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IB/qib: Unnecessary delayed completions on RC connection 

Currently on receipt of a response message (ACKs, RDMA Response,
Atomic Responses etc.) if the SDMA completion counter is not advanced
the driver delays the completion of the WQE.  In most cases this is
overly pessimistic as the response (ACK) to a previously transmitted
send implies that the send is complete.  Ensure that SDMA queue is
progressed appropriately before determining if a send has delayed
completions.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Mike Marciniszyn 2011-01-10 17:42:22 -08:00 committed by Roland Dreier
parent 994bcd28a3
commit dd04e43d46
1 changed files with 24 additions and 0 deletions
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24
drivers/infiniband/hw/qib/qib_rc.c
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@ -1407,6 +1407,7 @@ static void qib_rc_rcv_resp(struct qib_ibport *ibp,
struct qib_ctxtdata *rcd)
{
struct qib_swqe *wqe;
struct qib_pportdata *ppd = ppd_from_ibp(ibp);
enum ib_wc_status status;
unsigned long flags;
int diff;
@ -1414,6 +1415,29 @@ static void qib_rc_rcv_resp(struct qib_ibport *ibp,
u32 aeth;
u64 val;
if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) {
/*
* If ACK'd PSN on SDMA busy list try to make progress to
* reclaim SDMA credits.
*/
if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) &&
(qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) {
/*
* If send tasklet not running attempt to progress
* SDMA queue.
*/
if (!(qp->s_flags & QIB_S_BUSY)) {
/* Acquire SDMA Lock */
spin_lock_irqsave(&ppd->sdma_lock, flags);
/* Invoke sdma make progress */
qib_sdma_make_progress(ppd);
/* Release SDMA Lock */
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
}
}
}
spin_lock_irqsave(&qp->s_lock, flags);
/* Ignore invalid responses. */