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767 lines
18 KiB
767 lines
18 KiB
// 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 <[email protected]> |
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*/ |
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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 <[email protected]>" |
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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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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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|
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if (send) |
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cmd = pdu->base.command; |
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correct_endian_basic(&pdu->base, send); |
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|
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if (!send) |
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cmd = pdu->base.command; |
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switch (cmd) { |
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case USBIP_CMD_SUBMIT: |
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correct_endian_cmd_submit(&pdu->u.cmd_submit, send); |
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break; |
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case USBIP_RET_SUBMIT: |
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correct_endian_ret_submit(&pdu->u.ret_submit, send); |
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break; |
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case USBIP_CMD_UNLINK: |
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correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send); |
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break; |
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case USBIP_RET_UNLINK: |
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correct_endian_ret_unlink(&pdu->u.ret_unlink, send); |
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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_header_correct_endian); |
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|
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static void usbip_iso_packet_correct_endian( |
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struct usbip_iso_packet_descriptor *iso, int send) |
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{ |
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/* does not need all members. but copy all simply. */ |
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if (send) { |
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iso->offset = cpu_to_be32(iso->offset); |
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iso->length = cpu_to_be32(iso->length); |
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iso->status = cpu_to_be32(iso->status); |
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iso->actual_length = cpu_to_be32(iso->actual_length); |
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} else { |
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iso->offset = be32_to_cpu(iso->offset); |
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iso->length = be32_to_cpu(iso->length); |
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iso->status = be32_to_cpu(iso->status); |
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iso->actual_length = be32_to_cpu(iso->actual_length); |
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} |
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} |
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|
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static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso, |
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struct usb_iso_packet_descriptor *uiso, int pack) |
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{ |
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if (pack) { |
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iso->offset = uiso->offset; |
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iso->length = uiso->length; |
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iso->status = uiso->status; |
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iso->actual_length = uiso->actual_length; |
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} else { |
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uiso->offset = iso->offset; |
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uiso->length = iso->length; |
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uiso->status = iso->status; |
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uiso->actual_length = iso->actual_length; |
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} |
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} |
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|
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/* must free buffer */ |
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struct usbip_iso_packet_descriptor* |
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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) |
|
{ |
|
return usbip_init_eh(); |
|
} |
|
|
|
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");
|
|
|