sys/dev/netif/fwe/if_fwe.c

   1 /*
   2  * Copyright (c) 2002-2003
   3  *      Hidetoshi Shimokawa. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *
  16  *      This product includes software developed by Hidetoshi Shimokawa.
  17  *
  18  * 4. Neither the name of the author nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD: src/sys/dev/firewire/if_fwe.c,v 1.27 2004/01/08 14:58:09 simokawa Exp $
  35  * $DragonFly: src/sys/dev/netif/fwe/if_fwe.c,v 1.31 2008/05/14 11:59:20 sephe Exp $
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_polling.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/conf.h>
  43 #include <sys/kernel.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/socket.h>
  47 #include <sys/sockio.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/systm.h>
  50 #include <sys/module.h>
  51 #include <sys/bus.h>
  52 #include <sys/thread2.h>
  53
  54 #include <net/bpf.h>
  55 #include <net/ethernet.h>
  56 #include <net/if.h>
  57 #include <net/if_arp.h>
  58 #ifdef __DragonFly__
  59 #include <net/ifq_var.h>
  60 #include <net/vlan/if_vlan_var.h>
  61 #include <bus/firewire/firewire.h>
  62 #include <bus/firewire/firewirereg.h>
  63 #include "if_fwevar.h"
  64 #else
  65 #include <net/if_vlan_var.h>
  66
  67 #include <dev/firewire/firewire.h>
  68 #include <dev/firewire/firewirereg.h>
  69 #include <dev/firewire/if_fwevar.h>
  70 #endif
  71
  72 #define FWEDEBUG        if (fwedebug) if_printf
  73 #define TX_MAX_QUEUE    (FWMAXQUEUE - 1)
  74
  75 /* network interface */
  76 static void fwe_start (struct ifnet *);
  77 static int fwe_ioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
  78 static void fwe_init (void *);
  79
  80 static void fwe_output_callback (struct fw_xfer *);
  81 static void fwe_as_output (struct fwe_softc *, struct ifnet *);
  82 static void fwe_as_input (struct fw_xferq *);
  83
  84 static int fwedebug = 0;
  85 static int stream_ch = 1;
  86 static int tx_speed = 2;
  87 static int rx_queue_len = FWMAXQUEUE;
  88
  89 MALLOC_DEFINE(M_FWE, "if_fwe", "Ethernet over FireWire interface");
  90 SYSCTL_INT(_debug, OID_AUTO, if_fwe_debug, CTLFLAG_RW, &fwedebug, 0,
  91         "Enable debug output");
  92 SYSCTL_DECL(_hw_firewire);
  93 SYSCTL_NODE(_hw_firewire, OID_AUTO, fwe, CTLFLAG_RD, 0,
  94         "Ethernet emulation subsystem");
  95 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, stream_ch, CTLFLAG_RW, &stream_ch, 0,
  96         "Stream channel to use");
  97 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, tx_speed, CTLFLAG_RW, &tx_speed, 0,
  98         "Transmission speed");
  99 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, rx_queue_len, CTLFLAG_RW, &rx_queue_len,
 100         0, "Length of the receive queue");
 101
 102 TUNABLE_INT("hw.firewire.fwe.stream_ch", &stream_ch);
 103 TUNABLE_INT("hw.firewire.fwe.tx_speed", &tx_speed);
 104 TUNABLE_INT("hw.firewire.fwe.rx_queue_len", &rx_queue_len);
 105
 106 #ifdef DEVICE_POLLING
 107
 108 static void
 109 fwe_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
 110 {
 111         struct fwe_softc *fwe;
 112         struct firewire_comm *fc;
 113
 114         fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 115         fc = fwe->fd.fc;
 116         switch(cmd) {
 117         case POLL_REGISTER:
 118                 /* disable interrupts */
 119                 fc->set_intr(fc, 0);
 120                 break;
 121         case POLL_DEREGISTER:
 122                 /* enable interrupts */
 123                 fc->set_intr(fc, 1);
 124                 break;
 125         default:
 126                 fc->poll(fc, (cmd == POLL_AND_CHECK_STATUS)?0:1, count);
 127                 break;
 128         }
 129 }
 130
 131 #endif
 132
 133 static int
 134 fwe_probe(device_t dev)
 135 {
 136         device_t pa;
 137
 138         pa = device_get_parent(dev);
 139         if(device_get_unit(dev) != device_get_unit(pa)){
 140                 return(ENXIO);
 141         }
 142
 143         device_set_desc(dev, "Ethernet over FireWire");
 144         return (0);
 145 }
 146
 147 static int
 148 fwe_attach(device_t dev)
 149 {
 150         struct fwe_softc *fwe;
