1 /* if_en.c 4.79 83/06/12 */ 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 29 #include "../vax/cpu.h" 30 #include "../vax/mtpr.h" 31 #include "../vaxif/if_en.h" 32 #include "../vaxif/if_enreg.h" 33 #include "../vaxif/if_uba.h" 34 #include "../vaxuba/ubareg.h" 35 #include "../vaxuba/ubavar.h" 36 37 #define ENMTU (1024+512) 38 #define ENMRU (1024+512+16) /* 16 is enough to receive trailer */ 39 40 int enprobe(), enattach(), enrint(), enxint(), encollide(); 41 struct uba_device *eninfo[NEN]; 42 u_short enstd[] = { 0 }; 43 struct uba_driver endriver = 44 { enprobe, 0, enattach, 0, enstd, "en", eninfo }; 45 #define ENUNIT(x) minor(x) 46 47 int eninit(),enoutput(),enreset(),enioctl(); 48 49 /* 50 * Ethernet software status per interface. 51 * 52 * Each interface is referenced by a network interface structure, 53 * es_if, which the routing code uses to locate the interface. 54 * This structure contains the output queue for the interface, its address, ... 55 * We also have, for each interface, a UBA interface structure, which 56 * contains information about the UNIBUS resources held by the interface: 57 * map registers, buffered data paths, etc. Information is cached in this 58 * structure for use by the if_uba.c routines in running the interface 59 * efficiently. 60 */ 61 struct en_softc { 62 struct ifnet es_if; /* network-visible interface */ 63 struct ifuba es_ifuba; /* UNIBUS resources */ 64 short es_delay; /* current output delay */ 65 short es_mask; /* mask for current output delay */ 66 short es_lastx; /* host last transmitted to */ 67 short es_oactive; /* is output active? */ 68 short es_olen; /* length of last output */ 69 } en_softc[NEN]; 70 71 /* 72 * Do output DMA to determine interface presence and 73 * interrupt vector. DMA is too short to disturb other hosts. 74 */ 75 enprobe(reg) 76 caddr_t reg; 77 { 78 register int br, cvec; /* r11, r10 value-result */ 79 register struct endevice *addr = (struct endevice *)reg; 80 81 #ifdef lint 82 br = 0; cvec = br; br = cvec; 83 enrint(0); enxint(0); encollide(0); 84 #endif 85 addr->en_istat = 0; 86 addr->en_owc = -1; 87 addr->en_oba = 0; 88 addr->en_ostat = EN_IEN|EN_GO; 89 DELAY(100000); 90 addr->en_ostat = 0; 91 #ifdef ECHACK 92 br = 0x16; 93 #endif 94 return (1); 95 } 96 97 /* 98 * Interface exists: make available by filling in network interface 99 * record. System will initialize the interface when it is ready 100 * to accept packets. 101 */ 102 enattach(ui) 103 struct uba_device *ui; 104 { 105 register struct en_softc *es = &en_softc[ui->ui_unit]; 106 107 es->es_if.if_unit = ui->ui_unit; 108 es->es_if.if_name = "en"; 109 es->es_if.if_mtu = ENMTU; 110 es->es_if.if_init = eninit; 111 es->es_if.if_output = enoutput; 112 es->es_if.if_ioctl = enioctl; 113 es->es_if.if_reset = enreset; 114 es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16 | UBA_CANTWAIT; 115 #if defined(VAX750) 116 /* don't chew up 750 bdp's */ 117 if (cpu == VAX_750 && ui->ui_unit > 0) 118 es->es_ifuba.ifu_flags &= ~UBA_NEEDBDP; 119 #endif 120 if_attach(&es->es_if); 121 } 122 123 /* 124 * Reset of interface after UNIBUS reset. 125 * If interface is on specified uba, reset its state. 126 */ 127 enreset(unit, uban) 128 int unit, uban; 129 { 130 register struct uba_device *ui; 131 132 if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || 133 ui->ui_ubanum != uban) 134 return; 135 printf(" en%d", unit); 136 eninit(unit); 137 } 138 139 /* 140 * Initialization of interface; clear recorded pending 141 * operations, and reinitialize UNIBUS usage. 