sys/dev/hatm/if_hatm_intr.c

   1 /*-
   2  * Copyright (c) 2001-2003
   3  *      Fraunhofer Institute for Open Communication Systems (FhG Fokus).
   4  *      All rights reserved.
   5  * Author: Hartmut Brandt <harti@freebsd.org>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 /*
  33  * ForeHE driver.
  34  *
  35  * Interrupt handler.
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_natm.h"
  40
  41 #include <sys/types.h>
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/malloc.h>
  45 #include <sys/kernel.h>
  46 #include <sys/bus.h>
  47 #include <sys/errno.h>
  48 #include <sys/conf.h>
  49 #include <sys/module.h>
  50 #include <sys/queue.h>
  51 #include <sys/syslog.h>
  52 #include <sys/condvar.h>
  53 #include <sys/sysctl.h>
  54 #include <vm/uma.h>
  55
  56 #include <sys/sockio.h>
  57 #include <sys/mbuf.h>
  58 #include <sys/socket.h>
  59
  60 #include <net/if.h>
  61 #include <net/if_media.h>
  62 #include <net/if_atm.h>
  63 #include <net/route.h>
  64 #include <netinet/in.h>
  65 #include <netinet/if_atm.h>
  66
  67 #include <machine/bus.h>
  68 #include <machine/resource.h>
  69 #include <sys/bus.h>
  70 #include <sys/rman.h>
  71 #include <dev/pci/pcireg.h>
  72 #include <dev/pci/pcivar.h>
  73
  74 #include <dev/utopia/utopia.h>
  75 #include <dev/hatm/if_hatmconf.h>
  76 #include <dev/hatm/if_hatmreg.h>
  77 #include <dev/hatm/if_hatmvar.h>
  78
  79 CTASSERT(sizeof(struct mbuf_page) == MBUF_ALLOC_SIZE);
  80 CTASSERT(sizeof(struct mbuf0_chunk) == MBUF0_CHUNK);
  81 CTASSERT(sizeof(struct mbuf1_chunk) == MBUF1_CHUNK);
  82 CTASSERT(sizeof(((struct mbuf0_chunk *)NULL)->storage) >= MBUF0_SIZE);
  83 CTASSERT(sizeof(((struct mbuf1_chunk *)NULL)->storage) >= MBUF1_SIZE);
  84 CTASSERT(sizeof(struct tpd) <= HE_TPD_SIZE);
  85
  86 CTASSERT(MBUF0_PER_PAGE <= 256);
  87 CTASSERT(MBUF1_PER_PAGE <= 256);
  88
  89 static void hatm_mbuf_page_alloc(struct hatm_softc *sc, u_int group);
  90
  91 /*
  92  * Free an external mbuf to a list. We use atomic functions so that
  93  * we don't need a mutex for the list.
  94  *
  95  * Note that in general this algorithm is not safe when multiple readers
  96  * and writers are present. To cite from a mail from David Schultz
  97  * <das@freebsd.org>:
  98  *
  99  *      It looks like this is subject to the ABA problem.  For instance,
 100  *      suppose X, Y, and Z are the top things on the freelist and a
 101  *      thread attempts to make an allocation.  You set buf to X and load
 102  *      buf->link (Y) into a register.  Then the thread get preempted, and
 103  *      another thread allocates both X and Y, then frees X.  When the
 104  *      original thread gets the CPU again, X is still on top of the
 105  *      freelist, so the atomic operation succeeds.  However, the atomic
 106  *      op places Y on top of the freelist, even though Y is no longer
 107  *      free.
 108  *
 109  * We are, however sure that we have only one thread that ever allocates
 110  * buffers because the only place we're call from is the interrupt handler.
 111  * Under these circumstances the code looks safe.
