| 1 | /* if_en.c 4.43 82/03/19 */ |
| 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/ubareg.h" |
| 17 | #include "../h/ubavar.h" |
| 18 | #include "../h/enreg.h" |
| 19 | #include "../h/cpu.h" |
| 20 | #include "../h/mtpr.h" |
| 21 | #include "../h/vmmac.h" |
| 22 | #include "../net/in.h" |
| 23 | #include "../net/in_systm.h" |
| 24 | #include "../net/if.h" |
| 25 | #include "../net/if_en.h" |
| 26 | #include "../net/if_uba.h" |
| 27 | #include "../net/ip.h" |
| 28 | #include "../net/ip_var.h" |
| 29 | #include "../net/pup.h" |
| 30 | |
| 31 | #define ENMTU (1024+512) |
| 32 | |
| 33 | int enprobe(), enattach(), enrint(), enxint(), encollide(); |
| 34 | struct uba_device *eninfo[NEN]; |
| 35 | u_short enstd[] = { 0 }; |
| 36 | struct uba_driver endriver = |
| 37 | { enprobe, 0, enattach, 0, enstd, "en", eninfo }; |
| 38 | #define ENUNIT(x) minor(x) |
| 39 | |
| 40 | int eninit(),enoutput(),enreset(); |
| 41 | |
| 42 | /* |
| 43 | * Ethernet software status per interface. |
| 44 | * |
| 45 | * Each interface is referenced by a network interface structure, |
| 46 | * es_if, which the routing code uses to locate the interface. |
| 47 | * This structure contains the output queue for the interface, its address, ... |
| 48 | * We also have, for each interface, a UBA interface structure, which |
| 49 | * contains information about the UNIBUS resources held by the interface: |
| 50 | * map registers, buffered data paths, etc. Information is cached in this |
| 51 | * structure for use by the if_uba.c routines in running the interface |
| 52 | * efficiently. |
| 53 | */ |
| 54 | struct en_softc { |
| 55 | struct ifnet es_if; /* network-visible interface */ |
| 56 | struct ifuba es_ifuba; /* UNIBUS resources */ |
| 57 | short es_delay; /* current output delay */ |
| 58 | short es_mask; /* mask for current output delay */ |
| 59 | u_char es_lastx; /* host last transmitted to */ |
| 60 | short es_oactive; /* is output active? */ |
| 61 | short es_olen; /* length of last output */ |
| 62 | } en_softc[NEN]; |
| 63 | |
| 64 | /* |
| 65 | * Do output DMA to determine interface presence and |
| 66 | * interrupt vector. DMA is too short to disturb other hosts. |
| 67 | */ |
| 68 | enprobe(reg) |
| 69 | caddr_t reg; |
| 70 | { |
| 71 | register int br, cvec; /* r11, r10 value-result */ |
| 72 | register struct endevice *addr = (struct endevice *)reg; |
| 73 | |
| 74 | COUNT(ENPROBE); |
| 75 | #ifdef lint |
| 76 | br = 0; cvec = br; br = cvec; |
| 77 | enrint(0); enxint(0); encollide(0); |
| 78 | #endif |
| 79 | addr->en_istat = 0; |
| 80 | addr->en_owc = -1; |
| 81 | addr->en_oba = 0; |
| 82 | addr->en_ostat = EN_IEN|EN_GO; |
| 83 | DELAY(100000); |
| 84 | addr->en_ostat = 0; |
| 85 | return (1); |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Interface exists: make available by filling in network interface |
| 90 | * record. System will initialize the interface when it is ready |
| 91 | * to accept packets. |
| 92 | */ |
| 93 | enattach(ui) |
| 94 | struct uba_device *ui; |
| 95 | { |
| 96 | register struct en_softc *es = &en_softc[ui->ui_unit]; |
| 97 | COUNT(ENATTACH); |
| 98 | |
| 99 | es->es_if.if_unit = ui->ui_unit; |
| 100 | es->es_if.if_name = "en"; |
| 101 | es->es_if.if_mtu = ENMTU; |
| 102 | es->es_if.if_net = ui->ui_flags; |
| 103 | es->es_if.if_host[0] = |
| 104 | (~(((struct endevice *)eninfo[ui->ui_unit]->ui_addr)->en_addr)) & 0xff; |
| 105 | #ifdef ENKLUDGE |
| 106 | if (es->es_if.if_net == 10) { |
