ofnet.c revision 1.29 
1/*	$NetBSD: ofnet.c,v 1.29 2002/10/02 16:34:34 thorpej 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 1.29 2002/10/02 16:34:34 thorpej 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
70CFATTACH_DECL(ipkdb_ofn, 0,
71    ipkdb_probe, ipkdb_attach, NULL, NULL);
72
73static struct ipkdb_if *kifp;
74static struct ofnet_softc *ipkdb_of;
75
76static int ipkdbprobe (struct cfdata *, void *);
77#endif
78
79struct ofnet_softc {
80	struct device sc_dev;
81	int sc_phandle;
82	int sc_ihandle;
83	struct ethercom sc_ethercom;
84	struct callout sc_callout;
85};
86
87static int ofnet_match (struct device *, struct cfdata *, void *);
88static void ofnet_attach (struct device *, struct device *, void *);
89
90CFATTACH_DECL(ofnet, sizeof(struct ofnet_softc),
91    ofnet_match, ofnet_attach, NULL, NULL);
92
93static void ofnet_read (struct ofnet_softc *);
94static void ofnet_timer (void *);
95static void ofnet_init (struct ofnet_softc *);
96static void ofnet_stop (struct ofnet_softc *);
97
98static void ofnet_start (struct ifnet *);
99static int ofnet_ioctl (struct ifnet *, u_long, caddr_t);
100static void ofnet_watchdog (struct ifnet *);
101
102static int
103ofnet_match(struct device *parent, struct cfdata *match, void *aux)
104{
105	struct ofbus_attach_args *oba = aux;
106	char type[32];
107	int l;
108
109#if NIPKDB_OFN > 0
110	if (!parent)
111		return ipkdbprobe(match, aux);
112#endif
113	if (strcmp(oba->oba_busname, "ofw"))
114		return (0);
115	if ((l = OF_getprop(oba->oba_phandle, "device_type", type,
116	    sizeof type - 1)) < 0)
117		return 0;
118	if (l >= sizeof type)
119		return 0;
120	type[l] = 0;
121	if (strcmp(type, "network"))
122		return 0;
123	return 1;
124}
125
126static void
127ofnet_attach(struct device *parent, struct device *self, void *aux)
128{
129	struct ofnet_softc *of = (void *)self;
130	struct ifnet *ifp = &of->sc_ethercom.ec_if;
131	struct ofbus_attach_args *oba = aux;
132	char path[256];
133	int l;
134	u_int8_t myaddr[ETHER_ADDR_LEN];
135
136	of->sc_phandle = oba->oba_phandle;
137#if NIPKDB_OFN > 0
138	if (kifp &&
139	    kifp->unit - 1 == of->sc_dev.dv_unit &&
140	    OF_instance_to_package(kifp->port) == oba->oba_phandle)  {
141		ipkdb_of = of;
142		of->sc_ihandle = kifp->port;
143	} else
144#endif
145	if ((l = OF_package_to_path(oba->oba_phandle, path,
146	    sizeof path - 1)) < 0 ||
147	    l >= sizeof path ||
148	    (path[l] = 0, !(of->sc_ihandle = OF_open(path))))
149		panic("ofnet_attach: unable to open");
150	if (OF_getprop(oba->oba_phandle, "mac-address", myaddr,
151	    sizeof myaddr) < 0)
152		panic("ofnet_attach: no mac-address");
153	printf(": address %s\n", ether_sprintf(myaddr));
154
155	callout_init(&of->sc_callout);
156
157	bcopy(of->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
158	ifp->if_softc = of;
159	ifp->if_start = ofnet_start;
160	ifp->if_ioctl = ofnet_ioctl;
161	ifp->if_watchdog = ofnet_watchdog;
162	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
163	IFQ_SET_READY(&ifp->if_snd);
164
165	if_attach(ifp);
166	ether_ifattach(ifp, myaddr);
167}
168
169static char buf[ETHERMTU + sizeof(struct ether_header)];
170
171static void
172ofnet_read(struct ofnet_softc *of)
173{
174	struct ifnet *ifp = &of->sc_ethercom.ec_if;
175	struct mbuf *m, **mp, *head;
176	int s, l, len;
177	char *bufp;
178
179	s = splnet();
180#if NIPKDB_OFN > 0
181	ipkdbrint(kifp, ifp);
182#endif
183	for (;;) {
184		if ((len = OF_read(of->sc_ihandle, buf, sizeof buf)) < 0) {
185			if (len == -2 || len == 0)
186				break;
187			ifp->if_ierrors++;
188			continue;
189		}
190		if (len < sizeof(struct ether_header)) {
191			ifp->if_ierrors++;
192			continue;
193		}
194		bufp = buf;
195
196		/* Allocate a header mbuf */
197		MGETHDR(m, M_DONTWAIT, MT_DATA);
198		if (m == 0) {
199			ifp->if_ierrors++;
200			continue;
201		}
202		m->m_pkthdr.rcvif = ifp;
203		m->m_pkthdr.len = len;
204
205		/*
206		 * We don't know if the interface included the FCS
207		 * or not.  For now, assume that it did if we got
208		 * a packet length that looks like it could include
209		 * the FCS.
