[PATCH 6/6] net/i40e: implement descriptor status API

[Olivier Matz <olivier.matz@6wind.com>]

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 drivers/net/i40e/i40e_ethdev.c    |  2 ++
 drivers/net/i40e/i40e_ethdev_vf.c |  2 ++
 drivers/net/i40e/i40e_rxtx.c      | 56 +++++++++++++++++++++++++++++++++++++++
 drivers/net/i40e/i40e_rxtx.h      |  4 +++
 4 files changed, 64 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 303027b..8b5fd54 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -479,6 +479,8 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
 	.rx_queue_release             = i40e_dev_rx_queue_release,
 	.rx_queue_count               = i40e_dev_rx_queue_count,
 	.rx_descriptor_done           = i40e_dev_rx_descriptor_done,
+	.rx_descriptor_status         = i40e_dev_rx_descriptor_status,
+	.tx_descriptor_status         = i40e_dev_tx_descriptor_status,
 	.tx_queue_setup               = i40e_dev_tx_queue_setup,
 	.tx_queue_release             = i40e_dev_tx_queue_release,
 	.dev_led_on                   = i40e_dev_led_on,
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 55fd344..d3659c9 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -217,6 +217,8 @@ static const struct eth_dev_ops i40evf_eth_dev_ops = {
 	.rx_queue_intr_enable = i40evf_dev_rx_queue_intr_enable,
 	.rx_queue_intr_disable = i40evf_dev_rx_queue_intr_disable,
 	.rx_descriptor_done   = i40e_dev_rx_descriptor_done,
+	.rx_descriptor_status = i40e_dev_rx_descriptor_status,
+	.tx_descriptor_status = i40e_dev_tx_descriptor_status,
 	.tx_queue_setup       = i40e_dev_tx_queue_setup,
 	.tx_queue_release     = i40e_dev_tx_queue_release,
 	.rx_queue_count       = i40e_dev_rx_queue_count,
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 45af0d7..b912689 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -1929,6 +1929,62 @@ i40e_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
 }
 
 int
+i40e_dev_rx_descriptor_status(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+	uint16_t offset)
+{
+	struct i40e_rx_queue *rxq;
+	volatile uint64_t *status;
+	uint64_t mask;
+	uint32_t desc;
+
+	rxq = dev->data->rx_queues[rx_queue_id];
+	if (unlikely(offset >= rxq->nb_rx_desc))
+		return -EINVAL;
+
+	if (offset >= rxq->nb_rx_desc - rxq->nb_rx_hold)
+		return RTE_ETH_RX_DESC_USED;
+
+	desc = rxq->rx_tail + offset;
+	if (desc >= rxq->nb_rx_desc)
+		desc -= rxq->nb_rx_desc;
+
+	status = &rxq->rx_ring[desc].wb.qword1.status_error_len;
+	mask = rte_le_to_cpu_64((1ULL << I40E_RX_DESC_STATUS_DD_SHIFT)
+		<< I40E_RXD_QW1_STATUS_SHIFT);
+	if (*status & mask)
+		return RTE_ETH_RX_DESC_DONE;
+
+	return RTE_ETH_RX_DESC_AVAIL;
+}
+
+int
+i40e_dev_tx_descriptor_status(struct rte_eth_dev *dev, uint16_t tx_queue_id,
+	uint16_t offset)
+{
+	struct i40e_tx_queue *txq;
+	volatile uint64_t *status;
+	uint64_t mask, expect;
+	uint32_t desc;
+
+	txq = dev->data->tx_queues[tx_queue_id];
+	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;
+
+	status = &txq->tx_ring[desc].cmd_type_offset_bsz;
+	mask = rte_le_to_cpu_64(I40E_TXD_QW1_DTYPE_MASK);
+	expect = rte_cpu_to_le_64(
+		I40E_TX_DESC_DTYPE_DESC_DONE << I40E_TXD_QW1_DTYPE_SHIFT);
+	if ((*status & mask) == expect)
+		return RTE_ETH_TX_DESC_DONE;
+
+	return RTE_ETH_TX_DESC_FULL;
+}
+
+int
 i40e_dev_tx_queue_setup(struct rte_eth_dev *dev,
 			uint16_t queue_idx,
 			uint16_t nb_desc,
diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
index 9df8a56..c32519e 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -246,6 +246,10 @@ void i40e_rx_queue_release_mbufs(struct i40e_rx_queue *rxq);
 uint32_t i40e_dev_rx_queue_count(struct rte_eth_dev *dev,
 				 uint16_t rx_queue_id);
 int i40e_dev_rx_descriptor_done(void *rx_queue, uint16_t offset);
+int i40e_dev_rx_descriptor_status(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+	uint16_t offset);
+int i40e_dev_tx_descriptor_status(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+	uint16_t offset);
 
 uint16_t i40e_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 			    uint16_t nb_pkts);
-- 
2.8.1