bonding: add fail_over_mac attribute netlink support

Add IFLA_BOND_FAIL_OVER_MAC to allow get/set of bonding parameter
fail_over_mac via netlink.

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 39 insertions, 18 deletions

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index b361c674dc00..dc465ad3fb7c 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -34,6 +34,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
         [IFLA_BOND_ARP_ALL_TARGETS]     = { .type = NLA_U32 },
         [IFLA_BOND_PRIMARY]             = { .type = NLA_U32 },
         [IFLA_BOND_PRIMARY_RESELECT]    = { .type = NLA_U8 },
+        [IFLA_BOND_FAIL_OVER_MAC]       = { .type = NLA_U8 },
 };
 
 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -177,6 +178,14 @@ static int bond_changelink(struct net_device *bond_dev,
                 if (err)
                         return err;
         }
+        if (data[IFLA_BOND_FAIL_OVER_MAC]) {
+                int fail_over_mac =
+                        nla_get_u8(data[IFLA_BOND_FAIL_OVER_MAC]);
+
+                err = bond_option_fail_over_mac_set(bond, fail_over_mac);
+                if (err)
+                        return err;
+        }
         return 0;
 }
 
@@ -207,6 +216,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_ARP_ALL_TARGETS */
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_PRIMARY */
                 nla_total_size(sizeof(u8)) +    /* IFLA_BOND_PRIMARY_RESELECT */
+                nla_total_size(sizeof(u8)) +    /* IFLA_BOND_FAIL_OVER_MAC */
                 0;
 }
 
@@ -275,6 +285,10 @@ static int bond_fill_info(struct sk_buff *skb,
                        bond->params.primary_reselect))
                 goto nla_put_failure;
 
+        if (nla_put_u8(skb, IFLA_BOND_FAIL_OVER_MAC,
+                       bond->params.fail_over_mac))
+                goto nla_put_failure;
+
         return 0;
 
 nla_put_failure:
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index 80a9df4e4bf7..86f462008932 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -535,3 +535,19 @@ int bond_option_primary_reselect_set(struct bonding *bond, int primary_reselect)
 
         return 0;
 }
+
+int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac)
+{
+        if (bond_has_slaves(bond)) {
+                pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
+                       bond->dev->name);
+                return -EPERM;
+        }
+
+        bond->params.fail_over_mac = fail_over_mac;
+        pr_info("%s: Setting fail_over_mac to %s (%d).\n",
+                bond->dev->name, fail_over_mac_tbl[fail_over_mac].modename,
+                fail_over_mac);
+
+        return 0;
+}
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 324afa5fda93..c84a90f9a0ac 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -442,33 +442,23 @@ static ssize_t bonding_store_fail_over_mac(struct device *d,
                                            struct device_attribute *attr,
                                            const char *buf, size_t count)
 {
-        int new_value, ret = count;
+        int new_value, ret;
         struct bonding *bond = to_bond(d);
 
-        if (!rtnl_trylock())
-                return restart_syscall();
-
-        if (bond_has_slaves(bond)) {
-                pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
-                       bond->dev->name);
-                ret = -EPERM;
-                goto out;
-        }
-
         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
         if (new_value < 0) {
                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
                        bond->dev->name, buf);
-                ret = -EINVAL;
-                goto out;
+                return -EINVAL;
         }
 
-        bond->params.fail_over_mac = new_value;
-        pr_info("%s: Setting fail_over_mac to %s (%d).\n",
-                bond->dev->name, fail_over_mac_tbl[new_value].modename,
-                new_value);
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        ret = bond_option_fail_over_mac_set(bond, new_value);
+        if (!ret)
+                ret = count;
 
-out:
         rtnl_unlock();
         return ret;
 }
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 4e89d0480a5e..b69059b361a0 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -457,6 +457,7 @@ int bond_option_arp_all_targets_set(struct bonding *bond, int arp_all_targets);
 int bond_option_primary_set(struct bonding *bond, const char *primary);
 int bond_option_primary_reselect_set(struct bonding *bond,
                                      int primary_reselect);
+int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac);
 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 struct net_device *bond_option_active_slave_get(struct bonding *bond);