Use BPF_TAP and BPF_MTAP instead of the expanded versions where possible.
[dragonfly.git] / sys / dev / netif / ic / if_ic.c
1 /*-
2  * Copyright (c) 1998 Nicolas Souchu
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  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD: src/sys/dev/iicbus/if_ic.c,v 1.8 1999/12/29 04:35:39 peter Exp $
27  * $DragonFly: src/sys/dev/netif/ic/if_ic.c,v 1.9 2005/01/23 20:21:31 joerg Exp $
28  */
29
30 /*
31  * I2C bus IP driver
32  */
33
34 #ifdef _KERNEL
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/proc.h>
38 #include <sys/mbuf.h>
39 #include <sys/socket.h>
40 #include <sys/filio.h>
41 #include <sys/sockio.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
44 #include <sys/bus.h>
45 #include <sys/time.h>
46 #include <sys/malloc.h>
47
48 #include <net/if.h>
49 #include <net/if_types.h>
50 #include <net/netisr.h>
51
52 #endif
53 #include <sys/mbuf.h>
54 #include <sys/socket.h>
55 #include <net/netisr.h>
56 #include <net/route.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip.h>
61 #include <netinet/if_ether.h>
62
63 #include <net/bpf.h>
64
65 #include <bus/iicbus/iiconf.h>
66 #include <bus/iicbus/iicbus.h>
67
68 #include "iicbus_if.h"
69
70 #define ICHDRLEN        sizeof(u_int)
71 #define ICMTU           1500            /* default mtu */
72
73 struct ic_softc {
74         struct ifnet ic_if;
75
76         u_char ic_addr;                 /* peer I2C address */
77
78         int ic_sending;
79
80         char *ic_obuf;
81         char *ic_ifbuf;
82         char *ic_cp;
83
84         int ic_xfercnt;
85
86         int ic_iferrs;
87 };
88
89 static devclass_t ic_devclass;
90
91 static int icprobe(device_t);
92 static int icattach(device_t);
93
94 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
95 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
96                 struct rtentry *);
97
98 static void icintr(device_t, int, char *);
99
100 static device_method_t ic_methods[] = {
101         /* device interface */
102         DEVMETHOD(device_probe,         icprobe),
103         DEVMETHOD(device_attach,        icattach),
104
105         /* iicbus interface */
106         DEVMETHOD(iicbus_intr,          icintr),
107
108         { 0, 0 }
109 };
110
111 static driver_t ic_driver = {
112         "ic",
113         ic_methods,
114         sizeof(struct ic_softc),
115 };
116
117 /*
118  * icprobe()
119  */
120 static int
121 icprobe(device_t dev)
122 {
123         return (0);
124 }
125         
126 /*
127  * icattach()
128  */
129 static int
130 icattach(device_t dev)
131 {
132         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
133         struct ifnet *ifp = &sc->ic_if;
134
135         sc->ic_addr = iicbus_get_addr(dev);
136
137         ifp->if_softc = sc;
138         if_initname(ifp, "ic", device_get_unit(dev));
139         ifp->if_mtu = ICMTU;
140         ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
141         ifp->if_ioctl = icioctl;
142         ifp->if_output = icoutput;
143         ifp->if_type = IFT_PARA;
144         ifp->if_hdrlen = 0;
145         ifp->if_addrlen = 0;
146         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
147
148         if_attach(ifp);
149
150         bpfattach(ifp, DLT_NULL, ICHDRLEN);
151
152         return (0);
153 }
154
155 /*
156  * iciotcl()
157  */
158 static int
159 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
160 {
161     device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
162     device_t parent = device_get_parent(icdev);
163     struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
164
165     struct ifaddr *ifa = (struct ifaddr *)data;
166     struct ifreq *ifr = (struct ifreq *)data;
167
168     u_char *iptr, *optr;
169     int error;
170
171     switch (cmd) {
172
173     case SIOCSIFDSTADDR:
174     case SIOCAIFADDR:
175     case SIOCSIFADDR:
176         if (ifa->ifa_addr->sa_family != AF_INET)
177             return EAFNOSUPPORT;
178         ifp->if_flags |= IFF_UP;
179         /* FALLTHROUGH */
180     case SIOCSIFFLAGS:
181         if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
182
183             /* XXX disable PCF */
184             ifp->if_flags &= ~IFF_RUNNING;
185
186             /* IFF_UP is not set, try to release the bus anyway */
187             iicbus_release_bus(parent, icdev);
188             break;
189         }
190         if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
191
192             if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
193                 return (error);
194
195             sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
196                                   M_DEVBUF, M_WAITOK);
197             if (!sc->ic_obuf) {
198                 iicbus_release_bus(parent, icdev);
199                 return ENOBUFS;
200             }
201
202             sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
203                                   M_DEVBUF, M_WAITOK);
204             if (!sc->ic_ifbuf) {
205                 iicbus_release_bus(parent, icdev);
206                 return ENOBUFS;
207             }
208
209             iicbus_reset(parent, IIC_FASTEST, 0, NULL);
210
211             ifp->if_flags |= IFF_RUNNING;
212         }
213         break;
214
215     case SIOCSIFMTU:
216         /* save previous buffers */
217         iptr = sc->ic_ifbuf;
218         optr = sc->ic_obuf;
219
220         /* allocate input buffer */
221         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
222         if (!sc->ic_ifbuf) {
223
224             sc->ic_ifbuf = iptr;
225             sc->ic_obuf = optr;
226
227             return ENOBUFS;
228         }
229
230         /* allocate output buffer */
231         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
232         if (!sc->ic_obuf) {
233
234             free(sc->ic_ifbuf,M_DEVBUF);
235
236             sc->ic_ifbuf = iptr;
