1 /* if_ec.c 4.20 82/06/23 */ 2 3 #include "ec.h" 4 5 /* 6 * 3Com Ethernet Controller interface 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/ecreg.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_ec.h" 26 #include "../net/if_uba.h" 27 #include "../net/ip.h" 28 #include "../net/ip_var.h" 29 #include "../net/pup.h" 30 #include "../net/route.h" 31 #include <errno.h> 32 33 #define ECMTU 1500 34 35 int ecprobe(), ecattach(), ecrint(), ecxint(), eccollide(); 36 struct uba_device *ecinfo[NEC]; 37 u_short ecstd[] = { 0 }; 38 struct uba_driver ecdriver = 39 { ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo }; 40 u_char ec_iltop[3] = { 0x02, 0x07, 0x01 }; 41 #define ECUNIT(x) minor(x) 42 43 int ecinit(),ecoutput(),ecreset(); 44 struct mbuf *ecget(); 45 46 extern struct ifnet loif; 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 ec_softc { 61 struct ifnet es_if; /* network-visible interface */ 62 struct ifuba es_ifuba; /* UNIBUS resources */ 63 short es_mask; /* mask for current output delay */ 64 short es_oactive; /* is output active? */ 65 caddr_t es_buf[16]; /* virtual addresses of buffers */ 66 u_char es_enaddr[6]; /* board's ethernet address */ 67 } ec_softc[NEC]; 68 69 /* 70 * Do output DMA to determine interface presence and 71 * interrupt vector. DMA is too short to disturb other hosts. 72 */ 73 ecprobe(reg) 74 caddr_t reg; 75 { 76 register int br, cvec; /* r11, r10 value-result */ 77 register struct ecdevice *addr = (struct ecdevice *)reg; 78 register caddr_t ecbuf = (caddr_t) &umem[0][0600000]; 79 80 #ifdef lint 81 br = 0; cvec = br; br = cvec; 82 ecrint(0); ecxint(0); eccollide(0); 83 #endif 84 /* 85 * Make sure memory is turned on 86 */ 87 addr->ec_rcr = EC_AROM; 88 /* 89 * Check for existence of buffers on Unibus. 90 * This won't work on a 780 until more work is done. 91 */ 92 if (badaddr((caddr_t) ecbuf, 2)) { 93 printf("ec: buffer mem not found"); 94 return (0); 95 } 96 97 /* 98 * Tell the system that the board has memory here, so it won't 99 * attempt to allocate the addresses later. 100 */ 101 ubamem(0, 0600000, 32*2); 102 103 /* 104 * Make a one byte packet in what should be buffer #0. 105 * Submit it for sending. This whould cause an xmit interrupt. 106 * The xmit interrupt vector is 8 bytes after the receive vector, 107 * so adjust for this before returning. 108 */ 109 *(u_short *)ecbuf = (u_short) 03777; 110 ecbuf[03777] = '\0'; 111 addr->ec_xcr = EC_XINTEN|EC_XWBN; 112 DELAY(100000); 113 addr->ec_xcr = EC_XCLR; 114 if (cvec > 0 && cvec != 0x200) { 115 cvec -= 010; 116 br += 2; /* rcv is xmit + 2 */ 117 } 118 return (1); 119 } 120 121 /* 122 * Interface exists: make available by filling in network interface 123 * record. System will initialize the interface when it is ready 124 * to accept packets. 