[dpdk-dev] [PATCH 06/10] net/hns3: fix flow counter not cleared when create

["Min Hu (Connor)" <humin29@huawei.com>]

From: Chengwen Feng <fengchengwen@huawei.com>

User could create flow rules with specified counter by the action of
RTE_FLOW_ACTION_TYPE_COUNT, but the counter may retain the original
value when create.

This patch fix the bug by read the counter when creating the rule
because the counter is read-clear.

Fixes: fcba820d9b9e ("net/hns3: support flow director")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/net/hns3/hns3_flow.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/hns3/hns3_flow.c b/drivers/net/hns3/hns3_flow.c
index 0c4e911..84ab819 100644
--- a/drivers/net/hns3/hns3_flow.c
+++ b/drivers/net/hns3/hns3_flow.c
@@ -158,7 +158,10 @@ hns3_counter_new(struct rte_eth_dev *dev, uint32_t shared, uint32_t id,
 {
 	struct hns3_adapter *hns = dev->data->dev_private;
 	struct hns3_pf *pf = &hns->pf;
+	struct hns3_hw *hw = &hns->hw;
 	struct hns3_flow_counter *cnt;
+	uint64_t value;
+	int ret;
 
 	cnt = hns3_counter_lookup(dev, id);
 	if (cnt) {
@@ -171,6 +174,13 @@ hns3_counter_new(struct rte_eth_dev *dev, uint32_t shared, uint32_t id,
 		return 0;
 	}
 
+	/* Clear the counter by read ops because the counter is read-clear */
+	ret = hns3_get_count(hw, id, &value);
+	if (ret)
+		return rte_flow_error_set(error, EIO,
+					  RTE_FLOW_ERROR_TYPE_HANDLE, NULL,
+					  "Clear counter failed!");
+
 	cnt = rte_zmalloc("hns3 counter", sizeof(*cnt), 0);
 	if (cnt == NULL)
 		return rte_flow_error_set(error, ENOMEM,
-- 
2.7.4