Commit | Line | Data |
---|---|---|
f1b2fa5b | 1 | /* if_en.c 4.15 81/11/29 */ |
11720282 BJ |
2 | |
3 | #include "en.h" | |
f1b2fa5b | 4 | |
11720282 | 5 | /* |
f1b2fa5b | 6 | * Xerox prototype (3 Mb) Ethernet interface driver. |
11720282 BJ |
7 | */ |
8 | ||
9 | #include "../h/param.h" | |
10 | #include "../h/systm.h" | |
11 | #include "../h/mbuf.h" | |
11720282 BJ |
12 | #include "../h/pte.h" |
13 | #include "../h/buf.h" | |
8a13b737 BJ |
14 | #include "../h/protosw.h" |
15 | #include "../h/socket.h" | |
11720282 BJ |
16 | #include "../h/ubareg.h" |
17 | #include "../h/ubavar.h" | |
11720282 | 18 | #include "../h/enreg.h" |
11720282 | 19 | #include "../h/cpu.h" |
8a13b737 BJ |
20 | #include "../h/mtpr.h" |
21 | #include "../h/vmmac.h" | |
22 | #include "../net/in.h" | |
23 | #include "../net/in_systm.h" | |
24 | #include "../net/if.h" | |
25 | #include "../net/if_en.h" | |
26 | #include "../net/if_uba.h" | |
27 | #include "../net/ip.h" | |
28 | #include "../net/ip_var.h" | |
29 | ||
30 | #define ENMTU 1024 | |
11720282 | 31 | |
11720282 BJ |
32 | int enprobe(), enattach(), enrint(), enxint(), encollide(); |
33 | struct uba_device *eninfo[NEN]; | |
34 | u_short enstd[] = { 0 }; | |
35 | struct uba_driver endriver = | |
8a13b737 | 36 | { enprobe, 0, enattach, 0, enstd, "es", eninfo }; |
11720282 BJ |
37 | #define ENUNIT(x) minor(x) |
38 | ||
f1b2fa5b BJ |
39 | int eninit(),enoutput(),enreset(); |
40 | ||
41 | /* | |
42 | * Ethernet software status per interface. | |
43 | * | |
44 | * Each interface is referenced by a network interface structure, | |
45 | * es_if, which the routing code uses to locate the interface. | |
46 | * This structure contains the output queue for the interface, its address, ... | |
47 | * We also have, for each interface, a UBA interface structure, which | |
48 | * contains information about the UNIBUS resources held by the interface: | |
49 | * map registers, buffered data paths, etc. Information is cached in this | |
50 | * structure for use by the if_uba.c routines in running the interface | |
51 | * efficiently. | |
52 | */ | |
8a13b737 | 53 | struct en_softc { |
f1b2fa5b BJ |
54 | struct ifnet es_if; /* network-visible interface */ |
55 | struct ifuba es_ifuba; /* UNIBUS resources */ | |
56 | short es_delay; /* current output delay */ | |
57 | short es_mask; /* mask for current output delay */ | |
58 | u_char es_lastx; /* host last transmitted to */ | |
59 | short es_oactive; /* is output active? */ | |
60 | short es_olen; /* length of last output */ | |
8a13b737 | 61 | } en_softc[NEN]; |
11720282 | 62 | |
f1b2fa5b BJ |
63 | /* |
64 | * Do output DMA to determine interface presence and | |
65 | * interrupt vector. DMA is too short to disturb other hosts. | |
66 | */ | |
11720282 BJ |
67 | enprobe(reg) |
68 | caddr_t reg; | |
69 | { | |
70 | register int br, cvec; | |
71 | register struct endevice *addr = (struct endevice *)reg; | |
72 | ||
8a13b737 | 73 | COUNT(ENPROBE); |
11720282 BJ |
74 | #ifdef lint |
75 | br = 0; cvec = br; br = cvec; | |
2b4b57cd | 76 | enrint(0); enxint(0); encollide(0); |
11720282 | 77 | #endif |
11720282 | 78 | addr->en_istat = 0; |
11720282 BJ |
79 | addr->en_owc = -1; |
80 | addr->en_oba = 0; | |
941ee7ef | 81 | addr->en_ostat = EN_IEN|EN_GO; |
11720282 BJ |
82 | DELAY(100000); |
83 | addr->en_ostat = 0; | |
