Commit | Line | Data |
---|---|---|
6255745d | 1 | /* if_en.c 4.20 81/12/11 */ |
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 | ||
a453e1b5 | 30 | #define ENMTU (1024+512) |
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 = | |
b454c3ea | 36 | { enprobe, 0, enattach, 0, enstd, "en", 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 | { | |
b454c3ea | 70 | register int br, cvec; /* r11, r10 value-result */ |
11720282 BJ |
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; | |
b454c3ea | 99 | es->es_if.if_name = "en"; |
f1b2fa5b BJ |
100 | es->es_if.if_mtu = ENMTU; |
101 | es->es_if.if_net = ui->ui_flags; | |
102 | es->es_if.if_host[0] = | |
a453e1b5 | 103 | (~(((struct endevice *)eninfo[ui->ui_unit]->ui_addr)->en_addr)) & 0xff; |
f1b2fa5b BJ |
104 | es->es_if.if_addr = |
105 | if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); | |
f1b2fa5b | 106 | es->es_if.if_init = eninit; |
b454c3ea | 107 | es->es_if.if_output = enoutput; |
f1b2fa5b | 108 | es->es_if.if_ubareset = enreset; |
405c9168 | 109 | if_attach(&es->es_if); |
11720282 BJ |
110 | } |
111 | ||
f1b2fa5b BJ |
112 | /* |
113 | * Reset of interface after UNIBUS reset. | |
114 | * If interface is on specified uba, reset its state. | |
115 | */ | |
116 | enreset(unit, uban) | |
117 | int unit, uban; | |
8a13b737 | 118 | { |
11720282 | 119 | register struct uba_device *ui; |
f1b2fa5b | 120 | COUNT(ENRESET); |
11720282 | 121 | |
b454c3ea BJ |
122 | if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || |
123 | ui->ui_ubanum != uban) | |
f1b2fa5b | 124 | return; |
b454c3ea | 125 | printf(" en%d", unit); |
f1b2fa5b BJ |
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 | { | |
b454c3ea BJ |
136 | register struct en_softc *es = &en_softc[unit]; |
137 | register struct uba_device *ui = eninfo[unit]; | |
f1b2fa5b | 138 | register struct endevice *addr; |
f1b2fa5b BJ |
139 | int s; |
140 | ||
f1b2fa5b BJ |
141 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, |
142 | sizeof (struct en_header), (int)btop(ENMTU)) == 0) { | |
b454c3ea | 143 | printf("en%d: can't initialize\n", unit); |
8a13b737 | 144 | return; |
11720282 | 145 | } |
11720282 | 146 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 | 147 | addr->en_istat = addr->en_ostat = 0; |
11720282 | 148 | |
f1b2fa5b | 149 | /* |
b454c3ea BJ |
150 | * Hang a receive and start any |
151 | * pending writes by faking a transmit complete. | |
f1b2fa5b BJ |
152 | */ |
153 | s = splimp(); | |
b454c3ea BJ |
154 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
155 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; | |
156 | addr->en_istat = EN_IEN|EN_GO; | |
157 | es->es_oactive = 1; | |
f1b2fa5b BJ |
158 | enxint(unit); |
159 | splx(s); | |
11720282 BJ |
160 | } |
161 | ||
3552a746 | 162 | int enlastdel = 25; |
8a13b737 | 163 | |
f1b2fa5b BJ |
164 | /* |
165 | * Start or restart output on interface. | |
166 | * If interface is already active, then this is a retransmit | |
167 | * after a collision, and just restuff registers and delay. | |
168 | * If interface is not already active, get another datagram | |
169 | * to send off of the interface queue, and map it to the interface | |
170 | * before starting the output. | |
171 | */ | |
ae348eea | 172 | enstart(dev) |
11720282 BJ |
173 | dev_t dev; |
174 | { | |
b454c3ea BJ |
175 | int unit = ENUNIT(dev); |
176 | struct uba_device *ui = eninfo[unit]; | |
177 | register struct en_softc *es = &en_softc[unit]; | |
8a13b737 | 178 | register struct endevice *addr; |
8a13b737 BJ |
179 | struct mbuf *m; |
