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.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 /* Driver for arbitrary double bulk pipe devices.
35 * The driver assumes that there will be the same driver on the other side.
37 * XXX Some more information on what the framing of the IP packets looks like.
39 * To take full advantage of bulk transmission, packets should be chosen
40 * between 1k and 5k in size (1k to make sure the sending side starts
41 * straming, and <5k to avoid overflowing the system with small TDs).
45 /* probe/attach/detach:
46 * Connect the driver to the hardware and netgraph
48 * udbp_setup_out_transfer(sc);
49 * Setup an outbound transfer. Only one transmit can be active at the same
51 * XXX If it is required that the driver is able to queue multiple requests
52 * let me know. That is slightly difficult, due to the fact that we
53 * cannot call usbd_alloc_xfer in int context.
55 * udbp_setup_in_transfer(sc)
56 * Prepare an in transfer that will be waiting for data to come in. It
57 * is submitted and sits there until data is available.
58 * The callback resubmits a new transfer on completion.
60 * The reason we submit a bulk in transfer is that USB does not know about
61 * interrupts. The bulk transfer continuously polls the device for data.
62 * While the device has no data available, the device NAKs the TDs. As soon
63 * as there is data, the transfer happens and the data comes flowing in.
65 * In case you were wondering, interrupt transfers happen exactly that way.
66 * It therefore doesn't make sense to use the interrupt pipe to signal
67 * 'data ready' and then schedule a bulk transfer to fetch it. That would
68 * incur a 2ms delay at least, without reducing bandwidth requirements.
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/kernel.h>
77 #include <sys/malloc.h>
78 #include <sys/module.h>
82 #include <sys/selinfo.h>
85 #include <sys/socket.h>
86 #include <sys/ctype.h>
87 #include <sys/errno.h>
88 #include <sys/sysctl.h>
90 #include <machine/bus.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>
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) printf x
108 #define DPRINTFN(n,x) if (udbpdebug>(n)) printf 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 = {
195 .version = NG_ABI_VERSION,
196 .name = NG_UDBP_NODE_TYPE,
197 .constructor = ng_udbp_constructor,
198 .rcvmsg = ng_udbp_rcvmsg,
199 .shutdown = ng_udbp_rmnode,
200 .newhook = ng_udbp_newhook,
201 .connect = ng_udbp_connect,
202 .rcvdata = ng_udbp_rcvdata,
203 .disconnect = ng_udbp_disconnect,
204 .cmdlist = ng_udbp_cmdlist,
207 static int udbp_setup_in_transfer (udbp_p sc);
208 static void udbp_in_transfer_cb (usbd_xfer_handle xfer,
209 usbd_private_handle priv,
212 static int udbp_setup_out_transfer (udbp_p sc);
213 static void udbp_out_transfer_cb (usbd_xfer_handle xfer,
214 usbd_private_handle priv,
217 static device_probe_t udbp_match;
218 static device_attach_t udbp_attach;
219 static device_detach_t udbp_detach;
221 static device_method_t udbp_methods[] = {
222 /* Device interface */
223 DEVMETHOD(device_probe, udbp_match),
224 DEVMETHOD(device_attach, udbp_attach),
225 DEVMETHOD(device_detach, udbp_detach),
230 static driver_t udbp_driver = {
233 sizeof(struct udbp_softc)
236 static devclass_t udbp_devclass;
239 udbp_match(device_t self)
241 struct usb_attach_arg *uaa = device_get_ivars(self);
242 usb_interface_descriptor_t *id;
244 return (UMATCH_NONE);
245 id = usbd_get_interface_descriptor(uaa->iface);
247 /* XXX Julian, add the id of the device if you have one to test
248 * things with. run 'usbdevs -v' and note the 3 ID's that appear.
