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Staging: USB/IP: add host driver

Browse Source 
This adds the USB IP client driver

Brian Merrell cleaned up a lot of this code and submitted it for
inclusion.  Greg also did a lot of cleanup.

Signed-off-by: Brian G. Merrell <bgmerrell@novell.com>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Takahiro Hirofuchi 2008-07-09 14:56:51 -06:00 committed by Greg Kroah-Hartman
parent 04679b3489
commit 4d7b5c7f8a
7 changed files with 1878 additions and 0 deletions
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11
drivers/staging/usbip/Kconfig
View File

@ -23,3 +23,14 @@ config USB_IP_VHCI_HCD
To compile this driver as a module, choose M here: the
module will be called vhci_hcd.
config USB_IP_HOST
tristate "USB IP host driver"
depends on USB_IP_COMMON
default N
---help---
This enables the USB IP device driver which will run on the
host machine.
To compile this driver as a module, choose M here: the
module will be called usbip.

3
drivers/staging/usbip/Makefile
View File

@ -4,6 +4,9 @@ usbip_common_mod-objs := usbip_common.o usbip_event.o
obj-$(CONFIG_USB_IP_VHCI_HCD) += vhci-hcd.o
vhci-hcd-objs := vhci_sysfs.o vhci_tx.o vhci_rx.o vhci_hcd.o
obj-$(CONFIG_USB_IP_HOST) += usbip.o
usbip-objs := stub_dev.o stub_main.o stub_rx.o stub_tx.o
ifeq ($(CONFIG_USB_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
endif

95
drivers/staging/usbip/stub.h Normal file
View File

@ -0,0 +1,95 @@
/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/net.h>
struct stub_device {
struct usb_interface *interface;
struct list_head list;
struct usbip_device ud;
__u32 devid;
/*
* stub_priv preserves private data of each urb.
* It is allocated as stub_priv_cache and assigned to urb->context.
*
* stub_priv is always linked to any one of 3 lists;
* priv_init: linked to this until the comletion of a urb.
* priv_tx : linked to this after the completion of a urb.
* priv_free: linked to this after the sending of the result.
*
* Any of these list operations should be locked by priv_lock.
*/
spinlock_t priv_lock;
struct list_head priv_init;
struct list_head priv_tx;
struct list_head priv_free;
/* see comments for unlinking in stub_rx.c */
struct list_head unlink_tx;
struct list_head unlink_free;
wait_queue_head_t tx_waitq;
};
/* private data into urb->priv */
struct stub_priv {
unsigned long seqnum;
struct list_head list;
struct stub_device *sdev;
struct urb *urb;
int unlinking;
};
struct stub_unlink {
unsigned long seqnum;
struct list_head list;
__u32 status;
};
extern struct kmem_cache *stub_priv_cache;
/*-------------------------------------------------------------------------*/
/* prototype declarations */
/* stub_tx.c */
void stub_complete(struct urb *);
void stub_tx_loop(struct usbip_task *);
/* stub_dev.c */
extern struct usb_driver stub_driver;
/* stub_rx.c */
void stub_rx_loop(struct usbip_task *);
void stub_enqueue_ret_unlink(struct stub_device *, __u32, __u32);
/* stub_main.c */
int match_busid(char *busid);
void stub_device_cleanup_urbs(struct stub_device *sdev);

483
drivers/staging/usbip/stub_dev.c Normal file
View File

@ -0,0 +1,483 @@
/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
#include "stub.h"
static int stub_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void stub_disconnect(struct usb_interface *interface);
/*
* Define device IDs here if you want to explicitly limit exportable devices.
* In the most cases, wild card matching will be ok because driver binding can
* be changed dynamically by a userland program.
*/
static struct usb_device_id stub_table[] = {
#if 0
/* just an example */
{ USB_DEVICE(0x05ac, 0x0301) }, /* Mac 1 button mouse */
{ USB_DEVICE(0x0430, 0x0009) }, /* Plat Home Keyboard */
{ USB_DEVICE(0x059b, 0x0001) }, /* Iomega USB Zip 100 */
{ USB_DEVICE(0x04b3, 0x4427) }, /* IBM USB CD-ROM */
{ USB_DEVICE(0x05a9, 0xa511) }, /* LifeView USB cam */
{ USB_DEVICE(0x55aa, 0x0201) }, /* Imation card reader */
{ USB_DEVICE(0x046d, 0x0870) }, /* Qcam Express(QV-30) */
{ USB_DEVICE(0x04bb, 0x0101) }, /* IO-DATA HD 120GB */
{ USB_DEVICE(0x04bb, 0x0904) }, /* IO-DATA USB-ET/TX */
{ USB_DEVICE(0x04bb, 0x0201) }, /* IO-DATA USB-ET/TX */
{ USB_DEVICE(0x08bb, 0x2702) }, /* ONKYO USB Speaker */
{ USB_DEVICE(0x046d, 0x08b2) }, /* Logicool Qcam 4000 Pro */
#endif
/* magic for wild card */
{ .driver_info = 1 },
{ 0, } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, stub_table);
struct usb_driver stub_driver = {
.name = "usbip",
.probe = stub_probe,
.disconnect = stub_disconnect,
.id_table = stub_table,
};
/*-------------------------------------------------------------------------*/
/* Define sysfs entries for a usbip-bound device */
/*
* usbip_status shows status of usbip as long as this driver is bound to the
* target device.
