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[src/trunk]: src/sys/dev/usb - remove unused uncd_rx_cnt
details: https://anonhg.NetBSD.org/src/rev/c2be4f970ff0
branches: trunk
changeset: 459071:c2be4f970ff0
user: mrg <mrg%NetBSD.org@localhost>
date: Fri Aug 23 04:29:28 2019 +0000
description:
- remove unused uncd_rx_cnt
- add USBNETHIST_CALLARGSN and use it in many places
- add more history logs
- add a log if watchdog abort leaves uncd_tx_cnt non zero
- add a unique (32-bit) number for a each usbnet device and
use it for logging
- explicitly check for full tx ring in usbnet_start_locked()
and return early, which avoids setting the 5 second timer
and triggering a watchdog
- reset uncd_tx_prod and uncd_tx_cnt to zero in stop
diffstat:
sys/dev/usb/usbnet.c | 62 ++++++++++++++++++++++++++++++++++++++++++---------
1 files changed, 51 insertions(+), 11 deletions(-)
diffs (232 lines):
diff -r 9076840c3062 -r c2be4f970ff0 sys/dev/usb/usbnet.c
--- a/sys/dev/usb/usbnet.c Fri Aug 23 02:33:15 2019 +0000
+++ b/sys/dev/usb/usbnet.c Fri Aug 23 04:29:28 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: usbnet.c,v 1.22 2019/08/20 06:37:06 mrg Exp $ */
+/* $NetBSD: usbnet.c,v 1.23 2019/08/23 04:29:28 mrg Exp $ */
/*
* Copyright (c) 2019 Matthew R. Green
@@ -33,12 +33,13 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: usbnet.c,v 1.22 2019/08/20 06:37:06 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: usbnet.c,v 1.23 2019/08/23 04:29:28 mrg Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/module.h>
+#include <sys/atomic.h>
#include <dev/usb/usbnet.h>
#include <dev/usb/usbhist.h>
@@ -49,7 +50,6 @@
int uncd_tx_prod;
int uncd_tx_cnt;
- int uncd_rx_cnt;
};
struct usbnet_private {
@@ -82,6 +82,7 @@
int unp_refcnt;
int unp_timer;
int unp_if_flags;
+ unsigned unp_number;
krndsource_t unp_rndsrc;
@@ -92,6 +93,8 @@
#define un_cdata(un) (&(un)->un_pri->unp_cdata)
+volatile unsigned usbnet_number;
+
static int usbnet_modcmd(modcmd_t, void *);
#ifdef USB_DEBUG
@@ -136,6 +139,8 @@
#define USBNETHIST_CALLED(name) USBHIST_CALLED(usbnetdebug)
#define USBNETHIST_CALLARGS(FMT,A,B,C,D) \
USBHIST_CALLARGS(usbnetdebug,FMT,A,B,C,D)
+#define USBNETHIST_CALLARGSN(N,FMT,A,B,C,D) \
+ USBHIST_CALLARGSN(usbnetdebug,N,FMT,A,B,C,D)
/* Callback vectors. */
@@ -246,14 +251,19 @@
usbnet_enqueue(struct usbnet * const un, uint8_t *buf, size_t buflen,
int csum_flags, uint32_t csum_data, int mbuf_flags)
{
- USBNETHIST_FUNC(); USBNETHIST_CALLED();
+ USBNETHIST_FUNC();
struct ifnet * const ifp = usbnet_ifp(un);
+ struct usbnet_private * const unp __unused = un->un_pri;
struct mbuf *m;
+ USBNETHIST_CALLARGSN(5, "%d: enter: len=%zu csf %x mbf %x",
+ unp->unp_number, buflen, csum_flags, mbuf_flags);
+
usbnet_isowned_rx(un);
m = usbnet_newbuf(buflen);
if (m == NULL) {
+ DPRINTF("%d: no memory", unp->unp_number, 0, 0, 0);
ifp->if_ierrors++;
return;
}
@@ -271,13 +281,15 @@
void
usbnet_input(struct usbnet * const un, uint8_t *buf, size_t buflen)
{
- USBNETHIST_FUNC(); USBNETHIST_CALLED();
+ USBNETHIST_FUNC();
struct ifnet * const ifp = usbnet_ifp(un);
+ struct usbnet_private * const unp __unused = un->un_pri;
struct mbuf *m;
+ USBNETHIST_CALLARGSN(5, "%d: enter: buf %jx len %ju",
+ unp->unp_number, (uintptr_t)buf, buflen, 0);
+
usbnet_isowned_rx(un);
- DPRINTFN(0, "called! un %jx buf %jx len %ju",
- (uintmax_t)(uintptr_t)un, (uintmax_t)(uintptr_t)buf, buflen, 0);
m = usbnet_newbuf(buflen);
if (m == NULL) {
@@ -299,13 +311,16 @@
