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>

1 files changed, 47 insertions, 0 deletions

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;
+}