| 1 | /* if_ec.c 4.19 82/06/20 */ |
| 2 | |
| 3 | #include "ec.h" |
| 4 | |
| 5 | /* |
| 6 | * 3Com Ethernet Controller interface |
| 7 | */ |
| 8 | |
| 9 | #include "../h/param.h" |
| 10 | #include "../h/systm.h" |
| 11 | #include "../h/mbuf.h" |
| 12 | #include "../h/pte.h" |
| 13 | #include "../h/buf.h" |
| 14 | #include "../h/protosw.h" |
| 15 | #include "../h/socket.h" |
| 16 | #include "../h/ubareg.h" |
| 17 | #include "../h/ubavar.h" |
| 18 | #include "../h/ecreg.h" |
| 19 | #include "../h/cpu.h" |
| 20 | #include "../h/mtpr.h" |
| 21 | #include "../h/vmmac.h" |
| 22 | #include "../net/in.h" |
| 23 | #include "../net/in_systm.h" |
| 24 | #include "../net/if.h" |
| 25 | #include "../net/if_ec.h" |
| 26 | #include "../net/if_uba.h" |
| 27 | #include "../net/ip.h" |
| 28 | #include "../net/ip_var.h" |
| 29 | #include "../net/pup.h" |
| 30 | #include "../net/route.h" |
| 31 | #include <errno.h> |
| 32 | |
| 33 | #define ECMTU 1500 |
| 34 | |
| 35 | int ecprobe(), ecattach(), ecrint(), ecxint(), eccollide(); |
| 36 | struct uba_device *ecinfo[NEC]; |
| 37 | u_short ecstd[] = { 0 }; |
| 38 | struct uba_driver ecdriver = |
| 39 | { ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo }; |
| 40 | u_char ec_iltop[3] = { 0x02, 0x07, 0x01 }; |
| 41 | #define ECUNIT(x) minor(x) |
| 42 | |
| 43 | int ecinit(),ecoutput(),ecreset(); |
| 44 | struct mbuf *ecget(); |
| 45 | |
| 46 | extern struct ifnet loif; |
| 47 | |
| 48 | /* |
| 49 | * Ethernet software status per interface. |
| 50 | * |
| 51 | * Each interface is referenced by a network interface structure, |
| 52 | * es_if, which the routing code uses to locate the interface. |
| 53 | * This structure contains the output queue for the interface, its address, ... |
| 54 | * We also have, for each interface, a UBA interface structure, which |
| 55 | * contains information about the UNIBUS resources held by the interface: |
| 56 | * map registers, buffered data paths, etc. Information is cached in this |
| 57 | * structure for use by the if_uba.c routines in running the interface |
| 58 | * efficiently. |
| 59 | */ |
| 60 | struct ec_softc { |
| 61 | struct ifnet es_if; /* network-visible interface */ |
| 62 | struct ifuba es_ifuba; /* UNIBUS resources */ |
| 63 | short es_mask; /* mask for current output delay */ |
| 64 | short es_oactive; /* is output active? */ |
| 65 | caddr_t es_buf[16]; /* virtual addresses of buffers */ |
| 66 | u_char es_enaddr[6]; /* board's ethernet address */ |
| 67 | } ec_softc[NEC]; |
| 68 | |
| 69 | /* |
| 70 | * Do output DMA to determine interface presence and |
| 71 | * interrupt vector. DMA is too short to disturb other hosts. |
| 72 | */ |
| 73 | ecprobe(reg) |
| 74 | caddr_t reg; |
| 75 | { |
| 76 | register int br, cvec; /* r11, r10 value-result */ |
| 77 | register struct ecdevice *addr = (struct ecdevice *)reg; |
| 78 | register caddr_t ecbuf = (caddr_t) &umem[0][0600000]; |
| 79 | |
| 80 | #ifdef lint |
| 81 | br = 0; cvec = br; br = cvec; |
| 82 | ecrint(0); ecxint(0); eccollide(0); |
| 83 | #endif |
| 84 | /* |
| 85 | * Make sure memory is turned on |
| 86 | */ |
| 87 | addr->ec_rcr = EC_AROM; |
| 88 | /* |
| 89 | * Check for existence of buffers on Unibus. |
| 90 | * This won't work on a 780 until more work is done. |
| 91 | */ |
| 92 | if (badaddr((caddr_t) ecbuf, 2)) { |
