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Date: Tue, 9 Jan 2007 17:59:01 -0500
From: Andy Gospodarek <andy@...yhouse.net>
To: fubar@...ibm.com, netdev@...r.kernel.org
Subject: [PATCH 1/1] bonding: eliminate RTNL assertion spew
These changes eliminate the messages indicating that the rtnetlink lock
isn't held when bonding tries to change the MAC address of an interface.
These calls generally come from timer-pops, but also from sysfs events
since neither hold the rtnl lock.
The spew generally looks something like this:
RTNL: assertion failed at net/core/fib_rules.c (391)
[<c028d12e>] fib_rules_event+0x3a/0xeb
[<c02da576>] notifier_call_chain+0x19/0x29
[<c0280ce6>] dev_set_mac_address+0x46/0x4b
[<f8a2a686>] alb_set_slave_mac_addr+0x5d/0x88 [bonding]
[<f8a2aa7e>] alb_swap_mac_addr+0x88/0x134 [bonding]
[<f8a25ed9>] bond_change_active_slave+0x1a1/0x2c5 [bonding]
[<f8a262e8>] bond_select_active_slave+0xa8/0xe1 [bonding]
[<f8a27ecb>] bond_mii_monitor+0x3af/0x3fd [bonding]
[<c0121896>] run_workqueue+0x85/0xc5
[<f8a27b1c>] bond_mii_monitor+0x0/0x3fd [bonding]
[<c0121d83>] worker_thread+0xe8/0x119
[<c0111179>] default_wake_function+0x0/0xc
[<c0121c9b>] worker_thread+0x0/0x119
[<c0124099>] kthread+0xad/0xd8
[<c0123fec>] kthread+0x0/0xd8
.....
This patch was mostly inspired from parts of some potential bonding
updates Jay Vosburgh <fubar@...ibm.com> and I discussed in December, so
he deserves most of the credit for the idea.
I've tested it on several systems and it works as I expect. Deadlocks
between the rtnl and global bond lock are avoided since we drop the
global bond lock before taking the rtnl lock.
Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
---
bond_alb.c | 16 +++++++++++++++-
bond_alb.h | 2 +-
bond_main.c | 32 +++++++++++++++++---------------
bond_sysfs.c | 8 ++++----
bonding.h | 7 +++++--
5 files changed, 42 insertions(+), 23 deletions(-)
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 3292316..150b787 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1557,13 +1557,14 @@ void bond_alb_handle_link_change(struct
* bond_alb_handle_active_change - assign new curr_active_slave
* @bond: our bonding struct
* @new_slave: new slave to assign
+ * @rtnl_locked: current rtnl lock status
*
* Set the bond->curr_active_slave to @new_slave and handle
* mac address swapping and promiscuity changes as needed.
*
* Caller must hold bond curr_slave_lock for write (or bond lock for write)
*/
-void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
+void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave, int rtnl_locked)
{
struct slave *swap_slave;
int i;
@@ -1585,6 +1586,7 @@ void bond_alb_handle_active_change(struc
return;
}
+
/* set the new curr_active_slave to the bonds mac address
* i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
*/
@@ -1600,6 +1602,12 @@ void bond_alb_handle_active_change(struc
}
}
+ /* need to hold rtnl_lock here, but unlock at least bond lock */
+ if (!rtnl_locked) {
+ write_unlock_bh(&bond->lock);
+ rtnl_lock();
+ }
+
/* curr_active_slave must be set before calling alb_swap_mac_addr */
if (swap_slave) {
/* swap mac address */
@@ -1611,6 +1619,12 @@ void bond_alb_handle_active_change(struc
/* fasten bond mac on new current slave */
alb_send_learning_packets(new_slave, bond->dev->dev_addr);
}
+
+ /* drop rtnl_lock, take back others */
+ if (!rtnl_locked) {
+ rtnl_unlock();
+ write_lock_bh(&bond->lock);
+ }
}
int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
diff --git a/drivers/net/bonding/bond_alb.h b/drivers/net/bonding/bond_alb.h
index 28f2a2f..af72dd8 100644
--- a/drivers/net/bonding/bond_alb.h
+++ b/drivers/net/bonding/bond_alb.h
@@ -123,7 +123,7 @@ void bond_alb_deinitialize(struct bondin
int bond_alb_init_slave(struct bonding *bond, struct slave *slave);
void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave);
void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link);
-void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave);
+void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave, int rtnl_locked);
int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
void bond_alb_monitor(struct bonding *bond);
int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr);
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 6482aed..0134dd0 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1029,6 +1029,7 @@ static struct slave *bond_find_best_slav
* change_active_interface - change the active slave into the specified one
* @bond: our bonding struct
* @new: the new slave to make the active one
+ * @rtnl_locked: current rtnl lock status
*
* Set the new slave to the bond's settings and unset them on the old
* curr_active_slave.
