if_ae.c revision 1.58
1 /* $NetBSD: if_ae.c,v 1.58 1997/03/15 18:09:56 is Exp $ */ 2 3 /* 4 * Device driver for National Semiconductor DS8390/WD83C690 based ethernet 5 * adapters. 6 * 7 * Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved. 8 * 9 * Copyright (C) 1993, David Greenman. This software may be used, modified, 10 * copied, distributed, and sold, in both source and binary form provided that 11 * the above copyright and these terms are retained. Under no circumstances is 12 * the author responsible for the proper functioning of this software, nor does 13 * the author assume any responsibility for damages incurred with its use. 14 * 15 * Adapted for MacBSD by Brad Parker <brad (at) fcr.com>. 16 * 17 * Currently supports: 18 * Apples NB Ethernet card 19 * Interlan A310 Nubus Ethernet card 20 * Cayman Systems GatorCard 21 * Asante MacCon II/E 22 */ 23 24 #include "bpfilter.h" 25 26 #include <sys/param.h> 27 #include <sys/systm.h> 28 #include <sys/errno.h> 29 #include <sys/ioctl.h> 30 #include <sys/mbuf.h> 31 #include <sys/socket.h> 32 #include <sys/syslog.h> 33 #include <sys/device.h> 34 35 #include <net/if.h> 36 #include <net/if_dl.h> 37 #include <net/if_types.h> 38 #include <net/if_ether.h> 39 40 #ifdef INET 41 #include <netinet/in.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/in_var.h> 44 #include <netinet/ip.h> 45 #include <netinet/if_inarp.h> 46 #endif 47 48 #ifdef NS 49 #include <netns/ns.h> 50 #include <netns/ns_if.h> 51 #endif 52 53 #if NBPFILTER > 0 54 #include <net/bpf.h> 55 #include <net/bpfdesc.h> 56 #endif 57 58 #include <machine/bus.h> 59 #include <machine/viareg.h> 60 61 #include <dev/ic/dp8390reg.h> 62 #include "if_aereg.h" 63 #include "if_aevar.h" 64 65 #define inline /* XXX for debugging porpoises */ 66 67 static inline void ae_rint __P((struct ae_softc *)); 68 static inline void ae_xmit __P((struct ae_softc *)); 69 static inline int ae_ring_copy __P((struct ae_softc *, int, caddr_t, int)); 70 71 #define ETHER_MIN_LEN 64 72 #define ETHER_MAX_LEN 1518 73 #define ETHER_ADDR_LEN 6 74 75 #define REG_MAP(sc, reg) ((sc)->regs_rev ? (0x0f-(reg))<<2 : (reg)<<2) 76 #define NIC_GET(sc, reg) (bus_space_read_1((sc)->sc_regt, \ 77 (sc)->sc_regh, \ 78 (REG_MAP(sc, reg)))) 79 #define NIC_PUT(sc, reg, val) (bus_space_write_1((sc)->sc_regt, \ 80 (sc)->sc_regh, \ 81 (REG_MAP(sc, reg)), (val))) 82 83 struct cfdriver ae_cd = { 84 NULL, "ae", DV_IFNET 85 }; 86 87 int 88 ae_size_card_memory(bst, bsh, ofs) 89 bus_space_tag_t bst; 90 bus_space_handle_t bsh; 91 int ofs; 92 { 93 int i1, i2, i3, i4; 94 95 /* 96 * banks; also assume it will generally mirror in upper banks 97 * if not installed. 98 */ 99 i1 = (8192 * 0); 100 i2 = (8192 * 1); 101 i3 = (8192 * 2); 102 i4 = (8192 * 3); 103 104 bus_space_write_2(bst, bsh, ofs + i1, 0x1111); 105 bus_space_write_2(bst, bsh, ofs + i2, 0x2222); 106 bus_space_write_2(bst, bsh, ofs + i3, 0x3333); 107 bus_space_write_2(bst, bsh, ofs + i4, 0x4444); 108 109 if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 && 110 bus_space_read_2(bst, bsh, ofs + i2) == 0x2222 && 111 bus_space_read_2(bst, bsh, ofs + i3) == 0x3333 && 112 bus_space_read_2(bst, bsh, ofs + i4) == 0x4444) 113 return 8192 * 4; 114 115 if ((bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 && 116 bus_space_read_2(bst, bsh, ofs + i2) == 0x2222) || 117 (bus_space_read_2(bst, bsh, ofs + i1) == 0x3333 && 118 bus_space_read_2(bst, bsh, ofs + i2) == 0x4444)) 119 return 8192 * 2; 120 121 if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 || 122 bus_space_read_2(bst, bsh, ofs + i1) == 0x4444) 123 return 8192; 124 125 return 0; 126 } 127 128 /* 129 * Do bus-independent setup. 