1 /* if_vv.c 4.16 83/05/01 */ 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 * UNTESTED WITH 4.1C 12 */ 13 #include "../machine/pte.h" 14 15 #include "../h/param.h" 16 #include "../h/systm.h" 17 #include "../h/mbuf.h" 18 #include "../h/buf.h" 19 #include "../h/protosw.h" 20 #include "../h/socket.h" 21 #include "../h/vmmac.h" 22 #include "../h/errno.h" 23 #include "../h/time.h" 24 #include "../h/kernel.h" 25 26 #include "../net/if.h" 27 #include "../net/netisr.h" 28 #include "../net/route.h" 29 30 #include "../netinet/in.h" 31 #include "../netinet/in_systm.h" 32 #include "../netinet/ip.h" 33 #include "../netinet/ip_var.h" 34 35 #include "../vax/mtpr.h" 36 #include "../vax/cpu.h" 37 38 #include "../vaxuba/ubareg.h" 39 #include "../vaxuba/ubavar.h" 40 41 #include "../vaxif/if_vv.h" 42 #include "../vaxif/if_uba.h" 43 44 /* 45 * N.B. - if WIRECENTER is defined wrong, it can well break 46 * the hardware!! 47 */ 48 #define WIRECENTER 49 50 #ifdef WIRECENTER 51 #define VV_CONF VV_HEN /* drive wire center relay */ 52 #else 53 #define VV_CONF VV_STE /* allow operation without wire center */ 54 #endif 55 56 #define VVMTU (1024+512) 57 #define VVMRU (1024+512+16) /* space for trailer */ 58 59 int vv_dotrailer = 0, /* 1 => do trailer protocol */ 60 vv_tracehdr = 0, /* 1 => trace headers (slowly!!) */ 61 vv_tracetimeout = 1; /* 1 => trace input error-rate limiting */ 62 vv_logreaderrors = 0; /* 1 => log all read errors */ 63 64 #define vvtracehdr if (vv_tracehdr) vvprt_hdr 65 #define vvtrprintf if (vv_tracetimeout) printf 66 67 int vv_ticking = 0; /* error flywheel is running */ 68 69 /* 70 * Interval in HZ - 50 msec. 71 * N.B. all times below are in units of flywheel ticks 72 */ 73 #define VV_FLYWHEEL 3 74 #define VV_ERRORTHRESHOLD 100 /* errors/flywheel-interval */ 75 #define VV_MODE1ATTEMPTS 10 /* number mode 1 retries */ 76 #define VV_MODE1DELAY 2 /* period interface is PAUSEd - 100ms */ 77 #define VV_MODE2DELAY 4 /* base interval host relay is off - 200ms */ 78 #define VV_MAXDELAY 6400 /* max interval host relay is off - 2 minutes */ 79 80 int vvprobe(), vvattach(), vvrint(), vvxint(); 81 struct uba_device *vvinfo[NVV]; 82 u_short vvstd[] = { 0 }; 83 struct uba_driver vvdriver = 84 { vvprobe, 0, vvattach, 0, vvstd, "vv", vvinfo }; 85 #define VVUNIT(x) minor(x) 86 int vvinit(),vvoutput(),vvreset(); 87 88 /* 89 * Software status of each interface. 90 * 91 * Each interface is referenced by a network interface structure, 92 * vs_if, which the routing code uses to locate the interface. 93 * This structure contains the output queue for the interface, its address, ... 94 * We also have, for each interface, a UBA interface structure, which 95 * contains information about the UNIBUS resources held by the interface: 96 * map registers, buffered data paths, etc. Information is cached in this 97 * structure for use by the if_uba.c routines in running the interface 98 * efficiently. 