netdev - Re: [PATCH net-next 01/10] net: bridge: add document for IFLA

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Date: Sun, 19 Nov 2023 18:46:25 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Ido Schimmel <idosch@...sch.org>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Roopa Prabhu <roopa@...dia.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Florian Westphal <fw@...len.de>, Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jiri Pirko <jiri@...nulli.us>, Marc Muehlfeld <mmuehlfe@...hat.com>
Subject: Re: [PATCH net-next 01/10] net: bridge: add document for IFLA_BR enum

On Fri, Nov 17, 2023 at 05:31:36PM +0800, Hangbin Liu wrote:
> + * @IFLA_BR_MAX_AGE
> + *   The hello packet timeout, is the time until another bridge in the

No comma between subject and predicate.

> + *   spanning tree is assumed to be dead, after reception of its last hello
> + *   message. Only relevant if STP is enabled.
> + *
> + *   The valid values are between (6 * USER_HZ) and (40 * USER_HZ).
> + *   The default value is (20 * USER_HZ).
> + *
> + * @IFLA_BR_GROUP_FWD_MASK
> + *   The group forward mask. This is the bitmask that is applied to
> + *   decide whether to forward incoming frames destined to link-local
> + *   addresses. The addresses of the form is 01:80:C2:00:00:0X, which
> + *   means the bridge does not forward any link-local frames coming on
> + *   this port).
> + *
> + *   The default value is 0.

I'm confused by this description, I believe some of the wording is
misplaced. Maybe:

   The group forwarding mask. This is the bitmask that is applied to
   decide whether to forward incoming frames destined to link-local
   addresses (of the form 01:80:C2:00:00:0X).

   The default value is 0, which means the bridge does not forward any
   link-local frames coming on this port.

> + * @IFLA_BR_VLAN_DEFAULT_PVID
> + *   The default PVID (native/untagged VLAN ID) for this bridge.

I don't think that "native VLAN" is a good description of this.
The native VLAN should be the only egress-untagged VLAN of a port.

I would say "VLAN ID applied to untagged and priority-tagged incoming
packets".

> + *
> + *   The default value is 1.

I would also mention that the special value of 0 makes all ports of
this bridge not have a PVID by default, which means that they will
not accept VLAN-untagged traffic.