/*      $NetBSD: if_fwip.c,v 1.32 2024/07/05 04:31:51 rin Exp $ */
/*-
 * Copyright (c) 2004
 *      Doug Rabson
 * Copyright (c) 2002-2003
 *      Hidetoshi Shimokawa. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *
 *      This product includes software developed by Hidetoshi Shimokawa.
 *
 * 4. Neither the name of the author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/dev/firewire/if_fwip.c,v 1.18 2009/02/09 16:58:18 fjoe Exp $
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_fwip.c,v 1.32 2024/07/05 04:31:51 rin Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>

#include <net/bpf.h>
#include <net/if.h>
#include <net/if_ieee1394.h>
#include <net/if_types.h>

#include <dev/ieee1394/firewire.h>
#include <dev/ieee1394/firewirereg.h>
#include <dev/ieee1394/iec13213.h>
#include <dev/ieee1394/if_fwipvar.h>

/*
 * We really need a mechanism for allocating regions in the FIFO
 * address space. We pick a address in the OHCI controller's 'middle'
 * address space. This means that the controller will automatically
 * send responses for us, which is fine since we don't have any
 * important information to put in the response anyway.
 */
#define INET_FIFO       0xfffe00000000LL

#define FWIPDEBUG       if (fwipdebug) aprint_debug_ifnet
#define TX_MAX_QUEUE    (FWMAXQUEUE - 1)


struct fw_hwaddr {
        uint32_t                sender_unique_ID_hi;
        uint32_t                sender_unique_ID_lo;
        uint8_t                 sender_max_rec;
        uint8_t                 sspd;
        uint16_t                sender_unicast_FIFO_hi;
        uint32_t                sender_unicast_FIFO_lo;
};


static int fwipmatch(device_t, cfdata_t, void *);
static void fwipattach(device_t, device_t, void *);
static int fwipdetach(device_t, int);
static int fwipactivate(device_t, enum devact);

/* network interface */
static void fwip_start(struct ifnet *);
static int fwip_ioctl(struct ifnet *, u_long, void *);
static int fwip_init(struct ifnet *);
static void fwip_stop(struct ifnet *, int);

static void fwip_post_busreset(void *);
static void fwip_output_callback(struct fw_xfer *);
static void fwip_async_output(struct fwip_softc *, struct ifnet *);
static void fwip_stream_input(struct fw_xferq *);
static void fwip_unicast_input(struct fw_xfer *);

static int fwipdebug = 0;
static int broadcast_channel = 0xc0 | 0x1f; /*  tag | channel(XXX) */
static int tx_speed = 2;
static int rx_queue_len = FWMAXQUEUE;

/*
 * Setup sysctl(3) MIB, hw.fwip.*
 *
 * TBD condition CTLFLAG_PERMANENT on being a module or not
 */
SYSCTL_SETUP(sysctl_fwip, "sysctl fwip(4) subtree setup")
{
        int rc, fwip_node_num;
        const struct sysctlnode *node;

        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT, CTLTYPE_NODE, "fwip",
            SYSCTL_DESCR("fwip controls"),
            NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }
        fwip_node_num = node->sysctl_num;

        /* fwip RX queue length */
        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
            "rx_queue_len", SYSCTL_DESCR("Length of the receive queue"),
            NULL, 0, &rx_queue_len,
            0, CTL_HW, fwip_node_num, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }

        /* fwip RX queue length */
        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
            "if_fwip_debug", SYSCTL_DESCR("fwip driver debug flag"),
            NULL, 0, &fwipdebug,
            0, CTL_HW, fwip_node_num, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }

        return;

err:
        aprint_error("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
}


CFATTACH_DECL_NEW(fwip, sizeof(struct fwip_softc),
    fwipmatch, fwipattach, fwipdetach, fwipactivate);


static int
fwipmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct fw_attach_args *fwa = aux;

        if (strcmp(fwa->name, "fwip") == 0)
                return 1;
        return 0;
}

static void
fwipattach(device_t parent, device_t self, void *aux)
{
        struct fwip_softc *sc = device_private(self);
        struct fw_attach_args *fwa = (struct fw_attach_args *)aux;
        struct fw_hwaddr *hwaddr;
        struct ifnet *ifp;

        aprint_naive("\n");
        aprint_normal(": IP over IEEE1394\n");

        sc->sc_fd.dev = self;
        sc->sc_eth.fwip_ifp = &sc->sc_eth.fwcom.fc_if;
        hwaddr = (struct fw_hwaddr *)&sc->sc_eth.fwcom.ic_hwaddr;

        ifp = sc->sc_eth.fwip_ifp;

        mutex_init(&sc->sc_fwb.fwb_mtx, MUTEX_DEFAULT, IPL_NET);
        mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_NET);

