[dpdk-dev] [PATCH v9 04/10] ethdev: add simple power management API

[Liang Ma]

Add a simple API to allow getting address of next RX descriptor from the
PMD, as well as release notes information.

Signed-off-by: Liang Ma <liang.j.ma at intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---

Notes:
    v8:
    - Rename version map file name.

    v7:
    - Fixed queue ID validation
    - Fixed documentation

    v6:
    - Rebase on top of latest main
    - Ensure the API checks queue ID (Konstantin)
    - Removed accidental inclusion of unrelated release notes
    v5:
    - Bring function format in line with other functions in the file
    - Ensure the API is supported by the driver before calling it (Konstantin)
---
 doc/guides/rel_notes/release_20_11.rst |  5 +++++
 lib/librte_ethdev/rte_ethdev.c         | 23 +++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.h         | 28 ++++++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev_driver.h  | 28 ++++++++++++++++++++++++++
 lib/librte_ethdev/version.map          |  1 +
 5 files changed, 85 insertions(+)

diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst
index d8ac359e51..2827a000db 100644
--- a/doc/guides/rel_notes/release_20_11.rst
+++ b/doc/guides/rel_notes/release_20_11.rst
@@ -139,6 +139,11 @@ New Features
   Hairpin Tx part flow rules can be inserted explicitly.
   New API is added to get the hairpin peer ports list.
 
+* **ethdev: add 1 new EXPERIMENTAL API for PMD power management.**
+
+  * ``rte_eth_get_wake_addr()``
+  * add new eth_dev_ops ``get_wake_addr``
+
 * **Updated Broadcom bnxt driver.**
 
   Updated the Broadcom bnxt driver with new features and improvements, including:
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index b12bb3854d..4f3115fe8e 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -5138,6 +5138,29 @@ rte_eth_tx_burst_mode_get(uint16_t port_id, uint16_t queue_id,
 		       dev->dev_ops->tx_burst_mode_get(dev, queue_id, mode));
 }
 
+int
+rte_eth_get_wake_addr(uint16_t port_id, uint16_t queue_id,
+		volatile void **wake_addr, uint64_t *expected, uint64_t *mask,
+		uint8_t *data_sz)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	dev = &rte_eth_devices[port_id];
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->get_wake_addr, -ENOTSUP);
+
+	if (queue_id >= dev->data->nb_rx_queues) {
+		RTE_ETHDEV_LOG(ERR, "Invalid RX queue_id=%u\n", queue_id);
+		return -EINVAL;
+	}
+
+	return eth_err(port_id,
+		dev->dev_ops->get_wake_addr(dev->data->rx_queues[queue_id],
+			wake_addr, expected, mask, data_sz));
+}
+
 int
 rte_eth_dev_set_mc_addr_list(uint16_t port_id,
 			     struct rte_ether_addr *mc_addr_set,
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index e341a08817..11559e7bc8 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -4364,6 +4364,34 @@ __rte_experimental
 int rte_eth_tx_burst_mode_get(uint16_t port_id, uint16_t queue_id,
 	struct rte_eth_burst_mode *mode);
 
+/**
+ * Retrieve the wake up address for the receive queue.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param queue_id
+ *   The Rx queue on the Ethernet device for which information will be
+ *   retrieved.
+ * @param wake_addr
+ *   The pointer to the address which will be monitored.
+ * @param expected
+ *   The pointer to value to be expected when descriptor is set.
+ * @param mask
+ *   The pointer to comparison bitmask for the expected value.
+ * @param data_sz
+ *   The pointer to data size for the expected value and comparison bitmask.
+ *
+ * @return
+ *   - 0: Success.
+ *   -ENOTSUP: Operation not supported.
+ *   -EINVAL: Invalid parameters.
+ *   -ENODEV: Invalid port ID.
+ */
+__rte_experimental
+int rte_eth_get_wake_addr(uint16_t port_id, uint16_t queue_id,
+		volatile void **wake_addr, uint64_t *expected, uint64_t *mask,
+		uint8_t *data_sz);
+
 /**
  * Retrieve device registers and register attributes (number of registers and
  * register size)
diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
index c63b9f7eb7..d7548dfe74 100644
--- a/lib/librte_ethdev/rte_ethdev_driver.h
+++ b/lib/librte_ethdev/rte_ethdev_driver.h
@@ -752,6 +752,32 @@ typedef int (*eth_hairpin_queue_peer_unbind_t)
 	(struct rte_eth_dev *dev, uint16_t cur_queue, uint32_t direction);
 /**< @internal Unbind peer queue from the current queue. */
 
+/**
+ * @internal
+ * Get address of memory location whose contents will change whenever there is
+ * new data to be received on an RX queue.
+ *
+ * @param rxq
+ *   Ethdev queue pointer.
+ * @param tail_desc_addr
+ *   The pointer point to where the address will be stored.
+ * @param expected
+ *   The pointer point to value to be expected when descriptor is set.
+ * @param mask
+ *   The pointer point to comparison bitmask for the expected value.
+ * @param data_sz
+ *   Data size for the expected value (can be 1, 2, 4, or 8 bytes)
+ * @return
+ *   Negative errno value on error, 0 on success.
+ *
+ * @retval 0
+ *   Success
+ * @retval -EINVAL
+ *   Invalid parameters
+ */
+typedef int (*eth_get_wake_addr_t)(void *rxq, volatile void **tail_desc_addr,
+		uint64_t *expected, uint64_t *mask, uint8_t *data_sz);
+
 /**
  * @internal A structure containing the functions exported by an Ethernet driver.
  */
@@ -910,6 +936,8 @@ struct eth_dev_ops {
 	/**< Set up the connection between the pair of hairpin queues. */
 	eth_hairpin_queue_peer_unbind_t hairpin_queue_peer_unbind;
 	/**< Disconnect the hairpin queues of a pair from each other. */
+	eth_get_wake_addr_t get_wake_addr;
+	/**< Get next RX queue ring entry address. */
 };
 
 /**
diff --git a/lib/librte_ethdev/version.map b/lib/librte_ethdev/version.map
index 8ddda2547f..392c273712 100644
--- a/lib/librte_ethdev/version.map
+++ b/lib/librte_ethdev/version.map
@@ -244,6 +244,7 @@ EXPERIMENTAL {
 	rte_flow_get_restore_info;
 	rte_flow_tunnel_action_decap_release;
 	rte_flow_tunnel_item_release;
+	rte_eth_get_wake_addr;
 };
 
 INTERNAL {
-- 
2.17.1