netdev - Re: [patch net-next 2/2] openvswitch: introduce rtnl ops stub

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Date:	Wed, 25 Jun 2014 18:35:09 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, pshelar@...ira.com,
	cwang@...pensource.com, nicolas.dichtel@...nd.com,
	david@...son.dropbear.id.au, sfeldma@...ulusnetworks.com,
	sucheta.chakraborty@...gic.com, stephen@...workplumber.org
Subject: Re: [patch net-next 2/2] openvswitch: introduce rtnl ops stub

Wed, Jun 25, 2014 at 06:02:42PM CEST, ebiederm@...ssion.com wrote:
>Jiri Pirko <jiri@...nulli.us> writes:
>
>> This stub now allows userspace to see IFLA_INFO_KIND for ovs master and
>> IFLA_INFO_SLAVE_KIND for slave.
>
>I am puzzled why you don't implement full rtnl_link_operations support.

openvswitch does not need that at the moment (most probably it never
will). Creation and deletion is handled over separate genl channel.

>
>If all you want is to report which kind of driver you have I suspect
>implementing ethtool_ops.get_drvinfo is a much better fit.

That is maybe partly true but that would not be consistent with bond, team,
bridge masters and slaves which benefit ops->kind to expose the type
into userspace.

>
>Eric
>
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  net/openvswitch/datapath.c           |  9 ++++++++-
>>  net/openvswitch/vport-internal_dev.c | 16 ++++++++++++++++
>>  net/openvswitch/vport-internal_dev.h |  2 ++
>>  3 files changed, 26 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
>> index 0d407bc..fe95b6c 100644
>> --- a/net/openvswitch/datapath.c
>> +++ b/net/openvswitch/datapath.c
>> @@ -2054,10 +2054,14 @@ static int __init dp_init(void)
>>  
>>  	pr_info("Open vSwitch switching datapath\n");
>>  
>> -	err = ovs_flow_init();
>> +	err = ovs_internal_dev_rtnl_link_register();
>>  	if (err)
>>  		goto error;
>>  
>> +	err = ovs_flow_init();
>> +	if (err)
>> +		goto error_unreg_rtnl_link;
>> +
>>  	err = ovs_vport_init();
>>  	if (err)
>>  		goto error_flow_exit;
>> @@ -2084,6 +2088,8 @@ error_vport_exit:
>>  	ovs_vport_exit();
>>  error_flow_exit:
>>  	ovs_flow_exit();
>> +error_unreg_rtnl_link:
>> +	ovs_internal_dev_rtnl_link_unregister();
>>  error:
>>  	return err;
>>  }
>> @@ -2096,6 +2102,7 @@ static void dp_cleanup(void)
>>  	rcu_barrier();
>>  	ovs_vport_exit();
>>  	ovs_flow_exit();
>> +	ovs_internal_dev_rtnl_link_unregister();
>>  }
>>  
>>  module_init(dp_init);
>> diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c
>> index 789af92..295471a 100644
>> --- a/net/openvswitch/vport-internal_dev.c
>> +++ b/net/openvswitch/vport-internal_dev.c
>> @@ -26,6 +26,7 @@
>>  
>>  #include <net/dst.h>
>>  #include <net/xfrm.h>
>> +#include <net/rtnetlink.h>
>>  
>>  #include "datapath.h"
>>  #include "vport-internal_dev.h"
>> @@ -121,6 +122,10 @@ static const struct net_device_ops internal_dev_netdev_ops = {
>>  	.ndo_get_stats64 = internal_dev_get_stats,
>>  };
>>  
>> +static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
>> +	.kind = "openvswitch",
>> +};
>> +
>>  static void do_setup(struct net_device *netdev)
>>  {
>>  	ether_setup(netdev);
>> @@ -131,6 +136,7 @@ static void do_setup(struct net_device *netdev)
>>  	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
>>  	netdev->destructor = internal_dev_destructor;
>>  	netdev->ethtool_ops = &internal_dev_ethtool_ops;
>> +	netdev->rtnl_link_ops = &internal_dev_link_ops;
>>  	netdev->tx_queue_len = 0;
>>  
>>  	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
>> @@ -248,3 +254,13 @@ struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
>>  
>>  	return internal_dev_priv(netdev)->vport;
>>  }
>> +
>> +int ovs_internal_dev_rtnl_link_register(void)
>> +{
>> +	return rtnl_link_register(&internal_dev_link_ops);
>> +}
>> +
>> +void ovs_internal_dev_rtnl_link_unregister(void)
>> +{
>> +	rtnl_link_unregister(&internal_dev_link_ops);
>> +}
>> diff --git a/net/openvswitch/vport-internal_dev.h b/net/openvswitch/vport-internal_dev.h
>> index 9a7d30e..1b179a1 100644
>> --- a/net/openvswitch/vport-internal_dev.h
>> +++ b/net/openvswitch/vport-internal_dev.h
>> @@ -24,5 +24,7 @@
>>  
>>  int ovs_is_internal_dev(const struct net_device *);
>>  struct vport *ovs_internal_dev_get_vport(struct net_device *);
>> +int ovs_internal_dev_rtnl_link_register(void);
>> +void ovs_internal_dev_rtnl_link_unregister(void);
>>  
>>  #endif /* vport-internal_dev.h */
--
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