| 107 | es->es_if.if_host[0] <<= 16; |
| 108 | es->es_if.if_host[0] |= 0x4e; |
| 109 | } |
| 110 | #endif |
| 111 | es->es_if.if_addr = |
| 112 | if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); |
| 113 | es->es_if.if_broadaddr = |
| 114 | if_makeaddr(es->es_if.if_net, 0); |
| 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 | } |
| 121 | |
| 122 | /* |
| 123 | * Reset of interface after UNIBUS reset. |
| 124 | * If interface is on specified uba, reset its state. |
| 125 | */ |
| 126 | enreset(unit, uban) |
| 127 | int unit, uban; |
| 128 | { |
| 129 | register struct uba_device *ui; |
| 130 | COUNT(ENRESET); |
| 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 | int s; |
| 150 | |
| 151 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, |
| 152 | sizeof (struct en_header), (int)btoc(ENMTU)) == 0) { |
| 153 | printf("en%d: can't initialize\n", unit); |
| 154 | return; |
| 155 | } |
| 156 | addr = (struct endevice *)ui->ui_addr; |
| 157 | addr->en_istat = addr->en_ostat = 0; |
| 158 | |
| 159 | /* |
| 160 | * Hang a receive and start any |
| 161 | * pending writes by faking a transmit complete. |
| 162 | */ |
| 163 | s = splimp(); |
| 164 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
| 165 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
| 166 | addr->en_istat = EN_IEN|EN_GO; |
| 167 | es->es_oactive = 1; |
| 168 | enxint(unit); |
| 169 | splx(s); |
| 170 | } |
| 171 | |
| 172 | int enlastdel = 25; |
| 173 | |
| 174 | /* |
| 175 | * Start or restart output on interface. |
| 176 | * If interface is already active, then this is a retransmit |
| 177 | * after a collision, and just restuff registers and delay. |
| 178 | * If interface is not already active, get another datagram |
| 179 | * to send off of the interface queue, and map it to the interface |
| 180 | * before starting the output. |
| 181 | */ |
| 182 | enstart(dev) |
| 183 | dev_t dev; |
| 184 | { |
| 185 | int unit = ENUNIT(dev); |
| 186 | struct uba_device *ui = eninfo[unit]; |
| 187 | register struct en_softc *es = &en_softc[unit]; |
| 188 | register struct endevice *addr; |
| 189 | struct mbuf *m; |
| 190 | int dest; |
| 191 | COUNT(ENSTART); |
| 192 | |
| 193 | if (es->es_oactive) |
| 194 | goto restart; |
| 195 | |
| 196 | /* |
| 197 | * Not already active: dequeue another request |
| 198 | * and map it to the UNIBUS. If no more requests, |
| 199 | * just return. |
| 200 | */ |
| 201 | IF_DEQUEUE(&es->es_if.if_snd, m); |
| 202 | if (m == 0) { |
| 203 | es->es_oactive = 0; |
| 204 | return; |
| 205 | } |
| 206 | dest = mtod(m, struct en_header *)->en_dhost; |
| 207 | es->es_olen = if_wubaput(&es->es_ifuba, m); |
| 208 | |
| 209 | /* |
| 210 | * Ethernet cannot take back-to-back packets (no |
| 211 | * buffering in interface. To avoid overrunning |
| 212 | * receiver, enforce a small delay (about 1ms) in interface |
| 213 | * on successive packets sent to same host. |
| 214 | */ |
| 215 | if (es->es_lastx && es->es_lastx == dest) |
| 216 | es->es_delay = enlastdel; |
| 217 | else |
| 218 | es->es_lastx = dest; |
| 219 | |
| 220 | restart: |
| 221 | /* |
| 222 | * Have request mapped to UNIBUS for transmission. |
| 223 | * Purge any stale data from this BDP, and start the otput. |
| 224 | */ |
| 225 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); |
| 226 | addr = (struct endevice *)ui->ui_addr; |
| 227 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; |
