1 /* if_vv.c 4.17 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_attach(&vs->vs_if); 186 } 187 188 /* 189 * Reset of interface after UNIBUS reset. 190 * If interface is on specified uba, reset its state. 191 */ 192 vvreset(unit, uban) 193 int unit, uban; 194 { 195 register struct uba_device *ui; 196 197 if (unit >= NVV || (ui = vvinfo[unit]) == 0 || ui->ui_alive == 0 || 198 ui->ui_ubanum != uban) 199 return; 200 printf(" vv%d", unit); 201 vvinit(unit); 202 } 203 204 /* 205 * Initialization of interface; clear recorded pending 206 * operations, and reinitialize UNIBUS usage. 207 */ 208 vvinit(unit) 209 int unit; 210 { 211 register struct vv_softc *vs = &vv_softc[unit]; 212 register struct uba_device *ui = vvinfo[unit]; 213 register struct vvreg *addr; 214 struct sockaddr_in *sin; 215 int ubainfo, s; 216 int vvtimeout(); 217 218 addr = (struct vvreg *)ui->ui_addr; 219 if (if_ubainit(&vs->vs_ifuba, ui->ui_ubanum, 220 sizeof (struct vv_header), (int)btoc(VVMTU)) == 0) { 221 printf("vv%d: can't initialize\n", unit); 222 vs->vs_if.if_flags &= ~IFF_UP; 223 return; 224 } 225 if (vv_ticking++ == 0) 226 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 227 /* 228 * Discover our host address and post it 229 */ 230 vs->vs_if.if_host[0] = vvidentify(unit); 231 printf("vv%d: host %d\n", unit, vs->vs_if.if_host[0]); 232 sin = (struct sockaddr_in *)&vs->vs_if.if_addr; 233 sin->sin_family = AF_INET; 234 sin->sin_addr = if_makeaddr(vs->vs_if.if_net, vs->vs_if.if_host[0]); 235 236 /* 237 * Reset the interface, and join the ring 238 */ 239 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 240 addr->vvicsr = VV_RST | VV_CONF; /* close logical relay */ 241 DELAY(500000); /* let contacts settle */ 242 vs->vs_init = 0; 243 vs->vs_dropped = 0; 244 vs->vs_nottaken = 0; 245 246 /* 247 * Hang a receive and start any 248 * pending writes by faking a transmit complete. 249 */ 250 s = splimp(); 251 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 252 addr->vviba = (u_short) ubainfo; 253 addr->vviea = (u_short) (ubainfo >> 16); 254 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 255 addr->vvicsr = VV_IEN | VV_CONF | VV_DEN | VV_ENB; 256 vs->vs_iactive = ACTIVE; 257 vs->vs_oactive = 1; 258 vs->vs_if.if_flags |= IFF_UP; 259 vvxint(unit); 260 splx(s); 261 if_rtinit(&vs->vs_if, RTF_UP); 262 } 263 264 /* 265 * vvidentify() - return our host address 266 */ 267 vvidentify(unit) 268 { 269 register struct vv_softc *vs = &vv_softc[unit]; 270 register struct uba_device *ui = vvinfo[unit]; 271 register struct vvreg *addr; 272 struct mbuf *m; 273 struct vv_header *v; 274 int ubainfo, retrying, attempts, waitcount, s; 275 276 /* 277 * Build a multicast message to identify our address 278 */ 279 addr = (struct vvreg *)ui->ui_addr; 280 attempts = 0; /* total attempts, including bad msg type */ 281 retrying = 0; /* first time through */ 282 m = m_get(M_DONTWAIT, MT_HEADER); 283 if (m == 0) 284 panic("vvinit: can't get mbuf"); 285 m->m_next = 0; 286 m->m_off = MMINOFF; 287 m->m_len = sizeof(struct vv_header); 288 v = mtod(m, struct vv_header *); 289 v->vh_dhost = VV_BROADCAST; /* multicast destination address */ 290 v->vh_shost = 0; /* will be overwritten with ours */ 291 v->vh_version = RING_VERSION; 292 v->vh_type = RING_WHOAMI; 293 v->vh_info = 0; 294 /* map xmit message into uba */ 295 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 296 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 297 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 298 /* 299 * Reset interface, establish Digital Loopback Mode, and 300 * send the multicast (to myself) with Input Copy enabled. 