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1 /*-
2  * Copyright (c) 1996-2000 Whistle Communications, Inc.
3  * 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. 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.
16  *
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.
28  *
29  */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 /* Driver for arbitrary double bulk pipe devices.
35  * The driver assumes that there will be the same driver on the other side.
36  *
37  * XXX Some more information on what the framing of the IP packets looks like.
38  *
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  * streaming, and <5k to avoid overflowing the system with small TDs).
42  */
43
44
45 /* probe/attach/detach:
46  *  Connect the driver to the hardware and netgraph
47  *
48  *  The reason we submit a bulk in transfer is that USB does not know about
49  *  interrupts. The bulk transfer continuously polls the device for data.
50  *  While the device has no data available, the device NAKs the TDs. As soon
51  *  as there is data, the transfer happens and the data comes flowing in.
52  *
53  *  In case you were wondering, interrupt transfers happen exactly that way.
54  *  It therefore doesn't make sense to use the interrupt pipe to signal
55  *  'data ready' and then schedule a bulk transfer to fetch it. That would
56  *  incur a 2ms delay at least, without reducing bandwidth requirements.
57  *
58  */
59
60 #include <sys/stdint.h>
61 #include <sys/stddef.h>
62 #include <sys/param.h>
63 #include <sys/queue.h>
64 #include <sys/types.h>
65 #include <sys/systm.h>
66 #include <sys/kernel.h>
67 #include <sys/bus.h>
68 #include <sys/linker_set.h>
69 #include <sys/module.h>
70 #include <sys/lock.h>
71 #include <sys/mutex.h>
72 #include <sys/condvar.h>
73 #include <sys/sysctl.h>
74 #include <sys/sx.h>
75 #include <sys/unistd.h>
76 #include <sys/callout.h>
77 #include <sys/malloc.h>
78 #include <sys/priv.h>
79
80 #include <dev/usb/usb.h>
81 #include <dev/usb/usbdi.h>
82 #include <dev/usb/usbdi_util.h>
83 #include "usbdevs.h"
84
85 #define USB_DEBUG_VAR udbp_debug
86 #include <dev/usb/usb_debug.h>
87
88 #include <sys/mbuf.h>
89
90 #include <netgraph/ng_message.h>
91 #include <netgraph/netgraph.h>
92 #include <netgraph/ng_parse.h>
93 #include <netgraph/bluetooth/include/ng_bluetooth.h>
94
95 #include <dev/usb/misc/udbp.h>
96
97 #ifdef USB_DEBUG
98 static int udbp_debug = 0;
99
100 SYSCTL_NODE(_hw_usb, OID_AUTO, udbp, CTLFLAG_RW, 0, "USB udbp");
101 SYSCTL_INT(_hw_usb_udbp, OID_AUTO, debug, CTLFLAG_RW,
102     &udbp_debug, 0, "udbp debug level");
103 #endif
104
105 #define UDBP_TIMEOUT    2000            /* timeout on outbound transfers, in
106                                          * msecs */
107 #define UDBP_BUFFERSIZE MCLBYTES        /* maximum number of bytes in one
108                                          * transfer */
109 #define UDBP_T_WR       0
110 #define UDBP_T_RD       1
111 #define UDBP_T_WR_CS    2
112 #define UDBP_T_RD_CS    3
113 #define UDBP_T_MAX      4
114 #define UDBP_Q_MAXLEN   50
115
116 struct udbp_softc {
117
118         struct mtx sc_mtx;
119         struct ng_bt_mbufq sc_xmitq_hipri;      /* hi-priority transmit queue */
120         struct ng_bt_mbufq sc_xmitq;    /* low-priority transmit queue */
121
122         struct usb_xfer *sc_xfer[UDBP_T_MAX];
123         node_p  sc_node;                /* back pointer to node */
124         hook_p  sc_hook;                /* pointer to the hook */
125         struct mbuf *sc_bulk_in_buffer;
126
127         uint32_t sc_packets_in;         /* packets in from downstream */
128         uint32_t sc_packets_out;        /* packets out towards downstream */
129
130         uint8_t sc_flags;
131 #define UDBP_FLAG_READ_STALL    0x01    /* read transfer stalled */
132 #define UDBP_FLAG_WRITE_STALL   0x02    /* write transfer stalled */
133
134         uint8_t sc_name[16];
135 };
136
137 /* prototypes */
138
139 static int udbp_modload(module_t mod, int event, void *data);
140
141 static device_probe_t udbp_probe;
142 static device_attach_t udbp_attach;
