From: Andrew Lunn <andrew@lunn•ch>
To: Florian Fainelli <f.fainelli@gmail•com>
Cc: narmstrong@baylibre•com, vivien.didelot@savoirfairelinux•com,
netdev <netdev@vger•kernel.org>
Subject: Re: [PATCH RFC 00/28] DSA: Restructure probing
Date: Wed, 23 Dec 2015 23:33:03 +0100 [thread overview]
Message-ID: <20151223223303.GD25485@lunn.ch> (raw)
In-Reply-To: <567B07CB.5080308@gmail.com>
On Wed, Dec 23, 2015 at 12:44:59PM -0800, Florian Fainelli wrote:
> Hi Andrew,
>
> Le 23/12/2015 04:56, Andrew Lunn a écrit :
> > As noted in Documentation/networking/dsa/dsa.txt, the current DSA
> > architecture has a few architecture problems:
> >
> > DSA is implemented as a DSA platform device driver which is convenient because
> > it will register the entire DSA switch tree attached to a master network device
> > in one-shot, facilitating the device creation and simplifying the device driver
> > model a bit, this comes however with a number of limitations:
> >
> > - building DSA and its switch drivers as modules is currently not working
> > - the device driver parenting does not necessarily reflect the original
> > bus/device the switch can be created from
> > - supporting non-MDIO and non-MMIO (platform) switches is not possible
> >
> > This RFC patchset attempts to address this. It allows the switch
> > device to be true Linux devices, and use of the device component
> > framework to bind the switch devices to the DSA framework, similar to
> > the way GPU engines are bound to the master GPU driver. The drivers
> > are now modules, which can be loaded and unloaded. Reloading however
> > currently causes an Opps, hence RFC.
> >
> > The code remains backwards compatible with the old binding, and adds a
> > new property to facilitate the component framework. Switch drivers get
> > there own binding, allowing them to be probed independent of DSA.
Hi Florian
> Well, sort of, and that is the part that gives me mixed feelings right
> now. Your conversion of the bcm_sf2 driver, although it looks good and
> gets us where we should go, still poses a major problem for my platforms
> where a wrong DTB is frozen (at least for some time).
I hope i've not broken backwards compatibility, so your old DT blobs
should still work. If they don't work, we should debug why.
> I still think that using a 'dsa' platform device and having to bind
> other drivers to it is just an artifact and relic from the original
> design that we do not necessarily need anymore but with the components
> framework, it seems to get us in a better shape.
I don't really see how we can do without a dsa platform driver. We
need something that brings together all the switches in a cluster. We
need somewhere which holds the information about how these switches
are connected together and connected to the host.
Andrew
next prev parent reply other threads:[~2015-12-23 22:33 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-23 12:56 [PATCH RFC 00/28] DSA: Restructure probing Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 01/28] component: remove old add_components method Andrew Lunn
2015-12-23 13:21 ` Russell King - ARM Linux
2015-12-23 15:57 ` Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 02/28] ARM: VF610: Add Zodiac Inflight Innovations development boards Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 03/28] net: dsa: Move platform data allocation for OF Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 04/28] dsa: Rename mv88e6123_61_65 to mv88e6123 to be consistent Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 05/28] net: dsa: Pass the dsa device to the switch drivers Andrew Lunn
2015-12-23 20:36 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 06/28] net: dsa: Have the switch driver allocate there own private memory Andrew Lunn
2015-12-23 20:39 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 07/28] net: dsa: Remove allocation of driver " Andrew Lunn
2015-12-23 20:39 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 08/28] net: dsa: Keep the mii bus and address in the private structure Andrew Lunn
2015-12-23 20:40 ` Florian Fainelli
2016-01-21 20:41 ` Vivien Didelot
2016-01-21 20:50 ` Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 09/28] net: dsa: Add basic support for component master support Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 10/28] net: dsa: Keep a reference to the switch device for component matching Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 11/28] net: dsa: Add slave component matches based on a phandle to the slave Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 12/28] net: dsa: Make dsa,mii-bus optional Andrew Lunn
2015-12-23 20:42 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 13/28] net: dsa: Add register/unregister functions for switch drivers Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 14/28] net: dsa: Rename DSA probe function Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 15/28] of_mdio: Add "mii-bus" and address property parser Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 16/28] dsa: mv88e6xxx: Use bus in mv88e6xxx_lookup_name() Andrew Lunn
2016-01-21 20:54 ` Vivien Didelot
2015-12-23 12:56 ` [PATCH RFC 17/28] dsa: mv88e6xxx: Add shared code for binding/unbinding a switch driver Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 18/28] dsa: Add platform device support to Marvell switches Andrew Lunn
2016-01-21 21:05 ` Vivien Didelot
2015-12-23 12:56 ` [PATCH RFC 19/28] net: dsa: bcm_sf2: make it a real platform driver Andrew Lunn
2015-12-23 20:32 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 20/28] vf610: Zii: Convert rev b to switches as individual devices Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 21/28] net: dsa: Add some debug prints for error cases Andrew Lunn
2015-12-23 20:42 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 22/28] net: dsa: Setup the switches after all have been probed Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 23/28] net: dsa: Only setup platform switches, not device switches Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 24/28] net: dsa: If a switch fails to probe, defer probing Andrew Lunn
2015-12-23 20:46 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 25/28] Documentation: DSA: Describe how probe of DSA and switches work Andrew Lunn
2015-12-23 20:48 ` Florian Fainelli
2015-12-23 22:53 ` Andrew Lunn
2015-12-25 1:29 ` Florian Fainelli
2015-12-25 10:00 ` Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 26/28] dsa: Convert mv88e6xxx into a library allowing driver modules Andrew Lunn
2015-12-25 21:47 ` Florian Fainelli
2016-01-21 21:29 ` Vivien Didelot
2016-01-21 21:54 ` Andrew Lunn
2015-12-23 12:56 ` [PATCH RFC 27/28] dsa: slave: Don't reference NULL pointer during phy_disconnect Andrew Lunn
2015-12-23 20:45 ` Florian Fainelli
2015-12-23 12:56 ` [PATCH RFC 28/28] dsa: Destroy fixed link phys after the phy has been disconnected Andrew Lunn
2015-12-23 20:45 ` Florian Fainelli
2015-12-23 20:44 ` [PATCH RFC 00/28] DSA: Restructure probing Florian Fainelli
2015-12-23 22:33 ` Andrew Lunn [this message]
2015-12-23 23:13 ` Florian Fainelli
2015-12-24 12:58 ` Andrew Lunn
2015-12-25 1:47 ` Florian Fainelli
2015-12-25 11:31 ` Andrew Lunn
2015-12-25 22:00 ` Florian Fainelli
2015-12-25 23:41 ` Andrew Lunn
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