linux-kernel - Re: [PATCH] IB/mlx5: give back valid speed/width even without plugged in SFP module

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Date:   Fri, 27 Oct 2017 22:35:06 +0300
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Thomas Bogendoerfer <tbogendoerfer@...e.de>
Cc:     Matan Barak <matanb@...lanox.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/mlx5: give back valid speed/width even without
 plugged in SFP module

On Fri, Oct 27, 2017 at 02:30:11PM +0200, Thomas Bogendoerfer wrote:
> If there is no SFP module plugged into a port of mlx5 cards
> 'cat /sys/class/infniband/mlx5_X/ports/1/rate' returns Invalid argument.
> This causes tools like 'ibstat' to malfunction. This change adjusts mlx5
> to all other RoCE/iWarp drivers, which always return valid speed/width.

Like Parav, I have mixed feelings about such change. It returns EINVAL
if nothing is connected and it is right thing to do. It is hard to call
"valid speed/width" for unconnected port.

I would like to have ibstat and other drivers fixed instead of
converting mlx5 to be wrong.

Proposed change breaks existing scripts.

Thanks

>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> ---
>  drivers/infiniband/hw/mlx5/main.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
> index 260f8be1d0ed..4388618e3434 100644
> --- a/drivers/infiniband/hw/mlx5/main.c
> +++ b/drivers/infiniband/hw/mlx5/main.c
> @@ -246,7 +246,10 @@ static int translate_eth_proto_oper(u32 eth_proto_oper, u8 *active_speed,
>  		*active_speed = IB_SPEED_EDR;
>  		break;
>  	default:
> -		return -EINVAL;
> +		/* Unknown */
> +		*active_width = IB_WIDTH_1X;
> +		*active_speed = IB_SPEED_SDR;
> +		break;
>  	}
>
>  	return 0;
> --
> 2.12.3
>
> --
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