2 * Copyright (c) 1996-2000 Whistle Communications, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of author nor the names of its
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY NICK HIBMA AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
29 * $FreeBSD: src/sys/dev/usb/udbp.c,v 1.24 2003/08/24 17:55:55 obrien Exp $
30 * $DragonFly: src/sys/dev/usbmisc/udbp/Attic/udbp.c,v 1.14 2007/07/01 21:24:03 hasso Exp $
33 /* Driver for arbitrary double bulk pipe devices.
34 * The driver assumes that there will be the same driver on the other side.
36 * XXX Some more information on what the framing of the IP packets looks like.
38 * To take full advantage of bulk transmission, packets should be chosen
39 * between 1k and 5k in size (1k to make sure the sending side starts
40 * straming, and <5k to avoid overflowing the system with small TDs).
44 /* probe/attach/detach:
45 * Connect the driver to the hardware and netgraph
47 * udbp_setup_out_transfer(sc);
48 * Setup an outbound transfer. Only one transmit can be active at the same
50 * XXX If it is required that the driver is able to queue multiple requests
51 * let me know. That is slightly difficult, due to the fact that we
52 * cannot call usbd_alloc_xfer in int context.
54 * udbp_setup_in_transfer(sc)
55 * Prepare an in transfer that will be waiting for data to come in. It
56 * is submitted and sits there until data is available.
57 * The callback resubmits a new transfer on completion.
59 * The reason we submit a bulk in transfer is that USB does not know about
60 * interrupts. The bulk transfer continuously polls the device for data.
61 * While the device has no data available, the device NAKs the TDs. As soon
62 * as there is data, the transfer happens and the data comes flowing in.
64 * In case you were wondering, interrupt transfers happen exactly that way.
65 * It therefore doesn't make sense to use the interrupt pipe to signal
66 * 'data ready' and then schedule a bulk transfer to fetch it. That would
67 * incur a 2ms delay at least, without reducing bandwidth requirements.
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/kernel.h>
76 #include <sys/malloc.h>
77 #include <sys/module.h>
81 #include <sys/select.h>
84 #include <sys/socket.h>
85 #include <sys/ctype.h>
86 #include <sys/errno.h>
87 #include <sys/sysctl.h>
88 #include <sys/thread2.h>
92 #include <dev/usb/usb.h>
93 #include <dev/usb/usbdi.h>
94 #include <dev/usb/usbdi_util.h>
95 #include <dev/usb/usbdivar.h>
96 #include <dev/usb/usbhid.h>
98 #include <dev/usb/usbdevs.h>
101 #include <netgraph/ng_message.h>
102 #include <netgraph/ng_parse.h>
103 #include <dev/usb/udbp.h>
104 #include <netgraph/netgraph.h>
107 #define DPRINTF(x) if (udbpdebug) kprintf x
108 #define DPRINTFN(n,x) if (udbpdebug>(n)) kprintf x
110 SYSCTL_NODE(_hw_usb, OID_AUTO, udbp, CTLFLAG_RW, 0, "USB udbp");
111 SYSCTL_INT(_hw_usb_udbp, OID_AUTO, debug, CTLFLAG_RW,
