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    Subject[patch 01/03] USB: USB/IP: add common functions needed
    From: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>

    This adds the common functions needed by both the host and client side
    of the USB/IP code.

    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/Kconfig | 2
    drivers/usb/Makefile | 2
    drivers/usb/ip/Kconfig | 14
    drivers/usb/ip/Makefile | 6
    drivers/usb/ip/usbip_common.c | 997 ++++++++++++++++++++++++++++++++++++++++++
    drivers/usb/ip/usbip_common.h | 406 +++++++++++++++++
    drivers/usb/ip/usbip_event.c | 141 +++++
    7 files changed, 1568 insertions(+)

    --- /dev/null
    +++ b/drivers/usb/ip/Kconfig
    @@ -0,0 +1,14 @@
    +config USB_IP_COMMON
    + tristate "USB IP support (EXPERIMENTAL)"
    + depends on USB && EXPERIMENTAL
    + default N
    + ---help---
    + This enables pushing USB packets over IP to allow remote
    + machines access to USB devices directly. For more details,
    + and links to the userspace utility programs to let this work
    + properly, see http://usbip.naist.jp/
    +
    + To compile this driver as a module, choose M here: the
    + module will be called usbip_common_mod.
    +
    + If unsure, say N.
    --- /dev/null
    +++ b/drivers/usb/ip/Makefile
    @@ -0,0 +1,6 @@
    +obj-$(CONFIG_USB_IP_COMMON) += usbip_common_mod.o
    +usbip_common_mod-objs := usbip_common.o usbip_event.o
    +
    +ifeq ($(CONFIG_USB_DEBUG),y)
    + EXTRA_CFLAGS += -DDEBUG
    +endif
    --- /dev/null
    +++ b/drivers/usb/ip/usbip_common.c
    @@ -0,0 +1,997 @@
    +/*
    + * 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/file.h>
    +#include <linux/tcp.h>
    +#include <linux/in.h>
    +#include "usbip_common.h"
    +
    +/* version information */
    +#define DRIVER_VERSION "1.0"
    +#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
    +#define DRIVER_DESC "usbip common driver"
    +
    +/*-------------------------------------------------------------------------*/
    +/* debug routines */
    +
    +#ifdef CONFIG_USB_DEBUG
    +unsigned long usbip_debug_flag = 0xffffffff;
    +#else
    +unsigned long usbip_debug_flag;
    +#endif
    +EXPORT_SYMBOL(usbip_debug_flag);
    +
    +
    +/* FIXME */
    +struct device_attribute dev_attr_usbip_debug;
    +EXPORT_SYMBOL(dev_attr_usbip_debug);
    +
    +
    +static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
    + char *buf)
    +{
    + return sprintf(buf, "%lx\n", usbip_debug_flag);
    +}
    +
    +static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned long flag;
    +
    + sscanf(buf, "%lx", &flag);
    + usbip_debug_flag = flag;
    +
    + return count;
    +}
    +DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
    +
    +static void usbip_dump_buffer(char *buff, int bufflen)
    +{
    + int i;
    +
    + if (bufflen > 128) {
    + for (i = 0; i < 128; i++) {
    + if (i%24 == 0)
    + printk(" ");
    + printk("%02x ", (unsigned char) buff[i]);
    + if (i%4 == 3)
    + printk("| ");
    + if (i%24 == 23)
    + printk("\n");
    + }
    + printk("... (%d byte)\n", bufflen);
    + return;
    + }
    +
    + for (i = 0; i < bufflen; i++) {
    + if (i%24 == 0)
    + printk(" ");
    + printk("%02x ", (unsigned char) buff[i]);
    + if (i%4 == 3)
    + printk("| ");
    + if (i%24 == 23)
    + printk("\n");
    + }
    + printk("\n");
    +
    +}
    +
    +static void usbip_dump_pipe(unsigned int p)
    +{
    + unsigned char type = usb_pipetype(p);
    + unsigned char ep = usb_pipeendpoint(p);
    + unsigned char dev = usb_pipedevice(p);
    + unsigned char dir = usb_pipein(p);
    +
    + printk("dev(%d) ", dev);
    + printk("ep(%d) ", ep);
    + printk("%s ", dir ? "IN" : "OUT");
    +
    + switch (type) {
    + case PIPE_ISOCHRONOUS:
    + printk("%s ", "ISO");
    + break;
    + case PIPE_INTERRUPT:
    + printk("%s ", "INT");
    + break;
    + case PIPE_CONTROL:
    + printk("%s ", "CTL");
    + break;
    + case PIPE_BULK:
    + printk("%s ", "BLK");
    + break;
    + default:
    + printk("ERR");
    + }
    +
    + printk("\n");
    +
    +}
    +
    +static void usbip_dump_usb_device(struct usb_device *udev)
    +{
    + struct device *dev = &udev->dev;
    + int i;
    +
    + dev_dbg(dev, " devnum(%d) devpath(%s)",
    + udev->devnum, udev->devpath);
    +
    + switch (udev->speed) {
    + case USB_SPEED_HIGH:
    + printk(" SPD_HIGH");
    + break;
    + case USB_SPEED_FULL:
    + printk(" SPD_FULL");
    + break;
    + case USB_SPEED_LOW:
    + printk(" SPD_LOW");
    + break;
    + case USB_SPEED_UNKNOWN:
    + printk(" SPD_UNKNOWN");
    + break;
    + default:
    + printk(" SPD_ERROR");
    + }
    +
    + printk(" tt %p, ttport %d", udev->tt, udev->ttport);
    + printk("\n");
    +
    + dev_dbg(dev, " ");
    + for (i = 0; i < 16; i++)
    + printk(" %2u", i);
    + printk("\n");
    +
    + dev_dbg(dev, " toggle0(IN) :");
    + for (i = 0; i < 16; i++)
    + printk(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
    + printk("\n");
    +
    + dev_dbg(dev, " toggle1(OUT):");
    + for (i = 0; i < 16; i++)
    + printk(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
    + printk("\n");
    +
    +
    + dev_dbg(dev, " epmaxp_in :");
    + for (i = 0; i < 16; i++) {
    + if (udev->ep_in[i])
    + printk(" %2u",
    + le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
    + }
    + printk("\n");
    +
    + dev_dbg(dev, " epmaxp_out :");
    + for (i = 0; i < 16; i++) {
    + if (udev->ep_out[i])
    + printk(" %2u",
    + le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
    + }
    + printk("\n");
    +
    + dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
    +
    + dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
    + "rawdescriptors %p\n", &udev->descriptor, udev->config,
    + udev->actconfig, udev->rawdescriptors);
    +
