[PATCH v2 05/11] net/hns3: fix mbuf leak when start rxq in resetting

[Dongdong Liu <liudongdong3@huawei.com>]

From: Chengwen Feng <fengchengwen@huawei.com>

In the reset restore-conf phase, the reset process will allocate for
the Rx ring mbufs unconditionlly.

And the rte_eth_dev_rx_queue_start() will also allocate for the Rx ring
mbufs unconditionlly.

So if the rte_eth_dev_rx_queue_start() is invoked before restore-conf
phase, then the mbufs allocated by rte_eth_dev_rx_queue_start() will
leak.

Because the hw->reset.resetting was always true during the phases from
stop-service to restore-conf, so fix it by returning an error if the
hw->reset.resetting is set.

This patch adds the above logic in both rx_queue_start/rx_queue_stop/
tx_queue_start/tx_queue_stop ops.

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

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
 drivers/net/hns3/hns3_rxtx.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 6468da903e..2bfc5507e3 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -4523,6 +4523,13 @@ hns3_dev_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		return -ENOTSUP;
 
 	rte_spinlock_lock(&hw->lock);
+
+	if (__atomic_load_n(&hw->reset.resetting, __ATOMIC_RELAXED)) {
+		hns3_err(hw, "fail to start Rx queue during resetting.");
+		rte_spinlock_unlock(&hw->lock);
+		return -EIO;
+	}
+
 	ret = hns3_reset_queue(hw, rx_queue_id, HNS3_RING_TYPE_RX);
 	if (ret) {
 		hns3_err(hw, "fail to reset Rx queue %u, ret = %d.",
@@ -4569,6 +4576,13 @@ hns3_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		return -ENOTSUP;
 
 	rte_spinlock_lock(&hw->lock);
+
+	if (__atomic_load_n(&hw->reset.resetting, __ATOMIC_RELAXED)) {
+		hns3_err(hw, "fail to stop Rx queue during resetting.");
+		rte_spinlock_unlock(&hw->lock);
+		return -EIO;
+	}
+
 	hns3_enable_rxq(rxq, false);
 
 	hns3_rx_queue_release_mbufs(rxq);
@@ -4591,6 +4605,13 @@ hns3_dev_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id)
 		return -ENOTSUP;
 
 	rte_spinlock_lock(&hw->lock);
+
+	if (__atomic_load_n(&hw->reset.resetting, __ATOMIC_RELAXED)) {
+		hns3_err(hw, "fail to start Tx queue during resetting.");
+		rte_spinlock_unlock(&hw->lock);
+		return -EIO;
+	}
+
 	ret = hns3_reset_queue(hw, tx_queue_id, HNS3_RING_TYPE_TX);
 	if (ret) {
 		hns3_err(hw, "fail to reset Tx queue %u, ret = %d.",
@@ -4617,6 +4638,13 @@ hns3_dev_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
 		return -ENOTSUP;
 
 	rte_spinlock_lock(&hw->lock);
+
+	if (__atomic_load_n(&hw->reset.resetting, __ATOMIC_RELAXED)) {
+		hns3_err(hw, "fail to stop Tx queue during resetting.");
+		rte_spinlock_unlock(&hw->lock);
+		return -EIO;
+	}
+
 	hns3_enable_txq(txq, false);
 	hns3_tx_queue_release_mbufs(txq);
 	/*
-- 
2.22.0