*/
static ssize_t show_status(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stub_device *sdev = dev_get_drvdata(dev);
int status;
if (!sdev) {
dev_err(dev, "sdev is null\n");
return -ENODEV;
}
spin_lock(&sdev->ud.lock);
status = sdev->ud.status;
spin_unlock(&sdev->ud.lock);
return snprintf(buf, PAGE_SIZE, "%d\n", status);
}
static DEVICE_ATTR(usbip_status, S_IRUGO, show_status, NULL);
/*
* usbip_sockfd gets a socket descriptor of an established TCP connection that
* is used to transfer usbip requests by kernel threads. -1 is a magic number
* by which usbip connection is finished.
*/
static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct stub_device *sdev = dev_get_drvdata(dev);
int sockfd = 0;
struct socket *socket;
if (!sdev) {
dev_err(dev, "sdev is null\n");
return -ENODEV;
}
sscanf(buf, "%d", &sockfd);
if (sockfd != -1) {
dev_info(dev, "stub up\n");
spin_lock(&sdev->ud.lock);
if (sdev->ud.status != SDEV_ST_AVAILABLE) {
dev_err(dev, "not ready\n");
spin_unlock(&sdev->ud.lock);
return -EINVAL;
}
socket = sockfd_to_socket(sockfd);
if (!socket) {
spin_unlock(&sdev->ud.lock);
return -EINVAL;
}
#if 0
setnodelay(socket);
setkeepalive(socket);
setreuse(socket);
#endif
sdev->ud.tcp_socket = socket;
spin_unlock(&sdev->ud.lock);
usbip_start_threads(&sdev->ud);
spin_lock(&sdev->ud.lock);
sdev->ud.status = SDEV_ST_USED;
spin_unlock(&sdev->ud.lock);
} else {
dev_info(dev, "stub down\n");
spin_lock(&sdev->ud.lock);
if (sdev->ud.status != SDEV_ST_USED) {
spin_unlock(&sdev->ud.lock);
return -EINVAL;
}
spin_unlock(&sdev->ud.lock);
usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN);
}
return count;
}
static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
static int stub_add_files(struct device *dev)
{
int err = 0;
err = device_create_file(dev, &dev_attr_usbip_status);
if (err)
goto err_status;
err = device_create_file(dev, &dev_attr_usbip_sockfd);
if (err)
goto err_sockfd;
err = device_create_file(dev, &dev_attr_usbip_debug);
if (err)
goto err_debug;
return 0;
err_debug:
device_remove_file(dev, &dev_attr_usbip_sockfd);
err_sockfd:
device_remove_file(dev, &dev_attr_usbip_status);
err_status:
return err;
}
static void stub_remove_files(struct device *dev)
{
device_remove_file(dev, &dev_attr_usbip_status);
device_remove_file(dev, &dev_attr_usbip_sockfd);
device_remove_file(dev, &dev_attr_usbip_debug);
}
/*-------------------------------------------------------------------------*/
/* Event handler functions called by an event handler thread */
static void stub_shutdown_connection(struct usbip_device *ud)
{
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
/*
* When removing an exported device, kernel panic sometimes occurred
* and then EIP was sk_wait_data of stub_rx thread. Is this because
* sk_wait_data returned though stub_rx thread was already finished by
* step 1?
*/
if (ud->tcp_socket) {
udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
}
/* 1. stop threads */
usbip_stop_threads(ud);
/* 2. close the socket */
/*
* tcp_socket is freed after threads are killed.
* So usbip_xmit do not touch NULL socket.
*/
if (ud->tcp_socket) {
sock_release(ud->tcp_socket);
ud->tcp_socket = NULL;
}
/* 3. free used data */
stub_device_cleanup_urbs(sdev);
/* 4. free stub_unlink */
{
unsigned long flags;
struct stub_unlink *unlink, *tmp;
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
list_del(&unlink->list);
kfree(unlink);
}
list_for_each_entry_safe(unlink, tmp,
&sdev->unlink_free, list) {
list_del(&unlink->list);
kfree(unlink);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
}
}
static void stub_device_reset(struct usbip_device *ud)
{
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
struct usb_device *udev = interface_to_usbdev(sdev->interface);
int ret;
udbg("device reset");
ret = usb_lock_device_for_reset(udev, sdev->interface);
if (ret < 0) {
dev_err(&udev->dev, "lock for reset\n");
spin_lock(&ud->lock);
ud->status = SDEV_ST_ERROR;
spin_unlock(&ud->lock);
return;
}
/* try to reset the device */
ret = usb_reset_device(udev);
usb_unlock_device(udev);
spin_lock(&ud->lock);
if (ret) {
dev_err(&udev->dev, "device reset\n");
ud->status = SDEV_ST_ERROR;
} else {
dev_info(&udev->dev, "device reset\n");
ud->status = SDEV_ST_AVAILABLE;
}
spin_unlock(&ud->lock);
return;
}
static void stub_device_unusable(struct usbip_device *ud)
{
spin_lock(&ud->lock);
ud->status = SDEV_ST_ERROR;
spin_unlock(&ud->lock);
}
/*-------------------------------------------------------------------------*/
/**
* stub_device_alloc - allocate a new stub_device struct
* @interface: usb_interface of a new device
*
* Allocates and initializes a new stub_device struct.