112 &udbpdebug, 0, "udbp debug level");
115 #define DPRINTFN(n,x)
118 #define MS_TO_TICKS(ms) ((ms) * hz / 1000)
120 #define UDBP_TIMEOUT 2000 /* timeout on outbound transfers, in msecs */
121 #define UDBP_BUFFERSIZE 2048 /* maximum number of bytes in one transfer */
125 device_t sc_dev; /* base device */
126 usbd_interface_handle sc_iface;
128 usbd_pipe_handle sc_bulkin_pipe;
130 usbd_xfer_handle sc_bulkin_xfer;
131 void *sc_bulkin_buffer;
132 int sc_bulkin_bufferlen;
133 int sc_bulkin_datalen;
135 usbd_pipe_handle sc_bulkout_pipe;
137 usbd_xfer_handle sc_bulkout_xfer;
138 void *sc_bulkout_buffer;
139 int sc_bulkout_bufferlen;
140 int sc_bulkout_datalen;
143 # define DISCONNECTED 0x01
144 # define OUT_BUSY 0x02
145 # define NETGRAPH_INITIALISED 0x04
146 node_p node; /* back pointer to node */
147 hook_p hook; /* pointer to the hook */
148 u_int packets_in; /* packets in from downstream */
149 u_int packets_out; /* packets out towards downstream */
150 struct ifqueue xmitq_hipri; /* hi-priority transmit queue */
151 struct ifqueue xmitq; /* low-priority transmit queue */
154 typedef struct udbp_softc *udbp_p;
158 static ng_constructor_t ng_udbp_constructor;
159 static ng_rcvmsg_t ng_udbp_rcvmsg;
160 static ng_shutdown_t ng_udbp_rmnode;
161 static ng_newhook_t ng_udbp_newhook;
162 static ng_connect_t ng_udbp_connect;
163 static ng_rcvdata_t ng_udbp_rcvdata;
164 static ng_disconnect_t ng_udbp_disconnect;
166 /* Parse type for struct ngudbpstat */
167 static const struct ng_parse_struct_field
168 ng_udbp_stat_type_fields[] = NG_UDBP_STATS_TYPE_INFO;
169 static const struct ng_parse_type ng_udbp_stat_type = {
170 &ng_parse_struct_type,
171 &ng_udbp_stat_type_fields
174 /* List of commands and how to convert arguments to/from ASCII */
175 static const struct ng_cmdlist ng_udbp_cmdlist[] = {
187 &ng_parse_int32_type,
193 /* Netgraph node type descriptor */
194 static struct ng_type ng_udbp_typestruct = {
209 static int udbp_setup_in_transfer (udbp_p sc);
210 static void udbp_in_transfer_cb (usbd_xfer_handle xfer,
211 usbd_private_handle priv,
214 static int udbp_setup_out_transfer (udbp_p sc);
215 static void udbp_out_transfer_cb (usbd_xfer_handle xfer,
216 usbd_private_handle priv,
219 USB_DECLARE_DRIVER(udbp);
222 udbp_match(device_t self)
224 struct usb_attach_arg *uaa = device_get_ivars(self);
225 usb_interface_descriptor_t *id;
227 return (UMATCH_NONE);
228 id = usbd_get_interface_descriptor(uaa->iface);
230 /* XXX Julian, add the id of the device if you have one to test
231 * things with. run 'usbdevs -v' and note the 3 ID's that appear.
232 * The Vendor Id and Product Id are in hex and the Revision Id is in
233 * bcd. But as usual if the revision is 0x101 then you should compare
234 * the revision id in the device descriptor with 0x101
235 * Or go search the file usbdevs.h. Maybe the device is already in
238 if ((uaa->vendor == USB_VENDOR_NETCHIP &&
