1: /*
   2:  * Copyright (c) 1982, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)if_uba.c	7.1 (Berkeley) 6/5/86
   7:  */
   8: 
   9: #include "../machine/pte.h"
  10: 
  11: #include "param.h"
  12: #include "systm.h"
  13: #include "mbuf.h"
  14: #include "map.h"
  15: #include "buf.h"
  16: #include "cmap.h"
  17: #include "vmmac.h"
  18: #include "socket.h"
  19: #include "syslog.h"
  20: 
  21: #include "../net/if.h"
  22: 
  23: #include "../vax/mtpr.h"
  24: #include "if_uba.h"
  25: #include "../vaxuba/ubareg.h"
  26: #include "../vaxuba/ubavar.h"
  27: 
  28: /*
  29:  * Routines supporting UNIBUS network interfaces.
  30:  *
  31:  * TODO:
  32:  *	Support interfaces using only one BDP statically.
  33:  */
  34: 
  35: /*
  36:  * Init UNIBUS for interface on uban whose headers of size hlen are to
  37:  * end on a page boundary.  We allocate a UNIBUS map register for the page
  38:  * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
  39:  * doing this once for each read and once for each write buffer.  We also
  40:  * allocate page frames in the mbuffer pool for these pages.
  41:  */
  42: if_ubaminit(ifu, uban, hlen, nmr, ifr, nr, ifw, nw)
  43:     register struct ifubinfo *ifu;
  44:     int uban, hlen, nmr, nr, nw;
  45:     register struct ifrw *ifr;
  46:     register struct ifxmt *ifw;
  47: {
  48:     register caddr_t p;
  49:     caddr_t cp;
  50:     int i, ncl, off;
  51: 
  52:     if (hlen)
  53:         off = CLBYTES - hlen;
  54:     else
  55:         off = 0;
  56:     ncl = clrnd(nmr) / CLSIZE;
  57:     if (hlen)
  58:         ncl++;
  59:     if (ifr[0].ifrw_addr)
  60:         cp = ifr[0].ifrw_addr - off;
  61:     else {
  62:         cp = m_clalloc((nr + nw) * ncl, MPG_SPACE, M_DONTWAIT);
  63:         if (cp == 0)
  64:             return (0);
  65:         p = cp;
  66:         for (i = 0; i < nr; i++) {
  67:             ifr[i].ifrw_addr = p + off;
  68:             p += ncl * CLBYTES;
  69:         }
  70:         for (i = 0; i < nw; i++) {
  71:             ifw[i].ifw_base = p;
  72:             ifw[i].ifw_addr = p + off;
  73:             p += ncl * CLBYTES;
  74:         }
  75:         ifu->iff_hlen = hlen;
  76:         ifu->iff_uban = uban;
  77:         ifu->iff_uba = uba_hd[uban].uh_uba;
  78:     }
  79:     for (i = 0; i < nr; i++)
  80:         if (if_ubaalloc(ifu, &ifr[i], nmr) == 0) {
  81:             nr = i;
  82:             nw = 0;
  83:             goto bad;
  84:         }
  85:     for (i = 0; i < nw; i++)
  86:         if (if_ubaalloc(ifu, &ifw[i].ifrw, nmr) == 0) {
  87:             nw = i;
  88:             goto bad;
  89:         }
  90:     while (--nw >= 0) {
  91:         for (i = 0; i < nmr; i++)
  92:             ifw[nw].ifw_wmap[i] = ifw[nw].ifw_mr[i];
  93:         ifw[nw].ifw_xswapd = 0;
  94:         ifw[nw].ifw_flags = IFRW_W;
  95:         ifw[nw].ifw_nmr = nmr;
  96:     }
  97:     return (1);
  98: bad:
  99:     while (--nw >= 0)
 100:         ubarelse(ifu->iff_uban, &ifr[nw].ifrw_info);
 101:     while (--nr >= 0)
 102:         ubarelse(ifu->iff_uban, &ifw[nr].ifw_info);
 103:     m_pgfree(cp, (nr + nw) * ncl);
 104:     ifr[0].ifrw_addr = 0;
 105:     return (0);
 106: }
 107: 
 108: /*
 109:  * Setup an ifrw structure by allocating UNIBUS map registers,
 110:  * possibly a buffered data path, and initializing the fields of
 111:  * the ifrw structure to minimize run-time overhead.
