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15e4fdff C |
1 | /* if_ec.c 4.32 82/12/17 */ |
2 | ||
3 | #include "ec.h" | |
4 | ||
5 | /* | |
6 | * 3Com Ethernet Controller interface | |
7 | */ | |
8 | #include "../machine/pte.h" | |
9 | ||
10 | #include "../h/param.h" | |
11 | #include "../h/systm.h" | |
12 | #include "../h/mbuf.h" | |
13 | #include "../h/buf.h" | |
14 | #include "../h/protosw.h" | |
15 | #include "../h/socket.h" | |
16 | #include "../h/vmmac.h" | |
17 | #include <errno.h> | |
18 | ||
19 | #include "../net/if.h" | |
20 | #include "../net/netisr.h" | |
21 | #include "../net/route.h" | |
22 | #include "../netinet/in.h" | |
23 | #include "../netinet/in_systm.h" | |
24 | #include "../netinet/ip.h" | |
25 | #include "../netinet/ip_var.h" | |
26 | #include "../netpup/pup.h" | |
27 | ||
28 | #include "../vax/cpu.h" | |
29 | #include "../vax/mtpr.h" | |
30 | #include "../vaxif/if_ether.h" | |
31 | #include "../vaxif/if_ecreg.h" | |
32 | #include "../vaxif/if_uba.h" | |
33 | #include "../vaxuba/ubareg.h" | |
34 | #include "../vaxuba/ubavar.h" | |
35 | ||
36 | #define ECMEM 0000000 | |
37 | ||
38 | int ecprobe(), ecattach(), ecrint(), ecxint(), eccollide(); | |
39 | struct uba_device *ecinfo[NEC]; | |
40 | u_short ecstd[] = { 0 }; | |
41 | struct uba_driver ecdriver = | |
42 | { ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo }; | |
43 | u_char ec_iltop[3] = { 0x02, 0x07, 0x01 }; | |
44 | u_char ecbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
45 | #define ECUNIT(x) minor(x) | |
46 | ||
47 | int ecinit(),ecoutput(),ecreset(); | |
48 | struct mbuf *ecget(); | |
49 | ||
50 | extern struct ifnet loif; | |
51 | ||
52 | /* | |
53 | * Ethernet software status per interface. | |
54 | * | |
55 | * Each interface is referenced by a network interface structure, | |
56 | * es_if, which the routing code uses to locate the interface. | |
57 | * This structure contains the output queue for the interface, its address, ... | |
58 | * We also have, for each interface, a UBA interface structure, which | |
59 | * contains information about the UNIBUS resources held by the interface: | |
60 | * map registers, buffered data paths, etc. Information is cached in this | |
61 | * structure for use by the if_uba.c routines in running the interface | |
62 | * efficiently. | |
63 | */ | |
64 | struct ec_softc { | |
65 | struct ifnet es_if; /* network-visible interface */ | |
66 | struct ifuba es_ifuba; /* UNIBUS resources */ | |
67 | short es_mask; /* mask for current output delay */ | |
68 | short es_oactive; /* is output active? */ | |
69 | u_char *es_buf[16]; /* virtual addresses of buffers */ | |
70 | u_char es_enaddr[6]; /* board's ethernet address */ | |
71 | } ec_softc[NEC]; | |
72 | ||
73 | /* | |
74 | * Do output DMA to determine interface presence and | |
75 | * interrupt vector. DMA is too short to disturb other hosts. | |
76 | */ | |
77 | ecprobe(reg) | |
78 | caddr_t reg; | |
79 | { | |
80 | register int br, cvec; /* r11, r10 value-result */ | |
81 | register struct ecdevice *addr = (struct ecdevice *)reg; | |
82 | register caddr_t ecbuf = (caddr_t) &umem[numuba][ECMEM]; | |
83 | ||
84 | #ifdef lint | |
85 | br = 0; cvec = br; br = cvec; | |
86 | ecrint(0); ecxint(0); eccollide(0); | |
87 | #endif | |
88 | /* | |
89 | * Make sure memory is turned on | |
90 | */ | |
91 | addr->ec_rcr = EC_AROM; | |
92 | /* | |
93 | * Disable map registers for ec unibus space, | |
94 | * but don't allocate yet. | |
95 | */ | |
