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

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

-----Original Message-----
> Date: Mon, 4 Jun 2018 18:25:17 +0530
> From: Nikhil Rao <nikhil.rao@intel.com>
> To: jerin.jacob@caviumnetworks.com
> CC: dev@dpdk.org, Nikhil Rao <nikhil.rao@intel.com>, stable@dpdk.org
> Subject: [PATCH] eventdev: fix Rx SW adapter stop
> X-Mailer: git-send-email 1.8.3.1
> 
> 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

Applied to dpdk-next-eventdev/master. Thanks.

> ---
>  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
>