Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
2eb4e665 | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
da7c5cc6 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
2eb4e665 | 6 | * @(#)if_pcl.c 7.1 (Berkeley) %G% |
da7c5cc6 | 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" | |
67eb6277 | 31 | |
58bca61d | 32 | #ifdef INET |
f5a868d6 SL |
33 | #include "../netinet/in.h" |
34 | #include "../netinet/in_systm.h" | |
58bca61d | 35 | #include "../netinet/in_var.h" |
f5a868d6 | 36 | #include "../netinet/ip.h" |
58bca61d | 37 | #endif |
f5a868d6 SL |
38 | |
39 | #include "../vax/cpu.h" | |
40 | #include "../vax/mtpr.h" | |
a6e960e7 JB |
41 | #include "if_pclreg.h" |
42 | #include "if_uba.h" | |
f5a868d6 SL |
43 | #include "../vaxuba/ubareg.h" |
44 | #include "../vaxuba/ubavar.h" | |
45 | ||
46 | /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ | |
e99dc359 SL |
47 | #define PCLMTU (1006) /* Max transmission unit (bytes) */ |
48 | #define PCLMAXTDM 7 /* Max unit number on TDM bus */ | |
f5a868d6 SL |
49 | |
50 | int pclprobe(), pclattach(), pclrint(), pclxint(); | |
17718098 | 51 | int pclinit(), pclioctl(), pcloutput(), pclreset(); |
f5a868d6 SL |
52 | |
53 | struct uba_device *pclinfo[NPCL]; | |
54 | u_short pclstd[] = { 0 }; | |
55 | #define PCLUNIT(x) minor(x) | |
56 | struct uba_driver pcldriver = | |
57 | { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; | |
58 | ||
59 | /* | |
60 | * PCL software status per interface. | |
61 | * | |
62 | * Each interface is referenced by a network interface structure, | |
63 | * sc_if, which the routing code uses to locate the interface. | |
64 | * This structure contains the output queue for the interface, its address, ... | |
65 | * We also have, for each interface, a UBA interface structure, which | |
66 | * contains information about the UNIBUS resources held by the interface: | |
67 | * map registers, buffered data paths, etc. Information is cached in this | |
68 | * structure for use by the if_uba.c routines in running the interface | |
69 | * efficiently. | |
70 | */ | |
71 | struct pcl_softc { | |
72 | struct ifnet sc_if; /* network-visible interface */ | |
73 | struct ifuba sc_ifuba; /* UNIBUS resources */ | |
74 | short sc_oactive; /* is output active? */ | |
75 | short sc_olen; /* length of last output */ | |
76 | short sc_lastdest; /* previous destination */ | |
77 | short sc_odest; /* current xmit destination */ | |
e99dc359 | 78 | short sc_bdest; /* buffer's stated destination */ |
f5a868d6 SL |
79 | short sc_pattern; /* identification pattern */ |
80 | } pcl_softc[NPCL]; | |
81 | ||
82 | /* | |
83 | * Structure of "local header", which only goes between | |
84 | * pcloutput and pclstart. | |
85 | */ | |
86 | struct pcl_header { | |
87 | short pcl_dest; /* Destination PCL station */ | |
88 | }; | |
89 | ||
90 | /* | |
91 | * Do non-DMA output of 1 word to determine presence of interface, | |
92 | * and to find the interupt vector. 1 word messages are a special | |
93 | * case in the receiver routine, and will be discarded. | |
94 | */ | |
95 | pclprobe(reg) | |
96 | caddr_t reg; | |
97 | { | |
98 | register int br, cvec; /* r11, r10 value-result */ | |
99 | register struct pcldevice *addr = (struct pcldevice *)reg; | |
100 | ||
101 | #ifdef lint | |