*/
static struct stub_device *stub_device_alloc(struct usb_interface *interface)
{
struct stub_device *sdev;
int busnum = interface_to_busnum(interface);
int devnum = interface_to_devnum(interface);
dev_dbg(&interface->dev, "allocating stub device");
/* yes, it's a new device */
sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL);
if (!sdev) {
dev_err(&interface->dev, "no memory for stub_device\n");
return NULL;
}
sdev->interface = interface;
/*
* devid is defined with devnum when this driver is first allocated.
* devnum may change later if a device is reset. However, devid never
* changes during a usbip connection.
*/
sdev->devid = (busnum << 16) | devnum;
usbip_task_init(&sdev->ud.tcp_rx, "stub_rx", stub_rx_loop);
usbip_task_init(&sdev->ud.tcp_tx, "stub_tx", stub_tx_loop);
sdev->ud.side = USBIP_STUB;
sdev->ud.status = SDEV_ST_AVAILABLE;
/* sdev->ud.lock = SPIN_LOCK_UNLOCKED; */
spin_lock_init(&sdev->ud.lock);
sdev->ud.tcp_socket = NULL;
INIT_LIST_HEAD(&sdev->priv_init);
INIT_LIST_HEAD(&sdev->priv_tx);
INIT_LIST_HEAD(&sdev->priv_free);
INIT_LIST_HEAD(&sdev->unlink_free);
INIT_LIST_HEAD(&sdev->unlink_tx);
/* sdev->priv_lock = SPIN_LOCK_UNLOCKED; */
spin_lock_init(&sdev->priv_lock);
init_waitqueue_head(&sdev->tx_waitq);
sdev->ud.eh_ops.shutdown = stub_shutdown_connection;
sdev->ud.eh_ops.reset = stub_device_reset;
sdev->ud.eh_ops.unusable = stub_device_unusable;
usbip_start_eh(&sdev->ud);
udbg("register new interface\n");
return sdev;
}
static int stub_device_free(struct stub_device *sdev)
{
if (!sdev)
return -EINVAL;
kfree(sdev);
udbg("kfree udev ok\n");
return 0;
}
/*-------------------------------------------------------------------------*/
/*
* If a usb device has multiple active interfaces, this driver is bound to all
* the active interfaces. However, usbip exports *a* usb device (i.e., not *an*
* active interface). Currently, a userland program must ensure that it
* looks at the usbip's sysfs entries of only the first active interface.
*
* TODO: use "struct usb_device_driver" to bind a usb device.
* However, it seems it is not fully supported in mainline kernel yet
* (2.6.19.2).
*/
static int stub_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct stub_device *sdev = NULL;
char *udev_busid = interface->dev.parent->bus_id;
int err = 0;
dev_dbg(&interface->dev, "Enter\n");
/* check we should claim or not by busid_table */
if (match_busid(udev_busid)) {
dev_info(&interface->dev,
"this device %s is not in match_busid table. skip!\n",
udev_busid);
/*
* Return value should be ENODEV or ENOXIO to continue trying
* other matched drivers by the driver core.
* See driver_probe_device() in driver/base/dd.c
*/
return -ENODEV;
}
if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) {
udbg("this device %s is a usb hub device. skip!\n",
udev_busid);
return -ENODEV;
}
if (!strcmp(udev->bus->bus_name, "vhci_hcd")) {
udbg("this device %s is attached on vhci_hcd. skip!\n",
udev_busid);
return -ENODEV;
}
/* ok. this is my device. */
sdev = stub_device_alloc(interface);
if (!sdev)
return -ENOMEM;
dev_info(&interface->dev, "USB/IP Stub: register a new interface "
"(bus %u dev %u ifn %u)\n", udev->bus->busnum, udev->devnum,
interface->cur_altsetting->desc.bInterfaceNumber);
/* set private data to usb_interface */
usb_set_intfdata(interface, sdev);
err = stub_add_files(&interface->dev);
if (err) {
dev_err(&interface->dev, "create sysfs files for %s\n",
udev_busid);
return err;
}
return 0;
}
/*
* called in usb_disconnect() or usb_deregister()
* but only if actconfig(active configuration) exists
*/
static void stub_disconnect(struct usb_interface *interface)
{
struct stub_device *sdev = usb_get_intfdata(interface);
udbg("Enter\n");
/* get stub_device */
if (!sdev) {
err(" could not get device from inteface data");
/* BUG(); */
return;
}
usb_set_intfdata(interface, NULL);
/*
* NOTE:
* rx/tx threads are invoked for each usb_device.
*/
stub_remove_files(&interface->dev);
/* 1. shutdown the current connection */
usbip_event_add(&sdev->ud, SDEV_EVENT_REMOVED);
/* 2. wait for the stop of the event handler */
usbip_stop_eh(&sdev->ud);
/* 3. free sdev */
stub_device_free(sdev);
udbg("bye\n");
}

300
drivers/staging/usbip/stub_main.c Normal file
View File

@ -0,0 +1,300 @@
/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
#include "stub.h"
/* Version Information */
#define DRIVER_VERSION "1.0"
#define DRIVER_AUTHOR "Takahiro Hirofuchi"
#define DRIVER_DESC "Stub Driver for USB/IP"
/* stub_priv is allocated from stub_priv_cache */
struct kmem_cache *stub_priv_cache;
/*-------------------------------------------------------------------------*/
/* Define sysfs entries for the usbip driver */
/*
* busid_tables defines matching busids that usbip can grab. A user can change
* dynamically what device is locally used and what device is exported to a
* remote host.