 112  */
 113 void
 114 hatm_ext_free(struct mbufx_free **list, struct mbufx_free *buf)
 115 {
 116         for (;;) {
 117                 buf->link = *list;
 118                 if (atomic_cmpset_ptr((uintptr_t *)list, (uintptr_t)buf->link,
 119                     (uintptr_t)buf))
 120                         break;
 121         }
 122 }
 123
 124 static __inline struct mbufx_free *
 125 hatm_ext_alloc(struct hatm_softc *sc, u_int g)
 126 {
 127         struct mbufx_free *buf;
 128
 129         for (;;) {
 130                 if ((buf = sc->mbuf_list[g]) == NULL)
 131                         break;
 132                 if (atomic_cmpset_ptr((uintptr_t *)&sc->mbuf_list[g],
 133                         (uintptr_t)buf, (uintptr_t)buf->link))
 134                         break;
 135         }
 136         if (buf == NULL) {
 137                 hatm_mbuf_page_alloc(sc, g);
 138                 for (;;) {
 139                         if ((buf = sc->mbuf_list[g]) == NULL)
 140                                 break;
 141                         if (atomic_cmpset_ptr((uintptr_t *)&sc->mbuf_list[g],
 142                             (uintptr_t)buf, (uintptr_t)buf->link))
 143                                 break;
 144                 }
 145         }
 146         return (buf);
 147 }
 148
 149 /*
 150  * Either the queue treshold was crossed or a TPD with the INTR bit set
 151  * was transmitted.
 152  */
 153 static void
 154 he_intr_tbrq(struct hatm_softc *sc, struct hetbrq *q, u_int group)
 155 {
 156         uint32_t *tailp = &sc->hsp->group[group].tbrq_tail;
 157         u_int no;
 158
 159         while (q->head != (*tailp >> 2)) {
 160                 no = (q->tbrq[q->head].addr & HE_REGM_TBRQ_ADDR) >>
 161                     HE_REGS_TPD_ADDR;
 162                 hatm_tx_complete(sc, TPD_ADDR(sc, no),
 163                     (q->tbrq[q->head].addr & HE_REGM_TBRQ_FLAGS));
 164
 165                 if (++q->head == q->size)
 166                         q->head = 0;
 167         }
 168         WRITE4(sc, HE_REGO_TBRQ_H(group), q->head << 2);
 169 }
 170
 171 /*
 172  * DMA loader function for external mbuf page.
 173  */
 174 static void
 175 hatm_extbuf_helper(void *arg, bus_dma_segment_t *segs, int nsegs,
 176     int error)
 177 {
 178         if (error) {
 179                 printf("%s: mapping error %d\n", __func__, error);
 180                 return;
 181         }
 182         KASSERT(nsegs == 1,
 183             ("too many segments for DMA: %d", nsegs));
 184         KASSERT(segs[0].ds_addr <= 0xffffffffLU,
 185             ("phys addr too large %lx", (u_long)segs[0].ds_addr));
 186
 187         *(uint32_t *)arg = segs[0].ds_addr;
 188 }
 189
 190 /*
 191  * Allocate a page of external mbuf storage for the small pools.
 192  * Create a DMA map and load it. Put all the chunks onto the right
 193  * free list.
 194  */
 195 static void
 196 hatm_mbuf_page_alloc(struct hatm_softc *sc, u_int group)
 197 {
 198         struct mbuf_page *pg;
 199         int err;
 200         u_int i;
 201
 202         if (sc->mbuf_npages == sc->mbuf_max_pages)
 203                 return;
 204         if ((pg = malloc(MBUF_ALLOC_SIZE, M_DEVBUF, M_NOWAIT)) == NULL)
 205                 return;
 206
 207         err = bus_dmamap_create(sc->mbuf_tag, 0, &pg->hdr.map);
 208         if (err != 0) {
 209                 if_printf(sc->ifp, "%s -- bus_dmamap_create: %d\n",
 210                     __func__, err);
 211                 free(pg, M_DEVBUF);
 212                 return;
 213         }
 214         err = bus_dmamap_load(sc->mbuf_tag, pg->hdr.map, pg, MBUF_ALLOC_SIZE,
 215             hatm_extbuf_helper, &pg->hdr.phys, BUS_DMA_NOWAIT);
 216         if (err != 0) {
 217                 if_printf(sc->ifp, "%s -- mbuf mapping failed %d\n",
 218                     __func__, err);
 219                 bus_dmamap_destroy(sc->mbuf_tag, pg->hdr.map);
 220                 free(pg, M_DEVBUF);
 221                 return;
 222         }
 223
 224         sc->mbuf_pages[sc->mbuf_npages] = pg;
 225
 226         if (group == 0) {
 227                 struct mbuf0_chunk *c;
 228
 229                 pg->hdr.pool = 0;
 230                 pg->hdr.nchunks = MBUF0_PER_PAGE;
 231                 pg->hdr.chunksize = MBUF0_CHUNK;
 232                 pg->hdr.hdroff = sizeof(c->storage);
 233                 c = (struct mbuf0_chunk *)pg;
 234                 for (i = 0; i < MBUF0_PER_PAGE; i++, c++) {
 235                         c->hdr.pageno = sc->mbuf_npages;
 236                         c->hdr.chunkno = i;
 237                         c->hdr.flags = 0;
 238                         hatm_ext_free(&sc->mbuf_list[0],
 239                             (struct mbufx_free *)c);
 240                 }
 241         } else {
 242                 struct mbuf1_chunk *c;
 243
 244                 pg->hdr.pool = 1;
 245                 pg->hdr.nchunks = MBUF1_PER_PAGE;
 246                 pg->hdr.chunksize = MBUF1_CHUNK;
 247                 pg->hdr.hdroff = sizeof(c->storage);
 248                 c = (struct mbuf1_chunk *)pg;
 249                 for (i = 0; i < MBUF1_PER_PAGE; i++, c++) {
 250                         c->hdr.pageno = sc->mbuf_npages;
 251                         c->hdr.chunkno = i;
 252                         c->hdr.flags = 0;
 253                         hatm_ext_free(&sc->mbuf_list[1],
 254                             (struct mbufx_free *)c);
 255                 }
 256         }
 257         sc->mbuf_npages++;
 258 }
 259
 260 /*
 261  * Free an mbuf and put it onto the free list.
