net/fm10k: fix mbuf free in vector Rx

  There's a corner case that all the Rx queue mbufs are allocated but none
of them is used, this patch fixes mbuf free for this case.

Fixes: b6719f8a04bb ("fm10k: release mbuf for vector Rx")
Cc: stable@dpdk.org

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Signed-off-by: Anna Lukin <annal@silicom.co.il>
---
 drivers/net/fm10k/fm10k_rxtx_vec.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
  

On 10/25, Xiao Wang wrote:
>There's a corner case that all the Rx queue mbufs are allocated but none
>of them is used, this patch fixes mbuf free for this case.
>
>Fixes: b6719f8a04bb ("fm10k: release mbuf for vector Rx")
>Cc: stable@dpdk.org
>
>Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
>Signed-off-by: Anna Lukin <annal@silicom.co.il>
>---
> drivers/net/fm10k/fm10k_rxtx_vec.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/fm10k/fm10k_rxtx_vec.c b/drivers/net/fm10k/fm10k_rxtx_vec.c
>index 45542bef3..d76dfd16f 100644
>--- a/drivers/net/fm10k/fm10k_rxtx_vec.c
>+++ b/drivers/net/fm10k/fm10k_rxtx_vec.c
>@@ -359,8 +359,15 @@ fm10k_rx_queue_release_mbufs_vec(struct fm10k_rx_queue *rxq)
> 		return;
> 
> 	/* free all mbufs that are valid in the ring */
>-	for (i = rxq->next_dd; i != rxq->rxrearm_start; i = (i + 1) & mask)
>-		rte_pktmbuf_free_seg(rxq->sw_ring[i]);
>+	if (rxq->rxrearm_nb == 0) {
>+		for (i = 0; i < rxq->nb_desc; i++)
>+			if (rxq->sw_ring[i] != NULL)
>+				rte_pktmbuf_free_seg(rxq->sw_ring[i]);
>+	} else {
>+		for (i = rxq->next_dd; i != rxq->rxrearm_start;
>+				i = (i + 1) & mask)
>+			rte_pktmbuf_free_seg(rxq->sw_ring[i]);
>+	}
> 	rxq->rxrearm_nb = rxq->nb_desc;
> 
> 	/* set all entries to NULL */
>-- 
>2.15.1
>

Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>

Applied to dpdk-next-net-intel. Thanks.