130 */ 131 int 132 aesetup(sc, lladdr) 133 struct ae_softc *sc; 134 u_int8_t *lladdr; 135 { 136 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 137 int i; 138 139 sc->cr_proto = ED_CR_RD2; 140 141 /* Allocate one xmit buffer if < 16k, two buffers otherwise. */ 142 if ((sc->mem_size < 16384) || 143 (sc->sc_flags & AE_FLAGS_NO_DOUBLE_BUFFERING)) 144 sc->txb_cnt = 1; 145 else 146 sc->txb_cnt = 2; 147 148 sc->tx_page_start = 0; 149 sc->rec_page_start = sc->tx_page_start + sc->txb_cnt * ED_TXBUF_SIZE; 150 sc->rec_page_stop = sc->tx_page_start + (sc->mem_size >> ED_PAGE_SHIFT); 151 sc->mem_ring = sc->rec_page_start << ED_PAGE_SHIFT; 152 153 /* Now zero memory and verify that it is clear. */ 154 bus_space_set_region_2(sc->sc_buft, sc->sc_bufh, 155 0, 0, sc->mem_size / 2); 156 157 for (i = 0; i < sc->mem_size; ++i) { 158 if (bus_space_read_1(sc->sc_buft, sc->sc_bufh, i)) { 159 printf(": failed to clear shared memory - check configuration\n"); 160 return 1; 161 } 162 } 163 164 /* Set interface to stopped condition (reset). */ 165 aestop(sc); 166 167 /* Initialize ifnet structure. */ 168 bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ); 169 ifp->if_softc = sc; 170 ifp->if_start = aestart; 171 ifp->if_ioctl = aeioctl; 172 if (!ifp->if_watchdog) 173 ifp->if_watchdog = aewatchdog; 174 ifp->if_flags = 175 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 176 177 /* Attach the interface. */ 178 if_attach(ifp); 179 ether_ifattach(ifp, lladdr); 180 181 /* Print additional info when attached. */ 182 printf(": address %s, ", ether_sprintf(lladdr)); 183 184 printf("type %s, %dKB memory\n", sc->type_str, sc->mem_size / 1024); 185 186 #if NBPFILTER > 0 187 bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); 188 #endif 189 190 return 0; 191 } 192 193 /* 194 * Reset interface. 195 */ 196 void 197 aereset(sc) 198 struct ae_softc *sc; 199 { 200 int s; 201 202 s = splnet(); 203 aestop(sc); 204 aeinit(sc); 205 splx(s); 206 } 207 208 /* 209 * Take interface offline. 210 */ 211 void 212 aestop(sc) 213 struct ae_softc *sc; 214 { 215 int n = 5000; 216 217 /* Stop everything on the interface, and select page 0 registers. */ 218 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 219 220 /* 221 * Wait for interface to enter stopped state, but limit # of checks to 222 * 'n' (about 5ms). It shouldn't even take 5us on modern DS8390's, but 223 * just in case it's an old one. 224 */ 225 while (((NIC_GET(sc, ED_P0_ISR) & ED_ISR_RST) == 0) && --n); 226 } 227 228 /* 229 * Device timeout/watchdog routine. Entered if the device neglects to generate 230 * an interrupt after a transmit has been started on it. 231 */ 232 233 void 234 aewatchdog(ifp) 235 struct ifnet *ifp; 236 { 237 struct ae_softc *sc = ifp->if_softc; 238 239 log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname); 240 ++sc->sc_arpcom.ac_if.if_oerrors; 241 242 aereset(sc); 243 } 244 245 /* 246 * Initialize device. 247 */ 248 void 249 aeinit(sc) 250 struct ae_softc *sc; 251 { 252 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 253 int i; 254 u_char mcaf[8]; 255 256 /* 257 * Initialize the NIC in the exact order outlined in the NS manual. 258 * This init procedure is "mandatory"...don't change what or when 259 * things happen. 260 */ 261 262 /* Reset transmitter flags. */ 263 ifp->if_timer = 0; 264 265 sc->txb_inuse = 0; 266 sc->txb_new = 0; 267 sc->txb_next_tx = 0; 268 269 /* Set interface for page 0, remote DMA complete, stopped. */ 270 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 271 272 if (sc->use16bit) { 273 /* 274 * Set FIFO threshold to 8, No auto-init Remote DMA, byte 275 * order=80x86, word-wide DMA xfers, 276 */ 277 NIC_PUT(sc, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_WTS | ED_DCR_LS); 278 } else { 279 /* Same as above, but byte-wide DMA xfers. */ 280 NIC_PUT(sc, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 281 } 282 283 /* Clear remote byte count registers. */ 284 NIC_PUT(sc, ED_P0_RBCR0, 0); 285 NIC_PUT(sc, ED_P0_RBCR1, 0); 286 287 /* Tell RCR to do nothing for