96 | (void) ubamem(numuba, ECMEM, 32*2, 0); | |
97 | /* | |
98 | * Check for existence of buffers on Unibus. | |
99 | */ | |
100 | if (badaddr((caddr_t)ecbuf, 2)) { | |
101 | bad1: | |
102 | printf("ec: buffer mem not found\n"); | |
103 | bad2: | |
104 | (void) ubamem(numuba, 0, 0, 0); /* reenable map (780 only) */ | |
105 | addr->ec_rcr = EC_MDISAB; /* disable memory */ | |
106 | return (0); | |
107 | } | |
108 | #if VAX780 | |
109 | if (cpu == VAX_780 && uba_hd[numuba].uh_uba->uba_sr) { | |
110 | uba_hd[numuba].uh_uba->uba_sr = uba_hd[numuba].uh_uba->uba_sr; | |
111 | goto bad1; | |
112 | } | |
113 | #endif | |
114 | ||
115 | /* | |
116 | * Tell the system that the board has memory here, so it won't | |
117 | * attempt to allocate the addresses later. | |
118 | */ | |
119 | if (ubamem(numuba, ECMEM, 32*2, 1) == 0) { | |
120 | printf("ecprobe: cannot reserve uba addresses\n"); | |
121 | goto bad2; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Make a one byte packet in what should be buffer #0. | |
126 | * Submit it for sending. This whould cause an xmit interrupt. | |
127 | * The xmit interrupt vector is 8 bytes after the receive vector, | |
128 | * so adjust for this before returning. | |
129 | */ | |
130 | *(u_short *)ecbuf = (u_short) 03777; | |
131 | ecbuf[03777] = '\0'; | |
132 | addr->ec_xcr = EC_XINTEN|EC_XWBN; | |
133 | DELAY(100000); | |
134 | addr->ec_xcr = EC_XCLR; | |
135 | if (cvec > 0 && cvec != 0x200) { | |
136 | if (cvec & 04) { /* collision interrupt */ | |
137 | cvec -= 04; | |
138 | br += 1; /* rcv is collision + 1 */ | |
139 | } else { /* xmit interrupt */ | |
140 | cvec -= 010; | |
141 | br += 2; /* rcv is xmit + 2 */ | |
142 | } | |
143 | } | |
144 | return (1); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Interface exists: make available by filling in network interface | |
149 | * record. System will initialize the interface when it is ready | |
150 | * to accept packets. | |
151 | */ | |
152 | ecattach(ui) | |
153 | struct uba_device *ui; | |
154 | { | |
155 | struct ec_softc *es = &ec_softc[ui->ui_unit]; | |
156 | register struct ifnet *ifp = &es->es_if; | |
157 | register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr; | |
158 | struct sockaddr_in *sin; | |
159 | int i, j; | |
160 | u_char *cp; | |
161 | ||
162 | ifp->if_unit = ui->ui_unit; | |
163 | ifp->if_name = "ec"; | |
164 | ifp->if_mtu = ETHERMTU; | |
165 | ifp->if_net = ui->ui_flags; | |
166 | ||
167 | /* | |
168 | * Read the ethernet address off the board, one nibble at a time. | |
169 | */ | |
170 | addr->ec_xcr = EC_UECLR; | |
171 | addr->ec_rcr = EC_AROM; | |
172 | cp = es->es_enaddr; | |
173 | #define NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM | |
174 | for (i=0; i<6; i++) { | |
175 | *cp = 0; | |
176 | for (j=0; j<=4; j+=4) { | |
177 | *cp |= ((addr->ec_rcr >> 8) & 0xf) << j; | |
178 | NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT; | |
179 | } | |
180 | cp++; | |
181 | } | |
182 | #ifdef notdef | |
183 | printf("ec%d: addr=%x:%x:%x:%x:%x:%x\n", ui->ui_unit, | |
184 | es->es_enaddr[0]&0xff, es->es_enaddr[1]&0xff, | |
185 | es->es_enaddr[2]&0xff, es->es_enaddr[3]&0xff, | |
186 | es->es_enaddr[4]&0xff, es->es_enaddr[5]&0xff); | |
187 | #endif | |
188 | ifp->if_host[0] = ((es->es_enaddr[3]&0xff)<<16) | | |
189 | ((es->es_enaddr[4]&0xff)<<8) | (es->es_enaddr[5]&0xff); | |
190 | sin = (struct sockaddr_in *)&es->es_if.if_addr; | |
191 | sin->sin_family = AF_INET; | |
192 | sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); | |
