I've tried to introduce a 10GbE interface to my FreeBSD 12.0 host:
At first, I've installed QLogic NetXtreme II BCM57840, but this one did not worked well. For example, this done not link up at boot time, automatically. I should do "ifconfig bxe0 down; ifconfig bxe0 up" in the rc file.
So, I've purchased new one from amazcon.co.jp:
StarTech.com 1ポート10ギガSFP+増設PCIe専用LANカード 10GBase-SR対応NIC Intelチップ搭載 マルチモード対応トランシーバモジュール付属 PEX10000SRI
(StarTech.com PEX10000SRI/1port with SFP+ module)
I've booted up..., then I've got it! This interface works well.
$ pciconf -l -v
ix0@pci0:1:0:0: class=0x020000 card=0x000a8086 chip=0x15578086 rev=0x01 hdr=0x00
vendor = 'Intel Corporation'
device = '82599 10 Gigabit Network Connection'
class = network
subclass = ethernet