1 /* if_vv.c 4.18 83/05/10 */ 2 3 #include "vv.h" 4 5 /* 6 * Proteon 10 Meg Ring Driver. 7 * This device is called "vv" because its "real name", 8 * V2LNI won't work if shortened to the obvious "v2". 9 * Hence the subterfuge. 10 * 11 */ 12 #include "../machine/pte.h" 13 14 #include "../h/param.h" 15 #include "../h/systm.h" 16 #include "../h/mbuf.h" 17 #include "../h/buf.h" 18 #include "../h/protosw.h" 19 #include "../h/socket.h" 20 #include "../h/vmmac.h" 21 #include "../h/errno.h" 22 #include "../h/time.h" 23 #include "../h/kernel.h" 24 25 #include "../net/if.h" 26 #include "../net/netisr.h" 27 #include "../net/route.h" 28 29 #include "../netinet/in.h" 30 #include "../netinet/in_systm.h" 31 #include "../netinet/ip.h" 32 #include "../netinet/ip_var.h" 33 34 #include "../vax/mtpr.h" 35 #include "../vax/cpu.h" 36 37 #include "../vaxuba/ubareg.h" 38 #include "../vaxuba/ubavar.h" 39 40 #include "../vaxif/if_vv.h" 41 #include "../vaxif/if_uba.h" 42 43 /* 44 * N.B. - if WIRECENTER is defined wrong, it can well break 45 * the hardware!! 46 */ 47 #define WIRECENTER 48 49 #ifdef WIRECENTER 50 #define VV_CONF VV_HEN /* drive wire center relay */ 51 #else 52 #define VV_CONF VV_STE /* allow operation without wire center */ 53 #endif 54 55 #define VVMTU (1024+512) 56 #define VVMRU (1024+512+16) /* space for trailer */ 57 58 int vv_dotrailer = 0, /* 1 => do trailer protocol */ 59 vv_tracehdr = 0, /* 1 => trace headers (slowly!!) */ 60 vv_tracetimeout = 1; /* 1 => trace input error-rate limiting */ 61 vv_logreaderrors = 0; /* 1 => log all read errors */ 62 63 #define vvtracehdr if (vv_tracehdr) vvprt_hdr 64 #define vvtrprintf if (vv_tracetimeout) printf 65 66 int vv_ticking = 0; /* error flywheel is running */ 67 68 /* 69 * Interval in HZ - 50 msec. 70 * N.B. all times below are in units of flywheel ticks 71 */ 72 #define VV_FLYWHEEL 3 73 #define VV_ERRORTHRESHOLD 100 /* errors/flywheel-interval */ 74 #define VV_MODE1ATTEMPTS 10 /* number mode 1 retries */ 75 #define VV_MODE1DELAY 2 /* period interface is PAUSEd - 100ms */ 76 #define VV_MODE2DELAY 4 /* base interval host relay is off - 200ms */ 77 #define VV_MAXDELAY 6400 /* max interval host relay is off - 2 minutes */ 78 79 int vvprobe(), vvattach(), vvrint(), vvxint(); 80 struct uba_device *vvinfo[NVV]; 81 u_short vvstd[] = { 0 }; 82 struct uba_driver vvdriver = 83 { vvprobe, 0, vvattach, 0, vvstd, "vv", vvinfo }; 84 #define VVUNIT(x) minor(x) 85 int vvinit(),vvoutput(),vvreset(); 86 87 /* 88 * Software status of each interface. 89 * 90 * Each interface is referenced by a network interface structure, 91 * vs_if, which the routing code uses to locate the interface. 92 * This structure contains the output queue for the interface, its address, ... 93 * We also have, for each interface, a UBA interface structure, which 94 * contains information about the UNIBUS resources held by the interface: 95 * map registers, buffered data paths, etc. Information is cached in this 96 * structure for use by the if_uba.c routines in running the interface 97 * efficiently. 