if_plip.c revision 43773
1177692Smarcel/*- 2177692Smarcel * Copyright (c) 1997 Poul-Henning Kamp 3177692Smarcel * All rights reserved. 4177692Smarcel * 5177692Smarcel * Redistribution and use in source and binary forms, with or without 6177692Smarcel * modification, are permitted provided that the following conditions 7177692Smarcel * are met: 8177692Smarcel * 1. Redistributions of source code must retain the above copyright 9177692Smarcel * notice, this list of conditions and the following disclaimer. 10177692Smarcel * 2. Redistributions in binary form must reproduce the above copyright 11177692Smarcel * notice, this list of conditions and the following disclaimer in the 12177692Smarcel * 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 1.9 1999/01/30 15:35:39 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#include <dev/ppbus/nlpt.h> 103 104#include "opt_plip.h" 105 106#ifndef LPMTU /* MTU for the lp# interfaces */ 107#define LPMTU 1500 108#endif 109 110#ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 111#define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 112#endif 113 114#ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 115#define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 116#endif 117 118#ifndef LPMAXERRS /* Max errors before !RUNNING */ 119#define LPMAXERRS 100 120#endif 121 122#define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 123#define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 124#define MLPIPHDRLEN CLPIPHDRLEN 125 126#define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 127#define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 128#if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 129#define MLPIPHDRLEN LPIPHDRLEN 130#endif 131 132#define LPIPTBLSIZE 256 /* Size of octet translation table */ 133 134#define lprintf if (lptflag) printf 135 136#ifdef PLIP_DEBUG 137static int volatile lptflag = 1; 138#else 139static int volatile lptflag = 0; 140#endif 141 142struct lpt_softc { 143 unsigned short lp_unit; 144 145 struct ppb_device lp_dev; 146 147 struct ifnet sc_if; 148 u_char *sc_ifbuf; 149 int sc_iferrs; 150}; 151 152static int nlp = 0; 153#define MAXPLIP 8 /* XXX not much better! */ 154static struct lpt_softc *lpdata[MAXPLIP]; 155 156 157/* Tables for the lp# interface */ 158static u_char *txmith; 159#define txmitl (txmith+(1*LPIPTBLSIZE)) 160#define trecvh (txmith+(2*LPIPTBLSIZE)) 161#define trecvl (txmith+(3*LPIPTBLSIZE)) 162 163static u_char *ctxmith; 164#define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 165#define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 166#define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 167 168/* Functions for the lp# interface */ 169static struct ppb_device *lpprobe(struct ppb_data *); 170static int lpattach(struct ppb_device *); 171 172static int lpinittables(void); 173static int lpioctl(struct ifnet *, u_long, caddr_t); 174static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 175 struct rtentry *); 176static void lpintr(int); 177 178/* 179 * Make ourselves visible as a ppbus driver 180 */ 181 182static struct ppb_driver lpdriver = { 183 lpprobe, lpattach, "lp" 184}; 185DATA_SET(ppbdriver_set, lpdriver); 186 187 188/* 189 * lpprobe() 190 */ 191static struct ppb_device * 192lpprobe(struct ppb_data *ppb) 193{ 194 struct lpt_softc *lp; 195 196 /* if we haven't interrupts, the probe fails */ 197 if (!ppb->ppb_link->id_irq) 198 return (0); 199 200 lp = (struct lpt_softc *) malloc(sizeof(struct lpt_softc), 201 M_TEMP, M_NOWAIT); 202 if (!lp) { 203 printf("lp: cannot malloc!