Add support for Infiniband network interfaces (IPoIB).

OpenStack ironic references Infiniband interfaces via a 6 byte 'MAC
address' formed from bytes 13-15 and 18-20 of interface's hardware
address. This address is used as the ethernet_mac_address of Infiniband
links in network_data.json in configdrives generated by OpenStack nova.
We can use this address to map links in network_data.json to their
corresponding interface names.

When generating interface configuration files, we need to use the
interface's full hardware address as the HWADDR, rather than the 6 byte
MAC address provided by network_data.json.

This change allows IB interfaces to be referenced in this dual mode - by
MAC address and hardware address, depending on the context.

Support TYPE=InfiniBand for sysconfig configuration of IB interfaces.

3 files changed, 56 insertions, 0 deletions

diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 5e87bcad..f83d3681 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -569,6 +569,20 @@ def get_interface_mac(ifname):
     return read_sys_net_safe(ifname, path)
 
 
+def get_ib_interface_hwaddr(ifname, ethernet_format):
+    """Returns the string value of an Infiniband interface's hardware
+    address. If ethernet_format is True, an Ethernet MAC-style 6 byte
+    representation of the address will be returned.
+    """
+    # Type 32 is Infiniband.
+    if read_sys_net_safe(ifname, 'type') == '32':
+        mac = get_interface_mac(ifname)
+        if mac and ethernet_format:
+            # Use bytes 13-15 and 18-20 of the hardware address.
+            mac = mac[36:-14] + mac[51:]
+        return mac
+
+
 def get_interfaces_by_mac():
     """Build a dictionary of tuples {mac: name}.
 
@@ -580,6 +594,15 @@ def get_interfaces_by_mac():
                 "duplicate mac found! both '%s' and '%s' have mac '%s'" %
                 (name, ret[mac], mac))
         ret[mac] = name
+        # Try to get an Infiniband hardware address (in 6 byte Ethernet format)
+        # for the interface.
+        ib_mac = get_ib_interface_hwaddr(name, True)
+        if ib_mac:
+            if ib_mac in ret:
+                raise RuntimeError(
+                    "duplicate mac found! both '%s' and '%s' have mac '%s'" %
+                    (name, ret[ib_mac], ib_mac))
+            ret[ib_mac] = name
     return ret
 
 
@@ -607,6 +630,21 @@ def get_interfaces():
     return ret
 
 
+def get_ib_hwaddrs_by_interface():
+    """Build a dictionary mapping Infiniband interface names to their hardware
+    address."""
+    ret = {}
+    for name, _, _, _ in get_interfaces():
+        ib_mac = get_ib_interface_hwaddr(name, False)
+        if ib_mac:
+            if ib_mac in ret:
+                raise RuntimeError(
+                    "duplicate mac found! both '%s' and '%s' have mac '%s'" %
+                    (name, ret[ib_mac], ib_mac))
+            ret[name] = ib_mac
+    return ret
+
+
 class EphemeralIPv4Network(object):
     """Context manager which sets up temporary static network configuration.
 
diff --git a/cloudinit/net/network_state.py b/cloudinit/net/network_state.py
index 72c803eb..f76e508a 100644
--- a/cloudinit/net/network_state.py
+++ b/cloudinit/net/network_state.py
@@ -483,6 +483,10 @@ class NetworkStateInterpreter(object):
 
         interfaces.update({iface['name']: iface})
 
+    @ensure_command_keys(['name'])
+    def handle_infiniband(self, command):
+        self.handle_physical(command)
+
     @ensure_command_keys(['address'])
     def handle_nameserver(self, command):
         dns = self._network_state.get('dns')
diff --git a/cloudinit/net/sysconfig.py b/cloudinit/net/sysconfig.py
index 66e970e0..9c16d3a7 100644
--- a/cloudinit/net/sysconfig.py
+++ b/cloudinit/net/sysconfig.py
@@ -174,6 +174,7 @@ class NetInterface(ConfigMap):
         'ethernet': 'Ethernet',
         'bond': 'Bond',
         'bridge': 'Bridge',
+        'infiniband': 'InfiniBand',
     }
 
     def __init__(self, iface_name, base_sysconf_dir, templates,
@@ -569,6 +570,18 @@ class Renderer(renderer.Renderer):
             cls._render_subnet_routes(iface_cfg, route_cfg, iface_subnets)
 
     @classmethod
+    def _render_ib_interfaces(cls, network_state, iface_contents):
+        ib_filter = renderer.filter_by_type('infiniband')
+        for iface in network_state.iter_interfaces(ib_filter):
+            iface_name = iface['name']
+            iface_cfg = iface_contents[iface_name]
+            iface_cfg.kind = 'infiniband'
+            iface_subnets = iface.get("subnets", [])
+            route_cfg = iface_cfg.routes
+            cls._render_subnets(iface_cfg, iface_subnets)
+            cls._render_subnet_routes(iface_cfg, route_cfg, iface_subnets)
+
+    @classmethod
     def _render_sysconfig(cls, base_sysconf_dir, network_state,
                           templates=None):
         '''Given state, return /etc/sysconfig files + contents'''
@@ -586,6 +599,7 @@ class Renderer(renderer.Renderer):
         cls._render_bond_interfaces(network_state, iface_contents)
         cls._render_vlan_interfaces(network_state, iface_contents)
         cls._render_bridge_interfaces(network_state, iface_contents)
+        cls._render_ib_interfaces(network_state, iface_contents)
         contents = {}
         for iface_name, iface_cfg in iface_contents.items():
             if iface_cfg or iface_cfg.children: