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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/dev/usb/misc/udbp.c |
/*-
* Copyright (c) 1996-2000 Whistle Communications, Inc.
* 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. Neither the name of 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 NICK HIBMA 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/usb/misc/udbp.c 223515 2011-06-24 19:32:29Z hselasky $");
/* Driver for arbitrary double bulk pipe devices.
* The driver assumes that there will be the same driver on the other side.
*
* XXX Some more information on what the framing of the IP packets looks like.
*
* To take full advantage of bulk transmission, packets should be chosen
* between 1k and 5k in size (1k to make sure the sending side starts
* streaming, and <5k to avoid overflowing the system with small TDs).
*/
/* probe/attach/detach:
* Connect the driver to the hardware and netgraph
*
* The reason we submit a bulk in transfer is that USB does not know about
* interrupts. The bulk transfer continuously polls the device for data.
* While the device has no data available, the device NAKs the TDs. As soon
* as there is data, the transfer happens and the data comes flowing in.
*
* In case you were wondering, interrupt transfers happen exactly that way.
* It therefore doesn't make sense to use the interrupt pipe to signal
* 'data ready' and then schedule a bulk transfer to fetch it. That would
* incur a 2ms delay at least, without reducing bandwidth requirements.
*
*/
#include <sys/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include "usbdevs.h"
#define USB_DEBUG_VAR udbp_debug
#include <dev/usb/usb_debug.h>
#include <sys/mbuf.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
#include <dev/usb/misc/udbp.h>
#ifdef USB_DEBUG
static int udbp_debug = 0;
SYSCTL_NODE(_hw_usb, OID_AUTO, udbp, CTLFLAG_RW, 0, "USB udbp");
SYSCTL_INT(_hw_usb_udbp, OID_AUTO, debug, CTLFLAG_RW,
&udbp_debug, 0, "udbp debug level");
#endif
#define UDBP_TIMEOUT 2000 /* timeout on outbound transfers, in
* msecs */
#define UDBP_BUFFERSIZE MCLBYTES /* maximum number of bytes in one
* transfer */
#define UDBP_T_WR 0
#define UDBP_T_RD 1
#define UDBP_T_WR_CS 2
#define UDBP_T_RD_CS 3
#define UDBP_T_MAX 4
#define UDBP_Q_MAXLEN 50
struct udbp_softc {
struct mtx sc_mtx;
struct ng_bt_mbufq sc_xmitq_hipri; /* hi-priority transmit queue */
struct ng_bt_mbufq sc_xmitq; /* low-priority transmit queue */
struct usb_xfer *sc_xfer[UDBP_T_MAX];
node_p sc_node; /* back pointer to node */
hook_p sc_hook; /* pointer to the hook */
struct mbuf *sc_bulk_in_buffer;
uint32_t sc_packets_in; /* packets in from downstream */
uint32_t sc_packets_out; /* packets out towards downstream */
uint8_t sc_flags;
#define UDBP_FLAG_READ_STALL 0x01 /* read transfer stalled */
#define UDBP_FLAG_WRITE_STALL 0x02 /* write transfer stalled */
uint8_t sc_name[16];
};
/* prototypes */
static int udbp_modload(module_t mod, int event, void *data);
static device_probe_t udbp_probe;
static device_attach_t udbp_attach;
static device_detach_t udbp_detach;
static usb_callback_t udbp_bulk_read_callback;
static usb_callback_t udbp_bulk_read_clear_stall_callback;
static usb_callback_t udbp_bulk_write_callback;
static usb_callback_t udbp_bulk_write_clear_stall_callback;
static void udbp_bulk_read_complete(node_p, hook_p, void *, int);
static ng_constructor_t ng_udbp_constructor;
static ng_rcvmsg_t ng_udbp_rcvmsg;
static ng_shutdown_t ng_udbp_rmnode;
static ng_newhook_t ng_udbp_newhook;
static ng_connect_t ng_udbp_connect;
static ng_rcvdata_t ng_udbp_rcvdata;
static ng_disconnect_t ng_udbp_disconnect;
/* Parse type for struct ngudbpstat */
static const struct ng_parse_struct_field
ng_udbp_stat_type_fields[] = NG_UDBP_STATS_TYPE_INFO;
static const struct ng_parse_type ng_udbp_stat_type = {