    + dev_dbg(dev, "have_langid %d, string_langid %d\n",
    + udev->have_langid, udev->string_langid);
    +
    + dev_dbg(dev, "maxchild %d, children %p\n",
    + udev->maxchild, udev->children);
    +}
    +
    +static void usbip_dump_request_type(__u8 rt)
    +{
    + switch (rt & USB_RECIP_MASK) {
    + case USB_RECIP_DEVICE:
    + printk("DEVICE");
    + break;
    + case USB_RECIP_INTERFACE:
    + printk("INTERF");
    + break;
    + case USB_RECIP_ENDPOINT:
    + printk("ENDPOI");
    + break;
    + case USB_RECIP_OTHER:
    + printk("OTHER ");
    + break;
    + default:
    + printk("------");
    + }
    +}
    +
    +static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
    +{
    + if (!cmd) {
    + printk(" %s : null pointer\n", __FUNCTION__);
    + return;
    + }
    +
    + printk(" ");
    + printk("bRequestType(%02X) ", cmd->bRequestType);
    + printk("bRequest(%02X) " , cmd->bRequest);
    + printk("wValue(%04X) ", cmd->wValue);
    + printk("wIndex(%04X) ", cmd->wIndex);
    + printk("wLength(%04X) ", cmd->wLength);
    +
    + printk("\n ");
    +
    + if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
    + printk("STANDARD ");
    + switch (cmd->bRequest) {
    + case USB_REQ_GET_STATUS:
    + printk("GET_STATUS");
    + break;
    + case USB_REQ_CLEAR_FEATURE:
    + printk("CLEAR_FEAT");
    + break;
    + case USB_REQ_SET_FEATURE:
    + printk("SET_FEAT ");
    + break;
    + case USB_REQ_SET_ADDRESS:
    + printk("SET_ADDRRS");
    + break;
    + case USB_REQ_GET_DESCRIPTOR:
    + printk("GET_DESCRI");
    + break;
    + case USB_REQ_SET_DESCRIPTOR:
    + printk("SET_DESCRI");
    + break;
    + case USB_REQ_GET_CONFIGURATION:
    + printk("GET_CONFIG");
    + break;
    + case USB_REQ_SET_CONFIGURATION:
    + printk("SET_CONFIG");
    + break;
    + case USB_REQ_GET_INTERFACE:
    + printk("GET_INTERF");
    + break;
    + case USB_REQ_SET_INTERFACE:
    + printk("SET_INTERF");
    + break;
    + case USB_REQ_SYNCH_FRAME:
    + printk("SYNC_FRAME");
    + break;
    + default:
    + printk("REQ(%02X) ", cmd->bRequest);
    + }
    +
    + printk(" ");
    + usbip_dump_request_type(cmd->bRequestType);
    +
    + } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
    + printk("CLASS ");
    +
    + else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
    + printk("VENDOR ");
    +
    + else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
    + printk("RESERVED");
    +
    + printk("\n");
    +}
    +
    +void usbip_dump_urb(struct urb *urb)
    +{
    + struct device *dev;
    +
    + if (!urb) {
    + printk(KERN_DEBUG KBUILD_MODNAME
    + ":%s: urb: null pointer!!\n", __func__);
    + return;
    + }
    +
    + if (!urb->dev) {
    + printk(KERN_DEBUG KBUILD_MODNAME
    + ":%s: urb->dev: null pointer!!\n", __func__);
    + return;
    + }
    + dev = &urb->dev->dev;
    +
    + dev_dbg(dev, " urb :%p\n", urb);
    + dev_dbg(dev, " dev :%p\n", urb->dev);
    +
    + usbip_dump_usb_device(urb->dev);
    +
    + dev_dbg(dev, " pipe :%08x ", urb->pipe);
    +
    + usbip_dump_pipe(urb->pipe);
    +
    + dev_dbg(dev, " status :%d\n", urb->status);
    + dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
    + dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
    + dev_dbg(dev, " transfer_buffer_length:%d\n", urb->transfer_buffer_length);
    + dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
    + dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
    +
    + if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
    + usbip_dump_usb_ctrlrequest(
    + (struct usb_ctrlrequest *)urb->setup_packet);
    +
    + dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
    + dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
    + dev_dbg(dev, " interval :%d\n", urb->interval);
    + dev_dbg(dev, " error_count :%d\n", urb->error_count);
    + dev_dbg(dev, " context :%p\n", urb->context);
    + dev_dbg(dev, " complete :%p\n", urb->complete);
    +}
    +EXPORT_SYMBOL(usbip_dump_urb);
    +
    +void usbip_dump_header(struct usbip_header *pdu)
    +{
    + udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
    + pdu->base.command,
    + pdu->base.seqnum,
    + pdu->base.devid,
    + pdu->base.direction,
    + pdu->base.ep);
    +
    + switch (pdu->base.command) {
    + case USBIP_CMD_SUBMIT:
    + udbg("CMD_SUBMIT: x_flags %u x_len %u sf %u #p %u iv %u\n",
    + pdu->u.cmd_submit.transfer_flags,
    + pdu->u.cmd_submit.transfer_buffer_length,
    + pdu->u.cmd_submit.start_frame,
    + pdu->u.cmd_submit.number_of_packets,
    + pdu->u.cmd_submit.interval);
    + break;
    + case USBIP_CMD_UNLINK:
    + udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
    + break;
    + case USBIP_RET_SUBMIT:
    + udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
    + pdu->u.ret_submit.status,
    + pdu->u.ret_submit.actual_length,
    + pdu->u.ret_submit.start_frame,
    + pdu->u.ret_submit.error_count);
    + case USBIP_RET_UNLINK:
    + udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
    + break;
    + default:
    + /* NOT REACHED */
    + udbg("UNKNOWN\n");
    + }
    +}
    +EXPORT_SYMBOL(usbip_dump_header);
    +
    +
    +/*-------------------------------------------------------------------------*/
    +/* thread routines */
    +
    +int usbip_thread(void *param)
    +{
    + struct usbip_task *ut = param;
    +
    + if (!ut)
    + return -EINVAL;
    +
    + lock_kernel();
    + daemonize(ut->name);
    + allow_signal(SIGKILL);
    + ut->thread = current;
    + unlock_kernel();
    +
    + /* srv.rb must wait for rx_thread starting */
    + complete(&ut->thread_done);
    +
    + /* start of while loop */
    + ut->loop_ops(ut);
    +
    + /* end of loop */
    + ut->thread = NULL;
    +
    + complete_and_exit(&ut->thread_done, 0);
    +}
    +
    +void usbip_start_threads(struct usbip_device *ud)
    +{
    + /*
    + * threads are invoked per one device (per one connection).
