[RFC,4/6] net/i40e: implement power management API
diff mbox series

Message ID d2e2f6ba5989ed06b5e0921d942b62355ea97775.1590598121.git.anatoly.burakov@intel.com
State New
Delegated to: Thomas Monjalon
Headers show
Series
  • Power-optimized RX for Ethernet devices
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Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Anatoly Burakov May 27, 2020, 5:02 p.m. UTC
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 J. Ma <liang.j.ma@intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c |  1 +
 drivers/net/i40e/i40e_rxtx.c   | 23 +++++++++++++++++++++++
 drivers/net/i40e/i40e_rxtx.h   |  2 ++
 3 files changed, 26 insertions(+)

Patch
diff mbox series

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 749d85f544..f3ce54911b 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -526,6 +526,7 @@  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,
+	.next_rx_desc	              = i40e_next_rx_desc,
 };
 
 /* 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 5e7c86ed82..76dfbb2098 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -71,6 +71,29 @@ 
 #define I40E_TX_OFFLOAD_NOTSUP_MASK \
 		(PKT_TX_OFFLOAD_MASK ^ I40E_TX_OFFLOAD_MASK)
 
+int
+i40e_next_rx_desc(void *rx_queue, volatile void **tail_desc_addr,
+		uint64_t *expected, uint64_t *mask)
+{
+	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);
+
+	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 8f11f011a7..72d810475b 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -245,6 +245,8 @@  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_next_rx_desc(void *rx_queue, volatile void **tail_desc_addr,
+		uint64_t *expected, uint64_t *value);
 
 /* For each value it means, datasheet of hardware can tell more details
  *