| 1 | /* if_ec.c 4.24 82/10/10 */ |
| 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/vmmac.h" |
| 17 | #include <errno.h> |
| 18 | |
| 19 | #include "../net/if.h" |
| 20 | #include "../net/netisr.h" |
| 21 | #include "../net/route.h" |
| 22 | #include "../netinet/in.h" |
| 23 | #include "../netinet/in_systm.h" |
| 24 | #include "../netinet/ip.h" |
| 25 | #include "../netinet/ip_var.h" |
| 26 | #include "../netpup/pup.h" |
| 27 | |
| 28 | #include "../vax/cpu.h" |
| 29 | #include "../vax/mtpr.h" |
| 30 | #include "../vaxif/if_ec.h" |
| 31 | #include "../vaxif/if_ecreg.h" |
| 32 | #include "../vaxif/if_uba.h" |
| 33 | #include "../vaxuba/ubareg.h" |
| 34 | #include "../vaxuba/ubavar.h" |
| 35 | |
| 36 | #define ECMTU 1500 |
| 37 | #define ECMEM 0000000 |
| 38 | |
| 39 | int ecprobe(), ecattach(), ecrint(), ecxint(), eccollide(); |
| 40 | struct uba_device *ecinfo[NEC]; |
| 41 | u_short ecstd[] = { 0 }; |
| 42 | struct uba_driver ecdriver = |
| 43 | { ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo }; |
| 44 | u_char ec_iltop[3] = { 0x02, 0x07, 0x01 }; |
| 45 | #define ECUNIT(x) minor(x) |
| 46 | |
| 47 | int ecinit(),ecoutput(),ecreset(); |
| 48 | struct mbuf *ecget(); |
| 49 | |
| 50 | extern struct ifnet loif; |
| 51 | |
| 52 | /* |
| 53 | * Ethernet software status per interface. |
| 54 | * |
| 55 | * Each interface is referenced by a network interface structure, |
| 56 | * es_if, which the routing code uses to locate the interface. |
| 57 | * This structure contains the output queue for the interface, its address, ... |
| 58 | * We also have, for each interface, a UBA interface structure, which |
| 59 | * contains information about the UNIBUS resources held by the interface: |
| 60 | * map registers, buffered data paths, etc. Information is cached in this |
| 61 | * structure for use by the if_uba.c routines in running the interface |
| 62 | * efficiently. |
| 63 | */ |
| 64 | struct ec_softc { |
| 65 | struct ifnet es_if; /* network-visible interface */ |
| 66 | struct ifuba es_ifuba; /* UNIBUS resources */ |
| 67 | short es_mask; /* mask for current output delay */ |
| 68 | short es_oactive; /* is output active? */ |
| 69 | caddr_t es_buf[16]; /* virtual addresses of buffers */ |
| 70 | u_char es_enaddr[6]; /* board's ethernet address */ |
| 71 | } ec_softc[NEC]; |
| 72 | |
| 73 | /* |
| 74 | * Do output DMA to determine interface presence and |
| 75 | * interrupt vector. DMA is too short to disturb other hosts. |
| 76 | */ |
| 77 | ecprobe(reg) |
| 78 | caddr_t reg; |
| 79 | { |
| 80 | register int br, cvec; /* r11, r10 value-result */ |
| 81 | register struct ecdevice *addr = (struct ecdevice *)reg; |
| 82 | register caddr_t ecbuf = (caddr_t) &umem[numuba][ECMEM]; |
| 83 | |
| 84 | #ifdef lint |
| 85 | br = 0; cvec = br; br = cvec; |
| 86 | ecrint(0); ecxint(0); eccollide(0); |
| 87 | #endif |
| 88 | /* |
| 89 | * Make sure memory is turned on |
| 90 | */ |
| 91 | addr->ec_rcr = EC_AROM; |
| 92 | /* |