98 */ 99 struct vv_softc { 100 struct ifnet vs_if; /* network-visible interface */ 101 struct ifuba vs_ifuba; /* UNIBUS resources */ 102 short vs_oactive; /* is output active */ 103 short vs_iactive; /* is input active */ 104 short vs_olen; /* length of last output */ 105 u_short vs_lastx; /* last destination address */ 106 short vs_tries; /* transmit current retry count */ 107 short vs_init; /* number of ring inits */ 108 short vs_nottaken; /* number of packets refused */ 109 /* input error rate limiting state */ 110 short vs_major; /* recovery major state */ 111 short vs_minor; /* recovery minor state */ 112 short vs_retry; /* recovery retry count */ 113 short vs_delayclock; /* recovery delay clock */ 114 short vs_delayrange; /* increasing delay interval */ 115 short vs_dropped; /* number of packes tossed in last dt */ 116 } vv_softc[NVV]; 117 118 /* 119 * States of vs_iactive. 120 */ 121 #define ACTIVE 1 /* interface should post new receives */ 122 #define PAUSE 0 /* interface should NOT post new receives */ 123 #define OPEN -1 /* PAUSE and open host relay */ 124 125 /* 126 * Recovery major states. 127 */ 128 #define MODE0 0 /* everything is wonderful */ 129 #define MODE1 1 /* hopefully whatever will go away */ 130 #define MODE2 2 /* drastic measures - open host relay for increasing intervals */ 131 132 vvprobe(reg) 133 caddr_t reg; 134 { 135 register int br, cvec; 136 register struct vvreg *addr = (struct vvreg *)reg; 137 138 #ifdef lint 139 br = 0; cvec = br; br = cvec; 140 #endif 141 /* reset interface, enable, and wait till dust settles */ 142 addr->vvicsr = VV_RST; 143 addr->vvocsr = VV_RST; 144 DELAY(10000); 145 /* generate interrupt by doing 1 word DMA from 0 in uba space!! */ 146 addr->vvocsr = VV_IEN; /* enable interrupt */ 147 addr->vvoba = 0; /* low 16 bits */ 148 addr->vvoea = 0; /* extended bits */ 149 addr->vvowc = -1; /* for 1 word */ 150 addr->vvocsr |= VV_DEN; /* start the DMA */ 151 DELAY(100000); 152 addr->vvocsr = 0; 153 if (cvec && cvec != 0x200) 154 cvec -= 4; /* backup so vector => recieve */ 155 return(1); 156 } 157 158 /* 159 * Interface exists: make available by filling in network interface 160 * record. System will initialize the interface when it is ready 161 * to accept packets. 162 */ 163 vvattach(ui) 164 struct uba_device *ui; 165 { 166 register struct vv_softc *vs = &vv_softc[ui->ui_unit]; 167 register struct sockaddr_in *sin; 168 169 vs->vs_if.if_unit = ui->ui_unit; 170 vs->vs_if.if_name = "vv"; 171 vs->vs_if.if_mtu = VVMTU; 172 vs->vs_if.if_net = ui->ui_flags; 173 vs->vs_if.if_host[0] = 0; /* this will be reset in vvinit() */ 174 sin = (struct sockaddr_in *)&vs->vs_if.if_addr; 175 sin->sin_family = AF_INET; 176 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, vs->vs_if.if_host[0]); 177 sin = (struct sockaddr_in *)&vs->vs_if.if_broadaddr; 178 sin->sin_family = AF_INET; 179 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, VV_BROADCAST); 180 vs->vs_if.if_flags = IFF_BROADCAST; 181 vs->vs_if.if_init = vvinit; 182 vs->vs_if.if_output = vvoutput; 183 vs->vs_if.if_reset = vvreset; 184 vs->vs_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEEDBDP | UBA_NEED16; 185 #if defined(VAX750) 186 /* don't chew up 750 bdp's */ 187 if (cpu == VAX_750 && ui->ui_unit > 0) 188 vs->vs_ifuba.ifu_flags &= ~UBA_NEEDBDP; 189 #endif 190 if_attach(&vs->vs_if); 191 } 192 193 /* 194 * Reset of interface after UNIBUS reset. 195 * If interface is on specified uba, reset its state. 