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Date: Fri, 20 Feb 2009 19:31:29 -0500
From: Brian Haley <brian.haley@...com>
To: David Miller <davem@...emloft.net>
CC: Andrey Borzenkov <arvidjaar@...l.ru>,
Vladislav Yasevich <vladislav.yasevich@...com>,
Chuck Lever <chuck.lever@...cle.com>,
Theodore Tso <tytso@....edu>, Valdis.Kletnieks@...edu,
"Rafael J. Wysocki" <rjw@...k.pl>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
bonding-devel@...ts.sourceforge.net,
"J.A. Magallón"
<jamagallon@....com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH] bonding: move IPv6 support into a separate kernel module
[Possible fix for bonding IPv6 regression reported by Andrey Borzenkov,
tried to keep all Cc's]
This patch moves the IPv6 bonding code into a separate kernel module
called bonding_ipv6 if either bonding or IPv6 are built as modules.
If both are built into the kernel then this is as well. Bonding_ipv6.ko
registers an "send_unsol_na" function pointer for the unsolicited
advertisement function to be called on a failover - the default action
is to do nothing. The notifier callbacks are now registered in this
module and not in the base bonding module.
Signed-off-by: Brian Haley <brian.haley@...com>
---
Documentation/networking/bonding.txt | 3 ++
drivers/net/bonding/Makefile | 5 ++-
drivers/net/bonding/bond_ipv6.c | 13 +++++++-
drivers/net/bonding/bond_main.c | 52
++++++++++++++++++++++++++++++---
drivers/net/bonding/bonding.h | 9 +++--
5 files changed, 69 insertions(+), 13 deletions(-)
diff --git a/Documentation/networking/bonding.txt
b/Documentation/networking/bonding.txt
index 5ede747..c8b1c1f 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -603,6 +603,9 @@ num_unsol_na
affects only the active-backup mode. This option was added for
bonding version 3.4.0.
+ In order to get this functionality, you will need to load the
+ Bonding IPv6 module with 'modprobe bonding_ipv6'.
+
primary
A string (eth0, eth2, etc) specifying which slave is the
diff --git a/drivers/net/bonding/Makefile b/drivers/net/bonding/Makefile
index 6f9c6fa..d4f6338 100644
--- a/drivers/net/bonding/Makefile
+++ b/drivers/net/bonding/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_BONDING) += bonding.o
bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o
-ipv6-$(subst m,y,$(CONFIG_IPV6)) += bond_ipv6.o
-bonding-objs += $(ipv6-y)
+# build bonding_ipv6 as module whenever either IPv6 or Bonding is a module
+obj-$(subst y,$(CONFIG_BONDING),$(CONFIG_IPV6)) += bonding_ipv6.o
+bonding_ipv6-y := bond_ipv6.o
diff --git a/drivers/net/bonding/bond_ipv6.c
b/drivers/net/bonding/bond_ipv6.c
index 0d73bf5..2f10514 100644
--- a/drivers/net/bonding/bond_ipv6.c
+++ b/drivers/net/bonding/bond_ipv6.c
@@ -20,6 +20,9 @@
*
*/
+#include <linux/module.h>
+#include <linux/init.h>
+
#include <linux/types.h>
#include <linux/if_vlan.h>
#include <net/ipv6.h>
@@ -204,13 +207,19 @@ static struct notifier_block
bond_inet6addr_notifier = {
.notifier_call = bond_inet6addr_event,
};
-void bond_register_ipv6_notifier(void)
+static int __init bonding_ipv6_init(void)
{
+ bond_register_ipv6_na(bond_send_unsolicited_na);
register_inet6addr_notifier(&bond_inet6addr_notifier);
+ return 0;
}
-void bond_unregister_ipv6_notifier(void)
+static void __exit bonding_ipv6_exit(void)
{
unregister_inet6addr_notifier(&bond_inet6addr_notifier);
+ bond_unregister_ipv6_na();
}
+module_init(bonding_ipv6_init)
+module_exit(bonding_ipv6_exit)
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/bonding/bond_main.c
b/drivers/net/bonding/bond_main.c
index 2c96b93..ff61add 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -149,6 +149,12 @@ static const char * const version =
DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
LIST_HEAD(bond_dev_list);
+EXPORT_SYMBOL(bond_dev_list);
