Commit | Line | Data |
---|---|---|
7a66118b | 1 | /* if_en.c 4.32 82/02/03 */ |
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; |
f7bbb8eb BJ |
104 | #ifdef ENKLUDGE |
105 | if (es->es_if.if_net == 10) { | |
106 | es->es_if.if_host[0] <<= 16; | |
107 | es->es_if.if_host[0] |= 0x4e; | |
108 | } | |
109 | #endif | |
f1b2fa5b BJ |
110 | es->es_if.if_addr = |
111 | if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); | |
f1b2fa5b | 112 | es->es_if.if_init = eninit; |
b454c3ea | 113 | es->es_if.if_output = enoutput; |
f1b2fa5b | 114 | es->es_if.if_ubareset = enreset; |
7a66118b | 115 | es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16; |
405c9168 | 116 | if_attach(&es->es_if); |
11720282 BJ |
117 | } |
118 | ||
f1b2fa5b BJ |
119 | /* |
120 | * Reset of interface after UNIBUS reset. | |
121 | * If interface is on specified uba, reset its state. | |
122 | */ | |
123 | enreset(unit, uban) | |
124 | int unit, uban; | |
8a13b737 | 125 | { |
11720282 | 126 | register struct uba_device *ui; |
f1b2fa5b | 127 | COUNT(ENRESET); |
11720282 | 128 | |
b454c3ea BJ |
129 | if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || |
130 | ui->ui_ubanum != uban) | |
f1b2fa5b | 131 | return; |
b454c3ea | 132 | printf(" en%d", unit); |
f1b2fa5b BJ |
133 | eninit(unit); |
134 | } | |
135 | ||
136 | /* | |
137 | * Initialization of interface; clear recorded pending | |
138 | * operations, and reinitialize UNIBUS usage. | |
139 | */ | |
140 | eninit(unit) | |
141 | int unit; | |
142 | { | |
b454c3ea BJ |
143 | register struct en_softc *es = &en_softc[unit]; |
144 | register struct uba_device *ui = eninfo[unit]; | |
f1b2fa5b | 145 | register struct endevice *addr; |
f1b2fa5b BJ |
146 | int s; |
147 | ||
f1b2fa5b BJ |
148 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, |
149 | sizeof (struct en_header), (int)btop(ENMTU)) == 0) { | |
b454c3ea | 150 | printf("en%d: can't initialize\n", unit); |
8a13b737 | 151 | return; |
11720282 | 152 | } |
11720282 | 153 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 | 154 | addr->en_istat = addr->en_ostat = 0; |
11720282 | 155 | |
f1b2fa5b | 156 | /* |
b454c3ea BJ |
157 | * Hang a receive and start any |
158 | * pending writes by faking a transmit complete. | |
f1b2fa5b BJ |
159 | */ |
160 | s = splimp(); | |
b454c3ea BJ |
161 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
162 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; | |
163 | addr->en_istat = EN_IEN|EN_GO; | |
164 | es->es_oactive = 1; | |
f1b2fa5b BJ |
165 | enxint(unit); |
166 | splx(s); | |
11720282 BJ |
167 | } |
168 | ||
3552a746 | 169 | int enlastdel = 25; |
8a13b737 | 170 | |
f1b2fa5b BJ |
171 | /* |
172 | * Start or restart output on interface. | |
173 | * If interface is already active, then this is a retransmit | |
174 | * after a collision, and just restuff registers and delay. | |
175 | * If interface is not already active, get another datagram | |
176 | * to send off of the interface queue, and map it to the interface | |
177 | * before starting the output. | |
178 | */ | |
ae348eea | 179 | enstart(dev) |
11720282 BJ |
180 | dev_t dev; |
181 | { | |
b454c3ea BJ |
182 | int unit = ENUNIT(dev); |
183 | struct uba_device *ui = eninfo[unit]; | |
184 | register struct en_softc *es = &en_softc[unit]; | |
8a13b737 | 185 | register struct endevice *addr; |
8a13b737 BJ |
186 | struct mbuf *m; |
187 | int dest; | |
ae348eea | 188 | COUNT(ENSTART); |
11720282 | 189 | |
8a13b737 BJ |
190 | if (es->es_oactive) |
191 | goto restart; | |
f1b2fa5b BJ |
192 | |
193 | /* | |
194 | * Not already active: dequeue another request | |
195 | * and map it to the UNIBUS. If no more requests, | |
