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 1.29 2007/09/09 09:14:38 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 SYSCTL_DECL(_hw_firewire);
  92 SYSCTL_NODE(_hw_firewire, OID_AUTO, fwe, CTLFLAG_RD, 0,
  93         "Ethernet emulation subsystem");
  94 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, stream_ch, CTLFLAG_RW, &stream_ch, 0,
  95         "Stream channel to use");
  96 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, tx_speed, CTLFLAG_RW, &tx_speed, 0,
  97         "Transmission speed");
  98 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, rx_queue_len, CTLFLAG_RW, &rx_queue_len,
  99         0, "Length of the receive queue");
 100
 101 TUNABLE_INT("hw.firewire.fwe.stream_ch", &stream_ch);
 102 TUNABLE_INT("hw.firewire.fwe.tx_speed", &tx_speed);
 103 TUNABLE_INT("hw.firewire.fwe.rx_queue_len", &rx_queue_len);
 104
 105 #ifdef DEVICE_POLLING
 106
 107 static void
 108 fwe_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
 109 {
 110         struct fwe_softc *fwe;
 111         struct firewire_comm *fc;
 112
 113         fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 114         fc = fwe->fd.fc;
 115         switch(cmd) {
 116         case POLL_REGISTER:
 117                 /* disable interrupts */
 118                 fc->set_intr(fc, 0);
 119                 break;
 120         case POLL_DEREGISTER:
 121                 /* enable interrupts */
 122                 fc->set_intr(fc, 1);
 123                 break;
 124         default:
 125                 fc->poll(fc, (cmd == POLL_AND_CHECK_STATUS)?0:1, count);
 126                 break;
 127         }
 128 }
 129
 130 #endif
 131
 132 static int
 133 fwe_probe(device_t dev)
 134 {
 135         device_t pa;
 136
 137         pa = device_get_parent(dev);
 138         if(device_get_unit(dev) != device_get_unit(pa)){
 139                 return(ENXIO);
 140         }
 141
 142         device_set_desc(dev, "Ethernet over FireWire");
 143         return (0);
 144 }
 145
 146 static int
 147 fwe_attach(device_t dev)
 148 {
 149         struct fwe_softc *fwe;
 150         struct ifnet *ifp;
 151         uint8_t eaddr[ETHER_ADDR_LEN];
 152         struct fw_eui64 *eui;
 153
 154         fwe = ((struct fwe_softc *)device_get_softc(dev));
 155
 156         /* XXX */
 157         fwe->stream_ch = stream_ch;
 158         fwe->dma_ch = -1;
 159
 160         fwe->fd.fc = device_get_ivars(dev);
 161         if (tx_speed < 0)
 162                 tx_speed = fwe->fd.fc->speed;
 163
 164         fwe->fd.dev = dev;
 165         fwe->fd.post_explore = NULL;
 166         fwe->eth_softc.fwe = fwe;
 167
 168         fwe->pkt_hdr.mode.stream.tcode = FWTCODE_STREAM;
 169         fwe->pkt_hdr.mode.stream.sy = 0;
 170         fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 171
 172         /* generate fake MAC address: first and last 3bytes from eui64 */
 173 #define LOCAL (0x02)
 174 #define GROUP (0x01)
 175
 176         eui = &fwe->fd.fc->eui;
 177         eaddr[0] = (FW_EUI64_BYTE(eui, 0) | LOCAL) & ~GROUP;
 178         eaddr[1] = FW_EUI64_BYTE(eui, 1);
 179         eaddr[2] = FW_EUI64_BYTE(eui, 2);
 180         eaddr[3] = FW_EUI64_BYTE(eui, 5);
 181         eaddr[4] = FW_EUI64_BYTE(eui, 6);
 182         eaddr[5] = FW_EUI64_BYTE(eui, 7);
 183
 184         /* fill the rest and attach interface */
 185         ifp = &fwe->fwe_if;
 186         ifp->if_softc = &fwe->eth_softc;
 187
 188         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 189         ifp->if_init = fwe_init;
 190         ifp->if_start = fwe_start;
 191         ifp->if_ioctl = fwe_ioctl;
 192         ifp->if_capabilities = IFCAP_VLAN_MTU;
 193 #ifdef DEVICE_POLLING
 194         ifp->if_poll = fwe_poll;
 195 #endif
 196         ifp->if_mtu = ETHERMTU;
