[dpdk-dev] [PATCH v11 1/2] ethdev: add an API to get device configuration

[Jie Wang <jie1x.wang@intel.com>]

The driver may change offloads info into dev->data->dev_conf
in dev_configure which may cause port->dev_conf and port->rx_conf
contain outdated values.

This patch adds a new API "rte_eth_dev_conf_get()" to help users
get device configuration.

Add information about the new API in release notes.

Signed-off-by: Jie Wang <jie1x.wang@intel.com>
---
 doc/guides/rel_notes/release_21_11.rst |  5 +++++
 lib/ethdev/rte_ethdev.c                | 20 ++++++++++++++++++++
 lib/ethdev/rte_ethdev.h                | 20 ++++++++++++++++++++
 lib/ethdev/version.map                 |  3 +++
 4 files changed, 48 insertions(+)

diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index 93082723cf..789fc2d4ba 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -67,6 +67,11 @@ New Features
   Added macros ETH_RSS_IPV4_CHKSUM and ETH_RSS_L4_CHKSUM, now IPv4 and
   TCP/UDP/SCTP header checksum field can be used as input set for RSS.
 
+* **Added support for users get device configuration in ethdev.**
+
+  Added an ethdev API which can help users get device configuration.
+  The declarations for the API's can be found in ``rte_ethdev.h``.
+
 * **Updated Broadcom bnxt PMD.**
 
   * Added flow offload support for Thor.
diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 028907bc4b..be3ceb8131 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -3437,6 +3437,26 @@ rte_eth_dev_info_get(uint16_t port_id, struct rte_eth_dev_info *dev_info)
 	return 0;
 }
 
+int
+rte_eth_dev_conf_get(uint16_t port_id, struct rte_eth_conf *dev_conf)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+
+	if (dev_conf == NULL) {
+		RTE_ETHDEV_LOG(ERR,
+			"Cannot get ethdev port %u configuration to NULL\n",
+			port_id);
+		return -EINVAL;
+	}
+
+	memcpy(dev_conf, &dev->data->dev_conf, sizeof(struct rte_eth_conf));
+
+	return 0;
+}
+
 int
 rte_eth_dev_get_supported_ptypes(uint16_t port_id, uint32_t ptype_mask,
 				 uint32_t *ptypes, int num)
diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
index 6d80514ba7..f42f950fea 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -3052,6 +3052,26 @@ int rte_eth_macaddr_get(uint16_t port_id, struct rte_ether_addr *mac_addr);
  */
 int rte_eth_dev_info_get(uint16_t port_id, struct rte_eth_dev_info *dev_info);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Retrieve the configuration of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param dev_conf
+ *   A pointer to a structure of type *rte_eth_conf* to be filled with
+ *   the configuration of the Ethernet device.
+ *   And the memory of the structure should be allocated by the caller.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if *port_id* invalid.
+ *   - (-EINVAL) if bad parameter.
+ */
+__rte_experimental
+int rte_eth_dev_conf_get(uint16_t port_id, struct rte_eth_conf *dev_conf);
+
 /**
  * Retrieve the firmware version of a device.
  *
diff --git a/lib/ethdev/version.map b/lib/ethdev/version.map
index efd729c0f2..c516837723 100644
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -245,6 +245,9 @@ EXPERIMENTAL {
 	rte_mtr_meter_policy_delete;
 	rte_mtr_meter_policy_update;
 	rte_mtr_meter_policy_validate;
+
+	# added in 21.11
+	rte_eth_dev_conf_get;
 };
 
 INTERNAL {
-- 
2.25.1