[dpdk-dev] [PATCH v2 2/4] eventdev: add caps API and PMD callbacks for eth Tx adapter

[Nikhil Rao <nikhil.rao@intel.com>]

The caps API allows the application to query if the transmit
stage is implemented in the eventdev PMD or uses the common
rte_service function. The PMD callbacks support the
eventdev PMD implementation of the adapter.

Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
---
 lib/librte_eventdev/rte_eventdev.h     |  33 +++++-
 lib/librte_eventdev/rte_eventdev_pmd.h | 200 +++++++++++++++++++++++++++++++++
 lib/librte_eventdev/rte_eventdev.c     |  37 ++++++
 3 files changed, 269 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eventdev/rte_eventdev.h b/lib/librte_eventdev/rte_eventdev.h
index b6fd6ee..4717292 100644
--- a/lib/librte_eventdev/rte_eventdev.h
+++ b/lib/librte_eventdev/rte_eventdev.h
@@ -1186,6 +1186,32 @@ struct rte_event {
 rte_event_crypto_adapter_caps_get(uint8_t dev_id, uint8_t cdev_id,
 				  uint32_t *caps);
 
+/* Ethdev Tx adapter capability bitmap flags */
+#define RTE_EVENT_ETH_TX_ADAPTER_CAP_INTERNAL_PORT	0x1
+/**< This flag is sent when the PMD supports a packet transmit callback
+ */
+
+/**
+ * Retrieve the event device's eth Tx adapter capabilities
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @param eth_port_id
+ *   The identifier of the ethernet device.
+ *
+ * @param[out] caps
+ *   A pointer to memory filled with eth Tx adapter capabilities.
+ *
+ * @return
+ *   - 0: Success, driver provides eth Tx adapter capabilities.
+ *   - <0: Error code returned by the driver function.
+ *
+ */
+int __rte_experimental
+rte_event_eth_tx_adapter_caps_get(uint8_t dev_id, uint16_t eth_port_id,
+				uint32_t *caps);
+
 struct rte_eventdev_ops;
 struct rte_eventdev;
 
@@ -1204,6 +1230,10 @@ typedef uint16_t (*event_dequeue_burst_t)(void *port, struct rte_event ev[],
 		uint16_t nb_events, uint64_t timeout_ticks);
 /**< @internal Dequeue burst of events from port of a device */
 
+typedef uint16_t (*event_tx_adapter_enqueue)(void *port,
+				struct rte_event ev[], uint16_t nb_events);
+/**< @internal Enqueue burst of events on port of a device */
+
 #define RTE_EVENTDEV_NAME_MAX_LEN	(64)
 /**< @internal Max length of name of event PMD */
 
@@ -1266,7 +1296,8 @@ struct rte_eventdev {
 	/**< Pointer to PMD dequeue function. */
 	event_dequeue_burst_t dequeue_burst;
 	/**< Pointer to PMD dequeue burst function. */
-
+	event_tx_adapter_enqueue txa_enqueue;
+	/**< Pointer to PMD eth Tx adapter enqueue function. */
 	struct rte_eventdev_data *data;
 	/**< Pointer to device data */
 	struct rte_eventdev_ops *dev_ops;
diff --git a/lib/librte_eventdev/rte_eventdev_pmd.h b/lib/librte_eventdev/rte_eventdev_pmd.h
index 3fbb4d2..cd7145a 100644
--- a/lib/librte_eventdev/rte_eventdev_pmd.h
+++ b/lib/librte_eventdev/rte_eventdev_pmd.h
@@ -789,6 +789,186 @@ typedef int (*eventdev_crypto_adapter_stats_reset)
 			(const struct rte_eventdev *dev,
 			 const struct rte_cryptodev *cdev);
 
+/**
+ * Retrieve the event device's eth Tx adapter capabilities.
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @param eth_dev
+ *   Ethernet device pointer
+ *
+ * @param[out] caps
+ *   A pointer to memory filled with eth Tx adapter capabilities.
+ *
+ * @return
+ *   - 0: Success, driver provides eth Tx adapter capabilities
+ *   - <0: Error code returned by the driver function.
+ *
+ */
+typedef int (*eventdev_eth_tx_adapter_caps_get_t)
+					(const struct rte_eventdev *dev,
+					const struct rte_eth_dev *eth_dev,
+					uint32_t *caps);
+
+/**
+ * Create adapter callback.
+ *
+ * @param id
+ *   Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @return
+ *   - 0: Success.
+ *   - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_create_t)(uint8_t id,
+					const struct rte_eventdev *dev);
+
+/**
+ * Free adapter callback.
+ *
+ * @param id
+ *   Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @return
+ *   - 0: Success.
+ *   - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_free_t)(uint8_t id,
+					const struct rte_eventdev *dev);
+
+/**
+ * Add a Tx queue to the adapter.
+ * A queue value of -1 is used to indicate all
+ * queues within the device.
+ *
+ * @param id
+ *   Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @param eth_dev
+ *   Ethernet device pointer
+ *
+ * @param tx_queue_id
+ *   Transmt queue index
+ *
+ * @return
+ *   - 0: Success.
+ *   - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_queue_add_t)(
+					uint8_t id,
+					const struct rte_eventdev *dev,
+					const struct rte_eth_dev *eth_dev,
+					int32_t tx_queue_id);
+
+/**
+ * Delete a Tx queue from the adapter.
+ * A queue value of -1 is used to indicate all
+ * queues within the device, that have been added to this
+ * adapter.
+ *
+ * @param id
+ *   Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @param eth_dev
+ *   Ethernet device pointer
+ *
+ * @param tx_queue_id
+ *   Transmit queue index
+ *
+ * @return
+ *  - 0: Success, Queues deleted successfully.
+ *  - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_queue_del_t)(
+					uint8_t id,
+					const struct rte_eventdev *dev,
+					const struct rte_eth_dev *eth_dev,
+					int32_t tx_queue_id);
+
+/**
+ * Start the adapter.
+ *
+ * @param id
+ *   Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @return
+ *  - 0: Success, Adapter started correctly.
+ *  - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_start_t)(uint8_t id,
+					const struct rte_eventdev *dev);
+
+/**
+ * Stop the adapter.
+ *
+ * @param id
+ *  Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @return
+ *  - 0: Success.
+ *  - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_stop_t)(uint8_t id,
+					const struct rte_eventdev *dev);
+
+struct rte_event_eth_tx_adapter_stats;
+
+/**
+ * Retrieve statistics for an adapter
+ *
+ * @param id
+ *  Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @param [out] stats
+ *  A pointer to structure used to retrieve statistics for an adapter
+ *
+ * @return
+ *  - 0: Success, statistics retrieved successfully.
+ *  - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_stats_get_t)(
+				uint8_t id,
+				const struct rte_eventdev *dev,
+				struct rte_event_eth_tx_adapter_stats *stats);
+
+/**
+ * Reset statistics for an adapter
+ *
+ * @param id
+ *  Adapter identifier
+ *
+ * @param dev
+ *   Event device pointer
+ *
+ * @return
+ *  - 0: Success, statistics retrieved successfully.
+ *  - <0: Error code on failure.
+ */
+typedef int (*eventdev_eth_tx_adapter_stats_reset_t)(uint8_t id,
+					const struct rte_eventdev *dev);
+
 /** Event device operations function pointer table */
 struct rte_eventdev_ops {
 	eventdev_info_get_t dev_infos_get;	/**< Get device info. */
@@ -862,6 +1042,26 @@ struct rte_eventdev_ops {
 	eventdev_crypto_adapter_stats_reset crypto_adapter_stats_reset;
 	/**< Reset crypto stats */
 
