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    Subject[patch 03/03] USB: USB/IP: add host driver
    From: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>

    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>

    ---
    drivers/usb/ip/Kconfig | 10
    drivers/usb/ip/Makefile | 3
    drivers/usb/ip/stub.h | 95 ++++++
    drivers/usb/ip/stub_dev.c | 483 +++++++++++++++++++++++++++++++++++
    drivers/usb/ip/stub_main.c | 300 +++++++++++++++++++++
    drivers/usb/ip/stub_rx.c | 616 +++++++++++++++++++++++++++++++++++++++++++++
    drivers/usb/ip/stub_tx.c | 371 +++++++++++++++++++++++++++
    7 files changed, 1878 insertions(+)
    --- a/drivers/usb/ip/Kconfig
    +++ b/drivers/usb/ip/Kconfig
    @@ -22,3 +22,13 @@ 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
    + ---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.
    --- a/drivers/usb/ip/Makefile
    +++ b/drivers/usb/ip/Makefile
    @@ -4,6 +4,9 @@ usbip_common_mod-objs := usbip_common.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
    --- /dev/null
    +++ b/drivers/usb/ip/stub_dev.c
    @@ -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");
    +}
    --- /dev/null
    +++ b/drivers/usb/ip/stub.h
    @@ -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);
    --- /dev/null
    +++ b/drivers/usb/ip/stub_main.c
    @@ -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");
    --- /dev/null
    +++ b/drivers/usb/ip/stub_rx.c
    @@ -0,0 +1,616 @@
    +/*
    + * 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 HCD_HEADER
    +
    +
    +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);
    + }
    +}
    --- /dev/null
    +++ b/drivers/usb/ip/stub_tx.c
    @@ -0,0 +1,371 @@
    +/*
    + * 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)));
    + }
    +}
    --


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