net/mlx4_core: Don't give VFs MAC addresses which are derived from the PF MAC

[ Upstream commit 0508ad64 ]

If the user has not assigned a MAC address to a VM, then don't give it MAC which
is based on the PF one. The current derivation scheme is wrong and leads to VM
MAC collisions when the number of cards/hypervisors becomes big enough.

Instead, just give it zeros and let them figure out what to do with that.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/mellanox/mlx4/fw.c

@@ -840,16 +840,7 @@ int mlx4_QUERY_PORT_wrapper(struct mlx4_dev *dev, int slave,
 			   MLX4_CMD_NATIVE);
 
 	if (!err && dev->caps.function != slave) {
-		/* if config MAC in DB use it */
-		if (priv->mfunc.master.vf_oper[slave].vport[vhcr->in_modifier].state.mac)
-			def_mac = priv->mfunc.master.vf_oper[slave].vport[vhcr->in_modifier].state.mac;
-		else {
-			/* set slave default_mac address */
-			MLX4_GET(def_mac, outbox->buf, QUERY_PORT_MAC_OFFSET);
-			def_mac += slave << 8;
-			priv->mfunc.master.vf_admin[slave].vport[vhcr->in_modifier].mac = def_mac;
-		}
-
+		def_mac = priv->mfunc.master.vf_oper[slave].vport[vhcr->in_modifier].state.mac;
 		MLX4_PUT(outbox->buf, def_mac, QUERY_PORT_MAC_OFFSET);
 
 		/* get port type - currently only eth is enabled */