xref: /dragonfly/sys/bus/u4b/net/if_kue.c (revision 25a2db75)
1 /*-
2  * Copyright (c) 1997, 1998, 1999, 2000
3  *	Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by Bill Paul.
16  * 4. Neither the name of the author nor the names of any co-contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 /*
37  * Kawasaki LSI KL5KUSB101B USB to ethernet adapter driver.
38  *
39  * Written by Bill Paul <wpaul@ee.columbia.edu>
40  * Electrical Engineering Department
41  * Columbia University, New York City
42  */
43 
44 /*
45  * The KLSI USB to ethernet adapter chip contains an USB serial interface,
46  * ethernet MAC and embedded microcontroller (called the QT Engine).
47  * The chip must have firmware loaded into it before it will operate.
48  * Packets are passed between the chip and host via bulk transfers.
49  * There is an interrupt endpoint mentioned in the software spec, however
50  * it's currently unused. This device is 10Mbps half-duplex only, hence
51  * there is no media selection logic. The MAC supports a 128 entry
52  * multicast filter, though the exact size of the filter can depend
53  * on the firmware. Curiously, while the software spec describes various
54  * ethernet statistics counters, my sample adapter and firmware combination
55  * claims not to support any statistics counters at all.
56  *
57  * Note that once we load the firmware in the device, we have to be
58  * careful not to load it again: if you restart your computer but
59  * leave the adapter attached to the USB controller, it may remain
60  * powered on and retain its firmware. In this case, we don't need
61  * to load the firmware a second time.
62  *
63  * Special thanks to Rob Furr for providing an ADS Technologies
64  * adapter for development and testing. No monkeys were harmed during
65  * the development of this driver.
66  */
67 
68 #include <sys/stdint.h>
69 #include <sys/stddef.h>
70 #include <sys/param.h>
71 #include <sys/queue.h>
72 #include <sys/types.h>
73 #include <sys/systm.h>
74 #include <sys/kernel.h>
75 #include <sys/bus.h>
76 #include <sys/module.h>
77 #include <sys/lock.h>
78 #include <sys/mutex.h>
79 #include <sys/condvar.h>
80 #include <sys/sysctl.h>
81 #include <sys/sx.h>
82 #include <sys/unistd.h>
83 #include <sys/callout.h>
84 #include <sys/malloc.h>
85 #include <sys/priv.h>
86 
87 #include <dev/usb/usb.h>
88 #include <dev/usb/usbdi.h>
89 #include <dev/usb/usbdi_util.h>
90 #include "usbdevs.h"
91 
92 #define	USB_DEBUG_VAR kue_debug
93 #include <dev/usb/usb_debug.h>
94 #include <dev/usb/usb_process.h>
95 
96 #include <dev/usb/net/usb_ethernet.h>
97 #include <dev/usb/net/if_kuereg.h>
98 #include <dev/usb/net/if_kuefw.h>
99 
100 /*
101  * Various supported device vendors/products.
102  */
103 static const STRUCT_USB_HOST_ID kue_devs[] = {
104 #define	KUE_DEV(v,p) { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
105 	KUE_DEV(3COM, 3C19250),
106 	KUE_DEV(3COM, 3C460),
107 	KUE_DEV(ABOCOM, URE450),
108 	KUE_DEV(ADS, UBS10BT),
109 	KUE_DEV(ADS, UBS10BTX),
110 	KUE_DEV(AOX, USB101),
111 	KUE_DEV(ASANTE, EA),
112 	KUE_DEV(ATEN, DSB650C),
113 	KUE_DEV(ATEN, UC10T),
114 	KUE_DEV(COREGA, ETHER_USB_T),
115 	KUE_DEV(DLINK, DSB650C),
116 	KUE_DEV(ENTREGA, E45),
117 	KUE_DEV(ENTREGA, XX1),
118 	KUE_DEV(ENTREGA, XX2),
119 	KUE_DEV(IODATA, USBETT),
