[dpdk-stable] [17.11] net/tap: fix reported number of Tx packets

[Raslan Darawsheh <rasland@mellanox.com>]

When writev fails to send packets it doesn't update the
number of Tx packets, but it still num_tx is updated.

The value that should be returned is the actual number
of sent packets which is num_packets.

Fixes: 02f96a0a82d1 ("net/tap: add TUN/TAP device PMD")
CC: stable@dpdk.org

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
Acked-by: Keith Wiles <keith.wiles@intel.com>
---
 drivers/net/tap/rte_eth_tap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 466624a..50757ef 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -488,7 +488,7 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	txq->stats.errs += nb_pkts - num_tx;
 	txq->stats.obytes += num_tx_bytes;
 
-	return num_tx;
+	return num_packets;
 }
 
 static const char *
-- 
2.7.4