237             sc->ic_obuf = optr;
238
239             return ENOBUFS;
240         }
241
242         if (iptr)
243             free(iptr,M_DEVBUF);
244
245         if (optr)
246             free(optr,M_DEVBUF);
247
248         sc->ic_if.if_mtu = ifr->ifr_mtu;
249         break;
250
251     case SIOCGIFMTU:
252         ifr->ifr_mtu = sc->ic_if.if_mtu;
253         break;
254
255     case SIOCADDMULTI:
256     case SIOCDELMULTI:
257         if (ifr == 0) {
258             return EAFNOSUPPORT;                /* XXX */
259         }
260         switch (ifr->ifr_addr.sa_family) {
261
262         case AF_INET:
263             break;
264
265         default:
266             return EAFNOSUPPORT;
267         }
268         break;
269
270     default:
271         return EINVAL;
272     }
273     return 0;
274 }
275
276 /*
277  * icintr()
278  */
279 static void
280 icintr (device_t dev, int event, char *ptr)
281 {
282         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
283         int unit = device_get_unit(dev);
284         int s, len;
285         struct mbuf *top;
286         
287         s = splhigh();
288
289         switch (event) {
290
291         case INTR_GENERAL:
292         case INTR_START:
293                 sc->ic_cp = sc->ic_ifbuf;
294                 sc->ic_xfercnt = 0;
295                 break;
296
297         case INTR_STOP:
298
299           /* if any error occured during transfert,
300            * drop the packet */
301           if (sc->ic_iferrs)
302             goto err;
303
304           if ((len = sc->ic_xfercnt) == 0)
305                 break;                                  /* ignore */
306
307           if (len <= ICHDRLEN)
308             goto err;
309
310           len -= ICHDRLEN;
311           sc->ic_if.if_ipackets ++;
312           sc->ic_if.if_ibytes += len;
313
314           BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
315
316           top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
317
318           if (top)
319             netisr_dispatch(NETISR_IP, top);
320           break;
321
322         err:
323           printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
324
325           sc->ic_iferrs = 0;                    /* reset error count */
326           sc->ic_if.if_ierrors ++;
327
328           break;
329
330         case INTR_RECEIVE:
331                 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
332                         sc->ic_iferrs ++;
333
334                 } else {
335                         *sc->ic_cp++ = *ptr;
336                         sc->ic_xfercnt ++;
337                 }
338                 break;
339
340         case INTR_NOACK:                        /* xfer terminated by master */
341                 break;
342
343         case INTR_TRANSMIT:
344                 *ptr = 0xff;                                    /* XXX */
345                 break;
346
347         case INTR_ERROR:
348                 sc->ic_iferrs ++;
349                 break;
350
351         default:
352                 panic("%s: unknown event (%d)!", __FUNCTION__, event);
353         }
354
355         splx(s);
356         return;
357 }
358
359 /*
360  * icoutput()
361  */
362 static int
363 icoutput(struct ifnet *ifp, struct mbuf *m,
364         struct sockaddr *dst, struct rtentry *rt)
365 {
366         device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
367         device_t parent = device_get_parent(icdev);
368         struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
369
370         int s, len, sent;
371         struct mbuf *mm;
372         u_char *cp;
373         u_int hdr = dst->sa_family;
374
375         ifp->if_flags |= IFF_RUNNING;
376
377         s = splhigh();
378
379         /* already sending? */
380         if (sc->ic_sending) {
381                 ifp->if_oerrors ++;
382                 goto error;
383         }
384                 
385         /* insert header */
386         bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
387
388         cp = sc->ic_obuf + ICHDRLEN;
389         len = 0;
390         mm = m;
391         do {
392                 if (len + mm->m_len > sc->ic_if.if_mtu) {
393                         /* packet to large */
394                         ifp->if_oerrors ++;
395                         goto error;
396                 }
397                         
398                 bcopy(mtod(mm,char *), cp, mm->m_len);
399                 cp += mm->m_len;
400                 len += mm->m_len;
401
402         } while ((mm = mm->m_next));
403
404         if (ifp->if_bpf) {
405                 struct mbuf m0, *n = m;
406
407                 /*
408                  * We need to prepend the address family as
409                  * a four byte field.  Cons up a dummy header
410                  * to pacify bpf.  This is safe because bpf
411                  * will only read from the mbuf (i.e., it won't
412                  * try to free it or keep a pointer a to it).
413                  */
414                 m0.m_next = m;
415                 m0.m_len = sizeof(u_int);
416                 m0.m_data = (char *)&hdr;
417                 n = &m0;
418
419                 bpf_mtap(ifp, n);
420         }
421
422         sc->ic_sending = 1;
423
424         m_freem(m);
425         splx(s);
426
427         /* send the packet */
428         if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
429                                 len + ICHDRLEN, &sent))
430
431                 ifp->if_oerrors ++;
432         else {
433                 ifp->if_opackets ++;
434                 ifp->if_obytes += len;
435         }
436
437         sc->ic_sending = 0;
438
439         return (0);
440
441 error:
442         m_freem(m);
443         splx(s);
444
445         return(0);
446 }
447
448 DECLARE_DUMMY_MODULE(if_ic);
449 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, 0, 0);
450