1 /* if_pcl.c 4.1 83/03/31 */ 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/errno.h" 20 21 #include "../net/if.h" 22 #include "../net/netisr.h" 23 #include "../net/route.h" 24 #include "../netinet/in.h" 25 #include "../netinet/in_systm.h" 26 #include "../netinet/ip.h" 27 #include "../netinet/ip_var.h" 28 29 #include "../vax/cpu.h" 30 #include "../vax/mtpr.h" 31 #include "../vaxif/if_pclreg.h" 32 #include "../vaxif/if_uba.h" 33 #include "../vaxuba/ubareg.h" 34 #include "../vaxuba/ubavar.h" 35 36 /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ 37 #define PCLMTU (1006) /* Max transmission unit (bytes) */ 38 39 int pclprobe(), pclattach(), pclrint(), pclxint(); 40 int pclinit(),pcloutput(),pclreset(); 41 42 struct uba_device *pclinfo[NPCL]; 43 u_short pclstd[] = { 0 }; 44 #define PCLUNIT(x) minor(x) 45 struct uba_driver pcldriver = 46 { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; 47 48 /* 49 * PCL software status per interface. 50 * 51 * Each interface is referenced by a network interface structure, 52 * sc_if, which the routing code uses to locate the interface. 53 * This structure contains the output queue for the interface, its address, ... 54 * We also have, for each interface, a UBA interface structure, which 55 * contains information about the UNIBUS resources held by the interface: 56 * map registers, buffered data paths, etc. Information is cached in this 57 * structure for use by the if_uba.c routines in running the interface 58 * efficiently. 59 */ 60 struct pcl_softc { 61 struct ifnet sc_if; /* network-visible interface */ 62 struct ifuba sc_ifuba; /* UNIBUS resources */ 63 short sc_oactive; /* is output active? */ 64 short sc_olen; /* length of last output */ 65 short sc_lastdest; /* previous destination */ 66 short sc_odest; /* current xmit destination */ 67 short sc_pattern; /* identification pattern */ 68 } pcl_softc[NPCL]; 69 70 /* 71 * Structure of "local header", which only goes between 72 * pcloutput and pclstart. 73 */ 74 struct pcl_header { 75 short pcl_dest; /* Destination PCL station */ 76 }; 77 78 /* 79 * Do non-DMA output of 1 word to determine presence of interface, 80 * and to find the interupt vector. 1 word messages are a special 81 * case in the receiver routine, and will be discarded. 82 */ 83 pclprobe(reg) 84 caddr_t reg; 85 { 86 register int br, cvec; /* r11, r10 value-result */ 87 register struct pcldevice *addr = (struct pcldevice *)reg; 88 89 #ifdef lint 90 br = 0; cvec = br; br = cvec; 91 pclrint(0); pclxint(0); 92 #endif 93 addr->pcl_rcr = PCL_RCINIT; 94 addr->pcl_tcr = PCL_TXINIT; 95 addr->pcl_tsba = 0xFFFE; 96 /* going for 01777776 */ 97 addr->pcl_tsbc = -4; /* really short */ 98 addr->pcl_tcr = 99 ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; 100 DELAY(100000); 101 addr->pcl_tcr = PCL_TXINIT; 102 return (sizeof (struct pcldevice)); 103 } 104 105 /* 106 * Interface exists: make available by filling in network interface 107 * record. System will initialize the interface when it is ready 108 * to accept packets. 109 */ 110 pclattach(ui) 111 struct uba_device *ui; 112 { 113 register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; 114 register struct sockaddr_in *sin; 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 /* copy network addr from flags long */ 120 sc->sc_if.if_net = in_netof(htonl(ui->ui_flags)); 121 sc->sc_if.if_host[0] = in_lnaof(htonl(ui->ui_flags)); 122 123 sin = (struct sockaddr_in *)&sc->sc_if.if_addr; 124 sin->sin_family = AF_INET; 125 sin->sin_addr.s_addr = htonl(ui->ui_flags); 126 127 sc->sc_if.if_init = pclinit; 128 sc->sc_if.if_output = pcloutput; 129 sc->sc_if.if_reset = pclreset; 130 sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; 131 if_attach(&sc->sc_if); 132 } 133 134 /* 135 * Reset of interface after UNIBUS reset. 136 * If interface is on specified uba, reset its state. 137 */ 138 pclreset(unit, uban) 139 int unit, uban; 140 { 141 register struct uba_device *ui; 142 143 if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || 144 ui->ui_ubanum != uban) 145 return; 146 printf(" pcl%d", unit); 147 pclinit(unit); 148 } 149 150 /* 151 * Initialization of interface; clear recorded pending 152 * operations, and reinitialize UNIBUS usage. 