diff --git a/ansible/group_vars/sonic/variables b/ansible/group_vars/sonic/variables
index cdfae728cbe..79f0c5f9c13 100644
--- a/ansible/group_vars/sonic/variables
+++ b/ansible/group_vars/sonic/variables
@@ -20,7 +20,7 @@ broadcom_jr2_hwskus: ['Arista-7800R3-48CQ2-C48', 'Arista-7800R3-48CQM2-C48']
 mellanox_spc1_hwskus: [ 'ACS-MSN2700', 'ACS-MSN2740', 'ACS-MSN2100', 'ACS-MSN2410', 'ACS-MSN2010', 'Mellanox-SN2700', 'Mellanox-SN2700-A1', 'Mellanox-SN2700-D48C8','Mellanox-SN2700-D40C8S8', 'Mellanox-SN2700-A1-D48C8']
 mellanox_spc2_hwskus: [ 'ACS-MSN3700', 'ACS-MSN3700C', 'ACS-MSN3800', 'Mellanox-SN3800-D112C8' , 'ACS-MSN3420']
 mellanox_spc3_hwskus: [ 'ACS-MSN4700', 'Mellanox-SN4700-O28', 'ACS-MSN4600', 'ACS-MSN4600C', 'ACS-MSN4410', 'Mellanox-SN4600C-D112C8', 'Mellanox-SN4600C-C64', 'Mellanox-SN4700-O8C48', 'Mellanox-SN4700-O8V48', 'ACS-SN4280']
-mellanox_spc4_hwskus: [ 'ACS-SN5600' ]
+mellanox_spc4_hwskus: [ 'ACS-SN5600' , 'Mellanox-SN5600-V256']
 mellanox_hwskus: "{{ mellanox_spc1_hwskus + mellanox_spc2_hwskus + mellanox_spc3_hwskus + mellanox_spc4_hwskus }}"
 mellanox_dualtor_hwskus: [ 'Mellanox-SN4600C-C64' ]
 
diff --git a/ansible/module_utils/port_utils.py b/ansible/module_utils/port_utils.py
index 3abdbd0241a..6e17fd65a9a 100644
--- a/ansible/module_utils/port_utils.py
+++ b/ansible/module_utils/port_utils.py
@@ -377,6 +377,13 @@ def get_port_alias_to_name_map(hwsku, asic_name=None):
             for i in range(1, 33):
                 port_alias_to_name_map["etp%d" % i] = "Ethernet%d" % idx
                 idx += 8
+        elif hwsku == "Mellanox-SN5600-V256":
+            split_alias_list = ["a", "b", "c", "d"]
+            for i in range(1, 65):
+                for idx, split_alias in enumerate(split_alias_list):
+                    alias = "etp{}{}".format(i, split_alias)
+                    eth_name = "Ethernet{}".format((i - 1) * 8 + idx * 2)
+                    port_alias_to_name_map[alias] = eth_name
         elif hwsku == "Arista-7060DX5-32":
             for i in range(1, 33):
                 port_alias_to_name_map["Ethernet%d/1" % i] = "Ethernet%d" % ((i - 1) * 8)
diff --git a/tests/common/mellanox_data.py b/tests/common/mellanox_data.py
index c7f9aa6b18b..ef5cb223186 100644
--- a/tests/common/mellanox_data.py
+++ b/tests/common/mellanox_data.py
@@ -6,7 +6,7 @@
 SPC2_HWSKUS = ["ACS-MSN3700", "ACS-MSN3700C", "ACS-MSN3800", "Mellanox-SN3800-D112C8", "ACS-MSN3420"]
 SPC3_HWSKUS = ["ACS-MSN4700", "Mellanox-SN4700-O28", "ACS-MSN4600C", "ACS-MSN4410", "ACS-MSN4600",
                "Mellanox-SN4600C-D112C8", "Mellanox-SN4600C-C64"]
-SPC4_HWSKUS = ["ACS-SN5600"]
+SPC4_HWSKUS = ["ACS-SN5600", "Mellanox-SN5600-V256"]
 SWITCH_HWSKUS = SPC1_HWSKUS + SPC2_HWSKUS + SPC3_HWSKUS + SPC4_HWSKUS
 
 PSU_CAPABILITIES = [
diff --git a/tests/saitests/py3/sai_qos_tests.py b/tests/saitests/py3/sai_qos_tests.py
index 28a90b11dc1..dd9366fddff 100755
--- a/tests/saitests/py3/sai_qos_tests.py
+++ b/tests/saitests/py3/sai_qos_tests.py
@@ -3123,7 +3123,7 @@ def runTest(self):
                         self.sai_thrift_port_tx_enable(self.dst_client, self.asic_type, self.uniq_dst_ports)
                     sys.exit("Too many pkts needed to trigger pfc: %d" % (pkt_cnt))
                 assert (recv_counters[sidx_dscp_pg_tuples[i][2]] >
-                       recv_counters_bases[sidx_dscp_pg_tuples[i][0]][sidx_dscp_pg_tuples[i][2]])
+                        recv_counters_bases[sidx_dscp_pg_tuples[i][0]][sidx_dscp_pg_tuples[i][2]])
                 print("%d packets for sid: %d, pg: %d to trigger pfc" % (
                     pkt_cnt, self.src_port_ids[sidx_dscp_pg_tuples[i][0]], sidx_dscp_pg_tuples[i][2] - 2),
                     file=sys.stderr)
@@ -5046,7 +5046,7 @@ def runTest(self):
 
             if pkts_num_fill_min:
                 assert (q_wm_res[queue] == 0)
-            elif 'cisco-8000' in asic_type or "ACS-SN5600" in hwsku:
+            elif 'cisco-8000' in asic_type or "SN5600" in hwsku:
                 assert (q_wm_res[queue] <= (margin + 1) * cell_size)
             else:
                 if platform_asic and platform_asic == "broadcom-dnx":
@@ -5366,8 +5366,7 @@ def runTest(self):
                       file=sys.stderr,
                 )
                 assert (buffer_pool_wm <= (expected_wm + upper_bound_margin) * cell_size)
-                assert ((expected_wm - lower_bound_margin)
-                       * cell_size <= buffer_pool_wm)
+                assert ((expected_wm - lower_bound_margin) * cell_size <= buffer_pool_wm)
 
                 pkts_num = pkts_inc
 
@@ -5561,8 +5560,7 @@ def runTest(self):
             if 'cisco-8000' in asic_type:
                 # Queue is always the inner_dscp due to the TC_TO_QUEUE_MAP redirection
                 queue = inner_dscp
-                assert (fill_leakout_plus_one(self, src_port_id,
-                       dst_port_id, pkt, queue, asic_type))
+                assert (fill_leakout_plus_one(self, src_port_id, dst_port_id, pkt, queue, asic_type))
                 num_pkts = pkts_num_trig_pfc - pkts_num_margin - 1
                 send_packet(self, src_port_id, pkt, num_pkts)
                 print("Sending {} packets to port {}".format(num_pkts, src_port_id), file=sys.stderr)