Driver for USB CDC Ethernet devices (USB Host-to-Host), appearing as

network interfaces, transporting Ethernet, supporting Sharp Zaurus and
Prolific PL-2501 (external cable). Written by Craig Boston based on code
from Bill Paul. ok deraadt@

1 files changed, 759 insertions, 0 deletions

diff --git a/sys/dev/usb/if_cdce.c b/sys/dev/usb/if_cdce.c
new file mode 100644
index 00000000000..2aa85deede4
--- /dev/null
+++ b/sys/dev/usb/if_cdce.c
@@ -0,0 +1,759 @@
+/*	$OpenBSD: if_cdce.c,v 1.1 2004/07/20 20:30:09 dhartmei Exp $ */
+
+/*
+ * Copyright (c) 1997, 1998, 1999, 2000-2003 Bill Paul <wpaul@windriver.com>
+ * Copyright (c) 2003 Craig Boston
+ * Copyright (c) 2004 Daniel Hartmeier
+ * 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 Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul, THE VOICES IN HIS HEAD OR
+ * THE 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.
+ */
+
+/*
+ * USB Communication Device Class (Ethernet Networking Control Model)
+ * http://www.usb.org/developers/devclass_docs/usbcdc11.pdf
+ *
+ */
+
+#include <bpfilter.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sockio.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+#include <sys/device.h> 
+#include <sys/proc.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#define BPF_MTAP(ifp, m) bpf_mtap((ifp)->if_bpf, (m))
+#endif
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+
+#include <dev/usb/usb.h>
+#include <dev/usb/usbdi.h>
+#include <dev/usb/usbdi_util.h>
+#include <dev/usb/usbdevs.h>
+#include <dev/usb/usbcdc.h>
+
+#include <dev/usb/if_cdcereg.h>
+
+Static void	*cdce_get_desc(usbd_device_handle dev, int type, int subtype);
+Static int	 cdce_tx_list_init(struct cdce_softc *);
+Static int	 cdce_rx_list_init(struct cdce_softc *);
+Static int	 cdce_newbuf(struct cdce_softc *, struct cdce_chain *,
+		    struct mbuf *);
+Static int	 cdce_encap(struct cdce_softc *, struct mbuf *, int);
+Static void	 cdce_rxeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
+Static void	 cdce_txeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
+Static void	 cdce_start(struct ifnet *);
+Static int	 cdce_ioctl(struct ifnet *, u_long, caddr_t);
+Static void	 cdce_init(void *);
+Static void	 cdce_watchdog(struct ifnet *);
+Static void	 cdce_stop(struct cdce_softc *);
+
+Static const struct cdce_type cdce_devs[] = {
+    {{ USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2501 }, CDCE_NO_UNION },
+    {{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_SL5500 }, CDCE_ZAURUS },
+    {{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_A300 }, CDCE_ZAURUS | CDCE_NO_UNION },
+    {{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_SL5600 }, CDCE_ZAURUS | CDCE_NO_UNION },
+    {{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_C700 }, CDCE_ZAURUS | CDCE_NO_UNION },
+    {{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_C750 }, CDCE_ZAURUS | CDCE_NO_UNION },
+};
+#define cdce_lookup(v, p) ((const struct cdce_type *)usb_lookup(cdce_devs, v, p))
+
+USB_DECLARE_DRIVER_CLASS(cdce, DV_IFNET);
+
+USB_MATCH(cdce)
+{
+	USB_MATCH_START(cdce, uaa);