99 */ 100 struct vv_softc { 101 struct ifnet vs_if; /* network-visible interface */ 102 struct ifuba vs_ifuba; /* UNIBUS resources */ 103 short vs_oactive; /* is output active */ 104 short vs_iactive; /* is input active */ 105 short vs_olen; /* length of last output */ 106 u_short vs_lastx; /* last destination address */ 107 short vs_tries; /* transmit current retry count */ 108 short vs_init; /* number of ring inits */ 109 short vs_nottaken; /* number of packets refused */ 110 /* input error rate limiting state */ 111 short vs_major; /* recovery major state */ 112 short vs_minor; /* recovery minor state */ 113 short vs_retry; /* recovery retry count */ 114 short vs_delayclock; /* recovery delay clock */ 115 short vs_delayrange; /* increasing delay interval */ 116 short vs_dropped; /* number of packes tossed in last dt */ 117 } vv_softc[NVV]; 118 119 /* 120 * States of vs_iactive. 121 */ 122 #define ACTIVE 1 /* interface should post new receives */ 123 #define PAUSE 0 /* interface should NOT post new receives */ 124 #define OPEN -1 /* PAUSE and open host relay */ 125 126 /* 127 * Recovery major states. 128 */ 129 #define MODE0 0 /* everything is wonderful */ 130 #define MODE1 1 /* hopefully whatever will go away */ 131 #define MODE2 2 /* drastic measures - open host relay for increasing intervals */ 132 133 vvprobe(reg) 134 caddr_t reg; 135 { 136 register int br, cvec; 137 register struct vvreg *addr = (struct vvreg *)reg; 138 139 #ifdef lint 140 br = 0; cvec = br; br = cvec; 141 #endif 142 /* reset interface, enable, and wait till dust settles */ 143 addr->vvicsr = VV_RST; 144 addr->vvocsr = VV_RST; 145 DELAY(100000); 146 /* generate interrupt by doing 1 word DMA from 0 in uba space!! */ 147 addr->vvocsr = VV_IEN; /* enable interrupt */ 148 addr->vvoba = 0; /* low 16 bits */ 149 addr->vvoea = 0; /* extended bits */ 150 addr->vvowc = -1; /* for 1 word */ 151 addr->vvocsr |= VV_DEN; /* start the DMA */ 152 DELAY(100000); 153 addr->vvocsr = 0; 154 if (cvec && cvec != 0x200) 155 cvec -= 4; /* backup so vector => recieve */ 156 return(1); 157 } 158 159 /* 160 * Interface exists: make available by filling in network interface 161 * record. System will initialize the interface when it is ready 162 * to accept packets. 163 */ 164 vvattach(ui) 165 struct uba_device *ui; 166 { 167 register struct vv_softc *vs = &vv_softc[ui->ui_unit]; 168 register struct sockaddr_in *sin; 169 170 vs->vs_if.if_unit = ui->ui_unit; 171 vs->vs_if.if_name = "vv"; 172 vs->vs_if.if_mtu = VVMTU; 173 vs->vs_if.if_net = ui->ui_flags; 174 vs->vs_if.if_host[0] = 0; /* this will be reset in vvinit() */ 175 sin = (struct sockaddr_in *)&vs->vs_if.if_addr; 176 sin->sin_family = AF_INET; 177 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, vs->vs_if.if_host[0]); 178 sin = (struct sockaddr_in *)&vs->vs_if.if_broadaddr; 179 sin->sin_family = AF_INET; 180 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, VV_BROADCAST); 181 vs->vs_if.if_flags = IFF_BROADCAST; 182 vs->vs_if.if_init = vvinit; 183 vs->vs_if.if_output = vvoutput; 184 vs->vs_if.if_reset = vvreset; 185 vs->vs_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEEDBDP | UBA_NEED16; 186 if_attach(&vs->vs_if); 187 } 188 189 /* 190 * Reset of interface after UNIBUS reset. 191 * If interface is on specified uba, reset its state. 192 */ 193 vvreset(unit, uban) 194 int unit, uban; 195 { 196 register struct uba_device *ui; 197 198 if (unit >= NVV || (ui = vvinfo[unit]) == 0 || ui->ui_alive == 0 || 199 ui->ui_ubanum != uban) 200 return; 201 printf(" vv%d", unit); 202 vvinit(unit); 203 } 204 205 /* 206 * Initialization of interface; clear recorded pending 207 * operations, and reinitialize UNIBUS usage. 