102 | br = 0; cvec = br; br = cvec; | |
103 | pclrint(0); pclxint(0); | |
104 | #endif | |
105 | addr->pcl_rcr = PCL_RCINIT; | |
106 | addr->pcl_tcr = PCL_TXINIT; | |
107 | addr->pcl_tsba = 0xFFFE; | |
108 | /* going for 01777776 */ | |
109 | addr->pcl_tsbc = -4; /* really short */ | |
110 | addr->pcl_tcr = | |
111 | ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; | |
112 | DELAY(100000); | |
113 | addr->pcl_tcr = PCL_TXINIT; | |
114 | return (sizeof (struct pcldevice)); | |
115 | } | |
116 | ||
117 | /* | |
118 | * Interface exists: make available by filling in network interface | |
119 | * record. System will initialize the interface when it is ready | |
120 | * to accept packets. | |
121 | */ | |
122 | pclattach(ui) | |
123 | struct uba_device *ui; | |
124 | { | |
125 | register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; | |
f5a868d6 SL |
126 | |
127 | sc->sc_if.if_unit = ui->ui_unit; | |
128 | sc->sc_if.if_name = "pcl"; | |
129 | sc->sc_if.if_mtu = PCLMTU; | |
f5a868d6 SL |
130 | sc->sc_if.if_init = pclinit; |
131 | sc->sc_if.if_output = pcloutput; | |
17718098 | 132 | sc->sc_if.if_ioctl = pclioctl; |
f5a868d6 | 133 | sc->sc_if.if_reset = pclreset; |
b05c393d | 134 | sc->sc_if.if_flags = IFF_BROADCAST; |
f5a868d6 SL |
135 | sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; |
136 | if_attach(&sc->sc_if); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Reset of interface after UNIBUS reset. | |
141 | * If interface is on specified uba, reset its state. | |
142 | */ | |
143 | pclreset(unit, uban) | |
144 | int unit, uban; | |
145 | { | |
146 | register struct uba_device *ui; | |
147 | ||
148 | if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || | |
149 | ui->ui_ubanum != uban) | |
150 | return; | |
151 | printf(" pcl%d", unit); | |
152 | pclinit(unit); | |
153 | } | |
154 | ||
155 | /* | |
156 | * Initialization of interface; clear recorded pending | |
157 | * operations, and reinitialize UNIBUS usage. | |
158 | */ | |
159 | pclinit(unit) | |
160 | int unit; | |
161 | { | |
162 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
163 | register struct uba_device *ui = pclinfo[unit]; | |
164 | register struct pcldevice *addr; | |
165 | int s; | |
166 | ||
b05c393d | 167 | if (sc->sc_if.if_addrlist == (struct ifaddr *)0) |
17718098 | 168 | return; |
f5a868d6 SL |
169 | if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, |
170 | (int)btoc(PCLMTU)) == 0) { | |
171 | printf("pcl%d: can't init\n", unit); | |
b05c393d | 172 | sc->sc_if.if_flags &= ~(IFF_UP | IFF_RUNNING); |
f5a868d6 SL |
173 | return; |
174 | } | |
b05c393d | 175 | sc->sc_if.if_flags |= IFF_RUNNING; |
f5a868d6 SL |
176 | addr = (struct pcldevice *)ui->ui_addr; |
177 | addr->pcl_rcr = PCL_RCINIT; | |
178 | addr->pcl_tcr = PCL_TXINIT; | |
179 | ||
180 | /* | |
181 | * Hang a receive and start any | |
182 | * pending writes by faking a transmit complete. | |
183 | */ | |
184 | s = splimp(); | |
185 | addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; | |
186 | addr->pcl_rdbc = -PCLMTU; | |
187 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | | |
188 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
189 | sc->sc_oactive = 0; | |
f5a868d6 SL |
190 | pclstart(unit); |
191 | splx(s); | |
f5a868d6 SL |
192 | } |
193 | ||
194 | /* | |
