1 /* $NetBSD: if_plip.c,v 1.36 2020/02/04 20:46:51 jdolecek 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 1.36 2020/02/04 20:46:51 jdolecek 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 a 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 const 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 (cmd == SIOCSIFFLAGS) { 379 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 380 break; 381 } 382 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 383 if ((error = ppbus_request_bus(ppbus, dev, 0, 0))) 384 break; 385 error = ppbus_set_mode(ppbus, PPBUS_COMPATIBLE, 0); 386 if (error) 387 break; 388 389 error = ppbus_add_handler(ppbus, lp_intr, dev); 390 if (error) { 391 LP_PRINTF("%s(%s): unable to register interrupt" 392 " callback.\n", __func__, 393 device_xname(dev)); 394 ppbus_release_bus(ppbus, dev, 0, 0); 395 break; 396 } 397 398 /* Allocate a buffer if necessary */ 399 if (sc->sc_ifbuf == NULL) { 400 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + 401 MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 402 } 403 404 ppbus_wctr(ppbus, IRQENABLE); 405 ifp->if_flags |= IFF_RUNNING; 406 } 407 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 408 ppbus_remove_handler(ppbus, lp_intr); 409 error = ppbus_release_bus(ppbus, dev, 0, 0); 410 ifp->if_flags &= ~IFF_RUNNING; 411 } 412 /* Go quiescent */ 413 ppbus_wdtr(ppbus, 0); 414 break; 415 416 case SIOCSIFMTU: 417 if (sc->sc_if.if_mtu == ifr->ifr_mtu) 418 break; 419 ptr = sc->sc_ifbuf; 420 sc->sc_ifbuf = malloc(ifr->ifr_mtu + MLPIPHDRLEN, M_DEVBUF, 421 M_WAITOK); 422 if (ptr) 423 free(ptr,M_DEVBUF); 424 /*FALLTHROUGH*/ 425 case SIOCGIFMTU: 426 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 427 error = 0; 428 break; 429 430 case SIOCADDMULTI: 431 case SIOCDELMULTI: 432 if (ifr == NULL) { 433 error = EAFNOSUPPORT; /* XXX */ 434 break; 435 } 436 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 437 case AF_INET: 438 break; 439 default: 440 splx(s); 441 return EAFNOSUPPORT; 442 } 443 break; 444 445 case SIOCGIFMEDIA: 446 /* 447 * No ifmedia support at this stage; maybe use it 448 * in future for eg. protocol selection. 449 */ 450 default: 451 LP_PRINTF("LP:ioctl(0x%lx)\n", cmd); 452 error = ifioctl_common(ifp, cmd, data); 453 } 454 455 end: 456 splx(s); 457 return error; 458 } 459 460 static inline int 461 clpoutbyte(u_char byte, int spin, device_t ppbus) 462 { 463 int s = spin; 464 ppbus_wdtr(ppbus, ctxmitl[byte]); 465 while (ppbus_rstr(ppbus) & CLPIP_SHAKE) { 466 if (--s == 0) { 467 return 1; 468 } 469 } 470 s = spin; 471 ppbus_wdtr(ppbus, ctxmith[byte]); 472 while (!(ppbus_rstr(ppbus) & CLPIP_SHAKE)) { 473 if (--s == 0) { 474 return 1; 475 } 476 } 477 return 0; 478 } 479 480 static inline int 481 clpinbyte(int spin, device_t ppbus) 482 { 483 u_char c, cl; 484 int s = spin; 485 486 while (ppbus_rstr(ppbus) & CLPIP_SHAKE) { 487 if (!--s) { 488 return -1; 489 } 490 } 491 cl = ppbus_rstr(ppbus); 492 ppbus_wdtr(ppbus, 0x10); 493 494 s = spin; 495 while (!(ppbus_rstr(ppbus) & CLPIP_SHAKE)) { 496 if (!--s) { 497 return -1; 498 } 499 } 500 c = ppbus_rstr(ppbus); 501 ppbus_wdtr(ppbus, 0x00); 502 503 return (ctrecvl[cl] | ctrecvh[c]); 504 } 505 506 static void 507 lptap(struct ifnet *ifp, struct mbuf *m, u_int direction) 508 { 509 /* 510 * Send a packet through bpf. We need to prepend the address family 511 * as a four byte field. Cons up a dummy header to pacify bpf. This 512 * is safe because bpf will only read from the mbuf (i.e., it won't 513 * try to free it or keep a pointer to it). 