MACSEC and if_msk.c

[Richard PALO <richard.palo%free.fr@localhost>]

Having [unfortunately] reserved a HP probook 4515s for NetBSD, I 
immediately needed to attack a solution for the Marvel Yukon-II Extreme 
88E8072 NIC.
I'm coming across an issue where I guess I could use a crash course 
NetBSD NIC driver design document, in particular around MACSEC, as 
setting the following:
> if (sc->sk_type == SK_YUKON_EX)
>         SK_IF_WRITE_4(sc_if, 0, SK_GMAC_CTRL, SK_GMAC_BYP_RETX_ON);
is okay but adding what FreeBSD does crashes the system, that is
>  '| SK_GMAC_BYP_MACSECRX_ON | SK_GMAC_BYP_MACSECTX_ON'
Elsewhere, I can seemingly set the following:
> SK_IF_WRITE_4(sc_if,0,SK_RXMF1_CTRL_TEST,SK_RFCTL_RX_MACSEC_FLUSH_OFF);
That is, I'm not yet extremely familiar with the different players in 
this driver tree, msk, sk, macphy (here, 88E1149), etc...
Also, I understand there is no checksum offloading, is this being worked 
on by someone? Is there a NetBSD maintainer for this code that I could 
solicit some specific hints?
So far I'm able to configure and bring up the interface but need to get 
the bits flowing correctly after a completing all the necessary 
initialisation steps.
Can anyone provide any pointers (or war stories) ?

cheers