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Commit bae73f44 authored by Divy Le Ray's avatar Divy Le Ray Committed by Jeff Garzik
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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
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+2 −0
Original line number Original line Diff line number Diff line
@@ -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;
+14 −1
Original line number Original line Diff line number Diff line
@@ -2379,10 +2379,23 @@ static void sge_timer_cb(unsigned long data)
					    &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);
	}
	}