| 93 | * Disable map registers for ec unibus space, |
| 94 | * but don't allocate yet. |
| 95 | */ |
| 96 | ubamem(numuba, ECMEM, 32*2, 0); |
| 97 | /* |
| 98 | * Check for existence of buffers on Unibus. |
| 99 | */ |
| 100 | if (badaddr((caddr_t) ecbuf, 2)) { |
| 101 | bad1: |
| 102 | printf("ec: buffer mem not found\n"); |
| 103 | bad2: |
| 104 | ubamem(numuba, 0, 0, 0); /* reenable map (780 only) */ |
| 105 | addr->ec_rcr = EC_MDISAB; /* disable memory */ |
| 106 | return (0); |
| 107 | } |
| 108 | #if VAX780 |
| 109 | if (cpu == VAX_780 && uba_hd[numuba].uh_uba->uba_sr) { |
| 110 | uba_hd[numuba].uh_uba->uba_sr = uba_hd[numuba].uh_uba->uba_sr; |
| 111 | goto bad1; |
| 112 | } |
| 113 | #endif |
| 114 | |
| 115 | /* |
| 116 | * Tell the system that the board has memory here, so it won't |
| 117 | * attempt to allocate the addresses later. |
| 118 | */ |
| 119 | if (ubamem(numuba, ECMEM, 32*2, 1) == 0) { |
| 120 | printf("ecprobe: cannot reserve uba addresses\n"); |
| 121 | goto bad2; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Make a one byte packet in what should be buffer #0. |
| 126 | * Submit it for sending. This whould cause an xmit interrupt. |
| 127 | * The xmit interrupt vector is 8 bytes after the receive vector, |
| 128 | * so adjust for this before returning. |
| 129 | */ |
| 130 | *(u_short *)ecbuf = (u_short) 03777; |
| 131 | ecbuf[03777] = '\0'; |
| 132 | addr->ec_xcr = EC_XINTEN|EC_XWBN; |
| 133 | DELAY(100000); |
| 134 | addr->ec_xcr = EC_XCLR; |
| 135 | if (cvec > 0 && cvec != 0x200) { |
| 136 | if (cvec & 04) { /* collision interrupt */ |
| 137 | cvec -= 04; |
| 138 | br += 1; /* rcv is collision + 1 */ |
| 139 | } else { /* xmit interrupt */ |
| 140 | cvec -= 010; |
| 141 | br += 2; /* rcv is xmit + 2 */ |
| 142 | } |
| 143 | } |
| 144 | return (1); |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Interface exists: make available by filling in network interface |
| 149 | * record. System will initialize the interface when it is ready |
| 150 | * to accept packets. |
| 151 | */ |
| 152 | ecattach(ui) |
| 153 | struct uba_device *ui; |
| 154 | { |
| 155 | struct ec_softc *es = &ec_softc[ui->ui_unit]; |
| 156 | register struct ifnet *ifp = &es->es_if; |
| 157 | register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr; |
| 158 | struct sockaddr_in *sin; |
| 159 | int i, j; |
| 160 | u_char *cp; |
| 161 | |
| 162 | ifp->if_unit = ui->ui_unit; |
| 163 | ifp->if_name = "ec"; |
| 164 | ifp->if_mtu = ECMTU; |
| 165 | ifp->if_net = ui->ui_flags; |
| 166 | |
| 167 | /* |
| 168 | * Read the ethernet address off the board, one nibble at a time. |
| 169 | */ |
| 170 | addr->ec_xcr = EC_UECLR; |
| 171 | addr->ec_rcr = EC_AROM; |
| 172 | cp = es->es_enaddr; |
| 173 | #define NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM |
| 174 | for (i=0; i<6; i++) { |
| 175 | *cp = 0; |
| 176 | for (j=0; j<=4; j+=4) { |
| 177 | *cp |= ((addr->ec_rcr >> 8) & 0xf) << j; |
| 178 | NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT; |
