netdev - Re: [PATCH net-next v3 10/12] net: dsa: support switchdev ageing time attr

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Message-ID: <20160719142009.GA31103@lunn.ch>
Date:	Tue, 19 Jul 2016 16:20:09 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 10/12] net: dsa: support switchdev ageing
 time attr

On Mon, Jul 18, 2016 at 09:26:00PM -0700, Florian Fainelli wrote:
> Le 18/07/2016 à 20:24, Andrew Lunn a écrit :
> > On Mon, Jul 18, 2016 at 08:45:38PM -0400, Vivien Didelot wrote:
> >> Add a new function for DSA drivers to handle the switchdev
> >> SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME attribute.
> >>
> >> The ageing time is passed as milliseconds.
> >>
> >> Also because we can have multiple logical bridges on top of a physical
> >> switch and ageing time are switch-wide, call the driver function with
> >> the fastest ageing time in use on the chip instead of the requested one.
> >>
> >> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> >> ---
> >>  include/net/dsa.h |  2 ++
> >>  net/dsa/slave.c   | 41 +++++++++++++++++++++++++++++++++++++++++
> > 
> 
> Hi Andrew,
> 
> > Hi Florian
> > 
> > It looks like the SF2 can do fast ageing per port. What i don't see if
> > what configuration options you have. Can you get the fast and the
> > normal age time per port? Or is it global?
> 
> The normal ageing is global and the value needs to be programmed in
> seconds, can can range from 10 to 1,048,575 (encoded on 20 bits). The
> fast-ageing can actually be per-port, per-VLAN id, for just dynamic or
> static entries etc. and is just a poor name for a flush based on any of
> these criteria.

Hi Florian

So fast ageing does not have a timer value associated to it? It is
just a flush?

If so, the code Vivien is proposing in DSA slave is O.K. If however
there was a per port timer, Vivien's code is too high in the stack,
blocking SF2 from being able to use per-port timers. That is what i'm
trying to get at.

	 Andrew