[dpdk-dev] [PATCH v1] net/iavf: implement power management API

[David Hunt]

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

This patch is basically a cut-and-paste of the changes already
committed in ixgbe, i40e and ice drivers in 21.02. This extends
the availability of the power-saving mechanism to the iavf driver,
which is needed for those use-cases using virtual functions.

Patch set where PMD Power Manamgement added in 21.02:
http://patchwork.dpdk.org/project/dpdk/list/?series=14756

Signed-off-by: David Hunt <david.hunt at intel.com>
---
 drivers/net/iavf/iavf_ethdev.c |  1 +
 drivers/net/iavf/iavf_rxtx.c   | 25 +++++++++++++++++++++++++
 drivers/net/iavf/iavf_rxtx.h   |  1 +
 3 files changed, 27 insertions(+)

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index 4d3772202..760aa41c1 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -197,6 +197,7 @@ static const struct eth_dev_ops iavf_eth_dev_ops = {
 	.rx_queue_intr_disable      = iavf_dev_rx_queue_intr_disable,
 	.filter_ctrl                = iavf_dev_filter_ctrl,
 	.tx_done_cleanup	    = iavf_dev_tx_done_cleanup,
+	.get_monitor_addr           = iavf_get_monitor_addr,
 };
 
 static int
diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 8fafe4579..caf14a232 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -57,6 +57,31 @@ iavf_proto_xtr_type_to_rxdid(uint8_t flex_type)
 				rxdid_map[flex_type] : IAVF_RXDID_COMMS_OVS_1;
 }
 
+int
+iavf_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc)
+{
+	struct iavf_rx_queue *rxq = rx_queue;
+	volatile union iavf_rx_desc *rxdp;
+	uint16_t desc;
+
+	desc = rxq->rx_tail;
+	rxdp = &rxq->rx_ring[desc];
+	/* watch for changes in status bit */
+	pmc->addr = &rxdp->wb.qword1.status_error_len;
+
+	/*
+	 * we expect the DD bit to be set to 1 if this descriptor was already
+	 * written to.
+	 */
+	pmc->val = rte_cpu_to_le_64(1 << IAVF_RX_DESC_STATUS_DD_SHIFT);
+	pmc->mask = rte_cpu_to_le_64(1 << IAVF_RX_DESC_STATUS_DD_SHIFT);
+
+	/* registers are 64-bit */
+	pmc->size = sizeof(uint64_t);
+
+	return 0;
+}
+
 static inline int
 check_rx_thresh(uint16_t nb_desc, uint16_t thresh)
 {
diff --git a/drivers/net/iavf/iavf_rxtx.h b/drivers/net/iavf/iavf_rxtx.h
index 922ddadad..5377459ea 100644
--- a/drivers/net/iavf/iavf_rxtx.h
+++ b/drivers/net/iavf/iavf_rxtx.h
@@ -469,6 +469,7 @@ uint16_t iavf_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 			    uint16_t nb_pkts);
 uint16_t iavf_xmit_pkts_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
 				 uint16_t nb_pkts);
+int iavf_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc);
 int iavf_rx_vec_dev_check(struct rte_eth_dev *dev);
 int iavf_tx_vec_dev_check(struct rte_eth_dev *dev);
 int iavf_rxq_vec_setup(struct iavf_rx_queue *rxq);
-- 
2.17.1