\n"); 204 return (0); 205 } 206 bzero(lp, sizeof(struct lpt_softc)); 207 208 lpdata[nlp] = lp; 209 210 /* 211 * lp dependent initialisation. 212 */ 213 lp->lp_unit = nlp; 214 215 if (bootverbose) 216 printf("plip: irq %d\n", ppb->ppb_link->id_irq); 217 218 /* 219 * ppbus dependent initialisation. 220 */ 221 lp->lp_dev.id_unit = lp->lp_unit; 222 lp->lp_dev.name = lpdriver.name; 223 lp->lp_dev.ppb = ppb; 224 lp->lp_dev.intr = lpintr; 225 226 /* Ok, go to next device on next probe */ 227 nlp ++; 228 229 return (&lp->lp_dev); 230} 231 232static int 233lpattach (struct ppb_device *dev) 234{ 235 int unit = dev->id_unit; 236 struct lpt_softc *sc = lpdata[unit]; 237 struct ifnet *ifp = &sc->sc_if; 238 239 /* 240 * Report ourselves 241 */ 242 printf("plip%d: <PLIP network interface> on ppbus %d\n", 243 dev->id_unit, dev->ppb->ppb_link->adapter_unit); 244 245 ifp->if_softc = sc; 246 ifp->if_name = "lp"; 247 ifp->if_unit = unit; 248 ifp->if_mtu = LPMTU; 249 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 250 ifp->if_ioctl = lpioctl; 251 ifp->if_output = lpoutput; 252 ifp->if_type = IFT_PARA; 253 ifp->if_hdrlen = 0; 254 ifp->if_addrlen = 0; 255 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 256 if_attach(ifp); 257 258#if NBPFILTER > 0 259 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 260#endif 261 262 return (1); 263} 264/* 265 * Build the translation tables for the LPIP (BSD unix) protocol. 266 * We don't want to calculate these nasties in our tight loop, so we 267 * precalculate them when we initialize. 268 */ 269static int 270lpinittables (void) 271{ 272 int i; 273 274 if (!txmith) 275 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); 276 277 if (!txmith) 278 return 1; 279 280 if (!ctxmith) 281 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); 282 283 if (!ctxmith) 284 return 1; 285 286 for (i=0; i < LPIPTBLSIZE; i++) { 287 ctxmith[i] = (i & 0xF0) >> 4; 288 ctxmitl[i] = 0x10 | (i & 0x0F); 289 ctrecvh[i] = (i & 0x78) << 1; 290 ctrecvl[i] = (i & 0x78) >> 3; 291 } 292 293 for (i=0; i < LPIPTBLSIZE; i++) { 294 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 295 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 296 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 297 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 298 } 299 300 return 0; 301} 302 303/* 304 * Process an ioctl request. 305 */ 306 307static int 308lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data) 309{ 310 struct lpt_softc *sc = lpdata[ifp->if_unit]; 311 struct ifaddr *ifa = (struct ifaddr *)data; 312 struct ifreq *ifr = (struct ifreq *)data; 313 u_char *ptr; 314 int error; 315 316 switch (cmd) { 317 318 case SIOCSIFDSTADDR: 319 case SIOCAIFADDR: 320 case SIOCSIFADDR: 321 if (ifa->ifa_addr->sa_family != AF_INET) 322 return EAFNOSUPPORT; 323 324 ifp->if_flags |= IFF_UP; 325 /* FALLTHROUGH */ 326 case SIOCSIFFLAGS: 327 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 328 329 ppb_wctr(&sc->lp_dev, 0x00); 330 ifp->if_flags &= ~IFF_RUNNING; 331 332 /* IFF_UP is not set, try to release the bus anyway */ 333 ppb_release_bus(&sc->lp_dev); 334 break; 335 } 336 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 337 338 /* XXX 339 * Should the request be interruptible? 