1 /* if_pcl.c 4.2 83/06/13 */ 2 3 #include "pcl.h" 4 #if NPCL > 0 5 /* 6 * DEC CSS PCL-11B Parallel Communications Interface 7 * 8 * Written by Mike Muuss. 9 */ 10 #include "../machine/pte.h" 11 12 #include "../h/param.h" 13 #include "../h/systm.h" 14 #include "../h/mbuf.h" 15 #include "../h/buf.h" 16 #include "../h/protosw.h" 17 #include "../h/socket.h" 18 #include "../h/vmmac.h" 19 #include "../h/ioctl.h" 20 #include "../h/errno.h" 21 22 #include "../net/if.h" 23 #include "../net/netisr.h" 24 #include "../net/route.h" 25 #include "../netinet/in.h" 26 #include "../netinet/in_systm.h" 27 #include "../netinet/ip.h" 28 #include "../netinet/ip_var.h" 29 30 #include "../vax/cpu.h" 31 #include "../vax/mtpr.h" 32 #include "../vaxif/if_pclreg.h" 33 #include "../vaxif/if_uba.h" 34 #include "../vaxuba/ubareg.h" 35 #include "../vaxuba/ubavar.h" 36 37 /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ 38 #define PCLMTU (1006) /* Max transmission unit (bytes) */ 39 40 int pclprobe(), pclattach(), pclrint(), pclxint(); 41 int pclinit(), pclioctl(), pcloutput(), pclreset(); 42 43 struct uba_device *pclinfo[NPCL]; 44 u_short pclstd[] = { 0 }; 45 #define PCLUNIT(x) minor(x) 46 struct uba_driver pcldriver = 47 { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; 48 49 /* 50 * PCL software status per interface. 51 * 52 * Each interface is referenced by a network interface structure, 53 * sc_if, which the routing code uses to locate the interface. 54 * This structure contains the output queue for the interface, its address, ... 55 * We also have, for each interface, a UBA interface structure, which 56 * contains information about the UNIBUS resources held by the interface: 57 * map registers, buffered data paths, etc. Information is cached in this 58 * structure for use by the if_uba.c routines in running the interface 59 * efficiently. 60 */ 61 struct pcl_softc { 62 struct ifnet sc_if; /* network-visible interface */ 63 struct ifuba sc_ifuba; /* UNIBUS resources */ 64 short sc_oactive; /* is output active? */ 65 short sc_olen; /* length of last output */ 66 short sc_lastdest; /* previous destination */ 67 short sc_odest; /* current xmit destination */ 68 short sc_pattern; /* identification pattern */ 69 } pcl_softc[NPCL]; 70 71 /* 72 * Structure of "local header", which only goes between 73 * pcloutput and pclstart. 74 */ 75 struct pcl_header { 76 short pcl_dest; /* Destination PCL station */ 77 }; 78 79 /* 80 * Do non-DMA output of 1 word to determine presence of interface, 81 * and to find the interupt vector. 1 word messages are a special 82 * case in the receiver routine, and will be discarded. 83 */ 84 pclprobe(reg) 85 caddr_t reg; 86 { 87 register int br, cvec; /* r11, r10 value-result */ 88 register struct pcldevice *addr = (struct pcldevice *)reg; 89 90 #ifdef lint 91 br = 0; cvec = br; br = cvec; 92 pclrint(0); pclxint(0); 93 #endif 94 addr->pcl_rcr = PCL_RCINIT; 95 addr->pcl_tcr = PCL_TXINIT; 96 addr->pcl_tsba = 0xFFFE; 97 /* going for 01777776 */ 98 addr->pcl_tsbc = -4; /* really short */ 99 addr->pcl_tcr = 100 ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; 101 DELAY(100000); 102 addr->pcl_tcr = PCL_TXINIT; 103 return (sizeof (struct pcldevice)); 104 } 105 106 /* 107 * Interface exists: make available by filling in network interface 108 * record. System will initialize the interface when it is ready 109 * to accept packets. 