 112:  */
 113: static
 114: if_ubaalloc(ifu, ifrw, nmr)
 115:     struct ifubinfo *ifu;
 116:     register struct ifrw *ifrw;
 117:     int nmr;
 118: {
 119:     register int info;
 120: 
 121:     info =
 122:         uballoc(ifu->iff_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->iff_hlen,
 123:             ifu->iff_flags);
 124:     if (info == 0)
 125:         return (0);
 126:     ifrw->ifrw_info = info;
 127:     ifrw->ifrw_bdp = UBAI_BDP(info);
 128:     ifrw->ifrw_proto = UBAMR_MRV | (UBAI_BDP(info) << UBAMR_DPSHIFT);
 129:     ifrw->ifrw_mr = &ifu->iff_uba->uba_map[UBAI_MR(info) + (ifu->iff_hlen?
 130:         1 : 0)];
 131:     return (1);
 132: }
 133: 
 134: /*
 135:  * Pull read data off a interface.
 136:  * Len is length of data, with local net header stripped.
 137:  * Off is non-zero if a trailer protocol was used, and
 138:  * gives the offset of the trailer information.
 139:  * We copy the trailer information and then all the normal
 140:  * data into mbufs.  When full cluster sized units are present
 141:  * on the interface on cluster boundaries we can get them more
 142:  * easily by remapping, and take advantage of this here.
 143:  * Prepend a pointer to the interface structure,
 144:  * so that protocols can determine where incoming packets arrived.
 145:  * Note: we may be called to receive from a transmit buffer by some
 146:  * devices.  In that case, we must force normal mapping of the buffer,
 147:  * so that the correct data will appear (only unibus maps are
 148:  * changed when remapping the transmit buffers).
 149:  */
 150: struct mbuf *
 151: if_ubaget(ifu, ifr, totlen, off0, ifp)
 152:     struct ifubinfo *ifu;
 153:     register struct ifrw *ifr;
 154:     int totlen, off0;
 155:     struct ifnet *ifp;
 156: {
 157:     struct mbuf *top, **mp;
 158:     register struct mbuf *m;
 159:     int off = off0, len;
 160:     register caddr_t cp = ifr->ifrw_addr + ifu->iff_hlen, pp;
 161: 
 162:     top = 0;
 163:     mp = &top;
 164:     if (ifr->ifrw_flags & IFRW_W)
 165:         rcv_xmtbuf((struct ifxmt *)ifr);
 166:     while (totlen > 0) {
 167:         MGET(m, M_DONTWAIT, MT_DATA);
 168:         if (m == 0) {
 169:             m_freem(top);
 170:             top = 0;
 171:             goto out;
 172:         }
 173:         if (off) {
 174:             len = totlen - off;
 175:             cp = ifr->ifrw_addr + ifu->iff_hlen + off;
 176:         } else
 177:             len = totlen;
 178:         if (len >= CLBYTES/2) {
 179:             struct pte *cpte, *ppte;
 180:             int x, *ip, i;
 181: 
 182:             /*
 183: 			 * If doing the first mbuf and
 184: 			 * the interface pointer hasn't been put in,
 185: 			 * put it in a separate mbuf to preserve alignment.
 186: 			 */
 187:             if (ifp) {
 188:                 len = 0;
 189:                 goto nopage;
 190:             }
 191:             MCLGET(m);
 192:             if (m->m_len != CLBYTES)
 193:                 goto nopage;
 194:             m->m_len = MIN(len, CLBYTES);
 195:             if (!claligned(cp))
 196:                 goto copy;
 197: 
 198:             /*
 199: 			 * Switch pages mapped to UNIBUS with new page pp,
 200: 			 * as quick form of copy.  Remap UNIBUS and invalidate.
