[dpdk-dev] [PATCH v3 1/7] net/mlx5: change hairpin queue peer checking

[Bing Zhao]

In the current implementation of single port mode hairpin, the peer
queue should belong to the same port of the current queue. When the
two ports hairpin mode is introduced, such checking should be removed
to make the hairpin queue setup execute successfully since it is not
an invalid condition, if the Tx port and Rx port are not the same.

In the meanwhile, different devices could have different queue
configurations. The queues number of peer port is unknown to the
current device. The checking should be removed also.

If the Tx and Rx port IDs of a hairpin peer are different, only the
manual binding and explicit Tx flows are supported. Or else, the four
combinations of modes could be supported. The mode attributes
consistency checking will be done when connecting the queue with its
peer queue.

Signed-off-by: Bing Zhao <bingz at nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
---
v3: fix attributes checking
---
 drivers/net/mlx5/mlx5_rxq.c | 32 ++++++++++++++++++++++++++------
 drivers/net/mlx5/mlx5_txq.c | 32 ++++++++++++++++++++++++++------
 2 files changed, 52 insertions(+), 12 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 1cc477a..034f43e 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -818,15 +818,35 @@
 	res = mlx5_rx_queue_pre_setup(dev, idx, &desc);
 	if (res)
 		return res;
-	if (hairpin_conf->peer_count != 1 ||
-	    hairpin_conf->peers[0].port != dev->data->port_id ||
-	    hairpin_conf->peers[0].queue >= priv->txqs_n) {
-		DRV_LOG(ERR, "port %u unable to setup hairpin queue index %u "
-			" invalid hairpind configuration", dev->data->port_id,
-			idx);
+	if (hairpin_conf->peer_count != 1) {
 		rte_errno = EINVAL;
+		DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue index %u"
+			" peer count is %u", dev->data->port_id,
+			idx, hairpin_conf->peer_count);
 		return -rte_errno;
 	}
+	if (hairpin_conf->peers[0].port == dev->data->port_id) {
+		if (hairpin_conf->peers[0].queue >= priv->txqs_n) {
+			rte_errno = EINVAL;
+			DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue"
+				" index %u, Tx %u is larger than %u",
+				dev->data->port_id, idx,
+				hairpin_conf->peers[0].queue, priv->txqs_n);
+			return -rte_errno;
+		}
+	} else {
+		if (hairpin_conf->manual_bind == 0 ||
+		    hairpin_conf->tx_explicit == 0) {
+			rte_errno = EINVAL;
+			DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue"
+				" index %u peer port %u with attributes %u %u",
+				dev->data->port_id, idx,
+				hairpin_conf->peers[0].port,
+				hairpin_conf->manual_bind,
+				hairpin_conf->tx_explicit);
+			return -rte_errno;
+		}
+	}
 	rxq_ctrl = mlx5_rxq_hairpin_new(dev, idx, desc, hairpin_conf);
 	if (!rxq_ctrl) {
 		DRV_LOG(ERR, "port %u unable to allocate queue index %u",
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 9c2dd2a..dca9c05 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -421,15 +421,35 @@
 	res = mlx5_tx_queue_pre_setup(dev, idx, &desc);
 	if (res)
 		return res;
-	if (hairpin_conf->peer_count != 1 ||
-	    hairpin_conf->peers[0].port != dev->data->port_id ||
-	    hairpin_conf->peers[0].queue >= priv->rxqs_n) {
-		DRV_LOG(ERR, "port %u unable to setup hairpin queue index %u "
-			" invalid hairpind configuration", dev->data->port_id,
-			idx);
+	if (hairpin_conf->peer_count != 1) {
 		rte_errno = EINVAL;
+		DRV_LOG(ERR, "port %u unable to setup Tx hairpin queue index %u"
+			" peer count is %u", dev->data->port_id,
+			idx, hairpin_conf->peer_count);
 		return -rte_errno;
 	}
+	if (hairpin_conf->peers[0].port == dev->data->port_id) {
+		if (hairpin_conf->peers[0].queue >= priv->rxqs_n) {
+			rte_errno = EINVAL;
+			DRV_LOG(ERR, "port %u unable to setup Tx hairpin queue"
+				" index %u, Rx %u is larger than %u",
+				dev->data->port_id, idx,
+				hairpin_conf->peers[0].queue, priv->txqs_n);
+			return -rte_errno;
+		}
+	} else {
+		if (hairpin_conf->manual_bind == 0 ||
+		    hairpin_conf->tx_explicit == 0) {
+			rte_errno = EINVAL;
+			DRV_LOG(ERR, "port %u unable to setup Tx hairpin queue"
+				" index %u peer port %u with attributes %u %u",
+				dev->data->port_id, idx,
+				hairpin_conf->peers[0].port,
+				hairpin_conf->manual_bind,
+				hairpin_conf->tx_explicit);
+			return -rte_errno;
+		}
+	}
 	txq_ctrl = mlx5_txq_hairpin_new(dev, idx, desc,	hairpin_conf);
 	if (!txq_ctrl) {
 		DRV_LOG(ERR, "port %u unable to allocate queue index %u",
-- 
1.8.3.1