120 	KUE_DEV(JATON, EDA),
121 	KUE_DEV(KINGSTON, XX1),
122 	KUE_DEV(KLSI, DUH3E10BT),
123 	KUE_DEV(KLSI, DUH3E10BTN),
124 	KUE_DEV(LINKSYS, USB10T),
125 	KUE_DEV(MOBILITY, EA),
126 	KUE_DEV(NETGEAR, EA101),
127 	KUE_DEV(NETGEAR, EA101X),
128 	KUE_DEV(PERACOM, ENET),
129 	KUE_DEV(PERACOM, ENET2),
130 	KUE_DEV(PERACOM, ENET3),
131 	KUE_DEV(PORTGEAR, EA8),
132 	KUE_DEV(PORTGEAR, EA9),
133 	KUE_DEV(PORTSMITH, EEA),
134 	KUE_DEV(SHARK, PA),
135 	KUE_DEV(SILICOM, GPE),
136 	KUE_DEV(SILICOM, U2E),
137 	KUE_DEV(SMC, 2102USB),
138 #undef KUE_DEV
139 };
140 
141 /* prototypes */
142 
143 static device_probe_t kue_probe;
144 static device_attach_t kue_attach;
145 static device_detach_t kue_detach;
146 
147 static usb_callback_t kue_bulk_read_callback;
148 static usb_callback_t kue_bulk_write_callback;
149 
150 static uether_fn_t kue_attach_post;
151 static uether_fn_t kue_init;
152 static uether_fn_t kue_stop;
153 static uether_fn_t kue_start;
154 static uether_fn_t kue_setmulti;
155 static uether_fn_t kue_setpromisc;
156 
157 static int	kue_do_request(struct kue_softc *,
158 		    struct usb_device_request *, void *);
159 static int	kue_setword(struct kue_softc *, uint8_t, uint16_t);
160 static int	kue_ctl(struct kue_softc *, uint8_t, uint8_t, uint16_t,
161 		    void *, int);
162 static int	kue_load_fw(struct kue_softc *);
163 static void	kue_reset(struct kue_softc *);
164 
165 #ifdef USB_DEBUG
166 static int kue_debug = 0;
167 
168 static SYSCTL_NODE(_hw_usb, OID_AUTO, kue, CTLFLAG_RW, 0, "USB kue");
169 SYSCTL_INT(_hw_usb_kue, OID_AUTO, debug, CTLFLAG_RW, &kue_debug, 0,
170     "Debug level");
171 #endif
172 
173 static const struct usb_config kue_config[KUE_N_TRANSFER] = {
174 
175 	[KUE_BULK_DT_WR] = {
176 		.type = UE_BULK,
177 		.endpoint = UE_ADDR_ANY,
178 		.direction = UE_DIR_OUT,
179 		.bufsize = (MCLBYTES + 2 + 64),
180 		.flags = {.pipe_bof = 1,},
181 		.callback = kue_bulk_write_callback,
182 		.timeout = 10000,	/* 10 seconds */
183 	},
184 
185 	[KUE_BULK_DT_RD] = {
186 		.type = UE_BULK,
187 		.endpoint = UE_ADDR_ANY,
188 		.direction = UE_DIR_IN,
189 		.bufsize = (MCLBYTES + 2),
190 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
191 		.callback = kue_bulk_read_callback,
192 		.timeout = 0,	/* no timeout */
193 	},
194 };
195 
196 static device_method_t kue_methods[] = {
197 	/* Device interface */
198 	DEVMETHOD(device_probe, kue_probe),
199 	DEVMETHOD(device_attach, kue_attach),
200 	DEVMETHOD(device_detach, kue_detach),
201 
202 	DEVMETHOD_END
203 };
204 
205 static driver_t kue_driver = {
206 	.name = "kue",
207 	.methods = kue_methods,
208 	.size = sizeof(struct kue_softc),
209 };
210 
211 static devclass_t kue_devclass;
212 
213 DRIVER_MODULE(kue, uhub, kue_driver, kue_devclass, NULL, 0);
214 MODULE_DEPEND(kue, uether, 1, 1, 1);
215 MODULE_DEPEND(kue, usb, 1, 1, 1);
216 MODULE_DEPEND(kue, ether, 1, 1, 1);
217 MODULE_VERSION(kue, 1);
218 
219 static const struct usb_ether_methods kue_ue_methods = {
220 	.ue_attach_post = kue_attach_post,
221 	.ue_start = kue_start,
222 	.ue_init = kue_init,
223 	.ue_stop = kue_stop,
224 	.ue_setmulti = kue_setmulti,
225 	.ue_setpromisc = kue_setpromisc,
226 };
227 
228 /*
229  * We have a custom do_request function which is almost like the
230  * regular do_request function, except it has a much longer timeout.
