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Date:      Mon, 11 Jul 2016 06:23:01 +0000 (UTC)
From:      Sepherosa Ziehau <sephe@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r302544 - head/sys/dev/hyperv/netvsc
Message-ID:  <201607110623.u6B6N1Sf044027@repo.freebsd.org>
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Author: sephe
Date: Mon Jul 11 06:23:01 2016
New Revision: 302544
URL: https://svnweb.freebsd.org/changeset/base/302544

Log:
  hyperv/hn: Add tunable to allow tcp_lro_queue_mbuf()
  
  MFC after:	1 week
  Sponsored by:	Microsoft OSTC
  Differential Revision:	https://reviews.freebsd.org/D6841

Modified:
  head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c

Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Mon Jul 11 06:11:24 2016	(r302543)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Mon Jul 11 06:23:01 2016	(r302544)
@@ -299,6 +299,12 @@ static int hn_tx_swq_depth = 0;
 SYSCTL_INT(_hw_hn, OID_AUTO, tx_swq_depth, CTLFLAG_RDTUN,
     &hn_tx_swq_depth, 0, "Depth of IFQ or BUFRING");
 
+#if __FreeBSD_version >= 1100095
+static u_int hn_lro_mbufq_depth = 0;
+SYSCTL_UINT(_hw_hn, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN,
+    &hn_lro_mbufq_depth, 0, "Depth of LRO mbuf queue");
+#endif
+
 static u_int hn_cpu_index;
 
 /*
@@ -1283,6 +1289,19 @@ hv_m_append(struct mbuf *m0, int len, c_
 	return (remainder == 0);
 }
 
+#if defined(INET) || defined(INET6)
+static __inline int
+hn_lro_rx(struct lro_ctrl *lc, struct mbuf *m)
+{
+#if __FreeBSD_version >= 1100095
+	if (hn_lro_mbufq_depth) {
+		tcp_lro_queue_mbuf(lc, m);
+		return 0;
+	}
+#endif
+	return tcp_lro_rx(lc, m, 0);
+}
+#endif
 
 /*
  * Called when we receive a data packet from the "wire" on the
@@ -1488,7 +1507,7 @@ skip:
 
 		if (lro->lro_cnt) {
 			rxr->hn_lro_tried++;
-			if (tcp_lro_rx(lro, m_new, 0) == 0) {
+			if (hn_lro_rx(lro, m_new) == 0) {
 				/* DONE! */
 				return 0;
 			}
@@ -2223,7 +2242,8 @@ hn_create_rx_data(struct hn_softc *sc, i
 		 */
 #if defined(INET) || defined(INET6)
 #if __FreeBSD_version >= 1100095
-		tcp_lro_init_args(&rxr->hn_lro, sc->hn_ifp, lroent_cnt, 0);
+		tcp_lro_init_args(&rxr->hn_lro, sc->hn_ifp, lroent_cnt,
+		    hn_lro_mbufq_depth);
 #else
 		tcp_lro_init(&rxr->hn_lro);
 		rxr->hn_lro.ifp = sc->hn_ifp;

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