From b59f9f74c4c0a569398f08c34a877f1b7b457496 Mon Sep 17 00:00:00 2001 From: Jay Vosburgh Date: Fri, 13 Jun 2008 18:12:03 -0700 Subject: [PATCH] bonding: Rework / fix multiple gratuitous ARP support Support for sending multiple gratuitous ARPs during failovers was added by commit: commit 7893b2491a2d5f716540ac5643d78d37a7f6628b Author: Moni Shoua Date: Sat May 17 21:10:12 2008 -0700 bonding: Send more than one gratuitous ARP when slave takes over This change modifies that support to remove duplicated code, add support for ARP monitor (the original only supported miimon), clear the grat ARP counter in bond_close (lest a later "ifconfig up" immediately start spewing ARPs), and add documentation for the module parameter. Also updated driver version to 3.3.0. Signed-off-by: Jay Vosburgh Signed-off-by: Jeff Garzik --- Documentation/networking/bonding.txt | 11 ++++++++ drivers/net/bonding/bond_main.c | 42 +++++++++++++++------------- drivers/net/bonding/bonding.h | 4 +-- 3 files changed, 35 insertions(+), 22 deletions(-) diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt index 8e6b8d3c74..370b7da73a 100644 --- a/Documentation/networking/bonding.txt +++ b/Documentation/networking/bonding.txt @@ -539,6 +539,17 @@ mode swapped with the new curr_active_slave that was chosen. +num_grat_arp + + Specifies the number of gratuitous ARPs to be issued after a + failover event. One gratuitous ARP is issued immediately after + the failover, subsequent ARPs are sent at a rate of one per link + monitor interval (arp_interval or miimon, whichever is active). + + The valid range is 0 - 255; the default value is 1. This option + affects only the active-backup mode. This option was added for + bonding version 3.3.0. + primary A string (eth0, eth2, etc) specifying which slave is the diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 925402bcdf..3b6d66a8ab 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1195,14 +1195,7 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active) old_active); bond->send_grat_arp = bond->params.num_grat_arp; - if (!test_bit(__LINK_STATE_LINKWATCH_PENDING, - &bond->curr_active_slave->dev->state)) { - bond_send_gratuitous_arp(bond); - bond->send_grat_arp--; - } else { - dprintk("delaying gratuitous arp on %s\n", - bond->curr_active_slave->dev->name); - } + bond_send_gratuitous_arp(bond); write_unlock_bh(&bond->curr_slave_lock); read_unlock(&bond->lock); @@ -2241,17 +2234,6 @@ static int __bond_mii_monitor(struct bonding *bond, int have_locks) * 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--; - } - } read_lock(&bond->curr_slave_lock); oldcurrent = bond->curr_active_slave; read_unlock(&bond->curr_slave_lock); @@ -2492,6 +2474,13 @@ void bond_mii_monitor(struct work_struct *work) read_unlock(&bond->lock); return; } + + if (bond->send_grat_arp) { + read_lock(&bond->curr_slave_lock); + bond_send_gratuitous_arp(bond); + read_unlock(&bond->curr_slave_lock); + } + if (__bond_mii_monitor(bond, 0)) { read_unlock(&bond->lock); rtnl_lock(); @@ -2657,6 +2646,8 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave) /* * Kick out a gratuitous ARP for an IP on the bonding master plus one * for each VLAN above us. + * + * Caller must hold curr_slave_lock for read or better */ static void bond_send_gratuitous_arp(struct bonding *bond) { @@ -2666,9 +2657,13 @@ static void bond_send_gratuitous_arp(struct bonding *bond) dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name, slave ? slave->dev->name : "NULL"); - if (!slave) + + if (!slave || !bond->send_grat_arp || + test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) return; + bond->send_grat_arp--; + if (bond->master_ip) { bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip, bond->master_ip, 0); @@ -3172,6 +3167,12 @@ void bond_activebackup_arp_mon(struct work_struct *work) if (bond->slave_cnt == 0) goto re_arm; + if (bond->send_grat_arp) { + read_lock(&bond->curr_slave_lock); + bond_send_gratuitous_arp(bond); + read_unlock(&bond->curr_slave_lock); + } + if (bond_ab_arp_inspect(bond, delta_in_ticks)) { read_unlock(&bond->lock); rtnl_lock(); @@ -3846,6 +3847,7 @@ static int bond_close(struct net_device *bond_dev) write_lock_bh(&bond->lock); + bond->send_grat_arp = 0; /* signal timers not to re-arm */ bond->kill_timers = 1; diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index 89fd9963db..fb730ec039 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -22,8 +22,8 @@ #include "bond_3ad.h" #include "bond_alb.h" -#define DRV_VERSION "3.2.5" -#define DRV_RELDATE "March 21, 2008" +#define DRV_VERSION "3.3.0" +#define DRV_RELDATE "June 10, 2008" #define DRV_NAME "bonding" #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver" -- 2.39.5