From 62cffb8d9339bf6a0a2b43453e8d30ff9d1e5de1 Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@FreeBSD.org>
Date: Mon, 25 Apr 2016 03:14:55 +0000
Subject: [PATCH] hn: Increase odrops for if_transmit method if drbr_enqueue
 fails.

MFC after:	1 week
Sponsored by:	Microsoft OSTC
---
 sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
index 906aeed6efec..b01930c7b456 100644
--- a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -2700,8 +2700,10 @@ hn_transmit(struct ifnet *ifp, struct mbuf *m)
 	txr = &sc->hn_tx_ring[idx];
 
 	error = drbr_enqueue(ifp, txr->hn_mbuf_br, m);
-	if (error)
+	if (error) {
+		if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 		return error;
+	}
 
 	if (txr->hn_oactive)
 		return 0;