- 根目录:
- drivers
- usb
- usbip
- stub_tx.c
#include <linux/kthread.h>
#include <linux/socket.h>
#include "usbip_common.h"
#include "stub.h"
static void stub_free_priv_and_urb(struct stub_priv *priv)
{
struct urb *urb = priv->urb;
kfree(urb->setup_packet);
kfree(urb->transfer_buffer);
list_del(&priv->list);
kmem_cache_free(stub_priv_cache, priv);
usb_free_urb(urb);
}
void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
__u32 status)
{
struct stub_unlink *unlink;
unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC);
if (!unlink) {
usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC);
return;
}
unlink->seqnum = seqnum;
unlink->status = status;
list_add_tail(&unlink->list, &sdev->unlink_tx);
}
void stub_complete(struct urb *urb)
{
struct stub_priv *priv = (struct stub_priv *) urb->context;
struct stub_device *sdev = priv->sdev;
unsigned long flags;
usbip_dbg_stub_tx("complete! status %d\n", urb->status);
switch (urb->status) {
case 0:
break;
case -ENOENT:
dev_info(&urb->dev->dev,
"stopped by a call to usb_kill_urb() because of cleaning up a virtual connection\n");
return;
case -ECONNRESET:
dev_info(&urb->dev->dev,
"unlinked by a call to usb_unlink_urb()\n");
break;
case -EPIPE:
dev_info(&urb->dev->dev, "endpoint %d is stalled\n",
usb_pipeendpoint(urb->pipe));
break;
case -ESHUTDOWN:
dev_info(&urb->dev->dev, "device removed?\n");
break;
default:
dev_info(&urb->dev->dev,
"urb completion with non-zero status %d\n",
urb->status);
break;
}
spin_lock_irqsave(&sdev->priv_lock, flags);
if (priv->unlinking) {
stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status);
stub_free_priv_and_urb(priv);
} else {
list_move_tail(&priv->list, &sdev->priv_tx);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
wake_up(&sdev->tx_waitq);
}
static inline void setup_base_pdu(struct usbip_header_basic *base,
__u32 command, __u32 seqnum)
{
base->command = command;
base->seqnum = seqnum;
base->devid = 0;
base->ep = 0;
base->direction = 0;
}
static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb)
{
struct stub_priv *priv = (struct stub_priv *) urb->context;
setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum);
usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1);
}
static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
struct stub_unlink *unlink)
{
setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
rpdu->u.ret_unlink.status = unlink->status;
}
static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv, *tmp;
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) {
list_move_tail(&priv->list, &sdev->priv_free);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
static int stub_send_ret_submit(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv, *tmp;
struct msghdr msg;
size_t txsize;
size_t total_size = 0;
while ((priv = dequeue_from_priv_tx(sdev)) != NULL) {
int ret;
struct urb *urb = priv->urb;
struct usbip_header pdu_header;
struct usbip_iso_packet_descriptor *iso_buffer = NULL;
struct kvec *iov = NULL;
int iovnum = 0;
txsize = 0;
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
iovnum = 2 + urb->number_of_packets;
else
iovnum = 2;
iov = kcalloc(iovnum, sizeof(struct kvec), GFP_KERNEL);
if (!iov) {
usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC);
return -1;
}
iovnum = 0;
setup_ret_submit_pdu(&pdu_header, urb);
usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n",
pdu_header.base.seqnum, urb);
usbip_header_correct_endian(&pdu_header, 1);
iov[iovnum].iov_base = &pdu_header;
iov[iovnum].iov_len = sizeof(pdu_header);
iovnum++;
txsize += sizeof(pdu_header);
if (usb_pipein(urb->pipe) &&
usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS &&
urb->actual_length > 0) {
iov[iovnum].iov_base = urb->transfer_buffer;
iov[iovnum].iov_len = urb->actual_length;
iovnum++;
txsize += urb->actual_length;
} else if (usb_pipein(urb->pipe) &&
usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
int i;
for (i = 0; i < urb->number_of_packets; i++) {
iov[iovnum].iov_base = urb->transfer_buffer +
urb->iso_frame_desc[i].offset;
iov[iovnum].iov_len =
urb->iso_frame_desc[i].actual_length;
iovnum++;
txsize += urb->iso_frame_desc[i].actual_length;
}
if (txsize != sizeof(pdu_header) + urb->actual_length) {
dev_err(&sdev->interface->dev,
"actual length of urb %d does not match iso packet sizes %zu\n",
urb->actual_length,
txsize-sizeof(pdu_header));
kfree(iov);
usbip_event_add(&sdev->ud,
SDEV_EVENT_ERROR_TCP);
return -1;
}
}
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
ssize_t len = 0;
iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
if (!iso_buffer) {
usbip_event_add(&sdev->ud,
SDEV_EVENT_ERROR_MALLOC);
kfree(iov);
return -1;
}
iov[iovnum].iov_base = iso_buffer;
iov[iovnum].iov_len = len;
txsize += len;
iovnum++;
}
ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg,
iov, iovnum, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
ret, txsize);
kfree(iov);
kfree(iso_buffer);
usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
return -1;
}
kfree(iov);
kfree(iso_buffer);
total_size += txsize;
}
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) {
stub_free_priv_and_urb(priv);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return total_size;
}
static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev)
{
unsigned long flags;
struct stub_unlink *unlink, *tmp;
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
list_move_tail(&unlink->list, &sdev->unlink_free);
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return unlink;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
static int stub_send_ret_unlink(struct stub_device *sdev)
{
unsigned long flags;
struct stub_unlink *unlink, *tmp;
struct msghdr msg;
struct kvec iov[1];
size_t txsize;
size_t total_size = 0;
while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) {
int ret;
struct usbip_header pdu_header;
txsize = 0;
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
memset(&iov, 0, sizeof(iov));
usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum);
setup_ret_unlink_pdu(&pdu_header, unlink);
usbip_header_correct_endian(&pdu_header, 1);
iov[0].iov_base = &pdu_header;
iov[0].iov_len = sizeof(pdu_header);
txsize += sizeof(pdu_header);
ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
1, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
ret, txsize);
usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
return -1;
}
usbip_dbg_stub_tx("send txdata\n");
total_size += txsize;
}
spin_lock_irqsave(&sdev->priv_lock, flags);
list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) {
list_del(&unlink->list);
kfree(unlink);
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return total_size;
}
int stub_tx_loop(void *data)
{
struct usbip_device *ud = data;
struct stub_device *sdev = container_of(ud, struct stub_device, ud);
while (!kthread_should_stop()) {
if (usbip_event_happened(ud))
break;
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;
}
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