180 | int dest; | |
ae348eea | 181 | COUNT(ENSTART); |
11720282 | 182 | |
8a13b737 BJ |
183 | if (es->es_oactive) |
184 | goto restart; | |
f1b2fa5b BJ |
185 | |
186 | /* | |
187 | * Not already active: dequeue another request | |
188 | * and map it to the UNIBUS. If no more requests, | |
189 | * just return. | |
190 | */ | |
191 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
8a13b737 BJ |
192 | if (m == 0) { |
193 | es->es_oactive = 0; | |
11720282 BJ |
194 | return; |
195 | } | |
a453e1b5 | 196 | dest = mtod(m, struct en_header *)->en_dhost; |
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 | */ | |
8a13b737 BJ |
205 | if (es->es_lastx && es->es_lastx == dest) |
206 | es->es_delay = enlastdel; | |
207 | else | |
208 | es->es_lastx = dest; | |
f1b2fa5b | 209 | |
8a13b737 | 210 | restart: |
f1b2fa5b BJ |
211 | /* |
212 | * Have request mapped to UNIBUS for transmission. | |
213 | * Purge any stale data from this BDP, and start the otput. | |
214 | */ | |
215 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); | |
11720282 | 216 | addr = (struct endevice *)ui->ui_addr; |
405c9168 | 217 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; |
8a13b737 BJ |
218 | addr->en_odelay = es->es_delay; |
219 | addr->en_owc = -((es->es_olen + 1) >> 1); | |
941ee7ef | 220 | addr->en_ostat = EN_IEN|EN_GO; |
8a13b737 | 221 | es->es_oactive = 1; |
11720282 BJ |
222 | } |
223 | ||
f1b2fa5b BJ |
224 | /* |
225 | * Ethernet interface transmitter interrupt. | |
226 | * Start another output if more data to send. | |
227 | */ | |
11720282 BJ |
228 | enxint(unit) |
229 | int unit; | |
230 | { | |
b454c3ea BJ |
231 | register struct uba_device *ui = eninfo[unit]; |
232 | register struct en_softc *es = &en_softc[unit]; | |
11720282 | 233 | register struct endevice *addr; |
11720282 BJ |
234 | COUNT(ENXINT); |
235 | ||
8a13b737 BJ |
236 | if (es->es_oactive == 0) |
237 | return; | |
11720282 | 238 | addr = (struct endevice *)ui->ui_addr; |
b454c3ea | 239 | es->es_if.if_opackets++; |
8a13b737 BJ |
240 | es->es_oactive = 0; |
241 | es->es_delay = 0; | |
242 | es->es_mask = ~0; | |
243 | if (addr->en_ostat&EN_OERROR) | |
a453e1b5 | 244 | printf("en%d: output error\n", unit); |
f1b2fa5b | 245 | if (es->es_if.if_snd.ifq_head == 0) { |
b454c3ea BJ |
246 | es->es_if.if_oerrors++; |
247 | if (es->es_ifuba.ifu_xtofree) { | |
248 | m_freem(es->es_ifuba.ifu_xtofree); | |
249 | es->es_ifuba.ifu_xtofree = 0; | |
250 | } | |
8a13b737 | 251 | es->es_lastx = 0; |
11720282 BJ |
252 | return; |
253 | } | |
8a13b737 | 254 | enstart(unit); |
11720282 BJ |
255 | } |
256 | ||
f1b2fa5b BJ |
257 | /* |
258 | * Collision on ethernet interface. Do exponential | |
259 | * backoff, and retransmit. If have backed off all | |
260 | * the way printing warning diagnostic, and drop packet. | |
261 | */ | |
11720282 BJ |
262 | encollide(unit) |
263 | int unit; | |
264 | { | |
b454c3ea | 265 | register struct en_softc *es = &en_softc[unit]; |
11720282 BJ |
266 | COUNT(ENCOLLIDE); |
267 | ||
f1b2fa5b | 268 | es->es_if.if_collisions++; |
8a13b737 | 269 | if (es->es_oactive == 0) |
11720282 | 270 | return; |
b454c3ea BJ |
271 | /* |
272 | * Es_mask is a 16 bit number with n low zero bits, with | |
273 | * n the number of backoffs. When es_mask is 0 we have | |
274 | * backed off 16 times, and give up. | |
275 | */ | |
8a13b737 | 276 | if (es->es_mask == 0) { |
a453e1b5 | 277 | printf("en%d: send error\n", unit); |
8a13b737 | 278 | enxint(unit); |
b454c3ea | 279 | return; |
11720282 | 280 | } |
b454c3ea BJ |
281 | /* |
