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RDMA/cxgb4: CQ size must be IQ size - 2

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We need 1 extra entry for the status page and 1 to always have 1 free
entry to detect when the queue is full.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Steve Wise 2010-05-20 16:57:38 -05:00 committed by Roland Dreier
parent 1c01c53883
commit 895cf5f3d6
1 changed files with 4 additions and 1 deletions
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5
drivers/infiniband/hw/cxgb4/cq.c
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@ -780,6 +780,9 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
/* account for the status page. */ /* account for the status page. */
entries++; entries++;
/* IQ needs one extra entry to differentiate full vs empty. */
entries++;
/* /*
* entries must be multiple of 16 for HW. * entries must be multiple of 16 for HW.
*/ */
@ -801,7 +804,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
chp->rhp = rhp; chp->rhp = rhp;
chp->cq.size--; /* status page */ chp->cq.size--; /* status page */
chp->ibcq.cqe = chp->cq.size; chp->ibcq.cqe = chp->cq.size - 1;
spin_lock_init(&chp->lock); spin_lock_init(&chp->lock);
atomic_set(&chp->refcnt, 1); atomic_set(&chp->refcnt, 1);
init_waitqueue_head(&chp->wait); init_waitqueue_head(&chp->wait);