IB/mlx4: Use flow counters on IBoE ports

Allocate flow counter per Ethernet/IBoE port, and attach this counter
to all the QPs created on that port.  Based on patch by Eli Cohen
<eli@mellanox.co.il>.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/mlx4/main.c

@@ -1098,11 +1098,21 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 	if (init_node_data(ibdev))
 		goto err_map;
 
+	for (i = 0; i < ibdev->num_ports; ++i) {
+		if (mlx4_ib_port_link_layer(&ibdev->ib_dev, i + 1) ==
+						IB_LINK_LAYER_ETHERNET) {
+			err = mlx4_counter_alloc(ibdev->dev, &ibdev->counters[i]);
+			if (err)
+				ibdev->counters[i] = -1;
+		} else
+				ibdev->counters[i] = -1;
+	}
+
 	spin_lock_init(&ibdev->sm_lock);
 	mutex_init(&ibdev->cap_mask_mutex);
 
 	if (ib_register_device(&ibdev->ib_dev, NULL))
-		goto err_map;
+		goto err_counter;
 
 	if (mlx4_ib_mad_init(ibdev))
 		goto err_reg;
@@ -1132,6 +1142,10 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 err_reg:
 	ib_unregister_device(&ibdev->ib_dev);
 
+err_counter:
+	for (; i; --i)
+		mlx4_counter_free(ibdev->dev, ibdev->counters[i - 1]);
+
 err_map:
 	iounmap(ibdev->uar_map);
 
@@ -1160,7 +1174,8 @@ static void mlx4_ib_remove(struct mlx4_dev *dev, void *ibdev_ptr)
 		ibdev->iboe.nb.notifier_call = NULL;
 	}
 	iounmap(ibdev->uar_map);
-
+	for (p = 0; p < ibdev->num_ports; ++p)
+		mlx4_counter_free(ibdev->dev, ibdev->counters[p]);
 	mlx4_foreach_port(p, dev, MLX4_PORT_TYPE_IB)
 		mlx4_CLOSE_PORT(dev, p);
 

drivers/infiniband/hw/mlx4/mlx4_ib.h

@@ -193,6 +193,7 @@ struct mlx4_ib_dev {
 	struct mutex		cap_mask_mutex;
 	bool			ib_active;
 	struct mlx4_ib_iboe	iboe;
+	int			counters[MLX4_MAX_PORTS];
 };
 
 static inline struct mlx4_ib_dev *to_mdev(struct ib_device *ibdev)

drivers/infiniband/hw/mlx4/qp.c

@@ -893,7 +893,6 @@ static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
 			--path->static_rate;
 	} else
 		path->static_rate = 0;
-	path->counter_index = 0xff;
 
 	if (ah->ah_flags & IB_AH_GRH) {
 		if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
@@ -1034,6 +1033,15 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
 		}
 	}
 
+	if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
+		if (dev->counters[qp->port - 1] != -1) {
+			context->pri_path.counter_index =
+						dev->counters[qp->port - 1];
+			optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX;
+		} else
+			context->pri_path.counter_index = 0xff;
+	}
+
 	if (attr_mask & IB_QP_PKEY_INDEX) {
 		context->pri_path.pkey_index = attr->pkey_index;
 		optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;

include/linux/mlx4/qp.h

@@ -54,7 +54,8 @@ enum mlx4_qp_optpar {
 	MLX4_QP_OPTPAR_RETRY_COUNT		= 1 << 12,
 	MLX4_QP_OPTPAR_RNR_RETRY		= 1 << 13,
 	MLX4_QP_OPTPAR_ACK_TIMEOUT		= 1 << 14,
-	MLX4_QP_OPTPAR_SCHED_QUEUE		= 1 << 16
+	MLX4_QP_OPTPAR_SCHED_QUEUE		= 1 << 16,
+	MLX4_QP_OPTPAR_COUNTER_INDEX		= 1 << 20
 };
 
 enum mlx4_qp_state {