196 */ 197 vvreset(unit, uban) 198 int unit, uban; 199 { 200 register struct uba_device *ui; 201 202 if (unit >= NVV || (ui = vvinfo[unit]) == 0 || ui->ui_alive == 0 || 203 ui->ui_ubanum != uban) 204 return; 205 printf(" vv%d", unit); 206 vvinit(unit); 207 } 208 209 /* 210 * Initialization of interface; clear recorded pending 211 * operations, and reinitialize UNIBUS usage. 212 */ 213 vvinit(unit) 214 int unit; 215 { 216 register struct vv_softc *vs = &vv_softc[unit]; 217 register struct uba_device *ui = vvinfo[unit]; 218 register struct vvreg *addr; 219 struct sockaddr_in *sin; 220 int ubainfo, s; 221 int vvtimeout(); 222 223 addr = (struct vvreg *)ui->ui_addr; 224 if (if_ubainit(&vs->vs_ifuba, ui->ui_ubanum, 225 sizeof (struct vv_header), (int)btoc(VVMTU)) == 0) { 226 printf("vv%d: can't initialize\n", unit); 227 vs->vs_if.if_flags &= ~IFF_UP; 228 return; 229 } 230 if (vv_ticking++ == 0) 231 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 232 /* 233 * Discover our host address and post it 234 */ 235 vs->vs_if.if_host[0] = vvidentify(unit); 236 printf("vv%d: host %d\n", unit, vs->vs_if.if_host[0]); 237 sin = (struct sockaddr_in *)&vs->vs_if.if_addr; 238 sin->sin_family = AF_INET; 239 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, vs->vs_if.if_host[0]); 240 241 /* 242 * Reset the interface, and join the ring 243 */ 244 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 245 addr->vvicsr = VV_RST | VV_CONF; /* close logical relay */ 246 DELAY(500000); /* let contacts settle */ 247 vs->vs_init = 0; 248 vs->vs_dropped = 0; 249 vs->vs_nottaken = 0; 250 251 /* 252 * Hang a receive and start any 253 * pending writes by faking a transmit complete. 254 */ 255 s = splimp(); 256 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 257 addr->vviba = (u_short) ubainfo; 258 addr->vviea = (u_short) (ubainfo >> 16); 259 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 260 addr->vvicsr = VV_IEN | VV_CONF | VV_DEN | VV_ENB; 261 vs->vs_iactive = ACTIVE; 262 vs->vs_oactive = 1; 263 vs->vs_if.if_flags |= IFF_UP; 264 vvxint(unit); 265 splx(s); 266 if_rtinit(&vs->vs_if, RTF_UP); 267 } 268 269 /* 270 * vvidentify() - return our host address 271 */ 272 vvidentify(unit) 273 { 274 register struct vv_softc *vs = &vv_softc[unit]; 275 register struct uba_device *ui = vvinfo[unit]; 276 register struct vvreg *addr; 277 struct mbuf *m; 278 struct vv_header *v; 279 int ubainfo, retrying, attempts, waitcount, s; 280 281 /* 282 * Build a multicast message to identify our address 283 */ 284 addr = (struct vvreg *)ui->ui_addr; 285 attempts = 0; /* total attempts, including bad msg type */ 286 retrying = 0; /* first time through */ 287 m = m_get(M_DONTWAIT, MT_HEADER); 288 if (m == 0) 289 panic("vvinit: can't get mbuf"); 290 m->m_next = 0; 291 m->m_off = MMINOFF; 292 m->m_len = sizeof(struct vv_header); 293 v = mtod(m, struct vv_header *); 294 v->vh_dhost = VV_BROADCAST; /* multicast destination address */ 295 v->vh_shost = 0; /* will be overwritten with ours */ 296 v->vh_version = RING_VERSION; 297 v->vh_type = RING_WHOAMI; 298 v->vh_info = 0; 299 /* map xmit message into uba */ 300 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 301 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 302 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 303 /* 304 * Reset interface, establish Digital Loopback Mode, and 305 * send the multicast (to myself) with Input Copy enabled. 