now. */ 288 NIC_PUT(sc, ED_P0_RCR, ED_RCR_MON); 289 290 /* Place NIC in internal loopback mode. */ 291 NIC_PUT(sc, ED_P0_TCR, ED_TCR_LB0); 292 293 /* Initialize receive buffer ring. */ 294 NIC_PUT(sc, ED_P0_TPSR, sc->rec_page_start); 295 NIC_PUT(sc, ED_P0_PSTART, sc->rec_page_start); 296 297 NIC_PUT(sc, ED_P0_PSTOP, sc->rec_page_stop); 298 NIC_PUT(sc, ED_P0_BNRY, sc->rec_page_start); 299 300 /* 301 * Clear all interrupts. A '1' in each bit position clears the 302 * corresponding flag. 303 */ 304 NIC_PUT(sc, ED_P0_ISR, 0xff); 305 306 /* 307 * Enable the following interrupts: receive/transmit complete, 308 * receive/transmit error, and Receiver OverWrite. 309 * 310 * Counter overflow and Remote DMA complete are *not* enabled. 311 */ 312 NIC_PUT(sc, ED_P0_IMR, 313 ED_IMR_PRXE | ED_IMR_PTXE | ED_IMR_RXEE | ED_IMR_TXEE | 314 ED_IMR_OVWE); 315 316 /* Program command register for page 1. */ 317 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_1 | ED_CR_STP); 318 319 /* Copy out our station address. */ 320 for (i = 0; i < ETHER_ADDR_LEN; ++i) 321 NIC_PUT(sc, ED_P1_PAR0 + i, sc->sc_arpcom.ac_enaddr[i]); 322 323 /* Set multicast filter on chip. */ 324 ae_getmcaf(&sc->sc_arpcom, mcaf); 325 for (i = 0; i < 8; i++) 326 NIC_PUT(sc, ED_P1_MAR0 + i, mcaf[i]); 327 328 /* 329 * Set current page pointer to one page after the boundary pointer, as 330 * recommended in the National manual. 331 */ 332 sc->next_packet = sc->rec_page_start + 1; 333 NIC_PUT(sc, ED_P1_CURR, sc->next_packet); 334 335 /* Program command register for page 0. */ 336 NIC_PUT(sc, ED_P1_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 337 338 i = ED_RCR_AB | ED_RCR_AM; 339 if (ifp->if_flags & IFF_PROMISC) { 340 /* 341 * Set promiscuous mode. Multicast filter was set earlier so 342 * that we should receive all multicast packets. 343 */ 344 i |= ED_RCR_PRO | ED_RCR_AR | ED_RCR_SEP; 345 } 346 NIC_PUT(sc, ED_P0_RCR, i); 347 348 /* Take interface out of loopback. */ 349 NIC_PUT(sc, ED_P0_TCR, 0); 350 351 /* Fire up the interface. */ 352 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 353 354 /* Set 'running' flag, and clear output active flag. */ 355 ifp->if_flags |= IFF_RUNNING; 356 ifp->if_flags &= ~IFF_OACTIVE; 357 358 /* ...and attempt to start output. */ 359 aestart(ifp); 360 } 361 362 /* 363 * This routine actually starts the transmission on the interface. 364 */ 365 static inline void 366 ae_xmit(sc) 367 struct ae_softc *sc; 368 { 369 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 370 u_short len; 371 372 len = sc->txb_len[sc->txb_next_tx]; 373 374 /* Set NIC for page 0 register access. */ 375 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 376 377 /* Set TX buffer start page. */ 378 NIC_PUT(sc, ED_P0_TPSR, sc->tx_page_start + 379 sc->txb_next_tx * ED_TXBUF_SIZE); 380 381 /* Set TX length. */ 382 NIC_PUT(sc, ED_P0_TBCR0, len); 383 NIC_PUT(sc, ED_P0_TBCR1, len >> 8); 384 385 /* Set page 0, remote DMA complete, transmit packet, and *start*. */ 386 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_TXP | ED_CR_STA); 387 388 /* Point to next transmit buffer slot and wrap if necessary. */ 389 sc->txb_next_tx++; 390 if (sc->txb_next_tx == sc->txb_cnt) 391 sc->txb_next_tx = 0; 392 393 /* Set a timer just in case we never hear from the board again. */ 394 ifp->if_timer = 2; 395 } 396 397 /* 398 * Start output on interface. 