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From: Navdeep Parhar <np@FreeBSD.org>
Date: Mon, 23 Jun 2014 05:42:52 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r267765 - stable/9/sys/dev/cxgbe
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Author: np
Date: Mon Jun 23 05:42:52 2014
New Revision: 267765
URL: http://svnweb.freebsd.org/changeset/base/267765

Log:
  MFC r267689:
  
  Consider the total number of descriptors available (and not just those
  that are ready to be reclaimed) when deciding whether to resume tx after
  a stall.

Modified:
  stable/9/sys/dev/cxgbe/t4_sge.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/dev/   (props changed)

Modified: stable/9/sys/dev/cxgbe/t4_sge.c
==============================================================================
--- stable/9/sys/dev/cxgbe/t4_sge.c	Mon Jun 23 05:39:10 2014	(r267764)
+++ stable/9/sys/dev/cxgbe/t4_sge.c	Mon Jun 23 05:42:52 2014	(r267765)
@@ -1679,7 +1679,7 @@ t4_wrq_tx_locked(struct adapter *sc, str
 
 	can_reclaim = reclaimable(eq);
 	if (__predict_false(eq->flags & EQ_STALLED)) {
-		if (can_reclaim < tx_resume_threshold(eq))
+		if (eq->avail + can_reclaim < tx_resume_threshold(eq))
 			return;
 		eq->flags &= ~EQ_STALLED;
 		eq->unstalled++;
@@ -1800,7 +1800,7 @@ t4_eth_tx(struct ifnet *ifp, struct sge_
 
 	can_reclaim = reclaimable(eq);
 	if (__predict_false(eq->flags & EQ_STALLED)) {
-		if (can_reclaim < tx_resume_threshold(eq)) {
+		if (eq->avail + can_reclaim < tx_resume_threshold(eq)) {
 			txq->m = m;
 			return (0);
 		}
@@ -1974,7 +1974,8 @@ t4_update_fl_bufsize(struct ifnet *ifp)
 int
 can_resume_tx(struct sge_eq *eq)
 {
-	return (reclaimable(eq) >= tx_resume_threshold(eq));
+
+	return (eq->avail + reclaimable(eq) >= tx_resume_threshold(eq));
 }
 
 static inline void