1 /* if_en.c 4.73 82/11/17 */ 2 3 #include "en.h" 4 5 /* 6 * Xerox prototype (3 Mb) Ethernet interface driver. 7 */ 8 9 #include "../h/param.h" 10 #include "../h/systm.h" 11 #include "../h/mbuf.h" 12 #include "../h/pte.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_en.h" 31 #include "../vaxif/if_enreg.h" 32 #include "../vaxif/if_uba.h" 33 #include "../vaxuba/ubareg.h" 34 #include "../vaxuba/ubavar.h" 35 36 #define ENMTU (1024+512) 37 #define ENMRU (1024+512+16) /* 16 is enough to receive trailer */ 38 39 int enprobe(), enattach(), enrint(), enxint(), encollide(); 40 struct uba_device *eninfo[NEN]; 41 u_short enstd[] = { 0 }; 42 struct uba_driver endriver = 43 { enprobe, 0, enattach, 0, enstd, "en", eninfo }; 44 #define ENUNIT(x) minor(x) 45 46 int eninit(),enoutput(),enreset(); 47 48 /* 49 * Ethernet software status per interface. 50 * 51 * Each interface is referenced by a network interface structure, 52 * es_if, which the routing code uses to locate the interface. 53 * This structure contains the output queue for the interface, its address, ... 54 * We also have, for each interface, a UBA interface structure, which 55 * contains information about the UNIBUS resources held by the interface: 56 * map registers, buffered data paths, etc. Information is cached in this 57 * structure for use by the if_uba.c routines in running the interface 58 * efficiently. 59 */ 60 struct en_softc { 61 struct ifnet es_if; /* network-visible interface */ 62 struct ifuba es_ifuba; /* UNIBUS resources */ 63 short es_delay; /* current output delay */ 64 short es_mask; /* mask for current output delay */ 65 short es_lastx; /* host last transmitted to */ 66 short es_oactive; /* is output active? */ 67 short es_olen; /* length of last output */ 68 } en_softc[NEN]; 69 70 /* 71 * Do output DMA to determine interface presence and 72 * interrupt vector. DMA is too short to disturb other hosts. 73 */ 74 enprobe(reg) 75 caddr_t reg; 76 { 77 register int br, cvec; /* r11, r10 value-result */ 78 register struct endevice *addr = (struct endevice *)reg; 79 80 #ifdef lint 81 br = 0; cvec = br; br = cvec; 82 enrint(0); enxint(0); encollide(0); 83 #endif 84 addr->en_istat = 0; 85 addr->en_owc = -1; 86 addr->en_oba = 0; 87 addr->en_ostat = EN_IEN|EN_GO; 88 DELAY(100000); 89 addr->en_ostat = 0; 90 #ifdef ECHACK 91 br = 0x16; 92 #endif 93 return (1); 94 } 95 96 /* 97 * Interface exists: make available by filling in network interface 98 * record. System will initialize the interface when it is ready 99 * to accept packets. 100 */ 101 enattach(ui) 102 struct uba_device *ui; 103 { 104 register struct en_softc *es = &en_softc[ui->ui_unit]; 105 register struct sockaddr_in *sin; 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_net = ui->ui_flags; 111 es->es_if.if_host[0] = 112 (~(((struct endevice *)eninfo[ui->ui_unit]->ui_addr)->en_addr)) & 0xff; 113 sin = (struct sockaddr_in *)&es->es_if.if_addr; 114 sin->sin_family = AF_INET; 115 sin->sin_addr = if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); 116 sin = (struct sockaddr_in *)&es->es_if.if_broadaddr; 117 sin->sin_family = AF_INET; 118 sin->sin_addr = if_makeaddr(es->es_if.if_net, 0); 119 es->es_if.if_flags = IFF_BROADCAST; 120 es->es_if.if_init = eninit; 121 es->es_if.if_output = enoutput; 122 es->es_if.if_reset = enreset; 123 es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16 | UBA_CANTWAIT; 124 #if defined(VAX750) 125 /* don't chew up 750 bdp's */ 126 if (cpu == VAX_750 && ui->ui_unit > 0) 127 es->es_ifuba.ifu_flags &= ~UBA_NEEDBDP; 128 #endif 129 if_attach(&es->es_if); 130 } 131 132 /* 133 * Reset of interface after UNIBUS reset. 