[PATCH v4 1/3] ethdev: introduce ethdev desc dump API

[Dongdong Liu <liudongdong3@huawei.com>]

From: "Min Hu (Connor)" <humin29@huawei.com>

Added the ethdev Rx/Tx desc dump API which provides functions for query
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.

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
Acked-by: Ray Kinsella <mdr@ashroe.eu>
---
 doc/guides/rel_notes/release_22_11.rst |  7 ++++
 lib/ethdev/ethdev_driver.h             | 46 +++++++++++++++++++++++
 lib/ethdev/rte_ethdev.c                | 52 ++++++++++++++++++++++++++
 lib/ethdev/rte_ethdev.h                | 49 ++++++++++++++++++++++++
 lib/ethdev/version.map                 |  2 +
 5 files changed, 156 insertions(+)

diff --git a/doc/guides/rel_notes/release_22_11.rst b/doc/guides/rel_notes/release_22_11.rst
index f60161765b..d3f3f2e50c 100644
--- a/doc/guides/rel_notes/release_22_11.rst
+++ b/doc/guides/rel_notes/release_22_11.rst
@@ -55,6 +55,13 @@ New Features
      Also, make sure to start the actual text at the margin.
      =======================================================
 
+* **Added ethdev desc dump API, to dump Rx/Tx desc info from device.**
+
+Added the ethdev Rx/Tx desc dump API which provides functions for query
+descriptor from device. The 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.
+The dump format is vendor-specific.
 
 Removed Items
 -------------
diff --git a/lib/ethdev/ethdev_driver.h b/lib/ethdev/ethdev_driver.h
index a0e0b2ae88..76808dae89 100644
--- a/lib/ethdev/ethdev_driver.h
+++ b/lib/ethdev/ethdev_driver.h
@@ -1093,6 +1093,47 @@ typedef int (*eth_rx_queue_avail_thresh_query_t)(struct rte_eth_dev *dev,
 					uint16_t *rx_queue_id,
 					uint8_t *avail_thresh);
 
+
+/**
+ * @internal
+ * Dump Rx descriptor info to a file.
+ *
+ * It is used for debugging, not a dataplane API.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param num
+ *   The number of the descriptors to dump.
+ * @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 num);
+
+/**
+ * @internal
+ * Dump Tx descriptor info to a file.
+ *
+ * This API is used for debugging, not a dataplane API.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param num
+ *   The number of the descriptors to dump.
+ * @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 num);
+
 /**
  * @internal A structure containing the functions exported by an Ethernet driver.
  */
@@ -1308,6 +1349,11 @@ struct eth_dev_ops {
 	eth_rx_queue_avail_thresh_set_t rx_queue_avail_thresh_set;
 	/** Query Rx queue available descriptors threshold event */
 	eth_rx_queue_avail_thresh_query_t rx_queue_avail_thresh_query;
+
+	/** Dump Rx descriptor info */
+	eth_rx_hw_desc_dump_t eth_rx_hw_desc_dump;
+	/** Dump 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 1979dc0850..2093275d87 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -5917,6 +5917,58 @@ 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 num)
+{
+	struct rte_eth_dev *dev;
+	int ret;
+
+	if (file == NULL) {
+		RTE_ETHDEV_LOG(ERR, "Invalid file (NULL)\n");
+		return -EINVAL;
+	}
+
+	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, num);
+
+	return ret;
+}
+
+int
+rte_eth_tx_hw_desc_dump(FILE *file, uint16_t port_id, uint16_t queue_id,
+			uint16_t num)
+{
+	struct rte_eth_dev *dev;
+	int ret;
+
+	if (file == NULL) {
+		RTE_ETHDEV_LOG(ERR, "Invalid file (NULL)\n");
+		return -EINVAL;
+	}
+
+	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, num);
+
+	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 b62ac5bb6f..4671e6b28e 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -5221,6 +5221,55 @@ 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.
+ *
+ * This API is used for debugging, not a dataplane API.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param num
+ *   The number of the descriptors to dump.
+ * @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 num);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Dump ethdev Tx descriptor info to a file.
+ *
+ * This API is used for debugging, not a dataplane API.
+ *
+ * @param file
+ *   A pointer to a file for output.
+ * @param dev
+ *   Port (ethdev) handle.
+ * @param queue_id
+ *   The selected queue.
+ * @param num
+ *   The number of the descriptors to dump.
+ * @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 num);
+
+
 #include <rte_ethdev_core.h>
 
 /**
diff --git a/lib/ethdev/version.map b/lib/ethdev/version.map
index 03f52fee91..3c7c75b582 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 {
-- 
2.22.0