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>

1 files changed, 39 insertions, 0 deletions

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,
 };