143 static device_detach_t udbp_detach;
144
145 static usb_callback_t udbp_bulk_read_callback;
146 static usb_callback_t udbp_bulk_read_clear_stall_callback;
147 static usb_callback_t udbp_bulk_write_callback;
148 static usb_callback_t udbp_bulk_write_clear_stall_callback;
149
150 static void     udbp_bulk_read_complete(node_p, hook_p, void *, int);
151
152 static ng_constructor_t ng_udbp_constructor;
153 static ng_rcvmsg_t      ng_udbp_rcvmsg;
154 static ng_shutdown_t    ng_udbp_rmnode;
155 static ng_newhook_t     ng_udbp_newhook;
156 static ng_connect_t     ng_udbp_connect;
157 static ng_rcvdata_t     ng_udbp_rcvdata;
158 static ng_disconnect_t  ng_udbp_disconnect;
159
160 /* Parse type for struct ngudbpstat */
161 static const struct ng_parse_struct_field
162         ng_udbp_stat_type_fields[] = NG_UDBP_STATS_TYPE_INFO;
163
164 static const struct ng_parse_type ng_udbp_stat_type = {
165         &ng_parse_struct_type,
166         &ng_udbp_stat_type_fields
167 };
168
169 /* List of commands and how to convert arguments to/from ASCII */
170 static const struct ng_cmdlist ng_udbp_cmdlist[] = {
171         {
172                 NGM_UDBP_COOKIE,
173                 NGM_UDBP_GET_STATUS,
174                 "getstatus",
175                 NULL,
176                 &ng_udbp_stat_type,
177         },
178         {
179                 NGM_UDBP_COOKIE,
180                 NGM_UDBP_SET_FLAG,
181                 "setflag",
182                 &ng_parse_int32_type,
183                 NULL
184         },
185         {0}
186 };
187
188 /* Netgraph node type descriptor */
189 static struct ng_type ng_udbp_typestruct = {
190         .version = NG_ABI_VERSION,
191         .name = NG_UDBP_NODE_TYPE,
192         .constructor = ng_udbp_constructor,
193         .rcvmsg = ng_udbp_rcvmsg,
194         .shutdown = ng_udbp_rmnode,
195         .newhook = ng_udbp_newhook,
196         .connect = ng_udbp_connect,
197         .rcvdata = ng_udbp_rcvdata,
198         .disconnect = ng_udbp_disconnect,
199         .cmdlist = ng_udbp_cmdlist,
200 };
201
202 /* USB config */
203 static const struct usb_config udbp_config[UDBP_T_MAX] = {
204
205         [UDBP_T_WR] = {
206                 .type = UE_BULK,
207                 .endpoint = UE_ADDR_ANY,
208                 .direction = UE_DIR_OUT,
209                 .bufsize = UDBP_BUFFERSIZE,
210                 .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
211                 .callback = &udbp_bulk_write_callback,
212                 .timeout = UDBP_TIMEOUT,
213         },
214
215         [UDBP_T_RD] = {
216                 .type = UE_BULK,
217                 .endpoint = UE_ADDR_ANY,
218                 .direction = UE_DIR_IN,
219                 .bufsize = UDBP_BUFFERSIZE,
220                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
221                 .callback = &udbp_bulk_read_callback,
222         },
223
224         [UDBP_T_WR_CS] = {
225                 .type = UE_CONTROL,
226                 .endpoint = 0x00,       /* Control pipe */
227                 .direction = UE_DIR_ANY,
228                 .bufsize = sizeof(struct usb_device_request),
229                 .callback = &udbp_bulk_write_clear_stall_callback,
230                 .timeout = 1000,        /* 1 second */
231                 .interval = 50, /* 50ms */
232         },
233
234         [UDBP_T_RD_CS] = {
235                 .type = UE_CONTROL,
236                 .endpoint = 0x00,       /* Control pipe */
237                 .direction = UE_DIR_ANY,
238                 .bufsize = sizeof(struct usb_device_request),
239                 .callback = &udbp_bulk_read_clear_stall_callback,
240                 .timeout = 1000,        /* 1 second */
241                 .interval = 50, /* 50ms */
242         },
243 };
244
245 static devclass_t udbp_devclass;
246
247 static device_method_t udbp_methods[] = {
248         /* Device interface */
249         DEVMETHOD(device_probe, udbp_probe),
250         DEVMETHOD(device_attach, udbp_attach),
251         DEVMETHOD(device_detach, udbp_detach),
252         {0, 0}