 151         struct ifnet *ifp;
 152         uint8_t eaddr[ETHER_ADDR_LEN];
 153         struct fw_eui64 *eui;
 154
 155         fwe = ((struct fwe_softc *)device_get_softc(dev));
 156
 157         /* XXX */
 158         fwe->stream_ch = stream_ch;
 159         fwe->dma_ch = -1;
 160
 161         fwe->fd.fc = device_get_ivars(dev);
 162         if (tx_speed < 0)
 163                 tx_speed = fwe->fd.fc->speed;
 164
 165         fwe->fd.dev = dev;
 166         fwe->fd.post_explore = NULL;
 167         fwe->eth_softc.fwe = fwe;
 168
 169         fwe->pkt_hdr.mode.stream.tcode = FWTCODE_STREAM;
 170         fwe->pkt_hdr.mode.stream.sy = 0;
 171         fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 172
 173         /* generate fake MAC address: first and last 3bytes from eui64 */
 174 #define LOCAL (0x02)
 175 #define GROUP (0x01)
 176
 177         eui = &fwe->fd.fc->eui;
 178         eaddr[0] = (FW_EUI64_BYTE(eui, 0) | LOCAL) & ~GROUP;
 179         eaddr[1] = FW_EUI64_BYTE(eui, 1);
 180         eaddr[2] = FW_EUI64_BYTE(eui, 2);
 181         eaddr[3] = FW_EUI64_BYTE(eui, 5);
 182         eaddr[4] = FW_EUI64_BYTE(eui, 6);
 183         eaddr[5] = FW_EUI64_BYTE(eui, 7);
 184
 185         /* fill the rest and attach interface */
 186         ifp = &fwe->fwe_if;
 187         ifp->if_softc = &fwe->eth_softc;
 188
 189         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 190         ifp->if_init = fwe_init;
 191         ifp->if_start = fwe_start;
 192         ifp->if_ioctl = fwe_ioctl;
 193         ifp->if_capabilities = IFCAP_VLAN_MTU;
 194 #ifdef DEVICE_POLLING
 195         ifp->if_poll = fwe_poll;
 196 #endif
 197         ifp->if_mtu = ETHERMTU;
 198         ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
 199         ifq_set_maxlen(&ifp->if_snd, TX_MAX_QUEUE);
 200         ifq_set_ready(&ifp->if_snd);
 201
 202         ether_ifattach(ifp, eaddr, NULL);
 203
 204         /* Tell the upper layer(s) we support long frames. */
 205         ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
 206
 207
 208         FWEDEBUG(ifp, "interface created\n");
 209         return 0;
 210 }
 211
 212 static void
 213 fwe_stop(struct fwe_softc *fwe)
 214 {
 215         struct firewire_comm *fc;
 216         struct fw_xferq *xferq;
 217         struct ifnet *ifp = &fwe->fwe_if;
 218         struct fw_xfer *xfer, *next;
 219         int i;
 220
 221         fc = fwe->fd.fc;
 222
 223         ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
 224
 225         if (fwe->dma_ch >= 0) {
 226                 xferq = fc->ir[fwe->dma_ch];
 227
 228                 if (xferq->flag & FWXFERQ_RUNNING)
 229                         fc->irx_disable(fc, fwe->dma_ch);
 230                 xferq->flag &=
 231                         ~(FWXFERQ_MODEMASK | FWXFERQ_OPEN | FWXFERQ_STREAM |
 232                         FWXFERQ_EXTBUF | FWXFERQ_HANDLER | FWXFERQ_CHTAGMASK);
 233                 xferq->hand =  NULL;
 234
 235                 for (i = 0; i < xferq->bnchunk; i ++)
 236                         m_freem(xferq->bulkxfer[i].mbuf);
 237                 kfree(xferq->bulkxfer, M_FWE);
 238
 239                 for (xfer = STAILQ_FIRST(&fwe->xferlist); xfer != NULL;
 240                                         xfer = next) {
 241                         next = STAILQ_NEXT(xfer, link);
 242                         fw_xfer_free(xfer);
 243                 }
 244                 STAILQ_INIT(&fwe->xferlist);
 245
 246                 xferq->bulkxfer =  NULL;
 247                 fwe->dma_ch = -1;
 248         }
 249 }
 250
 251 static int
 252 fwe_detach(device_t dev)
 253 {
 254         struct fwe_softc *fwe = device_get_softc(dev);
 255
 256         lwkt_serialize_enter(fwe->fwe_if.if_serializer);
 257         fwe_stop(fwe);
 258         lwkt_serialize_exit(fwe->fwe_if.if_serializer);
 259
 260         ether_ifdetach(&fwe->fwe_if);
 261         return 0;
 262 }
 263
 264 static void
 265 fwe_init(void *arg)
 266 {
 267         struct fwe_softc *fwe = ((struct fwe_eth_softc *)arg)->fwe;
 268         struct firewire_comm *fc;
 269         struct ifnet *ifp = &fwe->fwe_if;
