1 /* if_pcl.c 4.3 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]; 115 116 sc->sc_if.if_unit = ui->ui_unit; 117 sc->sc_if.if_name = "pcl"; 118 sc->sc_if.if_mtu = PCLMTU; 119 sc->sc_if.if_init = pclinit; 120 sc->sc_if.if_output = pcloutput; 121 sc->sc_if.if_ioctl = pclioctl; 122 sc->sc_if.if_reset = pclreset; 123 sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; 124 if_attach(&sc->sc_if); 125 } 126 127 /* 128 * Reset of interface after UNIBUS reset. 129 * If interface is on specified uba, reset its state. 130 */ 131 pclreset(unit, uban) 132 int unit, uban; 133 { 134 register struct uba_device *ui; 135 136 if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || 137 ui->ui_ubanum != uban) 138 return; 139 printf(" pcl%d", unit); 140 pclinit(unit); 141 } 142 143 /* 144 * Initialization of interface; clear recorded pending 145 * operations, and reinitialize UNIBUS usage. 146 */ 147 pclinit(unit) 148 int unit; 149 { 150 register struct pcl_softc *sc = &pcl_softc[unit]; 151 register struct uba_device *ui = pclinfo[unit]; 152 register struct pcldevice *addr; 153 struct sockaddr_in *sin; 154 int s; 155 156 sin = (struct sockaddr_in *)&sc->sc_if.if_addr; 157 if (sin->sin_addr.s_addr == 0) 158 return; 159 if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, 160 (int)btoc(PCLMTU)) == 0) { 161 printf("pcl%d: can't init\n", unit); 162 sc->sc_if.if_flags &= ~IFF_UP; 163 return; 164 } 165 addr = (struct pcldevice *)ui->ui_addr; 166 addr->pcl_rcr = PCL_RCINIT; 167 addr->pcl_tcr = PCL_TXINIT; 168 169 /* 170 * Hang a receive and start any 171 * pending writes by faking a transmit complete. 172 */ 173 s = splimp(); 174 addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; 175 addr->pcl_rdbc = -PCLMTU; 176 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | 177 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 178 sc->sc_oactive = 0; 179 sc->sc_if.if_flags |= IFF_UP|IFF_RUNNING; 180 pclstart(unit); 181 splx(s); 182 /* Set up routing table entry */ 183 if_rtinit(&sc->sc_if, RTF_UP); 184 } 185 186 /* 187 * PCL output routine. 188 */ 189 pcloutput(ifp, m, dst) 190 struct ifnet *ifp; 191 struct mbuf *m; 192 struct sockaddr *dst; 193 { 194 int dest, s, error; 195 struct pcl_header *pclp; 196 struct mbuf *m2; 197 198 switch (dst->sa_family) { 199 200 #ifdef INET 201 case AF_INET: 202 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 203 dest = ntohl((u_long)dest); /* ??? */ 204 dest = dest & 0xff; 205 break; 206 #endif 207 default: 208 printf("pcl%d: can't handle af%d\n", ifp->if_unit, 209 dst->sa_family); 210 error = EAFNOSUPPORT; 211 goto bad; 212 } 213 214 /* 215 * Add pseudo local net header. 216 * Actually, it does not get transmitted, but merely stripped 217 * off and used by the START routine to route the packet. 218 * If no space in first mbuf, allocate another. 219 */ 220 if (m->m_off > MMAXOFF || 221 MMINOFF + sizeof (struct pcl_header) > m->m_off) { 222 m2 = m_get(M_DONTWAIT, MT_HEADER); 223 if (m2 == 0) { 224 error = ENOBUFS; 225 goto bad; 226 } 227 m2->m_next = m; 228 m2->m_off = MMINOFF; 229 m2->m_len = sizeof (struct pcl_header); 230 m = m2; 231 } else { 232 m->m_off -= sizeof (struct pcl_header); 233 m->m_len += sizeof (struct pcl_header); 234 } 235 pclp = mtod(m, struct pcl_header *); 236 pclp->pcl_dest = dest; 237 238 /* 239 * Queue message on interface, and start output if interface 240 * not yet active. 