&ng_parse_struct_type,
&ng_udbp_stat_type_fields
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_udbp_cmdlist[] = {
{
NGM_UDBP_COOKIE,
NGM_UDBP_GET_STATUS,
"getstatus",
NULL,
&ng_udbp_stat_type,
},
{
NGM_UDBP_COOKIE,
NGM_UDBP_SET_FLAG,
"setflag",
&ng_parse_int32_type,
NULL
},
{0}
};
/* Netgraph node type descriptor */
static struct ng_type ng_udbp_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_UDBP_NODE_TYPE,
.constructor = ng_udbp_constructor,
.rcvmsg = ng_udbp_rcvmsg,
.shutdown = ng_udbp_rmnode,
.newhook = ng_udbp_newhook,
.connect = ng_udbp_connect,
.rcvdata = ng_udbp_rcvdata,
.disconnect = ng_udbp_disconnect,
.cmdlist = ng_udbp_cmdlist,
};
/* USB config */
static const struct usb_config udbp_config[UDBP_T_MAX] = {
[UDBP_T_WR] = {
.type = UE_BULK,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_OUT,
.bufsize = UDBP_BUFFERSIZE,
.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
.callback = &udbp_bulk_write_callback,
.timeout = UDBP_TIMEOUT,
},
[UDBP_T_RD] = {
.type = UE_BULK,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_IN,
.bufsize = UDBP_BUFFERSIZE,
.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
.callback = &udbp_bulk_read_callback,
},
[UDBP_T_WR_CS] = {
.type = UE_CONTROL,
.endpoint = 0x00, /* Control pipe */
.direction = UE_DIR_ANY,
.bufsize = sizeof(struct usb_device_request),
.callback = &udbp_bulk_write_clear_stall_callback,
.timeout = 1000, /* 1 second */
.interval = 50, /* 50ms */
},
[UDBP_T_RD_CS] = {
.type = UE_CONTROL,
.endpoint = 0x00, /* Control pipe */
.direction = UE_DIR_ANY,
.bufsize = sizeof(struct usb_device_request),
.callback = &udbp_bulk_read_clear_stall_callback,
.timeout = 1000, /* 1 second */
.interval = 50, /* 50ms */
},
};
static devclass_t udbp_devclass;
static device_method_t udbp_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, udbp_probe),
DEVMETHOD(device_attach, udbp_attach),
DEVMETHOD(device_detach, udbp_detach),
{0, 0}
};
static driver_t udbp_driver = {
.name = "udbp",
.methods = udbp_methods,
.size = sizeof(struct udbp_softc),
};
DRIVER_MODULE(udbp, uhub, udbp_driver, udbp_devclass, udbp_modload, 0);
MODULE_DEPEND(udbp, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
MODULE_DEPEND(udbp, usb, 1, 1, 1);
MODULE_VERSION(udbp, 1);
static int
udbp_modload(module_t mod, int event, void *data)
{
int error;
switch (event) {
case MOD_LOAD:
error = ng_newtype(&ng_udbp_typestruct);
if (error != 0) {
printf("%s: Could not register "
"Netgraph node type, error=%d\n",
NG_UDBP_NODE_TYPE, error);
}
break;
case MOD_UNLOAD:
error = ng_rmtype(&ng_udbp_typestruct);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static const STRUCT_USB_HOST_ID udbp_devs[] = {
{USB_VPI(USB_VENDOR_NETCHIP, USB_PRODUCT_NETCHIP_TURBOCONNECT, 0)},
{USB_VPI(USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2301, 0)},
{USB_VPI(USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2302, 0)},
{USB_VPI(USB_VENDOR_ANCHOR, USB_PRODUCT_ANCHOR_EZLINK, 0)},
{USB_VPI(USB_VENDOR_GENESYS, USB_PRODUCT_GENESYS_GL620USB, 0)},
};
static int
udbp_probe(device_t dev)
{
struct usb_attach_arg *uaa = device_get_ivars(dev);
if (uaa->usb_mode != USB_MODE_HOST)
return (ENXIO);
if (uaa->info.bConfigIndex != 0)
return (ENXIO);
if (uaa->info.bIfaceIndex != 0)
return (ENXIO);
return (usbd_lookup_id_by_uaa(udbp_devs, sizeof(udbp_devs), uaa));
}
static int
udbp_attach(device_t dev)
{
struct usb_attach_arg *uaa = device_get_ivars(dev);
struct udbp_softc *sc = device_get_softc(dev);
int error;
device_set_usb_desc(dev);
snprintf(sc->sc_name, sizeof(sc->sc_name),
"%s", device_get_nameunit(dev));
mtx_init(&sc->sc_mtx, "udbp lock", NULL, MTX_DEF | MTX_RECURSE);
error = usbd_transfer_setup(uaa->device, &uaa->info.bIfaceIndex,
sc->sc_xfer, udbp_config, UDBP_T_MAX, sc, &sc->sc_mtx);
if (error) {
DPRINTF("error=%s\n", usbd_errstr(error));
goto detach;