249 * The Vendor Id and Product Id are in hex and the Revision Id is in
250 * bcd. But as usual if the revision is 0x101 then you should compare
251 * the revision id in the device descriptor with 0x101
252 * Or go search the file usbdevs.h. Maybe the device is already in
255 if ((uaa->vendor == USB_VENDOR_NETCHIP &&
256 uaa->product == USB_PRODUCT_NETCHIP_TURBOCONNECT))
257 return (UMATCH_VENDOR_PRODUCT);
259 if ((uaa->vendor == USB_VENDOR_PROLIFIC &&
260 (uaa->product == USB_PRODUCT_PROLIFIC_PL2301 ||
261 uaa->product == USB_PRODUCT_PROLIFIC_PL2302)))
262 return (UMATCH_VENDOR_PRODUCT);
264 if ((uaa->vendor == USB_VENDOR_ANCHOR &&
265 uaa->product == USB_PRODUCT_ANCHOR_EZLINK))
266 return (UMATCH_VENDOR_PRODUCT);
268 if ((uaa->vendor == USB_VENDOR_GENESYS &&
269 uaa->product == USB_PRODUCT_GENESYS_GL620USB))
270 return (UMATCH_VENDOR_PRODUCT);
272 return (UMATCH_NONE);
276 udbp_attach(device_t self)
278 struct udbp_softc *sc = device_get_softc(self);
279 struct usb_attach_arg *uaa = device_get_ivars(self);
280 usbd_interface_handle iface = uaa->iface;
281 usb_interface_descriptor_t *id;
282 usb_endpoint_descriptor_t *ed, *ed_bulkin = NULL, *ed_bulkout = NULL;
285 static int ngudbp_done_init=0;
287 sc->flags |= DISCONNECTED;
288 /* fetch the interface handle for the first interface */
289 (void) usbd_device2interface_handle(uaa->device, 0, &iface);
290 id = usbd_get_interface_descriptor(iface);
293 /* Find the two first bulk endpoints */
294 for (i = 0 ; i < id->bNumEndpoints; i++) {
295 ed = usbd_interface2endpoint_descriptor(iface, i);
297 device_printf(self, "could not read endpoint descriptor\n");
301 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN
302 && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
304 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT
305 && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
309 if (ed_bulkin && ed_bulkout) /* found all we need */
313 /* Verify that we goething sensible */
314 if (ed_bulkin == NULL || ed_bulkout == NULL) {
315 device_printf(self, "bulk-in and/or bulk-out endpoint not found\n");
319 if (ed_bulkin->wMaxPacketSize[0] != ed_bulkout->wMaxPacketSize[0] ||
320 ed_bulkin->wMaxPacketSize[1] != ed_bulkout->wMaxPacketSize[1]) {
322 "bulk-in and bulk-out have different packet sizes %d %d %d %d\n",
323 ed_bulkin->wMaxPacketSize[0],
324 ed_bulkout->wMaxPacketSize[0],
325 ed_bulkin->wMaxPacketSize[1],
326 ed_bulkout->wMaxPacketSize[1]);
330 sc->sc_bulkin = ed_bulkin->bEndpointAddress;
331 sc->sc_bulkout = ed_bulkout->bEndpointAddress;
333 DPRINTF(("%s: Bulk-in: 0x%02x, bulk-out 0x%02x, packet size = %d\n",
334 device_get_nameunit(sc->sc_dev), sc->sc_bulkin, sc->sc_bulkout,
335 ed_bulkin->wMaxPacketSize[0]));
337 /* Allocate the in transfer struct */
338 sc->sc_bulkin_xfer = usbd_alloc_xfer(uaa->device);
339 if (!sc->sc_bulkin_xfer) {
342 sc->sc_bulkout_xfer = usbd_alloc_xfer(uaa->device);
