[PATCH v4 1/2] net/ice: fix scalar Rx path segment

[Mingjin Ye <mingjinx.ye@intel.com>]

CRC is stripped by the hardware in the scattered Rx path. The last buffer
is invalid if it's packet length is zero.

This patch adds a judgment for the last buffer length to fix this issue,
it would free the mbuf associated to the last one if the last buffer is
empty.

Fixes: 6eac0b7fde95 ("net/ice: support advance Rx/Tx")
Cc: stable@dpdk.org

Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
---
 drivers/net/ice/ice_rxtx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 0a2b0376ac..e6ddd2513d 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -2111,6 +2111,10 @@ ice_recv_scattered_pkts(void *rx_queue,
 			} else
 				rxm->data_len = (uint16_t)(rx_packet_len -
 							   RTE_ETHER_CRC_LEN);
+		} else if (rx_packet_len == 0) {
+			rte_pktmbuf_free_seg(rxm);
+			first_seg->nb_segs--;
+			last_seg->next = NULL;
 		}
 
 		first_seg->port = rxq->port_id;
-- 
2.34.1