253 };
254
255 static driver_t udbp_driver = {
256         .name = "udbp",
257         .methods = udbp_methods,
258         .size = sizeof(struct udbp_softc),
259 };
260
261 DRIVER_MODULE(udbp, uhub, udbp_driver, udbp_devclass, udbp_modload, 0);
262 MODULE_DEPEND(udbp, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
263 MODULE_DEPEND(udbp, usb, 1, 1, 1);
264
265 static int
266 udbp_modload(module_t mod, int event, void *data)
267 {
268         int error;
269
270         switch (event) {
271         case MOD_LOAD:
272                 error = ng_newtype(&ng_udbp_typestruct);
273                 if (error != 0) {
274                         printf("%s: Could not register "
275                             "Netgraph node type, error=%d\n",
276                             NG_UDBP_NODE_TYPE, error);
277                 }
278                 break;
279
280         case MOD_UNLOAD:
281                 error = ng_rmtype(&ng_udbp_typestruct);
282                 break;
283
284         default:
285                 error = EOPNOTSUPP;
286                 break;
287         }
288         return (error);
289 }
290
291 static int
292 udbp_probe(device_t dev)
293 {
294         struct usb_attach_arg *uaa = device_get_ivars(dev);
295
296         if (uaa->usb_mode != USB_MODE_HOST) {
297                 return (ENXIO);
298         }
299         /*
300          * XXX Julian, add the id of the device if you have one to test
301          * things with. run 'usbdevs -v' and note the 3 ID's that appear.
302          * The Vendor Id and Product Id are in hex and the Revision Id is in
303          * bcd. But as usual if the revision is 0x101 then you should
304          * compare the revision id in the device descriptor with 0x101 Or go
305          * search the file usbdevs.h. Maybe the device is already in there.
306          */
307         if (((uaa->info.idVendor == USB_VENDOR_NETCHIP) &&
308             (uaa->info.idProduct == USB_PRODUCT_NETCHIP_TURBOCONNECT)))
309                 return (0);
310
311         if (((uaa->info.idVendor == USB_VENDOR_PROLIFIC) &&
312             ((uaa->info.idProduct == USB_PRODUCT_PROLIFIC_PL2301) ||
313             (uaa->info.idProduct == USB_PRODUCT_PROLIFIC_PL2302))))
314                 return (0);
315
316         if ((uaa->info.idVendor == USB_VENDOR_ANCHOR) &&
317             (uaa->info.idProduct == USB_PRODUCT_ANCHOR_EZLINK))
318                 return (0);
319
320         if ((uaa->info.idVendor == USB_VENDOR_GENESYS) &&
321             (uaa->info.idProduct == USB_PRODUCT_GENESYS_GL620USB))
322                 return (0);
323
324         return (ENXIO);
325 }
326
327 static int
328 udbp_attach(device_t dev)
329 {
330         struct usb_attach_arg *uaa = device_get_ivars(dev);
331         struct udbp_softc *sc = device_get_softc(dev);
332         int error;
333
334         device_set_usb_desc(dev);
335
336         snprintf(sc->sc_name, sizeof(sc->sc_name),
337             "%s", device_get_nameunit(dev));
338
339         mtx_init(&sc->sc_mtx, "udbp lock", NULL, MTX_DEF | MTX_RECURSE);
340
341         error = usbd_transfer_setup(uaa->device, &uaa->info.bIfaceIndex,
342             sc->sc_xfer, udbp_config, UDBP_T_MAX, sc, &sc->sc_mtx);
343         if (error) {
344                 DPRINTF("error=%s\n", usbd_errstr(error));
345                 goto detach;
346         }
347         NG_BT_MBUFQ_INIT(&sc->sc_xmitq, UDBP_Q_MAXLEN);
348
349         NG_BT_MBUFQ_INIT(&sc->sc_xmitq_hipri, UDBP_Q_MAXLEN);
350
351         /* create Netgraph node */
352
353         if (ng_make_node_common(&ng_udbp_typestruct, &sc->sc_node) != 0) {
354                 printf("%s: Could not create Netgraph node\n",
355                     sc->sc_name);
356                 sc->sc_node = NULL;
357                 goto detach;
358         }
359         /* name node */
360
361         if (ng_name_node(sc->sc_node, sc->sc_name) != 0) {
362                 printf("%s: Could not name node\n",
363                     sc->sc_name);
364                 NG_NODE_UNREF(sc->sc_node);
365                 sc->sc_node = NULL;