125 */ 126 ecattach(ui) 127 struct uba_device *ui; 128 { 129 struct ec_softc *es = &ec_softc[ui->ui_unit]; 130 register struct ifnet *ifp = &es->es_if; 131 register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr; 132 struct sockaddr_in *sin; 133 int i, j; 134 u_char *cp; 135 136 ifp->if_unit = ui->ui_unit; 137 ifp->if_name = "ec"; 138 ifp->if_mtu = ECMTU; 139 ifp->if_net = ui->ui_flags; 140 141 /* 142 * Read the ethernet address off the board, one nibble at a time. 143 */ 144 addr->ec_xcr = EC_UECLR; 145 addr->ec_rcr = EC_AROM; 146 cp = es->es_enaddr; 147 #define NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM 148 for (i=0; i<6; i++) { 149 *cp = 0; 150 for (j=0; j<=4; j+=4) { 151 *cp |= ((addr->ec_rcr >> 8) & 0xf) << j; 152 NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT; 153 } 154 cp++; 155 } 156 #ifdef notdef 157 printf("ec%d: addr=%x:%x:%x:%x:%x:%x\n", ui->ui_unit, 158 es->es_enaddr[0]&0xff, es->es_enaddr[1]&0xff, 159 es->es_enaddr[2]&0xff, es->es_enaddr[3]&0xff, 160 es->es_enaddr[4]&0xff, es->es_enaddr[5]&0xff); 161 #endif 162 ifp->if_host[0] = ((es->es_enaddr[3]&0xff)<<16) | 163 ((es->es_enaddr[4]&0xff)<<8) | (es->es_enaddr[5]&0xff); 164 sin = (struct sockaddr_in *)&es->es_if.if_addr; 165 sin->sin_family = AF_INET; 166 sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); 167 168 sin = (struct sockaddr_in *)&ifp->if_broadaddr; 169 sin->sin_family = AF_INET; 170 sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); 171 ifp->if_flags = IFF_BROADCAST; 172 173 ifp->if_init = ecinit; 174 ifp->if_output = ecoutput; 175 ifp->if_ubareset = ecreset; 176 for (i=0; i<16; i++) 177 es->es_buf[i] = &umem[ui->ui_ubanum][0600000+2048*i]; 178 if_attach(ifp); 179 } 180 181 /* 182 * Reset of interface after UNIBUS reset. 183 * If interface is on specified uba, reset its state. 184 */ 185 ecreset(unit, uban) 186 int unit, uban; 187 { 188 register struct uba_device *ui; 189 190 if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 || 191 ui->ui_ubanum != uban) 192 return; 193 printf(" ec%d", unit); 194 ecinit(unit); 195 } 196 197 /* 198 * Initialization of interface; clear recorded pending 199 * operations, and reinitialize UNIBUS usage. 200 */ 201 ecinit(unit) 202 int unit; 203 { 204 struct ec_softc *es = &ec_softc[unit]; 205 struct ecdevice *addr; 206 int i, s; 207 208 /* 209 * Hang receive buffers and start any pending writes. 210 * Writing into the rcr also makes sure the memory 211 * is turned on. 212 */ 213 addr = (struct ecdevice *)ecinfo[unit]->ui_addr; 214 s = splimp(); 215 for (i=ECRHBF; i>=ECRLBF; i--) 216 addr->ec_rcr = EC_READ|i; 217 es->es_oactive = 0; 218 es->es_mask = ~0; 219 es->es_if.if_flags |= IFF_UP; 220 if (es->es_if.if_snd.ifq_head) 221 ecstart(unit); 222 splx(s); 223 if_rtinit(&es->es_if, RTF_UP); 224 } 225 226 /* 227 * Start or restart output on interface. 228 * If interface is already active, then this is a retransmit 229 * after a collision, and just restuff registers. 230 * If interface is not already active, get another datagram 231 * to send off of the interface queue, and map it to the interface 232 * before starting the output. 