 197         ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
 198         ifq_set_maxlen(&ifp->if_snd, TX_MAX_QUEUE);
 199         ifq_set_ready(&ifp->if_snd);
 200
 201         ether_ifattach(ifp, eaddr, NULL);
 202
 203         /* Tell the upper layer(s) we support long frames. */
 204         ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
 205
 206
 207         FWEDEBUG(ifp, "interface created\n");
 208         return 0;
 209 }
 210
 211 static void
 212 fwe_stop(struct fwe_softc *fwe)
 213 {
 214         struct firewire_comm *fc;
 215         struct fw_xferq *xferq;
 216         struct ifnet *ifp = &fwe->fwe_if;
 217         struct fw_xfer *xfer, *next;
 218         int i;
 219
 220         fc = fwe->fd.fc;
 221
 222         ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
 223
 224         if (fwe->dma_ch >= 0) {
 225                 xferq = fc->ir[fwe->dma_ch];
 226
 227                 if (xferq->flag & FWXFERQ_RUNNING)
 228                         fc->irx_disable(fc, fwe->dma_ch);
 229                 xferq->flag &=
 230                         ~(FWXFERQ_MODEMASK | FWXFERQ_OPEN | FWXFERQ_STREAM |
 231                         FWXFERQ_EXTBUF | FWXFERQ_HANDLER | FWXFERQ_CHTAGMASK);
 232                 xferq->hand =  NULL;
 233
 234                 for (i = 0; i < xferq->bnchunk; i ++)
 235                         m_freem(xferq->bulkxfer[i].mbuf);
 236                 kfree(xferq->bulkxfer, M_FWE);
 237
 238                 for (xfer = STAILQ_FIRST(&fwe->xferlist); xfer != NULL;
 239                                         xfer = next) {
 240                         next = STAILQ_NEXT(xfer, link);
 241                         fw_xfer_free(xfer);
 242                 }
 243                 STAILQ_INIT(&fwe->xferlist);
 244
 245                 xferq->bulkxfer =  NULL;
 246                 fwe->dma_ch = -1;
 247         }
 248 }
 249
 250 static int
 251 fwe_detach(device_t dev)
 252 {
 253         struct fwe_softc *fwe = device_get_softc(dev);
 254
 255         lwkt_serialize_enter(fwe->fwe_if.if_serializer);
 256         fwe_stop(fwe);
 257         lwkt_serialize_exit(fwe->fwe_if.if_serializer);
 258
 259         ether_ifdetach(&fwe->fwe_if);
 260         return 0;
 261 }
 262
 263 static void
 264 fwe_init(void *arg)
 265 {
 266         struct fwe_softc *fwe = ((struct fwe_eth_softc *)arg)->fwe;
 267         struct firewire_comm *fc;
 268         struct ifnet *ifp = &fwe->fwe_if;
 269         struct fw_xferq *xferq;
 270         struct fw_xfer *xfer;
 271         struct mbuf *m;
 272         int i;
 273
 274         FWEDEBUG(ifp, "initializing\n");
 275
 276         /* XXX keep promiscoud mode */
 277         ifp->if_flags |= IFF_PROMISC;
 278
 279         fc = fwe->fd.fc;
 280 #define START 0
 281         if (fwe->dma_ch < 0) {
 282                 for (i = START; i < fc->nisodma; i ++) {
 283                         xferq = fc->ir[i];
 284                         if ((xferq->flag & FWXFERQ_OPEN) == 0)
 285                                 goto found;
 286                 }
 287                 if_printf(ifp, "no free dma channel\n");
 288                 return;
 289 found:
 290                 fwe->dma_ch = i;
 291                 fwe->stream_ch = stream_ch;
 292                 fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 293                 /* allocate DMA channel and init packet mode */
 294                 xferq->flag |= FWXFERQ_OPEN | FWXFERQ_EXTBUF |
 295                                 FWXFERQ_HANDLER | FWXFERQ_STREAM;
 296                 xferq->flag &= ~0xff;
 297                 xferq->flag |= fwe->stream_ch & 0xff;
 298                 /* register fwe_input handler */
 299                 xferq->sc = (caddr_t) fwe;
 300                 xferq->hand = fwe_as_input;