301 */ 302 retry: 303 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 304 addr->vvicsr = VV_RST; 305 addr->vviba = (u_short) ubainfo; 306 addr->vviea = (u_short) (ubainfo >> 16); 307 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 308 addr->vvicsr = VV_STE | VV_DEN | VV_ENB | VV_LPB; 309 310 /* let flag timers fire so ring will initialize */ 311 DELAY(2000000); 312 313 addr->vvocsr = VV_RST | VV_CPB; /* clear packet buffer */ 314 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 315 addr->vvoba = (u_short) ubainfo; 316 addr->vvoea = (u_short) (ubainfo >> 16); 317 addr->vvowc = -((vs->vs_olen + 1) >> 1); 318 addr->vvocsr = VV_CPB | VV_DEN | VV_INR | VV_ENB; 319 /* 320 * Wait for receive side to finish. 321 * Extract source address (which will our own), 322 * and post to interface structure. 323 */ 324 DELAY(1000); 325 for (waitcount = 0; (addr->vvicsr & VV_RDY) == 0; waitcount++) { 326 if (waitcount < 10) { 327 DELAY(1000); 328 continue; 329 } 330 if (attempts++ >= 10) { 331 printf("vv%d: can't initialize\n", unit); 332 printf("vvinit loopwait: icsr = %b\n", 333 0xffff&(addr->vvicsr), VV_IBITS); 334 vs->vs_if.if_flags &= ~IFF_UP; 335 return; 336 } 337 goto retry; 338 } 339 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 340 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 341 if (vs->vs_ifuba.ifu_xtofree) 342 m_freem(vs->vs_ifuba.ifu_xtofree); 343 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 344 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 345 m = if_rubaget(&vs->vs_ifuba, sizeof(struct vv_header), 0); 346 if (m != NULL) 347 m_freem(m); 348 /* 349 * Check message type before we believe the source host address 350 */ 351 v = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 352 if (v->vh_type != RING_WHOAMI) 353 goto retry; 354 return(v->vh_shost); 355 } 356 357 /* 358 * vvtimeout() - called by timer flywheel to monitor input packet 359 * discard rate. Interfaces getting too many errors are shut 360 * down for a while. If the condition persists, the interface 361 * is marked down. 362 */ 363 vvtimeout(junk) 364 int junk; 365 { 366 register struct vv_softc *vs; 367 register int i; 368 register struct vvreg *addr; 369 int ubainfo; 370 371 timeout(vvtimeout, (caddr_t) 0, VV_FLYWHEEL); 372 for (i = 0; i < NVV; i++) { 373 vs = &vv_softc[i]; 374 addr = (struct vvreg *)vvinfo[i]->ui_addr; 375 if (vs->vs_if.if_flags & IFF_UP == 0) continue; 376 switch (vs->vs_major) { 377 378 /* 379 * MODE0: generally OK, just check error rate 380 */ 381 case MODE0: 382 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 383 vs->vs_dropped = 0; 384 continue; 385 } 386 /* suspend reads for a while */ 387 vvtrprintf("vv%d going MODE1 in vvtimeout\n",i); 388 vs->vs_major = MODE1; 389 vs->vs_iactive = PAUSE; /* no new reads */ 390 vs->vs_retry = VV_MODE1ATTEMPTS; 391 vs->vs_delayclock = VV_MODE1DELAY; 392 vs->vs_minor = 0; 393 continue; 394 395 /* 396 * MODE1: excessive error rate observed 397 * Scheme: try simply suspending reads for a 398 * short while a