193 | ||
194 | sin = (struct sockaddr_in *)&ifp->if_broadaddr; | |
195 | sin->sin_family = AF_INET; | |
196 | sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); | |
197 | ifp->if_flags = IFF_BROADCAST; | |
198 | ||
199 | ifp->if_init = ecinit; | |
200 | ifp->if_output = ecoutput; | |
201 | ifp->if_reset = ecreset; | |
202 | for (i=0; i<16; i++) | |
203 | es->es_buf[i] = (u_char *)&umem[ui->ui_ubanum][ECMEM+2048*i]; | |
204 | if_attach(ifp); | |
205 | } | |
206 | ||
207 | /* | |
208 | * Reset of interface after UNIBUS reset. | |
209 | * If interface is on specified uba, reset its state. | |
210 | */ | |
211 | ecreset(unit, uban) | |
212 | int unit, uban; | |
213 | { | |
214 | register struct uba_device *ui; | |
215 | ||
216 | if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 || | |
217 | ui->ui_ubanum != uban) | |
218 | return; | |
219 | printf(" ec%d", unit); | |
220 | (void) ubamem(uban, ECMEM, 32*2, 0); /* mr disable (no alloc) */ | |
221 | ecinit(unit); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Initialization of interface; clear recorded pending | |
226 | * operations, and reinitialize UNIBUS usage. | |
227 | */ | |
228 | ecinit(unit) | |
229 | int unit; | |
230 | { | |
231 | struct ec_softc *es = &ec_softc[unit]; | |
232 | struct ecdevice *addr; | |
233 | int i, s; | |
234 | ||
235 | /* | |
236 | * Hang receive buffers and start any pending writes. | |
237 | * Writing into the rcr also makes sure the memory | |
238 | * is turned on. | |
239 | */ | |
240 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; | |
241 | s = splimp(); | |
242 | for (i=ECRHBF; i>=ECRLBF; i--) | |
243 | addr->ec_rcr = EC_READ|i; | |
244 | es->es_oactive = 0; | |
245 | es->es_mask = ~0; | |
246 | es->es_if.if_flags |= IFF_UP; | |
247 | if (es->es_if.if_snd.ifq_head) | |
248 | ecstart(unit); | |
249 | splx(s); | |
250 | if_rtinit(&es->es_if, RTF_UP); | |
251 | } | |
252 | ||
253 | /* | |
254 | * Start or restart output on interface. | |
255 | * If interface is already active, then this is a retransmit | |
256 | * after a collision, and just restuff registers. | |
257 | * If interface is not already active, get another datagram | |
258 | * to send off of the interface queue, and map it to the interface | |
259 | * before starting the output. | |
260 | */ | |
261 | ecstart(dev) | |
262 | dev_t dev; | |
263 | { | |
264 | int unit = ECUNIT(dev); | |
265 | struct ec_softc *es = &ec_softc[unit]; | |
266 | struct ecdevice *addr; | |
267 | struct mbuf *m; | |
268 | ||
269 | if (es->es_oactive) | |
270 | goto restart; | |
271 | ||
272 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
273 | if (m == 0) { | |
274 | es->es_oactive = 0; | |
275 | return; | |
276 | } | |
277 | ecput(es->es_buf[ECTBF], m); | |
278 | ||
279 | restart: | |
280 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; | |
281 | addr->ec_xcr = EC_WRITE|ECTBF; | |
282 | es->es_oactive = 1; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Ethernet interface transmitter interrupt. | |
287 | * Start another output if more data to send. | |
288 | */ | |
289 | ecxint(unit) | |
290 | int unit; | |
291 | { | |
292 | register struct ec_softc *es = &ec_softc[unit]; | |
293 | register struct ecdevice *addr = | |
294 | (struct ecdevice *)ecinfo[unit]->ui_addr; | |
295 | ||
296 | if (es->es_oactive == 0) | |
297 | return; | |
298 | if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) { | |
299 | printf("ec%d: stray xmit interrupt, xcr=%b\n", unit, | |
