static struct net_device *__bond_option_active_slave_get(struct bonding *bond,
struct slave *slave)
{
return USES_PRIMARY(bond->params.mode) && slave ? slave->dev : NULL;
}
int bond_option_active_slave_set(struct bonding *bond,
struct net_device *slave_dev)
{
int ret = 0;
if (slave_dev) {
if (!netif_is_bond_slave(slave_dev)) {
pr_err("Device %s is not bonding slave.\n",
slave_dev->name);
return -EINVAL;
}
if (bond->dev != netdev_master_upper_dev_get(slave_dev)) {
pr_err("%s: Device %s is not our slave.\n",
bond->dev->name, slave_dev->name);
return -EINVAL;
}
}
if (!USES_PRIMARY(bond->params.mode)) {
pr_err("%s: Unable to change active slave; %s is in mode %d\n",
bond->dev->name, bond->dev->name, bond->params.mode);
return -EINVAL;
}
block_netpoll_tx();
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
/* check to see if we are clearing active */
if (!slave_dev) {
pr_info("%s: Clearing current active slave.\n",
bond->dev->name);
rcu_assign_pointer(bond->curr_active_slave, NULL);
bond_select_active_slave(bond);
} else {
struct slave *old_active = bond->curr_active_slave;
struct slave *new_active = bond_slave_get_rtnl(slave_dev);
BUG_ON(!new_active);
if (new_active == old_active) {
/* do nothing */
pr_info("%s: %s is already the current active slave.\n",
bond->dev->name, new_active->dev->name);
} else {
if (old_active && (new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
pr_info("%s: Setting %s as active slave.\n",
bond->dev->name, new_active->dev->name);
bond_change_active_slave(bond, new_active);
} else {
pr_err("%s: Could not set %s as active slave; either %s is down or the link is down.\n",
bond->dev->name, new_active->dev->name,
new_active->dev->name);
ret = -EINVAL;
}
}
}
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
unblock_netpoll_tx();
return ret;
}