779 lines
18 KiB
C
779 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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* Copyright (C) 2015-2016 Samsung Electronics
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*/
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#include <asm/byteorder.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <net/sock.h>
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#include "usbip_common.h"
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#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
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#define DRIVER_DESC "USB/IP Core"
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#ifdef CONFIG_USBIP_DEBUG
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unsigned long usbip_debug_flag = 0xffffffff;
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#else
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unsigned long usbip_debug_flag;
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#endif
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EXPORT_SYMBOL_GPL(usbip_debug_flag);
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module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");
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/* FIXME */
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struct device_attribute dev_attr_usbip_debug;
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EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
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static ssize_t usbip_debug_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%lx\n", usbip_debug_flag);
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}
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static ssize_t usbip_debug_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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if (sscanf(buf, "%lx", &usbip_debug_flag) != 1)
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return -EINVAL;
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return count;
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}
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DEVICE_ATTR_RW(usbip_debug);
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static void usbip_dump_buffer(char *buff, int bufflen)
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{
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print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
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buff, bufflen, false);
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}
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static void usbip_dump_pipe(unsigned int p)
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{
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unsigned char type = usb_pipetype(p);
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unsigned char ep = usb_pipeendpoint(p);
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unsigned char dev = usb_pipedevice(p);
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unsigned char dir = usb_pipein(p);
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pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
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switch (type) {
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case PIPE_ISOCHRONOUS:
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pr_debug("ISO\n");
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break;
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case PIPE_INTERRUPT:
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pr_debug("INT\n");
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break;
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case PIPE_CONTROL:
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pr_debug("CTRL\n");
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break;
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case PIPE_BULK:
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pr_debug("BULK\n");
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break;
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default:
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pr_debug("ERR\n");
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break;
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}
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}
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static void usbip_dump_usb_device(struct usb_device *udev)
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{
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struct device *dev = &udev->dev;
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int i;
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dev_dbg(dev, " devnum(%d) devpath(%s) usb speed(%s)",
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udev->devnum, udev->devpath, usb_speed_string(udev->speed));
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pr_debug("tt hub ttport %d\n", udev->ttport);
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dev_dbg(dev, " ");
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for (i = 0; i < 16; i++)
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pr_debug(" %2u", i);
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pr_debug("\n");
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dev_dbg(dev, " toggle0(IN) :");
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for (i = 0; i < 16; i++)
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pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
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pr_debug("\n");
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dev_dbg(dev, " toggle1(OUT):");
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for (i = 0; i < 16; i++)
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pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
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pr_debug("\n");
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dev_dbg(dev, " epmaxp_in :");
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for (i = 0; i < 16; i++) {
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if (udev->ep_in[i])
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pr_debug(" %2u",
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le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
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}
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pr_debug("\n");
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dev_dbg(dev, " epmaxp_out :");
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for (i = 0; i < 16; i++) {
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if (udev->ep_out[i])
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pr_debug(" %2u",
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le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
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}
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pr_debug("\n");
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dev_dbg(dev, "parent %s, bus %s\n", dev_name(&udev->parent->dev),
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udev->bus->bus_name);
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dev_dbg(dev, "have_langid %d, string_langid %d\n",
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udev->have_langid, udev->string_langid);
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dev_dbg(dev, "maxchild %d\n", udev->maxchild);
