[dpdk-dev] [PATCH v2 7/8] net/hns3: fix HW ring not clear after queue stop

[Lijun Ou]

From: Chengchang Tang <tangchengchang at huawei.com>

Currently, the rx HW ring is not cleared after queue stop.
When there are packets remaining in the HW rings and the
queues have been stopped, if upper layer user calls the
rx_burst function at this time, an illegal memory access
will occur due to the sw rings has been released.

This patch fix this by reset the sw ring after disable the
queue.

Fixes: fa29fe45a7b4 ("net/hns3: support queue start and stop")
Cc: stable at dpdk.org

Signed-off-by: Chengchang Tang <tangchengchang at huawei.com>
Signed-off-by: Lijun Ou <oulijun at huawei.com>
---
 drivers/net/hns3/hns3_rxtx.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 3386453..2988a4b 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -3805,6 +3805,19 @@ hns3_dev_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 	return ret;
 }
 
+static void
+hns3_reset_sw_rxq(struct hns3_rx_queue *rxq)
+{
+	rxq->next_to_use = 0;
+	rxq->rx_rearm_start = 0;
+	rxq->rx_free_hold = 0;
+	rxq->rx_rearm_nb = 0;
+	rxq->pkt_first_seg = NULL;
+	rxq->pkt_last_seg = NULL;
+	memset(&rxq->rx_ring[0], 0, rxq->nb_rx_desc * sizeof(struct hns3_desc));
+	hns3_rxq_vec_setup(rxq);
+}
+
 int
 hns3_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 {
@@ -3815,7 +3828,10 @@ hns3_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		return -ENOTSUP;
 
 	hns3_enable_rxq(rxq, false);
+
 	hns3_rx_queue_release_mbufs(rxq);
+
+	hns3_reset_sw_rxq(rxq);
 	dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
 
 	return 0;
-- 
2.7.4