netdev - Re: [PATCH net-next v9 2/4] net: Introduce generic failover module

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Message-ID: <77b1e77a-a7d7-3c78-1c63-0f2982a9d681@intel.com>
Date:   Wed, 2 May 2018 14:36:41 -0700
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, stephen@...workplumber.org,
        davem@...emloft.net, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, jesse.brandeburg@...el.com,
        alexander.h.duyck@...el.com, kubakici@...pl, jasowang@...hat.com,
        loseweigh@...il.com, aaron.f.brown@...el.com
Subject: Re: [PATCH net-next v9 2/4] net: Introduce generic failover module

On 5/2/2018 1:30 PM, Michael S. Tsirkin wrote:
> On Wed, May 02, 2018 at 10:51:12AM -0700, Samudrala, Sridhar wrote:
>>
>> On 5/2/2018 9:15 AM, Jiri Pirko wrote:
>>> Sat, Apr 28, 2018 at 11:06:01AM CEST, jiri@...nulli.us wrote:
>>>> Fri, Apr 27, 2018 at 07:06:58PM CEST, sridhar.samudrala@...el.com wrote:
>>> [...]
>>>
>>>
>>>>> +
>>>>> +	err = netdev_rx_handler_register(slave_dev, net_failover_handle_frame,
>>>>> +					 failover_dev);
>>>>> +	if (err) {
>>>>> +		netdev_err(slave_dev, "can not register failover rx handler (err = %d)\n",
>>>>> +			   err);
>>>>> +		goto err_handler_register;
>>>>> +	}
>>>>> +
>>>>> +	err = netdev_upper_dev_link(slave_dev, failover_dev, NULL);
>>>> Please use netdev_master_upper_dev_link().
>>> Don't forget to fillup struct netdev_lag_upper_info - NETDEV_LAG_TX_TYPE_ACTIVEBACKUP
>>>
>>>
>>> Also, please call netdev_lower_state_changed() when the active slave
>>> device changes from primary->backup of backup->primary and whenever link
>>> state of a slave changes
>>>
>> Sure. will look into it.  Do you think this will help with the issue
>> you saw with having to change mac on standy twice to get the init scripts
>> working? We are now going to block changing the mac on both standby and
>> failover.
>>
>> Also, i was wondering if we should set dev->flags to IFF_MASTER on failover
>> and IFF_SLAVE on primary and standby.
> We do need a way to find things out, that's for sure.
> How does userspace know it's a failover
> config and find the failover device right now?

# ethtool -i ens12|grep driver
driver: failover

# ethtool -i ens12n_sby|grep driver
driver: virtio_net