Commit | Line | Data |
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da7c5cc6 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)if_pcl.c 6.4 (Berkeley) %G% | |
7 | */ | |
f5a868d6 SL |
8 | |
9 | #include "pcl.h" | |
10 | #if NPCL > 0 | |
11 | /* | |
12 | * DEC CSS PCL-11B Parallel Communications Interface | |
13 | * | |
e99dc359 | 14 | * Written by Mike Muuss and Jeff Schwab. |
f5a868d6 SL |
15 | */ |
16 | #include "../machine/pte.h" | |
17 | ||
a6e960e7 JB |
18 | #include "param.h" |
19 | #include "systm.h" | |
20 | #include "mbuf.h" | |
21 | #include "buf.h" | |
22 | #include "protosw.h" | |
23 | #include "socket.h" | |
24 | #include "vmmac.h" | |
25 | #include "ioctl.h" | |
26 | #include "errno.h" | |
f5a868d6 SL |
27 | |
28 | #include "../net/if.h" | |
29 | #include "../net/netisr.h" | |
30 | #include "../net/route.h" | |
31 | #include "../netinet/in.h" | |
32 | #include "../netinet/in_systm.h" | |
33 | #include "../netinet/ip.h" | |
34 | #include "../netinet/ip_var.h" | |
35 | ||
36 | #include "../vax/cpu.h" | |
37 | #include "../vax/mtpr.h" | |
a6e960e7 JB |
38 | #include "if_pclreg.h" |
39 | #include "if_uba.h" | |
f5a868d6 SL |
40 | #include "../vaxuba/ubareg.h" |
41 | #include "../vaxuba/ubavar.h" | |
42 | ||
43 | /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ | |
e99dc359 SL |
44 | #define PCLMTU (1006) /* Max transmission unit (bytes) */ |
45 | #define PCLMAXTDM 7 /* Max unit number on TDM bus */ | |
f5a868d6 SL |
46 | |
47 | int pclprobe(), pclattach(), pclrint(), pclxint(); | |
17718098 | 48 | int pclinit(), pclioctl(), pcloutput(), pclreset(); |
f5a868d6 SL |
49 | |
50 | struct uba_device *pclinfo[NPCL]; | |
51 | u_short pclstd[] = { 0 }; | |
52 | #define PCLUNIT(x) minor(x) | |
53 | struct uba_driver pcldriver = | |
54 | { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; | |
55 | ||
56 | /* | |
57 | * PCL software status per interface. | |
58 | * | |
59 | * Each interface is referenced by a network interface structure, | |
60 | * sc_if, which the routing code uses to locate the interface. | |
61 | * This structure contains the output queue for the interface, its address, ... | |
62 | * We also have, for each interface, a UBA interface structure, which | |
63 | * contains information about the UNIBUS resources held by the interface: | |
64 | * map registers, buffered data paths, etc. Information is cached in this | |
65 | * structure for use by the if_uba.c routines in running the interface | |
66 | * efficiently. | |
67 | */ | |
68 | struct pcl_softc { | |
69 | struct ifnet sc_if; /* network-visible interface */ | |
70 | struct ifuba sc_ifuba; /* UNIBUS resources */ | |
71 | short sc_oactive; /* is output active? */ | |
72 | short sc_olen; /* length of last output */ | |
73 | short sc_lastdest; /* previous destination */ | |
74 | short sc_odest; /* current xmit destination */ | |
e99dc359 | 75 | short sc_bdest; /* buffer's stated destination */ |
f5a868d6 SL |
76 | short sc_pattern; /* identification pattern */ |
77 | } pcl_softc[NPCL]; | |
78 | ||
79 | /* | |
80 | * Structure of "local header", which only goes between | |
81 | * pcloutput and pclstart. | |
82 | */ | |
83 | struct pcl_header { | |
84 | short pcl_dest; /* Destination PCL station */ | |
85 | }; | |
86 | ||
87 | /* | |
88 | * Do non-DMA output of 1 word to determine presence of interface, | |
