static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
__u32 port = 0, pdev_nr = 0, rhport = 0;
struct usb_hcd *hcd;
int ret;
if (kstrtoint(buf, 10, &port) < 0)
return -EINVAL;
pdev_nr = port_to_pdev_nr(port);
rhport = port_to_rhport(port);
if (!valid_port(pdev_nr, rhport))
return -EINVAL;
hcd = platform_get_drvdata(*(vhci_pdevs + pdev_nr));
if (hcd == NULL) {
dev_err(dev, "port is not ready %u\n", port);
return -EAGAIN;
}
ret = vhci_port_disconnect(hcd_to_vhci(hcd), rhport);
if (ret < 0)
return -EINVAL;
usbip_dbg_vhci_sysfs("Leave\n");
return count;
}
static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
__u32 port = 0, pdev_nr = 0, rhport = 0;
struct usb_hcd *hcd;
struct vhci_hcd *vhci_hcd;
int ret;
if (kstrtoint(buf, 10, &port) < 0)
return -EINVAL;
pdev_nr = port_to_pdev_nr(port);
rhport = port_to_rhport(port);
if (!valid_port(pdev_nr, rhport))
return -EINVAL;
hcd = platform_get_drvdata(vhcis[pdev_nr].pdev);
if (hcd == NULL) {
dev_err(dev, "port is not ready %u\n", port);
return -EAGAIN;
}
usbip_dbg_vhci_sysfs("rhport %d\n", rhport);
if ((port / VHCI_HC_PORTS) % 2)
vhci_hcd = hcd_to_vhci_hcd(hcd)->vhci->vhci_hcd_ss;
else
vhci_hcd = hcd_to_vhci_hcd(hcd)->vhci->vhci_hcd_hs;
ret = vhci_port_disconnect(vhci_hcd, rhport);
if (ret < 0)
return -EINVAL;
usbip_dbg_vhci_sysfs("Leave\n");
return count;
}
/*
* To start a new USB/IP attachment, a userland program needs to setup a TCP
* connection and then write its socket descriptor with remote device
* information into this sysfs file.
*
* A remote device is virtually attached to the root-hub port of @rhport with
* @speed. @devid is embedded into a request to specify the remote device in a
* server host.
*
* write() returns 0 on success, else negative errno.
*/
static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct socket *socket;
int sockfd = 0;
__u32 port = 0, pdev_nr = 0, rhport = 0, devid = 0, speed = 0;
struct usb_hcd *hcd;
struct vhci_hcd *vhci_hcd;
struct vhci_device *vdev;
struct vhci *vhci;
int err;
unsigned long flags;
/*
* @rhport: port number of vhci_hcd
* @sockfd: socket descriptor of an established TCP connection
* @devid: unique device identifier in a remote host
* @speed: usb device speed in a remote host
*/
if (sscanf(buf, "%u %u %u %u", &port, &sockfd, &devid, &speed) != 4)
return -EINVAL;
pdev_nr = port_to_pdev_nr(port);
rhport = port_to_rhport(port);
usbip_dbg_vhci_sysfs("port(%u) pdev(%d) rhport(%u)\n",
port, pdev_nr, rhport);
usbip_dbg_vhci_sysfs("sockfd(%u) devid(%u) speed(%u)\n",
sockfd, devid, speed);
/* check received parameters */
if (!valid_args(pdev_nr, rhport, speed))
return -EINVAL;
hcd = platform_get_drvdata(vhcis[pdev_nr].pdev);
if (hcd == NULL) {
dev_err(dev, "port %d is not ready\n", port);
return -EAGAIN;
}
vhci_hcd = hcd_to_vhci_hcd(hcd);
vhci = vhci_hcd->vhci;
if (speed == USB_SPEED_SUPER)
vdev = &vhci->vhci_hcd_ss->vdev[rhport];
else
vdev = &vhci->vhci_hcd_hs->vdev[rhport];
/* Extract socket from fd. */
socket = sockfd_lookup(sockfd, &err);
if (!socket)
return -EINVAL;
/* now need lock until setting vdev status as used */
/* begin a lock */
spin_lock_irqsave(&vhci->lock, flags);
spin_lock(&vdev->ud.lock);
if (vdev->ud.status != VDEV_ST_NULL) {
/* end of the lock */
spin_unlock(&vdev->ud.lock);
spin_unlock_irqrestore(&vhci->lock, flags);
sockfd_put(socket);
dev_err(dev, "port %d already used\n", rhport);
return -EINVAL;
}
dev_info(dev, "pdev(%u) rhport(%u) sockfd(%d)\n",
pdev_nr, rhport, sockfd);
dev_info(dev, "devid(%u) speed(%u) speed_str(%s)\n",
devid, speed, usb_speed_string(speed));
vdev->devid = devid;
vdev->speed = speed;
vdev->ud.tcp_socket = socket;
vdev->ud.status = VDEV_ST_NOTASSIGNED;
spin_unlock(&vdev->ud.lock);
spin_unlock_irqrestore(&vhci->lock, flags);
/* end the lock */
vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
rh_port_connect(vdev, speed);
return count;
}
