[dpdk-dev] [PATCH v2 1/7] fm10k: implement rx_descriptor_done function

[Shaopeng He <shaopeng.he@intel.com>]

rx_descriptor_done is used by interrupt mode example application
(l3fwd-power) to check rxd DD bit to decide the RX trend,
then l3fwd-power will adjust the cpu frequency according to
the result.

Signed-off-by: Shaopeng He <shaopeng.he@intel.com>
---
 drivers/net/fm10k/fm10k.h        |  3 +++
 drivers/net/fm10k/fm10k_ethdev.c |  1 +
 drivers/net/fm10k/fm10k_rxtx.c   | 25 +++++++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
index c089882..4fc5e8e 100644
--- a/drivers/net/fm10k/fm10k.h
+++ b/drivers/net/fm10k/fm10k.h
@@ -311,6 +311,9 @@ uint16_t fm10k_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 uint16_t fm10k_recv_scattered_pkts(void *rx_queue,
 		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
 
+int
+fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset);
+
 uint16_t fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 	uint16_t nb_pkts);
 #endif
diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index a69c990..a82cd59 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -2049,6 +2049,7 @@ static const struct eth_dev_ops fm10k_eth_dev_ops = {
 	.rx_queue_release	= fm10k_rx_queue_release,
 	.tx_queue_setup		= fm10k_tx_queue_setup,
 	.tx_queue_release	= fm10k_tx_queue_release,
+	.rx_descriptor_done	= fm10k_dev_rx_descriptor_done,
 	.reta_update		= fm10k_reta_update,
 	.reta_query		= fm10k_reta_query,
 	.rss_hash_update	= fm10k_rss_hash_update,
diff --git a/drivers/net/fm10k/fm10k_rxtx.c b/drivers/net/fm10k/fm10k_rxtx.c
index d3f7b89..5c56fc2 100644
--- a/drivers/net/fm10k/fm10k_rxtx.c
+++ b/drivers/net/fm10k/fm10k_rxtx.c
@@ -354,6 +354,31 @@ fm10k_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 	return nb_rcv;
 }
 
+int
+fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
+{
+	volatile union fm10k_rx_desc *rxdp;
+	struct fm10k_rx_queue *rxq = rx_queue;
+	uint16_t desc;
+	int ret;
+
+	if (unlikely(offset >= rxq->nb_desc)) {
+		PMD_DRV_LOG(ERR, "Invalid RX queue id %u", offset);
+		return 0;
+	}
+
+	desc = rxq->next_dd + offset;
+	if (desc >= rxq->nb_desc)
+		desc -= rxq->nb_desc;
+
+	rxdp = &rxq->hw_ring[desc];
+
+	ret = !!(rxdp->w.status &
+			rte_cpu_to_le_16(FM10K_RXD_STATUS_DD));
+
+	return ret;
+}
+
 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 {
 	uint16_t next_rs, count = 0;
-- 
1.9.3