1 /*- 2 * Copyright (c) 1997 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 27 * $Id: if_plip.c,v 1.11 1999/02/14 11:59:59 nsouch Exp $ 28 */ 29 30 /* 31 * Parallel port TCP/IP interfaces added. I looked at the driver from 32 * MACH but this is a complete rewrite, and btw. incompatible, and it 33 * should perform better too. I have never run the MACH driver though. 34 * 35 * This driver sends two bytes (0x08, 0x00) in front of each packet, 36 * to allow us to distinguish another format later. 37 * 38 * Now added an Linux/Crynwr compatibility mode which is enabled using 39 * IF_LINK0 - Tim Wilkinson. 40 * 41 * TODO: 42 * Make HDLC/PPP mode, use IF_LLC1 to enable. 43 * 44 * Connect the two computers using a Laplink parallel cable to use this 45 * feature: 46 * 47 * +----------------------------------------+ 48 * |A-name A-End B-End Descr. Port/Bit | 49 * +----------------------------------------+ 50 * |DATA0 2 15 Data 0/0x01 | 51 * |-ERROR 15 2 1/0x08 | 52 * +----------------------------------------+ 53 * |DATA1 3 13 Data 0/0x02 | 54 * |+SLCT 13 3 1/0x10 | 55 * +----------------------------------------+ 56 * |DATA2 4 12 Data 0/0x04 | 57 * |+PE 12 4 1/0x20 | 58 * +----------------------------------------+ 59 * |DATA3 5 10 Strobe 0/0x08 | 60 * |-ACK 10 5 1/0x40 | 61 * +----------------------------------------+ 62 * |DATA4 6 11 Data 0/0x10 | 63 * |BUSY 11 6 1/~0x80 | 64 * +----------------------------------------+ 65 * |GND 18-25 18-25 GND - | 66 * +----------------------------------------+ 67 * 68 * Expect transfer-rates up to 75 kbyte/sec. 69 * 70 * If GCC could correctly grok 71 * register int port asm("edx") 72 * the code would be cleaner 73 * 74 * Poul-Henning Kamp <phk@freebsd.org> 75 */ 76 77 /* 78 * Update for ppbus, PLIP support only - Nicolas Souchu 79 */ 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/mbuf.h> 84 #include <sys/socket.h> 85 #include <sys/sockio.h> 86 #include <sys/kernel.h> 87 #include <sys/malloc.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/netisr.h> 92 93 #include <netinet/in.h> 94 #include <netinet/in_var.h> 95 96 #include "bpfilter.h" 97 #if NBPFILTER > 0 98 #include <net/bpf.h> 99 #endif 100 101 #include <dev/ppbus/ppbconf.h> 102 103 #include "opt_plip.h" 104 105 #ifndef LPMTU /* MTU for the lp# interfaces */ 106 #define LPMTU 1500 107 #endif 108 109 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 110 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 111 #endif 112 113 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 114 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 115 #endif 116 117 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 118 #define LPMAXERRS 100 119 #endif 120 121 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 122 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 123 #define MLPIPHDRLEN CLPIPHDRLEN 124 125 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 126 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 127 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 128 #define MLPIPHDRLEN LPIPHDRLEN 129 #endif 130 131 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 132 133 #define lprintf if (lptflag) printf 134 135 #ifdef PLIP_DEBUG 136 static int volatile lptflag = 1; 137 #else 138 static int volatile lptflag = 0; 139 #endif 140 141 struct lpt_softc { 142 unsigned short lp_unit; 143 144 struct ppb_device lp_dev; 145 146 struct ifnet sc_if; 147 u_char *sc_ifbuf; 148 int sc_iferrs; 149 }; 150 151 static int nlp = 0; 152 #define MAXPLIP 8 /* XXX not much better! */ 153 static struct lpt_softc *lpdata[MAXPLIP]; 