Staging: USB/IP: add host driver
This adds the USB IP client driver Brian Merrell cleaned up a lot of this code and submitted it for inclusion. Greg also did a lot of cleanup. Signed-off-by: Brian G. Merrell <bgmerrell@novell.com> Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Takahiro Hirofuchi
Greg Kroah-Hartman
Родитель
04679b3489
Коммит
4d7b5c7f8a
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@ -23,3 +23,14 @@ config USB_IP_VHCI_HCD
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To compile this driver as a module, choose M here: the
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module will be called vhci_hcd.
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config USB_IP_HOST
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tristate "USB IP host driver"
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depends on USB_IP_COMMON
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default N
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---help---
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This enables the USB IP device driver which will run on the
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host machine.
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To compile this driver as a module, choose M here: the
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module will be called usbip.
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@ -4,6 +4,9 @@ usbip_common_mod-objs := usbip_common.o usbip_event.o
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obj-$(CONFIG_USB_IP_VHCI_HCD) += vhci-hcd.o
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vhci-hcd-objs := vhci_sysfs.o vhci_tx.o vhci_rx.o vhci_hcd.o
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obj-$(CONFIG_USB_IP_HOST) += usbip.o
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usbip-objs := stub_dev.o stub_main.o stub_rx.o stub_tx.o
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ifeq ($(CONFIG_USB_DEBUG),y)
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EXTRA_CFLAGS += -DDEBUG
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endif
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@ -0,0 +1,95 @@
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/net.h>
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struct stub_device {
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struct usb_interface *interface;
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struct list_head list;
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struct usbip_device ud;
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__u32 devid;
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/*
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* stub_priv preserves private data of each urb.
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* It is allocated as stub_priv_cache and assigned to urb->context.
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*
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* stub_priv is always linked to any one of 3 lists;
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* priv_init: linked to this until the comletion of a urb.
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* priv_tx : linked to this after the completion of a urb.
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* priv_free: linked to this after the sending of the result.
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*
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* Any of these list operations should be locked by priv_lock.
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*/
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spinlock_t priv_lock;
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struct list_head priv_init;
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struct list_head priv_tx;
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struct list_head priv_free;
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/* see comments for unlinking in stub_rx.c */
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struct list_head unlink_tx;
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struct list_head unlink_free;
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wait_queue_head_t tx_waitq;
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};
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/* private data into urb->priv */
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struct stub_priv {
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unsigned long seqnum;
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struct list_head list;
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struct stub_device *sdev;
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struct urb *urb;
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int unlinking;
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};
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struct stub_unlink {
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unsigned long seqnum;
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struct list_head list;
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__u32 status;
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};
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extern struct kmem_cache *stub_priv_cache;
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/*-------------------------------------------------------------------------*/
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/* prototype declarations */
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/* stub_tx.c */
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void stub_complete(struct urb *);
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void stub_tx_loop(struct usbip_task *);
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/* stub_dev.c */
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extern struct usb_driver stub_driver;
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/* stub_rx.c */
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void stub_rx_loop(struct usbip_task *);
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void stub_enqueue_ret_unlink(struct stub_device *, __u32, __u32);
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/* stub_main.c */
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int match_busid(char *busid);
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void stub_device_cleanup_urbs(struct stub_device *sdev);
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@ -0,0 +1,483 @@
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "usbip_common.h"
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#include "stub.h"
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static int stub_probe(struct usb_interface *interface,
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const struct usb_device_id *id);
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static void stub_disconnect(struct usb_interface *interface);
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/*
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* Define device IDs here if you want to explicitly limit exportable devices.
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* In the most cases, wild card matching will be ok because driver binding can
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* be changed dynamically by a userland program.