89 | * and to find the interupt vector. 1 word messages are a special | |
90 | * case in the receiver routine, and will be discarded. | |
91 | */ | |
92 | pclprobe(reg) | |
93 | caddr_t reg; | |
94 | { | |
95 | register int br, cvec; /* r11, r10 value-result */ | |
96 | register struct pcldevice *addr = (struct pcldevice *)reg; | |
97 | ||
98 | #ifdef lint | |
99 | br = 0; cvec = br; br = cvec; | |
100 | pclrint(0); pclxint(0); | |
101 | #endif | |
102 | addr->pcl_rcr = PCL_RCINIT; | |
103 | addr->pcl_tcr = PCL_TXINIT; | |
104 | addr->pcl_tsba = 0xFFFE; | |
105 | /* going for 01777776 */ | |
106 | addr->pcl_tsbc = -4; /* really short */ | |
107 | addr->pcl_tcr = | |
108 | ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; | |
109 | DELAY(100000); | |
110 | addr->pcl_tcr = PCL_TXINIT; | |
111 | return (sizeof (struct pcldevice)); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Interface exists: make available by filling in network interface | |
116 | * record. System will initialize the interface when it is ready | |
117 | * to accept packets. | |
118 | */ | |
119 | pclattach(ui) | |
120 | struct uba_device *ui; | |
121 | { | |
122 | register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; | |
f5a868d6 SL |
123 | |
124 | sc->sc_if.if_unit = ui->ui_unit; | |
125 | sc->sc_if.if_name = "pcl"; | |
126 | sc->sc_if.if_mtu = PCLMTU; | |
f5a868d6 SL |
127 | sc->sc_if.if_init = pclinit; |
128 | sc->sc_if.if_output = pcloutput; | |
17718098 | 129 | sc->sc_if.if_ioctl = pclioctl; |
f5a868d6 | 130 | sc->sc_if.if_reset = pclreset; |
b05c393d | 131 | sc->sc_if.if_flags = IFF_BROADCAST; |
f5a868d6 SL |
132 | sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; |
133 | if_attach(&sc->sc_if); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Reset of interface after UNIBUS reset. | |
138 | * If interface is on specified uba, reset its state. | |
139 | */ | |
140 | pclreset(unit, uban) | |
141 | int unit, uban; | |
142 | { | |
143 | register struct uba_device *ui; | |
144 | ||
145 | if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || | |
146 | ui->ui_ubanum != uban) | |
147 | return; | |
148 | printf(" pcl%d", unit); | |
149 | pclinit(unit); | |
150 | } | |
151 | ||
152 | /* | |
153 | * Initialization of interface; clear recorded pending | |
154 | * operations, and reinitialize UNIBUS usage. | |
155 | */ | |
156 | pclinit(unit) | |
157 | int unit; | |
158 | { | |
159 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
160 | register struct uba_device *ui = pclinfo[unit]; | |
161 | register struct pcldevice *addr; | |
162 | int s; | |
163 | ||
b05c393d | 164 | if (sc->sc_if.if_addrlist == (struct ifaddr *)0) |
17718098 | 165 | return; |
f5a868d6 SL |
166 | if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, |
167 | (int)btoc(PCLMTU)) == 0) { | |
168 | printf("pcl%d: can't init\n", unit); | |
b05c393d | 169 | sc->sc_if.if_flags &= ~(IFF_UP | IFF_RUNNING); |
f5a868d6 SL |
170 | return; |
171 | } | |
b05c393d | 172 | sc->sc_if.if_flags |= IFF_RUNNING; |
f5a868d6 SL |
173 | addr = (struct pcldevice *)ui->ui_addr; |
174 | addr->pcl_rcr = PCL_RCINIT; | |
175 | addr->pcl_tcr = PCL_TXINIT; | |
176 | ||
177 | /* | |
178 | * Hang a receive and start any | |
179 | * pending writes by faking a transmit complete. | |
180 | */ | |
181 | s = splimp(); | |
182 | addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; | |
