using ConnectX card as Ethernet (mlxen)

I have a machine running "FreeBSD 10.0-CURRENT #0 r240887" amd64 with =
two ConnectX (InfiniBand) cards. Relevant bits of dmesg and pciconf -lv =
below. The cards are connected directly to a 10GB Ethernet switch so I =
need to run them in "eth" mode rather than "ib". Unfortunately they come =
up in "ib" mode and I don't know how to change it.

The same hardware works fine under CentOS 6.3, though I need to manually =
set the cards to 'eth' there as well (which I do using a =
'connectx_port_config script from Mellanox that twiddles the mlx4_port1 =
entries under /sys (sysfs). Under FreeBSD I see these sysctls but I =
can't set them to 'eth' either via /boot/loader.conf or by sysctl after =
boot, with or without mlxen and/or mlx4ib loaded:
sys.device.mlx4_core0.mlx4_port1: ib
sys.device.mlx4_core1.mlx4_port1: ib

Assuming mlxen is actually supported, how do I configure the card so it =
will attach?

mlx4_core0: <mlx4_core> mem 0xdfa00000-0xdfafffff,0xdd800000-0xddffffff =
irq 32 at device 0.0 on pci4
mlx4_core: Mellanox ConnectX core driver v1.0-ofed1.5.2 (August 4, 2010)
mlx4_core: Initializing mlx4_core
mlx4_en: Mellanox ConnectX HCA Ethernet driver v1.5.2 (July 2010)
mlx4_en mlx4_core0: UDP RSS is not supported on this device.
mlx4_core1: <mlx4_core> mem 0xdf900000-0xdf9fffff,0xdd000000-0xdd7fffff =
irq 42 at device 0.0 on pci7
mlx4_core: Initializing mlx4_core

mlx4_core0@pci0:4:0:0:	class=3D0x0c0600 card=3D0x002215b3 =
chip=3D0x673c15b3 rev=3D0xb0 hdr=3D0x00
    vendor     =3D 'Mellanox Technologies'
    device     =3D 'MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / =
10GigE]'
    class      =3D serial bus
mlx4_core1@pci0:7:0:0:	class=3D0x028000 card=3D0x001715b3 =
chip=3D0x100315b3 rev=3D0x00 hdr=3D0x00
    vendor     =3D 'Mellanox Technologies'
    device     =3D 'MT27500 Family [ConnectX-3]'
    class      =3D network

Thanks,

JN

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