231  * Why? Because we need to make requests over the control endpoint
232  * to download the firmware to the device, which can take longer
233  * than the default timeout.
234  */
235 static int
236 kue_do_request(struct kue_softc *sc, struct usb_device_request *req,
237     void *data)
238 {
239 	usb_error_t err;
240 
241 	err = uether_do_request(&sc->sc_ue, req, data, 60000);
242 
243 	return (err);
244 }
245 
246 static int
247 kue_setword(struct kue_softc *sc, uint8_t breq, uint16_t word)
248 {
249 	struct usb_device_request req;
250 
251 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
252 	req.bRequest = breq;
253 	USETW(req.wValue, word);
254 	USETW(req.wIndex, 0);
255 	USETW(req.wLength, 0);
256 
257 	return (kue_do_request(sc, &req, NULL));
258 }
259 
260 static int
261 kue_ctl(struct kue_softc *sc, uint8_t rw, uint8_t breq,
262     uint16_t val, void *data, int len)
263 {
264 	struct usb_device_request req;
265 
266 	if (rw == KUE_CTL_WRITE)
267 		req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
268 	else
269 		req.bmRequestType = UT_READ_VENDOR_DEVICE;
270 
271 
272 	req.bRequest = breq;
273 	USETW(req.wValue, val);
274 	USETW(req.wIndex, 0);
275 	USETW(req.wLength, len);
276 
277 	return (kue_do_request(sc, &req, data));
278 }
279 
280 static int
281 kue_load_fw(struct kue_softc *sc)
282 {
283 	struct usb_device_descriptor *dd;
284 	uint16_t hwrev;
285 	usb_error_t err;
286 
287 	dd = usbd_get_device_descriptor(sc->sc_ue.ue_udev);
288 	hwrev = UGETW(dd->bcdDevice);
289 
290 	/*
291 	 * First, check if we even need to load the firmware.
292 	 * If the device was still attached when the system was
293 	 * rebooted, it may already have firmware loaded in it.
294 	 * If this is the case, we don't need to do it again.
295 	 * And in fact, if we try to load it again, we'll hang,
296 	 * so we have to avoid this condition if we don't want
297 	 * to look stupid.
298 	 *
299 	 * We can test this quickly by checking the bcdRevision
300 	 * code. The NIC will return a different revision code if
301 	 * it's probed while the firmware is still loaded and
302 	 * running.
303 	 */
304 	if (hwrev == 0x0202)
305 		return(0);
306 
307 	/* Load code segment */
308 	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
309 	    0, kue_code_seg, sizeof(kue_code_seg));
310 	if (err) {
311 		device_printf(sc->sc_ue.ue_dev, "failed to load code segment: %s\n",
312 		    usbd_errstr(err));
313 		return(ENXIO);
314 	}
315 
316 	/* Load fixup segment */
317 	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
318 	    0, kue_fix_seg, sizeof(kue_fix_seg));
319 	if (err) {
320 		device_printf(sc->sc_ue.ue_dev, "failed to load fixup segment: %s\n",
321 		    usbd_errstr(err));
322 		return(ENXIO);
323 	}
324 
325 	/* Send trigger command. */
326 	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
327 	    0, kue_trig_seg, sizeof(kue_trig_seg));
328 	if (err) {
329 		device_printf(sc->sc_ue.ue_dev, "failed to load trigger segment: %s\n",
330 		    usbd_errstr(err));
331 		return(ENXIO);
332 	}
333 
334 	return (0);
335 }
336 
337 static void
338 kue_setpromisc(struct usb_ether *ue)
339 {
340 	struct kue_softc *sc = uether_getsc(ue);
341 	struct ifnet *ifp = uether_getifp(ue);
342 
343 	KUE_LOCK_ASSERT(sc, MA_OWNED);
344 
345 	if (ifp->if_flags & IFF_PROMISC)
346 		sc->sc_rxfilt |= KUE_RXFILT_PROMISC;
347 	else
348 		sc->sc_rxfilt &= ~KUE_RXFILT_PROMISC;
349 
350 	kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
351 }
352 
353 static void
354 kue_setmulti(struct usb_ether *ue)
355 {
356 	struct kue_softc *sc = uether_getsc(ue);
357 	struct ifnet *ifp = uether_getifp(ue);
358 	struct ifmultiaddr *ifma;
359 	int i = 0;
360 
361 	KUE_LOCK_ASSERT(sc, MA_OWNED);
362 
363 	if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
364 		sc->sc_rxfilt |= KUE_RXFILT_ALLMULTI;
365 		sc->sc_rxfilt &= ~KUE_RXFILT_MULTICAST;
366 		kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
367 		return;
368 	}
369 
370 	sc->sc_rxfilt &= ~KUE_RXFILT_ALLMULTI;
371 
372 	if_maddr_rlock(ifp);
373 	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
374 	{
375 		if (ifma->ifma_addr->sa_family != AF_LINK)
376 			continue;
377 		/*
378 		 * If there are too many addresses for the
379 		 * internal filter, switch over to allmulti mode.
