diff --git a/ironic_python_agent/hardware_managers/cna.py b/ironic_python_agent/hardware_managers/cna.py
index 6998422ae..2d49d9e03 100644
--- a/ironic_python_agent/hardware_managers/cna.py
+++ b/ironic_python_agent/hardware_managers/cna.py
@@ -69,29 +69,20 @@ def _disable_embedded_lldp_agent_in_cna_card():
                     .format(str(failed_dirs).strip('[]')))
 
 
-class IntelCnaHardwareManager(hardware.GenericHardwareManager):
+class IntelCnaHardwareManager(hardware.HardwareManager):
     HARDWARE_MANAGER_NAME = 'IntelCnaHardwareManager'
     HARDWARE_MANAGER_VERSION = '1.0'
 
     def evaluate_hardware_support(self):
         if _detect_cna_card():
             LOG.debug('Found Intel CNA network card')
+            # On Intel CNA cards, in order to make LLDP info collecting
+            # possible, the embedded LLDP agent, which runs inside that
+            # card, needs to be turned off.
+            if CONF.collect_lldp:
+                LOG.info('Disable CNA network card embedded lldp agent now')
+                _disable_embedded_lldp_agent_in_cna_card()
             return hardware.HardwareSupport.MAINLINE
         else:
             LOG.debug('No Intel CNA network card found')
             return hardware.HardwareSupport.NONE
-
-    def collect_lldp_data(self, interface_names):
-        """Collect and convert LLDP info from the node.
-
-        On Intel CNA cards, in order to make LLDP info collecting possible,
-        the embedded LLDP agent, which runs inside that card, needs to be
-        turned off. Then we can give the control back to the super class.
-
-        :param interface_names: list of names of node's interfaces.
-        :return: a dict, containing the lldp data from every interface.
-        """
-
-        _disable_embedded_lldp_agent_in_cna_card()
-        return super(IntelCnaHardwareManager, self).collect_lldp_data(
-            interface_names)
diff --git a/ironic_python_agent/tests/unit/hardware_managers/test_cna.py b/ironic_python_agent/tests/unit/hardware_managers/test_cna.py
index 3253ad4cf..78967b92b 100644
--- a/ironic_python_agent/tests/unit/hardware_managers/test_cna.py
+++ b/ironic_python_agent/tests/unit/hardware_managers/test_cna.py
@@ -118,12 +118,29 @@ class TestIntelCnaHardwareManager(base.IronicAgentTest):
 
     @mock.patch.object(cna, 'LOG', autospec=True)
     @mock.patch.object(cna, '_detect_cna_card', autospec=True)
-    def test_evaluate_hardware_support(self, mock_detect_card, mock_log):
+    def test_evaluate_hardware_support_with_collect_lldp_disabled(
+            self, mock_detect_card, mock_log):
         mock_detect_card.return_value = True
         expected_support = hardware.HardwareSupport.MAINLINE
         actual_support = self.hardware.evaluate_hardware_support()
         self.assertEqual(expected_support, actual_support)
-        mock_log.debug.assert_called_once()
+        mock_log.debug.assert_called_once_with('Found Intel CNA network card')
+
+    @mock.patch.object(cna, 'LOG', autospec=True)
+    @mock.patch.object(cna, '_detect_cna_card', autospec=True)
+    @mock.patch.object(cna, '_disable_embedded_lldp_agent_in_cna_card',
+                       autospec=True)
+    def test_evaluate_hardware_support_with_collect_lldp_enabled(
+            self, mock_disable_lldp_agent, mock_detect_card, mock_log):
+        self.config(collect_lldp=True)
+        mock_detect_card.return_value = True
+        expected_support = hardware.HardwareSupport.MAINLINE
+        actual_support = self.hardware.evaluate_hardware_support()
+        self.assertEqual(expected_support, actual_support)
+        mock_log.debug.assert_called_once_with('Found Intel CNA network card')
+        mock_log.info.assert_called_once_with(
+            'Disable CNA network card embedded lldp agent now')
+        mock_disable_lldp_agent.assert_called_once_with()
 
     @mock.patch.object(cna, 'LOG', autospec=True)
     @mock.patch.object(cna, '_detect_cna_card', autospec=True)
@@ -134,20 +151,5 @@ class TestIntelCnaHardwareManager(base.IronicAgentTest):
         expected_support = hardware.HardwareSupport.NONE
         actual_support = self.hardware.evaluate_hardware_support()
         self.assertEqual(expected_support, actual_support)
-        mock_log.debug.assert_called_once()
-
-    @mock.patch.object(hardware.GenericHardwareManager, 'collect_lldp_data',
-                       autospec=True)
-    def test_collect_lldp_data(self, mock_super_collect):
-        iface_names = ['eth0', 'eth1']
-        returned_lldp_data = [
-            (0, 'foo'),
-            (1, 'bar'),
-        ]
-        mock_super_collect.return_value = returned_lldp_data
-        with mock.patch.object(cna, '_disable_embedded_lldp_agent_in_cna_card',
-                               autospec=True):
-            result = self.hardware.collect_lldp_data(iface_names)
-            mock_super_collect.assert_called_once_with(self.hardware,
-                                                       iface_names)
-            self.assertEqual(returned_lldp_data, result)
+        mock_log.debug.assert_called_once_with(
+            'No Intel CNA network card found')
diff --git a/releasenotes/notes/fix-mlnx-hardware-mgr-never-run-72072580be4d6e7a.yaml b/releasenotes/notes/fix-mlnx-hardware-mgr-never-run-72072580be4d6e7a.yaml
new file mode 100644
index 000000000..28aaf1c4b
--- /dev/null
+++ b/releasenotes/notes/fix-mlnx-hardware-mgr-never-run-72072580be4d6e7a.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixes an issue with the IntelCnaHardwareManager which prevented hardware
+    managers with lower priority to be executed and therefore may blocked the
+    initialization and collection of hardware these managers are supposed to take
+    care of.