Commit | Line | Data |
---|---|---|
92e67171 | 1 | /* if_pcl.c 6.1 83/07/29 */ |
f5a868d6 SL |
2 | |
3 | #include "pcl.h" | |
4 | #if NPCL > 0 | |
5 | /* | |
6 | * DEC CSS PCL-11B Parallel Communications Interface | |
7 | * | |
e99dc359 | 8 | * Written by Mike Muuss and Jeff Schwab. |
f5a868d6 SL |
9 | */ |
10 | #include "../machine/pte.h" | |
11 | ||
12 | #include "../h/param.h" | |
13 | #include "../h/systm.h" | |
14 | #include "../h/mbuf.h" | |
15 | #include "../h/buf.h" | |
16 | #include "../h/protosw.h" | |
17 | #include "../h/socket.h" | |
18 | #include "../h/vmmac.h" | |
17718098 | 19 | #include "../h/ioctl.h" |
f5a868d6 SL |
20 | #include "../h/errno.h" |
21 | ||
22 | #include "../net/if.h" | |
23 | #include "../net/netisr.h" | |
24 | #include "../net/route.h" | |
25 | #include "../netinet/in.h" | |
26 | #include "../netinet/in_systm.h" | |
27 | #include "../netinet/ip.h" | |
28 | #include "../netinet/ip_var.h" | |
29 | ||
30 | #include "../vax/cpu.h" | |
31 | #include "../vax/mtpr.h" | |
32 | #include "../vaxif/if_pclreg.h" | |
33 | #include "../vaxif/if_uba.h" | |
34 | #include "../vaxuba/ubareg.h" | |
35 | #include "../vaxuba/ubavar.h" | |
36 | ||
37 | /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ | |
e99dc359 SL |
38 | #define PCLMTU (1006) /* Max transmission unit (bytes) */ |
39 | #define PCLMAXTDM 7 /* Max unit number on TDM bus */ | |
f5a868d6 SL |
40 | |
41 | int pclprobe(), pclattach(), pclrint(), pclxint(); | |
17718098 | 42 | int pclinit(), pclioctl(), pcloutput(), pclreset(); |
f5a868d6 SL |
43 | |
44 | struct uba_device *pclinfo[NPCL]; | |
45 | u_short pclstd[] = { 0 }; | |
46 | #define PCLUNIT(x) minor(x) | |
47 | struct uba_driver pcldriver = | |
48 | { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; | |
49 | ||
50 | /* | |
51 | * PCL software status per interface. | |
52 | * | |
53 | * Each interface is referenced by a network interface structure, | |
54 | * sc_if, which the routing code uses to locate the interface. | |
55 | * This structure contains the output queue for the interface, its address, ... | |
56 | * We also have, for each interface, a UBA interface structure, which | |
57 | * contains information about the UNIBUS resources held by the interface: | |
58 | * map registers, buffered data paths, etc. Information is cached in this | |
59 | * structure for use by the if_uba.c routines in running the interface | |
60 | * efficiently. | |
61 | */ | |
62 | struct pcl_softc { | |
63 | struct ifnet sc_if; /* network-visible interface */ | |
64 | struct ifuba sc_ifuba; /* UNIBUS resources */ | |
65 | short sc_oactive; /* is output active? */ | |
66 | short sc_olen; /* length of last output */ | |
67 | short sc_lastdest; /* previous destination */ | |
68 | short sc_odest; /* current xmit destination */ | |
e99dc359 | 69 | short sc_bdest; /* buffer's stated destination */ |
f5a868d6 SL |
70 | short sc_pattern; /* identification pattern */ |
71 | } pcl_softc[NPCL]; | |
72 | ||
73 | /* | |
74 | * Structure of "local header", which only goes between | |
75 | * pcloutput and pclstart. | |
76 | */ | |
77 | struct pcl_header { | |
78 | short pcl_dest; /* Destination PCL station */ | |
79 | }; | |
80 | ||
81 | /* | |
82 | * Do non-DMA output of 1 word to determine presence of interface, | |
83 | * and to find the interupt vector. 1 word messages are a special | |
84 | * case in the receiver routine, and will be discarded. | |
85 | */ | |
86 | pclprobe(reg) | |
