1 /* $NetBSD: if_plip.c,v 1.25 2014/06/05 23:48:16 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 Poul-Henning Kamp 5 * Copyright (c) 2003, 2004 Gary Thorpe <gathorpe@users.sourceforge.net> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 30 * FreeBSD: src/sys/dev/ppbus/if_plip.c,v 1.19.2.1 2000/05/24 00:20:57 n_hibma Exp 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: if_plip.c,v 1.25 2014/06/05 23:48:16 rmind Exp $"); 35 36 /* 37 * Parallel port TCP/IP interfaces added. I looked at the driver from 38 * MACH but this is a complete rewrite, and btw. incompatible, and it 39 * should perform better too. I have never run the MACH driver though. 40 * 41 * This driver sends two bytes (0x08, 0x00) in front of each packet, 42 * to allow us to distinguish another format later. 43 * 44 * Now added an Linux/Crynwr compatibility mode which is enabled using 45 * IF_LINK0 - Tim Wilkinson. 46 * 47 * TODO: 48 * Make HDLC/PPP mode, use IF_LLC1 to enable. 49 * 50 * Connect the two computers using a Laplink parallel cable to use this 51 * feature: 52 * 53 * +----------------------------------------+ 54 * |A-name A-End B-End Descr. Port/Bit | 55 * +----------------------------------------+ 56 * |DATA0 2 15 Data 0/0x01 | 57 * |-ERROR 15 2 1/0x08 | 58 * +----------------------------------------+ 59 * |DATA1 3 13 Data 0/0x02 | 60 * |+SLCT 13 3 1/0x10 | 61 * +----------------------------------------+ 62 * |DATA2 4 12 Data 0/0x04 | 63 * |+PE 12 4 1/0x20 | 64 * +----------------------------------------+ 65 * |DATA3 5 10 Strobe 0/0x08 | 66 * |-ACK 10 5 1/0x40 | 67 * +----------------------------------------+ 68 * |DATA4 6 11 Data 0/0x10 | 69 * |BUSY 11 6 1/~0x80 | 70 * +----------------------------------------+ 71 * |GND 18-25 18-25 GND - | 72 * +----------------------------------------+ 73 * 74 * Expect transfer-rates up to 75 kbyte/sec. 75 * 76 * If GCC could correctly grok 77 * register int port __asm("edx") 78 * the code would be cleaner 79 * 80 * Poul-Henning Kamp <phk@freebsd.org> 81 */ 82 83 /* 84 * Update for ppbus, PLIP support only - Nicolas Souchu 85 */ 86 87 #include "opt_inet.h" 88 #include "opt_plip.h" 89 90 #include <sys/systm.h> 91 #include <sys/param.h> 92 #include <sys/proc.h> 93 #include <sys/types.h> 94 #include <sys/device.h> 95 #include <sys/ioctl.h> 96 #include <sys/malloc.h> 97 #include <sys/mbuf.h> 98 99 #include <net/if.h> 100 #include <net/if_types.h> 101 #include <net/netisr.h> 102 103 #include <sys/time.h> 104 #include <net/bpf.h> 105 106 #ifdef INET 107 #include <netinet/in_var.h> 108 /* #include <netinet/in.h> */ 109 #else 110 #error Cannot config lp/plip without inet 111 #endif 112 113 #include <dev/ppbus/ppbus_base.h> 114 #include <dev/ppbus/ppbus_device.h> 115 #include <dev/ppbus/ppbus_io.h> 116 #include <dev/ppbus/ppbus_var.h> 117 118 #include <machine/types.h> 119 #include <sys/intr.h> 120 121 #ifndef LPMTU /* MTU for the lp# interfaces */ 122 #define LPMTU 1500 123 #endif 124 125 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 126 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 127 #endif 128 129 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 130 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 131 #endif 132 133 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 134 #define