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