87 | caddr_t reg; | |
88 | { | |
89 | register int br, cvec; /* r11, r10 value-result */ | |
90 | register struct pcldevice *addr = (struct pcldevice *)reg; | |
91 | ||
92 | #ifdef lint | |
93 | br = 0; cvec = br; br = cvec; | |
94 | pclrint(0); pclxint(0); | |
95 | #endif | |
96 | addr->pcl_rcr = PCL_RCINIT; | |
97 | addr->pcl_tcr = PCL_TXINIT; | |
98 | addr->pcl_tsba = 0xFFFE; | |
99 | /* going for 01777776 */ | |
100 | addr->pcl_tsbc = -4; /* really short */ | |
101 | addr->pcl_tcr = | |
102 | ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; | |
103 | DELAY(100000); | |
104 | addr->pcl_tcr = PCL_TXINIT; | |
105 | return (sizeof (struct pcldevice)); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Interface exists: make available by filling in network interface | |
110 | * record. System will initialize the interface when it is ready | |
111 | * to accept packets. | |
112 | */ | |
113 | pclattach(ui) | |
114 | struct uba_device *ui; | |
115 | { | |
116 | register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; | |
f5a868d6 SL |
117 | |
118 | sc->sc_if.if_unit = ui->ui_unit; | |
119 | sc->sc_if.if_name = "pcl"; | |
120 | sc->sc_if.if_mtu = PCLMTU; | |
f5a868d6 SL |
121 | sc->sc_if.if_init = pclinit; |
122 | sc->sc_if.if_output = pcloutput; | |
17718098 | 123 | sc->sc_if.if_ioctl = pclioctl; |
f5a868d6 SL |
124 | sc->sc_if.if_reset = pclreset; |
125 | sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; | |
126 | if_attach(&sc->sc_if); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Reset of interface after UNIBUS reset. | |
131 | * If interface is on specified uba, reset its state. | |
132 | */ | |
133 | pclreset(unit, uban) | |
134 | int unit, uban; | |
135 | { | |
136 | register struct uba_device *ui; | |
137 | ||
138 | if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || | |
139 | ui->ui_ubanum != uban) | |
140 | return; | |
141 | printf(" pcl%d", unit); | |
142 | pclinit(unit); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Initialization of interface; clear recorded pending | |
147 | * operations, and reinitialize UNIBUS usage. | |
148 | */ | |
149 | pclinit(unit) | |
150 | int unit; | |
151 | { | |
152 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
153 | register struct uba_device *ui = pclinfo[unit]; | |
154 | register struct pcldevice *addr; | |
17718098 | 155 | struct sockaddr_in *sin; |
f5a868d6 SL |
156 | int s; |
157 | ||
44eb2da3 | 158 | sin = (struct sockaddr_in *)&sc->sc_if.if_addr; |
17718098 SL |
159 | if (sin->sin_addr.s_addr == 0) |
160 | return; | |
f5a868d6 SL |
161 | if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, |
162 | (int)btoc(PCLMTU)) == 0) { | |
163 | printf("pcl%d: can't init\n", unit); | |
164 | sc->sc_if.if_flags &= ~IFF_UP; | |
165 | return; | |
166 | } | |
167 | addr = (struct pcldevice *)ui->ui_addr; | |
168 | addr->pcl_rcr = PCL_RCINIT; | |
169 | addr->pcl_tcr = PCL_TXINIT; | |
170 | ||
171 | /* | |
172 | * Hang a receive and start any | |
173 | * pending writes by faking a transmit complete. | |
174 | */ | |
175 | s = splimp(); | |
176 | addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; | |
177 | addr->pcl_rdbc = -PCLMTU; | |
178 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | | |
179 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
180 | sc->sc_oactive = 0; | |
17718098 | 181 | sc->sc_if.if_flags |= IFF_UP|IFF_RUNNING; |
f5a868d6 SL |
182 | pclstart(unit); |
183 | splx(s); | |
184 | /* Set up routing table entry */ | |