343 if (!sc->sc_bulkout_xfer) {
346 sc->sc_bulkin_buffer = malloc(UDBP_BUFFERSIZE, M_USBDEV, M_WAITOK);
347 if (!sc->sc_bulkin_buffer) {
350 sc->sc_bulkout_buffer = malloc(UDBP_BUFFERSIZE, M_USBDEV, M_WAITOK);
351 if (!sc->sc_bulkout_xfer || !sc->sc_bulkout_buffer) {
354 sc->sc_bulkin_bufferlen = UDBP_BUFFERSIZE;
355 sc->sc_bulkout_bufferlen = UDBP_BUFFERSIZE;
357 /* We have decided on which endpoints to use, now open the pipes */
358 err = usbd_open_pipe(iface, sc->sc_bulkin,
359 USBD_EXCLUSIVE_USE, &sc->sc_bulkin_pipe);
361 device_printf(self, "cannot open bulk-in pipe (addr %d)\n",
365 err = usbd_open_pipe(iface, sc->sc_bulkout,
366 USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
368 device_printf(self, "cannot open bulk-out pipe (addr %d)\n",
373 if (!ngudbp_done_init){
375 if (ng_newtype(&ng_udbp_typestruct)) {
376 printf("ngudbp install failed\n");
381 if ((err = ng_make_node_common(&ng_udbp_typestruct, &sc->node)) == 0) {
383 sprintf(nodename, "%s", device_get_nameunit(sc->sc_dev));
384 if ((err = ng_name_node(sc->node, nodename))) {
385 NG_NODE_UNREF(sc->node);
389 NG_NODE_SET_PRIVATE(sc->node, sc);
390 sc->xmitq.ifq_maxlen = IFQ_MAXLEN;
391 sc->xmitq_hipri.ifq_maxlen = IFQ_MAXLEN;
392 mtx_init(&sc->xmitq.ifq_mtx, "usb_xmitq", NULL,
394 mtx_init(&sc->xmitq_hipri.ifq_mtx,
395 "usb_xmitq_hipri", NULL, MTX_DEF);
398 sc->flags = NETGRAPH_INITIALISED;
399 /* sc->flags &= ~DISCONNECTED; */ /* XXX */
402 /* the device is now operational */
405 /* schedule the first incoming xfer */
406 err = udbp_setup_in_transfer(sc);
412 #if 0 /* probably done in udbp_detach() */
413 if (sc->sc_bulkout_buffer) {
414 FREE(sc->sc_bulkout_buffer, M_USBDEV);
416 if (sc->sc_bulkin_buffer) {
417 FREE(sc->sc_bulkin_buffer, M_USBDEV);
419 if (sc->sc_bulkout_xfer) {
420 usbd_free_xfer(sc->sc_bulkout_xfer);
422 if (sc->sc_bulkin_xfer) {
423 usbd_free_xfer(sc->sc_bulkin_xfer);
432 udbp_detach(device_t self)
434 struct udbp_softc *sc = device_get_softc(self);
436 sc->flags |= DISCONNECTED;
438 DPRINTF(("%s: disconnected\n", device_get_nameunit(self)));
440 if (sc->sc_bulkin_pipe) {
441 usbd_abort_pipe(sc->sc_bulkin_pipe);
442 usbd_close_pipe(sc->sc_bulkin_pipe);
444 if (sc->sc_bulkout_pipe) {
445 usbd_abort_pipe(sc->sc_bulkout_pipe);
446 usbd_close_pipe(sc->sc_bulkout_pipe);
449 if (sc->flags & NETGRAPH_INITIALISED) {
450 ng_rmnode_self(sc->node);
451 NG_NODE_SET_PRIVATE(sc->node, NULL);
452 NG_NODE_UNREF(sc->node);
453 sc->node = NULL; /* Paranoid */
456 if (sc->sc_bulkin_xfer)
457 usbd_free_xfer(sc->sc_bulkin_xfer);
458 if (sc->sc_bulkout_xfer)
459 usbd_free_xfer(sc->sc_bulkout_xfer);
461 if (sc->sc_bulkin_buffer)
462 free(sc->sc_bulkin_buffer, M_USBDEV);
463 if (sc->sc_bulkout_buffer)
464 free(sc->sc_bulkout_buffer, M_USBDEV);
470 udbp_setup_in_transfer(udbp_p sc)
472 void *priv = sc; /* XXX this should probably be some pointer to
473 * struct describing the transfer (mbuf?)