134 * If interface is on specified uba, reset its state. 135 */ 136 enreset(unit, uban) 137 int unit, uban; 138 { 139 register struct uba_device *ui; 140 141 if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || 142 ui->ui_ubanum != uban) 143 return; 144 printf(" en%d", unit); 145 eninit(unit); 146 } 147 148 /* 149 * Initialization of interface; clear recorded pending 150 * operations, and reinitialize UNIBUS usage. 151 */ 152 eninit(unit) 153 int unit; 154 { 155 register struct en_softc *es = &en_softc[unit]; 156 register struct uba_device *ui = eninfo[unit]; 157 register struct endevice *addr; 158 int s; 159 160 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; 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); 221 222 /* 223 * Ethernet cannot take back-to-back packets (no 224 * buffering in interface. To help avoid overrunning 225 * receivers, enforce a small delay (about 1ms) in interface: 226 * * between all packets when enalldelay 227 * * whenever last packet was broadcast 228 * * whenever this packet is to same host as last packet 229 */ 230 if (enalldelay || es->es_lastx == 0 || es->es_lastx == dest) { 231 es->es_delay = enlastdel; 232 es->es_mask = enlastmask; 233 } 234 es->es_lastx = dest; 235 236 restart: 237 /* 238 * Have request mapped to UNIBUS for transmission. 239 * Purge any stale data from this BDP, and start the otput. 240 */ 241 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 242 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); 243 addr = (struct endevice *)ui->ui_addr; 244 addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; 245 addr->en_odelay = es->es_delay; 246 addr->en_owc = -((es->es_olen + 1) >> 1); 247 addr->en_ostat = EN_IEN|EN_GO; 248 es->es_oactive = 1; 249 } 250 251 /* 252 * Ethernet interface transmitter interrupt. 253 * Start another output if more data to send. 254 */ 255 enxint(unit) 256 int unit; 257 { 258 register struct uba_device *ui = eninfo[unit]; 259 register struct en_softc *es = &en_softc[unit]; 260 register struct endevice *addr = (struct endevice *)ui->ui_addr; 261 262 if (es->es_oactive == 0) 263 return; 264 if (es->es_mask && (addr->en_ostat&EN_OERROR)) { 265 es->es_if.if_oerrors++; 266 endocoll(unit); 267 return; 268 } 269 es->es_if.if_opackets++; 270 es->es_oactive = 0; 271 es->es_delay = 0; 272 es->es_mask = ~0; 273 if (es->es_ifuba.ifu_xtofree) { 274 m_freem(es->es_ifuba.ifu_xtofree); 275 es->es_ifuba.ifu_xtofree = 0; 276 } 277 if (es->es_if.if_snd.ifq_head == 0) { 278 es->es_lastx = 256; /* putatively illegal */ 279 return; 280 } 281 enstart(unit); 282 } 283 284 /* 285 * Collision on ethernet interface. Do exponential 286 * backoff, and retransmit. If have backed off all 287 * the way print warning diagnostic, and drop packet. 