small number of times 399 */ 400 case MODE1: 401 if (vs->vs_delayclock > 0) { 402 vs->vs_delayclock--; 403 continue; 404 } 405 switch (vs->vs_minor) { 406 407 case 0: /* reenable reads */ 408 vvtrprintf("vv%d M1m0\n",i); 409 vs->vs_dropped = 0; 410 vs->vs_iactive = ACTIVE; 411 vs->vs_minor = 1; /* next state */ 412 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 413 addr->vviba = (u_short) ubainfo; 414 addr->vviea = (u_short) (ubainfo >> 16); 415 addr->vviwc = 416 -(sizeof (struct vv_header) + VVMTU) >> 1; 417 addr->vvicsr = VV_RST | VV_CONF; 418 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 419 continue; 420 421 case 1: /* see if it worked */ 422 vvtrprintf("vv%d M1m1\n",i); 423 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 424 vs->vs_dropped = 0; 425 vs->vs_major = MODE0; /* yeah!! */ 426 continue; 427 } 428 if (vs->vs_retry -- > 0) { 429 vs->vs_dropped = 0; 430 vs->vs_iactive = PAUSE; 431 vs->vs_delayclock = VV_MODE1DELAY; 432 vs->vs_minor = 0; /* recheck */ 433 continue; 434 } 435 vs->vs_major = MODE2; 436 vs->vs_minor = 0; 437 vs->vs_dropped = 0; 438 vs->vs_iactive = OPEN; 439 vs->vs_delayrange = VV_MODE2DELAY; 440 vs->vs_delayclock = VV_MODE2DELAY; 441 /* fall thru ... */ 442 } 443 444 /* 445 * MODE2: simply ignoring traffic didn't relieve condition 446 * Scheme: open host relay for intervals linearly 447 * increasing up to some maximum of a several minutes. 448 * This allows broken networks to return to operation 449 * without rebooting. 450 */ 451 case MODE2: 452 if (vs->vs_delayclock > 0) { 453 vs->vs_delayclock--; 454 continue; 455 } 456 switch (vs->vs_minor) { 457 458 case 0: /* close relay and reenable reads */ 459 vvtrprintf("vv%d M2m0\n",i); 460 vs->vs_dropped = 0; 461 vs->vs_iactive = ACTIVE; 462 vs->vs_minor = 1; /* next state */ 463 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 464 addr->vviba = (u_short) ubainfo; 465 addr->vviea = (u_short) (ubainfo >> 16); 466 addr->vviwc = 467 -(sizeof (struct vv_header) + VVMTU) >> 1; 468 addr->vvicsr = VV_RST | VV_CONF; 469 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 470 continue; 471 472 case 1: /* see if it worked */ 473 vvtrprintf("vv%d M2m1\n",i); 474 if (vs->vs_dropped < VV_ERRORTHRESHOLD) { 475 vs->vs_dropped = 0; 476 vs->vs_major = MODE0; /* yeah!! */ 477 continue; 478 } 479 vvtrprintf("vv%d M2m1 ++ delay\n",i); 480 vs->vs_dropped = 0; 481 vs->vs_iactive = OPEN; 482 vs->vs_minor = 0; 483 if (vs->vs_delayrange < VV_MAXDELAY) 484 vs->vs_delayrange += 485 (vs->vs_delayrange/2); 486 vs->vs_delayclock = vs->vs_delayrange; 487 continue; 488 } 489 490 default: 491 printf("vv%d: major state screwed\n", i); 492 vs->vs_if.if_flags &= ~IFF_UP; 493 } 494 } 495 } 496 497 /* 498 * Start or restart output on interface. 499 * If interface is active, this is a retransmit, so just 500 * restuff registers and go. 501 * If interface is not already active, get another datagram 502 * to send off of the interface queue, and map it to the interface 503 * before starting the output. 504 */ 505 vvstart(dev) 506 dev_t dev; 507 { 508 int unit = VVUNIT(dev); 509 struct uba_device *ui = vvinfo[unit]; 510 register struct vv_softc *vs = &vv_softc[unit]; 511 register struct vvreg *addr; 512 struct mbuf *m; 513 int ubainfo; 514 int dest; 515 516 if (vs->vs_oactive) 517 goto restart; 518 /* 519 * Not already active: dequeue another request 520 * and map it to the UNIBUS. If no more requests, 521 * just return. 