[V7,1/3] ethdev: introduce FEC API

diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst
index cc72609..e19b037 100644
--- a/doc/guides/rel_notes/release_20_11.rst
+++ b/doc/guides/rel_notes/release_20_11.rst
@@ -55,6 +55,16 @@  New Features
      Also, make sure to start the actual text at the margin.
      =======================================================
 
+* **Added the FEC API, for a generic FEC query and config.**
+
+  Added the FEC API which provides functions for query FEC capabilities and
+  current FEC mode from device. Also, API for configuring FEC mode is also provided.
+
+* **Added hns3 FEC PMD, for supporting query and config FEC mode.**
+
+  Added the FEC PMD which provides functions for query FEC capabilities and
+  current FEC mode from device. Also, PMD for configuring FEC mode is also provided.
+
 
 Removed Items
 -------------
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 7858ad5..d7cd737 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -3642,6 +3642,55 @@  rte_eth_led_off(uint16_t port_id)
 	return eth_err(port_id, (*dev->dev_ops->dev_led_off)(dev));
 }
 
+int
+rte_eth_fec_get_capability(uint16_t port_id, uint32_t *fec_cap)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_get_capability, -ENOTSUP);
+	return eth_err(port_id, (*dev->dev_ops->fec_get_capability)(dev,
+								fec_cap));
+}
+
+int
+rte_eth_fec_get(uint16_t port_id, enum rte_eth_fec_mode *mode)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_get, -ENOTSUP);
+	return eth_err(port_id, (*dev->dev_ops->fec_get)(dev, mode));
+}
+
+int
+rte_eth_fec_set(uint16_t port_id, enum rte_eth_fec_mode mode)
+{
+	struct rte_eth_dev *dev;
+	uint32_t fec_mode_mask;
+	int ret;
+
+	ret = rte_eth_fec_get_capability(port_id, &fec_mode_mask);
+	if (ret != 0)
+		return ret;
+
+	/*
+	 * Check whether the configured mode is within the FEC capability.
+	 * If not, the configured mode will not be supported.
+	 */
+	if (!(fec_mode_mask & RTE_ETH_FEC_MODE_TO_CAPA(mode))) {
+		RTE_ETHDEV_LOG(ERR, "unsupported FEC mode = %d, port_id = %u\n",
+			       mode, port_id);
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_set, -ENOTSUP);
+	return eth_err(port_id, (*dev->dev_ops->fec_set)(dev, mode));
+}
+
 /*
  * Returns index into MAC address array of addr. Use 00:00:00:00:00:00 to find
  * an empty spot.
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 70295d7..1835fb9 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -1310,6 +1310,9 @@  struct rte_eth_conf {
 #define RTE_ETH_DEV_FALLBACK_RX_NBQUEUES 1
 #define RTE_ETH_DEV_FALLBACK_TX_NBQUEUES 1
 
+/* Translate from FEC mode to FEC capa */
+#define RTE_ETH_FEC_MODE_TO_CAPA(x)	(1U << (x))
+
 /**
  * Preferred Rx/Tx port parameters.
  * There are separate instances of this structure for transmission
@@ -1511,6 +1514,24 @@  struct rte_eth_dcb_info {
 	struct rte_eth_dcb_tc_queue_mapping tc_queue;
 };
 
+/**
+ * This enum indicates the possible (forward error correction)FEC modes
+ * of an ethdev port.
+ */
+enum rte_eth_fec_mode {
+	RTE_ETH_FEC_NOFEC = 0,      /**< FEC is off */
+	RTE_ETH_FEC_BASER,          /**< FEC using common algorithm */
+	RTE_ETH_FEC_RS,             /**< FEC using RS algorithm */
+	RTE_ETH_FEC_AUTO,           /**< FEC autonegotiation modes */
+};
+
+/* This indicates FEC capabilities */
+#define RTE_ETH_FEC_CAPA_NOFEC  (1U << RTE_ETH_FEC_NOFEC)
+#define RTE_ETH_FEC_CAPA_BASER  (1U << RTE_ETH_FEC_BASER)
+#define RTE_ETH_FEC_CAPA_RS     (1U << RTE_ETH_FEC_RS)
+#define RTE_ETH_FEC_CAPA_AUTO   (1U << RTE_ETH_FEC_AUTO)
+
+
 #define RTE_ETH_ALL RTE_MAX_ETHPORTS
 
 /* Macros to check for valid port */
@@ -3328,6 +3349,70 @@  int  rte_eth_led_on(uint16_t port_id);
 int  rte_eth_led_off(uint16_t port_id);
 