*/
#define MAX_BUSID 16
static char busid_table[MAX_BUSID][BUS_ID_SIZE];
static spinlock_t busid_table_lock;
int match_busid(char *busid)
{
int i;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (busid_table[i][0])
if (!strncmp(busid_table[i], busid, BUS_ID_SIZE)) {
/* already registerd */
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return 1;
}
static ssize_t show_match_busid(struct device_driver *drv, char *buf)
{
int i;
char *out = buf;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (busid_table[i][0])
out += sprintf(out, "%s ", busid_table[i]);
spin_unlock(&busid_table_lock);
out += sprintf(out, "\n");
return out - buf;
}
static int add_match_busid(char *busid)
{
int i;
if (!match_busid(busid))
return 0;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (!busid_table[i][0]) {
strncpy(busid_table[i], busid, BUS_ID_SIZE);
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return -1;
}
static int del_match_busid(char *busid)
{
int i;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (!strncmp(busid_table[i], busid, BUS_ID_SIZE)) {
/* found */
memset(busid_table[i], 0, BUS_ID_SIZE);
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return -1;
}
static ssize_t store_match_busid(struct device_driver *dev, const char *buf,
size_t count)
{
int len;
char busid[BUS_ID_SIZE];
if (count < 5)
return -EINVAL;
/* strnlen() does not include \0 */
len = strnlen(buf + 4, BUS_ID_SIZE);
/* busid needs to include \0 termination */
if (!(len < BUS_ID_SIZE))
return -EINVAL;
strncpy(busid, buf + 4, BUS_ID_SIZE);
if (!strncmp(buf, "add ", 4)) {
if (add_match_busid(busid) < 0)
return -ENOMEM;
else {
udbg("add busid %s\n", busid);
return count;
}
} else if (!strncmp(buf, "del ", 4)) {
if (del_match_busid(busid) < 0)
return -ENODEV;
else {
udbg("del busid %s\n", busid);
return count;
}
} else
return -EINVAL;
}
static DRIVER_ATTR(match_busid, S_IRUSR|S_IWUSR, show_match_busid,
store_match_busid);
/*-------------------------------------------------------------------------*/
/* Cleanup functions used to free private data */
static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
{
struct stub_priv *priv, *tmp;
list_for_each_entry_safe(priv, tmp, listhead, list) {
list_del(&priv->list);
return priv;
}
return NULL;
}
static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv;
spin_lock_irqsave(&sdev->priv_lock, flags);
priv = stub_priv_pop_from_listhead(&sdev->priv_init);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
priv = stub_priv_pop_from_listhead(&sdev->priv_free);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
void stub_device_cleanup_urbs(struct stub_device *sdev)
{
struct stub_priv *priv;
udbg("free sdev %p\n", sdev);
while ((priv = stub_priv_pop(sdev))) {
struct urb *urb = priv->urb;
udbg(" free urb %p\n", urb);
usb_kill_urb(urb);
kmem_cache_free(stub_priv_cache, priv);
if (urb->transfer_buffer != NULL)
kfree(urb->transfer_buffer);
if (urb->setup_packet != NULL)
kfree(urb->setup_packet);
usb_free_urb(urb);
}
}
/*-------------------------------------------------------------------------*/
static int __init usb_stub_init(void)
{
int ret;
stub_priv_cache = kmem_cache_create("stub_priv",
sizeof(struct stub_priv), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!stub_priv_cache) {
printk(KERN_ERR KBUILD_MODNAME
": create stub_priv_cache error\n");
return -ENOMEM;
}
ret = usb_register(&stub_driver);
if (ret) {
printk(KERN_ERR KBUILD_MODNAME ": usb_register failed %d\n",
ret);
goto error_usb_register;
}
printk(KERN_INFO KBUILD_MODNAME ":"
DRIVER_DESC ":" DRIVER_VERSION "\n");
memset(busid_table, 0, sizeof(busid_table));
spin_lock_init(&busid_table_lock);
ret = driver_create_file(&stub_driver.drvwrap.driver,
&driver_attr_match_busid);
if (ret) {
printk(KERN_ERR KBUILD_MODNAME ": create driver sysfs\n");
goto error_create_file;
}
return ret;
error_create_file:
usb_deregister(&stub_driver);
error_usb_register:
kmem_cache_destroy(stub_priv_cache);
return ret;
}
static void __exit usb_stub_exit(void)
{
driver_remove_file(&stub_driver.drvwrap.driver,
&driver_attr_match_busid);
/*
* deregister() calls stub_disconnect() for all devices. Device
* specific data is cleared in stub_disconnect().