 262  */
 263 static void
 264 hatm_mbuf0_free(void *buf, void *args)
 265 {
 266         struct hatm_softc *sc = args;
 267         struct mbuf0_chunk *c = buf;
 268
 269         KASSERT((c->hdr.flags & (MBUF_USED | MBUF_CARD)) == MBUF_USED,
 270             ("freeing unused mbuf %x", c->hdr.flags));
 271         c->hdr.flags &= ~MBUF_USED;
 272         hatm_ext_free(&sc->mbuf_list[0], (struct mbufx_free *)c);
 273 }
 274 static void
 275 hatm_mbuf1_free(void *buf, void *args)
 276 {
 277         struct hatm_softc *sc = args;
 278         struct mbuf1_chunk *c = buf;
 279
 280         KASSERT((c->hdr.flags & (MBUF_USED | MBUF_CARD)) == MBUF_USED,
 281             ("freeing unused mbuf %x", c->hdr.flags));
 282         c->hdr.flags &= ~MBUF_USED;
 283         hatm_ext_free(&sc->mbuf_list[1], (struct mbufx_free *)c);
 284 }
 285
 286 static void
 287 hatm_mbuf_helper(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 288 {
 289         uint32_t *ptr = (uint32_t *)arg;
 290
 291         if (nsegs == 0) {
 292                 printf("%s: error=%d\n", __func__, error);
 293                 return;
 294         }
 295         KASSERT(nsegs == 1, ("too many segments for mbuf: %d", nsegs));
 296         KASSERT(segs[0].ds_addr <= 0xffffffffLU,
 297             ("phys addr too large %lx", (u_long)segs[0].ds_addr));
 298
 299         *ptr = segs[0].ds_addr;
 300 }
 301
 302 /*
 303  * Receive buffer pool interrupt. This means the number of entries in the
 304  * queue has dropped below the threshold. Try to supply new buffers.
