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staging/rdma/hfi1: Allow a fair scheduling of QPs 

This patch fixes the fairness issues in QP scheduling
- the timeout for cond_resched is changed to a ratio of
qp->timeout_jiffies
- workqueue_congested is used to determine if qp needs to
reschedule itself

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Vennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Vennila Megavannan 2016-02-03 14:34:23 -08:00 committed by Doug Ledford
parent f1bf296340
commit 23cd4716b7
1 changed files with 38 additions and 14 deletions
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52
drivers/staging/rdma/hfi1/ruc.c
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@ -822,29 +822,42 @@ void _hfi1_do_send(struct work_struct *work)
void hfi1_do_send(struct rvt_qp *qp)
{
struct hfi1_pkt_state ps;
struct hfi1_qp_priv *priv = qp->priv;
int (*make_req)(struct rvt_qp *qp);
unsigned long flags;
unsigned long timeout;
unsigned long timeout_int;
int cpu;
ps.dev = to_idev(qp->ibqp.device);
ps.ibp = to_iport(qp->ibqp.device, qp->port_num);
ps.ppd = ppd_from_ibp(ps.ibp);
if ((qp->ibqp.qp_type == IB_QPT_RC ||
qp->ibqp.qp_type == IB_QPT_UC) &&
!loopback &&
(qp->remote_ah_attr.dlid & ~((1 << ps.ppd->lmc) - 1)) ==
ps.ppd->lid) {
ruc_loopback(qp);
return;
}
if (qp->ibqp.qp_type == IB_QPT_RC)
switch (qp->ibqp.qp_type) {
case IB_QPT_RC:
if (!loopback && ((qp->remote_ah_attr.dlid & ~((1 << ps.ppd->lmc
) - 1)) ==
ps.ppd->lid)) {
ruc_loopback(qp);
return;
}
make_req = hfi1_make_rc_req;
else if (qp->ibqp.qp_type == IB_QPT_UC)
timeout_int = (qp->timeout_jiffies);
break;
case IB_QPT_UC:
if (!loopback && ((qp->remote_ah_attr.dlid & ~((1 << ps.ppd->lmc
) - 1)) ==
ps.ppd->lid)) {
ruc_loopback(qp);
return;
}
make_req = hfi1_make_uc_req;
else
timeout_int = SEND_RESCHED_TIMEOUT;
break;
default:
make_req = hfi1_make_ud_req;
timeout_int = SEND_RESCHED_TIMEOUT;
}
spin_lock_irqsave(&qp->s_lock, flags);
@ -858,7 +871,9 @@ void hfi1_do_send(struct rvt_qp *qp)
spin_unlock_irqrestore(&qp->s_lock, flags);
timeout = jiffies + SEND_RESCHED_TIMEOUT;
timeout = jiffies + (timeout_int) / 8;
cpu = priv->s_sde ? priv->s_sde->cpu :
cpumask_first(cpumask_of_node(ps.ppd->dd->node));
do {
/* Check for a constructed packet to be sent. */
if (qp->s_hdrwords != 0) {
@ -874,9 +889,18 @@ void hfi1_do_send(struct rvt_qp *qp)
/* allow other tasks to run */
if (unlikely(time_after(jiffies, timeout))) {
if (workqueue_congested(cpu, ps.ppd->hfi1_wq)) {
spin_lock_irqsave(&qp->s_lock, flags);
qp->s_flags &= ~RVT_S_BUSY;
hfi1_schedule_send(qp);
spin_unlock_irqrestore(&qp->s_lock,
flags);
this_cpu_inc(*ps.ppd->dd->send_schedule);
return;
}
cond_resched();
this_cpu_inc(*ps.ppd->dd->send_schedule);
timeout = jiffies + SEND_RESCHED_TIMEOUT;
timeout = jiffies + (timeout_int) / 8;
}
} while (make_req(qp));
}