142 */ 143 eninit(unit) 144 int unit; 145 { 146 register struct en_softc *es = &en_softc[unit]; 147 register struct uba_device *ui = eninfo[unit]; 148 register struct endevice *addr; 149 struct sockaddr_in *sin = (struct sockaddr_in *)&es->es_if.if_addr; 150 int s; 151 152 if (in_netof(sin->sin_addr) == 0) 153 return; 154 if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, 155 sizeof (struct en_header), (int)btoc(ENMRU)) == 0) { 156 printf("en%d: can't initialize\n", unit); 157 es->es_if.if_flags &= ~IFF_UP; 158 return; 159 } 160 addr = (struct endevice *)ui->ui_addr; 161 addr->en_istat = addr->en_ostat = 0; 162 163 /* 164 * Hang a receive and start any 165 * pending writes by faking a transmit complete. 166 */ 167 s = splimp(); 168 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 169 addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1; 170 addr->en_istat = EN_IEN|EN_GO; 171 es->es_oactive = 1; 172 es->es_if.if_flags |= IFF_UP|IFF_RUNNING; 173 enxint(unit); 174 splx(s); 175 if_rtinit(&es->es_if, RTF_UP); 176 } 177 178 int enalldelay = 0; 179 int enlastdel = 50; 180 int enlastmask = (~0) << 5; 181 182 /* 183 * Start or restart output on interface. 184 * If interface is already active, then this is a retransmit 185 * after a collision, and just restuff registers and delay. 186 * If interface is not already active, get another datagram 187 * to send off of the interface queue, and map it to the interface 188 * before starting the output. 189 */ 190 enstart(dev) 191 dev_t dev; 192 { 193 int unit = ENUNIT(dev); 194 struct uba_device *ui = eninfo[unit]; 195 register struct en_softc *es = &en_softc[unit]; 196 register struct endevice *addr; 197 struct mbuf *m; 198 int dest; 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 help avoid overrunning 219 * receivers, enforce a small delay (about 1ms) in interface: 220 * * between all packets when enalldelay 221 * * whenever last packet was broadcast 222 * * whenever this packet is to same host as last packet 223 */ 224 if (enalldelay || es->es_lastx == 0 || es->es_lastx == dest) { 225 es->es_delay = enlastdel; 226 es->es_mask = enlastmask; 227 } 228 es->es_lastx = dest; 229 230 restart: 231 /* 232 * Have request mapped to UNIBUS for transmission. 233 * Purge any stale data from this BDP, and start the otput. 234 */ 235 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 236 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); 237 addr = (struct endevice *)ui->ui_addr; 238 addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; 239 addr->en_odelay = es->es_delay; 240 addr->en_owc = -((es->es_olen + 1) >> 1); 241 addr->en_ostat = EN_IEN|EN_GO; 242 es->es_oactive = 1; 243 } 244 245 /* 246 * Ethernet interface transmitter interrupt. 247 * Start another output if more data to send. 248 */ 249 enxint(unit) 250 int unit; 251 { 252 register struct uba_device *ui = eninfo[unit]; 253 register struct en_softc *es = &en_softc[unit]; 254 register struct endevice *addr = (struct endevice *)ui->ui_addr; 255 256 if (es->es_oactive == 0) 257 return; 258 if (es->es_mask && (addr->en_ostat&EN_OERROR)) { 259 es->es_if.if_oerrors++; 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 = 256; /* putatively illegal */ 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]; 287 288 es->es_if.if_collisions++; 289 if (es->es_oactive == 0) 290 return; 291 endocoll(unit); 292 } 293 294 endocoll(unit) 295 int unit; 296 { 297 register struct en_softc *es = &en_softc[unit]; 298 299 /* 300 * Es_mask is a 16 bit number with n low zero bits, with 301 * n the number of backoffs. When es_mask is 0 we have 302 * backed off 16 times, and give up. 303 */ 304 if (es->es_mask == 0) { 305 printf("en%d: send error\n", unit); 306 enxint(unit); 307 return; 308 } 309 /* 310 * Another backoff. Restart with delay based on n low bits 311 * of the interval timer. 312 */ 313 es->es_mask <<= 1; 314 es->es_delay = mfpr(ICR) &~ es->es_mask; 315 enstart(unit); 316 } 317 318 struct sockaddr_pup pupsrc = { AF_PUP }; 319 struct sockaddr_pup pupdst = { AF_PUP }; 320 struct sockproto pupproto = { PF_PUP }; 321 /* 322 * Ethernet interface receiver interrupt. 