 201: 			 */
 202:             pp = mtod(m, char *);
 203:             cpte = &Mbmap[mtocl(cp)*CLSIZE];
 204:             ppte = &Mbmap[mtocl(pp)*CLSIZE];
 205:             x = btop(cp - ifr->ifrw_addr);
 206:             ip = (int *)&ifr->ifrw_mr[x];
 207:             for (i = 0; i < CLSIZE; i++) {
 208:                 struct pte t;
 209:                 t = *ppte; *ppte++ = *cpte; *cpte = t;
 210:                 *ip++ =
 211:                     cpte++->pg_pfnum|ifr->ifrw_proto;
 212:                 mtpr(TBIS, cp);
 213:                 cp += NBPG;
 214:                 mtpr(TBIS, (caddr_t)pp);
 215:                 pp += NBPG;
 216:             }
 217:             goto nocopy;
 218:         }
 219: nopage:
 220:         m->m_off = MMINOFF;
 221:         if (ifp) {
 222:             /*
 223: 			 * Leave room for ifp.
 224: 			 */
 225:             m->m_len = MIN(MLEN - sizeof(ifp), len);
 226:             m->m_off += sizeof(ifp);
 227:         } else
 228:             m->m_len = MIN(MLEN, len);
 229: copy:
 230:         bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
 231:         cp += m->m_len;
 232: nocopy:
 233:         *mp = m;
 234:         mp = &m->m_next;
 235:         if (off) {
 236:             /* sort of an ALGOL-W style for statement... */
 237:             off += m->m_len;
 238:             if (off == totlen) {
 239:                 cp = ifr->ifrw_addr + ifu->iff_hlen;
 240:                 off = 0;
 241:                 totlen = off0;
 242:             }
 243:         } else
 244:             totlen -= m->m_len;
 245:         if (ifp) {
 246:             /*
 247: 			 * Prepend interface pointer to first mbuf.
 248: 			 */
 249:             m->m_len += sizeof(ifp);
 250:             m->m_off -= sizeof(ifp);
 251:             *(mtod(m, struct ifnet **)) = ifp;
 252:             ifp = (struct ifnet *)0;
 253:         }
 254:     }
 255: out:
 256:     if (ifr->ifrw_flags & IFRW_W)
 257:         restor_xmtbuf((struct ifxmt *)ifr);
 258:     return (top);
 259: }
 260: 
 261: /*
 262:  * Change the mapping on a transmit buffer so that if_ubaget may
 263:  * receive from that buffer.  Copy data from any pages mapped to Unibus
 264:  * into the pages mapped to normal kernel virtual memory, so that
 265:  * they can be accessed and swapped as usual.  We take advantage
 266:  * of the fact that clusters are placed on the xtofree list
 267:  * in inverse order, finding the last one.
 268:  */
 269: static
 270: rcv_xmtbuf(ifw)
 271:     register struct ifxmt *ifw;
 272: {
 273:     register struct mbuf *m;
 274:     struct mbuf **mprev;
 275:     register i;
 276:     int t;
 277:     char *cp;
 278: 
 279:     while (i = ffs((long)ifw->ifw_xswapd)) {
 280:         cp = ifw->ifw_base + i * CLBYTES;
 281:         i--;
 282:         ifw->ifw_xswapd &= ~(1<<i);
 283:         i *= CLSIZE;
 284:         mprev = &ifw->ifw_xtofree;
 285:         for (m = ifw->ifw_xtofree; m && m->m_next; m = m->m_next)
 286:             mprev = &m->m_next;
 287:         if (m == NULL)
 288:             panic("rcv_xmtbuf");
 289:         bcopy(mtod(m, caddr_t), cp, CLBYTES);
 290:         (void) m_free(m);
 291:         *mprev = NULL;
 292:         for (t = 0; t < CLSIZE; t++) {
 293:             ifw->ifw_mr[i] = ifw->ifw_wmap[i];
 294:             i++;
 295:         }
 296:     }
 297: }
 298: 
 299: /*
 300:  * Put a transmit buffer back together after doing an if_ubaget on it,
 301:  * which may have swapped pages.