340 */ 341 if ((error = ppb_request_bus(&sc->lp_dev, PPB_WAIT|PPB_INTR))) 342 return (error); 343 344 /* Now IFF_UP means that we own the bus */ 345 346 ppb_set_mode(&sc->lp_dev, PPB_COMPATIBLE); 347 348 if (lpinittables()) { 349 ppb_release_bus(&sc->lp_dev); 350 return ENOBUFS; 351 } 352 353 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 354 M_DEVBUF, M_WAITOK); 355 if (!sc->sc_ifbuf) { 356 ppb_release_bus(&sc->lp_dev); 357 return ENOBUFS; 358 } 359 360 ppb_wctr(&sc->lp_dev, LPC_ENA); 361 ifp->if_flags |= IFF_RUNNING; 362 } 363 break; 364 365 case SIOCSIFMTU: 366 ptr = sc->sc_ifbuf; 367 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT); 368 if (!sc->sc_ifbuf) { 369 sc->sc_ifbuf = ptr; 370 return ENOBUFS; 371 } 372 if (ptr) 373 free(ptr,M_DEVBUF); 374 sc->sc_if.if_mtu = ifr->ifr_mtu; 375 break; 376 377 case SIOCGIFMTU: 378 ifr->ifr_mtu = sc->sc_if.if_mtu; 379 break; 380 381 case SIOCADDMULTI: 382 case SIOCDELMULTI: 383 if (ifr == 0) { 384 return EAFNOSUPPORT; /* XXX */ 385 } 386 switch (ifr->ifr_addr.sa_family) { 387 388 case AF_INET: 389 break; 390 391 default: 392 return EAFNOSUPPORT; 393 } 394 break; 395 396 case SIOCGIFMEDIA: 397 /* 398 * No ifmedia support at this stage; maybe use it 399 * in future for eg. protocol selection. 400 */ 401 return EINVAL; 402 403 default: 404 lprintf("LP:ioctl(0x%lx)\n", cmd); 405 return EINVAL; 406 } 407 return 0; 408} 409 410static __inline int 411clpoutbyte (u_char byte, int spin, struct ppb_device *dev) 412{ 413 ppb_wdtr(dev, ctxmitl[byte]); 414 while (ppb_rstr(dev) & CLPIP_SHAKE) 415 if (--spin == 0) { 416 return 1; 417 } 418 ppb_wdtr(dev, ctxmith[byte]); 419 while (!(ppb_rstr(dev) & CLPIP_SHAKE)) 420 if (--spin == 0) { 421 return 1; 422 } 423 return 0; 424} 425 426static __inline int 427clpinbyte (int spin, struct ppb_device *dev) 428{ 429 u_char c, cl; 430 431 while((ppb_rstr(dev) & CLPIP_SHAKE)) 432 if(!--spin) { 433 return -1; 434 } 435 cl = ppb_rstr(dev); 436 ppb_wdtr(dev, 0x10); 437 438 while(!(ppb_rstr(dev) & CLPIP_SHAKE)) 439 if(!--spin) { 440 return -1; 441 } 442 c = ppb_rstr(dev); 443 ppb_wdtr(dev, 0x00); 444 445 return (ctrecvl[cl] | ctrecvh[c]); 446} 447 448#if NBPFILTER > 0 449static void 450lptap(struct ifnet *ifp, struct mbuf *m) 451{ 452 /* 453 * Send a packet through bpf. We need to prepend the address family 454 * as a four byte field. Cons up a dummy header to pacify bpf. This 455 * is safe because bpf will only read from the mbuf (i.e., it won't 456 * try to free it or keep a pointer to it). 457 */ 458 u_int32_t af = AF_INET; 459 struct mbuf m0; 460 461 m0.m_next = m; 462 m0.m_len = sizeof(u_int32_t); 463 m0.m_data = (char *)⁡ 464 bpf_mtap(ifp, &m0); 465} 466#endif 467 468static void 469lpintr (int unit) 470{ 471 struct lpt_softc *sc = lpdata[unit]; 472 int len, s, j; 473 u_char *bp; 474 u_char c, cl; 475 struct mbuf *top; 476 477 s = splhigh(); 478 479 if (sc->sc_if.if_flags & IFF_LINK0) { 480 481 /* Ack. the request */ 482 ppb_wdtr(&sc->lp_dev, 0x01); 483 484 /* Get the packet length */ 485 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 