        /* XXX */
        sc->sc_dma_ch = -1;

        sc->sc_fd.fc = fwa->fc;
        if (tx_speed < 0)
                tx_speed = sc->sc_fd.fc->speed;

        sc->sc_fd.post_explore = NULL;
        sc->sc_fd.post_busreset = fwip_post_busreset;
        sc->sc_eth.fwip = sc;

        /*
         * Encode our hardware the way that arp likes it.
         */
        hwaddr->sender_unique_ID_hi = htonl(sc->sc_fd.fc->eui.hi);
        hwaddr->sender_unique_ID_lo = htonl(sc->sc_fd.fc->eui.lo);
        hwaddr->sender_max_rec = sc->sc_fd.fc->maxrec;
        hwaddr->sspd = sc->sc_fd.fc->speed;
        hwaddr->sender_unicast_FIFO_hi = htons((uint16_t)(INET_FIFO >> 32));
        hwaddr->sender_unicast_FIFO_lo = htonl((uint32_t)INET_FIFO);

        /* fill the rest and attach interface */
        ifp->if_softc = &sc->sc_eth;

        strlcpy(ifp->if_xname, device_xname(self), IFNAMSIZ);
        ifp->if_start = fwip_start;
        ifp->if_ioctl = fwip_ioctl;
        ifp->if_init = fwip_init;
        ifp->if_stop = fwip_stop;
        ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
        IFQ_SET_READY(&ifp->if_snd);
        IFQ_SET_MAXLEN(&ifp->if_snd, TX_MAX_QUEUE);

        if_attach(ifp);
        ieee1394_ifattach(ifp, (const struct ieee1394_hwaddr *)hwaddr);

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "couldn't establish power handler\n");
        else
                pmf_class_network_register(self, ifp);

        FWIPDEBUG(ifp, "interface created\n");
        return;
}

static int
fwipdetach(device_t self, int flags)
{
        struct fwip_softc *sc = device_private(self);
        struct ifnet *ifp = sc->sc_eth.fwip_ifp;

        fwip_stop(sc->sc_eth.fwip_ifp, 1);
        ieee1394_ifdetach(ifp);
        if_detach(ifp);
        mutex_destroy(&sc->sc_mtx);
        mutex_destroy(&sc->sc_fwb.fwb_mtx);
        return 0;
}

static int
fwipactivate(device_t self, enum devact act)
{
        struct fwip_softc *sc = device_private(self);

        switch (act) {
        case DVACT_DEACTIVATE:
                if_deactivate(sc->sc_eth.fwip_ifp);
                return 0;
        default:
                return EOPNOTSUPP;
        }
}

static void
fwip_start(struct ifnet *ifp)
{
        struct fwip_softc *sc = ((struct fwip_eth_softc *)ifp->if_softc)->fwip;

        FWIPDEBUG(ifp, "starting\n");

        if (sc->sc_dma_ch < 0) {
                struct mbuf *m = NULL;

                FWIPDEBUG(ifp, "not ready\n");

                do {
                        IF_DEQUEUE(&ifp->if_snd, m);
                        m_freem(m);
                        if_statinc(ifp, if_oerrors);
                } while (m != NULL);

                return;
        }

        ifp->if_flags |= IFF_OACTIVE;

        if (ifp->if_snd.ifq_len != 0)
                fwip_async_output(sc, ifp);

        ifp->if_flags &= ~IFF_OACTIVE;
}

static int
fwip_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
        int s, error = 0;

        s = splnet();

        switch (cmd) {
        case SIOCSIFFLAGS:
                if ((error = ifioctl_common(ifp, cmd, data)) != 0)
                        break;
                switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) {
                case IFF_RUNNING:
                        fwip_stop(ifp, 0);
                        break;
                case IFF_UP:
                        fwip_init(ifp);
                        break;
                default:
                        break;
                }
                break;

        case SIOCADDMULTI:
        case SIOCDELMULTI:
                break;

        default:
                error = ieee1394_ioctl(ifp, cmd, data);
                if (error == ENETRESET)
                        error = 0;
                break;
        }

        splx(s);

        return error;
}

static int
fwip_init(struct ifnet *ifp)
{
        struct fwip_softc *sc = ((struct fwip_eth_softc *)ifp->if_softc)->fwip;
        struct firewire_comm *fc;
        struct fw_xferq *xferq;
        struct fw_xfer *xfer;
        struct mbuf *m;
        int i;

