The ixgbe(4) shows two options of media: auto and 10Gbase-T, but it is not possible to set the 10Gbase-T.

Without patch:
BSDBuild# ifconfig -m ix0 | grep media
media: Ethernet autoselect (1000baseT <full-duplex>)
supported media:

		media autoselect
		media 10Gbase-T

BSDBuild# ifconfig ix0 media 10Gbase-T
ifconfig: SIOCSIFMEDIA (media): Invalid argument

With patch:
BSDBuild# ifconfig -m ix0
ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=8407bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO>
capabilities=8507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO>
ether 00:08:9b:d4:6b:6e
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseSX <full-duplex>)
status: active
supported media:

		media autoselect
		media 10Gbase-T

BSDBuild# ifconfig ix0 media 10Gbase-T
BSDBuild# ifconfig ix0
ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=8407bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO>
ether 00:08:9b:d4:6b:6e
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet 10Gbase-T (1000baseSX <full-duplex>)
status: active