1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
new file mode 100644
index 000000000000..9a5223c7b4d1
--- /dev/null
+++ b/drivers/net/bonding/bond_options.c
@@ -0,0 +1,142 @@
+/*
+ * drivers/net/bond/bond_options.c - bonding options
+ * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <linux/rwlock.h>
+#include <linux/rcupdate.h>
+#include "bonding.h"
+
+static bool bond_mode_is_valid(int mode)
+{
+        int i;
+
+        for (i = 0; bond_mode_tbl[i].modename; i++);
+
+        return mode >= 0 && mode < i;
+}
+
+int bond_option_mode_set(struct bonding *bond, int mode)
+{
+        if (!bond_mode_is_valid(mode)) {
+                pr_err("invalid mode value %d.\n", mode);
+                return -EINVAL;
+        }
+
+        if (bond->dev->flags & IFF_UP) {
+                pr_err("%s: unable to update mode because interface is up.\n",
+                       bond->dev->name);
+                return -EPERM;
+        }
+
+        if (bond_has_slaves(bond)) {
+                pr_err("%s: unable to update mode because bond has slaves.\n",
+                        bond->dev->name);
+                return -EPERM;
+        }
+
+        if (BOND_MODE_IS_LB(mode) && bond->params.arp_interval) {
+                pr_err("%s: %s mode is incompatible with arp monitoring.\n",
+                       bond->dev->name, bond_mode_tbl[mode].modename);
+                return -EINVAL;
+        }
+
+        /* don't cache arp_validate between modes */
+        bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
+        bond->params.mode = mode;
+        return 0;
+}
+
+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;
+}
+
+struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
+{
+        struct slave *slave = rcu_dereference(bond->curr_active_slave);
+
+        return __bond_option_active_slave_get(bond, slave);
+}
+
+struct net_device *bond_option_active_slave_get(struct bonding *bond)
+{
+        return __bond_option_active_slave_get(bond, bond->curr_active_slave);
+}
+
+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;
+}