Re: [PATCH net-next v2] net: bridge: add STP xstats

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From: Vivien Didelot <vivien.didelot@xxxxxxxxx>
Date: Wed, 11 Dec 2019 13:41:33 -0500

> Hi David, Nikolay,
> 
> On Wed, 11 Dec 2019 17:42:33 +0200, Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx> wrote:
>> >>  /* Bridge multicast database attributes
>> >>   * [MDBA_MDB] = {
>> >>   *     [MDBA_MDB_ENTRY] = {
>> >> @@ -261,6 +270,7 @@ enum {
>> >>  	BRIDGE_XSTATS_UNSPEC,
>> >>  	BRIDGE_XSTATS_VLAN,
>> >>  	BRIDGE_XSTATS_MCAST,
>> >> +	BRIDGE_XSTATS_STP,
>> >>  	BRIDGE_XSTATS_PAD,
>> >>  	__BRIDGE_XSTATS_MAX
>> >>  };
>> > 
>> > Shouldn't the new entry be appended to the end - after BRIDGE_XSTATS_PAD
>> > 
>> 
>> Oh yes, good catch. That has to be fixed, too.
>> 
> 
> This I don't get. Why new attributes must come between BRIDGE_XSTATS_PAD
> and __BRIDGE_XSTATS_MAX?

Because, just like any other attribute value, BRIDGE_XSTATS_PAD is an
API and fixed in stone.  You can't add things before it which change
it's value.




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