154 155 156 /* Tables for the lp# interface */ 157 static u_char *txmith; 158 #define txmitl (txmith+(1*LPIPTBLSIZE)) 159 #define trecvh (txmith+(2*LPIPTBLSIZE)) 160 #define trecvl (txmith+(3*LPIPTBLSIZE)) 161 162 static u_char *ctxmith; 163 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 164 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 165 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 166 167 /* Functions for the lp# interface */ 168 static struct ppb_device *lpprobe(struct ppb_data *); 169 static int lpattach(struct ppb_device *); 170 171 static int lpinittables(void); 172 static int lpioctl(struct ifnet *, u_long, caddr_t); 173 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 174 struct rtentry *); 175 static void lpintr(int); 176 177 /* 178 * Make ourselves visible as a ppbus driver 179 */ 180 181 static struct ppb_driver lpdriver = { 182 lpprobe, lpattach, "lp" 183 }; 184 DATA_SET(ppbdriver_set, lpdriver); 185 186 187 /* 188 * lpprobe() 189 */ 190 static struct ppb_device * 191 lpprobe(struct ppb_data *ppb) 192 { 193 struct lpt_softc *lp; 194 195 /* if we haven't interrupts, the probe fails */ 196 if (!ppb->ppb_link->id_irq) { 197 printf("plip: not an interrupt driven port, failed.\n"); 198 return (0); 199 } 200 201 lp = (struct lpt_softc *) malloc(sizeof(struct lpt_softc), 202 M_TEMP, M_NOWAIT); 203 if (!lp) { 204 printf("lp: cannot malloc!\n"); 205 return (0); 206 } 207 bzero(lp, sizeof(struct lpt_softc)); 208 209 lpdata[nlp] = lp; 210 211 /* 212 * lp dependent initialisation. 213 */ 214 lp->lp_unit = nlp; 215 216 if (bootverbose) 217 printf("plip: irq %d\n", ppb->ppb_link->id_irq); 218 219 /* 220 * ppbus dependent initialisation. 221 */ 222 lp->lp_dev.id_unit = lp->lp_unit; 223 lp->lp_dev.name = lpdriver.name; 224 lp->lp_dev.ppb = ppb; 225 lp->lp_dev.intr = lpintr; 226 227 /* Ok, go to next device on next probe */ 228 nlp ++; 229 230 return (&lp->lp_dev); 231 } 232 233 static int 234 lpattach (struct ppb_device *dev) 235 { 236 int unit = dev->id_unit; 237 struct lpt_softc *sc = lpdata[unit]; 238 struct ifnet *ifp = &sc->sc_if; 239 240 /* 241 * Report ourselves 242 */ 243 printf("plip%d: <PLIP network interface> on ppbus %d\n", 244 dev->id_unit, dev->ppb->ppb_link->adapter_unit); 245 246 ifp->if_softc = sc; 247 ifp->if_name = "lp"; 248 ifp->if_unit = unit; 249 ifp->if_mtu = LPMTU; 250 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 251 ifp->if_ioctl = lpioctl; 252 ifp->if_output = lpoutput; 253 ifp->if_type = IFT_PARA; 254 ifp->if_hdrlen = 0; 255 ifp->if_addrlen = 0; 256 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 257 if_attach(ifp); 258 259 #if NBPFILTER > 0 260 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 261 #endif 262 263 return (1); 264 } 265 /* 266 * Build the translation tables for the LPIP (BSD unix) protocol. 267 * We don't want to calculate these nasties in our tight loop, so we 268 * precalculate them when we initialize. 269 */ 270 static int 271 lpinittables (void) 272 { 273 int i; 274 275 if (!txmith) 276 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); 277 278 if (!txmith) 279 return 1; 280 281 if (!ctxmith) 282 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); 283 284 if (!ctxmith) 285 return 1; 286 287 for (i=0; i < LPIPTBLSIZE; i++) { 288 ctxmith[i] = (i & 0xF0) >> 4; 289 ctxmitl[i] = 0x10 | (i & 0x0F); 290 ctrecvh[i] = (i & 0x78) << 1; 291 ctrecvl[i] = (i & 0x78) >> 3; 292 } 293 294 for (i=0; i < LPIPTBLSIZE; i++) { 295 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 296 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 297 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 298 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 299 } 300 301 return 0; 302 } 303 304 /* 305 * Process an ioctl request. 