[dpdk-dev] [PATCH 17/31] net/sfc: add callback to get RxQ pending descriptors count

[Andrew Rybchenko <arybchenko@solarflare.com>]

Reviewed-by: Andrew Lee <alee@solarflare.com>
Reviewed-by: Robert Stonehouse <rstonehouse@solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/sfc/sfc_ethdev.c | 11 +++++++++++
 drivers/net/sfc/sfc_rx.c     | 16 ++++++++++++++++
 drivers/net/sfc/sfc_rx.h     |  3 +++
 3 files changed, 30 insertions(+)

diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 1d7993f..163f9ed 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -845,6 +845,16 @@ sfc_rx_queue_info_get(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 	sfc_adapter_unlock(sa);
 }
 
+static uint32_t
+sfc_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
+{
+	struct sfc_adapter *sa = dev->data->dev_private;
+
+	sfc_log_init(sa, "RxQ=%u", rx_queue_id);
+
+	return sfc_rx_qdesc_npending(sa, rx_queue_id);
+}
+
 static const struct eth_dev_ops sfc_eth_dev_ops = {
 	.dev_configure			= sfc_dev_configure,
 	.dev_start			= sfc_dev_start,
@@ -865,6 +875,7 @@ static const struct eth_dev_ops sfc_eth_dev_ops = {
 	.mtu_set			= sfc_dev_set_mtu,
 	.rx_queue_setup			= sfc_rx_queue_setup,
 	.rx_queue_release		= sfc_rx_queue_release,
+	.rx_queue_count			= sfc_rx_queue_count,
 	.tx_queue_setup			= sfc_tx_queue_setup,
 	.tx_queue_release		= sfc_tx_queue_release,
 	.flow_ctrl_get			= sfc_flow_ctrl_get,
diff --git a/drivers/net/sfc/sfc_rx.c b/drivers/net/sfc/sfc_rx.c
index 278d583..ff9d799 100644
--- a/drivers/net/sfc/sfc_rx.c
+++ b/drivers/net/sfc/sfc_rx.c
@@ -257,6 +257,22 @@ sfc_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 	return done_pkts;
 }
 
+unsigned int
+sfc_rx_qdesc_npending(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	struct sfc_rxq *rxq;
+
+	SFC_ASSERT(sw_index < sa->rxq_count);
+	rxq = sa->rxq_info[sw_index].rxq;
+
+	if (rxq == NULL || (rxq->state & SFC_RXQ_RUNNING) == 0)
+		return 0;
+
+	sfc_ev_qpoll(rxq->evq);
+
+	return rxq->pending - rxq->completed;
+}
+
 static void
 sfc_rx_qpurge(struct sfc_rxq *rxq)
 {
diff --git a/drivers/net/sfc/sfc_rx.h b/drivers/net/sfc/sfc_rx.h
index 69318ab..8064af6 100644
--- a/drivers/net/sfc/sfc_rx.h
+++ b/drivers/net/sfc/sfc_rx.h
@@ -140,6 +140,9 @@ void sfc_rx_qflush_failed(struct sfc_rxq *rxq);
 uint16_t sfc_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		       uint16_t nb_pkts);
 
+unsigned int sfc_rx_qdesc_npending(struct sfc_adapter *sa,
+				   unsigned int sw_index);
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.5.5