diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index a0313de122de..83afb1541a74 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1477,6 +1477,17 @@ static int mlx4_setup_hca(struct mlx4_dev *dev)
 					  "with caps = 0\n", port, err);
 			dev->caps.ib_port_def_cap[port] = ib_port_default_caps;
 
+			/* initialize per-slave default ib port capabilities */
+			if (mlx4_is_master(dev)) {
+				int i;
+				for (i = 0; i < dev->num_slaves; i++) {
+					if (i == mlx4_master_func_num(dev))
+						continue;
+					priv->mfunc.master.slave_state[i].ib_cap_mask[port] =
+							ib_port_default_caps;
+				}
+			}
+
 			if (mlx4_is_mfunc(dev))
 				dev->caps.port_ib_mtu[port] = IB_MTU_2048;
 			else
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 560b2201519f..7fbdc89de495 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -633,6 +633,11 @@ struct mlx4_init_port_param {
 
 void handle_port_mgmt_change_event(struct work_struct *work);
 
+static inline int mlx4_master_func_num(struct mlx4_dev *dev)
+{
+	return dev->caps.function;
+}
+
 static inline int mlx4_is_master(struct mlx4_dev *dev)
 {
 	return dev->flags & MLX4_FLAG_MASTER;