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-rw-r--r--test/vpp_pg_interface.py40
1 files changed, 32 insertions, 8 deletions
diff --git a/test/vpp_pg_interface.py b/test/vpp_pg_interface.py
index 756f79b5609..81737c6d567 100644
--- a/test/vpp_pg_interface.py
+++ b/test/vpp_pg_interface.py
@@ -1,8 +1,9 @@
import os
import time
import socket
-from traceback import format_exc
+from traceback import format_exc, format_stack
from scapy.utils import wrpcap, rdpcap, PcapReader
+from scapy.plist import PacketList
from vpp_interface import VppInterface
from scapy.layers.l2 import Ether, ARP
@@ -84,6 +85,7 @@ class VppPGInterface(VppInterface):
self._in_history_counter = 0
self._out_history_counter = 0
+ self._out_assert_counter = 0
self._pg_index = pg_index
self._out_file = "pg%u_out.pcap" % self.pg_index
self._out_path = self.test.tempdir + "/" + self._out_file
@@ -136,6 +138,22 @@ class VppPGInterface(VppInterface):
# FIXME this should be an API, but no such exists atm
self.test.vapi.cli(self.input_cli)
+ def generate_debug_aid(self, kind):
+ """ Create a hardlink to the out file with a counter and a file
+ containing stack trace to ease debugging in case of multiple capture
+ files present. """
+ self.test.logger.debug("Generating debug aid for %s on %s" %
+ (kind, self._name))
+ link_path, stack_path = ["%s/debug_%s_%s_%s.%s" %
+ (self.test.tempdir, self._name,
+ self._out_assert_counter, kind, suffix)
+ for suffix in ["pcap", "stack"]
+ ]
+ os.link(self.out_path, link_path)
+ with open(stack_path, "w") as f:
+ f.writelines(format_stack())
+ self._out_assert_counter += 1
+
def _get_capture(self, timeout, filter_out_fn=is_ipv6_misc):
""" Helper method to get capture and filter it """
try:
@@ -150,7 +168,7 @@ class VppPGInterface(VppInterface):
before = len(output.res)
if filter_out_fn:
output.res = [p for p in output.res if not filter_out_fn(p)]
- removed = len(output.res) - before
+ removed = before - len(output.res)
if removed:
self.test.logger.debug(
"Filtered out %s packets from capture (returning %s)" %
@@ -184,9 +202,6 @@ class VppPGInterface(VppInterface):
name)
self.test.logger.debug("Expecting to capture %s (%s) packets on %s" % (
expected_count, based_on, name))
- if expected_count == 0:
- raise Exception(
- "Internal error, expected packet count for %s is 0!" % name)
while remaining_time > 0:
before = time.time()
capture = self._get_capture(remaining_time, filter_out_fn)
@@ -195,8 +210,17 @@ class VppPGInterface(VppInterface):
if len(capture.res) == expected_count:
# bingo, got the packets we expected
return capture
+ else:
+ self.test.logger.debug("Partial capture containing %s "
+ "packets doesn't match expected "
+ "count %s (yet?)" %
+ (len(capture.res), expected_count))
+ elif expected_count == 0:
+ # bingo, got None as we expected - return empty capture
+ return PacketList()
remaining_time -= elapsed_time
if capture:
+ self.generate_debug_aid("count-mismatch")
raise Exception("Captured packets mismatch, captured %s packets, "
"expected %s packets on %s" %
(len(capture.res), expected_count, name))
@@ -214,13 +238,14 @@ class VppPGInterface(VppInterface):
try:
capture = self.get_capture(
0, remark=remark, filter_out_fn=filter_out_fn)
- if not capture:
+ if not capture or len(capture.res) == 0:
# junk filtered out, we're good
return
self.test.logger.error(
ppc("Unexpected packets captured:", capture))
except:
pass
+ self.generate_debug_aid("empty-assert")
if remark:
raise AssertionError(
"Non-empty capture file present for interface %s (%s)" %
@@ -278,8 +303,7 @@ class VppPGInterface(VppInterface):
break
except:
self.test.logger.debug(
- "Exception in scapy.PcapReader(%s): "
- "%s" %
+ "Exception in scapy.PcapReader(%s): %s" %
(self.out_path, format_exc()))
if not self._pcap_reader:
raise Exception("Capture file %s did not appear within "