[dpdk-dev] [PATCH 3/4] net/mlx5: conditional hairpin auto bind

[Bing Zhao <bingz@nvidia.com>]

In single port hairpin mode, after the queues are configured during
start up. The binding process will be enabled automatically in the
port start phase and the default control flow for egress will be
created.

When switching to two ports hairpin mode, the auto binding process
should be skipped if there is no TX queue with the peer RX queue on
the same device, and it should be skipped also if the queues are
configured with manual bind attribute.

If the explicit TX flow rule mode is configured or hairpin is
between two ports, the default control flows for TX queues should
not be created.

Signed-off-by: Bing Zhao <bingz@nvidia.com>
---
 drivers/net/mlx5/mlx5_trigger.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index f326b57..77d84dd 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -214,6 +214,8 @@
 	struct mlx5_devx_obj *rq;
 	unsigned int i;
 	int ret = 0;
+	bool need_auto = false;
+	uint16_t self_port = dev->data->port_id;
 
 	for (i = 0; i != priv->txqs_n; ++i) {
 		txq_ctrl = mlx5_txq_get(dev, i);
@@ -223,6 +225,25 @@
 			mlx5_txq_release(dev, i);
 			continue;
 		}
+		if (txq_ctrl->hairpin_conf.peers[0].port != self_port)
+			continue;
+		if (txq_ctrl->hairpin_conf.manual_bind) {
+			mlx5_txq_release(dev, i);
+			return 0;
+		}
+		need_auto = true;
+		mlx5_txq_release(dev, i);
+	}
+	if (!need_auto)
+		return 0;
+	for (i = 0; i != priv->txqs_n; ++i) {
+		txq_ctrl = mlx5_txq_get(dev, i);
+		if (!txq_ctrl)
+			continue;
+		if (txq_ctrl->type != MLX5_TXQ_TYPE_HAIRPIN) {
+			mlx5_txq_release(dev, i);
+			continue;
+		}
 		if (!txq_ctrl->obj) {
 			rte_errno = ENOMEM;
 			DRV_LOG(ERR, "port %u no txq object found: %d",
@@ -798,9 +819,13 @@
 			dev->data->port_id, strerror(rte_errno));
 		goto error;
 	}
+	/*
+	 * Such step will be skipped if there is no hairpin TX queue configured
+	 * with RX peer queue from the same device.
+	 */
 	ret = mlx5_hairpin_auto_bind(dev);
 	if (ret) {
-		DRV_LOG(ERR, "port %u hairpin binding failed: %s",
+		DRV_LOG(ERR, "port %u hairpin auto binding failed: %s",
 			dev->data->port_id, strerror(rte_errno));
 		goto error;
 	}
@@ -949,7 +974,10 @@
 		struct mlx5_txq_ctrl *txq_ctrl = mlx5_txq_get(dev, i);
 		if (!txq_ctrl)
 			continue;
-		if (txq_ctrl->type == MLX5_TXQ_TYPE_HAIRPIN) {
+		if (txq_ctrl->type == MLX5_TXQ_TYPE_HAIRPIN &&
+		    !txq_ctrl->hairpin_conf.manual_bind &&
+		    txq_ctrl->hairpin_conf.peers[0].port ==
+		    priv->dev_data->port_id) {
 			ret = mlx5_ctrl_flow_source_queue(dev, i);
 			if (ret) {
 				mlx5_txq_release(dev, i);
-- 
1.8.3.1