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*/
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static struct usb_device_id stub_table[] = {
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#if 0
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/* just an example */
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{ USB_DEVICE(0x05ac, 0x0301) }, /* Mac 1 button mouse */
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{ USB_DEVICE(0x0430, 0x0009) }, /* Plat Home Keyboard */
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{ USB_DEVICE(0x059b, 0x0001) }, /* Iomega USB Zip 100 */
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{ USB_DEVICE(0x04b3, 0x4427) }, /* IBM USB CD-ROM */
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{ USB_DEVICE(0x05a9, 0xa511) }, /* LifeView USB cam */
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{ USB_DEVICE(0x55aa, 0x0201) }, /* Imation card reader */
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{ USB_DEVICE(0x046d, 0x0870) }, /* Qcam Express(QV-30) */
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{ USB_DEVICE(0x04bb, 0x0101) }, /* IO-DATA HD 120GB */
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{ USB_DEVICE(0x04bb, 0x0904) }, /* IO-DATA USB-ET/TX */
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{ USB_DEVICE(0x04bb, 0x0201) }, /* IO-DATA USB-ET/TX */
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{ USB_DEVICE(0x08bb, 0x2702) }, /* ONKYO USB Speaker */
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{ USB_DEVICE(0x046d, 0x08b2) }, /* Logicool Qcam 4000 Pro */
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#endif
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/* magic for wild card */
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{ .driver_info = 1 },
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{ 0, } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, stub_table);
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struct usb_driver stub_driver = {
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.name = "usbip",
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.probe = stub_probe,
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.disconnect = stub_disconnect,
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.id_table = stub_table,
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};
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/*-------------------------------------------------------------------------*/
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/* Define sysfs entries for a usbip-bound device */
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/*
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* usbip_status shows status of usbip as long as this driver is bound to the
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* target device.
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*/
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static ssize_t show_status(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct stub_device *sdev = dev_get_drvdata(dev);
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int status;
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if (!sdev) {
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dev_err(dev, "sdev is null\n");
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return -ENODEV;
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}
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spin_lock(&sdev->ud.lock);
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status = sdev->ud.status;
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spin_unlock(&sdev->ud.lock);
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return snprintf(buf, PAGE_SIZE, "%d\n", status);
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}
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static DEVICE_ATTR(usbip_status, S_IRUGO, show_status, NULL);
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/*
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* usbip_sockfd gets a socket descriptor of an established TCP connection that
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* is used to transfer usbip requests by kernel threads. -1 is a magic number
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* by which usbip connection is finished.
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*/
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static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct stub_device *sdev = dev_get_drvdata(dev);
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int sockfd = 0;
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struct socket *socket;
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if (!sdev) {
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dev_err(dev, "sdev is null\n");
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return -ENODEV;
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}
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sscanf(buf, "%d", &sockfd);
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if (sockfd != -1) {
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dev_info(dev, "stub up\n");
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spin_lock(&sdev->ud.lock);
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if (sdev->ud.status != SDEV_ST_AVAILABLE) {
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dev_err(dev, "not ready\n");
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spin_unlock(&sdev->ud.lock);
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return -EINVAL;
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}
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socket = sockfd_to_socket(sockfd);
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if (!socket) {
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spin_unlock(&sdev->ud.lock);
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return -EINVAL;
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}
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#if 0
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setnodelay(socket);
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setkeepalive(socket);
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setreuse(socket);
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#endif
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sdev->ud.tcp_socket = socket;
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spin_unlock(&sdev->ud.lock);
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usbip_start_threads(&sdev->ud);
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spin_lock(&sdev->ud.lock);
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sdev->ud.status = SDEV_ST_USED;
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spin_unlock(&sdev->ud.lock);
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} else {
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dev_info(dev, "stub down\n");
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spin_lock(&sdev->ud.lock);
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if (sdev->ud.status != SDEV_ST_USED) {
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spin_unlock(&sdev->ud.lock);
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return -EINVAL;
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}
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spin_unlock(&sdev->ud.lock);
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usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN);
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}
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return count;
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}
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static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
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static int stub_add_files(struct device *dev)
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{
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int err = 0;
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err = device_create_file(dev, &dev_attr_usbip_status);
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if (err)
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goto err_status;
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err = device_create_file(dev, &dev_attr_usbip_sockfd);
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if (err)
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goto err_sockfd;
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err = device_create_file(dev, &dev_attr_usbip_debug);
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if (err)
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goto err_debug;
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return 0;
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err_debug:
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device_remove_file(dev, &dev_attr_usbip_sockfd);
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err_sockfd:
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device_remove_file(dev, &dev_attr_usbip_status);
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err_status:
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return err;
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}
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static void stub_remove_files(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_usbip_status);
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device_remove_file(dev, &dev_attr_usbip_sockfd);
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device_remove_file(dev, &dev_attr_usbip_debug);
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}
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/*-------------------------------------------------------------------------*/
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/* Event handler functions called by an event handler thread */
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static void stub_shutdown_connection(struct usbip_device *ud)
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{
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struct stub_device *sdev = container_of(ud, struct stub_device, ud);
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/*
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* When removing an exported device, kernel panic sometimes occurred
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* and then EIP was sk_wait_data of stub_rx thread. Is this because
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* sk_wait_data returned though stub_rx thread was already finished by
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* step 1?
