freebsd-dev/sys/dev/usb/if_cdce.c
2005-03-25 12:55:06 +00:00

713 lines
18 KiB
C

/* $NetBSD: if_cdce.c,v 1.4 2004/10/24 12:50:54 augustss Exp $ */
/*
* Copyright (c) 1997, 1998, 1999, 2000-2003 Bill Paul <wpaul@windriver.com>
* Copyright (c) 2003-2005 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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/module.h>
#include <sys/socket.h>
#include <sys/endian.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/bpf.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdivar.h>
#include <dev/usb/usb_ethersubr.h>
#include <dev/usb/usbcdc.h>
#include "usbdevs.h"
#include <dev/usb/if_cdcereg.h>
Static device_shutdown_t cdce_shutdown;
USB_DECLARE_DRIVER_INIT(cdce,
DEVMETHOD(device_probe, cdce_match),
DEVMETHOD(device_attach, cdce_attach),
DEVMETHOD(device_detach, cdce_detach),
DEVMETHOD(device_shutdown, cdce_shutdown)
);
DRIVER_MODULE(cdce, uhub, cdce_driver, cdce_devclass, usbd_driver_load, 0);
MODULE_VERSION(cdce, 0);
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_reset(struct cdce_softc *);
Static void cdce_stop(struct cdce_softc *);
Static void cdce_rxstart(struct ifnet *);
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_SLA300 }, CDCE_ZAURUS | CDCE_NO_UNION },
{{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_SL5600 }, CDCE_ZAURUS | CDCE_NO_UNION },
{{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_SLC700 }, CDCE_ZAURUS | CDCE_NO_UNION },
{{ USB_VENDOR_SHARP, USB_PRODUCT_SHARP_SLC750 }, CDCE_ZAURUS | CDCE_NO_UNION },
{{ USB_VENDOR_GMATE, USB_PRODUCT_GMATE_YP3X00 }, CDCE_NO_UNION },
};
#define cdce_lookup(v, p) ((const struct cdce_type *)usb_lookup(cdce_devs, v, p))
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);
struct ifnet *ifp;
usbd_device_handle dev = uaa->device;
const struct cdce_type *t;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;
const usb_cdc_union_descriptor_t *ud;
usb_config_descriptor_t *cd;
int data_ifcno;
int i, j, numalts;
u_char eaddr[ETHER_ADDR_LEN];
const usb_cdc_ethernet_descriptor_t *ue;
char eaddr_str[USB_MAX_STRING_LEN];
bzero(sc, sizeof(struct cdce_softc));
sc->cdce_dev = self;
usbd_devinfo(dev, 0, sc->devinfo);
device_set_desc_copy(self, sc->devinfo);
printf("%s: %s\n", USBDEVNAME(sc->cdce_dev), sc->devinfo);
sc->cdce_udev = uaa->device;
sc->cdce_unit = device_get_unit(self);
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 = uaa->iface;
else {
ud = (const usb_cdc_union_descriptor_t *)usb_find_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;
}
/*
* <quote>
* The Data Class interface of a networking device shall have a minimum
* of two interface settings. The first setting (the default interface
* setting) includes no endpoints and therefore no networking traffic is
* exchanged whenever the default interface setting is selected. One or
* more additional interface settings are used for normal operation, and
* therefore each includes a pair of endpoints (one IN, and one OUT) to
* exchange network traffic. Select an alternate interface setting to
* initialize the network aspects of the device and to enable the
* exchange of network traffic.
* </quote>
*
* Some devices, most notably cable modems, include interface settings
* that have no IN or OUT endpoint, therefore loop through the list of all
* available interface settings looking for one with both IN and OUT
* endpoints.