11720282 BJ |
84 | return (1); |
85 | } | |
86 | ||
f1b2fa5b BJ |
87 | /* |
88 | * Interface exists: make available by filling in network interface | |
89 | * record. System will initialize the interface when it is ready | |
90 | * to accept packets. | |
91 | */ | |
11720282 BJ |
92 | enattach(ui) |
93 | struct uba_device *ui; | |
94 | { | |
f1b2fa5b | 95 | register struct en_softc *es = &en_softc[ui->ui_unit]; |
8a13b737 | 96 | COUNT(ENATTACH); |
f1b2fa5b BJ |
97 | |
98 | es->es_if.if_unit = ui->ui_unit; | |
99 | es->es_if.if_mtu = ENMTU; | |
100 | es->es_if.if_net = ui->ui_flags; | |
101 | es->es_if.if_host[0] = | |
102 | ~(((struct endevice *)eninfo[ui->ui_unit])->en_addr) & 0xff; | |
103 | es->es_if.if_addr = | |
104 | if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); | |
105 | es->es_if.if_output = enoutput; | |
106 | es->es_if.if_init = eninit; | |
107 | es->es_if.if_ubareset = enreset; | |
11720282 BJ |
108 | } |
109 | ||
f1b2fa5b BJ |
110 | /* |
111 | * Reset of interface after UNIBUS reset. | |
112 | * If interface is on specified uba, reset its state. | |
113 | */ | |
114 | enreset(unit, uban) | |
115 | int unit, uban; | |
8a13b737 | 116 | { |
11720282 | 117 | register struct uba_device *ui; |
f1b2fa5b | 118 | COUNT(ENRESET); |
11720282 BJ |
119 | |
120 | if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0) { | |
8a13b737 | 121 | printf("es%d: not alive\n", unit); |
11720282 BJ |
122 | return; |
123 | } | |
f1b2fa5b BJ |
124 | if (ui->ui_ubanum != uban) |
125 | return; | |
126 | eninit(unit); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Initialization of interface; clear recorded pending | |
131 | * operations, and reinitialize UNIBUS usage. | |
132 | */ | |
133 | eninit(unit) | |
134 | int unit; | |
135 | { | |
136 | register struct uba_device *ui; | |
137 | register struct endevice *addr; | |
138 | register struct en_softc *es; | |
139 | int s; | |
140 | ||
8a13b737 | 141 | es = &en_softc[unit]; |
f1b2fa5b BJ |
142 | ui = eninfo[unit]; |
143 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, | |
144 | sizeof (struct en_header), (int)btop(ENMTU)) == 0) { | |
8a13b737 BJ |
145 | printf("es%d: can't initialize\n", unit); |
146 | return; | |
11720282 | 147 | } |
11720282 | 148 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 | 149 | addr->en_istat = addr->en_ostat = 0; |
11720282 | 150 | |
f1b2fa5b BJ |
151 | /* |
152 | * Hang pending read, start any writes. | |
153 | */ | |
154 | s = splimp(); | |
155 | enstart(unit); | |
156 | enxint(unit); | |
157 | splx(s); | |
11720282 BJ |
158 | } |
159 | ||
3552a746 | 160 | int enlastdel = 25; |
8a13b737 | 161 | |
f1b2fa5b BJ |
162 | /* |
163 | * Start or restart output on interface. | |
164 | * If interface is already active, then this is a retransmit | |
165 | * after a collision, and just restuff registers and delay. | |
166 | * If interface is not already active, get another datagram | |
167 | * to send off of the interface queue, and map it to the interface | |
168 | * before starting the output. | |
169 | */ | |
ae348eea | 170 | enstart(dev) |
11720282 BJ |
171 | dev_t dev; |
172 | { | |
11720282 | 173 | int unit; |
11720282 | 174 | struct uba_device *ui; |
8a13b737 BJ |
175 | register struct endevice *addr; |
176 | register struct en_softc *es; | |
8a13b737 BJ |
177 | struct mbuf *m; |