LPMAXERRS 100 135 #endif 136 137 #ifndef LPMAXRTRY 138 #define LPMAXRTRY 100 /* If channel busy, retry LPMAXRTRY 139 consecutive times */ 140 #endif 141 142 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 143 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 144 #define MLPIPHDRLEN CLPIPHDRLEN 145 146 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 147 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 148 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 149 #define MLPIPHDRLEN LPIPHDRLEN 150 #endif 151 152 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 153 154 #define LP_PRINTF if (lpflag) printf 155 156 #ifdef PLIP_DEBUG 157 static int volatile lpflag = 1; 158 #else 159 static int volatile lpflag = 0; 160 #endif 161 162 /* Tx/Rsv tables for the lp interface */ 163 static u_char *txmith; 164 #define txmitl (txmith+(1*LPIPTBLSIZE)) 165 #define trecvh (txmith+(2*LPIPTBLSIZE)) 166 #define trecvl (txmith+(3*LPIPTBLSIZE)) 167 static u_char *ctxmith; 168 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 169 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 170 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 171 static uint16_t lp_count = 0; 172 173 /* Autoconf functions */ 174 static int lp_probe(device_t, cfdata_t, void *); 175 static void lp_attach(device_t, device_t, void *); 176 static int lp_detach(device_t, int); 177 178 /* Soft config data */ 179 struct lp_softc { 180 struct ppbus_device_softc ppbus_dev; 181 struct ifnet sc_if; 182 u_char *sc_ifbuf; 183 unsigned short sc_iferrs; 184 unsigned short sc_xmit_rtry; 185 u_int8_t sc_dev_ok; /* Zero means ok */ 186 }; 187 188 /* Autoconf structure */ 189 CFATTACH_DECL_NEW(plip, sizeof(struct lp_softc), lp_probe, lp_attach, lp_detach, 190 NULL); 191 192 /* Functions for the lp interface */ 193 static void lpinittables(void); 194 static void lpfreetables(void); 195 static int lpioctl(struct ifnet *, u_long, void *); 196 static int lpoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 197 struct rtentry *); 198 static void lpstart(struct ifnet *); 199 static void lp_intr(void *); 200 201 202 static int 203 lp_probe(device_t parent, cfdata_t match, void *aux) 204 { 205 struct ppbus_attach_args * args = aux; 206 207 /* Fail if ppbus is not interrupt capable */ 208 if(args->capabilities & PPBUS_HAS_INTR) 209 return 1; 210 211 printf("%s(%s): not an interrupt-driven port.\n", __func__, 212 device_xname(parent)); 213 return 0; 214 } 215 216 static void 217 lp_attach(device_t parent, device_t self, void *aux) 218 { 219 struct lp_softc * lp = device_private(self); 220 struct ifnet * ifp = &lp->sc_if; 221 222 lp->ppbus_dev.sc_dev = self; 223 lp->sc_dev_ok = 0; 224 lp->sc_ifbuf = NULL; 225 lp->sc_iferrs = 0; 226 lp->sc_xmit_rtry = 0; 227 228 ifp->if_softc = lp; 229 strlcpy(ifp->if_xname, device_xname(self), IFNAMSIZ); 230 ifp->if_mtu = LPMTU; 231 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 232 ifp->if_ioctl = lpioctl; 233 ifp->if_output = lpoutput; 234 ifp->if_start = lpstart; 235 ifp->if_type = IFT_PARA; 236 ifp->if_hdrlen = 0; 237 ifp->if_addrlen = 0; 238 ifp->if_dlt = DLT_NULL; 239 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 240 IFQ_SET_READY(&ifp->if_snd); 241 if_attach(ifp); 242 if_alloc_sadl(ifp); 243 244 bpf_attach(ifp, DLT_NULL, sizeof(u_int32_t)); 245 246 if(lp_count++ == 0) 247 lpinittables(); 248 printf("\n"); 249 } 250 251 static int 252 lp_detach(device_t self, int flags) 253 { 254 int error = 0; 255 struct lp_softc * lp = device_private(self); 256 device_t ppbus = device_parent(self); 257 258 if(lp->sc_dev_ok) { 259 if(!