399 * We make two assumptions here: 400 * 1) that the current priority is set to splnet _before_ this code 401 * is called *and* is returned to the appropriate priority after 402 * return 403 * 2) that the IFF_OACTIVE flag is checked before this code is called 404 * (i.e. that the output part of the interface is idle) 405 */ 406 void 407 aestart(ifp) 408 struct ifnet *ifp; 409 { 410 struct ae_softc *sc = ifp->if_softc; 411 struct mbuf *m0; 412 int buffer; 413 int len; 414 415 if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING) 416 return; 417 418 outloop: 419 /* See if there is room to put another packet in the buffer. */ 420 if (sc->txb_inuse == sc->txb_cnt) { 421 /* No room. Indicate this to the outside world and exit. */ 422 ifp->if_flags |= IFF_OACTIVE; 423 return; 424 } 425 IF_DEQUEUE(&ifp->if_snd, m0); 426 if (m0 == 0) 427 return; 428 429 /* We need to use m->m_pkthdr.len, so require the header */ 430 if ((m0->m_flags & M_PKTHDR) == 0) 431 panic("aestart: no header mbuf"); 432 433 #if NBPFILTER > 0 434 /* Tap off here if there is a BPF listener. */ 435 if (ifp->if_bpf) 436 bpf_mtap(ifp->if_bpf, m0); 437 #endif 438 439 /* txb_new points to next open buffer slot. */ 440 buffer = (sc->txb_new * ED_TXBUF_SIZE) << ED_PAGE_SHIFT; 441 442 len = ae_put(sc, m0, buffer); 443 #if DIAGNOSTIC 444 if (len != m0->m_pkthdr.len) 445 printf("aestart: len %d != m0->m_pkthdr.len %d.\n", 446 len, m0->m_pkthdr.len); 447 #endif 448 len = m0->m_pkthdr.len; 449 450 m_freem(m0); 451 sc->txb_len[sc->txb_new] = max(len, ETHER_MIN_LEN); 452 453 /* Start the first packet transmitting. */ 454 if (sc->txb_inuse == 0) 455 ae_xmit(sc); 456 457 /* Point to next buffer slot and wrap if necessary. */ 458 if (++sc->txb_new == sc->txb_cnt) 459 sc->txb_new = 0; 460 461 sc->txb_inuse++; 462 463 /* Loop back to the top to possibly buffer more packets. */ 464 goto outloop; 465 } 466 467 /* 468 * Ethernet interface receiver interrupt. 469 */ 470 static inline void 471 ae_rint(sc) 472 struct ae_softc *sc; 473 { 474 u_char boundary, current; 475 u_short len; 476 u_char nlen; 477 u_int8_t *lenp; 478 struct ae_ring packet_hdr; 479 int packet_ptr; 480 481 loop: 482 /* Set NIC to page 1 registers to get 'current' pointer. */ 483 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_1 | ED_CR_STA); 484 485 /* 486 * 'sc->next_packet' is the logical beginning of the ring-buffer - i.e. 487 * it points to where new data has been buffered. The 'CURR' (current) 488 * register points to the logical end of the ring-buffer - i.e. it 489 * points to where additional new data will be added. We loop here 490 * until the logical beginning equals the logical end (or in other 491 * words, until the ring-buffer is empty). 492 */ 493 current = NIC_GET(sc, ED_P1_CURR); 494 if (sc->next_packet == current) 495 return; 496 497 /* Set NIC to page 0 registers to update boundary register. */ 498 NIC_PUT(sc, ED_P1_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 499 500 do { 501 /* Get pointer to this buffer's header structure. */ 502 packet_ptr = sc->mem_ring + 503 ((sc->next_packet - sc->rec_page_start) << ED_PAGE_SHIFT); 504 505 /* 506 * The byte count includes a 4 byte header that was added by 507 * the NIC. 508 */ 509 bus_space_read_region_1(sc->sc_buft, sc->sc_bufh, 510 packet_ptr, &packet_hdr, sizeof(struct ae_ring)); 511 lenp = (u_int8_t *)&packet_hdr.count; /* sigh. */ 512 len = lenp[0] | (lenp[1] << 8); 513 packet_hdr.count = len; 514 515 /* 516 * Try do deal with old, buggy chips that sometimes duplicate 517 * the low byte of the length into the high byte. We do this 518 * by simply ignoring the high byte of the length and always 519 * recalculating it. 520 * 521 * NOTE: sc->next_packet is pointing at the current packet. 