From 1c721940ddd6496508f1f2fde5167b1c898b419b Mon Sep 17 00:00:00 2001 From: Stefan Roscher Date: Fri, 5 Dec 2008 11:25:38 -0800 Subject: 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 Signed-off-by: Roland Dreier --- drivers/infiniband/hw/ehca/ehca_classes.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/infiniband/hw/ehca/ehca_classes.h') diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h index 7fc35cf0cddf..c825142a2fb7 100644 --- a/drivers/infiniband/hw/ehca/ehca_classes.h +++ b/drivers/infiniband/hw/ehca/ehca_classes.h @@ -175,6 +175,13 @@ struct ehca_queue_map { unsigned int next_wqe_idx; /* Idx to first wqe to be flushed */ }; +/* function to calculate the next index for the qmap */ +static inline unsigned int next_index(unsigned int cur_index, unsigned int limit) +{ + unsigned int temp = cur_index + 1; + return (temp == limit) ? 0 : temp; +} + struct ehca_qp { union { struct ib_qp ib_qp; -- cgit