(flags & DETACH_QUIET)) 260 LP_PRINTF("%s(%s): device not properly attached! " 261 "Skipping detach....\n", __func__, 262 device_xname(self)); 263 return error; 264 } 265 266 /* If interface is up, bring it down and release ppbus */ 267 if(lp->sc_if.if_flags & IFF_RUNNING) { 268 ppbus_wctr(ppbus, 0x00); 269 if_detach(&lp->sc_if); 270 error = ppbus_remove_handler(ppbus, lp_intr); 271 if(error) { 272 if(!(flags & DETACH_QUIET)) 273 LP_PRINTF("%s(%s): unable to remove interrupt " 274 "callback.\n", __func__, 275 device_xname(self)); 276 if(!(flags & DETACH_FORCE)) 277 return error; 278 } 279 error = ppbus_release_bus(ppbus, self, 0, 0); 280 if(error) { 281 if(!(flags & DETACH_QUIET)) 282 LP_PRINTF("%s(%s): error releasing bus %s.\n", 283 __func__, device_xname(self), 284 device_xname(ppbus)); 285 if(!(flags & DETACH_FORCE)) 286 return error; 287 } 288 } 289 290 if(lp->sc_ifbuf) 291 free(lp->sc_ifbuf, M_DEVBUF); 292 293 if(--lp_count == 0) 294 lpfreetables(); 295 return error; 296 } 297 298 /* 299 * Build the translation tables for the LPIP (BSD unix) protocol. 300 * We don't want to calculate these nasties in our tight loop, so we 301 * precalculate them when we initialize. 302 */ 303 static void 304 lpinittables (void) 305 { 306 int i; 307 308 if (!txmith) 309 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 310 311 if (!ctxmith) 312 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 313 314 for(i = 0; i < LPIPTBLSIZE; i++) { 315 ctxmith[i] = (i & 0xF0) >> 4; 316 ctxmitl[i] = 0x10 | (i & 0x0F); 317 ctrecvh[i] = (i & 0x78) << 1; 318 ctrecvl[i] = (i & 0x78) >> 3; 319 } 320 321 for(i = 0; i < LPIPTBLSIZE; i++) { 322 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 323 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 324 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 325 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 326 } 327 } 328 329 /* Free translation tables */ 330 static void 331 lpfreetables (void) 332 { 333 if (txmith) 334 free(txmith, M_DEVBUF); 335 if (ctxmith) 336 free(ctxmith, M_DEVBUF); 337 txmith = ctxmith = NULL; 338 } 339 340 341 /* Process an ioctl request. */ 342 static int 343 lpioctl(struct ifnet *ifp, u_long cmd, void *data) 344 { 345 struct lp_softc * sc = ifp->if_softc; 346 device_t dev = sc->ppbus_dev.sc_dev; 347 device_t ppbus = device_parent(dev); 348 struct ifaddr * ifa = (struct ifaddr *)data; 349 struct ifreq * ifr = (struct ifreq *)data; 350 u_char * ptr; 351 int error, s; 352 353 error = 0; 354 s = splnet(); 355 356 if(sc->sc_dev_ok) { 357 LP_PRINTF("%s(%s): device not properly attached!", __func__, 358 device_xname(dev)); 359 error = ENODEV; 360 goto end; 361 } 362 363 switch (cmd) { 364 365 case SIOCSIFDSTADDR: 366 if (ifa->ifa_addr->sa_family != AF_INET) 367 error = EAFNOSUPPORT; 368 break; 369 370 case SIOCINITIFADDR: 371 if (ifa->ifa_addr->sa_family != AF_INET) { 372 error = EAFNOSUPPORT; 373 break; 374 } 375 ifp->if_flags |= IFF_UP; 376 /* FALLTHROUGH */ 377 case SIOCSIFFLAGS: 378 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 379 break; 380 if((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 381 if((error = ppbus_request_bus(ppbus, dev, 0, 0))) 382 break; 383 error = ppbus_set_mode(ppbus, PPBUS_COMPATIBLE, 0); 384 if(error) 385 break; 386 387 error = ppbus_add_handler(ppbus, lp_intr, dev); 388 if(error) { 389 LP_PRINTF("%s(%s): unable to register interrupt" 390 " callback.