195 | * PCL output routine. | |
196 | */ | |
197 | pcloutput(ifp, m, dst) | |
198 | struct ifnet *ifp; | |
199 | struct mbuf *m; | |
200 | struct sockaddr *dst; | |
201 | { | |
44eb2da3 | 202 | int dest, s, error; |
f5a868d6 SL |
203 | struct pcl_header *pclp; |
204 | struct mbuf *m2; | |
205 | ||
206 | switch (dst->sa_family) { | |
207 | ||
208 | #ifdef INET | |
209 | case AF_INET: | |
b05c393d MK |
210 | if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr)) |
211 | dest = 0; | |
212 | else | |
213 | dest = in_lnaof(((struct sockaddr_in *)dst)->sin_addr); | |
e99dc359 SL |
214 | if (dest > PCLMAXTDM) { |
215 | error = EHOSTUNREACH; | |
216 | goto bad; | |
217 | } | |
f5a868d6 SL |
218 | break; |
219 | #endif | |
220 | default: | |
221 | printf("pcl%d: can't handle af%d\n", ifp->if_unit, | |
222 | dst->sa_family); | |
223 | error = EAFNOSUPPORT; | |
224 | goto bad; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Add pseudo local net header. | |
229 | * Actually, it does not get transmitted, but merely stripped | |
230 | * off and used by the START routine to route the packet. | |
231 | * If no space in first mbuf, allocate another. | |
232 | */ | |
233 | if (m->m_off > MMAXOFF || | |
234 | MMINOFF + sizeof (struct pcl_header) > m->m_off) { | |
235 | m2 = m_get(M_DONTWAIT, MT_HEADER); | |
236 | if (m2 == 0) { | |
237 | error = ENOBUFS; | |
238 | goto bad; | |
239 | } | |
240 | m2->m_next = m; | |
241 | m2->m_off = MMINOFF; | |
242 | m2->m_len = sizeof (struct pcl_header); | |
243 | m = m2; | |
244 | } else { | |
245 | m->m_off -= sizeof (struct pcl_header); | |
246 | m->m_len += sizeof (struct pcl_header); | |
247 | } | |
248 | pclp = mtod(m, struct pcl_header *); | |
249 | pclp->pcl_dest = dest; | |
250 | ||
251 | /* | |
252 | * Queue message on interface, and start output if interface | |
253 | * not yet active. | |
254 | */ | |
255 | s = splimp(); | |
256 | if (IF_QFULL(&ifp->if_snd)) { | |
257 | IF_DROP(&ifp->if_snd); | |
258 | error = ENOBUFS; | |
259 | goto qfull; | |
260 | } | |
261 | IF_ENQUEUE(&ifp->if_snd, m); | |
262 | if (pcl_softc[ifp->if_unit].sc_oactive == 0) | |
263 | pclstart(ifp->if_unit); | |
264 | splx(s); | |
265 | return (0); | |
266 | qfull: | |
267 | splx(s); | |
268 | bad: | |
269 | m_freem(m); | |
270 | return (error); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Start or restart output on interface. | |
275 | * If interface is already active, then this is a retransmit. | |
276 | * If interface is not already active, get another datagram | |
277 | * to send off of the interface queue, and map it to the interface | |
278 | * before starting the output. | |
279 | */ | |
280 | pclstart(dev) | |
281 | dev_t dev; | |
282 | { | |
283 | int unit = PCLUNIT(dev); | |
284 | struct uba_device *ui = pclinfo[unit]; | |
285 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
286 | register struct pcldevice *addr; | |
287 | struct mbuf *m; | |
288 | ||
289 | if (sc->sc_oactive) | |
290 | goto restart; | |
291 | ||
292 | /* | |
293 | * Not already active: dequeue another request | |
294 | * and map it to the UNIBUS. If no more requests, | |
295 | * just return. | |
296 | */ | |
297 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
298 | if (m == 0) { | |
299 | sc->sc_oactive = 0; | |