+	eventdev_eth_tx_adapter_caps_get_t eth_tx_adapter_caps_get;
+	/**< Get ethernet Tx adapter capabilities */
+
+	eventdev_eth_tx_adapter_create_t eth_tx_adapter_create;
+	/**< Create adapter callback */
+	eventdev_eth_tx_adapter_free_t eth_tx_adapter_free;
+	/**< Free adapter callback */
+	eventdev_eth_tx_adapter_queue_add_t eth_tx_adapter_queue_add;
+	/**< Add Tx queues to the eth Tx adapter */
+	eventdev_eth_tx_adapter_queue_del_t eth_tx_adapter_queue_del;
+	/**< Delete Tx queues from the eth Tx adapter */
+	eventdev_eth_tx_adapter_start_t eth_tx_adapter_start;
+	/**< Start eth Tx adapter */
+	eventdev_eth_tx_adapter_stop_t eth_tx_adapter_stop;
+	/**< Stop eth Tx adapter */
+	eventdev_eth_tx_adapter_stats_get_t eth_tx_adapter_stats_get;
+	/**< Get eth Tx adapter statistics */
+	eventdev_eth_tx_adapter_stats_reset_t eth_tx_adapter_stats_reset;
+	/**< Reset eth Tx adapter statistics */
+
 	eventdev_selftest dev_selftest;
 	/**< Start eventdev Selftest */
 
diff --git a/lib/librte_eventdev/rte_eventdev.c b/lib/librte_eventdev/rte_eventdev.c
index 801810e..52097a8 100644
--- a/lib/librte_eventdev/rte_eventdev.c
+++ b/lib/librte_eventdev/rte_eventdev.c
@@ -175,6 +175,31 @@
 		(dev, cdev, caps) : -ENOTSUP;
 }
 
+int __rte_experimental
+rte_event_eth_tx_adapter_caps_get(uint8_t dev_id, uint16_t eth_port_id,
+				uint32_t *caps)
+{
+	struct rte_eventdev *dev;
+	struct rte_eth_dev *eth_dev;
+
+	RTE_EVENTDEV_VALID_DEVID_OR_ERR_RET(dev_id, -EINVAL);
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(eth_port_id, -EINVAL);
+
+	dev = &rte_eventdevs[dev_id];
+	eth_dev = &rte_eth_devices[eth_port_id];
+
+	if (caps == NULL)
+		return -EINVAL;
+
+	*caps = 0;
+
+	return dev->dev_ops->eth_tx_adapter_caps_get ?
+			(*dev->dev_ops->eth_tx_adapter_caps_get)(dev,
+								eth_dev,
+								caps)
+			: 0;
+}
+
 static inline int
 rte_event_dev_queue_config(struct rte_eventdev *dev, uint8_t nb_queues)
 {
@@ -1275,6 +1300,15 @@ int rte_event_dev_selftest(uint8_t dev_id)
 	return RTE_EVENT_MAX_DEVS;
 }
 
+static uint16_t
+rte_event_tx_adapter_enqueue(__rte_unused void *port,
+			__rte_unused struct rte_event ev[],
+			__rte_unused uint16_t nb_events)
+{
+	rte_errno = ENOTSUP;
+	return 0;
+}
+
 struct rte_eventdev *
 rte_event_pmd_allocate(const char *name, int socket_id)
 {
@@ -1295,6 +1329,9 @@ struct rte_eventdev *
 
 	eventdev = &rte_eventdevs[dev_id];
 
+	if (eventdev->txa_enqueue == NULL)
+		eventdev->txa_enqueue = rte_event_tx_adapter_enqueue;
+
 	if (eventdev->data == NULL) {
 		struct rte_eventdev_data *eventdev_data = NULL;
 
-- 
1.8.3.1