if_ae.c revision 1.55
1 /* $NetBSD: if_ae.c,v 1.55 1997/02/28 07:52:44 scottr 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/netisr.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_ether.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 * very simple size memory, assuming it's installed in 8k 97 * banks; also assume it will generally mirror in upper banks 98 * if not installed. 99 */ 100 i1 = (8192 * 0) / 2; 101 i2 = (8192 * 1) / 2; 102 i3 = (8192 * 2) / 2; 103 i4 = (8192 * 3) / 2; 104 105 bus_space_write_2(bst, bsh, ofs + i1, 0x1111); 106 bus_space_write_2(bst, bsh, ofs + i2, 0x2222); 107 bus_space_write_2(bst, bsh, ofs + i3, 0x3333); 108 bus_space_write_2(bst, bsh, ofs + i4, 0x4444); 109 110 if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 && 111 bus_space_read_2(bst, bsh, ofs + i2) == 0x2222 && 112 bus_space_read_2(bst, bsh, ofs + i3) == 0x3333 && 113 bus_space_read_2(bst, bsh, ofs + i4) == 0x4444) 114 return 8192 * 4; 115 116 if ((bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 && 117 bus_space_read_2(bst, bsh, ofs + i2) == 0x2222) || 118 (bus_space_read_2(bst, bsh, ofs + i1) == 0x3333 && 119 bus_space_read_2(bst, bsh, ofs + i2) == 0x4444)) 120 return 8192 * 2; 121 122 if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 || 123 bus_space_read_2(bst, bsh, ofs + i1) == 0x4444) 124 return 8192; 125 126 return 0; 127 } 128 129 /* 130 * Do bus-independent setup. 131 */ 132 void 133 aesetup(sc) 134 struct ae_softc *sc; 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("%s: failed to clear shared memory - check configuration\n", 160 sc->sc_dev.dv_xname); 161 162 /* Set interface to stopped condition (reset). */ 163 aestop(sc); 164 165 /* Initialize ifnet structure. */ 166 bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ); 167 ifp->if_softc = sc; 168 ifp->if_start = aestart; 169 ifp->if_ioctl = aeioctl; 170 if (!ifp->if_watchdog) 171 ifp->if_watchdog = aewatchdog; 172 ifp->if_flags = 173 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 174 175 /* Attach the interface. */ 176 if_attach(ifp); 177 ether_ifattach(ifp); 178 179 /* Print additional info when attached. */ 180 printf(": address %s, ", ether_sprintf(sc->sc_arpcom.ac_enaddr)); 181 182 printf("type %s, %dKB memory\n", sc->type_str, sc->mem_size / 1024); 183 184 #if NBPFILTER > 0 185 bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); 186 #endif 187 } 188 189 /* 190 * Reset interface. 191 */ 192 void 193 aereset(sc) 194 struct ae_softc *sc; 195 { 196 int s; 197 198 s = splnet(); 199 aestop(sc); 200 aeinit(sc); 201 splx(s); 202 } 203 204 /* 205 * Take interface offline. 206 */ 207 void 208 aestop(sc) 209 struct ae_softc *sc; 210 { 211 int n = 5000; 212 213 /* Stop everything on the interface, and select page 0 registers. */ 214 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 215 216 /* 217 * Wait for interface to enter stopped state, but limit # of checks to 218 * 'n' (about 5ms). It shouldn't even take 5us on modern DS8390's, but 219 * just in case it's an old one. 220 */ 221 while (((NIC_GET(sc, ED_P0_ISR) & ED_ISR_RST) == 0) && --n); 222 } 223 224 /* 225 * Device timeout/watchdog routine. Entered if the device neglects to generate 226 * an interrupt after a transmit has been started on it. 227 */ 228 229 void 230 aewatchdog(ifp) 231 struct ifnet *ifp; 232 { 233 struct ae_softc *sc = ifp->if_softc; 234 235 log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname); 236 ++sc->sc_arpcom.ac_if.if_oerrors; 237 238 aereset(sc); 239 } 240 241 /* 242 * Initialize device. 