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linux/drivers/net/bonding/bond_sysfs.c
Moni Shoua db018a5f49 bonding: Don't destroy bonding master when removing slave via sysfs 
It is wrong to destroy a bonding master from a context that uses the sysfs
of that bond. When last IPoIB slave is unenslaved from by writing to a
sysfs file (for bond0 this would be /sys/class/net/bond0/bonding/slaves)
the driver tries to destroy the bond. This is wrong and can lead to a
lockup or a crash.  This fix lets the bonding master stay and relies on
the user to destroy the bonding master if necessary (i.e. before module
ib_ipoib is unloaded)

This patch affects only bonds of IPoIB slaves. Ethernet slaves stay
unaffected.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2008-08-07 03:59:56 -04:00

1510 lines
41 KiB
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/*
* Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/rtnetlink.h>
#include <net/net_namespace.h>
/* #define BONDING_DEBUG 1 */
#include "bonding.h"
#define to_dev(obj) container_of(obj,struct device,kobj)
#define to_bond(cd) ((struct bonding *)(to_net_dev(cd)->priv))
/*---------------------------- Declarations -------------------------------*/
extern struct list_head bond_dev_list;
extern struct bond_params bonding_defaults;
extern struct bond_parm_tbl bond_mode_tbl[];
extern struct bond_parm_tbl bond_lacp_tbl[];
extern struct bond_parm_tbl xmit_hashtype_tbl[];
extern struct bond_parm_tbl arp_validate_tbl[];
extern struct bond_parm_tbl fail_over_mac_tbl[];
static int expected_refcount = -1;
/*--------------------------- Data Structures -----------------------------*/
/* Bonding sysfs lock. Why can't we just use the subsystem lock?
* Because kobject_register tries to acquire the subsystem lock. If
* we already hold the lock (which we would if the user was creating
* a new bond through the sysfs interface), we deadlock.
* This lock is only needed when deleting a bond - we need to make sure
* that we don't collide with an ongoing ioctl.
*/
struct rw_semaphore bonding_rwsem;
/*------------------------------ Functions --------------------------------*/
/*
* "show" function for the bond_masters attribute.
* The class parameter is ignored.
*/
static ssize_t bonding_show_bonds(struct class *cls, char *buf)
{
int res = 0;
struct bonding *bond;
down_read(&(bonding_rwsem));
list_for_each_entry(bond, &bond_dev_list, bond_list) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
res += sprintf(buf + res, "++more++ ");
break;
}
res += sprintf(buf + res, "%s ", bond->dev->name);
}
if (res)
buf[res-1] = '\n'; /* eat the leftover space */
up_read(&(bonding_rwsem));
return res;
}
/*
* "store" function for the bond_masters attribute. This is what
* creates and deletes entire bonds.
*
* The class parameter is ignored.
*
*/
static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
{
char command[IFNAMSIZ + 1] = {0, };
char *ifname;
int rv, res = count;
struct bonding *bond;
sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
if ((strlen(command) <= 1) ||
!dev_valid_name(ifname))
goto err_no_cmd;
if (command[0] == '+') {
printk(KERN_INFO DRV_NAME
": %s is being created...\n", ifname);
rv = bond_create(ifname, &bonding_defaults);
if (rv) {
printk(KERN_INFO DRV_NAME ": Bond creation failed.\n");
res = rv;
}
goto out;
}
if (command[0] == '-') {
rtnl_lock();
down_write(&bonding_rwsem);
list_for_each_entry(bond, &bond_dev_list, bond_list)
if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
/* check the ref count on the bond's kobject.
* If it's > expected, then there's a file open,
* and we have to fail.
*/
if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
> expected_refcount){
printk(KERN_INFO DRV_NAME
": Unable remove bond %s due to open references.\n",
ifname);
res = -EPERM;
goto out_unlock;
}
printk(KERN_INFO DRV_NAME
": %s is being deleted...\n",
bond->dev->name);
bond_destroy(bond);
goto out_unlock;
}
printk(KERN_ERR DRV_NAME
": unable to delete non-existent bond %s\n", ifname);
res = -ENODEV;
goto out_unlock;
}
err_no_cmd:
printk(KERN_ERR DRV_NAME
": no command found in bonding_masters. Use +ifname or -ifname.\n");
return -EPERM;
out_unlock:
up_write(&bonding_rwsem);
rtnl_unlock();
/* Always return either count or an error. If you return 0, you'll
* get called forever, which is bad.