208 */ 209 vvinit(unit) 210 int unit; 211 { 212 register struct vv_softc *vs = &vv_softc[unit]; 213 register struct uba_device *ui = vvinfo[unit]; 214 register struct vvreg *addr; 215 struct sockaddr_in *sin; 216 int ubainfo, s; 217 int vvtimeout(); 218 219 addr = (struct vvreg *)ui->ui_addr; 220 if (if_ubainit(&vs->vs_ifuba, ui->ui_ubanum, 221 sizeof (struct vv_header), (int)btoc(VVMTU)) == 0) { 222 printf("vv%d: can't initialize\n", unit); 223 vs->vs_if.if_flags &= ~IFF_UP; 224 return; 225 } 226 if (vv_ticking++ == 0) 227 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 228 /* 229 * Discover our host address and post it 230 */ 231 vs->vs_if.if_host[0] = vvidentify(unit); 232 printf("vv%d: host %d\n", unit, vs->vs_if.if_host[0]); 233 sin = (struct sockaddr_in *)&vs->vs_if.if_addr; 234 sin->sin_family = AF_INET; 235 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, vs->vs_if.if_host[0]); 236 237 /* 238 * Reset the interface, and join the ring 239 */ 240 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 241 addr->vvicsr = VV_RST | VV_CONF; /* close logical relay */ 242 sleep((caddr_t)&lbolt, PZERO); /* let contacts settle */ 243 vs->vs_init = 0; 244 vs->vs_dropped = 0; 245 vs->vs_nottaken = 0; 246 247 /* 248 * Hang a receive and start any 249 * pending writes by faking a transmit complete. 250 */ 251 s = splimp(); 252 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 253 addr->vviba = (u_short) ubainfo; 254 addr->vviea = (u_short) (ubainfo >> 16); 255 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 256 addr->vvicsr = VV_IEN | VV_CONF | VV_DEN | VV_ENB; 257 vs->vs_iactive = ACTIVE; 258 vs->vs_oactive = 1; 259 vs->vs_if.if_flags |= IFF_UP; 260 vvxint(unit); 261 splx(s); 262 if_rtinit(&vs->vs_if, RTF_UP); 263 } 264 265 /* 266 * vvidentify() - return our host address 267 */ 268 vvidentify(unit) 269 { 270 register struct vv_softc *vs = &vv_softc[unit]; 271 register struct uba_device *ui = vvinfo[unit]; 272 register struct vvreg *addr; 273 struct mbuf *m; 274 struct vv_header *v; 275 int ubainfo, retrying, attempts, waitcount, s; 276 277 /* 278 * Build a multicast message to identify our address 279 */ 280 addr = (struct vvreg *)ui->ui_addr; 281 attempts = 0; /* total attempts, including bad msg type */ 282 retrying = 0; /* first time through */ 283 m = m_get(M_DONTWAIT, MT_HEADER); 284 if (m == 0) 285 panic("vvinit: can't get mbuf"); 286 m->m_next = 0; 287 m->m_off = MMINOFF; 288 m->m_len = sizeof(struct vv_header); 289 v = mtod(m, struct vv_header *); 290 v->vh_dhost = VV_BROADCAST; /* multicast destination address */ 291 v->vh_shost = 0; /* will be overwritten with ours */ 292 v->vh_version = RING_VERSION; 293 v->vh_type = RING_WHOAMI; 294 v->vh_info = 0; 295 /* map xmit message into uba */ 296 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 297 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 298 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 299 /* 300 * Reset interface, establish Digital Loopback Mode, and 301 * send the multicast (to myself) with Input Copy enabled. 