306 */ 307 retry: 308 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 309 addr->vvicsr = VV_RST; 310 addr->vviba = (u_short) ubainfo; 311 addr->vviea = (u_short) (ubainfo >> 16); 312 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 313 addr->vvicsr = VV_STE | VV_DEN | VV_ENB | VV_LPB; 314 315 /* let flag timers fire so ring will initialize */ 316 DELAY(2000000); 317 318 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 319 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 320 addr->vvoba = (u_short) ubainfo; 321 addr->vvoea = (u_short) (ubainfo >> 16); 322 addr->vvowc = -((vs->vs_olen + 1) >> 1); 323 addr->vvocsr = VV_CPB | VV_DEN | VV_INR | VV_ENB; 324 /* 325 * Wait for receive side to finish. 326 * Extract source address (which will our own), 327 * and post to interface structure. 328 */ 329 DELAY(1000); 330 for (waitcount = 0; (addr->vvicsr & VV_RDY) == 0; waitcount++) { 331 if (waitcount < 10) { 332 DELAY(1000); 333 continue; 334 } 335 if (attempts++ >= 10) { 336 printf("vv%d: can't initialize\n", unit); 337 printf("vvinit loopwait: icsr = %b\n", 338 0xffff&(addr->vvicsr), VV_IBITS); 339 vs->vs_if.if_flags &= ~IFF_UP; 340 return; 341 } 342 goto retry; 343 } 344 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 345 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 346 if (vs->vs_ifuba.ifu_xtofree) 347 m_freem(vs->vs_ifuba.ifu_xtofree); 348 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 349 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 350 m = if_rubaget(&vs->vs_ifuba, sizeof(struct vv_header), 0); 351 if (m != NULL) 352 m_freem(m); 353 /* 354 * Check message type before we believe the source host address 355 */ 356 v = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 357 if (v->vh_type != RING_WHOAMI) 358 goto retry; 359 return(v->vh_shost); 360 } 361 362 /* 363 * vvtimeout() - called by timer flywheel to monitor input packet 364 * discard rate. Interfaces getting too many errors are shut 365 * down for a while. If the condition persists, the interface 366 * is marked down. 367 */ 368 vvtimeout(junk) 369 int junk; 370 { 371 register struct vv_softc *vs; 372 register int i; 373 register struct vvreg *addr; 374 int ubainfo; 375 376 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 377 for (i = 0; i < NVV; i++) { 378 vs = &vv_softc[i]; 379 addr = (struct vvreg *)vvinfo[i]->ui_addr; 380 if (vs->vs_if.if_flags & IFF_UP == 0) continue; 381 switch (vs->vs_major) { 382 383 /* 384 * MODE0: generally OK, just check error rate 385 */ 386 case MODE0: 387 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 388 vs->vs_dropped = 0; 389 continue; 390 } 391 /* suspend reads for a while */ 392 vvtrprintf("vv%d going MODE1 in vvtimeout\n",i); 393 vs->vs_major = MODE1; 394 vs->vs_iactive = PAUSE; /* no new reads */ 395 vs->vs_retry = VV_MODE1ATTEMPTS; 396 vs->vs_delayclock = VV_MODE1DELAY; 397 vs->vs_minor = 0; 398 continue; 399 400 /* 401 * MODE1: excessive error rate observed 402 * Scheme: try simply suspending reads for a 403 * short while a small number of times 404 */ 405 case MODE1: 406 if (vs->vs_delayclock > 0) { 407 vs->vs_delayclock--; 408 continue; 409 } 410 switch (vs->vs_minor) { 411 412 case 0: /* reenable reads */ 413 