| 93 | printf("ec: buffer mem not found"); |
| 94 | return (0); |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Tell the system that the board has memory here, so it won't |
| 99 | * attempt to allocate the addresses later. |
| 100 | */ |
| 101 | ubamem(0, 0600000, 32*2); |
| 102 | |
| 103 | /* |
| 104 | * Make a one byte packet in what should be buffer #0. |
| 105 | * Submit it for sending. This whould cause an xmit interrupt. |
| 106 | * The xmit interrupt vector is 8 bytes after the receive vector, |
| 107 | * so adjust for this before returning. |
| 108 | */ |
| 109 | *(u_short *)ecbuf = (u_short) 03777; |
| 110 | ecbuf[03777] = '\0'; |
| 111 | addr->ec_xcr = EC_XINTEN|EC_XWBN; |
| 112 | DELAY(100000); |
| 113 | addr->ec_xcr = EC_XCLR; |
| 114 | if (cvec > 0 && cvec != 0x200) { |
| 115 | cvec -= 010; |
| 116 | br += 2; /* rcv is xmit + 2 */ |
| 117 | } |
| 118 | return (1); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Interface exists: make available by filling in network interface |
| 123 | * record. System will initialize the interface when it is ready |
| 124 | * to accept packets. |
| 125 | */ |
| 126 | ecattach(ui) |
| 127 | struct uba_device *ui; |
| 128 | { |
| 129 | struct ec_softc *es = &ec_softc[ui->ui_unit]; |
| 130 | register struct ifnet *ifp = &es->es_if; |
| 131 | register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr; |
| 132 | struct sockaddr_in *sin; |
| 133 | int i, j; |
| 134 | u_char *cp; |
| 135 | |
| 136 | ifp->if_unit = ui->ui_unit; |
| 137 | ifp->if_name = "ec"; |
| 138 | ifp->if_mtu = ECMTU; |
| 139 | ifp->if_net = ui->ui_flags; |
| 140 | |
| 141 | /* |
| 142 | * Read the ethernet address off the board, one nibble at a time. |
| 143 | */ |
| 144 | addr->ec_xcr = EC_UECLR; |
| 145 | addr->ec_rcr = EC_AROM; |
| 146 | cp = es->es_enaddr; |
| 147 | #define NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM |
| 148 | for (i=0; i<6; i++) { |
| 149 | *cp = 0; |
| 150 | for (j=0; j<=4; j+=4) { |
| 151 | *cp |= ((addr->ec_rcr >> 8) & 0xf) << j; |
| 152 | NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT; |
| 153 | } |
| 154 | cp++; |
| 155 | } |
| 156 | #ifdef notdef |
| 157 | printf("ec%d: addr=%x:%x:%x:%x:%x:%x\n", ui->ui_unit, |
| 158 | es->es_enaddr[0]&0xff, es->es_enaddr[1]&0xff, |
| 159 | es->es_enaddr[2]&0xff, es->es_enaddr[3]&0xff, |
| 160 | es->es_enaddr[4]&0xff, es->es_enaddr[5]&0xff); |
| 161 | #endif |
| 162 | ifp->if_host[0] = ((es->es_enaddr[3]&0xff)<<16) | |
| 163 | ((es->es_enaddr[4]&0xff)<<8) | (es->es_enaddr[5]&0xff); |
| 164 | sin = (struct sockaddr_in *)&es->es_if.if_addr; |
| 165 | sin->sin_family = AF_INET; |
| 166 | sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); |
| 167 | |
| 168 | sin = (struct sockaddr_in *)&ifp->if_broadaddr; |
| 169 | sin->sin_family = AF_INET; |
| 170 | sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); |
| 171 | ifp->if_flags = IFF_BROADCAST; |
| 172 | |
| 173 | ifp->if_init = ecinit; |
| 174 | ifp->if_output = ecoutput; |
| 175 | ifp->if_ubareset = ecreset; |
| 176 | for (i=0; i<16; i++) |
| 177 | es->es_buf[i] = &umem[ui->ui_ubanum][0600000+2048*i]; |
| 178 | if_attach(ifp); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Reset of interface after UNIBUS reset. |
| 183 | * If interface is on specified uba, reset its state. |
| 184 | */ |
| 185 | ecreset(unit, uban) |
