router: slow-path in async packet processing (scionproto#4383)

Add a low-priority slow path for special case packet handling, in particular SCMP errors and traceroutes, for the the asynchronous packet processing pipeline in the router added in scionproto#4351. This is implementation part three of three described in the design document (scionproto#4339, doc/dev/design/BorderRouter.rst). Closes scionproto#4334
jiceatscion · Sep 28, 2023 · 31b03ec · 31b03ec
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diff --git a/doc/manuals/router.rst b/doc/manuals/router.rst
@@ -160,8 +160,8 @@ considers the following options.
 
    .. option:: router.num_slow_processors = <int> (Default: 1)
 
-      Number of goroutines started for the slow-path processing. This feature will be implemented soon. Currently
-      this setting has no effect.
+      Number of goroutines started for the slow-path processing which includes all SCMP traffic and traceroutes.
+      A minimum of 1 slow-path processor is required.
 
    .. option:: router.batch_size = <int> (Default: 256)