[systemd-devel] TCPSegmentationOffload seem to be ignored in link-file

[basti]

Hello,
I move my network config from if-up to systemd and create a link file as 
follows:

root at s920:~# cat /etc/systemd/network/10-enp1s0f1.link
[Match]
MACAddress=00:19:99:b7:e0:99

[Link]
GenericSegmentationOffload=false
GenericReceiveOffload=false
TCPSegmentationOffload=false
root at s920:~#

The file seems to be used:

root at s920:~# networkctl status enp1s0f1
● 3: enp1s0f1 

                      Link File: /etc/systemd/network/10-enp1s0f1.link
                   Network File: /etc/systemd/network/enp1s0f1.network
                          State: routable (configured)
                   Online state: online 

                           Type: ether
                           Path: pci-0000:01:00.1
                         Driver: igb
                         Vendor: Intel Corporation
                          Model: 82580 Gigabit Network Connection
               Hardware Address: 00:19:99:b7:e0:99 (Fujitsu Technology 
Solutions GmbH)
                            MTU: 1500 (min: 68, max: 9216)
                          QDisc: mq
   IPv6 Address Generation Mode: eui64
       Number of Queues (Tx/Rx): 8/8
               Auto negotiation: yes
                          Speed: 1Gbps
                         Duplex: full
                           Port: tp
                        Address: 192.168.1.10
                                 fe80::219:99ff:feb7:e099
              Activation Policy: up
            Required For Online: yes
              DHCP6 Client DUID: DUID-EN/Vendor:0000ab117b7b45fb726da9a50000

Aug 07 21:37:52 s920 systemd-networkd[831]: enp1s0f1: Configuring with 
/etc/systemd/network/enp1s0f1.network.
Aug 07 21:37:52 s920 systemd-networkd[831]: enp1s0f1: Link UP
Aug 07 21:37:55 s920 systemd-networkd[831]: enp1s0f1: Gained carrier
Aug 07 21:37:56 s920 systemd-networkd[831]: enp1s0f1: Gained IPv6LL
root at s920:~#


root at s920:~# ethtool -k enp1s0f1 | grep offload
tcp-segmentation-offload: on
generic-segmentation-offload: off
generic-receive-offload: off
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
esp-hw-offload: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
rx-udp_tunnel-port-offload: off [fixed]
tls-hw-tx-offload: off [fixed]
tls-hw-rx-offload: off [fixed]
macsec-hw-offload: off [fixed]
hsr-tag-ins-offload: off [fixed]
hsr-tag-rm-offload: off [fixed]
hsr-fwd-offload: off [fixed]
hsr-dup-offload: off [fixed]
root at s920:~#

But tcp-segmentation-offload is still on or re-enabled by someone?
any ideas?

systemd is 252.12-1 (debian12)

Best regards