233 */ 234 ecstart(dev) 235 dev_t dev; 236 { 237 int unit = ECUNIT(dev), dest; 238 struct ec_softc *es = &ec_softc[unit]; 239 struct ecdevice *addr; 240 struct mbuf *m; 241 caddr_t ecbuf; 242 243 if (es->es_oactive) 244 goto restart; 245 246 IF_DEQUEUE(&es->es_if.if_snd, m); 247 if (m == 0) { 248 es->es_oactive = 0; 249 return; 250 } 251 ecput(es->es_buf[ECTBF], m); 252 253 restart: 254 addr = (struct ecdevice *)ecinfo[unit]->ui_addr; 255 addr->ec_xcr = EC_WRITE|ECTBF; 256 es->es_oactive = 1; 257 } 258 259 /* 260 * Ethernet interface transmitter interrupt. 261 * Start another output if more data to send. 262 */ 263 ecxint(unit) 264 int unit; 265 { 266 register struct ec_softc *es = &ec_softc[unit]; 267 register struct ecdevice *addr = 268 (struct ecdevice *)ecinfo[unit]->ui_addr; 269 270 if (es->es_oactive == 0) 271 return; 272 if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) { 273 printf("ec%d: stray xmit interrupt, xcr=%b\n", unit, 274 addr->ec_xcr, EC_XBITS); 275 es->es_oactive = 0; 276 addr->ec_xcr = EC_XCLR; 277 return; 278 } 279 es->es_if.if_opackets++; 280 es->es_oactive = 0; 281 es->es_mask = ~0; 282 addr->ec_xcr = EC_XCLR; 283 if (es->es_if.if_snd.ifq_head) 284 ecstart(unit); 285 } 286 287 /* 288 * Collision on ethernet interface. Do exponential 289 * backoff, and retransmit. If have backed off all 290 * the way print warning diagnostic, and drop packet. 291 */ 292 eccollide(unit) 293 int unit; 294 { 295 struct ec_softc *es = &ec_softc[unit]; 296 297 es->es_if.if_collisions++; 298 if (es->es_oactive) 299 ecdocoll(unit); 300 } 301 302 ecdocoll(unit) 303 int unit; 304 { 305 register struct ec_softc *es = &ec_softc[unit]; 306 register struct ecdevice *addr = 307 (struct ecdevice *)ecinfo[unit]->ui_addr; 308 register i; 309 int delay; 310 311 /* 312 * Es_mask is a 16 bit number with n low zero bits, with 313 * n the number of backoffs. When es_mask is 0 we have 314 * backed off 16 times, and give up. 315 */ 316 if (es->es_mask == 0) { 317 es->es_if.if_oerrors++; 318 printf("ec%d: send error\n", unit); 319 /* 320 * Reset interface, then requeue rcv buffers. 321 * Some incoming packets may be lost, but that 322 * can't be helped. 323 */ 324 addr->ec_xcr = EC_UECLR; 325 for (i=ECRHBF; i>=ECRLBF; i--) 326 addr->ec_rcr = EC_READ|i; 327 /* 328 * Reset and transmit next packet (if any). 329 */ 330 es->es_oactive = 0; 331 es->es_mask = ~0; 332 if (es->es_if.if_snd.ifq_head) 333 ecstart(unit); 334 return; 335 } 336 /* 337 * Do exponential backoff. Compute delay based on low bits 338 * of the interval timer. Then delay for that number of 339 * slot times. A slot time is 51.2 microseconds (rounded to 51). 340 * This does not take into account the time already used to 341 * process the interrupt. 342 */ 343 es->es_mask <<= 1; 344 delay = mfpr(ICR) &~ es->es_mask; 345 DELAY(delay * 51); 346 /* 347 * Clear the controller's collision flag, thus enabling retransmit. 348 */ 349 addr->ec_xcr = EC_JINTEN|EC_XINTEN|EC_JCLR; 350 } 351 352 /* 353 * Ethernet interface receiver interrupt. 354 * If input error just drop packet. 