380 		 */
381 		if (i == KUE_MCFILTCNT(sc))
382 			break;
383 		memcpy(KUE_MCFILT(sc, i),
384 		    LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
385 		    ETHER_ADDR_LEN);
386 		i++;
387 	}
388 	if_maddr_runlock(ifp);
389 
390 	if (i == KUE_MCFILTCNT(sc))
391 		sc->sc_rxfilt |= KUE_RXFILT_ALLMULTI;
392 	else {
393 		sc->sc_rxfilt |= KUE_RXFILT_MULTICAST;
394 		kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SET_MCAST_FILTERS,
395 		    i, sc->sc_mcfilters, i * ETHER_ADDR_LEN);
396 	}
397 
398 	kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
399 }
400 
401 /*
402  * Issue a SET_CONFIGURATION command to reset the MAC. This should be
403  * done after the firmware is loaded into the adapter in order to
404  * bring it into proper operation.
405  */
406 static void
407 kue_reset(struct kue_softc *sc)
408 {
409 	struct usb_config_descriptor *cd;
410 	usb_error_t err;
411 
412 	cd = usbd_get_config_descriptor(sc->sc_ue.ue_udev);
413 
414 	err = usbd_req_set_config(sc->sc_ue.ue_udev, &sc->sc_mtx,
415 	    cd->bConfigurationValue);
416 	if (err)
417 		DPRINTF("reset failed (ignored)\n");
418 
419 	/* wait a little while for the chip to get its brains in order */
420 	uether_pause(&sc->sc_ue, hz / 100);
421 }
422 
423 static void
424 kue_attach_post(struct usb_ether *ue)
425 {
426 	struct kue_softc *sc = uether_getsc(ue);
427 	int error;
428 
429 	/* load the firmware into the NIC */
430 	error = kue_load_fw(sc);
431 	if (error) {
432 		device_printf(sc->sc_ue.ue_dev, "could not load firmware\n");
433 		/* ignore the error */
434 	}
435 
436 	/* reset the adapter */
437 	kue_reset(sc);
438 
439 	/* read ethernet descriptor */
440 	kue_ctl(sc, KUE_CTL_READ, KUE_CMD_GET_ETHER_DESCRIPTOR,
441 	    0, &sc->sc_desc, sizeof(sc->sc_desc));
442 
443 	/* copy in ethernet address */
444 	memcpy(ue->ue_eaddr, sc->sc_desc.kue_macaddr, sizeof(ue->ue_eaddr));
445 }
446 
447 /*
448  * Probe for a KLSI chip.
449  */
450 static int
451 kue_probe(device_t dev)
452 {
453 	struct usb_attach_arg *uaa = device_get_ivars(dev);
454 
455 	if (uaa->usb_mode != USB_MODE_HOST)
456 		return (ENXIO);
457 	if (uaa->info.bConfigIndex != KUE_CONFIG_IDX)
458 		return (ENXIO);
459 	if (uaa->info.bIfaceIndex != KUE_IFACE_IDX)
460 		return (ENXIO);
461 
462 	return (usbd_lookup_id_by_uaa(kue_devs, sizeof(kue_devs), uaa));
463 }
464 
465 /*
466  * Attach the interface. Allocate softc structures, do
467  * setup and ethernet/BPF attach.