300 | return; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Pull destination node out of pseudo-local net header. | |
305 | * remove it from outbound data. | |
306 | * Note that if_wubaput calls m_bcopy, which is prepared for | |
307 | * m_len to be 0 in the first mbuf in the chain. | |
308 | */ | |
e99dc359 SL |
309 | sc->sc_bdest = mtod(m, struct pcl_header *)->pcl_dest; |
310 | sc->sc_odest = sc->sc_bdest? sc->sc_bdest: 1; | |
f5a868d6 SL |
311 | m->m_off += sizeof (struct pcl_header); |
312 | m->m_len -= sizeof (struct pcl_header); | |
313 | ||
314 | /* Map out to the DMA area */ | |
315 | sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); | |
316 | ||
317 | restart: | |
318 | /* | |
319 | * Have request mapped to UNIBUS for transmission. | |
e99dc359 | 320 | * Purge any stale data from this BDP, and start the output. |
f5a868d6 SL |
321 | */ |
322 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
323 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); | |
324 | addr = (struct pcldevice *)ui->ui_addr; | |
325 | addr->pcl_tcr = PCL_TXINIT; | |
326 | addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; | |
327 | addr->pcl_tsbc = -sc->sc_olen; | |
328 | ||
329 | /* | |
330 | * RIB (retry if busy) is used on the second and subsequent packets | |
331 | * to a single host, because TCP often wants to transmit multiple | |
332 | * buffers in a row, | |
333 | * and if they are all going to the same place, the second and | |
334 | * subsequent ones may be lost due to receiver not ready again yet. | |
335 | * This can cause serious problems, because the TCP will resend the | |
336 | * whole window, which just repeats the problem. The result is that | |
337 | * a perfectly good link appears not to work unless we take steps here. | |
338 | */ | |
339 | addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
340 | ((sc->sc_odest & 0xF)<<8) | | |
341 | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | | |
342 | (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); | |
343 | sc->sc_lastdest = sc->sc_odest; | |
344 | sc->sc_oactive = 1; | |
345 | } | |
346 | ||
347 | /* | |
348 | * PCL transmitter interrupt. | |
349 | * Start another output if more data to send. | |
350 | */ | |
351 | pclxint(unit) | |
352 | int unit; | |
353 | { | |
354 | register struct uba_device *ui = pclinfo[unit]; | |
355 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
356 | register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; | |
357 | ||
358 | if (sc->sc_oactive == 0) { | |
359 | printf ("pcl%d: stray interrupt\n", unit); | |
360 | return; | |
361 | } | |
362 | if (addr->pcl_tsr & PCL_ERR) { | |
363 | sc->sc_lastdest = 0; /* don't bother with RIB */ | |
364 | if (addr->pcl_tsr & PCL_MSTDWN) { | |
365 | addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; | |
366 | pclstart(unit); /* Retry */ | |
367 | printf("pcl%d: master\n", unit ); | |
368 | return; | |
369 | } | |
e99dc359 SL |
370 | #ifndef PCL_TESTING |
371 | if ((addr->pcl_tsr & (PCL_ERR|PCL_RESPB)) == (PCL_ERR|0)) { | |
372 | ; /* Receiver Offline -- not exactly an error */ | |
373 | } else { | |
374 | #else | |
375 | { | |
376 | #endif | |
f5a868d6 SL |
377 | /* Log as an error */ |
378 | printf("pcl%d: send error, tcr=%b tsr=%b\n", | |
379 | unit, addr->pcl_tcr, PCL_TCSRBITS, | |