302 */ 303 retry: 304 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 305 addr->vvicsr = VV_RST; 306 addr->vviba = (u_short) ubainfo; 307 addr->vviea = (u_short) (ubainfo >> 16); 308 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 309 addr->vvicsr = VV_STE | VV_DEN | VV_ENB | VV_LPB; 310 311 /* let flag timers fire so ring will initialize */ 312 DELAY(2000000); 313 314 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 315 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 316 addr->vvoba = (u_short) ubainfo; 317 addr->vvoea = (u_short) (ubainfo >> 16); 318 addr->vvowc = -((vs->vs_olen + 1) >> 1); 319 addr->vvocsr = VV_CPB | VV_DEN | VV_INR | VV_ENB; 320 /* 321 * Wait for receive side to finish. 322 * Extract source address (which will our own), 323 * and post to interface structure. 324 */ 325 DELAY(1000); 326 for (waitcount = 0; (addr->vvicsr & VV_RDY) == 0; waitcount++) { 327 if (waitcount < 10) { 328 DELAY(1000); 329 continue; 330 } 331 if (attempts++ >= 10) { 332 printf("vv%d: can't initialize\n", unit); 333 printf("vvinit loopwait: icsr = %b\n", 334 0xffff&(addr->vvicsr), VV_IBITS); 335 vs->vs_if.if_flags &= ~IFF_UP; 336 return; 337 } 338 goto retry; 339 } 340 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 341 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 342 if (vs->vs_ifuba.ifu_xtofree) 343 m_freem(vs->vs_ifuba.ifu_xtofree); 344 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 345 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 346 m = if_rubaget(&vs->vs_ifuba, sizeof(struct vv_header), 0); 347 if (m != NULL) 348 m_freem(m); 349 /* 350 * Check message type before we believe the source host address 351 */ 352 v = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 353 if (v->vh_type != RING_WHOAMI) 354 goto retry; 355 return(v->vh_shost); 356 } 357 358 /* 359 * vvtimeout() - called by timer flywheel to monitor input packet 360 * discard rate. Interfaces getting too many errors are shut 361 * down for a while. If the condition persists, the interface 362 * is marked down. 363 */ 364 vvtimeout(junk) 365 int junk; 366 { 367 register struct vv_softc *vs; 368 register int i; 369 register struct vvreg *addr; 370 int ubainfo; 371 372 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 373 for (i = 0; i < NVV; i++) { 374 vs = &vv_softc[i]; 375 addr = (struct vvreg *)vvinfo[i]->ui_addr; 376 if (vs->vs_if.if_flags & IFF_UP == 0) continue; 377 switch (vs->vs_major) { 378 379 /* 380 * MODE0: generally OK, just check error rate 381 */ 382 case MODE0: 383 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 384 vs->vs_dropped = 0; 385 continue; 386 } 387 /* suspend reads for a while */ 388 vvtrprintf("vv%d going MODE1 in vvtimeout\n",i); 389 vs->vs_major = MODE1; 390 vs->vs_iactive = PAUSE; /* no new reads */ 391 vs->vs_retry = VV_MODE1ATTEMPTS; 392 vs->vs_delayclock = VV_MODE1DELAY; 393 vs->vs_minor = 0; 394 continue; 395 396 /* 397 * MODE1: excessive error rate observed 398 * Scheme: try simply suspending reads for a 399 * short while a small number of times 400 */ 401 case MODE1: 402 if (vs->vs_delayclock > 0) { 403 vs->vs_delayclock--; 404 continue; 405 } 406 switch (vs->vs_minor) { 407 408 case 0: /* reenable reads */ 409 vvtrprintf("vv%d M1m0\n",i); 410 vs->vs_dropped = 0; 411 vs->vs_iactive = ACTIVE; 412 vs->vs_minor = 1; /* next state */ 413 