net/bonding: Enable IP multicast for bonding IPoIB devices

Allow to enslave devices when the bonding device is not up. Over the discussion
held at the previous post this seemed to be the most clean way to go, where it
is not expected to cause instabilities.

Normally, the bonding driver is UP before any enslavement takes place.
Once a netdevice is UP, the network stack acts to have it join some multicast groups
(eg the all-hosts 224.0.0.1). Now, since ether_setup() have set the bonding device
type to be ARPHRD_ETHER and address len to be ETHER_ALEN, the net core code
computes a wrong multicast link address. This is b/c ip_eth_mc_map() is called
where for multicast joins taking place after the enslavement another ip_xxx_mc_map()
is called (eg ip_ib_mc_map() when the bond type is ARPHRD_INFINIBAND)

Signed-off-by: Moni Shoua <monis at voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 6508e0b2ea726de486a374d18e9b9cc6ed26f1af..3eebfe287533a2f8a1cb57f8c24be6eee97dbc14 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1280,8 +1280,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 
        /* bond must be initialized by bond_open() before enslaving */
        if (!(bond_dev->flags & IFF_UP)) {
-               dprintk("Error, master_dev is not up\n");
-               return -EPERM;
+               printk(KERN_WARNING DRV_NAME
+                       " %s: master_dev is not up in bond_enslave\n",
+                       bond_dev->name);
        }
 
        /* already enslaved */

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 6f49ca7e9b6686aa9841fe78e61bf3e56c841bb5..ca4e429f9ec2505a2ab4d97314357077f06dcec3 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -266,11 +266,9 @@ static ssize_t bonding_store_slaves(struct device *d,
 
        /* Quick sanity check -- is the bond interface up? */
        if (!(bond->dev->flags & IFF_UP)) {
-               printk(KERN_ERR DRV_NAME
-                      ": %s: Unable to update slaves because interface is down.\n",
+               printk(KERN_WARNING DRV_NAME
+                      ": %s: doing slave updates when interface is down.\n",
                       bond->dev->name);
-               ret = -EPERM;
-               goto out;
        }
 
        /* Note:  We can't hold bond->lock here, as bond_create grabs it. */