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Index: share/man/man4/smsc.4
===================================================================
--- share/man/man4/smsc.4
+++ share/man/man4/smsc.4
@@ -72,6 +72,23 @@
.It
SMSC LAN951x Ethernet adapters with integrated USB hub
.El
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width indent
+.It Va hw.usb.smsc.turbo_mode
+Disable or enable
+.Dq turbo mode
+which allows multiple frames to be received
+in each transaction.
+This increases throughput at the cost of latency and jitter.
+Disabling it by be useful for timekeeping or for VoIP applications.
+Default is
+.Dq Li 1
+(enabled).
+.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr intro 4 ,
Index: sys/dev/usb/net/if_smsc.c
===================================================================
--- sys/dev/usb/net/if_smsc.c
+++ sys/dev/usb/net/if_smsc.c
@@ -112,14 +112,19 @@
#include <dev/usb/net/if_smscreg.h>
+SYSCTL_NODE(_hw_usb, OID_AUTO, smsc, CTLFLAG_RW, 0, "USB smsc");
+
#ifdef USB_DEBUG
static int smsc_debug = 0;
-SYSCTL_NODE(_hw_usb, OID_AUTO, smsc, CTLFLAG_RW, 0, "USB smsc");
SYSCTL_INT(_hw_usb_smsc, OID_AUTO, debug, CTLFLAG_RWTUN, &smsc_debug, 0,
"Debug level");
#endif
+static int smsc_turbo_mode = 1;
+SYSCTL_INT(_hw_usb_smsc, OID_AUTO, turbo_mode, CTLFLAG_RDTUN, &smsc_turbo_mode, 1,
+ "Turbo mode");
+
/*
* Various supported device vendors/products.
*/
@@ -1398,10 +1403,13 @@
* Burst capability is the number of URBs that can be in a burst of data/
* ethernet frames.
*/
- if (usbd_get_speed(sc->sc_ue.ue_udev) == USB_SPEED_HIGH)
- burst_cap = 37;
- else
- burst_cap = 128;
+ if (smsc_turbo_mode) {
+ if (usbd_get_speed(sc->sc_ue.ue_udev) == USB_SPEED_HIGH)
+ burst_cap = 37;
+ else
+ burst_cap = 128;
+ } else
+ burst_cap = 0;
smsc_write_reg(sc, SMSC_BURST_CAP, burst_cap);
@@ -1427,7 +1435,8 @@
/* The following setings are used for 'turbo mode', a.k.a multiple frames
* per Rx transaction (again info taken form Linux driver).
*/
- reg_val |= (SMSC_HW_CFG_MEF | SMSC_HW_CFG_BCE);
+ if (smsc_turbo_mode)
+ reg_val |= (SMSC_HW_CFG_MEF | SMSC_HW_CFG_BCE);
smsc_write_reg(sc, SMSC_HW_CFG, reg_val);

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