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Date: Wed, 22 Jun 2011 12:54:39 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: Flavio Leitner <fbl@...hat.com>
Cc: Jay Vosburgh <fubar@...ibm.com>,
Andy Gospodarek <andy@...yhouse.net>,
David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bonding: add min links parameter to 802.3ad
This adds support for a configuring the minimum number of links that
must be active before asserting carrier. It is similar to the Cisco
EtherChannel min-links feature. This allows setting the minimum number
of member ports that must be up (link-up state) before marking the
bond device as up (carrier on). This is useful for situations where
higher level services such as clustering want to ensure a minimum
number of low bandwidth links are active before switchover.
See:
http://bugzilla.vyatta.com/show_bug.cgi?id=7196
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
---
v2 - need to transition to carrier_off if insufficient number of links
and whitespace cleanup
drivers/net/bonding/bond_3ad.c | 8 ++++++--
drivers/net/bonding/bond_main.c | 5 +++++
drivers/net/bonding/bond_procfs.c | 1 +
drivers/net/bonding/bond_sysfs.c | 35 +++++++++++++++++++++++++++++++++++
drivers/net/bonding/bonding.h | 1 +
5 files changed, 48 insertions(+), 2 deletions(-)
--- a/drivers/net/bonding/bond_main.c 2011-06-22 09:06:40.895998636 -0700
+++ b/drivers/net/bonding/bond_main.c 2011-06-22 10:11:52.855974841 -0700
@@ -98,6 +98,7 @@ static char *mode;
static char *primary;
static char *primary_reselect;
static char *lacp_rate;
+static int min_links;
static char *ad_select;
static char *xmit_hash_policy;
static int arp_interval = BOND_LINK_ARP_INTERV;
@@ -150,6 +151,9 @@ module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
"0 for stable (default), 1 for bandwidth, "
"2 for count");
+module_param(min_links, int, 0);
+MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
+
module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
"0 for layer 2 (default), 1 for layer 3+4, "
@@ -4798,6 +4802,7 @@ static int bond_check_params(struct bond
params->tx_queues = tx_queues;
params->all_slaves_active = all_slaves_active;
params->resend_igmp = resend_igmp;
+ params->min_links = min_links;
if (primary) {
strncpy(params->primary, primary, IFNAMSIZ);
--- a/drivers/net/bonding/bond_procfs.c 2011-06-22 09:17:04.391998454 -0700
+++ b/drivers/net/bonding/bond_procfs.c 2011-06-22 09:27:09.815997950 -0700
@@ -125,6 +125,7 @@ static void bond_info_show_master(struct
seq_puts(seq, "\n802.3ad info\n");
seq_printf(seq, "LACP rate: %s\n",
(bond->params.lacp_fast) ? "fast" : "slow");
+ seq_printf(seq, "Min links: %d\n", bond->params.min_links);
seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
ad_select_tbl[bond->params.ad_select].modename);
--- a/drivers/net/bonding/bond_sysfs.c 2011-06-22 09:04:50.295998865 -0700
+++ b/drivers/net/bonding/bond_sysfs.c 2011-06-22 12:46:57.123624800 -0700
@@ -819,6 +819,38 @@ out:
static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
bonding_show_lacp, bonding_store_lacp);
+static ssize_t bonding_show_min_links(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct bonding *bond = to_bond(d);
+
+ return sprintf(buf, "%d\n", bond->params.min_links);
+}
+
+static ssize_t bonding_store_min_links(struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct bonding *bond = to_bond(d);
+ int ret;
+ unsigned int new_value;
+
+ ret = kstrtouint(buf, 0, &new_value);
+ if (ret < 0) {
+ pr_err("%s: Ignoring invalid min links value %s.\n",
+ bond->dev->name, buf);
+ return ret;
+ }
+
+ pr_info("%s: Setting min links value to %u\n",
+ bond->dev->name, new_value);
+ bond->params.min_links = new_value;
+ return count;
+}
+static DEVICE_ATTR(min_links, S_IRUGO | S_IWUSR,
+ bonding_show_min_links, bonding_store_min_links);
+
static ssize_t bonding_show_ad_select(struct device *d,
struct device_attribute *attr,
char *buf)
@@ -1601,6 +1633,7 @@ static struct attribute *per_bond_attrs[
&dev_attr_queue_id.attr,
&dev_attr_all_slaves_active.attr,
&dev_attr_resend_igmp.attr,
+ &dev_attr_min_links.attr,
NULL,
};
--- a/drivers/net/bonding/bonding.h 2011-06-22 09:05:32.351998841 -0700
+++ b/drivers/net/bonding/bonding.h 2011-06-22 09:27:23.959999290 -0700
@@ -147,6 +147,7 @@ struct bond_params {
int updelay;
int downdelay;
int lacp_fast;
+ unsigned int min_links;
int ad_select;
char primary[IFNAMSIZ];
int primary_reselect;
--- a/drivers/net/bonding/bond_3ad.c 2011-06-22 08:43:25.599999586 -0700
+++ b/drivers/net/bonding/bond_3ad.c 2011-06-22 12:51:43.431614028 -0700
@@ -2342,8 +2342,17 @@ void bond_3ad_handle_link_change(struct
*/
int bond_3ad_set_carrier(struct bonding *bond)
{
- if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
- if (!netif_carrier_ok(bond->dev)) {
+ struct aggregator *active;
+
+ active = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
+ if (active) {
+ /* are enough slaves available to consider link up? */
+ if (active->num_of_ports < bond->params.min_links) {
+ if (netif_carrier_ok(bond->dev)) {
+ netif_carrier_off(bond->dev);
+ return 1;
+ }
+ } else if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
return 1;
}
--
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