185 | if_rtinit(&sc->sc_if, RTF_UP); | |
186 | } | |
187 | ||
188 | /* | |
189 | * PCL output routine. | |
190 | */ | |
191 | pcloutput(ifp, m, dst) | |
192 | struct ifnet *ifp; | |
193 | struct mbuf *m; | |
194 | struct sockaddr *dst; | |
195 | { | |
44eb2da3 | 196 | int dest, s, error; |
f5a868d6 SL |
197 | struct pcl_header *pclp; |
198 | struct mbuf *m2; | |
199 | ||
200 | switch (dst->sa_family) { | |
201 | ||
202 | #ifdef INET | |
203 | case AF_INET: | |
e99dc359 SL |
204 | dest = in_lnaof(((struct sockaddr_in *)dst)->sin_addr); |
205 | if (dest > PCLMAXTDM) { | |
206 | error = EHOSTUNREACH; | |
207 | goto bad; | |
208 | } | |
f5a868d6 SL |
209 | break; |
210 | #endif | |
211 | default: | |
212 | printf("pcl%d: can't handle af%d\n", ifp->if_unit, | |
213 | dst->sa_family); | |
214 | error = EAFNOSUPPORT; | |
215 | goto bad; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Add pseudo local net header. | |
220 | * Actually, it does not get transmitted, but merely stripped | |
221 | * off and used by the START routine to route the packet. | |
222 | * If no space in first mbuf, allocate another. | |
223 | */ | |
224 | if (m->m_off > MMAXOFF || | |
225 | MMINOFF + sizeof (struct pcl_header) > m->m_off) { | |
226 | m2 = m_get(M_DONTWAIT, MT_HEADER); | |
227 | if (m2 == 0) { | |
228 | error = ENOBUFS; | |
229 | goto bad; | |
230 | } | |
231 | m2->m_next = m; | |
232 | m2->m_off = MMINOFF; | |
233 | m2->m_len = sizeof (struct pcl_header); | |
234 | m = m2; | |
235 | } else { | |
236 | m->m_off -= sizeof (struct pcl_header); | |
237 | m->m_len += sizeof (struct pcl_header); | |
238 | } | |
239 | pclp = mtod(m, struct pcl_header *); | |
240 | pclp->pcl_dest = dest; | |
241 | ||
242 | /* | |
243 | * Queue message on interface, and start output if interface | |
244 | * not yet active. | |
245 | */ | |
246 | s = splimp(); | |
247 | if (IF_QFULL(&ifp->if_snd)) { | |
248 | IF_DROP(&ifp->if_snd); | |
249 | error = ENOBUFS; | |
250 | goto qfull; | |
251 | } | |
252 | IF_ENQUEUE(&ifp->if_snd, m); | |
253 | if (pcl_softc[ifp->if_unit].sc_oactive == 0) | |
254 | pclstart(ifp->if_unit); | |
255 | splx(s); | |
256 | return (0); | |
257 | qfull: | |
258 | splx(s); | |
259 | bad: | |
260 | m_freem(m); | |
261 | return (error); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Start or restart output on interface. | |
266 | * If interface is already active, then this is a retransmit. | |
267 | * If interface is not already active, get another datagram | |
268 | * to send off of the interface queue, and map it to the interface | |
269 | * before starting the output. | |
270 | */ | |
271 | pclstart(dev) | |
272 | dev_t dev; | |
273 | { | |
274 | int unit = PCLUNIT(dev); | |
275 | struct uba_device *ui = pclinfo[unit]; | |
276 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
277 | register struct pcldevice *addr; | |
278 | struct mbuf *m; | |
279 | ||
280 | if (sc->sc_oactive) | |
281 | goto restart; | |
282 | ||
283 | /* | |
284 | * Not already active: dequeue another request | |
285 | * and map it to the UNIBUS. If no more requests, | |
286 | * just return. | |
287 | */ | |
288 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
289 | if (m == 0) { | |
290 | sc->sc_oactive = 0; | |
291 | return; | |
292 | } | |
293 | ||
294 | /* | |
295 | * Pull destination node out of pseudo-local net header. | |
296 | * remove it from outbound data. | |
297 | * Note that if_wubaput calls m_bcopy, which is prepared for | |