 301                 xferq->bnchunk = rx_queue_len;
 302                 xferq->bnpacket = 1;
 303                 xferq->psize = MCLBYTES;
 304                 xferq->queued = 0;
 305                 xferq->buf = NULL;
 306                 xferq->bulkxfer = (struct fw_bulkxfer *) kmalloc(
 307                         sizeof(struct fw_bulkxfer) * xferq->bnchunk,
 308                                                         M_FWE, M_WAITOK);
 309                 if (xferq->bulkxfer == NULL) {
 310                         if_printf(ifp, "malloc failed\n");
 311                         return;
 312                 }
 313                 STAILQ_INIT(&xferq->stvalid);
 314                 STAILQ_INIT(&xferq->stfree);
 315                 STAILQ_INIT(&xferq->stdma);
 316                 xferq->stproc = NULL;
 317                 for (i = 0; i < xferq->bnchunk; i ++) {
 318                         m = m_getcl(MB_WAIT, MT_DATA, M_PKTHDR);
 319                         xferq->bulkxfer[i].mbuf = m;
 320                         if (m != NULL) {
 321                                 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 322                                 STAILQ_INSERT_TAIL(&xferq->stfree,
 323                                                 &xferq->bulkxfer[i], link);
 324                         } else {
 325                                 if_printf(ifp, "fwe_init: m_getcl failed\n");
 326                         }
 327                 }
 328                 STAILQ_INIT(&fwe->xferlist);
 329                 for (i = 0; i < TX_MAX_QUEUE; i++) {
 330                         xfer = fw_xfer_alloc(M_FWE);
 331                         if (xfer == NULL)
 332                                 break;
 333                         xfer->send.spd = tx_speed;
 334                         xfer->fc = fwe->fd.fc;
 335                         xfer->retry_req = fw_asybusy;
 336                         xfer->sc = (caddr_t)fwe;
 337                         xfer->act.hand = fwe_output_callback;
 338                         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 339                 }
 340         } else
 341                 xferq = fc->ir[fwe->dma_ch];
 342
 343 #ifdef DEVICE_POLLING
 344         /* Disable interrupt, if polling(4) is enabled */
 345         if (ifp->if_flags & IFF_POLLING)
 346                 fc->set_intr(fc, 0);
 347         else
 348 #endif
 349         fc->set_intr(fc, 1);
 350
 351         /* start dma */
 352         if ((xferq->flag & FWXFERQ_RUNNING) == 0)
 353                 fc->irx_enable(fc, fwe->dma_ch);
 354
 355         ifp->if_flags |= IFF_RUNNING;
 356         ifp->if_flags &= ~IFF_OACTIVE;
 357 }
 358
 359
 360 static int
 361 fwe_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 362 {
 363         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 364         struct ifstat *ifs = NULL;
 365         int error = 0, len;
 366
 367         switch (cmd) {
 368         case SIOCSIFFLAGS:
 369                 if (ifp->if_flags & IFF_UP) {
 370                         if (!(ifp->if_flags & IFF_RUNNING))
 371                                 fwe_init(&fwe->eth_softc);
 372                 } else {
 373                         if (ifp->if_flags & IFF_RUNNING)
 374                                 fwe_stop(fwe);
 375                 }
 376                 /* XXX keep promiscoud mode */
 377                 ifp->if_flags |= IFF_PROMISC;
 378                 break;
 379         case SIOCADDMULTI:
 380         case SIOCDELMULTI:
 381                 break;
 382
 383         case SIOCGIFSTATUS:
 384                 ifs = (struct ifstat *)data;
 385                 len = strlen(ifs->ascii);
 386                 if (len < sizeof(ifs->ascii))
 387                         ksnprintf(ifs->ascii + len,
