[dpdk-dev] [PATCH v7 07/10] 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_wake_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   | 26 ++++++++++++++++++++++++++
 drivers/net/i40e/i40e_rxtx.h   |  2 ++
 3 files changed, 29 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 943cfe71dc..cab86f8ec9 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -513,6 +513,7 @@ 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_wake_addr                = i40e_get_wake_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 f2844d3f74..cdb1cd494b 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -71,6 +71,32 @@
 #define I40E_TX_OFFLOAD_NOTSUP_MASK \
                (PKT_TX_OFFLOAD_MASK ^ I40E_TX_OFFLOAD_MASK)
 
+int
+i40e_get_wake_addr(void *rx_queue, volatile void **tail_desc_addr,
+               uint64_t *expected, uint64_t *mask, uint8_t *data_sz)
+{
+       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 */
+       *tail_desc_addr = &rxdp->wb.qword1.status_error_len;
+
+       /*
+        * we expect the DD bit to be set to 1 if this descriptor was already
+        * written to.
+        */
+       *expected = rte_cpu_to_le_64(1 << I40E_RX_DESC_STATUS_DD_SHIFT);
+       *mask = rte_cpu_to_le_64(1 << I40E_RX_DESC_STATUS_DD_SHIFT);
+
+       /* registers are 64-bit */
+       *data_sz = 8;
+
+       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..5826cf1099 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -248,6 +248,8 @@ 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_wake_addr(void *rx_queue, volatile void **tail_desc_addr,
+               uint64_t *expected, uint64_t *value, uint8_t *data_sz);
 
 /* For each value it means, datasheet of hardware can tell more details
  *
-- 
2.17.1