This patch adds a missing topology loopback mode for port-topology
option in testpmd guide. The testpmd loopback option
(PORT_TOPOLOGY_LOOP)  was added to testpmd parameter
port-topology back in 2014, but it seems that it was never added
to the testpmd guide. This patch adds it in the testpmd guide.

Fixes: 3e2006d6186c ("app/testpmd: add loopback topology")
Signed-off-by: Rami Rosen <>
 doc/guides/testpmd_app_ug/run_app.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/guides/testpmd_app_ug/run_app.rst 
index f717bd3..ee51b1d 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -196,7 +196,7 @@ The commandline options are:
 *   ``--port-topology=mode``
-    Set port topology, where mode is ``paired`` (the default) or ``chained``.
+    Set port topology, where mode is ``paired`` (the default), ``chained`` or 
     In ``paired`` mode, the forwarding is between pairs of ports, for example: 
(0,1), (2,3), (4,5).
@@ -204,6 +204,8 @@ The commandline options are:
     The ordering of the ports can be changed using the portlist testpmd 
runtime function.
+    In ``loopback`` mode, ingress traffic is simply transmitted back on the 
same interface.
 *   ``--forward-mode=mode``
     Set the forwarding mode where ``mode`` is one of the following::

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