355 * Otherwise purge input buffered data path and examine 356 * packet to determine type. If can't determine length 357 * from type, then have to drop packet. Othewise decapsulate 358 * packet based on type and pass to type specific higher-level 359 * input routine. 360 */ 361 ecrint(unit) 362 int unit; 363 { 364 struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; 365 366 while (addr->ec_rcr & EC_RDONE) 367 ecread(unit); 368 } 369 370 ecread(unit) 371 int unit; 372 { 373 register struct ec_softc *es = &ec_softc[unit]; 374 struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; 375 register struct ec_header *ec; 376 struct mbuf *m; 377 int len, off, resid, ecoff, buf; 378 register struct ifqueue *inq; 379 caddr_t ecbuf; 380 381 es->es_if.if_ipackets++; 382 buf = addr->ec_rcr & EC_RBN; 383 if (buf < ECRLBF || buf > ECRHBF) 384 panic("ecrint"); 385 ecbuf = es->es_buf[buf]; 386 ecoff = *(short *)ecbuf; 387 if (ecoff <= ECRDOFF || ecoff > 2046) { 388 es->es_if.if_ierrors++; 389 #ifdef notdef 390 if (es->es_if.if_ierrors % 100 == 0) 391 printf("ec%d: += 100 input errors\n", unit); 392 #endif 393 goto setup; 394 } 395 396 /* 397 * Get input data length. 398 * Get pointer to ethernet header (in input buffer). 399 * Deal with trailer protocol: if type is PUP trailer 400 * get true type from first 16-bit word past data. 401 * Remember that type was trailer by setting off. 402 */ 403 len = ecoff - ECRDOFF - sizeof (struct ec_header); 404 ec = (struct ec_header *)(ecbuf + ECRDOFF); 405 #define ecdataaddr(ec, off, type) ((type)(((caddr_t)((ec)+1)+(off)))) 406 if (ec->ec_type >= ECPUP_TRAIL && 407 ec->ec_type < ECPUP_TRAIL+ECPUP_NTRAILER) { 408 off = (ec->ec_type - ECPUP_TRAIL) * 512; 409 if (off >= ECMTU) 410 goto setup; /* sanity */ 411 ec->ec_type = *ecdataaddr(ec, off, u_short *); 412 resid = *(ecdataaddr(ec, off+2, u_short *)); 413 if (off + resid > len) 414 goto setup; /* sanity */ 415 len = off + resid; 416 } else 417 off = 0; 418 if (len == 0) 419 goto setup; 420 421 /* 422 * Pull packet off interface. Off is nonzero if packet 423 * has trailing header; ecget will then force this header 424 * information to be at the front, but we still have to drop 425 * the type and length which are at the front of any trailer data. 426 */ 427 m = ecget(ecbuf, len, off); 428 if (m == 0) 429 goto setup; 430 if (off) { 431 m->m_off += 2 * sizeof (u_short); 432 m->m_len -= 2 * sizeof (u_short); 433 } 434 switch (ec->ec_type) { 435 436 #ifdef INET 437 case ECPUP_IPTYPE: 438 schednetisr(NETISR_IP); 439 inq = &ipintrq; 440 break; 441 #endif 442 default: 443 m_freem(m); 444 goto setup; 445 } 446 447 if (IF_QFULL(inq)) { 448 IF_DROP(inq); 449 m_freem(m); 450 goto setup; 451 } 452 IF_ENQUEUE(inq, m); 453 454 setup: 455 /* 456 * Reset for next packet. 457 */ 458 addr->ec_rcr = EC_READ|EC_RCLR|buf; 459 } 460 461 /* 462 * Ethernet output routine. 463 * Encapsulate a packet of type family for the local net. 464 * Use trailer local net encapsulation if enough data in first 465 * packet leaves a multiple of 512 bytes of data in remainder. 