486 if (j == -1) 487 goto err; 488 len = j; 489 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 490 if (j == -1) 491 goto err; 492 len = len + (j << 8); 493 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 494 goto err; 495 496 bp = sc->sc_ifbuf; 497 498 while (len--) { 499 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 500 if (j == -1) { 501 goto err; 502 } 503 *bp++ = j; 504 } 505 /* Get and ignore checksum */ 506 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev); 507 if (j == -1) { 508 goto err; 509 } 510 511 len = bp - sc->sc_ifbuf; 512 if (len <= CLPIPHDRLEN) 513 goto err; 514 515 sc->sc_iferrs = 0; 516 517 if (IF_QFULL(&ipintrq)) { 518 lprintf("DROP"); 519 IF_DROP(&ipintrq); 520 goto done; 521 } 522 len -= CLPIPHDRLEN; 523 sc->sc_if.if_ipackets++; 524 sc->sc_if.if_ibytes += len; 525 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 526 if (top) { 527#if NBPFILTER > 0 528 if (sc->sc_if.if_bpf) 529 lptap(&sc->sc_if, top); 530#endif 531 IF_ENQUEUE(&ipintrq, top); 532 schednetisr(NETISR_IP); 533 } 534 goto done; 535 } 536 while ((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) { 537 len = sc->sc_if.if_mtu + LPIPHDRLEN; 538 bp = sc->sc_ifbuf; 539 while (len--) { 540 541 cl = ppb_rstr(&sc->lp_dev); 542 ppb_wdtr(&sc->lp_dev, 8); 543 544 j = LPMAXSPIN2; 545 while((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) 546 if(!--j) goto err; 547 548 c = ppb_rstr(&sc->lp_dev); 549 ppb_wdtr(&sc->lp_dev, 0); 550 551 *bp++= trecvh[cl] | trecvl[c]; 552 553 j = LPMAXSPIN2; 554 while (!((cl=ppb_rstr(&sc->lp_dev)) & LPIP_SHAKE)) { 555 if (cl != c && 556 (((cl = ppb_rstr(&sc->lp_dev)) ^ 0xb8) & 0xf8) == 557 (c & 0xf8)) 558 goto end; 559 if (!--j) goto err; 560 } 561 } 562 563 end: 564 len = bp - sc->sc_ifbuf; 565 if (len <= LPIPHDRLEN) 566 goto err; 567 568 sc->sc_iferrs = 0; 569 570 if (IF_QFULL(&ipintrq)) { 571 lprintf("DROP"); 572 IF_DROP(&ipintrq); 573 goto done; 574 } 575 len -= LPIPHDRLEN; 576 sc->sc_if.if_ipackets++; 577 sc->sc_if.if_ibytes += len; 578 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 579 if (top) { 580#if NBPFILTER > 0 581 if (sc->sc_if.if_bpf) 582 lptap(&sc->sc_if, top); 583#endif 584 IF_ENQUEUE(&ipintrq, top); 585 schednetisr(NETISR_IP); 586 } 587 } 588 goto done; 589 590 err: 591 ppb_wdtr(&sc->lp_dev, 0); 592 lprintf("R"); 593 sc->sc_if.if_ierrors++; 594 sc->sc_iferrs++; 595 596 /* 597 * We are not able to send receive anything for now, 598 * so stop wasting our time 599 */ 600 if (sc->sc_iferrs > LPMAXERRS) { 601 printf("lp%d: Too many errors, Going off-line.\n", unit); 602 ppb_wctr(&sc->lp_dev, 0x00); 603 sc->sc_if.if_flags &= ~IFF_RUNNING; 604 sc->sc_iferrs=0; 605 } 606 607 done: 608 splx(s); 609 return; 610} 611 612static __inline int 613lpoutbyte (u_char byte, int spin, struct ppb_device *dev) 614{ 615 ppb_wdtr(dev, txmith[byte]); 616 while (!