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}
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static void usbip_dump_request_type(__u8 rt)
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{
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switch (rt & USB_RECIP_MASK) {
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case USB_RECIP_DEVICE:
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pr_debug("DEVICE");
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break;
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case USB_RECIP_INTERFACE:
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pr_debug("INTERF");
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break;
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case USB_RECIP_ENDPOINT:
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pr_debug("ENDPOI");
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break;
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case USB_RECIP_OTHER:
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pr_debug("OTHER ");
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break;
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default:
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pr_debug("------");
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break;
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}
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}
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static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
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{
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if (!cmd) {
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pr_debug(" : null pointer\n");
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return;
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}
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pr_debug(" ");
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pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ",
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cmd->bRequestType, cmd->bRequest,
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cmd->wValue, cmd->wIndex, cmd->wLength);
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pr_debug("\n ");
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if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
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pr_debug("STANDARD ");
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switch (cmd->bRequest) {
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case USB_REQ_GET_STATUS:
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pr_debug("GET_STATUS\n");
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break;
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case USB_REQ_CLEAR_FEATURE:
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pr_debug("CLEAR_FEAT\n");
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break;
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case USB_REQ_SET_FEATURE:
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pr_debug("SET_FEAT\n");
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break;
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case USB_REQ_SET_ADDRESS:
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pr_debug("SET_ADDRRS\n");
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break;
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case USB_REQ_GET_DESCRIPTOR:
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pr_debug("GET_DESCRI\n");
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break;
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case USB_REQ_SET_DESCRIPTOR:
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pr_debug("SET_DESCRI\n");
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break;
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case USB_REQ_GET_CONFIGURATION:
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pr_debug("GET_CONFIG\n");
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break;
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case USB_REQ_SET_CONFIGURATION:
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pr_debug("SET_CONFIG\n");
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break;
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case USB_REQ_GET_INTERFACE:
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pr_debug("GET_INTERF\n");
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break;
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case USB_REQ_SET_INTERFACE:
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pr_debug("SET_INTERF\n");
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break;
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case USB_REQ_SYNCH_FRAME:
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pr_debug("SYNC_FRAME\n");
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break;
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default:
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pr_debug("REQ(%02X)\n", cmd->bRequest);
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break;
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}
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usbip_dump_request_type(cmd->bRequestType);
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} else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
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pr_debug("CLASS\n");
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} else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
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pr_debug("VENDOR\n");
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} else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
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pr_debug("RESERVED\n");
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}
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}
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void usbip_dump_urb(struct urb *urb)
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{
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struct device *dev;
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if (!urb) {
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pr_debug("urb: null pointer!!\n");
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return;
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}
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if (!urb->dev) {
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pr_debug("urb->dev: null pointer!!\n");
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return;
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}
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dev = &urb->dev->dev;
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usbip_dump_usb_device(urb->dev);
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dev_dbg(dev, " pipe :%08x ", urb->pipe);
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usbip_dump_pipe(urb->pipe);
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dev_dbg(dev, " status :%d\n", urb->status);
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dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
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dev_dbg(dev, " transfer_buffer_length:%d\n",
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urb->transfer_buffer_length);
