netdev - Re: [patch net-next 24/26] mlxsw: spectrum: Implement LAG port join/leave

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Date:	Wed, 2 Dec 2015 15:10:22 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
	eladr@...lanox.com, yotamg@...lanox.com, ogerlitz@...lanox.com
Subject: Re: [patch net-next 24/26] mlxsw: spectrum: Implement LAG port
 join/leave

Wed, Dec 02, 2015 at 03:01:32PM CET, gospo@...ulusnetworks.com wrote:
>On Tue, Dec 01, 2015 at 02:49:02PM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> Implement basic procedures for joining/leaving port to/from LAG. That
>> includes HW setup of collector, core LAG mapping setup.
>> 
>[...]
>> @@ -1937,6 +2153,18 @@ static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
>>  				mlxsw_sp_port->bridged = 0;
>>  				mlxsw_sp_master_bridge_dec(mlxsw_sp, upper_dev);
>>  			}
>> +		} else if (netif_is_lag_master(upper_dev)) {
>> +			if (info->linking) {
>> +				err = mlxsw_sp_port_lag_join(mlxsw_sp_port,
>> +							     upper_dev);
>> +				if (err)
>> +					netdev_err(dev, "Failed to join link aggregation\n");
>> +			} else {
>> +				err = mlxsw_sp_port_lag_leave(mlxsw_sp_port,
>> +							      upper_dev);
>> +				if (err)
>> +					netdev_err(dev, "Failed to leave link aggregation\n");
>> +			}
>>  		}
>>  		break;
>>  	}
>
>If I'm reading this correctly, moving an offloaded port into a bond/team
>or changing configuration options isn't synchronous.  It seems like the
>lack of immediate feedback to the caller is not desired.

This is actually something we have prepared and wanted to push as a
follow-up. To allow driver to return NOTIBY_BAD here and let changeupper
to fail back to bond/team code.
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