tc: fix get_qdiscs(index=...)

The old version could filter qdiscs by the interface index, fix that
in the new API.

Bug-Url: #1225

pyroute2/iproute/linux.py

@@ -416,7 +416,7 @@ async def get_qdiscs(self, index=None):
 
         A compatibility method, == .tc("dump")
         '''
-        return await self.tc('dump')
+        return await self.tc('dump', index=index)
 
     async def get_filters(self, index=0, handle=0, parent=0):
         '''

tests/test_core/pr2test/tools.py

@@ -126,13 +126,15 @@ def filter_exists(
 
 
 def qdisc_exists(
-    ifname, handle, default=None, netns=None, timeout=1, retry=0.2
+    ifname, handle, default=None, rate=None, netns=None, timeout=1, retry=0.2
 ):
     filters = [ip_object_filter(query='.handle', value=handle)]
     if default is not None:
         filters.append(
             ip_object_filter(query='.options.default', value=default)
         )
+    if rate is not None:
+        filters.append(ip_object_filter(query='.options.rate', value=rate))
     return wait_for_ip_object(
         ['tc', '-json', 'qdisc', 'show', 'dev', ifname],
         filters,

tests/test_core/test_ipr/test_tc_async.py

@@ -13,16 +13,35 @@ async def util_link_add(async_ipr):
     ifname = async_ipr.register_temporary_ifname()
     await async_ipr.link('add', ifname=ifname, kind='dummy', state='up')
     assert interface_exists(ifname)
-    return ifname
+    (link,) = await async_ipr.link('get', ifname=ifname)
+    index = link['index']
+    return ifname, index
+
+
+@pytest.mark.asyncio
+async def test_tc_get_qdiscs(async_ipr):
+    root_handle = '1:'
+    ifname, index = await util_link_add(async_ipr)
+    await async_ipr.tc(
+        'add',
+        'tbf',
+        index=index,
+        handle=root_handle,
+        rate=256,
+        burst=256,
+        latency=1,
+    )
+    assert qdisc_exists(ifname=ifname, handle=root_handle, rate=256)
+    assert len([x async for x in await async_ipr.get_qdiscs(index=index)]) == 1
+    await async_ipr.tc('del', index=index, handle=root_handle, root=True)
+    assert not qdisc_exists(ifname=ifname, handle=root_handle, rate=256)
 
 
 @pytest.mark.asyncio
 async def test_tc_htb(async_ipr):
     root_handle = '1:'
     root_options_default = '0x200000'
-    ifname = await util_link_add(async_ipr)
-    (link,) = await async_ipr.link('get', ifname=ifname)
-    index = link['index']
+    ifname, index = await util_link_add(async_ipr)
     await async_ipr.tc(
         'add',
         'htb',