reg_state and kobj.state_initialized
need to be reset to their default values). I now do this prior to calling
register_netdev but this probably should be moved to net/core. Fixed an
issue with the removal of the lower level device of a venet-macvlan. I'm
planning a cleaner solution in the future. Fixed a lock issue with
venet-macvlan stop method that was causing a hang.
Signed-off-by: Patrick Mullaney <pmullaney@...ell.com>
---
kernel/vbus/devices/venet/device.c | 11 +++++-
kernel/vbus/devices/venet/macvlan.c | 55 +++++++++++++++++++++++++------
kernel/vbus/devices/venet/venetdevice.h | 7 +++-
3 files changed, 58 insertions(+), 15 deletions(-)
diff --git a/kernel/vbus/devices/venet/device.c b/kernel/vbus/devices/venet/device.c
index 01d6f1c..b4cf397 100644
--- a/kernel/vbus/devices/venet/device.c
+++ b/kernel/vbus/devices/venet/device.c
@@ -2300,7 +2300,7 @@ client_mac_show(struct vbus_device *dev, struct vbus_device_attribute *attr,
struct vbus_device_attribute attr_cmac =
__ATTR(client_mac, S_IRUGO | S_IWUSR, client_mac_show, cmac_store);
-static ssize_t
+ssize_t
enabled_show(struct vbus_device *dev, struct vbus_device_attribute *attr,
char *buf)
{
@@ -2309,7 +2309,7 @@ enabled_show(struct vbus_device *dev, struct vbus_device_attribute *attr,
return snprintf(buf, PAGE_SIZE, "%d\n", priv->netif.enabled);
}
-static ssize_t
+ssize_t
enabled_store(struct vbus_device *dev, struct vbus_device_attribute *attr,
const char *buf, size_t count)
{
@@ -2323,8 +2323,13 @@ enabled_store(struct vbus_device *dev, struct vbus_device_attribute *attr,
if (enabled != 0 && enabled != 1)
return -EINVAL;
- if (enabled && !priv->netif.enabled)
+ if (enabled && !priv->netif.enabled) {
+ /* need to un-initialize certain fields of the
+ net_device so that it may be re-registered */
+ priv->netif.dev->reg_state = NETREG_UNINITIALIZED;
+ priv->netif.dev->dev.kobj.state_initialized = 0;
ret = register_netdev(priv->netif.dev);
+ }
if (!enabled && priv->netif.enabled)
venetdev_netdev_unregister(priv);
diff --git a/kernel/vbus/devices/venet/macvlan.c b/kernel/vbus/devices/venet/macvlan.c
index 432ff5d..60479a6 100644
--- a/kernel/vbus/devices/venet/macvlan.c
+++ b/kernel/vbus/devices/venet/macvlan.c
@@ -137,7 +137,7 @@ venetmacv_vlink_up(struct venetdev *vdev)
ret = macv->macvlan_netdev_ops->ndo_open(vdev->netif.dev);
rtnl_unlock();
if (ret)
- printk(KERN_ERR "macvlanopen failed %d!\n", ret);
+ printk(KERN_ERR "macvlan_open failed %d!\n", ret);
}
}
@@ -320,8 +320,10 @@ venetmacv_device_release(struct vbus_device *dev)
{
struct venetmacv *macv = vbusdev_to_macv(dev);
- if (macv->mdev.lowerdev)
+ if (macv->mdev.lowerdev) {
dev_put(macv->mdev.lowerdev);
+ macv->mdev.lowerdev = NULL;
+ }
venetdev_netdev_unregister(&macv->dev);
free_netdev(macv->mdev.dev);
@@ -397,12 +399,31 @@ clientmac_store(struct vbus_device *dev, struct vbus_device_attribute *attr,
return ret;
}
-struct vbus_device_attribute attr_clientmac =
+static struct vbus_device_attribute attr_clientmac =
__ATTR(client_mac, S_IRUGO | S_IWUSR, client_mac_show, clientmac_store);
+