323 * If input error just drop packet. 324 * Otherwise purge input buffered data path and examine 325 * packet to determine type. If can't determine length 326 * from type, then have to drop packet. Othewise decapsulate 327 * packet based on type and pass to type specific higher-level 328 * input routine. 329 */ 330 enrint(unit) 331 int unit; 332 { 333 register struct en_softc *es = &en_softc[unit]; 334 struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; 335 register struct en_header *en; 336 struct mbuf *m; 337 int len; short resid; 338 register struct ifqueue *inq; 339 int off; 340 341 es->es_if.if_ipackets++; 342 343 /* 344 * Purge BDP; drop if input error indicated. 345 */ 346 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 347 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); 348 if (addr->en_istat&EN_IERROR) { 349 es->es_if.if_ierrors++; 350 goto setup; 351 } 352 353 /* 354 * Calculate input data length. 355 * Get pointer to ethernet header (in input buffer). 356 * Deal with trailer protocol: if type is PUP trailer 357 * get true type from first 16-bit word past data. 358 * Remember that type was trailer by setting off. 359 */ 360 resid = addr->en_iwc; 361 if (resid) 362 resid |= 0176000; 363 len = (((sizeof (struct en_header) + ENMRU) >> 1) + resid) << 1; 364 len -= sizeof (struct en_header); 365 if (len > ENMRU) 366 goto setup; /* sanity */ 367 en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); 368 en->en_type = ntohs(en->en_type); 369 #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) 370 if (en->en_type >= ENTYPE_TRAIL && 371 en->en_type < ENTYPE_TRAIL+ENTYPE_NTRAILER) { 372 off = (en->en_type - ENTYPE_TRAIL) * 512; 373 if (off > ENMTU) 374 goto setup; /* sanity */ 375 en->en_type = ntohs(*endataaddr(en, off, u_short *)); 376 resid = ntohs(*(endataaddr(en, off+2, u_short *))); 377 if (off + resid > len) 378 goto setup; /* sanity */ 379 len = off + resid; 380 } else 381 off = 0; 382 if (len == 0) 383 goto setup; 384 /* 385 * Pull packet off interface. Off is nonzero if packet 386 * has trailing header; if_rubaget will then force this header 387 * information to be at the front, but we still have to drop 388 * the type and length which are at the front of any trailer data. 389 */ 390 m = if_rubaget(&es->es_ifuba, len, off); 391 if (m == 0) 392 goto setup; 393 if (off) { 394 m->m_off += 2 * sizeof (u_short); 395 m->m_len -= 2 * sizeof (u_short); 396 } 397 switch (en->en_type) { 398 399 #ifdef INET 400 case ENTYPE_IP: 401 schednetisr(NETISR_IP); 402 inq = &ipintrq; 403 break; 404 #endif 405 #ifdef PUP 406 case ENTYPE_PUP: { 407 struct pup_header *pup = mtod(m, struct pup_header *); 408 409 pupproto.sp_protocol = pup->pup_type; 410 bcopy((caddr_t)pup->pup_dnet, (caddr_t)pupdst.spup_net, 411 sizeof (struct pupport)); 412 bcopy((caddr_t)pup->pup_snet, (caddr_t)pupsrc.spup_net, 413 sizeof (struct pupport)); 414 raw_input(m, &pupproto, (struct sockaddr *)&pupsrc, 415 (struct sockaddr *)&pupdst); 416 goto setup; 417 } 418 #endif 419 default: 420 m_freem(m); 421 goto setup; 422 } 423 424 if (IF_QFULL(inq)) { 425 IF_DROP(inq); 426 m_freem(m); 427 } else 428 IF_ENQUEUE(inq, m); 429 430 setup: 431 /* 432 * Reset for next packet. 433 */ 434 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 435 addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1; 436 addr->en_istat = EN_IEN|EN_GO; 437 } 438 439 /* 440 * Ethernet output routine. 441 * Encapsulate a packet of type family for the local net. 442 * Use trailer local net encapsulation if enough data in first 443 * packet leaves a multiple of 512 bytes of data in remainder. 