From 59150e914165ff290237ce23d3a65d4e78da19e1 Mon Sep 17 00:00:00 2001
From: Alexander Motin <mav@FreeBSD.org>
Date: Sat, 29 Apr 2017 08:28:59 +0000
Subject: [PATCH] Propagate IFCAP_LRO from trunk to vlan interface.

False positive here cost nothing, while false negative may lead to some
confusions.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
---
 sys/net/if_vlan.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 3d312ae2a54..dbfac38f9bf 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1590,6 +1590,16 @@ vlan_capabilities(struct ifvlan *ifv)
 			hwa |= p->if_hwassist & CSUM_TSO;
 	}
 
+	/*
+	 * If the parent interface can do LRO and checksum offloading on
+	 * VLANs, then guess it may do LRO on VLANs.  False positive here
+	 * cost nothing, while false negative may lead to some confusions.
+	 */
+	if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
+		cap |= p->if_capabilities & IFCAP_LRO;
+	if (p->if_capenable & IFCAP_VLAN_HWCSUM)
+		ena |= p->if_capenable & IFCAP_LRO;
+
 	/*
 	 * If the parent interface can offload TCP connections over VLANs then
 	 * propagate its TOE capability to the VLAN interface.