\n", __func__, 391 device_xname(dev)); 392 ppbus_release_bus(ppbus, dev, 0, 0); 393 break; 394 } 395 396 /* Allocate a buffer if necessary */ 397 if(sc->sc_ifbuf == NULL) { 398 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + 399 MLPIPHDRLEN, M_DEVBUF, M_NOWAIT); 400 if (!sc->sc_ifbuf) { 401 error = ENOBUFS; 402 ppbus_release_bus(ppbus, dev, 0, 0); 403 break; 404 } 405 } 406 407 ppbus_wctr(ppbus, IRQENABLE); 408 ifp->if_flags |= IFF_RUNNING; 409 } 410 if((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 411 ppbus_remove_handler(ppbus, lp_intr); 412 error = ppbus_release_bus(ppbus, dev, 0, 0); 413 ifp->if_flags &= ~IFF_RUNNING; 414 } 415 /* Go quiescent */ 416 ppbus_wdtr(ppbus, 0); 417 break; 418 419 case SIOCSIFMTU: 420 if(sc->sc_if.if_mtu == ifr->ifr_mtu) 421 break; 422 ptr = sc->sc_ifbuf; 423 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, 424 M_NOWAIT); 425 if (!sc->sc_ifbuf) { 426 sc->sc_ifbuf = ptr; 427 error = ENOBUFS; 428 break; 429 } 430 if(ptr) 431 free(ptr,M_DEVBUF); 432 /*FALLTHROUGH*/ 433 case SIOCGIFMTU: 434 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 435 error = 0; 436 break; 437 438 case SIOCADDMULTI: 439 case SIOCDELMULTI: 440 if (ifr == NULL) { 441 error = EAFNOSUPPORT; /* XXX */ 442 break; 443 } 444 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 445 case AF_INET: 446 break; 447 default: 448 return EAFNOSUPPORT; 449 } 450 break; 451 452 case SIOCGIFMEDIA: 453 /* 454 * No ifmedia support at this stage; maybe use it 455 * in future for eg. protocol selection. 456 */ 457 default: 458 LP_PRINTF("LP:ioctl(0x%lx)\n", cmd); 459 error = ifioctl_common(ifp, cmd, data); 460 } 461 462 end: 463 splx(s); 464 return error; 465 } 466 467 static inline int 468 clpoutbyte (u_char byte, int spin, device_t ppbus) 469 { 470 int s = spin; 471 ppbus_wdtr(ppbus, ctxmitl[byte]); 472 while (ppbus_rstr(ppbus) & CLPIP_SHAKE) { 473 if (--s == 0) { 474 return 1; 475 } 476 } 477 s = spin; 478 ppbus_wdtr(ppbus, ctxmith[byte]); 479 while (!(ppbus_rstr(ppbus) & CLPIP_SHAKE)) { 480 if (--s == 0) { 481 return 1; 482 } 483 } 484 return 0; 485 } 486 487 static inline int 488 clpinbyte (int spin, device_t ppbus) 489 { 490 u_char c, cl; 491 int s = spin; 492 493 while(ppbus_rstr(ppbus) & CLPIP_SHAKE) { 494 if(!--s) { 495 return -1; 496 } 497 } 498 cl = ppbus_rstr(ppbus); 499 ppbus_wdtr(ppbus, 0x10); 500 501 s = spin; 502 while(!(ppbus_rstr(ppbus) & CLPIP_SHAKE)) { 503 if(!--s) { 504 return -1; 505 } 506 } 507 c = ppbus_rstr(ppbus); 508 ppbus_wdtr(ppbus, 0x00); 509 510 return (ctrecvl[cl] | ctrecvh[c]); 511 } 512 513 static void 514 lptap(struct ifnet *ifp, struct mbuf *m) 515 { 516 /* 517 * Send a packet through bpf. We need to prepend the address family 518 * as a four byte field. Cons up a dummy header to pacify bpf. This 519 * is safe because bpf will only read from the mbuf (i.e., it won't 520 * try to free it or keep a pointer to it). 