[dpdk-dev] [PATCH 26/32] net/ngbe: add Rx and Tx descriptor status

[Jiawen Wu <jiawenwu@trustnetic.com>]

Supports to get the number of used Rx descriptos,
and check the status of Rx and Tx descriptors.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 doc/guides/nics/features/ngbe.ini |  2 +
 drivers/net/ngbe/ngbe_ethdev.c    |  3 ++
 drivers/net/ngbe/ngbe_ethdev.h    |  6 +++
 drivers/net/ngbe/ngbe_rxtx.c      | 73 +++++++++++++++++++++++++++++++
 4 files changed, 84 insertions(+)

diff --git a/doc/guides/nics/features/ngbe.ini b/doc/guides/nics/features/ngbe.ini
index c780f1aa68..56d5d71ea8 100644
--- a/doc/guides/nics/features/ngbe.ini
+++ b/doc/guides/nics/features/ngbe.ini
@@ -32,6 +32,8 @@ Inner L3 checksum    = P
 Inner L4 checksum    = P
 Packet type parsing  = Y
 Timesync             = Y
+Rx descriptor status = Y
+Tx descriptor status = Y
 Basic stats          = Y
 Extended stats       = Y
 Stats per queue      = Y
diff --git a/drivers/net/ngbe/ngbe_ethdev.c b/drivers/net/ngbe/ngbe_ethdev.c
index 2d0c9e3453..ec652aa359 100644
--- a/drivers/net/ngbe/ngbe_ethdev.c
+++ b/drivers/net/ngbe/ngbe_ethdev.c
@@ -370,6 +370,9 @@ eth_ngbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 	PMD_INIT_FUNC_TRACE();
 
 	eth_dev->dev_ops = &ngbe_eth_dev_ops;
+	eth_dev->rx_queue_count       = ngbe_dev_rx_queue_count;
+	eth_dev->rx_descriptor_status = ngbe_dev_rx_descriptor_status;
+	eth_dev->tx_descriptor_status = ngbe_dev_tx_descriptor_status;
 	eth_dev->rx_pkt_burst = &ngbe_recv_pkts;
 	eth_dev->tx_pkt_burst = &ngbe_xmit_pkts;
 	eth_dev->tx_pkt_prepare = &ngbe_prep_pkts;
diff --git a/drivers/net/ngbe/ngbe_ethdev.h b/drivers/net/ngbe/ngbe_ethdev.h
index 98df1c3bf0..aacc0b68b2 100644
--- a/drivers/net/ngbe/ngbe_ethdev.h
+++ b/drivers/net/ngbe/ngbe_ethdev.h
@@ -181,6 +181,12 @@ int  ngbe_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 		uint16_t nb_tx_desc, unsigned int socket_id,
 		const struct rte_eth_txconf *tx_conf);
 
+uint32_t ngbe_dev_rx_queue_count(struct rte_eth_dev *dev,
+		uint16_t rx_queue_id);
+
+int ngbe_dev_rx_descriptor_status(void *rx_queue, uint16_t offset);
+int ngbe_dev_tx_descriptor_status(void *tx_queue, uint16_t offset);
+
 int ngbe_dev_rx_init(struct rte_eth_dev *dev);
 
 void ngbe_dev_tx_init(struct rte_eth_dev *dev);
diff --git a/drivers/net/ngbe/ngbe_rxtx.c b/drivers/net/ngbe/ngbe_rxtx.c
index ac97eec1c0..0b31474193 100644
--- a/drivers/net/ngbe/ngbe_rxtx.c
+++ b/drivers/net/ngbe/ngbe_rxtx.c
@@ -2263,6 +2263,79 @@ ngbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	return 0;
 }
 
+uint32_t
+ngbe_dev_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
+{
+#define NGBE_RXQ_SCAN_INTERVAL 4
+	volatile struct ngbe_rx_desc *rxdp;
+	struct ngbe_rx_queue *rxq;
+	uint32_t desc = 0;
+
+	rxq = dev->data->rx_queues[rx_queue_id];
+	rxdp = &rxq->rx_ring[rxq->rx_tail];
+
+	while ((desc < rxq->nb_rx_desc) &&
+		(rxdp->qw1.lo.status &
+			rte_cpu_to_le_32(NGBE_RXD_STAT_DD))) {
+		desc += NGBE_RXQ_SCAN_INTERVAL;
+		rxdp += NGBE_RXQ_SCAN_INTERVAL;
+		if (rxq->rx_tail + desc >= rxq->nb_rx_desc)
+			rxdp = &(rxq->rx_ring[rxq->rx_tail +
+				desc - rxq->nb_rx_desc]);
+	}
+
+	return desc;
+}
+
+int
+ngbe_dev_rx_descriptor_status(void *rx_queue, uint16_t offset)
+{
+	struct ngbe_rx_queue *rxq = rx_queue;
+	volatile uint32_t *status;
+	uint32_t nb_hold, desc;
+
+	if (unlikely(offset >= rxq->nb_rx_desc))
+		return -EINVAL;
+
+	nb_hold = rxq->nb_rx_hold;
+	if (offset >= rxq->nb_rx_desc - nb_hold)
+		return RTE_ETH_RX_DESC_UNAVAIL;
+
+	desc = rxq->rx_tail + offset;
+	if (desc >= rxq->nb_rx_desc)
+		desc -= rxq->nb_rx_desc;
+
+	status = &rxq->rx_ring[desc].qw1.lo.status;
+	if (*status & rte_cpu_to_le_32(NGBE_RXD_STAT_DD))
+		return RTE_ETH_RX_DESC_DONE;
+
+	return RTE_ETH_RX_DESC_AVAIL;
+}
+
+int
+ngbe_dev_tx_descriptor_status(void *tx_queue, uint16_t offset)
+{
+	struct ngbe_tx_queue *txq = tx_queue;
+	volatile uint32_t *status;
+	uint32_t desc;
+
+	if (unlikely(offset >= txq->nb_tx_desc))
+		return -EINVAL;
+
+	desc = txq->tx_tail + offset;
+	if (desc >= txq->nb_tx_desc) {
+		desc -= txq->nb_tx_desc;
+		if (desc >= txq->nb_tx_desc)
+			desc -= txq->nb_tx_desc;
+	}
+
+	status = &txq->tx_ring[desc].dw3;
+	if (*status & rte_cpu_to_le_32(NGBE_TXD_DD))
+		return RTE_ETH_TX_DESC_DONE;
+
+	return RTE_ETH_TX_DESC_FULL;
+}
+
 void
 ngbe_dev_clear_queues(struct rte_eth_dev *dev)
 {
-- 
2.21.0.windows.1