diff options
| author | Steve Wise <swise@opengridcomputing.com> | 2010-05-20 16:57:38 -0500 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2010-05-24 21:08:00 -0700 |
| commit | 895cf5f3d6cb72825919a39ae48a41476a821e65 (patch) | |
| tree | 538a9670e1146474f0e3ceb32c2fec415be05e22 | |
| parent | 1c01c5388306a4c2245b71da0cba22d521e897ae (diff) | |
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>
| -rw-r--r-- | drivers/infiniband/hw/cxgb4/cq.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c index fb1aafcc294f..46ac00f728f3 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); |