vvtrprintf("vv%d M1m0\n",i); 414 vs->vs_dropped = 0; 415 vs->vs_iactive = ACTIVE; 416 vs->vs_minor = 1; /* next state */ 417 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 418 addr->vviba = (u_short) ubainfo; 419 addr->vviea = (u_short) (ubainfo >> 16); 420 addr->vviwc = 421 -(sizeof (struct vv_header) + VVMTU) >> 1; 422 addr->vvicsr = VV_RST | VV_CONF; 423 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 424 continue; 425 426 case 1: /* see if it worked */ 427 vvtrprintf("vv%d M1m1\n",i); 428 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 429 vs->vs_dropped = 0; 430 vs->vs_major = MODE0; /* yeah!! */ 431 continue; 432 } 433 if (vs->vs_retry -- > 0) { 434 vs->vs_dropped = 0; 435 vs->vs_iactive = PAUSE; 436 vs->vs_delayclock = VV_MODE1DELAY; 437 vs->vs_minor = 0; /* recheck */ 438 continue; 439 } 440 vs->vs_major = MODE2; 441 vs->vs_minor = 0; 442 vs->vs_dropped = 0; 443 vs->vs_iactive = OPEN; 444 vs->vs_delayrange = VV_MODE2DELAY; 445 vs->vs_delayclock = VV_MODE2DELAY; 446 /* fall thru ... */ 447 } 448 449 /* 450 * MODE2: simply ignoring traffic didn't relieve condition 451 * Scheme: open host relay for intervals linearly 452 * increasing up to some maximum of a several minutes. 453 * This allows broken networks to return to operation 454 * without rebooting. 455 */ 456 case MODE2: 457 if (vs->vs_delayclock > 0) { 458 vs->vs_delayclock--; 459 continue; 460 } 461 switch (vs->vs_minor) { 462 463 case 0: /* close relay and reenable reads */ 464 vvtrprintf("vv%d M2m0\n",i); 465 vs->vs_dropped = 0; 466 vs->vs_iactive = ACTIVE; 467 vs->vs_minor = 1; /* next state */ 468 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 469 addr->vviba = (u_short) ubainfo; 470 addr->vviea = (u_short) (ubainfo >> 16); 471 addr->vviwc = 472 -(sizeof (struct vv_header) + VVMTU) >> 1; 473 addr->vvicsr = VV_RST | VV_CONF; 474 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 475 continue; 476 477 case 1: /* see if it worked */ 478 vvtrprintf("vv%d M2m1\n",i); 479 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 480 vs->vs_dropped = 0; 481 vs->vs_major = MODE0; /* yeah!! */ 482 continue; 483 } 484 vvtrprintf("vv%d M2m1 ++ delay\n",i); 485 vs->vs_dropped = 0; 486 vs->vs_iactive = OPEN; 487 vs->vs_minor = 0; 488 if (vs->vs_delayrange < VV_MAXDELAY) 489 vs->vs_delayrange += 490 (vs->vs_delayrange/2); 491 vs->vs_delayclock = vs->vs_delayrange; 492 continue; 493 } 494 495 default: 496 printf("vv%d: major state screwed\n", i); 497 vs->vs_if.if_flags &= ~IFF_UP; 498 } 499 } 500 } 501 502 /* 503 * Start or restart output on interface. 504 * If interface is active, this is a retransmit, so just 505 * restuff registers and go. 506 * If interface is not already active, get another datagram 507 * to send off of the interface queue, and map it to the interface 508 * before starting the output. 509 */ 510 vvstart(dev) 511 dev_t dev; 512 { 513 int unit = VVUNIT(dev); 514 struct uba_device *ui = vvinfo[unit]; 515 register struct vv_softc *vs = &vv_softc[unit]; 516 register struct vvreg *addr; 517 struct mbuf *m; 518 int ubainfo; 519 int dest; 520 521 if (vs->vs_oactive) 522 goto restart; 523 /* 524 * Not already active: dequeue another request 525 * and map it to the UNIBUS. If no more requests, 526 * just return. 