LU-14733 o2iblnd: Avoid double posting invalidate

LU-14733 o2iblnd: Avoid double posting invalidate

When the kib_tx is provisioned during kiblnd_fmr_pool_map(), spare
WRs in the kib_fast_reg_descriptor are setup and the mapping of
pages is given to the mr.

kiblnd_post_tx_locked() then posts the spare WRs from the
kib_fast_reg_descriptor.

	if (rc == 0)
		return 0;

The code returns and the kib_fast_reg_descriptor is still contains
the spare WRs.   The next time the kib_tx is used, the
now obsolete WRs will be inadvertently posted.   For rdmavt, the
obsolete invalidate will cause an -EINVAL to be returned from
the post send.

Fix by adding a state variable frd_posted to the kib_fast_reg_descriptor.
The variable is set to false in kiblnd_fmr_pool_unmap().
kiblnd_post_tx_locked() is adjusted to avoid prepending the
kib_fast_reg_descriptor WRs when frd_posted is true.   After
the post succeeds, the frd_posted is set to true.

Lustre-change: https://review.whamcloud.com/44190
Lustre-commit: 5930576791e864529e6ef9b46f3e09cc4b635fc2
Test-Parameters: trivial

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Change-Id: I426dd05e635392e75d1aa48808782a229e83ce5f
Signed-off-by: Gian-Carlo DeFazio <defazio1@llnl.gov>
Reviewed-on: https://review.whamcloud.com/44296
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>