*/
out:
return res;
}
/* class attribute for bond_masters file. This ends up in /sys/class/net */
static CLASS_ATTR(bonding_masters, S_IWUSR | S_IRUGO,
bonding_show_bonds, bonding_store_bonds);
int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
{
char linkname[IFNAMSIZ+7];
int ret = 0;
/* first, create a link from the slave back to the master */
ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
"master");
if (ret)
return ret;
/* next, create a link from the master to the slave */
sprintf(linkname,"slave_%s",slave->name);
ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
linkname);
return ret;
}
void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
{
char linkname[IFNAMSIZ+7];
sysfs_remove_link(&(slave->dev.kobj), "master");
sprintf(linkname,"slave_%s",slave->name);
sysfs_remove_link(&(master->dev.kobj), linkname);
}
/*
* Show the slaves in the current bond.
*/
static ssize_t bonding_show_slaves(struct device *d,
struct device_attribute *attr, char *buf)
{
struct slave *slave;
int i, res = 0;
struct bonding *bond = to_bond(d);
read_lock(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
res += sprintf(buf + res, "++more++ ");
break;
}
res += sprintf(buf + res, "%s ", slave->dev->name);
}
read_unlock(&bond->lock);
if (res)
buf[res-1] = '\n'; /* eat the leftover space */
return res;
}
/*
* Set the slaves in the current bond. The bond interface must be
* up for this to succeed.
* This function is largely the same flow as bonding_update_bonds().
*/
static ssize_t bonding_store_slaves(struct device *d,
struct device_attribute *attr,
const char *buffer, size_t count)
{
char command[IFNAMSIZ + 1] = { 0, };
char *ifname;
int i, res, found, ret = count;
u32 original_mtu;
struct slave *slave;
struct net_device *dev = NULL;
struct bonding *bond = to_bond(d);
/* Quick sanity check -- is the bond interface up? */
if (!(bond->dev->flags & IFF_UP)) {
printk(KERN_WARNING DRV_NAME
": %s: doing slave updates when interface is down.\n",
bond->dev->name);
}
/* Note: We can't hold bond->lock here, as bond_create grabs it. */
rtnl_lock();
down_write(&(bonding_rwsem));
sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
if ((strlen(command) <= 1) ||
!dev_valid_name(ifname))
goto err_no_cmd;
if (command[0] == '+') {
/* Got a slave name in ifname. Is it already in the list? */
found = 0;
read_lock(&bond->lock);
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
printk(KERN_ERR DRV_NAME
": %s: Interface %s is already enslaved!\n",
bond->dev->name, ifname);
ret = -EPERM;
read_unlock(&bond->lock);
goto out;
}
read_unlock(&bond->lock);
printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
bond->dev->name, ifname);
dev = dev_get_by_name(&init_net, ifname);
if (!dev) {
printk(KERN_INFO DRV_NAME
": %s: Interface %s does not exist!\n",
bond->dev->name, ifname);
ret = -EPERM;
goto out;
}
else
dev_put(dev);
if (dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": %s: Error: Unable to enslave %s "
"because it is already up.\n",
bond->dev->name, dev->name);
ret = -EPERM;
goto out;
}
/* If this is the first slave, then we need to set
the master's hardware address to be the same as the
slave's. */
if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
memcpy(bond->dev->dev_addr, dev->dev_addr,
dev->addr_len);
}
/* Set the slave's MTU to match the bond */
original_mtu = dev->mtu;
if (dev->mtu != bond->dev->mtu) {
if (dev->change_mtu) {
res = dev->change_mtu(dev,
bond->dev->mtu);
if (res) {
ret = res;
goto out;
}
} else {
dev->mtu = bond->dev->mtu;
}
}
res = bond_enslave(bond->dev, dev);
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
slave->original_mtu = original_mtu;
if (res) {
ret = res;
}
goto out;
}
if (command[0] == '-') {
dev = NULL;
original_mtu = 0;
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
dev = slave->dev;
original_mtu = slave->original_mtu;
break;
}
if (dev) {
printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
bond->dev->name, dev->name);
res = bond_release(bond->dev, dev);
if (res) {
ret = res;
goto out;
}
/* set the slave MTU to the default */
if (dev->change_mtu) {
dev->change_mtu(dev, original_mtu);
} else {
dev->mtu = original_mtu;
}
}
else {
printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
ifname, bond->dev->name);
ret = -ENODEV;
}
goto out;
}
err_no_cmd:
printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
ret = -EPERM;
out:
up_write(&(bonding_rwsem));
rtnl_unlock();
return ret;
}
static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
/*
* Show and set the bonding mode. The bond interface must be down to
* change the mode.
