1 /* if_en.c 4.48 82/04/01 */ 2 3 #include "en.h" 4 #include "imp.h" 5 6 /* 7 * Xerox prototype (3 Mb) Ethernet interface driver. 8 */ 9 10 #include "../h/param.h" 11 #include "../h/systm.h" 12 #include "../h/mbuf.h" 13 #include "../h/pte.h" 14 #include "../h/buf.h" 15 #include "../h/protosw.h" 16 #include "../h/socket.h" 17 #include "../h/ubareg.h" 18 #include "../h/ubavar.h" 19 #include "../h/enreg.h" 20 #include "../h/cpu.h" 21 #include "../h/mtpr.h" 22 #include "../h/vmmac.h" 23 #include "../net/in.h" 24 #include "../net/in_systm.h" 25 #include "../net/if.h" 26 #include "../net/if_en.h" 27 #include "../net/if_uba.h" 28 #include "../net/ip.h" 29 #include "../net/ip_var.h" 30 #include "../net/pup.h" 31 #include "../net/route.h" 32 33 #define ENMTU (1024+512) 34 35 int enprobe(), enattach(), enrint(), enxint(), encollide(); 36 struct uba_device *eninfo[NEN]; 37 u_short enstd[] = { 0 }; 38 struct uba_driver endriver = 39 { enprobe, 0, enattach, 0, enstd, "en", eninfo }; 40 #define ENUNIT(x) minor(x) 41 42 int eninit(),enoutput(),enreset(); 43 44 /* 45 * Ethernet software status per interface. 46 * 47 * Each interface is referenced by a network interface structure, 48 * es_if, which the routing code uses to locate the interface. 49 * This structure contains the output queue for the interface, its address, ... 50 * We also have, for each interface, a UBA interface structure, which 51 * contains information about the UNIBUS resources held by the interface: 52 * map registers, buffered data paths, etc. Information is cached in this 53 * structure for use by the if_uba.c routines in running the interface 54 * efficiently. 55 */ 56 struct en_softc { 57 struct ifnet es_if; /* network-visible interface */ 58 struct ifuba es_ifuba; /* UNIBUS resources */ 59 short es_delay; /* current output delay */ 60 short es_mask; /* mask for current output delay */ 61 u_char es_lastx; /* host last transmitted to */ 62 short es_oactive; /* is output active? */ 63 short es_olen; /* length of last output */ 64 } en_softc[NEN]; 65 66 /* 67 * Do output DMA to determine interface presence and 68 * interrupt vector. DMA is too short to disturb other hosts. 69 */ 70 enprobe(reg) 71 caddr_t reg; 72 { 73 register int br, cvec; /* r11, r10 value-result */ 74 register struct endevice *addr = (struct endevice *)reg; 75 76 COUNT(ENPROBE); 77 #ifdef lint 78 br = 0; cvec = br; br = cvec; 79 enrint(0); enxint(0); encollide(0); 80 #endif 81 addr->en_istat = 0; 82 addr->en_owc = -1; 83 addr->en_oba = 0; 84 addr->en_ostat = EN_IEN|EN_GO; 85 DELAY(100000); 86 addr->en_ostat = 0; 87 return (1); 88 } 89 90 /* 91 * Interface exists: make available by filling in network interface 92 * record. System will initialize the interface when it is ready 93 * to accept packets. 94 */ 95 enattach(ui) 96 struct uba_device *ui; 97 { 98 register struct en_softc *es = &en_softc[ui->ui_unit]; 99 register struct sockaddr_in *sin; 100 COUNT(ENATTACH); 101 102 es->es_if.if_unit = ui->ui_unit; 103 es->es_if.if_name = "en"; 104 es->es_if.if_mtu = ENMTU; 105 es->es_if.if_net = ui->ui_flags & 0xffff; 106 es->es_if.if_host[0] = 107 (~(((struct endevice *)eninfo[ui->ui_unit]->ui_addr)->en_addr)) & 0xff; 108 sin = (struct sockaddr_in *)&es->es_if.if_addr; 109 sin->sin_family = AF_INET; 110 sin->sin_addr = if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); 111 