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

Olivier Matz olivier.matz at 6wind.com
Wed Mar 1 18:19:10 CET 2017


Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
---
 drivers/net/e1000/e1000_ethdev.h |  5 ++++
 drivers/net/e1000/em_ethdev.c    |  2 ++
 drivers/net/e1000/em_rxtx.c      | 49 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/drivers/net/e1000/e1000_ethdev.h b/drivers/net/e1000/e1000_ethdev.h
index 2b63b1a..e3fd7fc 100644
--- a/drivers/net/e1000/e1000_ethdev.h
+++ b/drivers/net/e1000/e1000_ethdev.h
@@ -380,6 +380,11 @@ 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(struct rte_eth_dev *dev,
+	uint16_t rx_queue_id, uint16_t offset);
+int eth_em_tx_descriptor_status(struct rte_eth_dev *dev,
+	uint16_t tx_queue_id, 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 4066ef9..4f34c14 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 d099d6a..1651454 100644
--- a/drivers/net/e1000/em_rxtx.c
+++ b/drivers/net/e1000/em_rxtx.c
@@ -1473,6 +1473,55 @@ eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset)
 	return !!(rxdp->status & E1000_RXD_STAT_DD);
 }
 
+int
+eth_em_rx_descriptor_status(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+	uint16_t offset)
+{
+	volatile uint8_t *status;
+	struct em_rx_queue *rxq;
+	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].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(struct rte_eth_dev *dev, uint16_t tx_queue_id,
+	uint16_t offset)
+{
+	volatile uint8_t *status;
+	struct em_tx_queue *txq;
+	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;
+	/* go to next desc that has the RS bit */
+	desc = ((desc + txq->tx_rs_thresh - 1) / txq->tx_rs_thresh) *
+		txq->tx_rs_thresh;
+	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)
 {
-- 
2.8.1



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