527 */ 528 IF_DEQUEUE(&vs->vs_if.if_snd, m); 529 if (m == NULL) { 530 vs->vs_oactive = 0; 531 return; 532 } 533 dest = mtod(m, struct vv_header *)->vh_dhost; 534 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 535 vs->vs_lastx = dest; 536 restart: 537 /* 538 * Have request mapped to UNIBUS for transmission. 539 * Purge any stale data from this BDP, and start the otput. 540 */ 541 if (vs->vs_olen > VVMTU + sizeof (struct vvheader)) { 542 printf("vv%d vs_olen: %d > VVMTU\n", unit, vs->vs_olen); 543 panic("vvdriver vs_olen botch"); 544 } 545 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 546 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 547 addr = (struct vvreg *)ui->ui_addr; 548 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 549 addr->vvoba = (u_short) ubainfo; 550 addr->vvoea = (u_short) (ubainfo >> 16); 551 addr->vvowc = -((vs->vs_olen + 1) >> 1); 552 addr->vvocsr = VV_IEN | VV_CPB | VV_DEN | VV_INR | VV_ENB; 553 vs->vs_oactive = 1; 554 } 555 556 /* 557 * VVLNI transmit interrupt 558 * Start another output if more data to send. 559 */ 560 vvxint(unit) 561 int unit; 562 { 563 register struct uba_device *ui = vvinfo[unit]; 564 register struct vv_softc *vs = &vv_softc[unit]; 565 register struct vvreg *addr; 566 register int oc; 567 568 addr = (struct vvreg *)ui->ui_addr; 569 oc = 0xffff & (addr->vvocsr); 570 if (vs->vs_oactive == 0) { 571 printf("vv%d: stray interrupt vvocsr = %b\n", unit, 572 oc, VV_OBITS); 573 return; 574 } 575 if (oc & (VV_OPT | VV_RFS)) { 576 vs->vs_if.if_collisions++; 577 if (vs->vs_tries++ < VVRETRY) { 578 if (oc & VV_OPT) 579 vs->vs_init++; 580 if (oc & VV_RFS) 581 vs->vs_nottaken++; 582 vvstart(unit); /* restart this message */ 583 return; 584 } 585 if (oc & VV_OPT) 586 printf("vv%d: output timeout\n"); 587 } 588 vs->vs_if.if_opackets++; 589 vs->vs_oactive = 0; 590 vs->vs_tries = 0; 591 if (oc & VVXERR) { 592 vs->vs_if.if_oerrors++; 593 printf("vv%d: error vvocsr = %b\n", unit, 0xffff & oc, 594 VV_OBITS); 595 } 596 if (vs->vs_ifuba.ifu_xtofree) { 597 m_freem(vs->vs_ifuba.ifu_xtofree); 598 vs->vs_ifuba.ifu_xtofree = 0; 599 } 600 if (vs->vs_if.if_snd.ifq_head == 0) { 601 vs->vs_lastx = 256; /* an invalid address */ 602 return; 603 } 604 vvstart(unit); 605 } 606 607 /* 608 * V2lni interface receiver interrupt. 609 * If input error just drop packet. 610 * Otherwise purge input buffered data path and examine 611 * packet to determine type. If can't determine length 612 * from type, then have to drop packet. Othewise decapsulate 613 * packet based on type and pass to type specific higher-level 614 * input routine. 615 */ 616 vvrint(unit) 617 int unit; 618 { 619 register struct vv_softc *vs = &vv_softc[unit]; 620 struct vvreg *addr = (struct vvreg *)vvinfo[unit]->ui_addr; 621 register struct vv_header *vv; 622 register struct ifqueue *inq; 623 struct mbuf *m; 624 int ubainfo, len, off; 625 short resid; 626 627 vs->vs_if.if_ipackets++; 628 /* 629 * Purge BDP; drop if input error indicated. 630 */ 631 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 632 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 633 if (addr->vvicsr & VVRERR) { 634 if (vv_logreaderrors) 635 printf("vv%d: error vvicsr = %b\n", unit, 636 0xffff&(addr->vvicsr), VV_IBITS); 637 goto dropit; 638 } 639 640 /* 641 * Get packet length from word count residue 642 * 643 * Compute header offset if trailer protocol 644 * 645 * Pull packet off interface. Off is nonzero if packet 646 * has trailing header; if_rubaget will then force this header 647 * information to be at the front. The vh_info field 648 * carries the offset to the trailer data in trailer 649 * format packets. 