[dpdk-stable] [PATCH 2/3] net/pcap: fix transmit return count in error conditions

[David Marchand <david.marchand@redhat.com>]

When a packet cannot be transmitted, the driver is supposed to free this
packet and report it as handled.
This is to prevent the application from retrying to send the same packet
and ending up in a liveloop since the driver will never manage to send
it.

Fixes: 49a0a2ffd5db ("net/pcap: fix possible mbuf double freeing")
Fixes: 6db141c91e1f ("pcap: support jumbo frames")
CC: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/pcap/rte_eth_pcap.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c
index 470867d..5e5aab7 100644
--- a/drivers/net/pcap/rte_eth_pcap.c
+++ b/drivers/net/pcap/rte_eth_pcap.c
@@ -354,7 +354,8 @@ struct pmd_devargs_all {
 					mbuf->pkt_len,
 					RTE_ETHER_MAX_JUMBO_FRAME_LEN);
 
-				break;
+				rte_pktmbuf_free(mbuf);
+				continue;
 			}
 		}
 
@@ -373,7 +374,7 @@ struct pmd_devargs_all {
 	dumper_q->tx_stat.bytes += tx_bytes;
 	dumper_q->tx_stat.err_pkts += nb_pkts - num_tx;
 
-	return num_tx;
+	return nb_pkts;
 }
 
 /*
@@ -439,14 +440,15 @@ struct pmd_devargs_all {
 					mbuf->pkt_len,
 					RTE_ETHER_MAX_JUMBO_FRAME_LEN);
 
-				break;
+				rte_pktmbuf_free(mbuf);
+				continue;
 			}
 		}
 
-		if (unlikely(ret != 0))
-			break;
-		num_tx++;
-		tx_bytes += mbuf->pkt_len;
+		if (ret == 0) {
+			num_tx++;
+			tx_bytes += mbuf->pkt_len;
+		}
 		rte_pktmbuf_free(mbuf);
 	}
 
@@ -454,7 +456,7 @@ struct pmd_devargs_all {
 	tx_queue->tx_stat.bytes += tx_bytes;
 	tx_queue->tx_stat.err_pkts += nb_pkts - num_tx;
 
-	return num_tx;
+	return nb_pkts;
 }
 
 /*
-- 
1.8.3.1