diff options
| author | Kaike Wan <kaike.wan@intel.com> | 2019-01-23 21:52:19 -0800 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2019-02-05 18:07:44 -0500 |
| commit | 34025fb0c4c9d6b2e294f8f8f0a82491a13c83a2 (patch) | |
| tree | d74d2b91aa5cb1c8509c22bceb51badf5f17bcfe /drivers/infiniband/hw/hfi1/qp.c | |
| parent | a05c9bdcfd16cec3a004cca339ab45de4cdf4799 (diff) | |
IB/hfi1: Prioritize the sending of ACK packets
ACK packets are generally associated with request completion and resource
release and therefore should be sent first. This patch optimizes the
send engine by using the following policies:
(1) QPs with RVT_S_ACK_PENDING bit set in qp->s_flags or qpriv->s_flags
should have their priority incremented;
(2) QPs with ACK or TID-ACK packet queued should have their priority
incremented;
(3) When a QP is queued to the wait list due to resource constraints, it
will be queued to the head if it has ACK packet to send;
(4) When selecting qps to run from the wait list, the one with the highest
priority and starve_cnt will be selected; each priority will be equivalent
to a fixed number of starve_cnt (16).
Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/hw/hfi1/qp.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/qp.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c index cfd598e4b303..d8f7add935df 100644 --- a/drivers/infiniband/hw/hfi1/qp.c +++ b/drivers/infiniband/hw/hfi1/qp.c @@ -518,6 +518,7 @@ static int iowait_sleep( ibp->rvp.n_dmawait++; qp->s_flags |= RVT_S_WAIT_DMA_DESC; + iowait_get_priority(&priv->s_iowait); iowait_queue(pkts_sent, &priv->s_iowait, &sde->dmawait); priv->s_iowait.lock = &sde->waitlock; @@ -567,6 +568,17 @@ static void iowait_sdma_drained(struct iowait *wait) spin_unlock_irqrestore(&qp->s_lock, flags); } +static void hfi1_init_priority(struct iowait *w) +{ + struct rvt_qp *qp = iowait_to_qp(w); + struct hfi1_qp_priv *priv = qp->priv; + + if (qp->s_flags & RVT_S_ACK_PENDING) + w->priority++; + if (priv->s_flags & RVT_S_ACK_PENDING) + w->priority++; +} + /** * qp_to_sdma_engine - map a qp to a send engine * @qp: the QP @@ -727,7 +739,8 @@ void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp) _hfi1_do_tid_send, iowait_sleep, iowait_wakeup, - iowait_sdma_drained); + iowait_sdma_drained, + hfi1_init_priority); return priv; } |