300 | addr->ec_xcr, EC_XBITS); | |
301 | es->es_oactive = 0; | |
302 | addr->ec_xcr = EC_XCLR; | |
303 | return; | |
304 | } | |
305 | es->es_if.if_opackets++; | |
306 | es->es_oactive = 0; | |
307 | es->es_mask = ~0; | |
308 | addr->ec_xcr = EC_XCLR; | |
309 | if (es->es_if.if_snd.ifq_head) | |
310 | ecstart(unit); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Collision on ethernet interface. Do exponential | |
315 | * backoff, and retransmit. If have backed off all | |
316 | * the way print warning diagnostic, and drop packet. | |
317 | */ | |
318 | eccollide(unit) | |
319 | int unit; | |
320 | { | |
321 | struct ec_softc *es = &ec_softc[unit]; | |
322 | ||
323 | es->es_if.if_collisions++; | |
324 | if (es->es_oactive) | |
325 | ecdocoll(unit); | |
326 | } | |
327 | ||
328 | ecdocoll(unit) | |
329 | int unit; | |
330 | { | |
331 | register struct ec_softc *es = &ec_softc[unit]; | |
332 | register struct ecdevice *addr = | |
333 | (struct ecdevice *)ecinfo[unit]->ui_addr; | |
334 | register i; | |
335 | int delay; | |
336 | ||
337 | /* | |
338 | * Es_mask is a 16 bit number with n low zero bits, with | |
339 | * n the number of backoffs. When es_mask is 0 we have | |
340 | * backed off 16 times, and give up. | |
341 | */ | |
342 | if (es->es_mask == 0) { | |
343 | es->es_if.if_oerrors++; | |
344 | printf("ec%d: send error\n", unit); | |
345 | /* | |
346 | * Reset interface, then requeue rcv buffers. | |
347 | * Some incoming packets may be lost, but that | |
348 | * can't be helped. | |
349 | */ | |
350 | addr->ec_xcr = EC_UECLR; | |
351 | for (i=ECRHBF; i>=ECRLBF; i--) | |
352 | addr->ec_rcr = EC_READ|i; | |
353 | /* | |
354 | * Reset and transmit next packet (if any). | |
355 | */ | |
356 | es->es_oactive = 0; | |
357 | es->es_mask = ~0; | |
358 | if (es->es_if.if_snd.ifq_head) | |
359 | ecstart(unit); | |
360 | return; | |
361 | } | |
362 | /* | |
363 | * Do exponential backoff. Compute delay based on low bits | |
364 | * of the interval timer. Then delay for that number of | |
365 | * slot times. A slot time is 51.2 microseconds (rounded to 51). | |
366 | * This does not take into account the time already used to | |
367 | * process the interrupt. | |
368 | */ | |
369 | es->es_mask <<= 1; | |
370 | delay = mfpr(ICR) &~ es->es_mask; | |
371 | DELAY(delay * 51); | |
372 | /* | |
373 | * Clear the controller's collision flag, thus enabling retransmit. | |
374 | */ | |
375 | addr->ec_xcr = EC_CLEAR; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Ethernet interface receiver interrupt. | |
380 | * If input error just drop packet. | |
381 | * Otherwise purge input buffered data path and examine | |
382 | * packet to determine type. If can't determine length | |
383 | * from type, then have to drop packet. Othewise decapsulate | |
384 | * packet based on type and pass to type specific higher-level | |
385 | * input routine. | |
386 | */ | |
387 | ecrint(unit) | |
388 | int unit; | |
389 | { | |
390 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; | |
391 | ||
392 | while (addr->ec_rcr & EC_RDONE) | |
393 | ecread(unit); | |
394 | } | |
395 | ||
396 | ecread(unit) | |
397 | int unit; | |
398 | { | |
399 | register struct ec_softc *es = &ec_softc[unit]; | |
400 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; | |
401 | register struct ether_header *ec; | |
402 | struct mbuf *m; | |
403 | int len, off, resid, ecoff, rbuf; | |
404 | register struct ifqueue *inq; | |
405 | u_char *ecbuf; | |
406 | ||
