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

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Date:   Wed, 11 Dec 2019 16:47:54 -0500
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     nikolay@...ulusnetworks.com, dsahern@...il.com,
        roopa@...ulusnetworks.com, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org, stephen@...workplumber.org
Subject: Re: [PATCH net-next v2] net: bridge: add STP xstats

Hi David,

On Wed, 11 Dec 2019 12:01:20 -0800 (PST), David Miller <davem@...emloft.net> 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.

I thought the whole point of using enums was to avoid caring about fixed
numeric values, but well. To be more precise, what I don't get is that when
I move the BRIDGE_XSTATS_STP definition *after* BRIDGE_XSTATS_PAD, the STP
xstats don't show up anymore in iproute2.


Thanks,

	Vivien