bonding: add arp_interval netlink support

Add IFLA_BOND_ARP_INTERVAL to allow get/set of bonding parameter
arp_interval via netlink.

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

5 files changed, 80 insertions, 51 deletions

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 7edf6399cea2..58e71235b75f 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -28,6 +28,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
         [IFLA_BOND_UPDELAY]             = { .type = NLA_U32 },
         [IFLA_BOND_DOWNDELAY]           = { .type = NLA_U32 },
         [IFLA_BOND_USE_CARRIER]         = { .type = NLA_U8 },
+        [IFLA_BOND_ARP_INTERVAL]        = { .type = NLA_U32 },
 };
 
 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -45,6 +46,7 @@ static int bond_changelink(struct net_device *bond_dev,
                            struct nlattr *tb[], struct nlattr *data[])
 {
         struct bonding *bond = netdev_priv(bond_dev);
+        int miimon = 0;
         int err;
 
         if (!data)
@@ -74,7 +76,7 @@ static int bond_changelink(struct net_device *bond_dev,
                         return err;
         }
         if (data[IFLA_BOND_MIIMON]) {
-                int miimon = nla_get_u32(data[IFLA_BOND_MIIMON]);
+                miimon = nla_get_u32(data[IFLA_BOND_MIIMON]);
 
                 err = bond_option_miimon_set(bond, miimon);
                 if (err)
@@ -101,6 +103,19 @@ static int bond_changelink(struct net_device *bond_dev,
                 if (err)
                         return err;
         }
+        if (data[IFLA_BOND_ARP_INTERVAL]) {
+                int arp_interval = nla_get_u32(data[IFLA_BOND_ARP_INTERVAL]);
+
+                if (arp_interval && miimon) {
+                        pr_err("%s: ARP monitoring cannot be used with MII monitoring.\n",
+                               bond->dev->name);
+                        return -EINVAL;
+                }
+
+                err = bond_option_arp_interval_set(bond, arp_interval);
+                if (err)
+                        return err;
+        }
         return 0;
 }
 
@@ -124,6 +139,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_UPDELAY */
                 nla_total_size(sizeof(u32)) +   /* IFLA_BOND_DOWNDELAY */
                 nla_total_size(sizeof(u8)) +    /* IFLA_BOND_USE_CARRIER */
+                nla_total_size(sizeof(u32)) +   /* IFLA_BOND_ARP_INTERVAL */
                 0;
 }
 
@@ -154,6 +170,9 @@ static int bond_fill_info(struct sk_buff *skb,
         if (nla_put_u8(skb, IFLA_BOND_USE_CARRIER, bond->params.use_carrier))
                 goto nla_put_failure;
 
+        if (nla_put_u32(skb, IFLA_BOND_ARP_INTERVAL, bond->params.arp_interval))
+                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 6fc7bbf0b85f..a84e729d02ef 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -259,3 +259,50 @@ int bond_option_use_carrier_set(struct bonding *bond, int use_carrier)
 
         return 0;
 }
+
+int bond_option_arp_interval_set(struct bonding *bond, int arp_interval)
+{
+        if (arp_interval < 0) {
+                pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
+                       bond->dev->name, arp_interval, INT_MAX);
+                return -EINVAL;
+        }
+        if (BOND_NO_USES_ARP(bond->params.mode)) {
+                pr_info("%s: ARP monitoring cannot be used with ALB/TLB/802.3ad. Only MII monitoring is supported on %s.\n",
+                        bond->dev->name, bond->dev->name);
+                return -EINVAL;
+        }
+        pr_info("%s: Setting ARP monitoring interval to %d.\n",
+                bond->dev->name, arp_interval);
+        bond->params.arp_interval = arp_interval;
+        if (arp_interval) {
+                if (bond->params.miimon) {
+                        pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
+                                bond->dev->name, bond->dev->name);
+                        bond->params.miimon = 0;
+                }
+                if (!bond->params.arp_targets[0])
+                        pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
+                                bond->dev->name);
+        }
+        if (bond->dev->flags & IFF_UP) {
+                /* If the interface is up, we may need to fire off
+                 * the ARP timer.  If the interface is down, the
+                 * timer will get fired off when the open function
+                 * is called.
+                 */
+                if (!arp_interval) {
+                        if (bond->params.arp_validate)
+                                bond->recv_probe = NULL;
+                        cancel_delayed_work_sync(&bond->arp_work);
+                } else {
+                        /* arp_validate can be set only in active-backup mode */
+                        if (bond->params.arp_validate)
+                                bond->recv_probe = bond_arp_rcv;
+                        cancel_delayed_work_sync(&bond->mii_work);
+                        queue_delayed_work(bond->wq, &bond->arp_work, 0);
+                }
+        }
+
+        return 0;
+}
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 114760af9a6d..12128bfa88ce 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -506,60 +506,21 @@ static ssize_t bonding_store_arp_interval(struct device *d,
                                           const char *buf, size_t count)
 {
         struct bonding *bond = to_bond(d);
-        int new_value, ret = count;
+        int new_value, ret;
 
