[dpdk-stable] [PATCH v3 03/23] net/dpaa2: fix link get API implementation

[Hemant Agrawal <hemant.agrawal@nxp.com>]

From: Rohit Raj <rohit.raj@nxp.com>

According to DPDK Documentation, rte_eth_link_get API can wait up to 9
seconds for auto-negotiation to finish and then returns link status.

In current implementation of rte_eth_link_get API in DPAA2 drivers, it
was not waiting for auto negotiation to finish and was returning link
status DOWN
It can cause issues with DPDK applications which relies on
rte_eth_link_get API for link status and does not support link status
interrupt.
Similar kind of issue was seen in TRex Application.

This patch fixes this bug by adding wait for up to 9 seconds for auto
negotiation to finish.

Fixes: c56c86ff87c1 ("net/dpaa2: update link status")
Cc: stable@dpdk.org

Signed-off-by: Rohit Raj <rohit.raj@nxp.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
 drivers/net/dpaa2/dpaa2_ethdev.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dpaa2/dpaa2_ethdev.c b/drivers/net/dpaa2/dpaa2_ethdev.c
index 38774e255b..a81c73438e 100644
--- a/drivers/net/dpaa2/dpaa2_ethdev.c
+++ b/drivers/net/dpaa2/dpaa2_ethdev.c
@@ -31,6 +31,8 @@
 
 #define DRIVER_LOOPBACK_MODE "drv_loopback"
 #define DRIVER_NO_PREFETCH_MODE "drv_no_prefetch"
+#define CHECK_INTERVAL         100  /* 100ms */
+#define MAX_REPEAT_TIME        90   /* 9s (90 * 100ms) in total */
 
 /* Supported Rx offloads */
 static uint64_t dev_rx_offloads_sup =
@@ -1805,23 +1807,32 @@ dpaa2_dev_stats_reset(struct rte_eth_dev *dev)
 /* return 0 means link status changed, -1 means not changed */
 static int
 dpaa2_dev_link_update(struct rte_eth_dev *dev,
-			int wait_to_complete __rte_unused)
+		      int wait_to_complete)
 {
 	int ret;
 	struct dpaa2_dev_priv *priv = dev->data->dev_private;
 	struct fsl_mc_io *dpni = (struct fsl_mc_io *)dev->process_private;
 	struct rte_eth_link link;
 	struct dpni_link_state state = {0};
+	uint8_t count;
 
 	if (dpni == NULL) {
 		DPAA2_PMD_ERR("dpni is NULL");
 		return 0;
 	}
 
-	ret = dpni_get_link_state(dpni, CMD_PRI_LOW, priv->token, &state);
-	if (ret < 0) {
-		DPAA2_PMD_DEBUG("error: dpni_get_link_state %d", ret);
-		return -1;
+	for (count = 0; count <= MAX_REPEAT_TIME; count++) {
+		ret = dpni_get_link_state(dpni, CMD_PRI_LOW, priv->token,
+					  &state);
+		if (ret < 0) {
+			DPAA2_PMD_DEBUG("error: dpni_get_link_state %d", ret);
+			return -1;
+		}
+		if (state.up == ETH_LINK_DOWN &&
+		    wait_to_complete)
+			rte_delay_ms(CHECK_INTERVAL);
+		else
+			break;
 	}
 
 	memset(&link, 0, sizeof(struct rte_eth_link));
-- 
2.17.1