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 414 addr->vviba = (u_short) ubainfo; 415 addr->vviea = (u_short) (ubainfo >> 16); 416 addr->vviwc = 417 -(sizeof (struct vv_header) + VVMTU) >> 1; 418 addr->vvicsr = VV_RST | VV_CONF; 419 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 420 continue; 421 422 case 1: /* see if it worked */ 423 vvtrprintf("vv%d M1m1\n",i); 424 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 425 vs->vs_dropped = 0; 426 vs->vs_major = MODE0; /* yeah!! */ 427 continue; 428 } 429 if (vs->vs_retry -- > 0) { 430 vs->vs_dropped = 0; 431 vs->vs_iactive = PAUSE; 432 vs->vs_delayclock = VV_MODE1DELAY; 433 vs->vs_minor = 0; /* recheck */ 434 continue; 435 } 436 vs->vs_major = MODE2; 437 vs->vs_minor = 0; 438 vs->vs_dropped = 0; 439 vs->vs_iactive = OPEN; 440 vs->vs_delayrange = VV_MODE2DELAY; 441 vs->vs_delayclock = VV_MODE2DELAY; 442 /* fall thru ... */ 443 } 444 445 /* 446 * MODE2: simply ignoring traffic didn't relieve condition 447 * Scheme: open host relay for intervals linearly 448 * increasing up to some maximum of a several minutes. 449 * This allows broken networks to return to operation 450 * without rebooting. 451 */ 452 case MODE2: 453 if (vs->vs_delayclock > 0) { 454 vs->vs_delayclock--; 455 continue; 456 } 457 switch (vs->vs_minor) { 458 459 case 0: /* close relay and reenable reads */ 460 vvtrprintf("vv%d M2m0\n",i); 461 vs->vs_dropped = 0; 462 vs->vs_iactive = ACTIVE; 463 vs->vs_minor = 1; /* next state */ 464 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 465 addr->vviba = (u_short) ubainfo; 466 addr->vviea = (u_short) (ubainfo >> 16); 467 addr->vviwc = 468 -(sizeof (struct vv_header) + VVMTU) >> 1; 469 addr->vvicsr = VV_RST | VV_CONF; 470 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 471 continue; 472 473 case 1: /* see if it worked */ 474 vvtrprintf("vv%d M2m1\n",i); 475 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 476 vs->vs_dropped = 0; 477 vs->vs_major = MODE0; /* yeah!! */ 478 continue; 479 } 480 vvtrprintf("vv%d M2m1 ++ delay\n",i); 481 vs->vs_dropped = 0; 482 vs->vs_iactive = OPEN; 483 vs->vs_minor = 0; 484 if (vs->vs_delayrange < VV_MAXDELAY) 485 vs->vs_delayrange += 486 (vs->vs_delayrange/2); 487 vs->vs_delayclock = vs->vs_delayrange; 488 continue; 489 } 490 491 default: 492 printf("vv%d: major state screwed\n", i); 493 vs->vs_if.if_flags &= ~IFF_UP; 494 } 495 } 496 } 497 498 /* 499 * Start or restart output on interface. 500 * If interface is active, this is a retransmit, so just 501 * restuff registers and go. 502 * If interface is not already active, get another datagram 503 * to send off of the interface queue, and map it to the interface 504 * before starting the output. 505 */ 506 vvstart(dev) 507 dev_t dev; 508 { 509 int unit = VVUNIT(dev); 510 struct uba_device *ui = vvinfo[unit]; 511 register struct vv_softc *vs = &vv_softc[unit]; 512 register struct vvreg *addr; 513 struct mbuf *m; 514 int ubainfo; 515 int dest; 516 517 if (vs->vs_oactive) 518 goto restart; 519 /* 520 * Not already active: dequeue another request 521 * and map it to the UNIBUS. If no more requests, 522 * just return. 