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Message-Id: <1499378517-5042-1-git-send-email-xiyou.wangcong@gmail.com>
Date: Thu, 6 Jul 2017 15:01:57 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: hongjun.li@...nd.com, nicolas.dichtel@...nd.com,
Cong Wang <xiyou.wangcong@...il.com>,
Jay Vosburgh <j.vosburgh@...il.com>,
Veaceslav Falico <vfalico@...il.com>,
Andy Gospodarek <andy@...yhouse.net>
Subject: [Patch net] bonding: avoid NETDEV_CHANGEMTU event when unregistering slave
As Hongjun/Nicolas summarized in their original patch:
"
When a device changes from one netns to another, it's first unregistered,
then the netns reference is updated and the dev is registered in the new
netns. Thus, when a slave moves to another netns, it is first
unregistered. This triggers a NETDEV_UNREGISTER event which is caught by
the bonding driver. The driver calls bond_release(), which calls
dev_set_mtu() and thus triggers NETDEV_CHANGEMTU (the device is still in
the old netns).
"
This is a very special case, because the device is being unregistered
no one should still care about the NETDEV_CHANGEMTU event triggered
at this point, we can avoid broadcasting this event on this path,
and avoid touching inetdev_event()/addrconf_notify() path.
It requires to export __dev_set_mtu() to bonding driver.
Reported-by: Hongjun Li <hongjun.li@...nd.com>
Reported-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: Jay Vosburgh <j.vosburgh@...il.com>
Cc: Veaceslav Falico <vfalico@...il.com>
Cc: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
drivers/net/bonding/bond_main.c | 15 +++++++++------
include/linux/netdevice.h | 1 +
net/core/dev.c | 3 ++-
3 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 8ab6bdb..2971af1 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1820,7 +1820,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
*/
static int __bond_release_one(struct net_device *bond_dev,
struct net_device *slave_dev,
- bool all)
+ bool all, bool unregister)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *oldcurrent;
@@ -1965,7 +1965,10 @@ static int __bond_release_one(struct net_device *bond_dev,
dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
}
- dev_set_mtu(slave_dev, slave->original_mtu);
+ if (unregister)
+ __dev_set_mtu(slave_dev, slave->original_mtu);
+ else
+ dev_set_mtu(slave_dev, slave->original_mtu);
slave_dev->priv_flags &= ~IFF_BONDING;
@@ -1977,7 +1980,7 @@ static int __bond_release_one(struct net_device *bond_dev,
/* A wrapper used because of ndo_del_link */
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
{
- return __bond_release_one(bond_dev, slave_dev, false);
+ return __bond_release_one(bond_dev, slave_dev, false, false);
}
/* First release a slave and then destroy the bond if no more slaves are left.
@@ -1989,7 +1992,7 @@ static int bond_release_and_destroy(struct net_device *bond_dev,
struct bonding *bond = netdev_priv(bond_dev);
int ret;
- ret = bond_release(bond_dev, slave_dev);
+ ret = __bond_release_one(bond_dev, slave_dev, false, true);
if (ret == 0 && !bond_has_slaves(bond)) {
bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
netdev_info(bond_dev, "Destroying bond %s\n",
@@ -3060,7 +3063,7 @@ static int bond_slave_netdev_event(unsigned long event,
if (bond_dev->type != ARPHRD_ETHER)
bond_release_and_destroy(bond_dev, slave_dev);
else
- bond_release(bond_dev, slave_dev);
+ __bond_release_one(bond_dev, slave_dev, false, true);
break;
case NETDEV_UP:
case NETDEV_CHANGE:
@@ -4257,7 +4260,7 @@ static void bond_uninit(struct net_device *bond_dev)
/* Release the bonded slaves */
bond_for_each_slave(bond, slave, iter)
- __bond_release_one(bond_dev, slave->dev, true);
+ __bond_release_one(bond_dev, slave->dev, true, true);
netdev_info(bond_dev, "Released all slaves\n");
arr = rtnl_dereference(bond->slave_arr);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4ed952c..e4030db 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3287,6 +3287,7 @@ void __dev_notify_flags(struct net_device *, unsigned int old_flags,
int dev_change_name(struct net_device *, const char *);
int dev_set_alias(struct net_device *, const char *, size_t);
int dev_change_net_namespace(struct net_device *, struct net *, const char *);
+int __dev_set_mtu(struct net_device *, int);
int dev_set_mtu(struct net_device *, int);
void dev_set_group(struct net_device *, int);
int dev_set_mac_address(struct net_device *, struct sockaddr *);
diff --git a/net/core/dev.c b/net/core/dev.c
index 416137c..e567de8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6688,7 +6688,7 @@ int dev_change_flags(struct net_device *dev, unsigned int flags)
}
EXPORT_SYMBOL(dev_change_flags);
-static int __dev_set_mtu(struct net_device *dev, int new_mtu)
+int __dev_set_mtu(struct net_device *dev, int new_mtu)
{
const struct net_device_ops *ops = dev->netdev_ops;
@@ -6698,6 +6698,7 @@ static int __dev_set_mtu(struct net_device *dev, int new_mtu)
dev->mtu = new_mtu;
return 0;
}
+EXPORT_SYMBOL(__dev_set_mtu);
/**
* dev_set_mtu - Change maximum transfer unit
--
2.5.5
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