*/
id = usbd_get_interface_descriptor(sc->cdce_data_iface);
cd = usbd_get_config_descriptor(sc->cdce_udev);
numalts = usbd_get_no_alts(cd, id->bInterfaceNumber);
for (j = 0; j < numalts; j++) {
if (usbd_set_interface(sc->cdce_data_iface, j)) {
printf("%s: setting alternate interface failed\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 we found something, try and use it... */
if ((sc->cdce_bulkin_no != -1) && (sc->cdce_bulkout_no != -1))
break;
}
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;
}
mtx_init(&sc->cdce_mtx, USBDEVNAME(sc->cdce_dev), MTX_NETWORK_LOCK,
MTX_DEF | MTX_RECURSE);
CDCE_LOCK(sc);
ue = (const usb_cdc_ethernet_descriptor_t *)usb_find_desc(dev,
UDESC_INTERFACE, UDESCSUB_CDC_ENF);
if (!ue || usbd_get_string(dev, ue->iMacAddress, eaddr_str)) {
/* Fake MAC address */
printf("%s: faking MAC address\n", USBDEVNAME(sc->cdce_dev));
eaddr[0]= 0x2a;
memcpy(&eaddr[1], &ticks, sizeof(u_int32_t));
eaddr[5] = (u_int8_t)(sc->cdce_unit);
} else {
int i;
memset(eaddr, 0, ETHER_ADDR_LEN);
for (i = 0; i < ETHER_ADDR_LEN * 2; i++) {
int c = eaddr_str[i];
if ('0' <= c && c <= '9')
c -= '0';
else
c -= 'A' - 10;
c &= 0xf;
if (c % 2 == 0)
c <<= 4;
eaddr[i / 2] |= c;
}
}
bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
ifp = GET_IFP(sc);
ifp->if_softc = sc;
if_initname(ifp, "cdce", sc->cdce_unit);
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
IFF_NEEDSGIANT;
ifp->if_ioctl = cdce_ioctl;
ifp->if_output = ether_output;
ifp->if_start = cdce_start;
ifp->if_init = cdce_init;
ifp->if_baudrate = 11000000;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
sc->q.ifp = ifp;
sc->q.if_rxstart = cdce_rxstart;
ether_ifattach(ifp, eaddr);
usb_register_netisr();
CDCE_UNLOCK(sc);
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;
CDCE_LOCK(sc);
sc->cdce_dying = 1;
ifp = GET_IFP(sc);
if (ifp->if_flags & IFF_RUNNING)
cdce_shutdown(sc->cdce_dev);
ether_ifdetach(ifp);
CDCE_UNLOCK(sc);
mtx_destroy(&sc->cdce_mtx);
return (0);
}
Static void
cdce_start(struct ifnet *ifp)
{
struct cdce_softc *sc;
struct mbuf *m_head = NULL;
sc = ifp->if_softc;
CDCE_LOCK(sc);
if (sc->cdce_dying ||
ifp->if_flags & IFF_OACTIVE ||
!(ifp->if_flags & IFF_RUNNING)) {
CDCE_UNLOCK(sc);
return;
}
IF_DEQUEUE(&ifp->if_snd, m_head);
if (m_head == NULL) {
CDCE_UNLOCK(sc);
return;
}
if (cdce_encap(sc, m_head, 0)) {
IF_PREPEND(&ifp->if_snd, m_head);
ifp->if_flags |= IFF_OACTIVE;
CDCE_UNLOCK(sc);
return;
}
BPF_MTAP(ifp, m_head);
ifp->if_flags |= IFF_OACTIVE;
CDCE_UNLOCK(sc);
return;
}
Static int
cdce_encap(struct cdce_softc *sc, struct mbuf *m, int idx)
{
struct ue_chain *c;
usbd_status err;
int extra = 0;
c = &sc->cdce_cdata.ue_tx_chain[idx];
m_copydata(m, 0, m->m_pkthdr.len, c->ue_buf);
if (sc->cdce_flags & CDCE_ZAURUS) {
/* Zaurus wants a 32-bit CRC appended to every frame */
u_int32_t crc;
crc = htole32(crc32(c->ue_buf, m->m_pkthdr.len));
bcopy(&crc, c->ue_buf + m->m_pkthdr.len, 4);
extra = 4;
}
c->ue_mbuf = m;
usbd_setup_xfer(c->ue_xfer, sc->cdce_bulkout_pipe, c, c->ue_buf,
m->m_pkthdr.len + extra, 0, 10000, cdce_txeof);
err = usbd_transfer(c->ue_xfer);
if (err != USBD_IN_PROGRESS) {
cdce_stop(sc);
return (EIO);
}
sc->cdce_cdata.ue_tx_cnt++;
return (0);
}
Static void
cdce_stop(struct cdce_softc *sc)
{
usbd_status err;
struct ifnet *ifp;
CDCE_LOCK(sc);
cdce_reset(sc);
ifp = GET_IFP(sc);
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;
}
usb_ether_rx_list_free(&sc->cdce_cdata);
usb_ether_tx_list_free(&sc->cdce_cdata);
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
CDCE_UNLOCK(sc);
return;
}
Static int
cdce_shutdown(device_ptr_t dev)
{
struct cdce_softc *sc;
sc = device_get_softc(dev);
cdce_stop(sc);
return (0);
}
Static int
cdce_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct cdce_softc *sc = ifp->if_softc;