| 179 | } |
| 180 | cp++; |
| 181 | } |
| 182 | #ifdef notdef |
| 183 | printf("ec%d: addr=%x:%x:%x:%x:%x:%x\n", ui->ui_unit, |
| 184 | es->es_enaddr[0]&0xff, es->es_enaddr[1]&0xff, |
| 185 | es->es_enaddr[2]&0xff, es->es_enaddr[3]&0xff, |
| 186 | es->es_enaddr[4]&0xff, es->es_enaddr[5]&0xff); |
| 187 | #endif |
| 188 | ifp->if_host[0] = ((es->es_enaddr[3]&0xff)<<16) | |
| 189 | ((es->es_enaddr[4]&0xff)<<8) | (es->es_enaddr[5]&0xff); |
| 190 | sin = (struct sockaddr_in *)&es->es_if.if_addr; |
| 191 | sin->sin_family = AF_INET; |
| 192 | sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]); |
| 193 | |
| 194 | sin = (struct sockaddr_in *)&ifp->if_broadaddr; |
| 195 | sin->sin_family = AF_INET; |
| 196 | sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); |
| 197 | ifp->if_flags = IFF_BROADCAST; |
| 198 | |
| 199 | ifp->if_init = ecinit; |
| 200 | ifp->if_output = ecoutput; |
| 201 | ifp->if_ubareset = ecreset; |
| 202 | for (i=0; i<16; i++) |
| 203 | es->es_buf[i] = &umem[ui->ui_ubanum][ECMEM+2048*i]; |
| 204 | if_attach(ifp); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Reset of interface after UNIBUS reset. |
| 209 | * If interface is on specified uba, reset its state. |
| 210 | */ |
| 211 | ecreset(unit, uban) |
| 212 | int unit, uban; |
| 213 | { |
| 214 | register struct uba_device *ui; |
| 215 | |
| 216 | if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 || |
| 217 | ui->ui_ubanum != uban) |
| 218 | return; |
| 219 | printf(" ec%d", unit); |
| 220 | ubamem(uban, ECMEM, 32*2, 0); /* map register disable (no alloc) */ |
| 221 | ecinit(unit); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Initialization of interface; clear recorded pending |
| 226 | * operations, and reinitialize UNIBUS usage. |
| 227 | */ |
| 228 | ecinit(unit) |
| 229 | int unit; |
| 230 | { |
| 231 | struct ec_softc *es = &ec_softc[unit]; |
| 232 | struct ecdevice *addr; |
| 233 | int i, s; |
| 234 | |
| 235 | /* |
| 236 | * Hang receive buffers and start any pending writes. |
| 237 | * Writing into the rcr also makes sure the memory |
| 238 | * is turned on. |
| 239 | */ |
| 240 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 241 | s = splimp(); |
| 242 | for (i=ECRHBF; i>=ECRLBF; i--) |
| 243 | addr->ec_rcr = EC_READ|i; |
| 244 | es->es_oactive = 0; |
| 245 | es->es_mask = ~0; |
| 246 | es->es_if.if_flags |= IFF_UP; |
| 247 | if (es->es_if.if_snd.ifq_head) |
| 248 | ecstart(unit); |
| 249 | splx(s); |
| 250 | if_rtinit(&es->es_if, RTF_UP); |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Start or restart output on interface. |
| 255 | * If interface is already active, then this is a retransmit |
| 256 | * after a collision, and just restuff registers. |
| 257 | * If interface is not already active, get another datagram |
| 258 | * to send off of the interface queue, and map it to the interface |
| 259 | * before starting the output. |
| 260 | */ |
| 261 | ecstart(dev) |
| 262 | dev_t dev; |
| 263 | { |