241 */ 242 s = splimp(); 243 if (IF_QFULL(&ifp->if_snd)) { 244 IF_DROP(&ifp->if_snd); 245 error = ENOBUFS; 246 goto qfull; 247 } 248 IF_ENQUEUE(&ifp->if_snd, m); 249 if (pcl_softc[ifp->if_unit].sc_oactive == 0) 250 pclstart(ifp->if_unit); 251 splx(s); 252 return (0); 253 qfull: 254 splx(s); 255 bad: 256 m_freem(m); 257 return (error); 258 } 259 260 /* 261 * Start or restart output on interface. 262 * If interface is already active, then this is a retransmit. 263 * If interface is not already active, get another datagram 264 * to send off of the interface queue, and map it to the interface 265 * before starting the output. 266 */ 267 pclstart(dev) 268 dev_t dev; 269 { 270 int unit = PCLUNIT(dev); 271 struct uba_device *ui = pclinfo[unit]; 272 register struct pcl_softc *sc = &pcl_softc[unit]; 273 register struct pcldevice *addr; 274 struct mbuf *m; 275 276 if (sc->sc_oactive) 277 goto restart; 278 279 /* 280 * Not already active: dequeue another request 281 * and map it to the UNIBUS. If no more requests, 282 * just return. 283 */ 284 IF_DEQUEUE(&sc->sc_if.if_snd, m); 285 if (m == 0) { 286 sc->sc_oactive = 0; 287 return; 288 } 289 290 /* 291 * Pull destination node out of pseudo-local net header. 292 * remove it from outbound data. 293 * Note that if_wubaput calls m_bcopy, which is prepared for 294 * m_len to be 0 in the first mbuf in the chain. 295 */ 296 sc->sc_odest = mtod(m, struct pcl_header *)->pcl_dest; 297 m->m_off += sizeof (struct pcl_header); 298 m->m_len -= sizeof (struct pcl_header); 299 300 /* Map out to the DMA area */ 301 sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); 302 303 restart: 304 /* 305 * Have request mapped to UNIBUS for transmission. 306 * Purge any stale data from this BDP, and start the otput. 307 */ 308 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 309 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); 310 addr = (struct pcldevice *)ui->ui_addr; 311 addr->pcl_tcr = PCL_TXINIT; 312 addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; 313 addr->pcl_tsbc = -sc->sc_olen; 314 315 /* 316 * RIB (retry if busy) is used on the second and subsequent packets 317 * to a single host, because TCP often wants to transmit multiple 318 * buffers in a row, 319 * and if they are all going to the same place, the second and 320 * subsequent ones may be lost due to receiver not ready again yet. 321 * This can cause serious problems, because the TCP will resend the 322 * whole window, which just repeats the problem. The result is that 323 * a perfectly good link appears not to work unless we take steps here. 324 */ 325 addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 326 ((sc->sc_odest & 0xF)<<8) | 327 PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 328 (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); 329 sc->sc_lastdest = sc->sc_odest; 330 sc->sc_oactive = 1; 331 } 332 333 /* 334 * PCL transmitter interrupt. 