diff options
| author | Stefan Roscher <ossrosch@linux.vnet.ibm.com> | 2008-12-05 11:25:38 -0800 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-12-05 11:25:38 -0800 |
| commit | 1c721940ddd6496508f1f2fde5167b1c898b419b (patch) | |
| tree | d0ea3b596a617a6bdacbe0a23946808be80ba732 /drivers/infiniband/hw/ehca/ehca_qp.c | |
| parent | 75c21ae9aa75b0452318d05f737ea838672137f5 (diff) | |
IB/ehca: Replace modulus operations in flush error completion path
With the latest flush error completion patch we introduced modulus
operation to calculate the next index within a qmap. Based on
comments from other mailing lists we decided to optimize this
operation by using an addition and an if-statement instead of modulus,
even though this is on the error path.
Signed-off-by: Stefan Roscher <stefan.roscher@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ehca/ehca_qp.c')
| -rw-r--r-- | drivers/infiniband/hw/ehca/ehca_qp.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c index cadbf0cdd91..f161cf173db 100644 --- a/drivers/infiniband/hw/ehca/ehca_qp.c +++ b/drivers/infiniband/hw/ehca/ehca_qp.c @@ -1138,14 +1138,14 @@ static int calc_left_cqes(u64 wqe_p, struct ipz_queue *ipz_queue, return -EFAULT; } - tail_idx = (qmap->tail + 1) % qmap->entries; + tail_idx = next_index(qmap->tail, qmap->entries); wqe_idx = q_ofs / ipz_queue->qe_size; /* check all processed wqes, whether a cqe is requested or not */ while (tail_idx != wqe_idx) { if (qmap->map[tail_idx].cqe_req) qmap->left_to_poll++; - tail_idx = (tail_idx + 1) % qmap->entries; + tail_idx = next_index(tail_idx, qmap->entries); } /* save index in queue, where we have to start flushing */ qmap->next_wqe_idx = wqe_idx; @@ -1195,14 +1195,14 @@ static int check_for_left_cqes(struct ehca_qp *my_qp, struct ehca_shca *shca) } else { spin_lock_irqsave(&my_qp->send_cq->spinlock, flags); my_qp->sq_map.left_to_poll = 0; - my_qp->sq_map.next_wqe_idx = (my_qp->sq_map.tail + 1) % - my_qp->sq_map.entries; + my_qp->sq_map.next_wqe_idx = next_index(my_qp->sq_map.tail, + my_qp->sq_map.entries); spin_unlock_irqrestore(&my_qp->send_cq->spinlock, flags); spin_lock_irqsave(&my_qp->recv_cq->spinlock, flags); my_qp->rq_map.left_to_poll = 0; - my_qp->rq_map.next_wqe_idx = (my_qp->rq_map.tail + 1) % - my_qp->rq_map.entries; + my_qp->rq_map.next_wqe_idx = next_index(my_qp->rq_map.tail, + my_qp->rq_map.entries); spin_unlock_irqrestore(&my_qp->recv_cq->spinlock, flags); } |