521 */ 522 u_int32_t af = AF_INET; 523 struct mbuf m0; 524 525 m0.m_next = m; 526 m0.m_len = sizeof(u_int32_t); 527 m0.m_data = (char *)⁡ 528 bpf_mtap(ifp, &m0); 529 } 530 531 /* Soft interrupt handler called by hardware interrupt handler */ 532 static void 533 lp_intr (void *arg) 534 { 535 device_t dev = (device_t)arg; 536 device_t ppbus = device_parent(dev); 537 struct lp_softc * sc = device_private(dev); 538 struct ifnet * ifp = &sc->sc_if; 539 struct mbuf *top; 540 int len, s, j; 541 u_char *bp; 542 u_char c, cl; 543 544 s = splnet(); 545 546 /* Do nothing if device not properly attached */ 547 if(sc->sc_dev_ok) { 548 LP_PRINTF("%s(%s): device not properly attached!", __func__, 549 device_xname(dev)); 550 goto done; 551 } 552 553 /* Do nothing if interface is not up */ 554 if((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 555 goto done; 556 557 /* If other side is no longer transmitting, do nothing */ 558 if(!(ppbus_rstr(ppbus) & LPIP_SHAKE)) 559 goto done; 560 561 /* Disable interrupts until we finish */ 562 ppbus_wctr(ppbus, ~IRQENABLE); 563 564 top = NULL; 565 bp = sc->sc_ifbuf; 566 /* Linux/crynwyr protocol receiving */ 567 if(ifp->if_flags & IFF_LINK0) { 568 /* Ack. the request */ 569 ppbus_wdtr(ppbus, 0x01); 570 571 /* Get the packet length */ 572 j = clpinbyte(LPMAXSPIN2, ppbus); 573 if(j == -1) 574 goto err; 575 len = j; 576 j = clpinbyte(LPMAXSPIN2, ppbus); 577 if(j == -1) 578 goto err; 579 len = len + (j << 8); 580 if(len > ifp->if_mtu + MLPIPHDRLEN) 581 goto err; 582 583 while(len--) { 584 j = clpinbyte(LPMAXSPIN2, ppbus); 585 if (j == -1) { 586 goto err; 587 } 588 *bp++ = j; 589 } 590 /* Get and ignore checksum */ 591 j = clpinbyte(LPMAXSPIN2, ppbus); 592 if(j == -1) { 593 goto err; 594 } 595 596 /* Return to idle state */ 597 ppbus_wdtr(ppbus, 0); 598 len = bp - sc->sc_ifbuf; 599 if (len <= CLPIPHDRLEN) 600 goto err; 601 len -= CLPIPHDRLEN; 602 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, ifp, NULL); 603 } 604 /* FreeBSD protocol receiving */ 605 else { 606 len = ifp->if_mtu + LPIPHDRLEN; 607 while(len--) { 608 cl = ppbus_rstr(ppbus); 609 ppbus_wdtr(ppbus, 0x08); 610 611 j = LPMAXSPIN2; 612 while((ppbus_rstr(ppbus) & LPIP_SHAKE)) { 613 if(!--j) goto err; 614 } 615 616 c = ppbus_rstr(ppbus); 617 ppbus_wdtr(ppbus, 0); 618 619 *bp++= trecvh[cl] | trecvl[c]; 620 621 j = LPMAXSPIN2; 622 while(!((cl=ppbus_rstr(ppbus)) & LPIP_SHAKE)) { 623 if(cl != c && 624 (((cl = ppbus_rstr(ppbus)) ^ 0xb8) & 625 0xf8) == (c & 0xf8)) 626 goto end; 627 if(!--j) goto err; 628 } 629 } 630 631 end: 632 len = bp - sc->sc_ifbuf; 633 if(len <= LPIPHDRLEN) 634 goto err; 635 len -= LPIPHDRLEN; 636 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, ifp, NULL); 637 } 638 639 if (top == NULL) { 640 ifp->if_iqdrops++; 641 goto err; 642 } 643 if (ifp->if_bpf) { 644 lptap(ifp, top); 645 } 646 if (__predict_false(!pktq_enqueue(ip_pktq, top, 0))) { 647 ifp->if_iqdrops++; 648 m_freem(top); 649 goto err; 650 } 651 ifp->if_ipackets++; 652 ifp->if_ibytes += len; 653 sc->sc_iferrs = 0; 654 655 goto done; 656 657 err: 658 /* Return to idle state */ 659 ppbus_wdtr(ppbus, 0); 660 ifp->if_ierrors++; 661 sc->sc_iferrs++; 662 LP_PRINTF("R"); 663 /* Disable interface if there are too many errors */ 664 if(sc->sc_iferrs > LPMAXERRS) { 665 aprint_error_dev(dev, "Too many consecutive errors, going off-line.