On Thu, Jul 21, 2016 at 11:52:55AM +0300, Saeed Mahameed wrote:
> From: Mark Bloch <ma...@mellanox.com>
>
> When using an IPoIB bond currently only active-backup mode is a valid
> use case and this commit strengthens it.
>
> Since commit 2ab82852a270 ("net/bonding: Enable bonding to enslave
> netdevices not supporting set_mac_address()") was introduced till
> 4.7-rc1, IPoIB didn't support the set_mac_address ndo, and hence the
> fail over mac policy always applied to IPoIB bonds.
>
> With the introduction of commit 492a7e67ff83 ("IB/IPoIB: Allow setting
> the device address"), that doesn't hold and practically IPoIB bonds are
> broken as of that. To fix it, lets go to fail over mac if the device
> doesn't support the ndo OR this is IPoIB device.
>
> As a by-product, this commit also prevents a stack corruption which
> occurred when trying to copy 20 bytes (IPoIB) device address
> to a sockaddr struct that has only 16 bytes of storage.
>
> Signed-off-by: Mark Bloch <ma...@mellanox.com>
> Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
> Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Acked-by: Andy Gospodarek <go...@cumulusnetworks.com>
> ---
>
> Changes from v0:
> - Set res to -EOPNOTSUPP before jumping to err_undo_flags.
>
> drivers/net/bonding/bond_main.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index a2afa3b..4d79819 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1422,7 +1422,16 @@ int bond_enslave(struct net_device *bond_dev, struct
> net_device *slave_dev)
> return -EINVAL;
> }
>
> - if (slave_ops->ndo_set_mac_address == NULL) {
> + if (slave_dev->type == ARPHRD_INFINIBAND &&
> + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
> + netdev_warn(bond_dev, "Type (%d) supports only active-backup
> mode\n",
> + slave_dev->type);
> + res = -EOPNOTSUPP;
> + goto err_undo_flags;
> + }
> +
> + if (!slave_ops->ndo_set_mac_address ||
> + slave_dev->type == ARPHRD_INFINIBAND) {
> netdev_warn(bond_dev, "The slave device specified does not
> support setting the MAC address\n");
> if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
> bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
> --
> 2.8.0
>
