[dpdk-dev] [PATCH v2] eventdev: flag to identify same destined packets enqueue

[Nipun Gupta <nipun.gupta@nxp.com>]

This patch introduces a `flag` in the Eth TX adapter enqueue API.
Some drivers may support burst functionality only with the packets
having same destination device and queue.

The flag `RTE_EVENT_ETH_TX_ADAPTER_ENQUEUE_SAME_DEST` can be used
to indicate this so the underlying driver, for drivers to utilize
burst functionality appropriately.

Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>
---

Changes in v2:
 - have separate internal API in tx adapter for sending burst packets to
   same eth dev, queue pair on the basis of the passed flag
 - fix compilation of examples/eventdev_pipeline/

 app/test-eventdev/test_pipeline_common.h      |  6 +++---
 .../prog_guide/event_ethernet_tx_adapter.rst  |  3 ++-
 .../eventdev_pipeline/pipeline_worker_tx.c    |  2 +-
 .../rte_event_eth_tx_adapter.h                | 19 +++++++++++++++++--
 lib/librte_eventdev/rte_eventdev.c            | 12 ++++++++++++
 lib/librte_eventdev/rte_eventdev.h            |  9 +++++++++
 6 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/app/test-eventdev/test_pipeline_common.h b/app/test-eventdev/test_pipeline_common.h
index 0440b9e29..6e73c6ab2 100644
--- a/app/test-eventdev/test_pipeline_common.h
+++ b/app/test-eventdev/test_pipeline_common.h
@@ -106,7 +106,7 @@ pipeline_event_tx(const uint8_t dev, const uint8_t port,
 		struct rte_event * const ev)
 {
 	rte_event_eth_tx_adapter_txq_set(ev->mbuf, 0);
-	while (!rte_event_eth_tx_adapter_enqueue(dev, port, ev, 1))
+	while (!rte_event_eth_tx_adapter_enqueue(dev, port, ev, 1, 0))
 		rte_pause();
 }
 
@@ -116,10 +116,10 @@ pipeline_event_tx_burst(const uint8_t dev, const uint8_t port,
 {
 	uint16_t enq;
 
-	enq = rte_event_eth_tx_adapter_enqueue(dev, port, ev, nb_rx);
+	enq = rte_event_eth_tx_adapter_enqueue(dev, port, ev, nb_rx, 0);
 	while (enq < nb_rx) {
 		enq += rte_event_eth_tx_adapter_enqueue(dev, port,
-				ev + enq, nb_rx - enq);
+				ev + enq, nb_rx - enq, 0);
 	}
 }
 
diff --git a/doc/guides/prog_guide/event_ethernet_tx_adapter.rst b/doc/guides/prog_guide/event_ethernet_tx_adapter.rst
index 192f9e1cf..a8c13e136 100644
--- a/doc/guides/prog_guide/event_ethernet_tx_adapter.rst
+++ b/doc/guides/prog_guide/event_ethernet_tx_adapter.rst
@@ -137,11 +137,12 @@ should use the ``rte_event_enqueue_burst()`` function.
 	if (cap & RTE_EVENT_ETH_TX_ADAPTER_CAP_INTERNAL_PORT) {
 
 		event.mbuf = m;
+		eq_flags = 0;
 
 		m->port = tx_port;
 		rte_event_eth_tx_adapter_txq_set(m, tx_queue_id);
 
-		rte_event_eth_tx_adapter_enqueue(dev_id, ev_port, &event, 1);
+		rte_event_eth_tx_adapter_enqueue(dev_id, ev_port, &event, 1, eq_flags);
 	} else {
 
 		event.queue_id = qid; /* event queue linked to adapter port */
diff --git a/examples/eventdev_pipeline/pipeline_worker_tx.c b/examples/eventdev_pipeline/pipeline_worker_tx.c
index 8961cd656..a0f40c27c 100644
--- a/examples/eventdev_pipeline/pipeline_worker_tx.c
+++ b/examples/eventdev_pipeline/pipeline_worker_tx.c
@@ -40,7 +40,7 @@ worker_tx_pkt(const uint8_t dev, const uint8_t port, struct rte_event *ev)
 {
 	exchange_mac(ev->mbuf);
 	rte_event_eth_tx_adapter_txq_set(ev->mbuf, 0);
-	while (!rte_event_eth_tx_adapter_enqueue(dev, port, ev, 1))
+	while (!rte_event_eth_tx_adapter_enqueue(dev, port, ev, 1, 0))
 		rte_pause();
 }
 
diff --git a/lib/librte_eventdev/rte_event_eth_tx_adapter.h b/lib/librte_eventdev/rte_event_eth_tx_adapter.h
index c848261c4..f552b6023 100644
--- a/lib/librte_eventdev/rte_event_eth_tx_adapter.h
+++ b/lib/librte_eventdev/rte_event_eth_tx_adapter.h
@@ -300,6 +300,11 @@ rte_event_eth_tx_adapter_txq_get(struct rte_mbuf *pkt)
 int
 rte_event_eth_tx_adapter_event_port_get(uint8_t id, uint8_t *event_port_id);
 