| 186 | int unit, uban; |
| 187 | { |
| 188 | register struct uba_device *ui; |
| 189 | |
| 190 | if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 || |
| 191 | ui->ui_ubanum != uban) |
| 192 | return; |
| 193 | printf(" ec%d", unit); |
| 194 | ecinit(unit); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Initialization of interface; clear recorded pending |
| 199 | * operations, and reinitialize UNIBUS usage. |
| 200 | */ |
| 201 | ecinit(unit) |
| 202 | int unit; |
| 203 | { |
| 204 | struct ec_softc *es = &ec_softc[unit]; |
| 205 | struct ecdevice *addr; |
| 206 | int i, s; |
| 207 | |
| 208 | /* |
| 209 | * Hang receive buffers and start any pending writes. |
| 210 | * Writing into the rcr also makes sure the memory |
| 211 | * is turned on. |
| 212 | */ |
| 213 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 214 | s = splimp(); |
| 215 | for (i=ECRHBF; i>=ECRLBF; i--) |
| 216 | addr->ec_rcr = EC_READ|i; |
| 217 | es->es_oactive = 0; |
| 218 | es->es_mask = ~0; |
| 219 | es->es_if.if_flags |= IFF_UP; |
| 220 | if (es->es_if.if_snd.ifq_head) |
| 221 | ecstart(unit); |
| 222 | splx(s); |
| 223 | if_rtinit(&es->es_if, RTF_UP); |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Start or restart output on interface. |
| 228 | * If interface is already active, then this is a retransmit |
| 229 | * after a collision, and just restuff registers. |
| 230 | * If interface is not already active, get another datagram |
| 231 | * to send off of the interface queue, and map it to the interface |
| 232 | * before starting the output. |
| 233 | */ |
| 234 | ecstart(dev) |
| 235 | dev_t dev; |
| 236 | { |
| 237 | int unit = ECUNIT(dev), dest; |
| 238 | struct ec_softc *es = &ec_softc[unit]; |
| 239 | struct ecdevice *addr; |
| 240 | struct mbuf *m; |
| 241 | caddr_t ecbuf; |
| 242 | |
| 243 | if (es->es_oactive) |
| 244 | goto restart; |
| 245 | |
| 246 | IF_DEQUEUE(&es->es_if.if_snd, m); |
| 247 | if (m == 0) { |
| 248 | es->es_oactive = 0; |
| 249 | return; |
| 250 | } |
| 251 | ecput(es->es_buf[ECTBF], m); |
| 252 | |
| 253 | restart: |
| 254 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 255 | addr->ec_xcr = EC_WRITE|ECTBF; |
| 256 | es->es_oactive = 1; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Ethernet interface transmitter interrupt. |
| 261 | * Start another output if more data to send. |
| 262 | */ |
| 263 | ecxint(unit) |
| 264 | int unit; |
| 265 | { |
| 266 | register struct ec_softc *es = &ec_softc[unit]; |
| 267 | register struct ecdevice *addr = |
| 268 | (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 269 | |
| 270 | if (es->es_oactive == 0) |
| 271 | return; |
| 272 | if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) { |
| 273 | printf("ec%d: stray xmit interrupt, xcr=%b\n", unit, |
| 274 | addr->ec_xcr, EC_XBITS); |
| 275 | es->es_oactive = 0; |
| 276 | addr->ec_xcr = EC_XCLR; |
| 277 | return; |
| 278 | } |
| 279 | es->es_if.if_opackets++; |
| 280 | es->es_oactive = 0; |
| 281 | es->es_mask = ~0; |
| 282 | addr->ec_xcr = EC_XCLR; |
| 283 | /* |
| 284 | * There shouldn't ever be any mbuf's to free, but just in case... |
| 285 | */ |
| 286 | if (es->es_ifuba.ifu_xtofree) { |
| 287 | m_freem(es->es_ifuba.ifu_xtofree); |
| 288 | es->es_ifuba.ifu_xtofree = 0; |
| 289 | } |
| 290 | if (es->es_if.if_snd.ifq_head) |