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*/
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if (ud->tcp_socket) {
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udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
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kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
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}
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/* 1. stop threads */
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usbip_stop_threads(ud);
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/* 2. close the socket */
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/*
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* tcp_socket is freed after threads are killed.
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* So usbip_xmit do not touch NULL socket.
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*/
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if (ud->tcp_socket) {
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sock_release(ud->tcp_socket);
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ud->tcp_socket = NULL;
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}
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/* 3. free used data */
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stub_device_cleanup_urbs(sdev);
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/* 4. free stub_unlink */
|
||||
{
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unsigned long flags;
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struct stub_unlink *unlink, *tmp;
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spin_lock_irqsave(&sdev->priv_lock, flags);
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list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
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list_del(&unlink->list);
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kfree(unlink);
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}
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list_for_each_entry_safe(unlink, tmp,
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&sdev->unlink_free, list) {
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list_del(&unlink->list);
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kfree(unlink);
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||||
}
|
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||||
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
||||
}
|
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}
|
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static void stub_device_reset(struct usbip_device *ud)
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||||
{
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struct stub_device *sdev = container_of(ud, struct stub_device, ud);
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struct usb_device *udev = interface_to_usbdev(sdev->interface);
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int ret;
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||||
|
||||
udbg("device reset");
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ret = usb_lock_device_for_reset(udev, sdev->interface);
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if (ret < 0) {
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dev_err(&udev->dev, "lock for reset\n");
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||||
|
||||
spin_lock(&ud->lock);
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||||
ud->status = SDEV_ST_ERROR;
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spin_unlock(&ud->lock);
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return;
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}
|
||||
|
||||
/* try to reset the device */
|
||||
ret = usb_reset_device(udev);
|
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|
||||
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)
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{
|
||||
spin_lock(&ud->lock);
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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");
|
||||
}
|
||||
|
|
@ -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");
|
||||
|
|
@ -0,0 +1,615 @@
|
|||
/*
|
||||
* Copyright (C) 2003-2008 Takahiro Hirofuchi
|
||||
*
|
||||
* This is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
* USA.
