net/af_packet: fix packet bytes counting

On error, we also need to zero the bytes transmitted.

Fixes: f4ff17a ("net/af_packet: guard against buffer overruns in Tx path")
Cc: stable@dpdk.org

Signed-off-by: Chas Williams <ciwillia@brocade.com>

drivers/net/af_packet/rte_eth_af_packet.c

@@ -252,8 +252,11 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	}
 
 	/* kick-off transmits */
-	if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1)
-		num_tx = 0; /* error sending -- no packets transmitted */
+	if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1) {
+		/* error sending -- no packets transmitted */
+		num_tx = 0;
+		num_tx_bytes = 0;
+	}
 
 	pkt_q->framenum = framenum;
 	pkt_q->tx_pkts += num_tx;