| 228 | addr->en_odelay = es->es_delay; |
| 229 | addr->en_owc = -((es->es_olen + 1) >> 1); |
| 230 | addr->en_ostat = EN_IEN|EN_GO; |
| 231 | es->es_oactive = 1; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Ethernet interface transmitter interrupt. |
| 236 | * Start another output if more data to send. |
| 237 | */ |
| 238 | enxint(unit) |
| 239 | int unit; |
| 240 | { |
| 241 | register struct uba_device *ui = eninfo[unit]; |
| 242 | register struct en_softc *es = &en_softc[unit]; |
| 243 | register struct endevice *addr = (struct endevice *)ui->ui_addr; |
| 244 | COUNT(ENXINT); |
| 245 | |
| 246 | if (es->es_oactive == 0) |
| 247 | return; |
| 248 | if (es->es_mask && (addr->en_ostat&EN_OERROR)) { |
| 249 | es->es_if.if_oerrors++; |
| 250 | if (es->es_if.if_oerrors % 100 == 0) |
| 251 | printf("en%d: += 100 output errors\n", unit); |
| 252 | endocoll(unit); |
| 253 | return; |
| 254 | } |
| 255 | es->es_if.if_opackets++; |
| 256 | es->es_oactive = 0; |
| 257 | es->es_delay = 0; |
| 258 | es->es_mask = ~0; |
| 259 | if (es->es_ifuba.ifu_xtofree) { |
| 260 | m_freem(es->es_ifuba.ifu_xtofree); |
| 261 | es->es_ifuba.ifu_xtofree = 0; |
| 262 | } |
| 263 | if (es->es_if.if_snd.ifq_head == 0) { |
| 264 | es->es_lastx = 0; |
| 265 | return; |
| 266 | } |
| 267 | enstart(unit); |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Collision on ethernet interface. Do exponential |
| 272 | * backoff, and retransmit. If have backed off all |
| 273 | * the way printing warning diagnostic, and drop packet. |
| 274 | */ |
| 275 | encollide(unit) |
| 276 | int unit; |
| 277 | { |
| 278 | struct en_softc *es = &en_softc[unit]; |
| 279 | COUNT(ENCOLLIDE); |
| 280 | |
| 281 | es->es_if.if_collisions++; |
| 282 | if (es->es_oactive == 0) |
| 283 | return; |
| 284 | endocoll(unit); |
| 285 | } |
| 286 | |
| 287 | endocoll(unit) |
| 288 | int unit; |
| 289 | { |
| 290 | register struct en_softc *es = &en_softc[unit]; |
| 291 | |
| 292 | /* |
| 293 | * Es_mask is a 16 bit number with n low zero bits, with |
| 294 | * n the number of backoffs. When es_mask is 0 we have |
| 295 | * backed off 16 times, and give up. |
| 296 | */ |
| 297 | if (es->es_mask == 0) { |
| 298 | printf("en%d: send error\n", unit); |
| 299 | enxint(unit); |
| 300 | return; |
| 301 | } |
| 302 | /* |
| 303 | * Another backoff. Restart with delay based on n low bits |
| 304 | * of the interval timer. |
| 305 | */ |
| 306 | es->es_mask <<= 1; |
| 307 | es->es_delay = mfpr(ICR) &~ es->es_mask; |
| 308 | enstart(unit); |
| 309 | } |
| 310 | |
| 311 | struct sockaddr_pup pupsrc = { AF_PUP }; |
| 312 | struct sockaddr_pup pupdst = { AF_PUP }; |
| 313 | struct sockproto pupproto = { PF_PUP }; |
| 314 | /* |
| 315 | * Ethernet interface receiver interrupt. |
| 316 | * If input error just drop packet. |
| 317 | * Otherwise purge input buffered data path and examine |
| 318 | * packet to determine type. If can't determine length |
| 319 | * from type, then have to drop packet. Othewise decapsulate |
| 320 | * packet based on type and pass to type specific higher-level |
| 321 | * input routine. |
| 322 | */ |
| 323 | enrint(unit) |
| 324 | int unit; |
| 325 | { |
| 326 | register struct en_softc *es = &en_softc[unit]; |
| 327 | struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; |
| 328 | register struct en_header *en; |
| 329 | struct mbuf *m; |
| 330 | int len; |
| 331 | register struct ifqueue *inq; |
| 332 | int off; |
| 333 | COUNT(ENRINT); |
| 334 | |
