2 * drivers/net/bond/bond_options.c - bonding options
3 * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/errno.h>
15 #include <linux/netdevice.h>
16 #include <linux/rwlock.h>
17 #include <linux/rcupdate.h>
20 static bool bond_mode_is_valid(int mode)
24 for (i = 0; bond_mode_tbl[i].modename; i++);
26 return mode >= 0 && mode < i;
29 int bond_option_mode_set(struct bonding *bond, int mode)
31 if (!bond_mode_is_valid(mode)) {
32 pr_err("invalid mode value %d.\n", mode);
36 if (bond->dev->flags & IFF_UP) {
37 pr_err("%s: unable to update mode because interface is up.\n",
42 if (bond_has_slaves(bond)) {
43 pr_err("%s: unable to update mode because bond has slaves.\n",
48 if (BOND_NO_USES_ARP(mode) && bond->params.arp_interval) {
49 pr_info("%s: %s mode is incompatible with arp monitoring, start mii monitoring\n",
50 bond->dev->name, bond_mode_tbl[mode].modename);
51 /* disable arp monitoring */
52 bond->params.arp_interval = 0;
53 /* set miimon to default value */
54 bond->params.miimon = BOND_DEFAULT_MIIMON;
55 pr_info("%s: Setting MII monitoring interval to %d.\n",
56 bond->dev->name, bond->params.miimon);
59 /* don't cache arp_validate between modes */
60 bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
61 bond->params.mode = mode;
65 static struct net_device *__bond_option_active_slave_get(struct bonding *bond,
68 return USES_PRIMARY(bond->params.mode) && slave ? slave->dev : NULL;
71 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
73 struct slave *slave = rcu_dereference(bond->curr_active_slave);
75 return __bond_option_active_slave_get(bond, slave);
78 struct net_device *bond_option_active_slave_get(struct bonding *bond)
80 return __bond_option_active_slave_get(bond, bond->curr_active_slave);
83 int bond_option_active_slave_set(struct bonding *bond,
84 struct net_device *slave_dev)
89 if (!netif_is_bond_slave(slave_dev)) {
90 pr_err("Device %s is not bonding slave.\n",
95 if (bond->dev != netdev_master_upper_dev_get(slave_dev)) {
96 pr_err("%s: Device %s is not our slave.\n",
97 bond->dev->name, slave_dev->name);
102 if (!USES_PRIMARY(bond->params.mode)) {
103 pr_err("%s: Unable to change active slave; %s is in mode %d\n",
104 bond->dev->name, bond->dev->name, bond->params.mode);
109 read_lock(&bond->lock);
110 write_lock_bh(&bond->curr_slave_lock);
112 /* check to see if we are clearing active */
114 pr_info("%s: Clearing current active slave.\n",
116 rcu_assign_pointer(bond->curr_active_slave, NULL);
117 bond_select_active_slave(bond);
119 struct slave *old_active = bond->curr_active_slave;
120 struct slave *new_active = bond_slave_get_rtnl(slave_dev);
124 if (new_active == old_active) {
126 pr_info("%s: %s is already the current active slave.\n",
127 bond->dev->name, new_active->dev->name);
129 if (old_active && (new_active->link == BOND_LINK_UP) &&
130 IS_UP(new_active->dev)) {
131 pr_info("%s: Setting %s as active slave.\n",
132 bond->dev->name, new_active->dev->name);
133 bond_change_active_slave(bond, new_active);
135 pr_err("%s: Could not set %s as active slave; either %s is down or the link is down.\n",
136 bond->dev->name, new_active->dev->name,
137 new_active->dev->name);
143 write_unlock_bh(&bond->curr_slave_lock);
144 read_unlock(&bond->lock);
145 unblock_netpoll_tx();