        FWIPDEBUG(ifp, "initializing\n");

        fc = sc->sc_fd.fc;
        if (sc->sc_dma_ch < 0) {
                sc->sc_dma_ch = fw_open_isodma(fc, /* tx */0);
                if (sc->sc_dma_ch < 0)
                        return ENXIO;
                xferq = fc->ir[sc->sc_dma_ch];
                xferq->flag |=
                    FWXFERQ_EXTBUF | FWXFERQ_HANDLER | FWXFERQ_STREAM;
                xferq->flag &= ~0xff;
                xferq->flag |= broadcast_channel & 0xff;
                /* register fwip_input handler */
                xferq->sc = (void *) sc;
                xferq->hand = fwip_stream_input;
                xferq->bnchunk = rx_queue_len;
                xferq->bnpacket = 1;
                xferq->psize = MCLBYTES;
                xferq->queued = 0;
                xferq->buf = NULL;
                xferq->bulkxfer = (struct fw_bulkxfer *) malloc(
                        sizeof(struct fw_bulkxfer) * xferq->bnchunk,
                                                        M_FW, M_WAITOK);
                if (xferq->bulkxfer == NULL) {
                        aprint_error_ifnet(ifp, "if_fwip: malloc failed\n");
                        return ENOMEM;
                }
                STAILQ_INIT(&xferq->stvalid);
                STAILQ_INIT(&xferq->stfree);
                STAILQ_INIT(&xferq->stdma);
                xferq->stproc = NULL;
                for (i = 0; i < xferq->bnchunk; i++) {
                        m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
                        xferq->bulkxfer[i].mbuf = m;
                        if (m != NULL) {
                                m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
                                STAILQ_INSERT_TAIL(&xferq->stfree,
                                                &xferq->bulkxfer[i], link);
                        } else
                                aprint_error_ifnet(ifp,
                                    "fwip_as_input: m_getcl failed\n");
                }

                sc->sc_fwb.start = INET_FIFO;
                sc->sc_fwb.end = INET_FIFO + 16384; /* S3200 packet size */

                /* pre-allocate xfer */
                STAILQ_INIT(&sc->sc_fwb.xferlist);
                for (i = 0; i < rx_queue_len; i++) {
                        xfer = fw_xfer_alloc(M_FW);
                        if (xfer == NULL)
                                break;
                        m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
                        xfer->recv.payload = mtod(m, uint32_t *);
                        xfer->recv.pay_len = MCLBYTES;
                        xfer->hand = fwip_unicast_input;
                        xfer->fc = fc;
                        xfer->sc = (void *) sc;
                        xfer->mbuf = m;
                        STAILQ_INSERT_TAIL(&sc->sc_fwb.xferlist, xfer, link);
                }
                fw_bindadd(fc, &sc->sc_fwb);

                STAILQ_INIT(&sc->sc_xferlist);
                for (i = 0; i < TX_MAX_QUEUE; i++) {
                        xfer = fw_xfer_alloc(M_FW);
                        if (xfer == NULL)
                                break;
                        xfer->send.spd = tx_speed;
                        xfer->fc = sc->sc_fd.fc;
                        xfer->sc = (void *)sc;
                        xfer->hand = fwip_output_callback;
                        STAILQ_INSERT_TAIL(&sc->sc_xferlist, xfer, link);
                }
        } else
                xferq = fc->ir[sc->sc_dma_ch];

        sc->sc_last_dest.hi = 0;
        sc->sc_last_dest.lo = 0;

        /* start dma */
        if ((xferq->flag & FWXFERQ_RUNNING) == 0)
                fc->irx_enable(fc, sc->sc_dma_ch);

        ifp->if_flags |= IFF_RUNNING;
        ifp->if_flags &= ~IFF_OACTIVE;