|
||||
*/
|
||||
|
||||
#include "usbip_common.h"
|
||||
#include "stub.h"
|
||||
#include "../../usb/core/hcd.h"
|
||||
|
||||
|
||||
static int is_clear_halt_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
|
||||
return (req->bRequest == USB_REQ_CLEAR_FEATURE) &&
|
||||
(req->bRequestType == USB_RECIP_ENDPOINT) &&
|
||||
(req->wValue == USB_ENDPOINT_HALT);
|
||||
}
|
||||
|
||||
static int is_set_interface_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
|
||||
return (req->bRequest == USB_REQ_SET_INTERFACE) &&
|
||||
(req->bRequestType == USB_RECIP_INTERFACE);
|
||||
}
|
||||
|
||||
static int is_set_configuration_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
|
||||
return (req->bRequest == USB_REQ_SET_CONFIGURATION) &&
|
||||
(req->bRequestType == USB_RECIP_DEVICE);
|
||||
}
|
||||
|
||||
static int is_reset_device_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
__u16 value;
|
||||
__u16 index;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
value = le16_to_cpu(req->wValue);
|
||||
index = le16_to_cpu(req->wIndex);
|
||||
|
||||
if ((req->bRequest == USB_REQ_SET_FEATURE) &&
|
||||
(req->bRequestType == USB_RT_PORT) &&
|
||||
(value = USB_PORT_FEAT_RESET)) {
|
||||
dbg_stub_rx("reset_device_cmd, port %u\n", index);
|
||||
return 1;
|
||||
} else
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tweak_clear_halt_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
int target_endp;
|
||||
int target_dir;
|
||||
int target_pipe;
|
||||
int ret;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
|
||||
/*
|
||||
* The stalled endpoint is specified in the wIndex value. The endpoint
|
||||
* of the urb is the target of this clear_halt request (i.e., control
|
||||
* endpoint).
|
||||
*/
|
||||
target_endp = le16_to_cpu(req->wIndex) & 0x000f;
|
||||
|
||||
/* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80. */
|
||||
target_dir = le16_to_cpu(req->wIndex) & 0x0080;
|
||||
|
||||
if (target_dir)
|
||||
target_pipe = usb_rcvctrlpipe(urb->dev, target_endp);
|
||||
else
|
||||
target_pipe = usb_sndctrlpipe(urb->dev, target_endp);
|
||||
|
||||
ret = usb_clear_halt(urb->dev, target_pipe);
|
||||
if (ret < 0)
|
||||
uinfo("clear_halt error: devnum %d endp %d, %d\n",
|
||||
urb->dev->devnum, target_endp, ret);
|
||||
else
|
||||
uinfo("clear_halt done: devnum %d endp %d\n",
|
||||
urb->dev->devnum, target_endp);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int tweak_set_interface_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
__u16 alternate;
|
||||
__u16 interface;
|
||||
int ret;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
alternate = le16_to_cpu(req->wValue);
|
||||
interface = le16_to_cpu(req->wIndex);
|
||||
|
||||
dbg_stub_rx("set_interface: inf %u alt %u\n", interface, alternate);
|
||||
|
||||
ret = usb_set_interface(urb->dev, interface, alternate);
|
||||
if (ret < 0)
|
||||
uinfo("set_interface error: inf %u alt %u, %d\n",
|
||||
interface, alternate, ret);
|
||||
else
|
||||
uinfo("set_interface done: inf %u alt %u\n",
|
||||
interface,
|
||||
alternate);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int tweak_set_configuration_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
__u16 config;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
config = le16_to_cpu(req->wValue);
|
||||
|
||||
/*
|
||||
* I have never seen a multi-config device. Very rare.
|
||||
* For most devices, this will be called to choose a default
|
||||
* configuration only once in an initialization phase.
|
||||
*
|
||||
* set_configuration may change a device configuration and its device
|
||||
* drivers will be unbound and assigned for a new device configuration.
|
||||
* This means this usbip driver will be also unbound when called, then
|
||||
* eventually reassigned to the device as far as driver matching
|
||||
* condition is kept.
|
||||
*
|
||||
* Unfortunatelly, an existing usbip connection will be dropped
|
||||
* due to this driver unbinding. So, skip here.
|
||||
* A user may need to set a special configuration value before
|
||||
* exporting the device.