    + */
    + kernel_thread(usbip_thread, (void *)&ud->tcp_rx, 0);
    + kernel_thread(usbip_thread, (void *)&ud->tcp_tx, 0);
    +
    + /* confirm threads are starting */
    + wait_for_completion(&ud->tcp_rx.thread_done);
    + wait_for_completion(&ud->tcp_tx.thread_done);
    +}
    +EXPORT_SYMBOL(usbip_start_threads);
    +
    +void usbip_stop_threads(struct usbip_device *ud)
    +{
    + /* kill threads related to this sdev, if v.c. exists */
    + if (ud->tcp_rx.thread != NULL) {
    + send_sig(SIGKILL, ud->tcp_rx.thread, 1);
    + wait_for_completion(&ud->tcp_rx.thread_done);
    + udbg("rx_thread for ud %p has finished\n", ud);
    + }
    +
    + if (ud->tcp_tx.thread != NULL) {
    + send_sig(SIGKILL, ud->tcp_tx.thread, 1);
    + wait_for_completion(&ud->tcp_tx.thread_done);
    + udbg("tx_thread for ud %p has finished\n", ud);
    + }
    +}
    +EXPORT_SYMBOL(usbip_stop_threads);
    +
    +void usbip_task_init(struct usbip_task *ut, char *name,
    + void (*loop_ops)(struct usbip_task *))
    +{
    + ut->thread = NULL;
    + init_completion(&ut->thread_done);
    + ut->name = name;
    + ut->loop_ops = loop_ops;
    +}
    +EXPORT_SYMBOL(usbip_task_init);
    +
    +
    +/*-------------------------------------------------------------------------*/
    +/* socket routines */
    +
    + /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
    +int usbip_xmit(int send, struct socket *sock, char *buf,
    + int size, int msg_flags)
    +{
    + int result;
    + struct msghdr msg;
    + struct kvec iov;
    + int total = 0;
    +
    + /* for blocks of if (dbg_flag_xmit) */
    + char *bp = buf;
    + int osize = size;
    +
    + dbg_xmit("enter\n");
    +
    + if (!sock || !buf || !size) {
    + printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
    + __func__, sock, buf, size);
    + return -EINVAL;
    + }
    +
    +
    + if (dbg_flag_xmit) {
    + if (send) {
    + if (!in_interrupt())
    + printk(KERN_DEBUG "%-10s:", current->comm);
    + else
    + printk(KERN_DEBUG "interupt :");
    +
    + printk("%s: sending... , sock %p, buf %p, "
    + "size %d, msg_flags %d\n", __func__,
    + sock, buf, size, msg_flags);
    + usbip_dump_buffer(buf, size);
    + }
    + }
    +
    +
    + do {
    + sock->sk->sk_allocation = GFP_NOIO;
    + iov.iov_base = buf;
    + iov.iov_len = size;
    + msg.msg_name = NULL;
    + msg.msg_namelen = 0;
    + msg.msg_control = NULL;
    + msg.msg_controllen = 0;
    + msg.msg_namelen = 0;
    + msg.msg_flags = msg_flags | MSG_NOSIGNAL;
    +
    + if (send)
    + result = kernel_sendmsg(sock, &msg, &iov, 1, size);
    + else
    + result = kernel_recvmsg(sock, &msg, &iov, 1, size,
    + MSG_WAITALL);
    +
    + if (result <= 0) {
    + udbg("usbip_xmit: %s sock %p buf %p size %u ret %d"
    + " total %d\n",
    + send ? "send" : "receive", sock, buf,
    + size, result, total);
    + goto err;
    + }
    +
    + size -= result;
    + buf += result;
    + total += result;
    +
    + } while (size > 0);
    +
    +
    + if (dbg_flag_xmit) {
    + if (!send) {
    + if (!in_interrupt())
    + printk(KERN_DEBUG "%-10s:", current->comm);
    + else
    + printk(KERN_DEBUG "interupt :");
    +
    + printk("usbip_xmit: receiving....\n");
    + usbip_dump_buffer(bp, osize);
    + printk("usbip_xmit: received, osize %d ret %d size %d "
    + "total %d\n", osize, result, size,
    + total);
    + }
    +
    + if (send)
    + printk("usbip_xmit: send, total %d\n", total);
    + }
    +
    + return total;
    +
    +err:
    + return result;
    +}
    +EXPORT_SYMBOL(usbip_xmit);
    +
    +
    +/* now a usrland utility should set options. */
    +#if 0
    +int setquickack(struct socket *socket)
    +{
    + mm_segment_t oldfs;
    + int val = 1;
    + int ret;
    +
    + oldfs = get_fs();
    + set_fs(get_ds());
    + ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_QUICKACK,
    + (char __user *) &val, sizeof(ret));
    + set_fs(oldfs);
    +
    + return ret;
    +}
    +
    +int setnodelay(struct socket *socket)
    +{
    + mm_segment_t oldfs;
    + int val = 1;
    + int ret;
    +
    + oldfs = get_fs();
    + set_fs(get_ds());
    + ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_NODELAY,
    + (char __user *) &val, sizeof(ret));
    + set_fs(oldfs);
    +
    + return ret;
    +}
    +
    +int setkeepalive(struct socket *socket)
    +{
    + mm_segment_t oldfs;
    + int val = 1;
    + int ret;
    +
    + oldfs = get_fs();
    + set_fs(get_ds());
    + ret = socket->ops->setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE,
    + (char __user *) &val, sizeof(ret));
    + set_fs(oldfs);
    +
    + return ret;
    +}
    +
    +void setreuse(struct socket *socket)
    +{
    + socket->sk->sk_reuse = 1;
    +}
    +#endif
    +
    +struct socket *sockfd_to_socket(unsigned int sockfd)
    +{
    + struct socket *socket;
    + struct file *file;
    + struct inode *inode;
    +
    + file = fget(sockfd);
    + if (!file) {
    + printk(KERN_ERR "%s: invalid sockfd\n", __func__);
    + return NULL;
    + }
    +
    + inode = file->f_dentry->d_inode;
    +
    + if (!inode || !S_ISSOCK(inode->i_mode))
    + return NULL;
    +
    + socket = SOCKET_I(inode);
    +
    + return socket;
    +}
