From owner-svn-src-head@FreeBSD.ORG  Thu Jun  5 00:38:33 2014
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 1D58E9DD;
 Thu,  5 Jun 2014 00:38:33 +0000 (UTC)
Received: from svn.freebsd.org (svn.freebsd.org
 [IPv6:2001:1900:2254:2068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 0B1D8267A;
 Thu,  5 Jun 2014 00:38:33 +0000 (UTC)
Received: from svn.freebsd.org ([127.0.1.70])
 by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s550cW2I011667;
 Thu, 5 Jun 2014 00:38:32 GMT (envelope-from np@svn.freebsd.org)
Received: (from np@localhost)
 by svn.freebsd.org (8.14.8/8.14.8/Submit) id s550cWnk011666;
 Thu, 5 Jun 2014 00:38:32 GMT (envelope-from np@svn.freebsd.org)
Message-Id: <201406050038.s550cWnk011666@svn.freebsd.org>
From: Navdeep Parhar <np@FreeBSD.org>
Date: Thu, 5 Jun 2014 00:38:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r267082 - head/sys/dev/cxgbe
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 05 Jun 2014 00:38:33 -0000

Author: np
Date: Thu Jun  5 00:38:32 2014
New Revision: 267082
URL: http://svnweb.freebsd.org/changeset/base/267082

Log:
  cxgbe(4):  Properly account for the freelist buffers used when returning
  early from service_iq due to a budget restriction.  This fixes a potential
  rx hang when using INTx.
  
  MFC after:	3 days

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

Modified: head/sys/dev/cxgbe/t4_sge.c
==============================================================================
--- head/sys/dev/cxgbe/t4_sge.c	Wed Jun  4 21:17:51 2014	(r267081)
+++ head/sys/dev/cxgbe/t4_sge.c	Thu Jun  5 00:38:32 2014	(r267082)
@@ -1424,8 +1424,15 @@ service_iq(struct sge_iq *iq, int budget
 				}
 #endif
 
-				if (budget)
+				if (budget) {
+					if (fl_bufs_used) {
+						FL_LOCK(fl);
+						fl->needed += fl_bufs_used;
+						refill_fl(sc, fl, 32);
+						FL_UNLOCK(fl);
+					}
 					return (EINPROGRESS);
+				}
 			}
 		}