243 */ 244 void 245 aeinit(sc) 246 struct ae_softc *sc; 247 { 248 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 249 int i; 250 u_char mcaf[8]; 251 252 /* 253 * Initialize the NIC in the exact order outlined in the NS manual. 254 * This init procedure is "mandatory"...don't change what or when 255 * things happen. 256 */ 257 258 /* Reset transmitter flags. */ 259 ifp->if_timer = 0; 260 261 sc->txb_inuse = 0; 262 sc->txb_new = 0; 263 sc->txb_next_tx = 0; 264 265 /* Set interface for page 0, remote DMA complete, stopped. */ 266 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 267 268 if (sc->use16bit) { 269 /* 270 * Set FIFO threshold to 8, No auto-init Remote DMA, byte 271 * order=80x86, word-wide DMA xfers, 272 */ 273 NIC_PUT(sc, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_WTS | ED_DCR_LS); 274 } else { 275 /* Same as above, but byte-wide DMA xfers. */ 276 NIC_PUT(sc, ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS); 277 } 278 279 /* Clear remote byte count registers. */ 280 NIC_PUT(sc, ED_P0_RBCR0, 0); 281 NIC_PUT(sc, ED_P0_RBCR1, 0); 282 283 /* Tell RCR to do nothing for now. */ 284 NIC_PUT(sc, ED_P0_RCR, ED_RCR_MON); 285 286 /* Place NIC in internal loopback mode. */ 287 NIC_PUT(sc, ED_P0_TCR, ED_TCR_LB0); 288 289 /* Initialize receive buffer ring. */ 290 NIC_PUT(sc, ED_P0_TPSR, sc->rec_page_start); 291 NIC_PUT(sc, ED_P0_PSTART, sc->rec_page_start); 292 293 NIC_PUT(sc, ED_P0_PSTOP, sc->rec_page_stop); 294 NIC_PUT(sc, ED_P0_BNRY, sc->rec_page_start); 295 296 /* 297 * Clear all interrupts. A '1' in each bit position clears the 298 * corresponding flag. 299 */ 300 NIC_PUT(sc, ED_P0_ISR, 0xff); 301 302 /* 303 * Enable the following interrupts: receive/transmit complete, 304 * receive/transmit error, and Receiver OverWrite. 305 * 306 * Counter overflow and Remote DMA complete are *not* enabled. 307 */ 308 NIC_PUT(sc, ED_P0_IMR, 309 ED_IMR_PRXE | ED_IMR_PTXE | ED_IMR_RXEE | ED_IMR_TXEE | 310 ED_IMR_OVWE); 311 312 /* Program command register for page 1. */ 313 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_1 | ED_CR_STP); 314 315 /* Copy out our station address. */ 316 for (i = 0; i < ETHER_ADDR_LEN; ++i) 317 NIC_PUT(sc, ED_P1_PAR0 + i, sc->sc_arpcom.ac_enaddr[i]); 318 319 /* Set multicast filter on chip. */ 320 ae_getmcaf(&sc->sc_arpcom, mcaf); 321 for (i = 0; i < 8; i++) 322 NIC_PUT(sc, ED_P1_MAR0 + i, mcaf[i]); 323 324 /* 325 * Set current page pointer to one page after the boundary pointer, as 326 * recommended in the National manual. 327 */ 328 sc->next_packet = sc->rec_page_start + 1; 329 NIC_PUT(sc, ED_P1_CURR, sc->next_packet); 330 331 /* Program command register for page 0. */ 332 NIC_PUT(sc, ED_P1_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STP); 333 334 i = ED_RCR_AB | ED_RCR_AM; 335 if (ifp->if_flags & IFF_PROMISC) { 336 /* 337 * Set promiscuous mode. Multicast filter was set earlier so 338 * that we should receive all multicast packets. 339 */ 340 i |= ED_RCR_PRO | ED_RCR_AR | ED_RCR_SEP; 341 } 342 NIC_PUT(sc, ED_P0_RCR, i); 343 344 /* Take interface out of loopback. */ 345 NIC_PUT(sc, ED_P0_TCR, 0); 346 347 /* Fire up the interface. */ 348 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 349 350 /* Set 'running' flag, and clear output active flag. */ 351 ifp->if_flags |= IFF_RUNNING; 352 ifp->if_flags &= ~IFF_OACTIVE; 353 354 /* ...and attempt to start output. */ 355 aestart(ifp); 356 } 357 358 /* 359 * This routine actually starts the transmission on the interface. 