int error = 0;
if (sc->cdce_dying)
return (ENXIO);
switch(command) {
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 = ether_ioctl(ifp, command, data);
break;
}
return (error);
}
Static void
cdce_reset(struct cdce_softc *sc)
{
/* XXX Maybe reset the bulk pipes here? */
return;
}
Static void
cdce_init(void *xsc)
{
struct cdce_softc *sc = xsc;
struct ifnet *ifp = GET_IFP(sc);
struct ue_chain *c;
usbd_status err;
int i;
if (ifp->if_flags & IFF_RUNNING)
return;
CDCE_LOCK(sc);
cdce_reset(sc);
if (usb_ether_tx_list_init(sc, &sc->cdce_cdata,
sc->cdce_udev) == ENOBUFS) {
printf("%s: tx list init failed\n", USBDEVNAME(sc->cdce_dev));
CDCE_UNLOCK(sc);
return;
}
if (usb_ether_rx_list_init(sc, &sc->cdce_cdata,
sc->cdce_udev) == ENOBUFS) {
printf("%s: rx list init failed\n", USBDEVNAME(sc->cdce_dev));
CDCE_UNLOCK(sc);
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));
CDCE_UNLOCK(sc);
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));
CDCE_UNLOCK(sc);
return;
}
for (i = 0; i < UE_RX_LIST_CNT; i++) {
c = &sc->cdce_cdata.ue_rx_chain[i];
usbd_setup_xfer(c->ue_xfer, sc->cdce_bulkin_pipe, c,
mtod(c->ue_mbuf, char *), UE_BUFSZ, USBD_SHORT_XFER_OK,
USBD_NO_TIMEOUT, cdce_rxeof);
usbd_transfer(c->ue_xfer);
}
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
CDCE_UNLOCK(sc);
return;
}
Static void
cdce_rxeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
{
struct ue_chain *c = priv;
struct cdce_softc *sc = c->ue_sc;
struct ifnet *ifp;
struct mbuf *m;
int total_len = 0;
CDCE_LOCK(sc);
ifp = GET_IFP(sc);
if (sc->cdce_dying || !(ifp->if_flags & IFF_RUNNING)) {
CDCE_UNLOCK(sc);
return;
}
if (status != USBD_NORMAL_COMPLETION) {
if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
CDCE_UNLOCK(sc);
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 */
m = c->ue_mbuf;
if (total_len < sizeof(struct ether_header)) {
ifp->if_ierrors++;
goto done;
}
ifp->if_ipackets++;
m->m_pkthdr.rcvif = (struct ifnet *)&sc->q;
m->m_pkthdr.len = m->m_len = total_len;
/* Put the packet on the special USB input queue. */
usb_ether_input(m);
CDCE_UNLOCK(sc);
return;
done:
/* Setup new transfer. */
usbd_setup_xfer(c->ue_xfer, sc->cdce_bulkin_pipe, c,
mtod(c->ue_mbuf, char *),
UE_BUFSZ, USBD_SHORT_XFER_OK, USBD_NO_TIMEOUT,
cdce_rxeof);
usbd_transfer(c->ue_xfer);
CDCE_UNLOCK(sc);
return;
}
Static void
cdce_txeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
{
struct ue_chain *c = priv;
struct cdce_softc *sc = c->ue_sc;
struct ifnet *ifp;
usbd_status err;
CDCE_LOCK(sc);
ifp = GET_IFP(sc);
if (sc->cdce_dying ||
!(ifp->if_flags & IFF_RUNNING)) {
CDCE_UNLOCK(sc);
return;
}
if (status != USBD_NORMAL_COMPLETION) {
if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
CDCE_UNLOCK(sc);
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);
CDCE_UNLOCK(sc);
return;
}
ifp->if_flags &= ~IFF_OACTIVE;
usbd_get_xfer_status(c->ue_xfer, NULL, NULL, NULL, &err);
if (c->ue_mbuf != NULL) {
c->ue_mbuf->m_pkthdr.rcvif = ifp;
usb_tx_done(c->ue_mbuf);
c->ue_mbuf = NULL;
}
if (err)
ifp->if_oerrors++;
else
ifp->if_opackets++;
CDCE_UNLOCK(sc);
return;
}
Static void
cdce_rxstart(struct ifnet *ifp)
{
struct cdce_softc *sc;
struct ue_chain *c;
sc = ifp->if_softc;
CDCE_LOCK(sc);
if (sc->cdce_dying || !(ifp->if_flags & IFF_RUNNING)) {
CDCE_UNLOCK(sc);
return;
}
c = &sc->cdce_cdata.ue_rx_chain[sc->cdce_cdata.ue_rx_prod];
c->ue_mbuf = usb_ether_newbuf();
if (c->ue_mbuf == NULL) {
printf("%s: no memory for rx list "
"-- packet dropped!\n", USBDEVNAME(sc->cdce_dev));
ifp->if_ierrors++;
CDCE_UNLOCK(sc);
return;
}
usbd_setup_xfer(c->ue_xfer, sc->cdce_bulkin_pipe, c,
mtod(c->ue_mbuf, char *), UE_BUFSZ, USBD_SHORT_XFER_OK,
USBD_NO_TIMEOUT, cdce_rxeof);
usbd_transfer(c->ue_xfer);
CDCE_UNLOCK(sc);
return;
}