 270         struct fw_xferq *xferq;
 271         struct fw_xfer *xfer;
 272         struct mbuf *m;
 273         int i;
 274
 275         FWEDEBUG(ifp, "initializing\n");
 276
 277         /* XXX keep promiscoud mode */
 278         ifp->if_flags |= IFF_PROMISC;
 279
 280         fc = fwe->fd.fc;
 281 #define START 0
 282         if (fwe->dma_ch < 0) {
 283                 for (i = START; i < fc->nisodma; i ++) {
 284                         xferq = fc->ir[i];
 285                         if ((xferq->flag & FWXFERQ_OPEN) == 0)
 286                                 goto found;
 287                 }
 288                 if_printf(ifp, "no free dma channel\n");
 289                 return;
 290 found:
 291                 fwe->dma_ch = i;
 292                 fwe->stream_ch = stream_ch;
 293                 fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 294                 /* allocate DMA channel and init packet mode */
 295                 xferq->flag |= FWXFERQ_OPEN | FWXFERQ_EXTBUF |
 296                                 FWXFERQ_HANDLER | FWXFERQ_STREAM;
 297                 xferq->flag &= ~0xff;
 298                 xferq->flag |= fwe->stream_ch & 0xff;
 299                 /* register fwe_input handler */
 300                 xferq->sc = (caddr_t) fwe;
 301                 xferq->hand = fwe_as_input;
 302                 xferq->bnchunk = rx_queue_len;
 303                 xferq->bnpacket = 1;
 304                 xferq->psize = MCLBYTES;
 305                 xferq->queued = 0;
 306                 xferq->buf = NULL;
 307                 xferq->bulkxfer = (struct fw_bulkxfer *) kmalloc(
 308                         sizeof(struct fw_bulkxfer) * xferq->bnchunk,
 309                                                         M_FWE, M_WAITOK);
 310                 STAILQ_INIT(&xferq->stvalid);
 311                 STAILQ_INIT(&xferq->stfree);
 312                 STAILQ_INIT(&xferq->stdma);
 313                 xferq->stproc = NULL;
 314                 for (i = 0; i < xferq->bnchunk; i ++) {
 315                         m = m_getcl(MB_WAIT, MT_DATA, M_PKTHDR);
 316                         xferq->bulkxfer[i].mbuf = m;
 317                         if (m != NULL) {
 318                                 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 319                                 STAILQ_INSERT_TAIL(&xferq->stfree,
 320                                                 &xferq->bulkxfer[i], link);
 321                         } else {
 322                                 if_printf(ifp, "fwe_init: m_getcl failed\n");
 323                         }
 324                 }
 325                 STAILQ_INIT(&fwe->xferlist);
 326                 for (i = 0; i < TX_MAX_QUEUE; i++) {
 327                         xfer = fw_xfer_alloc(M_FWE);
 328                         if (xfer == NULL)
 329                                 break;
 330                         xfer->send.spd = tx_speed;
 331                         xfer->fc = fwe->fd.fc;
 332                         xfer->retry_req = fw_asybusy;
 333                         xfer->sc = (caddr_t)fwe;
 334                         xfer->act.hand = fwe_output_callback;
 335                         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 336                 }
 337         } else
 338                 xferq = fc->ir[fwe->dma_ch];
 339
 340 #ifdef DEVICE_POLLING
 341         /* Disable interrupt, if polling(4) is enabled */
 342         if (ifp->if_flags & IFF_POLLING)
 343                 fc->set_intr(fc, 0);
 344         else
 345 #endif
 346         fc->set_intr(fc, 1);
 347
 348         /* start dma */
 349         if ((xferq->flag & FWXFERQ_RUNNING) == 0)
 350                 fc->irx_enable(fc, fwe->dma_ch);
 351
 352         ifp->if_flags |= IFF_RUNNING;
 353         ifp->if_flags &= ~IFF_OACTIVE;
 354 }
 355
 356
 357 static int
 358 fwe_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 359 {
 360         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 361         struct ifstat *ifs = NULL;
 362         int error = 0, len;
 363
 364         switch (cmd) {
 365         case SIOCSIFFLAGS:
 366                 if (ifp->if_flags & IFF_UP) {