522 */ 523 IF_DEQUEUE(&vs->vs_if.if_snd, m); 524 if (m == NULL) { 525 vs->vs_oactive = 0; 526 return; 527 } 528 dest = mtod(m, struct vv_header *)->vh_dhost; 529 vs->vs_olen = if_wubaput(&vs->vs_ifuba, m); 530 vs->vs_lastx = dest; 531 restart: 532 /* 533 * Have request mapped to UNIBUS for transmission. 534 * Purge any stale data from this BDP, and start the otput. 535 */ 536 if (vs->vs_olen > VVMTU + sizeof (struct vvheader)) { 537 printf("vv%d vs_olen: %d > VVMTU\n", unit, vs->vs_olen); 538 panic("vvdriver vs_olen botch"); 539 } 540 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 541 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_w.ifrw_bdp); 542 addr = (struct vvreg *)ui->ui_addr; 543 ubainfo = vs->vs_ifuba.ifu_w.ifrw_info; 544 addr->vvoba = (u_short) ubainfo; 545 addr->vvoea = (u_short) (ubainfo >> 16); 546 addr->vvowc = -((vs->vs_olen + 1) >> 1); 547 addr->vvocsr = VV_IEN | VV_CPB | VV_DEN | VV_INR | VV_ENB; 548 vs->vs_oactive = 1; 549 } 550 551 /* 552 * VVLNI transmit interrupt 553 * Start another output if more data to send. 554 */ 555 vvxint(unit) 556 int unit; 557 { 558 register struct uba_device *ui = vvinfo[unit]; 559 register struct vv_softc *vs = &vv_softc[unit]; 560 register struct vvreg *addr; 561 register int oc; 562 563 addr = (struct vvreg *)ui->ui_addr; 564 oc = 0xffff & (addr->vvocsr); 565 if (vs->vs_oactive == 0) { 566 printf("vv%d: stray interrupt vvocsr = %b\n", unit, 567 oc, VV_OBITS); 568 return; 569 } 570 if (oc & (VV_OPT | VV_RFS)) { 571 vs->vs_if.if_collisions++; 572 if (vs->vs_tries++ < VVRETRY) { 573 if (oc & VV_OPT) 574 vs->vs_init++; 575 if (oc & VV_RFS) 576 vs->vs_nottaken++; 577 vvstart(unit); /* restart this message */ 578 return; 579 } 580 if (oc & VV_OPT) 581 printf("vv%d: output timeout\n"); 582 } 583 vs->vs_if.if_opackets++; 584 vs->vs_oactive = 0; 585 vs->vs_tries = 0; 586 if (oc & VVXERR) { 587 vs->vs_if.if_oerrors++; 588 printf("vv%d: error vvocsr = %b\n", unit, 0xffff & oc, 589 VV_OBITS); 590 } 591 if (vs->vs_ifuba.ifu_xtofree) { 592 m_freem(vs->vs_ifuba.ifu_xtofree); 593 vs->vs_ifuba.ifu_xtofree = 0; 594 } 595 if (vs->vs_if.if_snd.ifq_head == 0) { 596 vs->vs_lastx = 256; /* an invalid address */ 597 return; 598 } 599 vvstart(unit); 600 } 601 602 /* 603 * V2lni interface receiver interrupt. 604 * If input error just drop packet. 605 * Otherwise purge input buffered data path and examine 606 * packet to determine type. If can't determine length 607 * from type, then have to drop packet. Othewise decapsulate 608 * packet based on type and pass to type specific higher-level 609 * input routine. 610 */ 611 vvrint(unit) 612 int unit; 613 { 614 register struct vv_softc *vs = &vv_softc[unit]; 615 struct vvreg *addr = (struct vvreg *)vvinfo[unit]->ui_addr; 616 register struct vv_header *vv; 617 register struct ifqueue *inq; 618 struct mbuf *m; 619 int ubainfo, len, off; 620 short resid; 621 622 vs->vs_if.if_ipackets++; 623 /* 624 * Purge BDP; drop if input error indicated. 