Index: head/sys/dev/hyperv/netvsc/hv_net_vsc.h
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_net_vsc.h
+++ head/sys/dev/hyperv/netvsc/hv_net_vsc.h
@@ -1017,6 +1017,8 @@
 #define HN_TRUST_HCSUM_TCP	0x0002
 #define HN_TRUST_HCSUM_UDP	0x0004
 
+struct hv_vmbus_channel;
+
 struct hn_tx_ring {
 #ifndef HN_USE_TXDESC_BUFRING
 	struct mtx	hn_txlist_spin;
@@ -1039,6 +1041,7 @@
 
 	struct mtx	hn_tx_lock;
 	struct hn_softc	*hn_sc;
+	struct hv_vmbus_channel *hn_chan;
 
 	int		hn_direct_tx_size;
 	int		hn_tx_chimney_size;
@@ -1096,7 +1099,7 @@
     void *additional_info);
 int hv_nv_on_device_remove(struct hv_device *device,
     boolean_t destroy_channel);
-int hv_nv_on_send(struct hv_device *device, netvsc_packet *pkt);
+int hv_nv_on_send(struct hv_vmbus_channel *chan, netvsc_packet *pkt);
 int hv_nv_get_next_send_section(netvsc_dev *net_dev);
 
 #endif  /* __HV_NET_VSC_H__ */
Index: head/sys/dev/hyperv/netvsc/hv_net_vsc.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_net_vsc.c
+++ head/sys/dev/hyperv/netvsc/hv_net_vsc.c
@@ -809,7 +809,7 @@
  * Returns 0 on success, non-zero on failure.
  */
 int
-hv_nv_on_send(struct hv_device *device, netvsc_packet *pkt)
+hv_nv_on_send(struct hv_vmbus_channel *chan, netvsc_packet *pkt)
 {
 	nvsp_msg send_msg;
 	int ret;
@@ -829,11 +829,11 @@
 	    pkt->send_buf_section_size;
 
 	if (pkt->page_buf_count) {
-		ret = hv_vmbus_channel_send_packet_pagebuffer(device->channel,
+		ret = hv_vmbus_channel_send_packet_pagebuffer(chan,
 		    pkt->page_buffers, pkt->page_buf_count,
 		    &send_msg, sizeof(nvsp_msg), (uint64_t)(uintptr_t)pkt);
 	} else {
-		ret = hv_vmbus_channel_send_packet(device->channel,
+		ret = hv_vmbus_channel_send_packet(chan,
 		    &send_msg, sizeof(nvsp_msg), (uint64_t)(uintptr_t)pkt,
 		    HV_VMBUS_PACKET_TYPE_DATA_IN_BAND,
 		    HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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
@@ -436,6 +436,7 @@
 	chan = device_ctx->channel;
 	chan->hv_chan_rxr = &sc->hn_rx_ring[0];
 	chan->hv_chan_txr = &sc->hn_tx_ring[0];
+	sc->hn_tx_ring[0].hn_chan = chan;
 
 	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 	ifp->if_dunit = unit;
@@ -854,6 +855,8 @@
 
 	/*
 	 * Chimney send, if the packet could fit into one chimney buffer.
+	 *
+	 * TODO: vRSS, chimney buffer should be per-channel.
 	 */
 	if (packet->tot_data_buf_len < txr->hn_tx_chimney_size) {
 		netvsc_dev *net_dev = txr->hn_sc->net_dev;
@@ -940,8 +943,7 @@
  * associated w/ the txd will _not_ be freed.
  */
 static int
-hn_send_pkt(struct ifnet *ifp, struct hv_device *device_ctx,
-    struct hn_tx_ring *txr, struct hn_txdesc *txd)
+hn_send_pkt(struct ifnet *ifp, struct hn_tx_ring *txr, struct hn_txdesc *txd)
 {
 	int error, send_failed = 0;
 
@@ -950,7 +952,7 @@
 	 * Make sure that txd is not freed before ETHER_BPF_MTAP.
 	 */
 	hn_txdesc_hold(txd);
-	error = hv_nv_on_send(device_ctx, &txd->netvsc_pkt);
+	error = hv_nv_on_send(txr->hn_chan, &txd->netvsc_pkt);
 	if (!error) {
 		ETHER_BPF_MTAP(ifp, txd->m);
 		if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
@@ -1010,7 +1012,6 @@
 {
 	struct hn_softc *sc = txr->hn_sc;
 	struct ifnet *ifp = sc->hn_ifp;
-	struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
 
 	KASSERT(hn_use_if_start,
 	    ("hn_start_locked is called, when if_start is disabled"));
@@ -1054,7 +1055,7 @@
 			continue;
 		}
 
-		error = hn_send_pkt(ifp, device_ctx, txr, txd);
+		error = hn_send_pkt(ifp, txr, txd);
 		if (__predict_false(error)) {
 			/* txd is freed, but m_head is not */
 			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
@@ -2497,7 +2498,6 @@
 {
 	struct hn_softc *sc = txr->hn_sc;
 	struct ifnet *ifp = sc->hn_ifp;
-	struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
 	struct mbuf *m_head;
 
 	mtx_assert(&txr->hn_tx_lock, MA_OWNED);
@@ -2536,7 +2536,7 @@
 			continue;
 		}
 
-		error = hn_send_pkt(ifp, device_ctx, txr, txd);
+		error = hn_send_pkt(ifp, txr, txd);
 		if (__predict_false(error)) {
 			/* txd is freed, but m_head is not */
 			drbr_putback(ifp, txr->hn_mbuf_br, m_head);
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
@@ -250,7 +250,7 @@
 	    NVSP_1_CHIMNEY_SEND_INVALID_SECTION_INDEX;
 	packet->send_buf_section_size = 0;
 
-	ret = hv_nv_on_send(device->net_dev->dev, packet);
+	ret = hv_nv_on_send(device->net_dev->dev->channel, packet);
 
 	return (ret);
 }