| 335 | es->es_if.if_ipackets++; |
| 336 | |
| 337 | /* |
| 338 | * Purge BDP; drop if input error indicated. |
| 339 | */ |
| 340 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); |
| 341 | if (addr->en_istat&EN_IERROR) { |
| 342 | es->es_if.if_ierrors++; |
| 343 | if (es->es_if.if_ierrors % 100 == 0) |
| 344 | printf("en%d: += 100 input errors\n", unit); |
| 345 | goto setup; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Get pointer to ethernet header (in input buffer). |
| 350 | * Deal with trailer protocol: if type is PUP trailer |
| 351 | * get true type from first 16-bit word past data. |
| 352 | * Remember that type was trailer by setting off. |
| 353 | */ |
| 354 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); |
| 355 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
| 356 | if (en->en_type >= ENPUP_TRAIL && |
| 357 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { |
| 358 | off = (en->en_type - ENPUP_TRAIL) * 512; |
| 359 | if (off >= ENMTU) |
| 360 | goto setup; /* sanity */ |
| 361 | en->en_type = *endataaddr(en, off, u_short *); |
| 362 | } else |
| 363 | off = 0; |
| 364 | |
| 365 | /* |
| 366 | * Attempt to infer packet length from type; |
| 367 | * can't deal with packet if can't infer length. |
| 368 | */ |
| 369 | switch (en->en_type) { |
| 370 | |
| 371 | #ifdef INET |
| 372 | case ENPUP_IPTYPE: |
| 373 | len = htons((u_short)endataaddr(en, off ? off+2 : 0, struct ip *)->ip_len); |
| 374 | if (off) |
| 375 | len += 2; |
| 376 | break; |
| 377 | #endif |
| 378 | #ifdef PUP |
| 379 | case ENPUP_PUPTYPE: |
| 380 | len = endataaddr(en, off, struct pup_header *)->pup_length; |
| 381 | if (off) |
| 382 | len -= 2; |
| 383 | break; |
| 384 | #endif |
| 385 | |
| 386 | default: |
| 387 | printf("en%d: unknown pkt type 0x%x\n", unit, en->en_type); |
| 388 | goto setup; |
| 389 | } |
| 390 | if (len == 0) |
| 391 | goto setup; |
| 392 | |
| 393 | /* |
| 394 | * Pull packet off interface. Off is nonzero if packet |
| 395 | * has trailing header; if_rubaget will then force this header |
| 396 | * information to be at the front, but we still have to drop |
| 397 | * the two-byte type which is at the front of any trailer data. |
| 398 | */ |
| 399 | m = if_rubaget(&es->es_ifuba, len, off); |
| 400 | if (m == 0) |
| 401 | goto setup; |
| 402 | if (off) { |
| 403 | m->m_off += 2; |
| 404 | m->m_len -= 2; |
| 405 | } |
| 406 | switch (en->en_type) { |
| 407 | |
| 408 | #ifdef INET |
| 409 | case ENPUP_IPTYPE: |
| 410 | schednetisr(NETISR_IP); |
| 411 | inq = &ipintrq; |
| 412 | break; |
| 413 | #endif |
| 414 | case ENPUP_PUPTYPE: { |
| 415 | struct pup_header *pup = mtod(m, struct pup_header *); |
| 416 | |
| 417 | pupproto.sp_protocol = pup->pup_type; |
| 418 | pupdst.spup_addr = pup->pup_dport; |
| 419 | pupsrc.spup_addr = pup->pup_sport; |
| 420 | raw_input(m, &pupproto, (struct sockaddr *)&pupdst, |
| 421 | (struct sockaddr *)&pupsrc); |
| 422 | goto setup; |
| 423 | } |
| 424 | } |
| 425 | if (IF_QFULL(inq)) { |
| 426 | IF_DROP(inq); |
| 427 | (void) m_freem(m); |
| 428 | } else |
| 429 | IF_ENQUEUE(inq, m); |
| 430 | |
| 431 | setup: |
| 432 | /* |
| 433 | * Reset for next packet. |
| 434 | */ |
| 435 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
| 436 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
| 437 | addr->en_istat = EN_IEN|EN_GO; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Ethernet output routine. |