| 291 | ecstart(unit); |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Collision on ethernet interface. Do exponential |
| 296 | * backoff, and retransmit. If have backed off all |
| 297 | * the way print warning diagnostic, and drop packet. |
| 298 | */ |
| 299 | eccollide(unit) |
| 300 | int unit; |
| 301 | { |
| 302 | struct ec_softc *es = &ec_softc[unit]; |
| 303 | |
| 304 | printf("ec%d: collision\n", unit); |
| 305 | es->es_if.if_collisions++; |
| 306 | if (es->es_oactive) |
| 307 | ecdocoll(unit); |
| 308 | } |
| 309 | |
| 310 | ecdocoll(unit) |
| 311 | int unit; |
| 312 | { |
| 313 | register struct ec_softc *es = &ec_softc[unit]; |
| 314 | register struct ecdevice *addr = |
| 315 | (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 316 | register i; |
| 317 | int delay; |
| 318 | |
| 319 | /* |
| 320 | * Es_mask is a 16 bit number with n low zero bits, with |
| 321 | * n the number of backoffs. When es_mask is 0 we have |
| 322 | * backed off 16 times, and give up. |
| 323 | */ |
| 324 | if (es->es_mask == 0) { |
| 325 | es->es_if.if_oerrors++; |
| 326 | printf("ec%d: send error\n", unit); |
| 327 | /* |
| 328 | * Reset interface, then requeue rcv buffers. |
| 329 | * Some incoming packets may be lost, but that |
| 330 | * can't be helped. |
| 331 | */ |
| 332 | addr->ec_xcr = EC_UECLR; |
| 333 | for (i=ECRHBF; i>=ECRLBF; i--) |
| 334 | addr->ec_rcr = EC_READ|i; |
| 335 | /* |
| 336 | * Reset and transmit next packet (if any). |
| 337 | */ |
| 338 | es->es_oactive = 0; |
| 339 | es->es_mask = ~0; |
| 340 | if (es->es_if.if_snd.ifq_head) |
| 341 | ecstart(unit); |
| 342 | return; |
| 343 | } |
| 344 | /* |
| 345 | * Do exponential backoff. Compute delay based on low bits |
| 346 | * of the interval timer. Then delay for that number of |
| 347 | * slot times. A slot time is 51.2 microseconds (rounded to 51). |
| 348 | * This does not take into account the time already used to |
| 349 | * process the interrupt. |
| 350 | */ |
| 351 | es->es_mask <<= 1; |
| 352 | delay = mfpr(ICR) &~ es->es_mask; |
| 353 | DELAY(delay * 51); |
| 354 | /* |
| 355 | * Clear the controller's collision flag, thus enabling retransmit. |
| 356 | */ |
| 357 | addr->ec_xcr = EC_JINTEN|EC_XINTEN|EC_JCLR; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Ethernet interface receiver interrupt. |
| 362 | * If input error just drop packet. |
| 363 | * Otherwise purge input buffered data path and examine |
| 364 | * packet to determine type. If can't determine length |
| 365 | * from type, then have to drop packet. Othewise decapsulate |
| 366 | * packet based on type and pass to type specific higher-level |
| 367 | * input routine. |
| 368 | */ |
| 369 | ecrint(unit) |
| 370 | int unit; |
| 371 | { |
| 372 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 373 | |
| 374 | while (addr->ec_rcr & EC_RDONE) |
| 375 | ecread(unit); |
| 376 | } |
| 377 | |
| 378 | ecread(unit) |
| 379 | int unit; |
| 380 | { |
| 381 | register struct ec_softc *es = &ec_softc[unit]; |
| 382 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 383 | register struct ec_header *ec; |
| 384 | struct mbuf *m; |
| 385 | int len, off, resid, ecoff, buf; |
| 386 | register struct ifqueue *inq; |
| 387 | caddr_t ecbuf; |
| 388 | |
| 389 | es->es_if.if_ipackets++; |
| 390 | buf = addr->ec_rcr & EC_RBN; |
