1 /* if_en.c 6.1 83/07/29 */ 2 3 #include "en.h" 4 5 /* 6 * Xerox prototype (3 Mb) Ethernet interface driver. 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 "../h/errno.h" 18 #include "../h/ioctl.h" 19 20 #include "../net/if.h" 21 #include "../net/netisr.h" 22 #include "../net/route.h" 23 #include "../netinet/in.h" 24 #include "../netinet/in_systm.h" 25 #include "../netinet/ip.h" 26 #include "../netinet/ip_var.h" 27 #include "../netpup/pup.h" 28 #include "../netpup/ether.h" 29 30 #include "../vax/cpu.h" 31 #include "../vax/mtpr.h" 32 #include "../vaxif/if_en.h" 33 #include "../vaxif/if_enreg.h" 34 #include "../vaxif/if_uba.h" 35 #include "../vaxuba/ubareg.h" 36 #include "../vaxuba/ubavar.h" 37 38 #define ENMTU (1024+512) 39 #define ENMRU (1024+512+16) /* 16 is enough to receive trailer */ 40 41 int enprobe(), enattach(), enrint(), enxint(), encollide(); 42 struct uba_device *eninfo[NEN]; 43 u_short enstd[] = { 0 }; 44 struct uba_driver endriver = 45 { enprobe, 0, enattach, 0, enstd, "en", eninfo }; 46 #define ENUNIT(x) minor(x) 47 48 int eninit(),enoutput(),enreset(),enioctl(); 49 50 #ifdef notdef 51 /* 52 * If you need to byte swap IP's in the system, define 53 * this and do a SIOCSIFFLAGS at boot time. 54 */ 55 #define ENF_SWABIPS 0x100 56 #endif 57 58 /* 59 * Ethernet software status per interface. 60 * 61 * Each interface is referenced by a network interface structure, 62 * es_if, which the routing code uses to locate the interface. 63 * This structure contains the output queue for the interface, its address, ... 64 * We also have, for each interface, a UBA interface structure, which 65 * contains information about the UNIBUS resources held by the interface: 66 * map registers, buffered data paths, etc. Information is cached in this 67 * structure for use by the if_uba.c routines in running the interface 68 * efficiently. 69 */ 70 struct en_softc { 71 struct ifnet es_if; /* network-visible interface */ 72 struct ifuba es_ifuba; /* UNIBUS resources */ 73 short es_delay; /* current output delay */ 74 short es_mask; /* mask for current output delay */ 75 short es_lastx; /* host last transmitted to */ 76 short es_oactive; /* is output active? */ 77 short es_olen; /* length of last output */ 78 } en_softc[NEN]; 79 80 /* 81 * Do output DMA to determine interface presence and 82 * interrupt vector. DMA is too short to disturb other hosts. 83 */ 84 enprobe(reg) 85 caddr_t reg; 86 { 87 register int br, cvec; /* r11, r10 value-result */ 88 register struct endevice *addr = (struct endevice *)reg; 89 90 #ifdef lint 91 br = 0; cvec = br; br = cvec; 92 enrint(0); enxint(0); encollide(0); 93 #endif 94 addr->en_istat = 0; 95 addr->en_owc = -1; 96 addr->en_oba = 0; 97 addr->en_ostat = EN_IEN|EN_GO; 98 DELAY(100000); 99 addr->en_ostat = 0; 100 return (1); 101 } 102 103 /* 104 * Interface exists: make available by filling in network interface 105 * record. System will initialize the interface when it is ready 106 * to accept packets. 107 */ 108 enattach(ui) 109 struct uba_device *ui; 110 { 111 register struct en_softc *es = &en_softc[ui->ui_unit]; 112 113 es->es_if.if_unit = ui->ui_unit; 114 es->es_if.if_name = "en"; 115 es->es_if.if_mtu = ENMTU; 116 es->es_if.if_init = eninit; 117 es->es_if.if_output = enoutput; 118 es->es_if.if_ioctl = enioctl; 119 es->es_if.if_reset = enreset; 120 es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16 | UBA_CANTWAIT; 121 #if defined(VAX750) 122 /* don't chew up 750 bdp's */ 123 if (cpu == VAX_750 && ui->ui_unit > 0) 124 es->es_ifuba.ifu_flags &= ~UBA_NEEDBDP; 125 #endif 126 if_attach(&es->es_if); 127 } 128 129 /* 130 * Reset of interface after UNIBUS reset. 