+	usb_interface_descriptor_t *id;
+
+	if (uaa->iface == NULL)
+		return (UMATCH_NONE);
+
+	id = usbd_get_interface_descriptor(uaa->iface);
+	if (id == NULL)
+		return (UMATCH_NONE);
+    
+	if (cdce_lookup(uaa->vendor, uaa->product) != NULL)
+		return (UMATCH_VENDOR_PRODUCT);
+
+	if (id->bInterfaceClass == UICLASS_CDC && id->bInterfaceSubClass ==
+	    UISUBCLASS_ETHERNET_NETWORKING_CONTROL_MODEL)
+		return (UMATCH_IFACECLASS_GENERIC);
+
+	return (UMATCH_NONE);
+}
+
+USB_ATTACH(cdce)
+{
+	USB_ATTACH_START(cdce, sc, uaa);
+	char				 devinfo[1024];
+	int				 s;
+	struct ifnet			*ifp;
+	usbd_device_handle		 dev = uaa->device;
+	const struct cdce_type		*t;
+	usb_interface_descriptor_t	*id;
+	usb_endpoint_descriptor_t	*ed;
+	usb_cdc_union_descriptor_t	*ud;
+	int				 data_ifcno;
+	u_int16_t			 macaddr_hi;
+	int				 i;
+
+	usbd_devinfo(dev, 0, devinfo, sizeof devinfo);
+	USB_ATTACH_SETUP;
+	printf("%s: %s\n", USBDEVNAME(sc->cdce_dev), devinfo);
+
+	sc->cdce_udev = uaa->device;
+	sc->cdce_ctl_iface = uaa->iface;
+
+	t = cdce_lookup(uaa->vendor, uaa->product);
+	if (t)
+		sc->cdce_flags = t->cdce_flags;
+
+	if (sc->cdce_flags & CDCE_NO_UNION)
+		sc->cdce_data_iface = sc->cdce_ctl_iface;
+	else {
+		ud = cdce_get_desc(sc->cdce_udev, UDESC_CS_INTERFACE,
+		    UDESCSUB_CDC_UNION);
+		if (ud == NULL) {
+			printf("%s: no union descriptor\n",
+			    USBDEVNAME(sc->cdce_dev));
+			USB_ATTACH_ERROR_RETURN;
+		}
+		data_ifcno = ud->bSlaveInterface[0];
+
+		for (i = 0; i < uaa->nifaces; i++) {
+			if (uaa->ifaces[i] != NULL) {
+				id = usbd_get_interface_descriptor(
+				    uaa->ifaces[i]);
+				if (id != NULL && id->bInterfaceNumber ==
+				    data_ifcno) {
+					sc->cdce_data_iface = uaa->ifaces[i];
+					uaa->ifaces[i] = NULL;
+				}
+			}
+		}
+	}
+
+	if (sc->cdce_data_iface == NULL) {
+		printf("%s: no data interface\n", USBDEVNAME(sc->cdce_dev));
+		USB_ATTACH_ERROR_RETURN;
+	}
+    
+	/* Find endpoints. */
+	id = usbd_get_interface_descriptor(sc->cdce_data_iface);
+	sc->cdce_bulkin_no = sc->cdce_bulkout_no = -1;
+	for (i = 0; i < id->bNumEndpoints; i++) {
+		ed = usbd_interface2endpoint_descriptor(sc->cdce_data_iface, i);
+		if (!ed) {
+			printf("%s: could not read endpoint descriptor\n",
+			    USBDEVNAME(sc->cdce_dev));
+			USB_ATTACH_ERROR_RETURN;
+		}
+		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
+		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
+			sc->cdce_bulkin_no = ed->bEndpointAddress;
+		} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
+		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
+			sc->cdce_bulkout_no = ed->bEndpointAddress;
+		} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
+		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
+			/* XXX: CDC spec defines an interrupt pipe, but it is not
+			 * needed for simple host-to-host applications. */
+		} else {
+			printf("%s: unexpected endpoint\n",
+			    USBDEVNAME(sc->cdce_dev));
+		}
+	}
+
+	if (sc->cdce_bulkin_no == -1) {
+		printf("%s: could not find data bulk in\n",
+		    USBDEVNAME(sc->cdce_dev));
+		USB_ATTACH_ERROR_RETURN;
+	}
