qemu-iotests: add block-stream speed value test case

Add tests to exercise the InvalidParameter 'speed' error code path, as
well as the regular success case for setting the speed.  The
block-stream 'speed' parameter allows the speed limit of the job to be
applied immediately when the job starts instead of issuing a separate
block-job-set-speed command later.  If the parameter has an invalid
value we expect to get an error and the job is not created.

It turns out that cancelling a block job is a common operation in these
test cases, let's extract a cancel_and_wait() function instead of
duplicating the QMP commands.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

tests/qemu-iotests/030

@@ -32,6 +32,21 @@ class ImageStreamingTestCase(iotests.QMPTestCase):
         result = self.vm.qmp('query-block-jobs')
         self.assert_qmp(result, 'return', [])
 
+    def cancel_and_wait(self, drive='drive0'):
+        '''Cancel a block job and wait for it to finish'''
+        result = self.vm.qmp('block-job-cancel', device=drive)
+        self.assert_qmp(result, 'return', {})
+
+        cancelled = False
+        while not cancelled:
+            for event in self.vm.get_qmp_events(wait=True):
+                if event['event'] == 'BLOCK_JOB_CANCELLED':
+                    self.assert_qmp(event, 'data/type', 'stream')
+                    self.assert_qmp(event, 'data/device', drive)
+                    cancelled = True
+
+        self.assert_no_active_streams()
+
 class TestSingleDrive(ImageStreamingTestCase):
     image_len = 1 * 1024 * 1024 # MB
 
@@ -97,21 +112,8 @@ class TestStreamStop(ImageStreamingTestCase):
         events = self.vm.get_qmp_events(wait=False)
         self.assertEqual(events, [], 'unexpected QMP event: %s' % events)
 
-        self.vm.qmp('block-job-cancel', device='drive0')
+        self.cancel_and_wait()
-        self.assert_qmp(result, 'return', {})
 
-        cancelled = False
-        while not cancelled:
-            for event in self.vm.get_qmp_events(wait=True):
-                if event['event'] == 'BLOCK_JOB_CANCELLED':
-                    self.assert_qmp(event, 'data/type', 'stream')
-                    self.assert_qmp(event, 'data/device', 'drive0')
-                    cancelled = True
-
-        self.assert_no_active_streams()
-
-# This is a short performance test which is not run by default.
-# Invoke "IMGFMT=qed ./030 TestSetSpeed.perf_test_set_speed"
 class TestSetSpeed(ImageStreamingTestCase):
     image_len = 80 * 1024 * 1024 # MB
 
@@ -126,13 +128,15 @@ class TestSetSpeed(ImageStreamingTestCase):
         os.remove(test_img)
         os.remove(backing_img)
 
-    def perf_test_set_speed(self):
+    # This is a short performance test which is not run by default.
+    # Invoke "IMGFMT=qed ./030 TestSetSpeed.perf_test_throughput"
+    def perf_test_throughput(self):
         self.assert_no_active_streams()
 
         result = self.vm.qmp('block-stream', device='drive0')
         self.assert_qmp(result, 'return', {})
 
-        result = self.vm.qmp('block-job-set-speed', device='drive0', value=8 * 1024 * 1024)
+        result = self.vm.qmp('block-job-set-speed', device='drive0', speed=8 * 1024 * 1024)
         self.assert_qmp(result, 'return', {})
 
         completed = False
@@ -147,5 +151,54 @@ class TestSetSpeed(ImageStreamingTestCase):
 
         self.assert_no_active_streams()
 
+    def test_set_speed(self):
+        self.assert_no_active_streams()
+
+        result = self.vm.qmp('block-stream', device='drive0')
+        self.assert_qmp(result, 'return', {})
+
+        # Default speed is 0
+        result = self.vm.qmp('query-block-jobs')
+        self.assert_qmp(result, 'return[0]/device', 'drive0')
+        self.assert_qmp(result, 'return[0]/speed', 0)
+
+        result = self.vm.qmp('block-job-set-speed', device='drive0', speed=8 * 1024 * 1024)
+        self.assert_qmp(result, 'return', {})
+
+        # Ensure the speed we set was accepted
+        result = self.vm.qmp('query-block-jobs')
+        self.assert_qmp(result, 'return[0]/device', 'drive0')
+        self.assert_qmp(result, 'return[0]/speed', 8 * 1024 * 1024)
+
+        self.cancel_and_wait()
+
+        # Check setting speed in block-stream works
+        result = self.vm.qmp('block-stream', device='drive0', speed=4 * 1024 * 1024)
+        self.assert_qmp(result, 'return', {})
+
+        result = self.vm.qmp('query-block-jobs')
+        self.assert_qmp(result, 'return[0]/device', 'drive0')
+        self.assert_qmp(result, 'return[0]/speed', 4 * 1024 * 1024)
+
+        self.cancel_and_wait()
+
+    def test_set_speed_invalid(self):
+        self.assert_no_active_streams()
+
+        result = self.vm.qmp('block-stream', device='drive0', speed=-1)
+        self.assert_qmp(result, 'error/class', 'InvalidParameter')
+        self.assert_qmp(result, 'error/data/name', 'speed')
+
+        self.assert_no_active_streams()
+
+        result = self.vm.qmp('block-stream', device='drive0')
+        self.assert_qmp(result, 'return', {})
+
+        result = self.vm.qmp('block-job-set-speed', device='drive0', speed=-1)
+        self.assert_qmp(result, 'error/class', 'InvalidParameter')
+        self.assert_qmp(result, 'error/data/name', 'speed')
+
+        self.cancel_and_wait()
+
 if __name__ == '__main__':
     iotests.main(supported_fmts=['qcow2', 'qed'])

tests/qemu-iotests/030.out

@@ -1,5 +1,5 @@
-...
+.....
 ----------------------------------------------------------------------
-Ran 3 tests
+Ran 5 tests
 
 OK