sin = (struct sockaddr_in *)&es->es_if.if_broadaddr; 112 sin->sin_family = AF_INET; 113 sin->sin_addr = if_makeaddr(es->es_if.if_net, 0); 114 es->es_if.if_flags = IFF_BROADCAST; 115 es->es_if.if_init = eninit; 116 es->es_if.if_output = enoutput; 117 es->es_if.if_ubareset = enreset; 118 es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16; 119 if_attach(&es->es_if); 120 #if NIMP == 0 121 /* here's one for you john baby.... */ 122 enlhinit((ui->ui_flags &~ 0xff) | 0x0a); 123 #endif 124 } 125 126 /* 127 * Reset of interface after UNIBUS reset. 128 * If interface is on specified uba, reset its state. 129 */ 130 enreset(unit, uban) 131 int unit, uban; 132 { 133 register struct uba_device *ui; 134 COUNT(ENRESET); 135 136 if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || 137 ui->ui_ubanum != uban) 138 return; 139 printf(" en%d", unit); 140 eninit(unit); 141 } 142 143 /* 144 * Initialization of interface; clear recorded pending 145 * operations, and reinitialize UNIBUS usage. 146 */ 147 eninit(unit) 148 int unit; 149 { 150 register struct en_softc *es = &en_softc[unit]; 151 register struct uba_device *ui = eninfo[unit]; 152 register struct endevice *addr; 153 int s; 154 155 if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, 156 sizeof (struct en_header), (int)btoc(ENMTU)) == 0) { 157 printf("en%d: can't initialize\n", unit); 158 es->es_if.if_flags &= ~IFF_UP; 159 return; 160 } 161 addr = (struct endevice *)ui->ui_addr; 162 addr->en_istat = addr->en_ostat = 0; 163 164 /* 165 * Hang a receive and start any 166 * pending writes by faking a transmit complete. 167 */ 168 s = splimp(); 169 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 170 addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; 171 addr->en_istat = EN_IEN|EN_GO; 172 es->es_oactive = 1; 173 es->es_if.if_flags |= IFF_UP; 174 enxint(unit); 175 splx(s); 176 if_rtinit(&es->es_if, RTF_DIRECT|RTF_UP); 177 } 178 179 int enlastdel = 25; 180 181 /* 182 * Start or restart output on interface. 183 * If interface is already active, then this is a retransmit 184 * after a collision, and just restuff registers and delay. 185 * If interface is not already active, get another datagram 186 * to send off of the interface queue, and map it to the interface 187 * before starting the output. 188 */ 189 enstart(dev) 190 dev_t dev; 191 { 192 int unit = ENUNIT(dev); 193 struct uba_device *ui = eninfo[unit]; 194 register struct en_softc *es = &en_softc[unit]; 195 register struct endevice *addr; 196 struct mbuf *m; 197 int dest; 198 COUNT(ENSTART); 199 200 if (es->es_oactive) 201 goto restart; 202 203 /* 204 * Not already active: dequeue another request 205 * and map it to the UNIBUS. If no more requests, 206 * just return. 207 */ 208 IF_DEQUEUE(&es->es_if.if_snd, m); 209 if (m == 0) { 210 es->es_oactive = 0; 211 return; 212 } 213 dest = mtod(m, struct en_header *)->en_dhost; 214 es->es_olen = if_wubaput(&es->es_ifuba, m); 215 216 /* 217 * Ethernet cannot take back-to-back packets (no 218 * buffering in interface. To avoid overrunning 219 * receiver, enforce a small delay (about 1ms) in interface 220 * on successive packets sent to same host. 221 */ 222 if (es->es_lastx && es->es_lastx == dest) 223 es->es_delay = enlastdel; 224 else 225 es->es_lastx = dest; 226 227 restart: 228 /* 229 * Have request mapped to UNIBUS for transmission. 