[dpdk-dev] [PATCH v12 09/11] net/i40e: implement power management API

[Anatoly Burakov]

From: Liang Ma <liang.j...@intel.com>

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.

Signed-off-by: Liang Ma <liang.j...@intel.com>
Signed-off-by: Anatoly Burakov <anatoly.bura...@intel.com>
Acked-by: Konstantin Ananyev <konstantin.anan...@intel.com>
Acked-by: Jeff Guo <jia....@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c |  1 +
 drivers/net/i40e/i40e_rxtx.c   | 25 +++++++++++++++++++++++++
 drivers/net/i40e/i40e_rxtx.h   |  1 +
 3 files changed, 27 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index f54769c29d..af2577a140 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -510,6 +510,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
        .mtu_set                      = i40e_dev_mtu_set,
        .tm_ops_get                   = i40e_tm_ops_get,
        .tx_done_cleanup              = i40e_tx_done_cleanup,
+       .get_monitor_addr             = i40e_get_monitor_addr,
 };
 
 /* store statistics names and its offset in stats structure */
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 5df9a9df56..0b4220fc9c 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -72,6 +72,31 @@
 #define I40E_TX_OFFLOAD_NOTSUP_MASK \
                (PKT_TX_OFFLOAD_MASK ^ I40E_TX_OFFLOAD_MASK)
 
+int
+i40e_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc)
+{
+       struct i40e_rx_queue *rxq = rx_queue;
+       volatile union i40e_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 << I40E_RX_DESC_STATUS_DD_SHIFT);
+       pmc->mask = rte_cpu_to_le_64(1 << I40E_RX_DESC_STATUS_DD_SHIFT);
+
+       /* registers are 64-bit */
+       pmc->data_sz = sizeof(uint64_t);
+
+       return 0;
+}
+
 static inline void
 i40e_rxd_to_vlan_tci(struct rte_mbuf *mb, volatile union i40e_rx_desc *rxdp)
 {
diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
index 57d7b4160b..e1494525ce 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -248,6 +248,7 @@ uint16_t i40e_recv_scattered_pkts_vec_avx2(void *rx_queue,
        struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
 uint16_t i40e_xmit_pkts_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
        uint16_t nb_pkts);
+int i40e_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc);
 
 /* For each value it means, datasheet of hardware can tell more details
  *
-- 
2.17.1