Q on how to test "gcm-aes-xpn-128"

Hi macsec specialist,

One question on macsec

I want to test macsec with "gcm-aes-xpn-128", but it seems that iproute2 does not support it yet.
Is there any tool available to set SSCI and Salt from user space ?
In other words, how gcm-aes-xpn-128 is tested ?

Thanks.

John