@@ -1040,7 +1041,7 @@ static struct slave *bond_find_best_slav
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
-void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
+void bond_change_active_slave(struct bonding *bond, struct slave *new_active, int rtnl_locked)
{
struct slave *old_active = bond->curr_active_slave;
@@ -1086,7 +1087,7 @@ void bond_change_active_slave(struct bon
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
- bond_alb_handle_active_change(bond, new_active);
+ bond_alb_handle_active_change(bond, new_active, rtnl_locked);
if (old_active)
bond_set_slave_inactive_flags(old_active);
if (new_active)
@@ -1110,6 +1111,7 @@ void bond_change_active_slave(struct bon
/**
* bond_select_active_slave - select a new active slave, if needed
* @bond: our bonding struct
+ * @rtnl_locked: indicates rtnl lock status
*
* This functions shoud be called when one of the following occurs:
* - The old curr_active_slave has been released or lost its link.
@@ -1118,14 +1120,14 @@ void bond_change_active_slave(struct bon
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
-void bond_select_active_slave(struct bonding *bond)
+void bond_select_active_slave(struct bonding *bond, int rtnl_locked)
{
struct slave *best_slave;
int rv;
best_slave = bond_find_best_slave(bond);
if (best_slave != bond->curr_active_slave) {
- bond_change_active_slave(bond, best_slave);
+ bond_change_active_slave(bond, best_slave, rtnl_locked);
rv = bond_set_carrier(bond);
if (!rv)
return;
@@ -1521,7 +1523,7 @@ int bond_enslave(struct net_device *bond
switch (bond->params.mode) {
case BOND_MODE_ACTIVEBACKUP:
bond_set_slave_inactive_flags(new_slave);
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond, BOND_RTNL_LOCKED);
break;
case BOND_MODE_8023AD:
/* in 802.3ad mode, the internal mechanism
@@ -1552,7 +1554,7 @@ int bond_enslave(struct net_device *bond
/* first slave or no active slave yet, and this link
* is OK, so make this interface the active one
*/
- bond_change_active_slave(bond, new_slave);
+ bond_change_active_slave(bond, new_slave, BOND_RTNL_LOCKED);
} else {
bond_set_slave_inactive_flags(new_slave);
}
@@ -1701,7 +1703,7 @@ int bond_release(struct net_device *bond
}
if (oldcurrent == slave) {
- bond_change_active_slave(bond, NULL);
+ bond_change_active_slave(bond, NULL,BOND_RTNL_LOCKED);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
@@ -1715,7 +1717,7 @@ int bond_release(struct net_device *bond
}
if (oldcurrent == slave)
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond,BOND_RTNL_LOCKED);
if (bond->slave_cnt == 0) {
bond_set_carrier(bond);
@@ -1812,7 +1814,7 @@ static int bond_release_all(struct net_d
bond->current_arp_slave = NULL;
bond->primary_slave = NULL;
- bond_change_active_slave(bond, NULL);
+ bond_change_active_slave(bond, NULL,BOND_RTNL_LOCKED);
while ((slave = bond->first_slave) != NULL) {
/* Inform AD package of unbinding of slave
@@ -1956,7 +1958,7 @@ static int bond_ioctl_change_active(stru
(old_active) &&
(new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
- bond_change_active_slave(bond, new_active);
+ bond_change_active_slave(bond, new_active, BOND_RTNL_LOCKED);
} else {
res = -EINVAL;
}
@@ -2240,7 +2242,7 @@ void bond_mii_monitor(struct net_device
if (do_failover) {
write_lock(&bond->curr_slave_lock);
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond,BOND_RTNL_UNLOCKED);
write_unlock(&bond->curr_slave_lock);
} else
