[v2,1/4] ethdev: introduce ethdev HW desc dump PI

diff --git a/doc/guides/rel_notes/release_22_07.rst b/doc/guides/rel_notes/release_22_07.rst
index 0ed4f92820..cfb9117dd3 100644
--- a/doc/guides/rel_notes/release_22_07.rst
+++ b/doc/guides/rel_notes/release_22_07.rst
@@ -95,6 +95,12 @@  New Features
   * Added AH mode support in lookaside protocol (IPsec) for CN9K & CN10K.
   * Added AES-GMAC support in lookaside protocol (IPsec) for CN9K & CN10K.
 
+* **Added ethdev HW desc dump API, to dump Rx/Tx HW desc info from device.**
+
+  Added the ethdev HW Rx desc dump API which provides functions for query
+  HW descriptor from device. HW descriptor info differs in different NICs.
+  The information demonstrates I/O process which is important for debug.
+  As the information is different between NICs, the new API is introduced.
 
 Removed Items
 -------------
diff --git a/lib/ethdev/ethdev_driver.h b/lib/ethdev/ethdev_driver.h
index 69d9dc21d8..9c1726eb2d 100644
--- a/lib/ethdev/ethdev_driver.h
+++ b/lib/ethdev/ethdev_driver.h
@@ -1073,6 +1073,42 @@  typedef int (*eth_ip_reassembly_conf_set_t)(struct rte_eth_dev *dev,
  */
 typedef int (*eth_dev_priv_dump_t)(struct rte_eth_dev *dev, FILE *file);
 
+/**
+ * @internal
+ * Dump ethdev Rx descriptor info to a file.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param desc_id
+ *   The selected descriptor.
+ * @return
+ *   Negative errno value on error, zero on success.
+ */
+typedef int (*eth_rx_hw_desc_dump_t)(FILE *file, const struct rte_eth_dev *dev,
+				     uint16_t queue_id, uint16_t desc_id);
+
+/**
+ * @internal
+ * Dump ethdev Tx descriptor info to a file.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param desc_id
+ *   The selected descriptor.
+ * @return
+ *   Negative errno value on error, zero on success.
+ */
+typedef int (*eth_tx_hw_desc_dump_t)(FILE *file, const struct rte_eth_dev *dev,
+				     uint16_t queue_id, uint16_t desc_id);
+
 /**
  * @internal A structure containing the functions exported by an Ethernet driver.
  */
@@ -1283,6 +1319,12 @@  struct eth_dev_ops {
 
 	/** Dump private info from device */
 	eth_dev_priv_dump_t eth_dev_priv_dump;
+
+	/** Dump ethdev Rx descriptor info */
+	eth_rx_hw_desc_dump_t eth_rx_hw_desc_dump;
+
+	/** Dump ethdev Tx descriptor info */
+	eth_tx_hw_desc_dump_t eth_tx_hw_desc_dump;
 };
 
 /**
diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index a175867651..09abee6345 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -5874,6 +5874,50 @@  rte_eth_dev_priv_dump(uint16_t port_id, FILE *file)
 	return eth_err(port_id, (*dev->dev_ops->eth_dev_priv_dump)(dev, file));
 }
 
+int
+rte_eth_rx_hw_desc_dump(FILE *file, uint16_t port_id, uint16_t queue_id,
+			uint16_t desc_id)
+{
+	struct rte_eth_dev *dev;
+	int ret;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+
+	if (queue_id >= dev->data->nb_rx_queues) {
+		RTE_ETHDEV_LOG(ERR, "Invalid Rx queue_id=%u\n", queue_id);
+		return -EINVAL;
+	}
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->eth_rx_hw_desc_dump, -ENOTSUP);
+	ret = (*dev->dev_ops->eth_rx_hw_desc_dump)(file, dev, queue_id,
+						   desc_id);
+
+	return ret;
+}
+
+int
+rte_eth_tx_hw_desc_dump(FILE *file, uint16_t port_id, uint16_t queue_id,
+			uint16_t desc_id)
+{
+	struct rte_eth_dev *dev;
+	int ret;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+
+	if (queue_id >= dev->data->nb_tx_queues) {
+		RTE_ETHDEV_LOG(ERR, "Invalid Tx queue_id=%u\n", queue_id);
+		return -EINVAL;
+	}
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->eth_tx_hw_desc_dump, -ENOTSUP);
+	ret = (*dev->dev_ops->eth_tx_hw_desc_dump)(file, dev, queue_id,
+						   desc_id);
+
+	return ret;
+}
+
 RTE_LOG_REGISTER_DEFAULT(rte_eth_dev_logtype, INFO);
 
 RTE_INIT(ethdev_init_telemetry)
diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
index 02df65d923..56ae630209 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -5456,6 +5456,50 @@  typedef struct {
 __rte_experimental
 int rte_eth_dev_priv_dump(uint16_t port_id, FILE *file);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Dump ethdev Rx descriptor info to a file.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param desc_id
+ *   The selected descriptor.
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+__rte_experimental
+int rte_eth_rx_hw_desc_dump(FILE *file, uint16_t port_id, uint16_t queue_id,
+			    uint16_t desc_id);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Dump ethdev Tx descriptor info to a file.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param desc_id
+ *   The selected descriptor.
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+__rte_experimental
+int rte_eth_tx_hw_desc_dump(FILE *file, uint16_t port_id, uint16_t queue_id,
+			    uint16_t desc_id);
+
 #include <rte_ethdev_core.h>
 
 /**
diff --git a/lib/ethdev/version.map b/lib/ethdev/version.map
index daca7851f2..109f4ea818 100644
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -285,6 +285,8 @@  EXPERIMENTAL {
 	rte_mtr_color_in_protocol_priority_get;
 	rte_mtr_color_in_protocol_set;
 	rte_mtr_meter_vlan_table_update;
+	rte_eth_rx_hw_desc_dump;
+	rte_eth_tx_hw_desc_dump;
 };
 
 INTERNAL {