diff options
| author | Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-09-23 21:16:49 +0400 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-10-21 20:38:56 +0400 |
| commit | d0f2faf72d51dacf5c5e8dec7dca22d0395896e2 (patch) | |
| tree | 9cdae5f02f9d17dac30c9a140123dc912d897278 /drivers/infiniband/hw/qib/qib_qp.c | |
| parent | af061a644a0e4d4778fe6cd2246479c1962e153b (diff) | |
| download | linux-d0f2faf72d51dacf5c5e8dec7dca22d0395896e2.tar.xz | |
IB/qib: Precompute timeout jiffies to optimize latency
A new field is added to qib_qp called timeout_jiffies. It is
initialized upon create and modify.
The field is now used instead of a computation based on qp->timeout.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_qp.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_qp.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_qp.c b/drivers/infiniband/hw/qib/qib_qp.c index 500981bce9c0..7e7e16fbee99 100644 --- a/drivers/infiniband/hw/qib/qib_qp.c +++ b/drivers/infiniband/hw/qib/qib_qp.c @@ -801,8 +801,12 @@ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, if (attr_mask & IB_QP_MIN_RNR_TIMER) qp->r_min_rnr_timer = attr->min_rnr_timer; - if (attr_mask & IB_QP_TIMEOUT) + if (attr_mask & IB_QP_TIMEOUT) { qp->timeout = attr->timeout; + qp->timeout_jiffies = + usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / + 1000UL); + } if (attr_mask & IB_QP_QKEY) qp->qkey = attr->qkey; @@ -1034,6 +1038,9 @@ struct ib_qp *qib_create_qp(struct ib_pd *ibpd, goto bail_swq; } RCU_INIT_POINTER(qp->next, NULL); + qp->timeout_jiffies = + usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / + 1000UL); if (init_attr->srq) sz = 0; else { |