bond: T8023: validate member interface min/max MTU

It is impossible to set the bond interface MTU to be larger or lower then the
limits of the underlaying interface MTU. Add proper commit validation and
smoketest.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces_bonding.py b/src/conf_mode/interfaces_bonding.py
index 68c2885bc..f844d0a21 100755
--- a/src/conf_mode/interfaces_bonding.py
+++ b/src/conf_mode/interfaces_bonding.py
@@ -248,6 +248,17 @@ def verify(bond):
                         continue
                     raise ConfigError(error_msg + f'it has a "{option_path.replace(".", " ")}" assigned!')
 
+            if mtu := bond.get('mtu'):
+                mtu = int(mtu)
+                max_mtu = int(EthernetIf(interface).get_max_mtu())
+                min_mtu = int(EthernetIf(interface).get_min_mtu())
+                if mtu > max_mtu:
+                    raise ConfigError('Configured MTU is greater then member '\
+                                      f'interface "{interface}" maximum of {max_mtu}!')
+                if mtu < min_mtu:
+                    raise ConfigError('Configured MTU is less then member '\
+                                      f'interface "{interface}" minimum of {min_mtu}!')
+
     if 'primary' in bond:
         if bond['primary'] not in bond['member']['interface']:
             raise ConfigError(f'Primary interface of bond "{bond_name}" must be a member interface')