| 264 | int unit = ECUNIT(dev), dest; |
| 265 | struct ec_softc *es = &ec_softc[unit]; |
| 266 | struct ecdevice *addr; |
| 267 | struct mbuf *m; |
| 268 | caddr_t ecbuf; |
| 269 | |
| 270 | if (es->es_oactive) |
| 271 | goto restart; |
| 272 | |
| 273 | IF_DEQUEUE(&es->es_if.if_snd, m); |
| 274 | if (m == 0) { |
| 275 | es->es_oactive = 0; |
| 276 | return; |
| 277 | } |
| 278 | ecput(es->es_buf[ECTBF], m); |
| 279 | |
| 280 | restart: |
| 281 | addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 282 | addr->ec_xcr = EC_WRITE|ECTBF; |
| 283 | es->es_oactive = 1; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Ethernet interface transmitter interrupt. |
| 288 | * Start another output if more data to send. |
| 289 | */ |
| 290 | ecxint(unit) |
| 291 | int unit; |
| 292 | { |
| 293 | register struct ec_softc *es = &ec_softc[unit]; |
| 294 | register struct ecdevice *addr = |
| 295 | (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 296 | |
| 297 | if (es->es_oactive == 0) |
| 298 | return; |
| 299 | if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) { |
| 300 | printf("ec%d: stray xmit interrupt, xcr=%b\n", unit, |
| 301 | addr->ec_xcr, EC_XBITS); |
| 302 | es->es_oactive = 0; |
| 303 | addr->ec_xcr = EC_XCLR; |
| 304 | return; |
| 305 | } |
| 306 | es->es_if.if_opackets++; |
| 307 | es->es_oactive = 0; |
| 308 | es->es_mask = ~0; |
| 309 | addr->ec_xcr = EC_XCLR; |
| 310 | if (es->es_if.if_snd.ifq_head) |
| 311 | ecstart(unit); |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Collision on ethernet interface. Do exponential |
| 316 | * backoff, and retransmit. If have backed off all |
| 317 | * the way print warning diagnostic, and drop packet. |
| 318 | */ |
| 319 | eccollide(unit) |
| 320 | int unit; |
| 321 | { |
| 322 | struct ec_softc *es = &ec_softc[unit]; |
| 323 | |
| 324 | es->es_if.if_collisions++; |
| 325 | if (es->es_oactive) |
| 326 | ecdocoll(unit); |
| 327 | } |
| 328 | |
| 329 | ecdocoll(unit) |
| 330 | int unit; |
| 331 | { |
| 332 | register struct ec_softc *es = &ec_softc[unit]; |
| 333 | register struct ecdevice *addr = |
| 334 | (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 335 | register i; |
| 336 | int delay; |
| 337 | |
| 338 | /* |
| 339 | * Es_mask is a 16 bit number with n low zero bits, with |
| 340 | * n the number of backoffs. When es_mask is 0 we have |
| 341 | * backed off 16 times, and give up. |
| 342 | */ |
| 343 | if (es->es_mask == 0) { |
| 344 | es->es_if.if_oerrors++; |
| 345 | printf("ec%d: send error\n", unit); |
| 346 | /* |
| 347 | * Reset interface, then requeue rcv buffers. |
| 348 | * Some incoming packets may be lost, but that |
| 349 | * can't be helped. |
| 350 | */ |
| 351 | addr->ec_xcr = EC_UECLR; |
| 352 | for (i=ECRHBF; i>=ECRLBF; i--) |
| 353 | addr->ec_rcr = EC_READ|i; |
| 354 | /* |
| 355 | * Reset and transmit next packet (if any). |
| 356 | */ |
| 357 | es->es_oactive = 0; |
| 358 | es->es_mask = ~0; |
| 359 | if (es->es_if.if_snd.ifq_head) |
