Index: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -1244,6 +1244,42 @@
 	return (ofs - __offsetof(struct rndis_packet_msg, rm_dataoffset));
 }
 
+static __inline void *
+hn_rndis_pktinfo_append(struct rndis_packet_msg *pkt, size_t pktsize,
+    size_t pi_dlen, uint32_t pi_type)
+{
+	const size_t pi_size = HN_RNDIS_PKTINFO_SIZE(pi_dlen);
+	struct rndis_pktinfo *pi;
+
+	KASSERT((pi_size & RNDIS_PACKET_MSG_OFFSET_ALIGNMASK) == 0,
+	    ("unaligned pktinfo size %zu, pktinfo dlen %zu", pi_size, pi_dlen));
+
+	/*
+	 * Per-packet-info does not move; it only grows.
+	 *
+	 * NOTE:
+	 * rm_pktinfooffset in this phase counts from the beginning
+	 * of rndis_packet_msg.
+	 */
+	KASSERT(pkt->rm_pktinfooffset + pkt->rm_pktinfolen + pi_size <= pktsize,
+	    ("%u pktinfo overflows RNDIS packet msg", pi_type));
+	pi = (struct rndis_pktinfo *)((uint8_t *)pkt + pkt->rm_pktinfooffset +
+	    pkt->rm_pktinfolen);
+	pkt->rm_pktinfolen += pi_size;
+
+	pi->rm_size = pi_size;
+	pi->rm_type = pi_type;
+	pi->rm_pktinfooffset = RNDIS_PKTINFO_OFFSET;
+
+	/* Data immediately follow per-packet-info. */
+	pkt->rm_dataoffset += pi_size;
+
+	/* Update RNDIS packet msg length */
+	pkt->rm_len += pi_size;
+
+	return (pi->rm_data);
+}
+
 /*
  * NOTE:
  * If this function fails, then both txd and m_head0 will be freed.
Index: head/sys/dev/hyperv/netvsc/hv_rndis_filter.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_rndis_filter.c
+++ head/sys/dev/hyperv/netvsc/hv_rndis_filter.c
@@ -104,42 +104,6 @@
 	return ((rid & 0xffff) << 16);
 }
 
-void *
-hn_rndis_pktinfo_append(struct rndis_packet_msg *pkt, size_t pktsize,
-    size_t pi_dlen, uint32_t pi_type)
-{
-	const size_t pi_size = HN_RNDIS_PKTINFO_SIZE(pi_dlen);
-	struct rndis_pktinfo *pi;
-
-	KASSERT((pi_size & RNDIS_PACKET_MSG_OFFSET_ALIGNMASK) == 0,
-	    ("unaligned pktinfo size %zu, pktinfo dlen %zu", pi_size, pi_dlen));
-
-	/*
-	 * Per-packet-info does not move; it only grows.
-	 *
-	 * NOTE:
-	 * rm_pktinfooffset in this phase counts from the beginning
-	 * of rndis_packet_msg.
-	 */
-	KASSERT(pkt->rm_pktinfooffset + pkt->rm_pktinfolen + pi_size <= pktsize,
-	    ("%u pktinfo overflows RNDIS packet msg", pi_type));
-	pi = (struct rndis_pktinfo *)((uint8_t *)pkt + pkt->rm_pktinfooffset +
-	    pkt->rm_pktinfolen);
-	pkt->rm_pktinfolen += pi_size;
-
-	pi->rm_size = pi_size;
-	pi->rm_type = pi_type;
-	pi->rm_pktinfooffset = RNDIS_PKTINFO_OFFSET;
-
-	/* Data immediately follow per-packet-info. */
-	pkt->rm_dataoffset += pi_size;
-
-	/* Update RNDIS packet msg length */
-	pkt->rm_len += pi_size;
-
-	return (pi->rm_data);
-}
-
 void
 hn_rndis_rx_ctrl(struct hn_softc *sc, const void *data, int dlen)
 {
Index: head/sys/dev/hyperv/netvsc/if_hnvar.h
===================================================================
--- head/sys/dev/hyperv/netvsc/if_hnvar.h
+++ head/sys/dev/hyperv/netvsc/if_hnvar.h
@@ -231,13 +231,9 @@
 #define HN_LINK_FLAG_LINKUP		0x0001
 #define HN_LINK_FLAG_NETCHG		0x0002
 
-struct rndis_packet_msg;
-
 int		hn_rndis_attach(struct hn_softc *sc, int mtu);
 void		hn_rndis_detach(struct hn_softc *sc);
 int		hn_rndis_conf_rss(struct hn_softc *sc, uint16_t flags);
-void		*hn_rndis_pktinfo_append(struct rndis_packet_msg *,
-		    size_t pktsize, size_t pi_dlen, uint32_t pi_type);
 int		hn_rndis_query_rsscaps(struct hn_softc *sc, int *rxr_cnt);
 int		hn_rndis_get_eaddr(struct hn_softc *sc, uint8_t *eaddr);
 int		hn_rndis_get_linkstatus(struct hn_softc *sc,