}
NG_BT_MBUFQ_INIT(&sc->sc_xmitq, UDBP_Q_MAXLEN);
NG_BT_MBUFQ_INIT(&sc->sc_xmitq_hipri, UDBP_Q_MAXLEN);
/* create Netgraph node */
if (ng_make_node_common(&ng_udbp_typestruct, &sc->sc_node) != 0) {
printf("%s: Could not create Netgraph node\n",
sc->sc_name);
sc->sc_node = NULL;
goto detach;
}
/* name node */
if (ng_name_node(sc->sc_node, sc->sc_name) != 0) {
printf("%s: Could not name node\n",
sc->sc_name);
NG_NODE_UNREF(sc->sc_node);
sc->sc_node = NULL;
goto detach;
}
NG_NODE_SET_PRIVATE(sc->sc_node, sc);
/* the device is now operational */
return (0); /* success */
detach:
udbp_detach(dev);
return (ENOMEM); /* failure */
}
static int
udbp_detach(device_t dev)
{
struct udbp_softc *sc = device_get_softc(dev);
/* destroy Netgraph node */
if (sc->sc_node != NULL) {
NG_NODE_SET_PRIVATE(sc->sc_node, NULL);
ng_rmnode_self(sc->sc_node);
sc->sc_node = NULL;
}
/* free USB transfers, if any */
usbd_transfer_unsetup(sc->sc_xfer, UDBP_T_MAX);
mtx_destroy(&sc->sc_mtx);
/* destroy queues */
NG_BT_MBUFQ_DESTROY(&sc->sc_xmitq);
NG_BT_MBUFQ_DESTROY(&sc->sc_xmitq_hipri);
/* extra check */
if (sc->sc_bulk_in_buffer) {
m_freem(sc->sc_bulk_in_buffer);
sc->sc_bulk_in_buffer = NULL;
}
return (0); /* success */
}
static void
udbp_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct udbp_softc *sc = usbd_xfer_softc(xfer);
struct usb_page_cache *pc;
struct mbuf *m;
int actlen;
usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
/* allocate new mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
goto tr_setup;
}
MCLGET(m, M_DONTWAIT);
if (!(m->m_flags & M_EXT)) {
m_freem(m);
goto tr_setup;
}
m->m_pkthdr.len = m->m_len = actlen;
pc = usbd_xfer_get_frame(xfer, 0);
usbd_copy_out(pc, 0, m->m_data, actlen);
sc->sc_bulk_in_buffer = m;
DPRINTF("received package %d bytes\n", actlen);
case USB_ST_SETUP:
tr_setup:
if (sc->sc_bulk_in_buffer) {
ng_send_fn(sc->sc_node, NULL, &udbp_bulk_read_complete, NULL, 0);
return;
}
if (sc->sc_flags & UDBP_FLAG_READ_STALL) {
usbd_transfer_start(sc->sc_xfer[UDBP_T_RD_CS]);
return;
}
usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
usbd_transfer_submit(xfer);
return;
default: /* Error */
if (error != USB_ERR_CANCELLED) {
/* try to clear stall first */
sc->sc_flags |= UDBP_FLAG_READ_STALL;
usbd_transfer_start(sc->sc_xfer[UDBP_T_RD_CS]);
}
return;
}
}
static void
udbp_bulk_read_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct udbp_softc *sc = usbd_xfer_softc(xfer);
struct usb_xfer *xfer_other = sc->sc_xfer[UDBP_T_RD];
if (usbd_clear_stall_callback(xfer, xfer_other)) {
DPRINTF("stall cleared\n");
sc->sc_flags &= ~UDBP_FLAG_READ_STALL;
usbd_transfer_start(xfer_other);
}
}
static void
udbp_bulk_read_complete(node_p node, hook_p hook, void *arg1, int arg2)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(node);
struct mbuf *m;
int error;
if (sc == NULL) {
return;
}
mtx_lock(&sc->sc_mtx);
m = sc->sc_bulk_in_buffer;
if (m) {
sc->sc_bulk_in_buffer = NULL;
if ((sc->sc_hook == NULL) ||
NG_HOOK_NOT_VALID(sc->sc_hook)) {
DPRINTF("No upstream hook\n");
goto done;
}
sc->sc_packets_in++;
NG_SEND_DATA_ONLY(error, sc->sc_hook, m);
m = NULL;
}
done:
if (m) {
m_freem(m);
}
/* start USB bulk-in transfer, if not already started */
usbd_transfer_start(sc->sc_xfer[UDBP_T_RD]);
mtx_unlock(&sc->sc_mtx);
}
static void
udbp_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct udbp_softc *sc = usbd_xfer_softc(xfer);
struct usb_page_cache *pc;
struct mbuf *m;
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
sc->sc_packets_out++;
case USB_ST_SETUP:
if (sc->sc_flags & UDBP_FLAG_WRITE_STALL) {
usbd_transfer_start(sc->sc_xfer[UDBP_T_WR_CS]);
return;
}
/* get next mbuf, if any */
NG_BT_MBUFQ_DEQUEUE(&sc->sc_xmitq_hipri, m);
if (m == NULL) {
NG_BT_MBUFQ_DEQUEUE(&sc->sc_xmitq, m);
if (m == NULL) {
DPRINTF("Data queue is empty\n");
return;
}
}