*/
usb_deregister(&stub_driver);
kmem_cache_destroy(stub_priv_cache);
}
module_init(usb_stub_init);
module_exit(usb_stub_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

615
drivers/staging/usbip/stub_rx.c Normal file
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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
#include "stub.h"
#include "../../usb/core/hcd.h"
static int is_clear_halt_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
req = (struct usb_ctrlrequest *) urb->setup_packet;
return (req->bRequest == USB_REQ_CLEAR_FEATURE) &&
(req->bRequestType == USB_RECIP_ENDPOINT) &&
(req->wValue == USB_ENDPOINT_HALT);
}
static int is_set_interface_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
req = (struct usb_ctrlrequest *) urb->setup_packet;
return (req->bRequest == USB_REQ_SET_INTERFACE) &&
(req->bRequestType == USB_RECIP_INTERFACE);
}
static int is_set_configuration_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
req = (struct usb_ctrlrequest *) urb->setup_packet;
return (req->bRequest == USB_REQ_SET_CONFIGURATION) &&
(req->bRequestType == USB_RECIP_DEVICE);
}
static int is_reset_device_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
__u16 value;
__u16 index;
req = (struct usb_ctrlrequest *) urb->setup_packet;
value = le16_to_cpu(req->wValue);
index = le16_to_cpu(req->wIndex);
if ((req->bRequest == USB_REQ_SET_FEATURE) &&
(req->bRequestType == USB_RT_PORT) &&
(value = USB_PORT_FEAT_RESET)) {
dbg_stub_rx("reset_device_cmd, port %u\n", index);
return 1;
} else
return 0;
}
static int tweak_clear_halt_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
int target_endp;
int target_dir;
int target_pipe;
int ret;
req = (struct usb_ctrlrequest *) urb->setup_packet;
/*
* The stalled endpoint is specified in the wIndex value. The endpoint
* of the urb is the target of this clear_halt request (i.e., control
* endpoint).
*/
target_endp = le16_to_cpu(req->wIndex) & 0x000f;
/* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80. */
target_dir = le16_to_cpu(req->wIndex) & 0x0080;
if (target_dir)
target_pipe = usb_rcvctrlpipe(urb->dev, target_endp);
else
target_pipe = usb_sndctrlpipe(urb->dev, target_endp);
ret = usb_clear_halt(urb->dev, target_pipe);
if (ret < 0)
uinfo("clear_halt error: devnum %d endp %d, %d\n",
urb->dev->devnum, target_endp, ret);
else
uinfo("clear_halt done: devnum %d endp %d\n",
urb->dev->devnum, target_endp);
return ret;
}
static int tweak_set_interface_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
__u16 alternate;
__u16 interface;
int ret;
req = (struct usb_ctrlrequest *) urb->setup_packet;
alternate = le16_to_cpu(req->wValue);
interface = le16_to_cpu(req->wIndex);
dbg_stub_rx("set_interface: inf %u alt %u\n", interface, alternate);
ret = usb_set_interface(urb->dev, interface, alternate);
if (ret < 0)
uinfo("set_interface error: inf %u alt %u, %d\n",
interface, alternate, ret);
else
uinfo("set_interface done: inf %u alt %u\n",
interface,
alternate);
return ret;
}
static int tweak_set_configuration_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
__u16 config;
req = (struct usb_ctrlrequest *) urb->setup_packet;
config = le16_to_cpu(req->wValue);
/*
* I have never seen a multi-config device. Very rare.
* For most devices, this will be called to choose a default
* configuration only once in an initialization phase.
*
* set_configuration may change a device configuration and its device
* drivers will be unbound and assigned for a new device configuration.
* This means this usbip driver will be also unbound when called, then
* eventually reassigned to the device as far as driver matching
* condition is kept.
*
* Unfortunatelly, an existing usbip connection will be dropped
* due to this driver unbinding. So, skip here.
* A user may need to set a special configuration value before
* exporting the device.
*/
uinfo("set_configuration (%d) to %s\n", config, urb->dev->dev.bus_id);
uinfo("but, skip!\n");
return 0;
/* return usb_driver_set_configuration(urb->dev, config); */
}
static int tweak_reset_device_cmd(struct urb *urb)
{
struct usb_ctrlrequest *req;
__u16 value;
__u16 index;
int ret;
req = (struct usb_ctrlrequest *) urb->setup_packet;
value = le16_to_cpu(req->wValue);
index = le16_to_cpu(req->wIndex);
uinfo("reset_device (port %d) to %s\n", index, urb->dev->dev.bus_id);
/* all interfaces should be owned by usbip driver, so just reset it. */
ret = usb_lock_device_for_reset(urb->dev, NULL);
if (ret < 0) {
dev_err(&urb->dev->dev, "lock for reset\n");
return ret;
}
/* try to reset the device */
ret = usb_reset_device(urb->dev);
if (ret < 0)
dev_err(&urb->dev->dev, "device reset\n");
usb_unlock_device(urb->dev);
return ret;
}
/*
* clear_halt, set_interface, and set_configuration require special tricks.
*/
static void tweak_special_requests(struct urb *urb)
{
if (!urb || !urb->setup_packet)
return;
if (usb_pipetype(urb->pipe) != PIPE_CONTROL)
return;
if (is_clear_halt_cmd(urb))
/* tweak clear_halt */
tweak_clear_halt_cmd(urb);
else if (is_set_interface_cmd(urb))
/* tweak set_interface */
tweak_set_interface_cmd(urb);
else if (is_set_configuration_cmd(urb))
/* tweak set_configuration */
tweak_set_configuration_cmd(urb);
else if (is_reset_device_cmd(urb))
tweak_reset_device_cmd(urb);
else
dbg_stub_rx("no need to tweak\n");
}
/*
* stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb().
* By unlinking the urb asynchronously, stub_rx can continuously
* process coming urbs. Even if the urb is unlinked, its completion
* handler will be called and stub_tx will send a return pdu.
*
* See also comments about unlinking strategy in vhci_hcd.c.