522 */ 523 if (packet_hdr.next_packet >= sc->next_packet) 524 nlen = (packet_hdr.next_packet - sc->next_packet); 525 else 526 nlen = ((packet_hdr.next_packet - sc->rec_page_start) + 527 (sc->rec_page_stop - sc->next_packet)); 528 --nlen; 529 if ((len & ED_PAGE_MASK) + sizeof(packet_hdr) > ED_PAGE_SIZE) 530 --nlen; 531 len = (len & ED_PAGE_MASK) | (nlen << ED_PAGE_SHIFT); 532 #ifdef DIAGNOSTIC 533 if (len != packet_hdr.count) { 534 printf("%s: length does not match next packet pointer\n", 535 sc->sc_dev.dv_xname); 536 printf("%s: len %04x nlen %04x start %02x first %02x curr %02x next %02x stop %02x\n", 537 sc->sc_dev.dv_xname, packet_hdr.count, len, 538 sc->rec_page_start, sc->next_packet, current, 539 packet_hdr.next_packet, sc->rec_page_stop); 540 } 541 #endif 542 543 /* 544 * Be fairly liberal about what we allow as a "reasonable" 545 * length so that a [crufty] packet will make it to BPF (and 546 * can thus be analyzed). Note that all that is really 547 * important is that we have a length that will fit into one 548 * mbuf cluster or less; the upper layer protocols can then 549 * figure out the length from their own length field(s). 550 */ 551 if (len <= MCLBYTES && 552 packet_hdr.next_packet >= sc->rec_page_start && 553 packet_hdr.next_packet < sc->rec_page_stop) { 554 /* Go get packet. */ 555 aeread(sc, packet_ptr + sizeof(struct ae_ring), 556 len - sizeof(struct ae_ring)); 557 ++sc->sc_arpcom.ac_if.if_ipackets; 558 } else { 559 /* Really BAD. The ring pointers are corrupted. */ 560 log(LOG_ERR, 561 "%s: NIC memory corrupt - invalid packet length %d\n", 562 sc->sc_dev.dv_xname, len); 563 ++sc->sc_arpcom.ac_if.if_ierrors; 564 aereset(sc); 565 return; 566 } 567 568 /* Update next packet pointer. */ 569 sc->next_packet = packet_hdr.next_packet; 570 571 /* 572 * Update NIC boundary pointer - being careful to keep it one 573 * buffer behind (as recommended by NS databook). 574 */ 575 boundary = sc->next_packet - 1; 576 if (boundary < sc->rec_page_start) 577 boundary = sc->rec_page_stop - 1; 578 NIC_PUT(sc, ED_P0_BNRY, boundary); 579 } while (sc->next_packet != current); 580 581 goto loop; 582 } 583 584 /* Ethernet interface interrupt processor. */ 585 void 586 aeintr(arg, slot) 587 void *arg; 588 int slot; 589 { 590 struct ae_softc *sc = (struct ae_softc *)arg; 591 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 592 u_char isr; 593 594 /* Set NIC to page 0 registers. */ 595 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 596 597 isr = NIC_GET(sc, ED_P0_ISR); 598 if (!isr) 599 return; 600 601 /* Loop until there are no more new interrupts. */ 602 for (;;) { 603 /* 604 * Reset all the bits that we are 'acknowledging' by writing a 605 * '1' to each bit position that was set. 606 * (Writing a '1' *clears* the bit.) 607 */ 608 NIC_PUT(sc, ED_P0_ISR, isr); 609 610 /* 611 * Handle transmitter interrupts. Handle these first because 612 * the receiver will reset the board under some conditions. 613 */ 614 if (isr & (ED_ISR_PTX | ED_ISR_TXE)) { 615 u_char collisions = NIC_GET(sc, ED_P0_NCR) & 0x0f; 616 617 /* 618 * Check for transmit error. If a TX completed with an 619 * error, we end up throwing the packet away. Really 620 * the only error that is possible is excessive 621 * collisions, and in this case it is best to allow the 622 * automatic mechanisms of TCP to backoff the flow. Of 623 * course, with UDP we're screwed, but this is expected 624 * when a network is heavily loaded. 625 */ 626 (void) NIC_GET(sc, ED_P0_TSR); 627 if (isr & ED_ISR_TXE) { 628 /* 629 * Excessive collisions (16). 630 */ 631 if ((NIC_GET(sc, ED_P0_TSR) & ED_TSR_ABT) 632 && (collisions == 0)) { 633 /* 634 * When collisions total 16, the P0_NCR 635 * will indicate 0, and the TSR_ABT is 636 * set. 637 */ 638 collisions = 16; 639 } 640 641 /* Update output errors counter. */ 642 ++ifp->if_oerrors; 643 } else { 644 /* 645 * Update total number of successfully 646 * transmitted packets. 647 */ 648 ++ifp->if_opackets; 649 } 650 651 /* Done with the buffer. */ 652 sc->txb_inuse--; 653 654 /* Clear watchdog timer. */ 655 ifp->if_timer = 0; 656 ifp->if_flags &= ~IFF_OACTIVE; 657 658 /* 659 * Add in total number of collisions on last 660 * transmission. 661 */ 662 ifp->if_collisions += collisions; 663 664 /* 665 * Decrement buffer in-use count if not zero (can only 666 * be zero if a transmitter interrupt occured while not 667 * actually transmitting). 