407 | es->es_if.if_ipackets++; | |
408 | rbuf = addr->ec_rcr & EC_RBN; | |
409 | if (rbuf < ECRLBF || rbuf > ECRHBF) | |
410 | panic("ecrint"); | |
411 | ecbuf = es->es_buf[rbuf]; | |
412 | ecoff = *(short *)ecbuf; | |
413 | if (ecoff <= ECRDOFF || ecoff > 2046) { | |
414 | es->es_if.if_ierrors++; | |
415 | #ifdef notdef | |
416 | if (es->es_if.if_ierrors % 100 == 0) | |
417 | printf("ec%d: += 100 input errors\n", unit); | |
418 | #endif | |
419 | goto setup; | |
420 | } | |
421 | ||
422 | /* | |
423 | * Get input data length. | |
424 | * Get pointer to ethernet header (in input buffer). | |
425 | * Deal with trailer protocol: if type is PUP trailer | |
426 | * get true type from first 16-bit word past data. | |
427 | * Remember that type was trailer by setting off. | |
428 | */ | |
429 | len = ecoff - ECRDOFF - sizeof (struct ether_header); | |
430 | ec = (struct ether_header *)(ecbuf + ECRDOFF); | |
431 | ec->ether_type = ntohs((u_short)ec->ether_type); | |
432 | #define ecdataaddr(ec, off, type) ((type)(((caddr_t)((ec)+1)+(off)))) | |
433 | if (ec->ether_type >= ETHERPUP_TRAIL && | |
434 | ec->ether_type < ETHERPUP_TRAIL+ETHERPUP_NTRAILER) { | |
435 | off = (ec->ether_type - ETHERPUP_TRAIL) * 512; | |
436 | if (off >= ETHERMTU) | |
437 | goto setup; /* sanity */ | |
438 | ec->ether_type = ntohs(*ecdataaddr(ec, off, u_short *)); | |
439 | resid = ntohs(*(ecdataaddr(ec, off+2, u_short *))); | |
440 | if (off + resid > len) | |
441 | goto setup; /* sanity */ | |
442 | len = off + resid; | |
443 | } else | |
444 | off = 0; | |
445 | if (len == 0) | |
446 | goto setup; | |
447 | ||
448 | /* | |
449 | * Pull packet off interface. Off is nonzero if packet | |
450 | * has trailing header; ecget will then force this header | |
451 | * information to be at the front, but we still have to drop | |
452 | * the type and length which are at the front of any trailer data. | |
453 | */ | |
454 | m = ecget(ecbuf, len, off); | |
455 | if (m == 0) | |
456 | goto setup; | |
457 | if (off) { | |
458 | m->m_off += 2 * sizeof (u_short); | |
459 | m->m_len -= 2 * sizeof (u_short); | |
460 | } | |
461 | switch (ec->ether_type) { | |
462 | ||
463 | #ifdef INET | |
464 | case ETHERPUP_IPTYPE: | |
465 | schednetisr(NETISR_IP); | |
466 | inq = &ipintrq; | |
467 | break; | |
468 | #endif | |
469 | default: | |
470 | m_freem(m); | |
471 | goto setup; | |
472 | } | |
473 | ||
474 | if (IF_QFULL(inq)) { | |
475 | IF_DROP(inq); | |
476 | m_freem(m); | |
477 | goto setup; | |
478 | } | |
479 | IF_ENQUEUE(inq, m); | |
480 | ||
481 | setup: | |
482 | /* | |
483 | * Reset for next packet. | |
484 | */ | |
485 | addr->ec_rcr = EC_READ|EC_RCLR|rbuf; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Ethernet output routine. | |
490 | * Encapsulate a packet of type family for the local net. | |
491 | * Use trailer local net encapsulation if enough data in first | |
492 | * packet leaves a multiple of 512 bytes of data in remainder. | |
493 | * If destination is this address or broadcast, send packet to | |
494 | * loop device to kludge around the fact that 3com interfaces can't | |
495 | * talk to themselves. | |
496 | */ | |
497 | ecoutput(ifp, m0, dst) | |
498 | struct ifnet *ifp; | |
499 | struct mbuf *m0; | |
500 | struct sockaddr *dst; | |
501 | { | |
502 | int type, dest, s, error; | |
503 | register struct ec_softc *es = &ec_softc[ifp->if_unit]; | |
504 | register struct mbuf *m = m0; | |
505 | register struct ether_header *ec; | |
506 | register int off, i; | |