(ppb_rstr(dev) & LPIP_SHAKE)) 617 if (--spin == 0) 618 return 1; 619 ppb_wdtr(dev, txmitl[byte]); 620 while (ppb_rstr(dev) & LPIP_SHAKE) 621 if (--spin == 0) 622 return 1; 623 return 0; 624} 625 626static int 627lpoutput (struct ifnet *ifp, struct mbuf *m, 628 struct sockaddr *dst, struct rtentry *rt) 629{ 630 struct lpt_softc *sc = lpdata[ifp->if_unit]; 631 int s, err; 632 struct mbuf *mm; 633 u_char *cp = "\0\0"; 634 u_char chksum = 0; 635 int count = 0; 636 int i, len, spin; 637 638 /* We need a sensible value if we abort */ 639 cp++; 640 ifp->if_flags |= IFF_RUNNING; 641 642 err = 1; /* assume we're aborting because of an error */ 643 644 s = splhigh(); 645 646 /* Suspend (on laptops) or receive-errors might have taken us offline */ 647 ppb_wctr(&sc->lp_dev, LPC_ENA); 648 649 if (ifp->if_flags & IFF_LINK0) { 650 651 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) { 652 lprintf("&"); 653 lpintr(ifp->if_unit); 654 } 655 656 /* Alert other end to pending packet */ 657 spin = LPMAXSPIN1; 658 ppb_wdtr(&sc->lp_dev, 0x08); 659 while ((ppb_rstr(&sc->lp_dev) & 0x08) == 0) 660 if (--spin == 0) { 661 goto nend; 662 } 663 664 /* Calculate length of packet, then send that */ 665 666 count += 14; /* Ethernet header len */ 667 668 mm = m; 669 for (mm = m; mm; mm = mm->m_next) { 670 count += mm->m_len; 671 } 672 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, &sc->lp_dev)) 673 goto nend; 674 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, &sc->lp_dev)) 675 goto nend; 676 677 /* Send dummy ethernet header */ 678 for (i = 0; i < 12; i++) { 679 if (clpoutbyte(i, LPMAXSPIN1, &sc->lp_dev)) 680 goto nend; 681 chksum += i; 682 } 683 684 if (clpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev)) 685 goto nend; 686 if (clpoutbyte(0x00, LPMAXSPIN1, &sc->lp_dev)) 687 goto nend; 688 chksum += 0x08 + 0x00; /* Add into checksum */ 689 690 mm = m; 691 do { 692 cp = mtod(mm, u_char *); 693 len = mm->m_len; 694 while (len--) { 695 chksum += *cp; 696 if (clpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev)) 697 goto nend; 698 } 699 } while ((mm = mm->m_next)); 700 701 /* Send checksum */ 702 if (clpoutbyte(chksum, LPMAXSPIN2, &sc->lp_dev)) 703 goto nend; 704 705 /* Go quiescent */ 706 ppb_wdtr(&sc->lp_dev, 0); 707 708 err = 0; /* No errors */ 709 710 nend: 711 if (err) { /* if we didn't timeout... */ 712 ifp->if_oerrors++; 713 lprintf("X"); 714 } else { 715 ifp->if_opackets++; 716 ifp->if_obytes += m->m_pkthdr.len; 717#if NBPFILTER > 0 718 if (ifp->if_bpf) 719 lptap(ifp, m); 720#endif 721 } 722 723 m_freem(m); 724 725 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) { 726 lprintf("^"); 727 lpintr(ifp->if_unit); 728 } 729 (void) splx(s); 730 return 0; 731 } 732 733 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) { 734 lprintf("&"); 735 lpintr(ifp->if_unit); 736 } 737 738 if (lpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev)) 739 goto end; 740 if (lpoutbyte(0x00, LPMAXSPIN2, &sc->lp_dev)) 741 goto end; 742 743 mm = m; 744 do { 745 cp = mtod(mm,u_char *); 746 len = mm->m_len; 747 while (len--) 748 if (lpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev)) 749 goto end; 750 } while ((mm = mm->m_next)); 751 752 err = 0; /* no errors were encountered */ 753 754 end: 755 --cp; 756 ppb_wdtr(&sc->lp_dev, txmitl[*cp] ^ 0x17); 757 758 if (err) { /* if we didn't timeout... */ 759 ifp->if_oerrors++; 760 lprintf("X"); 761 } else { 762 ifp->if_opackets++; 763 ifp->if_obytes += m->m_pkthdr.len; 764#if NBPFILTER > 0 765 if (ifp->if_bpf) 766 lptap(ifp, m); 767#endif 768 } 769 770 m_freem(m); 771 772 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) { 773 lprintf("^"); 774 lpintr(ifp->if_unit); 775 } 776 777 (void) splx(s); 778 return 0; 779} 780