| 360 | ecstart(unit); |
| 361 | return; |
| 362 | } |
| 363 | /* |
| 364 | * Do exponential backoff. Compute delay based on low bits |
| 365 | * of the interval timer. Then delay for that number of |
| 366 | * slot times. A slot time is 51.2 microseconds (rounded to 51). |
| 367 | * This does not take into account the time already used to |
| 368 | * process the interrupt. |
| 369 | */ |
| 370 | es->es_mask <<= 1; |
| 371 | delay = mfpr(ICR) &~ es->es_mask; |
| 372 | DELAY(delay * 51); |
| 373 | /* |
| 374 | * Clear the controller's collision flag, thus enabling retransmit. |
| 375 | */ |
| 376 | addr->ec_xcr = EC_CLEAR; |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * Ethernet interface receiver interrupt. |
| 381 | * If input error just drop packet. |
| 382 | * Otherwise purge input buffered data path and examine |
| 383 | * packet to determine type. If can't determine length |
| 384 | * from type, then have to drop packet. Othewise decapsulate |
| 385 | * packet based on type and pass to type specific higher-level |
| 386 | * input routine. |
| 387 | */ |
| 388 | ecrint(unit) |
| 389 | int unit; |
| 390 | { |
| 391 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 392 | |
| 393 | while (addr->ec_rcr & EC_RDONE) |
| 394 | ecread(unit); |
| 395 | } |
| 396 | |
| 397 | ecread(unit) |
| 398 | int unit; |
| 399 | { |
| 400 | register struct ec_softc *es = &ec_softc[unit]; |
| 401 | struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr; |
| 402 | register struct ec_header *ec; |
| 403 | struct mbuf *m; |
| 404 | int len, off, resid, ecoff, buf; |
| 405 | register struct ifqueue *inq; |
| 406 | caddr_t ecbuf; |
| 407 | |
| 408 | es->es_if.if_ipackets++; |
| 409 | buf = addr->ec_rcr & EC_RBN; |
| 410 | if (buf < ECRLBF || buf > ECRHBF) |
| 411 | panic("ecrint"); |
| 412 | ecbuf = es->es_buf[buf]; |
| 413 | ecoff = *(short *)ecbuf; |
| 414 | if (ecoff <= ECRDOFF || ecoff > 2046) { |
| 415 | es->es_if.if_ierrors++; |
| 416 | #ifdef notdef |
| 417 | if (es->es_if.if_ierrors % 100 == 0) |
| 418 | printf("ec%d: += 100 input errors\n", unit); |
| 419 | #endif |
| 420 | goto setup; |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * Get input data length. |
| 425 | * Get pointer to ethernet header (in input buffer). |
| 426 | * Deal with trailer protocol: if type is PUP trailer |
| 427 | * get true type from first 16-bit word past data. |
| 428 | * Remember that type was trailer by setting off. |
| 429 | */ |
| 430 | len = ecoff - ECRDOFF - sizeof (struct ec_header); |
| 431 | ec = (struct ec_header *)(ecbuf + ECRDOFF); |
| 432 | #define ecdataaddr(ec, off, type) ((type)(((caddr_t)((ec)+1)+(off)))) |
| 433 | if (ec->ec_type >= ECPUP_TRAIL && |
| 434 | ec->ec_type < ECPUP_TRAIL+ECPUP_NTRAILER) { |
| 435 | off = (ec->ec_type - ECPUP_TRAIL) * 512; |
| 436 | if (off >= ECMTU) |
| 437 | goto setup; /* sanity */ |
| 438 | ec->ec_type = *ecdataaddr(ec, off, u_short *); |
| 439 | resid = *(ecdataaddr(ec, off+2, u_short *)); |
