[dpdk-dev] [PATCH v4 3/5] eventdev: move Rx adapter eth Rx to separate function

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

Create a separate function that handles eth receive and
enqueue to event buffer. This function will also be called for
interrupt driven receive queues.

Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---
 lib/librte_eventdev/rte_event_eth_rx_adapter.c | 67 ++++++++++++++++++--------
 1 file changed, 47 insertions(+), 20 deletions(-)

diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.c b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
index 926f83a..8fe037f 100644
--- a/lib/librte_eventdev/rte_event_eth_rx_adapter.c
+++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
@@ -616,6 +616,45 @@ static uint16_t rxa_gcd_u16(uint16_t a, uint16_t b)
 	}
 }
 
+/* Enqueue packets from  <port, q>  to event buffer */
+static inline uint32_t
+rxa_eth_rx(struct rte_event_eth_rx_adapter *rx_adapter,
+	uint16_t port_id,
+	uint16_t queue_id,
+	uint32_t rx_count,
+	uint32_t max_rx)
+{
+	struct rte_mbuf *mbufs[BATCH_SIZE];
+	struct rte_eth_event_enqueue_buffer *buf =
+					&rx_adapter->event_enqueue_buffer;
+	struct rte_event_eth_rx_adapter_stats *stats =
+					&rx_adapter->stats;
+	uint16_t n;
+	uint32_t nb_rx = 0;
+
+	/* Don't do a batch dequeue from the rx queue if there isn't
+	 * enough space in the enqueue buffer.
+	 */
+	while (BATCH_SIZE <= (RTE_DIM(buf->events) - buf->count)) {
+		if (buf->count >= BATCH_SIZE)
+			rxa_flush_event_buffer(rx_adapter);
+
+		stats->rx_poll_count++;
+		n = rte_eth_rx_burst(port_id, queue_id, mbufs, BATCH_SIZE);
+		if (unlikely(!n))
+			break;
+		rxa_buffer_mbufs(rx_adapter, port_id, queue_id, mbufs, n);
+		nb_rx += n;
+		if (rx_count + nb_rx > max_rx)
+			break;
+	}
+
+	if (buf->count >= BATCH_SIZE)
+		rxa_flush_event_buffer(rx_adapter);
+
+	return nb_rx;
+}
+
 /*
  * Polls receive queues added to the event adapter and enqueues received
  * packets to the event device.
@@ -633,17 +672,16 @@ static uint16_t rxa_gcd_u16(uint16_t a, uint16_t b)
 rxa_poll(struct rte_event_eth_rx_adapter *rx_adapter)
 {
 	uint32_t num_queue;
-	uint16_t n;
 	uint32_t nb_rx = 0;
-	struct rte_mbuf *mbufs[BATCH_SIZE];
 	struct rte_eth_event_enqueue_buffer *buf;
 	uint32_t wrr_pos;
 	uint32_t max_nb_rx;
+	struct rte_event_eth_rx_adapter_stats *stats;
 
 	wrr_pos = rx_adapter->wrr_pos;
 	max_nb_rx = rx_adapter->max_nb_rx;
 	buf = &rx_adapter->event_enqueue_buffer;
-	struct rte_event_eth_rx_adapter_stats *stats = &rx_adapter->stats;
+	stats = &rx_adapter->stats;
 
 	/* Iterate through a WRR sequence */
 	for (num_queue = 0; num_queue < rx_adapter->wrr_len; num_queue++) {
@@ -658,32 +696,21 @@ static uint16_t rxa_gcd_u16(uint16_t a, uint16_t b)
 			rxa_flush_event_buffer(rx_adapter);
 		if (BATCH_SIZE > (ETH_EVENT_BUFFER_SIZE - buf->count)) {
 			rx_adapter->wrr_pos = wrr_pos;
-			return;
+			break;
 		}
 
-		stats->rx_poll_count++;
-		n = rte_eth_rx_burst(d, qid, mbufs, BATCH_SIZE);
-
-		if (n) {
-			stats->rx_packets += n;
-			/* The check before rte_eth_rx_burst() ensures that
-			 * all n mbufs can be buffered
-			 */
-			rxa_buffer_mbufs(rx_adapter, d, qid, mbufs, n);
-			nb_rx += n;
-			if (nb_rx > max_nb_rx) {
-				rx_adapter->wrr_pos =
+		nb_rx += rxa_eth_rx(rx_adapter, d, qid, nb_rx, max_nb_rx);
+		if (nb_rx > max_nb_rx) {
+			rx_adapter->wrr_pos =
 				    (wrr_pos + 1) % rx_adapter->wrr_len;
-				break;
-			}
+			break;
 		}
 
 		if (++wrr_pos == rx_adapter->wrr_len)
 			wrr_pos = 0;
 	}
 
-	if (buf->count >= BATCH_SIZE)
-		rxa_flush_event_buffer(rx_adapter);
+	stats->rx_packets += nb_rx;
 }
 
 static int
-- 
1.8.3.1