In newer firmware that supports multithreaded MCDI processing, longer running commands may be run ina background thread. Add support for drivers to query the appropriate timeout for each MCDI request. Submitted by: Andy Moreton <amoreton at solarflare.com> Reviewed by: gnn Sponsored by: Solarflare Communications, Inc. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D8968