[dpdk-dev] [PATCH v2 5/7] net/hns3: fix incorrect timing in resetting queues

[Min Hu (Connor)]

From: Chengchang Tang <tangchengchang at huawei.com>

During the task queue pairs reset, the getimeofday is used to obtain the
timestamp to determine whether the command execution times out. But
gettimeofday is not monotonous, it can be modified by system
administrators, so the timing may not be accurate or even cause the loop
to wait consistently. And actually, in this scenario, it is not necessary
to obain the timestamp.

This patch removes the operation of obtaining the timestamp from the task
queue pairs reset function.

Fixes: bba636698316 ("net/hns3: support Rx/Tx and related operations")
Cc: stable at dpdk.org

Signed-off-by: Chengchang Tang <tangchengchang at huawei.com>
Signed-off-by: Min Hu (Connor) <humin29 at huawei.com>
---
 drivers/net/hns3/hns3_rxtx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 8c5da44..be93618 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -625,8 +625,8 @@ static int
 hns3pf_reset_tqp(struct hns3_hw *hw, uint16_t queue_id)
 {
 #define HNS3_TQP_RESET_TRY_MS	200
+	uint16_t wait_time = 0;
 	uint8_t reset_status;
-	uint64_t end;
 	int ret;
 
 	/*
@@ -639,17 +639,18 @@ hns3pf_reset_tqp(struct hns3_hw *hw, uint16_t queue_id)
 		hns3_err(hw, "Send reset tqp cmd fail, ret = %d", ret);
 		return ret;
 	}
-	end = get_timeofday_ms() + HNS3_TQP_RESET_TRY_MS;
+
 	do {
 		/* Wait for tqp hw reset */
 		rte_delay_ms(HNS3_POLL_RESPONE_MS);
+		wait_time += HNS3_POLL_RESPONE_MS;
 		ret = hns3_get_tqp_reset_status(hw, queue_id, &reset_status);
 		if (ret)
 			goto tqp_reset_fail;
 
 		if (reset_status)
 			break;
-	} while (get_timeofday_ms() < end);
+	} while (wait_time < HNS3_TQP_RESET_TRY_MS);
 
 	if (!reset_status) {
 		ret = -ETIMEDOUT;
-- 
2.7.4