netdev - Re: [RFC PATCH net-next v3 3/4] rocker: Handle IFF_PROTODOWN by doing a PHYS-DOWN on the switch port.

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Date:	Mon, 27 Apr 2015 22:51:06 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	anuradhak@...ulusnetworks.com
Cc:	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Wilson Kok <wkok@...ulusnetworks.com>
Subject: Re: [RFC PATCH net-next v3 3/4] rocker: Handle IFF_PROTODOWN by doing
 a PHYS-DOWN on the switch port.

On Mon, Apr 27, 2015 at 10:38 AM,  <anuradhak@...ulusnetworks.com> wrote:
> From: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
>
> IFF_PROTODOWN can be set by user space applications like MLAG on detecting
> errors on a switch port. This patch provides sample switch driver changes
> for handling IFF_PROTODOWN. Rocker PHYS disables the port in response to
> protodown.
>
> Note: I understand Scott has some rocker changes on hold. I will re-spin
> this patch once his changes are in.
>
> Signed-off-by: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
> Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> Signed-off-by: Wilson Kok <wkok@...ulusnetworks.com>
> ---
>  drivers/net/ethernet/rocker/rocker.c |   16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
> index a87b177..e3084e3 100644
> --- a/drivers/net/ethernet/rocker/rocker.c
> +++ b/drivers/net/ethernet/rocker/rocker.c
> @@ -3838,7 +3838,8 @@ static int rocker_port_open(struct net_device *dev)
>
>         napi_enable(&rocker_port->napi_tx);
>         napi_enable(&rocker_port->napi_rx);
> -       rocker_port_set_enable(rocker_port, true);
> +       if (!(dev->flags & IFF_PROTO_DOWN))
> +               rocker_port_set_enable(rocker_port, true);
>         netif_start_queue(dev);
>         return 0;
>
> @@ -4238,6 +4239,18 @@ static int rocker_port_swdev_port_stp_update(struct net_device *dev, u8 state)
>         return rocker_port_stp_update(rocker_port, state);
>  }
>
> +static int rocker_port_swdev_port_phy_state_set(struct net_device *dev,
> +                                               bool enable)
> +{
> +       struct rocker_port *rocker_port = netdev_priv(dev);
> +
> +       if (enable && (dev->flags & IFF_UP) && !(dev->flags & IFF_PROTO_DOWN))
> +               rocker_port_set_enable(rocker_port, true);
> +       else
> +               rocker_port_set_enable(rocker_port, false);

This isn't working like your expecting.  PHY link is still up on the
rocker port, so the other end of the wire still sees link UP even when
IFF_PROTO_DOWN is set locally.
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