306 */ 307 308 static int 309 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data) 310 { 311 struct lpt_softc *sc = lpdata[ifp->if_unit]; 312 struct ifaddr *ifa = (struct ifaddr *)data; 313 struct ifreq *ifr = (struct ifreq *)data; 314 u_char *ptr; 315 int error; 316 317 switch (cmd) { 318 319 case SIOCSIFDSTADDR: 320 case SIOCAIFADDR: 321 case SIOCSIFADDR: 322 if (ifa->ifa_addr->sa_family != AF_INET) 323 return EAFNOSUPPORT; 324 325 ifp->if_flags |= IFF_UP; 326 /* FALLTHROUGH */ 327 case SIOCSIFFLAGS: 328 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 329 330 ppb_wctr(&sc->lp_dev, 0x00); 331 ifp->if_flags &= ~IFF_RUNNING; 332 333 /* IFF_UP is not set, try to release the bus anyway */ 334 ppb_release_bus(&sc->lp_dev); 335 break; 336 } 337 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 338 339 /* XXX 340 * Should the request be interruptible? 341 */ 342 if ((error = ppb_request_bus(&sc->lp_dev, PPB_WAIT|PPB_INTR))) 343 return (error); 344 345 /* Now IFF_UP means that we own the bus */ 346 347 ppb_set_mode(&sc->lp_dev, PPB_COMPATIBLE); 348 349 if (lpinittables()) { 350 ppb_release_bus(&sc->lp_dev); 351 return ENOBUFS; 352 } 353 354 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 355 M_DEVBUF, M_WAITOK); 356 if (!sc->sc_ifbuf) { 357 ppb_release_bus(&sc->lp_dev); 358 return ENOBUFS; 359 } 360 361 ppb_wctr(&sc->lp_dev, IRQENABLE); 362 ifp->if_flags |= IFF_RUNNING; 363 } 364 break; 365 366 case SIOCSIFMTU: 367 ptr = sc->sc_ifbuf; 368 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT); 369 if (!sc->sc_ifbuf) { 370 sc->sc_ifbuf = ptr; 371 return ENOBUFS; 372 } 373 if (ptr) 374 free(ptr,M_DEVBUF); 375 sc->sc_if.if_mtu = ifr->ifr_mtu; 376 break; 377 378 case SIOCGIFMTU: 379 ifr->ifr_mtu = sc->sc_if.if_mtu; 380 break; 381 382 case SIOCADDMULTI: 383 case SIOCDELMULTI: 384 if (ifr == 0) { 385 return EAFNOSUPPORT; /* XXX */ 386 } 387 switch (ifr->ifr_addr.sa_family) { 388 389 case AF_INET: 390 break; 391 392 default: 393 return EAFNOSUPPORT; 394 } 395 break; 396 397 case SIOCGIFMEDIA: 398 /* 399 * No ifmedia support at this stage; maybe use it 400 * in future for eg. protocol selection. 401 */ 402 return EINVAL; 403 404 default: 405 lprintf("LP:ioctl(0x%lx)\n", cmd); 406 return EINVAL; 407 } 408 return 0; 409 } 410 411 static __inline int 412 clpoutbyte (u_char byte, int spin, struct ppb_device *dev) 413 { 414 ppb_wdtr(dev, ctxmitl[byte]); 415 while (ppb_rstr(dev) & CLPIP_SHAKE) 416 if (--spin == 0) { 417 return 1; 418 } 419 ppb_wdtr(dev, ctxmith[byte]); 420 while (!(ppb_rstr(dev) & CLPIP_SHAKE)) 421 if (--spin == 0) { 422 return 1; 423 } 424 return 0; 425 } 426 427 static __inline int 428 clpinbyte (int spin, struct ppb_device *dev) 429 { 430 u_char c, cl; 431 432 while((ppb_rstr(dev) & CLPIP_SHAKE)) 433 if(!--spin) { 434 return -1; 435 } 436 cl = ppb_rstr(dev); 437 ppb_wdtr(dev, 0x10); 438 439 while(!(ppb_rstr(dev) & CLPIP_SHAKE)) 440 if(!--spin) { 441 return -1; 442 } 443 c = ppb_rstr(dev); 444 ppb_wdtr(dev, 0x00); 445 446 return (ctrecvl[cl] | ctrecvh[c]); 447 } 448 449 #if NBPFILTER > 0 450 static void 451 lptap(struct ifnet *ifp, struct mbuf *m) 452 { 453 /* 454 * Send a packet through bpf. We need to prepend the address family 455 * as a four byte field. Cons up a dummy header to pacify bpf. This 456 * is safe because bpf will only read from the mbuf (i.e., it won't 457 * try to free it or keep a pointer to it). 