239 uaa->product == USB_PRODUCT_NETCHIP_TURBOCONNECT))
240 return(UMATCH_VENDOR_PRODUCT);
242 if ((uaa->vendor == USB_VENDOR_PROLIFIC &&
243 (uaa->product == USB_PRODUCT_PROLIFIC_PL2301 ||
244 uaa->product == USB_PRODUCT_PROLIFIC_PL2302)))
245 return(UMATCH_VENDOR_PRODUCT);
247 if ((uaa->vendor == USB_VENDOR_ANCHOR &&
248 uaa->product == USB_PRODUCT_ANCHOR_EZLINK))
249 return(UMATCH_VENDOR_PRODUCT);
251 return (UMATCH_NONE);
255 udbp_attach(device_t self)
257 struct udbp_softc *sc = device_get_softc(self);
258 struct usb_attach_arg *uaa = device_get_ivars(self);
259 usbd_interface_handle iface = uaa->iface;
260 usb_interface_descriptor_t *id;
261 usb_endpoint_descriptor_t *ed, *ed_bulkin = NULL, *ed_bulkout = NULL;
265 static int ngudbp_done_init=0;
267 sc->flags |= DISCONNECTED;
268 /* fetch the interface handle for the first interface */
269 (void) usbd_device2interface_handle(uaa->device, 0, &iface);
270 id = usbd_get_interface_descriptor(iface);
271 usbd_devinfo(uaa->device, 0, devinfo);
273 device_set_desc_copy(self, devinfo);
274 kprintf("%s: %s, iclass %d/%d\n", device_get_nameunit(sc->sc_dev),
275 devinfo, id->bInterfaceClass, id->bInterfaceSubClass);
277 /* Find the two first bulk endpoints */
278 for (i = 0 ; i < id->bNumEndpoints; i++) {
279 ed = usbd_interface2endpoint_descriptor(iface, i);
281 kprintf("%s: could not read endpoint descriptor\n",
282 device_get_nameunit(sc->sc_dev));
286 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN
287 && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
289 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT
290 && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
294 if (ed_bulkin && ed_bulkout) /* found all we need */
298 /* Verify that we goething sensible */
299 if (ed_bulkin == NULL || ed_bulkout == NULL) {
300 kprintf("%s: bulk-in and/or bulk-out endpoint not found\n",
301 device_get_nameunit(sc->sc_dev));
305 if (ed_bulkin->wMaxPacketSize[0] != ed_bulkout->wMaxPacketSize[0] ||
306 ed_bulkin->wMaxPacketSize[1] != ed_bulkout->wMaxPacketSize[1]) {
307 kprintf("%s: bulk-in and bulk-out have different packet sizes %d %d %d %d\n",
308 device_get_nameunit(sc->sc_dev),
309 ed_bulkin->wMaxPacketSize[0],
310 ed_bulkout->wMaxPacketSize[0],
311 ed_bulkin->wMaxPacketSize[1],
312 ed_bulkout->wMaxPacketSize[1]);
316 sc->sc_bulkin = ed_bulkin->bEndpointAddress;
317 sc->sc_bulkout = ed_bulkout->bEndpointAddress;
319 DPRINTF(("%s: Bulk-in: 0x%02x, bulk-out 0x%02x, packet size = %d\n",
320 device_get_nameunit(sc->sc_dev), sc->sc_bulkin, sc->sc_bulkout,
321 ed_bulkin->wMaxPacketSize[0]));
323 /* Allocate the in transfer struct */
324 sc->sc_bulkin_xfer = usbd_alloc_xfer(uaa->device);
325 if (!sc->sc_bulkin_xfer) {
328 sc->sc_bulkout_xfer = usbd_alloc_xfer(uaa->device);
329 if (!sc->sc_bulkout_xfer) {
332 sc->sc_bulkin_buffer = kmalloc(UDBP_BUFFERSIZE, M_USBDEV, M_INTWAIT);