466 * If destination is this address or broadcast, send packet to 467 * loop device to kludge around the fact that 3com interfaces can't 468 * talk to themselves. 469 */ 470 ecoutput(ifp, m0, dst) 471 struct ifnet *ifp; 472 struct mbuf *m0; 473 struct sockaddr *dst; 474 { 475 int type, dest, s, error; 476 register struct ec_softc *es = &ec_softc[ifp->if_unit]; 477 register struct mbuf *m = m0; 478 register struct ec_header *ec; 479 register int off, i; 480 struct mbuf *mcopy = (struct mbuf *) 0; /* Null */ 481 482 switch (dst->sa_family) { 483 484 #ifdef INET 485 case AF_INET: 486 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 487 if ((dest &~ 0xff) == 0) 488 mcopy = m_copy(m, 0, M_COPYALL); 489 else if (dest == ((struct sockaddr_in *)&es->es_if.if_addr)-> 490 sin_addr.s_addr) { 491 mcopy = m; 492 goto gotlocal; 493 } 494 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 495 if (off > 0 && (off & 0x1ff) == 0 && 496 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 497 type = ECPUP_TRAIL + (off>>9); 498 m->m_off -= 2 * sizeof (u_short); 499 m->m_len += 2 * sizeof (u_short); 500 *mtod(m, u_short *) = ECPUP_IPTYPE; 501 *(mtod(m, u_short *) + 1) = m->m_len; 502 goto gottrailertype; 503 } 504 type = ECPUP_IPTYPE; 505 off = 0; 506 goto gottype; 507 #endif 508 509 default: 510 printf("ec%d: can't handle af%d\n", ifp->if_unit, 511 dst->sa_family); 512 error = EAFNOSUPPORT; 513 goto bad; 514 } 515 516 gottrailertype: 517 /* 518 * Packet to be sent as trailer: move first packet 519 * (control information) to end of chain. 520 */ 521 while (m->m_next) 522 m = m->m_next; 523 m->m_next = m0; 524 m = m0->m_next; 525 m0->m_next = 0; 526 m0 = m; 527 528 gottype: 529 /* 530 * Add local net header. If no space in first mbuf, 531 * allocate another. 532 */ 533 if (m->m_off > MMAXOFF || 534 MMINOFF + sizeof (struct ec_header) > m->m_off) { 535 m = m_get(M_DONTWAIT); 536 if (m == 0) { 537 error = ENOBUFS; 538 goto bad; 539 } 540 m->m_next = m0; 541 m->m_off = MMINOFF; 542 m->m_len = sizeof (struct ec_header); 543 } else { 544 m->m_off -= sizeof (struct ec_header); 545 m->m_len += sizeof (struct ec_header); 546 } 547 ec = mtod(m, struct ec_header *); 548 for (i=0; i<6; i++) 549 ec->ec_shost[i] = es->es_enaddr[i]; 550 if ((dest &~ 0xff) == 0) 551 /* broadcast address */ 552 for (i=0; i<6; i++) 553 ec->ec_dhost[i] = 0xff; 554 else { 555 if (dest & 0x8000) { 556 ec->ec_dhost[0] = ec_iltop[0]; 557 ec->ec_dhost[1] = ec_iltop[1]; 558 ec->ec_dhost[2] = ec_iltop[2]; 559 } else { 560 ec->ec_dhost[0] = es->es_enaddr[0]; 561 ec->ec_dhost[1] = es->es_enaddr[1]; 562 ec->ec_dhost[2] = es->es_enaddr[2]; 563 } 564 ec->ec_dhost[3] = (dest>>8) & 0x7f; 565 ec->ec_dhost[4] = (dest>>16) & 0xff; 566 ec->ec_dhost[5] = (dest>>24) & 0xff; 567 } 568 ec->ec_type = type; 569 570 /* 571 * Queue message on interface, and start output if interface 572 * not yet active. 