479 * How should we arrange for 2 extra bytes at the start of the
483 /* Initialise a USB transfer and then schedule it */
485 (void) usbd_setup_xfer( sc->sc_bulkin_xfer,
488 sc->sc_bulkin_buffer,
489 sc->sc_bulkin_bufferlen,
492 udbp_in_transfer_cb);
494 err = usbd_transfer(sc->sc_bulkin_xfer);
495 if (err && err != USBD_IN_PROGRESS) {
496 DPRINTF(("%s: failed to setup in-transfer, %s\n",
497 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
501 return (USBD_NORMAL_COMPLETION);
505 udbp_in_transfer_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
508 udbp_p sc = priv; /* XXX see priv above */
514 if (err != USBD_CANCELLED) {
515 DPRINTF(("%s: bulk-out transfer failed: %s\n",
516 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
518 /* USBD_CANCELLED happens at unload of the driver */
522 /* Transfer has failed, packet is not received */
527 s = splimp(); /* block network stuff too */
529 /* get packet from device and send on */
530 m = m_devget(sc->sc_bulkin_buffer, len, 0, NULL, NULL);
531 NG_SEND_DATA_ONLY(err, sc->hook, m);
536 /* schedule the next in transfer */
537 udbp_setup_in_transfer(sc);
542 udbp_setup_out_transfer(udbp_p sc)
544 void *priv = sc; /* XXX this should probably be some pointer to
545 * struct describing the transfer (mbuf?)
555 if (sc->flags & OUT_BUSY)
556 panic("out transfer already in use, we should add queuing");
557 sc->flags |= OUT_BUSY;
559 s1 = splimp(); /* Queueing happens at splnet */
560 IF_DEQUEUE(&sc->xmitq_hipri, m);
562 IF_DEQUEUE(&sc->xmitq, m);
567 sc->flags &= ~OUT_BUSY;
568 return (USBD_NORMAL_COMPLETION);
571 pktlen = m->m_pkthdr.len;
572 if (pktlen > sc->sc_bulkout_bufferlen) {
573 device_printf(sc->sc_dev, "Packet too large, %d > %d\n",
574 pktlen, sc->sc_bulkout_bufferlen);
575 return (USBD_IOERROR);
578 m_copydata(m, 0, pktlen, sc->sc_bulkout_buffer);
581 /* Initialise a USB transfer and then schedule it */
583 (void) usbd_setup_xfer( sc->sc_bulkout_xfer,
586 sc->sc_bulkout_buffer,
590 udbp_out_transfer_cb);
592 err = usbd_transfer(sc->sc_bulkout_xfer);
593 if (err && err != USBD_IN_PROGRESS) {
594 DPRINTF(("%s: failed to setup out-transfer, %s\n",
595 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
599 return (USBD_NORMAL_COMPLETION);
603 udbp_out_transfer_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
606 udbp_p sc = priv; /* XXX see priv above */
610 DPRINTF(("%s: bulk-out transfer failed: %s\n",
611 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
612 /* Transfer has failed, packet is not transmitted */
613 /* XXX Invalidate packet */
617 /* packet has been transmitted */
619 s = splusb(); /* mark the buffer available */
620 sc->flags &= ~OUT_BUSY;
621 udbp_setup_out_transfer(sc);
625 DRIVER_MODULE(udbp, uhub, udbp_driver, udbp_devclass, usbd_driver_load, 0);
626 MODULE_DEPEND(udbp, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
627 MODULE_DEPEND(udbp, usb, 1, 1, 1);
630 /***********************************************************************
631 * Start of Netgraph methods
632 **********************************************************************/
635 * If this is a device node so this work is done in the attach()
636 * routine and the constructor will return EINVAL as you should not be able
637 * to create nodes that depend on hardware (unless you can add the hardware :)
640 ng_udbp_constructor(node_p node)
646 * Give our ok for a hook to be added...
647 * If we are not running this might kick a device into life.
648 * Possibly decode information out of the hook name.
649 * Add the hook's private info to the hook structure.
650 * (if we had some). In this example, we assume that there is a
651 * an array of structs, called 'channel' in the private info,
652 * one for each active channel. The private
653 * pointer of each hook points to the appropriate UDBP_hookinfo struct
654 * so that the source of an input packet is easily identified.
657 ng_udbp_newhook(node_p node, hook_p hook, const char *name)
659 const udbp_p sc = NG_NODE_PRIVATE(node);
662 /* Possibly start up the device if it's not already going */
663 if ((sc->flags & SCF_RUNNING) == 0) {
664 ng_udbp_start_hardware(sc);
668 if (strcmp(name, NG_UDBP_HOOK_NAME) == 0) {
670 NG_HOOK_SET_PRIVATE(hook, NULL);
672 return (EINVAL); /* not a hook we know about */
678 * Get a netgraph control message.
