net/ixgbe: fixed port can not link up in FreeBSD

  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 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
  

Hi,

> 
> 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 | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
> index 2c6fd0f13..e33b5483c 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 +2804,25 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
>  			    "please call hierarchy_commit() "
>  			    "before starting the port");
> 
> +#ifdef RTE_EXEC_ENV_FREEBSD
> +	/*
> +	 * 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.
> +	 */
> +	for (i = 0; i < 25; i++) {
> +		/* If link up, just jump out */
> +		err = ixgbe_check_link(hw, &speed, &link_up, 0);
> +		if (err)
> +			goto error;
> +		if (link_up)
> +			break;
> +		msec_delay(200);
> +	}
> +#endif

Might be better to put it into a separate function to keep start() code clean.
Konstantin

> +
>  	/*
>  	 * Update link status right before return, because it may
>  	 * start link configuration process in a separate thread.
> --
> 2.17.1