298 | * m_len to be 0 in the first mbuf in the chain. | |
299 | */ | |
e99dc359 SL |
300 | sc->sc_bdest = mtod(m, struct pcl_header *)->pcl_dest; |
301 | sc->sc_odest = sc->sc_bdest? sc->sc_bdest: 1; | |
f5a868d6 SL |
302 | m->m_off += sizeof (struct pcl_header); |
303 | m->m_len -= sizeof (struct pcl_header); | |
304 | ||
305 | /* Map out to the DMA area */ | |
306 | sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); | |
307 | ||
308 | restart: | |
309 | /* | |
310 | * Have request mapped to UNIBUS for transmission. | |
e99dc359 | 311 | * Purge any stale data from this BDP, and start the output. |
f5a868d6 SL |
312 | */ |
313 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
314 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); | |
315 | addr = (struct pcldevice *)ui->ui_addr; | |
316 | addr->pcl_tcr = PCL_TXINIT; | |
317 | addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; | |
318 | addr->pcl_tsbc = -sc->sc_olen; | |
319 | ||
320 | /* | |
321 | * RIB (retry if busy) is used on the second and subsequent packets | |
322 | * to a single host, because TCP often wants to transmit multiple | |
323 | * buffers in a row, | |
324 | * and if they are all going to the same place, the second and | |
325 | * subsequent ones may be lost due to receiver not ready again yet. | |
326 | * This can cause serious problems, because the TCP will resend the | |
327 | * whole window, which just repeats the problem. The result is that | |
328 | * a perfectly good link appears not to work unless we take steps here. | |
329 | */ | |
330 | addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
331 | ((sc->sc_odest & 0xF)<<8) | | |
332 | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | | |
333 | (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); | |
334 | sc->sc_lastdest = sc->sc_odest; | |
335 | sc->sc_oactive = 1; | |
336 | } | |
337 | ||
338 | /* | |
339 | * PCL transmitter interrupt. | |
340 | * Start another output if more data to send. | |
341 | */ | |
342 | pclxint(unit) | |
343 | int unit; | |
344 | { | |
345 | register struct uba_device *ui = pclinfo[unit]; | |
346 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
347 | register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; | |
348 | ||
349 | if (sc->sc_oactive == 0) { | |
350 | printf ("pcl%d: stray interrupt\n", unit); | |
351 | return; | |
352 | } | |
353 | if (addr->pcl_tsr & PCL_ERR) { | |
354 | sc->sc_lastdest = 0; /* don't bother with RIB */ | |
355 | if (addr->pcl_tsr & PCL_MSTDWN) { | |
356 | addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; | |
357 | pclstart(unit); /* Retry */ | |
358 | printf("pcl%d: master\n", unit ); | |
359 | return; | |
360 | } | |
e99dc359 SL |
361 | #ifndef PCL_TESTING |
362 | if ((addr->pcl_tsr & (PCL_ERR|PCL_RESPB)) == (PCL_ERR|0)) { | |
363 | ; /* Receiver Offline -- not exactly an error */ | |
364 | } else { | |
365 | #else | |
366 | { | |
367 | #endif | |
f5a868d6 SL |
368 | /* Log as an error */ |
369 | printf("pcl%d: send error, tcr=%b tsr=%b\n", | |
370 | unit, addr->pcl_tcr, PCL_TCSRBITS, | |
371 | addr->pcl_tsr, PCL_TERRBITS); | |
372 | sc->sc_if.if_oerrors++; | |
373 | } | |
374 | } else | |
375 | sc->sc_if.if_opackets++; | |
e99dc359 SL |
376 | if (sc->sc_bdest == 0 && sc->sc_odest < PCLMAXTDM) { |
377 | sc->sc_odest++; /* do next host (broadcast) */ | |
378 | } else { | |
379 | sc->sc_oactive = 0; | |
380 | if (sc->sc_ifuba.ifu_xtofree) { | |