+	if (sc->cdce_bulkout_no == -1 ) {
+		printf("%s: could not find data bulk out\n",
+		    USBDEVNAME(sc->cdce_dev));
+		USB_ATTACH_ERROR_RETURN;
+	}
+
+	s = splnet();
+
+	macaddr_hi = htons(0x2acb);
+	bcopy(&macaddr_hi, &sc->cdce_arpcom.ac_enaddr[0], sizeof(u_int16_t));
+	bcopy(&ticks, &sc->cdce_arpcom.ac_enaddr[2], sizeof(u_int32_t));
+	sc->cdce_arpcom.ac_enaddr[5] = (u_int8_t)(sc->cdce_unit);
+
+	printf("%s: address %s\n", USBDEVNAME(sc->cdce_dev),
+	    ether_sprintf(sc->cdce_arpcom.ac_enaddr));
+
+	ifp = GET_IFP(sc);
+	ifp->if_softc = sc;
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = cdce_ioctl;
+	ifp->if_start = cdce_start;
+	ifp->if_watchdog = cdce_watchdog;
+	strncpy(ifp->if_xname, USBDEVNAME(sc->cdce_dev), IFNAMSIZ);
+
+	IFQ_SET_READY(&ifp->if_snd);
+
+	if_attach(ifp);
+	Ether_ifattach(ifp, sc->cdce_arpcom.ac_enaddr);
+
+	sc->cdce_attached = 1;
+	splx(s);
+
+	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->cdce_udev,
+	    USBDEV(sc->cdce_dev));
+
+	USB_ATTACH_SUCCESS_RETURN;
+}
+
+USB_DETACH(cdce)
+{
+	USB_DETACH_START(cdce, sc);
+	struct ifnet	*ifp = GET_IFP(sc);
+	int		 s;
+
+	s = splusb();
+
+	if (!sc->cdce_attached) {
+		splx(s);
+		return (0);
+	}
+
+	if (ifp->if_flags & IFF_RUNNING)
+		cdce_stop(sc);
+
+	ether_ifdetach(ifp);
+
+	if_detach(ifp);
+
+	sc->cdce_attached = 0;
+	splx(s);
+
+	return (0);
+}
+
+Static void
+cdce_start(struct ifnet *ifp)
+{
+	struct cdce_softc	*sc = ifp->if_softc;
+	struct mbuf		*m_head = NULL;
+
+	if (sc->cdce_dying || (ifp->if_flags & IFF_OACTIVE))
+		return;
+
+	IFQ_POLL(&ifp->if_snd, m_head);
+	if (m_head == NULL)
+		return;
+
+	if (cdce_encap(sc, m_head, 0)) {
+		ifp->if_flags |= IFF_OACTIVE;
+		return;
+	}
+
+	IFQ_DEQUEUE(&ifp->if_snd, m_head);
+
+#if NBPFILTER > 0
+	if (ifp->if_bpf)
+		BPF_MTAP(ifp, m_head);
+#endif
+
+	ifp->if_flags |= IFF_OACTIVE;
+
+	ifp->if_timer = 6;
+}
+
+Static int
+cdce_encap(struct cdce_softc *sc, struct mbuf *m, int idx)
+{
+	struct cdce_chain	*c;
+	usbd_status		 err;
+	int			 extra = 0;
+
+	c = &sc->cdce_cdata.cdce_tx_chain[idx];
+
+	m_copydata(m, 0, m->m_pkthdr.len, c->cdce_buf);
+	if (sc->cdce_flags & CDCE_ZAURUS) {
+		/* Zaurus wants a 32-bit CRC appended to every frame */
+		u_int32_t crc;
+
+		crc = ether_crc32_le(c->cdce_buf, m->m_pkthdr.len);
+		bcopy(&crc, c->cdce_buf + m->m_pkthdr.len, 4);
+		extra = 4;
+	}
+	c->cdce_mbuf = m;
+
+	usbd_setup_xfer(c->cdce_xfer, sc->cdce_bulkout_pipe, c, c->cdce_buf,
+	    m->m_pkthdr.len + extra, USBD_NO_COPY, 10000, cdce_txeof);
+	err = usbd_transfer(c->cdce_xfer);
+	if (err != USBD_IN_PROGRESS) {
+		cdce_stop(sc);
+		return (EIO);
+	}
+
+	sc->cdce_cdata.cdce_tx_cnt++;
+
+	return (0);
+}
+
+Static void
+cdce_stop(struct cdce_softc *sc)
+{
+	usbd_status	 err;
+	struct ifnet	*ifp = GET_IFP(sc);
+	int		 i;
+
+	ifp->if_timer = 0;
+
+	if (sc->cdce_bulkin_pipe != NULL) {
+		err = usbd_abort_pipe(sc->cdce_bulkin_pipe);
+		if (err)
+			printf("%s: abort rx pipe failed: %s\n",
+			    USBDEVNAME(sc->cdce_dev), usbd_errstr(err));
+		err = usbd_close_pipe(sc->cdce_bulkin_pipe);
+		if (err)
+			printf("%s: close rx pipe failed: %s\n",