153 */ 154 pclinit(unit) 155 int unit; 156 { 157 register struct pcl_softc *sc = &pcl_softc[unit]; 158 register struct uba_device *ui = pclinfo[unit]; 159 register struct pcldevice *addr; 160 int s; 161 162 if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, 163 (int)btoc(PCLMTU)) == 0) { 164 printf("pcl%d: can't init\n", unit); 165 sc->sc_if.if_flags &= ~IFF_UP; 166 return; 167 } 168 addr = (struct pcldevice *)ui->ui_addr; 169 addr->pcl_rcr = PCL_RCINIT; 170 addr->pcl_tcr = PCL_TXINIT; 171 172 /* 173 * Hang a receive and start any 174 * pending writes by faking a transmit complete. 175 */ 176 s = splimp(); 177 addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; 178 addr->pcl_rdbc = -PCLMTU; 179 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | 180 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 181 sc->sc_oactive = 0; 182 sc->sc_if.if_flags |= IFF_UP; /* Mark interface up */ 183 pclstart(unit); 184 splx(s); 185 /* Set up routing table entry */ 186 if_rtinit(&sc->sc_if, RTF_UP); 187 } 188 189 /* 190 * PCL output routine. 191 */ 192 pcloutput(ifp, m, dst) 193 struct ifnet *ifp; 194 struct mbuf *m; 195 struct sockaddr *dst; 196 { 197 int type, dest, s, error; 198 struct pcl_header *pclp; 199 struct mbuf *m2; 200 201 switch (dst->sa_family) { 202 203 #ifdef INET 204 case AF_INET: 205 dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; 206 dest = ntohl(dest); /* ??? */ 207 dest = dest & 0xff; 208 break; 209 #endif 210 default: 211 printf("pcl%d: can't handle af%d\n", ifp->if_unit, 212 dst->sa_family); 213 error = EAFNOSUPPORT; 214 goto bad; 215 } 216 217 /* 218 * Add pseudo local net header. 219 * Actually, it does not get transmitted, but merely stripped 220 * off and used by the START routine to route the packet. 221 * If no space in first mbuf, allocate another. 222 */ 223 if (m->m_off > MMAXOFF || 224 MMINOFF + sizeof (struct pcl_header) > m->m_off) { 225 m2 = m_get(M_DONTWAIT, MT_HEADER); 226 if (m2 == 0) { 227 error = ENOBUFS; 228 goto bad; 229 } 230 m2->m_next = m; 231 m2->m_off = MMINOFF; 232 m2->m_len = sizeof (struct pcl_header); 233 m = m2; 234 } else { 235 m->m_off -= sizeof (struct pcl_header); 236 m->m_len += sizeof (struct pcl_header); 237 } 238 pclp = mtod(m, struct pcl_header *); 239 pclp->pcl_dest = dest; 240 241 /* 242 * Queue message on interface, and start output if interface 243 * not yet active. 244 */ 245 s = splimp(); 246 if (IF_QFULL(&ifp->if_snd)) { 247 IF_DROP(&ifp->if_snd); 248 error = ENOBUFS; 249 goto qfull; 250 } 251 IF_ENQUEUE(&ifp->if_snd, m); 252 if (pcl_softc[ifp->if_unit].sc_oactive == 0) 253 pclstart(ifp->if_unit); 254 splx(s); 255 return (0); 256 qfull: 257 splx(s); 258 bad: 259 m_freem(m); 260 return (error); 261 } 262 263 /* 264 * Start or restart output on interface. 265 * If interface is already active, then this is a retransmit. 266 * If interface is not already active, get another datagram 267 * to send off of the interface queue, and map it to the interface 268 * before starting the output. 269 */ 270 pclstart(dev) 271 dev_t dev; 272 { 273 int unit = PCLUNIT(dev); 274 struct uba_device *ui = pclinfo[unit]; 275 register struct pcl_softc *sc = &pcl_softc[unit]; 276 register struct pcldevice *addr; 277 struct mbuf *m; 278 279 if (sc->sc_oactive) 280 goto restart; 281 282 /* 283 * Not already active: dequeue another request 284 * and map it to the UNIBUS. If no more requests, 285 * just return. 286 */ 287 IF_DEQUEUE(&sc->sc_if.if_snd, m); 288 if (m == 0) { 289 sc->sc_oactive = 0; 290 return; 291 } 292 293 /* 294 * Pull destination node out of pseudo-local net header. 295 * remove it from outbound data. 296 * Note that if_wubaput calls m_bcopy, which is prepared for 297 * m_len to be 0 in the first mbuf in the chain. 298 */ 299 sc->sc_odest = mtod(m, struct pcl_header *)->pcl_dest; 300 m->m_off += sizeof (struct pcl_header); 301 m->m_len -= sizeof (struct pcl_header); 302 303 /* Map out to the DMA area */ 304 sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); 305 306 restart: 307 /* 308 * Have request mapped to UNIBUS for transmission. 