    +EXPORT_SYMBOL(sockfd_to_socket);
    +
    +
    +
    +/*-------------------------------------------------------------------------*/
    +/* pdu routines */
    +
    +/* there may be more cases to tweak the flags. */
    +static unsigned int tweak_transfer_flags(unsigned int flags)
    +{
    +
    + if (flags & URB_NO_TRANSFER_DMA_MAP)
    + /*
    + * vhci_hcd does not provide DMA-mapped I/O. The upper
    + * driver does not need to set this flag. The remote
    + * usbip.ko does not still perform DMA-mapped I/O for
    + * DMA-caplable host controllers. So, clear this flag.
    + */
    + flags &= ~URB_NO_TRANSFER_DMA_MAP;
    +
    + if (flags & URB_NO_SETUP_DMA_MAP)
    + flags &= ~URB_NO_SETUP_DMA_MAP;
    +
    + return flags;
    +}
    +
    +static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
    + int pack)
    +{
    + struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
    +
    + /*
    + * Some members are not still implemented in usbip. I hope this issue
    + * will be discussed when usbip is ported to other operating systems.
    + */
    + if (pack) {
    + /* vhci_tx.c */
    + spdu->transfer_flags =
    + tweak_transfer_flags(urb->transfer_flags);
    + spdu->transfer_buffer_length = urb->transfer_buffer_length;
    + spdu->start_frame = urb->start_frame;
    + spdu->number_of_packets = urb->number_of_packets;
    + spdu->interval = urb->interval;
    + } else {
    + /* stub_rx.c */
    + urb->transfer_flags = spdu->transfer_flags;
    +
    + urb->transfer_buffer_length = spdu->transfer_buffer_length;
    + urb->start_frame = spdu->start_frame;
    + urb->number_of_packets = spdu->number_of_packets;
    + urb->interval = spdu->interval;
    + }
    +}
    +
    +static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
    + int pack)
    +{
    + struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
    +
    + if (pack) {
    + /* stub_tx.c */
    +
    + rpdu->status = urb->status;
    + rpdu->actual_length = urb->actual_length;
    + rpdu->start_frame = urb->start_frame;
    + rpdu->error_count = urb->error_count;
    + } else {
    + /* vhci_rx.c */
    +
    + urb->status = rpdu->status;
    + urb->actual_length = rpdu->actual_length;
    + urb->start_frame = rpdu->start_frame;
    + urb->error_count = rpdu->error_count;
    + }
    +}
    +
    +
    +void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
    + int pack)
    +{
    + switch (cmd) {
    + case USBIP_CMD_SUBMIT:
    + usbip_pack_cmd_submit(pdu, urb, pack);
    + break;
    + case USBIP_RET_SUBMIT:
    + usbip_pack_ret_submit(pdu, urb, pack);
    + break;
    + default:
    + err("unknown command");
    + /* NOTREACHED */
    + /* BUG(); */
    + }
    +}
    +EXPORT_SYMBOL(usbip_pack_pdu);
    +
    +
    +static void correct_endian_basic(struct usbip_header_basic *base, int send)
    +{
    + if (send) {
    + base->command = cpu_to_be32(base->command);
    + base->seqnum = cpu_to_be32(base->seqnum);
    + base->devid = cpu_to_be32(base->devid);
    + base->direction = cpu_to_be32(base->direction);
    + base->ep = cpu_to_be32(base->ep);
    + } else {
    + base->command = be32_to_cpu(base->command);
    + base->seqnum = be32_to_cpu(base->seqnum);
    + base->devid = be32_to_cpu(base->devid);
    + base->direction = be32_to_cpu(base->direction);
    + base->ep = be32_to_cpu(base->ep);
    + }
    +}
    +
    +static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
    + int send)
    +{
    + if (send) {
    + pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
    +
    + cpu_to_be32s(&pdu->transfer_buffer_length);
    + cpu_to_be32s(&pdu->start_frame);
    + cpu_to_be32s(&pdu->number_of_packets);
    + cpu_to_be32s(&pdu->interval);
    + } else {
    + pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
    +
    + be32_to_cpus(&pdu->transfer_buffer_length);
    + be32_to_cpus(&pdu->start_frame);
    + be32_to_cpus(&pdu->number_of_packets);
    + be32_to_cpus(&pdu->interval);
    + }
    +}
    +
    +static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
    + int send)
    +{
    + if (send) {
    + cpu_to_be32s(&pdu->status);
    + cpu_to_be32s(&pdu->actual_length);
    + cpu_to_be32s(&pdu->start_frame);
    + cpu_to_be32s(&pdu->error_count);
    + } else {
    + be32_to_cpus(&pdu->status);
    + be32_to_cpus(&pdu->actual_length);
    + be32_to_cpus(&pdu->start_frame);
    + be32_to_cpus(&pdu->error_count);
    + }
    +}
    +
    +static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
    + int send)
    +{
    + if (send)
    + pdu->seqnum = cpu_to_be32(pdu->seqnum);
    + else
    + pdu->seqnum = be32_to_cpu(pdu->seqnum);
    +}
    +
    +static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
    + int send)
    +{
    + if (send)
    + cpu_to_be32s(&pdu->status);
    + else
    + be32_to_cpus(&pdu->status);
    +}
    +
    +void usbip_header_correct_endian(struct usbip_header *pdu, int send)
    +{
    + __u32 cmd = 0;
    +
    + if (send)
    + cmd = pdu->base.command;
    +
    + correct_endian_basic(&pdu->base, send);
    +
    + if (!send)
    + cmd = pdu->base.command;
    +
    + switch (cmd) {
    + case USBIP_CMD_SUBMIT:
    + correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
    + break;
    + case USBIP_RET_SUBMIT:
    + correct_endian_ret_submit(&pdu->u.ret_submit, send);
    + break;
    + case USBIP_CMD_UNLINK:
    + correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
    + break;
    + case USBIP_RET_UNLINK:
    + correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
    + break;
    + default:
    + /* NOTREACHED */
    + err("unknown command in pdu header: %d", cmd);
    + /* BUG(); */
    + }
    +}
    +EXPORT_SYMBOL(usbip_header_correct_endian);
    +
    +static void usbip_iso_pakcet_correct_endian(
    + struct usbip_iso_packet_descriptor *iso,
    + int send)
    +{
    + /* does not need all members. but copy all simply. */
    + if (send) {
    + iso->offset = cpu_to_be32(iso->offset);
    + iso->length = cpu_to_be32(iso->length);
    + iso->status = cpu_to_be32(iso->status);
    + iso->actual_length = cpu_to_be32(iso->actual_length);
    + } else {
    + iso->offset = be32_to_cpu(iso->offset);
    + iso->length = be32_to_cpu(iso->length);
    + iso->status = be32_to_cpu(iso->status);
    + iso->actual_length = be32_to_cpu(iso->actual_length);
    + }
    +}
    +
    +static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
    + struct usb_iso_packet_descriptor *uiso, int pack)
    +{
    + if (pack) {
    + iso->offset = uiso->offset;
    + iso->length = uiso->length;
    + iso->status = uiso->status;
    + iso->actual_length = uiso->actual_length;
    + } else {
    + uiso->offset = iso->offset;
    + uiso->length = iso->length;
    + uiso->status = iso->status;
    + uiso->actual_length = iso->actual_length;
    + }
    +}
    +
    +
    +/* must free buffer */
    +void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
    +{
    + void *buff;
    + struct usbip_iso_packet_descriptor *iso;
    + int np = urb->number_of_packets;
    + ssize_t size = np * sizeof(*iso);
    + int i;
    +
    + buff = kzalloc(size, GFP_KERNEL);
    + if (!buff)
    + return NULL;
    +
    + for (i = 0; i < np; i++) {
    + iso = buff + (i * sizeof(*iso));
    +
    + usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
    + usbip_iso_pakcet_correct_endian(iso, 1);
    + }
    +
    + *bufflen = size;
    +
    + return buff;
    +}
    +EXPORT_SYMBOL(usbip_alloc_iso_desc_pdu);
    +
    +/* some members of urb must be substituted before. */
    +int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
    +{
    + void *buff;
    + struct usbip_iso_packet_descriptor *iso;
    + int np = urb->number_of_packets;
    + int size = np * sizeof(*iso);
    + int i;
    + int ret;
    +
    + if (!usb_pipeisoc(urb->pipe))
    + return 0;
    +
    + /* my Bluetooth dongle gets ISO URBs which are np = 0 */
    + if (np == 0) {
    + /* uinfo("iso np == 0\n"); */
    + /* usbip_dump_urb(urb); */
    + return 0;
    + }
    +
    + buff = kzalloc(size, GFP_KERNEL);
    + if (!buff)
    + return -ENOMEM;
    +
    + ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
    + if (ret != size) {
    + dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
    + ret);
    + kfree(buff);
    +
    + if (ud->side == USBIP_STUB)
    + usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
    + else
    + usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
    +
    + return -EPIPE;
    + }
    +
    + for (i = 0; i < np; i++) {
    + iso = buff + (i * sizeof(*iso));
    +
    + usbip_iso_pakcet_correct_endian(iso, 0);
    + usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
    + }
    +
    +
    + kfree(buff);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(usbip_recv_iso);
    +
    +
    +/* some members of urb must be substituted before. */
    +int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
    +{
    + int ret;
    + int size;
    +
    + if (ud->side == USBIP_STUB) {
    + /* stub_rx.c */
    + /* the direction of urb must be OUT. */
    + if (usb_pipein(urb->pipe))
    + return 0;
    +
    + size = urb->transfer_buffer_length;
    + } else {
    + /* vhci_rx.c */
    + /* the direction of urb must be IN. */
    + if (usb_pipeout(urb->pipe))
    + return 0;
    +
    + size = urb->actual_length;
    + }
    +
    + /* no need to recv xbuff */
    + if (!(size > 0))
    + return 0;
    +
    + ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
    + size, 0);
    + if (ret != size) {
    + dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
    + if (ud->side == USBIP_STUB) {
    + usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
    + } else {
    + usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
    + return -EPIPE;
    + }
    + }
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(usbip_recv_xbuff);
    +
    +
    +/*-------------------------------------------------------------------------*/
    +
    +static int __init usbip_common_init(void)
    +{
    + info(DRIVER_DESC "" DRIVER_VERSION);
    +
    + return 0;
    +}
    +
    +static void __exit usbip_common_exit(void)
    +{
    + return;
    +}
    +
    +
    +
    +
    +module_init(usbip_common_init);
    +module_exit(usbip_common_exit);
    +
    +MODULE_AUTHOR(DRIVER_AUTHOR);
    +MODULE_DESCRIPTION(DRIVER_DESC);
    +MODULE_LICENSE("GPL");
    --- /dev/null
    +++ b/drivers/usb/ip/usbip_common.h
    @@ -0,0 +1,406 @@
    +/*
    + * 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.