\n"); 666 ppbus_wctr(ppbus, ~IRQENABLE); 667 if_down(ifp); 668 sc->sc_iferrs = 0; 669 } 670 671 done: 672 /* Re-enable interrupts */ 673 ppbus_wctr(ppbus, IRQENABLE); 674 /* If interface is not active, send some packets */ 675 if((ifp->if_flags & IFF_OACTIVE) == 0) 676 lpstart(ifp); 677 splx(s); 678 return; 679 } 680 681 static inline int 682 lpoutbyte(u_char byte, int spin, device_t ppbus) 683 { 684 int s = spin; 685 ppbus_wdtr(ppbus, txmith[byte]); 686 while(!(ppbus_rstr(ppbus) & LPIP_SHAKE)) { 687 if(--s == 0) 688 return 1; 689 } 690 s = spin; 691 ppbus_wdtr(ppbus, txmitl[byte]); 692 while(ppbus_rstr(ppbus) & LPIP_SHAKE) { 693 if(--s == 0) 694 return 1; 695 } 696 return 0; 697 } 698 699 /* Queue a packet for delivery */ 700 static int 701 lpoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 702 struct rtentry *rt) 703 { 704 struct lp_softc * sc = ifp->if_softc; 705 device_t dev = sc->ppbus_dev.sc_dev; 706 device_t ppbus = device_parent(dev); 707 ALTQ_DECL(struct altq_pktattr pktattr;) 708 int err; 709 int s; 710 711 s = splnet(); 712 713 if(sc->sc_dev_ok) { 714 LP_PRINTF("%s(%s): device not properly attached!", __func__, 715 device_xname(dev)); 716 err = ENODEV; 717 goto endoutput; 718 } 719 720 if((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 721 err = ENETDOWN; 722 goto endoutput; 723 } 724 725 /* Only support INET */ 726 if(dst->sa_family != AF_INET) { 727 LP_PRINTF("%s: af%d not supported\n", ifp->if_xname, 728 dst->sa_family); 729 ifp->if_noproto++; 730 err = EAFNOSUPPORT; 731 goto endoutput; 732 } 733 734 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 735 IFQ_ENQUEUE(&ifp->if_snd, m, NULL, err); 736 if(err == 0) { 737 if((ifp->if_flags & IFF_OACTIVE) == 0) 738 lpstart(ifp); 739 } 740 else { 741 ifp->if_oerrors++; 742 sc->sc_iferrs++; 743 LP_PRINTF("Q"); 744 745 /* Disable interface if there are too many errors */ 746 if(sc->sc_iferrs > LPMAXERRS) { 747 aprint_error_dev(dev, "Too many errors, going off-line.\n"); 748 ppbus_wctr(ppbus, ~IRQENABLE); 749 if_down(ifp); 750 sc->sc_iferrs = 0; 751 } 752 } 753 754 endoutput: 755 if((err != 0) && (err != ENOBUFS)) 756 m_freem(m); 757 splx(s); 758 return err; 759 } 760 761 /* Send routine: send packets over PLIP cable. Call at splnet(). */ 762 void 763 lpstart(struct ifnet * ifp) 764 { 765 struct lp_softc * lp = ifp->if_softc; 766 device_t dev = lp->ppbus_dev.sc_dev; 767 device_t ppbus = device_parent(dev); 768 struct mbuf * mm; 769 struct mbuf * m; 770 u_char * cp; 771 int err, i, len, spin, count; 772 u_char str, chksum; 773 774 if(lp->sc_dev_ok) { 775 LP_PRINTF("%s(%s): device not properly attached!", __func__, 776 device_xname(dev)); 777 return; 778 } 779 780 if((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 781 return; 782 } 783 784 ifp->if_flags |= IFF_OACTIVE; 785 786 /* Go quiescent */ 787 ppbus_wdtr(ppbus, 0); 788 789 /* Output loop */ 790 for(;;) { 791 /* Check if there are packets to send */ 792 if(IFQ_IS_EMPTY(&ifp->if_snd)) { 793 goto final; 794 } 795 /* Try to send a packet, dequeue it later if successful */ 796 IFQ_POLL(&ifp->if_snd, m); 797 if(m == NULL) 798 goto final; 799 800 str = ppbus_rstr(ppbus); 801 /* Wait until other side is not transmitting */ 802 if((str & LPIP_SHAKE) || 803 ((ifp->if_flags & IFF_LINK0) && !