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Staging: USB/IP: add common functions needed

Browse source 
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>
This commit is contained in:
Takahiro Hirofuchi 2008-07-09 14:56:51 -06:00 committed by Greg Kroah-Hartman
parent 866b8695d6
commit 05a1f28e87
8 changed files with 1573 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/staging/Kconfig
View file

@ -33,4 +33,6 @@ source "drivers/staging/me4000/Kconfig"
source "drivers/staging/go7007/Kconfig"
source "drivers/staging/usbip/Kconfig"
endif # STAGING

1
drivers/staging/Makefile
View file

@ -5,3 +5,4 @@ obj-$(CONFIG_SLICOSS) += slicoss/
obj-$(CONFIG_SXG) += sxg/
obj-$(CONFIG_ME4000) += me4000/
obj-$(CONFIG_VIDEO_GO7007) += go7007/
obj-$(CONFIG_USB_IP_COMMON) += usbip/

14
drivers/staging/usbip/Kconfig Normal file
View file

@ -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.

6
drivers/staging/usbip/Makefile Normal file
View file

@ -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

6
drivers/staging/usbip/README Normal file
View file

@ -0,0 +1,6 @@
TODO:
- more discussion about the protocol
- testing
- review of the userspace interface
Please send patches for this code to Greg Kroah-Hartman <greg@kroah.com>

997
drivers/staging/usbip/usbip_common.c Normal file
View file

@ -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_GPL(usbip_debug_flag);
/* FIXME */
struct device_attribute dev_attr_usbip_debug;
EXPORT_SYMBOL_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(usbip_recv_xbuff);
/*-------------------------------------------------------------------------*/
static int __init usbip_common_init(void)
{
printk(KERN_INFO KBUILD_MODNAME ": " 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");

406
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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#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

141
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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
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_GPL(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_GPL(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_GPL(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_GPL(usbip_event_happend);