288 */ 289 encollide(unit) 290 int unit; 291 { 292 struct en_softc *es = &en_softc[unit]; 293 294 es->es_if.if_collisions++; 295 if (es->es_oactive == 0) 296 return; 297 endocoll(unit); 298 } 299 300 endocoll(unit) 301 int unit; 302 { 303 register struct en_softc *es = &en_softc[unit]; 304 305 /* 306 * Es_mask is a 16 bit number with n low zero bits, with 307 * n the number of backoffs. When es_mask is 0 we have 308 * backed off 16 times, and give up. 309 */ 310 if (es->es_mask == 0) { 311 printf("en%d: send error\n", unit); 312 enxint(unit); 313 return; 314 } 315 /* 316 * Another backoff. Restart with delay based on n low bits 317 * of the interval timer. 318 */ 319 es->es_mask <<= 1; 320 es->es_delay = mfpr(ICR) &~ es->es_mask; 321 enstart(unit); 322 } 323 324 struct sockaddr_pup pupsrc = { AF_PUP }; 325 struct sockaddr_pup pupdst = { AF_PUP }; 326 struct sockproto pupproto = { PF_PUP }; 327 /* 328 * Ethernet interface receiver interrupt. 329 * If input error just drop packet. 330 * Otherwise purge input buffered data path and examine 331 * packet to determine type. If can't determine length 332 * from type, then have to drop packet. Othewise decapsulate 333 * packet based on type and pass to type specific higher-level 334 * input routine. 335 */ 336 enrint(unit) 337 int unit; 338 { 339 register struct en_softc *es = &en_softc[unit]; 340 struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; 341 register struct en_header *en; 342 struct mbuf *m; 343 int len; short resid; 344 register struct ifqueue *inq; 345 int off; 346 347 es->es_if.if_ipackets++; 348 349 /* 350 * Purge BDP; drop if input error indicated. 351 */ 352 if (es->es_ifuba.ifu_flags & UBA_NEEDBDP) 353 UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); 354 if (addr->en_istat&EN_IERROR) { 355 es->es_if.if_ierrors++; 356 goto setup; 357 } 358 359 /* 360 * Calculate input data length. 361 * Get pointer to ethernet header (in input buffer). 362 * Deal with trailer protocol: if type is PUP trailer 363 * get true type from first 16-bit word past data. 364 * Remember that type was trailer by setting off. 365 */ 366 resid = addr->en_iwc; 367 if (resid) 368 resid |= 0176000; 369 len = (((sizeof (struct en_header) + ENMRU) >> 1) + resid) << 1; 370 len -= sizeof (struct en_header); 371 if (len > ENMRU) 372 goto setup; /* sanity */ 373 en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); 374 #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) 375 if (en->en_type >= ENPUP_TRAIL && 376 en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { 377 off = (en->en_type - ENPUP_TRAIL) * 512; 378 if (off > ENMTU) 379 goto setup; /* sanity */ 380 en->en_type = *endataaddr(en, off, u_short *); 381 resid = *(endataaddr(en, off+2, u_short *)); 382 if (off + resid > len) 383 goto setup; /* sanity */ 384 len = off + resid; 385 } else 386 off = 0; 387 if (len == 0) 388 goto setup; 389 /* 390 * Pull packet off interface. Off is nonzero if packet 391 * has trailing header; if_rubaget will then force this header 392 * information to be at the front, but we still have to drop 393 * the type and length which are at the front of any trailer data. 394 */ 395 m = if_rubaget(&es->es_ifuba, len, off); 396 if (m == 0) 397 goto setup; 398 if (off) { 399 m->m_off += 2 * sizeof (u_short); 400 m->m_len -= 2 * sizeof (u_short); 401 } 402 switch (en->en_type) { 403 404 #ifdef INET 405 case ENPUP_IPTYPE: 406 schednetisr(NETISR_IP); 407 inq = &ipintrq; 408 break; 409 #endif 410 #ifdef PUP 411 case ENPUP_PUPTYPE: { 412 struct pup_header *pup = mtod(m, struct pup_header *); 413 414 pupproto.sp_protocol = pup->pup_type; 415 pupdst.spup_addr = pup->pup_dport; 416 pupsrc.spup_addr = pup->pup_sport; 417 raw_input(m, &pupproto, (struct sockaddr *)&pupsrc, 418 (struct sockaddr *)&pupdst); 419 goto setup; 420 } 421 #endif 422 default: 423 m_freem(m); 424 goto setup; 425 } 426 427 if (IF_QFULL(inq)) { 428 IF_DROP(inq); 429 m_freem(m); 430 } else 431 IF_ENQUEUE(inq, m); 432 433 setup: 434 /* 435 * Reset for next packet. 