523 */ 524 IF_DEQUEUE(&vs->vs_if.if_snd, m); 525 if (m == NULL) { 526 vs->vs_oactive = 0; 527 return; 528 } 529 dest = mtod(m, struct vv_header *)->vh_dhost; 530 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 531 vs->vs_lastx = dest; 532 restart: 533 /* 534 * Have request mapped to UNIBUS for transmission. 535 * Purge any stale data from this BDP, and start the otput. 536 */ 537 if (vs->vs_olen > VVMTU + sizeof (struct vvheader)) { 538 printf("vv%d vs_olen: %d > VVMTU\n", unit, vs->vs_olen); 539 panic("vvdriver vs_olen botch"); 540 } 541 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 542 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 543 addr = (struct vvreg *)ui->ui_addr; 544 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 545 addr->vvoba = (u_short) ubainfo; 546 addr->vvoea = (u_short) (ubainfo >> 16); 547 addr->vvowc = -((vs->vs_olen + 1) >> 1); 548 addr->vvocsr = VV_IEN | VV_CPB | VV_DEN | VV_INR | VV_ENB; 549 vs->vs_oactive = 1; 550 } 551 552 /* 553 * VVLNI transmit interrupt 554 * Start another output if more data to send. 555 */ 556 vvxint(unit) 557 int unit; 558 { 559 register struct uba_device *ui = vvinfo[unit]; 560 register struct vv_softc *vs = &vv_softc[unit]; 561 register struct vvreg *addr; 562 register int oc; 563 564 addr = (struct vvreg *)ui->ui_addr; 565 oc = 0xffff & (addr->vvocsr); 566 if (vs->vs_oactive == 0) { 567 printf("vv%d: stray interrupt vvocsr = %b\n", unit, 568 oc, VV_OBITS); 569 return; 570 } 571 if (oc & (VV_OPT | VV_RFS)) { 572 vs->vs_if.if_collisions++; 573 if (vs->vs_tries++ < VVRETRY) { 574 if (oc & VV_OPT) 575 vs->vs_init++; 576 if (oc & VV_RFS) 577 vs->vs_nottaken++; 578 vvstart(unit); /* restart this message */ 579 return; 580 } 581 if (oc & VV_OPT) 582 printf("vv%d: output timeout\n"); 583 } 584 vs->vs_if.if_opackets++; 585 vs->vs_oactive = 0; 586 vs->vs_tries = 0; 587 if (oc & VVXERR) { 588 vs->vs_if.if_oerrors++; 589 printf("vv%d: error vvocsr = %b\n", unit, 0xffff & oc, 590 VV_OBITS); 591 } 592 if (vs->vs_ifuba.ifu_xtofree) { 593 m_freem(vs->vs_ifuba.ifu_xtofree); 594 vs->vs_ifuba.ifu_xtofree = 0; 595 } 596 if (vs->vs_if.if_snd.ifq_head == 0) { 597 vs->vs_lastx = 256; /* an invalid address */ 598 return; 599 } 600 vvstart(unit); 601 } 602 603 /* 604 * V2lni interface receiver interrupt. 605 * If input error just drop packet. 606 * Otherwise purge input buffered data path and examine 607 * packet to determine type. If can't determine length 608 * from type, then have to drop packet. Othewise decapsulate 609 * packet based on type and pass to type specific higher-level 610 * input routine. 611 */ 612 vvrint(unit) 613 int unit; 614 { 615 register struct vv_softc *vs = &vv_softc[unit]; 616 struct vvreg *addr = (struct vvreg *)vvinfo[unit]->ui_addr; 617 register struct vv_header *vv; 618 register struct ifqueue *inq; 619 struct mbuf *m; 620 int ubainfo, len, off; 621 short resid; 622 623 vs->vs_if.if_ipackets++; 624 /* 625 * Purge BDP; drop if input error indicated. 626 */ 627 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 628 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 629 if (addr->vvicsr & VVRERR) { 630 if (vv_logreaderrors) 631 printf("vv%d: error vvicsr = %b\n", unit, 632 0xffff&(addr->vvicsr), VV_IBITS); 633 goto dropit; 634 } 635 636 /* 637 * Get packet length from word count residue 638 * 639 * Compute header offset if trailer protocol 640 * 641 * Pull packet off interface. Off is nonzero if packet 642 * has trailing header; if_rubaget will then force this header 643 * information to be at the front. The vh_info field 644 * carries the offset to the trailer data in trailer 645 * format packets. 