[dpdk-stable] [PATCH v9 1/3] ethdev: add an API to get device configuration info

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

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

Cc: stable@dpdk.org

Signed-off-by: Jie Wang <jie1x.wang@intel.com>
---
 lib/ethdev/rte_ethdev.c | 23 +++++++++++++++++++++++
 lib/ethdev/rte_ethdev.h | 21 +++++++++++++++++++++
 lib/ethdev/version.map  |  3 +++
 3 files changed, 47 insertions(+)

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index daf5ca9242..a0f521323a 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -3457,6 +3457,29 @@ rte_eth_dev_info_get(uint16_t port_id, struct rte_eth_dev_info *dev_info)
 	return 0;
 }
 
+int
+rte_eth_dev_conf_info_get(uint16_t port_id,
+				struct rte_eth_conf *dev_conf_info)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+
+	if (dev_conf_info == NULL) {
+		RTE_ETHDEV_LOG(ERR,
+			"Cannot get ethdev port %u configuration info to NULL\n",
+			port_id);
+		return -EINVAL;
+	}
+
+	/* copy dev->data->dev_conf to dev_conf_info */
+	memcpy(dev_conf_info, &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 1da37896d8..c21ee6a1fe 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -3068,6 +3068,27 @@ 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_info
+ *   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_info_get(uint16_t port_id,
+				struct rte_eth_conf *dev_conf_info);
+
 /**
  * Retrieve the firmware version of a device.
  *
diff --git a/lib/ethdev/version.map b/lib/ethdev/version.map
index 904bce6ea1..4b0a1f0fae 100644
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -247,6 +247,9 @@ EXPERIMENTAL {
 	rte_mtr_meter_policy_delete;
 	rte_mtr_meter_policy_update;
 	rte_mtr_meter_policy_validate;
+
+	# added in 21.11
+	rte_eth_dev_conf_info_get;
 };
 
 INTERNAL {
-- 
2.25.1