110 */ 111 pclattach(ui) 112 struct uba_device *ui; 113 { 114 register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; 115 register struct sockaddr_in *sin; 116 117 sc->sc_if.if_unit = ui->ui_unit; 118 sc->sc_if.if_name = "pcl"; 119 sc->sc_if.if_mtu = PCLMTU; 120 sc->sc_if.if_init = pclinit; 121 sc->sc_if.if_output = pcloutput; 122 sc->sc_if.if_ioctl = pclioctl; 123 sc->sc_if.if_reset = pclreset; 124 sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; 125 if_attach(&sc->sc_if); 126 } 127 128 /* 129 * Reset of interface after UNIBUS reset. 130 * If interface is on specified uba, reset its state. 131 */ 132 pclreset(unit, uban) 133 int unit, uban; 134 { 135 register struct uba_device *ui; 136 137 if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || 138 ui->ui_ubanum != uban) 139 return; 140 printf(" pcl%d", unit); 141 pclinit(unit); 142 } 143 144 /* 145 * Initialization of interface; clear recorded pending 146 * operations, and reinitialize UNIBUS usage. 147 */ 148 pclinit(unit) 149 int unit; 150 { 151 register struct pcl_softc *sc = &pcl_softc[unit]; 152 register struct uba_device *ui = pclinfo[unit]; 153 register struct pcldevice *addr; 154 struct sockaddr_in *sin; 155 int s; 156 157 sin = &sc->sc_if.if_addr; 158 if (sin->sin_addr.s_addr == 0) 159 return; 160 if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, 161 (int)btoc(PCLMTU)) == 0) { 162 printf("pcl%d: can't init\n", unit); 163 sc->sc_if.if_flags &= ~IFF_UP; 164 return; 165 } 166 addr = (struct pcldevice *)ui->ui_addr; 167 addr->pcl_rcr = PCL_RCINIT; 168 addr->pcl_tcr = PCL_TXINIT; 169 170 /* 171 * Hang a receive and start any 172 * pending writes by faking a transmit complete. 173 */ 174 s = splimp(); 175 addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; 176 addr->pcl_rdbc = -PCLMTU; 177 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | 178 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 179 sc->sc_oactive = 0; 180 sc->sc_if.if_flags |= IFF_UP|IFF_RUNNING; 181 pclstart(unit); 182 splx(s); 183 /* Set up routing table entry */ 184 if_rtinit(&sc->sc_if, RTF_UP); 185 } 186 187 /* 188 * PCL output routine. 189 */ 190 pcloutput(ifp, m, dst) 191 struct ifnet *ifp; 192 struct mbuf *m; 193 struct sockaddr *dst; 194 { 195 int type, dest, s, error; 196 struct pcl_header *pclp; 197 struct mbuf *m2; 198 199 switch (dst->sa_family) { 200 201 #ifdef INET 202 case AF_INET: 203 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 204 dest = ntohl(dest); /* ??? */ 205 dest = dest & 0xff; 206 break; 207 #endif 208 default: 209 printf("pcl%d: can't handle af%d\n", ifp->if_unit, 210 dst->sa_family); 211 error = EAFNOSUPPORT; 212 goto bad; 213 } 214 215 /* 216 * Add pseudo local net header. 217 * Actually, it does not get transmitted, but merely stripped 218 * off and used by the START routine to route the packet. 219 * If no space in first mbuf, allocate another. 220 */ 221 if (m->m_off > MMAXOFF || 222 MMINOFF + sizeof (struct pcl_header) > m->m_off) { 223 m2 = m_get(M_DONTWAIT, MT_HEADER); 224 if (m2 == 0) { 225 error = ENOBUFS; 226 goto bad; 227 } 228 m2->m_next = m; 229 m2->m_off = MMINOFF; 230 m2->m_len = sizeof (struct pcl_header); 231 m = m2; 232 } else { 233 m->m_off -= sizeof (struct pcl_header); 234 m->m_len += sizeof (struct pcl_header); 235 } 236 pclp = mtod(m, struct pcl_header *); 237 pclp->pcl_dest = dest; 238 239 /* 240 * Queue message on interface, and start output if interface 241 * not yet active. 