650 */ 651 vv = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 652 vvtracehdr("vi", vv); 653 resid = addr->vviwc; 654 if (resid) 655 resid |= 0176000; /* ugly!!!! */ 656 len = (((sizeof (struct vv_header) + VVMRU) >> 1) + resid) << 1; 657 len -= sizeof(struct vv_header); 658 if (len > VVMRU || len <= 0) 659 goto dropit; 660 #define vvdataaddr(vv, off, type) ((type)(((caddr_t)((vv)+1)+(off)))) 661 if (vv_dotrailer && vv->vh_type >= RING_IPTrailer && 662 vv->vh_type < RING_IPTrailer+RING_IPNTrailer){ 663 off = (vv->vh_type - RING_IPTrailer) * 512; 664 if (off > VVMTU) 665 goto dropit; 666 vv->vh_type = *vvdataaddr(vv, off, u_short *); 667 resid = *(vvdataaddr(vv, off+2, u_short *)); 668 if (off + resid > len) 669 goto dropit; 670 len = off + resid; 671 } else 672 off = 0; 673 if (len == 0) 674 goto dropit; 675 m = if_rubaget(&vs->vs_ifuba, len, off); 676 if (m == NULL) 677 goto dropit; 678 if (off) { 679 m->m_off += 2 * sizeof(u_short); 680 m->m_len -= 2 * sizeof(u_short); 681 } 682 683 /* 684 * Demultiplex on packet type 685 */ 686 switch (vv->vh_type) { 687 688 #ifdef INET 689 case RING_IP: 690 schednetisr(NETISR_IP); 691 inq = &ipintrq; 692 break; 693 #endif 694 default: 695 printf("vv%d: unknown pkt type 0x%x\n", unit, vv->vh_type); 696 m_freem(m); 697 goto setup; 698 } 699 if (IF_QFULL(inq)) { 700 IF_DROP(inq); 701 m_freem(m); 702 } else 703 IF_ENQUEUE(inq, m); 704 setup: 705 /* 706 * Check the error rate and start recovery if needed 707 * this has to go here since the timer flywheel runs at 708 * a lower ipl and never gets a chance to change the mode 709 */ 710 if (vs->vs_major == MODE0 && vs->vs_dropped > VV_ERRORTHRESHOLD) { 711 vvtrprintf("vv%d going MODE1 in vvrint\n",unit); 712 vs->vs_major = MODE1; 713 vs->vs_iactive = PAUSE; /* no new reads */ 714 vs->vs_retry = VV_MODE1ATTEMPTS; 715 vs->vs_delayclock = VV_MODE1DELAY; 716 vs->vs_minor = 0; 717 vs->vs_dropped = 0; 718 } 719 switch (vs->vs_iactive) { 720 721 case ACTIVE: /* Restart the read for next packet */ 722 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 723 addr->vviba = (u_short) ubainfo; 724 addr->vviea = (u_short) (ubainfo >> 16); 725 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 726 addr->vvicsr = VV_RST | VV_CONF; 727 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 728 return; 729 730 case PAUSE: /* requested to not start any new reads */ 731 vs->vs_dropped = 0; 732 return; 733 734 case OPEN: /* request to open host relay */ 735 vs->vs_dropped = 0; 736 addr->vvicsr = 0; 737 return; 738 739 default: 740 printf("vv%d: vs_iactive = %d\n", unit, vs->vs_iactive); 741 return; 742 } 743 /* 744 * Drop packet on floor -- count them!! 745 */ 746 dropit: 747 vs->vs_if.if_ierrors++; 748 vs->vs_dropped++; 749 /* 750 printf("vv%d: error vvicsr = %b\n", unit, 751 0xffff&(addr->vvicsr), VV_IBITS); 752 */ 753 goto setup; 754 } 755 756 /* 757 * V2lni output routine. 