444 */ 445 enoutput(ifp, m0, dst) 446 struct ifnet *ifp; 447 struct mbuf *m0; 448 struct sockaddr *dst; 449 { 450 int type, dest, s, error; 451 register struct mbuf *m = m0; 452 register struct en_header *en; 453 register int off; 454 455 switch (dst->sa_family) { 456 457 #ifdef INET 458 case AF_INET: 459 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 460 if (in_lnaof(*((struct in_addr *)&dest)) >= 0x100) { 461 error = EPERM; /* ??? */ 462 goto bad; 463 } 464 dest = (dest >> 24) & 0xff; 465 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 466 /* need per host negotiation */ 467 if ((ifp->if_flags & IFF_NOTRAILERS) == 0) 468 if (off > 0 && (off & 0x1ff) == 0 && 469 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 470 type = ENTYPE_TRAIL + (off>>9); 471 m->m_off -= 2 * sizeof (u_short); 472 m->m_len += 2 * sizeof (u_short); 473 *mtod(m, u_short *) = htons((u_short)ENTYPE_IP); 474 *(mtod(m, u_short *) + 1) = ntohs((u_short)m->m_len); 475 goto gottrailertype; 476 } 477 type = ENTYPE_IP; 478 off = 0; 479 goto gottype; 480 #endif 481 #ifdef PUP 482 case AF_PUP: 483 dest = ((struct sockaddr_pup *)dst)->spup_host; 484 type = ENTYPE_PUP; 485 off = 0; 486 goto gottype; 487 #endif 488 489 default: 490 printf("en%d: can't handle af%d\n", ifp->if_unit, 491 dst->sa_family); 492 error = EAFNOSUPPORT; 493 goto bad; 494 } 495 496 gottrailertype: 497 /* 498 * Packet to be sent as trailer: move first packet 499 * (control information) to end of chain. 500 */ 501 while (m->m_next) 502 m = m->m_next; 503 m->m_next = m0; 504 m = m0->m_next; 505 m0->m_next = 0; 506 m0 = m; 507 508 gottype: 509 /* 510 * Add local net header. If no space in first mbuf, 511 * allocate another. 512 */ 513 if (m->m_off > MMAXOFF || 514 MMINOFF + sizeof (struct en_header) > m->m_off) { 515 m = m_get(M_DONTWAIT, MT_HEADER); 516 if (m == 0) { 517 error = ENOBUFS; 518 goto bad; 519 } 520 m->m_next = m0; 521 m->m_off = MMINOFF; 522 m->m_len = sizeof (struct en_header); 523 } else { 524 m->m_off -= sizeof (struct en_header); 525 m->m_len += sizeof (struct en_header); 526 } 527 en = mtod(m, struct en_header *); 528 en->en_shost = ifp->if_host[0]; 529 en->en_dhost = dest; 530 en->en_type = htons((u_short)type); 531 532 /* 533 * Queue message on interface, and start output if interface 534 * not yet active. 535 */ 536 s = splimp(); 537 if (IF_QFULL(&ifp->if_snd)) { 538 IF_DROP(&ifp->if_snd); 539 error = ENOBUFS; 540 goto qfull; 541 } 542 IF_ENQUEUE(&ifp->if_snd, m); 543 if (en_softc[ifp->if_unit].es_oactive == 0) 544 enstart(ifp->if_unit); 545 splx(s); 546 return (0); 547 qfull: 548 m0 = m; 549 splx(s); 550 bad: 551 m_freem(m0); 552 return (error); 553 } 554 555 /* 556 * Process an ioctl request. 557 */ 558 enioctl(ifp, cmd, data) 559 register struct ifnet *ifp; 560 int cmd; 561 caddr_t data; 562 { 563 struct ifreq *ifr = (struct ifreq *)data; 564 int s = splimp(), error = 0; 565 566 switch (cmd) { 567 568 case SIOCSIFADDR: 569 if (ifp->if_flags & IFF_RUNNING) 570 if_rtinit(ifp, -1); /* delete previous route */ 571 ensetaddr(ifp, (struct sockaddr_in *)&ifr->ifr_addr); 572 if (ifp->if_flags & IFF_RUNNING) 573 if_rtinit(ifp, RTF_UP); 574 else 575 eninit(ifp->if_unit); 576 break; 577 578 default: 579 error = EINVAL; 580 } 581 splx(s); 582 return (error); 583 } 584 585 ensetaddr(ifp, sin) 586 register struct ifnet *ifp; 587 register struct sockaddr_in *sin; 588 { 589 struct endevice *enaddr; 590 591 ifp->if_net = in_netof(sin->sin_addr); 592 enaddr = (struct endevice *)eninfo[ifp->if_unit]->ui_addr; 593 ifp->if_host[0] = (~enaddr->en_addr) & 0xff; 594 sin = (struct sockaddr_in *)&ifp->if_addr; 595 sin->sin_family = AF_INET; 596 sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); 597 sin = (struct sockaddr_in *)&ifp->if_broadaddr; 598 sin->sin_family = AF_INET; 599 sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); 600 ifp->if_flags |= IFF_BROADCAST; 601 } 602