+			    USBDEVNAME(sc->cdce_dev), usbd_errstr(err));
+		sc->cdce_bulkin_pipe = NULL;
+	}
+
+	if (sc->cdce_bulkout_pipe != NULL) {
+		err = usbd_abort_pipe(sc->cdce_bulkout_pipe);
+		if (err)
+			printf("%s: abort tx pipe failed: %s\n",
+			    USBDEVNAME(sc->cdce_dev), usbd_errstr(err));
+		err = usbd_close_pipe(sc->cdce_bulkout_pipe);
+		if (err)
+			printf("%s: close tx pipe failed: %s\n",
+			    USBDEVNAME(sc->cdce_dev), usbd_errstr(err));
+		sc->cdce_bulkout_pipe = NULL;
+	}
+
+	for (i = 0; i < CDCE_RX_LIST_CNT; i++) {
+		if (sc->cdce_cdata.cdce_rx_chain[i].cdce_mbuf != NULL) {
+			m_freem(sc->cdce_cdata.cdce_rx_chain[i].cdce_mbuf);
+			sc->cdce_cdata.cdce_rx_chain[i].cdce_mbuf = NULL;
+		}
+		if (sc->cdce_cdata.cdce_rx_chain[i].cdce_xfer != NULL) {
+			usbd_free_xfer(sc->cdce_cdata.cdce_rx_chain[i].cdce_xfer);
+			sc->cdce_cdata.cdce_rx_chain[i].cdce_xfer = NULL;
+		}
+	}
+
+	for (i = 0; i < CDCE_TX_LIST_CNT; i++) {
+		if (sc->cdce_cdata.cdce_tx_chain[i].cdce_mbuf != NULL) {
+			m_freem(sc->cdce_cdata.cdce_tx_chain[i].cdce_mbuf);
+			sc->cdce_cdata.cdce_tx_chain[i].cdce_mbuf = NULL;
+		}
+		if (sc->cdce_cdata.cdce_tx_chain[i].cdce_xfer != NULL) {
+			usbd_free_xfer(sc->cdce_cdata.cdce_tx_chain[i].cdce_xfer);
+			sc->cdce_cdata.cdce_tx_chain[i].cdce_xfer = NULL;
+		}
+	}
+
+	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
+}
+
+Static int
+cdce_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
+{
+	struct cdce_softc	*sc = ifp->if_softc;
+	struct ifaddr		*ifa = (struct ifaddr *)data;
+	struct ifreq		*ifr = (struct ifreq *)data;
+	int			 s, error = 0;
+
+	if (sc->cdce_dying)
+		return (EIO);
+
+	s = splnet();
+
+	switch(command) {
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+		cdce_init(sc);
+		switch (ifa->ifa_addr->sa_family) {
+		case AF_INET:
+			arp_ifinit(&sc->cdce_arpcom, ifa);
+			break;
+		}
+		break;
+
+	case SIOCSIFMTU:
+		if (ifr->ifr_mtu > ETHERMTU)
+			error = EINVAL;
+		else
+			ifp->if_mtu = ifr->ifr_mtu;
+		break;
+
+	case SIOCSIFFLAGS:
+		if (ifp->if_flags & IFF_UP) {
+			if (!(ifp->if_flags & IFF_RUNNING))
+				cdce_init(sc);
+		} else {
+			if (ifp->if_flags & IFF_RUNNING)
+				cdce_stop(sc);
+		}
+		error = 0;
+		break;
+
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	splx(s);
+
+	return (error);
+}
+
+Static void
+cdce_watchdog(struct ifnet *ifp)
+{
+	struct cdce_softc	*sc = ifp->if_softc;
+
+	if (sc->cdce_dying)
+		return;
+
+	ifp->if_oerrors++;
+	printf("%s: watchdog timeout\n", USBDEVNAME(sc->cdce_dev));
+}
+
+Static void
+cdce_init(void *xsc)
+{
+	struct cdce_softc	*sc = xsc;
+	struct ifnet		*ifp = GET_IFP(sc);
+	struct cdce_chain	*c;
+	usbd_status		 err;
+	int			 s, i;
+
+	if (ifp->if_flags & IFF_RUNNING)
+		return;
+
+	s = splnet();
+
+	if (cdce_tx_list_init(sc) == ENOBUFS) {
+		printf("%s: tx list init failed\n", USBDEVNAME(sc->cdce_dev));
+		splx(s);
+		return;
+	}
+
+	if (cdce_rx_list_init(sc) == ENOBUFS) {
+		printf("%s: rx list init failed\n", USBDEVNAME(sc->cdce_dev));
+		splx(s);
+		return;
+	}
+
+	/* Maybe set multicast / broadcast here??? */
+