309 * Purge any stale data from this BDP, and start the otput. 310 */ 311 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 312 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); 313 addr = (struct pcldevice *)ui->ui_addr; 314 addr->pcl_tcr = PCL_TXINIT; 315 addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; 316 addr->pcl_tsbc = -sc->sc_olen; 317 318 /* 319 * RIB (retry if busy) is used on the second and subsequent packets 320 * to a single host, because TCP often wants to transmit multiple 321 * buffers in a row, 322 * and if they are all going to the same place, the second and 323 * subsequent ones may be lost due to receiver not ready again yet. 324 * This can cause serious problems, because the TCP will resend the 325 * whole window, which just repeats the problem. The result is that 326 * a perfectly good link appears not to work unless we take steps here. 327 */ 328 addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 329 ((sc->sc_odest & 0xF)<<8) | 330 PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 331 (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); 332 sc->sc_lastdest = sc->sc_odest; 333 sc->sc_oactive = 1; 334 } 335 336 /* 337 * PCL transmitter interrupt. 338 * Start another output if more data to send. 339 */ 340 pclxint(unit) 341 int unit; 342 { 343 register struct uba_device *ui = pclinfo[unit]; 344 register struct pcl_softc *sc = &pcl_softc[unit]; 345 register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; 346 347 if (sc->sc_oactive == 0) { 348 printf ("pcl%d: stray interrupt\n", unit); 349 return; 350 } 351 if (addr->pcl_tsr & PCL_ERR) { 352 sc->sc_lastdest = 0; /* don't bother with RIB */ 353 if (addr->pcl_tsr & PCL_MSTDWN) { 354 addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; 355 pclstart(unit); /* Retry */ 356 printf("pcl%d: master\n", unit ); 357 return; 358 } 359 if (addr->pcl_tsr & PCL_RESPB) { 360 /* Log as an error */ 361 printf("pcl%d: send error, tcr=%b tsr=%b\n", 362 unit, addr->pcl_tcr, PCL_TCSRBITS, 363 addr->pcl_tsr, PCL_TERRBITS); 364 sc->sc_if.if_oerrors++; 365 } 366 } else 367 sc->sc_if.if_opackets++; 368 sc->sc_oactive = 0; 369 if (sc->sc_ifuba.ifu_xtofree) { 370 m_freem(sc->sc_ifuba.ifu_xtofree); 371 sc->sc_ifuba.ifu_xtofree = 0; 372 } 373 pclstart(unit); 374 } 375 376 /* 377 * PCL interface receiver interrupt. 378 * If input error just drop packet. 379 */ 380 pclrint(unit) 381 int unit; 382 { 383 register struct pcl_softc *sc = &pcl_softc[unit]; 384 struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; 385 struct mbuf *m; 386 int len, plen; short resid; 387 register struct ifqueue *inq; 388 int off; 389 390 sc->sc_if.if_ipackets++; 391 /* 392 * Purge BDP; drop if input error indicated. 393 */ 394 if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) 395 UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); 396 if (addr->pcl_rsr & PCL_ERR) { 397 printf("pcl%d: rcv error, rcr=%b rsr=%b\n", 398 unit, addr->pcl_rcr, PCL_RCSRBITS, 399 addr->pcl_rsr, PCL_RERRBITS); 400 sc->sc_if.if_ierrors++; 401 goto setup; 402 } 403 len = PCLMTU + addr->pcl_rdbc; 404 if (len <= 0 || len > PCLMTU) { 405 printf("pcl%d: bad len=%d.\n", unit, len); 406 sc->sc_if.if_ierrors++; 407 goto setup; 408 } 409 410 /* Really short packets will be part of the startup sequence */ 411 if (len <= 4) { 412 /* Later, do comming-up processing here */ 413 goto setup; /* drop packet */ 414 } 415 416 /* 417 * Pull packet off interface. 418 */ 419 m = if_rubaget(&sc->sc_ifuba, len, 0); 420 if (m == 0) 421 goto setup; 422 423 schednetisr(NETISR_IP); 424 inq = &ipintrq; 425 426 if (IF_QFULL(inq)) { 427 IF_DROP(inq); 428 m_freem(m); 429 } else 430 IF_ENQUEUE(inq, m); 431 setup: 432 /* 433 * Reset for next packet. 434 */ 435 addr->pcl_rcr = PCL_RCINIT; 436 addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; 437 addr->pcl_rdbc = -PCLMTU; 438 addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | 439 PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; 440 } 441 #endif 442