Re: [Qemu-devel] [PATCH V2] migration: expose qemu_announce_self() via qmp

[Markus Armbruster <armbru@redhat.com>]

Germano Veit Michel <germano@redhat.com> writes:

> Hi guys,
>
> Finally got some time to prepare V3.
>
> First of all Dave's trick is really useful to test it:
>
> ./x86_64-softmmu/qemu-system-x86_64 -nographic -nodefaults -netdev
> user,id=netuser -object filter-dump,id=dump,netdev=netuser,file=foo2
> -device e1000,netdev=netuser,mac=00:11:22:33:44:55 -monitor stdio
> QEMU 2.8.91 monitor - type 'help' for more information
> (qemu) announce-self
> (qemu) announce-self
> (qemu) qemu-system-x86_64: terminating on signal 2
>
> tshark -r foo2 | grep RARP
>     1   0.000000 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>     2   0.050017 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>     3   0.200077 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>     4   0.450112 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>     5   0.800090 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>    13   5.583887 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>    14   5.633079 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>    15   5.783152 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>    16   6.033130 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>    17   6.383144 Cimsys_33:44:55 → Broadcast    RARP 60 Who is
> 00:11:22:33:44:55? Tell 00:11:22:33:44:55
>
> Now for qtest:
>
> It is compiling and running my test:
>
>   [....]
>   CC      tests/qmp-net-test.o
>   LINK    tests/qmp-net-test
>   [....]
>   GTESTER check-qtest-x86_64
>
> /bin/sh -c printf "  %-7s %s\n" "GTESTER" "check-qtest-x86_64" &&
> QTEST_QEMU_BINARY=x86_64-softmmu/qemu-system-x86_64 QTEST_QEMU_IMG=qemu-img
> MALLOC_PERTURB_=${MALLOC_PERTURB_:-$((RANDOM % 255 + 1))} gtester -k -q
> -m=quick [.....] tests/qmp-net-test [....]
>
> Weird is... is the test qemu running without NICs?

Please show us test/qmp-net-test.c.

> x86_64-softmmu/qemu-system-x86_64 -qtest unix:/tmp/qtest-17545.sock,nowait
> -qtest-log /dev/null -qmp unix:/tmp/qtest-17545.qmp,nowait -machine
> accel=qtest -display none -M q35,accel=tcg -chardev
> file,id=serial0,path=/tmp/qtest-boot-serial-HYHJ2e -no-shutdown -serial
> chardev:serial0 -device sga
>
> I was looking at this
> http://events.linuxfoundation.org/sites/events/files/slides/Testing%20QEMU%20emulated%20devices%20using%20qtest.pdf
> and it's pretty helpful. But I have no clues on how to actually check if
> the RARP packets really go out on each NIC. Any idea on how to implement
> this or is the smoke test enough?

I'd try to use filter-dump to capture the traffic, then compare the
actual captured traffic to the expected one.