functionality first appeared in FreeBSD. Submitted by: Gordon Bergling gbergling_gmail.com Approved by: bcr Differential Revision: https://reviews.freebsd.org/D24677
MFC after: 1 week
Reviewed by: bjk, jilles Discussed with: emaste, wblock Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D8016