[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 2/2] tests: test rx recovery from cont
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] tests: test rx recovery from cont |
Date: |
Wed, 8 Jul 2015 13:48:20 +0800 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Wed, 07/08 13:44, Fam Zheng wrote:
> On Wed, 07/08 13:12, Jason Wang wrote:
> >
> >
> > On 07/08/2015 11:22 AM, Fam Zheng wrote:
> > > On Tue, 07/07 18:58, Jason Wang wrote:
> > >> Rx should be recovered after cont.
> > >>
> > >> Signed-off-by: Jason Wang <address@hidden>
> > >> ---
> > >> tests/virtio-net-test.c | 48
> > >> ++++++++++++++++++++++++++++++++++++++++++++++++
> > >> 1 file changed, 48 insertions(+)
> > >>
> > >> diff --git a/tests/virtio-net-test.c b/tests/virtio-net-test.c
> > >> index 97aa442..aeae80c 100644
> > >> --- a/tests/virtio-net-test.c
> > >> +++ b/tests/virtio-net-test.c
> > >> @@ -138,6 +138,45 @@ static void tx_test(const QVirtioBus *bus,
> > >> QVirtioDevice *dev,
> > >> g_assert_cmpstr(buffer, ==, "TEST");
> > >> }
> > >>
> > >> +static void rx_stop_cont_test(const QVirtioBus *bus, QVirtioDevice *dev,
> > >> + QGuestAllocator *alloc, QVirtQueue *vq,
> > >> + int socket)
> > >> +{
> > >> + uint64_t req_addr;
> > >> + uint32_t free_head;
> > >> + char test[] = "TEST";
> > >> + char buffer[64];
> > >> + int len = htonl(sizeof(test));
> > >> + struct iovec iov[] = {
> > >> + {
> > >> + .iov_base = &len,
> > >> + .iov_len = sizeof(len),
> > >> + }, {
> > >> + .iov_base = test,
> > >> + .iov_len = sizeof(test),
> > >> + },
> > >> + };
> > >> + int ret;
> > >> +
> > >> + req_addr = guest_alloc(alloc, 64);
> > >> +
> > >> + free_head = qvirtqueue_add(vq, req_addr, 64, true, false);
> > >> + qvirtqueue_kick(bus, dev, vq, free_head);
> > >> +
> > >> + qmp("{ 'execute' : 'stop'}");
> > >> +
> > >> + ret = iov_send(socket, iov, 2, 0, sizeof(len) + sizeof(test));
> > >> + g_assert_cmpint(ret, ==, sizeof(test) + sizeof(len));
> > > Maybe add a small lag here? The next "cont" could be too early that is
> > > noticed
> > > earlier than the packet.
> >
> > I'm not sure I get the point of this. But at any case, rx should be
> > recovered. (Btw, current qemu.git will fail in this case).
>
> If 'cont' and the packet land in main loop in the same qemu_poll_ns(), it's
> possible that the packet is processed before 'stop'.
Sorry, I meant after 'cont'.
Fam
>
> A trick is using qmp commands as barriers:
>
> qmp("{ 'execute' : 'stop'}");
>
> ret = iov_send(socket, iov, 2, 0, sizeof(len) + sizeof(test));
> g_assert_cmpint(ret, ==, sizeof(test) + sizeof(len));
>
> /* We could check the status, but this command is more importantly to
> * ensure the packet data gets queued in QEMU, before we do 'cont'.
> */
> qmp("{ 'execute' : 'query-status'}");
> qmp("{ 'execute' : 'cont'}");
>
> Fam
>
> >
> > >
> > >> +
> > >> + qmp("{ 'execute' : 'cont'}");
> > >> +
> > >> + qvirtio_wait_queue_isr(bus, dev, vq, QVIRTIO_NET_TIMEOUT_US);
> > >> + memread(req_addr + 12, buffer, sizeof(test));
> > >> + g_assert_cmpstr(buffer, ==, "TEST");
> > >> +
> > >> + guest_free(alloc, req_addr);
> > >> +}
> > >> +
> > >> static void send_recv_test(const QVirtioBus *bus, QVirtioDevice *dev,
> > >> QGuestAllocator *alloc, QVirtQueue *rvq,
> > >> QVirtQueue *tvq, int socket)
> > >> @@ -146,6 +185,13 @@ static void send_recv_test(const QVirtioBus *bus,
> > >> QVirtioDevice *dev,
> > >> tx_test(bus, dev, alloc, tvq, socket);
> > >> }
> > >>
> > >> +static void stop_cont_test(const QVirtioBus *bus, QVirtioDevice *dev,
> > >> + QGuestAllocator *alloc, QVirtQueue *rvq,
> > >> + QVirtQueue *tvq, int socket)
> > >> +{
> > >> + rx_stop_cont_test(bus, dev, alloc, rvq, socket);
> > >> +}
> > >> +
> > >> static void pci_basic(gconstpointer data)
> > >> {
> > >> QVirtioPCIDevice *dev;
> > >> @@ -204,6 +250,8 @@ int main(int argc, char **argv)
> > >> g_test_init(&argc, &argv, NULL);
> > >> #ifndef _WIN32
> > >> qtest_add_data_func("/virtio/net/pci/basic", send_recv_test,
> > >> pci_basic);
> > >> + qtest_add_data_func("/virtio/net/pci/rx_stop_cont",
> > >> + stop_cont_test, pci_basic);
> > >> #endif
> > >> qtest_add_func("/virtio/net/pci/hotplug", hotplug);
> > >>
> > >> --
> > >> 2.1.4
> > >>
> >
>
Re: [Qemu-devel] [PATCH 1/2] tests: introduce basic pci test for virtio-net, Fam Zheng, 2015/07/07