210 		 *
211		 * XXX Yuck.
212		 */
213
214		if (len > (ETHER_MAX_LEN - ETHER_CRC_LEN))
215			m->m_flags |= M_HASFCS;
216
217		l = MHLEN;
218		head = 0;
219		mp = &head;
220
221		while (len > 0) {
222			if (head) {
223				MGET(m, M_DONTWAIT, MT_DATA);
224				if (m == 0) {
225					ifp->if_ierrors++;
226					m_freem(head);
227					head = 0;
228					break;
229				}
230				l = MLEN;
231			}
232			if (len >= MINCLSIZE) {
233				MCLGET(m, M_DONTWAIT);
234				if ((m->m_flags & M_EXT) == 0) {
235					ifp->if_ierrors++;
236					m_free(m);
237					m_freem(head);
238					head = 0;
239					break;
240				}
241				l = MCLBYTES;
242			}
243
244			/*
245			 * Make sure the data after the Ethernet header
246			 * is aligned.
247			 *
248			 * XXX Assumes the device is an ethernet, but
249			 * XXX then so does other code in this driver.
250			 */
251			if (head == NULL) {
252				caddr_t newdata = (caddr_t)ALIGN(m->m_data +
253				      sizeof(struct ether_header)) -
254				    sizeof(struct ether_header);
255				l -= newdata - m->m_data;
256				m->m_data = newdata;
257			}
258
259			m->m_len = l = min(len, l);
260			bcopy(bufp, mtod(m, char *), l);
261			bufp += l;
262			len -= l;
263			*mp = m;
264			mp = &m->m_next;
265		}
266		if (head == 0)
267			continue;
268
269#if NBPFILTER > 0
270		if (ifp->if_bpf)
271			bpf_mtap(ifp->if_bpf, m);
272#endif
273		ifp->if_ipackets++;
274		(*ifp->if_input)(ifp, head);
275	}
276	splx(s);
277}
278
279static void
280ofnet_timer(arg)
281	void *arg;
282{
283	struct ofnet_softc *of = arg;
284
285	ofnet_read(of);
286	callout_reset(&of->sc_callout, 1, ofnet_timer, of);
287}
288
289static void
290ofnet_init(struct ofnet_softc *of)
291{
292	struct ifnet *ifp = &of->sc_ethercom.ec_if;
293
294	if (ifp->if_flags & IFF_RUNNING)
295		return;
296
297	ifp->if_flags |= IFF_RUNNING;
298	/* Start reading from interface */
299	ofnet_timer(of);
300	/* Attempt to start output */
301	ofnet_start(ifp);
302}
303
304static void
305ofnet_stop(struct ofnet_softc *of)
306{
307	callout_stop(&of->sc_callout);
308	of->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
309}
310
311static void
312ofnet_start(struct ifnet *ifp)
313{
314	struct ofnet_softc *of = ifp->if_softc;
315	struct mbuf *m, *m0;
316	char *bufp;
317	int len;
318
319	if (!(ifp->if_flags & IFF_RUNNING))
320		return;
321
322	for (;;) {
323		/* First try reading any packets */
324		ofnet_read(of);
325
326		/* Now get the first packet on the queue */
327		IFQ_DEQUEUE(&ifp->if_snd, m0);
328		if (!m0)
329			return;
330
331		if (!(m0->m_flags & M_PKTHDR))
332			panic("ofnet_start: no header mbuf");
333		len = m0->m_pkthdr.len;
334
335#if NBPFILTER > 0
336		if (ifp->if_bpf)
337			bpf_mtap(ifp->if_bpf, m0);
338#endif
339
340		if (len > ETHERMTU + sizeof(struct ether_header)) {
341			/* packet too large, toss it */
342			ifp->if_oerrors++;
343			m_freem(m0);
344			continue;
345		}
346
347		for (bufp = buf; (m = m0) != NULL;) {
348			bcopy(mtod(m, char *), bufp, m->m_len);
349			bufp += m->m_len;
350			MFREE(m, m0);
351		}
352
353		/*
354		 * We don't know if the interface will auto-pad for
355		 * us, so make sure it's at least as large as a
356		 * minimum size Ethernet packet.