| 391 | if (buf < ECRLBF || buf > ECRHBF) |
| 392 | panic("ecrint"); |
| 393 | ecbuf = es->es_buf[buf]; |
| 394 | ecoff = *(short *)ecbuf; |
| 395 | if (ecoff <= ECRDOFF || ecoff > 2046) { |
| 396 | es->es_if.if_ierrors++; |
| 397 | #ifdef notdef |
| 398 | if (es->es_if.if_ierrors % 100 == 0) |
| 399 | printf("ec%d: += 100 input errors\n", unit); |
| 400 | #endif |
| 401 | printf("ec%d: input error (offset=%d)\n", unit, ecoff); |
| 402 | goto setup; |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * Get input data length. |
| 407 | * Get pointer to ethernet header (in input buffer). |
| 408 | * Deal with trailer protocol: if type is PUP trailer |
| 409 | * get true type from first 16-bit word past data. |
| 410 | * Remember that type was trailer by setting off. |
| 411 | */ |
| 412 | len = ecoff - ECRDOFF - sizeof (struct ec_header); |
| 413 | ec = (struct ec_header *)(ecbuf + ECRDOFF); |
| 414 | #define ecdataaddr(ec, off, type) ((type)(((caddr_t)((ec)+1)+(off)))) |
| 415 | if (ec->ec_type >= ECPUP_TRAIL && |
| 416 | ec->ec_type < ECPUP_TRAIL+ECPUP_NTRAILER) { |
| 417 | off = (ec->ec_type - ECPUP_TRAIL) * 512; |
| 418 | if (off >= ECMTU) |
| 419 | goto setup; /* sanity */ |
| 420 | ec->ec_type = *ecdataaddr(ec, off, u_short *); |
| 421 | resid = *(ecdataaddr(ec, off+2, u_short *)); |
| 422 | if (off + resid > len) |
| 423 | goto setup; /* sanity */ |
| 424 | len = off + resid; |
| 425 | } else |
| 426 | off = 0; |
| 427 | if (len == 0) |
| 428 | goto setup; |
| 429 | |
| 430 | /* |
| 431 | * Pull packet off interface. Off is nonzero if packet |
| 432 | * has trailing header; ecget will then force this header |
| 433 | * information to be at the front, but we still have to drop |
| 434 | * the type and length which are at the front of any trailer data. |
| 435 | */ |
| 436 | m = ecget(ecbuf, len, off); |
| 437 | if (m == 0) |
| 438 | goto setup; |
| 439 | if (off) { |
| 440 | m->m_off += 2 * sizeof (u_short); |
| 441 | m->m_len -= 2 * sizeof (u_short); |
| 442 | } |
| 443 | switch (ec->ec_type) { |
| 444 | |
| 445 | #ifdef INET |
| 446 | case ECPUP_IPTYPE: |
| 447 | schednetisr(NETISR_IP); |
| 448 | inq = &ipintrq; |
| 449 | break; |
| 450 | #endif |
| 451 | default: |
| 452 | m_freem(m); |
| 453 | goto setup; |
| 454 | } |
| 455 | |
| 456 | if (IF_QFULL(inq)) { |
| 457 | IF_DROP(inq); |
| 458 | m_freem(m); |
| 459 | goto setup; |
| 460 | } |
| 461 | IF_ENQUEUE(inq, m); |
| 462 | |
| 463 | setup: |
| 464 | /* |
| 465 | * Reset for next packet. |
| 466 | */ |
| 467 | addr->ec_rcr = EC_READ|EC_RCLR|buf; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * Ethernet output routine. |
| 472 | * Encapsulate a packet of type family for the local net. |
| 473 | * Use trailer local net encapsulation if enough data in first |
| 474 | * packet leaves a multiple of 512 bytes of data in remainder. |
| 475 | * If destination is this address or broadcast, send packet to |
| 476 | * loop device to kludge around the fact that 3com interfaces can't |
| 477 | * talk to themselves. |
| 478 | */ |
| 479 | ecoutput(ifp, m0, dst) |
| 480 | struct ifnet *ifp; |
| 481 | struct mbuf *m0; |
| 482 | struct sockaddr *dst; |
| 483 | { |
| 484 | int type, dest, s, error; |
| 485 | register struct ec_softc *es = &ec_softc[ifp->if_unit]; |
| 486 | register struct mbuf *m = m0; |
| 487 | register struct ec_header *ec; |