646 */ 647 vv = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 648 vvtracehdr("vi", vv); 649 resid = addr->vviwc; 650 if (resid) 651 resid |= 0176000; /* ugly!!!! */ 652 len = (((sizeof (struct vv_header) + VVMRU) >> 1) + resid) << 1; 653 len -= sizeof(struct vv_header); 654 if (len > VVMRU || len <= 0) 655 goto dropit; 656 #define vvdataaddr(vv, off, type) ((type)(((caddr_t)((vv)+1)+(off)))) 657 if (vv_dotrailer && vv->vh_type >= RING_IPTrailer && 658 vv->vh_type < RING_IPTrailer+RING_IPNTrailer){ 659 off = (vv->vh_type - RING_IPTrailer) * 512; 660 if (off > VVMTU) 661 goto dropit; 662 vv->vh_type = *vvdataaddr(vv, off, u_short *); 663 resid = *(vvdataaddr(vv, off+2, u_short *)); 664 if (off + resid > len) 665 goto dropit; 666 len = off + resid; 667 } else 668 off = 0; 669 if (len == 0) 670 goto dropit; 671 m = if_rubaget(&vs->vs_ifuba, len, off); 672 if (m == NULL) 673 goto dropit; 674 if (off) { 675 m->m_off += 2 * sizeof(u_short); 676 m->m_len -= 2 * sizeof(u_short); 677 } 678 679 /* 680 * Demultiplex on packet type 681 */ 682 switch (vv->vh_type) { 683 684 #ifdef INET 685 case RING_IP: 686 schednetisr(NETISR_IP); 687 inq = &ipintrq; 688 break; 689 #endif 690 default: 691 printf("vv%d: unknown pkt type 0x%x\n", unit, vv->vh_type); 692 m_freem(m); 693 goto setup; 694 } 695 if (IF_QFULL(inq)) { 696 IF_DROP(inq); 697 m_freem(m); 698 } else 699 IF_ENQUEUE(inq, m); 700 setup: 701 /* 702 * Check the error rate and start recovery if needed 703 * this has to go here since the timer flywheel runs at 704 * a lower ipl and never gets a chance to change the mode 705 */ 706 if (vs->vs_major == MODE0 && vs->vs_dropped > VV_ERRORTHRESHOLD) { 707 vvtrprintf("vv%d going MODE1 in vvrint\n",unit); 708 vs->vs_major = MODE1; 709 vs->vs_iactive = PAUSE; /* no new reads */ 710 vs->vs_retry = VV_MODE1ATTEMPTS; 711 vs->vs_delayclock = VV_MODE1DELAY; 712 vs->vs_minor = 0; 713 vs->vs_dropped = 0; 714 } 715 switch (vs->vs_iactive) { 716 717 case ACTIVE: /* Restart the read for next packet */ 718 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 719 addr->vviba = (u_short) ubainfo; 720 addr->vviea = (u_short) (ubainfo >> 16); 721 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 722 addr->vvicsr = VV_RST | VV_CONF; 723 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 724 return; 725 726 case PAUSE: /* requested to not start any new reads */ 727 vs->vs_dropped = 0; 728 return; 729 730 case OPEN: /* request to open host relay */ 731 vs->vs_dropped = 0; 732 addr->vvicsr = 0; 733 return; 734 735 default: 736 printf("vv%d: vs_iactive = %d\n", unit, vs->vs_iactive); 737 return; 738 } 739 /* 740 * Drop packet on floor -- count them!! 741 */ 742 dropit: 743 vs->vs_if.if_ierrors++; 744 vs->vs_dropped++; 745 /* 746 printf("vv%d: error vvicsr = %b\n", unit, 747 0xffff&(addr->vvicsr), VV_IBITS); 748 */ 749 goto setup; 750 } 751 752 /* 753 * V2lni output routine. 754 * Encapsulate a packet of type family for the local net. 755 * Use trailer local net encapsulation if enough data in first 756 * packet leaves a multiple of 512 bytes of data in remainder. 