bonding: Make alb learning packet interval configurable

running bonding in ALB mode requires that learning packets be sent periodically,
so that the switch knows where to send responding traffic.  However, depending
on switch configuration, there may not be any need to send traffic at the
default rate of 3 packets per second, which represents little more than wasted
data.  Allow the ALB learning packet interval to be made configurable via sysfs

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Acked-by: Veaceslav Falico <vfalico@redhat.com>
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 53 insertions, 5 deletions

diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index 87bbcfee2e06..9b28e714831a 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -1362,6 +1362,12 @@ To add ARP targets:
 To remove an ARP target:
 # echo -192.168.0.100 > /sys/class/net/bond0/bonding/arp_ip_target
 
+To configure the interval between learning packet transmits:
+# echo 12 > /sys/class/net/bond0/bonding/lp_interval
+	NOTE: the lp_inteval is the number of seconds between instances where
+the bonding driver sends learning packets to each slaves peer switch.  The
+default interval is 1 second.
+
 Example Configuration
 ---------------------
 	We begin with the same example that is shown in section 3.3,
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 91f179d5135c..f428ef574372 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1472,7 +1472,7 @@ void bond_alb_monitor(struct work_struct *work)
 	bond_info->lp_counter++;
 
 	/* send learning packets */
-	if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
+	if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
 		/* change of curr_active_slave involves swapping of mac addresses.
 		 * in order to avoid this swapping from happening while
 		 * sending the learning packets, the curr_slave_lock must be held for
diff --git a/drivers/net/bonding/bond_alb.h b/drivers/net/bonding/bond_alb.h
index 28d8e4c7dc06..c5eff5dafdfe 100644
--- a/drivers/net/bonding/bond_alb.h
+++ b/drivers/net/bonding/bond_alb.h
@@ -36,14 +36,15 @@ struct slave;
 					 * Used for division - never set
 					 * to zero !!!
 					 */
-#define BOND_ALB_LP_INTERVAL	    1	/* In seconds, periodic send of
-					 * learning packets to the switch
-					 */
+#define BOND_ALB_DEFAULT_LP_INTERVAL 1
+#define BOND_ALB_LP_INTERVAL(bond) (bond->params.lp_interval)	/* In seconds, periodic send of
+								 * learning packets to the switch
+								 */
 
 #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
 				  * ALB_TIMER_TICKS_PER_SEC)
 
-#define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
+#define BOND_ALB_LP_TICKS(bond) (BOND_ALB_LP_INTERVAL(bond) \
 			   * ALB_TIMER_TICKS_PER_SEC)
 
 #define TLB_HASH_TABLE_SIZE 256	/* The size of the clients hash table.
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 72df399c4ab3..55bbb8b8200c 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4416,6 +4416,7 @@ static int bond_check_params(struct bond_params *params)
 	params->all_slaves_active = all_slaves_active;
 	params->resend_igmp = resend_igmp;
 	params->min_links = min_links;
+	params->lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 
 	if (primary) {
 		strncpy(params->primary, primary, IFNAMSIZ);
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index eeab40b01b7a..c29b836749b6 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1699,6 +1699,44 @@ out:
 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
 		   bonding_show_resend_igmp, bonding_store_resend_igmp);
 
+
+static ssize_t bonding_show_lp_interval(struct device *d,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct bonding *bond = to_bond(d);
+	return sprintf(buf, "%d\n", bond->params.lp_interval);
+}
+
+static ssize_t bonding_store_lp_interval(struct device *d,
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
+{
+	struct bonding *bond = to_bond(d);
+	int new_value, ret = count;
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		pr_err("%s: no lp interval value specified.\n",
+			bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (new_value <= 0) {
+		pr_err ("%s: lp_interval must be between 1 and %d\n",
+			bond->dev->name, INT_MAX);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	bond->params.lp_interval = new_value;
+out:
+	return ret;
+}
+
+static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
+		   bonding_show_lp_interval, bonding_store_lp_interval);
+
 static struct attribute *per_bond_attrs[] = {
 	&dev_attr_slaves.attr,
 	&dev_attr_mode.attr,
@@ -1729,6 +1767,7 @@ static struct attribute *per_bond_attrs[] = {
 	&dev_attr_all_slaves_active.attr,
 	&dev_attr_resend_igmp.attr,
 	&dev_attr_min_links.attr,
+	&dev_attr_lp_interval.attr,
 	NULL,
 };
 
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 7ad8bd5cc947..03cf3fd14490 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -176,6 +176,7 @@ struct bond_params {
 	int tx_queues;
 	int all_slaves_active;
 	int resend_igmp;
+	int lp_interval;
 };
 
 struct bond_parm_tbl {