ofnet.c revision 1.25 
1/*	$NetBSD: ofnet.c,v 1.25 2002/09/18 01:47:08 chs Exp $	*/
2
3/*
4 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
5 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__KERNEL_RCSID(0, "$NetBSD: ofnet.c,v 1.25 2002/09/18 01:47:08 chs Exp $");
36
37#include "ofnet.h"
38#include "opt_inet.h"
39#include "bpfilter.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/callout.h>
44#include <sys/device.h>
45#include <sys/disk.h>
46#include <sys/ioctl.h>
47#include <sys/mbuf.h>
48#include <sys/socket.h>
49#include <sys/syslog.h>
50
51#include <net/if.h>
52#include <net/if_ether.h>
53
54#ifdef INET
55#include <netinet/in.h>
56#include <netinet/if_inarp.h>
57#endif
58
59#if NBPFILTER > 0
60#include <net/bpf.h>
61#include <net/bpfdesc.h>
62#endif
63
64#include <dev/ofw/openfirm.h>
65
66#if NIPKDB_OFN > 0
67#include <ipkdb/ipkdb.h>
68#include <machine/ipkdb.h>
69
70struct cfattach ipkdb_ofn_ca = {
71	0, ipkdb_probe, ipkdb_attach
72};
73
74static struct ipkdb_if *kifp;
75static struct ofnet_softc *ipkdb_of;
76
77static int ipkdbprobe (struct cfdata *, void *);
78#endif
79
80struct ofnet_softc {
81	struct device sc_dev;
82	int sc_phandle;
83	int sc_ihandle;
84	struct ethercom sc_ethercom;
85	struct callout sc_callout;
86};
87
88static int ofnet_match (struct device *, struct cfdata *, void *);
89static void ofnet_attach (struct device *, struct device *, void *);
90
91struct cfattach ofnet_ca = {
92	sizeof(struct ofnet_softc), ofnet_match, ofnet_attach
93};
94
95static void ofnet_read (struct ofnet_softc *);
96static void ofnet_timer (void *);
97static void ofnet_init (struct ofnet_softc *);
98static void ofnet_stop (struct ofnet_softc *);
99
100static void ofnet_start (struct ifnet *);
101static int ofnet_ioctl (struct ifnet *, u_long, caddr_t);
102static void ofnet_watchdog (struct ifnet *);
103
104static int
105ofnet_match(struct device *parent, struct cfdata *match, void *aux)
106{
107	struct ofbus_attach_args *oba = aux;
108	char type[32];
109	int l;
110
111#if NIPKDB_OFN > 0
112	if (!parent)
113		return ipkdbprobe(match, aux);
114#endif
115	if (strcmp(oba->oba_busname, "ofw"))
116		return (0);
117	if ((l = OF_getprop(oba->oba_phandle, "device_type", type,
118	    sizeof type - 1)) < 0)
119		return 0;
120	if (l >= sizeof type)
121		return 0;
122	type[l] = 0;
123	if (strcmp(type, "network"))
124		return 0;
125	return 1;
126}
127
128static void
129ofnet_attach(struct device *parent, struct device *self, void *aux)
130{
131	struct ofnet_softc *of = (void *)self;
132	struct ifnet *ifp = &of->sc_ethercom.ec_if;
133	struct ofbus_attach_args *oba = aux;
134	char path[256];
135	int l;
136	u_int8_t myaddr[ETHER_ADDR_LEN];
137
138	of->sc_phandle = oba->oba_phandle;
139#if NIPKDB_OFN > 0
140	if (kifp &&
141	    kifp->unit - 1 == of->sc_dev.dv_unit &&
142	    OF_instance_to_package(kifp->port) == oba->oba_phandle)  {
143		ipkdb_of = of;
144		of->sc_ihandle = kifp->port;
145	} else
146#endif
147	if ((l = OF_package_to_path(oba->oba_phandle, path,
148	    sizeof path - 1)) < 0 ||
149	    l >= sizeof path ||
150	    (path[l] = 0, !(of->sc_ihandle = OF_open(path))))
151		panic("ofnet_attach: unable to open");
152	if (OF_getprop(oba->oba_phandle, "mac-address", myaddr,
153	    sizeof myaddr) < 0)
154		panic("ofnet_attach: no mac-address");
155	printf(": address %s\n", ether_sprintf(myaddr));
156
157	callout_init(&of->sc_callout);
158
159	bcopy(of->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
160	ifp->if_softc = of;
161	ifp->if_start = ofnet_start;
162	ifp->if_ioctl = ofnet_ioctl;
163	ifp->if_watchdog = ofnet_watchdog;
164	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
165	IFQ_SET_READY(&ifp->if_snd);
166
167	if_attach(ifp);
168	ether_ifattach(ifp, myaddr);
169}
170
171static char buf[ETHERMTU + sizeof(struct ether_header)];
172
173static void
174ofnet_read(struct ofnet_softc *of)
175{
176	struct ifnet *ifp = &of->sc_ethercom.ec_if;
177	struct mbuf *m, **mp, *head;
178	int s, l, len;
179	char *bufp;
180
181	s = splnet();
182#if NIPKDB_OFN > 0
183	ipkdbrint(kifp, ifp);
184#endif
185	for (;;) {
186		if ((len = OF_read(of->sc_ihandle, buf, sizeof buf)) < 0) {
187			if (len == -2 || len == 0)
188				break;
189			ifp->if_ierrors++;
190			continue;
191		}
192		if (len < sizeof(struct ether_header)) {
193			ifp->if_ierrors++;
194			continue;
195		}
196		bufp = buf;
197
198		/* Allocate a header mbuf */
199		MGETHDR(m, M_DONTWAIT, MT_DATA);
200		if (m == 0) {
201			ifp->if_ierrors++;
202			continue;
203		}
204		m->m_pkthdr.rcvif = ifp;
205		m->m_pkthdr.len = len;
206
207		/*
208		 * We don't know if the interface included the FCS
209		 * or not.  For now, assume that it did if we got
210		 * a packet length that looks like it could include
211		 * the FCS.