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static DEFINE_SPINLOCK(bond_v6_na_lock);
+#endif
+static void (*bond_send_unsol_na)(struct bonding *bond);
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
@@ -1201,6 +1207,8 @@ void bond_change_active_slave(struct bonding
*bond, struct slave *new_active)
}
if (new_active) {
+ void (*send_unsol_na)(struct bonding *bond);
+
bond_set_slave_active_flags(new_active);
if (bond->params.fail_over_mac)
@@ -1211,7 +1219,11 @@ void bond_change_active_slave(struct bonding
*bond, struct slave *new_active)
bond_send_gratuitous_arp(bond);
bond->send_unsol_na = bond->params.num_unsol_na;
- bond_send_unsolicited_na(bond);
+ rcu_read_lock();
+ send_unsol_na = rcu_dereference(bond_send_unsol_na);
+ if (send_unsol_na)
+ send_unsol_na(bond);
+ rcu_read_unlock();
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
@@ -2464,8 +2476,14 @@ void bond_mii_monitor(struct work_struct *work)
}
if (bond->send_unsol_na) {
+ void (*send_unsol_na)(struct bonding *bond);
+
read_lock(&bond->curr_slave_lock);
- bond_send_unsolicited_na(bond);
+ rcu_read_lock();
+ send_unsol_na = rcu_dereference(bond_send_unsol_na);
+ if (send_unsol_na)
+ send_unsol_na(bond);
+ rcu_read_unlock();
read_unlock(&bond->curr_slave_lock);
}
@@ -3165,8 +3183,14 @@ void bond_activebackup_arp_mon(struct work_struct
*work)
}
if (bond->send_unsol_na) {
+ void (*send_unsol_na)(struct bonding *bond);
+
read_lock(&bond->curr_slave_lock);
- bond_send_unsolicited_na(bond);
+ rcu_read_lock();
+ send_unsol_na = rcu_dereference(bond_send_unsol_na);
+ if (send_unsol_na)
+ send_unsol_na(bond);
+ rcu_read_unlock();
read_unlock(&bond->curr_slave_lock);
}
@@ -5203,6 +5227,26 @@ out_rtnl:
return res;
}
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+void bond_register_ipv6_na(void (*send_unsol_na) (struct bonding *bond))
+{
+ spin_lock_bh(&bond_v6_na_lock);
+ rcu_assign_pointer(bond_send_unsol_na, send_unsol_na);
+ spin_unlock_bh(&bond_v6_na_lock);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(bond_register_ipv6_na);
+
+void bond_unregister_ipv6_na(void)
+{
+ spin_lock_bh(&bond_v6_na_lock);
+ rcu_assign_pointer(bond_send_unsol_na, NULL);
+ spin_unlock_bh(&bond_v6_na_lock);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL(bond_unregister_ipv6_na);
+#endif
+
static int __init bonding_init(void)
{
int i;
@@ -5234,7 +5278,6 @@ static int __init bonding_init(void)
register_netdevice_notifier(&bond_netdev_notifier);
register_inetaddr_notifier(&bond_inetaddr_notifier);
- bond_register_ipv6_notifier();
goto out;
err:
@@ -5257,7 +5300,6 @@ static void __exit bonding_exit(void)
{
unregister_netdevice_notifier(&bond_netdev_notifier);
unregister_inetaddr_notifier(&bond_inetaddr_notifier);
- bond_unregister_ipv6_notifier();
bond_destroy_sysfs();
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index ca849d2..9e5e092 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -23,15 +23,13 @@
#include "bond_3ad.h"
#include "bond_alb.h"
-#define DRV_VERSION "3.5.0"
-#define DRV_RELDATE "November 4, 2008"
+#define DRV_VERSION "3.6.0"
+#define DRV_RELDATE "February 20, 2009"
#define DRV_NAME "bonding"
#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
#define BOND_MAX_ARP_TARGETS 16
-extern struct list_head bond_dev_list;
-
#define IS_UP(dev) \
((((dev)->flags & IFF_UP) == IFF_UP) && \
netif_running(dev) && \
@@ -360,6 +358,9 @@ extern struct rw_semaphore bonding_rwsem;
void bond_send_unsolicited_na(struct bonding *bond);
void bond_register_ipv6_notifier(void);
void bond_unregister_ipv6_notifier(void);
+
+void bond_register_ipv6_na(void (*send_unsol_na) (struct bonding *bond));
+void bond_unregister_ipv6_na(void);
#else
static inline void bond_send_unsolicited_na(struct bonding *bond)
{
--
1.5.4.3
--
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