[dpdk-dev] [RFC PATCH v3 6/6] net/ice: implement power management API

[Liang Ma]

Implement support for the power management API by implementing a
`next_rx_desc` function that will return an address of an RX ring's
status bit.

Signed-off-by: Liang Ma <liang.j.ma at intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 drivers/net/ice/ice_ethdev.c |  1 +
 drivers/net/ice/ice_rxtx.c   | 23 +++++++++++++++++++++++
 drivers/net/ice/ice_rxtx.h   |  2 ++
 3 files changed, 26 insertions(+)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 8d435e8892..7d7e1dcbac 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -212,6 +212,7 @@ static const struct eth_dev_ops ice_eth_dev_ops = {
 	.udp_tunnel_port_add          = ice_dev_udp_tunnel_port_add,
 	.udp_tunnel_port_del          = ice_dev_udp_tunnel_port_del,
 	.tx_done_cleanup              = ice_tx_done_cleanup,
+	.next_rx_desc	              = ice_next_rx_desc,
 };
 
 /* store statistics names and its offset in stats structure */
diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 2e1f06d2c0..c043181ceb 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -24,6 +24,29 @@ uint64_t rte_net_ice_dynflag_proto_xtr_ipv6_mask;
 uint64_t rte_net_ice_dynflag_proto_xtr_ipv6_flow_mask;
 uint64_t rte_net_ice_dynflag_proto_xtr_tcp_mask;
 
+int ice_next_rx_desc(void *rx_queue, volatile void **tail_desc_addr,
+		uint64_t *expected, uint64_t *mask)
+{
+	volatile union ice_rx_flex_desc *rxdp;
+	struct ice_rx_queue *rxq = rx_queue;
+	uint16_t desc;
+
+	desc = rxq->rx_tail;
+	rxdp = &rxq->rx_ring[desc];
+	/* watch for changes in status bit */
+	*tail_desc_addr = &rxdp->wb.status_error0;
+
+	/*
+	 * we expect the DD bit to be set to 1 if this descriptor was already
+	 * written to.
+	 */
+	*expected = rte_cpu_to_le_16(1 << ICE_RX_FLEX_DESC_STATUS0_DD_S);
+	*mask = rte_cpu_to_le_16(1 << ICE_RX_FLEX_DESC_STATUS0_DD_S);
+
+	return 0;
+}
+
+
 static inline uint64_t
 ice_rxdid_to_proto_xtr_ol_flag(uint8_t rxdid)
 {
diff --git a/drivers/net/ice/ice_rxtx.h b/drivers/net/ice/ice_rxtx.h
index 2fdcfb7d04..7eb6fa904e 100644
--- a/drivers/net/ice/ice_rxtx.h
+++ b/drivers/net/ice/ice_rxtx.h
@@ -202,5 +202,7 @@ uint16_t ice_xmit_pkts_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
 				uint16_t nb_pkts);
 int ice_fdir_programming(struct ice_pf *pf, struct ice_fltr_desc *fdir_desc);
 int ice_tx_done_cleanup(void *txq, uint32_t free_cnt);
+int ice_next_rx_desc(void *rx_queue, volatile void **tail_desc_addr,
+		uint64_t *expected, uint64_t *mask);
 
 #endif /* _ICE_RXTX_H_ */
-- 
2.17.1