380 | addr->pcl_tsr, PCL_TERRBITS); | |
381 | sc->sc_if.if_oerrors++; | |
382 | } | |
383 | } else | |
384 | sc->sc_if.if_opackets++; | |
e99dc359 SL |
385 | if (sc->sc_bdest == 0 && sc->sc_odest < PCLMAXTDM) { |
386 | sc->sc_odest++; /* do next host (broadcast) */ | |
387 | } else { | |
388 | sc->sc_oactive = 0; | |
389 | if (sc->sc_ifuba.ifu_xtofree) { | |
390 | m_freem(sc->sc_ifuba.ifu_xtofree); | |
391 | sc->sc_ifuba.ifu_xtofree = 0; | |
392 | } | |
f5a868d6 SL |
393 | } |
394 | pclstart(unit); | |
395 | } | |
396 | ||
397 | /* | |
398 | * PCL interface receiver interrupt. | |
399 | * If input error just drop packet. | |
400 | */ | |
401 | pclrint(unit) | |
402 | int unit; | |
403 | { | |
404 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
405 | struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; | |
406 | struct mbuf *m; | |
44eb2da3 | 407 | int len; |
f5a868d6 | 408 | register struct ifqueue *inq; |
f5a868d6 SL |
409 | |
410 | sc->sc_if.if_ipackets++; | |
411 | /* | |
412 | * Purge BDP; drop if input error indicated. | |
413 | */ | |
414 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
415 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); | |
416 | if (addr->pcl_rsr & PCL_ERR) { | |
417 | printf("pcl%d: rcv error, rcr=%b rsr=%b\n", | |
418 | unit, addr->pcl_rcr, PCL_RCSRBITS, | |
419 | addr->pcl_rsr, PCL_RERRBITS); | |
420 | sc->sc_if.if_ierrors++; | |
421 | goto setup; | |
422 | } | |
423 | len = PCLMTU + addr->pcl_rdbc; | |
424 | if (len <= 0 || len > PCLMTU) { | |
425 | printf("pcl%d: bad len=%d.\n", unit, len); | |
426 | sc->sc_if.if_ierrors++; | |
427 | goto setup; | |
428 | } | |
429 | ||
430 | /* Really short packets will be part of the startup sequence */ | |
431 | if (len <= 4) { | |
432 | /* Later, do comming-up processing here */ | |
433 | goto setup; /* drop packet */ | |
434 | } | |
435 | ||
436 | /* | |
437 | * Pull packet off interface. | |
438 | */ | |
67eb6277 | 439 | m = if_rubaget(&sc->sc_ifuba, len, 0, &sc->sc_if); |
f5a868d6 SL |
440 | if (m == 0) |
441 | goto setup; | |
442 | ||
443 | schednetisr(NETISR_IP); | |
444 | inq = &ipintrq; | |
445 | ||
446 | if (IF_QFULL(inq)) { | |
447 | IF_DROP(inq); | |
448 | m_freem(m); | |
449 | } else | |
450 | IF_ENQUEUE(inq, m); | |
451 | setup: | |
452 | /* | |
453 | * Reset for next packet. | |
454 | */ | |
455 | addr->pcl_rcr = PCL_RCINIT; | |
456 | addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; | |
457 | addr->pcl_rdbc = -PCLMTU; | |
458 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
459 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
460 | } | |
17718098 SL |
461 | |
462 | /* | |
463 | * Process an ioctl request. | |
464 | */ | |
9205905c | 465 | /* ARGSUSED */ |
17718098 SL |
466 | pclioctl(ifp, cmd, data) |
467 | register struct ifnet *ifp; | |
468 | int cmd; | |
469 | caddr_t data; | |
470 | { | |
17718098 SL |
471 | int s = splimp(), error = 0; |
472 | ||
473 | switch (cmd) { | |
474 | ||
475 | case SIOCSIFADDR: | |
67eb6277 | 476 | ifp->if_flags |= IFF_UP; |
b05c393d | 477 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
17718098 SL |
478 | pclinit(ifp->if_unit); |
479 | break; | |
480 | ||
481 | default: | |
482 | error = EINVAL; | |
483 | } | |
484 | splx(s); | |
485 | return (error); | |
486 | } | |
f5a868d6 | 487 | #endif |