Re: [PATCH v7 0/3] usb: gadget: 9pfs transport

[Michael Grzeschik <mgr@pengutronix.de>]

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Ignore this series. There is no difference to v6 here. I will send
v8 in a sec.

On Mon, Jul 22, 2024 at 12:08:16AM +0200, Michael Grzeschik wrote:
>This series is adding support to mount usb hostside exported 9pfs
>filesystems via the usb gadget interface. It also includes a simple tool
>(p9_fwd.py) to translate an tcp 9pfs transport and reuse it via the usb
>interface.
>
>    +--------------------------+    |    +--------------------------+
>    |  9PFS mounting client    |    |    |  9PFS exporting server   |
> SW |                          |    |    |                          |
>    |   (this:trans_usbg)      |    |    |(e.g. diod or nfs-ganesha)|
>    +-------------^------------+    |    +-------------^------------+
>                  |                 |                  |
>                  |                 |           +------v------+
>                  |                 |           |  p9_fwd.py  |
>                  |                 |           +------^------+
>                  |                 |                  |
>------------------|------------------------------------|-------------
>                  |                 |                  |
>    +-------------v------------+    |    +-------------v------------+
>    |                          |    |    |                          |
> HW |   USB Device Controller  <--------->   USB Host Controller    |
>    |                          |    |    |                          |
>    +--------------------------+    |    +--------------------------+
>
>The USB host exports a filesystem, while the gadget on the USB device
>side makes it mountable.
>
>Diod (9pfs server) and the forwarder are on the development host, where
>the root filesystem is actually stored. The gadget is initialized during
>boot (or later) on the embedded board. Then the forwarder will find it
>on the USB bus and start forwarding requests.
>
>In this case the 9p requests come from the device and are handled by the
>host. The reason is that USB device ports are normally not available on
>PCs, so a connection in the other direction would not work.
>
>One use-case is to use it as an alternative to NFS root booting during
>the development of embedded Linux devices.
>
>Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
>---
>Changes in v7:
>- added back the req_lock spinlock
>- Link to v6: https://lore.kernel.org/r/20240116-ml-topic-u9p-v6-0-695977d76dff@pengutronix.de
>
>Changes in v6:
>- fixed the python script not to have path set by default
>- improved the lock init
>- fixed usb9pfs status change to connected
>- Link to v5: https://lore.kernel.org/r/20240116-ml-topic-u9p-v5-0-5ed0abd53ef5@pengutronix.de
>
>Changes in v5:
>- fixed lockup in mount -> remount -> monut scenario
>- improved p9_fwd transport script with more options
>- Link to v4: https://lore.kernel.org/r/20240116-ml-topic-u9p-v4-0-722ed28b0ade@pengutronix.de
>
>Changes in v4:
>- reworked the naming scheme to be set by the configfs instance
>- added conn_cancel function to properly stop the transfers
>- ensured that umount -f will work even when the host side has crahed
>- added all the review feedback from Andrzej Pietrasiewicz
>- Link to v3: https://lore.kernel.org/r/20240116-ml-topic-u9p-v3-0-c62a36eccda1@pengutronix.de
>
>Changes in v3:
>- dropped patch "usb: gadget: legacy: add 9pfs multi gadget" as discussed with gregkh
>- Link to v2: https://lore.kernel.org/r/20240116-ml-topic-u9p-v2-0-b46cbf592962@pengutronix.de
>
>Changes in v2:
>- improved the commit messages
>- introduced an patch to move the header u_f.h to include/linux/usb to compile usb gadget functions treewide
>- moved usbg gadget function to net/9p/
>- adderessed several comments in function driver, like the cleanup path and kbuild errors
>- improved the documentation in Documentation/filesystems/9p.rst
>- Link to v1: https://lore.kernel.org/r/20240116-ml-topic-u9p-v1-0-ad8c306f9a4e@pengutronix.de
>
>---
>Michael Grzeschik (3):
>      usb: gadget: function: move u_f.h to include/linux/usb/func_utils.h
>      net/9p/usbg: Add new usb gadget function transport
>      tools: usb: p9_fwd: add usb gadget packet forwarder script
>
> Documentation/filesystems/9p.rst                   |  58 +-
> drivers/usb/gadget/configfs.c                      |   2 +-
> drivers/usb/gadget/function/f_fs.c                 |   2 +-
> drivers/usb/gadget/function/f_hid.c                |   2 +-
> drivers/usb/gadget/function/f_loopback.c           |   2 +-
> drivers/usb/gadget/function/f_midi.c               |   2 +-
> drivers/usb/gadget/function/f_midi2.c              |   2 +-
> drivers/usb/gadget/function/f_sourcesink.c         |   2 +-
> drivers/usb/gadget/u_f.c                           |   2 +-
> .../gadget/u_f.h => include/linux/usb/func_utils.h |   2 +-
> net/9p/Kconfig                                     |   6 +
> net/9p/Makefile                                    |   4 +
> net/9p/trans_usbg.c                                | 985 +++++++++++++++++++++
> tools/usb/p9_fwd.py                                | 243 +++++
> 14 files changed, 1304 insertions(+), 10 deletions(-)
>---
>base-commit: 2c9b3512402ed192d1f43f4531fb5da947e72bd0
>change-id: 20240116-ml-topic-u9p-895274530eb1
>
>Best regards,
>-- 
>Michael Grzeschik <m.grzeschik@pengutronix.de>
>
>

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