*/
static ssize_t bonding_show_mode(struct device *d,
struct device_attribute *attr, char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
bond_mode_tbl[bond->params.mode].modename,
bond->params.mode);
}
static ssize_t bonding_store_mode(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": unable to update mode of %s because interface is up.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm(buf, bond_mode_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid mode value %.*s.\n",
bond->dev->name,
(int)strlen(buf) - 1, buf);
ret = -EINVAL;
goto out;
} else {
if (bond->params.mode == BOND_MODE_8023AD)
bond_unset_master_3ad_flags(bond);
if (bond->params.mode == BOND_MODE_ALB)
bond_unset_master_alb_flags(bond);
bond->params.mode = new_value;
bond_set_mode_ops(bond, bond->params.mode);
printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
}
out:
return ret;
}
static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
/*
* Show and set the bonding transmit hash method. The bond interface must be down to
* change the xmit hash policy.
*/
static ssize_t bonding_show_xmit_hash(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
xmit_hashtype_tbl[bond->params.xmit_policy].modename,
bond->params.xmit_policy);
}
static ssize_t bonding_store_xmit_hash(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
"%s: Interface is up. Unable to update xmit policy.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid xmit hash policy value %.*s.\n",
bond->dev->name,
(int)strlen(buf) - 1, buf);
ret = -EINVAL;
goto out;
} else {
bond->params.xmit_policy = new_value;
bond_set_mode_ops(bond, bond->params.mode);
printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
}
out:
return ret;
}
static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
/*
* Show and set arp_validate.
*/
static ssize_t bonding_show_arp_validate(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
arp_validate_tbl[bond->params.arp_validate].modename,
bond->params.arp_validate);
}
static ssize_t bonding_store_arp_validate(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value;
struct bonding *bond = to_bond(d);
new_value = bond_parse_parm(buf, arp_validate_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid arp_validate value %s\n",
bond->dev->name, buf);
return -EINVAL;
}
if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
printk(KERN_ERR DRV_NAME
": %s: arp_validate only supported in active-backup mode.\n",
bond->dev->name);
return -EINVAL;
}
printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
bond->dev->name, arp_validate_tbl[new_value].modename,
new_value);
if (!bond->params.arp_validate && new_value) {
bond_register_arp(bond);
} else if (bond->params.arp_validate && !new_value) {
bond_unregister_arp(bond);
}
bond->params.arp_validate = new_value;
return count;
}
static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
/*
* Show and store fail_over_mac. User only allowed to change the
* value when there are no slaves.
*/
static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
fail_over_mac_tbl[bond->params.fail_over_mac].modename,
bond->params.fail_over_mac);
}
static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
{
int new_value;
struct bonding *bond = to_bond(d);
if (bond->slave_cnt != 0) {
printk(KERN_ERR DRV_NAME
": %s: Can't alter fail_over_mac with slaves in bond.\n",
bond->dev->name);
return -EPERM;
}
new_value = bond_parse_parm(buf, fail_over_mac_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid fail_over_mac value %s.\n",
bond->dev->name, buf);
return -EINVAL;
}
bond->params.fail_over_mac = new_value;
printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %s (%d).\n",
bond->dev->name, fail_over_mac_tbl[new_value].modename,
new_value);
return count;
}
static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
/*
* Show and set the arp timer interval. There are two tricky bits
* here. First, if ARP monitoring is activated, then we must disable
* MII monitoring. Second, if the ARP timer isn't running, we must
* start it.