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dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
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if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
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usbip_dump_usb_ctrlrequest(
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(struct usb_ctrlrequest *)urb->setup_packet);
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dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
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dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
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dev_dbg(dev, " interval :%d\n", urb->interval);
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dev_dbg(dev, " error_count :%d\n", urb->error_count);
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}
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EXPORT_SYMBOL_GPL(usbip_dump_urb);
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void usbip_dump_header(struct usbip_header *pdu)
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{
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pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
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pdu->base.command,
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pdu->base.seqnum,
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pdu->base.devid,
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pdu->base.direction,
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pdu->base.ep);
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switch (pdu->base.command) {
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case USBIP_CMD_SUBMIT:
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pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n",
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pdu->u.cmd_submit.transfer_flags,
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pdu->u.cmd_submit.transfer_buffer_length,
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pdu->u.cmd_submit.start_frame,
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pdu->u.cmd_submit.number_of_packets,
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pdu->u.cmd_submit.interval);
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break;
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case USBIP_CMD_UNLINK:
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pr_debug("USBIP_CMD_UNLINK: seq %u\n",
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pdu->u.cmd_unlink.seqnum);
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break;
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case USBIP_RET_SUBMIT:
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pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
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pdu->u.ret_submit.status,
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pdu->u.ret_submit.actual_length,
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pdu->u.ret_submit.start_frame,
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pdu->u.ret_submit.number_of_packets,
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pdu->u.ret_submit.error_count);
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break;
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case USBIP_RET_UNLINK:
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pr_debug("USBIP_RET_UNLINK: status %d\n",
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pdu->u.ret_unlink.status);
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break;
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default:
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/* NOT REACHED */
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pr_err("unknown command\n");
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break;
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}
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}
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EXPORT_SYMBOL_GPL(usbip_dump_header);
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/* Receive data over TCP/IP. */
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int usbip_recv(struct socket *sock, void *buf, int size)
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{
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int result;
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struct kvec iov = {.iov_base = buf, .iov_len = size};
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struct msghdr msg = {.msg_flags = MSG_NOSIGNAL};
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int total = 0;
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if (!sock || !buf || !size)
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return -EINVAL;
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iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size);
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usbip_dbg_xmit("enter\n");
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do {
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sock->sk->sk_allocation = GFP_NOIO;
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result = sock_recvmsg(sock, &msg, MSG_WAITALL);
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if (result <= 0)
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goto err;
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total += result;
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} while (msg_data_left(&msg));
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if (usbip_dbg_flag_xmit) {
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if (!in_interrupt())
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pr_debug("%-10s:", current->comm);
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else
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pr_debug("interrupt :");
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pr_debug("receiving....\n");
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usbip_dump_buffer(buf, size);
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pr_debug("received, osize %d ret %d size %zd total %d\n",
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size, result, msg_data_left(&msg), total);
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}
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return total;
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err:
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return result;
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}
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EXPORT_SYMBOL_GPL(usbip_recv);
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/* there may be more cases to tweak the flags. */
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static unsigned int tweak_transfer_flags(unsigned int flags)
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{
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flags &= ~URB_NO_TRANSFER_DMA_MAP;
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return flags;
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}
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static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
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int pack)
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{
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struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
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/*