| 440 | if (off + resid > len) |
| 441 | goto setup; /* sanity */ |
| 442 | len = off + resid; |
| 443 | } else |
| 444 | off = 0; |
| 445 | if (len == 0) |
| 446 | goto setup; |
| 447 | |
| 448 | /* |
| 449 | * Pull packet off interface. Off is nonzero if packet |
| 450 | * has trailing header; ecget will then force this header |
| 451 | * information to be at the front, but we still have to drop |
| 452 | * the type and length which are at the front of any trailer data. |
| 453 | */ |
| 454 | m = ecget(ecbuf, len, off); |
| 455 | if (m == 0) |
| 456 | goto setup; |
| 457 | if (off) { |
| 458 | m->m_off += 2 * sizeof (u_short); |
| 459 | m->m_len -= 2 * sizeof (u_short); |
| 460 | } |
| 461 | switch (ec->ec_type) { |
| 462 | |
| 463 | #ifdef INET |
| 464 | case ECPUP_IPTYPE: |
| 465 | schednetisr(NETISR_IP); |
| 466 | inq = &ipintrq; |
| 467 | break; |
| 468 | #endif |
| 469 | default: |
| 470 | m_freem(m); |
| 471 | goto setup; |
| 472 | } |
| 473 | |
| 474 | if (IF_QFULL(inq)) { |
| 475 | IF_DROP(inq); |
| 476 | m_freem(m); |
| 477 | goto setup; |
| 478 | } |
| 479 | IF_ENQUEUE(inq, m); |
| 480 | |
| 481 | setup: |
| 482 | /* |
| 483 | * Reset for next packet. |
| 484 | */ |
| 485 | addr->ec_rcr = EC_READ|EC_RCLR|buf; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Ethernet output routine. |
| 490 | * Encapsulate a packet of type family for the local net. |
| 491 | * Use trailer local net encapsulation if enough data in first |
| 492 | * packet leaves a multiple of 512 bytes of data in remainder. |
| 493 | * If destination is this address or broadcast, send packet to |
| 494 | * loop device to kludge around the fact that 3com interfaces can't |
| 495 | * talk to themselves. |
| 496 | */ |
| 497 | ecoutput(ifp, m0, dst) |
| 498 | struct ifnet *ifp; |
| 499 | struct mbuf *m0; |
| 500 | struct sockaddr *dst; |
| 501 | { |
| 502 | int type, dest, s, error; |
| 503 | register struct ec_softc *es = &ec_softc[ifp->if_unit]; |
| 504 | register struct mbuf *m = m0; |
| 505 | register struct ec_header *ec; |
| 506 | register int off, i; |
| 507 | struct mbuf *mcopy = (struct mbuf *) 0; /* Null */ |
| 508 | |
| 509 | switch (dst->sa_family) { |
| 510 | |
| 511 | #ifdef INET |
| 512 | case AF_INET: |
| 513 | dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; |
| 514 | if ((dest &~ 0xff) == 0) |
| 515 | mcopy = m_copy(m, 0, M_COPYALL); |
| 516 | else if (dest == ((struct sockaddr_in *)&es->es_if.if_addr)-> |
| 517 | sin_addr.s_addr) { |
| 518 | mcopy = m; |
| 519 | goto gotlocal; |
| 520 | } |
| 521 | off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; |
| 522 | if (off > 0 && (off & 0x1ff) == 0 && |
| 523 | m->m_off >= MMINOFF + 2 * sizeof (u_short)) { |
| 524 | type = ECPUP_TRAIL + (off>>9); |
| 525 | m->m_off -= 2 * sizeof (u_short); |
| 526 | m->m_len += 2 * sizeof (u_short); |
| 527 | *mtod(m, u_short *) = ECPUP_IPTYPE; |
| 528 | *(mtod(m, u_short *) + 1) = m->m_len; |
| 529 | goto gottrailertype; |
| 530 | } |
| 531 | type = ECPUP_IPTYPE; |