*/
static ssize_t bonding_show_arp_interval(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.arp_interval);
}
static ssize_t bonding_store_arp_interval(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no arp_interval value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
bond->dev->name, new_value, INT_MAX);
ret = -EINVAL;
goto out;
}
printk(KERN_INFO DRV_NAME
": %s: Setting ARP monitoring interval to %d.\n",
bond->dev->name, new_value);
bond->params.arp_interval = new_value;
if (bond->params.miimon) {
printk(KERN_INFO DRV_NAME
": %s: ARP monitoring cannot be used with MII monitoring. "
"%s Disabling MII monitoring.\n",
bond->dev->name, bond->dev->name);
bond->params.miimon = 0;
if (delayed_work_pending(&bond->mii_work)) {
cancel_delayed_work(&bond->mii_work);
flush_workqueue(bond->wq);
}
}
if (!bond->params.arp_targets[0]) {
printk(KERN_INFO DRV_NAME
": %s: ARP monitoring has been set up, "
"but no ARP targets have been specified.\n",
bond->dev->name);
}
if (bond->dev->flags & IFF_UP) {
/* If the interface is up, we may need to fire off
* the ARP timer. If the interface is down, the
* timer will get fired off when the open function
* is called.
*/
if (!delayed_work_pending(&bond->arp_work)) {
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
INIT_DELAYED_WORK(&bond->arp_work,
bond_activebackup_arp_mon);
else
INIT_DELAYED_WORK(&bond->arp_work,
bond_loadbalance_arp_mon);
queue_delayed_work(bond->wq, &bond->arp_work, 0);
}
}
out:
return ret;
}
static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
/*
* Show and set the arp targets.
*/
static ssize_t bonding_show_arp_targets(struct device *d,
struct device_attribute *attr,
char *buf)
{
int i, res = 0;
struct bonding *bond = to_bond(d);
for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
if (bond->params.arp_targets[i])
res += sprintf(buf + res, "%u.%u.%u.%u ",
NIPQUAD(bond->params.arp_targets[i]));
}
if (res)
buf[res-1] = '\n'; /* eat the leftover space */
return res;
}
static ssize_t bonding_store_arp_targets(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
__be32 newtarget;
int i = 0, done = 0, ret = count;
struct bonding *bond = to_bond(d);
__be32 *targets;
targets = bond->params.arp_targets;
newtarget = in_aton(buf + 1);
/* look for adds */
if (buf[0] == '+') {
if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
printk(KERN_ERR DRV_NAME
": %s: invalid ARP target %u.%u.%u.%u specified for addition\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
/* look for an empty slot to put the target in, and check for dupes */
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
if (targets[i] == newtarget) { /* duplicate */
printk(KERN_ERR DRV_NAME
": %s: ARP target %u.%u.%u.%u is already present\n",
bond->dev->name, NIPQUAD(newtarget));
if (done)
targets[i] = 0;
ret = -EINVAL;
goto out;
}
if (targets[i] == 0 && !done) {
printk(KERN_INFO DRV_NAME
": %s: adding ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
done = 1;
targets[i] = newtarget;
}
}
if (!done) {
printk(KERN_ERR DRV_NAME
": %s: ARP target table is full!\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
}
else if (buf[0] == '-') {
if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
printk(KERN_ERR DRV_NAME
": %s: invalid ARP target %d.%d.%d.%d specified for removal\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
if (targets[i] == newtarget) {
printk(KERN_INFO DRV_NAME
": %s: removing ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
targets[i] = 0;
done = 1;
}
}
if (!done) {
printk(KERN_INFO DRV_NAME
": %s: unable to remove nonexistent ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
}
else {
printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
out:
return ret;
}
static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
/*
* Show and set the up and down delays. These must be multiples of the
* MII monitoring value, and are stored internally as the multiplier.