*/
static int stub_recv_cmd_unlink(struct stub_device *sdev,
struct usbip_header *pdu)
{
struct list_head *listhead = &sdev->priv_init;
struct list_head *ptr;
unsigned long flags;
struct stub_priv *priv;
spin_lock_irqsave(&sdev->priv_lock, flags);
for (ptr = listhead->next; ptr != listhead; ptr = ptr->next) {
priv = list_entry(ptr, struct stub_priv, list);
if (priv->seqnum == pdu->u.cmd_unlink.seqnum) {
int ret;
dev_info(&priv->urb->dev->dev, "unlink urb %p\n",
priv->urb);
/*
* This matched urb is not completed yet (i.e., be in
* flight in usb hcd hardware/driver). Now we are
* cancelling it. The unlinking flag means that we are
* now not going to return the normal result pdu of a
* submission request, but going to return a result pdu
* of the unlink request.
*/
priv->unlinking = 1;
/*
* In the case that unlinking flag is on, prev->seqnum
* is changed from the seqnum of the cancelling urb to
* the seqnum of the unlink request. This will be used
* to make the result pdu of the unlink request.
*/
priv->seqnum = pdu->base.seqnum;
spin_unlock_irqrestore(&sdev->priv_lock, flags);
/*
* usb_unlink_urb() is now out of spinlocking to avoid
* spinlock recursion since stub_complete() is
* sometimes called in this context but not in the
* interrupt context. If stub_complete() is executed
* before we call usb_unlink_urb(), usb_unlink_urb()
* will return an error value. In this case, stub_tx
* will return the result pdu of this unlink request
* though submission is completed and actual unlinking
* is not executed. OK?
*/
/* In the above case, urb->status is not -ECONNRESET,
* so a driver in a client host will know the failure
* of the unlink request ?
*/
ret = usb_unlink_urb(priv->urb);
if (ret != -EINPROGRESS)
dev_err(&priv->urb->dev->dev,
"failed to unlink a urb %p, ret %d\n",
priv->urb, ret);
return 0;
}
}
dbg_stub_rx("seqnum %d is not pending\n", pdu->u.cmd_unlink.seqnum);
/*
* The urb of the unlink target is not found in priv_init queue. It was
* already completed and its results is/was going to be sent by a
* CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only
* return the completeness of this unlink request to vhci_hcd.
*/
stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return 0;
}
static int valid_request(struct stub_device *sdev, struct usbip_header *pdu)
{
struct usbip_device *ud = &sdev->ud;
if (pdu->base.devid == sdev->devid) {
spin_lock(&ud->lock);
if (ud->status == SDEV_ST_USED) {
/* A request is valid. */
spin_unlock(&ud->lock);
return 1;
}
spin_unlock(&ud->lock);
}
return 0;
}
static struct stub_priv *stub_priv_alloc(struct stub_device *sdev,
struct usbip_header *pdu)
{
struct stub_priv *priv;
struct usbip_device *ud = &sdev->ud;
unsigned long flags;
spin_lock_irqsave(&sdev->priv_lock, flags);
priv = kmem_cache_alloc(stub_priv_cache, GFP_ATOMIC);
if (!priv) {
dev_err(&sdev->interface->dev, "alloc stub_priv\n");
spin_unlock_irqrestore(&sdev->priv_lock, flags);
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
return NULL;
}
memset(priv, 0, sizeof(struct stub_priv));
priv->seqnum = pdu->base.seqnum;
priv->sdev = sdev;
/*
* After a stub_priv is linked to a list_head,
* our error handler can free allocated data.
*/
list_add_tail(&priv->list, &sdev->priv_init);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
static struct usb_host_endpoint *get_ep_from_epnum(struct usb_device *udev,
int epnum0)
{
struct usb_host_config *config;
int i = 0, j = 0;
struct usb_host_endpoint *ep = NULL;
int epnum;
int found = 0;
if (epnum0 == 0)
return &udev->ep0;
config = udev->actconfig;
if (!config)
return NULL;
for (i = 0; i < config->desc.bNumInterfaces; i++) {
struct usb_host_interface *setting;
setting = config->interface[i]->cur_altsetting;
for (j = 0; j < setting->desc.bNumEndpoints; j++) {
ep = &setting->endpoint[j];
epnum = (ep->desc.bEndpointAddress & 0x7f);
if (epnum == epnum0) {
/* uinfo("found epnum %d\n", epnum0); */
found = 1;
break;
}
}
}
if (found)
return ep;
else
return NULL;
}
static int get_pipe(struct stub_device *sdev, int epnum, int dir)
{
struct usb_device *udev = interface_to_usbdev(sdev->interface);
struct usb_host_endpoint *ep;
struct usb_endpoint_descriptor *epd = NULL;
ep = get_ep_from_epnum(udev, epnum);
if (!ep) {
dev_err(&sdev->interface->dev, "no such endpoint?, %d\n",
epnum);
BUG();
}
epd = &ep->desc;
#if 0
/* epnum 0 is always control */
if (epnum == 0) {
if (dir == USBIP_DIR_OUT)
return usb_sndctrlpipe(udev, 0);
else
return usb_rcvctrlpipe(udev, 0);
}
#endif
if (usb_endpoint_xfer_control(epd)) {
if (dir == USBIP_DIR_OUT)
return usb_sndctrlpipe(udev, epnum);
else
return usb_rcvctrlpipe(udev, epnum);
}
if (usb_endpoint_xfer_bulk(epd)) {
if (dir == USBIP_DIR_OUT)
return usb_sndbulkpipe(udev, epnum);
else
return usb_rcvbulkpipe(udev, epnum);
}
if (usb_endpoint_xfer_int(epd)) {
