bonding: add slave_changelink support and use it for queue_id

This patch adds support for slave_changelink to the bonding and uses it
to give the ability to change the queue_id of the enslaved devices via
netlink. It sets slave_maxtype and uses bond_changelink as a prototype for
bond_slave_changelink.
Example/test command after the iproute2 patch:
 ip link set eth0 type bond_slave queue_id 10

CC: David S. Miller <davem@davemloft.net>
CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>

Suggested-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index d163e112f04c..1570deab112e 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -107,6 +107,33 @@ static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
         return 0;
 }
 
+static int bond_slave_changelink(struct net_device *bond_dev,
+                                 struct net_device *slave_dev,
+                                 struct nlattr *tb[], struct nlattr *data[])
+{
+        struct bonding *bond = netdev_priv(bond_dev);
+        struct bond_opt_value newval;
+        int err;
+
+        if (!data)
+                return 0;
+
+        if (data[IFLA_BOND_SLAVE_QUEUE_ID]) {
+                u16 queue_id = nla_get_u16(data[IFLA_BOND_SLAVE_QUEUE_ID]);
+                char queue_id_str[IFNAMSIZ + 7];
+
+                /* queue_id option setting expects slave_name:queue_id */
+                snprintf(queue_id_str, sizeof(queue_id_str), "%s:%u\n",
+                         slave_dev->name, queue_id);
+                bond_opt_initstr(&newval, queue_id_str);
+                err = __bond_opt_set(bond, BOND_OPT_QUEUE_ID, &newval);
+                if (err)
+                        return err;
+        }
+
+        return 0;
+}
+
 static int bond_changelink(struct net_device *bond_dev,
                            struct nlattr *tb[], struct nlattr *data[])
 {
@@ -553,10 +580,12 @@ struct rtnl_link_ops bond_link_ops __read_mostly = {
         .priv_size              = sizeof(struct bonding),
         .setup                  = bond_setup,
         .maxtype                = IFLA_BOND_MAX,
+        .slave_maxtype          = IFLA_BOND_SLAVE_MAX,
         .policy                 = bond_policy,
         .validate               = bond_validate,
         .newlink                = bond_newlink,
         .changelink             = bond_changelink,
+        .slave_changelink       = bond_slave_changelink,
         .get_size               = bond_get_size,
         .fill_info              = bond_fill_info,
         .get_num_tx_queues      = bond_get_num_tx_queues,