-        if (!rtnl_trylock())
-                return restart_syscall();
         if (sscanf(buf, "%d", &new_value) != 1) {
                 pr_err("%s: no arp_interval value specified.\n",
-                       bond->dev->name);
-                ret = -EINVAL;
-                goto out;
-        }
-        if (new_value < 0) {
-                pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
-                       bond->dev->name, new_value, INT_MAX);
-                ret = -EINVAL;
-                goto out;
-        }
-        if (BOND_NO_USES_ARP(bond->params.mode)) {
-                pr_info("%s: ARP monitoring cannot be used with ALB/TLB/802.3ad. Only MII monitoring is supported on %s.\n",
-                        bond->dev->name, bond->dev->name);
-                ret = -EINVAL;
-                goto out;
-        }
-        pr_info("%s: Setting ARP monitoring interval to %d.\n",
-                bond->dev->name, new_value);
-        bond->params.arp_interval = new_value;
-        if (new_value) {
-                if (bond->params.miimon) {
-                        pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
-                                bond->dev->name, bond->dev->name);
-                        bond->params.miimon = 0;
-                }
-                if (!bond->params.arp_targets[0])
-                        pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
-                                bond->dev->name);
-        }
-        if (bond->dev->flags & IFF_UP) {
-                /* If the interface is up, we may need to fire off
-                 * the ARP timer.  If the interface is down, the
-                 * timer will get fired off when the open function
-                 * is called.
-                 */
-                if (!new_value) {
-                        if (bond->params.arp_validate)
-                                bond->recv_probe = NULL;
-                        cancel_delayed_work_sync(&bond->arp_work);
-                } else {
-                        /* arp_validate can be set only in active-backup mode */
-                        if (bond->params.arp_validate)
-                                bond->recv_probe = bond_arp_rcv;
-                        cancel_delayed_work_sync(&bond->mii_work);
-                        queue_delayed_work(bond->wq, &bond->arp_work, 0);
-                }
+                bond->dev->name);
+                return -EINVAL;
         }
-out:
+
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        ret = bond_option_arp_interval_set(bond, new_value);
+        if (!ret)
+                ret = count;
+
         rtnl_unlock();
         return ret;
 }
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index df159da8db30..44df2738577d 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -443,6 +443,7 @@ int bond_option_miimon_set(struct bonding *bond, int miimon);
 int bond_option_updelay_set(struct bonding *bond, int updelay);
 int bond_option_downdelay_set(struct bonding *bond, int downdelay);
 int bond_option_use_carrier_set(struct bonding *bond, int use_carrier);
+int bond_option_arp_interval_set(struct bonding *bond, int arp_interval);
 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 struct net_device *bond_option_active_slave_get(struct bonding *bond);
 
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 77c41bda36a4..c73d878afd58 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -335,6 +335,7 @@ enum {
         IFLA_BOND_UPDELAY,
         IFLA_BOND_DOWNDELAY,
         IFLA_BOND_USE_CARRIER,
+        IFLA_BOND_ARP_INTERVAL,
         __IFLA_BOND_MAX,
 };