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72be35fe JP |
1 | /* |
2 | * drivers/net/bond/bond_options.c - bonding options | |
3 | * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us> | |
4 | * | |
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. | |
9 | */ | |
10 | ||
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
13 | #include <linux/errno.h> | |
14 | #include <linux/if.h> | |
d9e32b21 JP |
15 | #include <linux/netdevice.h> |
16 | #include <linux/rwlock.h> | |
17 | #include <linux/rcupdate.h> | |
72be35fe JP |
18 | #include "bonding.h" |
19 | ||
20 | static bool bond_mode_is_valid(int mode) | |
21 | { | |
22 | int i; | |
23 | ||
24 | for (i = 0; bond_mode_tbl[i].modename; i++); | |
25 | ||
26 | return mode >= 0 && mode < i; | |
27 | } | |
28 | ||
29 | int bond_option_mode_set(struct bonding *bond, int mode) | |
30 | { | |
31 | if (!bond_mode_is_valid(mode)) { | |
32 | pr_err("invalid mode value %d.\n", mode); | |
33 | return -EINVAL; | |
34 | } | |
35 | ||
36 | if (bond->dev->flags & IFF_UP) { | |
37 | pr_err("%s: unable to update mode because interface is up.\n", | |
38 | bond->dev->name); | |
39 | return -EPERM; | |
40 | } | |
41 | ||
42 | if (bond_has_slaves(bond)) { | |
43 | pr_err("%s: unable to update mode because bond has slaves.\n", | |
44 | bond->dev->name); | |
45 | return -EPERM; | |
46 | } | |
47 | ||
48 | if (BOND_MODE_IS_LB(mode) && bond->params.arp_interval) { | |
49 | pr_err("%s: %s mode is incompatible with arp monitoring.\n", | |
50 | bond->dev->name, bond_mode_tbl[mode].modename); | |
51 | return -EINVAL; | |
52 | } | |
53 | ||
54 | /* don't cache arp_validate between modes */ | |
55 | bond->params.arp_validate = BOND_ARP_VALIDATE_NONE; | |
56 | bond->params.mode = mode; | |
57 | return 0; | |
58 | } | |
d9e32b21 | 59 | |
752d48b5 JP |
60 | static struct net_device *__bond_option_active_slave_get(struct bonding *bond, |
61 | struct slave *slave) | |
62 | { | |
63 | return USES_PRIMARY(bond->params.mode) && slave ? slave->dev : NULL; | |
64 | } | |
65 | ||
66 | struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond) | |
67 | { | |
68 | struct slave *slave = rcu_dereference(bond->curr_active_slave); | |
69 | ||
70 | return __bond_option_active_slave_get(bond, slave); | |
71 | } | |
72 | ||
73 | struct net_device *bond_option_active_slave_get(struct bonding *bond) | |
74 | { | |
75 | return __bond_option_active_slave_get(bond, bond->curr_active_slave); | |
76 | } | |
77 | ||
d9e32b21 JP |
78 | int bond_option_active_slave_set(struct bonding *bond, |
79 | struct net_device *slave_dev) | |
80 | { | |
81 | int ret = 0; | |
82 | ||
83 | if (slave_dev) { | |
84 | if (!netif_is_bond_slave(slave_dev)) { | |
85 | pr_err("Device %s is not bonding slave.\n", | |
86 | slave_dev->name); | |
87 | return -EINVAL; | |
88 | } | |
89 | ||
90 | if (bond->dev != netdev_master_upper_dev_get(slave_dev)) { | |
91 | pr_err("%s: Device %s is not our slave.\n", | |
92 | bond->dev->name, slave_dev->name); | |
93 | return -EINVAL; | |
94 | } | |
95 | } | |
96 | ||
97 | if (!USES_PRIMARY(bond->params.mode)) { | |
98 | pr_err("%s: Unable to change active slave; %s is in mode %d\n", | |
99 | bond->dev->name, bond->dev->name, bond->params.mode); | |
100 | return -EINVAL; | |
101 | } | |
102 | ||
103 | block_netpoll_tx(); | |
104 | read_lock(&bond->lock); | |
105 | write_lock_bh(&bond->curr_slave_lock); | |
106 | ||
107 | /* check to see if we are clearing active */ | |
108 | if (!slave_dev) { | |
109 | pr_info("%s: Clearing current active slave.\n", | |
110 | bond->dev->name); | |
111 | rcu_assign_pointer(bond->curr_active_slave, NULL); | |
112 | bond_select_active_slave(bond); | |
113 | } else { | |
114 | struct slave *old_active = bond->curr_active_slave; | |
115 | struct slave *new_active = bond_slave_get_rtnl(slave_dev); | |
116 | ||
117 | BUG_ON(!new_active); | |
118 | ||
119 | if (new_active == old_active) { | |
120 | /* do nothing */ | |
121 | pr_info("%s: %s is already the current active slave.\n", | |
122 | bond->dev->name, new_active->dev->name); | |
123 | } else { | |
124 | if (old_active && (new_active->link == BOND_LINK_UP) && | |
125 | IS_UP(new_active->dev)) { | |
126 | pr_info("%s: Setting %s as active slave.\n", | |
127 | bond->dev->name, new_active->dev->name); | |
128 | bond_change_active_slave(bond, new_active); | |
129 | } else { | |
130 | pr_err("%s: Could not set %s as active slave; either %s is down or the link is down.\n", | |
131 | bond->dev->name, new_active->dev->name, | |
132 | new_active->dev->name); | |
133 | ret = -EINVAL; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | write_unlock_bh(&bond->curr_slave_lock); | |
139 | read_unlock(&bond->lock); | |
140 | unblock_netpoll_tx(); | |
141 | return ret; | |
142 | } |