514 */ 515 u_int32_t af = AF_INET; 516 struct mbuf m0; 517 518 m0.m_type = MT_DATA; 519 m0.m_next = m; 520 m0.m_nextpkt = NULL; 521 m0.m_owner = NULL; 522 m0.m_len = sizeof(u_int32_t); 523 m0.m_data = (char *)⁡ 524 m0.m_flags = 0; 525 bpf_mtap(ifp, &m0, direction); 526 } 527 528 /* Soft interrupt handler called by hardware interrupt handler */ 529 static void 530 lp_intr(void *arg) 531 { 532 device_t dev = (device_t)arg; 533 device_t ppbus = device_parent(dev); 534 struct lp_softc * sc = device_private(dev); 535 struct ifnet * ifp = &sc->sc_if; 536 struct mbuf *top; 537 int len, s, j; 538 u_char *bp; 539 u_char c, cl; 540 541 s = splnet(); 542 543 /* Do nothing if device not properly attached */ 544 if (sc->sc_dev_ok) { 545 LP_PRINTF("%s(%s): device not properly attached!", __func__, 546 device_xname(dev)); 547 goto done; 548 } 549 550 /* Do nothing if interface is not up */ 551 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 552 goto done; 553 554 /* If other side is no longer transmitting, do nothing */ 555 if (!(ppbus_rstr(ppbus) & LPIP_SHAKE)) 556 goto done; 557 558 /* Disable interrupts until we finish */ 559 ppbus_wctr(ppbus, ~IRQENABLE); 560 561 top = NULL; 562 bp = sc->sc_ifbuf; 563 /* Linux/crynwyr protocol receiving */ 564 if (ifp->if_flags & IFF_LINK0) { 565 /* Ack. the request */ 566 ppbus_wdtr(ppbus, 0x01); 567 568 /* Get the packet length */ 569 j = clpinbyte(LPMAXSPIN2, ppbus); 570 if (j == -1) 571 goto err; 572 len = j; 573 j = clpinbyte(LPMAXSPIN2, ppbus); 574 if (j == -1) 575 goto err; 576 len = len + (j << 8); 577 if (len > ifp->if_mtu + MLPIPHDRLEN) 578 goto err; 579 580 while (len--) { 581 j = clpinbyte(LPMAXSPIN2, ppbus); 582 if (j == -1) { 583 goto err; 584 } 585 *bp++ = j; 586 } 587 /* Get and ignore checksum */ 588 j = clpinbyte(LPMAXSPIN2, ppbus); 589 if (j == -1) { 590 goto err; 591 } 592 593 /* Return to idle state */ 594 ppbus_wdtr(ppbus, 0); 595 len = bp - sc->sc_ifbuf; 596 if (len <= CLPIPHDRLEN) 597 goto err; 598 len -= CLPIPHDRLEN; 599 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, ifp); 600 } 601 /* FreeBSD protocol receiving */ 602 else { 603 len = ifp->if_mtu + LPIPHDRLEN; 604 while (len--) { 605 cl = ppbus_rstr(ppbus); 606 ppbus_wdtr(ppbus, 0x08); 607 608 j = LPMAXSPIN2; 609 while ((ppbus_rstr(ppbus) & LPIP_SHAKE)) { 610 if (!--j) 611 goto err; 612 } 613 614 c = ppbus_rstr(ppbus); 615 ppbus_wdtr(ppbus, 0); 616 617 *bp++= trecvh[cl] | trecvl[c]; 618 619 j = LPMAXSPIN2; 620 while (!((cl = ppbus_rstr(ppbus)) & LPIP_SHAKE)) { 621 if (cl != c && 622 (((cl = ppbus_rstr(ppbus)) ^ 0xb8) & 623 0xf8) == (c & 0xf8)) 624 goto end; 625 if (!--j) 626 goto err; 627 } 628 } 629 630 end: 631 len = bp - sc->sc_ifbuf; 632 if (len <= LPIPHDRLEN) 633 goto err; 634 len -= LPIPHDRLEN; 635 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, ifp); 636 } 637 638 if (top == NULL) { 639 if_statinc(ifp, if_iqdrops); 640 goto err; 641 } 642 if (ifp->if_bpf) { 643 lptap(ifp, top, BPF_D_IN); 644 } 645 if (__predict_false(!pktq_enqueue(ip_pktq, top, 0))) { 646 if_statinc(ifp, if_iqdrops); 647 m_freem(top); 648 goto err; 649 } 650 if_statinc(ifp, if_ipackets); 651 if_statadd(ifp, if_ibytes, len); 652 sc->sc_iferrs = 0; 653 654 goto done; 655 656 err: 657 /* Return to idle state */ 658 ppbus_wdtr(ppbus, 0); 659 if_statinc(ifp, if_ierrors); 660 sc->sc_iferrs++; 661 LP_PRINTF("R"); 662 /* Disable interface if there are too many errors */ 663 if (sc->sc_iferrs > LPMAXERRS) { 664 aprint_error_dev(dev, "Too many consecutive errors, going off-line.