 305  */
 306 static void
 307 he_intr_rbp(struct hatm_softc *sc, struct herbp *rbp, u_int large,
 308     u_int group)
 309 {
 310         u_int ntail;
 311         struct mbuf *m;
 312         int error;
 313         struct mbufx_free *cf;
 314         struct mbuf_page *pg;
 315         struct mbuf0_chunk *buf0;
 316         struct mbuf1_chunk *buf1;
 317
 318         DBG(sc, INTR, ("%s buffer supply threshold crossed for group %u",
 319            large ? "large" : "small", group));
 320
 321         rbp->head = (READ4(sc, HE_REGO_RBP_S(large, group)) >> HE_REGS_RBP_HEAD)
 322             & (rbp->size - 1);
 323
 324         for (;;) {
 325                 if ((ntail = rbp->tail + 1) == rbp->size)
 326                         ntail = 0;
 327                 if (ntail == rbp->head)
 328                         break;
 329                 m = NULL;
 330
 331                 if (large) {
 332                         /* allocate the MBUF */
 333                         if ((m = m_getcl(M_NOWAIT, MT_DATA,
 334                             M_PKTHDR)) == NULL) {
 335                                 if_printf(sc->ifp,
 336                                     "no mbuf clusters\n");
 337                                 break;
 338                         }
 339                         m->m_data += MBUFL_OFFSET;
 340
 341                         if (sc->lbufs[sc->lbufs_next] != NULL)
 342                                 panic("hatm: lbufs full %u", sc->lbufs_next);
 343                         sc->lbufs[sc->lbufs_next] = m;
 344
 345                         if ((error = bus_dmamap_load(sc->mbuf_tag,
 346                             sc->rmaps[sc->lbufs_next],
 347                             m->m_data, rbp->bsize, hatm_mbuf_helper,
 348                             &rbp->rbp[rbp->tail].phys, BUS_DMA_NOWAIT)) != 0)
 349                                 panic("hatm: mbuf mapping failed %d", error);
 350
 351                         bus_dmamap_sync(sc->mbuf_tag,
 352                             sc->rmaps[sc->lbufs_next],
 353                             BUS_DMASYNC_PREREAD);
 354
 355                         rbp->rbp[rbp->tail].handle =
 356                             MBUF_MAKE_LHANDLE(sc->lbufs_next);
 357
 358                         if (++sc->lbufs_next == sc->lbufs_size)
 359                                 sc->lbufs_next = 0;
 360
 361                 } else if (group == 0) {
 362                         /*
 363                          * Allocate small buffer in group 0
 364                          */
 365                         if ((cf = hatm_ext_alloc(sc, 0)) == NULL)
 366                                 break;
 367                         buf0 = (struct mbuf0_chunk *)cf;
 368                         pg = sc->mbuf_pages[buf0->hdr.pageno];
 369                         buf0->hdr.flags |= MBUF_CARD;
 370                         rbp->rbp[rbp->tail].phys = pg->hdr.phys +
 371                             buf0->hdr.chunkno * MBUF0_CHUNK + MBUF0_OFFSET;
 372                         rbp->rbp[rbp->tail].handle =
 373                             MBUF_MAKE_HANDLE(buf0->hdr.pageno,
 374                             buf0->hdr.chunkno);
 375
 376                         bus_dmamap_sync(sc->mbuf_tag, pg->hdr.map,
 377                             BUS_DMASYNC_PREREAD);
 378
 379                 } else if (group == 1) {
 380                         /*
 381                          * Allocate small buffer in group 1
 382                          */
 383                         if ((cf = hatm_ext_alloc(sc, 1)) == NULL)
 384                                 break;
 385                         buf1 = (struct mbuf1_chunk *)cf;
 386                         pg = sc->mbuf_pages[buf1->hdr.pageno];
 387                         buf1->hdr.flags |= MBUF_CARD;
 388                         rbp->rbp[rbp->tail].phys = pg->hdr.phys +
 389                             buf1->hdr.chunkno * MBUF1_CHUNK + MBUF1_OFFSET;
 390                         rbp->rbp[rbp->tail].handle =
 391                             MBUF_MAKE_HANDLE(buf1->hdr.pageno,
 392                             buf1->hdr.chunkno);