458 */ 459 u_int32_t af = AF_INET; 460 struct mbuf m0; 461 462 m0.m_next = m; 463 m0.m_len = sizeof(u_int32_t); 464 m0.m_data = (char *)⁡ 465 bpf_mtap(ifp, &m0); 466 } 467 #endif 468 469 static void 470 lpintr (int unit) 471 { 472 struct lpt_softc *sc = lpdata[unit]; 473 int len, s, j; 474 u_char *bp; 475 u_char c, cl; 476 struct mbuf *top; 477 478 s = splhigh(); 479 480 if (sc->sc_if.if_flags & IFF_LINK0) { 481 482 /* Ack. the request */ 483 ppb_wdtr(&sc->lp_dev, 0x01); 484 485 /* Get the packet length */ 486 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 487 if (j == -1) 488 goto err; 489 len = j; 490 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 491 if (j == -1) 492 goto err; 493 len = len + (j << 8); 494 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 495 goto err; 496 497 bp = sc->sc_ifbuf; 498 499 while (len--) { 500 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 501 if (j == -1) { 502 goto err; 503 } 504 *bp++ = j; 505 } 506 /* Get and ignore checksum */ 507 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 508 if (j == -1) { 509 goto err; 510 } 511 512 len = bp - sc->sc_ifbuf; 513 if (len <= CLPIPHDRLEN) 514 goto err; 515 516 sc->sc_iferrs = 0; 517 518 if (IF_QFULL(&ipintrq)) { 519 lprintf("DROP"); 520 IF_DROP(&ipintrq); 521 goto done; 522 } 523 len -= CLPIPHDRLEN; 524 sc->sc_if.if_ipackets++; 525 sc->sc_if.if_ibytes += len; 526 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 527 if (top) { 528 #if NBPFILTER > 0 529 if (sc->sc_if.if_bpf) 530 lptap(&sc->sc_if, top); 531 #endif 532 IF_ENQUEUE(&ipintrq, top); 533 schednetisr(NETISR_IP); 534 } 535 goto done; 536 } 537 while ((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) { 538 len = sc->sc_if.if_mtu + LPIPHDRLEN; 539 bp = sc->sc_ifbuf; 540 while (len--) { 541 542 cl = ppb_rstr(&sc->lp_dev); 543 ppb_wdtr(&sc->lp_dev, 8); 544 545 j = LPMAXSPIN2; 546 while((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) 547 if(!--j) goto err; 548 549 c = ppb_rstr(&sc->lp_dev); 550 ppb_wdtr(&sc->lp_dev, 0); 551 552 *bp++= trecvh[cl] | trecvl[c]; 553 554 j = LPMAXSPIN2; 555 while (!((cl=ppb_rstr(&sc->lp_dev)) & LPIP_SHAKE)) { 556 if (cl != c && 557 (((cl = ppb_rstr(&sc->lp_dev)) ^ 0xb8) & 0xf8) == 558 (c & 0xf8)) 559 goto end; 560 if (!--j) goto err; 561 } 562 } 563 564 end: 565 len = bp - sc->sc_ifbuf; 566 if (len <= LPIPHDRLEN) 567 goto err; 568 569 sc->sc_iferrs = 0; 570 571 if (IF_QFULL(&ipintrq)) { 572 lprintf("DROP"); 573 IF_DROP(&ipintrq); 574 goto done; 575 } 576 len -= LPIPHDRLEN; 577 sc->sc_if.if_ipackets++; 578 sc->sc_if.if_ibytes += len; 579 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 580 if (top) { 581 #if NBPFILTER > 0 582 if (sc->sc_if.if_bpf) 583 lptap(&sc->sc_if, top); 584 #endif 585 IF_ENQUEUE(&ipintrq, top); 586 schednetisr(NETISR_IP); 587 } 588 } 589 goto done; 590 591 err: 592 ppb_wdtr(&sc->lp_dev, 0); 593 lprintf("R"); 594 sc->sc_if.if_ierrors++; 595 sc->sc_iferrs++; 596 597 /* 598 * We are not able to send receive anything for now, 599 * so stop wasting our time 600 */ 601 if (sc->sc_iferrs > LPMAXERRS) { 602 printf("lp%d: Too many errors, Going off-line.\n", unit); 603 ppb_wctr(&sc->lp_dev, 0x00); 604 sc->sc_if.if_flags &= ~IFF_RUNNING; 605 sc->sc_iferrs=0; 606 } 607 608 done: 609 splx(s); 610 return; 611 } 612 613 static __inline int 614 lpoutbyte (u_char byte, int spin, struct ppb_device *dev) 615 { 616 ppb_wdtr(dev, txmith[byte]); 617 while (!