net/bonding: Delay sending of gratuitous ARP to avoid failure
Moni Shoua [Wed, 10 Oct 2007 02:43:42 +0000 (19:43 -0700)]
Delay sending a gratuitous_arp when LINK_STATE_LINKWATCH_PENDING bit
in dev->state field is on. This improves the chances for the arp packet to
be transmitted.

Signed-off-by: Moni Shoua <monis at voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/bonding/bond_main.c
drivers/net/bonding/bonding.h

index 7be2336..19fd351 100644 (file)
@@ -1103,8 +1103,14 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
                if (new_active && !bond->do_set_mac_addr)
                        memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
                                new_active->dev->addr_len);
-
-               bond_send_gratuitous_arp(bond);
+               if (bond->curr_active_slave &&
+                       test_bit(__LINK_STATE_LINKWATCH_PENDING,
+                                       &bond->curr_active_slave->dev->state)) {
+                       dprintk("delaying gratuitous arp on %s\n",
+                               bond->curr_active_slave->dev->name);
+                       bond->send_grat_arp = 1;
+               } else
+                       bond_send_gratuitous_arp(bond);
        }
 }
 
@@ -2073,6 +2079,17 @@ void bond_mii_monitor(struct net_device *bond_dev)
         * program could monitor the link itself if needed.
         */
 
+       if (bond->send_grat_arp) {
+               if (bond->curr_active_slave && test_bit(__LINK_STATE_LINKWATCH_PENDING,
+                               &bond->curr_active_slave->dev->state))
+                       dprintk("Needs to send gratuitous arp but not yet\n");
+               else {
+                       dprintk("sending delayed gratuitous arp on on %s\n",
+                               bond->curr_active_slave->dev->name);
+                       bond_send_gratuitous_arp(bond);
+                       bond->send_grat_arp = 0;
+               }
+       }
        read_lock(&bond->curr_slave_lock);
        oldcurrent = bond->curr_active_slave;
        read_unlock(&bond->curr_slave_lock);
@@ -2474,7 +2491,7 @@ static void bond_send_gratuitous_arp(struct bonding *bond)
 
        if (bond->master_ip) {
                bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
-                                 bond->master_ip, 0);
+                               bond->master_ip, 0);
        }
 
        list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
@@ -4280,6 +4297,7 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
        bond->current_arp_slave = NULL;
        bond->primary_slave = NULL;
        bond->dev = bond_dev;
+       bond->send_grat_arp = 0;
        INIT_LIST_HEAD(&bond->vlan_list);
 
        /* Initialize the device entry points */
index ad9c632..e0e06a8 100644 (file)
@@ -187,6 +187,7 @@ struct bonding {
        struct   timer_list arp_timer;
        s8       kill_timers;
        s8       do_set_mac_addr;
+       s8       send_grat_arp;
        struct   net_device_stats stats;
 #ifdef CONFIG_PROC_FS
        struct   proc_dir_entry *proc_entry;