183 | addr->pcl_rdbc = -PCLMTU; | |
184 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | | |
185 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
186 | sc->sc_oactive = 0; | |
f5a868d6 SL |
187 | pclstart(unit); |
188 | splx(s); | |
f5a868d6 SL |
189 | } |
190 | ||
191 | /* | |
192 | * PCL output routine. | |
193 | */ | |
194 | pcloutput(ifp, m, dst) | |
195 | struct ifnet *ifp; | |
196 | struct mbuf *m; | |
197 | struct sockaddr *dst; | |
198 | { | |
44eb2da3 | 199 | int dest, s, error; |
f5a868d6 SL |
200 | struct pcl_header *pclp; |
201 | struct mbuf *m2; | |
202 | ||
203 | switch (dst->sa_family) { | |
204 | ||
205 | #ifdef INET | |
206 | case AF_INET: | |
b05c393d MK |
207 | if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr)) |
208 | dest = 0; | |
209 | else | |
210 | dest = in_lnaof(((struct sockaddr_in *)dst)->sin_addr); | |
e99dc359 SL |
211 | if (dest > PCLMAXTDM) { |
212 | error = EHOSTUNREACH; | |
213 | goto bad; | |
214 | } | |
f5a868d6 SL |
215 | break; |
216 | #endif | |
217 | default: | |
218 | printf("pcl%d: can't handle af%d\n", ifp->if_unit, | |
219 | dst->sa_family); | |
220 | error = EAFNOSUPPORT; | |
221 | goto bad; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Add pseudo local net header. | |
226 | * Actually, it does not get transmitted, but merely stripped | |
227 | * off and used by the START routine to route the packet. | |
228 | * If no space in first mbuf, allocate another. | |
229 | */ | |
230 | if (m->m_off > MMAXOFF || | |
231 | MMINOFF + sizeof (struct pcl_header) > m->m_off) { | |
232 | m2 = m_get(M_DONTWAIT, MT_HEADER); | |
233 | if (m2 == 0) { | |
234 | error = ENOBUFS; | |
235 | goto bad; | |
236 | } | |
237 | m2->m_next = m; | |
238 | m2->m_off = MMINOFF; | |
239 | m2->m_len = sizeof (struct pcl_header); | |
240 | m = m2; | |
241 | } else { | |
242 | m->m_off -= sizeof (struct pcl_header); | |
243 | m->m_len += sizeof (struct pcl_header); | |
244 | } | |
245 | pclp = mtod(m, struct pcl_header *); | |
246 | pclp->pcl_dest = dest; | |
247 | ||
248 | /* | |
249 | * Queue message on interface, and start output if interface | |
250 | * not yet active. | |
251 | */ | |
252 | s = splimp(); | |
253 | if (IF_QFULL(&ifp->if_snd)) { | |
254 | IF_DROP(&ifp->if_snd); | |
255 | error = ENOBUFS; | |
256 | goto qfull; | |
257 | } | |
258 | IF_ENQUEUE(&ifp->if_snd, m); | |
259 | if (pcl_softc[ifp->if_unit].sc_oactive == 0) | |
260 | pclstart(ifp->if_unit); | |
261 | splx(s); | |
262 | return (0); | |
263 | qfull: | |
264 | splx(s); | |
265 | bad: | |
266 | m_freem(m); | |
267 | return (error); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Start or restart output on interface. | |
272 | * If interface is already active, then this is a retransmit. | |
273 | * If interface is not already active, get another datagram | |
274 | * to send off of the interface queue, and map it to the interface | |
275 | * before starting the output. | |
276 | */ | |
277 | pclstart(dev) | |
278 | dev_t dev; | |
279 | { | |
280 | int unit = PCLUNIT(dev); | |
281 | struct uba_device *ui = pclinfo[unit]; | |
282 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
283 | register struct pcldevice *addr; | |
284 | struct mbuf *m; | |
285 | ||
286 | if (sc->sc_oactive) | |
287 | goto restart; | |
288 | ||
289 | /* | |
290 | * Not already active: dequeue another request | |
