ofnet.c revision 1.23 
1/*	$NetBSD: ofnet.c,v 1.23 2001/11/13 07:26:28 lukem 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 1.23 2001/11/13 07:26:28 lukem 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
166	if_attach(ifp);
167	ether_ifattach(ifp, myaddr);
168
169#ifdef __BROKEN_DK_ESTABLISH
170	dk_establish(0, self);					/* XXX */
171#endif
172}
173
174static char buf[ETHERMTU + sizeof(struct ether_header)];
175
176static void
177ofnet_read(struct ofnet_softc *of)
178{
179	struct ifnet *ifp = &of->sc_ethercom.ec_if;
180	struct mbuf *m, **mp, *head;
181	int l, len;
182	char *bufp;
183
184#if NIPKDB_OFN > 0
185	ipkdbrint(kifp, ifp);
186#endif
187	while (1) {
188		if ((len = OF_read(of->sc_ihandle, buf, sizeof buf)) < 0) {
189			if (len == -2 || len == 0)
190				return;
191			ifp->if_ierrors++;
192			continue;
193		}
194		if (len < sizeof(struct ether_header)) {
195			ifp->if_ierrors++;
196			continue;
197		}
198		bufp = buf;
199
200		/* Allocate a header mbuf */
201		MGETHDR(m, M_DONTWAIT, MT_DATA);
202		if (m == 0) {
203			ifp->if_ierrors++;
204			continue;
205		}
206		m->m_pkthdr.rcvif = ifp;
207		m->m_pkthdr.len = len;
208
209		/*
210		 * We don't know if the interface included the FCS
211		 * or not.  For now, assume that it did if we got
212		 * a packet length that looks like it could include
213		 * the FCS.
214 		 *
215		 * XXX Yuck.
216		 */
217
218		if (len > (ETHER_MAX_LEN - ETHER_CRC_LEN))
219			m->m_flags |= M_HASFCS;
220
221		l = MHLEN;
222		head = 0;
223		mp = &head;
224
225		while (len > 0) {
226			if (head) {
227				MGET(m, M_DONTWAIT, MT_DATA);
228				if (m == 0) {
229					ifp->if_ierrors++;
230					m_freem(head);
231					head = 0;
232					break;
233				}
234				l = MLEN;
235			}
236			if (len >= MINCLSIZE) {
237				MCLGET(m, M_DONTWAIT);
238				if ((m->m_flags & M_EXT) == 0) {
239					ifp->if_ierrors++;
240					m_free(m);
241					m_freem(head);
242					head = 0;
243					break;
244				}
245				l = MCLBYTES;
246			}
247
248			/*
249			 * Make sure the data after the Ethernet header
250			 * is aligned.
251			 *
252			 * XXX Assumes the device is an ethernet, but
253			 * XXX then so does other code in this driver.
254			 */
255			if (head == NULL) {
256				caddr_t newdata = (caddr_t)ALIGN(m->m_data +
257				      sizeof(struct ether_header)) -
258				    sizeof(struct ether_header);
259				l -= newdata - m->m_data;
260				m->m_data = newdata;
261			}
262
263			m->m_len = l = min(len, l);
264			bcopy(bufp, mtod(m, char *), l);
265			bufp += l;
266			len -= l;
267			*mp = m;
268			mp = &m->m_next;
269		}
270		if (head == 0)
271			continue;
272
273#if NBPFILTER > 0
274		if (ifp->if_bpf)
275			bpf_mtap(ifp->if_bpf, m);
276#endif
277		ifp->if_ipackets++;
278		(*ifp->if_input)(ifp, head);
279	}
280}
281
282static void
283ofnet_timer(arg)
284	void *arg;
285{
286	struct ofnet_softc *of = arg;
287
288	ofnet_read(of);
289	callout_reset(&of->sc_callout, 1, ofnet_timer, of);
290}
291
292static void
293ofnet_init(struct ofnet_softc *of)
294{
295	struct ifnet *ifp = &of->sc_ethercom.ec_if;
296
297	if (ifp->if_flags & IFF_RUNNING)
298		return;
299
300	ifp->if_flags |= IFF_RUNNING;
301	/* Start reading from interface */
302	ofnet_timer(of);
303	/* Attempt to start output */
304	ofnet_start(ifp);
305}
306
307static void
308ofnet_stop(struct ofnet_softc *of)
309{
310	callout_stop(&of->sc_callout);
311	of->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
312}
313
314static void
315ofnet_start(struct ifnet *ifp)
316{
317	struct ofnet_softc *of = ifp->if_softc;
318	struct mbuf *m, *m0;
319	char *bufp;
320	int len;
321
322	if (!(ifp->if_flags & IFF_RUNNING))
323		return;
324
325	for (;;) {
326		/* First try reading any packets */
327		ofnet_read(of);
328
329		/* Now get the first packet on the queue */
330		IF_DEQUEUE(&ifp->if_snd, m0);
331		if (!m0)
332			return;
333
334		if (!(m0->m_flags & M_PKTHDR))
335			panic("ofnet_start: no header mbuf");
336		len = m0->m_pkthdr.len;
337
338#if NBPFILTER > 0
339		if (ifp->if_bpf)
340			bpf_mtap(ifp->if_bpf, m0);
341#endif
342
343		if (len > ETHERMTU + sizeof(struct ether_header)) {
344			/* packet too large, toss it */
345			ifp->if_oerrors++;
346			m_freem(m0);
347			continue;
348		}
349
350		for (bufp = buf; (m = m0) != NULL;) {
351			bcopy(mtod(m, char *), bufp, m->m_len);
352			bufp += m->m_len;
353			MFREE(m, m0);
354		}
355
356		/*
357		 * We don't know if the interface will auto-pad for
358		 * us, so make sure it's at least as large as a
359		 * minimum size Ethernet packet.