366                 goto detach;
367         }
368         NG_NODE_SET_PRIVATE(sc->sc_node, sc);
369
370         /* the device is now operational */
371
372         return (0);                     /* success */
373
374 detach:
375         udbp_detach(dev);
376         return (ENOMEM);                /* failure */
377 }
378
379 static int
380 udbp_detach(device_t dev)
381 {
382         struct udbp_softc *sc = device_get_softc(dev);
383
384         /* destroy Netgraph node */
385
386         if (sc->sc_node != NULL) {
387                 NG_NODE_SET_PRIVATE(sc->sc_node, NULL);
388                 ng_rmnode_self(sc->sc_node);
389                 sc->sc_node = NULL;
390         }
391         /* free USB transfers, if any */
392
393         usbd_transfer_unsetup(sc->sc_xfer, UDBP_T_MAX);
394
395         mtx_destroy(&sc->sc_mtx);
396
397         /* destroy queues */
398
399         NG_BT_MBUFQ_DESTROY(&sc->sc_xmitq);
400         NG_BT_MBUFQ_DESTROY(&sc->sc_xmitq_hipri);
401
402         /* extra check */
403
404         if (sc->sc_bulk_in_buffer) {
405                 m_freem(sc->sc_bulk_in_buffer);
406                 sc->sc_bulk_in_buffer = NULL;
407         }
408         return (0);                     /* success */
409 }
410
411 static void
412 udbp_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
413 {
414         struct udbp_softc *sc = usbd_xfer_softc(xfer);
415         struct usb_page_cache *pc;
416         struct mbuf *m;
417         int actlen;
418
419         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
420
421         switch (USB_GET_STATE(xfer)) {
422         case USB_ST_TRANSFERRED:
423
424                 /* allocate new mbuf */
425
426                 MGETHDR(m, M_DONTWAIT, MT_DATA);
427
428                 if (m == NULL) {
429                         goto tr_setup;
430                 }
431                 MCLGET(m, M_DONTWAIT);
432
433                 if (!(m->m_flags & M_EXT)) {
434                         m_freem(m);
435                         goto tr_setup;
436                 }
437                 m->m_pkthdr.len = m->m_len = actlen;
438
439                 pc = usbd_xfer_get_frame(xfer, 0);
440                 usbd_copy_out(pc, 0, m->m_data, actlen);
441
442                 sc->sc_bulk_in_buffer = m;
443
444                 DPRINTF("received package %d bytes\n", actlen);
445
446         case USB_ST_SETUP:
447 tr_setup:
448                 if (sc->sc_bulk_in_buffer) {
449                         ng_send_fn(sc->sc_node, NULL, &udbp_bulk_read_complete, NULL, 0);
450                         return;
451                 }
452                 if (sc->sc_flags & UDBP_FLAG_READ_STALL) {
453                         usbd_transfer_start(sc->sc_xfer[UDBP_T_RD_CS]);
454                         return;
455                 }
456                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
457                 usbd_transfer_submit(xfer);
458                 return;
459
460         default:                        /* Error */
461                 if (error != USB_ERR_CANCELLED) {
462                         /* try to clear stall first */
463                         sc->sc_flags |= UDBP_FLAG_READ_STALL;
464                         usbd_transfer_start(sc->sc_xfer[UDBP_T_RD_CS]);
465                 }
466                 return;
467
468         }
469 }
470
471 static void
472 udbp_bulk_read_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
473 {
474         struct udbp_softc *sc = usbd_xfer_softc(xfer);
475         struct usb_xfer *xfer_other = sc->sc_xfer[UDBP_T_RD];
476
477         if (usbd_clear_stall_callback(xfer, xfer_other)) {
478                 DPRINTF("stall cleared\n");
479                 sc->sc_flags &= ~UDBP_FLAG_READ_STALL;
480                 usbd_transfer_start(xfer_other);
481         }
482 }
483
484 static void
485 udbp_bulk_read_complete(node_p node, hook_p hook, void *arg1, int arg2)
486 {
487         struct udbp_softc *sc = NG_NODE_PRIVATE(node);
488         struct mbuf *m;
489         int error;
490
491         if (sc == NULL) {
492                 return;
493         }