625 */ 626 if (vs->vs_ifuba.ifu_flags & UBA_NEEDBDP) 627 UBAPURGE(vs->vs_ifuba.ifu_uba, vs->vs_ifuba.ifu_r.ifrw_bdp); 628 if (addr->vvicsr & VVRERR) { 629 if (vv_logreaderrors) 630 printf("vv%d: error vvicsr = %b\n", unit, 631 0xffff&(addr->vvicsr), VV_IBITS); 632 goto dropit; 633 } 634 635 /* 636 * Get packet length from word count residue 637 * 638 * Compute header offset if trailer protocol 639 * 640 * Pull packet off interface. Off is nonzero if packet 641 * has trailing header; if_rubaget will then force this header 642 * information to be at the front. The vh_info field 643 * carries the offset to the trailer data in trailer 644 * format packets. 645 */ 646 vv = (struct vv_header *)(vs->vs_ifuba.ifu_r.ifrw_addr); 647 vvtracehdr("vi", vv); 648 resid = addr->vviwc; 649 if (resid) 650 resid |= 0176000; /* ugly!!!! */ 651 len = (((sizeof (struct vv_header) + VVMRU) >> 1) + resid) << 1; 652 len -= sizeof(struct vv_header); 653 if (len > VVMRU || len <= 0) 654 goto dropit; 655 #define vvdataaddr(vv, off, type) ((type)(((caddr_t)((vv)+1)+(off)))) 656 if (vv_dotrailer && vv->vh_type >= RING_IPTrailer && 657 vv->vh_type < RING_IPTrailer+RING_IPNTrailer){ 658 off = (vv->vh_type - RING_IPTrailer) * 512; 659 if (off > VVMTU) 660 goto dropit; 661 vv->vh_type = *vvdataaddr(vv, off, u_short *); 662 resid = *(vvdataaddr(vv, off+2, u_short *)); 663 if (off + resid > len) 664 goto dropit; 665 len = off + resid; 666 } else 667 off = 0; 668 if (len == 0) 669 goto dropit; 670 m = if_rubaget(&vs->vs_ifuba, len, off); 671 if (m == NULL) 672 goto dropit; 673 if (off) { 674 m->m_off += 2 * sizeof(u_short); 675 m->m_len -= 2 * sizeof(u_short); 676 } 677 678 /* 679 * Demultiplex on packet type 680 */ 681 switch (vv->vh_type) { 682 683 #ifdef INET 684 case RING_IP: 685 schednetisr(NETISR_IP); 686 inq = &ipintrq; 687 break; 688 #endif 689 default: 690 printf("vv%d: unknown pkt type 0x%x\n", unit, vv->vh_type); 691 m_freem(m); 692 goto setup; 693 } 694 if (IF_QFULL(inq)) { 695 IF_DROP(inq); 696 m_freem(m); 697 } else 698 IF_ENQUEUE(inq, m); 699 setup: 700 /* 701 * Check the error rate and start recovery if needed 702 * this has to go here since the timer flywheel runs at 703 * a lower ipl and never gets a chance to change the mode 704 */ 705 if (vs->vs_major == MODE0 && vs->vs_dropped > VV_ERRORTHRESHOLD) { 706 vvtrprintf("vv%d going MODE1 in vvrint\n",unit); 707 vs->vs_major = MODE1; 708 vs->vs_iactive = PAUSE; /* no new reads */ 709 vs->vs_retry = VV_MODE1ATTEMPTS; 710 vs->vs_delayclock = VV_MODE1DELAY; 711 vs->vs_minor = 0; 712 vs->vs_dropped = 0; 713 } 714 switch (vs->vs_iactive) { 715 716 case ACTIVE: /* Restart the read for next packet */ 717 ubainfo = vs->vs_ifuba.ifu_r.ifrw_info; 718 addr->vviba = (u_short) ubainfo; 719 addr->vviea = (u_short) (ubainfo >> 16); 720 addr->vviwc = -(sizeof (struct vv_header) + VVMTU) >> 1; 721 addr->vvicsr = VV_RST | VV_CONF; 722 addr->vvicsr |= VV_IEN | VV_DEN | VV_ENB; 723 return; 724 725 case PAUSE: /* requested to not start any new reads */ 726 vs->vs_dropped = 0; 727 return; 728 729 case OPEN: /* request to open host relay */ 730 vs->vs_dropped = 0; 731 addr->vvicsr = 0; 732 return; 733 734 default: 735 printf("vv%d: vs_iactive = %d\n", unit, vs->vs_iactive); 736 return; 737 } 738 /* 739 * Drop packet on floor -- count them!! 740 */ 741 dropit: 742 vs->vs_if.if_ierrors++; 743 vs->vs_dropped++; 744 /* 745 printf("vv%d: error vvicsr = %b\n", unit, 746 0xffff&(addr->vvicsr), VV_IBITS); 747 */ 748 goto setup; 749 } 750 751 /* 752 * V2lni output routine. 