399 lines
9.9 KiB
C
399 lines
9.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*/
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#include <linux/kthread.h>
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#include <linux/socket.h>
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#include "usbip_common.h"
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#include "stub.h"
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static void stub_free_priv_and_urb(struct stub_priv *priv)
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{
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struct urb *urb = priv->urb;
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kfree(urb->setup_packet);
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urb->setup_packet = NULL;
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kfree(urb->transfer_buffer);
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urb->transfer_buffer = NULL;
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list_del(&priv->list);
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kmem_cache_free(stub_priv_cache, priv);
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usb_free_urb(urb);
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}
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/* be in spin_lock_irqsave(&sdev->priv_lock, flags) */
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void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
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__u32 status)
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{
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struct stub_unlink *unlink;
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unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC);
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if (!unlink) {
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usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC);
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return;
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}
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unlink->seqnum = seqnum;
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unlink->status = status;
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list_add_tail(&unlink->list, &sdev->unlink_tx);
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}
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/**
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* stub_complete - completion handler of a usbip urb
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* @urb: pointer to the urb completed
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*
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* When a urb has completed, the USB core driver calls this function mostly in
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* the interrupt context. To return the result of a urb, the completed urb is
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* linked to the pending list of returning.
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*
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*/
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void stub_complete(struct urb *urb)
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{
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struct stub_priv *priv = (struct stub_priv *) urb->context;
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struct stub_device *sdev = priv->sdev;
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unsigned long flags;
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usbip_dbg_stub_tx("complete! status %d\n", urb->status);
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switch (urb->status) {
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case 0:
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/* OK */
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break;
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case -ENOENT:
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dev_info(&urb->dev->dev,
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"stopped by a call to usb_kill_urb() because of cleaning up a virtual connection\n");
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return;
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case -ECONNRESET:
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dev_info(&urb->dev->dev,
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"unlinked by a call to usb_unlink_urb()\n");
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break;
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case -EPIPE:
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dev_info(&urb->dev->dev, "endpoint %d is stalled\n",
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usb_pipeendpoint(urb->pipe));
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break;
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case -ESHUTDOWN:
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dev_info(&urb->dev->dev, "device removed?\n");
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break;
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default:
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dev_info(&urb->dev->dev,
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"urb completion with non-zero status %d\n",
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urb->status);
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break;
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}
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/* link a urb to the queue of tx. */
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spin_lock_irqsave(&sdev->priv_lock, flags);
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if (sdev->ud.tcp_socket == NULL) {
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usbip_dbg_stub_tx("ignore urb for closed connection\n");
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/* It will be freed in stub_device_cleanup_urbs(). */
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} else if (priv->unlinking) {
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stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status);
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stub_free_priv_and_urb(priv);
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} else {
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list_move_tail(&priv->list, &sdev->priv_tx);
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}
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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/* wake up tx_thread */
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wake_up(&sdev->tx_waitq);
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}
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static inline void setup_base_pdu(struct usbip_header_basic *base,
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__u32 command, __u32 seqnum)
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{
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base->command = command;
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base->seqnum = seqnum;
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base->devid = 0;
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base->ep = 0;
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base->direction = 0;
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}
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static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb)
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{
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struct stub_priv *priv = (struct stub_priv *) urb->context;
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setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum);
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usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1);
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}
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static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
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struct stub_unlink *unlink)
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{
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setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
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rpdu->u.ret_unlink.status = unlink->status;
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}
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static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev)
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{
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unsigned long flags;
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struct stub_priv *priv, *tmp;
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spin_lock_irqsave(&sdev->priv_lock, flags);
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list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) {
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list_move_tail(&priv->list, &sdev->priv_free);
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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return priv;
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}
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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return NULL;
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}
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static int stub_send_ret_submit(struct stub_device *sdev)
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{
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unsigned long flags;
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struct stub_priv *priv, *tmp;
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struct msghdr msg;
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size_t txsize;
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size_t total_size = 0;
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while ((priv = dequeue_from_priv_tx(sdev)) != NULL) {
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int ret;
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struct urb *urb = priv->urb;
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struct usbip_header pdu_header;
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struct usbip_iso_packet_descriptor *iso_buffer = NULL;
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struct kvec *iov = NULL;
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int iovnum = 0;
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txsize = 0;
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memset(&pdu_header, 0, sizeof(pdu_header));
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memset(&msg, 0, sizeof(msg));
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if (urb->actual_length > 0 && !urb->transfer_buffer) {
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dev_err(&sdev->udev->dev,
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"urb: actual_length %d transfer_buffer null\n",
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urb->actual_length);
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return -1;
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}
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if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
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iovnum = 2 + urb->number_of_packets;
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else
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iovnum = 2;
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iov = kcalloc(iovnum, sizeof(struct kvec), GFP_KERNEL);
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if (!iov) {
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usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC);
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return -1;
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}
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iovnum = 0;
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/* 1. setup usbip_header */
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setup_ret_submit_pdu(&pdu_header, urb);
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usbip_dbg_stub_tx("setup txdata seqnum: %d\n",
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pdu_header.base.seqnum);
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usbip_header_correct_endian(&pdu_header, 1);
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iov[iovnum].iov_base = &pdu_header;
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iov[iovnum].iov_len = sizeof(pdu_header);
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iovnum++;
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txsize += sizeof(pdu_header);
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/* 2. setup transfer buffer */
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if (usb_pipein(urb->pipe) &&
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usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS &&
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urb->actual_length > 0) {
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iov[iovnum].iov_base = urb->transfer_buffer;
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iov[iovnum].iov_len = urb->actual_length;
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iovnum++;
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txsize += urb->actual_length;
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} else if (usb_pipein(urb->pipe) &&
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usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
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/*
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* For isochronous packets: actual length is the sum of
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* the actual length of the individual, packets, but as
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* the packet offsets are not changed there will be
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* padding between the packets. To optimally use the
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* bandwidth the padding is not transmitted.