| 488 | register int off, i; |
| 489 | struct mbuf *mcopy = (struct mbuf *) 0; /* Null */ |
| 490 | |
| 491 | switch (dst->sa_family) { |
| 492 | |
| 493 | #ifdef INET |
| 494 | case AF_INET: |
| 495 | dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; |
| 496 | if ((dest &~ 0xff) == 0) |
| 497 | mcopy = m_copy(m, 0, M_COPYALL); |
| 498 | else if (dest == ((struct sockaddr_in *)&es->es_if.if_addr)-> |
| 499 | sin_addr.s_addr) { |
| 500 | mcopy = m; |
| 501 | goto gotlocal; |
| 502 | } |
| 503 | off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; |
| 504 | if (off > 0 && (off & 0x1ff) == 0 && |
| 505 | m->m_off >= MMINOFF + 2 * sizeof (u_short)) { |
| 506 | type = ECPUP_TRAIL + (off>>9); |
| 507 | m->m_off -= 2 * sizeof (u_short); |
| 508 | m->m_len += 2 * sizeof (u_short); |
| 509 | *mtod(m, u_short *) = ECPUP_IPTYPE; |
| 510 | *(mtod(m, u_short *) + 1) = m->m_len; |
| 511 | goto gottrailertype; |
| 512 | } |
| 513 | type = ECPUP_IPTYPE; |
| 514 | off = 0; |
| 515 | goto gottype; |
| 516 | #endif |
| 517 | |
| 518 | default: |
| 519 | printf("ec%d: can't handle af%d\n", ifp->if_unit, |
| 520 | dst->sa_family); |
| 521 | error = EAFNOSUPPORT; |
| 522 | goto bad; |
| 523 | } |
| 524 | |
| 525 | gottrailertype: |
| 526 | /* |
| 527 | * Packet to be sent as trailer: move first packet |
| 528 | * (control information) to end of chain. |
| 529 | */ |
| 530 | while (m->m_next) |
| 531 | m = m->m_next; |
| 532 | m->m_next = m0; |
| 533 | m = m0->m_next; |
| 534 | m0->m_next = 0; |
| 535 | m0 = m; |
| 536 | |
| 537 | gottype: |
| 538 | /* |
| 539 | * Add local net header. If no space in first mbuf, |
| 540 | * allocate another. |
| 541 | */ |
| 542 | if (m->m_off > MMAXOFF || |
| 543 | MMINOFF + sizeof (struct ec_header) > m->m_off) { |
| 544 | m = m_get(M_DONTWAIT); |
| 545 | if (m == 0) { |
| 546 | error = ENOBUFS; |
| 547 | goto bad; |
| 548 | } |
| 549 | m->m_next = m0; |
| 550 | m->m_off = MMINOFF; |
| 551 | m->m_len = sizeof (struct ec_header); |
| 552 | } else { |
| 553 | m->m_off -= sizeof (struct ec_header); |
| 554 | m->m_len += sizeof (struct ec_header); |
| 555 | } |
| 556 | ec = mtod(m, struct ec_header *); |
| 557 | for (i=0; i<6; i++) |
| 558 | ec->ec_shost[i] = es->es_enaddr[i]; |
| 559 | if ((dest &~ 0xff) == 0) |
| 560 | /* broadcast address */ |
| 561 | for (i=0; i<6; i++) |
| 562 | ec->ec_dhost[i] = 0xff; |
| 563 | else { |
| 564 | if (dest & 0x8000) { |
| 565 | ec->ec_dhost[0] = ec_iltop[0]; |
| 566 | ec->ec_dhost[1] = ec_iltop[1]; |
| 567 | ec->ec_dhost[2] = ec_iltop[2]; |
| 568 | } else { |
| 569 | ec->ec_dhost[0] = es->es_enaddr[0]; |
| 570 | ec->ec_dhost[1] = es->es_enaddr[1]; |
| 571 | ec->ec_dhost[2] = es->es_enaddr[2]; |
| 572 | } |
| 573 | ec->ec_dhost[3] = (dest>>8) & 0x7f; |
| 574 | ec->ec_dhost[4] = (dest>>16) & 0xff; |
| 575 | ec->ec_dhost[5] = (dest>>24) & 0xff; |
| 576 | } |
| 577 | ec->ec_type = type; |
| 578 | |
| 579 | /* |
| 580 | * Queue message on interface, and start output if interface |
| 581 | * not yet active. |
| 582 | */ |
| 583 | s = splimp(); |
| 584 | if (IF_QFULL(&ifp->if_snd)) { |
| 585 | IF_DROP(&ifp->if_snd); |
| 586 | error = ENOBUFS; |
| 587 | goto qfull; |
| 588 | } |
| 589 | IF_ENQUEUE(&ifp->if_snd, m); |
| 590 | if (es->es_oactive == 0) |
| 591 | ecstart(ifp->if_unit); |
| 592 | splx(s); |
