X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FNATUtil.py;h=620e14aea166e12ef7339bdaca8ed5b909605d77;hb=5764620e7a5c9f637da93b8c21a3b8f53abbdef1;hp=4ce72d84b480868972e8a2cdb364c1ad1d5357bf;hpb=00460a1ba11a6112a08256d39d927f2a309b1b99;p=csit.git

diff --git a/resources/libraries/python/NATUtil.py b/resources/libraries/python/NATUtil.py
index 4ce72d84b4..620e14aea1 100644
--- a/resources/libraries/python/NATUtil.py
+++ b/resources/libraries/python/NATUtil.py
@@ -13,6 +13,7 @@
 
 """NAT utilities library."""
 
+from math import log2, modf
 from pprint import pformat
 from enum import IntEnum
 
@@ -140,8 +141,10 @@ class NATUtil:
 
         :param node: Topology node.
         :type node: dict
+        :returns: NAT44 summary data.
+        :rtype: str
         """
-        PapiSocketExecutor.run_cli_cmd(node, u"show nat44 summary")
+        return PapiSocketExecutor.run_cli_cmd(node, u"show nat44 summary")
 
     @staticmethod
     def show_nat_base_data(node):
@@ -185,8 +188,47 @@ class NATUtil:
         ]
         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
+        """
+        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 established NAT44 sessions from actual NAT44 mapping
+        data.
+
+        :param node: DUT node.
+        :param proto: Required protocol - TCP/UDP/ICMP.
+        :type node: dict
+        :type proto: str
+        :returns: Number of established NAT44 sessions.
+        :rtype: int
+        :raises ValueError: If not supported protocol.
+        """
+        nat44_data = dict()
+        if proto in [u"UDP", u"TCP", u"ICMP"]:
+            for line in NATUtil.show_nat44_summary(node).splitlines():
+                sum_k, sum_v = line.split(u":") if u":" in line \
+                    else (line, None)
+                nat44_data[sum_k] = sum_v.strip() if isinstance(sum_v, str) \
+                    else sum_v
+        else:
+            raise ValueError(f"Unsupported protocol: {proto}!")
+        return nat44_data.get(f"total {proto.lower()} sessions", 0)
+
     # DET44 PAPI calls
-    # DET44 means deterministic mode of NAT
+    # DET44 means deterministic mode of NAT44
     @staticmethod
     def enable_det44_plugin(node, inside_vrf=0, outside_vrf=0):
         """Enable DET44 plugin.
@@ -261,6 +303,38 @@ class NATUtil:
         with PapiSocketExecutor(node) as papi_exec:
             papi_exec.add(cmd, **args_in).get_reply(err_msg)
 
+    @staticmethod
+    def get_det44_mapping(node):
+        """Get DET44 mapping data.
+
+        :param node: DUT node.
+        :type node: dict
+        :returns: Dictionary of DET44 mapping data.
+        :rtype: dict
+        """
+        cmd = u"det44_map_dump"
+        err_msg = f"Failed to get DET44 mapping data on the host " \
+            f"{node[u'host']}!"
+        args_in = dict()
+        with PapiSocketExecutor(node) as papi_exec:
+            details = papi_exec.add(cmd, **args_in).get_reply(err_msg)
+
+        return details
+
+    @staticmethod
+    def get_det44_sessions_number(node):
+        """Get number of established DET44 sessions from actual DET44 mapping
+        data.
+
+        :param node: DUT node.
+        :type node: dict
+        :returns: Number of established DET44 sessions.
+        :rtype: int
+        """
+        det44_data = NATUtil.get_det44_mapping(node)
+
+        return det44_data.get(u"ses_num", 0)
+
     @staticmethod
     def show_det44(node):
         """Show DET44 data.