Re: [PATCH] net: Add "info neighbors" command

[Markus Armbruster <armbru@redhat.com>]

Doug Evans <dje@google.com> writes:

> This command dumps the ARP and NDP tables maintained within slirp.
> One use-case for it is showing the guest's IPv6 address(es).
>
> Signed-off-by: Doug Evans <dje@google.com>
> ---
>  hmp-commands-info.hx               | 15 +++++++
>  include/net/slirp.h                |  1 +
>  net/slirp.c                        | 15 +++++++
>  tests/acceptance/info_neighbors.py | 69 ++++++++++++++++++++++++++++++
>  4 files changed, 100 insertions(+)
>  create mode 100644 tests/acceptance/info_neighbors.py

Standard request for new HMP commands without corresponding QMP
commands: please state in the commit message why the QMP command is not
worthwhile.

HMP commands without a QMP equivalent are okay if their functionality
makes no sense in QMP, or is of use only for human users.

Example for "makes no sense in QMP": setting the current CPU, because a
QMP monitor doesn't have a current CPU.

Examples for "is of use only for human users": HMP command "help", the
integrated pocket calculator.

Debugging commands are kind of borderline.  Debugging is commonly a
human activity, where HMP is just fine.  However, humans create tools to
assist with their activities, and then QMP is useful.  While I wouldn't
encourage HMP-only for the debugging use case, I wouldn't veto it.