| 593 | |
| 594 | gotlocal: |
| 595 | return(mcopy ? looutput(&loif, mcopy, dst) : 0); |
| 596 | |
| 597 | qfull: |
| 598 | m0 = m; |
| 599 | splx(s); |
| 600 | bad: |
| 601 | m_freem(m0); |
| 602 | return(error); |
| 603 | } |
| 604 | |
| 605 | /* |
| 606 | * Routine to copy from mbuf chain to transmitter |
| 607 | * buffer in UNIBUS memory. |
| 608 | */ |
| 609 | ecput(ecbuf, m) |
| 610 | u_char *ecbuf; |
| 611 | struct mbuf *m; |
| 612 | { |
| 613 | register struct mbuf *mp; |
| 614 | register u_char *bp; |
| 615 | register int off; |
| 616 | |
| 617 | for (off = 2048, mp = m; mp; mp = mp->m_next) |
| 618 | off -= mp->m_len; |
| 619 | *(u_short *)ecbuf = off; |
| 620 | bp = (u_char *)(ecbuf + off); |
| 621 | for (mp = m; mp; mp = m_free(mp)) { |
| 622 | register unsigned len; |
| 623 | register u_char *mcp; |
| 624 | |
| 625 | len = mp->m_len; |
| 626 | if (len == 0) |
| 627 | continue; |
| 628 | mcp = mtod(mp, u_char *); |
| 629 | if ((unsigned)bp & 01) { |
| 630 | *bp++ = *mcp++; |
| 631 | len--; |
| 632 | } |
| 633 | for (; len > 1; len -= sizeof (u_short)) { |
| 634 | *(u_short *)bp = *(u_short *)mcp; |
| 635 | bp += sizeof (u_short); |
| 636 | mcp += sizeof (u_short); |
| 637 | } |
| 638 | if (len) |
| 639 | *bp++ = *mcp++; |
| 640 | } |
| 641 | #ifdef notdef |
| 642 | if (bp - ecbuf != 2048) |
| 643 | printf("ec: bad ecput, diff=%d\n", bp-ecbuf); |
| 644 | #endif |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Routine to copy from UNIBUS memory into mbufs. |
| 649 | * Similar in spirit to if_rubaget. |
| 650 | * |
| 651 | * Warning: This makes the fairly safe assumption that |
| 652 | * mbufs have even lengths. |
| 653 | */ |
| 654 | struct mbuf * |
| 655 | ecget(ecbuf, totlen, off0) |
| 656 | char *ecbuf; |
| 657 | int totlen, off0; |
| 658 | { |
| 659 | struct mbuf *top, **mp, *m; |
| 660 | int off = off0, len; |
| 661 | register char *cp, *mcp; |
| 662 | register int i; |
| 663 | |
| 664 | top = 0; |
| 665 | mp = ⊤ |
| 666 | cp = ecbuf + ECRDOFF + sizeof (struct ec_header); |
| 667 | while (totlen > 0) { |
| 668 | MGET(m, 0); |
| 669 | if (m == 0) |
| 670 | goto bad; |
| 671 | if (off) { |
| 672 | len = totlen - off; |
| 673 | cp = ecbuf + ECRDOFF + sizeof (struct ec_header) + off; |
| 674 | } else |
| 675 | len = totlen; |
| 676 | if (len >= CLBYTES) { |
| 677 | struct mbuf *p; |
| 678 | |
| 679 | MCLGET(p, 1); |
| 680 | if (p != 0) { |
| 681 | m->m_len = len = CLBYTES; |
| 682 | m->m_off = (int)p - (int)m; |
| 683 | } else { |
| 684 | m->m_len = len = MIN(MLEN, len); |
| 685 | m->m_off = MMINOFF; |
| 686 | } |
| 687 | } else { |
| 688 | m->m_len = len = MIN(MLEN, len); |
| 689 | m->m_off = MMINOFF; |
| 690 | } |
| 691 | mcp = mtod(m, char *); |
| 692 | for (i = 0; i < len; i += sizeof (short)) { |
| 693 | *(short *)mcp = *(short *)cp; |
| 694 | mcp += sizeof (short); |
| 695 | cp += sizeof (short); |
| 696 | } |
| 697 | if (len & 01) |
| 698 | *mcp++ = *cp++; |
| 699 | *mp = m; |
| 700 | mp = &m->m_next; |
| 701 | if (off) { |
| 702 | off += len; |
| 703 | if (off == totlen) { |
| 704 | cp = ecbuf + ECRDOFF + |
| 705 | sizeof (struct ec_header); |
| 706 | off = 0; |
| 707 | totlen = off0; |
| 708 | } |
| 709 | } else |
| 710 | totlen -= len; |
| 711 | } |
| 712 | return (top); |
| 713 | bad: |
| 714 | m_freem(top); |
| 715 | return (0); |
| 716 | } |