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* Some members are not still implemented in usbip. I hope this issue
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* will be discussed when usbip is ported to other operating systems.
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*/
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if (pack) {
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spdu->transfer_flags =
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tweak_transfer_flags(urb->transfer_flags);
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spdu->transfer_buffer_length = urb->transfer_buffer_length;
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spdu->start_frame = urb->start_frame;
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spdu->number_of_packets = urb->number_of_packets;
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spdu->interval = urb->interval;
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} else {
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urb->transfer_flags = spdu->transfer_flags;
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urb->transfer_buffer_length = spdu->transfer_buffer_length;
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urb->start_frame = spdu->start_frame;
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urb->number_of_packets = spdu->number_of_packets;
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urb->interval = spdu->interval;
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}
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}
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static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
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int pack)
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{
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struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
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if (pack) {
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rpdu->status = urb->status;
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rpdu->actual_length = urb->actual_length;
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rpdu->start_frame = urb->start_frame;
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rpdu->number_of_packets = urb->number_of_packets;
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rpdu->error_count = urb->error_count;
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} else {
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urb->status = rpdu->status;
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urb->actual_length = rpdu->actual_length;
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urb->start_frame = rpdu->start_frame;
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urb->number_of_packets = rpdu->number_of_packets;
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urb->error_count = rpdu->error_count;
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}
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}
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void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
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int pack)
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{
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switch (cmd) {
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case USBIP_CMD_SUBMIT:
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usbip_pack_cmd_submit(pdu, urb, pack);
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break;
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case USBIP_RET_SUBMIT:
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usbip_pack_ret_submit(pdu, urb, pack);
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break;
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default:
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/* NOT REACHED */
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pr_err("unknown command\n");
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break;
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}
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}
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EXPORT_SYMBOL_GPL(usbip_pack_pdu);
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static void correct_endian_basic(struct usbip_header_basic *base, int send)
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{
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if (send) {
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base->command = cpu_to_be32(base->command);
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base->seqnum = cpu_to_be32(base->seqnum);
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base->devid = cpu_to_be32(base->devid);
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base->direction = cpu_to_be32(base->direction);
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base->ep = cpu_to_be32(base->ep);
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} else {
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base->command = be32_to_cpu(base->command);
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base->seqnum = be32_to_cpu(base->seqnum);
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base->devid = be32_to_cpu(base->devid);
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base->direction = be32_to_cpu(base->direction);
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base->ep = be32_to_cpu(base->ep);
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}
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}
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static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
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int send)
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{
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if (send) {
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pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
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cpu_to_be32s(&pdu->transfer_buffer_length);
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cpu_to_be32s(&pdu->start_frame);
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cpu_to_be32s(&pdu->number_of_packets);
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cpu_to_be32s(&pdu->interval);
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} else {
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pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
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be32_to_cpus(&pdu->transfer_buffer_length);
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be32_to_cpus(&pdu->start_frame);
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be32_to_cpus(&pdu->number_of_packets);
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be32_to_cpus(&pdu->interval);
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}
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}
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static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
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int send)
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{
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if (send) {
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cpu_to_be32s(&pdu->status);
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cpu_to_be32s(&pdu->actual_length);
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cpu_to_be32s(&pdu->start_frame);