679 * Check it is one we understand. If needed, send a response.
680 * We could save the address for an async action later, but don't here.
681 * Always free the message.
682 * The response should be in a malloc'd region that the caller can 'free'.
683 * A response is not required.
684 * Theoretically you could respond defferently to old message types if
685 * the cookie in the header didn't match what we consider to be current
686 * (so that old userland programs could continue to work).
689 ng_udbp_rcvmsg(node_p node, item_p item, hook_p lasthook)
691 const udbp_p sc = NG_NODE_PRIVATE(node);
692 struct ng_mesg *resp = NULL;
696 NGI_GET_MSG(item, msg);
697 /* Deal with message according to cookie and command */
698 switch (msg->header.typecookie) {
699 case NGM_UDBP_COOKIE:
700 switch (msg->header.cmd) {
701 case NGM_UDBP_GET_STATUS:
703 struct ngudbpstat *stats;
705 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
710 stats = (struct ngudbpstat *) resp->data;
711 stats->packets_in = sc->packets_in;
712 stats->packets_out = sc->packets_out;
715 case NGM_UDBP_SET_FLAG:
716 if (msg->header.arglen != sizeof(u_int32_t)) {
720 sc->flags = *((u_int32_t *) msg->data);
723 error = EINVAL; /* unknown command */
728 error = EINVAL; /* unknown cookie type */
732 /* Take care of synchronous response, if any */
733 NG_RESPOND_MSG(error, node, item, resp);
739 * Accept data from the hook and queue it for output.
742 ng_udbp_rcvdata(hook_p hook, item_p item)
744 const udbp_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
746 struct ifqueue *xmitq_p;
749 struct ng_tag_prio *ptag;
755 * Now queue the data for when it can be sent
757 if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
758 NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
759 xmitq_p = (&sc->xmitq_hipri);
761 xmitq_p = (&sc->xmitq);
765 if (_IF_QFULL(xmitq_p)) {
772 _IF_ENQUEUE(xmitq_p, m);
774 if (!(sc->flags & OUT_BUSY))
775 udbp_setup_out_transfer(sc);
780 * It was an error case.
781 * check if we need to free the mbuf, and then return the error
788 * Do local shutdown processing..
789 * We are a persistant device, we refuse to go away, and
790 * only remove our links and reset ourself.
793 ng_udbp_rmnode(node_p node)
795 const udbp_p sc = NG_NODE_PRIVATE(node);
798 if (sc->flags & DISCONNECTED) {
800 * WE are really going away.. hardware must have gone.
801 * Assume that the hardware drive part will clear up the
802 * sc, in fact it may already have done so..
803 * In which case we may have just segfaulted..XXX
808 /* stolen from attach routine */
809 /* Drain the queues */
810 IF_DRAIN(&sc->xmitq_hipri);
811 IF_DRAIN(&sc->xmitq);
813 sc->packets_in = 0; /* reset stats */
815 NG_NODE_UNREF(node); /* forget it ever existed */
817 if ((err = ng_make_node_common(&ng_udbp_typestruct, &sc->node)) == 0) {
819 sprintf(nodename, "%s", device_get_nameunit(sc->sc_dev));
820 if ((err = ng_name_node(sc->node, nodename))) {
821 NG_NODE_UNREF(sc->node); /* out damned spot! */
822 sc->flags &= ~NETGRAPH_INITIALISED;
825 NG_NODE_SET_PRIVATE(sc->node, sc);
832 * This is called once we've already connected a new hook to the other node.
833 * It gives us a chance to balk at the last minute.
836 ng_udbp_connect(hook_p hook)
838 /* probably not at splnet, force outward queueing */
839 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
840 /* be really amiable and just say "YUP that's OK by me! " */
847 * For this type, removal of the last link destroys the node
850 ng_udbp_disconnect(hook_p hook)
852 const udbp_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
855 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
856 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
857 ng_rmnode_self(NG_HOOK_NODE(hook));