494         mtx_lock(&sc->sc_mtx);
495
496         m = sc->sc_bulk_in_buffer;
497
498         if (m) {
499
500                 sc->sc_bulk_in_buffer = NULL;
501
502                 if ((sc->sc_hook == NULL) ||
503                     NG_HOOK_NOT_VALID(sc->sc_hook)) {
504                         DPRINTF("No upstream hook\n");
505                         goto done;
506                 }
507                 sc->sc_packets_in++;
508
509                 NG_SEND_DATA_ONLY(error, sc->sc_hook, m);
510
511                 m = NULL;
512         }
513 done:
514         if (m) {
515                 m_freem(m);
516         }
517         /* start USB bulk-in transfer, if not already started */
518
519         usbd_transfer_start(sc->sc_xfer[UDBP_T_RD]);
520
521         mtx_unlock(&sc->sc_mtx);
522 }
523
524 static void
525 udbp_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
526 {
527         struct udbp_softc *sc = usbd_xfer_softc(xfer);
528         struct usb_page_cache *pc;
529         struct mbuf *m;
530
531         switch (USB_GET_STATE(xfer)) {
532         case USB_ST_TRANSFERRED:
533
534                 sc->sc_packets_out++;
535
536         case USB_ST_SETUP:
537                 if (sc->sc_flags & UDBP_FLAG_WRITE_STALL) {
538                         usbd_transfer_start(sc->sc_xfer[UDBP_T_WR_CS]);
539                         return;
540                 }
541                 /* get next mbuf, if any */
542
543                 NG_BT_MBUFQ_DEQUEUE(&sc->sc_xmitq_hipri, m);
544                 if (m == NULL) {
545                         NG_BT_MBUFQ_DEQUEUE(&sc->sc_xmitq, m);
546                         if (m == NULL) {
547                                 DPRINTF("Data queue is empty\n");
548                                 return;
549                         }
550                 }
551                 if (m->m_pkthdr.len > MCLBYTES) {
552                         DPRINTF("truncating large packet "
553                             "from %d to %d bytes\n", m->m_pkthdr.len,
554                             MCLBYTES);
555                         m->m_pkthdr.len = MCLBYTES;
556                 }
557                 pc = usbd_xfer_get_frame(xfer, 0);
558                 usbd_m_copy_in(pc, 0, m, 0, m->m_pkthdr.len);
559
560                 usbd_xfer_set_frame_len(xfer, 0, m->m_pkthdr.len);
561
562                 DPRINTF("packet out: %d bytes\n", m->m_pkthdr.len);
563
564                 m_freem(m);
565
566                 usbd_transfer_submit(xfer);
567                 return;
568
569         default:                        /* Error */
570                 if (error != USB_ERR_CANCELLED) {
571                         /* try to clear stall first */
572                         sc->sc_flags |= UDBP_FLAG_WRITE_STALL;
573                         usbd_transfer_start(sc->sc_xfer[UDBP_T_WR_CS]);
574                 }
575                 return;
576
577         }
578 }
579
580 static void
581 udbp_bulk_write_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
582 {
583         struct udbp_softc *sc = usbd_xfer_softc(xfer);
584         struct usb_xfer *xfer_other = sc->sc_xfer[UDBP_T_WR];
585
586         if (usbd_clear_stall_callback(xfer, xfer_other)) {
587                 DPRINTF("stall cleared\n");
588                 sc->sc_flags &= ~UDBP_FLAG_WRITE_STALL;
589                 usbd_transfer_start(xfer_other);
590         }
591 }
592
593 /***********************************************************************
594  * Start of Netgraph methods
595  **********************************************************************/
596
597 /*
598  * If this is a device node so this work is done in the attach()
599  * routine and the constructor will return EINVAL as you should not be able
600  * to create nodes that depend on hardware (unless you can add the hardware :)
601  */
602 static int
603 ng_udbp_constructor(node_p node)
604 {
605         return (EINVAL);
606 }
607
608 /*
609  * Give our ok for a hook to be added...
610  * If we are not running this might kick a device into life.
611  * Possibly decode information out of the hook name.