668 * If data is ready to transmit, start it transmitting, 669 * otherwise defer until after handling receiver. 670 */ 671 if (sc->txb_inuse > 0) 672 ae_xmit(sc); 673 } 674 675 /* Handle receiver interrupts. */ 676 if (isr & (ED_ISR_PRX | ED_ISR_RXE | ED_ISR_OVW)) { 677 /* 678 * Overwrite warning. In order to make sure that a 679 * lockup of the local DMA hasn't occurred, we reset 680 * and re-init the NIC. The NSC manual suggests only a 681 * partial reset/re-init is necessary - but some chips 682 * seem to want more. The DMA lockup has been seen 683 * only with early rev chips - Methinks this bug was 684 * fixed in later revs. -DG 685 */ 686 if (isr & ED_ISR_OVW) { 687 ++ifp->if_ierrors; 688 #ifdef DIAGNOSTIC 689 log(LOG_WARNING, 690 "%s: warning - receiver ring buffer overrun\n", 691 sc->sc_dev.dv_xname); 692 #endif 693 /* Stop/reset/re-init NIC. */ 694 aereset(sc); 695 } else { 696 /* 697 * Receiver Error. One or more of: CRC error, 698 * frame alignment error FIFO overrun, or 699 * missed packet. 700 */ 701 if (isr & ED_ISR_RXE) { 702 ++ifp->if_ierrors; 703 #ifdef AE_DEBUG 704 printf("%s: receive error %x\n", 705 sc->sc_dev.dv_xname, 706 NIC_GET(sc, ED_P0_RSR)); 707 #endif 708 } 709 710 /* 711 * Go get the packet(s) 712 * XXX - Doing this on an error is dubious 713 * because there shouldn't be any data to get 714 * (we've configured the interface to not 715 * accept packets with errors). 716 */ 717 ae_rint(sc); 718 } 719 } 720 721 /* 722 * If it looks like the transmitter can take more data, attempt 723 * to start output on the interface. This is done after 724 * handling the receiver to give the receiver priority. 725 */ 726 aestart(ifp); 727 728 /* 729 * Return NIC CR to standard state: page 0, remote DMA 730 * complete, start (toggling the TXP bit off, even if was just 731 * set in the transmit routine, is *okay* - it is 'edge' 732 * triggered from low to high). 733 */ 734 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 735 736 /* 737 * If the Network Talley Counters overflow, read them to reset 738 * them. It appears that old 8390's won't clear the ISR flag 739 * otherwise - resulting in an infinite loop. 740 */ 741 if (isr & ED_ISR_CNT) { 742 (void)NIC_GET(sc, ED_P0_CNTR0); 743 (void)NIC_GET(sc, ED_P0_CNTR1); 744 (void)NIC_GET(sc, ED_P0_CNTR2); 745 } 746 747 isr = NIC_GET(sc, ED_P0_ISR); 748 if (!isr) 749 return; 750 } 751 } 752 753 /* 754 * Process an ioctl request. This code needs some work - it looks pretty ugly. 755 */ 756 int 757 aeioctl(ifp, cmd, data) 758 register struct ifnet *ifp; 759 u_long cmd; 760 caddr_t data; 761 { 762 struct ae_softc *sc = ifp->if_softc; 763 register struct ifaddr *ifa = (struct ifaddr *) data; 764 struct ifreq *ifr = (struct ifreq *) data; 765 int s, error = 0; 766 767 s = splnet(); 768 769 switch (cmd) { 770 771 case SIOCSIFADDR: 772 ifp->if_flags |= IFF_UP; 773 774 switch (ifa->ifa_addr->sa_family) { 775 #ifdef INET 776 case AF_INET: 777 aeinit(sc); 778 arp_ifinit(&sc->sc_arpcom, ifa); 779 break; 780 #endif 781 #ifdef NS 782 /* XXX - This code is probably wrong. */ 783 case AF_NS: 784 { 785 register struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 786 787 if (ns_nullhost(*ina)) 788 ina->x_host = 789 *(union ns_host *) (sc->sc_arpcom.ac_enaddr); 790 else 791 bcopy(ina->x_host.c_host, 792 sc->sc_arpcom.ac_enaddr, 793 sizeof(sc->sc_arpcom.ac_enaddr)); 794 /* Set new address. */ 795 aeinit(sc); 796 break; 797 } 798 #endif 799 default: 800 aeinit(sc); 801 break; 802 } 803 break; 804 805 case SIOCSIFFLAGS: 806 if ((ifp->if_flags & IFF_UP) == 0 && 807 (ifp->if_flags & IFF_RUNNING) != 0) { 808 /* 809 * If interface is marked down and it is running, then 810 * stop it. 811 */ 812 aestop(sc); 813 ifp->if_flags &= ~IFF_RUNNING; 814 } else 815 if ((ifp->if_flags & IFF_UP) != 0 && 816 (ifp->if_flags & IFF_RUNNING) == 0) { 817 /* 818 * If interface is marked up and it is stopped, then 819 * start it. 820 */ 821 aeinit(sc); 822 } else { 823 /* 824 * Reset the interface to pick up changes in any other 825 * flags that affect hardware registers. 