[dpdk-dev] [PATCH v8 1/2] 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.

Signed-off-by: Jie Wang <jie1x.wang@intel.com>
---
 lib/ethdev/rte_ethdev.c | 28 ++++++++++++++++++++++++++++
 lib/ethdev/rte_ethdev.h | 21 +++++++++++++++++++++
 lib/ethdev/version.map  |  3 +++
 3 files changed, 52 insertions(+)

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 9d95cd11e1..bbe24af662 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -3458,6 +3458,34 @@ 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;
+	}
+
+	/*
+	 * Init dev_conf_info before port_id check since caller does not have
+	 * return status and does not know if get is successful or not.
+	 */
+	memset(dev_conf_info, 0, sizeof(struct rte_eth_conf));
+
+	/* 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 d2b27c351f..3c5b02a133 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -3058,6 +3058,27 @@ 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 contextual information 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_dev* to be filled with
+ *   the contextual information of the Ethernet device.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENOTSUP) if support for dev_infos_get() does not exist for the device.
+ *   - (-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 44d30b05ae..40539f99f9 100644
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -249,6 +249,9 @@ 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