468  */
469 static int
470 kue_attach(device_t dev)
471 {
472 	struct usb_attach_arg *uaa = device_get_ivars(dev);
473 	struct kue_softc *sc = device_get_softc(dev);
474 	struct usb_ether *ue = &sc->sc_ue;
475 	uint8_t iface_index;
476 	int error;
477 
478 	device_set_usb_desc(dev);
479 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
480 
481 	iface_index = KUE_IFACE_IDX;
482 	error = usbd_transfer_setup(uaa->device, &iface_index,
483 	    sc->sc_xfer, kue_config, KUE_N_TRANSFER, sc, &sc->sc_mtx);
484 	if (error) {
485 		device_printf(dev, "allocating USB transfers failed\n");
486 		goto detach;
487 	}
488 
489 	sc->sc_mcfilters = malloc(KUE_MCFILTCNT(sc) * ETHER_ADDR_LEN,
490 	    M_USBDEV, M_WAITOK);
491 	if (sc->sc_mcfilters == NULL) {
492 		device_printf(dev, "failed allocating USB memory\n");
493 		goto detach;
494 	}
495 
496 	ue->ue_sc = sc;
497 	ue->ue_dev = dev;
498 	ue->ue_udev = uaa->device;
499 	ue->ue_mtx = &sc->sc_mtx;
500 	ue->ue_methods = &kue_ue_methods;
501 
502 	error = uether_ifattach(ue);
503 	if (error) {
504 		device_printf(dev, "could not attach interface\n");
505 		goto detach;
506 	}
507 	return (0);			/* success */
508 
509 detach:
510 	kue_detach(dev);
511 	return (ENXIO);			/* failure */
512 }
513 
514 static int
515 kue_detach(device_t dev)
516 {
517 	struct kue_softc *sc = device_get_softc(dev);
518 	struct usb_ether *ue = &sc->sc_ue;
519 
520 	usbd_transfer_unsetup(sc->sc_xfer, KUE_N_TRANSFER);
521 	uether_ifdetach(ue);
522 	mtx_destroy(&sc->sc_mtx);
523 	free(sc->sc_mcfilters, M_USBDEV);
524 
525 	return (0);
526 }
527 
528 /*
529  * A frame has been uploaded: pass the resulting mbuf chain up to
530  * the higher level protocols.
531  */
532 static void
533 kue_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
534 {
535 	struct kue_softc *sc = usbd_xfer_softc(xfer);
536 	struct usb_ether *ue = &sc->sc_ue;
537 	struct ifnet *ifp = uether_getifp(ue);
538 	struct usb_page_cache *pc;
539 	uint8_t buf[2];
540 	int len;
541 	int actlen;
542 
543 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
544 
545 	switch (USB_GET_STATE(xfer)) {
546 	case USB_ST_TRANSFERRED:
547 
548 		if (actlen <= (2 + sizeof(struct ether_header))) {
549 			ifp->if_ierrors++;
550 			goto tr_setup;
551 		}
552 		pc = usbd_xfer_get_frame(xfer, 0);
553 		usbd_copy_out(pc, 0, buf, 2);
554 		actlen -= 2;
555 		len = buf[0] | (buf[1] << 8);
556 		len = min(actlen, len);
557 
558 		uether_rxbuf(ue, pc, 2, len);
559 		/* FALLTHROUGH */
560 	case USB_ST_SETUP:
561 tr_setup:
562 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
563 		usbd_transfer_submit(xfer);
564 		uether_rxflush(ue);
565 		return;
566 
567 	default:			/* Error */
568 		DPRINTF("bulk read error, %s\n",
569 		    usbd_errstr(error));
570 
571 		if (error != USB_ERR_CANCELLED) {
572 			/* try to clear stall first */
573 			usbd_xfer_set_stall(xfer);
574 			goto tr_setup;
575 		}
576 		return;
577 
578 	}
579 }
580 
581 static void
582 kue_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
583 {
584 	struct kue_softc *sc = usbd_xfer_softc(xfer);
585 	struct ifnet *ifp = uether_getifp(&sc->sc_ue);