612  * Add the hook's private info to the hook structure.
613  * (if we had some). In this example, we assume that there is a
614  * an array of structs, called 'channel' in the private info,
615  * one for each active channel. The private
616  * pointer of each hook points to the appropriate UDBP_hookinfo struct
617  * so that the source of an input packet is easily identified.
618  */
619 static int
620 ng_udbp_newhook(node_p node, hook_p hook, const char *name)
621 {
622         struct udbp_softc *sc = NG_NODE_PRIVATE(node);
623         int32_t error = 0;
624
625         if (strcmp(name, NG_UDBP_HOOK_NAME)) {
626                 return (EINVAL);
627         }
628         mtx_lock(&sc->sc_mtx);
629
630         if (sc->sc_hook != NULL) {
631                 error = EISCONN;
632         } else {
633                 sc->sc_hook = hook;
634                 NG_HOOK_SET_PRIVATE(hook, NULL);
635         }
636
637         mtx_unlock(&sc->sc_mtx);
638
639         return (error);
640 }
641
642 /*
643  * Get a netgraph control message.
644  * Check it is one we understand. If needed, send a response.
645  * We could save the address for an async action later, but don't here.
646  * Always free the message.
647  * The response should be in a malloc'd region that the caller can 'free'.
648  * A response is not required.
649  * Theoretically you could respond defferently to old message types if
650  * the cookie in the header didn't match what we consider to be current
651  * (so that old userland programs could continue to work).
652  */
653 static int
654 ng_udbp_rcvmsg(node_p node, item_p item, hook_p lasthook)
655 {
656         struct udbp_softc *sc = NG_NODE_PRIVATE(node);
657         struct ng_mesg *resp = NULL;
658         int error = 0;
659         struct ng_mesg *msg;
660
661         NGI_GET_MSG(item, msg);
662         /* Deal with message according to cookie and command */
663         switch (msg->header.typecookie) {
664         case NGM_UDBP_COOKIE:
665                 switch (msg->header.cmd) {
666                 case NGM_UDBP_GET_STATUS:
667                         {
668                                 struct ngudbpstat *stats;
669
670                                 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
671                                 if (!resp) {
672                                         error = ENOMEM;
673                                         break;
674                                 }
675                                 stats = (struct ngudbpstat *)resp->data;
676                                 mtx_lock(&sc->sc_mtx);
677                                 stats->packets_in = sc->sc_packets_in;
678                                 stats->packets_out = sc->sc_packets_out;
679                                 mtx_unlock(&sc->sc_mtx);
680                                 break;
681                         }
682                 case NGM_UDBP_SET_FLAG:
683                         if (msg->header.arglen != sizeof(uint32_t)) {
684                                 error = EINVAL;
685                                 break;
686                         }
687                         DPRINTF("flags = 0x%08x\n",
688                             *((uint32_t *)msg->data));
689                         break;
690                 default:
691                         error = EINVAL; /* unknown command */
692                         break;
693                 }
694                 break;
695         default:
696                 error = EINVAL;         /* unknown cookie type */
697                 break;
698         }
699
700         /* Take care of synchronous response, if any */
701         NG_RESPOND_MSG(error, node, item, resp);
702         NG_FREE_MSG(msg);
703         return (error);
704 }
705
706 /*
707  * Accept data from the hook and queue it for output.
708  */
709 static int
710 ng_udbp_rcvdata(hook_p hook, item_p item)
711 {
712         struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
713         struct ng_bt_mbufq *queue_ptr;
714         struct mbuf *m;
715         struct ng_tag_prio *ptag;
716         int error;
717
718         if (sc == NULL) {
719                 NG_FREE_ITEM(item);
720                 return (EHOSTDOWN);
721         }
722         NGI_GET_M(item, m);
723         NG_FREE_ITEM(item);
724
725         /*
726          * Now queue the data for when it can be sent
727          */
728         ptag = (void *)m_tag_locate(m, NGM_GENERIC_COOKIE,
729             NG_TAG_PRIO, NULL);
730
731         if (ptag && (ptag->priority > NG_PRIO_CUTOFF))
732                 queue_ptr = &sc->sc_xmitq_hipri;
733         else
734                 queue_ptr = &sc->sc_xmitq;
735
736         mtx_lock(&sc->sc_mtx);
737
738         if (NG_BT_MBUFQ_FULL(queue_ptr)) {
739                 NG_BT_MBUFQ_DROP(queue_ptr);
740                 NG_FREE_M(m);
741                 error = ENOBUFS;
742         } else {
743                 NG_BT_MBUFQ_ENQUEUE(queue_ptr, m);
744                 /*
745                  * start bulk-out transfer, if not already started:
746                  */
747                 usbd_transfer_start(sc->sc_xfer[UDBP_T_WR]);
748                 error = 0;
749         }
750
751         mtx_unlock(&sc->sc_mtx);
752
753         return (error);
754 }
755
756 /*
757  * Do local shutdown processing..