@@ -2652,7 +2654,7 @@ void bond_loadbalance_arp_mon(struct net
if (do_failover) {
write_lock(&bond->curr_slave_lock);
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond,BOND_RTNL_UNLOCKED);
write_unlock(&bond->curr_slave_lock);
}
@@ -2715,7 +2717,7 @@ void bond_activebackup_arp_mon(struct ne
if ((!bond->curr_active_slave) &&
((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
- bond_change_active_slave(bond, slave);
+ bond_change_active_slave(bond, slave, BOND_RTNL_UNLOCKED);
bond->current_arp_slave = NULL;
} else if (bond->curr_active_slave != slave) {
/* this slave has just come up but we
@@ -2817,7 +2819,7 @@ void bond_activebackup_arp_mon(struct ne
write_lock(&bond->curr_slave_lock);
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond,BOND_RTNL_UNLOCKED);
slave = bond->curr_active_slave;
write_unlock(&bond->curr_slave_lock);
@@ -2840,7 +2842,7 @@ void bond_activebackup_arp_mon(struct ne
/* primary is up so switch to it */
write_lock(&bond->curr_slave_lock);
- bond_change_active_slave(bond, bond->primary_slave);
+ bond_change_active_slave(bond, bond->primary_slave, BOND_RTNL_UNLOCKED);
write_unlock(&bond->curr_slave_lock);
slave = bond->primary_slave;
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index ced9ed8..0633c92 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1042,7 +1042,7 @@ static ssize_t bonding_store_primary(str
": %s: Setting %s as primary slave.\n",
bond->dev->name, slave->dev->name);
bond->primary_slave = slave;
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond, BOND_RTNL_UNLOCKED);
goto out;
}
}
@@ -1054,7 +1054,7 @@ static ssize_t bonding_store_primary(str
": %s: Setting primary slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond, BOND_RTNL_UNLOCKED);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
@@ -1161,7 +1161,7 @@ static ssize_t bonding_store_active_slav
printk(KERN_INFO DRV_NAME
": %s: Setting %s as active slave.\n",
bond->dev->name, slave->dev->name);
- bond_change_active_slave(bond, new_active);
+ bond_change_active_slave(bond, new_active, BOND_RTNL_UNLOCKED);
}
else {
printk(KERN_INFO DRV_NAME
@@ -1182,7 +1182,7 @@ static ssize_t bonding_store_active_slav
": %s: Setting active slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
- bond_select_active_slave(bond);
+ bond_select_active_slave(bond, BOND_RTNL_UNLOCKED);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as active slave as it is not a slave.\n",
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index dc434fb..f7ec89d 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -29,6 +29,9 @@ #define DRV_DESCRIPTION "Ethernet Channe
#define BOND_MAX_ARP_TARGETS 16
+#define BOND_RTNL_LOCKED 1
+#define BOND_RTNL_UNLOCKED 0
+
#ifdef BONDING_DEBUG
#define dprintk(fmt, args...) \
printk(KERN_DEBUG \
@@ -306,8 +309,8 @@ void bond_activebackup_arp_mon(struct ne
void bond_set_mode_ops(struct bonding *bond, int mode);
int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl);
const char *bond_mode_name(int mode);
-void bond_select_active_slave(struct bonding *bond);
-void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
+void bond_select_active_slave(struct bonding *bond, int rtnl_locked);
+void bond_change_active_slave(struct bonding *bond, struct slave *new_active, int rtnl_locked);
void bond_register_arp(struct bonding *);
void bond_unregister_arp(struct bonding *);
-
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