Contributors: 17
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Takahiro Hirofuchi |
753 |
67.90% |
1 |
3.85% |
| Max Vozeler |
157 |
14.16% |
3 |
11.54% |
| Andrew Goodbody |
55 |
4.96% |
1 |
3.85% |
| Yuyang Du |
31 |
2.80% |
2 |
7.69% |
| Nobuo Iwata |
20 |
1.80% |
1 |
3.85% |
| Shuah Khan |
19 |
1.71% |
1 |
3.85% |
| Stefan Reif |
16 |
1.44% |
1 |
3.85% |
| Matt Mooney |
16 |
1.44% |
3 |
11.54% |
| Arnd Bergmann |
12 |
1.08% |
1 |
3.85% |
| Brian G. Merrell |
9 |
0.81% |
1 |
3.85% |
| Arjan Mels |
7 |
0.63% |
1 |
3.85% |
| Greg Kroah-Hartman |
6 |
0.54% |
3 |
11.54% |
| Bart Westgeest |
3 |
0.27% |
3 |
11.54% |
| Tejun Heo |
2 |
0.18% |
1 |
3.85% |
| Kurt Kanzenbach |
1 |
0.09% |
1 |
3.85% |
| Christopher Harvey |
1 |
0.09% |
1 |
3.85% |
| Colin Ian King |
1 |
0.09% |
1 |
3.85% |
| Total |
1109 |
|
26 |
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*/
#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 seqnum %u\n", seqnum);
switch (status) {
case -ENOENT:
/* fall through */
case -ECONNRESET:
dev_dbg(&urb->dev->dev,
"urb seq# %u was unlinked %ssynchronously\n",
seqnum, status == -ENOENT ? "" : "a");
break;
case -EINPROGRESS:
/* no info output */
break;
default:
dev_dbg(&urb->dev->dev,
"urb seq# %u may be in a error, status %d\n",
seqnum, 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 vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
struct vhci *vhci = vhci_hcd->vhci;
struct usbip_device *ud = &vdev->ud;
struct urb *urb;
unsigned long flags;
spin_lock_irqsave(&vdev->priv_lock, flags);
urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
spin_unlock_irqrestore(&vdev->priv_lock, flags);
if (!urb) {
pr_err("cannot find a urb of seqnum %u max seqnum %d\n",
pdu->base.seqnum,
atomic_read(&vhci_hcd->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 %u\n", pdu->base.seqnum);
spin_lock_irqsave(&vhci->lock, flags);
usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb);
spin_unlock_irqrestore(&vhci->lock, flags);
usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), 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;
unsigned long flags;
spin_lock_irqsave(&vdev->priv_lock, flags);
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_irqrestore(&vdev->priv_lock, flags);
return unlink;
}
}
spin_unlock_irqrestore(&vdev->priv_lock, flags);
return NULL;
}
static void vhci_recv_ret_unlink(struct vhci_device *vdev,
struct usbip_header *pdu)
{
struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
struct vhci *vhci = vhci_hcd->vhci;
struct vhci_unlink *unlink;
struct urb *urb;
unsigned long flags;
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_irqsave(&vdev->priv_lock, flags);
urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
spin_unlock_irqrestore(&vdev->priv_lock, flags);
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 %d\n", pdu->base.seqnum);
/* If unlink is successful, status is -ECONNRESET */
urb->status = pdu->u.ret_unlink.status;
pr_info("urb->status %d\n", urb->status);
spin_lock_irqsave(&vhci->lock, flags);
usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb);
spin_unlock_irqrestore(&vhci->lock, flags);
usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status);
}
kfree(unlink);
}
static int vhci_priv_tx_empty(struct vhci_device *vdev)
{
int empty = 0;
unsigned long flags;
spin_lock_irqsave(&vdev->priv_lock, flags);
empty = list_empty(&vdev->priv_rx);
spin_unlock_irqrestore(&vdev->priv_lock, flags);
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;
}