#if 0
        /* attempt to start output */
        fwip_start(ifp);
#endif
        return 0;
}

static void
fwip_stop(struct ifnet *ifp, int disable)
{
        struct fwip_softc *sc = ((struct fwip_eth_softc *)ifp->if_softc)->fwip;
        struct firewire_comm *fc = sc->sc_fd.fc;
        struct fw_xferq *xferq;
        struct fw_xfer *xfer, *next;
        int i;

        if (sc->sc_dma_ch >= 0) {
                xferq = fc->ir[sc->sc_dma_ch];

                if (xferq->flag & FWXFERQ_RUNNING)
                        fc->irx_disable(fc, sc->sc_dma_ch);
                xferq->flag &=
                        ~(FWXFERQ_MODEMASK | FWXFERQ_OPEN | FWXFERQ_STREAM |
                        FWXFERQ_EXTBUF | FWXFERQ_HANDLER | FWXFERQ_CHTAGMASK);
                xferq->hand = NULL;

                for (i = 0; i < xferq->bnchunk; i++)
                        m_freem(xferq->bulkxfer[i].mbuf);
                free(xferq->bulkxfer, M_FW);

                fw_bindremove(fc, &sc->sc_fwb);
                for (xfer = STAILQ_FIRST(&sc->sc_fwb.xferlist); xfer != NULL;
                    xfer = next) {
                        next = STAILQ_NEXT(xfer, link);
                        fw_xfer_free(xfer);
                }

                for (xfer = STAILQ_FIRST(&sc->sc_xferlist); xfer != NULL;
                    xfer = next) {
                        next = STAILQ_NEXT(xfer, link);
                        fw_xfer_free(xfer);
                }

                xferq->bulkxfer = NULL;
                sc->sc_dma_ch = -1;
        }

        ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
}

static void
fwip_post_busreset(void *arg)
{
        struct fwip_softc *sc = arg;
        struct crom_src *src;
        struct crom_chunk *root;

        src = sc->sc_fd.fc->crom_src;
        root = sc->sc_fd.fc->crom_root;

        /* RFC2734 IPv4 over IEEE1394 */
        memset(&sc->sc_unit4, 0, sizeof(struct crom_chunk));
        crom_add_chunk(src, root, &sc->sc_unit4, CROM_UDIR);
        crom_add_entry(&sc->sc_unit4, CSRKEY_SPEC, CSRVAL_IETF);
        crom_add_simple_text(src, &sc->sc_unit4, &sc->sc_spec4, "IANA");
        crom_add_entry(&sc->sc_unit4, CSRKEY_VER, 1);
        crom_add_simple_text(src, &sc->sc_unit4, &sc->sc_ver4, "IPv4");

        /* RFC3146 IPv6 over IEEE1394 */
        memset(&sc->sc_unit6, 0, sizeof(struct crom_chunk));
        crom_add_chunk(src, root, &sc->sc_unit6, CROM_UDIR);
        crom_add_entry(&sc->sc_unit6, CSRKEY_SPEC, CSRVAL_IETF);
        crom_add_simple_text(src, &sc->sc_unit6, &sc->sc_spec6, "IANA");
        crom_add_entry(&sc->sc_unit6, CSRKEY_VER, 2);
        crom_add_simple_text(src, &sc->sc_unit6, &sc->sc_ver6, "IPv6");

        sc->sc_last_dest.hi = 0;
        sc->sc_last_dest.lo = 0;
        ieee1394_drain(sc->sc_eth.fwip_ifp);
}

static void
fwip_output_callback(struct fw_xfer *xfer)
{
        struct fwip_softc *sc = (struct fwip_softc *)xfer->sc;
        struct ifnet *ifp;

        ifp = sc->sc_eth.fwip_ifp;
        /* XXX error check */
        FWIPDEBUG(ifp, "resp = %d\n", xfer->resp);
        if (xfer->resp != 0)
                if_statinc(ifp, if_oerrors);

        m_freem(xfer->mbuf);
        fw_xfer_unload(xfer);

        mutex_enter(&sc->sc_mtx);
        STAILQ_INSERT_TAIL(&sc->sc_xferlist, xfer, link);
        mutex_exit(&sc->sc_mtx);

        /* for queue full */
        if (ifp->if_snd.ifq_head != NULL)
                fwip_start(ifp);
}