 367                         if (!(ifp->if_flags & IFF_RUNNING))
 368                                 fwe_init(&fwe->eth_softc);
 369                 } else {
 370                         if (ifp->if_flags & IFF_RUNNING)
 371                                 fwe_stop(fwe);
 372                 }
 373                 /* XXX keep promiscoud mode */
 374                 ifp->if_flags |= IFF_PROMISC;
 375                 break;
 376         case SIOCADDMULTI:
 377         case SIOCDELMULTI:
 378                 break;
 379
 380         case SIOCGIFSTATUS:
 381                 ifs = (struct ifstat *)data;
 382                 len = strlen(ifs->ascii);
 383                 if (len < sizeof(ifs->ascii))
 384                         ksnprintf(ifs->ascii + len,
 385                                 sizeof(ifs->ascii) - len,
 386                                 "\tch %d dma %d\n",
 387                                         fwe->stream_ch, fwe->dma_ch);
 388                 break;
 389         default:
 390                 error = ether_ioctl(ifp, cmd, data);
 391                 break;
 392         }
 393         return (error);
 394 }
 395
 396 static void
 397 fwe_output_callback(struct fw_xfer *xfer)
 398 {
 399         struct fwe_softc *fwe;
 400         struct ifnet *ifp;
 401
 402         fwe = (struct fwe_softc *)xfer->sc;
 403         ifp = &fwe->fwe_if;
 404         lwkt_serialize_enter(ifp->if_serializer);
 405         /* XXX error check */
 406         FWEDEBUG(ifp, "resp = %d\n", xfer->resp);
 407         if (xfer->resp != 0)
 408                 ifp->if_oerrors ++;
 409
 410         m_freem(xfer->mbuf);
 411         fw_xfer_unload(xfer);
 412
 413         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 414
 415         /* for queue full */
 416         if (!ifq_is_empty(&ifp->if_snd))
 417                 if_devstart(ifp);
 418         lwkt_serialize_exit(ifp->if_serializer);
 419 }
 420
 421 static void
 422 fwe_start(struct ifnet *ifp)
 423 {
 424         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 425
 426         FWEDEBUG(ifp, "starting\n");
 427
 428         if (fwe->dma_ch < 0) {
 429                 FWEDEBUG(ifp, "not ready\n");
 430
 431                 ifq_purge(&ifp->if_snd);
 432         } else {
 433                 ifp->if_flags |= IFF_OACTIVE;
 434
 435                 if (!ifq_is_empty(&ifp->if_snd))
 436                         fwe_as_output(fwe, ifp);
 437
 438                 ifp->if_flags &= ~IFF_OACTIVE;
 439         }
 440 }
 441
 442 #define HDR_LEN 4
 443 #ifndef ETHER_ALIGN
 444 #define ETHER_ALIGN 2
 445 #endif
 446 /* Async. stream output */
 447 static void
 448 fwe_as_output(struct fwe_softc *fwe, struct ifnet *ifp)
 449 {
 450         struct mbuf *m;
 451         struct fw_xfer *xfer;
 452         struct fw_xferq *xferq;
 453         struct fw_pkt *fp;
 454         int i = 0;
 455
 456         xfer = NULL;
 457         xferq = fwe->fd.fc->atq;
 458         while (xferq->queued < xferq->maxq - 1) {
 459                 xfer = STAILQ_FIRST(&fwe->xferlist);
 460                 if (xfer == NULL) {
 461                         if_printf(ifp, "lack of xfer\n");
 462                         return;
 463                 }
 464                 m = ifq_dequeue(&ifp->if_snd, NULL);
 465                 if (m == NULL)
 466                         break;
 467                 STAILQ_REMOVE_HEAD(&fwe->xferlist, link);
 468                 BPF_MTAP(ifp, m);
 469
 470                 /* keep ip packet alignment for alpha */
 471                 M_PREPEND(m, ETHER_ALIGN, MB_DONTWAIT);
 472                 fp = &xfer->send.hdr;
 473                 *(u_int32_t *)&xfer->send.hdr = *(int32_t *)&fwe->pkt_hdr;
 474                 fp->mode.stream.len = m->m_pkthdr.len;
 475                 xfer->mbuf = m;
 476                 xfer->send.pay_len = m->m_pkthdr.len;
 477
 478                 if (fw_asyreq(fwe->fd.fc, -1, xfer) != 0) {
 479                         /* error */
 480                         ifp->if_oerrors ++;
 481                         /* XXX set error code */
 482                         fwe_output_callback(xfer);
 483                 } else {