291 | * and map it to the UNIBUS. If no more requests, | |
292 | * just return. | |
293 | */ | |
294 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
295 | if (m == 0) { | |
296 | sc->sc_oactive = 0; | |
297 | return; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Pull destination node out of pseudo-local net header. | |
302 | * remove it from outbound data. | |
303 | * Note that if_wubaput calls m_bcopy, which is prepared for | |
304 | * m_len to be 0 in the first mbuf in the chain. | |
305 | */ | |
e99dc359 SL |
306 | sc->sc_bdest = mtod(m, struct pcl_header *)->pcl_dest; |
307 | sc->sc_odest = sc->sc_bdest? sc->sc_bdest: 1; | |
f5a868d6 SL |
308 | m->m_off += sizeof (struct pcl_header); |
309 | m->m_len -= sizeof (struct pcl_header); | |
310 | ||
311 | /* Map out to the DMA area */ | |
312 | sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); | |
313 | ||
314 | restart: | |
315 | /* | |
316 | * Have request mapped to UNIBUS for transmission. | |
e99dc359 | 317 | * Purge any stale data from this BDP, and start the output. |
f5a868d6 SL |
318 | */ |
319 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
320 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); | |
321 | addr = (struct pcldevice *)ui->ui_addr; | |
322 | addr->pcl_tcr = PCL_TXINIT; | |
323 | addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; | |
324 | addr->pcl_tsbc = -sc->sc_olen; | |
325 | ||
326 | /* | |
327 | * RIB (retry if busy) is used on the second and subsequent packets | |
328 | * to a single host, because TCP often wants to transmit multiple | |
329 | * buffers in a row, | |
330 | * and if they are all going to the same place, the second and | |
331 | * subsequent ones may be lost due to receiver not ready again yet. | |
332 | * This can cause serious problems, because the TCP will resend the | |
333 | * whole window, which just repeats the problem. The result is that | |
334 | * a perfectly good link appears not to work unless we take steps here. | |
335 | */ | |
336 | addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
337 | ((sc->sc_odest & 0xF)<<8) | | |
338 | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | | |
339 | (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); | |
340 | sc->sc_lastdest = sc->sc_odest; | |
341 | sc->sc_oactive = 1; | |
342 | } | |
343 | ||
344 | /* | |
345 | * PCL transmitter interrupt. | |
346 | * Start another output if more data to send. | |
347 | */ | |
348 | pclxint(unit) | |
349 | int unit; | |
350 | { | |
351 | register struct uba_device *ui = pclinfo[unit]; | |
352 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
353 | register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; | |
354 | ||
355 | if (sc->sc_oactive == 0) { | |
356 | printf ("pcl%d: stray interrupt\n", unit); | |
357 | return; | |
358 | } | |
359 | if (addr->pcl_tsr & PCL_ERR) { | |
360 | sc->sc_lastdest = 0; /* don't bother with RIB */ | |
361 | if (addr->pcl_tsr & PCL_MSTDWN) { | |
362 | addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; | |
363 | pclstart(unit); /* Retry */ | |
364 | printf("pcl%d: master\n", unit ); | |
365 | return; | |
366 | } | |
e99dc359 SL |
367 | #ifndef PCL_TESTING |
368 | if ((addr->pcl_tsr & (PCL_ERR|PCL_RESPB)) == (PCL_ERR|0)) { | |
369 | ; /* Receiver Offline -- not exactly an error */ | |
370 | } else { | |
371 | #else | |
372 | { | |
373 | #endif | |
f5a868d6 SL |