507 | struct mbuf *mcopy = (struct mbuf *) 0; /* Null */ | |
508 | ||
509 | switch (dst->sa_family) { | |
510 | ||
511 | #ifdef INET | |
512 | case AF_INET: | |
513 | dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; | |
514 | if ((dest &~ 0xff) == 0) | |
515 | mcopy = m_copy(m, 0, (int)M_COPYALL); | |
516 | else if (dest == ((struct sockaddr_in *)&es->es_if.if_addr)-> | |
517 | sin_addr.s_addr) { | |
518 | mcopy = m; | |
519 | goto gotlocal; | |
520 | } | |
521 | off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; | |
522 | if (off > 0 && (off & 0x1ff) == 0 && | |
523 | m->m_off >= MMINOFF + 2 * sizeof (u_short)) { | |
524 | type = ETHERPUP_TRAIL + (off>>9); | |
525 | m->m_off -= 2 * sizeof (u_short); | |
526 | m->m_len += 2 * sizeof (u_short); | |
527 | *mtod(m, u_short *) = ntohs((u_short)ETHERPUP_IPTYPE); | |
528 | *(mtod(m, u_short *) + 1) = ntohs((u_short)m->m_len); | |
529 | goto gottrailertype; | |
530 | } | |
531 | type = ETHERPUP_IPTYPE; | |
532 | off = 0; | |
533 | goto gottype; | |
534 | #endif | |
535 | ||
536 | default: | |
537 | printf("ec%d: can't handle af%d\n", ifp->if_unit, | |
538 | dst->sa_family); | |
539 | error = EAFNOSUPPORT; | |
540 | goto bad; | |
541 | } | |
542 | ||
543 | gottrailertype: | |
544 | /* | |
545 | * Packet to be sent as trailer: move first packet | |
546 | * (control information) to end of chain. | |
547 | */ | |
548 | while (m->m_next) | |
549 | m = m->m_next; | |
550 | m->m_next = m0; | |
551 | m = m0->m_next; | |
552 | m0->m_next = 0; | |
553 | m0 = m; | |
554 | ||
555 | gottype: | |
556 | /* | |
557 | * Add local net header. If no space in first mbuf, | |
558 | * allocate another. | |
559 | */ | |
560 | if (m->m_off > MMAXOFF || | |
561 | MMINOFF + sizeof (struct ether_header) > m->m_off) { | |
562 | m = m_get(M_DONTWAIT, MT_HEADER); | |
563 | if (m == 0) { | |
564 | error = ENOBUFS; | |
565 | goto bad; | |
566 | } | |
567 | m->m_next = m0; | |
568 | m->m_off = MMINOFF; | |
569 | m->m_len = sizeof (struct ether_header); | |
570 | } else { | |
571 | m->m_off -= sizeof (struct ether_header); | |
572 | m->m_len += sizeof (struct ether_header); | |
573 | } | |
574 | ec = mtod(m, struct ether_header *); | |
575 | bcopy((caddr_t)es->es_enaddr, (caddr_t)ec->ether_shost, 6); | |
576 | if ((dest &~ 0xff) == 0) | |
577 | bcopy((caddr_t)ecbroadcastaddr, (caddr_t)ec->ether_dhost, 6); | |
578 | else { | |
579 | u_char *to = dest & 0x8000 ? ec_iltop : es->es_enaddr; | |
580 | ||
581 | bcopy((caddr_t)to, (caddr_t)ec->ether_dhost, 3); | |
582 | ec->ether_dhost[3] = (dest>>8) & 0x7f; | |
583 | ec->ether_dhost[4] = (dest>>16) & 0xff; | |
584 | ec->ether_dhost[5] = (dest>>24) & 0xff; | |
585 | } | |
586 | ec->ether_type = htons((u_short)type); | |
587 | ||
588 | /* | |
589 | * Queue message on interface, and start output if interface | |
590 | * not yet active. | |
591 | */ | |
592 | s = splimp(); | |
593 | if (IF_QFULL(&ifp->if_snd)) { | |
594 | IF_DROP(&ifp->if_snd); | |
595 | error = ENOBUFS; | |
596 | goto qfull; | |
597 | } | |
598 | IF_ENQUEUE(&ifp->if_snd, m); | |
599 | if (es->es_oactive == 0) | |
600 | ecstart(ifp->if_unit); | |
601 | splx(s); | |
602 | ||
603 | gotlocal: | |
604 | return(mcopy ? looutput(&loif, mcopy, dst) : 0); | |
605 | ||
606 | qfull: | |
607 | m0 = m; | |
608 | splx(s); | |
609 | bad: | |
610 | m_freem(m0); | |
611 | return(error); | |
612 | } | |
613 | ||
614 | /* | |
615 | * Routine to copy from mbuf chain to transmit | |
616 | * buffer in UNIBUS memory. | |
