netdev - Re: [patch net-next 07/13] dsa: implement ndo_swdev_get

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Message-ID: <20140904124701.GH1867@nanopsycho.lan>
Date:	Thu, 4 Sep 2014 14:47:01 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, tgraf@...g.ch, dborkman@...hat.com,
	ogerlitz@...lanox.com, jesse@...ira.com, pshelar@...ira.com,
	azhou@...ira.com, ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
	roopa@...ulusnetworks.com, linville@...driver.com,
	dev@...nvswitch.org, jasowang@...hat.com, ebiederm@...ssion.com,
	nicolas.dichtel@...nd.com, ryazanov.s.a@...il.com,
	buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org,
	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
	ronye@...lanox.com
Subject: Re: [patch net-next 07/13] dsa: implement ndo_swdev_get_id

Thu, Sep 04, 2014 at 01:20:58AM CEST, f.fainelli@...il.com wrote:
>On 09/03/2014 02:24 AM, Jiri Pirko wrote:
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  include/linux/netdevice.h |  3 ++-
>>  include/net/dsa.h         |  1 +
>>  net/dsa/Kconfig           |  2 +-
>>  net/dsa/dsa.c             |  3 +++
>>  net/dsa/slave.c           | 10 ++++++++++
>>  5 files changed, 17 insertions(+), 2 deletions(-)
>> 
>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>> index 6a009d1..7ee070f 100644
>> --- a/include/linux/netdevice.h
>> +++ b/include/linux/netdevice.h
>> @@ -41,7 +41,6 @@
>>  
>>  #include <linux/ethtool.h>
>>  #include <net/net_namespace.h>
>> -#include <net/dsa.h>
>>  #ifdef CONFIG_DCB
>>  #include <net/dcbnl.h>
>>  #endif
>> @@ -1259,6 +1258,8 @@ enum netdev_priv_flags {
>>  #define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
>>  #define IFF_MACVLAN			IFF_MACVLAN
>>  
>> +#include <net/dsa.h>
>> +
>>  /**
>>   *	struct net_device - The DEVICE structure.
>>   *		Actually, this whole structure is a big mistake.  It mixes I/O
>> diff --git a/include/net/dsa.h b/include/net/dsa.h
>> index 9771292..d60cd42 100644
>> --- a/include/net/dsa.h
>> +++ b/include/net/dsa.h
>> @@ -140,6 +140,7 @@ struct dsa_switch {
>>  	u32			phys_mii_mask;
>>  	struct mii_bus		*slave_mii_bus;
>>  	struct net_device	*ports[DSA_MAX_PORTS];
>> +	struct netdev_phys_item_id psid;
>>  };
>>  
>>  static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
>> diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
>> index a585fd6..4e144a2 100644
>> --- a/net/dsa/Kconfig
>> +++ b/net/dsa/Kconfig
>> @@ -1,6 +1,6 @@
>>  config HAVE_NET_DSA
>>  	def_bool y
>> -	depends on NETDEVICES && !S390
>> +	depends on NETDEVICES && NET_SWITCHDEV && !S390
>
>It does not look like this is necessary, we are only using definitions
>from net/dsa.h and include/linux/netdevice.h, and if it was, a 'select'
>would be more appropriate here I think.
>
>TBH, I think we should rather drop this patch for now, I do not see any
>benefit in providing a random id over no-id at all.

Well, the benefit is that you are still able to see which ports belong
to the same switch.

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