242 */ 243 s = splimp(); 244 if (IF_QFULL(&ifp->if_snd)) { 245 IF_DROP(&ifp->if_snd); 246 error = ENOBUFS; 247 goto qfull; 248 } 249 IF_ENQUEUE(&ifp->if_snd, m); 250 if (pcl_softc[ifp->if_unit].sc_oactive == 0) 251 pclstart(ifp->if_unit); 252 splx(s); 253 return (0); 254 qfull: 255 splx(s); 256 bad: 257 m_freem(m); 258 return (error); 259 } 260 261 /* 262 * Start or restart output on interface. 263 * If interface is already active, then this is a retransmit. 264 * If interface is not already active, get another datagram 265 * to send off of the interface queue, and map it to the interface 266 * before starting the output. 267 */ 268 pclstart(dev) 269 dev_t dev; 270 { 271 int unit = PCLUNIT(dev); 272 struct uba_device *ui = pclinfo[unit]; 273 register struct pcl_softc *sc = &pcl_softc[unit]; 274 register struct pcldevice *addr; 275 struct mbuf *m; 276 277 if (sc->sc_oactive) 278 goto restart; 279 280 /* 281 * Not already active: dequeue another request 282 * and map it to the UNIBUS. If no more requests, 283 * just return. 284 */ 285 IF_DEQUEUE(&sc->sc_if.if_snd, m); 286 if (m == 0) { 287 sc->sc_oactive = 0; 288 return; 289 } 290 291 /* 292 * Pull destination node out of pseudo-local net header. 293 * remove it from outbound data. 294 * Note that if_wubaput calls m_bcopy, which is prepared for 295 * m_len to be 0 in the first mbuf in the chain. 296 */ 297 sc->sc_odest = mtod(m, struct pcl_header *)->pcl_dest; 298 m->m_off += sizeof (struct pcl_header); 299 m->m_len -= sizeof (struct pcl_header); 300 301 /* Map out to the DMA area */ 302 sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); 303 304 restart: 305 /* 306 * Have request mapped to UNIBUS for transmission. 307 * Purge any stale data from this BDP, and start the otput. 308 */ 309 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 310 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); 311 addr = (struct pcldevice *)ui->ui_addr; 312 addr->pcl_tcr = PCL_TXINIT; 313 addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; 314 addr->pcl_tsbc = -sc->sc_olen; 315 316 /* 317 * RIB (retry if busy) is used on the second and subsequent packets 318 * to a single host, because TCP often wants to transmit multiple 319 * buffers in a row, 320 * and if they are all going to the same place, the second and 321 * subsequent ones may be lost due to receiver not ready again yet. 322 * This can cause serious problems, because the TCP will resend the 323 * whole window, which just repeats the problem. The result is that 324 * a perfectly good link appears not to work unless we take steps here. 325 */ 326 addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 327 ((sc->sc_odest & 0xF)<<8) | 328 PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 329 (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); 330 sc->sc_lastdest = sc->sc_odest; 331 sc->sc_oactive = 1; 332 } 333 334 /* 335 * PCL transmitter interrupt. 