 393
 394                         bus_dmamap_sync(sc->mbuf_tag, pg->hdr.map,
 395                             BUS_DMASYNC_PREREAD);
 396
 397                 } else
 398                         /* ups */
 399                         break;
 400
 401                 DBG(sc, DMA, ("MBUF loaded: handle=%x m=%p phys=%x",
 402                     rbp->rbp[rbp->tail].handle, m, rbp->rbp[rbp->tail].phys));
 403
 404                 rbp->tail = ntail;
 405         }
 406         WRITE4(sc, HE_REGO_RBP_T(large, group),
 407             (rbp->tail << HE_REGS_RBP_TAIL));
 408 }
 409
 410 /*
 411  * Extract the buffer and hand it to the receive routine
 412  */
 413 static struct mbuf *
 414 hatm_rx_buffer(struct hatm_softc *sc, u_int group, u_int handle)
 415 {
 416         u_int pageno;
 417         u_int chunkno;
 418         struct mbuf *m;
 419
 420         if (handle & MBUF_LARGE_FLAG) {
 421                 /* large buffer - sync and unload */
 422                 MBUF_PARSE_LHANDLE(handle, handle);
 423                 DBG(sc, RX, ("RX large handle=%x", handle));
 424
 425                 bus_dmamap_sync(sc->mbuf_tag, sc->rmaps[handle],
 426                     BUS_DMASYNC_POSTREAD);
 427                 bus_dmamap_unload(sc->mbuf_tag, sc->rmaps[handle]);
 428
 429                 m = sc->lbufs[handle];
 430                 sc->lbufs[handle] = NULL;
 431
 432                 return (m);
 433         }
 434
 435         MBUF_PARSE_HANDLE(handle, pageno, chunkno);
 436
 437         DBG(sc, RX, ("RX group=%u handle=%x page=%u chunk=%u", group, handle,
 438             pageno, chunkno));
 439
 440         MGETHDR(m, M_NOWAIT, MT_DATA);
 441
 442         if (group == 0) {
 443                 struct mbuf0_chunk *c0;
 444
 445                 c0 = (struct mbuf0_chunk *)sc->mbuf_pages[pageno] + chunkno;
 446                 KASSERT(c0->hdr.pageno == pageno, ("pageno = %u/%u",
 447                     c0->hdr.pageno, pageno));
 448                 KASSERT(c0->hdr.chunkno == chunkno, ("chunkno = %u/%u",
 449                     c0->hdr.chunkno, chunkno));
 450                 KASSERT(c0->hdr.flags & MBUF_CARD, ("mbuf not on card %u/%u",
 451                     pageno, chunkno));
 452                 KASSERT(!(c0->hdr.flags & MBUF_USED), ("used mbuf %u/%u",
 453                     pageno, chunkno));
 454
 455                 c0->hdr.flags |= MBUF_USED;
 456                 c0->hdr.flags &= ~MBUF_CARD;
 457
 458                 if (m != NULL) {
 459                         m->m_ext.ref_cnt = &c0->hdr.ref_cnt;
 460                         MEXTADD(m, (void *)c0, MBUF0_SIZE,
 461                             hatm_mbuf0_free, c0, sc, M_PKTHDR, EXT_EXTREF);
 462                         m->m_data += MBUF0_OFFSET;
 463                 } else
 464                         hatm_mbuf0_free(c0, sc);
 465
 466         } else {
 467                 struct mbuf1_chunk *c1;
 468
 469                 c1 = (struct mbuf1_chunk *)sc->mbuf_pages[pageno] + chunkno;
 470                 KASSERT(c1->hdr.pageno == pageno, ("pageno = %u/%u",
 471                     c1->hdr.pageno, pageno));
 472                 KASSERT(c1->hdr.chunkno == chunkno, ("chunkno = %u/%u",
 473                     c1->hdr.chunkno, chunkno));
 474                 KASSERT(c1->hdr.flags & MBUF_CARD, ("mbuf not on card %u/%u",
 475                     pageno, chunkno));
 476                 KASSERT(!(c1->hdr.flags & MBUF_USED), ("used mbuf %u/%u",
 477                     pageno, chunkno));
 478
 479                 c1->hdr.flags |= MBUF_USED;
 480                 c1->hdr.flags &= ~MBUF_CARD;
 481
 482                 if (m != NULL) {
 483                         m->m_ext.ref_cnt = &c1->hdr.ref_cnt;
 484                         MEXTADD(m, (void *)c1, MBUF1_SIZE,
 485                             hatm_mbuf1_free, c1, sc, M_PKTHDR, EXT_EXTREF);
 486                         m->m_data += MBUF1_OFFSET;
 487                 } else
 488                         hatm_mbuf1_free(c1, sc);
 489         }
 490
 491         return (m);
 492 }
 493
 494 /*
 495  * Interrupt because of receive buffer returned.
