net/bonding: Optionally allow ethernet slaves to keep own MAC

	Update the "don't change MAC of slaves" functionality added in
previous changes to be a generic option, rather than something tied to
IB devices, as it's occasionally useful for regular ethernet devices as
well.

	Adds "fail_over_mac" option (which is automatically enabled for IB
slaves), applicable only to active-backup mode.

	Includes documentation update.

	Updates bonding driver version to 3.2.0.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index b5d2a13fe627..80c0c8c415ed 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -568,6 +568,54 @@ static ssize_t bonding_store_arp_validate(struct device *d,
 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
 
 /*
+ * Show and store fail_over_mac.  User only allowed to change the
+ * value when there are no slaves.
+ */
+static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
+{
+        struct bonding *bond = to_bond(d);
+
+        return sprintf(buf, "%d\n", bond->params.fail_over_mac) + 1;
+}
+
+static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
+{
+        int new_value;
+        int ret = count;
+        struct bonding *bond = to_bond(d);
+
+        if (bond->slave_cnt != 0) {
+                printk(KERN_ERR DRV_NAME
+                       ": %s: Can't alter fail_over_mac with slaves in bond.\n",
+                       bond->dev->name);
+                ret = -EPERM;
+                goto out;
+        }
+
+        if (sscanf(buf, "%d", &new_value) != 1) {
+                printk(KERN_ERR DRV_NAME
+                       ": %s: no fail_over_mac value specified.\n",
+                       bond->dev->name);
+                ret = -EINVAL;
+                goto out;
+        }
+
+        if ((new_value == 0) || (new_value == 1)) {
+                bond->params.fail_over_mac = new_value;
+                printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %d.\n",
+                       bond->dev->name, new_value);
+        } else {
+                printk(KERN_INFO DRV_NAME
+                       ": %s: Ignoring invalid fail_over_mac value %d.\n",
+                       bond->dev->name, new_value);
+        }
+out:
+        return ret;
+}
+
+static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
+
+/*
  * Show and set the arp timer interval.  There are two tricky bits
  * here.  First, if ARP monitoring is activated, then we must disable
  * MII monitoring.  Second, if the ARP timer isn't running, we must
@@ -1388,6 +1436,7 @@ static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
 static struct attribute *per_bond_attrs[] = {
         &dev_attr_slaves.attr,
         &dev_attr_mode.attr,
+        &dev_attr_fail_over_mac.attr,
         &dev_attr_arp_validate.attr,
         &dev_attr_arp_interval.attr,
         &dev_attr_arp_ip_target.attr,