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bonding: Send more than one gratuitous ARP when slave takes over

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With IPoIB, reception of gratuitous ARP by neighboring hosts
is essential for a successful change of slaves in case of failure.
Otherwise, they won't learn about the HW address change and need
to wait a long time until the neighboring system gives up and sends
an ARP request to learn the new HW address.  This patch decreases
the chance for a lost of a gratuitous ARP packet by sending it more
than once. The number retries is configurable and can be set with a
module param.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Moni Shoua 2008-05-17 21:10:12 -07:00 committed by Jeff Garzik
parent 8047637c70
commit 7893b2491a
3 changed files with 60 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/bonding/bond_main.c
View File

@ -88,6 +88,7 @@
#define BOND_LINK_ARP_INTERV 0
static int max_bonds = BOND_DEFAULT_MAX_BONDS;
static int num_grat_arp = 1;
static int miimon = BOND_LINK_MON_INTERV;
static int updelay = 0;
static int downdelay = 0;
@ -104,6 +105,8 @@ struct bond_params bonding_defaults;
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
@ -1109,14 +1112,18 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
if (new_active && bond->params.fail_over_mac)
memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
new_active->dev->addr_len);
bond->send_grat_arp = bond->params.num_grat_arp;
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
} else {
if (bond->send_grat_arp > 0) {
bond_send_gratuitous_arp(bond);
bond->send_grat_arp--;
}
}
}
}
@ -2144,7 +2151,7 @@ static int __bond_mii_monitor(struct bonding *bond, int have_locks)
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;
bond->send_grat_arp--;
}
}
read_lock(&bond->curr_slave_lock);
@ -4626,6 +4633,13 @@ static int bond_check_params(struct bond_params *params)
use_carrier = 1;
}
if (num_grat_arp < 0 || num_grat_arp > 255) {
printk(KERN_WARNING DRV_NAME
": Warning: num_grat_arp (%d) not in range 0-255 so it "
"was reset to 1 \n", num_grat_arp);
num_grat_arp = 1;
}
/* reset values for 802.3ad */
if (bond_mode == BOND_MODE_8023AD) {
if (!miimon) {
@ -4813,6 +4827,7 @@ static int bond_check_params(struct bond_params *params)
params->mode = bond_mode;
params->xmit_policy = xmit_hashtype;
params->miimon = miimon;
params->num_grat_arp = num_grat_arp;
params->arp_interval = arp_interval;
params->arp_validate = arp_validate_value;
params->updelay = updelay;

40
drivers/net/bonding/bond_sysfs.c
View File

@ -950,6 +950,45 @@ out:
}
static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
/*
* Show and set the number of grat ARP to send after a failover event.
*/
static ssize_t bonding_show_n_grat_arp(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.num_grat_arp);
}
static ssize_t bonding_store_n_grat_arp(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no num_grat_arp value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0 || new_value > 255) {
printk(KERN_ERR DRV_NAME
": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
bond->dev->name, new_value);
ret = -EINVAL;
goto out;
} else {
bond->params.num_grat_arp = new_value;
}
out:
return ret;
}
static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR, bonding_show_n_grat_arp, bonding_store_n_grat_arp);
/*
* Show and set the MII monitor interval. There are two tricky bits
* here. First, if MII monitoring is activated, then we must disable
@ -1387,6 +1426,7 @@ static struct attribute *per_bond_attrs[] = {
&dev_attr_updelay.attr,
&dev_attr_lacp_rate.attr,
&dev_attr_xmit_hash_policy.attr,
&dev_attr_num_grat_arp.attr,
&dev_attr_miimon.attr,
&dev_attr_primary.attr,
&dev_attr_use_carrier.attr,

1
drivers/net/bonding/bonding.h
View File

@ -125,6 +125,7 @@ struct bond_params {
int mode;
int xmit_policy;
int miimon;
int num_grat_arp;
int arp_interval;
int arp_validate;
int use_carrier;