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usb: document pcap (aka usb traffic capture) 

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20220711094437.3995927-3-kraxel@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
master
Gerd Hoffmann 2022-07-11 11:44:37 +02:00
parent f3a445b68e
commit 04fcb215b8
1 changed files with 12 additions and 0 deletions
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12
docs/system/devices/usb.rst
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@ -382,3 +382,15 @@ What works best pretty much depends on the behavior of the specific
usb device at hand, so it's a trial-and-error game. If the default
doesn't work, try another option and see whenever the situation
improves.
record usb transfers
^^^^^^^^^^^^^^^^^^^^
All usb devices have support for recording the usb traffic. This can
be enabled using the ``pcap=<file>`` property, for example:
``-device usb-mouse,pcap=mouse.pcap``
The pcap files are compatible with the linux kernels usbmon. Many
tools, including ``wireshark``, can decode and inspect these trace
files.