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cxgb3 - Recovery from HW starvation of response queue entries.

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Improve the traffic recovery after the HW ran out of response queue entries.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Divy Le Ray
2007-02-24 16:44:12 -08:00
committed by Jeff Garzik
parent 99d7cf30b9
commit bae73f4447
2 changed files with 16 additions and 1 deletions
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2
drivers/net/cxgb3/adapter.h
View File

@@ -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 empty; /* # of times queue ran out of credits */
unsigned long nomem; /* # of responses deferred due to no mem */ unsigned long nomem; /* # of responses deferred due to no mem */
unsigned long unhandled_irqs; /* # of spurious intrs */ unsigned long unhandled_irqs; /* # of spurious intrs */
unsigned long starved;
unsigned long restarted;
}; };
struct tx_desc; struct tx_desc;

15
drivers/net/cxgb3/sge.c
View File

@@ -2376,13 +2376,26 @@ static void sge_timer_cb(unsigned long data)
spin_unlock(&qs->txq[TXQ_OFLD].lock); spin_unlock(&qs->txq[TXQ_OFLD].lock);
} }
lock = (adap->flags & USING_MSIX) ? &qs->rspq.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 (spin_trylock_irq(lock)) {
if (!napi_is_scheduled(qs->netdev)) { 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) if (qs->fl[0].credits < qs->fl[0].size)
__refill_fl(adap, &qs->fl[0]); __refill_fl(adap, &qs->fl[0]);
if (qs->fl[1].credits < qs->fl[1].size) if (qs->fl[1].credits < qs->fl[1].size)
__refill_fl(adap, &qs->fl[1]); __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); spin_unlock_irq(lock);
} }