826 */ 827 aestop(sc); 828 aeinit(sc); 829 } 830 break; 831 832 case SIOCADDMULTI: 833 case SIOCDELMULTI: 834 /* Update our multicast list. */ 835 error = (cmd == SIOCADDMULTI) ? 836 ether_addmulti(ifr, &sc->sc_arpcom) : 837 ether_delmulti(ifr, &sc->sc_arpcom); 838 839 if (error == ENETRESET) { 840 /* 841 * Multicast list has changed; set the hardware filter 842 * accordingly. 843 */ 844 aestop(sc); /* XXX for ds_setmcaf? */ 845 aeinit(sc); 846 error = 0; 847 } 848 break; 849 850 default: 851 error = EINVAL; 852 break; 853 } 854 855 splx(s); 856 return (error); 857 } 858 859 /* 860 * Retreive packet from shared memory and send to the next level up via 861 * ether_input(). If there is a BPF listener, give a copy to BPF, too. 862 */ 863 void 864 aeread(sc, buf, len) 865 struct ae_softc *sc; 866 int buf; 867 int len; 868 { 869 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 870 struct mbuf *m; 871 struct ether_header *eh; 872 873 /* Pull packet off interface. */ 874 m = aeget(sc, buf, len); 875 if (m == 0) { 876 ifp->if_ierrors++; 877 return; 878 } 879 880 ifp->if_ipackets++; 881 882 /* We assume that the header fits entirely in one mbuf. */ 883 eh = mtod(m, struct ether_header *); 884 885 #if NBPFILTER > 0 886 /* 887 * Check if there's a BPF listener on this interface. 888 * If so, hand off the raw packet to bpf. 889 */ 890 if (ifp->if_bpf) { 891 bpf_mtap(ifp->if_bpf, m); 892 893 /* 894 * Note that the interface cannot be in promiscuous mode if 895 * there are no BPF listeners. And if we are in promiscuous 896 * mode, we have to check if this packet is really ours. 897 */ 898 if ((ifp->if_flags & IFF_PROMISC) && 899 (eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */ 900 bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr, 901 sizeof(eh->ether_dhost)) != 0) { 902 m_freem(m); 903 return; 904 } 905 } 906 #endif 907 908 /* Fix up data start offset in mbuf to point past ether header. */ 909 m_adj(m, sizeof(struct ether_header)); 910 ether_input(ifp, eh, m); 911 } 912 913 /* 914 * Supporting routines. 915 */ 916 /* 917 * Given a source and destination address, copy 'amount' of a packet from the 918 * ring buffer into a linear destination buffer. Takes into account ring-wrap. 919 */ 920 static inline int 921 ae_ring_copy(sc, src, dst, amount) 922 struct ae_softc *sc; 923 int src; 924 caddr_t dst; 925 int amount; 926 { 927 bus_space_tag_t bst = sc->sc_buft; 928 bus_space_handle_t bsh = sc->sc_bufh; 929 int tmp_amount; 930 931 /* Does copy wrap to lower addr in ring buffer? */ 932 if (src + amount > sc->mem_size) { 933 tmp_amount = sc->mem_size - src; 934 935 /* Copy amount up to end of NIC memory. */ 936 bus_space_read_region_1(bst, bsh, src, dst, tmp_amount); 937 938 amount -= tmp_amount; 939 src = sc->mem_ring; 940 dst += tmp_amount; 941 } 942 bus_space_read_region_1(bst, bsh, src, dst, amount); 943 944 return (src + amount); 945 } 946 947 /* 948 * Copy data from receive buffer to end of mbuf chain allocate additional mbufs 949 * as needed. Return pointer to last mbuf in chain. 950 * sc = ae info (softc) 951 * src = pointer in ae ring buffer 952 * dst = pointer to last mbuf in mbuf chain to copy to 953 * amount = amount of data to copy 954 */ 955 struct mbuf * 956 aeget(sc, src, total_len) 957 struct ae_softc *sc; 958 int src; 959 u_short total_len; 960 { 961 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 962 struct mbuf *top, **mp, *m; 963 int len; 964 965 MGETHDR(m, M_DONTWAIT, MT_DATA); 966 if (m == 0) 967 return 0; 968 m->m_pkthdr.rcvif = ifp; 969 m->m_pkthdr.len = total_len; 970 len = MHLEN; 971 top = 0; 972 mp = ⊤ 973 974 while (total_len > 