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authorGerd Hoffmann <kraxel@redhat.com>2022-07-11 11:44:37 +0200
committerGerd Hoffmann <kraxel@redhat.com>2022-07-19 14:36:42 +0200
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parentf3a445b68e7ed1d9fe14e3c92cfec38b1ac97331 (diff)
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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>
Diffstat (limited to 'docs')
-rw-r--r--docs/system/devices/usb.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/system/devices/usb.rst b/docs/system/devices/usb.rst
index 18e7c8b..f39a88f 100644
--- a/docs/system/devices/usb.rst
+++ b/docs/system/devices/usb.rst
@@ -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.