    + */
    +
    +#ifndef __VHCI_COMMON_H
    +#define __VHCI_COMMON_H
    +
    +
    +#include <linux/version.h>
    +#include <linux/usb.h>
    +#include <asm/byteorder.h>
    +#include <net/sock.h>
    +
    +/*-------------------------------------------------------------------------*/
    +
    +/*
    + * define macros to print messages
    + */
    +
    +/**
    + * udbg - print debug messages if CONFIG_USB_DEBUG is defined
    + * @fmt:
    + * @args:
    + */
    +
    +#ifdef CONFIG_USB_DEBUG
    +
    +#define udbg(fmt, args...) \
    + do { \
    + printk(KERN_DEBUG "%-10s:(%s,%d) %s: " fmt, \
    + (in_interrupt() ? "interrupt" : (current)->comm),\
    + __FILE__, __LINE__, __func__, ##args); \
    + } while (0)
    +
    +#else /* CONFIG_USB_DEBUG */
    +
    +#define udbg(fmt, args...) do { } while (0)
    +
    +#endif /* CONFIG_USB_DEBUG */
    +
    +
    +enum {
    + usbip_debug_xmit = (1 << 0),
    + usbip_debug_sysfs = (1 << 1),
    + usbip_debug_urb = (1 << 2),
    + usbip_debug_eh = (1 << 3),
    +
    + usbip_debug_stub_cmp = (1 << 8),
    + usbip_debug_stub_dev = (1 << 9),
    + usbip_debug_stub_rx = (1 << 10),
    + usbip_debug_stub_tx = (1 << 11),
    +
    + usbip_debug_vhci_rh = (1 << 8),
    + usbip_debug_vhci_hc = (1 << 9),
    + usbip_debug_vhci_rx = (1 << 10),
    + usbip_debug_vhci_tx = (1 << 11),
    + usbip_debug_vhci_sysfs = (1 << 12)
    +};
    +
    +#define dbg_flag_xmit (usbip_debug_flag & usbip_debug_xmit)
    +#define dbg_flag_vhci_rh (usbip_debug_flag & usbip_debug_vhci_rh)
    +#define dbg_flag_vhci_hc (usbip_debug_flag & usbip_debug_vhci_hc)
    +#define dbg_flag_vhci_rx (usbip_debug_flag & usbip_debug_vhci_rx)
    +#define dbg_flag_vhci_tx (usbip_debug_flag & usbip_debug_vhci_tx)
    +#define dbg_flag_vhci_sysfs (usbip_debug_flag & usbip_debug_vhci_sysfs)
    +#define dbg_flag_stub_rx (usbip_debug_flag & usbip_debug_stub_rx)
    +#define dbg_flag_stub_tx (usbip_debug_flag & usbip_debug_stub_tx)
    +
    +extern unsigned long usbip_debug_flag;
    +extern struct device_attribute dev_attr_usbip_debug;
    +
    +#define dbg_with_flag(flag, fmt, args...) \
    + do { \
    + if (flag & usbip_debug_flag) \
    + udbg(fmt , ##args); \
    + } while (0)
    +
    +#define dbg_sysfs(fmt, args...) \
    + dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
    +#define dbg_xmit(fmt, args...) \
    + dbg_with_flag(usbip_debug_xmit, fmt , ##args)
    +#define dbg_urb(fmt, args...) \
    + dbg_with_flag(usbip_debug_urb, fmt , ##args)
    +#define dbg_eh(fmt, args...) \
    + dbg_with_flag(usbip_debug_eh, fmt , ##args)
    +
    +#define dbg_vhci_rh(fmt, args...) \
    + dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
    +#define dbg_vhci_hc(fmt, args...) \
    + dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
    +#define dbg_vhci_rx(fmt, args...) \
    + dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
    +#define dbg_vhci_tx(fmt, args...) \
    + dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
    +#define dbg_vhci_sysfs(fmt, args...) \
    + dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)
    +
    +#define dbg_stub_cmp(fmt, args...) \
    + dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
    +#define dbg_stub_rx(fmt, args...) \
    + dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
    +#define dbg_stub_tx(fmt, args...) \
    + dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
    +
    +
    +/**
    + * uerr - print error messages
    + * @fmt:
    + * @args:
    + */
    +#define uerr(fmt, args...) \
    + do { \
    + printk(KERN_ERR "%-10s: ***ERROR*** (%s,%d) %s: " fmt, \
    + (in_interrupt() ? "interrupt" : (current)->comm),\
    + __FILE__, __LINE__, __func__, ##args); \
    + } while (0)
    +
    +/**
    + * uinfo - print information messages
    + * @fmt:
    + * @args:
    + */
    +#define uinfo(fmt, args...) \
    + do { \
    + printk(KERN_INFO "usbip: " fmt , ## args); \
    + } while (0)
    +
    +
    +/*-------------------------------------------------------------------------*/
    +
    +/*
    + * USB/IP request headers.
    + * Currently, we define 4 request types:
    + *
    + * - CMD_SUBMIT transfers a USB request, corresponding to usb_submit_urb().
    + * (client to server)
    + * - RET_RETURN transfers the result of CMD_SUBMIT.
    + * (server to client)
    + * - CMD_UNLINK transfers an unlink request of a pending USB request.
    + * (client to server)
    + * - RET_UNLINK transfers the result of CMD_UNLINK.
    + * (server to client)
    + *
    + * Note: The below request formats are based on the USB subsystem of Linux. Its
    + * details will be defined when other implementations come.