\n"); 665 ppbus_wctr(ppbus, ~IRQENABLE); 666 if_down(ifp); 667 sc->sc_iferrs = 0; 668 } 669 670 done: 671 /* Re-enable interrupts */ 672 ppbus_wctr(ppbus, IRQENABLE); 673 /* If interface is not active, send some packets */ 674 if ((ifp->if_flags & IFF_OACTIVE) == 0) 675 lpstart(ifp); 676 splx(s); 677 return; 678 } 679 680 static inline int 681 lpoutbyte(u_char byte, int spin, device_t ppbus) 682 { 683 int s = spin; 684 ppbus_wdtr(ppbus, txmith[byte]); 685 while (!(ppbus_rstr(ppbus) & LPIP_SHAKE)) { 686 if (--s == 0) 687 return 1; 688 } 689 s = spin; 690 ppbus_wdtr(ppbus, txmitl[byte]); 691 while (ppbus_rstr(ppbus) & LPIP_SHAKE) { 692 if (--s == 0) 693 return 1; 694 } 695 return 0; 696 } 697 698 /* Queue a packet for delivery */ 699 static int 700 lpoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 701 const struct rtentry *rt) 702 { 703 struct lp_softc * sc = ifp->if_softc; 704 device_t dev = sc->ppbus_dev.sc_dev; 705 device_t ppbus = device_parent(dev); 706 int err; 707 int s; 708 709 s = splnet(); 710 711 if (sc->sc_dev_ok) { 712 LP_PRINTF("%s(%s): device not properly attached!", __func__, 713 device_xname(dev)); 714 err = ENODEV; 715 goto endoutput; 716 } 717 718 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 719 err = ENETDOWN; 720 goto endoutput; 721 } 722 723 /* Only support INET */ 724 if (dst->sa_family != AF_INET) { 725 LP_PRINTF("%s: af%d not supported\n", ifp->if_xname, 726 dst->sa_family); 727 if_statinc(ifp, if_noproto); 728 err = EAFNOSUPPORT; 729 goto endoutput; 730 } 731 732 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 733 IFQ_ENQUEUE(&ifp->if_snd, m, err); 734 if (err == 0) { 735 if ((ifp->if_flags & IFF_OACTIVE) == 0) 736 lpstart(ifp); 737 } else { 738 if_statinc(ifp, if_oerrors); 739 sc->sc_iferrs++; 740 LP_PRINTF("Q"); 741 742 /* Disable interface if there are too many errors */ 743 if (sc->sc_iferrs > LPMAXERRS) { 744 aprint_error_dev(dev, "Too many errors, going off-line.\n"); 745 ppbus_wctr(ppbus, ~IRQENABLE); 746 if_down(ifp); 747 sc->sc_iferrs = 0; 748 } 749 } 750 751 endoutput: 752 if ((err != 0) && (err != ENOBUFS)) 753 m_freem(m); 754 splx(s); 755 return err; 756 } 757 758 /* Send routine: send packets over PLIP cable. Call at splnet(). */ 759 void 760 lpstart(struct ifnet * ifp) 761 { 762 struct lp_softc * lp = ifp->if_softc; 763 device_t dev = lp->ppbus_dev.sc_dev; 764 device_t ppbus = device_parent(dev); 765 struct mbuf * mm; 766 struct mbuf * m; 767 u_char * cp; 768 int err, i, len, spin, count; 769 u_char str, chksum; 770 771 if (lp->sc_dev_ok) { 772 LP_PRINTF("%s(%s): device not properly attached!", __func__, 773 device_xname(dev)); 774 return; 775 } 776 777 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 778 return; 779 } 780 781 ifp->if_flags |= IFF_OACTIVE; 782 783 /* Go quiescent */ 784 ppbus_wdtr(ppbus, 0); 785 786 /* Output loop */ 787 for (;;) { 788 /* Check if there are packets to send */ 789 if (IFQ_IS_EMPTY(&ifp->if_snd)) { 790 goto final; 791 } 792 /* Try to send a packet, dequeue it later if successful */ 793 IFQ_POLL(&ifp->if_snd, m); 794 if (m == NULL) 795 goto final; 796 797 str = ppbus_rstr(ppbus); 798 /* Wait until other side is not transmitting */ 799 if ((str & LPIP_SHAKE) || 800 ((ifp->if_flags & IFF_LINK0) && !