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>

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:

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;
+}

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);
-		}
+		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;
 }

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);
 

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,
 };