Commit | Line | Data |
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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 | ||
fe9d04af | 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); | |
72be35fe JP |
57 | } |
58 | ||
59 | /* don't cache arp_validate between modes */ | |
60 | bond->params.arp_validate = BOND_ARP_VALIDATE_NONE; | |
61 | bond->params.mode = mode; | |
62 | return 0; | |
63 | } | |
d9e32b21 | 64 | |
752d48b5 JP |
65 | static struct net_device *__bond_option_active_slave_get(struct bonding *bond, |
66 | struct slave *slave) | |
67 | { | |
68 | return USES_PRIMARY(bond->params.mode) && slave ? slave->dev : NULL; | |
69 | } | |
70 | ||
71 | struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond) | |
72 | { | |
73 | struct slave *slave = rcu_dereference(bond->curr_active_slave); | |
74 | ||
75 | return __bond_option_active_slave_get(bond, slave); | |
76 | } | |
77 | ||
78 | struct net_device *bond_option_active_slave_get(struct bonding *bond) | |
79 | { | |
80 | return __bond_option_active_slave_get(bond, bond->curr_active_slave); | |
81 | } | |
82 | ||
d9e32b21 JP |
83 | int bond_option_active_slave_set(struct bonding *bond, |
84 | struct net_device *slave_dev) | |
85 | { | |
86 | int ret = 0; | |
87 | ||
88 | if (slave_dev) { | |
89 | if (!netif_is_bond_slave(slave_dev)) { | |
90 | pr_err("Device %s is not bonding slave.\n", | |
91 | slave_dev->name); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
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); | |
98 | return -EINVAL; | |
99 | } | |
100 | } | |
101 | ||
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); | |
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | block_netpoll_tx(); | |
109 | read_lock(&bond->lock); | |
110 | write_lock_bh(&bond->curr_slave_lock); | |
111 | ||
112 | /* check to see if we are clearing active */ | |
113 | if (!slave_dev) { | |
114 | pr_info("%s: Clearing current active slave.\n", | |
115 | bond->dev->name); | |
116 | rcu_assign_pointer(bond->curr_active_slave, NULL); | |
117 | bond_select_active_slave(bond); | |
118 | } else { | |
119 | struct slave *old_active = bond->curr_active_slave; | |
120 | struct slave *new_active = bond_slave_get_rtnl(slave_dev); | |
121 | ||
122 | BUG_ON(!new_active); | |
123 | ||
124 | if (new_active == old_active) { | |
125 | /* do nothing */ | |
126 | pr_info("%s: %s is already the current active slave.\n", | |
127 | bond->dev->name, new_active->dev->name); | |
128 | } else { | |
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); | |
134 | } else { | |
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); | |
138 | ret = -EINVAL; | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | write_unlock_bh(&bond->curr_slave_lock); | |
144 | read_unlock(&bond->lock); | |
145 | unblock_netpoll_tx(); | |
146 | return ret; | |
147 | } |