(str & CLPIP_SHAKE))) { 801 LP_PRINTF("&"); 802 if (++lp->sc_xmit_rtry > LPMAXRTRY) { 803 aprint_error_dev(dev, "Too many retries while channel " 804 "busy, going off-line.\n"); 805 ppbus_wctr(ppbus, ~IRQENABLE); 806 if_down(ifp); 807 lp->sc_xmit_rtry = 0; 808 } 809 goto final; 810 } 811 lp->sc_xmit_rtry = 0; 812 813 /* Disable interrupt generation */ 814 ppbus_wctr(ppbus, ~IRQENABLE); 815 816 err = 1; 817 818 /* Output packet for Linux/crynwyr compatible protocol */ 819 if (ifp->if_flags & IFF_LINK0) { 820 /* Calculate packet length */ 821 count = 14; /* Ethernet header len */ 822 for (mm = m; mm; mm = mm->m_next) { 823 count += mm->m_len; 824 } 825 826 /* Alert other end to pending packet */ 827 spin = LPMAXSPIN1; 828 ppbus_wdtr(ppbus, 0x08); 829 while ((ppbus_rstr(ppbus) & 0x08) == 0) { 830 if (--spin == 0) { 831 goto nend; 832 } 833 } 834 835 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 836 goto nend; 837 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 838 goto nend; 839 840 /* Send dummy ethernet header */ 841 chksum = 0; 842 for (i = 0; i < 12; i++) { 843 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 844 goto nend; 845 chksum += i; 846 } 847 848 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 849 goto nend; 850 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 851 goto nend; 852 chksum += 0x08 + 0x00; /* Add into checksum */ 853 854 mm = m; 855 do { 856 cp = mtod(mm, u_char *); 857 len = mm->m_len; 858 while (len--) { 859 if (clpoutbyte(*cp, LPMAXSPIN2, ppbus)) 860 goto nend; 861 chksum += *cp++; 862 } 863 } while ((mm = mm->m_next)); 864 865 /* Send checksum */ 866 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 867 goto nend; 868 869 /* No errors */ 870 err = 0; 871 /* Go quiescent */ 872 ppbus_wdtr(ppbus, 0); 873 } 874 /* Output packet for FreeBSD compatible protocol */ 875 else { 876 /* We need a sensible value if we abort */ 877 cp = NULL; 878 879 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 880 goto end; 881 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 882 goto end; 883 884 mm = m; 885 do { 886 cp = mtod(mm,u_char *); 887 len = mm->m_len; 888 while (len--) 889 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 890 goto end; 891 } while ((mm = mm->m_next)); 892 893 /* no errors were encountered */ 894 err = 0; 895 896 end: 897 if (cp) 898 ppbus_wdtr(ppbus, txmitl[*(--cp)] ^ 0x17); 899 else 900 ppbus_wdtr(ppbus, txmitl['\0'] ^ 0x17); 901 } 902 903 nend: 904 /* Re-enable interrupt generation */ 905 ppbus_wctr(ppbus, IRQENABLE); 906 907 if (err) { 908 /* Go quiescent */ 909 ppbus_wdtr(ppbus, 0); 910 911 if_statinc(ifp, if_oerrors); 912 lp->sc_iferrs++; 913 LP_PRINTF("X"); 914 915 /* Disable interface if there are too many errors */ 916 if (lp->sc_iferrs > LPMAXERRS) { 917 aprint_error_dev(dev, "Too many errors, going off-line.\n"); 918 ppbus_wctr(ppbus, ~IRQENABLE); 919 if_down(ifp); 920 lp->sc_iferrs = 0; 921 goto final; 922 } 923 } else { 924 /* Dequeue packet on success */ 925 IFQ_DEQUEUE(&ifp->if_snd, m); 926 if(ifp->if_bpf) 927 lptap(ifp, m, BPF_D_OUT); 928 if_statinc(ifp, if_opackets); 929 if_statadd(ifp, if_obytes, m->m_pkthdr.len); 930 m_freem(m); 931 } 932 } 933 934 final: 935 ifp->if_flags &= ~IFF_OACTIVE; 936 return; 937 } 938