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_classes.h | |
| 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_classes.h')
| -rw-r--r-- | drivers/infiniband/hw/ehca/ehca_classes.h | 7 |
1 files changed, 7 insertions, 0 deletions
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; |