| 442 | * Encapsulate a packet of type family for the local net. |
| 443 | * Use trailer local net encapsulation if enough data in first |
| 444 | * packet leaves a multiple of 512 bytes of data in remainder. |
| 445 | */ |
| 446 | enoutput(ifp, m0, pf) |
| 447 | struct ifnet *ifp; |
| 448 | struct mbuf *m0; |
| 449 | int pf; |
| 450 | { |
| 451 | int type, dest, s, off; |
| 452 | register struct mbuf *m = m0; |
| 453 | register struct en_header *en; |
| 454 | |
| 455 | COUNT(ENOUTPUT); |
| 456 | switch (pf) { |
| 457 | |
| 458 | #ifdef INET |
| 459 | case PF_INET: { |
| 460 | register struct ip *ip = mtod(m0, struct ip *); |
| 461 | |
| 462 | #ifndef ENKLUDGE |
| 463 | dest = ip->ip_dst.s_addr >> 24; |
| 464 | #else |
| 465 | dest = (ip->ip_dst.s_addr >> 8) & 0xff; |
| 466 | #endif |
| 467 | off = ntohs((u_short)ip->ip_len) - m->m_len; |
| 468 | #ifndef ENKLUDGE |
| 469 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
| 470 | type = ENPUP_TRAIL + (off>>9); |
| 471 | m->m_off -= 2; |
| 472 | m->m_len += 2; |
| 473 | *mtod(m, u_short *) = ENPUP_IPTYPE; |
| 474 | goto gottrailertype; |
| 475 | } |
| 476 | #endif |
| 477 | type = ENPUP_IPTYPE; |
| 478 | off = 0; |
| 479 | goto gottype; |
| 480 | } |
| 481 | #endif |
| 482 | #ifdef PUP |
| 483 | case PF_PUP: { |
| 484 | register struct pup_header *pup = mtod(m, struct pup_header *); |
| 485 | |
| 486 | dest = pup->pup_dhost; |
| 487 | off = pup->pup_length - m->m_len; |
| 488 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
| 489 | type = ENPUP_TRAIL + (off>>9); |
| 490 | m->m_off -= 2; |
| 491 | m->m_len += 2; |
| 492 | *mtod(m, u_short *) = ENPUP_PUPTYPE; |
| 493 | goto gottrailertype; |
| 494 | } |
| 495 | type = ENPUP_PUPTYPE; |
| 496 | off = 0; |
| 497 | goto gottype; |
| 498 | } |
| 499 | #endif |
| 500 | |
| 501 | default: |
| 502 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); |
| 503 | m_freem(m0); |
| 504 | return (0); |
| 505 | } |
| 506 | |
| 507 | gottrailertype: |
| 508 | /* |
| 509 | * Packet to be sent as trailer: move first packet |
| 510 | * (control information) to end of chain. |
| 511 | */ |
| 512 | while (m->m_next) |
| 513 | m = m->m_next; |
| 514 | m->m_next = m0; |
| 515 | m = m0->m_next; |
| 516 | m0->m_next = 0; |
| 517 | m0 = m; |
| 518 | |
| 519 | gottype: |
| 520 | /* |
| 521 | * Add local net header. If no space in first mbuf, |
| 522 | * allocate another. |
| 523 | */ |
| 524 | if (m->m_off > MMAXOFF || |
| 525 | MMINOFF + sizeof (struct en_header) > m->m_off) { |
| 526 | m = m_get(M_DONTWAIT); |
| 527 | if (m == 0) { |
| 528 | m_freem(m0); |
| 529 | return (0); |
| 530 | } |
| 531 | m->m_next = m0; |
| 532 | m->m_off = MMINOFF; |
| 533 | m->m_len = sizeof (struct en_header); |
| 534 | } else { |
| 535 | m->m_off -= sizeof (struct en_header); |
| 536 | m->m_len += sizeof (struct en_header); |
| 537 | } |
| 538 | en = mtod(m, struct en_header *); |
| 539 | en->en_shost = ifp->if_host[0]; |
| 540 | en->en_dhost = dest; |
| 541 | en->en_type = type; |
| 542 | |
| 543 | /* |
| 544 | * Queue message on interface, and start output if interface |
| 545 | * not yet active. |
| 546 | */ |
| 547 | s = splimp(); |
| 548 | if (IF_QFULL(&ifp->if_snd)) { |
| 549 | IF_DROP(&ifp->if_snd); |
| 550 | m_freem(m); |
| 551 | splx(s); |
| 552 | return (0); |
| 553 | } |
| 554 | IF_ENQUEUE(&ifp->if_snd, m); |
| 555 | if (en_softc[ifp->if_unit].es_oactive == 0) |
| 556 | enstart(ifp->if_unit); |
| 557 | splx(s); |
| 558 | return (1); |
| 559 | } |