|
||||
*/
|
||||
uinfo("set_configuration (%d) to %s\n", config, urb->dev->dev.bus_id);
|
||||
uinfo("but, skip!\n");
|
||||
|
||||
return 0;
|
||||
/* return usb_driver_set_configuration(urb->dev, config); */
|
||||
}
|
||||
|
||||
static int tweak_reset_device_cmd(struct urb *urb)
|
||||
{
|
||||
struct usb_ctrlrequest *req;
|
||||
__u16 value;
|
||||
__u16 index;
|
||||
int ret;
|
||||
|
||||
req = (struct usb_ctrlrequest *) urb->setup_packet;
|
||||
value = le16_to_cpu(req->wValue);
|
||||
index = le16_to_cpu(req->wIndex);
|
||||
|
||||
uinfo("reset_device (port %d) to %s\n", index, urb->dev->dev.bus_id);
|
||||
|
||||
/* all interfaces should be owned by usbip driver, so just reset it. */
|
||||
ret = usb_lock_device_for_reset(urb->dev, NULL);
|
||||
if (ret < 0) {
|
||||
dev_err(&urb->dev->dev, "lock for reset\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* try to reset the device */
|
||||
ret = usb_reset_device(urb->dev);
|
||||
if (ret < 0)
|
||||
dev_err(&urb->dev->dev, "device reset\n");
|
||||
|
||||
usb_unlock_device(urb->dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* clear_halt, set_interface, and set_configuration require special tricks.
|
||||
*/
|
||||
static void tweak_special_requests(struct urb *urb)
|
||||
{
|
||||
if (!urb || !urb->setup_packet)
|
||||
return;
|
||||
|
||||
if (usb_pipetype(urb->pipe) != PIPE_CONTROL)
|
||||
return;
|
||||
|
||||
if (is_clear_halt_cmd(urb))
|
||||
/* tweak clear_halt */
|
||||
tweak_clear_halt_cmd(urb);
|
||||
|
||||
else if (is_set_interface_cmd(urb))
|
||||
/* tweak set_interface */
|
||||
tweak_set_interface_cmd(urb);
|
||||
|
||||
else if (is_set_configuration_cmd(urb))
|
||||
/* tweak set_configuration */
|
||||
tweak_set_configuration_cmd(urb);
|
||||
|
||||
else if (is_reset_device_cmd(urb))
|
||||
tweak_reset_device_cmd(urb);
|
||||
else
|
||||
dbg_stub_rx("no need to tweak\n");
|
||||
}
|
||||
|
||||
/*
|
||||
* stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb().
|
||||
* By unlinking the urb asynchronously, stub_rx can continuously
|
||||
* process coming urbs. Even if the urb is unlinked, its completion
|
||||
* handler will be called and stub_tx will send a return pdu.
|
||||
*
|
||||
* See also comments about unlinking strategy in vhci_hcd.c.
|
||||
*/
|
||||
static int stub_recv_cmd_unlink(struct stub_device *sdev,
|
||||
struct usbip_header *pdu)
|
||||
{
|
||||
struct list_head *listhead = &sdev->priv_init;
|
||||
struct list_head *ptr;
|
||||
unsigned long flags;
|
||||
|
||||
struct stub_priv *priv;
|
||||
|
||||
|
||||
spin_lock_irqsave(&sdev->priv_lock, flags);
|
||||
|
||||
for (ptr = listhead->next; ptr != listhead; ptr = ptr->next) {
|
||||
priv = list_entry(ptr, struct stub_priv, list);
|
||||
if (priv->seqnum == pdu->u.cmd_unlink.seqnum) {
|
||||
int ret;
|
||||
|
||||
dev_info(&priv->urb->dev->dev, "unlink urb %p\n",
|
||||
priv->urb);
|
||||
|
||||
/*
|
||||
* This matched urb is not completed yet (i.e., be in
|
||||
* flight in usb hcd hardware/driver). Now we are
|
||||
* cancelling it. The unlinking flag means that we are
|
||||
* now not going to return the normal result pdu of a
|
||||
* submission request, but going to return a result pdu
|
||||
* of the unlink request.
|
||||
*/
|
||||
priv->unlinking = 1;
|
||||
|
||||
/*
|
||||
* In the case that unlinking flag is on, prev->seqnum
|
||||
* is changed from the seqnum of the cancelling urb to
|
||||
* the seqnum of the unlink request. This will be used
|
||||
* to make the result pdu of the unlink request.
