ethdev: add API to get device configuration

The driver may change offloads info into dev->data->dev_conf
in dev_configure which may cause apps use outdated values.

Add a new API to get actual device configuration.

Signed-off-by: Jie Wang <jie1x.wang@intel.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index 69ec192..3129741 100644 (file)
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -103,6 +103,10 @@ New Features
   * Default VLAN strip behavior was changed. VLAN tag won't be stripped
     unless ``DEV_RX_OFFLOAD_VLAN_STRIP`` offload is enabled.
 
+* **Added API to get device configuration in ethdev.**
+
+  Added an ethdev API which can help users get device configuration.
+
 * **Updated AF_XDP PMD.**
 
   * Disabled secondary process support.

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 2426946..66f905c 100644 (file)
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -3420,6 +3420,26 @@ 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 934066f..b7db294 100644 (file)
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -3076,6 +3076,24 @@ int rte_eth_macaddrs_get(uint16_t port_id, struct rte_ether_addr *ma,
  */
 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
+ *   Location for Ethernet device configuration to be filled in.
+ * @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 6c68d97..5e6f59c 100644 (file)
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -249,6 +249,7 @@ EXPERIMENTAL {
        rte_mtr_meter_policy_validate;
 
        # added in 21.11
+       rte_eth_dev_conf_get;
        rte_eth_macaddrs_get;
        rte_eth_rx_metadata_negotiate;
        rte_flow_pick_transfer_proxy;