* Thus, we must translate to MS for the real world.
*/
static ssize_t bonding_show_downdelay(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
}
static ssize_t bonding_store_downdelay(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (!(bond->params.miimon)) {
printk(KERN_ERR DRV_NAME
": %s: Unable to set down delay as MII monitoring is disabled\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no down delay value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
if ((new_value % bond->params.miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: down delay (%d) is not a multiple "
"of miimon (%d), delay rounded to %d ms\n",
bond->dev->name, new_value, bond->params.miimon,
(new_value / bond->params.miimon) *
bond->params.miimon);
}
bond->params.downdelay = new_value / bond->params.miimon;
printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
bond->dev->name, bond->params.downdelay * bond->params.miimon);
}
out:
return ret;
}
static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
static ssize_t bonding_show_updelay(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
}
static ssize_t bonding_store_updelay(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (!(bond->params.miimon)) {
printk(KERN_ERR DRV_NAME
": %s: Unable to set up delay as MII monitoring is disabled\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no up delay value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
if ((new_value % bond->params.miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: up delay (%d) is not a multiple "
"of miimon (%d), updelay rounded to %d ms\n",
bond->dev->name, new_value, bond->params.miimon,
(new_value / bond->params.miimon) *
bond->params.miimon);
}
bond->params.updelay = new_value / bond->params.miimon;
printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
bond->dev->name, bond->params.updelay * bond->params.miimon);
}
out:
return ret;
}
static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
/*
* Show and set the LACP interval. Interface must be down, and the mode
* must be set to 802.3ad mode.
*/
static ssize_t bonding_show_lacp(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
bond_lacp_tbl[bond->params.lacp_fast].modename,
bond->params.lacp_fast);
}
static ssize_t bonding_store_lacp(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": %s: Unable to update LACP rate because interface is up.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (bond->params.mode != BOND_MODE_8023AD) {
printk(KERN_ERR DRV_NAME
": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm(buf, bond_lacp_tbl);
if ((new_value == 1) || (new_value == 0)) {
bond->params.lacp_fast = new_value;
printk(KERN_INFO DRV_NAME
": %s: Setting LACP rate to %s (%d).\n",
bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
} else {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid LACP rate value %.*s.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
ret = -EINVAL;
}
out:
return ret;
}
static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
/*
* Show and set the number of grat ARP to send after a failover event.
*/
static ssize_t bonding_show_n_grat_arp(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.num_grat_arp);
}
static ssize_t bonding_store_n_grat_arp(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no num_grat_arp value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0 || new_value > 255) {
printk(KERN_ERR DRV_NAME
": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
bond->dev->name, new_value);
ret = -EINVAL;
goto out;
} else {
bond->params.num_grat_arp = new_value;
}
out:
return ret;
}
static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR, bonding_show_n_grat_arp, bonding_store_n_grat_arp);
/*
* Show and set the MII monitor interval. There are two tricky bits
* here. First, if MII monitoring is activated, then we must disable
* ARP monitoring. Second, if the timer isn't running, we must
* start it.
*/
static ssize_t bonding_show_miimon(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.miimon);
}
static ssize_t bonding_store_miimon(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no miimon value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
printk(KERN_INFO DRV_NAME
": %s: Setting MII monitoring interval to %d.\n",
bond->dev->name, new_value);
bond->params.miimon = new_value;
if(bond->params.updelay)
printk(KERN_INFO DRV_NAME
": %s: Note: Updating updelay (to %d) "
"since it is a multiple of the miimon value.\n",
bond->dev->name,
bond->params.updelay * bond->params.miimon);
if(bond->params.downdelay)
printk(KERN_INFO DRV_NAME
": %s: Note: Updating downdelay (to %d) "
"since it is a multiple of the miimon value.\n",
bond->dev->name,
bond->params.downdelay * bond->params.miimon);
if (bond->params.arp_interval) {
printk(KERN_INFO DRV_NAME
": %s: MII monitoring cannot be used with "
"ARP monitoring. Disabling ARP monitoring...\n",
bond->dev->name);
bond->params.arp_interval = 0;
if (bond->params.arp_validate) {
bond_unregister_arp(bond);
bond->params.arp_validate =
BOND_ARP_VALIDATE_NONE;
}
if (delayed_work_pending(&bond->arp_work)) {
cancel_delayed_work(&bond->arp_work);
flush_workqueue(bond->wq);
}
}
if (bond->dev->flags & IFF_UP) {
/* If the interface is up, we may need to fire off
* the MII timer. If the interface is down, the
* timer will get fired off when the open function
* is called.