357		 */
358
359		if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN))
360			len = ETHER_MIN_LEN - ETHER_CRC_LEN;
361		else
362			len = bufp - buf;
363
364		if (OF_write(of->sc_ihandle, buf, len) != len)
365			ifp->if_oerrors++;
366		else
367			ifp->if_opackets++;
368	}
369}
370
371static int
372ofnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
373{
374	struct ofnet_softc *of = ifp->if_softc;
375	struct ifaddr *ifa = (struct ifaddr *)data;
376	/* struct ifreq *ifr = (struct ifreq *)data; */
377	int error = 0;
378
379	switch (cmd) {
380	case SIOCSIFADDR:
381		ifp->if_flags |= IFF_UP;
382
383		switch (ifa->ifa_addr->sa_family) {
384#ifdef	INET
385		case AF_INET:
386			arp_ifinit(ifp, ifa);
387			break;
388#endif
389		default:
390			break;
391		}
392		ofnet_init(of);
393		break;
394	case SIOCSIFFLAGS:
395		if ((ifp->if_flags & IFF_UP) == 0 &&
396		    (ifp->if_flags & IFF_RUNNING) != 0) {
397			/* If interface is down, but running, stop it. */
398			ofnet_stop(of);
399		} else if ((ifp->if_flags & IFF_UP) != 0 &&
400			   (ifp->if_flags & IFF_RUNNING) == 0) {
401			/* If interface is up, but not running, start it. */
402			ofnet_init(of);
403		} else {
404			/* Other flags are ignored. */
405		}
406		break;
407	default:
408		error = EINVAL;
409		break;
410	}
411	return error;
412}
413
414static void
415ofnet_watchdog(struct ifnet *ifp)
416{
417	struct ofnet_softc *of = ifp->if_softc;
418
419	log(LOG_ERR, "%s: device timeout\n", of->sc_dev.dv_xname);
420	ifp->if_oerrors++;
421	ofnet_stop(of);
422	ofnet_init(of);
423}
424
425#if NIPKDB_OFN > 0
426static void
427ipkdbofstart(struct ipkdb_if *kip)
428{
429	int unit = kip->unit - 1;
430
431	if (ipkdb_of)
432		ipkdbattach(kip, &ipkdb_of->sc_ethercom);
433}
434
435static void
436ipkdbofleave(struct ipkdb_if *kip)
437{
438}
439
440static int
441ipkdbofrcv(struct ipkdb_if *kip, u_char *buf, int poll)
442{
443	int l;
444
445	do {
446		l = OF_read(kip->port, buf, ETHERMTU);
447		if (l < 0)
448			l = 0;
449	} while (!poll && !l);
450	return l;
451}
452
453static void
454ipkdbofsend(struct ipkdb_if *kip, u_char *buf, int l)
455{
456	OF_write(kip->port, buf, l);
457}
458
459static int
460ipkdbprobe(struct cfdata *match, void *aux)
461{
462	struct ipkdb_if *kip = aux;
463	static char name[256];
464	int len;
465	int phandle;
466
467	kip->unit = match->cf_unit + 1;
468
469	if (!(kip->port = OF_open("net")))
470		return -1;
471	if ((len = OF_instance_to_path(kip->port, name, sizeof name - 1)) < 0 ||
472	    len >= sizeof name)
473		return -1;
474	name[len] = 0;
475	if ((phandle = OF_instance_to_package(kip->port)) == -1)
476		return -1;
477	if (OF_getprop(phandle, "mac-address", kip->myenetaddr,
478	    sizeof kip->myenetaddr) < 0)
479		return -1;
480
481	kip->flags |= IPKDB_MYHW;
482	kip->name = name;
483	kip->start = ipkdbofstart;
484	kip->leave = ipkdbofleave;
485	kip->receive = ipkdbofrcv;
486	kip->send = ipkdbofsend;
487
488	kifp = kip;
489
490	return 0;
491}
492#endif
493