212 		 *
213		 * XXX Yuck.
214		 */
215
216		if (len > (ETHER_MAX_LEN - ETHER_CRC_LEN))
217			m->m_flags |= M_HASFCS;
218
219		l = MHLEN;
220		head = 0;
221		mp = &head;
222
223		while (len > 0) {
224			if (head) {
225				MGET(m, M_DONTWAIT, MT_DATA);
226				if (m == 0) {
227					ifp->if_ierrors++;
228					m_freem(head);
229					head = 0;
230					break;
231				}
232				l = MLEN;
233			}
234			if (len >= MINCLSIZE) {
235				MCLGET(m, M_DONTWAIT);
236				if ((m->m_flags & M_EXT) == 0) {
237					ifp->if_ierrors++;
238					m_free(m);
239					m_freem(head);
240					head = 0;
241					break;
242				}
243				l = MCLBYTES;
244			}
245
246			/*
247			 * Make sure the data after the Ethernet header
248			 * is aligned.
249			 *
250			 * XXX Assumes the device is an ethernet, but
251			 * XXX then so does other code in this driver.
252			 */
253			if (head == NULL) {
254				caddr_t newdata = (caddr_t)ALIGN(m->m_data +
255				      sizeof(struct ether_header)) -
256				    sizeof(struct ether_header);
257				l -= newdata - m->m_data;
258				m->m_data = newdata;
259			}
260
261			m->m_len = l = min(len, l);
262			bcopy(bufp, mtod(m, char *), l);
263			bufp += l;
264			len -= l;
265			*mp = m;
266			mp = &m->m_next;
267		}
268		if (head == 0)
269			continue;
270
271#if NBPFILTER > 0
272		if (ifp->if_bpf)
273			bpf_mtap(ifp->if_bpf, m);
274#endif
275		ifp->if_ipackets++;
276		(*ifp->if_input)(ifp, head);
277	}
278	splx(s);
279}
280
281static void
282ofnet_timer(arg)
283	void *arg;
284{
285	struct ofnet_softc *of = arg;
286
287	ofnet_read(of);
288	callout_reset(&of->sc_callout, 1, ofnet_timer, of);
289}
290
291static void
292ofnet_init(struct ofnet_softc *of)
293{
294	struct ifnet *ifp = &of->sc_ethercom.ec_if;
295
296	if (ifp->if_flags & IFF_RUNNING)
297		return;
298
299	ifp->if_flags |= IFF_RUNNING;
300	/* Start reading from interface */
301	ofnet_timer(of);
302	/* Attempt to start output */
303	ofnet_start(ifp);
304}
305
306static void
307ofnet_stop(struct ofnet_softc *of)
308{
309	callout_stop(&of->sc_callout);
310	of->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
311}
312
313static void
314ofnet_start(struct ifnet *ifp)
315{
316	struct ofnet_softc *of = ifp->if_softc;
317	struct mbuf *m, *m0;
318	char *bufp;
319	int len;
320
321	if (!(ifp->if_flags & IFF_RUNNING))
322		return;
323
324	for (;;) {
325		/* First try reading any packets */
326		ofnet_read(of);
327
328		/* Now get the first packet on the queue */
329		IFQ_DEQUEUE(&ifp->if_snd, m0);
330		if (!m0)
331			return;
332
333		if (!(m0->m_flags & M_PKTHDR))
334			panic("ofnet_start: no header mbuf");
335		len = m0->m_pkthdr.len;
336
337#if NBPFILTER > 0
338		if (ifp->if_bpf)
339			bpf_mtap(ifp->if_bpf, m0);
340#endif
341
342		if (len > ETHERMTU + sizeof(struct ether_header)) {
343			/* packet too large, toss it */
344			ifp->if_oerrors++;
345			m_freem(m0);
346			continue;
347		}
348
349		for (bufp = buf; (m = m0) != NULL;) {
350			bcopy(mtod(m, char *), bufp, m->m_len);
351			bufp += m->m_len;
352			MFREE(m, m0);
353		}
354
355		/*
356		 * We don't know if the interface will auto-pad for
357		 * us, so make sure it's at least as large as a
358		 * minimum size Ethernet packet.