617 | * If packet size is less than the minimum legal size, | |
618 | * the buffer is expanded. We probably should zero out the extra | |
619 | * bytes for security, but that would slow things down. | |
620 | */ | |
621 | ecput(ecbuf, m) | |
622 | u_char *ecbuf; | |
623 | struct mbuf *m; | |
624 | { | |
625 | register struct mbuf *mp; | |
626 | register int off; | |
627 | u_char *bp; | |
628 | ||
629 | for (off = 2048, mp = m; mp; mp = mp->m_next) | |
630 | off -= mp->m_len; | |
631 | if (2048 - off < ETHERMIN + sizeof (struct ether_header)) | |
632 | off = 2048 - ETHERMIN - sizeof (struct ether_header); | |
633 | *(u_short *)ecbuf = off; | |
634 | bp = (u_char *)(ecbuf + off); | |
635 | for (mp = m; mp; mp = mp->m_next) { | |
636 | register unsigned len = mp->m_len; | |
637 | u_char *mcp; | |
638 | ||
639 | if (len == 0) | |
640 | continue; | |
641 | mcp = mtod(mp, u_char *); | |
642 | if ((unsigned)bp & 01) { | |
643 | *bp++ = *mcp++; | |
644 | len--; | |
645 | } | |
646 | if (off = (len >> 1)) { | |
647 | register u_short *to, *from; | |
648 | ||
649 | to = (u_short *)bp; | |
650 | from = (u_short *)mcp; | |
651 | do | |
652 | *to++ = *from++; | |
653 | while (--off > 0); | |
654 | bp = (u_char *)to, | |
655 | mcp = (u_char *)from; | |
656 | } | |
657 | if (len & 01) | |
658 | *bp++ = *mcp++; | |
659 | } | |
660 | m_freem(m); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Routine to copy from UNIBUS memory into mbufs. | |
665 | * Similar in spirit to if_rubaget. | |
666 | * | |
667 | * Warning: This makes the fairly safe assumption that | |
668 | * mbufs have even lengths. | |
669 | */ | |
670 | struct mbuf * | |
671 | ecget(ecbuf, totlen, off0) | |
672 | u_char *ecbuf; | |
673 | int totlen, off0; | |
674 | { | |
675 | register struct mbuf *m; | |
676 | struct mbuf *top = 0, **mp = ⊤ | |
677 | register int off = off0, len; | |
678 | u_char *cp; | |
679 | ||
680 | cp = ecbuf + ECRDOFF + sizeof (struct ether_header); | |
681 | while (totlen > 0) { | |
682 | register int words; | |
683 | u_char *mcp; | |
684 | ||
685 | MGET(m, M_DONTWAIT, MT_DATA); | |
686 | if (m == 0) | |
687 | goto bad; | |
688 | if (off) { | |
689 | len = totlen - off; | |
690 | cp = ecbuf + ECRDOFF + | |
691 | sizeof (struct ether_header) + off; | |
692 | } else | |
693 | len = totlen; | |
694 | if (len >= CLBYTES) { | |
695 | struct mbuf *p; | |
696 | ||
697 | MCLGET(p, 1); | |
698 | if (p != 0) { | |
699 | m->m_len = len = CLBYTES; | |
700 | m->m_off = (int)p - (int)m; | |
701 | } else { | |
702 | m->m_len = len = MIN(MLEN, len); | |
703 | m->m_off = MMINOFF; | |
704 | } | |
705 | } else { | |
706 | m->m_len = len = MIN(MLEN, len); | |
707 | m->m_off = MMINOFF; | |
708 | } | |
709 | mcp = mtod(m, u_char *); | |
710 | if (words = (len >> 1)) { | |
711 | register u_short *to, *from; | |
712 | ||
713 | to = (u_short *)mcp; | |
714 | from = (u_short *)cp; | |
715 | do | |
716 | *to++ = *from++; | |
717 | while (--words > 0); | |
718 | mcp = (u_char *)to; | |
719 | cp = (u_char *)from; | |
720 | } | |
721 | if (len & 01) | |
722 | *mcp++ = *cp++; | |
723 | *mp = m; | |
724 | mp = &m->m_next; | |
725 | if (off == 0) { | |
726 | totlen -= len; | |
727 | continue; | |
728 | } | |
729 | off += len; | |
730 | if (off == totlen) { | |
731 | cp = ecbuf + ECRDOFF + sizeof (struct ether_header); | |
732 | off = 0; | |
733 | totlen = off0; | |
734 | } | |
735 | } | |
736 | return (top); | |
737 | bad: | |
738 | m_freem(top); | |
739 | return (0); | |
740 | } |