if (dir == USBIP_DIR_OUT)
return usb_sndintpipe(udev, epnum);
else
return usb_rcvintpipe(udev, epnum);
}
if (usb_endpoint_xfer_isoc(epd)) {
if (dir == USBIP_DIR_OUT)
return usb_sndisocpipe(udev, epnum);
else
return usb_rcvisocpipe(udev, epnum);
}
/* NOT REACHED */
dev_err(&sdev->interface->dev, "get pipe, epnum %d\n", epnum);
return 0;
}
static void stub_recv_cmd_submit(struct stub_device *sdev,
struct usbip_header *pdu)
{
int ret;
struct stub_priv *priv;
struct usbip_device *ud = &sdev->ud;
struct usb_device *udev = interface_to_usbdev(sdev->interface);
int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction);
priv = stub_priv_alloc(sdev, pdu);
if (!priv)
return;
/* setup a urb */
if (usb_pipeisoc(pipe))
priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
GFP_KERNEL);
else
priv->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!priv->urb) {
dev_err(&sdev->interface->dev, "malloc urb\n");
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
return;
}
/* set priv->urb->transfer_buffer */
if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
priv->urb->transfer_buffer =
kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
GFP_KERNEL);
if (!priv->urb->transfer_buffer) {
dev_err(&sdev->interface->dev, "malloc x_buff\n");
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
return;
}
}
/* set priv->urb->setup_packet */
priv->urb->setup_packet = kzalloc(8, GFP_KERNEL);
if (!priv->urb->setup_packet) {
dev_err(&sdev->interface->dev, "allocate setup_packet\n");
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
return;
}
memcpy(priv->urb->setup_packet, &pdu->u.cmd_submit.setup, 8);
/* set other members from the base header of pdu */
priv->urb->context = (void *) priv;
priv->urb->dev = udev;
priv->urb->pipe = pipe;
priv->urb->complete = stub_complete;
usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0);
if (usbip_recv_xbuff(ud, priv->urb) < 0)
return;
if (usbip_recv_iso(ud, priv->urb) < 0)
return;
/* no need to submit an intercepted request, but harmless? */
tweak_special_requests(priv->urb);
/* urb is now ready to submit */
ret = usb_submit_urb(priv->urb, GFP_KERNEL);
if (ret == 0)
dbg_stub_rx("submit urb ok, seqnum %u\n", pdu->base.seqnum);
else {
dev_err(&sdev->interface->dev, "submit_urb error, %d\n", ret);
usbip_dump_header(pdu);
usbip_dump_urb(priv->urb);
/*
* Pessimistic.
* This connection will be discarded.
*/
usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
}
dbg_stub_rx("Leave\n");
return;
}
/* recv a pdu */
static void stub_rx_pdu(struct usbip_device *ud)
{
int ret;
struct usbip_header pdu;
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
struct device *dev = &sdev->interface->dev;
dbg_stub_rx("Enter\n");
memset(&pdu, 0, sizeof(pdu));
/* 1. receive a pdu header */
ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
if (ret != sizeof(pdu)) {
dev_err(dev, "recv a header, %d\n", ret);
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
return;
}
usbip_header_correct_endian(&pdu, 0);
if (dbg_flag_stub_rx)
usbip_dump_header(&pdu);
if (!valid_request(sdev, &pdu)) {
dev_err(dev, "recv invalid request\n");
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
return;
}
switch (pdu.base.command) {
case USBIP_CMD_UNLINK:
stub_recv_cmd_unlink(sdev, &pdu);
break;
case USBIP_CMD_SUBMIT:
stub_recv_cmd_submit(sdev, &pdu);
break;
default:
/* NOTREACHED */
dev_err(dev, "unknown pdu\n");
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
return;
}
}
void stub_rx_loop(struct usbip_task *ut)
{
struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);
while (1) {
if (signal_pending(current)) {
dbg_stub_rx("signal caught!\n");
break;
}
if (usbip_event_happend(ud))
break;
stub_rx_pdu(ud);
}
}

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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
#include "stub.h"
static void stub_free_priv_and_urb(struct stub_priv *priv)
{
struct urb *urb = priv->urb;
kfree(urb->setup_packet);
kfree(urb->transfer_buffer);
list_del(&priv->list);
kmem_cache_free(stub_priv_cache, priv);
usb_free_urb(urb);
}
/* be in spin_lock_irqsave(&sdev->priv_lock, flags) */
void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
__u32 status)
{
struct stub_unlink *unlink;
unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC);
if (!unlink) {
dev_err(&sdev->interface->dev, "alloc stub_unlink\n");
usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC);
return;
}
unlink->seqnum = seqnum;
unlink->status = status;
list_add_tail(&unlink->list, &sdev->unlink_tx);
}
/**
* stub_complete - completion handler of a usbip urb
* @urb: pointer to the urb completed
* @regs:
*
* When a urb has completed, the USB core driver calls this function mostly in
* the interrupt context. To return the result of a urb, the completed urb is
* linked to the pending list of returning.