(ppb_rstr(dev) & LPIP_SHAKE)) 618 if (--spin == 0) 619 return 1; 620 ppb_wdtr(dev, txmitl[byte]); 621 while (ppb_rstr(dev) & LPIP_SHAKE) 622 if (--spin == 0) 623 return 1; 624 return 0; 625 } 626 627 static int 628 lpoutput (struct ifnet *ifp, struct mbuf *m, 629 struct sockaddr *dst, struct rtentry *rt) 630 { 631 struct lpt_softc *sc = lpdata[ifp->if_unit]; 632 int s, err; 633 struct mbuf *mm; 634 u_char *cp = "\0\0"; 635 u_char chksum = 0; 636 int count = 0; 637 int i, len, spin; 638 639 /* We need a sensible value if we abort */ 640 cp++; 641 ifp->if_flags |= IFF_RUNNING; 642 643 err = 1; /* assume we're aborting because of an error */ 644 645 s = splhigh(); 646 647 /* Suspend (on laptops) or receive-errors might have taken us offline */ 648 ppb_wctr(&sc->lp_dev, IRQENABLE); 649 650 if (ifp->if_flags & IFF_LINK0) { 651 652 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) { 653 lprintf("&"); 654 lpintr(ifp->if_unit); 655 } 656 657 /* Alert other end to pending packet */ 658 spin = LPMAXSPIN1; 659 ppb_wdtr(&sc->lp_dev, 0x08); 660 while ((ppb_rstr(&sc->lp_dev) & 0x08) == 0) 661 if (--spin == 0) { 662 goto nend; 663 } 664 665 /* Calculate length of packet, then send that */ 666 667 count += 14; /* Ethernet header len */ 668 669 mm = m; 670 for (mm = m; mm; mm = mm->m_next) { 671 count += mm->m_len; 672 } 673 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, &sc->lp_dev)) 674 goto nend; 675 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, &sc->lp_dev)) 676 goto nend; 677 678 /* Send dummy ethernet header */ 679 for (i = 0; i < 12; i++) { 680 if (clpoutbyte(i, LPMAXSPIN1, &sc->lp_dev)) 681 goto nend; 682 chksum += i; 683 } 684 685 if (clpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev)) 686 goto nend; 687 if (clpoutbyte(0x00, LPMAXSPIN1, &sc->lp_dev)) 688 goto nend; 689 chksum += 0x08 + 0x00; /* Add into checksum */ 690 691 mm = m; 692 do { 693 cp = mtod(mm, u_char *); 694 len = mm->m_len; 695 while (len--) { 696 chksum += *cp; 697 if (clpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev)) 698 goto nend; 699 } 700 } while ((mm = mm->m_next)); 701 702 /* Send checksum */ 703 if (clpoutbyte(chksum, LPMAXSPIN2, &sc->lp_dev)) 704 goto nend; 705 706 /* Go quiescent */ 707 ppb_wdtr(&sc->lp_dev, 0); 708 709 err = 0; /* No errors */ 710 711 nend: 712 if (err) { /* if we didn't timeout... */ 713 ifp->if_oerrors++; 714 lprintf("X"); 715 } else { 716 ifp->if_opackets++; 717 ifp->if_obytes += m->m_pkthdr.len; 718 #if NBPFILTER > 0 719 if (ifp->if_bpf) 720 lptap(ifp, m); 721 #endif 722 } 723 724 m_freem(m); 725 726 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) { 727 lprintf("^"); 728 lpintr(ifp->if_unit); 729 } 730 (void) splx(s); 731 return 0; 732 } 733 734 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) { 735 lprintf("&"); 736 lpintr(ifp->if_unit); 737 } 738 739 if (lpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev)) 740 goto end; 741 if (lpoutbyte(0x00, LPMAXSPIN2, &sc->lp_dev)) 742 goto end; 743 744 mm = m; 745 do { 746 cp = mtod(mm,u_char *); 747 len = mm->m_len; 748 while (len--) 749 if (lpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev)) 750 goto end; 751 } while ((mm = mm->m_next)); 752 753 err = 0; /* no errors were encountered */ 754 755 end: 756 --cp; 757 ppb_wdtr(&sc->lp_dev, txmitl[*cp] ^ 0x17); 758 759 if (err) { /* if we didn't timeout... */ 760 ifp->if_oerrors++; 761 lprintf("X"); 762 } else { 763 ifp->if_opackets++; 764 ifp->if_obytes += m->m_pkthdr.len; 765 #if NBPFILTER > 0 766 if (ifp->if_bpf) 767 lptap(ifp, m); 768 #endif 769 } 770 771 m_freem(m); 772 773 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) { 774 lprintf("^"); 775 lpintr(ifp->if_unit); 776 } 777 778 (void) splx(s); 779 return 0; 780 } 781