12.2-RC1: RTL8251/8153 1000BASE-T seemingly stuck at 100Mbps

[sreehari]

I have a USB C hub that supports gigabit ethernet under any other OS,
but under FreeBSD it seems to detect it properly, but I never get
speeds exceeding 100Mbps transfer rate on the whole thing. Is this a
known issue? Also is there any way to check what the perceived link
speed is? I've attached dmesg.boot if that helps.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dmesg.boot
Type: application/octet-stream
Size: 10787 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20201006/3ce5fb8d/attachment.obj>