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cpu_to_be32s(&pdu->number_of_packets);
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cpu_to_be32s(&pdu->error_count);
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} else {
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be32_to_cpus(&pdu->status);
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be32_to_cpus(&pdu->actual_length);
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be32_to_cpus(&pdu->start_frame);
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be32_to_cpus(&pdu->number_of_packets);
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be32_to_cpus(&pdu->error_count);
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}
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}
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static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
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int send)
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{
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if (send)
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pdu->seqnum = cpu_to_be32(pdu->seqnum);
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else
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pdu->seqnum = be32_to_cpu(pdu->seqnum);
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}
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static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
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int send)
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{
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if (send)
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cpu_to_be32s(&pdu->status);
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else
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be32_to_cpus(&pdu->status);
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}
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void usbip_header_correct_endian(struct usbip_header *pdu, int send)
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{
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__u32 cmd = 0;
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if (send)
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cmd = pdu->base.command;
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|
|
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:
|
|
/* NOT REACHED */
|
|
pr_err("unknown command\n");
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
|
|
|
|
static void usbip_iso_packet_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 */
|
|
struct usbip_iso_packet_descriptor*
|
|
usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
|
|
{
|
|
struct usbip_iso_packet_descriptor *iso;
|
|
int np = urb->number_of_packets;
|
|
ssize_t size = np * sizeof(*iso);
|
|
int i;
|
|
|
|
iso = kzalloc(size, GFP_KERNEL);
|
|
if (!iso)
|
|
return NULL;
|
|
|
|
for (i = 0; i < np; i++) {
|
|
usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1);
|
|
usbip_iso_packet_correct_endian(&iso[i], 1);
|
|
}
|
|
|
|
*bufflen = size;
|
|
|
|
return iso;
|
|
}
|
|
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;
|
|
int total_length = 0;
|
|
|
|
if (!usb_pipeisoc(urb->pipe))
|
|
return 0;
|
|
|
|
/* my Bluetooth dongle gets ISO URBs which are np = 0 */
|
|
if (np == 0)
|
|
return 0;
|
|
|
|
buff = kzalloc(size, GFP_KERNEL);
|
|
if (!buff)
|
|
return -ENOMEM;
|
|
|
|
ret = usbip_recv(ud->tcp_socket, buff, size);
|
|
if (ret != size) {
|
|
dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
|
|
ret);
|
|
kfree(buff);
|
|
|
|
if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
|
|
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
|
|
else
|
|
usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
|
|
|
|
return -EPIPE;
|
|
}
|
|
|
|
iso = (struct usbip_iso_packet_descriptor *) buff;
|
|
for (i = 0; i < np; i++) {
|
|
usbip_iso_packet_correct_endian(&iso[i], 0);
|
|
usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0);
|
|
total_length += urb->iso_frame_desc[i].actual_length;
|
|
}
|
|
|
|
kfree(buff);
|
|
|
|
if (total_length != urb->actual_length) {
|
|
dev_err(&urb->dev->dev,
|
|
"total length of iso packets %d not equal to actual length of buffer %d\n",
|
|
total_length, urb->actual_length);
|
|
|
|
if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
|
|
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_iso);
|
|
|
|
/*
|
|
* This functions restores the padding which was removed for optimizing
|
|
* the bandwidth during transfer over tcp/ip
|
|
*
|
|
* buffer and iso packets need to be stored and be in propeper endian in urb
|
|
* before calling this function
|
|
*/
|
|
void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
|
|
{
|
|
int np = urb->number_of_packets;
|
|
int i;
|
|
int actualoffset = urb->actual_length;
|
|
|
|
if (!usb_pipeisoc(urb->pipe))
|
|
return;
|
|
|
|
/* if no packets or length of data is 0, then nothing to unpack */
|
|
if (np == 0 || urb->actual_length == 0)
|
|
return;
|
|
|
|
/*
|
|
* if actual_length is transfer_buffer_length then no padding is
|
|
* present.
|
|
*/
|
|
if (urb->actual_length == urb->transfer_buffer_length)
|
|
return;
|
|
|
|
/*
|
|
* loop over all packets from last to first (to prevent overwriting
|
|
* memory when padding) and move them into the proper place
|
|
*/
|
|
for (i = np-1; i > 0; i--) {
|
|
actualoffset -= urb->iso_frame_desc[i].actual_length;
|
|
memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
|
|
urb->transfer_buffer + actualoffset,
|
|
urb->iso_frame_desc[i].actual_length);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbip_pad_iso);
|
|
|
|
/* some members of urb must be substituted before. */
|
|
int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
|
|
{
|
|
struct scatterlist *sg;
|
|
int ret = 0;
|
|
int recv;
|
|
int size;
|
|
int copy;
|
|
int i;
|
|
|
|
if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
|
|
/* the direction of urb must be OUT. */
|
|
if (usb_pipein(urb->pipe))
|
|
return 0;
|
|
|
|
size = urb->transfer_buffer_length;
|
|
} else {
|
|
/* 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;
|
|
|
|
if (size > urb->transfer_buffer_length)
|
|
/* should not happen, probably malicious packet */
|
|
goto error;
|
|
|
|
if (urb->num_sgs) {
|
|
copy = size;
|
|
for_each_sg(urb->sg, sg, urb->num_sgs, i) {
|
|
int recv_size;
|
|
|
|
if (copy < sg->length)
|
|
recv_size = copy;
|
|
else
|
|
recv_size = sg->length;
|
|
|
|
recv = usbip_recv(ud->tcp_socket, sg_virt(sg),
|
|
recv_size);
|
|
|
|
if (recv != recv_size)
|
|
goto error;
|
|
|
|
copy -= recv;
|
|
ret += recv;
|
|
|
|
if (!copy)
|
|
break;
|
|
}
|
|
|
|
if (ret != size)
|
|
goto error;
|
|
} else {
|
|
ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
|
|
if (ret != size)
|
|
goto error;
|
|
}
|
|
|
|
return ret;
|
|
|
|
error:
|
|
dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
|
|
if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
|
|
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
|
|
else
|
|
usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
|
|
|
|
return -EPIPE;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
|
|
|
|
static int __init usbip_core_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = usbip_init_eh();
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit usbip_core_exit(void)
|
|
{
|
|
usbip_finish_eh();
|
|
return;
|
|
}
|
|
|
|
module_init(usbip_core_init);
|
|
module_exit(usbip_core_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|