282 | * Another backoff. Restart with delay based on n low bits | |
283 | * of the interval timer. | |
284 | */ | |
285 | es->es_mask <<= 1; | |
286 | es->es_delay = mfpr(ICR) &~ es->es_mask; | |
287 | enstart(unit); | |
11720282 BJ |
288 | } |
289 | ||
f1b2fa5b BJ |
290 | /* |
291 | * Ethernet interface receiver interrupt. | |
292 | * If input error just drop packet. | |
293 | * Otherwise purge input buffered data path and examine | |
294 | * packet to determine type. If can't determine length | |
295 | * from type, then have to drop packet. Othewise decapsulate | |
296 | * packet based on type and pass to type specific higher-level | |
297 | * input routine. | |
298 | */ | |
11720282 BJ |
299 | enrint(unit) |
300 | int unit; | |
301 | { | |
b454c3ea BJ |
302 | register struct en_softc *es = &en_softc[unit]; |
303 | struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; | |
304 | register struct en_header *en; | |
8a13b737 | 305 | struct mbuf *m; |
b454c3ea BJ |
306 | int len; |
307 | register struct ifqueue *inq; | |
8a13b737 | 308 | int off; |
11720282 BJ |
309 | COUNT(ENRINT); |
310 | ||
b454c3ea | 311 | es->es_if.if_ipackets++; |
f1b2fa5b BJ |
312 | |
313 | /* | |
b454c3ea | 314 | * Purge BDP; drop if input error indicated. |
f1b2fa5b BJ |
315 | */ |
316 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); | |
941ee7ef | 317 | if (addr->en_istat&EN_IERROR) { |
f1b2fa5b | 318 | es->es_if.if_ierrors++; |
a453e1b5 | 319 | printf("en%d: input error\n", unit); |
8a13b737 | 320 | goto setup; |
11720282 | 321 | } |
f1b2fa5b BJ |
322 | |
323 | /* | |
324 | * Get pointer to ethernet header (in input buffer). | |
325 | * Deal with trailer protocol: if type is PUP trailer | |
326 | * get true type from first 16-bit word past data. | |
327 | * Remember that type was trailer by setting off. | |
328 | */ | |
329 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); | |
8a13b737 BJ |
330 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
331 | if (en->en_type >= ENPUP_TRAIL && | |
332 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { | |
333 | off = (en->en_type - ENPUP_TRAIL) * 512; | |
b454c3ea BJ |
334 | if (off >= ENMTU) |
335 | goto setup; /* sanity */ | |
8a13b737 | 336 | en->en_type = *endataaddr(en, off, u_short *); |
8a13b737 BJ |
337 | } else |
338 | off = 0; | |
f1b2fa5b BJ |
339 | |
340 | /* | |
341 | * Attempt to infer packet length from type; | |
342 | * can't deal with packet if can't infer length. | |
343 | */ | |
8a13b737 BJ |
344 | switch (en->en_type) { |
345 | ||
346 | #ifdef INET | |
347 | case ENPUP_IPTYPE: | |
6255745d BJ |
348 | len = htons((u_short)endataaddr(en, off ? off+2 : 0, struct ip *)->ip_len); |
349 | if (off) | |
350 | len += 2; | |
351 | printf("enet rcvd len %d\n", len); | |
8a13b737 BJ |
352 | setipintr(); |
353 | inq = &ipintrq; | |
11720282 BJ |
354 | break; |
355 | #endif | |
11720282 | 356 | |
8a13b737 BJ |
357 | default: |
358 | printf("en%d: unknow pkt type 0x%x\n", en->en_type); | |
359 | goto setup; | |
11720282 | 360 | } |
8a13b737 BJ |
361 | if (len == 0) |
362 | goto setup; | |
f1b2fa5b BJ |
363 | |
364 | /* | |
365 | * Pull packet off interface. Off is nonzero if packet | |
366 | * has trailing header; if_rubaget will then force this header | |
367 | * information to be at the front, but we still have to drop | |
b454c3ea | 368 | * the two-byte type which is at the front of any trailer data. |
f1b2fa5b BJ |
369 | */ |
370 | m = if_rubaget(&es->es_ifuba, len, off); | |
a453e1b5 BJ |
371 | if (m == 0) |
372 | goto setup; | |