 496  */
 497 static void
 498 he_intr_rbrq(struct hatm_softc *sc, struct herbrq *rq, u_int group)
 499 {
 500         struct he_rbrqen *e;
 501         uint32_t flags, tail;
 502         u_int cid, len;
 503         struct mbuf *m;
 504
 505         for (;;) {
 506                 tail = sc->hsp->group[group].rbrq_tail >> 3;
 507
 508                 if (rq->head == tail)
 509                         break;
 510
 511                 e = &rq->rbrq[rq->head];
 512
 513                 flags = e->addr & HE_REGM_RBRQ_FLAGS;
 514                 if (!(flags & HE_REGM_RBRQ_HBUF_ERROR))
 515                         m = hatm_rx_buffer(sc, group, e->addr);
 516                 else
 517                         m = NULL;
 518
 519                 cid = (e->len & HE_REGM_RBRQ_CID) >> HE_REGS_RBRQ_CID;
 520                 len = 4 * (e->len & HE_REGM_RBRQ_LEN);
 521
 522                 hatm_rx(sc, cid, flags, m, len);
 523
 524                 if (++rq->head == rq->size)
 525                         rq->head = 0;
 526         }
 527         WRITE4(sc, HE_REGO_RBRQ_H(group), rq->head << 3);
 528 }
 529
 530 void
 531 hatm_intr(void *p)
 532 {
 533         struct heirq *q = p;
 534         struct hatm_softc *sc = q->sc;
 535         u_int status;
 536         u_int tail;
 537
 538         /* if we have a stray interrupt with a non-initialized card,
 539          * we cannot even lock before looking at the flag */
 540         if (!(sc->ifp->if_drv_flags & IFF_DRV_RUNNING))
 541                 return;
 542
 543         mtx_lock(&sc->mtx);
 544         (void)READ4(sc, HE_REGO_INT_FIFO);
 545
 546         tail = *q->tailp;
 547         if (q->head == tail) {
 548                 /* workaround for tail pointer not updated bug (8.1.1) */
 549                 DBG(sc, INTR, ("hatm: intr tailq not updated bug triggered"));
 550
 551                 /* read the tail pointer from the card */
 552                 tail = READ4(sc, HE_REGO_IRQ_BASE(q->group)) &
 553                     HE_REGM_IRQ_BASE_TAIL;
 554                 BARRIER_R(sc);
 555
 556                 sc->istats.bug_no_irq_upd++;
 557         }
 558
 559         /* clear the interrupt */
 560         WRITE4(sc, HE_REGO_INT_FIFO, HE_REGM_INT_FIFO_CLRA);
 561         BARRIER_W(sc);
 562
 563         while (q->head != tail) {
 564                 status = q->irq[q->head];
 565                 q->irq[q->head] = HE_REGM_ITYPE_INVALID;
 566                 if (++q->head == (q->size - 1))
 567                         q->head = 0;
 568
 569                 switch (status & HE_REGM_ITYPE) {
 570
 571                   case HE_REGM_ITYPE_TBRQ:
 572                         DBG(sc, INTR, ("TBRQ treshold %u", status & HE_REGM_IGROUP));
 573                         sc->istats.itype_tbrq++;
 574                         he_intr_tbrq(sc, &sc->tbrq, status & HE_REGM_IGROUP);
 575                         break;
 576
 577                   case HE_REGM_ITYPE_TPD:
 578                         DBG(sc, INTR, ("TPD ready %u", status & HE_REGM_IGROUP));
 579                         sc->istats.itype_tpd++;
 580                         he_intr_tbrq(sc, &sc->tbrq, status & HE_REGM_IGROUP);
 581                         break;
 582
 583                   case HE_REGM_ITYPE_RBPS:
 584                         sc->istats.itype_rbps++;
 585                         switch (status & HE_REGM_IGROUP) {
 586
 587                           case 0:
 588                                 he_intr_rbp(sc, &sc->rbp_s0, 0, 0);
 589                                 break;
 590
 591                           case 1:
 592                                 he_intr_rbp(sc, &sc->rbp_s1, 0, 1);
 593                                 break;
 594
 595                           default:
 596                                 if_printf(sc->ifp, "bad INTR RBPS%u\n",
 597                                     status & HE_REGM_IGROUP);
 598                                 break;
 599                         }
 600                         break;
 601
 602                   case HE_REGM_ITYPE_RBPL:
 603                         sc->istats.itype_rbpl++;
 604                         switch (status & HE_REGM_IGROUP) {
 605
 606                           case 0:
 607                                 he_intr_rbp(sc, &sc->rbp_l0, 1, 0);
 608                                 break;
 609
 610                           default:
 611                                 if_printf(sc->ifp, "bad INTR RBPL%u\n",
 612                                     status & HE_REGM_IGROUP);
 613                                 break;
 614                         }
 615                         break;
 616
 617                   case HE_REGM_ITYPE_RBRQ:
 618                         DBG(sc, INTR, ("INTERRUPT RBRQ %u", status & HE_REGM_IGROUP));
 619                         sc->istats.itype_rbrq++;
 620                         switch (status & HE_REGM_IGROUP) {
 621
