From: Nikhil Rao <nikhil.rao@intel.com>
Date: Sun, 3 Jun 2018 12:42:25 +0000 (+0530)
Subject: eventdev: add event buffer flush in Rx adapter
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=6b83f5935543;p=dpdk.git

eventdev: add event buffer flush in Rx adapter

Add an event buffer flush when the current invocation
of the Rx adapter is completed.

This patch provides lower latency in case there is a
BATCH_SIZE of events in the event buffer.

Cc: stable@dpdk.org

Suggested-by: Narender Vangati <narender.vangati@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---

diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.c b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
index c2b5d4d83a..e353424ce8 100644
--- a/lib/librte_eventdev/rte_event_eth_rx_adapter.c
+++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
@@ -490,7 +490,7 @@ fill_event_buffer(struct rte_event_eth_rx_adapter *rx_adapter,
  * the hypervisor's switching layer where adjustments can be made to deal with
  * it.
  */
-static inline uint32_t
+static inline void
 eth_rx_poll(struct rte_event_eth_rx_adapter *rx_adapter)
 {
 	uint32_t num_queue;
@@ -519,7 +519,7 @@ eth_rx_poll(struct rte_event_eth_rx_adapter *rx_adapter)
 			flush_event_buffer(rx_adapter);
 		if (BATCH_SIZE > (ETH_EVENT_BUFFER_SIZE - buf->count)) {
 			rx_adapter->wrr_pos = wrr_pos;
-			break;
+			return;
 		}
 
 		stats->rx_poll_count++;
@@ -535,7 +535,7 @@ eth_rx_poll(struct rte_event_eth_rx_adapter *rx_adapter)
 			if (nb_rx > max_nb_rx) {
 				rx_adapter->wrr_pos =
 				    (wrr_pos + 1) % rx_adapter->wrr_len;
-				return nb_rx;
+				break;
 			}
 		}
 
@@ -543,20 +543,18 @@ eth_rx_poll(struct rte_event_eth_rx_adapter *rx_adapter)
 			wrr_pos = 0;
 	}
 
-	return nb_rx;
+	if (buf->count >= BATCH_SIZE)
+		flush_event_buffer(rx_adapter);
 }
 
 static int
 event_eth_rx_adapter_service_func(void *args)
 {
 	struct rte_event_eth_rx_adapter *rx_adapter = args;
-	struct rte_eth_event_enqueue_buffer *buf;
 
-	buf = &rx_adapter->event_enqueue_buffer;
 	if (rte_spinlock_trylock(&rx_adapter->rx_lock) == 0)
 		return 0;
-	if (eth_rx_poll(rx_adapter) == 0 && buf->count)
-		flush_event_buffer(rx_adapter);
+	eth_rx_poll(rx_adapter);
 	rte_spinlock_unlock(&rx_adapter->rx_lock);
 	return 0;
 }