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authorSteve Wise <swise@opengridcomputing.com>2010-05-20 16:57:38 -0500
committerRoland Dreier <rolandd@cisco.com>2010-05-24 21:08:00 -0700
commit895cf5f3d6cb72825919a39ae48a41476a821e65 (patch)
tree538a9670e1146474f0e3ceb32c2fec415be05e22 /drivers/infiniband/hw
parent1c01c5388306a4c2245b71da0cba22d521e897ae (diff)
downloadlinux-linaro-895cf5f3d6cb72825919a39ae48a41476a821e65.tar.gz
RDMA/cxgb4: CQ size must be IQ size - 2
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>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r--drivers/infiniband/hw/cxgb4/cq.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index fb1aafcc294..46ac00f728f 100644
--- a/drivers/infiniband/hw/cxgb4/cq.c
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -780,6 +780,9 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
/* account for the status page. */
entries++;
+ /* IQ needs one extra entry to differentiate full vs empty. */
+ entries++;
+
/*
* 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->cq.size--; /* status page */
- chp->ibcq.cqe = chp->cq.size;
+ chp->ibcq.cqe = chp->cq.size - 1;
spin_lock_init(&chp->lock);
atomic_set(&chp->refcnt, 1);
init_waitqueue_head(&chp->wait);