Re: [dpdk-dev] [PATCH v2] net/mlx5: fix link status initialization

["Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>]

On Tue, Apr 10, 2018 at 09:13:36AM +0300, Shahaf Shuler wrote:
> Following commit 7ba5320baa32 ("net/mlx5: fix link status behavior")
> The initial link status is no longer set as part of the port start.
> 
> When LSC interrupts are enabled, ethdev layer reads the link status
> directly from the device data instead of using the PMD callback.
> This may cause application to query the link as down while in fact it was
> already up before the DPDK application start (and no interrupt to fix
> it).
> 
> Fixes: 7ba5320baa32 ("net/mlx5: fix link status behavior")
> Cc: nelio.laranjeiro@6wind.com
> 
> Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
> Acked-by: Yongseok Koh <yskoh@mellanox.com>
> ---
> 
> On v2:
>  - Reworded commit log.
>  - Cleared the wait_to_complete on the link update call.
> 
> ---
>  drivers/net/mlx5/mlx5.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
> index cfab558979..3d222df707 100644
> --- a/drivers/net/mlx5/mlx5.c
> +++ b/drivers/net/mlx5/mlx5.c
> @@ -991,6 +991,12 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
>  		DRV_LOG(DEBUG, "port %u forcing Ethernet interface up",
>  			eth_dev->data->port_id);
>  		mlx5_set_link_up(eth_dev);
> +		/*
> +		 * Even though the interrupt handler is not installed yet,
> +		 * interrupts will still trigger on the asyn_fd from
> +		 * Verbs context returned by ibv_open_device().
> +		 */
> +		mlx5_link_update(eth_dev, 0);
>  		/* Store device configuration on private structure. */
>  		priv->config = config;
>  		continue;
> -- 
> 2.12.0

You should have linked this patch with the ethdev one[1], if the ethdev is
refused, this patch won't solve anything.

With a reserves of acceptance of [1]: 
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

Thanks,

[1] https://dpdk.org/ml/archives/dev/2018-April/096387.html
-- 
Nélio Laranjeiro
6WIND