+ # A closure, accessing the variables above.
+ def resetter():
+ """Delete and re-add the NAT range setting."""
+ with PapiSocketExecutor(node) as papi_exec:
+ args_in[u"is_add"] = False
+ papi_exec.add(cmd, **args_in)
+ args_in[u"is_add"] = True
+ papi_exec.add(cmd, **args_in)
+ papi_exec.get_replies(err_msg)
+
+ return resetter
+
+ @staticmethod
+ def show_nat44_config(node):
+ """Show the NAT44 plugin running configuration.
+
+ :param node: DUT node.
+ :type node: dict
+ """
+ cmd = u"nat44_show_running_config"
+ err_msg = f"Failed to get NAT44 configuration on host {node[u'host']}"
+
+ with PapiSocketExecutor(node) as papi_exec:
+ reply = papi_exec.add(cmd).get_reply(err_msg)
+
+ logger.debug(f"NAT44 Configuration:\n{pformat(reply)}")
+
+ @staticmethod
+ def show_nat44_summary(node):
+ """Show NAT44 summary on the specified topology node.
+
+ :param node: Topology node.
+ :type node: dict
+ :returns: NAT44 summary data.
+ :rtype: str
+ """
+ return PapiSocketExecutor.run_cli_cmd(node, u"show nat44 summary")
+
+ @staticmethod
+ def show_nat_base_data(node):
+ """Show the NAT base data.
+
+ Used data sources:
+
+ nat_worker_dump
+ nat44_interface_addr_dump
+ nat44_address_dump
+ nat44_static_mapping_dump
+ nat44_interface_dump
+
+ :param node: DUT node.
+ :type node: dict
+ """
+ cmds = [
+ u"nat_worker_dump",
+ u"nat44_interface_addr_dump",
+ u"nat44_address_dump",
+ u"nat44_static_mapping_dump",
+ u"nat44_interface_dump",
+ ]
+ PapiSocketExecutor.dump_and_log(node, cmds)
+
+ @staticmethod
+ def show_nat_user_data(node):
+ """Show the NAT user data.
+
+ Used data sources:
+
+ nat44_user_dump
+ nat44_user_session_dump
+
+ :param node: DUT node.
+ :type node: dict
+ """
+ cmds = [
+ u"nat44_user_dump",
+ u"nat44_user_session_dump",
+ ]
+ PapiSocketExecutor.dump_and_log(node, cmds)
+
+ @staticmethod
+ def compute_max_translations_per_thread(sessions, threads):
+ """Compute value of max_translations_per_thread NAT44 parameter based on
+ total number of worker threads.
+
+ :param sessions: Required number of NAT44 sessions.
+ :param threads: Number of worker threads.
+ :type sessions: int
+ :type threads: int
+ :returns: Value of max_translations_per_thread NAT44 parameter.
+ :rtype: int
+ """
+ # vpp-device tests have not dedicated physical core so
+ # ${dp_count_int} == 0 but we need to use one thread
+ threads = 1 if not int(threads) else int(threads)
+ rest, mult = modf(log2(sessions/(10*threads)))
+ return 2 ** (int(mult) + (1 if rest else 0)) * 10
+
+ @staticmethod
+ def get_nat44_sessions_number(node, proto):
+ """Get number of expected NAT44 sessions from NAT44 mapping data.
+
+ This keyword uses output from a CLI command,
+ so it can start failing when VPP changes the output format.
+ TODO: Switch to API (or stat segment) when available.
+
+ The current implementation supports both 2202 and post-2202 format.
+ (The Gerrit number changing the output format is 34877.)
+
+ For TCP proto, the expected state after rampup is
+ some number of sessions in transitory state (VPP has seen the FINs),
+ and some number of sessions in established state (meaning
+ some FINs were lost in the last trial).
+ While the two states may need slightly different number of cycles
+ to process next packet, the current implementation considers
+ both of them the "fast path", so they are both counted as expected.
+
+ As the tests should fail if a session is timed-out,
+ the logic substracts timed out sessions for the returned value
+ (only available for post-2202 format).
+
+ TODO: Investigate if it is worth to insert additional rampup trials
+ in TPUT tests to ensure all sessions are transitory before next
+ measurement.
+
+ :param node: DUT node.
+ :param proto: Required protocol - TCP/UDP/ICMP.
+ :type node: dict
+ :type proto: str
+ :returns: Number of active established NAT44 sessions.
+ :rtype: int
+ :raises ValueError: If not supported protocol.
+ :raises RuntimeError: If output is not formatted as expected.
+ """
+ proto_l = proto.strip().lower()
+ if proto_l not in [u"udp", u"tcp", u"icmp"]:
+ raise ValueError(f"Unsupported protocol: {proto}!")
+ summary_text = NATUtil.show_nat44_summary(node)
+ summary_lines = summary_text.splitlines()
+ # Output from VPP v22.02 and before, delete when no longer needed.
+ pattern_2202 = f"total {proto_l} sessions:"
+ if pattern_2202 in summary_text:
+ for line in summary_lines:
+ if pattern_2202 not in line:
+ continue
+ return int(line.split(u":", 1)[1].strip())
+ # Post-2202, the proto info and session info are not on the same line.
+ found = False
+ for line in summary_lines:
+ if not found:
+ if f"{proto_l} sessions:" in line:
+ found = True
+ continue
+ # Proto is found, find the line we are interested in.
+ if u"total" not in line:
+ raise RuntimeError(f"show nat summary: no {proto} total.")
+ # We have the line with relevant numbers.
+ total_part, timed_out_part = line.split(u"(", 1)
+ timed_out_part = timed_out_part.split(u")", 1)[0]
+ total_count = int(total_part.split(u":", 1)[1].strip())
+ timed_out_count = int(timed_out_part.split(u":", 1)[1].strip())
+ active_count = total_count - timed_out_count
+ return active_count
+ raise RuntimeError(u"Unknown format of show nat44 summary")
+
+ # DET44 PAPI calls
+ # DET44 means deterministic mode of NAT44
+ @staticmethod
+ def enable_det44_plugin(node, inside_vrf=0, outside_vrf=0):
+ """Enable DET44 plugin.
+
+ :param node: DUT node.
+ :param inside_vrf: Inside VRF ID.
+ :param outside_vrf: Outside VRF ID.
+ :type node: dict
+ :type inside_vrf: str or int
+ :type outside_vrf: str or int
+ """
+ cmd = u"det44_plugin_enable_disable"
+ err_msg = f"Failed to enable DET44 plugin on the host {node[u'host']}!"