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();
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