0) { 975 if (top) { 976 MGET(m, M_DONTWAIT, MT_DATA); 977 if (m == 0) { 978 m_freem(top); 979 return 0; 980 } 981 len = MLEN; 982 } 983 if (total_len >= MINCLSIZE) { 984 MCLGET(m, M_DONTWAIT); 985 if (m->m_flags & M_EXT) 986 len = MCLBYTES; 987 } 988 m->m_len = len = min(total_len, len); 989 src = ae_ring_copy(sc, src, mtod(m, caddr_t), len); 990 total_len -= len; 991 *mp = m; 992 mp = &m->m_next; 993 } 994 995 return top; 996 } 997 998 /* 999 * Compute the multicast address filter from the list of multicast addresses we 1000 * need to listen to. 1001 */ 1002 void 1003 ae_getmcaf(ac, af) 1004 struct arpcom *ac; 1005 u_char *af; 1006 { 1007 struct ifnet *ifp = &ac->ac_if; 1008 struct ether_multi *enm; 1009 register u_char *cp, c; 1010 register u_long crc; 1011 register int i, len; 1012 struct ether_multistep step; 1013 1014 /* 1015 * Set up multicast address filter by passing all multicast addresses 1016 * through a crc generator, and then using the high order 6 bits as an 1017 * index into the 64 bit logical address filter. The high order bit 1018 * selects the word, while the rest of the bits select the bit within 1019 * the word. 1020 */ 1021 1022 if (ifp->if_flags & IFF_PROMISC) { 1023 ifp->if_flags |= IFF_ALLMULTI; 1024 for (i = 0; i < 8; i++) 1025 af[i] = 0xff; 1026 return; 1027 } 1028 for (i = 0; i < 8; i++) 1029 af[i] = 0; 1030 ETHER_FIRST_MULTI(step, ac, enm); 1031 while (enm != NULL) { 1032 if (bcmp(enm->enm_addrlo, enm->enm_addrhi, 1033 sizeof(enm->enm_addrlo)) != 0) { 1034 /* 1035 * We must listen to a range of multicast addresses. 1036 * For now, just accept all multicasts, rather than 1037 * trying to set only those filter bits needed to match 1038 * the range. (At this time, the only use of address 1039 * ranges is for IP multicast routing, for which the 1040 * range is big enough to require all bits set.) 1041 */ 1042 ifp->if_flags |= IFF_ALLMULTI; 1043 for (i = 0; i < 8; i++) 1044 af[i] = 0xff; 1045 return; 1046 } 1047 cp = enm->enm_addrlo; 1048 crc = 0xffffffff; 1049 for (len = sizeof(enm->enm_addrlo); --len >= 0;) { 1050 c = *cp++; 1051 for (i = 8; --i >= 0;) { 1052 if (((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01)) { 1053 crc <<= 1; 1054 crc ^= 0x04c11db6 | 1; 1055 } else 1056 crc <<= 1; 1057 c >>= 1; 1058 } 1059 } 1060 /* Just want the 6 most significant bits. */ 1061 crc >>= 26; 1062 1063 /* Turn on the corresponding bit in the filter. */ 1064 af[crc >> 3] |= 1 << (crc & 0x7); 1065 1066 ETHER_NEXT_MULTI(step, enm); 1067 } 1068 ifp->if_flags &= ~IFF_ALLMULTI; 1069 } 1070 1071 /* 1072 * Copy packet from mbuf to the board memory 1073 * 1074 * Currently uses an extra buffer/extra memory copy, 1075 * unless the whole packet fits in one mbuf. 1076 * 1077 */ 1078 int 1079 ae_put(sc, m, buf) 1080 struct ae_softc *sc; 1081 struct mbuf *m; 1082 int buf; 1083 { 1084 u_char *data, savebyte[2]; 1085 int len, wantbyte; 1086 u_short totlen = 0; 1087 1088 wantbyte = 0; 1089 1090 for (; m ; m = m->m_next) { 1091 data = mtod(m, u_char *); 1092 len = m->m_len; 1093 totlen += len; 1094 if (len > 0) { 1095 /* Finish the last word. */ 1096 if (wantbyte) { 1097 savebyte[1] = *data; 1098 bus_space_write_region_2(sc->sc_buft, 1099 sc->sc_bufh, buf, savebyte, 1); 1100 buf += 2; 1101 data++; 1102 len--; 1103 wantbyte = 0; 1104 } 1105 /* Output contiguous words. */ 1106 if (len > 1) { 1107 bus_space_write_region_2(sc->sc_buft, 1108 sc->sc_bufh, buf, data, len >> 1); 1109 buf += len & ~1; 1110 data += len & ~1; 1111 len &= 1; 1112 } 1113 /* Save last byte, if necessary. */ 1114 if (len == 1) { 1115 savebyte[0] = *data; 1116 wantbyte = 1; 1117 } 1118 } 1119 } 1120 1121 if (wantbyte) { 1122 savebyte[1] = 0; 1123 bus_space_write_region_2(sc->sc_buft, sc->sc_bufh, 1124 buf, savebyte, 1); 1125 } 1126 return (totlen); 1127 } 1128
Indexes created Tue Sep 23 14:10:03 GMT 2025