+static ssize_t
+macv_enabled_store(struct vbus_device *dev, struct vbus_device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct venetmacv *macv = vbusdev_to_macv(dev);
+ int ret;
+
+ if (!macv->mdev.lowerdev)
+ return -ENXIO;
+
+ ret = attr_enabled.store(dev, attr, buf, count);
+
+ return ret;
+}
+
+static struct vbus_device_attribute attr_macv_enabled =
+ __ATTR(enabled, S_IRUGO | S_IWUSR, enabled_show, macv_enabled_store);
+
static struct attribute *attrs[] = {
&attr_clientmac.attr,
- &attr_enabled.attr,
+ &attr_macv_enabled.attr,
&attr_burstthresh.attr,
&attr_txmitigation.attr,
&attr_ifname.attr,
@@ -423,9 +444,7 @@ venetmacv_netdev_open(struct net_device *dev)
venetdev_open(&priv->dev);
if (priv->dev.vbus.link) {
- rtnl_lock();
ret = priv->macvlan_netdev_ops->ndo_open(priv->mdev.dev);
- rtnl_unlock();
}
return ret;
@@ -443,15 +462,26 @@ venetmacv_netdev_stop(struct net_device *dev)
venetdev_stop(&priv->dev);
- if (priv->dev.vbus.link && needs_stop) {
- rtnl_lock();
+ if (priv->dev.vbus.link && needs_stop)
ret = priv->macvlan_netdev_ops->ndo_stop(dev);
- rtnl_unlock();
- }
return ret;
}
+static void
+venetmacv_netdev_uninit(struct net_device *dev)
+{
+ struct venetmacv *macv = netdev_priv(dev);
+
+ if (macv->mdev.lowerdev) {
+ dev_put(macv->mdev.lowerdev);
+ macv->mdev.lowerdev = NULL;
+ memset(macv->ll_ifname, '\0', IFNAMSIZ);
+ }
+
+ macv->dev.netif.enabled = 0;
+}
+
/*
* out routine for macvlan
*/
@@ -527,9 +557,9 @@ static struct net_device_ops venetmacv_netdev_ops = {
.ndo_start_xmit = venetmacv_netdev_tx,
.ndo_do_ioctl = venetdev_netdev_ioctl,
.ndo_get_stats = venetmacv_netdev_stats,
+ .ndo_uninit = venetmacv_netdev_uninit,
};
-
/*
* This is called whenever the admin instantiates our devclass via
* "mkdir /config/vbus/devices/$(inst)/venet-tap"
@@ -545,6 +575,9 @@ venetmacv_device_create(struct vbus_devclass *dc,
dev = alloc_netdev(sizeof(struct venetmacv), "macvenet%d",
macvlan_setup);
+
+ dev->destructor = NULL;
+
if (!dev)
return -ENOMEM;
diff --git a/kernel/vbus/devices/venet/venetdevice.h b/kernel/vbus/devices/venet/venetdevice.h
index 1a74723..edee570 100644
--- a/kernel/vbus/devices/venet/venetdevice.h
+++ b/kernel/vbus/devices/venet/venetdevice.h
@@ -150,7 +150,7 @@ struct net_device_stats *venetdev_get_stats(struct venetdev *dev);
static inline void venetdev_netdev_unregister(struct venetdev *priv)
{
if (priv->netif.enabled) {
- venetdev_netdev_stop(priv->netif.dev);
+ venetdev_stop(priv);
unregister_netdev(priv->netif.dev);
}
}
@@ -173,6 +173,11 @@ extern struct vbus_device_attribute attr_ifname;
extern struct vbus_device_attribute attr_txmitigation;
extern struct vbus_device_attribute attr_zcthresh;
+ssize_t enabled_store(struct vbus_device *dev,
+ struct vbus_device_attribute *attr,
+ const char *buf, size_t count);
+ssize_t enabled_show(struct vbus_device *dev,
+ struct vbus_device_attribute *attr, char *buf);
ssize_t cmac_store(struct vbus_device *dev,
struct vbus_device_attribute *attr,
const char *buf, size_t count);
--
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