+#define RTE_EVENT_ETH_TX_ADAPTER_ENQUEUE_SAME_DEST	0x1
+/**< This flag is used when all the packets enqueued in the tx adapter are
+ * destined for the same Ethernet device, queue pair.
+ */
+
 /**
  * Enqueue a burst of events objects or an event object supplied in *rte_event*
  * structure on an  event device designated by its *dev_id* through the event
@@ -324,6 +329,10 @@ rte_event_eth_tx_adapter_event_port_get(uint8_t id, uint8_t *event_port_id);
  *  The number of event objects to enqueue, typically number of
  *  rte_event_port_attr_get(...RTE_EVENT_PORT_ATTR_ENQ_DEPTH...)
  *  available for this port.
+ * @param flags
+ *  See RTE_EVENT_ETH_TX_ADAPTER_ENQUEUE_ flags.
+ *  #RTE_EVENT_ETH_TX_ADAPTER_ENQUEUE_SAME_DEST signifies that all the packets
+ *  which are enqueued are destined for the same Ethernet device, queue pair.
  *
  * @return
  *   The number of event objects actually enqueued on the event device. The
@@ -343,7 +352,8 @@ static inline uint16_t
 rte_event_eth_tx_adapter_enqueue(uint8_t dev_id,
 				uint8_t port_id,
 				struct rte_event ev[],
-				uint16_t nb_events)
+				uint16_t nb_events,
+				const uint8_t flags)
 {
 	const struct rte_eventdev *dev = &rte_eventdevs[dev_id];
 
@@ -359,7 +369,12 @@ rte_event_eth_tx_adapter_enqueue(uint8_t dev_id,
 		return 0;
 	}
 #endif
-	return dev->txa_enqueue(dev->data->ports[port_id], ev, nb_events);
+	if (flags)
+		return dev->txa_enqueue_same_dest(dev->data->ports[port_id],
+						  ev, nb_events, flags);
+	else
+		return dev->txa_enqueue(dev->data->ports[port_id], ev,
+					nb_events);
 }
 
 /**
diff --git a/lib/librte_eventdev/rte_eventdev.c b/lib/librte_eventdev/rte_eventdev.c
index f44c869cb..7c8ffdfef 100644
--- a/lib/librte_eventdev/rte_eventdev.c
+++ b/lib/librte_eventdev/rte_eventdev.c
@@ -1330,6 +1330,16 @@ rte_event_tx_adapter_enqueue(__rte_unused void *port,
 	return 0;
 }
 
+static uint16_t
+rte_event_tx_adapter_enqueue_same_dest(__rte_unused void *port,
+			__rte_unused struct rte_event ev[],
+			__rte_unused uint16_t nb_events,
+			__rte_unused const uint8_t flags)
+{
+	rte_errno = ENOTSUP;
+	return 0;
+}
+
 struct rte_eventdev *
 rte_event_pmd_allocate(const char *name, int socket_id)
 {
@@ -1351,6 +1361,8 @@ rte_event_pmd_allocate(const char *name, int socket_id)
 	eventdev = &rte_eventdevs[dev_id];
 
 	eventdev->txa_enqueue = rte_event_tx_adapter_enqueue;
+	eventdev->txa_enqueue_same_dest =
+			rte_event_tx_adapter_enqueue_same_dest;
 
 	if (eventdev->data == NULL) {
 		struct rte_eventdev_data *eventdev_data = NULL;
diff --git a/lib/librte_eventdev/rte_eventdev.h b/lib/librte_eventdev/rte_eventdev.h
index 5044a13d0..ea61f52f6 100644
--- a/lib/librte_eventdev/rte_eventdev.h
+++ b/lib/librte_eventdev/rte_eventdev.h
@@ -1230,6 +1230,13 @@ 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 */
 
+typedef uint16_t (*event_tx_adapter_enqueue_same_dest)(void *port,
+		struct rte_event ev[], uint16_t nb_events,
+		const uint8_t flags);
+/**< @internal Enqueue burst of events on port of a device supporting flag to
+ * indicate burst having same dest eth port and queue.
+ */
+
 #define RTE_EVENTDEV_NAME_MAX_LEN	(64)
 /**< @internal Max length of name of event PMD */
 
@@ -1292,6 +1299,8 @@ struct rte_eventdev {
 	/**< Pointer to PMD dequeue function. */
 	event_dequeue_burst_t dequeue_burst;
 	/**< Pointer to PMD dequeue burst function. */
+	event_tx_adapter_enqueue_same_dest txa_enqueue_same_dest;
+	/**< Pointer to PMD eth Tx adapter enqueue burst function. */
 	event_tx_adapter_enqueue txa_enqueue;
 	/**< Pointer to PMD eth Tx adapter enqueue function. */
 	struct rte_eventdev_data *data;
-- 
2.17.1