586 	struct usb_page_cache *pc;
587 	struct mbuf *m;
588 	int total_len;
589 	int temp_len;
590 	uint8_t buf[2];
591 
592 	switch (USB_GET_STATE(xfer)) {
593 	case USB_ST_TRANSFERRED:
594 		DPRINTFN(11, "transfer complete\n");
595 		ifp->if_opackets++;
596 
597 		/* FALLTHROUGH */
598 	case USB_ST_SETUP:
599 tr_setup:
600 		IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
601 
602 		if (m == NULL)
603 			return;
604 		if (m->m_pkthdr.len > MCLBYTES)
605 			m->m_pkthdr.len = MCLBYTES;
606 		temp_len = (m->m_pkthdr.len + 2);
607 		total_len = (temp_len + (64 - (temp_len % 64)));
608 
609 		/* the first two bytes are the frame length */
610 
611 		buf[0] = (uint8_t)(m->m_pkthdr.len);
612 		buf[1] = (uint8_t)(m->m_pkthdr.len >> 8);
613 
614 		pc = usbd_xfer_get_frame(xfer, 0);
615 		usbd_copy_in(pc, 0, buf, 2);
616 		usbd_m_copy_in(pc, 2, m, 0, m->m_pkthdr.len);
617 
618 		usbd_frame_zero(pc, temp_len, total_len - temp_len);
619 		usbd_xfer_set_frame_len(xfer, 0, total_len);
620 
621 		/*
622 		 * if there's a BPF listener, bounce a copy
623 		 * of this frame to him:
624 		 */
625 		BPF_MTAP(ifp, m);
626 
627 		m_freem(m);
628 
629 		usbd_transfer_submit(xfer);
630 
631 		return;
632 
633 	default:			/* Error */
634 		DPRINTFN(11, "transfer error, %s\n",
635 		    usbd_errstr(error));
636 
637 		ifp->if_oerrors++;
638 
639 		if (error != USB_ERR_CANCELLED) {
640 			/* try to clear stall first */
641 			usbd_xfer_set_stall(xfer);
642 			goto tr_setup;
643 		}
644 		return;
645 
646 	}
647 }
648 
649 static void
650 kue_start(struct usb_ether *ue)
651 {
652 	struct kue_softc *sc = uether_getsc(ue);
653 
654 	/*
655 	 * start the USB transfers, if not already started:
656 	 */
657 	usbd_transfer_start(sc->sc_xfer[KUE_BULK_DT_RD]);
658 	usbd_transfer_start(sc->sc_xfer[KUE_BULK_DT_WR]);
659 }
660 
661 static void
662 kue_init(struct usb_ether *ue)
663 {
664 	struct kue_softc *sc = uether_getsc(ue);
665 	struct ifnet *ifp = uether_getifp(ue);
666 
667 	KUE_LOCK_ASSERT(sc, MA_OWNED);
668 
669 	/* set MAC address */
670 	kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SET_MAC,
671 	    0, IF_LLADDR(ifp), ETHER_ADDR_LEN);
672 
673 	/* I'm not sure how to tune these. */
674 #if 0
675 	/*
676 	 * Leave this one alone for now; setting it
677 	 * wrong causes lockups on some machines/controllers.
678 	 */
679 	kue_setword(sc, KUE_CMD_SET_SOFS, 1);
680 #endif
681 	kue_setword(sc, KUE_CMD_SET_URB_SIZE, 64);
682 
683 	/* load the multicast filter */
684 	kue_setpromisc(ue);
685 
686 	usbd_xfer_set_stall(sc->sc_xfer[KUE_BULK_DT_WR]);
687 
688 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
689 	kue_start(ue);
690 }
691 
692 static void
693 kue_stop(struct usb_ether *ue)
694 {
695 	struct kue_softc *sc = uether_getsc(ue);
696 	struct ifnet *ifp = uether_getifp(ue);
697 
698 	KUE_LOCK_ASSERT(sc, MA_OWNED);
699 
700 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
701 
702 	/*
703 	 * stop all the transfers, if not already stopped:
704 	 */
705 	usbd_transfer_stop(sc->sc_xfer[KUE_BULK_DT_WR]);
706 	usbd_transfer_stop(sc->sc_xfer[KUE_BULK_DT_RD]);
707 }
708