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IB/{rdmavt, qib, hfi1}: Convert to new completion API

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Convert all completions to use the new completion routine that
fixes a race between post send and completion where fields from
a SWQE can be read after SWQE has been freed.

This patch also addresses issues reported in
https://marc.info/?l=linux-kernel&m=155656897409107&w=2.

The reserved operation path has no need for any barrier.

The barrier for the other path is addressed by the
smp_load_acquire() barrier.

Cc: Andrea Parri <andrea.parri@amarulasolutions.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Mike Marciniszyn
2019-06-13 08:30:52 -04:00
zatwierdzone przez Doug Ledford
rodzic f56044d686
commit 4a9ceb7dba
4 zmienionych plików z 17 dodań i 102 usunięć
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31
drivers/infiniband/sw/rdmavt/qp.c
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@@ -1853,10 +1853,9 @@ static inline int rvt_qp_is_avail(
/* see rvt_qp_wqe_unreserve() */
smp_mb__before_atomic();
reserved_used = atomic_read(&qp->s_reserved_used);
if (unlikely(reserved_op)) {
/* see rvt_qp_wqe_unreserve() */
smp_mb__before_atomic();
reserved_used = atomic_read(&qp->s_reserved_used);
if (reserved_used >= rdi->dparms.reserved_operations)
return -ENOMEM;
return 0;
@@ -1864,14 +1863,13 @@ static inline int rvt_qp_is_avail(
/* non-reserved operations */
if (likely(qp->s_avail))
return 0;
slast = READ_ONCE(qp->s_last);
/* See rvt_qp_complete_swqe() */
slast = smp_load_acquire(&qp->s_last);
if (qp->s_head >= slast)
avail = qp->s_size - (qp->s_head - slast);
else
avail = slast - qp->s_head;
/* see rvt_qp_wqe_unreserve() */
smp_mb__before_atomic();
reserved_used = atomic_read(&qp->s_reserved_used);
avail = avail - 1 -
(rdi->dparms.reserved_operations - reserved_used);
@@ -2664,27 +2662,16 @@ void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
enum ib_wc_status status)
{
u32 old_last, last;
struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device);
struct rvt_dev_info *rdi;
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND))
return;
rdi = ib_to_rvt(qp->ibqp.device);
last = qp->s_last;
old_last = last;
trace_rvt_qp_send_completion(qp, wqe, last);
if (++last >= qp->s_size)
last = 0;
trace_rvt_qp_send_completion(qp, wqe, last);
qp->s_last = last;
/* See post_send() */
barrier();
rvt_put_qp_swqe(qp, wqe);
rvt_qp_swqe_complete(qp,
wqe,
rdi->wc_opcode[wqe->wr.opcode],
status);
old_last = qp->s_last;
trace_rvt_qp_send_completion(qp, wqe, old_last);
last = rvt_qp_complete_swqe(qp, wqe, rdi->wc_opcode[wqe->wr.opcode],
status);
if (qp->s_acked == old_last)
qp->s_acked = last;
if (qp->s_cur == old_last)