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net/bonding: correctly proxy slave neigh param setup ndo function
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The current implemenation was buggy for slaves who use ndo_neigh_setup,
since the networking stack invokes the bonding device ndo entry (from
neigh_params_alloc) before any devices are enslaved, and the bonding
driver can't further delegate the call at that point in time. As a
result when bonding IPoIB devices, the neigh_cleanup hasn't been called.

Fix that by deferring the actual call into the slave ndo_neigh_setup
from the time the bonding neigh_setup is called.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Shlomo Pongratz authored and David S. Miller committed Apr 4, 2012
1 parent 2af73d4 commit 234bcf8
Showing 1 changed file with 43 additions and 8 deletions.
51 changes: 43 additions & 8 deletions drivers/net/bonding/bond_main.c
Original file line number Diff line number Diff line change
Expand Up @@ -3704,17 +3704,52 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
read_unlock(&bond->lock);
}

static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
static int bond_neigh_init(struct neighbour *n)
{
struct bonding *bond = netdev_priv(dev);
struct bonding *bond = netdev_priv(n->dev);
struct slave *slave = bond->first_slave;
const struct net_device_ops *slave_ops;
struct neigh_parms parms;
int ret;

if (!slave)
return 0;

slave_ops = slave->dev->netdev_ops;

if (!slave_ops->ndo_neigh_setup)
return 0;

parms.neigh_setup = NULL;
parms.neigh_cleanup = NULL;
ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
if (ret)
return ret;

/*
* Assign slave's neigh_cleanup to neighbour in case cleanup is called
* after the last slave has been detached. Assumes that all slaves
* utilize the same neigh_cleanup (true at this writing as only user
* is ipoib).
*/
n->parms->neigh_cleanup = parms.neigh_cleanup;

if (!parms.neigh_setup)
return 0;

return parms.neigh_setup(n);
}

/*
* The bonding ndo_neigh_setup is called at init time beofre any
* slave exists. So we must declare proxy setup function which will
* be used at run time to resolve the actual slave neigh param setup.
*/
static int bond_neigh_setup(struct net_device *dev,
struct neigh_parms *parms)
{
parms->neigh_setup = bond_neigh_init;

if (slave) {
const struct net_device_ops *slave_ops
= slave->dev->netdev_ops;
if (slave_ops->ndo_neigh_setup)
return slave_ops->ndo_neigh_setup(slave->dev, parms);
}
return 0;
}

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