[dpdk-dev] [PATCH v3 04/23] net/dpaa: 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 DPAA 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 statusand does not support link status
interrupt.

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

Fixes: 2aa10990a8dd ("bus/dpaa: enable link state interrupt")
Cc: stable@dpdk.org

Signed-off-by: Rohit Raj <rohit.raj@nxp.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
 drivers/net/dpaa/dpaa_ethdev.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dpaa/dpaa_ethdev.c b/drivers/net/dpaa/dpaa_ethdev.c
index d643514de6..c59873dd8a 100644
--- a/drivers/net/dpaa/dpaa_ethdev.c
+++ b/drivers/net/dpaa/dpaa_ethdev.c
@@ -49,6 +49,9 @@
 #include <process.h>
 #include <fmlib/fm_ext.h>
 
+#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 =
 		DEV_RX_OFFLOAD_JUMBO_FRAME |
@@ -669,23 +672,30 @@ dpaa_dev_tx_burst_mode_get(struct rte_eth_dev *dev,
 }
 
 static int dpaa_eth_link_update(struct rte_eth_dev *dev,
-				int wait_to_complete __rte_unused)
+				int wait_to_complete)
 {
 	struct dpaa_if *dpaa_intf = dev->data->dev_private;
 	struct rte_eth_link *link = &dev->data->dev_link;
 	struct fman_if *fif = dev->process_private;
 	struct __fman_if *__fif = container_of(fif, struct __fman_if, __if);
 	int ret, ioctl_version;
+	uint8_t count;
 
 	PMD_INIT_FUNC_TRACE();
 
 	ioctl_version = dpaa_get_ioctl_version_number();
 
-
 	if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
-		ret = dpaa_get_link_status(__fif->node_name, link);
-		if (ret)
-			return ret;
+		for (count = 0; count <= MAX_REPEAT_TIME; count++) {
+			ret = dpaa_get_link_status(__fif->node_name, link);
+			if (ret)
+				return ret;
+			if (link->link_status == ETH_LINK_DOWN &&
+			    wait_to_complete)
+				rte_delay_ms(CHECK_INTERVAL);
+			else
+				break;
+		}
 	} else {
 		link->link_status = dpaa_intf->valid;
 	}
-- 
2.17.1