360 */ 361 static inline void 362 ae_xmit(sc) 363 struct ae_softc *sc; 364 { 365 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 366 u_short len; 367 368 len = sc->txb_len[sc->txb_next_tx]; 369 370 /* Set NIC for page 0 register access. */ 371 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 372 373 /* Set TX buffer start page. */ 374 NIC_PUT(sc, ED_P0_TPSR, sc->tx_page_start + 375 sc->txb_next_tx * ED_TXBUF_SIZE); 376 377 /* Set TX length. */ 378 NIC_PUT(sc, ED_P0_TBCR0, len); 379 NIC_PUT(sc, ED_P0_TBCR1, len >> 8); 380 381 /* Set page 0, remote DMA complete, transmit packet, and *start*. */ 382 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_TXP | ED_CR_STA); 383 384 /* Point to next transmit buffer slot and wrap if necessary. */ 385 sc->txb_next_tx++; 386 if (sc->txb_next_tx == sc->txb_cnt) 387 sc->txb_next_tx = 0; 388 389 /* Set a timer just in case we never hear from the board again. */ 390 ifp->if_timer = 2; 391 } 392 393 /* 394 * Start output on interface. 395 * We make two assumptions here: 396 * 1) that the current priority is set to splnet _before_ this code 397 * is called *and* is returned to the appropriate priority after 398 * return 399 * 2) that the IFF_OACTIVE flag is checked before this code is called 400 * (i.e. that the output part of the interface is idle) 401 */ 402 void 403 aestart(ifp) 404 struct ifnet *ifp; 405 { 406 struct ae_softc *sc = ifp->if_softc; 407 struct mbuf *m0; 408 int buffer; 409 int len; 410 411 if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING) 412 return; 413 414 outloop: 415 /* See if there is room to put another packet in the buffer. */ 416 if (sc->txb_inuse == sc->txb_cnt) { 417 /* No room. Indicate this to the outside world and exit. */ 418 ifp->if_flags |= IFF_OACTIVE; 419 return; 420 } 421 IF_DEQUEUE(&ifp->if_snd, m0); 422 if (m0 == 0) 423 return; 424 425 /* We need to use m->m_pkthdr.len, so require the header */ 426 if ((m0->m_flags & M_PKTHDR) == 0) 427 panic("aestart: no header mbuf"); 428 429 #if NBPFILTER > 0 430 /* Tap off here if there is a BPF listener. */ 431 if (ifp->if_bpf) 432 bpf_mtap(ifp->if_bpf, m0); 433 #endif 434 435 /* txb_new points to next open buffer slot. */ 436 buffer = (sc->txb_new * ED_TXBUF_SIZE) << ED_PAGE_SHIFT; 437 438 len = ae_put(sc, m0, buffer); 439 #if DIAGNOSTIC 440 if (len != m0->m_pkthdr.len) 441 printf("aestart: len %d != m0->m_pkthdr.len %d.\n", 442 len, m0->m_pkthdr.len); 443 #endif 444 len = m0->m_pkthdr.len; 445 446 m_freem(m0); 447 sc->txb_len[sc->txb_new] = max(len, ETHER_MIN_LEN); 448 449 /* Start the first packet transmitting. */ 450 if (sc->txb_inuse == 0) 451 ae_xmit(sc); 452 453 /* Point to next buffer slot and wrap if necessary. */ 454 if (++sc->txb_new == sc->txb_cnt) 455 sc->txb_new = 0; 456 457 sc->txb_inuse++; 458 459 /* Loop back to the top to possibly buffer more packets. */ 460 goto outloop; 461 } 462 463 /* 464 * Ethernet interface receiver interrupt. 465 */ 466 static inline void 467 ae_rint(sc) 468 struct ae_softc *sc; 469 { 470 u_char boundary, current; 471 u_short len; 472 u_char nlen; 473 u_int8_t *lenp; 474 struct ae_ring packet_hdr; 475 int packet_ptr; 476 477 loop: 478 /* Set NIC to page 1 registers to get 'current' pointer. */ 479 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_1 | ED_CR_STA); 480 481 /* 482 * 'sc->next_packet' is the logical beginning of the ring-buffer - i.e. 483 * it points to where new data has been buffered. The 'CURR' (current) 484 * register points to the logical end of the ring-buffer - i.e. it 485 * points to where additional new data will be added. We loop here 486 * until the logical beginning equals the logical end (or in other 487 * words, until the ring-buffer is empty). 