[dpdk-dev] [PATCH] eventdev: fix Rx SW adapter stop

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

The Rx adapter stop call does not guarantee that the
SW service function will not execute after the
rte_event_eth_rx_adapter_stop() call.

Add a "started" flag to prevent the adapter from executing
if stop has been called.

Fixes: 9c38b704d280 ("eventdev: add eth Rx adapter implementation")
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
CC: stable@dpdk.org
---
 lib/librte_eventdev/rte_event_eth_rx_adapter.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.c b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
index d03f870..7b39e39 100644
--- a/lib/librte_eventdev/rte_event_eth_rx_adapter.c
+++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
@@ -91,6 +91,8 @@ struct rte_event_eth_rx_adapter {
 	int socket_id;
 	/* Per adapter EAL service */
 	uint32_t service_id;
+	/* Adapter started flag */
+	uint8_t rxa_started;
 } __rte_cache_aligned;
 
 /* Per eth device */
@@ -556,6 +558,10 @@ static uint16_t gcd_u16(uint16_t a, uint16_t b)
 
 	if (rte_spinlock_trylock(&rx_adapter->rx_lock) == 0)
 		return 0;
+	if (!rx_adapter->rxa_started) {
+		return 0;
+		rte_spinlock_unlock(&rx_adapter->rx_lock);
+	}
 	eth_rx_poll(rx_adapter);
 	rte_spinlock_unlock(&rx_adapter->rx_lock);
 	return 0;
@@ -847,8 +853,12 @@ static int add_rx_queue(struct rte_event_eth_rx_adapter *rx_adapter,
 						&rte_eth_devices[i]);
 	}
 
-	if (use_service)
+	if (use_service) {
+		rte_spinlock_lock(&rx_adapter->rx_lock);
+		rx_adapter->rxa_started = start;
 		rte_service_runstate_set(rx_adapter->service_id, start);
+		rte_spinlock_unlock(&rx_adapter->rx_lock);
+	}
 
 	return 0;
 }
-- 
1.8.3.1