+	err = usbd_open_pipe(sc->cdce_data_iface, sc->cdce_bulkin_no,
+	    USBD_EXCLUSIVE_USE, &sc->cdce_bulkin_pipe);
+	if (err) {
+		printf("%s: open rx pipe failed: %s\n", USBDEVNAME(sc->cdce_dev),
+		    usbd_errstr(err));
+		splx(s);
+		return;
+	}
+
+	err = usbd_open_pipe(sc->cdce_data_iface, sc->cdce_bulkout_no,
+	    USBD_EXCLUSIVE_USE, &sc->cdce_bulkout_pipe);
+	if (err) {
+		printf("%s: open tx pipe failed: %s\n", USBDEVNAME(sc->cdce_dev),
+		    usbd_errstr(err));
+		splx(s);
+		return;
+	}
+
+	for (i = 0; i < CDCE_RX_LIST_CNT; i++) {
+		c = &sc->cdce_cdata.cdce_rx_chain[i];
+		usbd_setup_xfer(c->cdce_xfer, sc->cdce_bulkin_pipe, c,
+		    c->cdce_buf, CDCE_BUFSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY,
+		    USBD_NO_TIMEOUT, cdce_rxeof);
+		usbd_transfer(c->cdce_xfer);
+	}
+
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+    
+	splx(s);
+}
+
+Static int
+cdce_newbuf(struct cdce_softc *sc, struct cdce_chain *c, struct mbuf *m)
+{
+	struct mbuf	*m_new = NULL;
+
+	if (m == NULL) {
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+	    		printf("%s: no memory for rx list "
+			    "-- packet dropped!\n", USBDEVNAME(sc->cdce_dev));
+			return (ENOBUFS);
+		}
+		MCLGET(m_new, M_DONTWAIT);
+		if (!(m_new->m_flags & M_EXT)) {
+	    		printf("%s: no memory for rx list "
+			    "-- packet dropped!\n", USBDEVNAME(sc->cdce_dev));
+			m_freem(m_new);
+			return (ENOBUFS);
+		}
+		m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
+	} else {
+		m_new = m;
+		m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
+		m_new->m_data = m_new->m_ext.ext_buf;
+	}
+	c->cdce_mbuf = m_new;
+	return (0);
+}
+
+Static int
+cdce_rx_list_init(struct cdce_softc *sc)
+{
+	struct cdce_cdata	*cd;
+	struct cdce_chain	*c;
+	int			 i;
+
+	cd = &sc->cdce_cdata;
+	for (i = 0; i < CDCE_RX_LIST_CNT; i++) {
+		c = &cd->cdce_rx_chain[i];
+		c->cdce_sc = sc;
+		c->cdce_idx = i;
+		if (cdce_newbuf(sc, c, NULL) == ENOBUFS)
+			return (ENOBUFS);
+		if (c->cdce_xfer == NULL) {
+			c->cdce_xfer = usbd_alloc_xfer(sc->cdce_udev);
+			if (c->cdce_xfer == NULL)
+				return (ENOBUFS);
+			c->cdce_buf = usbd_alloc_buffer(c->cdce_xfer, CDCE_BUFSZ);
+			if (c->cdce_buf == NULL)
+				return (ENOBUFS);
+		}
+	}
+
+	return (0);
+}
+
+Static int
+cdce_tx_list_init(struct cdce_softc *sc)
+{
+	struct cdce_cdata	*cd;
+	struct cdce_chain	*c;
+	int			 i;
+
+	cd = &sc->cdce_cdata;
+	for (i = 0; i < CDCE_TX_LIST_CNT; i++) {
+		c = &cd->cdce_tx_chain[i];
+		c->cdce_sc = sc;
+		c->cdce_idx = i;
+		c->cdce_mbuf = NULL;
+		if (c->cdce_xfer == NULL) {
+			c->cdce_xfer = usbd_alloc_xfer(sc->cdce_udev);
+			if (c->cdce_xfer == NULL)
+				return (ENOBUFS);
+			c->cdce_buf = usbd_alloc_buffer(c->cdce_xfer, CDCE_BUFSZ);
+			if (c->cdce_buf == NULL)
+				return (ENOBUFS);
+		}
+	}
+
+	return (0);
+}
+
+Static void
+cdce_rxeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
+{
+	struct cdce_chain	*c = priv;
+	struct cdce_softc	*sc = c->cdce_sc;
+	struct ifnet		*ifp = GET_IFP(sc);
+	struct mbuf		*m;
+	int			 total_len = 0;
+	int			 s;
+
+	if (sc->cdce_dying || !(ifp->if_flags & IFF_RUNNING))
+		return;
+