381 | m_freem(sc->sc_ifuba.ifu_xtofree); | |
382 | sc->sc_ifuba.ifu_xtofree = 0; | |
383 | } | |
f5a868d6 SL |
384 | } |
385 | pclstart(unit); | |
386 | } | |
387 | ||
388 | /* | |
389 | * PCL interface receiver interrupt. | |
390 | * If input error just drop packet. | |
391 | */ | |
392 | pclrint(unit) | |
393 | int unit; | |
394 | { | |
395 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
396 | struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; | |
397 | struct mbuf *m; | |
44eb2da3 | 398 | int len; |
f5a868d6 | 399 | register struct ifqueue *inq; |
f5a868d6 SL |
400 | |
401 | sc->sc_if.if_ipackets++; | |
402 | /* | |
403 | * Purge BDP; drop if input error indicated. | |
404 | */ | |
405 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
406 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); | |
407 | if (addr->pcl_rsr & PCL_ERR) { | |
408 | printf("pcl%d: rcv error, rcr=%b rsr=%b\n", | |
409 | unit, addr->pcl_rcr, PCL_RCSRBITS, | |
410 | addr->pcl_rsr, PCL_RERRBITS); | |
411 | sc->sc_if.if_ierrors++; | |
412 | goto setup; | |
413 | } | |
414 | len = PCLMTU + addr->pcl_rdbc; | |
415 | if (len <= 0 || len > PCLMTU) { | |
416 | printf("pcl%d: bad len=%d.\n", unit, len); | |
417 | sc->sc_if.if_ierrors++; | |
418 | goto setup; | |
419 | } | |
420 | ||
421 | /* Really short packets will be part of the startup sequence */ | |
422 | if (len <= 4) { | |
423 | /* Later, do comming-up processing here */ | |
424 | goto setup; /* drop packet */ | |
425 | } | |
426 | ||
427 | /* | |
428 | * Pull packet off interface. | |
429 | */ | |
430 | m = if_rubaget(&sc->sc_ifuba, len, 0); | |
431 | if (m == 0) | |
432 | goto setup; | |
433 | ||
434 | schednetisr(NETISR_IP); | |
435 | inq = &ipintrq; | |
436 | ||
437 | if (IF_QFULL(inq)) { | |
438 | IF_DROP(inq); | |
439 | m_freem(m); | |
440 | } else | |
441 | IF_ENQUEUE(inq, m); | |
442 | setup: | |
443 | /* | |
444 | * Reset for next packet. | |
445 | */ | |
446 | addr->pcl_rcr = PCL_RCINIT; | |
447 | addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; | |
448 | addr->pcl_rdbc = -PCLMTU; | |
449 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
450 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
451 | } | |
17718098 SL |
452 | |
453 | /* | |
454 | * Process an ioctl request. | |
455 | */ | |
456 | pclioctl(ifp, cmd, data) | |
457 | register struct ifnet *ifp; | |
458 | int cmd; | |
459 | caddr_t data; | |
460 | { | |
461 | struct ifreq *ifr = (struct ifreq *)data; | |
462 | struct sockaddr_in *sin; | |
463 | int s = splimp(), error = 0; | |
464 | ||
465 | switch (cmd) { | |
466 | ||
467 | case SIOCSIFADDR: | |
468 | if (ifp->if_flags & IFF_RUNNING) | |
469 | if_rtinit(ifp, -1); /* delete previous route */ | |
470 | sin = (struct sockaddr_in *)&ifr->ifr_addr; | |
44eb2da3 | 471 | ifp->if_addr = *(struct sockaddr *)sin; |
17718098 SL |
472 | ifp->if_net = in_netof(sin->sin_addr); |
473 | ifp->if_host[0] = in_lnaof(sin->sin_addr); | |
e99dc359 SL |
474 | ifp->if_broadaddr = *(struct sockaddr *)sin; |
475 | sin = (struct sockaddr_in *)&ifp->if_broadaddr; | |
476 | sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); | |
477 | ifp->if_flags |= IFF_BROADCAST; | |
17718098 SL |
478 | if (ifp->if_flags & IFF_RUNNING) |
479 | if_rtinit(ifp, RTF_UP); | |
480 | else | |
481 | pclinit(ifp->if_unit); | |
482 | break; | |
483 | ||
484 | default: | |
485 | error = EINVAL; | |
486 | } | |
487 | splx(s); | |
488 | return (error); | |
489 | } | |
f5a868d6 | 490 | #endif |