230 * Purge any stale data from this BDP, and start the otput. 231 */ 232 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 233 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); 234 addr = (struct endevice *)ui->ui_addr; 235 addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; 236 addr->en_odelay = es->es_delay; 237 addr->en_owc = -((es->es_olen + 1) >> 1); 238 addr->en_ostat = EN_IEN|EN_GO; 239 es->es_oactive = 1; 240 } 241 242 /* 243 * Ethernet interface transmitter interrupt. 244 * Start another output if more data to send. 245 */ 246 enxint(unit) 247 int unit; 248 { 249 register struct uba_device *ui = eninfo[unit]; 250 register struct en_softc *es = &en_softc[unit]; 251 register struct endevice *addr = (struct endevice *)ui->ui_addr; 252 COUNT(ENXINT); 253 254 if (es->es_oactive == 0) 255 return; 256 if (es->es_mask && (addr->en_ostat&EN_OERROR)) { 257 es->es_if.if_oerrors++; 258 if (es->es_if.if_oerrors % 100 == 0) 259 printf("en%d: += 100 output errors\n", unit); 260 endocoll(unit); 261 return; 262 } 263 es->es_if.if_opackets++; 264 es->es_oactive = 0; 265 es->es_delay = 0; 266 es->es_mask = ~0; 267 if (es->es_ifuba.ifu_xtofree) { 268 m_freem(es->es_ifuba.ifu_xtofree); 269 es->es_ifuba.ifu_xtofree = 0; 270 } 271 if (es->es_if.if_snd.ifq_head == 0) { 272 es->es_lastx = 0; 273 return; 274 } 275 enstart(unit); 276 } 277 278 /* 279 * Collision on ethernet interface. Do exponential 280 * backoff, and retransmit. If have backed off all 281 * the way print warning diagnostic, and drop packet. 282 */ 283 encollide(unit) 284 int unit; 285 { 286 struct en_softc *es = &en_softc[unit]; 287 COUNT(ENCOLLIDE); 288 289 es->es_if.if_collisions++; 290 if (es->es_oactive == 0) 291 return; 292 endocoll(unit); 293 } 294 295 endocoll(unit) 296 int unit; 297 { 298 register struct en_softc *es = &en_softc[unit]; 299 300 /* 301 * Es_mask is a 16 bit number with n low zero bits, with 302 * n the number of backoffs. When es_mask is 0 we have 303 * backed off 16 times, and give up. 304 */ 305 if (es->es_mask == 0) { 306 printf("en%d: send error\n", unit); 307 enxint(unit); 308 return; 309 } 310 /* 311 * Another backoff. Restart with delay based on n low bits 312 * of the interval timer. 313 */ 314 es->es_mask <<= 1; 315 es->es_delay = mfpr(ICR) &~ es->es_mask; 316 enstart(unit); 317 } 318 319 struct sockaddr_pup pupsrc = { AF_PUP }; 320 struct sockaddr_pup pupdst = { AF_PUP }; 321 struct sockproto pupproto = { PF_PUP }; 322 /* 323 * Ethernet interface receiver interrupt. 324 * If input error just drop packet. 325 * Otherwise purge input buffered data path and examine 326 * packet to determine type. If can't determine length 327 * from type, then have to drop packet. Othewise decapsulate 328 * packet based on type and pass to type specific higher-level 329 * input routine. 330 */ 331 enrint(unit) 332 int unit; 333 { 334 register struct en_softc *es = &en_softc[unit]; 335 struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; 336 register struct en_header *en; 337 struct mbuf *m; 338 int len; 339 register struct ifqueue *inq; 340 int off; 341 COUNT(ENRINT); 342 343 es->es_if.if_ipackets++; 344 345 /* 346 * Purge BDP; drop if input error indicated. 