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*/
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int i;
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for (i = 0; i < urb->number_of_packets; i++) {
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iov[iovnum].iov_base = urb->transfer_buffer +
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urb->iso_frame_desc[i].offset;
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iov[iovnum].iov_len =
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urb->iso_frame_desc[i].actual_length;
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iovnum++;
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txsize += urb->iso_frame_desc[i].actual_length;
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}
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if (txsize != sizeof(pdu_header) + urb->actual_length) {
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dev_err(&sdev->udev->dev,
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"actual length of urb %d does not match iso packet sizes %zu\n",
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urb->actual_length,
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txsize-sizeof(pdu_header));
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kfree(iov);
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usbip_event_add(&sdev->ud,
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SDEV_EVENT_ERROR_TCP);
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return -1;
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}
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}
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/* 3. setup iso_packet_descriptor */
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if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
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ssize_t len = 0;
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iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
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if (!iso_buffer) {
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usbip_event_add(&sdev->ud,
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SDEV_EVENT_ERROR_MALLOC);
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kfree(iov);
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return -1;
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}
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iov[iovnum].iov_base = iso_buffer;
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iov[iovnum].iov_len = len;
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txsize += len;
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iovnum++;
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}
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ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg,
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iov, iovnum, txsize);
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if (ret != txsize) {
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dev_err(&sdev->udev->dev,
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"sendmsg failed!, retval %d for %zd\n",
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ret, txsize);
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kfree(iov);
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kfree(iso_buffer);
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usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
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return -1;
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}
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kfree(iov);
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kfree(iso_buffer);
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total_size += txsize;
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}
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spin_lock_irqsave(&sdev->priv_lock, flags);
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list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) {
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stub_free_priv_and_urb(priv);
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}
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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return total_size;
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}
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static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev)
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{
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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_move_tail(&unlink->list, &sdev->unlink_free);
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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return unlink;
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}
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spin_unlock_irqrestore(&sdev->priv_lock, flags);
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return NULL;
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}
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static int stub_send_ret_unlink(struct stub_device *sdev)
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{
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unsigned long flags;
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struct stub_unlink *unlink, *tmp;
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struct msghdr msg;
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struct kvec iov[1];
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size_t txsize;
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size_t total_size = 0;
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while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) {
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int ret;
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struct usbip_header pdu_header;
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txsize = 0;
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memset(&pdu_header, 0, sizeof(pdu_header));
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memset(&msg, 0, sizeof(msg));
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memset(&iov, 0, sizeof(iov));
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usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum);
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/* 1. setup usbip_header */
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setup_ret_unlink_pdu(&pdu_header, unlink);
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usbip_header_correct_endian(&pdu_header, 1);
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iov[0].iov_base = &pdu_header;
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iov[0].iov_len = sizeof(pdu_header);
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txsize += sizeof(pdu_header);
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ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
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1, txsize);
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if (ret != txsize) {
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dev_err(&sdev->udev->dev,
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"sendmsg failed!, retval %d for %zd\n",
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ret, txsize);
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usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
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return -1;
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}
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usbip_dbg_stub_tx("send txdata\n");
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total_size += txsize;
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}
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spin_lock_irqsave(&sdev->priv_lock, flags);
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list_for_each_entry_safe(unlink, tmp, &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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return total_size;
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}
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int stub_tx_loop(void *data)
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{
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struct usbip_device *ud = data;
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struct stub_device *sdev = container_of(ud, struct stub_device, ud);
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while (!kthread_should_stop()) {
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if (usbip_event_happened(ud))
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break;
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/*
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* send_ret_submit comes earlier than send_ret_unlink. stub_rx
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* looks at only priv_init queue. If the completion of a URB is
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||
|
|
* 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) ||
|
||
|
|
kthread_should_stop()));
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|