374 | /* Log as an error */ |
375 | printf("pcl%d: send error, tcr=%b tsr=%b\n", | |
376 | unit, addr->pcl_tcr, PCL_TCSRBITS, | |
377 | addr->pcl_tsr, PCL_TERRBITS); | |
378 | sc->sc_if.if_oerrors++; | |
379 | } | |
380 | } else | |
381 | sc->sc_if.if_opackets++; | |
e99dc359 SL |
382 | if (sc->sc_bdest == 0 && sc->sc_odest < PCLMAXTDM) { |
383 | sc->sc_odest++; /* do next host (broadcast) */ | |
384 | } else { | |
385 | sc->sc_oactive = 0; | |
386 | if (sc->sc_ifuba.ifu_xtofree) { | |
387 | m_freem(sc->sc_ifuba.ifu_xtofree); | |
388 | sc->sc_ifuba.ifu_xtofree = 0; | |
389 | } | |
f5a868d6 SL |
390 | } |
391 | pclstart(unit); | |
392 | } | |
393 | ||
394 | /* | |
395 | * PCL interface receiver interrupt. | |
396 | * If input error just drop packet. | |
397 | */ | |
398 | pclrint(unit) | |
399 | int unit; | |
400 | { | |
401 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
402 | struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; | |
403 | struct mbuf *m; | |
44eb2da3 | 404 | int len; |
f5a868d6 | 405 | register struct ifqueue *inq; |
f5a868d6 SL |
406 | |
407 | sc->sc_if.if_ipackets++; | |
408 | /* | |
409 | * Purge BDP; drop if input error indicated. | |
410 | */ | |
411 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
412 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); | |
413 | if (addr->pcl_rsr & PCL_ERR) { | |
414 | printf("pcl%d: rcv error, rcr=%b rsr=%b\n", | |
415 | unit, addr->pcl_rcr, PCL_RCSRBITS, | |
416 | addr->pcl_rsr, PCL_RERRBITS); | |
417 | sc->sc_if.if_ierrors++; | |
418 | goto setup; | |
419 | } | |
420 | len = PCLMTU + addr->pcl_rdbc; | |
421 | if (len <= 0 || len > PCLMTU) { | |
422 | printf("pcl%d: bad len=%d.\n", unit, len); | |
423 | sc->sc_if.if_ierrors++; | |
424 | goto setup; | |
425 | } | |
426 | ||
427 | /* Really short packets will be part of the startup sequence */ | |
428 | if (len <= 4) { | |
429 | /* Later, do comming-up processing here */ | |
430 | goto setup; /* drop packet */ | |
431 | } | |
432 | ||
433 | /* | |
434 | * Pull packet off interface. | |
435 | */ | |
436 | m = if_rubaget(&sc->sc_ifuba, len, 0); | |
437 | if (m == 0) | |
438 | goto setup; | |
439 | ||
440 | schednetisr(NETISR_IP); | |
441 | inq = &ipintrq; | |
442 | ||
443 | if (IF_QFULL(inq)) { | |
444 | IF_DROP(inq); | |
445 | m_freem(m); | |
446 | } else | |
447 | IF_ENQUEUE(inq, m); | |
448 | setup: | |
449 | /* | |
450 | * Reset for next packet. | |
451 | */ | |
452 | addr->pcl_rcr = PCL_RCINIT; | |
453 | addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; | |
454 | addr->pcl_rdbc = -PCLMTU; | |
455 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
456 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
457 | } | |
17718098 SL |
458 | |
459 | /* | |
460 | * Process an ioctl request. | |
461 | */ | |
462 | pclioctl(ifp, cmd, data) | |
463 | register struct ifnet *ifp; | |
464 | int cmd; | |
465 | caddr_t data; | |
466 | { | |
17718098 SL |
467 | int s = splimp(), error = 0; |
468 | ||
469 | switch (cmd) { | |
470 | ||
471 | case SIOCSIFADDR: | |
b05c393d | 472 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
17718098 | 473 | pclinit(ifp->if_unit); |
b05c393d | 474 | ifp->if_flags |= IFF_UP; |
17718098 SL |
475 | break; |
476 | ||
477 | default: | |
478 | error = EINVAL; | |
479 | } | |
480 | splx(s); | |
481 | return (error); | |
482 | } | |
f5a868d6 | 483 | #endif |