| 532 | off = 0; |
| 533 | goto gottype; |
| 534 | #endif |
| 535 | |
| 536 | default: |
| 537 | printf("ec%d: can't handle af%d\n", ifp->if_unit, |
| 538 | dst->sa_family); |
| 539 | error = EAFNOSUPPORT; |
| 540 | goto bad; |
| 541 | } |
| 542 | |
| 543 | gottrailertype: |
| 544 | /* |
| 545 | * Packet to be sent as trailer: move first packet |
| 546 | * (control information) to end of chain. |
| 547 | */ |
| 548 | while (m->m_next) |
| 549 | m = m->m_next; |
| 550 | m->m_next = m0; |
| 551 | m = m0->m_next; |
| 552 | m0->m_next = 0; |
| 553 | m0 = m; |
| 554 | |
| 555 | gottype: |
| 556 | /* |
| 557 | * Add local net header. If no space in first mbuf, |
| 558 | * allocate another. |
| 559 | */ |
| 560 | if (m->m_off > MMAXOFF || |
| 561 | MMINOFF + sizeof (struct ec_header) > m->m_off) { |
| 562 | m = m_get(M_DONTWAIT); |
| 563 | if (m == 0) { |
| 564 | error = ENOBUFS; |
| 565 | goto bad; |
| 566 | } |
| 567 | m->m_next = m0; |
| 568 | m->m_off = MMINOFF; |
| 569 | m->m_len = sizeof (struct ec_header); |
| 570 | } else { |
| 571 | m->m_off -= sizeof (struct ec_header); |
| 572 | m->m_len += sizeof (struct ec_header); |
| 573 | } |
| 574 | ec = mtod(m, struct ec_header *); |
| 575 | for (i=0; i<6; i++) |
| 576 | ec->ec_shost[i] = es->es_enaddr[i]; |
| 577 | if ((dest &~ 0xff) == 0) |
| 578 | /* broadcast address */ |
| 579 | for (i=0; i<6; i++) |
| 580 | ec->ec_dhost[i] = 0xff; |
| 581 | else { |
| 582 | if (dest & 0x8000) { |
| 583 | ec->ec_dhost[0] = ec_iltop[0]; |
| 584 | ec->ec_dhost[1] = ec_iltop[1]; |
| 585 | ec->ec_dhost[2] = ec_iltop[2]; |
| 586 | } else { |
| 587 | ec->ec_dhost[0] = es->es_enaddr[0]; |
| 588 | ec->ec_dhost[1] = es->es_enaddr[1]; |
| 589 | ec->ec_dhost[2] = es->es_enaddr[2]; |
| 590 | } |
| 591 | ec->ec_dhost[3] = (dest>>8) & 0x7f; |
| 592 | ec->ec_dhost[4] = (dest>>16) & 0xff; |
| 593 | ec->ec_dhost[5] = (dest>>24) & 0xff; |
| 594 | } |
| 595 | ec->ec_type = type; |
| 596 | |
| 597 | /* |
| 598 | * Queue message on interface, and start output if interface |
| 599 | * not yet active. |
| 600 | */ |
| 601 | s = splimp(); |
| 602 | if (IF_QFULL(&ifp->if_snd)) { |
| 603 | IF_DROP(&ifp->if_snd); |
| 604 | error = ENOBUFS; |
| 605 | goto qfull; |
| 606 | } |
| 607 | IF_ENQUEUE(&ifp->if_snd, m); |
| 608 | if (es->es_oactive == 0) |
| 609 | ecstart(ifp->if_unit); |
| 610 | splx(s); |
| 611 | |
| 612 | gotlocal: |
| 613 | return(mcopy ? looutput(&loif, mcopy, dst) : 0); |
| 614 | |
| 615 | qfull: |
| 616 | m0 = m; |
| 617 | splx(s); |
| 618 | bad: |
| 619 | m_freem(m0); |
| 620 | return(error); |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * Routine to copy from mbuf chain to transmitter |
| 625 | * buffer in UNIBUS memory. |
| 626 | */ |
| 627 | ecput(ecbuf, m) |
| 628 | u_char *ecbuf; |
| 629 | struct mbuf *m; |
| 630 | { |
| 631 | register struct mbuf *mp; |
| 632 | register int off; |
| 633 | u_char *bp; |
| 634 | |
| 635 | for (off = 2048, mp = m; mp; mp = mp->m_next) |
| 636 | off -= mp->m_len; |