488 */ 489 current = NIC_GET(sc, ED_P1_CURR); 490 if (sc->next_packet == current) 491 return; 492 493 /* Set NIC to page 0 registers to update boundary register. */ 494 NIC_PUT(sc, ED_P1_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 495 496 do { 497 /* Get pointer to this buffer's header structure. */ 498 packet_ptr = sc->mem_ring + 499 ((sc->next_packet - sc->rec_page_start) << ED_PAGE_SHIFT); 500 501 /* 502 * The byte count includes a 4 byte header that was added by 503 * the NIC. 504 */ 505 bus_space_read_region_1(sc->sc_buft, sc->sc_bufh, 506 packet_ptr, &packet_hdr, sizeof(struct ae_ring)); 507 lenp = (u_int8_t *)&packet_hdr.count; /* sigh. */ 508 len = lenp[0] | (lenp[1] << 8); 509 packet_hdr.count = len; 510 511 /* 512 * Try do deal with old, buggy chips that sometimes duplicate 513 * the low byte of the length into the high byte. We do this 514 * by simply ignoring the high byte of the length and always 515 * recalculating it. 516 * 517 * NOTE: sc->next_packet is pointing at the current packet. 518 */ 519 if (packet_hdr.next_packet >= sc->next_packet) 520 nlen = (packet_hdr.next_packet - sc->next_packet); 521 else 522 nlen = ((packet_hdr.next_packet - sc->rec_page_start) + 523 (sc->rec_page_stop - sc->next_packet)); 524 --nlen; 525 if ((len & ED_PAGE_MASK) + sizeof(packet_hdr) > ED_PAGE_SIZE) 526 --nlen; 527 len = (len & ED_PAGE_MASK) | (nlen << ED_PAGE_SHIFT); 528 #ifdef DIAGNOSTIC 529 if (len != packet_hdr.count) { 530 printf("%s: length does not match next packet pointer\n", 531 sc->sc_dev.dv_xname); 532 printf("%s: len %04x nlen %04x start %02x first %02x curr %02x next %02x stop %02x\n", 533 sc->sc_dev.dv_xname, packet_hdr.count, len, 534 sc->rec_page_start, sc->next_packet, current, 535 packet_hdr.next_packet, sc->rec_page_stop); 536 } 537 #endif 538 539 /* 540 * Be fairly liberal about what we allow as a "reasonable" 541 * length so that a [crufty] packet will make it to BPF (and 542 * can thus be analyzed). Note that all that is really 543 * important is that we have a length that will fit into one 544 * mbuf cluster or less; the upper layer protocols can then 545 * figure out the length from their own length field(s). 546 */ 547 if (len <= MCLBYTES && 548 packet_hdr.next_packet >= sc->rec_page_start && 549 packet_hdr.next_packet < sc->rec_page_stop) { 550 /* Go get packet. */ 551 aeread(sc, packet_ptr + sizeof(struct ae_ring), 552 len - sizeof(struct ae_ring)); 553 ++sc->sc_arpcom.ac_if.if_ipackets; 554 } else { 555 /* Really BAD. The ring pointers are corrupted. */ 556 log(LOG_ERR, 557 "%s: NIC memory corrupt - invalid packet length %d\n", 558 sc->sc_dev.dv_xname, len); 559 ++sc->sc_arpcom.ac_if.if_ierrors; 560 aereset(sc); 561 return; 562 } 563 564 /* Update next packet pointer. */ 565 sc->next_packet = packet_hdr.next_packet; 566 567 /* 568 * Update NIC boundary pointer - being careful to keep it one 569 * buffer behind (as recommended by NS databook). 