359		 */
360
361		if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN))
362			len = ETHER_MIN_LEN - ETHER_CRC_LEN;
363		else
364			len = bufp - buf;
365
366		if (OF_write(of->sc_ihandle, buf, len) != len)
367			ifp->if_oerrors++;
368		else
369			ifp->if_opackets++;
370	}
371}
372
373static int
374ofnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
375{
376	struct ofnet_softc *of = ifp->if_softc;
377	struct ifaddr *ifa = (struct ifaddr *)data;
378	/* struct ifreq *ifr = (struct ifreq *)data; */
379	int error = 0;
380
381	switch (cmd) {
382	case SIOCSIFADDR:
383		ifp->if_flags |= IFF_UP;
384
385		switch (ifa->ifa_addr->sa_family) {
386#ifdef	INET
387		case AF_INET:
388			arp_ifinit(ifp, ifa);
389			break;
390#endif
391		default:
392			break;
393		}
394		ofnet_init(of);
395		break;
396	case SIOCSIFFLAGS:
397		if ((ifp->if_flags & IFF_UP) == 0 &&
398		    (ifp->if_flags & IFF_RUNNING) != 0) {
399			/* If interface is down, but running, stop it. */
400			ofnet_stop(of);
401		} else if ((ifp->if_flags & IFF_UP) != 0 &&
402			   (ifp->if_flags & IFF_RUNNING) == 0) {
403			/* If interface is up, but not running, start it. */
404			ofnet_init(of);
405		} else {
406			/* Other flags are ignored. */
407		}
408		break;
409	default:
410		error = EINVAL;
411		break;
412	}
413	return error;
414}
415
416static void
417ofnet_watchdog(struct ifnet *ifp)
418{
419	struct ofnet_softc *of = ifp->if_softc;
420
421	log(LOG_ERR, "%s: device timeout\n", of->sc_dev.dv_xname);
422	ifp->if_oerrors++;
423	ofnet_stop(of);
424	ofnet_init(of);
425}
426
427#if NIPKDB_OFN > 0
428static void
429ipkdbofstart(struct ipkdb_if *kip)
430{
431	int unit = kip->unit - 1;
432
433	if (ipkdb_of)
434		ipkdbattach(kip, &ipkdb_of->sc_ethercom);
435}
436
437static void
438ipkdbofleave(struct ipkdb_if *kip)
439{
440}
441
442static int
443ipkdbofrcv(struct ipkdb_if *kip, u_char *buf, int poll)
444{
445	int l;
446
447	do {
448		l = OF_read(kip->port, buf, ETHERMTU);
449		if (l < 0)
450			l = 0;
451	} while (!poll && !l);
452	return l;
453}
454
455static void
456ipkdbofsend(struct ipkdb_if *kip, u_char *buf, int l)
457{
458	OF_write(kip->port, buf, l);
459}
460
461static int
462ipkdbprobe(struct cfdata *match, void *aux)
463{
464	struct ipkdb_if *kip = aux;
465	static char name[256];
466	int len;
467	int phandle;
468
469	kip->unit = match->cf_unit + 1;
470
471	if (!(kip->port = OF_open("net")))
472		return -1;
473	if ((len = OF_instance_to_path(kip->port, name, sizeof name - 1)) < 0 ||
474	    len >= sizeof name)
475		return -1;
476	name[len] = 0;
477	if ((phandle = OF_instance_to_package(kip->port)) == -1)
478		return -1;
479	if (OF_getprop(phandle, "mac-address", kip->myenetaddr,
480	    sizeof kip->myenetaddr) < 0)
481		return -1;
482
483	kip->flags |= IPKDB_MYHW;
484	kip->name = name;
485	kip->start = ipkdbofstart;
486	kip->leave = ipkdbofleave;
487	kip->receive = ipkdbofrcv;
488	kip->send = ipkdbofsend;
489
490	kifp = kip;
491
492	return 0;
493}
494#endif
495