 388                                 sizeof(ifs->ascii) - len,
 389                                 "\tch %d dma %d\n",
 390                                         fwe->stream_ch, fwe->dma_ch);
 391                 break;
 392         default:
 393                 error = ether_ioctl(ifp, cmd, data);
 394                 break;
 395         }
 396         return (error);
 397 }
 398
 399 static void
 400 fwe_output_callback(struct fw_xfer *xfer)
 401 {
 402         struct fwe_softc *fwe;
 403         struct ifnet *ifp;
 404
 405         fwe = (struct fwe_softc *)xfer->sc;
 406         ifp = &fwe->fwe_if;
 407         lwkt_serialize_enter(ifp->if_serializer);
 408         /* XXX error check */
 409         FWEDEBUG(ifp, "resp = %d\n", xfer->resp);
 410         if (xfer->resp != 0)
 411                 ifp->if_oerrors ++;
 412
 413         m_freem(xfer->mbuf);
 414         fw_xfer_unload(xfer);
 415
 416         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 417
 418         /* for queue full */
 419         if (!ifq_is_empty(&ifp->if_snd))
 420                 fwe_start(ifp);
 421         lwkt_serialize_exit(ifp->if_serializer);
 422 }
 423
 424 static void
 425 fwe_start(struct ifnet *ifp)
 426 {
 427         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 428
 429         FWEDEBUG(ifp, "starting\n");
 430
 431         if (fwe->dma_ch < 0) {
 432                 FWEDEBUG(ifp, "not ready\n");
 433
 434                 ifq_purge(&ifp->if_snd);
 435         } else {
 436                 ifp->if_flags |= IFF_OACTIVE;
 437
 438                 if (!ifq_is_empty(&ifp->if_snd))
 439                         fwe_as_output(fwe, ifp);
 440
 441                 ifp->if_flags &= ~IFF_OACTIVE;
 442         }
 443 }
 444
 445 #define HDR_LEN 4
 446 #ifndef ETHER_ALIGN
 447 #define ETHER_ALIGN 2
 448 #endif
 449 /* Async. stream output */
 450 static void
 451 fwe_as_output(struct fwe_softc *fwe, struct ifnet *ifp)
 452 {
 453         struct mbuf *m;
 454         struct fw_xfer *xfer;
 455         struct fw_xferq *xferq;
 456         struct fw_pkt *fp;
 457         int i = 0;
 458
 459         xfer = NULL;
 460         xferq = fwe->fd.fc->atq;
 461         while (xferq->queued < xferq->maxq - 1) {
 462                 xfer = STAILQ_FIRST(&fwe->xferlist);
 463                 if (xfer == NULL) {
 464                         if_printf(ifp, "lack of xfer\n");
 465                         return;
 466                 }
 467                 m = ifq_dequeue(&ifp->if_snd, NULL);
 468                 if (m == NULL)
 469                         break;
 470                 STAILQ_REMOVE_HEAD(&fwe->xferlist, link);
 471                 BPF_MTAP(ifp, m);
 472
 473                 /* keep ip packet alignment for alpha */
 474                 M_PREPEND(m, ETHER_ALIGN, MB_DONTWAIT);
 475                 fp = &xfer->send.hdr;
 476                 *(u_int32_t *)&xfer->send.hdr = *(int32_t *)&fwe->pkt_hdr;
 477                 fp->mode.stream.len = m->m_pkthdr.len;
 478                 xfer->mbuf = m;
 479                 xfer->send.pay_len = m->m_pkthdr.len;
 480
 481                 if (fw_asyreq(fwe->fd.fc, -1, xfer) != 0) {
 482                         /* error */
 483                         ifp->if_oerrors ++;
 484                         /* XXX set error code */
 485                         fwe_output_callback(xfer);
 486                 } else {
 487                         ifp->if_opackets ++;
 488                         i++;
 489                 }
 490         }
 491 #if 0
 492         if (i > 1)
 493                 if_printf(ifp, "%d queued\n", i);
 494 #endif
 495         if (i > 0)
 496                 xferq->start(fwe->fd.fc);
 497 }
 498
 499 /* Async. stream output */
 500 static void
 501 fwe_as_input(struct fw_xferq *xferq)