|
||||
*/
|
||||
priv->seqnum = pdu->base.seqnum;
|
||||
|
||||
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
||||
|
||||
/*
|
||||
* usb_unlink_urb() is now out of spinlocking to avoid
|
||||
* spinlock recursion since stub_complete() is
|
||||
* sometimes called in this context but not in the
|
||||
* interrupt context. If stub_complete() is executed
|
||||
* before we call usb_unlink_urb(), usb_unlink_urb()
|
||||
* will return an error value. In this case, stub_tx
|
||||
* will return the result pdu of this unlink request
|
||||
* though submission is completed and actual unlinking
|
||||
* is not executed. OK?
|
||||
*/
|
||||
/* In the above case, urb->status is not -ECONNRESET,
|
||||
* so a driver in a client host will know the failure
|
||||
* of the unlink request ?
|
||||
*/
|
||||
ret = usb_unlink_urb(priv->urb);
|
||||
if (ret != -EINPROGRESS)
|
||||
dev_err(&priv->urb->dev->dev,
|
||||
"failed to unlink a urb %p, ret %d\n",
|
||||
priv->urb, ret);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
dbg_stub_rx("seqnum %d is not pending\n", pdu->u.cmd_unlink.seqnum);
|
||||
|
||||
/*
|
||||
* The urb of the unlink target is not found in priv_init queue. It was
|
||||
* already completed and its results is/was going to be sent by a
|
||||
* CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only
|
||||
* return the completeness of this unlink request to vhci_hcd.
|
||||
*/
|
||||
stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0);
|
||||
|
||||
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int valid_request(struct stub_device *sdev, struct usbip_header *pdu)
|
||||
{
|
||||
struct usbip_device *ud = &sdev->ud;
|
||||
|
||||
if (pdu->base.devid == sdev->devid) {
|
||||
spin_lock(&ud->lock);
|
||||
if (ud->status == SDEV_ST_USED) {
|
||||
/* A request is valid. */
|
||||
spin_unlock(&ud->lock);
|
||||
return 1;
|
||||
}
|
||||
spin_unlock(&ud->lock);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct stub_priv *stub_priv_alloc(struct stub_device *sdev,
|
||||
struct usbip_header *pdu)
|
||||
{
|
||||
struct stub_priv *priv;
|
||||
struct usbip_device *ud = &sdev->ud;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&sdev->priv_lock, flags);
|
||||
|
||||
priv = kmem_cache_alloc(stub_priv_cache, GFP_ATOMIC);
|
||||
if (!priv) {
|
||||
dev_err(&sdev->interface->dev, "alloc stub_priv\n");
|
||||
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
memset(priv, 0, sizeof(struct stub_priv));
|
||||
|
||||
priv->seqnum = pdu->base.seqnum;
|
||||
priv->sdev = sdev;
|
||||
|
||||
/*
|
||||
* After a stub_priv is linked to a list_head,
|
||||
* our error handler can free allocated data.
