[PATCH 2/2] net/nfp: fix invalid Rx descriptor data

[Chaoyong He <chaoyong.he@corigine.com>]

From: Long Wu <long.wu@corigine.com>

If the Rx loop is broken and PMD does not update the descriptor, packets
will can not be received successfully.

Fixes: 766d51c9ce29 ("net/nfp: merge receive function")
Cc: chaoyong.he@corigine.com
Cc: stable@dpdk.org

Signed-off-by: Long Wu <long.wu@corigine.com>
Reviewed-by: Chaoyong He <chaoyong.he@corigine.com>
Reviewed-by: Peng Zhang <peng.zhang@corigine.com>
---
 drivers/net/nfp/nfp_rxtx.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/nfp/nfp_rxtx.c b/drivers/net/nfp/nfp_rxtx.c
index 5094bbf145..3840e2372c 100644
--- a/drivers/net/nfp/nfp_rxtx.c
+++ b/drivers/net/nfp/nfp_rxtx.c
@@ -765,15 +765,6 @@ nfp_net_recv_pkts(void *rx_queue,
 		/* Checking the checksum flag */
 		nfp_net_rx_cksum(rxq, rxds, mb);
 
-		if (meta.port_id == 0) {
-			rx_pkts[avail++] = mb;
-		} else if (nfp_flower_pf_dispatch_pkts(hw, mb, meta.port_id)) {
-			avail_multiplexed++;
-		} else {
-			rte_pktmbuf_free(mb);
-			break;
-		}
-
 		/* Now resetting and updating the descriptor */
 		rxds->vals[0] = 0;
 		rxds->vals[1] = 0;
@@ -786,6 +777,15 @@ nfp_net_recv_pkts(void *rx_queue,
 		rxq->rd_p++;
 		if (unlikely(rxq->rd_p == rxq->rx_count)) /* Wrapping */
 			rxq->rd_p = 0;
+
+		if (meta.port_id == 0) {
+			rx_pkts[avail++] = mb;
+		} else if (nfp_flower_pf_dispatch_pkts(hw, mb, meta.port_id)) {
+			avail_multiplexed++;
+		} else {
+			rte_pktmbuf_free(mb);
+			break;
+		}
 	}
 
 	if (nb_hold == 0)
-- 
2.39.1