[PATCH v3 4/6] net/e1000: implement descriptor status API (em)

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

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 doc/guides/nics/features/e1000.ini |  2 ++
 drivers/net/e1000/e1000_ethdev.h   |  3 +++
 drivers/net/e1000/em_ethdev.c      |  2 ++
 drivers/net/e1000/em_rxtx.c        | 51 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)

diff --git a/doc/guides/nics/features/e1000.ini b/doc/guides/nics/features/e1000.ini
index 3aed7d709..6a7c6c7d7 100644
--- a/doc/guides/nics/features/e1000.ini
+++ b/doc/guides/nics/features/e1000.ini
@@ -21,6 +21,8 @@ VLAN offload         = Y
 QinQ offload         = Y
 L3 checksum offload  = Y
 L4 checksum offload  = Y
+Rx Descriptor Status = Y
+Tx Descriptor Status = Y
 Basic stats          = Y
 BSD nic_uio          = Y
 Linux UIO            = Y
diff --git a/drivers/net/e1000/e1000_ethdev.h b/drivers/net/e1000/e1000_ethdev.h
index cb760e986..8352d0a79 100644
--- a/drivers/net/e1000/e1000_ethdev.h
+++ b/drivers/net/e1000/e1000_ethdev.h
@@ -380,6 +380,9 @@ uint32_t eth_em_rx_queue_count(struct rte_eth_dev *dev,
 
 int eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset);
 
+int eth_em_rx_descriptor_status(void *rx_queue, uint16_t offset);
+int eth_em_tx_descriptor_status(void *tx_queue, uint16_t offset);
+
 int eth_em_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);
diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index e76e34bbe..7110af344 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -205,6 +205,8 @@ static const struct eth_dev_ops eth_em_ops = {
 	.rx_queue_release     = eth_em_rx_queue_release,
 	.rx_queue_count       = eth_em_rx_queue_count,
 	.rx_descriptor_done   = eth_em_rx_descriptor_done,
+	.rx_descriptor_status = eth_em_rx_descriptor_status,
+	.tx_descriptor_status = eth_em_tx_descriptor_status,
 	.tx_queue_setup       = eth_em_tx_queue_setup,
 	.tx_queue_release     = eth_em_tx_queue_release,
 	.rx_queue_intr_enable = eth_em_rx_queue_intr_enable,
diff --git a/drivers/net/e1000/em_rxtx.c b/drivers/net/e1000/em_rxtx.c
index a265cb41c..31819c5bd 100644
--- a/drivers/net/e1000/em_rxtx.c
+++ b/drivers/net/e1000/em_rxtx.c
@@ -1468,6 +1468,57 @@ eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset)
 	return !!(rxdp->status & E1000_RXD_STAT_DD);
 }
 
+int
+eth_em_rx_descriptor_status(void *rx_queue, uint16_t offset)
+{
+	struct em_rx_queue *rxq = rx_queue;
+	volatile uint8_t *status;
+	uint32_t desc;
+
+	if (unlikely(offset >= rxq->nb_rx_desc))
+		return -EINVAL;
+
+	if (offset >= rxq->nb_rx_desc - rxq->nb_rx_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].status;
+	if (*status & E1000_RXD_STAT_DD)
+		return RTE_ETH_RX_DESC_DONE;
+
+	return RTE_ETH_RX_DESC_AVAIL;
+}
+
+int
+eth_em_tx_descriptor_status(void *tx_queue, uint16_t offset)
+{
+	struct em_tx_queue *txq = tx_queue;
+	volatile uint8_t *status;
+	uint32_t desc;
+
+	if (unlikely(offset >= txq->nb_tx_desc))
+		return -EINVAL;
+
+	desc = txq->tx_tail + offset;
+	/* go to next desc that has the RS bit */
+	desc = ((desc + txq->tx_rs_thresh - 1) / txq->tx_rs_thresh) *
+		txq->tx_rs_thresh;
+	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].upper.fields.status;
+	if (*status & E1000_TXD_STAT_DD)
+		return RTE_ETH_TX_DESC_DONE;
+
+	return RTE_ETH_TX_DESC_FULL;
+}
+
 void
 em_dev_clear_queues(struct rte_eth_dev *dev)
 {
-- 
2.11.0