netdev - Re: [PATCH net-next v2 1/2] bridge: new attribute and flags to represent vlan info lists and ranges

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Message-ID: <54A467EB.5010404@cumulusnetworks.com>
Date:	Wed, 31 Dec 2014 13:17:31 -0800
From:	roopa <roopa@...ulusnetworks.com>
To:	Jeremiah Mahler <jmmahler@...il.com>, netdev@...r.kernel.org,
	shemminger@...tta.com, vyasevic@...hat.com, sfeldma@...il.com,
	wkok@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 1/2] bridge: new attribute and flags to represent
 vlan info lists and ranges

On 12/31/14, 10:48 AM, Jeremiah Mahler wrote:
> Roopa,
>
> On Wed, Dec 31, 2014 at 10:15:53AM -0800, roopa wrote:
>> On 12/31/14, 9:45 AM, Jeremiah Mahler wrote:
>>> Roopa,
>>>
>>> On Wed, Dec 31, 2014 at 08:48:52AM -0800, roopa@...ulusnetworks.com wrote:
>>>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>>
>>>> This patch adds (as suggested by scott feldman),
>>>>          - new netlink attribute IFLA_BRIDGE_VLAN_INFO_LIST to represent
>>>>            vlan list
>>>>          - And bridge_vlan_info flags BRIDGE_VLAN_INFO_RANGE_START and
>>>>            BRIDGE_VLAN_INFO_RANGE_END to indicate start and end of vlan range
>>>>
>>>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>> ---
>>>>   include/uapi/linux/if_bridge.h |    4 ++++
>>>>   net/bridge/br_netlink.c        |    1 +
>>>>   2 files changed, 5 insertions(+)
>>>>
>>>> diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
>>>> index b03ee8f..fa468aa 100644
>>>> --- a/include/uapi/linux/if_bridge.h
>>>> +++ b/include/uapi/linux/if_bridge.h
>>>> @@ -112,12 +112,14 @@ struct __fdb_entry {
>>>>    *     [IFLA_BRIDGE_FLAGS]
>>>>    *     [IFLA_BRIDGE_MODE]
>>>>    *     [IFLA_BRIDGE_VLAN_INFO]
>>>> + *     [IFLA_BRIDGE_VLAN_INFO_LIST]
>>>>    * }
>>>>    */
>>>>   enum {
>>>>   	IFLA_BRIDGE_FLAGS,
>>>>   	IFLA_BRIDGE_MODE,
>>>>   	IFLA_BRIDGE_VLAN_INFO,
>>>> +	IFLA_BRIDGE_VLAN_INFO_LIST,
>>>>   	__IFLA_BRIDGE_MAX,
>>>>   };
>>>>   #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
>>>> @@ -125,6 +127,8 @@ enum {
>>>>   #define BRIDGE_VLAN_INFO_MASTER	(1<<0)	/* Operate on Bridge device as well */
>>>>   #define BRIDGE_VLAN_INFO_PVID	(1<<1)	/* VLAN is PVID, ingress untagged */
>>>>   #define BRIDGE_VLAN_INFO_UNTAGGED	(1<<2)	/* VLAN egresses untagged */
>>>> +#define BRIDGE_VLAN_INFO_RANGE_START	(1<<3) /* VLAN is start of vlan range */
>>>> +#define BRIDGE_VLAN_INFO_RANGE_END	(1<<4) /* VLAN is end of vlan range */
>>> You add these here but you don't use them until the next patch.
>>> If they were wrong a bisect would point to the next patch.
>>>
>>> I would add them in the next patch where you start to use them.
>> I thought it was ok to declare it first and use them in the next patch. Only
>> the other way around would be bad.
>>   I have submitted in a similar way before. If needed i will resubmit.
>>
>>
> Hmm.  I cannot see how the other way would be bad but maybe I am missing
> something.
sorry, i did not mean what you were saying would be bad. I was just 
trying to say that, use first and declare later would be bad (ie if my 
patches 1 and 2 were swapped). Otherwise i don't see a problem.

I know that you are saying i should combine the patches 1 and 2 into a 
single patch. That is not a problem. If i need to respin again due to 
other reasons i will consider merging them as well if that is a concern.

thanks.

>   Hopefully someone else has some insight.
>
>>
>>>>   struct bridge_vlan_info {
>>>>   	__u16 flags;
>>>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>>>> index 9f5eb55..492ef6a 100644
>>>> --- a/net/bridge/br_netlink.c
>>>> +++ b/net/bridge/br_netlink.c
>>>> @@ -223,6 +223,7 @@ static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
>>>>   	[IFLA_BRIDGE_MODE]	= { .type = NLA_U16 },
>>>>   	[IFLA_BRIDGE_VLAN_INFO]	= { .type = NLA_BINARY,
>>>>   				    .len = sizeof(struct bridge_vlan_info), },
>>>> +	[IFLA_BRIDGE_VLAN_INFO_LIST] = { .type = NLA_NESTED, },
>>>>   };
>>>>   static int br_afspec(struct net_bridge *br,
>>>> -- 
>>>> 1.7.10.4
>>>>
>>>> --
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