    + *
    + *
    + */
    +
    +/*
    + * A basic header followed by other additional headers.
    + */
    +struct usbip_header_basic {
    +#define USBIP_CMD_SUBMIT 0x0001
    +#define USBIP_CMD_UNLINK 0x0002
    +#define USBIP_RET_SUBMIT 0x0003
    +#define USBIP_RET_UNLINK 0x0004
    + __u32 command;
    +
    + /* sequencial number which identifies requests.
    + * incremented per connections */
    + __u32 seqnum;
    +
    + /* devid is used to specify a remote USB device uniquely instead
    + * of busnum and devnum in Linux. In the case of Linux stub_driver,
    + * this value is ((busnum << 16) | devnum) */
    + __u32 devid;
    +
    +#define USBIP_DIR_OUT 0
    +#define USBIP_DIR_IN 1
    + __u32 direction;
    + __u32 ep; /* endpoint number */
    +} __attribute__ ((packed));
    +
    +/*
    + * An additional header for a CMD_SUBMIT packet.
    + */
    +struct usbip_header_cmd_submit {
    + /* these values are basically the same as in a URB. */
    +
    + /* the same in a URB. */
    + __u32 transfer_flags;
    +
    + /* set the following data size (out),
    + * or expected reading data size (in) */
    + __s32 transfer_buffer_length;
    +
    + /* it is difficult for usbip to sync frames (reserved only?) */
    + __s32 start_frame;
    +
    + /* the number of iso descriptors that follows this header */
    + __s32 number_of_packets;
    +
    + /* the maximum time within which this request works in a host
    + * controller of a server side */
    + __s32 interval;
    +
    + /* set setup packet data for a CTRL request */
    + unsigned char setup[8];
    +} __attribute__ ((packed));
    +
    +/*
    + * An additional header for a RET_SUBMIT packet.
    + */
    +struct usbip_header_ret_submit {
    + __s32 status;
    + __s32 actual_length; /* returned data length */
    + __s32 start_frame; /* ISO and INT */
    + __s32 number_of_packets; /* ISO only */
    + __s32 error_count; /* ISO only */
    +} __attribute__ ((packed));
    +
    +/*
    + * An additional header for a CMD_UNLINK packet.
    + */
    +struct usbip_header_cmd_unlink {
    + __u32 seqnum; /* URB's seqnum which will be unlinked */
    +} __attribute__ ((packed));
    +
    +
    +/*
    + * An additional header for a RET_UNLINK packet.
    + */
    +struct usbip_header_ret_unlink {
    + __s32 status;
    +} __attribute__ ((packed));
    +
    +
    +/* the same as usb_iso_packet_descriptor but packed for pdu */
    +struct usbip_iso_packet_descriptor {
    + __u32 offset;
    + __u32 length; /* expected length */
    + __u32 actual_length;
    + __u32 status;
    +} __attribute__ ((packed));
    +
    +
    +/*
    + * All usbip packets use a common header to keep code simple.
    + */
    +struct usbip_header {
    + struct usbip_header_basic base;
    +
    + union {
    + struct usbip_header_cmd_submit cmd_submit;
    + struct usbip_header_ret_submit ret_submit;
    + struct usbip_header_cmd_unlink cmd_unlink;
    + struct usbip_header_ret_unlink ret_unlink;
    + } u;
    +} __attribute__ ((packed));
    +
    +
    +
    +
    +/*-------------------------------------------------------------------------*/
    +
    +
    +int usbip_xmit(int, struct socket *, char *, int, int);
    +int usbip_sendmsg(struct socket *, struct msghdr *, int);
    +
    +
    +static inline int interface_to_busnum(struct usb_interface *interface)
    +{
    + struct usb_device *udev = interface_to_usbdev(interface);
    + return udev->bus->busnum;
    +}
    +
    +static inline int interface_to_devnum(struct usb_interface *interface)
    +{
    + struct usb_device *udev = interface_to_usbdev(interface);
    + return udev->devnum;
    +}
    +
    +static inline int interface_to_infnum(struct usb_interface *interface)
    +{
    + return interface->cur_altsetting->desc.bInterfaceNumber;
    +}
    +
    +#if 0
    +int setnodelay(struct socket *);
    +int setquickack(struct socket *);
    +int setkeepalive(struct socket *socket);
    +void setreuse(struct socket *);
    +#endif
    +
    +struct socket *sockfd_to_socket(unsigned int);
    +int set_sockaddr(struct socket *socket, struct sockaddr_storage *ss);
    +
    +void usbip_dump_urb(struct urb *purb);
    +void usbip_dump_header(struct usbip_header *pdu);
    +
    +
    +struct usbip_device;
    +
    +struct usbip_task {
    + struct task_struct *thread;
    + struct completion thread_done;
    + char *name;
    + void (*loop_ops)(struct usbip_task *);
    +};
    +
    +enum usbip_side {
    + USBIP_VHCI,
    + USBIP_STUB,
    +};
    +
    +enum usbip_status {
    + /* sdev is available. */
    + SDEV_ST_AVAILABLE = 0x01,
    + /* sdev is now used. */
    + SDEV_ST_USED,
    + /* sdev is unusable because of a fatal error. */
    + SDEV_ST_ERROR,
    +
    + /* vdev does not connect a remote device. */
    + VDEV_ST_NULL,
    + /* vdev is used, but the USB address is not assigned yet */
    + VDEV_ST_NOTASSIGNED,
    + VDEV_ST_USED,
    + VDEV_ST_ERROR
    +};
    +
    +/* a common structure for stub_device and vhci_device */
    +struct usbip_device {
    + enum usbip_side side;
    +
    + enum usbip_status status;
    +
    + /* lock for status */
    + spinlock_t lock;
    +
    + struct socket *tcp_socket;
    +
    + struct usbip_task tcp_rx;
    + struct usbip_task tcp_tx;
    +
    + /* event handler */
    +#define USBIP_EH_SHUTDOWN (1 << 0)
    +#define USBIP_EH_BYE (1 << 1)
    +#define USBIP_EH_RESET (1 << 2)