196 | * just return. | |
197 | */ | |
198 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
8a13b737 BJ |
199 | if (m == 0) { |
200 | es->es_oactive = 0; | |
11720282 BJ |
201 | return; |
202 | } | |
a453e1b5 | 203 | dest = mtod(m, struct en_header *)->en_dhost; |
8a13b737 | 204 | es->es_olen = if_wubaput(&es->es_ifuba, m); |
f1b2fa5b BJ |
205 | |
206 | /* | |
207 | * Ethernet cannot take back-to-back packets (no | |
208 | * buffering in interface. To avoid overrunning | |
209 | * receiver, enforce a small delay (about 1ms) in interface | |
210 | * on successive packets sent to same host. | |
211 | */ | |
8a13b737 BJ |
212 | if (es->es_lastx && es->es_lastx == dest) |
213 | es->es_delay = enlastdel; | |
214 | else | |
215 | es->es_lastx = dest; | |
f1b2fa5b | 216 | |
8a13b737 | 217 | restart: |
f1b2fa5b BJ |
218 | /* |
219 | * Have request mapped to UNIBUS for transmission. | |
220 | * Purge any stale data from this BDP, and start the otput. | |
221 | */ | |
222 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); | |
11720282 | 223 | addr = (struct endevice *)ui->ui_addr; |
405c9168 | 224 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; |
8a13b737 BJ |
225 | addr->en_odelay = es->es_delay; |
226 | addr->en_owc = -((es->es_olen + 1) >> 1); | |
941ee7ef | 227 | addr->en_ostat = EN_IEN|EN_GO; |
8a13b737 | 228 | es->es_oactive = 1; |
11720282 BJ |
229 | } |
230 | ||
f1b2fa5b BJ |
231 | /* |
232 | * Ethernet interface transmitter interrupt. | |
233 | * Start another output if more data to send. | |
234 | */ | |
11720282 BJ |
235 | enxint(unit) |
236 | int unit; | |
237 | { | |
b454c3ea BJ |
238 | register struct uba_device *ui = eninfo[unit]; |
239 | register struct en_softc *es = &en_softc[unit]; | |
11720282 | 240 | register struct endevice *addr; |
11720282 BJ |
241 | COUNT(ENXINT); |
242 | ||
8a13b737 BJ |
243 | if (es->es_oactive == 0) |
244 | return; | |
11720282 | 245 | addr = (struct endevice *)ui->ui_addr; |
b454c3ea | 246 | es->es_if.if_opackets++; |
8a13b737 BJ |
247 | es->es_oactive = 0; |
248 | es->es_delay = 0; | |
249 | es->es_mask = ~0; | |
89413846 BJ |
250 | if (addr->en_ostat&EN_OERROR) { |
251 | es->es_if.if_oerrors++; | |
a453e1b5 | 252 | printf("en%d: output error\n", unit); |
89413846 | 253 | } |
7a66118b BJ |
254 | if (es->es_ifuba.ifu_xtofree) { |
255 | m_freem(es->es_ifuba.ifu_xtofree); | |
256 | es->es_ifuba.ifu_xtofree = 0; | |
257 | } | |
f1b2fa5b | 258 | if (es->es_if.if_snd.ifq_head == 0) { |
8a13b737 | 259 | es->es_lastx = 0; |
11720282 BJ |
260 | return; |
261 | } | |
8a13b737 | 262 | enstart(unit); |
11720282 BJ |
263 | } |
264 | ||
f1b2fa5b BJ |
265 | /* |
266 | * Collision on ethernet interface. Do exponential | |
267 | * backoff, and retransmit. If have backed off all | |
268 | * the way printing warning diagnostic, and drop packet. | |
269 | */ | |
11720282 BJ |
270 | encollide(unit) |
271 | int unit; | |
272 | { | |
b454c3ea | 273 | register struct en_softc *es = &en_softc[unit]; |
11720282 BJ |
274 | COUNT(ENCOLLIDE); |
275 | ||
f1b2fa5b | 276 | es->es_if.if_collisions++; |
8a13b737 | 277 | if (es->es_oactive == 0) |
11720282 | 278 | return; |
b454c3ea BJ |
279 | /* |
280 | * Es_mask is a 16 bit number with n low zero bits, with | |
281 | * n the number of backoffs. When es_mask is 0 we have | |
282 | * backed off 16 times, and give up. | |
283 | */ | |
8a13b737 | 284 | if (es->es_mask == 0) { |
a453e1b5 | 285 | printf("en%d: send error\n", unit); |
8a13b737 | 286 | enxint(unit); |
b454c3ea | 287 | return; |
11720282 | 288 | } |
b454c3ea BJ |
289 | /* |
290 | * Another backoff. Restart with delay based on n low bits | |