|
||||
*/
|
||||
list_add_tail(&priv->list, &sdev->priv_init);
|
||||
|
||||
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
||||
|
||||
return priv;
|
||||
}
|
||||
|
||||
|
||||
static struct usb_host_endpoint *get_ep_from_epnum(struct usb_device *udev,
|
||||
int epnum0)
|
||||
{
|
||||
struct usb_host_config *config;
|
||||
int i = 0, j = 0;
|
||||
struct usb_host_endpoint *ep = NULL;
|
||||
int epnum;
|
||||
int found = 0;
|
||||
|
||||
if (epnum0 == 0)
|
||||
return &udev->ep0;
|
||||
|
||||
config = udev->actconfig;
|
||||
if (!config)
|
||||
return NULL;
|
||||
|
||||
for (i = 0; i < config->desc.bNumInterfaces; i++) {
|
||||
struct usb_host_interface *setting;
|
||||
|
||||
setting = config->interface[i]->cur_altsetting;
|
||||
|
||||
for (j = 0; j < setting->desc.bNumEndpoints; j++) {
|
||||
ep = &setting->endpoint[j];
|
||||
epnum = (ep->desc.bEndpointAddress & 0x7f);
|
||||
|
||||
if (epnum == epnum0) {
|
||||
/* uinfo("found epnum %d\n", epnum0); */
|
||||
found = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (found)
|
||||
return ep;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
||||
static int get_pipe(struct stub_device *sdev, int epnum, int dir)
|
||||
{
|
||||
struct usb_device *udev = interface_to_usbdev(sdev->interface);
|
||||
struct usb_host_endpoint *ep;
|
||||
struct usb_endpoint_descriptor *epd = NULL;
|
||||
|
||||
ep = get_ep_from_epnum(udev, epnum);
|
||||
if (!ep) {
|
||||
dev_err(&sdev->interface->dev, "no such endpoint?, %d\n",
|
||||
epnum);
|
||||
BUG();
|
||||
}
|
||||
|
||||
epd = &ep->desc;
|
||||
|
||||
|
||||
#if 0
|
||||
/* epnum 0 is always control */
|
||||
if (epnum == 0) {
|
||||
if (dir == USBIP_DIR_OUT)
|
||||
return usb_sndctrlpipe(udev, 0);
|
||||
else
|
||||
return usb_rcvctrlpipe(udev, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
if (usb_endpoint_xfer_control(epd)) {
|
||||
if (dir == USBIP_DIR_OUT)
|
||||
return usb_sndctrlpipe(udev, epnum);
|
||||
else
|
||||
return usb_rcvctrlpipe(udev, epnum);
|
||||
}
|
||||
|
||||
if (usb_endpoint_xfer_bulk(epd)) {
|
||||
if (dir == USBIP_DIR_OUT)
|
||||
return usb_sndbulkpipe(udev, epnum);
|
||||
else
|
||||
return usb_rcvbulkpipe(udev, epnum);
|
||||
}
|
||||
|
||||
if (usb_endpoint_xfer_int(epd)) {
|
||||
if (dir == USBIP_DIR_OUT)
|
||||
return usb_sndintpipe(udev, epnum);
|
||||
else
|
||||
return usb_rcvintpipe(udev, epnum);
|
||||
}
|
||||
|
||||
if (usb_endpoint_xfer_isoc(epd)) {
|
||||
if (dir == USBIP_DIR_OUT)
|
||||
return usb_sndisocpipe(udev, epnum);
|
||||
else
|
||||
return usb_rcvisocpipe(udev, epnum);
|
||||
}
|
||||
|
||||
/* NOT REACHED */
|
||||
dev_err(&sdev->interface->dev, "get pipe, epnum %d\n", epnum);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void stub_recv_cmd_submit(struct stub_device *sdev,
|
||||
struct usbip_header *pdu)
|
||||
{
|
||||
int ret;
|
||||
struct stub_priv *priv;
|
||||
struct usbip_device *ud = &sdev->ud;
|
||||
struct usb_device *udev = interface_to_usbdev(sdev->interface);
|
||||
int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction);
|
||||
|
||||
|
||||
priv = stub_priv_alloc(sdev, pdu);
|
||||
if (!priv)
|
||||
return;
|
||||
|
||||
/* setup a urb */
|
||||
if (usb_pipeisoc(pipe))
|
||||
priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
|
||||
GFP_KERNEL);
|
||||
else
|
||||
priv->urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
|
||||
if (!priv->urb) {
|
||||
dev_err(&sdev->interface->dev, "malloc urb\n");
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
|
||||
return;
|
||||
}
|
||||
|
||||