131 * If interface is on specified uba, reset its state. 132 */ 133 enreset(unit, uban) 134 int unit, uban; 135 { 136 register struct uba_device *ui; 137 138 if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || 139 ui->ui_ubanum != uban) 140 return; 141 printf(" en%d", unit); 142 eninit(unit); 143 } 144 145 /* 146 * Initialization of interface; clear recorded pending 147 * operations, and reinitialize UNIBUS usage. 148 */ 149 eninit(unit) 150 int unit; 151 { 152 register struct en_softc *es = &en_softc[unit]; 153 register struct uba_device *ui = eninfo[unit]; 154 register struct endevice *addr; 155 struct sockaddr_in *sin = (struct sockaddr_in *)&es->es_if.if_addr; 156 int s; 157 158 if (in_netof(sin->sin_addr) == 0) 159 return; 160 if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, 161 sizeof (struct en_header), (int)btoc(ENMRU)) == 0) { 162 printf("en%d: can't initialize\n", unit); 163 es->es_if.if_flags &= ~IFF_UP; 164 return; 165 } 166 addr = (struct endevice *)ui->ui_addr; 167 addr->en_istat = addr->en_ostat = 0; 168 169 /* 170 * Hang a receive and start any 171 * pending writes by faking a transmit complete. 172 */ 173 s = splimp(); 174 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 175 addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1; 176 addr->en_istat = EN_IEN|EN_GO; 177 es->es_oactive = 1; 178 es->es_if.if_flags |= IFF_UP|IFF_RUNNING; 179 enxint(unit); 180 splx(s); 181 if_rtinit(&es->es_if, RTF_UP); 182 } 183 184 int enalldelay = 0; 185 int enlastdel = 50; 186 int enlastmask = (~0) << 5; 187 188 /* 189 * Start or restart output on interface. 190 * If interface is already active, then this is a retransmit 191 * after a collision, and just restuff registers and delay. 192 * If interface is not already active, get another datagram 193 * to send off of the interface queue, and map it to the interface 194 * before starting the output. 195 */ 196 enstart(dev) 197 dev_t dev; 198 { 199 int unit = ENUNIT(dev); 200 struct uba_device *ui = eninfo[unit]; 201 register struct en_softc *es = &en_softc[unit]; 202 register struct endevice *addr; 203 struct mbuf *m; 204 int dest; 205 206 if (es->es_oactive) 207 goto restart; 208 209 /* 210 * Not already active: dequeue another request 211 * and map it to the UNIBUS. If no more requests, 212 * just return. 213 */ 214 IF_DEQUEUE(&es->es_if.if_snd, m); 215 if (m == 0) { 216 es->es_oactive = 0; 217 return; 218 } 219 dest = mtod(m, struct en_header *)->en_dhost; 220 es->es_olen = if_wubaput(&es->es_ifuba, m); 221 #ifdef ENF_SWABIPS 222 /* 223 * The Xerox interface does word at a time DMA, so 224 * someone must do byte swapping of user data if high 225 * and low ender machines are to communicate. It doesn't 226 * belong here, but certain people depend on it, so... 227 * 228 * Should swab everybody, but this is a kludge anyway. 229 */ 230 if (es->es_if.if_flags & ENF_SWABIPS) { 231 register struct en_header *en; 232 233 en = (struct en_header *)es->es_ifuba.ifu_w.ifrw_addr; 234 if (en->en_type == ENTYPE_IP) 235 enswab((caddr_t)(en + 1), (caddr_t)(en + 1), 236 es->es_olen - sizeof (struct en_header) + 1); 237 } 238 #endif 239 240 /* 241 * Ethernet cannot take back-to-back packets (no 242 * buffering in interface. To help avoid overrunning 243 * receivers, enforce a small delay (about 1ms) in interface: 244 * * between all packets when enalldelay 245 * * whenever last packet was broadcast 246 * * whenever this packet is to same host as last packet 247 */ 248 if (enalldelay || es->es_lastx == 0 || es->es_lastx == dest) { 249 es->es_delay = enlastdel; 250 es->es_mask = enlastmask; 251 } 252 es->es_lastx = dest; 253 254 restart: 255 /* 256 * Have request mapped to UNIBUS for transmission. 