[dpdk-stable] [PATCH] net/ixgbe: fixed port can not link up in FreeBSD

[Lunyuan Cui <lunyuanx.cui@intel.com>]

In FreeBSD environment, nic_uio drivers do not support interrupts,
rte_intr_callback_register() will fail to register interrupts.
We can not make link status to change from
down to up by interrupt callback.
So we need to wait for the controller to
acquire link when ports start.
Through multiple tests, 5s should be enough.

Fixes: b9bd0f09fa15 ("ethdev: fix link status query")
Cc: stable@dpdk.org

Signed-off-by: Lunyuan Cui <lunyuanx.cui@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 2c6fd0f13..3023ee052 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -2555,6 +2555,9 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 		IXGBE_DEV_PRIVATE_TO_TM_CONF(dev->data->dev_private);
 	struct ixgbe_macsec_setting *macsec_setting =
 		IXGBE_DEV_PRIVATE_TO_MACSEC_SETTING(dev->data->dev_private);
+#ifdef RTE_EXEC_ENV_FREEBSD
+	int i;
+#endif
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -2801,6 +2804,27 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 			    "please call hierarchy_commit() "
 			    "before starting the port");
 
+	/*
+	 * In freebsd environment, nic_uio drivers do not support interrupts,
+	 * rte_intr_callback_register() will fail to register interrupts.
+	 * We can not make link status to change
+	 * from down to up by interrupt callback.
+	 * So we need to wait for the controller
+	 * to acquire link when ports start.
+	 */
+#ifdef RTE_EXEC_ENV_FREEBSD
+	for (i = 0; i < 25; i++) {
+		/* If we have link, just jump out */
+		err = ixgbe_check_link(hw, &speed, &link_up, 0);
+		if (err)
+			goto error;
+		if (link_up)
+			break;
+		/* Wait for the link partner to also set speed */
+		msec_delay(200);
+	}
+#endif
+
 	/*
 	 * Update link status right before return, because it may
 	 * start link configuration process in a separate thread.
-- 
2.17.1