Support provider response data in reg_mr command

Allow kernel register MR command to pass back driver-specific data to
the userspace driver.  The code is there to do this in the kernel, but
not in the libibverbs cmd interface.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2 files changed