373 | printf("rubaget returns m %x\n", m); | |
374 | asm("halt"); | |
f1b2fa5b BJ |
375 | if (off) { |
376 | m->m_off += 2; | |
377 | m->m_len -= 2; | |
378 | } | |
8a13b737 | 379 | IF_ENQUEUE(inq, m); |
f1b2fa5b | 380 | |
ae348eea | 381 | setup: |
f1b2fa5b BJ |
382 | /* |
383 | * Reset for next packet. | |
384 | */ | |
385 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; | |
8a13b737 | 386 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
941ee7ef | 387 | addr->en_istat = EN_IEN|EN_GO; |
ae348eea | 388 | } |
11720282 | 389 | |
8a13b737 BJ |
390 | /* |
391 | * Ethernet output routine. | |
392 | * Encapsulate a packet of type family for the local net. | |
f1b2fa5b BJ |
393 | * Use trailer local net encapsulation if enough data in first |
394 | * packet leaves a multiple of 512 bytes of data in remainder. | |
8a13b737 BJ |
395 | */ |
396 | enoutput(ifp, m0, pf) | |
397 | struct ifnet *ifp; | |
398 | struct mbuf *m0; | |
399 | int pf; | |
11720282 | 400 | { |
8a13b737 | 401 | int type, dest; |
f1b2fa5b | 402 | register struct mbuf *m = m0; |
8a13b737 BJ |
403 | register struct en_header *en; |
404 | int s; | |
405 | ||
406 | switch (pf) { | |
11720282 | 407 | |
8a13b737 BJ |
408 | #ifdef INET |
409 | case PF_INET: { | |
410 | register struct ip *ip = mtod(m0, struct ip *); | |
411 | int off; | |
412 | ||
f1b2fa5b | 413 | dest = ip->ip_dst.s_addr >> 24; |
6255745d | 414 | off = ntohs((u_short)ip->ip_len) - m->m_len; |
b454c3ea | 415 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
8a13b737 | 416 | type = ENPUP_TRAIL + (off>>9); |
f1b2fa5b BJ |
417 | m->m_off -= 2; |
418 | m->m_len += 2; | |
419 | *mtod(m, u_short *) = ENPUP_IPTYPE; | |
420 | goto gottrailertype; | |
8a13b737 | 421 | } |
f1b2fa5b BJ |
422 | type = ENPUP_IPTYPE; |
423 | off = 0; | |
424 | goto gottype; | |
8a13b737 | 425 | } |
8a13b737 BJ |
426 | #endif |
427 | ||
428 | default: | |
429 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
430 | m_freem(m0); | |
431 | return (0); | |
432 | } | |
f1b2fa5b | 433 | |
b454c3ea | 434 | gottrailertype: |
f1b2fa5b BJ |
435 | /* |
436 | * Packet to be sent as trailer: move first packet | |
437 | * (control information) to end of chain. | |
438 | */ | |
f1b2fa5b BJ |
439 | while (m->m_next) |
440 | m = m->m_next; | |
441 | m->m_next = m0; | |
442 | m = m0->m_next; | |
443 | m0->m_next = 0; | |
b454c3ea | 444 | m0 = m; |
f1b2fa5b | 445 | |
b454c3ea | 446 | gottype: |
f1b2fa5b BJ |
447 | /* |
448 | * Add local net header. If no space in first mbuf, | |
449 | * allocate another. | |
450 | */ | |
a453e1b5 BJ |
451 | if (m->m_off > MMAXOFF || |
452 | MMINOFF + sizeof (struct en_header) > m->m_off) { | |
8a13b737 BJ |
453 | m = m_get(0); |
454 | if (m == 0) { | |
455 | m_freem(m0); | |
456 | return (0); | |
457 | } | |
458 | m->m_next = m0; | |
459 | m->m_off = MMINOFF; | |
460 | m->m_len = sizeof (struct en_header); | |
461 | } else { | |
8a13b737 BJ |
462 | m->m_off -= sizeof (struct en_header); |
463 | m->m_len += sizeof (struct en_header); | |
11720282 | 464 | } |
8a13b737 BJ |
465 | en = mtod(m, struct en_header *); |
466 | en->en_shost = ifp->if_host[0]; | |
467 | en->en_dhost = dest; | |
468 | en->en_type = type; | |
f1b2fa5b BJ |
469 | |
470 | /* | |
471 | * Queue message on interface, and start output if interface | |
472 | * not yet active. | |
473 | */ | |
8a13b737 BJ |
474 | s = splimp(); |
475 | IF_ENQUEUE(&ifp->if_snd, m); | |
476 | splx(s); | |
477 | if (en_softc[ifp->if_unit].es_oactive == 0) | |
478 | enstart(ifp->if_unit); | |
f1b2fa5b | 479 | return (1); |
11720282 | 480 | } |