/* Async. stream output */
static void
fwip_async_output(struct fwip_softc *sc, struct ifnet *ifp)
{
        struct firewire_comm *fc = sc->sc_fd.fc;
        struct mbuf *m;
        struct m_tag *mtag;
        struct fw_hwaddr *destfw;
        struct fw_xfer *xfer;
        struct fw_xferq *xferq;
        struct fw_pkt *fp;
        uint16_t nodeid;
        int error;
        int i = 0;

        xfer = NULL;
        xferq = fc->atq;
        while ((xferq->queued < xferq->maxq - 1) &&
            (ifp->if_snd.ifq_head != NULL)) {
                mutex_enter(&sc->sc_mtx);
                if (STAILQ_EMPTY(&sc->sc_xferlist)) {
                        mutex_exit(&sc->sc_mtx);
#if 0
                        aprint_normal("if_fwip: lack of xfer\n");
#endif
                        break;
                }
                IF_POLL(&ifp->if_snd, m);
                if (m == NULL) {
                        mutex_exit(&sc->sc_mtx);
                        break;
                }
                xfer = STAILQ_FIRST(&sc->sc_xferlist);
                STAILQ_REMOVE_HEAD(&sc->sc_xferlist, link);
                mutex_exit(&sc->sc_mtx);

                /*
                 * Dig out the link-level address which
                 * firewire_output got via arp or neighbour
                 * discovery. If we don't have a link-level address,
                 * just stick the thing on the broadcast channel.
                 */
                mtag = m_tag_find(m, MTAG_FIREWIRE_HWADDR);
                if (mtag == NULL)
                        destfw = 0;
                else
                        destfw = (struct fw_hwaddr *) (mtag + 1);

                /*
                 * Put the mbuf in the xfer early in case we hit an
                 * error case below - fwip_output_callback will free
                 * the mbuf.
                 */
                xfer->mbuf = m;

                /*
                 * We use the arp result (if any) to add a suitable firewire
                 * packet header before handing off to the bus.
                 */
                fp = &xfer->send.hdr;
                nodeid = FWLOCALBUS | fc->nodeid;
                if ((m->m_flags & M_BCAST) || !destfw) {
                        /*
                         * Broadcast packets are sent as GASP packets with
                         * specifier ID 0x00005e, version 1 on the broadcast
                         * channel. To be conservative, we send at the
                         * slowest possible speed.
                         */
                        uint32_t *p;

                        M_PREPEND(m, 2 * sizeof(uint32_t), M_DONTWAIT);
                        p = mtod(m, uint32_t *);
                        fp->mode.stream.len = m->m_pkthdr.len;
                        fp->mode.stream.chtag = broadcast_channel;
                        fp->mode.stream.tcode = FWTCODE_STREAM;
                        fp->mode.stream.sy = 0;
                        xfer->send.spd = 0;
                        p[0] = htonl(nodeid << 16);
                        p[1] = htonl((0x5e << 24) | 1);
                } else {
                        /*
                         * Unicast packets are sent as block writes to the
                         * target's unicast fifo address. If we can't
                         * find the node address, we just give up. We
                         * could broadcast it but that might overflow
                         * the packet size limitations due to the
                         * extra GASP header. Note: the hardware
                         * address is stored in network byte order to
                         * make life easier for ARP.
                         */
                        struct fw_device *fd;
                        struct fw_eui64 eui;

                        eui.hi = ntohl(destfw->sender_unique_ID_hi);
                        eui.lo = ntohl(destfw->sender_unique_ID_lo);
                        if (sc->sc_last_dest.hi != eui.hi ||
                            sc->sc_last_dest.lo != eui.lo) {
                                fd = fw_noderesolve_eui64(fc, &eui);
                                if (!fd) {
                                        /* error */
                                        if_statinc(ifp, if_oerrors);
                                        /* XXX set error code */
                                        fwip_output_callback(xfer);
                                        continue;

                                }
                                sc->sc_last_hdr.mode.wreqb.dst =
                                    FWLOCALBUS | fd->dst;
                                sc->sc_last_hdr.mode.wreqb.tlrt = 0;
                                sc->sc_last_hdr.mode.wreqb.tcode =
                                    FWTCODE_WREQB;
                                sc->sc_last_hdr.mode.wreqb.pri = 0;
                                sc->sc_last_hdr.mode.wreqb.src = nodeid;
                                sc->sc_last_hdr.mode.wreqb.dest_hi =
                                        ntohs(destfw->sender_unicast_FIFO_hi);
                                sc->sc_last_hdr.mode.wreqb.dest_lo =
                                        ntohl(destfw->sender_unicast_FIFO_lo);
                                sc->sc_last_hdr.mode.wreqb.extcode = 0;
                                sc->sc_last_dest = eui;
                        }