(str & CLPIP_SHAKE))) { 804 LP_PRINTF("&"); 805 if(++lp->sc_xmit_rtry > LPMAXRTRY) { 806 aprint_error_dev(dev, "Too many retries while channel " 807 "busy, going off-line.\n"); 808 ppbus_wctr(ppbus, ~IRQENABLE); 809 if_down(ifp); 810 lp->sc_xmit_rtry = 0; 811 } 812 goto final; 813 } 814 lp->sc_xmit_rtry = 0; 815 816 /* Disable interrupt generation */ 817 ppbus_wctr(ppbus, ~IRQENABLE); 818 819 err = 1; 820 821 /* Output packet for Linux/crynwyr compatible protocol */ 822 if(ifp->if_flags & IFF_LINK0) { 823 /* Calculate packet length */ 824 count = 14; /* Ethernet header len */ 825 for(mm = m; mm; mm = mm->m_next) { 826 count += mm->m_len; 827 } 828 829 /* Alert other end to pending packet */ 830 spin = LPMAXSPIN1; 831 ppbus_wdtr(ppbus, 0x08); 832 while((ppbus_rstr(ppbus) & 0x08) == 0) { 833 if (--spin == 0) { 834 goto nend; 835 } 836 } 837 838 if(clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 839 goto nend; 840 if(clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 841 goto nend; 842 843 /* Send dummy ethernet header */ 844 chksum = 0; 845 for(i = 0; i < 12; i++) { 846 if(clpoutbyte(i, LPMAXSPIN1, ppbus)) 847 goto nend; 848 chksum += i; 849 } 850 851 if(clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 852 goto nend; 853 if(clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 854 goto nend; 855 chksum += 0x08 + 0x00; /* Add into checksum */ 856 857 mm = m; 858 do { 859 cp = mtod(mm, u_char *); 860 len = mm->m_len; 861 while(len--) { 862 if(clpoutbyte(*cp, LPMAXSPIN2, ppbus)) 863 goto nend; 864 chksum += *cp++; 865 } 866 } while ((mm = mm->m_next)); 867 868 /* Send checksum */ 869 if(clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 870 goto nend; 871 872 /* No errors */ 873 err = 0; 874 /* Go quiescent */ 875 ppbus_wdtr(ppbus, 0); 876 } 877 /* Output packet for FreeBSD compatible protocol */ 878 else { 879 /* We need a sensible value if we abort */ 880 cp = NULL; 881 882 if(lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 883 goto end; 884 if(lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 885 goto end; 886 887 mm = m; 888 do { 889 cp = mtod(mm,u_char *); 890 len = mm->m_len; 891 while(len--) 892 if(lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 893 goto end; 894 } while ((mm = mm->m_next)); 895 896 /* no errors were encountered */ 897 err = 0; 898 899 end: 900 if(cp) 901 ppbus_wdtr(ppbus, txmitl[*(--cp)] ^ 0x17); 902 else 903 ppbus_wdtr(ppbus, txmitl['\0'] ^ 0x17); 904 } 905 906 nend: 907 /* Re-enable interrupt generation */ 908 ppbus_wctr(ppbus, IRQENABLE); 909 910 if(err) { 911 /* Go quiescent */ 912 ppbus_wdtr(ppbus, 0); 913 914 ifp->if_oerrors++; 915 lp->sc_iferrs++; 916 LP_PRINTF("X"); 917 918 /* Disable interface if there are too many errors */ 919 if(lp->sc_iferrs > LPMAXERRS) { 920 aprint_error_dev(dev, "Too many errors, going off-line.\n"); 921 ppbus_wctr(ppbus, ~IRQENABLE); 922 if_down(ifp); 923 lp->sc_iferrs = 0; 924 goto final; 925 } 926 } 927 else { 928 /* Dequeue packet on success */ 929 IFQ_DEQUEUE(&ifp->if_snd, m); 930 if(ifp->if_bpf) 931 lptap(ifp, m); 932 ifp->if_opackets++; 933 ifp->if_obytes += m->m_pkthdr.len; 934 m_freem(m); 935 } 936 } 937 938 final: 939 ifp->if_flags &= ~IFF_OACTIVE; 940 return; 941 } 942