static void
usbnet_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
- USBNETHIST_FUNC(); USBNETHIST_CALLED();
+ USBNETHIST_FUNC();
struct usbnet_chain * const c = priv;
struct usbnet * const un = c->unc_un;
struct usbnet_private * const unp = un->un_pri;
struct ifnet * const ifp = usbnet_ifp(un);
uint32_t total_len;
+ USBNETHIST_CALLARGSN(5, "%d: enter: status %x xfer %jx",
+ unp->unp_number, status, (uintptr_t)xfer, 0);
+
mutex_enter(&unp->unp_rxlock);
if (unp->unp_dying || unp->unp_stopping ||
@@ -360,6 +375,9 @@
struct usbnet_private * const unp = un->un_pri;
struct ifnet * const ifp = usbnet_ifp(un);
+ USBNETHIST_CALLARGSN(5, "%d: enter: status %x xfer %jx",
+ unp->unp_number, status, (uintptr_t)xfer, 0);
+
mutex_enter(&unp->unp_txlock);
if (unp->unp_stopping || unp->unp_dying) {
mutex_exit(&unp->unp_txlock);
@@ -443,22 +461,32 @@
return;
}
+ if (cd->uncd_tx_cnt == un->un_tx_list_cnt) {
+ DPRINTF("start called, tx busy (%jx == %jx)",
+ cd->uncd_tx_cnt, un->un_tx_list_cnt, 0, 0);
+ return;
+ }
+
idx = cd->uncd_tx_prod;
while (cd->uncd_tx_cnt < un->un_tx_list_cnt) {
IFQ_POLL(&ifp->if_snd, m);
- if (m == NULL)
+ if (m == NULL) {
+ DPRINTF("start called, queue empty", 0, 0, 0, 0);
break;
+ }
KASSERT(m->m_pkthdr.len <= un->un_tx_bufsz);
struct usbnet_chain *c = &cd->uncd_tx_chain[idx];
length = uno_tx_prepare(un, m, c);
if (length == 0) {
+ DPRINTF("uno_tx_prepare gave zero length", 0, 0, 0, 0);
ifp->if_oerrors++;
break;
}
if (__predict_false(c->unc_xfer == NULL)) {
+ DPRINTF("unc_xfer is NULL", 0, 0, 0, 0);
ifp->if_oerrors++;
break;
}
@@ -469,6 +497,8 @@
/* Transmit */
usbd_status err = usbd_transfer(c->unc_xfer);
if (err != USBD_IN_PROGRESS) {
+ DPRINTF("usbd_transfer on %jx for %ju bytes: %d",
+ (uintptr_t)c->unc_buf, length, err, 0);
ifp->if_oerrors++;
break;
}
@@ -665,6 +695,7 @@
c->unc_buf = NULL;
}
}
+ cd->uncd_tx_prod = cd->uncd_tx_cnt = 0;
}
/* End of common TX functions */
@@ -976,10 +1007,14 @@
static int
usbnet_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
- USBNETHIST_FUNC(); USBNETHIST_CALLED();
+ USBNETHIST_FUNC();
struct usbnet * const un = ifp->if_softc;
+ struct usbnet_private * const unp __unused = un->un_pri;
int error;
+ USBNETHIST_CALLARGSN(11, "%d: enter %jx data %x",
+ unp->unp_number, cmd, (uintptr_t)data, 0);
+
if (un->un_ops->uno_override_ioctl)
return uno_override_ioctl(un, ifp, cmd, data);
@@ -1077,6 +1112,7 @@
static void
usbnet_watchdog(struct ifnet *ifp)
{
+ USBNETHIST_FUNC(); USBNETHIST_CALLED();
struct usbnet * const un = ifp->if_softc;
struct usbnet_private * const unp = un->un_pri;
struct usbnet_cdata * const cd = un_cdata(un);
@@ -1086,10 +1122,13 @@
aprint_error_dev(un->un_dev, "watchdog timeout\n");
if (cd->uncd_tx_cnt > 0) {
+ DPRINTF("uncd_tx_cnt=%u non zero, aborting pipe", 0, 0, 0, 0);
err = usbd_abort_pipe(unp->unp_ep[USBNET_ENDPT_TX]);
if (err)
aprint_error_dev(un->un_dev, "pipe abort failed: %s\n",
usbd_errstr(err));
+ if (cd->uncd_tx_cnt != 0)
+ DPRINTF("uncd_tx_cnt now %u", cd->uncd_tx_cnt, 0, 0, 0);
}
if (!IFQ_IS_EMPTY(&ifp->if_snd))
@@ -1099,7 +1138,6 @@
static void
usbnet_tick_task(void *arg)
{
- USBNETHIST_FUNC(); USBNETHIST_CALLED();
struct usbnet * const un = arg;
struct usbnet_private * const unp = un->un_pri;
@@ -1320,6 +1358,8 @@
usbnet_rx_list_alloc(un);
usbnet_tx_list_alloc(un);
+ unp->unp_number = atomic_inc_uint_nv(&usbnet_number);
+
unp->unp_attached = true;
}
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