333 if (!sc->sc_bulkin_buffer) {
336 sc->sc_bulkout_buffer = kmalloc(UDBP_BUFFERSIZE, M_USBDEV, M_INTWAIT);
337 if (!sc->sc_bulkout_xfer || !sc->sc_bulkout_buffer) {
340 sc->sc_bulkin_bufferlen = UDBP_BUFFERSIZE;
341 sc->sc_bulkout_bufferlen = UDBP_BUFFERSIZE;
343 /* We have decided on which endpoints to use, now open the pipes */
344 err = usbd_open_pipe(iface, sc->sc_bulkin,
345 USBD_EXCLUSIVE_USE, &sc->sc_bulkin_pipe);
347 kprintf("%s: cannot open bulk-in pipe (addr %d)\n",
348 device_get_nameunit(sc->sc_dev), sc->sc_bulkin);
351 err = usbd_open_pipe(iface, sc->sc_bulkout,
352 USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
354 kprintf("%s: cannot open bulk-out pipe (addr %d)\n",
355 device_get_nameunit(sc->sc_dev), sc->sc_bulkout);
359 if (!ngudbp_done_init){
361 if (ng_newtype(&ng_udbp_typestruct)) {
362 kprintf("ngudbp install failed\n");
367 if ((err = ng_make_node_common(&ng_udbp_typestruct, &sc->node)) == 0) {
369 ksprintf(nodename, "%s", device_get_nameunit(sc->sc_dev));
370 if ((err = ng_name_node(sc->node, nodename))) {
371 NG_NODE_UNREF(sc->node);
375 NG_NODE_SET_PRIVATE(sc->node, sc);
376 sc->xmitq.ifq_maxlen = IFQ_MAXLEN;
377 sc->xmitq_hipri.ifq_maxlen = IFQ_MAXLEN;
378 mtx_init(&sc->xmitq.ifq_mtx, "usb_xmitq", NULL,
380 mtx_init(&sc->xmitq_hipri.ifq_mtx,
381 "usb_xmitq_hipri", NULL, MTX_DEF);
384 sc->flags = NETGRAPH_INITIALISED;
385 /* sc->flags &= ~DISCONNECTED; */ /* XXX */
388 /* the device is now operational */
391 /* schedule the first incoming xfer */
392 err = udbp_setup_in_transfer(sc);
398 #if 0 /* probably done in udbp_detach() */
399 if (sc->sc_bulkout_buffer) {
400 FREE(sc->sc_bulkout_buffer, M_USBDEV);
402 if (sc->sc_bulkin_buffer) {
403 FREE(sc->sc_bulkin_buffer, M_USBDEV);
405 if (sc->sc_bulkout_xfer) {
406 usbd_free_xfer(sc->sc_bulkout_xfer);
408 if (sc->sc_bulkin_xfer) {
409 usbd_free_xfer(sc->sc_bulkin_xfer);
418 udbp_detach(device_t self)
420 struct udbp_softc *sc = device_get_softc(self);
422 sc->flags |= DISCONNECTED;
424 DPRINTF(("%s: disconnected\n", device_get_nameunit(self)));
426 if (sc->sc_bulkin_pipe) {
427 usbd_abort_pipe(sc->sc_bulkin_pipe);
428 usbd_close_pipe(sc->sc_bulkin_pipe);
430 if (sc->sc_bulkout_pipe) {
431 usbd_abort_pipe(sc->sc_bulkout_pipe);
432 usbd_close_pipe(sc->sc_bulkout_pipe);
435 if (sc->flags & NETGRAPH_INITIALISED) {
436 ng_rmnode_self(sc->node);
437 NG_NODE_SET_PRIVATE(sc->node, NULL);
438 NG_NODE_UNREF(sc->node);
439 sc->node = NULL; /* Paranoid */
442 if (sc->sc_bulkin_xfer)
443 usbd_free_xfer(sc->sc_bulkin_xfer);
444 if (sc->sc_bulkout_xfer)
445 usbd_free_xfer(sc->sc_bulkout_xfer);
447 if (sc->sc_bulkin_buffer)
448 kfree(sc->sc_bulkin_buffer, M_USBDEV);
449 if (sc->sc_bulkout_buffer)
450 kfree(sc->sc_bulkout_buffer, M_USBDEV);
456 udbp_setup_in_transfer(udbp_p sc)
458 void *priv = sc; /* XXX this should probably be some pointer to
459 * struct describing the transfer (mbuf?)
