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Date:      Sat, 4 Jun 2011 23:31:33 +0000 (UTC)
From:      Navdeep Parhar <np@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r222701 - head/sys/dev/cxgbe
Message-ID:  <201106042331.p54NVX4v030710@svn.freebsd.org>
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Author: np
Date: Sat Jun  4 23:31:33 2011
New Revision: 222701
URL: http://svn.freebsd.org/changeset/base/222701

Log:
  Allow lazy fill up of freelists.
  
  MFC after:	3 days

Modified:
  head/sys/dev/cxgbe/adapter.h
  head/sys/dev/cxgbe/t4_sge.c

Modified: head/sys/dev/cxgbe/adapter.h
==============================================================================
--- head/sys/dev/cxgbe/adapter.h	Sat Jun  4 22:51:06 2011	(r222700)
+++ head/sys/dev/cxgbe/adapter.h	Sat Jun  4 23:31:33 2011	(r222701)
@@ -396,6 +396,7 @@ struct sge_ctrlq {
 struct sge {
 	uint16_t timer_val[SGE_NTIMERS];
 	uint8_t  counter_val[SGE_NCOUNTERS];
+	int fl_starve_threshold;
 
 	int nrxq;	/* total rx queues (all ports and the rest) */
 	int ntxq;	/* total tx queues (all ports and the rest) */

Modified: head/sys/dev/cxgbe/t4_sge.c
==============================================================================
--- head/sys/dev/cxgbe/t4_sge.c	Sat Jun  4 22:51:06 2011	(r222700)
+++ head/sys/dev/cxgbe/t4_sge.c	Sat Jun  4 23:31:33 2011	(r222701)
@@ -203,6 +203,9 @@ t4_sge_init(struct adapter *sc)
 		    FL_BUF_SIZE(i));
 	}
 
+	i = t4_read_reg(sc, A_SGE_CONM_CTRL);
+	s->fl_starve_threshold = G_EGRTHRESHOLD(i) * 2 + 1;
+
 	t4_write_reg(sc, A_SGE_INGRESS_RX_THRESHOLD,
 		     V_THRESHOLD_0(s->counter_val[0]) |
 		     V_THRESHOLD_1(s->counter_val[1]) |
@@ -1233,7 +1236,8 @@ alloc_iq_fl(struct port_info *pi, struct
 		sc->sge.eqmap[cntxt_id] = (void *)fl;
 
 		FL_LOCK(fl);
-		refill_fl(sc, fl, -1, 8);
+		/* Just enough to make sure it doesn't starve right away. */
+		refill_fl(sc, fl, roundup(sc->sge.fl_starve_threshold, 8), 8);
 		FL_UNLOCK(fl);
 	}
 
@@ -1389,6 +1393,10 @@ alloc_rxq(struct port_info *pi, struct s
 	if (rc != 0)
 		return (rc);
 
+	FL_LOCK(&rxq->fl);
+	refill_fl(pi->adapter, &rxq->fl, rxq->fl.needed / 8, 8);
+	FL_UNLOCK(&rxq->fl);
+
 #ifdef INET
 	rc = tcp_lro_init(&rxq->lro);
 	if (rc != 0)

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