753 * Encapsulate a packet of type family for the local net. 754 * Use trailer local net encapsulation if enough data in first 755 * packet leaves a multiple of 512 bytes of data in remainder. 756 */ 757 vvoutput(ifp, m0, dst) 758 struct ifnet *ifp; 759 struct mbuf *m0; 760 struct sockaddr *dst; 761 { 762 register struct mbuf *m = m0; 763 register struct vv_header *vv; 764 register int off; 765 int type, dest, s, error; 766 767 switch (dst->sa_family) { 768 769 #ifdef INET 770 case AF_INET: { 771 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 772 if ((dest = in_lnaof(*((struct in_addr *)&dest))) >= 0x100) { 773 error = EPERM; 774 goto bad; 775 } 776 off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len; 777 if (vv_dotrailer && off > 0 && (off & 0x1ff) == 0 && 778 m->m_off >= MMINOFF + 2 * sizeof (u_short)) { 779 type = RING_IPTrailer + (off>>9); 780 m->m_off -= 2 * sizeof (u_short); 781 m->m_len += 2 * sizeof (u_short); 782 *mtod(m, u_short *) = RING_IP; 783 *(mtod(m, u_short *) + 1) = m->m_len; 784 goto gottrailertype; 785 } 786 type = RING_IP; 787 off = 0; 788 goto gottype; 789 } 790 #endif 791 default: 792 printf("vv%d: can't handle af%d\n", ifp->if_unit, 793 dst->sa_family); 794 error = EAFNOSUPPORT; 795 goto bad; 796 } 797 798 gottrailertype: 799 /* 800 * Packet to be sent as trailer: move first packet 801 * (control information) to end of chain. 802 */ 803 while (m->m_next) 804 m = m->m_next; 805 m->m_next = m0; 806 m = m0->m_next; 807 m0->m_next = 0; 808 m0 = m; 809 gottype: 810 /* 811 * Add local net header. If no space in first mbuf, 812 * allocate another. 813 */ 814 if (m->m_off > MMAXOFF || 815 MMINOFF + sizeof (struct vv_header) > m->m_off) { 816 m = m_get(M_DONTWAIT, MT_HEADER); 817 if (m == NULL) { 818 error = ENOBUFS; 819 goto bad; 820 } 821 m->m_next = m0; 822 m->m_off = MMINOFF; 823 m->m_len = sizeof (struct vv_header); 824 } else { 825 m->m_off -= sizeof (struct vv_header); 826 m->m_len += sizeof (struct vv_header); 827 } 828 vv = mtod(m, struct vv_header *); 829 vv->vh_shost = ifp->if_host[0]; 830 vv->vh_dhost = dest; 831 vv->vh_version = RING_VERSION; 832 vv->vh_type = type; 833 vv->vh_info = off; 834 vvtracehdr("vo", vv); 835 836 /* 837 * Queue message on interface, and start output if interface 838 * not yet active. 839 */ 840 s = splimp(); 841 if (IF_QFULL(&ifp->if_snd)) { 842 IF_DROP(&ifp->if_snd); 843 error = ENOBUFS; 844 goto qfull; 845 } 846 IF_ENQUEUE(&ifp->if_snd, m); 847 if (vv_softc[ifp->if_unit].vs_oactive == 0) 848 vvstart(ifp->if_unit); 849 splx(s); 850 return (0); 851 qfull: 852 m0 = m; 853 splx(s); 854 bad: 855 m_freem(m0); 856 return(error); 857 } 858 859 /* 860 * vvprt_hdr(s, v) print the local net header in "v" 861 * with title is "s" 862 */ 863 vvprt_hdr(s, v) 864 char *s; 865 register struct vv_header *v; 866 { 867 printf("%s: dsvti: 0x%x 0x%x 0x%x 0x%x 0x%x\n", 868 s, 869 0xff & (int)(v->vh_dhost), 0xff & (int)(v->vh_shost), 870 0xff & (int)(v->vh_version), 0xff & (int)(v->vh_type), 871 0xffff & (int)(v->vh_info)); 872 } 873 874 /* 875 * print "l" hex bytes starting at "s" 876 */ 877 vvprt_hex(s, l) 878 char *s; 879 int l; 880 { 881 register int i; 882 register int z; 883 884 for (i=0 ; i < l; i++) { 885 z = 0xff & (int)(*(s + i)); 886 printf("%c%c ", 887 "0123456789abcdef"[(z >> 4) & 0x0f], 888 "0123456789abcdef"[z & 0x0f] 889 ); 890 } 891 } 892