+	if (status != USBD_NORMAL_COMPLETION) {
+		if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
+			return;
+		if (sc->cdce_rxeof_errors == 0)
+			printf("%s: usb error on rx: %s\n",
+			    USBDEVNAME(sc->cdce_dev), usbd_errstr(status));
+		if (status == USBD_STALLED)
+			usbd_clear_endpoint_stall(sc->cdce_bulkin_pipe);
+		DELAY(sc->cdce_rxeof_errors * 10000);
+		sc->cdce_rxeof_errors++;
+		goto done;
+	}
+
+	sc->cdce_rxeof_errors = 0;
+
+	usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);
+	if (sc->cdce_flags & CDCE_ZAURUS)
+		total_len -= 4;	/* Strip off CRC added by Zaurus */
+	if (total_len <= 1)
+		goto done;
+
+	m = c->cdce_mbuf;
+	memcpy(mtod(m, char *), c->cdce_buf, total_len);
+
+	if (total_len < sizeof(struct ether_header)) {
+		ifp->if_ierrors++;
+		goto done;
+	}
+
+	ifp->if_ipackets++;
+	m->m_pkthdr.len = m->m_len = total_len;
+	m->m_pkthdr.rcvif = ifp;
+
+	s = splnet();
+
+	if (cdce_newbuf(sc, c, NULL) == ENOBUFS) {
+		ifp->if_ierrors++;
+		goto done1;
+	}
+
+#if NBPFILTER > 0
+	if (ifp->if_bpf)
+		BPF_MTAP(ifp, m);
+#endif
+
+	IF_INPUT(ifp, m);
+
+done1:
+	splx(s);
+
+done:
+	/* Setup new transfer. */
+	usbd_setup_xfer(c->cdce_xfer, sc->cdce_bulkin_pipe, c, c->cdce_buf,
+	    CDCE_BUFSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY, USBD_NO_TIMEOUT,
+	    cdce_rxeof);
+	usbd_transfer(c->cdce_xfer);
+}
+
+Static void
+cdce_txeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
+{
+	struct cdce_chain	*c = priv;
+	struct cdce_softc	*sc = c->cdce_sc;
+	struct ifnet		*ifp = GET_IFP(sc);
+	usbd_status		 err;
+	int			 s;
+
+	if (sc->cdce_dying)
+		return;
+
+	s = splnet();
+
+	ifp->if_timer = 0;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	if (status != USBD_NORMAL_COMPLETION) {
+		if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
+			splx(s);
+			return;
+		}
+		ifp->if_oerrors++;
+		printf("%s: usb error on tx: %s\n", USBDEVNAME(sc->cdce_dev),
+		    usbd_errstr(status));
+		if (status == USBD_STALLED)
+			usbd_clear_endpoint_stall(sc->cdce_bulkout_pipe);
+		splx(s);
+		return;
+	}
+
+	usbd_get_xfer_status(c->cdce_xfer, NULL, NULL, NULL, &err);
+
+	if (c->cdce_mbuf != NULL) {
+		m_freem(c->cdce_mbuf);
+		c->cdce_mbuf = NULL;
+	}
+
+	if (err)
+		ifp->if_oerrors++;
+	else
+		ifp->if_opackets++;
+
+	if (IFQ_IS_EMPTY(&ifp->if_snd) == 0)
+		cdce_start(ifp);
+
+	splx(s);
+}
+
+void *
+cdce_get_desc(usbd_device_handle dev, int type, int subtype)
+{
+	usb_descriptor_t	*desc;
+	usb_config_descriptor_t	*cd = usbd_get_config_descriptor(dev);
+	uByte			*p = (uByte *)cd;
+	uByte			*end = p + UGETW(cd->wTotalLength);
+
+	while (p < end) {
+		desc = (usb_descriptor_t *)p;
+		if (desc->bDescriptorType == type &&
+		    desc->bDescriptorSubtype == subtype)
+			return (desc);
+		p += desc->bLength;
+	}
+
+	return (NULL);
+}
+
+int
+cdce_activate(device_ptr_t self, enum devact act)
+{
+	struct cdce_softc *sc = (struct cdce_softc *)self;
+
+	switch (act) {
+	case DVACT_ACTIVATE:
+		return (EOPNOTSUPP);
+		break;
+
+	case DVACT_DEACTIVATE:
+		if_deactivate(GET_IFP(sc));
+		sc->cdce_dying = 1;
+		break;
+	}
+	return (0);
+}