2008-07-09 20:56:51 +00:00
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "usbip_common.h"
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#include "vhci.h"
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/* get URB from transmitted urb queue */
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static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
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__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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spin_lock(&vdev->priv_lock);
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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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urb = priv->urb;
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status = urb->status;
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dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
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urb, priv, seqnum);
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/* TODO: fix logic here to improve indent situtation */
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if (status != -EINPROGRESS) {
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if (status == -ENOENT ||
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status == -ECONNRESET)
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dev_info(&urb->dev->dev,
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"urb %p was unlinked "
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"%ssynchronuously.\n", urb,
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status == -ENOENT ? "" : "a");
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else
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dev_info(&urb->dev->dev,
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"urb %p may be in a error, "
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"status %d\n", urb, 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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}
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spin_unlock(&vdev->priv_lock);
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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 usbip_device *ud = &vdev->ud;
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struct urb *urb;
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urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
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if (!urb) {
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uerr("cannot find a urb of seqnum %u\n", pdu->base.seqnum);
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uinfo("max seqnum %d\n", atomic_read(&the_controller->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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return;
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/* recv iso_packet_descriptor */
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if (usbip_recv_iso(ud, urb) < 0)
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return;
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if (dbg_flag_vhci_rx)
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usbip_dump_urb(urb);
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dbg_vhci_rx("now giveback urb %p\n", urb);
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spin_lock(&the_controller->lock);
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usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
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spin_unlock(&the_controller->lock);
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usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
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dbg_vhci_rx("Leave\n");
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return;
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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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spin_lock(&vdev->priv_lock);
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list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
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uinfo("unlink->seqnum %lu\n", unlink->seqnum);
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if (unlink->seqnum == pdu->base.seqnum) {
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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(&vdev->priv_lock);
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return unlink;
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}
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}
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spin_unlock(&vdev->priv_lock);
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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_unlink *unlink;
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struct urb *urb;
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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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uinfo("cannot find the pending unlink %u\n", pdu->base.seqnum);
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return;
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}
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urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
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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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uinfo("the urb (seqnum %d) was already given backed\n",
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pdu->base.seqnum);
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} else {
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dbg_vhci_rx("now giveback urb %p\n", urb);
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/* If unlink is succeed, status is -ECONNRESET */
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urb->status = pdu->u.ret_unlink.status;
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uinfo("%d\n", urb->status);
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spin_lock(&the_controller->lock);
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usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
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spin_unlock(&the_controller->lock);
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usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
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urb->status);
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}
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kfree(unlink);
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return;
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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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dbg_vhci_rx("Enter\n");
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memset(&pdu, 0, sizeof(pdu));
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/* 1. receive a pdu header */
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ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
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if (ret != sizeof(pdu)) {
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uerr("receiving pdu failed! size is %d, should be %d\n",
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2002-04-09 19:14:34 +00:00
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ret, (unsigned int)sizeof(pdu));
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2008-07-09 20:56:51 +00:00
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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 (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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/* NOTREACHED */
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uerr("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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}
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}
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/*-------------------------------------------------------------------------*/
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void vhci_rx_loop(struct usbip_task *ut)
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{
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struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);
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while (1) {
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if (signal_pending(current)) {
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dbg_vhci_rx("signal catched!\n");
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break;
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}
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if (usbip_event_happend(ud))
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break;
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vhci_rx_pdu(ud);
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}
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}
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