 484                         ifp->if_opackets ++;
 485                         i++;
 486                 }
 487         }
 488 #if 0
 489         if (i > 1)
 490                 if_printf(ifp, "%d queued\n", i);
 491 #endif
 492         if (i > 0)
 493                 xferq->start(fwe->fd.fc);
 494 }
 495
 496 /* Async. stream output */
 497 static void
 498 fwe_as_input(struct fw_xferq *xferq)
 499 {
 500         struct mbuf *m, *m0;
 501         struct ifnet *ifp;
 502         struct fwe_softc *fwe;
 503         struct fw_bulkxfer *sxfer;
 504         struct fw_pkt *fp;
 505         u_char *c;
 506
 507         fwe = (struct fwe_softc *)xferq->sc;
 508         ifp = &fwe->fwe_if;
 509         lwkt_serialize_enter(ifp->if_serializer);
 510         while ((sxfer = STAILQ_FIRST(&xferq->stvalid)) != NULL) {
 511                 STAILQ_REMOVE_HEAD(&xferq->stvalid, link);
 512                 fp = mtod(sxfer->mbuf, struct fw_pkt *);
 513                 if (fwe->fd.fc->irx_post != NULL)
 514                         fwe->fd.fc->irx_post(fwe->fd.fc, fp->mode.ld);
 515                 m = sxfer->mbuf;
 516
 517                 /* insert new rbuf */
 518                 sxfer->mbuf = m0 = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR);
 519                 if (m0 != NULL) {
 520                         m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
 521                         STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
 522                 } else {
 523                         if_printf(ifp, "fwe_as_input: m_getcl failed\n");
 524                 }
 525
 526                 if (sxfer->resp != 0 || fp->mode.stream.len <
 527                     ETHER_ALIGN + sizeof(struct ether_header)) {
 528                         m_freem(m);
 529                         ifp->if_ierrors ++;
 530                         continue;
 531                 }
 532
 533                 m->m_data += HDR_LEN + ETHER_ALIGN;
 534                 c = mtod(m, char *);
 535                 m->m_len = m->m_pkthdr.len =
 536                                 fp->mode.stream.len - ETHER_ALIGN;
 537                 m->m_pkthdr.rcvif = ifp;
 538 #if 0
 539                 FWEDEBUG(ifp, "%02x %02x %02x %02x %02x %02x\n"
 540                          "%02x %02x %02x %02x %02x %02x\n"
 541                          "%02x %02x %02x %02x\n"
 542                          "%02x %02x %02x %02x\n"
 543                          "%02x %02x %02x %02x\n"
 544                          "%02x %02x %02x %02x\n",
 545                          c[0], c[1], c[2], c[3], c[4], c[5],
 546                          c[6], c[7], c[8], c[9], c[10], c[11],
 547                          c[12], c[13], c[14], c[15],
 548                          c[16], c[17], c[18], c[19],
 549                          c[20], c[21], c[22], c[23],
 550                          c[20], c[21], c[22], c[23]
 551                  );
 552 #endif
 553                 ifp->if_input(ifp, m);
 554                 ifp->if_ipackets ++;
 555         }
 556         if (STAILQ_FIRST(&xferq->stfree) != NULL)
 557                 fwe->fd.fc->irx_enable(fwe->fd.fc, fwe->dma_ch);
 558         lwkt_serialize_exit(ifp->if_serializer);
 559 }
 560
 561
 562 static devclass_t fwe_devclass;
 563
 564 /*
 565  * Because fwe is a static device that always exists under any attached
 566  * firewire device, and not scanned by the firewire device, we need an
 567  * identify function to install the device.
 568  */
 569 static device_method_t fwe_methods[] = {
 570         /* device interface */
 571         DEVMETHOD(device_identify,      bus_generic_identify_sameunit),
 572         DEVMETHOD(device_probe,         fwe_probe),
 573         DEVMETHOD(device_attach,        fwe_attach),
 574         DEVMETHOD(device_detach,        fwe_detach),
 575         { 0, 0 }
 576 };
 577
 578 static driver_t fwe_driver = {
 579         "fwe",
 580         fwe_methods,
 581         sizeof(struct fwe_softc),
 582 };
 583
 584
 585 DECLARE_DUMMY_MODULE(fwe);
 586 DRIVER_MODULE(fwe, firewire, fwe_driver, fwe_devclass, 0, 0);
 587 MODULE_VERSION(fwe, 1);
 588 MODULE_DEPEND(fwe, firewire, 1, 1, 1);