*/
if (!delayed_work_pending(&bond->mii_work)) {
INIT_DELAYED_WORK(&bond->mii_work,
bond_mii_monitor);
queue_delayed_work(bond->wq,
&bond->mii_work, 0);
}
}
}
out:
return ret;
}
static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
/*
* Show and set the primary slave. The store function is much
* simpler than bonding_store_slaves function because it only needs to
* handle one interface name.
* The bond must be a mode that supports a primary for this be
* set.
*/
static ssize_t bonding_show_primary(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->primary_slave)
count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
return count;
}
static ssize_t bonding_store_primary(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int i;
struct slave *slave;
struct bonding *bond = to_bond(d);
rtnl_lock();
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
if (!USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: Unable to set primary slave; %s is in mode %d\n",
bond->dev->name, bond->dev->name, bond->params.mode);
} else {
bond_for_each_slave(bond, slave, i) {
if (strnicmp
(slave->dev->name, buf,
strlen(slave->dev->name)) == 0) {
printk(KERN_INFO DRV_NAME
": %s: Setting %s as primary slave.\n",
bond->dev->name, slave->dev->name);
bond->primary_slave = slave;
bond_select_active_slave(bond);
goto out;
}
}
/* if we got here, then we didn't match the name of any slave */
if (strlen(buf) == 0 || buf[0] == '\n') {
printk(KERN_INFO DRV_NAME
": %s: Setting primary slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
bond_select_active_slave(bond);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
}
}
out:
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
rtnl_unlock();
return count;
}
static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
/*
* Show and set the use_carrier flag.
*/
static ssize_t bonding_show_carrier(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.use_carrier);
}
static ssize_t bonding_store_carrier(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no use_carrier value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if ((new_value == 0) || (new_value == 1)) {
bond->params.use_carrier = new_value;
printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
bond->dev->name, new_value);
} else {
printk(KERN_INFO DRV_NAME
": %s: Ignoring invalid use_carrier value %d.\n",
bond->dev->name, new_value);
}
out:
return count;
}
static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
/*
* Show and set currently active_slave.
*/
static ssize_t bonding_show_active_slave(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct slave *curr;
struct bonding *bond = to_bond(d);
int count = 0;
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (USES_PRIMARY(bond->params.mode) && curr)
count = sprintf(buf, "%s\n", curr->dev->name);
return count;
}
static ssize_t bonding_store_active_slave(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int i;
struct slave *slave;
struct slave *old_active = NULL;
struct slave *new_active = NULL;
struct bonding *bond = to_bond(d);
rtnl_lock();
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
if (!USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: Unable to change active slave; %s is in mode %d\n",
bond->dev->name, bond->dev->name, bond->params.mode);
} else {
bond_for_each_slave(bond, slave, i) {
if (strnicmp
(slave->dev->name, buf,
strlen(slave->dev->name)) == 0) {
old_active = bond->curr_active_slave;
new_active = slave;
if (new_active == old_active) {
/* do nothing */
printk(KERN_INFO DRV_NAME
": %s: %s is already the current active slave.\n",
bond->dev->name, slave->dev->name);
goto out;
}
else {
if ((new_active) &&
(old_active) &&
(new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
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);
}
else {
printk(KERN_INFO DRV_NAME
": %s: Could not set %s as active slave; "
"either %s is down or the link is down.\n",
bond->dev->name, slave->dev->name,
slave->dev->name);
}
goto out;
}
}
}
/* if we got here, then we didn't match the name of any slave */
if (strlen(buf) == 0 || buf[0] == '\n') {
printk(KERN_INFO DRV_NAME
": %s: Setting active slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
bond_select_active_slave(bond);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as active slave as it is not a slave.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
}
}
out:
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
rtnl_unlock();
return count;
}
static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
/*
* Show link status of the bond interface.