257 * Purge any stale data from this BDP, and start the otput. 258 */ 259 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 260 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); 261 addr = (struct endevice *)ui->ui_addr; 262 addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; 263 addr->en_odelay = es->es_delay; 264 addr->en_owc = -((es->es_olen + 1) >> 1); 265 addr->en_ostat = EN_IEN|EN_GO; 266 es->es_oactive = 1; 267 } 268 269 /* 270 * Ethernet interface transmitter interrupt. 271 * Start another output if more data to send. 272 */ 273 enxint(unit) 274 int unit; 275 { 276 register struct uba_device *ui = eninfo[unit]; 277 register struct en_softc *es = &en_softc[unit]; 278 register struct endevice *addr = (struct endevice *)ui->ui_addr; 279 280 if (es->es_oactive == 0) 281 return; 282 if (es->es_mask && (addr->en_ostat&EN_OERROR)) { 283 es->es_if.if_oerrors++; 284 endocoll(unit); 285 return; 286 } 287 es->es_if.if_opackets++; 288 es->es_oactive = 0; 289 es->es_delay = 0; 290 es->es_mask = ~0; 291 if (es->es_ifuba.ifu_xtofree) { 292 m_freem(es->es_ifuba.ifu_xtofree); 293 es->es_ifuba.ifu_xtofree = 0; 294 } 295 if (es->es_if.if_snd.ifq_head == 0) { 296 es->es_lastx = 256; /* putatively illegal */ 297 return; 298 } 299 enstart(unit); 300 } 301 302 /* 303 * Collision on ethernet interface. Do exponential 304 * backoff, and retransmit. If have backed off all 305 * the way print warning diagnostic, and drop packet. 306 */ 307 encollide(unit) 308 int unit; 309 { 310 struct en_softc *es = &en_softc[unit]; 311 312 es->es_if.if_collisions++; 313 if (es->es_oactive == 0) 314 return; 315 endocoll(unit); 316 } 317 318 endocoll(unit) 319 int unit; 320 { 321 register struct en_softc *es = &en_softc[unit]; 322 323 /* 324 * Es_mask is a 16 bit number with n low zero bits, with 325 * n the number of backoffs. When es_mask is 0 we have 326 * backed off 16 times, and give up. 327 */ 328 if (es->es_mask == 0) { 329 printf("en%d: send error\n", unit); 330 enxint(unit); 331 return; 332 } 333 /* 334 * Another backoff. Restart with delay based on n low bits 335 * of the interval timer. 336 */ 337 es->es_mask <<= 1; 338 es->es_delay = mfpr(ICR) &~ es->es_mask; 339 enstart(unit); 340 } 341 342 #ifdef notdef 343 struct sockproto enproto = { AF_ETHERLINK }; 344 struct sockaddr_en endst = { AF_ETHERLINK }; 345 struct sockaddr_en ensrc = { AF_ETHERLINK }; 346 #endif 347 /* 348 * Ethernet interface receiver interrupt. 349 * If input error just drop packet. 350 * Otherwise purge input buffered data path and examine 351 * packet to determine type. If can't determine length 352 * from type, then have to drop packet. Othewise decapsulate 353 * packet based on type and pass to type specific higher-level 354 * input routine. 355 */ 356 enrint(unit) 357 int unit; 358 { 359 register struct en_softc *es = &en_softc[unit]; 360 struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; 361 register struct en_header *en; 362 struct mbuf *m; 363 int len; short resid; 364 register struct ifqueue *inq; 365 int off; 366 367 es->es_if.if_ipackets++; 368 369 /* 370 * Purge BDP; drop if input error indicated. 371 */ 372 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 373 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); 374 if (addr->en_istat&EN_IERROR) { 375 es->es_if.if_ierrors++; 376 goto setup; 377 } 378 379 /* 380 * Calculate input data length. 