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

[Jason Wang]

On 2017年05月05日 14:13, Markus Armbruster wrote:
> Germano Veit Michel <address@hidden> 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.

Or use a socket backend like virtio-net-test.c.

Thanks