573 */ 574 s = splimp(); 575 if (IF_QFULL(&ifp->if_snd)) { 576 IF_DROP(&ifp->if_snd); 577 error = ENOBUFS; 578 goto qfull; 579 } 580 IF_ENQUEUE(&ifp->if_snd, m); 581 if (es->es_oactive == 0) 582 ecstart(ifp->if_unit); 583 splx(s); 584 585 gotlocal: 586 return(mcopy ? looutput(&loif, mcopy, dst) : 0); 587 588 qfull: 589 m0 = m; 590 splx(s); 591 bad: 592 m_freem(m0); 593 return(error); 594 } 595 596 /* 597 * Routine to copy from mbuf chain to transmitter 598 * buffer in UNIBUS memory. 599 */ 600 ecput(ecbuf, m) 601 u_char *ecbuf; 602 struct mbuf *m; 603 { 604 register struct mbuf *mp; 605 register int off; 606 u_char *bp; 607 608 for (off = 2048, mp = m; mp; mp = mp->m_next) 609 off -= mp->m_len; 610 *(u_short *)ecbuf = off; 611 bp = (u_char *)(ecbuf + off); 612 for (mp = m; mp; mp = mp->m_next) { 613 register unsigned len = mp->m_len; 614 u_char *mcp; 615 616 if (len == 0) 617 continue; 618 mcp = mtod(mp, u_char *); 619 if ((unsigned)bp & 01) { 620 *bp++ = *mcp++; 621 len--; 622 } 623 if (off = (len >> 1)) { 624 register u_short *to, *from; 625 626 to = (u_short *)bp; 627 from = (u_short *)mcp; 628 do 629 *to++ = *from++; 630 while (--off > 0); 631 bp = (u_char *)to, 632 mcp = (u_char *)from; 633 } 634 if (len & 01) 635 *bp++ = *mcp++; 636 } 637 #ifdef notdef 638 if (bp - ecbuf != 2048) 639 printf("ec: bad ecput, diff=%d\n", bp-ecbuf); 640 #endif 641 m_freem(m); 642 } 643 644 /* 645 * Routine to copy from UNIBUS memory into mbufs. 646 * Similar in spirit to if_rubaget. 647 * 648 * Warning: This makes the fairly safe assumption that 649 * mbufs have even lengths. 650 */ 651 struct mbuf * 652 ecget(ecbuf, totlen, off0) 653 u_char *ecbuf; 654 int totlen, off0; 655 { 656 register struct mbuf *m; 657 struct mbuf *top = 0, **mp = ⊤ 658 register int off = off0, len; 659 u_char *cp; 660 661 cp = ecbuf + ECRDOFF + sizeof (struct ec_header); 662 while (totlen > 0) { 663 register int words; 664 u_char *mcp; 665 666 MGET(m, 0); 667 if (m == 0) 668 goto bad; 669 if (off) { 670 len = totlen - off; 671 cp = ecbuf + ECRDOFF + sizeof (struct ec_header) + off; 672 } else 673 len = totlen; 674 if (len >= CLBYTES) { 675 struct mbuf *p; 676 677 MCLGET(p, 1); 678 if (p != 0) { 679 m->m_len = len = CLBYTES; 680 m->m_off = (int)p - (int)m; 681 } else { 682 m->m_len = len = MIN(MLEN, len); 683 m->m_off = MMINOFF; 684 } 685 } else { 686 m->m_len = len = MIN(MLEN, len); 687 m->m_off = MMINOFF; 688 } 689 mcp = mtod(m, u_char *); 690 if (words = (len >> 1)) { 691 register u_short *to, *from; 692 693 to = (u_short *)mcp; 694 from = (u_short *)cp; 695 do 696 *to++ = *from++; 697 while (--words > 0); 698 mcp = (u_char *)to; 699 cp = (u_char *)from; 700 } 701 if (len & 01) 702 *mcp++ = *cp++; 703 *mp = m; 704 mp = &m->m_next; 705 if (off == 0) { 706 totlen -= len; 707 continue; 708 } 709 off += len; 710 if (off == totlen) { 711 cp = ecbuf + ECRDOFF + sizeof (struct ec_header); 712 off = 0; 713 totlen = off0; 714 } 715 } 716 return (top); 717 bad: 718 m_freem(top); 719 return (0); 720 } 721