linux-kernel - Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

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Date:   Fri, 18 Nov 2016 12:20:07 +0100
From:   Simon Guinot <simon.guinot@...uanux.org>
To:     "Levy, Amir (Jer)" <amir.jer.levy@...el.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "andreas.noever@...il.com" <andreas.noever@...il.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "mario_limonciello@...l.com" <mario_limonciello@...l.com>,
        thunderbolt-linux <thunderbolt-linux@...el.com>,
        "Westerberg, Mika" <mika.westerberg@...el.com>,
        "Winkler, Tomas" <tomas.winkler@...el.com>,
        "Zhang, Xiong Y" <xiong.y.zhang@...el.com>,
        "Jamet, Michael" <michael.jamet@...el.com>,
        "remi.rerolle@...gate.com" <remi.rerolle@...gate.com>
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM)
 Networking

On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> On Tue, Nov 15 2016, 12:59 PM, Simon Guinot wrote:
> > On Wed, Nov 09, 2016 at 03:42:53PM +0000, Levy, Amir (Jer) wrote:
> > > On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> > > > Hi Amir,
> > > >
> > > > I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a 
> > > > Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
> > > >
> > > > Is the thunderbolt-icm driver supposed to work with this chipset ?
> > > >
> > >
> > > Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
> > > 156d is the bridge -
> > > http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619
> > >
> > > > I have installed both a 4.8.6 Linux kernel (patched with your v9
> > > > series) and the thunderbolt-software-daemon (27 october release) 
> > > > inside a Debian system (Jessie).
> > > >
> > > > If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt 
> > > > 2, device ID 156c), I can see that the thunderbolt-icm driver is 
> > > > loaded and that the thunderbolt-software-daemon is well started. 
> > > > But the Ethernet interface is not created.
> > > >
> > > > I have attached to this email the syslog file. There is the logs 
> > > > from both the kernel and the daemon inside. Note that the daemon 
> > > > logs are everything but clear about what could be the issue. Maybe 
> > > > I missed some kind of configuration ? But I failed to find any 
> > > > valuable information about configuring the driver and/or the 
> > > > daemon in
> > the various documentation files.
> > > >
> > > > Please, can you provide some guidance ? I'd really like to test 
> > > > your patch series.
> > >
> > > First, thank you very much for willing to test it.
> > > Thunderbolt Networking support was added during Falcon Ridge, in the
> > latest FR images.
> > > Do you know which Thunderbolt image version you have on your system?
> > > Currently I submitted only Thunderbolt Networking feature in Linux, 
> > > and we plan to add more features like reading the image version and
> > updating the image.
> > > If you don't know the image version, the only thing I can suggest is 
> > > to load windows, install thunderbolt SW and check in the Thunderbolt
> > application the image version.
> > > To know if image update is needed, you can check - 
> > > https://thunderbolttechnology.net/updates
> > 
> > Hi Amir,
> > 
> > From the Windows Thunderbolt software, I can read 13.00 for the 
> > firmware version. And from https://thunderbolttechnology.net/updates, 
> > I can see that there is no update available for my ASUS motherboard.
> > 
> > Am I good to go ?
> > 
> 
> Thunderbolt Networking is supported on both Thunderbolt(tm) 2 and Thunderbolt(tm) 3 systems.  
> Thunderbolt 2 systems must have updated NVM (version 25 or later) in order for the functionality to work properly.  
> If the system does not have the update, please contact the OEM directly for an updated NVM.  
> For best functionality and support, Intel recommends using Thunderbolt 3 systems for all validation and testing.

Maybe it is worth mentioning in the documentation and/or in the Kconfig
help message that a minimal firmware version is needed for Thunderbolt 2
controllers.

It would have saved some time for me :)

> 
> > BTW, it is quite a shame that the Thunderbolt firmware version can't 
> > be read from Linux.
> > 
> 
> This is WIP, once this patch will be upstream, we will be able to focus more
> on aligning Linux with the Thunderbolt features that we have for windows.

Well, I rather see the firmware identification and update as basic
features on the top of which ones you can build a driver. For example in
this case this would allow the ICM driver and/or the userland daemon to
exit with a useful error message rather than just not working without any
explanation.

Next week I'll try the driver with a Thunderbolt 3 controller.

Thanks for your help!

Simon

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