 /**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Get Forward Error Correction(FEC) capability.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param fec_cap
+ *   returns the FEC capability from the device, as follows:
+ *   RTE_ETH_FEC_CAPA_NOFEC
+ *   RTE_ETH_FEC_CAPA_BASER
+ *   RTE_ETH_FEC_CAPA_RS
+ *   RTE_ETH_FEC_CAPA_AUTO
+ * @return
+ *   - (0) if successful.
+ *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
+ *     that operation.
+ *   - (-EIO) if device is removed.
+ *   - (-ENODEV)  if *port_id* invalid.
+ */
+__rte_experimental
+int rte_eth_fec_get_capability(uint16_t port_id, uint32_t *fec_cap);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Get current Forward Error Correction(FEC) mode.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param mode
+ *   returns the FEC mode from the device.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
+ *     that operation.
+ *   - (-EIO) if device is removed.
+ *   - (-ENODEV)  if *port_id* invalid.
+ */
+__rte_experimental
+int rte_eth_fec_get(uint16_t port_id, enum rte_eth_fec_mode *mode);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
+ *
+ * Set Forward Error Correction(FEC) mode.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param mode
+ *   the FEC mode.
+ * @return
+ *   - (0) if successful.
+ *   - (-EINVAL) if the FEC mode is not valid.
+ *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
+ *   - (-EIO) if device is removed.
+ *   - (-ENODEV)  if *port_id* invalid.
+ */
+__rte_experimental
+int rte_eth_fec_set(uint16_t port_id, enum rte_eth_fec_mode mode);
+
+/**
  * Get current status of the Ethernet link flow control for Ethernet device
  *
  * @param port_id
diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
index 32407dd..755a15a 100644
--- a/lib/librte_ethdev/rte_ethdev_core.h
+++ b/lib/librte_ethdev/rte_ethdev_core.h
@@ -604,6 +604,78 @@  typedef int (*eth_tx_hairpin_queue_setup_t)
 	 const struct rte_eth_hairpin_conf *hairpin_conf);
 
 /**
+ * @internal
+ * Get Forward Error Correction(FEC) capability.
+ *
+ * @param dev
+ *   ethdev handle of port.
+ * @param fec_cap
+ *   returns the FEC capability from the device.
+ *
+ * @return
+ *   Negative errno value on error, 0 on success.
+ *
+ * @retval 0
+ *   Success, get FEC success.
+ * @retval -ENOTSUP
+ *   operation is not supported.
+ * @retval -EIO
+ *   device is removed.
+ * @retval -ENODEV
+ *   Device is gone.
+ */
+typedef int (*eth_fec_get_capability_t)(struct rte_eth_dev *dev,
+					uint32_t *fec_cap);
+
+/**
+ * @internal
+ * Get Forward Error Correction(FEC) mode.
+ *
+ * @param dev
+ *   ethdev handle of port.
+ * @param mode
+ *   returns the FEC mode from the device.
+ *
+ * @return
+ *   Negative errno value on error, 0 on success.
+ *
+ * @retval 0
+ *   Success, get FEC success.
+ * @retval -ENOTSUP
+ *   operation is not supported.
+ * @retval -EIO
+ *   device is removed.
+ * @retval -ENODEV
+ *   Device is gone.
+ */
+typedef int (*eth_fec_get_t)(struct rte_eth_dev *dev,
+			     enum rte_eth_fec_mode *mode);
+
+/**
+ * @internal
+ *   Set Forward Error Correction(FEC) mode.
+ *
+ * @param dev
+ *   ethdev handle of port.
+ * @param mode
+ *   the FEC mode.
+ *
+ * @return
+ *   Negative errno value on error, 0 on success.
+ *
+ * @retval 0
+ *   Success, set FEC success.
+ * @retval -ENOTSUP
+ *   operation is not supported.
+ * @retval -EIO
+ *   device is removed.
+ * @retval -ENODEV
+ *   Device is gone.
+ */
+typedef int (*eth_fec_set_t)(struct rte_eth_dev *dev,
+			     enum rte_eth_fec_mode mode);
+
+/**
  * @internal A structure containing the functions exported by an Ethernet driver.
  */
 struct eth_dev_ops {
@@ -752,6 +824,13 @@  struct eth_dev_ops {
 	/**< Set up device RX hairpin queue. */
 	eth_tx_hairpin_queue_setup_t tx_hairpin_queue_setup;
 	/**< Set up device TX hairpin queue. */
+
+	eth_fec_get_capability_t fec_get_capability;
+	/**< Get Forward Error Correction(FEC) capability; */
+	eth_fec_get_t fec_get;
+	/**< Get Forward Error Correction(FEC) mode; */
+	eth_fec_set_t fec_set;
+	/**< Set Forward Error Correction(FEC) mode; */
 };
 
 /**
diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
index 02081d9..9f3fb8f 100644
--- a/lib/librte_ethdev/rte_ethdev_version.map
+++ b/lib/librte_ethdev/rte_ethdev_version.map
@@ -239,6 +239,11 @@  EXPERIMENTAL {
 	__rte_ethdev_trace_rx_burst;
 	__rte_ethdev_trace_tx_burst;
 	rte_flow_get_aged_flows;
+
+	# added in 20.11
+	rte_eth_fec_get_capability;
+	rte_eth_fec_get;
+	rte_eth_fec_set;
 };
 
 INTERNAL {