| 637 | *(u_short *)ecbuf = off; |
| 638 | bp = (u_char *)(ecbuf + off); |
| 639 | for (mp = m; mp; mp = mp->m_next) { |
| 640 | register unsigned len = mp->m_len; |
| 641 | u_char *mcp; |
| 642 | |
| 643 | if (len == 0) |
| 644 | continue; |
| 645 | mcp = mtod(mp, u_char *); |
| 646 | if ((unsigned)bp & 01) { |
| 647 | *bp++ = *mcp++; |
| 648 | len--; |
| 649 | } |
| 650 | if (off = (len >> 1)) { |
| 651 | register u_short *to, *from; |
| 652 | |
| 653 | to = (u_short *)bp; |
| 654 | from = (u_short *)mcp; |
| 655 | do |
| 656 | *to++ = *from++; |
| 657 | while (--off > 0); |
| 658 | bp = (u_char *)to, |
| 659 | mcp = (u_char *)from; |
| 660 | } |
| 661 | if (len & 01) |
| 662 | *bp++ = *mcp++; |
| 663 | } |
| 664 | #ifdef notdef |
| 665 | if (bp - ecbuf != 2048) |
| 666 | printf("ec: bad ecput, diff=%d\n", bp-ecbuf); |
| 667 | #endif |
| 668 | m_freem(m); |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * Routine to copy from UNIBUS memory into mbufs. |
| 673 | * Similar in spirit to if_rubaget. |
| 674 | * |
| 675 | * Warning: This makes the fairly safe assumption that |
| 676 | * mbufs have even lengths. |
| 677 | */ |
| 678 | struct mbuf * |
| 679 | ecget(ecbuf, totlen, off0) |
| 680 | u_char *ecbuf; |
| 681 | int totlen, off0; |
| 682 | { |
| 683 | register struct mbuf *m; |
| 684 | struct mbuf *top = 0, **mp = ⊤ |
| 685 | register int off = off0, len; |
| 686 | u_char *cp; |
| 687 | |
| 688 | cp = ecbuf + ECRDOFF + sizeof (struct ec_header); |
| 689 | while (totlen > 0) { |
| 690 | register int words; |
| 691 | u_char *mcp; |
| 692 | |
| 693 | MGET(m, 0); |
| 694 | if (m == 0) |
| 695 | goto bad; |
| 696 | if (off) { |
| 697 | len = totlen - off; |
| 698 | cp = ecbuf + ECRDOFF + sizeof (struct ec_header) + off; |
| 699 | } else |
| 700 | len = totlen; |
| 701 | if (len >= CLBYTES) { |
| 702 | struct mbuf *p; |
| 703 | |
| 704 | MCLGET(p, 1); |
| 705 | if (p != 0) { |
| 706 | m->m_len = len = CLBYTES; |
| 707 | m->m_off = (int)p - (int)m; |
| 708 | } else { |
| 709 | m->m_len = len = MIN(MLEN, len); |
| 710 | m->m_off = MMINOFF; |
| 711 | } |
| 712 | } else { |
| 713 | m->m_len = len = MIN(MLEN, len); |
| 714 | m->m_off = MMINOFF; |
| 715 | } |
| 716 | mcp = mtod(m, u_char *); |
| 717 | if (words = (len >> 1)) { |
| 718 | register u_short *to, *from; |
| 719 | |
| 720 | to = (u_short *)mcp; |
| 721 | from = (u_short *)cp; |
| 722 | do |
| 723 | *to++ = *from++; |
| 724 | while (--words > 0); |
| 725 | mcp = (u_char *)to; |
| 726 | cp = (u_char *)from; |
| 727 | } |
| 728 | if (len & 01) |
| 729 | *mcp++ = *cp++; |
| 730 | *mp = m; |
| 731 | mp = &m->m_next; |
| 732 | if (off == 0) { |
| 733 | totlen -= len; |
| 734 | continue; |
| 735 | } |
| 736 | off += len; |
| 737 | if (off == totlen) { |
| 738 | cp = ecbuf + ECRDOFF + sizeof (struct ec_header); |
| 739 | off = 0; |
| 740 | totlen = off0; |
| 741 | } |
| 742 | } |
| 743 | return (top); |
| 744 | bad: |
| 745 | m_freem(top); |
| 746 | return (0); |
| 747 | } |