178 | int dest; | |
ae348eea | 179 | COUNT(ENSTART); |
11720282 BJ |
180 | |
181 | unit = ENUNIT(dev); | |
182 | ui = eninfo[unit]; | |
8a13b737 BJ |
183 | es = &en_softc[unit]; |
184 | if (es->es_oactive) | |
185 | goto restart; | |
f1b2fa5b BJ |
186 | |
187 | /* | |
188 | * Not already active: dequeue another request | |
189 | * and map it to the UNIBUS. If no more requests, | |
190 | * just return. | |
191 | */ | |
192 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
8a13b737 BJ |
193 | if (m == 0) { |
194 | es->es_oactive = 0; | |
11720282 BJ |
195 | return; |
196 | } | |
8a13b737 | 197 | es->es_olen = if_wubaput(&es->es_ifuba, m); |
f1b2fa5b BJ |
198 | |
199 | /* | |
200 | * Ethernet cannot take back-to-back packets (no | |
201 | * buffering in interface. To avoid overrunning | |
202 | * receiver, enforce a small delay (about 1ms) in interface | |
203 | * on successive packets sent to same host. | |
204 | */ | |
205 | dest = mtod(m, struct en_header *)->en_dhost; | |
8a13b737 BJ |
206 | if (es->es_lastx && es->es_lastx == dest) |
207 | es->es_delay = enlastdel; | |
208 | else | |
209 | es->es_lastx = dest; | |
f1b2fa5b | 210 | |
8a13b737 | 211 | restart: |
f1b2fa5b BJ |
212 | /* |
213 | * Have request mapped to UNIBUS for transmission. | |
214 | * Purge any stale data from this BDP, and start the otput. | |
215 | */ | |
216 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); | |
11720282 | 217 | addr = (struct endevice *)ui->ui_addr; |
f1b2fa5b | 218 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_addr; |
8a13b737 BJ |
219 | addr->en_odelay = es->es_delay; |
220 | addr->en_owc = -((es->es_olen + 1) >> 1); | |
941ee7ef | 221 | addr->en_ostat = EN_IEN|EN_GO; |
8a13b737 | 222 | es->es_oactive = 1; |
11720282 BJ |
223 | } |
224 | ||
f1b2fa5b BJ |
225 | /* |
226 | * Ethernet interface transmitter interrupt. | |
227 | * Start another output if more data to send. | |
228 | */ | |
11720282 BJ |
229 | enxint(unit) |
230 | int unit; | |
231 | { | |
232 | register struct endevice *addr; | |
233 | register struct uba_device *ui; | |
8a13b737 | 234 | register struct en_softc *es; |
11720282 BJ |
235 | COUNT(ENXINT); |
236 | ||
237 | ui = eninfo[unit]; | |
8a13b737 BJ |
238 | es = &en_softc[unit]; |
239 | if (es->es_oactive == 0) | |
240 | return; | |
11720282 | 241 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 BJ |
242 | es = &en_softc[unit]; |
243 | es->es_oactive = 0; | |
244 | es->es_delay = 0; | |
245 | es->es_mask = ~0; | |
246 | if (addr->en_ostat&EN_OERROR) | |
247 | printf("es%d: output error\n", unit); | |
f1b2fa5b | 248 | if (es->es_if.if_snd.ifq_head == 0) { |
8a13b737 | 249 | es->es_lastx = 0; |
11720282 BJ |
250 | return; |
251 | } | |
8a13b737 | 252 | enstart(unit); |
11720282 BJ |
253 | } |
254 | ||
f1b2fa5b BJ |
255 | /* |
256 | * Collision on ethernet interface. Do exponential | |
257 | * backoff, and retransmit. If have backed off all | |
258 | * the way printing warning diagnostic, and drop packet. | |
259 | */ | |
11720282 BJ |
260 | encollide(unit) |
261 | int unit; | |
262 | { | |
8a13b737 | 263 | register struct en_softc *es; |
11720282 BJ |
264 | COUNT(ENCOLLIDE); |
265 | ||
8a13b737 | 266 | es = &en_softc[unit]; |
f1b2fa5b | 267 | es->es_if.if_collisions++; |
8a13b737 | 268 | if (es->es_oactive == 0) |
11720282 | 269 | return; |
8a13b737 BJ |
