net/mlx5e: Add txq to sq stats mapping

mlx5 currently maps txqs to an sq via priv->txq2sq. It is useful to map
txqs to sq_stats, as well, for direct access to stats.

Add priv->txq2sq_stats and insert mappings. The mappings will be used
next to tabulate stats information.
Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -867,6 +867,8 @@ struct mlx5e_priv {
 	/* priv data path fields - start */
 	struct mlx5e_selq selq;
 	struct mlx5e_txqsq **txq2sq;
+	struct mlx5e_sq_stats **txq2sq_stats;
+
 #ifdef CONFIG_MLX5_CORE_EN_DCB
 	struct mlx5e_dcbx_dp       dcbx_dp;
 #endif

drivers/net/ethernet/mellanox/mlx5/core/en/qos.c

@@ -170,6 +170,7 @@ int mlx5e_activate_qos_sq(void *data, u16 node_qid, u32 hw_id)
 	mlx5e_tx_disable_queue(netdev_get_tx_queue(priv->netdev, qid));
 
 	priv->txq2sq[qid] = sq;
+	priv->txq2sq_stats[qid] = sq->stats;
 
 	/* Make the change to txq2sq visible before the queue is started.
 	 * As mlx5e_xmit runs under a spinlock, there is an implicit ACQUIRE,
@@ -186,6 +187,7 @@ int mlx5e_activate_qos_sq(void *data, u16 node_qid, u32 hw_id)
 void mlx5e_deactivate_qos_sq(struct mlx5e_priv *priv, u16 qid)
 {
 	struct mlx5e_txqsq *sq;
+	u16 txq_ix;
 
 	sq = mlx5e_get_qos_sq(priv, qid);
 	if (!sq) /* Handle the case when the SQ failed to open. */
@@ -194,7 +196,10 @@ void mlx5e_deactivate_qos_sq(struct mlx5e_priv *priv, u16 qid)
 	qos_dbg(sq->mdev, "Deactivate QoS SQ qid %u\n", qid);
 	mlx5e_deactivate_txqsq(sq);
 
-	priv->txq2sq[mlx5e_qid_from_qos(&priv->channels, qid)] = NULL;
+	txq_ix = mlx5e_qid_from_qos(&priv->channels, qid);
+
+	priv->txq2sq[txq_ix] = NULL;
+	priv->txq2sq_stats[txq_ix] = NULL;
 
 	/* Make the change to txq2sq visible before the queue is started again.
 	 * As mlx5e_xmit runs under a spinlock, there is an implicit ACQUIRE,
@@ -325,6 +330,7 @@ void mlx5e_qos_deactivate_queues(struct mlx5e_channel *c)
 {
 	struct mlx5e_params *params = &c->priv->channels.params;
 	struct mlx5e_txqsq __rcu **qos_sqs;
+	u16 txq_ix;
 	int i;
 
 	qos_sqs = mlx5e_state_dereference(c->priv, c->qos_sqs);
@@ -342,8 +348,11 @@ void mlx5e_qos_deactivate_queues(struct mlx5e_channel *c)
 		qos_dbg(c->mdev, "Deactivate QoS SQ qid %u\n", qid);
 		mlx5e_deactivate_txqsq(sq);
 
+		txq_ix = mlx5e_qid_from_qos(&c->priv->channels, qid);
+
 		/* The queue is disabled, no synchronization with datapath is needed. */
-		c->priv->txq2sq[mlx5e_qid_from_qos(&c->priv->channels, qid)] = NULL;
+		c->priv->txq2sq[txq_ix] = NULL;
+		c->priv->txq2sq_stats[txq_ix] = NULL;
 	}
 }
 

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -3125,6 +3125,7 @@ static void mlx5e_build_txq_maps(struct mlx5e_priv *priv)
 			struct mlx5e_txqsq *sq = &c->sq[tc];
 
 			priv->txq2sq[sq->txq_ix] = sq;
+			priv->txq2sq_stats[sq->txq_ix] = sq->stats;
 		}
 	}
 
@@ -3139,6 +3140,7 @@ static void mlx5e_build_txq_maps(struct mlx5e_priv *priv)
 		struct mlx5e_txqsq *sq = &c->ptpsq[tc].txqsq;
 
 		priv->txq2sq[sq->txq_ix] = sq;
+		priv->txq2sq_stats[sq->txq_ix] = sq->stats;
 	}
 
 out:
@@ -5848,9 +5850,13 @@ int mlx5e_priv_init(struct mlx5e_priv *priv,
 	if (!priv->txq2sq)
 		goto err_destroy_workqueue;
 
+	priv->txq2sq_stats = kcalloc_node(num_txqs, sizeof(*priv->txq2sq_stats), GFP_KERNEL, node);
+	if (!priv->txq2sq_stats)
+		goto err_free_txq2sq;
+
 	priv->tx_rates = kcalloc_node(num_txqs, sizeof(*priv->tx_rates), GFP_KERNEL, node);
 	if (!priv->tx_rates)
-		goto err_free_txq2sq;
+		goto err_free_txq2sq_stats;
 
 	priv->channel_stats =
 		kcalloc_node(nch, sizeof(*priv->channel_stats), GFP_KERNEL, node);
@@ -5861,6 +5867,8 @@ int mlx5e_priv_init(struct mlx5e_priv *priv,
 
 err_free_tx_rates:
 	kfree(priv->tx_rates);
+err_free_txq2sq_stats:
+	kfree(priv->txq2sq_stats);
 err_free_txq2sq:
 	kfree(priv->txq2sq);
 err_destroy_workqueue:
@@ -5884,6 +5892,7 @@ void mlx5e_priv_cleanup(struct mlx5e_priv *priv)
 		kvfree(priv->channel_stats[i]);
 	kfree(priv->channel_stats);
 	kfree(priv->tx_rates);
+	kfree(priv->txq2sq_stats);
 	kfree(priv->txq2sq);
 	destroy_workqueue(priv->wq);
 	mlx5e_selq_cleanup(&priv->selq);