570 */ 571 boundary = sc->next_packet - 1; 572 if (boundary < sc->rec_page_start) 573 boundary = sc->rec_page_stop - 1; 574 NIC_PUT(sc, ED_P0_BNRY, boundary); 575 } while (sc->next_packet != current); 576 577 goto loop; 578 } 579 580 /* Ethernet interface interrupt processor. */ 581 void 582 aeintr(arg, slot) 583 void *arg; 584 int slot; 585 { 586 struct ae_softc *sc = (struct ae_softc *)arg; 587 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 588 u_char isr; 589 590 /* Set NIC to page 0 registers. */ 591 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 592 593 isr = NIC_GET(sc, ED_P0_ISR); 594 if (!isr) 595 return; 596 597 /* Loop until there are no more new interrupts. */ 598 for (;;) { 599 /* 600 * Reset all the bits that we are 'acknowledging' by writing a 601 * '1' to each bit position that was set. 602 * (Writing a '1' *clears* the bit.) 603 */ 604 NIC_PUT(sc, ED_P0_ISR, isr); 605 606 /* 607 * Handle transmitter interrupts. Handle these first because 608 * the receiver will reset the board under some conditions. 609 */ 610 if (isr & (ED_ISR_PTX | ED_ISR_TXE)) { 611 u_char collisions = NIC_GET(sc, ED_P0_NCR) & 0x0f; 612 613 /* 614 * Check for transmit error. If a TX completed with an 615 * error, we end up throwing the packet away. Really 616 * the only error that is possible is excessive 617 * collisions, and in this case it is best to allow the 618 * automatic mechanisms of TCP to backoff the flow. Of 619 * course, with UDP we're screwed, but this is expected 620 * when a network is heavily loaded. 621 */ 622 (void) NIC_GET(sc, ED_P0_TSR); 623 if (isr & ED_ISR_TXE) { 624 /* 625 * Excessive collisions (16). 626 */ 627 if ((NIC_GET(sc, ED_P0_TSR) & ED_TSR_ABT) 628 && (collisions == 0)) { 629 /* 630 * When collisions total 16, the P0_NCR 631 * will indicate 0, and the TSR_ABT is 632 * set. 633 */ 634 collisions = 16; 635 } 636 637 /* Update output errors counter. */ 638 ++ifp->if_oerrors; 639 } else { 640 /* 641 * Update total number of successfully 642 * transmitted packets. 643 */ 644 ++ifp->if_opackets; 645 } 646 647 /* Done with the buffer. */ 648 sc->txb_inuse--; 649 650 /* Clear watchdog timer. */ 651 ifp->if_timer = 0; 652 ifp->if_flags &= ~IFF_OACTIVE; 653 654 /* 655 * Add in total number of collisions on last 656 * transmission. 657 */ 658 ifp->if_collisions += collisions; 659 660 /* 661 * Decrement buffer in-use count if not zero (can only 662 * be zero if a transmitter interrupt occured while not 663 * actually transmitting). 664 * If data is ready to transmit, start it transmitting, 665 * otherwise defer until after handling receiver. 666 */ 667 if (sc->txb_inuse > 0) 668 ae_xmit(sc); 669 } 670 671 /* Handle receiver interrupts. */ 672 if (isr & (ED_ISR_PRX | ED_ISR_RXE | ED_ISR_OVW)) { 673 /* 674 * Overwrite warning. In order to make sure that a 675 * lockup of the local DMA hasn't occurred, we reset 676 * and re-init the NIC. The NSC manual suggests only a 677 * partial reset/re-init is necessary - but some chips 678 * seem to want more. The DMA lockup has been seen 679 * only with early rev chips - Methinks this bug was 680 * fixed in later revs. -DG 681 */ 682 if (isr & ED_ISR_OVW) { 683 ++ifp->if_ierrors; 684 #ifdef DIAGNOSTIC 685 log(LOG_WARNING, 686 "%s: warning - receiver ring buffer overrun\n", 687 sc->sc_dev.dv_xname); 688 #endif 689 /* Stop/reset/re-init NIC. */ 690 aereset(sc); 691 } else { 692 /* 693 * Receiver Error. One or more of: CRC error, 694 * frame alignment error FIFO overrun, or 695 * missed packet. 