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hyperv/hn: Add HN_DEBUG kernel option.

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If bufring is used for per-TX ring descs, don't update "available"
counter, which is only used to help debugging.

MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8674
This commit is contained in:
Sepherosa Ziehau 2016-12-01 03:27:16 +00:00
parent 71462f5652
commit 85e4ae1e13
3 changed files with 12 additions and 3 deletions
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2
sys/conf/options
View File

@ -1001,3 +1001,5 @@ EVDEV_SUPPORT opt_evdev.h
EVDEV_DEBUG opt_evdev.h
UINPUT_DEBUG opt_evdev.h
# Hyper-V network driver
HN_DEBUG opt_hn.h

11
sys/dev/hyperv/netvsc/if_hn.c
View File

@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include "opt_inet.h"
#include "opt_hn.h"
#include <sys/param.h>
#include <sys/bus.h>
@ -1428,10 +1429,12 @@ hn_txdesc_put(struct hn_tx_ring *txr, struct hn_txdesc *txd)
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 @@ hn_txdesc_get(struct hn_tx_ring *txr)
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 @@ hn_tx_ring_create(struct hn_softc *sc, int id)
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

2
sys/modules/hyperv/netvsc/Makefile
View File

@ -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