    +#define USBIP_EH_UNUSABLE (1 << 3)
    +
    +#define SDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
    +#define SDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
    +#define SDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
    +#define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
    +#define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
    +
    +#define VDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
    +#define VDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
    +#define VDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
    +#define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
    +
    + unsigned long event;
    + struct usbip_task eh;
    + wait_queue_head_t eh_waitq;
    +
    + struct eh_ops {
    + void (*shutdown)(struct usbip_device *);
    + void (*reset)(struct usbip_device *);
    + void (*unusable)(struct usbip_device *);
    + } eh_ops;
    +};
    +
    +
    +void usbip_task_init(struct usbip_task *ut, char *,
    + void (*loop_ops)(struct usbip_task *));
    +
    +void usbip_start_threads(struct usbip_device *ud);
    +void usbip_stop_threads(struct usbip_device *ud);
    +int usbip_thread(void *param);
    +
    +void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
    + int pack);
    +
    +void usbip_header_correct_endian(struct usbip_header *pdu, int send);
    +/* some members of urb must be substituted before. */
    +int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
    +/* some members of urb must be substituted before. */
    +int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
    +void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
    +
    +
    +/* usbip_event.c */
    +void usbip_start_eh(struct usbip_device *ud);
    +void usbip_stop_eh(struct usbip_device *ud);
    +void usbip_event_add(struct usbip_device *ud, unsigned long event);
    +int usbip_event_happend(struct usbip_device *ud);
    +
    +
    +#endif
    --- /dev/null
    +++ b/drivers/usb/ip/usbip_event.c
    @@ -0,0 +1,141 @@
    +/*
    + * 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"
    +
    +static int event_handler(struct usbip_device *ud)
    +{
    + dbg_eh("enter\n");
    +
    + /*
    + * Events are handled by only this thread.
    + */
    + while (usbip_event_happend(ud)) {
    + dbg_eh("pending event %lx\n", ud->event);
    +
    + /*
    + * NOTE: shutdown must come first.
    + * Shutdown the device.
    + */
    + if (ud->event & USBIP_EH_SHUTDOWN) {
    + ud->eh_ops.shutdown(ud);
    +
    + ud->event &= ~USBIP_EH_SHUTDOWN;
    +
    + break;
    + }
    +
    + /* Stop the error handler. */
    + if (ud->event & USBIP_EH_BYE)
    + return -1;
    +
    + /* Reset the device. */
    + if (ud->event & USBIP_EH_RESET) {
    + ud->eh_ops.reset(ud);
    +
    + ud->event &= ~USBIP_EH_RESET;
    +
    + break;
    + }
    +
    + /* Mark the device as unusable. */
    + if (ud->event & USBIP_EH_UNUSABLE) {
    + ud->eh_ops.unusable(ud);
    +
    + ud->event &= ~USBIP_EH_UNUSABLE;
    +
    + break;
    + }
    +
    + /* NOTREACHED */
    + printk(KERN_ERR "%s: unknown event\n", __func__);
    + return -1;
    + }
    +
    + return 0;
    +}
    +
    +static void event_handler_loop(struct usbip_task *ut)
    +{
    + struct usbip_device *ud = container_of(ut, struct usbip_device, eh);
    +
    + while (1) {
    + if (signal_pending(current)) {
    + dbg_eh("signal catched!\n");
    + break;
    + }
    +
    + if (event_handler(ud) < 0)
    + break;
    +
    + wait_event_interruptible(ud->eh_waitq, usbip_event_happend(ud));
    + dbg_eh("wakeup\n");
    + }
    +}
    +
    +void usbip_start_eh(struct usbip_device *ud)
    +{
    + struct usbip_task *eh = &ud->eh;
    +
    + init_waitqueue_head(&ud->eh_waitq);
    + ud->event = 0;
    +
    + usbip_task_init(eh, "usbip_eh", event_handler_loop);
    +
    + kernel_thread(usbip_thread, (void *)eh, 0);
    +
    + wait_for_completion(&eh->thread_done);
    +}
    +EXPORT_SYMBOL(usbip_start_eh);
    +
    +void usbip_stop_eh(struct usbip_device *ud)
    +{
    + struct usbip_task *eh = &ud->eh;
    +
    + wait_for_completion(&eh->thread_done);
    + dbg_eh("usbip_eh has finished\n");
    +}
    +EXPORT_SYMBOL(usbip_stop_eh);
    +
    +void usbip_event_add(struct usbip_device *ud, unsigned long event)
    +{
    + spin_lock(&ud->lock);
    +
    + ud->event |= event;
    +
    + wake_up(&ud->eh_waitq);
    +
    + spin_unlock(&ud->lock);
    +}
    +EXPORT_SYMBOL(usbip_event_add);
    +
    +int usbip_event_happend(struct usbip_device *ud)
    +{
    + int happend = 0;
    +
    + spin_lock(&ud->lock);
    +
    + if (ud->event != 0)
    + happend = 1;
    +
    + spin_unlock(&ud->lock);
    +
    + return happend;
    +}
    +EXPORT_SYMBOL(usbip_event_happend);
    --- a/drivers/usb/Kconfig
    +++ b/drivers/usb/Kconfig
    @@ -101,6 +101,8 @@ source "drivers/usb/host/Kconfig"

    source "drivers/usb/musb/Kconfig"

    +source "drivers/usb/ip/Kconfig"
    +
    source "drivers/usb/class/Kconfig"

    source "drivers/usb/storage/Kconfig"
    --- a/drivers/usb/Makefile
    +++ b/drivers/usb/Makefile
    @@ -19,6 +19,8 @@ obj-$(CONFIG_USB_R8A66597_HCD) += host/

    obj-$(CONFIG_USB_C67X00_HCD) += c67x00/

    +obj-$(CONFIG_USB_IP_COMMON) += ip/
    +
    obj-$(CONFIG_USB_ACM) += class/
    obj-$(CONFIG_USB_PRINTER) += class/

    --


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