758 * Encapsulate a packet of type family for the local net. 759 * Use trailer local net encapsulation if enough data in first 760 * packet leaves a multiple of 512 bytes of data in remainder. 761 */ 762 vvoutput(ifp, m0, dst) 763 struct ifnet *ifp; 764 struct mbuf *m0; 765 struct sockaddr *dst; 766 { 767 register struct mbuf *m = m0; 768 register struct vv_header *vv; 769 register int off; 770 int type, dest, s, error; 771 772 switch (dst->sa_family) { 773 774 #ifdef INET 775 case AF_INET: { 776 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 777 if ((dest = in_lnaof(*((struct in_addr *)&dest))) >= 0x100) { 778 error = EPERM; 779 goto bad; 780 } 781 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 782 if (vv_dotrailer && off > 0 && (off & 0x1ff) == 0 && 783 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 784 type = RING_IPTrailer + (off>>9); 785 m->m_off -= 2 * sizeof (u_short); 786 m->m_len += 2 * sizeof (u_short); 787 *mtod(m, u_short *) = RING_IP; 788 *(mtod(m, u_short *) + 1) = m->m_len; 789 goto gottrailertype; 790 } 791 type = RING_IP; 792 off = 0; 793 goto gottype; 794 } 795 #endif 796 default: 797 printf("vv%d: can't handle af%d\n", ifp->if_unit, 798 dst->sa_family); 799 error = EAFNOSUPPORT; 800 goto bad; 801 } 802 803 gottrailertype: 804 /* 805 * Packet to be sent as trailer: move first packet 806 * (control information) to end of chain. 807 */ 808 while (m->m_next) 809 m = m->m_next; 810 m->m_next = m0; 811 m = m0->m_next; 812 m0->m_next = 0; 813 m0 = m; 814 gottype: 815 /* 816 * Add local net header. If no space in first mbuf, 817 * allocate another. 818 */ 819 if (m->m_off > MMAXOFF || 820 MMINOFF + sizeof (struct vv_header) > m->m_off) { 821 m = m_get(M_DONTWAIT, MT_HEADER); 822 if (m == NULL) { 823 error = ENOBUFS; 824 goto bad; 825 } 826 m->m_next = m0; 827 m->m_off = MMINOFF; 828 m->m_len = sizeof (struct vv_header); 829 } else { 830 m->m_off -= sizeof (struct vv_header); 831 m->m_len += sizeof (struct vv_header); 832 } 833 vv = mtod(m, struct vv_header *); 834 vv->vh_shost = ifp->if_host[0]; 835 vv->vh_dhost = dest; 836 vv->vh_version = RING_VERSION; 837 vv->vh_type = type; 838 vv->vh_info = off; 839 vvtracehdr("vo", vv); 840 841 /* 842 * Queue message on interface, and start output if interface 843 * not yet active. 844 */ 845 s = splimp(); 846 if (IF_QFULL(&ifp->if_snd)) { 847 IF_DROP(&ifp->if_snd); 848 error = ENOBUFS; 849 goto qfull; 850 } 851 IF_ENQUEUE(&ifp->if_snd, m); 852 if (vv_softc[ifp->if_unit].vs_oactive == 0) 853 vvstart(ifp->if_unit); 854 splx(s); 855 return (0); 856 qfull: 857 m0 = m; 858 splx(s); 859 bad: 860 m_freem(m0); 861 return(error); 862 } 863 864 /* 865 * vvprt_hdr(s, v) print the local net header in "v" 866 * with title is "s" 867 */ 868 vvprt_hdr(s, v) 869 char *s; 870 register struct vv_header *v; 871 { 872 printf("%s: dsvti: 0x%x 0x%x 0x%x 0x%x 0x%x\n", 873 s, 874 0xff & (int)(v->vh_dhost), 0xff & (int)(v->vh_shost), 875 0xff & (int)(v->vh_version), 0xff & (int)(v->vh_type), 876 0xffff & (int)(v->vh_info)); 877 } 878 879 /* 880 * print "l" hex bytes starting at "s" 881 */ 882 vvprt_hex(s, l) 883 char *s; 884 int l; 885 { 886 register int i; 887 register int z; 888 889 for (i=0 ; i < l; i++) { 890 z = 0xff & (int)(*(s + i)); 891 printf("%c%c ", 892 "0123456789abcdef"[(z >> 4) & 0x0f], 893 "0123456789abcdef"[z & 0x0f] 894 ); 895 } 896 } 897