291 | * of the interval timer. | |
292 | */ | |
293 | es->es_mask <<= 1; | |
294 | es->es_delay = mfpr(ICR) &~ es->es_mask; | |
295 | enstart(unit); | |
11720282 BJ |
296 | } |
297 | ||
541c2984 | 298 | int enprintierrors; |
f1b2fa5b BJ |
299 | /* |
300 | * Ethernet interface receiver interrupt. | |
301 | * If input error just drop packet. | |
302 | * Otherwise purge input buffered data path and examine | |
303 | * packet to determine type. If can't determine length | |
304 | * from type, then have to drop packet. Othewise decapsulate | |
305 | * packet based on type and pass to type specific higher-level | |
306 | * input routine. | |
307 | */ | |
11720282 BJ |
308 | enrint(unit) |
309 | int unit; | |
310 | { | |
b454c3ea BJ |
311 | register struct en_softc *es = &en_softc[unit]; |
312 | struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; | |
313 | register struct en_header *en; | |
8a13b737 | 314 | struct mbuf *m; |
b454c3ea BJ |
315 | int len; |
316 | register struct ifqueue *inq; | |
8a13b737 | 317 | int off; |
11720282 BJ |
318 | COUNT(ENRINT); |
319 | ||
b454c3ea | 320 | es->es_if.if_ipackets++; |
f1b2fa5b BJ |
321 | |
322 | /* | |
b454c3ea | 323 | * Purge BDP; drop if input error indicated. |
f1b2fa5b BJ |
324 | */ |
325 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); | |
941ee7ef | 326 | if (addr->en_istat&EN_IERROR) { |
f1b2fa5b | 327 | es->es_if.if_ierrors++; |
541c2984 | 328 | if (enprintierrors) |
a453e1b5 | 329 | printf("en%d: input error\n", unit); |
8a13b737 | 330 | goto setup; |
11720282 | 331 | } |
f1b2fa5b BJ |
332 | |
333 | /* | |
334 | * Get pointer to ethernet header (in input buffer). | |
335 | * Deal with trailer protocol: if type is PUP trailer | |
336 | * get true type from first 16-bit word past data. | |
337 | * Remember that type was trailer by setting off. | |
338 | */ | |
339 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); | |
8a13b737 BJ |
340 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
341 | if (en->en_type >= ENPUP_TRAIL && | |
342 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { | |
343 | off = (en->en_type - ENPUP_TRAIL) * 512; | |
b454c3ea BJ |
344 | if (off >= ENMTU) |
345 | goto setup; /* sanity */ | |
8a13b737 | 346 | en->en_type = *endataaddr(en, off, u_short *); |
8a13b737 BJ |
347 | } else |
348 | off = 0; | |
f1b2fa5b BJ |
349 | |
350 | /* | |
351 | * Attempt to infer packet length from type; | |
352 | * can't deal with packet if can't infer length. | |
353 | */ | |
8a13b737 BJ |
354 | switch (en->en_type) { |
355 | ||
356 | #ifdef INET | |
357 | case ENPUP_IPTYPE: | |
6255745d BJ |
358 | len = htons((u_short)endataaddr(en, off ? off+2 : 0, struct ip *)->ip_len); |
359 | if (off) | |
360 | len += 2; | |
8a13b737 BJ |
361 | setipintr(); |
362 | inq = &ipintrq; | |
11720282 BJ |
363 | break; |
364 | #endif | |
11720282 | 365 | |
8a13b737 BJ |
366 | default: |
367 | printf("en%d: unknow pkt type 0x%x\n", en->en_type); | |
368 | goto setup; | |
11720282 | 369 | } |
8a13b737 BJ |
370 | if (len == 0) |
371 | goto setup; | |
f1b2fa5b BJ |
372 | |
373 | /* | |
374 | * Pull packet off interface. Off is nonzero if packet | |
375 | * has trailing header; if_rubaget will then force this header | |
376 | * information to be at the front, but we still have to drop | |
b454c3ea | 377 | * the two-byte type which is at the front of any trailer data. |
f1b2fa5b BJ |
378 | */ |
379 | m = if_rubaget(&es->es_ifuba, len, off); | |
a453e1b5 BJ |
380 | if (m == 0) |
381 | goto setup; | |
f1b2fa5b BJ |
382 | if (off) { |
383 | m->m_off += 2; | |
384 | m->m_len -= 2; | |
385 | } | |