if (m->m_pkthdr.len > MCLBYTES) {
DPRINTF("truncating large packet "
"from %d to %d bytes\n", m->m_pkthdr.len,
MCLBYTES);
m->m_pkthdr.len = MCLBYTES;
}
pc = usbd_xfer_get_frame(xfer, 0);
usbd_m_copy_in(pc, 0, m, 0, m->m_pkthdr.len);
usbd_xfer_set_frame_len(xfer, 0, m->m_pkthdr.len);
DPRINTF("packet out: %d bytes\n", m->m_pkthdr.len);
m_freem(m);
usbd_transfer_submit(xfer);
return;
default: /* Error */
if (error != USB_ERR_CANCELLED) {
/* try to clear stall first */
sc->sc_flags |= UDBP_FLAG_WRITE_STALL;
usbd_transfer_start(sc->sc_xfer[UDBP_T_WR_CS]);
}
return;
}
}
static void
udbp_bulk_write_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct udbp_softc *sc = usbd_xfer_softc(xfer);
struct usb_xfer *xfer_other = sc->sc_xfer[UDBP_T_WR];
if (usbd_clear_stall_callback(xfer, xfer_other)) {
DPRINTF("stall cleared\n");
sc->sc_flags &= ~UDBP_FLAG_WRITE_STALL;
usbd_transfer_start(xfer_other);
}
}
/***********************************************************************
* Start of Netgraph methods
**********************************************************************/
/*
* If this is a device node so this work is done in the attach()
* routine and the constructor will return EINVAL as you should not be able
* to create nodes that depend on hardware (unless you can add the hardware :)
*/
static int
ng_udbp_constructor(node_p node)
{
return (EINVAL);
}
/*
* Give our ok for a hook to be added...
* If we are not running this might kick a device into life.
* Possibly decode information out of the hook name.
* Add the hook's private info to the hook structure.
* (if we had some). In this example, we assume that there is a
* an array of structs, called 'channel' in the private info,
* one for each active channel. The private
* pointer of each hook points to the appropriate UDBP_hookinfo struct
* so that the source of an input packet is easily identified.
*/
static int
ng_udbp_newhook(node_p node, hook_p hook, const char *name)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(node);
int32_t error = 0;
if (strcmp(name, NG_UDBP_HOOK_NAME)) {
return (EINVAL);
}
mtx_lock(&sc->sc_mtx);
if (sc->sc_hook != NULL) {
error = EISCONN;
} else {
sc->sc_hook = hook;
NG_HOOK_SET_PRIVATE(hook, NULL);
}
mtx_unlock(&sc->sc_mtx);
return (error);
}
/*
* Get a netgraph control message.
* Check it is one we understand. If needed, send a response.
* We could save the address for an async action later, but don't here.
* Always free the message.
* The response should be in a malloc'd region that the caller can 'free'.
* A response is not required.
* Theoretically you could respond defferently to old message types if
* the cookie in the header didn't match what we consider to be current
* (so that old userland programs could continue to work).
*/
static int
ng_udbp_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(node);
struct ng_mesg *resp = NULL;
int error = 0;
struct ng_mesg *msg;
NGI_GET_MSG(item, msg);
/* Deal with message according to cookie and command */
switch (msg->header.typecookie) {
case NGM_UDBP_COOKIE:
switch (msg->header.cmd) {
case NGM_UDBP_GET_STATUS:
{
struct ngudbpstat *stats;
NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
if (!resp) {
error = ENOMEM;
break;
}
stats = (struct ngudbpstat *)resp->data;
mtx_lock(&sc->sc_mtx);
stats->packets_in = sc->sc_packets_in;
stats->packets_out = sc->sc_packets_out;
mtx_unlock(&sc->sc_mtx);
break;
}
case NGM_UDBP_SET_FLAG:
if (msg->header.arglen != sizeof(uint32_t)) {
error = EINVAL;
break;
}
DPRINTF("flags = 0x%08x\n",
*((uint32_t *)msg->data));
break;
default:
error = EINVAL; /* unknown command */
break;
}
break;
default:
error = EINVAL; /* unknown cookie type */
break;
}
/* Take care of synchronous response, if any */
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/*
* Accept data from the hook and queue it for output.