                        fp->mode.wreqb = sc->sc_last_hdr.mode.wreqb;
                        fp->mode.wreqb.len = m->m_pkthdr.len;
                        xfer->send.spd = uimin(destfw->sspd, fc->speed);
                }

                xfer->send.pay_len = m->m_pkthdr.len;

                error = fw_asyreq(fc, -1, xfer);
                if (error == EAGAIN) {
                        /*
                         * We ran out of tlabels - requeue the packet
                         * for later transmission.
                         */
                        xfer->mbuf = 0;
                        mutex_enter(&sc->sc_mtx);
                        STAILQ_INSERT_TAIL(&sc->sc_xferlist, xfer, link);
                        mutex_exit(&sc->sc_mtx);
                        break;
                }
                IF_DEQUEUE(&ifp->if_snd, m);
                if (error) {
                        /* error */
                        if_statinc(ifp, if_oerrors);
                        /* XXX set error code */
                        fwip_output_callback(xfer);
                        continue;
                } else {
                        if_statinc(ifp, if_opackets);
                        i++;
                }
        }
#if 0
        if (i > 1)
                aprint_normal("%d queued\n", i);
#endif
        if (i > 0)
                xferq->start(fc);
}

/* Async. stream output */
static void
fwip_stream_input(struct fw_xferq *xferq)
{
        struct mbuf *m, *m0;
        struct m_tag *mtag;
        struct ifnet *ifp;
        struct fwip_softc *sc;
        struct fw_bulkxfer *sxfer;
        struct fw_pkt *fp;
        uint16_t src;
        uint32_t *p;

        sc = (struct fwip_softc *)xferq->sc;
        ifp = sc->sc_eth.fwip_ifp;
        while ((sxfer = STAILQ_FIRST(&xferq->stvalid)) != NULL) {
                STAILQ_REMOVE_HEAD(&xferq->stvalid, link);
                fp = mtod(sxfer->mbuf, struct fw_pkt *);
                if (sc->sc_fd.fc->irx_post != NULL)
                        sc->sc_fd.fc->irx_post(sc->sc_fd.fc, fp->mode.ld);
                m = sxfer->mbuf;

                /* insert new rbuf */
                sxfer->mbuf = m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
                if (m0 != NULL) {
                        m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
                        STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
                } else
                        aprint_error_ifnet(ifp,
                            "fwip_as_input: m_getcl failed\n");

                /*
                 * We must have a GASP header - leave the
                 * encapsulation sanity checks to the generic
                 * code. Remeber that we also have the firewire async
                 * stream header even though that isn't accounted for
                 * in mode.stream.len.
                 */
                if (sxfer->resp != 0 ||
                    fp->mode.stream.len < 2 * sizeof(uint32_t)) {
                        m_freem(m);
                        if_statinc(ifp, if_ierrors);
                        continue;
                }
                m->m_len = m->m_pkthdr.len = fp->mode.stream.len
                        + sizeof(fp->mode.stream);

                /*
                 * If we received the packet on the broadcast channel,
                 * mark it as broadcast, otherwise we assume it must
                 * be multicast.
                 */
                if (fp->mode.stream.chtag == broadcast_channel)
                        m->m_flags |= M_BCAST;
                else
                        m->m_flags |= M_MCAST;

                /*
                 * Make sure we recognise the GASP specifier and
                 * version.
                 */
                p = mtod(m, uint32_t *);
                if ((((ntohl(p[1]) & 0xffff) << 8) | ntohl(p[2]) >> 24) !=
                                                                0x00005e ||
                    (ntohl(p[2]) & 0xffffff) != 1) {
                        FWIPDEBUG(ifp, "Unrecognised GASP header %#08x %#08x\n",
                            ntohl(p[1]), ntohl(p[2]));
                        m_freem(m);
                        if_statinc(ifp, if_ierrors);
                        continue;
                }

                /*
                 * Record the sender ID for possible BPF usage.
                 */
                src = ntohl(p[1]) >> 16;
                if (ifp->if_bpf) {
                        mtag = m_tag_get(MTAG_FIREWIRE_SENDER_EUID,
                            2 * sizeof(uint32_t), M_NOWAIT);
                        if (mtag) {
                                /* bpf wants it in network byte order */
                                struct fw_device *fd;
                                uint32_t *p2 = (uint32_t *) (mtag + 1);