336 * Start another output if more data to send. 337 */ 338 pclxint(unit) 339 int unit; 340 { 341 register struct uba_device *ui = pclinfo[unit]; 342 register struct pcl_softc *sc = &pcl_softc[unit]; 343 register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; 344 345 if (sc->sc_oactive == 0) { 346 printf ("pcl%d: stray interrupt\n", unit); 347 return; 348 } 349 if (addr->pcl_tsr & PCL_ERR) { 350 sc->sc_lastdest = 0; /* don't bother with RIB */ 351 if (addr->pcl_tsr & PCL_MSTDWN) { 352 addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; 353 pclstart(unit); /* Retry */ 354 printf("pcl%d: master\n", unit ); 355 return; 356 } 357 if (addr->pcl_tsr & PCL_RESPB) { 358 /* Log as an error */ 359 printf("pcl%d: send error, tcr=%b tsr=%b\n", 360 unit, addr->pcl_tcr, PCL_TCSRBITS, 361 addr->pcl_tsr, PCL_TERRBITS); 362 sc->sc_if.if_oerrors++; 363 } 364 } else 365 sc->sc_if.if_opackets++; 366 sc->sc_oactive = 0; 367 if (sc->sc_ifuba.ifu_xtofree) { 368 m_freem(sc->sc_ifuba.ifu_xtofree); 369 sc->sc_ifuba.ifu_xtofree = 0; 370 } 371 pclstart(unit); 372 } 373 374 /* 375 * PCL interface receiver interrupt. 376 * If input error just drop packet. 377 */ 378 pclrint(unit) 379 int unit; 380 { 381 register struct pcl_softc *sc = &pcl_softc[unit]; 382 struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; 383 struct mbuf *m; 384 int len, plen; short resid; 385 register struct ifqueue *inq; 386 int off; 387 388 sc->sc_if.if_ipackets++; 389 /* 390 * Purge BDP; drop if input error indicated. 391 */ 392 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 393 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); 394 if (addr->pcl_rsr & PCL_ERR) { 395 printf("pcl%d: rcv error, rcr=%b rsr=%b\n", 396 unit, addr->pcl_rcr, PCL_RCSRBITS, 397 addr->pcl_rsr, PCL_RERRBITS); 398 sc->sc_if.if_ierrors++; 399 goto setup; 400 } 401 len = PCLMTU + addr->pcl_rdbc; 402 if (len <= 0 || len > PCLMTU) { 403 printf("pcl%d: bad len=%d.\n", unit, len); 404 sc->sc_if.if_ierrors++; 405 goto setup; 406 } 407 408 /* Really short packets will be part of the startup sequence */ 409 if (len <= 4) { 410 /* Later, do comming-up processing here */ 411 goto setup; /* drop packet */ 412 } 413 414 /* 415 * Pull packet off interface. 416 */ 417 m = if_rubaget(&sc->sc_ifuba, len, 0); 418 if (m == 0) 419 goto setup; 420 421 schednetisr(NETISR_IP); 422 inq = &ipintrq; 423 424 if (IF_QFULL(inq)) { 425 IF_DROP(inq); 426 m_freem(m); 427 } else 428 IF_ENQUEUE(inq, m); 429 setup: 430 /* 431 * Reset for next packet. 432 */ 433 addr->pcl_rcr = PCL_RCINIT; 434 addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; 435 addr->pcl_rdbc = -PCLMTU; 436 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 437 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 438 } 439 440 /* 441 * Process an ioctl request. 442 */ 443 pclioctl(ifp, cmd, data) 444 register struct ifnet *ifp; 445 int cmd; 446 caddr_t data; 447 { 448 struct ifreq *ifr = (struct ifreq *)data; 449 struct sockaddr_in *sin; 450 int s = splimp(), error = 0; 451 452 switch (cmd) { 453 454 case SIOCSIFADDR: 455 if (ifp->if_flags & IFF_RUNNING) 456 if_rtinit(ifp, -1); /* delete previous route */ 457 sin = (struct sockaddr_in *)&ifr->ifr_addr; 458 ifp->if_addr = *sin; 459 ifp->if_net = in_netof(sin->sin_addr); 460 ifp->if_host[0] = in_lnaof(sin->sin_addr); 461 if (ifp->if_flags & IFF_RUNNING) 462 if_rtinit(ifp, RTF_UP); 463 else 464 pclinit(ifp->if_unit); 465 break; 466 467 default: 468 error = EINVAL; 469 } 470 splx(s); 471 return (error); 472 } 473 #endif 474