 502 {
 503         struct mbuf *m, *m0;
 504         struct ifnet *ifp;
 505         struct fwe_softc *fwe;
 506         struct fw_bulkxfer *sxfer;
 507         struct fw_pkt *fp;
 508         u_char *c;
 509
 510         fwe = (struct fwe_softc *)xferq->sc;
 511         ifp = &fwe->fwe_if;
 512         lwkt_serialize_enter(ifp->if_serializer);
 513         while ((sxfer = STAILQ_FIRST(&xferq->stvalid)) != NULL) {
 514                 STAILQ_REMOVE_HEAD(&xferq->stvalid, link);
 515                 fp = mtod(sxfer->mbuf, struct fw_pkt *);
 516                 if (fwe->fd.fc->irx_post != NULL)
 517                         fwe->fd.fc->irx_post(fwe->fd.fc, fp->mode.ld);
 518                 m = sxfer->mbuf;
 519
 520                 /* insert new rbuf */
 521                 sxfer->mbuf = m0 = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR);
 522                 if (m0 != NULL) {
 523                         m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
 524                         STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
 525                 } else {
 526                         if_printf(ifp, "fwe_as_input: m_getcl failed\n");
 527                 }
 528
 529                 if (sxfer->resp != 0 || fp->mode.stream.len <
 530                     ETHER_ALIGN + sizeof(struct ether_header)) {
 531                         m_freem(m);
 532                         ifp->if_ierrors ++;
 533                         continue;
 534                 }
 535
 536                 m->m_data += HDR_LEN + ETHER_ALIGN;
 537                 c = mtod(m, char *);
 538                 m->m_len = m->m_pkthdr.len =
 539                                 fp->mode.stream.len - ETHER_ALIGN;
 540                 m->m_pkthdr.rcvif = ifp;
 541 #if 0
 542                 FWEDEBUG(ifp, "%02x %02x %02x %02x %02x %02x\n"
 543                          "%02x %02x %02x %02x %02x %02x\n"
 544                          "%02x %02x %02x %02x\n"
 545                          "%02x %02x %02x %02x\n"
 546                          "%02x %02x %02x %02x\n"
 547                          "%02x %02x %02x %02x\n",
 548                          c[0], c[1], c[2], c[3], c[4], c[5],
 549                          c[6], c[7], c[8], c[9], c[10], c[11],
 550                          c[12], c[13], c[14], c[15],
 551                          c[16], c[17], c[18], c[19],
 552                          c[20], c[21], c[22], c[23],
 553                          c[20], c[21], c[22], c[23]
 554                  );
 555 #endif
 556                 ifp->if_input(ifp, m);
 557                 ifp->if_ipackets ++;
 558         }
 559         if (STAILQ_FIRST(&xferq->stfree) != NULL)
 560                 fwe->fd.fc->irx_enable(fwe->fd.fc, fwe->dma_ch);
 561         lwkt_serialize_exit(ifp->if_serializer);
 562 }
 563
 564
 565 static devclass_t fwe_devclass;
 566
 567 /*
 568  * Because fwe is a static device that always exists under any attached
 569  * firewire device, and not scanned by the firewire device, we need an
 570  * identify function to install the device.
 571  */
 572 static device_method_t fwe_methods[] = {
 573         /* device interface */
 574         DEVMETHOD(device_identify,      bus_generic_identify_sameunit),
 575         DEVMETHOD(device_probe,         fwe_probe),
 576         DEVMETHOD(device_attach,        fwe_attach),
 577         DEVMETHOD(device_detach,        fwe_detach),
 578         { 0, 0 }
 579 };
 580
 581 static driver_t fwe_driver = {
 582         "fwe",
 583         fwe_methods,
 584         sizeof(struct fwe_softc),
 585 };
 586
 587
 588 DECLARE_DUMMY_MODULE(fwe);
 589 DRIVER_MODULE(fwe, firewire, fwe_driver, fwe_devclass, 0, 0);
 590 MODULE_VERSION(fwe, 1);
 591 MODULE_DEPEND(fwe, firewire, 1, 1, 1);