465 * How should we arrange for 2 extra bytes at the start of the
469 /* Initialise a USB transfer and then schedule it */
471 (void) usbd_setup_xfer( sc->sc_bulkin_xfer,
474 sc->sc_bulkin_buffer,
475 sc->sc_bulkin_bufferlen,
478 udbp_in_transfer_cb);
480 err = usbd_transfer(sc->sc_bulkin_xfer);
481 if (err && err != USBD_IN_PROGRESS) {
482 DPRINTF(("%s: failed to setup in-transfer, %s\n",
483 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
487 return (USBD_NORMAL_COMPLETION);
491 udbp_in_transfer_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
494 udbp_p sc = priv; /* XXX see priv above */
500 if (err != USBD_CANCELLED) {
501 DPRINTF(("%s: bulk-out transfer failed: %s\n",
502 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
504 /* USBD_CANCELLED happens at unload of the driver */
508 /* Transfer has failed, packet is not received */
515 /* get packet from device and send on */
516 m = m_devget(sc->sc_bulkin_buffer, len, 0, NULL, NULL);
517 NG_SEND_DATA_ONLY(err, sc->hook, m);
522 /* schedule the next in transfer */
523 udbp_setup_in_transfer(sc);
528 udbp_setup_out_transfer(udbp_p sc)
530 void *priv = sc; /* XXX this should probably be some pointer to
531 * struct describing the transfer (mbuf?)
539 if (sc->flags & OUT_BUSY)
540 panic("out transfer already in use, we should add queuing");
541 sc->flags |= OUT_BUSY;
544 IF_DEQUEUE(&sc->xmitq_hipri, m);
546 IF_DEQUEUE(&sc->xmitq, m);
551 sc->flags &= ~OUT_BUSY;
552 return (USBD_NORMAL_COMPLETION);
555 pktlen = m->m_pkthdr.len;
556 if (pktlen > sc->sc_bulkout_bufferlen) {
557 kprintf("%s: Packet too large, %d > %d\n",
558 device_get_nameunit(sc->sc_dev), pktlen,
559 sc->sc_bulkout_bufferlen);
560 return (USBD_IOERROR);
563 m_copydata(m, 0, pktlen, sc->sc_bulkout_buffer);
566 /* Initialise a USB transfer and then schedule it */
568 (void) usbd_setup_xfer( sc->sc_bulkout_xfer,
571 sc->sc_bulkout_buffer,
575 udbp_out_transfer_cb);
577 err = usbd_transfer(sc->sc_bulkout_xfer);
578 if (err && err != USBD_IN_PROGRESS) {
579 DPRINTF(("%s: failed to setup out-transfer, %s\n",
580 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
584 return (USBD_NORMAL_COMPLETION);
588 udbp_out_transfer_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
591 udbp_p sc = priv; /* XXX see priv above */
594 DPRINTF(("%s: bulk-out transfer failed: %s\n",
595 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
596 /* Transfer has failed, packet is not transmitted */
597 /* XXX Invalidate packet */
601 /* packet has been transmitted */
604 sc->flags &= ~OUT_BUSY;
605 udbp_setup_out_transfer(sc);
609 DRIVER_MODULE(udbp, uhub, udbp_driver, udbp_devclass, usbd_driver_load, 0);
610 MODULE_DEPEND(udbp, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
613 /***********************************************************************
614 * Start of Netgraph methods
615 **********************************************************************/
618 * If this is a device node so this work is done in the attach()
619 * routine and the constructor will return EINVAL as you should not be able
620 * to create nodes that depend on hardware (unless you can add the hardware :)
623 ng_udbp_constructor(node_p node)
629 * Give our ok for a hook to be added...
630 * If we are not running this might kick a device into life.
631 * Possibly decode information out of the hook name.
632 * Add the hook's private info to the hook structure.
633 * (if we had some). In this example, we assume that there is a
634 * an array of structs, called 'channel' in the private info,
635 * one for each active channel. The private
636 * pointer of each hook points to the appropriate UDBP_hookinfo struct
637 * so that the source of an input packet is easily identified.
640 ng_udbp_newhook(node_p node, hook_p hook, const char *name)
642 const udbp_p sc = NG_NODE_PRIVATE(node);
645 /* Possibly start up the device if it's not already going */
646 if ((sc->flags & SCF_RUNNING) == 0) {
647 ng_udbp_start_hardware(sc);
651 if (strcmp(name, NG_UDBP_HOOK_NAME) == 0) {
653 NG_HOOK_SET_PRIVATE(hook, NULL);
655 return (EINVAL); /* not a hook we know about */
661 * Get a netgraph control message.