*/
static int
ng_udbp_rcvdata(hook_p hook, item_p item)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ng_bt_mbufq *queue_ptr;
struct mbuf *m;
struct ng_tag_prio *ptag;
int error;
if (sc == NULL) {
NG_FREE_ITEM(item);
return (EHOSTDOWN);
}
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/*
* Now queue the data for when it can be sent
*/
ptag = (void *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL);
if (ptag && (ptag->priority > NG_PRIO_CUTOFF))
queue_ptr = &sc->sc_xmitq_hipri;
else
queue_ptr = &sc->sc_xmitq;
mtx_lock(&sc->sc_mtx);
if (NG_BT_MBUFQ_FULL(queue_ptr)) {
NG_BT_MBUFQ_DROP(queue_ptr);
NG_FREE_M(m);
error = ENOBUFS;
} else {
NG_BT_MBUFQ_ENQUEUE(queue_ptr, m);
/*
* start bulk-out transfer, if not already started:
*/
usbd_transfer_start(sc->sc_xfer[UDBP_T_WR]);
error = 0;
}
mtx_unlock(&sc->sc_mtx);
return (error);
}
/*
* Do local shutdown processing..
* We are a persistant device, we refuse to go away, and
* only remove our links and reset ourself.
*/
static int
ng_udbp_rmnode(node_p node)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(node);
/* Let old node go */
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node); /* forget it ever existed */
if (sc == NULL) {
goto done;
}
/* Create Netgraph node */
if (ng_make_node_common(&ng_udbp_typestruct, &sc->sc_node) != 0) {
printf("%s: Could not create Netgraph node\n",
sc->sc_name);
sc->sc_node = NULL;
goto done;
}
/* Name node */
if (ng_name_node(sc->sc_node, sc->sc_name) != 0) {
printf("%s: Could not name Netgraph node\n",
sc->sc_name);
NG_NODE_UNREF(sc->sc_node);
sc->sc_node = NULL;
goto done;
}
NG_NODE_SET_PRIVATE(sc->sc_node, sc);
done:
if (sc) {
mtx_unlock(&sc->sc_mtx);
}
return (0);
}
/*
* This is called once we've already connected a new hook to the other node.
* It gives us a chance to balk at the last minute.
*/
static int
ng_udbp_connect(hook_p hook)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
/* probably not at splnet, force outward queueing */
NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
mtx_lock(&sc->sc_mtx);
sc->sc_flags |= (UDBP_FLAG_READ_STALL |
UDBP_FLAG_WRITE_STALL);
/* start bulk-in transfer */
usbd_transfer_start(sc->sc_xfer[UDBP_T_RD]);
/* start bulk-out transfer */
usbd_transfer_start(sc->sc_xfer[UDBP_T_WR]);
mtx_unlock(&sc->sc_mtx);
return (0);
}
/*
* Dook disconnection
*
* For this type, removal of the last link destroys the node
*/
static int
ng_udbp_disconnect(hook_p hook)
{
struct udbp_softc *sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
int error = 0;
if (sc != NULL) {
mtx_lock(&sc->sc_mtx);
if (hook != sc->sc_hook) {
error = EINVAL;
} else {
/* stop bulk-in transfer */
usbd_transfer_stop(sc->sc_xfer[UDBP_T_RD_CS]);
usbd_transfer_stop(sc->sc_xfer[UDBP_T_RD]);
/* stop bulk-out transfer */
usbd_transfer_stop(sc->sc_xfer[UDBP_T_WR_CS]);
usbd_transfer_stop(sc->sc_xfer[UDBP_T_WR]);
/* cleanup queues */
NG_BT_MBUFQ_DRAIN(&sc->sc_xmitq);
NG_BT_MBUFQ_DRAIN(&sc->sc_xmitq_hipri);
if (sc->sc_bulk_in_buffer) {
m_freem(sc->sc_bulk_in_buffer);
sc->sc_bulk_in_buffer = NULL;
}
sc->sc_hook = NULL;
}
mtx_unlock(&sc->sc_mtx);
}
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
ng_rmnode_self(NG_HOOK_NODE(hook));
return (error);
}