 302:  */
 303: static
 304: restor_xmtbuf(ifw)
 305:     register struct ifxmt *ifw;
 306: {
 307:     register i;
 308: 
 309:     for (i = 0; i < ifw->ifw_nmr; i++)
 310:         ifw->ifw_wmap[i] = ifw->ifw_mr[i];
 311: }
 312: 
 313: /*
 314:  * Map a chain of mbufs onto a network interface
 315:  * in preparation for an i/o operation.
 316:  * The argument chain of mbufs includes the local network
 317:  * header which is copied to be in the mapped, aligned
 318:  * i/o space.
 319:  */
 320: if_ubaput(ifu, ifw, m)
 321:     struct ifubinfo *ifu;
 322:     register struct ifxmt *ifw;
 323:     register struct mbuf *m;
 324: {
 325:     register struct mbuf *mp;
 326:     register caddr_t cp, dp;
 327:     register int i;
 328:     int xswapd = 0;
 329:     int x, cc, t;
 330: 
 331:     cp = ifw->ifw_addr;
 332:     while (m) {
 333:         dp = mtod(m, char *);
 334:         if (claligned(cp) && claligned(dp) &&
 335:             (m->m_len == CLBYTES || m->m_next == (struct mbuf *)0)) {
 336:             struct pte *pte; int *ip;
 337:             pte = &Mbmap[mtocl(dp)*CLSIZE];
 338:             x = btop(cp - ifw->ifw_addr);
 339:             ip = (int *)&ifw->ifw_mr[x];
 340:             for (i = 0; i < CLSIZE; i++)
 341:                 *ip++ =
 342:                     ifw->ifw_proto | pte++->pg_pfnum;
 343:             xswapd |= 1 << (x>>(CLSHIFT-PGSHIFT));
 344:             mp = m->m_next;
 345:             m->m_next = ifw->ifw_xtofree;
 346:             ifw->ifw_xtofree = m;
 347:             cp += m->m_len;
 348:         } else {
 349:             bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
 350:             cp += m->m_len;
 351:             MFREE(m, mp);
 352:         }
 353:         m = mp;
 354:     }
 355: 
 356:     /*
 357: 	 * Xswapd is the set of clusters we just mapped out.  Ifu->iff_xswapd
 358: 	 * is the set of clusters mapped out from before.  We compute
 359: 	 * the number of clusters involved in this operation in x.
 360: 	 * Clusters mapped out before and involved in this operation
 361: 	 * should be unmapped so original pages will be accessed by the device.
 362: 	 */
 363:     cc = cp - ifw->ifw_addr;
 364:     x = ((cc - ifu->iff_hlen) + CLBYTES - 1) >> CLSHIFT;
 365:     ifw->ifw_xswapd &= ~xswapd;
 366:     while (i = ffs((long)ifw->ifw_xswapd)) {
 367:         i--;
 368:         if (i >= x)
 369:             break;
 370:         ifw->ifw_xswapd &= ~(1<<i);
 371:         i *= CLSIZE;
 372:         for (t = 0; t < CLSIZE; t++) {
 373:             ifw->ifw_mr[i] = ifw->ifw_wmap[i];
 374:             i++;
 375:         }
 376:     }
 377:     ifw->ifw_xswapd |= xswapd;
 378:     return (cc);
 379: }

Defined functions

if_ubaalloc defined in line 113; used 2 times
rcv_xmtbuf defined in line 269; used 1 times
restor_xmtbuf defined in line 303; used 1 times
Last modified: 1986-06-06
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