270 | if (es->es_mask == 0) { |
271 | printf("es%d: send error\n", unit); | |
272 | enxint(unit); | |
11720282 | 273 | } else { |
8a13b737 BJ |
274 | es->es_mask <<= 1; |
275 | es->es_delay = mfpr(ICR) &~ es->es_mask; | |
276 | enstart(unit); | |
11720282 | 277 | } |
11720282 BJ |
278 | } |
279 | ||
f1b2fa5b BJ |
280 | /* |
281 | * Ethernet interface receiver interrupt. | |
282 | * If input error just drop packet. | |
283 | * Otherwise purge input buffered data path and examine | |
284 | * packet to determine type. If can't determine length | |
285 | * from type, then have to drop packet. Othewise decapsulate | |
286 | * packet based on type and pass to type specific higher-level | |
287 | * input routine. | |
288 | */ | |
11720282 BJ |
289 | enrint(unit) |
290 | int unit; | |
291 | { | |
8a13b737 BJ |
292 | struct endevice *addr; |
293 | register struct en_softc *es; | |
8a13b737 BJ |
294 | struct en_header *en; |
295 | struct mbuf *m; | |
296 | struct ifqueue *inq; | |
11720282 | 297 | register int len; |
8a13b737 | 298 | int off; |
11720282 BJ |
299 | COUNT(ENRINT); |
300 | ||
f1b2fa5b | 301 | es = &en_softc[unit]; |
8a13b737 | 302 | addr = (struct endevice *)eninfo[unit]->ui_addr; |
f1b2fa5b BJ |
303 | |
304 | /* | |
305 | * Purge BDP; drop error packets. | |
306 | */ | |
307 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); | |
941ee7ef | 308 | if (addr->en_istat&EN_IERROR) { |
f1b2fa5b | 309 | es->es_if.if_ierrors++; |
8a13b737 BJ |
310 | printf("es%d: input error\n", unit); |
311 | goto setup; | |
11720282 | 312 | } |
f1b2fa5b BJ |
313 | |
314 | /* | |
315 | * Get pointer to ethernet header (in input buffer). | |
316 | * Deal with trailer protocol: if type is PUP trailer | |
317 | * get true type from first 16-bit word past data. | |
318 | * Remember that type was trailer by setting off. | |
319 | */ | |
320 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); | |
8a13b737 BJ |
321 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
322 | if (en->en_type >= ENPUP_TRAIL && | |
323 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { | |
324 | off = (en->en_type - ENPUP_TRAIL) * 512; | |
325 | en->en_type = *endataaddr(en, off, u_short *); | |
326 | off += 2; | |
327 | } else | |
328 | off = 0; | |
f1b2fa5b BJ |
329 | |
330 | /* | |
331 | * Attempt to infer packet length from type; | |
332 | * can't deal with packet if can't infer length. | |
333 | */ | |
8a13b737 BJ |
334 | switch (en->en_type) { |
335 | ||
336 | #ifdef INET | |
337 | case ENPUP_IPTYPE: | |
338 | len = endataaddr(en, off, struct ip *)->ip_len; | |
339 | setipintr(); | |
340 | inq = &ipintrq; | |
11720282 BJ |
341 | break; |
342 | #endif | |
11720282 | 343 | |
8a13b737 BJ |
344 | default: |
345 | printf("en%d: unknow pkt type 0x%x\n", en->en_type); | |
346 | goto setup; | |
11720282 | 347 | } |
8a13b737 BJ |
348 | if (len == 0) |
349 | goto setup; | |
f1b2fa5b BJ |
350 | |
351 | /* | |
352 | * Pull packet off interface. Off is nonzero if packet | |
353 | * has trailing header; if_rubaget will then force this header | |
354 | * information to be at the front, but we still have to drop | |
355 | * the two-byte type which is at the front of the trailer data | |
356 | * (which we ``consumed'' above). | |
357 | */ | |
358 | m = if_rubaget(&es->es_ifuba, len, off); | |
359 | if (off) { | |