757 */ 758 vvoutput(ifp, m0, dst) 759 struct ifnet *ifp; 760 struct mbuf *m0; 761 struct sockaddr *dst; 762 { 763 register struct mbuf *m = m0; 764 register struct vv_header *vv; 765 register int off; 766 int type, dest, s, error; 767 768 switch (dst->sa_family) { 769 770 #ifdef INET 771 case AF_INET: { 772 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 773 if ((dest = in_lnaof(*((struct in_addr *)&dest))) >= 0x100) { 774 error = EPERM; 775 goto bad; 776 } 777 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 778 if (vv_dotrailer && off > 0 && (off & 0x1ff) == 0 && 779 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 780 type = RING_IPTrailer + (off>>9); 781 m->m_off -= 2 * sizeof (u_short); 782 m->m_len += 2 * sizeof (u_short); 783 *mtod(m, u_short *) = RING_IP; 784 *(mtod(m, u_short *) + 1) = m->m_len; 785 goto gottrailertype; 786 } 787 type = RING_IP; 788 off = 0; 789 goto gottype; 790 } 791 #endif 792 default: 793 printf("vv%d: can't handle af%d\n", ifp->if_unit, 794 dst->sa_family); 795 error = EAFNOSUPPORT; 796 goto bad; 797 } 798 799 gottrailertype: 800 /* 801 * Packet to be sent as trailer: move first packet 802 * (control information) to end of chain. 803 */ 804 while (m->m_next) 805 m = m->m_next; 806 m->m_next = m0; 807 m = m0->m_next; 808 m0->m_next = 0; 809 m0 = m; 810 gottype: 811 /* 812 * Add local net header. If no space in first mbuf, 813 * allocate another. 814 */ 815 if (m->m_off > MMAXOFF || 816 MMINOFF + sizeof (struct vv_header) > m->m_off) { 817 m = m_get(M_DONTWAIT, MT_HEADER); 818 if (m == NULL) { 819 error = ENOBUFS; 820 goto bad; 821 } 822 m->m_next = m0; 823 m->m_off = MMINOFF; 824 m->m_len = sizeof (struct vv_header); 825 } else { 826 m->m_off -= sizeof (struct vv_header); 827 m->m_len += sizeof (struct vv_header); 828 } 829 vv = mtod(m, struct vv_header *); 830 vv->vh_shost = ifp->if_host[0]; 831 vv->vh_dhost = dest; 832 vv->vh_version = RING_VERSION; 833 vv->vh_type = type; 834 vv->vh_info = off; 835 vvtracehdr("vo", vv); 836 837 /* 838 * Queue message on interface, and start output if interface 839 * not yet active. 840 */ 841 s = splimp(); 842 if (IF_QFULL(&ifp->if_snd)) { 843 IF_DROP(&ifp->if_snd); 844 error = ENOBUFS; 845 goto qfull; 846 } 847 IF_ENQUEUE(&ifp->if_snd, m); 848 if (vv_softc[ifp->if_unit].vs_oactive == 0) 849 vvstart(ifp->if_unit); 850 splx(s); 851 return (0); 852 qfull: 853 m0 = m; 854 splx(s); 855 bad: 856 m_freem(m0); 857 return(error); 858 } 859 860 /* 861 * vvprt_hdr(s, v) print the local net header in "v" 862 * with title is "s" 863 */ 864 vvprt_hdr(s, v) 865 char *s; 866 register struct vv_header *v; 867 { 868 printf("%s: dsvti: 0x%x 0x%x 0x%x 0x%x 0x%x\n", 869 s, 870 0xff & (int)(v->vh_dhost), 0xff & (int)(v->vh_shost), 871 0xff & (int)(v->vh_version), 0xff & (int)(v->vh_type), 872 0xffff & (int)(v->vh_info)); 873 } 874 875 /* 876 * print "l" hex bytes starting at "s" 877 */ 878 vvprt_hex(s, l) 879 char *s; 880 int l; 881 { 882 register int i; 883 register int z; 884 885 for (i=0 ; i < l; i++) { 886 z = 0xff & (int)(*(s + i)); 887 printf("%c%c ", 888 "0123456789abcdef"[(z >> 4) & 0x0f], 889 "0123456789abcdef"[z & 0x0f] 890 ); 891 } 892 } 893