335 * Start another output if more data to send. 336 */ 337 pclxint(unit) 338 int unit; 339 { 340 register struct uba_device *ui = pclinfo[unit]; 341 register struct pcl_softc *sc = &pcl_softc[unit]; 342 register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; 343 344 if (sc->sc_oactive == 0) { 345 printf ("pcl%d: stray interrupt\n", unit); 346 return; 347 } 348 if (addr->pcl_tsr & PCL_ERR) { 349 sc->sc_lastdest = 0; /* don't bother with RIB */ 350 if (addr->pcl_tsr & PCL_MSTDWN) { 351 addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; 352 pclstart(unit); /* Retry */ 353 printf("pcl%d: master\n", unit ); 354 return; 355 } 356 if (addr->pcl_tsr & PCL_RESPB) { 357 /* Log as an error */ 358 printf("pcl%d: send error, tcr=%b tsr=%b\n", 359 unit, addr->pcl_tcr, PCL_TCSRBITS, 360 addr->pcl_tsr, PCL_TERRBITS); 361 sc->sc_if.if_oerrors++; 362 } 363 } else 364 sc->sc_if.if_opackets++; 365 sc->sc_oactive = 0; 366 if (sc->sc_ifuba.ifu_xtofree) { 367 m_freem(sc->sc_ifuba.ifu_xtofree); 368 sc->sc_ifuba.ifu_xtofree = 0; 369 } 370 pclstart(unit); 371 } 372 373 /* 374 * PCL interface receiver interrupt. 375 * If input error just drop packet. 376 */ 377 pclrint(unit) 378 int unit; 379 { 380 register struct pcl_softc *sc = &pcl_softc[unit]; 381 struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; 382 struct mbuf *m; 383 int len; 384 register struct ifqueue *inq; 385 386 sc->sc_if.if_ipackets++; 387 /* 388 * Purge BDP; drop if input error indicated. 389 */ 390 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 391 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); 392 if (addr->pcl_rsr & PCL_ERR) { 393 printf("pcl%d: rcv error, rcr=%b rsr=%b\n", 394 unit, addr->pcl_rcr, PCL_RCSRBITS, 395 addr->pcl_rsr, PCL_RERRBITS); 396 sc->sc_if.if_ierrors++; 397 goto setup; 398 } 399 len = PCLMTU + addr->pcl_rdbc; 400 if (len <= 0 || len > PCLMTU) { 401 printf("pcl%d: bad len=%d.\n", unit, len); 402 sc->sc_if.if_ierrors++; 403 goto setup; 404 } 405 406 /* Really short packets will be part of the startup sequence */ 407 if (len <= 4) { 408 /* Later, do comming-up processing here */ 409 goto setup; /* drop packet */ 410 } 411 412 /* 413 * Pull packet off interface. 414 */ 415 m = if_rubaget(&sc->sc_ifuba, len, 0); 416 if (m == 0) 417 goto setup; 418 419 schednetisr(NETISR_IP); 420 inq = &ipintrq; 421 422 if (IF_QFULL(inq)) { 423 IF_DROP(inq); 424 m_freem(m); 425 } else 426 IF_ENQUEUE(inq, m); 427 setup: 428 /* 429 * Reset for next packet. 430 */ 431 addr->pcl_rcr = PCL_RCINIT; 432 addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; 433 addr->pcl_rdbc = -PCLMTU; 434 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 435 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 436 } 437 438 /* 439 * Process an ioctl request. 440 */ 441 pclioctl(ifp, cmd, data) 442 register struct ifnet *ifp; 443 int cmd; 444 caddr_t data; 445 { 446 struct ifreq *ifr = (struct ifreq *)data; 447 struct sockaddr_in *sin; 448 int s = splimp(), error = 0; 449 450 switch (cmd) { 451 452 case SIOCSIFADDR: 453 if (ifp->if_flags & IFF_RUNNING) 454 if_rtinit(ifp, -1); /* delete previous route */ 455 sin = (struct sockaddr_in *)&ifr->ifr_addr; 456 ifp->if_addr = *(struct sockaddr *)sin; 457 ifp->if_net = in_netof(sin->sin_addr); 458 ifp->if_host[0] = in_lnaof(sin->sin_addr); 459 if (ifp->if_flags & IFF_RUNNING) 460 if_rtinit(ifp, RTF_UP); 461 else 462 pclinit(ifp->if_unit); 463 break; 464 465 default: 466 error = EINVAL; 467 } 468 splx(s); 469 return (error); 470 } 471 #endif 472