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Commit bae73f44 authored by Divy Le Ray's avatar Divy Le Ray Committed by Jeff Garzik

cxgb3 - Recovery from HW starvation of response queue entries.

Improve the traffic recovery after the HW ran out of response queue entries.
Signed-off-by: default avatarDivy Le Ray <divy@chelsio.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 99d7cf30
......@@ -121,6 +121,8 @@ struct sge_rspq { /* state for an SGE response queue */
unsigned long empty; /* # of times queue ran out of credits */
unsigned long nomem; /* # of responses deferred due to no mem */
unsigned long unhandled_irqs; /* # of spurious intrs */
unsigned long starved;
unsigned long restarted;
};
struct tx_desc;
......
......@@ -2376,13 +2376,26 @@ static void sge_timer_cb(unsigned long data)
spin_unlock(&qs->txq[TXQ_OFLD].lock);
}
lock = (adap->flags & USING_MSIX) ? &qs->rspq.lock :
&adap->sge.qs[0].rspq.lock;
&adap->sge.qs[0].rspq.lock;
if (spin_trylock_irq(lock)) {
if (!napi_is_scheduled(qs->netdev)) {
u32 status = t3_read_reg(adap, A_SG_RSPQ_FL_STATUS);
if (qs->fl[0].credits < qs->fl[0].size)
__refill_fl(adap, &qs->fl[0]);
if (qs->fl[1].credits < qs->fl[1].size)
__refill_fl(adap, &qs->fl[1]);
if (status & (1 << qs->rspq.cntxt_id)) {
qs->rspq.starved++;
if (qs->rspq.credits) {
refill_rspq(adap, &qs->rspq, 1);
qs->rspq.credits--;
qs->rspq.restarted++;
t3_write_reg(adap, A_SG_RSPQ_FL_STATUS,
1 << qs->rspq.cntxt_id);
}
}
}
spin_unlock_irq(lock);
}
......
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