[dpdk-dev] eventdev: fix missing update to Rx adaper WRR position

  After dequeuing Rx packets and enqueueing them to the
temporary buffer towards eventdev, the packet Rx loop exits
if the temporary buffer is full but the current WRR position
is not saved.

Save away the current value of the WRR position, so packets
are dequeued from the correct Rx queue in the next invocation.

Fixes: 9c38b704d280 ("eventdev: add eth Rx adapter implementation")
Suggested-by: Gage Eads <gage.eads@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Cc: stable@dpdk.org
---
 lib/librte_eventdev/rte_event_eth_rx_adapter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
  

-----Original Message-----
> Date: Sun, 3 Jun 2018 17:11:08 +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 missing update to Rx adaper WRR position
> X-Mailer: git-send-email 1.8.3.1
> 
> After dequeuing Rx packets and enqueueing them to the
> temporary buffer towards eventdev, the packet Rx loop exits
> if the temporary buffer is full but the current WRR position
> is not saved.
> 
> Save away the current value of the WRR position, so packets
> are dequeued from the correct Rx queue in the next invocation.
> 
> Fixes: 9c38b704d280 ("eventdev: add eth Rx adapter implementation")
> Suggested-by: Gage Eads <gage.eads@intel.com>
> 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 | 4 +++-
>  1 file changed, 3 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 6f70509..53a3788 100644
> --- a/lib/librte_eventdev/rte_event_eth_rx_adapter.c
> +++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.c
> @@ -517,8 +517,10 @@ static uint16_t gcd_u16(uint16_t a, uint16_t b)
>  		 */
>  		if (buf->count >= BATCH_SIZE)
>  			flush_event_buffer(rx_adapter);
> -		if (BATCH_SIZE > (ETH_EVENT_BUFFER_SIZE - buf->count))
> +		if (BATCH_SIZE > (ETH_EVENT_BUFFER_SIZE - buf->count)) {
> +			rx_adapter->wrr_pos = wrr_pos;
>  			break;
> +		}
>  
>  		stats->rx_poll_count++;
>  		n = rte_eth_rx_burst(d, qid, mbufs, BATCH_SIZE);
> -- 
> 1.8.3.1
>