T6716: don't automatically set ethernet offload

Remove the lines of code that checked if the kernel had offloading
enabled and was then forcing the config to set it to "on." The
behavior now mirrors the config and offloading will only be enabled
if the config is explicitly set to enabled.

Note: the code is still present to disable the offloading, in the
config, if the kernel doesn't support it.

Note(2): Allow the previous behavior where the offload settings get set,
based on the Kernel, if the boot is a live boot.

Author: Dave Vogel

src/activation-scripts/20-ethernet_offload.py

@@ -17,9 +17,12 @@
 #        CLI. See https://vyos.dev/T3619#102254 for all the details.
 # T3787: Remove deprecated UDP fragmentation offloading option
 # T6006: add to activation-scripts: migration-scripts/interfaces/20-to-21
+# T6716: Honor the configured offload settings and don't automatically add
+#        them to the config if the kernel has them set (unless its a live boot)
 
 from vyos.ethtool import Ethtool
 from vyos.configtree import ConfigTree
+from vyos.system.image import is_live_boot
 
 def activate(config: ConfigTree):
     base = ['interfaces', 'ethernet']
@@ -36,7 +39,7 @@ def activate(config: ConfigTree):
         enabled, fixed = eth.get_generic_receive_offload()
         if configured and fixed:
             config.delete(base + [ifname, 'offload', 'gro'])
-        elif enabled and not fixed:
+        elif is_live_boot() and enabled and not fixed:
             config.set(base + [ifname, 'offload', 'gro'])
 
         # If GSO is enabled by the Kernel - we reflect this on the CLI. If GSO is
@@ -45,7 +48,7 @@ def activate(config: ConfigTree):
         enabled, fixed = eth.get_generic_segmentation_offload()
         if configured and fixed:
             config.delete(base + [ifname, 'offload', 'gso'])
-        elif enabled and not fixed:
+        elif is_live_boot() and enabled and not fixed:
             config.set(base + [ifname, 'offload', 'gso'])
 
         # If LRO is enabled by the Kernel - we reflect this on the CLI. If LRO is
@@ -54,7 +57,7 @@ def activate(config: ConfigTree):
         enabled, fixed = eth.get_large_receive_offload()
         if configured and fixed:
             config.delete(base + [ifname, 'offload', 'lro'])
-        elif enabled and not fixed:
+        elif is_live_boot() and enabled and not fixed:
             config.set(base + [ifname, 'offload', 'lro'])
 
         # If SG is enabled by the Kernel - we reflect this on the CLI. If SG is
@@ -63,7 +66,7 @@ def activate(config: ConfigTree):
         enabled, fixed = eth.get_scatter_gather()
         if configured and fixed:
             config.delete(base + [ifname, 'offload', 'sg'])
-        elif enabled and not fixed:
+        elif is_live_boot() and enabled and not fixed:
             config.set(base + [ifname, 'offload', 'sg'])
 
         # If TSO is enabled by the Kernel - we reflect this on the CLI. If TSO is
@@ -72,7 +75,7 @@ def activate(config: ConfigTree):
         enabled, fixed = eth.get_tcp_segmentation_offload()
         if configured and fixed:
             config.delete(base + [ifname, 'offload', 'tso'])
-        elif enabled and not fixed:
+        elif is_live_boot() and enabled and not fixed:
             config.set(base + [ifname, 'offload', 'tso'])
 
         # Remove deprecated UDP fragmentation offloading option