/* set priv->urb->transfer_buffer */
|
||||
if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
|
||||
priv->urb->transfer_buffer =
|
||||
kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
|
||||
GFP_KERNEL);
|
||||
if (!priv->urb->transfer_buffer) {
|
||||
dev_err(&sdev->interface->dev, "malloc x_buff\n");
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
/* set priv->urb->setup_packet */
|
||||
priv->urb->setup_packet = kzalloc(8, GFP_KERNEL);
|
||||
if (!priv->urb->setup_packet) {
|
||||
dev_err(&sdev->interface->dev, "allocate setup_packet\n");
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
|
||||
return;
|
||||
}
|
||||
memcpy(priv->urb->setup_packet, &pdu->u.cmd_submit.setup, 8);
|
||||
|
||||
/* set other members from the base header of pdu */
|
||||
priv->urb->context = (void *) priv;
|
||||
priv->urb->dev = udev;
|
||||
priv->urb->pipe = pipe;
|
||||
priv->urb->complete = stub_complete;
|
||||
|
||||
usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0);
|
||||
|
||||
|
||||
if (usbip_recv_xbuff(ud, priv->urb) < 0)
|
||||
return;
|
||||
|
||||
if (usbip_recv_iso(ud, priv->urb) < 0)
|
||||
return;
|
||||
|
||||
/* no need to submit an intercepted request, but harmless? */
|
||||
tweak_special_requests(priv->urb);
|
||||
|
||||
/* urb is now ready to submit */
|
||||
ret = usb_submit_urb(priv->urb, GFP_KERNEL);
|
||||
|
||||
if (ret == 0)
|
||||
dbg_stub_rx("submit urb ok, seqnum %u\n", pdu->base.seqnum);
|
||||
else {
|
||||
dev_err(&sdev->interface->dev, "submit_urb error, %d\n", ret);
|
||||
usbip_dump_header(pdu);
|
||||
usbip_dump_urb(priv->urb);
|
||||
|
||||
/*
|
||||
* Pessimistic.
|
||||
* This connection will be discarded.
|
||||
*/
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
|
||||
}
|
||||
|
||||
dbg_stub_rx("Leave\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* recv a pdu */
|
||||
static void stub_rx_pdu(struct usbip_device *ud)
|
||||
{
|
||||
int ret;
|
||||
struct usbip_header pdu;
|
||||
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
|
||||
struct device *dev = &sdev->interface->dev;
|
||||
|
||||
dbg_stub_rx("Enter\n");
|
||||
|
||||
memset(&pdu, 0, sizeof(pdu));
|
||||
|
||||
/* 1. receive a pdu header */
|
||||
ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
|
||||
if (ret != sizeof(pdu)) {
|
||||
dev_err(dev, "recv a header, %d\n", ret);
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
|
||||
return;
|
||||
}
|
||||
|
||||
usbip_header_correct_endian(&pdu, 0);
|
||||
|
||||
if (dbg_flag_stub_rx)
|
||||
usbip_dump_header(&pdu);
|
||||
|
||||
if (!valid_request(sdev, &pdu)) {
|
||||
dev_err(dev, "recv invalid request\n");
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (pdu.base.command) {
|
||||
case USBIP_CMD_UNLINK:
|
||||
stub_recv_cmd_unlink(sdev, &pdu);
|
||||
break;
|
||||
|
||||
case USBIP_CMD_SUBMIT:
|
||||
stub_recv_cmd_submit(sdev, &pdu);
|
||||
break;
|
||||
|
||||
default:
|
||||
/* NOTREACHED */
|
||||
dev_err(dev, "unknown pdu\n");
|
||||
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
|
||||
return;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
void stub_rx_loop(struct usbip_task *ut)
|
||||
{
|
||||
struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);
|
||||
|
||||
while (1) {
|
||||
if (signal_pending(current)) {
|
||||
dbg_stub_rx("signal caught!\n");
|
||||
break;
|
||||
}
|
||||
|
||||
if (usbip_event_happend(ud))
|
||||
break;
|
||||
|
||||
stub_rx_pdu(ud);
|
||||
}
|
||||
}
|
||||
|
|
@ -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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