347 */ 348 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 349 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); 350 if (addr->en_istat&EN_IERROR) { 351 es->es_if.if_ierrors++; 352 if (es->es_if.if_ierrors % 100 == 0) 353 printf("en%d: += 100 input errors\n", unit); 354 goto setup; 355 } 356 357 /* 358 * Get pointer to ethernet header (in input buffer). 359 * Deal with trailer protocol: if type is PUP trailer 360 * get true type from first 16-bit word past data. 361 * Remember that type was trailer by setting off. 362 */ 363 en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); 364 #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) 365 if (en->en_type >= ENPUP_TRAIL && 366 en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { 367 off = (en->en_type - ENPUP_TRAIL) * 512; 368 if (off >= ENMTU) 369 goto setup; /* sanity */ 370 en->en_type = *endataaddr(en, off, u_short *); 371 } else 372 off = 0; 373 374 /* 375 * Attempt to infer packet length from type; 376 * can't deal with packet if can't infer length. 377 */ 378 switch (en->en_type) { 379 380 #ifdef INET 381 case ENPUP_IPTYPE: 382 len = htons((u_short)endataaddr(en, 383 off ? off + sizeof (u_short) : 0, struct ip *)->ip_len); 384 break; 385 #endif 386 #ifdef PUP 387 case ENPUP_PUPTYPE: 388 len = endataaddr(en, off ? off + sizeof (u_short) : 0, 389 struct pup_header *)->pup_length; 390 break; 391 #endif 392 393 default: 394 printf("en%d: unknown pkt type 0x%x\n", unit, en->en_type); 395 goto setup; 396 } 397 if (off) 398 len += sizeof (u_short); 399 if (len == 0) 400 goto setup; 401 402 /* 403 * Pull packet off interface. Off is nonzero if packet 404 * has trailing header; if_rubaget will then force this header 405 * information to be at the front, but we still have to drop 406 * the two-byte type which is at the front of any trailer data. 407 */ 408 m = if_rubaget(&es->es_ifuba, len, off); 409 if (m == 0) 410 goto setup; 411 if (off) { 412 m->m_off += sizeof (u_short); 413 m->m_len -= sizeof (u_short); 414 } 415 switch (en->en_type) { 416 417 #ifdef INET 418 case ENPUP_IPTYPE: 419 schednetisr(NETISR_IP); 420 inq = &ipintrq; 421 break; 422 #endif 423 #ifdef PUP 424 case ENPUP_PUPTYPE: { 425 struct pup_header *pup = mtod(m, struct pup_header *); 426 427 pupproto.sp_protocol = pup->pup_type; 428 pupdst.spup_addr = pup->pup_dport; 429 pupsrc.spup_addr = pup->pup_sport; 430 raw_input(m, &pupproto, (struct sockaddr *)&pupdst, 431 (struct sockaddr *)&pupsrc); 432 goto setup; 433 } 434 #endif 435 } 436 437 if (IF_QFULL(inq)) { 438 IF_DROP(inq); 439 m_freem(m); 440 } else 441 IF_ENQUEUE(inq, m); 442 443 setup: 444 /* 445 * Reset for next packet. 446 */ 447 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 448 addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; 449 addr->en_istat = EN_IEN|EN_GO; 450 } 451 452 /* 453 * Ethernet output routine. 454 * Encapsulate a packet of type family for the local net. 455 * Use trailer local net encapsulation if enough data in first 456 * packet leaves a multiple of 512 bytes of data in remainder. 