+ self.pg_start(trace=trace)
+
+ def snapshot_stats(self, stats_diff):
+ """Return snapshot of interesting stats based on diff dictionary."""
+ stats_snapshot = {}
+ for sw_if_index in stats_diff:
+ for counter in stats_diff[sw_if_index]:
+ stats_snapshot[counter] = self.statistics[counter]
+ self.logger.debug(f"Took statistics stats_snapshot: {stats_snapshot}")
+ return stats_snapshot
+
+ def compare_stats_with_snapshot(self, stats_diff, stats_snapshot):
+ """Assert appropriate difference between current stats and snapshot."""
+ for sw_if_index in stats_diff:
+ for cntr, diff in stats_diff[sw_if_index].items():
+ if sw_if_index == "err":
+ self.assert_equal(
+ self.statistics[cntr].sum(),
+ stats_snapshot[cntr].sum() + diff,
+ f"'{cntr}' counter value (previous value: "
+ f"{stats_snapshot[cntr].sum()}, "
+ f"expected diff: {diff})",
+ )
+ else:
+ try:
+ self.assert_equal(
+ self.statistics[cntr][:, sw_if_index].sum(),
+ stats_snapshot[cntr][:, sw_if_index].sum() + diff,
+ f"'{cntr}' counter value (previous value: "
+ f"{stats_snapshot[cntr][:, sw_if_index].sum()}, "
+ f"expected diff: {diff})",
+ )
+ except IndexError:
+ # if diff is 0, then this most probably a case where
+ # test declares multiple interfaces but traffic hasn't
+ # passed through this one yet - which means the counter
+ # value is 0 and can be ignored
+ if 0 != diff:
+ raise
+
+ def send_and_assert_no_replies(
+ self, intf, pkts, remark="", timeout=None, stats_diff=None, trace=True, msg=None
+ ):
+ if stats_diff:
+ stats_snapshot = self.snapshot_stats(stats_diff)
+
+ self.pg_send(intf, pkts)
+
+ try:
+ if not timeout:
+ timeout = 1
+ for i in self.pg_interfaces:
+ i.assert_nothing_captured(timeout=timeout, remark=remark)
+ timeout = 0.1
+ finally:
+ if trace:
+ if msg:
+ self.logger.debug(f"send_and_assert_no_replies: {msg}")
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ if stats_diff:
+ self.compare_stats_with_snapshot(stats_diff, stats_snapshot)
+
+ def send_and_expect(
+ self,
+ intf,
+ pkts,
+ output,
+ n_rx=None,
+ worker=None,
+ trace=True,
+ msg=None,
+ stats_diff=None,
+ ):
+ if stats_diff:
+ stats_snapshot = self.snapshot_stats(stats_diff)
+
+ if not n_rx:
+ n_rx = 1 if isinstance(pkts, Packet) else len(pkts)
+ self.pg_send(intf, pkts, worker=worker, trace=trace)
+ rx = output.get_capture(n_rx)
+ if trace:
+ if msg:
+ self.logger.debug(f"send_and_expect: {msg}")
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ if stats_diff:
+ self.compare_stats_with_snapshot(stats_diff, stats_snapshot)
+
+ return rx
+
+ def send_and_expect_load_balancing(
+ self, input, pkts, outputs, worker=None, trace=True
+ ):
+ self.pg_send(input, pkts, worker=worker, trace=trace)
+ rxs = []
+ for oo in outputs:
+ rx = oo._get_capture(1)
+ self.assertNotEqual(0, len(rx))
+ rxs.append(rx)
+ if trace:
+ self.logger.debug(self.vapi.cli("show trace"))
+ return rxs
+
+ def send_and_expect_some(self, intf, pkts, output, worker=None, trace=True):
+ self.pg_send(intf, pkts, worker=worker, trace=trace)
+ rx = output._get_capture(1)
+ if trace:
+ self.logger.debug(self.vapi.cli("show trace"))
+ self.assertTrue(len(rx) > 0)
+ self.assertTrue(len(rx) < len(pkts))
+ return rx
+
+ def send_and_expect_only(self, intf, pkts, output, timeout=None, stats_diff=None):
+ if stats_diff:
+ stats_snapshot = self.snapshot_stats(stats_diff)
+
+ self.pg_send(intf, pkts)
+ rx = output.get_capture(len(pkts))
+ outputs = [output]