*/
static ssize_t bonding_show_mii_status(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct slave *curr;
struct bonding *bond = to_bond(d);
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
return sprintf(buf, "%s\n", (curr) ? "up" : "down");
}
static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
/*
* Show current 802.3ad aggregator ID.
*/
static ssize_t bonding_show_ad_aggregator(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.aggregator_id);
}
return count;
}
static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
/*
* Show number of active 802.3ad ports.
*/
static ssize_t bonding_show_ad_num_ports(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0: ad_info.ports);
}
return count;
}
static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
/*
* Show current 802.3ad actor key.
*/
static ssize_t bonding_show_ad_actor_key(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.actor_key);
}
return count;
}
static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
/*
* Show current 802.3ad partner key.
*/
static ssize_t bonding_show_ad_partner_key(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.partner_key);
}
return count;
}
static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
/*
* Show current 802.3ad partner mac.
*/
static ssize_t bonding_show_ad_partner_mac(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
DECLARE_MAC_BUF(mac);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
count = sprintf(buf,"%s\n",
print_mac(mac, ad_info.partner_system));
}
}
return count;
}
static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
static struct attribute *per_bond_attrs[] = {
&dev_attr_slaves.attr,
&dev_attr_mode.attr,
&dev_attr_fail_over_mac.attr,
&dev_attr_arp_validate.attr,
&dev_attr_arp_interval.attr,
&dev_attr_arp_ip_target.attr,
&dev_attr_downdelay.attr,
&dev_attr_updelay.attr,
&dev_attr_lacp_rate.attr,
&dev_attr_xmit_hash_policy.attr,
&dev_attr_num_grat_arp.attr,
&dev_attr_miimon.attr,
&dev_attr_primary.attr,
&dev_attr_use_carrier.attr,
&dev_attr_active_slave.attr,
&dev_attr_mii_status.attr,
&dev_attr_ad_aggregator.attr,
&dev_attr_ad_num_ports.attr,
&dev_attr_ad_actor_key.attr,
&dev_attr_ad_partner_key.attr,
&dev_attr_ad_partner_mac.attr,
NULL,
};
static struct attribute_group bonding_group = {
.name = "bonding",
.attrs = per_bond_attrs,
};
/*
* Initialize sysfs. This sets up the bonding_masters file in
* /sys/class/net.
*/
int bond_create_sysfs(void)
{
int ret;
ret = netdev_class_create_file(&class_attr_bonding_masters);
/*
* Permit multiple loads of the module by ignoring failures to
* create the bonding_masters sysfs file. Bonding devices
* created by second or subsequent loads of the module will
* not be listed in, or controllable by, bonding_masters, but
* will have the usual "bonding" sysfs directory.
*
* This is done to preserve backwards compatibility for
* initscripts/sysconfig, which load bonding multiple times to
* configure multiple bonding devices.
*/
if (ret == -EEXIST) {
/* Is someone being kinky and naming a device bonding_master? */
if (__dev_get_by_name(&init_net,
class_attr_bonding_masters.attr.name))
printk(KERN_ERR
"network device named %s already exists in sysfs",
class_attr_bonding_masters.attr.name);
}
return ret;
}
/*
* Remove /sys/class/net/bonding_masters.
*/
void bond_destroy_sysfs(void)
{
netdev_class_remove_file(&class_attr_bonding_masters);
}
/*
* Initialize sysfs for each bond. This sets up and registers
* the 'bondctl' directory for each individual bond under /sys/class/net.
*/
int bond_create_sysfs_entry(struct bonding *bond)
{
struct net_device *dev = bond->dev;
int err;
err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
if (err) {
printk(KERN_EMERG "eek! didn't create group!\n");
}
if (expected_refcount < 1)
expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
return err;
}
/*
* Remove sysfs entries for each bond.
*/
void bond_destroy_sysfs_entry(struct bonding *bond)
{
struct net_device *dev = bond->dev;
sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
}
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