*
*/
void stub_complete(struct urb *urb)
{
struct stub_priv *priv = (struct stub_priv *) urb->context;
struct stub_device *sdev = priv->sdev;
unsigned long flags;
dbg_stub_tx("complete! status %d\n", urb->status);
switch (urb->status) {
case 0:
/* OK */
break;
case -ENOENT:
uinfo("stopped by a call of usb_kill_urb() because of"
"cleaning up a virtual connection\n");
return;
case -ECONNRESET:
uinfo("unlinked by a call of usb_unlink_urb()\n");
break;
case -EPIPE:
uinfo("endpoint %d is stalled\n", usb_pipeendpoint(urb->pipe));
break;
case -ESHUTDOWN:
uinfo("device removed?\n");
break;
default:
uinfo("urb completion with non-zero status %d\n", urb->status);
}
/* link a urb to the queue of tx. */
spin_lock_irqsave(&sdev->priv_lock, flags);
if (priv->unlinking) {
stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status);
stub_free_priv_and_urb(priv);
} else
list_move_tail(&priv->list, &sdev->priv_tx);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
/* wake up tx_thread */
wake_up(&sdev->tx_waitq);
}
/*-------------------------------------------------------------------------*/
/* fill PDU */
static inline void setup_base_pdu(struct usbip_header_basic *base,
__u32 command, __u32 seqnum)
{
base->command = command;
base->seqnum = seqnum;
base->devid = 0;
base->ep = 0;
base->direction = 0;
}
static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb)
{
struct stub_priv *priv = (struct stub_priv *) urb->context;
setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum);
usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1);
}
static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
struct stub_unlink *unlink)
{
setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
rpdu->u.ret_unlink.status = unlink->status;
}
/*-------------------------------------------------------------------------*/
/* send RET_SUBMIT */
static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv, *tmp;
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) {
list_move_tail(&priv->list, &sdev->priv_free);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
static int stub_send_ret_submit(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv, *tmp;
struct msghdr msg;
struct kvec iov[3];
size_t txsize;
size_t total_size = 0;
while ((priv = dequeue_from_priv_tx(sdev)) != NULL) {
int ret;
struct urb *urb = priv->urb;
struct usbip_header pdu_header;
void *iso_buffer = NULL;
txsize = 0;
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
memset(&iov, 0, sizeof(iov));
dbg_stub_tx("setup txdata urb %p\n", urb);
/* 1. setup usbip_header */
setup_ret_submit_pdu(&pdu_header, urb);
usbip_header_correct_endian(&pdu_header, 1);
iov[0].iov_base = &pdu_header;
iov[0].iov_len = sizeof(pdu_header);
txsize += sizeof(pdu_header);
/* 2. setup transfer buffer */
if (usb_pipein(urb->pipe) && urb->actual_length > 0) {
iov[1].iov_base = urb->transfer_buffer;
iov[1].iov_len = urb->actual_length;
txsize += urb->actual_length;
}
/* 3. setup iso_packet_descriptor */
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
ssize_t len = 0;
iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
if (!iso_buffer) {
usbip_event_add(&sdev->ud,
SDEV_EVENT_ERROR_MALLOC);
return -1;
}
iov[2].iov_base = iso_buffer;
iov[2].iov_len = len;
txsize += len;
}
ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
3, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
ret, txsize);
kfree(iso_buffer);
usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
return -1;
}
kfree(iso_buffer);
dbg_stub_tx("send txdata\n");
total_size += txsize;
}
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) {
stub_free_priv_and_urb(priv);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return total_size;
}
/*-------------------------------------------------------------------------*/
/* send RET_UNLINK */
static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev)
{
unsigned long flags;
struct stub_unlink *unlink, *tmp;
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
list_move_tail(&unlink->list, &sdev->unlink_free);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return unlink;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
static int stub_send_ret_unlink(struct stub_device *sdev)
{
unsigned long flags;
struct stub_unlink *unlink, *tmp;
struct msghdr msg;
struct kvec iov[1];
size_t txsize;
size_t total_size = 0;
while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) {
int ret;
struct usbip_header pdu_header;
txsize = 0;
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
memset(&iov, 0, sizeof(iov));
dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum);
/* 1. setup usbip_header */
setup_ret_unlink_pdu(&pdu_header, unlink);
usbip_header_correct_endian(&pdu_header, 1);
iov[0].iov_base = &pdu_header;
iov[0].iov_len = sizeof(pdu_header);
txsize += sizeof(pdu_header);
ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
1, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
ret, txsize);
usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
return -1;
}
dbg_stub_tx("send txdata\n");
total_size += txsize;
}
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) {
list_del(&unlink->list);
kfree(unlink);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return total_size;
}
/*-------------------------------------------------------------------------*/
void stub_tx_loop(struct usbip_task *ut)
{
struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_tx);
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
while (1) {
if (signal_pending(current)) {
dbg_stub_tx("signal catched\n");
break;
}
if (usbip_event_happend(ud))
break;
/*
* send_ret_submit comes earlier than send_ret_unlink. stub_rx
* looks at only priv_init queue. If the completion of a URB is
* earlier than the receive of CMD_UNLINK, priv is moved to
* priv_tx queue and stub_rx does not find the target priv. In
* this case, vhci_rx receives the result of the submit request
* and then receives the result of the unlink request. The
* result of the submit is given back to the usbcore as the
* completion of the unlink request. The request of the
* unlink is ignored. This is ok because a driver who calls
* usb_unlink_urb() understands the unlink was too late by
* getting the status of the given-backed URB which has the
* status of usb_submit_urb().
*/
if (stub_send_ret_submit(sdev) < 0)
break;
if (stub_send_ret_unlink(sdev) < 0)
break;
wait_event_interruptible(sdev->tx_waitq,
(!list_empty(&sdev->priv_tx) ||
!list_empty(&sdev->unlink_tx)));
}
}