696 */ 697 if (isr & ED_ISR_RXE) { 698 ++ifp->if_ierrors; 699 #ifdef AE_DEBUG 700 printf("%s: receive error %x\n", 701 sc->sc_dev.dv_xname, 702 NIC_GET(sc, ED_P0_RSR)); 703 #endif 704 } 705 706 /* 707 * Go get the packet(s) 708 * XXX - Doing this on an error is dubious 709 * because there shouldn't be any data to get 710 * (we've configured the interface to not 711 * accept packets with errors). 712 */ 713 ae_rint(sc); 714 } 715 } 716 717 /* 718 * If it looks like the transmitter can take more data, attempt 719 * to start output on the interface. This is done after 720 * handling the receiver to give the receiver priority. 721 */ 722 aestart(ifp); 723 724 /* 725 * Return NIC CR to standard state: page 0, remote DMA 726 * complete, start (toggling the TXP bit off, even if was just 727 * set in the transmit routine, is *okay* - it is 'edge' 728 * triggered from low to high). 729 */ 730 NIC_PUT(sc, ED_P0_CR, sc->cr_proto | ED_CR_PAGE_0 | ED_CR_STA); 731 732 /* 733 * If the Network Talley Counters overflow, read them to reset 734 * them. It appears that old 8390's won't clear the ISR flag 735 * otherwise - resulting in an infinite loop. 736 */ 737 if (isr & ED_ISR_CNT) { 738 (void)NIC_GET(sc, ED_P0_CNTR0); 739 (void)NIC_GET(sc, ED_P0_CNTR1); 740 (void)NIC_GET(sc, ED_P0_CNTR2); 741 } 742 743 isr = NIC_GET(sc, ED_P0_ISR); 744 if (!isr) 745 return; 746 } 747 } 748 749 /* 750 * Process an ioctl request. This code needs some work - it looks pretty ugly. 751 */ 752 int 753 aeioctl(ifp, cmd, data) 754 register struct ifnet *ifp; 755 u_long cmd; 756 caddr_t data; 757 { 758 struct ae_softc *sc = ifp->if_softc; 759 register struct ifaddr *ifa = (struct ifaddr *) data; 760 struct ifreq *ifr = (struct ifreq *) data; 761 int s, error = 0; 762 763 s = splnet(); 764 765 switch (cmd) { 766 767 case SIOCSIFADDR: 768 ifp->if_flags |= IFF_UP; 769 770 switch (ifa->ifa_addr->sa_family) { 771 #ifdef INET 772 case AF_INET: 773 aeinit(sc); 774 arp_ifinit(&sc->sc_arpcom, ifa); 775 break; 776 #endif 777 #ifdef NS 778 /* XXX - This code is probably wrong. */ 779 case AF_NS: 780 { 781 register struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 782 783 if (ns_nullhost(*ina)) 784 ina->x_host = 785 *(union ns_host *) (sc->sc_arpcom.ac_enaddr); 786 else 787 bcopy(ina->x_host.c_host, 788 sc->sc_arpcom.ac_enaddr, 789 sizeof(sc->sc_arpcom.ac_enaddr)); 790 /* Set new address. */ 791 aeinit(sc); 792 break; 793 } 794 #endif 795 default: 796 aeinit(sc); 797 break; 798 } 799 break; 800 801 case SIOCSIFFLAGS: 802 if ((ifp->if_flags & IFF_UP) == 0 && 803 (ifp->if_flags & IFF_RUNNING) != 0) { 804 /* 805 * If interface is marked down and it is running, then 806 * stop it. 807 */ 808 aestop(sc); 809 ifp->if_flags &= ~IFF_RUNNING; 810 } else 811 if ((ifp->if_flags & IFF_UP) != 0 && 812 (ifp->if_flags & IFF_RUNNING) == 0) { 813 /* 814 * If interface is marked up and it is stopped, then 815 * start it. 816 */ 817 aeinit(sc); 818 } else { 819 /* 820 * Reset the interface to pick up changes in any other 821 * flags that affect hardware registers. 822 */ 823 aestop(sc); 824 aeinit(sc); 825 } 826 break; 827 828 case SIOCADDMULTI: 829 case SIOCDELMULTI: 830 /* Update our multicast list. */ 831 error = (cmd == SIOCADDMULTI) ? 832 ether_addmulti(ifr, &sc->sc_arpcom) : 833 ether_delmulti(ifr, &sc->sc_arpcom); 834 835 if (error == ENETRESET) { 836 /* 837 * Multicast list has changed; set the hardware filter 838 * accordingly. 