tree e8660a877ac4dc5e564596a6aef98c91a0419af2
parent 63a71ba6178a1989dcea1c5f595b6c6a3d48d6d9
author Pramod Kumar <pramod@chelsio.com> 1416584195 -0600
committer Roland Dreier <roland@purestorage.com> 1418695846 -0800

RDMA/cxgb4: Configure 0B MRs to match HW implementation

0B MRs need some tweaks to work correctly with HW. When writing the
TPTE, if the MR length is zero we now:

1) turn off all permissions
2) set the length to -1

While functionality/capabilities of the MR are the same with these
changes, it resolves a dapltest 0B RDMA Read test failure.  Based on
original work by Steve Wise <swise@opengridcomputing.com>.

Signed-off-by: Pramod Kumar <pramod@chelsio.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>