360		 */
361
362		if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN))
363			len = ETHER_MIN_LEN - ETHER_CRC_LEN;
364		else
365			len = bufp - buf;
366
367		if (OF_write(of->sc_ihandle, buf, len) != len)
368			ifp->if_oerrors++;
369		else
370			ifp->if_opackets++;
371	}
372}
373
374static int
375ofnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
376{
377	struct ofnet_softc *of = ifp->if_softc;
378	struct ifaddr *ifa = (struct ifaddr *)data;
379	/* struct ifreq *ifr = (struct ifreq *)data; */
380	int error = 0;
381
382	switch (cmd) {
383	case SIOCSIFADDR:
384		ifp->if_flags |= IFF_UP;
385
386		switch (ifa->ifa_addr->sa_family) {
387#ifdef	INET
388		case AF_INET:
389			arp_ifinit(ifp, ifa);
390			break;
391#endif
392		default:
393			break;
394		}
395		ofnet_init(of);
396		break;
397	case SIOCSIFFLAGS:
398		if ((ifp->if_flags & IFF_UP) == 0 &&
399		    (ifp->if_flags & IFF_RUNNING) != 0) {
400			/* If interface is down, but running, stop it. */
401			ofnet_stop(of);
402		} else if ((ifp->if_flags & IFF_UP) != 0 &&
403			   (ifp->if_flags & IFF_RUNNING) == 0) {
404			/* If interface is up, but not running, start it. */
405			ofnet_init(of);
406		} else {
407			/* Other flags are ignored. */
408		}
409		break;
410	default:
411		error = EINVAL;
412		break;
413	}
414	return error;
415}
416
417static void
418ofnet_watchdog(struct ifnet *ifp)
419{
420	struct ofnet_softc *of = ifp->if_softc;
421
422	log(LOG_ERR, "%s: device timeout\n", of->sc_dev.dv_xname);
423	ifp->if_oerrors++;
424	ofnet_stop(of);
425	ofnet_init(of);
426}
427
428#if NIPKDB_OFN > 0
429static void
430ipkdbofstart(struct ipkdb_if *kip)
431{
432	int unit = kip->unit - 1;
433
434	if (ipkdb_of)
435		ipkdbattach(kip, &ipkdb_of->sc_ethercom);
436}
437
438static void
439ipkdbofleave(struct ipkdb_if *kip)
440{
441}
442
443static int
444ipkdbofrcv(struct ipkdb_if *kip, u_char *buf, int poll)
445{
446	int l;
447
448	do {
449		l = OF_read(kip->port, buf, ETHERMTU);
450		if (l < 0)
451			l = 0;
452	} while (!poll && !l);
453	return l;
454}
455
456static void
457ipkdbofsend(struct ipkdb_if *kip, u_char *buf, int l)
458{
459	OF_write(kip->port, buf, l);
460}
461
462static int
463ipkdbprobe(struct cfdata *match, void *aux)
464{
465	struct ipkdb_if *kip = aux;
466	static char name[256];
467	int len;
468	int phandle;
469
470	kip->unit = match->cf_unit + 1;
471
472	if (!(kip->port = OF_open("net")))
473		return -1;
474	if ((len = OF_instance_to_path(kip->port, name, sizeof name - 1)) < 0 ||
475	    len >= sizeof name)
476		return -1;
477	name[len] = 0;
478	if ((phandle = OF_instance_to_package(kip->port)) == -1)
479		return -1;
480	if (OF_getprop(phandle, "mac-address", kip->myenetaddr,
481	    sizeof kip->myenetaddr) < 0)
482		return -1;
483
484	kip->flags |= IPKDB_MYHW;
485	kip->name = name;
486	kip->start = ipkdbofstart;
487	kip->leave = ipkdbofleave;
488	kip->receive = ipkdbofrcv;
489	kip->send = ipkdbofsend;
490
491	kifp = kip;
492
493	return 0;
494}
495#endif
496