360 | m->m_off += 2; | |
361 | m->m_len -= 2; | |
362 | } | |
8a13b737 | 363 | IF_ENQUEUE(inq, m); |
f1b2fa5b | 364 | |
ae348eea | 365 | setup: |
f1b2fa5b BJ |
366 | /* |
367 | * Reset for next packet. | |
368 | */ | |
369 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; | |
8a13b737 | 370 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
941ee7ef | 371 | addr->en_istat = EN_IEN|EN_GO; |
ae348eea | 372 | } |
11720282 | 373 | |
8a13b737 BJ |
374 | /* |
375 | * Ethernet output routine. | |
376 | * Encapsulate a packet of type family for the local net. | |
f1b2fa5b BJ |
377 | * Use trailer local net encapsulation if enough data in first |
378 | * packet leaves a multiple of 512 bytes of data in remainder. | |
8a13b737 BJ |
379 | */ |
380 | enoutput(ifp, m0, pf) | |
381 | struct ifnet *ifp; | |
382 | struct mbuf *m0; | |
383 | int pf; | |
11720282 | 384 | { |
8a13b737 | 385 | int type, dest; |
f1b2fa5b | 386 | register struct mbuf *m = m0; |
8a13b737 BJ |
387 | register struct en_header *en; |
388 | int s; | |
389 | ||
390 | switch (pf) { | |
11720282 | 391 | |
8a13b737 BJ |
392 | #ifdef INET |
393 | case PF_INET: { | |
394 | register struct ip *ip = mtod(m0, struct ip *); | |
395 | int off; | |
396 | ||
f1b2fa5b BJ |
397 | dest = ip->ip_dst.s_addr >> 24; |
398 | off = ip->ip_len - m->m_len; | |
399 | if (off && off % 512 == 0 && m->m_off >= MMINOFF + 2) { | |
8a13b737 | 400 | type = ENPUP_TRAIL + (off>>9); |
f1b2fa5b BJ |
401 | m->m_off -= 2; |
402 | m->m_len += 2; | |
403 | *mtod(m, u_short *) = ENPUP_IPTYPE; | |
404 | goto gottrailertype; | |
8a13b737 | 405 | } |
f1b2fa5b BJ |
406 | type = ENPUP_IPTYPE; |
407 | off = 0; | |
408 | goto gottype; | |
8a13b737 | 409 | } |
8a13b737 BJ |
410 | #endif |
411 | ||
412 | default: | |
413 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
414 | m_freem(m0); | |
415 | return (0); | |
416 | } | |
f1b2fa5b BJ |
417 | |
418 | /* | |
419 | * Packet to be sent as trailer: move first packet | |
420 | * (control information) to end of chain. | |
421 | */ | |
422 | gottrailertype: | |
423 | while (m->m_next) | |
424 | m = m->m_next; | |
425 | m->m_next = m0; | |
426 | m = m0->m_next; | |
427 | m0->m_next = 0; | |
428 | ||
429 | /* | |
430 | * Add local net header. If no space in first mbuf, | |
431 | * allocate another. | |
432 | */ | |
433 | gottype: | |
434 | m0 = m; | |
435 | if (MMINOFF + sizeof (struct en_header) > m->m_off) { | |
8a13b737 BJ |
436 | m = m_get(0); |
437 | if (m == 0) { | |
438 | m_freem(m0); | |
439 | return (0); | |
440 | } | |
441 | m->m_next = m0; | |
442 | m->m_off = MMINOFF; | |
443 | m->m_len = sizeof (struct en_header); | |
444 | } else { | |
445 | m = m0; | |
446 | m->m_off -= sizeof (struct en_header); | |
447 | m->m_len += sizeof (struct en_header); | |
11720282 | 448 | } |
8a13b737 BJ |
449 | en = mtod(m, struct en_header *); |
450 | en->en_shost = ifp->if_host[0]; | |
451 | en->en_dhost = dest; | |
452 | en->en_type = type; | |
f1b2fa5b BJ |
453 | |
454 | /* | |
455 | * Queue message on interface, and start output if interface | |
456 | * not yet active. | |
457 | */ | |
8a13b737 BJ |
458 | s = splimp(); |
459 | IF_ENQUEUE(&ifp->if_snd, m); | |
460 | splx(s); | |
461 | if (en_softc[ifp->if_unit].es_oactive == 0) | |
462 | enstart(ifp->if_unit); | |
f1b2fa5b | 463 | return (1); |
11720282 | 464 | } |