758  * We are a persistant device, we refuse to go away, and
759  * only remove our links and reset ourself.
760  */
761 static int
762 ng_udbp_rmnode(node_p node)
763 {
764         struct udbp_softc *sc = NG_NODE_PRIVATE(node);
765
766         /* Let old node go */
767         NG_NODE_SET_PRIVATE(node, NULL);
768         NG_NODE_UNREF(node);            /* forget it ever existed */
769
770         if (sc == NULL) {
771                 goto done;
772         }
773         /* Create Netgraph node */
774         if (ng_make_node_common(&ng_udbp_typestruct, &sc->sc_node) != 0) {
775                 printf("%s: Could not create Netgraph node\n",
776                     sc->sc_name);
777                 sc->sc_node = NULL;
778                 goto done;
779         }
780         /* Name node */
781         if (ng_name_node(sc->sc_node, sc->sc_name) != 0) {
782                 printf("%s: Could not name Netgraph node\n",
783                     sc->sc_name);
784                 NG_NODE_UNREF(sc->sc_node);
785                 sc->sc_node = NULL;
786                 goto done;
787         }
788         NG_NODE_SET_PRIVATE(sc->sc_node, sc);
789
790 done:
791         if (sc) {
792                 mtx_unlock(&sc->sc_mtx);
793         }
794         return (0);
795 }
796
797 /*
798  * This is called once we've already connected a new hook to the other node.
799  * It gives us a chance to balk at the last minute.
800  */
801 static int
802 ng_udbp_connect(hook_p hook)
803 {
804         struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
805
806         /* probably not at splnet, force outward queueing */
807         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
808
809         mtx_lock(&sc->sc_mtx);
810
811         sc->sc_flags |= (UDBP_FLAG_READ_STALL |
812             UDBP_FLAG_WRITE_STALL);
813
814         /* start bulk-in transfer */
815         usbd_transfer_start(sc->sc_xfer[UDBP_T_RD]);
816
817         /* start bulk-out transfer */
818         usbd_transfer_start(sc->sc_xfer[UDBP_T_WR]);
819
820         mtx_unlock(&sc->sc_mtx);
821
822         return (0);
823 }
824
825 /*
826  * Dook disconnection
827  *
828  * For this type, removal of the last link destroys the node
829  */
830 static int
831 ng_udbp_disconnect(hook_p hook)
832 {
833         struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
834         int error = 0;
835
836         if (sc != NULL) {
837
838                 mtx_lock(&sc->sc_mtx);
839
840                 if (hook != sc->sc_hook) {
841                         error = EINVAL;
842                 } else {
843
844                         /* stop bulk-in transfer */
845                         usbd_transfer_stop(sc->sc_xfer[UDBP_T_RD_CS]);
846                         usbd_transfer_stop(sc->sc_xfer[UDBP_T_RD]);
847
848                         /* stop bulk-out transfer */
849                         usbd_transfer_stop(sc->sc_xfer[UDBP_T_WR_CS]);
850                         usbd_transfer_stop(sc->sc_xfer[UDBP_T_WR]);
851
852                         /* cleanup queues */
853                         NG_BT_MBUFQ_DRAIN(&sc->sc_xmitq);
854                         NG_BT_MBUFQ_DRAIN(&sc->sc_xmitq_hipri);
855
856                         if (sc->sc_bulk_in_buffer) {
857                                 m_freem(sc->sc_bulk_in_buffer);
858                                 sc->sc_bulk_in_buffer = NULL;
859                         }
860                         sc->sc_hook = NULL;
861                 }
862
863                 mtx_unlock(&sc->sc_mtx);
864         }
865         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
866             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
867                 ng_rmnode_self(NG_HOOK_NODE(hook));
868
869         return (error);
870 }