netdev - Re: [net-next 05/11] i40e: fix for queue timing delays

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Message-ID: <6f47c4cb-c345-99f9-aabd-eec274ecfbcf@cogentembedded.com>
Date:   Sat, 25 Mar 2017 13:31:42 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
Cc:     Carolyn Wyborny <carolyn.wyborny@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jogreene@...hat.com
Subject: Re: [net-next 05/11] i40e: fix for queue timing delays

On 3/25/2017 11:12 AM, Jeff Kirsher wrote:

> From: Carolyn Wyborny <carolyn.wyborny@...el.com>
>
> This patch adds a delay to Rx queue disables to accommodate HW needs.
>
> Change-ID: I2864ca667ce5dcc2cc44f8718113b719742a46a1
> Signed-off-by: Carolyn Wyborny <carolyn.wyborny@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 5da990909a88..1435033faefe 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -4181,6 +4181,8 @@ static int i40e_vsi_control_rx(struct i40e_vsi *vsi, bool enable)
>  		}
>  	}
>
> +	/* HW needs up to 50ms to finish RX queue disable*/

    Please add a space before */.

> +	mdelay(50);

    Ugh...

>  	return ret;
>  }

MBR, Sergei