839 */ 840 aestop(sc); /* XXX for ds_setmcaf? */ 841 aeinit(sc); 842 error = 0; 843 } 844 break; 845 846 default: 847 error = EINVAL; 848 break; 849 } 850 851 splx(s); 852 return (error); 853 } 854 855 /* 856 * Retreive packet from shared memory and send to the next level up via 857 * ether_input(). If there is a BPF listener, give a copy to BPF, too. 858 */ 859 void 860 aeread(sc, buf, len) 861 struct ae_softc *sc; 862 int buf; 863 int len; 864 { 865 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 866 struct mbuf *m; 867 struct ether_header *eh; 868 869 /* Pull packet off interface. */ 870 m = aeget(sc, buf, len); 871 if (m == 0) { 872 ifp->if_ierrors++; 873 return; 874 } 875 876 ifp->if_ipackets++; 877 878 /* We assume that the header fits entirely in one mbuf. */ 879 eh = mtod(m, struct ether_header *); 880 881 #if NBPFILTER > 0 882 /* 883 * Check if there's a BPF listener on this interface. 884 * If so, hand off the raw packet to bpf. 885 */ 886 if (ifp->if_bpf) { 887 bpf_mtap(ifp->if_bpf, m); 888 889 /* 890 * Note that the interface cannot be in promiscuous mode if 891 * there are no BPF listeners. And if we are in promiscuous 892 * mode, we have to check if this packet is really ours. 893 */ 894 if ((ifp->if_flags & IFF_PROMISC) && 895 (eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */ 896 bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr, 897 sizeof(eh->ether_dhost)) != 0) { 898 m_freem(m); 899 return; 900 } 901 } 902 #endif 903 904 /* Fix up data start offset in mbuf to point past ether header. */ 905 m_adj(m, sizeof(struct ether_header)); 906 ether_input(ifp, eh, m); 907 } 908 909 /* 910 * Supporting routines. 911 */ 912 /* 913 * Given a source and destination address, copy 'amount' of a packet from the 914 * ring buffer into a linear destination buffer. Takes into account ring-wrap. 915 */ 916 static inline int 917 ae_ring_copy(sc, src, dst, amount) 918 struct ae_softc *sc; 919 int src; 920 caddr_t dst; 921 int amount; 922 { 923 bus_space_tag_t bst = sc->sc_buft; 924 bus_space_handle_t bsh = sc->sc_bufh; 925 int tmp_amount; 926 927 /* Does copy wrap to lower addr in ring buffer? */ 928 if (src + amount > sc->mem_size) { 929 tmp_amount = sc->mem_size - src; 930 931 /* Copy amount up to end of NIC memory. */ 932 bus_space_read_region_1(bst, bsh, src, dst, tmp_amount); 933 934 amount -= tmp_amount; 935 src = sc->mem_ring; 936 dst += tmp_amount; 937 } 938 bus_space_read_region_1(bst, bsh, src, dst, amount); 939 940 return (src + amount); 941 } 942 943 /* 944 * Copy data from receive buffer to end of mbuf chain allocate additional mbufs 945 * as needed. Return pointer to last mbuf in chain. 946 * sc = ae info (softc) 947 * src = pointer in ae ring buffer 948 * dst = pointer to last mbuf in mbuf chain to copy to 949 * amount = amount of data to copy 950 */ 951 struct mbuf * 952 aeget(sc, src, total_len) 953 struct ae_softc *sc; 954 int src; 955 u_short total_len; 956 { 957 struct ifnet *ifp = &sc->sc_arpcom.ac_if; 958 struct mbuf *top, **mp, *m; 959 int len; 960 961 MGETHDR(m, M_DONTWAIT, MT_DATA); 962 if (m == 0) 963 return 0; 964 m->m_pkthdr.rcvif = ifp; 965 m->m_pkthdr.len = total_len; 966 len = MHLEN; 967 top = 0; 968 mp = ⊤ 969 970 while (total_len > 0) { 971 if (top) { 972 MGET(m, M_DONTWAIT, MT_DATA); 973 if (m == 0) { 974 m_freem(top); 975 return 0; 976 } 977 len = MLEN; 978 } 979 if (total_len >= MINCLSIZE) { 980 MCLGET(m, M_DONTWAIT); 981 if (m->m_flags & M_EXT) 982 len = MCLBYTES; 983 } 984 m->m_len = len = min(total_len, len); 985 src = ae_ring_copy(sc, src, mtod(m, caddr_t), len); 986 total_len -= len; 987 *mp = m; 988 mp = &m->m_next; 989 } 990 991 return top; 992 } 993 994 /* 995 * Compute the multicast address filter from the list of multicast addresses we 996 * need to listen to. 997 */ 998 void 999 ae_getmcaf(ac, af) 1000 struct arpcom *ac; 1001 u_char *af; 1002 { 1003 struct ifnet *ifp = &ac->ac_if; 1004 struct ether_multi *enm; 1005 register u_char *cp, c; 1006 register u_long crc; 1007 register int i, len; 1008 struct ether_multistep step; 1009 1010 /* 1011 * Set up multicast address filter by passing all multicast addresses 1012 * through a crc generator, and then using the high order 6 bits as an 1013 * index into the 64 bit logical address filter. The high order bit 1014 * selects the word, while the rest of the bits select the bit within 1015 * the word. 1016 */ 1017 1018 if (ifp->if_flags & IFF_PROMISC) { 1019 ifp->if_flags |= IFF_ALLMULTI; 1020 for (i = 0; i < 8; i++) 1021 af[i] = 0xff; 1022 return; 1023 } 1024 for (i = 0; i < 8; i++) 1025 af[i] = 0; 1026 ETHER_FIRST_MULTI(step, ac, enm); 1027 while (enm != NULL) { 1028 if (bcmp(enm->enm_addrlo, enm->enm_addrhi, 1029 sizeof(enm->enm_addrlo)) != 0) { 1030 /* 1031 * We must listen to a range of multicast addresses. 1032 * For now, just accept all multicasts, rather than 1033 * trying to set only those filter bits needed to match 1034 * the range. (At this time, the only use of address 1035 * ranges is for IP multicast routing, for which the 1036 * range is big enough to require all bits set.) 1037 */ 1038 ifp->if_flags |= IFF_ALLMULTI; 1039 for (i = 0; i < 8; i++) 1040 af[i] = 0xff; 1041 return; 1042 } 1043 cp = enm->enm_addrlo; 1044 crc = 0xffffffff; 1045 for (len = sizeof(enm->enm_addrlo); --len >= 0;) { 1046 c = *cp++; 1047 for (i = 8; --i >= 0;) { 1048 if (((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01)) { 1049 crc <<= 1; 1050 crc ^= 0x04c11db6 | 1; 1051 } else 1052 crc <<= 1; 1053 c >>= 1; 1054 } 1055 } 1056 /* Just want the 6 most significant bits. */ 1057 crc >>= 26; 1058 1059 /* Turn on the corresponding bit in the filter. */ 1060 af[crc >> 3] |= 1 << (crc & 0x7); 1061 1062 ETHER_NEXT_MULTI(step, enm); 1063 } 1064 ifp->if_flags &= ~IFF_ALLMULTI; 1065 } 1066 1067 /* 1068 * Copy packet from mbuf to the board memory 1069 * 1070 * Currently uses an extra buffer/extra memory copy, 1071 * unless the whole packet fits in one mbuf. 1072 * 1073 */ 1074 int 1075 ae_put(sc, m, buf) 1076 struct ae_softc *sc; 1077 struct mbuf *m; 1078 int buf; 1079 { 1080 u_char *data, savebyte[2]; 1081 int len, wantbyte; 1082 u_short totlen = 0; 1083 1084 wantbyte = 0; 1085 1086 for (; m ; m = m->m_next) { 1087 data = mtod(m, u_char *); 1088 len = m->m_len; 1089 totlen += len; 1090 if (len > 0) { 1091 /* Finish the last word. */ 1092 if (wantbyte) { 1093 savebyte[1] = *data; 1094 bus_space_write_region_2(sc->sc_buft, 1095 sc->sc_bufh, buf, savebyte, 1); 1096 buf += 2; 1097 data++; 1098 len--; 1099 wantbyte = 0; 1100 } 1101 /* Output contiguous words. */ 1102 if (len > 1) { 1103 bus_space_write_region_2(sc->sc_buft, 1104 sc->sc_bufh, buf, data, len >> 1); 1105 buf += len & ~1; 1106 data += len & ~1; 1107 len &= 1; 1108 } 1109 /* Save last byte, if necessary. */ 1110 if (len == 1) { 1111 savebyte[0] = *data; 1112 wantbyte = 1; 1113 } 1114 } 1115 } 1116 1117 if (wantbyte) { 1118 savebyte[1] = 0; 1119 bus_space_write_region_2(sc->sc_buft, sc->sc_bufh, 1120 buf, savebyte, 1); 1121 } 1122 return (totlen); 1123 } 1124
Indexes created Mon Sep 22 13:09:51 GMT 2025