278 lines
6.6 KiB
C
278 lines
6.6 KiB
C
/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include "usbip_common.h"
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#include "vhci.h"
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/* get URB from transmitted urb queue. caller must hold vdev->priv_lock */
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struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum)
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{
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struct vhci_priv *priv, *tmp;
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struct urb *urb = NULL;
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int status;
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list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
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if (priv->seqnum != seqnum)
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continue;
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urb = priv->urb;
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status = urb->status;
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usbip_dbg_vhci_rx("find urb seqnum %u\n", seqnum);
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switch (status) {
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case -ENOENT:
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/* fall through */
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case -ECONNRESET:
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dev_dbg(&urb->dev->dev,
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"urb seq# %u was unlinked %ssynchronuously\n",
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seqnum, status == -ENOENT ? "" : "a");
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break;
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case -EINPROGRESS:
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/* no info output */
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break;
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default:
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dev_dbg(&urb->dev->dev,
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"urb seq# %u may be in a error, status %d\n",
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seqnum, status);
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}
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list_del(&priv->list);
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kfree(priv);
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urb->hcpriv = NULL;
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break;
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}
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return urb;
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}
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static void vhci_recv_ret_submit(struct vhci_device *vdev,
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struct usbip_header *pdu)
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{
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struct vhci_hcd *vhci = vdev_to_vhci(vdev);
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struct usbip_device *ud = &vdev->ud;
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struct urb *urb;
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unsigned long flags;
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spin_lock_irqsave(&vdev->priv_lock, flags);
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urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
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spin_unlock_irqrestore(&vdev->priv_lock, flags);
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if (!urb) {
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pr_err("cannot find a urb of seqnum %u max seqnum %d\n",
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pdu->base.seqnum,
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atomic_read(&vhci->seqnum));
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usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
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return;
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}
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/* unpack the pdu to a urb */
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usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);
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/* recv transfer buffer */
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if (usbip_recv_xbuff(ud, urb) < 0) {
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urb->status = -EPROTO;
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goto error;
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}
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/* recv iso_packet_descriptor */
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if (usbip_recv_iso(ud, urb) < 0) {
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urb->status = -EPROTO;
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goto error;
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}
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/* restore the padding in iso packets */
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usbip_pad_iso(ud, urb);
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error:
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if (usbip_dbg_flag_vhci_rx)
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usbip_dump_urb(urb);
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usbip_dbg_vhci_rx("now giveback urb %u\n", pdu->base.seqnum);
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spin_lock_irqsave(&vhci->lock, flags);
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usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb);
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spin_unlock_irqrestore(&vhci->lock, flags);
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usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
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usbip_dbg_vhci_rx("Leave\n");
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}
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static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
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struct usbip_header *pdu)
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{
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struct vhci_unlink *unlink, *tmp;
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unsigned long flags;
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spin_lock_irqsave(&vdev->priv_lock, flags);
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list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
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pr_info("unlink->seqnum %lu\n", unlink->seqnum);
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if (unlink->seqnum == pdu->base.seqnum) {
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usbip_dbg_vhci_rx("found pending unlink, %lu\n",
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unlink->seqnum);
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list_del(&unlink->list);
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spin_unlock_irqrestore(&vdev->priv_lock, flags);
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return unlink;
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}
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}
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spin_unlock_irqrestore(&vdev->priv_lock, flags);
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return NULL;
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}
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static void vhci_recv_ret_unlink(struct vhci_device *vdev,
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struct usbip_header *pdu)
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{
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struct vhci_hcd *vhci = vdev_to_vhci(vdev);
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struct vhci_unlink *unlink;
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struct urb *urb;
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unsigned long flags;
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usbip_dump_header(pdu);
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unlink = dequeue_pending_unlink(vdev, pdu);
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if (!unlink) {
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pr_info("cannot find the pending unlink %u\n",
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pdu->base.seqnum);
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return;
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}
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spin_lock_irqsave(&vdev->priv_lock, flags);
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urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
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spin_unlock_irqrestore(&vdev->priv_lock, flags);
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if (!urb) {
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/*
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* I get the result of a unlink request. But, it seems that I
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* already received the result of its submit result and gave
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* back the URB.
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*/
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pr_info("the urb (seqnum %d) was already given back\n",
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pdu->base.seqnum);
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} else {
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usbip_dbg_vhci_rx("now giveback urb %d\n", pdu->base.seqnum);
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/* If unlink is successful, status is -ECONNRESET */
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urb->status = pdu->u.ret_unlink.status;
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pr_info("urb->status %d\n", urb->status);
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spin_lock_irqsave(&vhci->lock, flags);
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usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb);
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spin_unlock_irqrestore(&vhci->lock, flags);
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usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
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}
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kfree(unlink);
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}
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static int vhci_priv_tx_empty(struct vhci_device *vdev)
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{
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int empty = 0;
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unsigned long flags;
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spin_lock_irqsave(&vdev->priv_lock, flags);
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empty = list_empty(&vdev->priv_rx);
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spin_unlock_irqrestore(&vdev->priv_lock, flags);
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return empty;
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}
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/* recv a pdu */
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static void vhci_rx_pdu(struct usbip_device *ud)
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{
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int ret;
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struct usbip_header pdu;
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struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
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usbip_dbg_vhci_rx("Enter\n");
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memset(&pdu, 0, sizeof(pdu));
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/* receive a pdu header */
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ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
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if (ret < 0) {
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if (ret == -ECONNRESET)
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pr_info("connection reset by peer\n");
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else if (ret == -EAGAIN) {
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/* ignore if connection was idle */
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if (vhci_priv_tx_empty(vdev))
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return;
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pr_info("connection timed out with pending urbs\n");
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} else if (ret != -ERESTARTSYS)
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pr_info("xmit failed %d\n", ret);
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usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
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return;
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}
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if (ret == 0) {
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pr_info("connection closed");
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usbip_event_add(ud, VDEV_EVENT_DOWN);
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return;
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}
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if (ret != sizeof(pdu)) {
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pr_err("received pdu size is %d, should be %d\n", ret,
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(unsigned int)sizeof(pdu));
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usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
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return;
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}
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usbip_header_correct_endian(&pdu, 0);
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if (usbip_dbg_flag_vhci_rx)
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usbip_dump_header(&pdu);
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switch (pdu.base.command) {
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case USBIP_RET_SUBMIT:
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vhci_recv_ret_submit(vdev, &pdu);
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break;
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case USBIP_RET_UNLINK:
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vhci_recv_ret_unlink(vdev, &pdu);
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break;
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default:
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/* NOT REACHED */
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pr_err("unknown pdu %u\n", pdu.base.command);
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usbip_dump_header(&pdu);
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usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
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break;
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}
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}
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int vhci_rx_loop(void *data)
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{
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struct usbip_device *ud = data;
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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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vhci_rx_pdu(ud);
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}
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return 0;
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}
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