netdev - Re: [PATCH v2 0/9] thunderbolt: Add support for USB4

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Date:   Wed, 18 Dec 2019 17:30:02 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Rajmohan Mani <rajmohan.mani@...el.com>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        Lukas Wunner <lukas@...ner.de>,
        Alan Stern <stern@...land.harvard.edu>,
        Mario.Limonciello@...l.com,
        Anthony Wong <anthony.wong@...onical.com>,
        Oliver Neukum <oneukum@...e.com>,
        Christian Kellner <ckellner@...hat.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/9] thunderbolt: Add support for USB4

On Wed, Dec 18, 2019 at 03:43:16PM +0100, Greg Kroah-Hartman wrote:
> On Tue, Dec 17, 2019 at 03:33:36PM +0300, Mika Westerberg wrote:
> > Hi all,
> > 
> > USB4 is the public specification of Thunderbolt 3 protocol and can be
> > downloaded here:
> > 
> >   https://www.usb.org/sites/default/files/USB4%20Specification_1.zip
> > 
> > USB4 is about tunneling different protocols over a single cable (in the
> > same way as Thunderbolt). The current USB4 spec supports PCIe, Display Port
> > and USB 3.x, and also software based protocols such as networking between
> > domains (hosts).
> > 
> > So far PCs have been using firmware based Connection Manager (FW CM, ICM)
> > and Apple systems have been using software based one (SW CM, ECM). A
> > Connection Manager is the entity that handles creation of different tunnel
> > types through the USB4 (and Thunderbolt) fabric. With USB4 the plan is to
> > have software based Connection Manager everywhere but some early systems
> > will come with firmware based connection manager.
> > 
> > Current Linux Thunderbolt driver supports both "modes" and can detect which
> > one to use dynamically.
> > 
> > This series extends the Linux Thunderbolt driver to support USB4 compliant
> > hosts and devices (this applies to both firmware and software based
> > connection managers). USB4 Features enabled by this series include:
> > 
> >   - PCIe tunneling
> >   - Display Port tunneling
> >   - USB 3.x tunneling
> >   - P2P networking (implemented in drivers/net/thunderbolt.c)
> >   - Host and device NVM firmware upgrade
> > 
> > Power management support is still work in progress. It will be submitted
> > later on once properly tested.
> > 
> > The previous versions of the series can be seen here:
> > 
> >   v1: https://lore.kernel.org/linux-usb/20191023112154.64235-1-mika.westerberg@linux.intel.com/
> >   RFC: https://lore.kernel.org/lkml/20191001113830.13028-1-mika.westerberg@linux.intel.com/
> > 
> > Changes from v1:
> > 
> >   * Rebased on top of v5.5-rc2.
> >   * Add a new patch to populate PG field in hotplug ack packet.
> >   * Rename the networking driver Kconfig symbol to CONFIG_USB4_NET to
> >     follow the driver itself (CONFIG_USB4).
> 
> At a quick glance, this looks nice and sane, good job.  I've taken all
> of these into my tree, let's see if 0-day has any problems with it :)

Thanks :)