662 * Check it is one we understand. If needed, send a response.
663 * We could save the address for an async action later, but don't here.
664 * Always free the message.
665 * The response should be in a malloc'd region that the caller can 'free'.
666 * A response is not required.
667 * Theoretically you could respond defferently to old message types if
668 * the cookie in the header didn't match what we consider to be current
669 * (so that old userland programs could continue to work).
672 ng_udbp_rcvmsg(node_p node, item_p item, hook_p lasthook)
674 const udbp_p sc = NG_NODE_PRIVATE(node);
675 struct ng_mesg *resp = NULL;
679 NGI_GET_MSG(item, msg);
680 /* Deal with message according to cookie and command */
681 switch (msg->header.typecookie) {
682 case NGM_UDBP_COOKIE:
683 switch (msg->header.cmd) {
684 case NGM_UDBP_GET_STATUS:
686 struct ngudbpstat *stats;
688 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
693 stats = (struct ngudbpstat *) resp->data;
694 stats->packets_in = sc->packets_in;
695 stats->packets_out = sc->packets_out;
698 case NGM_UDBP_SET_FLAG:
699 if (msg->header.arglen != sizeof(u_int32_t)) {
703 sc->flags = *((u_int32_t *) msg->data);
706 error = EINVAL; /* unknown command */
711 error = EINVAL; /* unknown cookie type */
715 /* Take care of synchronous response, if any */
716 NG_RESPOND_MSG(error, node, item, resp);
722 * Accept data from the hook and queue it for output.
725 ng_udbp_rcvdata(hook_p hook, item_p item)
727 const udbp_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
729 struct ifqueue *xmitq_p;
734 NGI_GET_META(item, meta);
737 * Now queue the data for when it can be sent
739 if (meta && meta->priority > 0) {
740 xmitq_p = (&sc->xmitq_hipri);
742 xmitq_p = (&sc->xmitq);
745 if (IF_QFULL(xmitq_p)) {
751 IF_ENQUEUE(xmitq_p, m);
752 if (!(sc->flags & OUT_BUSY))
753 udbp_setup_out_transfer(sc);
758 * It was an error case.
759 * check if we need to free the mbuf, and then return the error
767 * Do local shutdown processing..
768 * We are a persistant device, we refuse to go away, and
769 * only remove our links and reset ourself.
772 ng_udbp_rmnode(node_p node)
774 const udbp_p sc = NG_NODE_PRIVATE(node);
777 if (sc->flags & DISCONNECTED) {
779 * WE are really going away.. hardware must have gone.
780 * Assume that the hardware drive part will clear up the
781 * sc, in fact it may already have done so..
782 * In which case we may have just segfaulted..XXX
787 /* stolen from attach routine */
788 /* Drain the queues */
789 IF_DRAIN(&sc->xmitq_hipri);
790 IF_DRAIN(&sc->xmitq);
792 sc->packets_in = 0; /* reset stats */
794 NG_NODE_UNREF(node); /* forget it ever existed */
796 if ((err = ng_make_node_common(&ng_udbp_typestruct, &sc->node)) == 0) {
798 ksprintf(nodename, "%s", device_get_nameunit(sc->sc_dev));
799 if ((err = ng_name_node(sc->node, nodename))) {
800 NG_NODE_UNREF(sc->node); /* out damned spot! */
801 sc->flags &= ~NETGRAPH_INITIALISED;
804 NG_NODE_SET_PRIVATE(sc->node, sc);
811 * This is called once we've already connected a new hook to the other node.
812 * It gives us a chance to balk at the last minute.
815 ng_udbp_connect(hook_p hook)
817 /* probably not at splnet, force outward queueing */
818 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
819 /* be really amiable and just say "YUP that's OK by me! " */
826 * For this type, removal of the last link destroys the node
829 ng_udbp_disconnect(hook_p hook)
831 const udbp_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
834 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
835 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
836 ng_rmnode_self(NG_HOOK_NODE(hook));