8a13b737 | 386 | IF_ENQUEUE(inq, m); |
f1b2fa5b | 387 | |
ae348eea | 388 | setup: |
f1b2fa5b BJ |
389 | /* |
390 | * Reset for next packet. | |
391 | */ | |
392 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; | |
8a13b737 | 393 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
941ee7ef | 394 | addr->en_istat = EN_IEN|EN_GO; |
ae348eea | 395 | } |
11720282 | 396 | |
8a13b737 BJ |
397 | /* |
398 | * Ethernet output routine. | |
399 | * Encapsulate a packet of type family for the local net. | |
f1b2fa5b BJ |
400 | * Use trailer local net encapsulation if enough data in first |
401 | * packet leaves a multiple of 512 bytes of data in remainder. | |
8a13b737 BJ |
402 | */ |
403 | enoutput(ifp, m0, pf) | |
404 | struct ifnet *ifp; | |
405 | struct mbuf *m0; | |
406 | int pf; | |
11720282 | 407 | { |
8a13b737 | 408 | int type, dest; |
f1b2fa5b | 409 | register struct mbuf *m = m0; |
8a13b737 BJ |
410 | register struct en_header *en; |
411 | int s; | |
412 | ||
413 | switch (pf) { | |
11720282 | 414 | |
8a13b737 BJ |
415 | #ifdef INET |
416 | case PF_INET: { | |
417 | register struct ip *ip = mtod(m0, struct ip *); | |
418 | int off; | |
419 | ||
f7bbb8eb | 420 | #ifndef ENKLUDGE |
f1b2fa5b | 421 | dest = ip->ip_dst.s_addr >> 24; |
f7bbb8eb BJ |
422 | #else |
423 | dest = (ip->ip_dst.s_addr >> 8) & 0xff; | |
424 | #endif | |
6255745d | 425 | off = ntohs((u_short)ip->ip_len) - m->m_len; |
86532ef6 | 426 | #ifndef ENKLUDGE |
b454c3ea | 427 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
8a13b737 | 428 | type = ENPUP_TRAIL + (off>>9); |
f1b2fa5b BJ |
429 | m->m_off -= 2; |
430 | m->m_len += 2; | |
431 | *mtod(m, u_short *) = ENPUP_IPTYPE; | |
432 | goto gottrailertype; | |
8a13b737 | 433 | } |
86532ef6 | 434 | #endif |
f1b2fa5b BJ |
435 | type = ENPUP_IPTYPE; |
436 | off = 0; | |
437 | goto gottype; | |
8a13b737 | 438 | } |
8a13b737 BJ |
439 | #endif |
440 | ||
441 | default: | |
442 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
443 | m_freem(m0); | |
444 | return (0); | |
445 | } | |
f1b2fa5b | 446 | |
b454c3ea | 447 | gottrailertype: |
f1b2fa5b BJ |
448 | /* |
449 | * Packet to be sent as trailer: move first packet | |
450 | * (control information) to end of chain. | |
451 | */ | |
f1b2fa5b BJ |
452 | while (m->m_next) |
453 | m = m->m_next; | |
454 | m->m_next = m0; | |
455 | m = m0->m_next; | |
456 | m0->m_next = 0; | |
b454c3ea | 457 | m0 = m; |
f1b2fa5b | 458 | |
b454c3ea | 459 | gottype: |
f1b2fa5b BJ |
460 | /* |
461 | * Add local net header. If no space in first mbuf, | |
462 | * allocate another. | |
463 | */ | |
a453e1b5 BJ |
464 | if (m->m_off > MMAXOFF || |
465 | MMINOFF + sizeof (struct en_header) > m->m_off) { | |
ef9b4258 | 466 | m = m_get(M_DONTWAIT); |
8a13b737 BJ |
467 | if (m == 0) { |
468 | m_freem(m0); | |
469 | return (0); | |
470 | } | |
471 | m->m_next = m0; | |
472 | m->m_off = MMINOFF; | |
473 | m->m_len = sizeof (struct en_header); | |
474 | } else { | |
8a13b737 BJ |
475 | m->m_off -= sizeof (struct en_header); |
476 | m->m_len += sizeof (struct en_header); | |
11720282 | 477 | } |
8a13b737 BJ |
478 | en = mtod(m, struct en_header *); |
479 | en->en_shost = ifp->if_host[0]; | |
480 | en->en_dhost = dest; | |
481 | en->en_type = type; | |
f1b2fa5b BJ |
482 | |
483 | /* | |
484 | * Queue message on interface, and start output if interface | |
485 | * not yet active. | |
486 | */ | |
8a13b737 BJ |
487 | s = splimp(); |
488 | IF_ENQUEUE(&ifp->if_snd, m); | |
8a13b737 BJ |
489 | if (en_softc[ifp->if_unit].es_oactive == 0) |
490 | enstart(ifp->if_unit); | |
89413846 | 491 | splx(s); |
f1b2fa5b | 492 | return (1); |
11720282 | 493 | } |