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IB/{rdmavt, hfi1, qib}: Remove AH refcount for UD QPs

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Historically rdmavt destroy_ah() has returned an -EBUSY when the AH has a
non-zero reference count.  IBTA 11.2.2 notes no such return value or error
case:

	Output Modifiers:
	- Verb results:
	- Operation completed successfully.
	- Invalid HCA handle.
	- Invalid address handle.

ULPs never test for this error and this will leak memory.

The reference count exists to allow for driver independent progress
mechanisms to process UD SWQEs in parallel with post sends.  The SWQE will
hold a reference count until the UD SWQE completes and then drops the
reference.

Fix by removing need to reference count the AH.  Add a UD specific
allocation to each SWQE entry to cache the necessary information for
independent progress.  Copy the information during the post send
processing.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Michael J. Ruhl
2019-06-28 14:22:04 -04:00
committed by Jason Gunthorpe
parent fe2ac04712
commit d310c4bf8a
8 changed files with 106 additions and 42 deletions
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4
drivers/infiniband/hw/qib/qib_qp.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2012 - 2017 Intel Corporation. All rights reserved.
* Copyright (c) 2012 - 2019 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 QLogic Corporation. * All rights reserved.
* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
*
@@ -398,7 +398,7 @@ int qib_check_send_wqe(struct rvt_qp *qp,
case IB_QPT_SMI:
case IB_QPT_GSI:
case IB_QPT_UD:
ah = ibah_to_rvtah(wqe->ud_wr.ah);
ah = ibah_to_rvtah(wqe->ud_wr.wr.ah);
if (wqe->length > (1 << ah->log_pmtu))
return -EINVAL;
/* progress hint */