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

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Date: Tue, 21 Nov 2023 11:06:03 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Vladimir Oltean <olteanv@...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 Sun, Nov 19, 2023 at 06:46:25PM +0200, Vladimir Oltean wrote:
> 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.

Thanks for the comments. I will update it in next version.

Hangbin