                                fd = fw_noderesolve_nodeid(sc->sc_fd.fc,
                                    src & 0x3f);
                                if (fd) {
                                        p2[0] = htonl(fd->eui.hi);
                                        p2[1] = htonl(fd->eui.lo);
                                } else {
                                        p2[0] = 0;
                                        p2[1] = 0;
                                }
                                m_tag_prepend(m, mtag);
                        }
                }

                /*
                 * Trim off the GASP header
                 */
                m_adj(m, 3*sizeof(uint32_t));
                m_set_rcvif(m, ifp);
                ieee1394_input(ifp, m, src);
                if_statinc(ifp, if_ipackets);
        }
        if (STAILQ_FIRST(&xferq->stfree) != NULL)
                sc->sc_fd.fc->irx_enable(sc->sc_fd.fc, sc->sc_dma_ch);
}

static inline void
fwip_unicast_input_recycle(struct fwip_softc *sc, struct fw_xfer *xfer)
{
        struct mbuf *m;

        /*
         * We have finished with a unicast xfer. Allocate a new
         * cluster and stick it on the back of the input queue.
         */
        m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
        if (m == NULL)
                aprint_error_dev(sc->sc_fd.dev,
                    "fwip_unicast_input_recycle: m_getcl failed\n");
        xfer->recv.payload = mtod(m, uint32_t *);
        xfer->recv.pay_len = MCLBYTES;
        xfer->mbuf = m;
        mutex_enter(&sc->sc_fwb.fwb_mtx);
        STAILQ_INSERT_TAIL(&sc->sc_fwb.xferlist, xfer, link);
        mutex_exit(&sc->sc_fwb.fwb_mtx);
}

static void
fwip_unicast_input(struct fw_xfer *xfer)
{
        uint64_t address;
        struct mbuf *m;
        struct m_tag *mtag;
        struct ifnet *ifp;
        struct fwip_softc *sc;
        struct fw_pkt *fp;
        int rtcode;

        sc = (struct fwip_softc *)xfer->sc;
        ifp = sc->sc_eth.fwip_ifp;
        m = xfer->mbuf;
        xfer->mbuf = 0;
        fp = &xfer->recv.hdr;

        /*
         * Check the fifo address - we only accept addresses of
         * exactly INET_FIFO.
         */
        address = ((uint64_t)fp->mode.wreqb.dest_hi << 32)
                | fp->mode.wreqb.dest_lo;
        if (fp->mode.wreqb.tcode != FWTCODE_WREQB) {
                rtcode = FWRCODE_ER_TYPE;
        } else if (address != INET_FIFO) {
                rtcode = FWRCODE_ER_ADDR;
        } else {
                rtcode = FWRCODE_COMPLETE;
        }

        /*
         * Pick up a new mbuf and stick it on the back of the receive
         * queue.
         */
        fwip_unicast_input_recycle(sc, xfer);

        /*
         * If we've already rejected the packet, give up now.
         */
        if (rtcode != FWRCODE_COMPLETE) {
                m_freem(m);
                if_statinc(ifp, if_ierrors);
                return;
        }

        if (ifp->if_bpf) {
                /*
                 * Record the sender ID for possible BPF usage.
                 */
                mtag = m_tag_get(MTAG_FIREWIRE_SENDER_EUID,
                    2 * sizeof(uint32_t), M_NOWAIT);
                if (mtag) {
                        /* bpf wants it in network byte order */
                        struct fw_device *fd;
                        uint32_t *p = (uint32_t *) (mtag + 1);

                        fd = fw_noderesolve_nodeid(sc->sc_fd.fc,
                            fp->mode.wreqb.src & 0x3f);
                        if (fd) {
                                p[0] = htonl(fd->eui.hi);
                                p[1] = htonl(fd->eui.lo);
                        } else {
                                p[0] = 0;
                                p[1] = 0;
                        }
                        m_tag_prepend(m, mtag);
                }
        }

        /*
         * Hand off to the generic encapsulation code. We don't use
         * ifp->if_input so that we can pass the source nodeid as an
         * argument to facilitate link-level fragment reassembly.
         */
        m->m_len = m->m_pkthdr.len = fp->mode.wreqb.len;
        m_set_rcvif(m, ifp);
        ieee1394_input(ifp, m, fp->mode.wreqb.src);
        if_statinc(ifp, if_ipackets);
}