457 */ 458 enoutput(ifp, m0, dst) 459 struct ifnet *ifp; 460 struct mbuf *m0; 461 struct sockaddr *dst; 462 { 463 int type, dest, s; 464 register struct mbuf *m = m0; 465 register struct en_header *en; 466 register int off; 467 468 COUNT(ENOUTPUT); 469 switch (dst->sa_family) { 470 471 #ifdef INET 472 case AF_INET: 473 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr >> 24; 474 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 475 if (off > 0 && (off & 0x1ff) == 0 && 476 m->m_off >= MMINOFF + sizeof (u_short)) { 477 type = ENPUP_TRAIL + (off>>9); 478 m->m_off -= sizeof (u_short); 479 m->m_len += sizeof (u_short); 480 *mtod(m, u_short *) = ENPUP_IPTYPE; 481 goto gottrailertype; 482 } 483 type = ENPUP_IPTYPE; 484 off = 0; 485 goto gottype; 486 #endif 487 #ifdef PUP 488 case AF_PUP: 489 dest = ((struct sockaddr_pup *)dst)->spup_addr.pp_host; 490 off = mtod(m, struct pup_header *)->pup_length - m->m_len; 491 if (off > 0 && (off & 0x1ff) == 0 && 492 m->m_off >= MMINOFF + sizeof (u_short)) { 493 type = ENPUP_TRAIL + (off>>9); 494 m->m_off -= sizeof (u_short); 495 m->m_len += sizeof (u_short); 496 *mtod(m, u_short *) = ENPUP_PUPTYPE; 497 goto gottrailertype; 498 } 499 type = ENPUP_PUPTYPE; 500 off = 0; 501 goto gottype; 502 #endif 503 504 default: 505 printf("en%d: can't handle af%d\n", ifp->if_unit, 506 dst->sa_family); 507 m_freem(m0); 508 return (0); 509 } 510 511 gottrailertype: 512 /* 513 * Packet to be sent as trailer: move first packet 514 * (control information) to end of chain. 515 */ 516 while (m->m_next) 517 m = m->m_next; 518 m->m_next = m0; 519 m = m0->m_next; 520 m0->m_next = 0; 521 m0 = m; 522 523 gottype: 524 /* 525 * Add local net header. If no space in first mbuf, 526 * allocate another. 527 */ 528 if (m->m_off > MMAXOFF || 529 MMINOFF + sizeof (struct en_header) > m->m_off) { 530 m = m_get(M_DONTWAIT); 531 if (m == 0) { 532 m_freem(m0); 533 return (0); 534 } 535 m->m_next = m0; 536 m->m_off = MMINOFF; 537 m->m_len = sizeof (struct en_header); 538 } else { 539 m->m_off -= sizeof (struct en_header); 540 m->m_len += sizeof (struct en_header); 541 } 542 en = mtod(m, struct en_header *); 543 en->en_shost = ifp->if_host[0]; 544 en->en_dhost = dest; 545 en->en_type = type; 546 547 /* 548 * Queue message on interface, and start output if interface 549 * not yet active. 550 */ 551 s = splimp(); 552 if (IF_QFULL(&ifp->if_snd)) { 553 IF_DROP(&ifp->if_snd); 554 m_freem(m); 555 splx(s); 556 return (0); 557 } 558 IF_ENQUEUE(&ifp->if_snd, m); 559 if (en_softc[ifp->if_unit].es_oactive == 0) 560 enstart(ifp->if_unit); 561 splx(s); 562 return (1); 563 } 564 565 #if NIMP == 0 && NEN > 0 566 /* 567 * Logical host interface driver. 568 * Allows host to appear as an ARPAnet 569 * logical host. Must also have routing 570 * table entry set up to forward packets 571 * to appropriate gateway on localnet. 572 */ 573 574 struct ifnet enlhif; 575 int enlhoutput(); 576 577 /* 578 * Called by localnet interface to allow logical 579 * host interface to "attach". Nothing should ever 580 * be sent locally to this interface, it's purpose 581 * is simply to establish the host's arpanet address. 582 */ 583 enlhinit(addr) 584 int addr; 585 { 586 register struct ifnet *ifp = &enlhif; 587 register struct sockaddr_in *sin; 588 589 COUNT(ENLHINIT); 590 ifp->if_name = "lh"; 591 ifp->if_mtu = ENMTU; 592 sin = (struct sockaddr_in *)&ifp->if_addr; 593 sin->sin_family = AF_INET; 594 sin->sin_addr.s_addr = addr; 595 ifp->if_net = sin->sin_addr.s_net; 596 ifp->if_flags = IFF_UP; 597 ifp->if_output = enlhoutput; /* should never be used */ 598 if_attach(ifp); 599 } 600 601 enlhoutput(ifp, m0, dst) 602 struct ifnet *ifp; 603 struct mbuf *m0; 604 struct sockaddr *dst; 605 { 606 COUNT(ENLHOUTPUT); 607 ifp->if_oerrors++; 608 m_freem(m0); 609 return (0); 610 } 611 #endif 612