436 */ 437 addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; 438 addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1; 439 addr->en_istat = EN_IEN|EN_GO; 440 } 441 442 /* 443 * Ethernet output routine. 444 * Encapsulate a packet of type family for the local net. 445 * Use trailer local net encapsulation if enough data in first 446 * packet leaves a multiple of 512 bytes of data in remainder. 447 */ 448 enoutput(ifp, m0, dst) 449 struct ifnet *ifp; 450 struct mbuf *m0; 451 struct sockaddr *dst; 452 { 453 int type, dest, s, error; 454 register struct mbuf *m = m0; 455 register struct en_header *en; 456 register int off; 457 458 switch (dst->sa_family) { 459 460 #ifdef INET 461 case AF_INET: 462 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 463 if (in_lnaof(*((struct in_addr *)&dest)) >= 0x100) { 464 error = EPERM; /* ??? */ 465 goto bad; 466 } 467 dest = (dest >> 24) & 0xff; 468 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 469 if (off > 0 && (off & 0x1ff) == 0 && 470 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 471 type = ENPUP_TRAIL + (off>>9); 472 m->m_off -= 2 * sizeof (u_short); 473 m->m_len += 2 * sizeof (u_short); 474 *mtod(m, u_short *) = ENPUP_IPTYPE; 475 *(mtod(m, u_short *) + 1) = m->m_len; 476 goto gottrailertype; 477 } 478 type = ENPUP_IPTYPE; 479 off = 0; 480 goto gottype; 481 #endif 482 #ifdef PUP 483 case AF_PUP: 484 dest = ((struct sockaddr_pup *)dst)->spup_addr.pp_host; 485 type = ENPUP_PUPTYPE; 486 off = 0; 487 goto gottype; 488 #endif 489 490 default: 491 printf("en%d: can't handle af%d\n", ifp->if_unit, 492 dst->sa_family); 493 error = EAFNOSUPPORT; 494 goto bad; 495 } 496 497 gottrailertype: 498 /* 499 * Packet to be sent as trailer: move first packet 500 * (control information) to end of chain. 501 */ 502 while (m->m_next) 503 m = m->m_next; 504 m->m_next = m0; 505 m = m0->m_next; 506 m0->m_next = 0; 507 m0 = m; 508 509 gottype: 510 /* 511 * Add local net header. If no space in first mbuf, 512 * allocate another. 513 */ 514 if (m->m_off > MMAXOFF || 515 MMINOFF + sizeof (struct en_header) > m->m_off) { 516 m = m_get(M_DONTWAIT); 517 if (m == 0) { 518 error = ENOBUFS; 519 goto bad; 520 } 521 m->m_next = m0; 522 m->m_off = MMINOFF; 523 m->m_len = sizeof (struct en_header); 524 } else { 525 m->m_off -= sizeof (struct en_header); 526 m->m_len += sizeof (struct en_header); 527 } 528 en = mtod(m, struct en_header *); 529 en->en_shost = ifp->if_host[0]; 530 en->en_dhost = dest; 531 en->en_type = type; 532 533 /* 534 * Queue message on interface, and start output if interface 535 * not yet active. 536 */ 537 s = splimp(); 538 if (IF_QFULL(&ifp->if_snd)) { 539 IF_DROP(&ifp->if_snd); 540 error = ENOBUFS; 541 goto qfull; 542 } 543 IF_ENQUEUE(&ifp->if_snd, m); 544 if (en_softc[ifp->if_unit].es_oactive == 0) 545 enstart(ifp->if_unit); 546 splx(s); 547 return (0); 548 qfull: 549 m0 = m; 550 splx(s); 551 bad: 552 m_freem(m0); 553 return (error); 554 } 555