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:	Tue, 28 Apr 2015 08:49:13 -0700
From:	Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.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 10:51 PM, Scott Feldman <sfeldma@...il.com> wrote:
> 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.

I wanted to check with you first on the rocker handling; that is the main
reason for posting this an RFC (thanks for the review).

I used rocker_port_set_enable/PORT_PHYS_ENABLE for setting the phy state
because I assumed that in the case of an offloaded switch driver it would be
the equivalent of doing "sdk port N en=1|0". Is that not the case? If not,
could you please point me in the right direction?
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