[dpdk-dev] [PATCH] net/hns3: support wait to complete in link update API

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

From: Huisong Li <lihuisong@huawei.com>

There are two APIs in ethdev layer to get link status of device, namely,
"rte_eth_link_get" and "rte_eth_link_get_nowait". When the device link
is unstable or auto-negotiation is in progress, the first API supports
the function of waiting for the NIC to link up, and the maximum waiting
time is 9 seconds based on DPDK Documentation. For the hns3 PMD driver,
the link can be established within 2 seconds.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/net/hns3/hns3_ethdev.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index 9c71808..4883cb7 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -2741,19 +2741,31 @@ hns3_setup_linkstatus(struct rte_eth_dev *eth_dev,
 }
 
 static int
-hns3_dev_link_update(struct rte_eth_dev *eth_dev,
-		     __rte_unused int wait_to_complete)
+hns3_dev_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete)
 {
+#define HNS3_LINK_CHECK_INTERVAL 100  /* 100ms */
+#define HNS3_MAX_LINK_CHECK_TIMES 20  /* 2s (100 * 20ms) in total */
+
 	struct hns3_hw *hw = HNS3_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
+	uint32_t retry_cnt = HNS3_MAX_LINK_CHECK_TIMES;
 	struct hns3_mac *mac = &hw->mac;
 	struct rte_eth_link new_link;
 	int ret;
 
-	ret = hns3_update_port_link_info(eth_dev);
-	if (ret) {
-		mac->link_status = ETH_LINK_DOWN;
-		hns3_err(hw, "failed to get port link info, ret = %d.", ret);
-	}
+	do {
+		ret = hns3_update_port_link_info(eth_dev);
+		if (ret) {
+			mac->link_status = ETH_LINK_DOWN;
+			hns3_err(hw, "failed to get port link info, ret = %d.",
+				 ret);
+			break;
+		}
+
+		if (!wait_to_complete || mac->link_status == ETH_LINK_UP)
+			break;
+
+		rte_delay_ms(HNS3_LINK_CHECK_INTERVAL);
+	} while (retry_cnt--);
 
 	memset(&new_link, 0, sizeof(new_link));
 	hns3_setup_linkstatus(eth_dev, &new_link);
-- 
2.7.4