 622                           case 0:
 623                                 he_intr_rbrq(sc, &sc->rbrq_0, 0);
 624                                 break;
 625
 626                           case 1:
 627                                 if (sc->rbrq_1.size > 0) {
 628                                         he_intr_rbrq(sc, &sc->rbrq_1, 1);
 629                                         break;
 630                                 }
 631                                 /* FALLTHRU */
 632
 633                           default:
 634                                 if_printf(sc->ifp, "bad INTR RBRQ%u\n",
 635                                     status & HE_REGM_IGROUP);
 636                                 break;
 637                         }
 638                         break;
 639
 640                   case HE_REGM_ITYPE_RBRQT:
 641                         DBG(sc, INTR, ("INTERRUPT RBRQT %u", status & HE_REGM_IGROUP));
 642                         sc->istats.itype_rbrqt++;
 643                         switch (status & HE_REGM_IGROUP) {
 644
 645                           case 0:
 646                                 he_intr_rbrq(sc, &sc->rbrq_0, 0);
 647                                 break;
 648
 649                           case 1:
 650                                 if (sc->rbrq_1.size > 0) {
 651                                         he_intr_rbrq(sc, &sc->rbrq_1, 1);
 652                                         break;
 653                                 }
 654                                 /* FALLTHRU */
 655
 656                           default:
 657                                 if_printf(sc->ifp, "bad INTR RBRQT%u\n",
 658                                     status & HE_REGM_IGROUP);
 659                                 break;
 660                         }
 661                         break;
 662
 663                   case HE_REGM_ITYPE_PHYS:
 664                         sc->istats.itype_phys++;
 665                         utopia_intr(&sc->utopia);
 666                         break;
 667
 668 #if HE_REGM_ITYPE_UNKNOWN != HE_REGM_ITYPE_INVALID
 669                   case HE_REGM_ITYPE_UNKNOWN:
 670                         sc->istats.itype_unknown++;
 671                         if_printf(sc->ifp, "bad interrupt\n");
 672                         break;
 673 #endif
 674
 675                   case HE_REGM_ITYPE_ERR:
 676                         sc->istats.itype_err++;
 677                         switch (status) {
 678
 679                           case HE_REGM_ITYPE_PERR:
 680                                 if_printf(sc->ifp, "parity error\n");
 681                                 break;
 682
 683                           case HE_REGM_ITYPE_ABORT:
 684                                 if_printf(sc->ifp, "abort interrupt "
 685                                     "addr=0x%08x\n",
 686                                     READ4(sc, HE_REGO_ABORT_ADDR));
 687                                 break;
 688
 689                           default:
 690                                 if_printf(sc->ifp,
 691                                     "bad interrupt type %08x\n", status);
 692                                 break;
 693                         }
 694                         break;
 695
 696                   case HE_REGM_ITYPE_INVALID:
 697                         /* this is the documented fix for the ISW bug 8.1.1
 698                          * Note, that the documented fix is partly wrong:
 699                          * the ISWs should be intialized to 0xf8 not 0xff */
 700                         sc->istats.bug_bad_isw++;
 701                         DBG(sc, INTR, ("hatm: invalid ISW bug triggered"));
 702                         he_intr_tbrq(sc, &sc->tbrq, 0);
 703                         he_intr_rbp(sc, &sc->rbp_s0, 0, 0);
 704                         he_intr_rbp(sc, &sc->rbp_l0, 1, 0);
 705                         he_intr_rbp(sc, &sc->rbp_s1, 0, 1);
 706                         he_intr_rbrq(sc, &sc->rbrq_0, 0);
 707                         he_intr_rbrq(sc, &sc->rbrq_1, 1);
 708                         utopia_intr(&sc->utopia);
 709                         break;
 710
 711                   default:
 712                         if_printf(sc->ifp, "bad interrupt type %08x\n",
 713                             status);
 714                         break;
 715                 }
 716         }
 717
 718         /* write back head to clear queue */
 719         WRITE4(sc, HE_REGO_IRQ_HEAD(0),
 720             ((q->size - 1) << HE_REGS_IRQ_HEAD_SIZE) |
 721             (q->thresh << HE_REGS_IRQ_HEAD_THRESH) |
 722             (q->head << HE_REGS_IRQ_HEAD_HEAD));
 723         BARRIER_W(sc);
 724
 725         /* workaround the back-to-back irq access problem (8.1.2) */
 726         (void)READ4(sc, HE_REGO_INT_FIFO);
 727         BARRIER_R(sc);
 728
 729         mtx_unlock(&sc->mtx);
 730 }