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Index: sys/conf/options
===================================================================
--- sys/conf/options
+++ sys/conf/options
@@ -996,3 +996,6 @@
EVDEV_SUPPORT opt_evdev.h
EVDEV_DEBUG opt_evdev.h
UINPUT_DEBUG opt_evdev.h
+
+# Hyper-V network driver
+HN_DEBUG opt_hn.h
Index: sys/dev/hyperv/netvsc/if_hn.c
===================================================================
--- sys/dev/hyperv/netvsc/if_hn.c
+++ sys/dev/hyperv/netvsc/if_hn.c
@@ -57,6 +57,7 @@
#include "opt_inet6.h"
#include "opt_inet.h"
+#include "opt_hn.h"
#include <sys/param.h>
#include <sys/bus.h>
@@ -1428,10 +1429,12 @@
txr->hn_txdesc_avail++;
SLIST_INSERT_HEAD(&txr->hn_txlist, txd, link);
mtx_unlock_spin(&txr->hn_txlist_spin);
-#else
+#else /* HN_USE_TXDESC_BUFRING */
+#ifdef HN_DEBUG
atomic_add_int(&txr->hn_txdesc_avail, 1);
- buf_ring_enqueue(txr->hn_txdesc_br, txd);
#endif
+ buf_ring_enqueue(txr->hn_txdesc_br, txd);
+#endif /* !HN_USE_TXDESC_BUFRING */
return 1;
}
@@ -1457,8 +1460,10 @@
if (txd != NULL) {
#ifdef HN_USE_TXDESC_BUFRING
+#ifdef HN_DEBUG
atomic_subtract_int(&txr->hn_txdesc_avail, 1);
#endif
+#endif /* HN_USE_TXDESC_BUFRING */
KASSERT(txd->m == NULL && txd->refs == 0 &&
STAILQ_EMPTY(&txd->agg_list) &&
txd->chim_index == HN_NVS_CHIM_IDX_INVALID &&
@@ -3467,9 +3472,11 @@
if (txr->hn_tx_sysctl_tree != NULL) {
child = SYSCTL_CHILDREN(txr->hn_tx_sysctl_tree);
+#ifdef HN_DEBUG
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "txdesc_avail",
CTLFLAG_RD, &txr->hn_txdesc_avail, 0,
"# of available TX descs");
+#endif
#ifdef HN_IFSTART_SUPPORT
if (!hn_use_if_start)
#endif
Index: sys/modules/hyperv/netvsc/Makefile
===================================================================
--- sys/modules/hyperv/netvsc/Makefile
+++ sys/modules/hyperv/netvsc/Makefile
@@ -5,7 +5,7 @@
KMOD= hv_netvsc
SRCS= hn_nvs.c hn_rndis.c if_hn.c
-SRCS+= bus_if.h device_if.h opt_inet.h opt_inet6.h vmbus_if.h
+SRCS+= bus_if.h device_if.h opt_inet.h opt_inet6.h vmbus_if.h opt_hn.h
CFLAGS+= -I${.CURDIR}/../../../dev/hyperv/netvsc

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