381 * Get pointer to ethernet header (in input buffer). 382 * Deal with trailer protocol: if type is PUP trailer 383 * get true type from first 16-bit word past data. 384 * Remember that type was trailer by setting off. 385 */ 386 resid = addr->en_iwc; 387 if (resid) 388 resid |= 0176000; 389 len = (((sizeof (struct en_header) + ENMRU) >> 1) + resid) << 1; 390 len -= sizeof (struct en_header); 391 if (len > ENMRU) 392 goto setup; /* sanity */ 393 en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); 394 en->en_type = ntohs(en->en_type); 395 #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) 396 if (en->en_type >= ENTYPE_TRAIL && 397 en->en_type < ENTYPE_TRAIL+ENTYPE_NTRAILER) { 398 off = (en->en_type - ENTYPE_TRAIL) * 512; 399 if (off > ENMTU) 400 goto setup; /* sanity */ 401 en->en_type = ntohs(*endataaddr(en, off, u_short *)); 402 resid = ntohs(*(endataaddr(en, off+2, u_short *))); 403 if (off + resid > len) 404 goto setup; /* sanity */ 405 len = off + resid; 406 } else 407 off = 0; 408 if (len == 0) 409 goto setup; 410 #ifdef ENF_SWABIPS 411 if (es->es_if.if_flags & ENF_SWABIPS && en->en_type == ENTYPE_IP) 412 enswab((caddr_t)(en + 1), (caddr_t)(en + 1), len); 413 #endif 414 /* 415 * Pull packet off interface. Off is nonzero if packet 416 * has trailing header; if_rubaget will then force this header 417 * information to be at the front, but we still have to drop 418 * the type and length which are at the front of any trailer data. 419 */ 420 m = if_rubaget(&es->es_ifuba, len, off); 421 if (m == 0) 422 goto setup; 423 if (off) { 424 m->m_off += 2 * sizeof (u_short); 425 m->m_len -= 2 * sizeof (u_short); 426 } 427 switch (en->en_type) { 428 429 #ifdef INET 430 case ENTYPE_IP: 431 schednetisr(NETISR_IP); 432 inq = &ipintrq; 433 break; 434 #endif 435 #ifdef PUP 436 case ENTYPE_PUP: 437 rpup_input(m); 438 goto setup; 439 #endif 440 default: 441 #ifdef notdef 442 enproto.sp_protocol = en->en_type; 443 endst.sen_host = en->en_dhost; 444 endst.sen_net = ensrc.sen_net = es->es_if.if_net; 445 ensrc.sen_host = en->en_shost; 446 raw_input(m, &enproto, 447 (struct sockaddr *)&ensrc, (struct sockaddr *)&endst); 448 #else 449 m_freem(m); 450 #endif 451 goto setup; 452 } 453 454 if (IF_QFULL(inq)) { 455 IF_DROP(inq); 456 m_freem(m); 457 } else 458 IF_ENQUEUE(inq, m); 459 460 setup: 461 /* 462 * Reset for next packet. 463 */ 464 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 465 addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1; 466 addr->en_istat = EN_IEN|EN_GO; 467 } 468 469 /* 470 * Ethernet output routine. 471 * Encapsulate a packet of type family for the local net. 472 * Use trailer local net encapsulation if enough data in first 473 * packet leaves a multiple of 512 bytes of data in remainder. 474 */ 475 enoutput(ifp, m0, dst) 476 struct ifnet *ifp; 477 struct mbuf *m0; 478 struct sockaddr *dst; 479 { 480 int type, dest, s, error; 481 register struct mbuf *m = m0; 482 register struct en_header *en; 483 register int off; 484 485 switch (dst->sa_family) { 486 487 #ifdef INET 488 case AF_INET: 489 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 490 if (in_lnaof(*((struct in_addr *)&dest)) >= 0x100) { 491 error = EPERM; /* ??? */ 492 goto bad; 493 } 494 dest = (dest >> 24) & 0xff; 495 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 496 /* need per host negotiation */ 497 if ((ifp->if_flags & IFF_NOTRAILERS) == 0) 498 if (off > 0 && (off & 0x1ff) == 0 && 499 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 500 type = ENTYPE_TRAIL + (off>>9); 501 m->m_off -= 2 * sizeof (u_short); 502 m->m_len += 2 * sizeof (u_short); 503 *mtod(m, u_short *) = htons((u_short)ENTYPE_IP); 504 *(mtod(m, u_short *) + 1) = ntohs((u_short)m->m_len); 505 goto gottrailertype; 506 } 507 type = ENTYPE_IP; 508 off = 0; 509 goto gottype; 510 #endif 511 #ifdef PUP 512 case AF_PUP: 513 dest = ((struct sockaddr_pup *)dst)->spup_host; 514 type = ENTYPE_PUP; 515 off = 0; 516 goto gottype; 517 #endif 518 519 #ifdef notdef 520 case AF_ETHERLINK: 521 goto gotheader; 522 #endif 523 524 default: 525 printf("en%d: can't handle af%d\n", ifp->if_unit, 526 dst->sa_family); 527 error = EAFNOSUPPORT; 528 goto bad; 529 } 530 531 gottrailertype: 532 /* 533 * Packet to be sent as trailer: move first packet 534 * (control information) to end of chain. 535 */ 536 while (m->m_next) 537 m = m->m_next; 538 m->m_next = m0; 539 m = m0->m_next; 540 m0->m_next = 0; 541 m0 = m; 542 543 gottype: 544 /* 545 * Add local net header. If no space in first mbuf, 546 * allocate another. 547 */ 548 if (m->m_off > MMAXOFF || 549 MMINOFF + sizeof (struct en_header) > m->m_off) { 550 m = m_get(M_DONTWAIT, MT_HEADER); 551 if (m == 0) { 552 error = ENOBUFS; 553 goto bad; 554 } 555 m->m_next = m0; 556 m->m_off = MMINOFF; 557 m->m_len = sizeof (struct en_header); 558 } else { 559 m->m_off -= sizeof (struct en_header); 560 m->m_len += sizeof (struct en_header); 561 } 562 en = mtod(m, struct en_header *); 563 en->en_shost = ifp->if_host[0]; 564 en->en_dhost = dest; 565 en->en_type = htons((u_short)type); 566 567 gotheader: 568 /* 569 * Queue message on interface, and start output if interface 570 * not yet active. 571 */ 572 s = splimp(); 573 if (IF_QFULL(&ifp->if_snd)) { 574 IF_DROP(&ifp->if_snd); 575 error = ENOBUFS; 576 goto qfull; 577 } 578 IF_ENQUEUE(&ifp->if_snd, m); 579 if (en_softc[ifp->if_unit].es_oactive == 0) 580 enstart(ifp->if_unit); 581 splx(s); 582 return (0); 583 qfull: 584 m0 = m; 585 splx(s); 586 bad: 587 m_freem(m0); 588 return (error); 589 } 590 591 /* 592 * Process an ioctl request. 593 */ 594 enioctl(ifp, cmd, data) 595 register struct ifnet *ifp; 596 int cmd; 597 caddr_t data; 598 { 599 struct ifreq *ifr = (struct ifreq *)data; 600 int s = splimp(), error = 0; 601 602 switch (cmd) { 603 604 case SIOCSIFADDR: 605 if (ifp->if_flags & IFF_RUNNING) 606 if_rtinit(ifp, -1); /* delete previous route */ 607 ensetaddr(ifp, (struct sockaddr_in *)&ifr->ifr_addr); 608 if (ifp->if_flags & IFF_RUNNING) 609 if_rtinit(ifp, RTF_UP); 610 else 611 eninit(ifp->if_unit); 612 break; 613 614 default: 615 error = EINVAL; 616 } 617 splx(s); 618 return (error); 619 } 620 621 ensetaddr(ifp, sin) 622 register struct ifnet *ifp; 623 register struct sockaddr_in *sin; 624 { 625 struct endevice *enaddr; 626 627 ifp->if_net = in_netof(sin->sin_addr); 628 enaddr = (struct endevice *)eninfo[ifp->if_unit]->ui_addr; 629 ifp->if_host[0] = (~enaddr->en_addr) & 0xff; 630 sin = (struct sockaddr_in *)&ifp->if_addr; 631 sin->sin_family = AF_INET; 632 sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); 633 sin = (struct sockaddr_in *)&ifp->if_broadaddr; 634 sin->sin_family = AF_INET; 635 sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); 636 ifp->if_flags |= IFF_BROADCAST; 637 } 638 639 #ifdef ENF_SWABIPS 640 /* 641 * Swab bytes 642 * Jeffrey Mogul, Stanford 643 */ 644 enswab(from, to, n) 645 register caddr_t *from, *to; 646 register int n; 647 { 648 register unsigned long temp; 649 650 n >>= 1; n++; 651 #define STEP temp = *from++,*to++ = *from++,*to++ = temp 652 /* round to multiple of 8 */ 653 while ((--n) & 07) 654 STEP; 655 n >>= 3; 656 while (--n >= 0) { 657 STEP; STEP; STEP; STEP; 658 STEP; STEP; STEP; STEP; 659 } 660 } 661 #endif 662