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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
* Copyright (C) 2015-2016 Samsung Electronics
* Igor Kotrasinski <i.kotrasinsk@samsung.com>
*/
#include <net/sock.h>
#include <linux/list.h>
#include <linux/kthread.h>
#include "usbip_common.h"
#include "vudc.h"
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 urbp *urb_p)
{
setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, urb_p->seqnum);
usbip_pack_pdu(rpdu, urb_p->urb, USBIP_RET_SUBMIT, 1);
}
static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
struct v_unlink *unlink)
{
setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
rpdu->u.ret_unlink.status = unlink->status;
}
static int v_send_ret_unlink(struct vudc *udc, struct v_unlink *unlink)
{
struct msghdr msg;
struct kvec iov[1];
size_t txsize;
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));
/* 1. setup usbip_header */
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(udc->ud.tcp_socket, &msg, iov,
1, txsize);
if (ret != txsize) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
if (ret >= 0)
return -EPIPE;
return ret;
}
kfree(unlink);
return txsize;
}
static int v_send_ret_submit(struct vudc *udc, struct urbp *urb_p)
{
struct urb *urb = urb_p->urb;
struct usbip_header pdu_header;
struct usbip_iso_packet_descriptor *iso_buffer = NULL;
struct kvec *iov = NULL;
int iovnum = 0;
int ret = 0;
size_t txsize;
struct msghdr msg;
txsize = 0;
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
if (urb_p->type == USB_ENDPOINT_XFER_ISOC)
iovnum = 2 + urb->number_of_packets;
else
iovnum = 2;
iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL);
if (!iov) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
ret = -ENOMEM;
goto out;
}
iovnum = 0;
/* 1. setup usbip_header */
setup_ret_submit_pdu(&pdu_header, urb_p);
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);
/* 2. setup transfer buffer */
if (urb_p->type != USB_ENDPOINT_XFER_ISOC &&
usb_pipein(urb->pipe) && 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 (urb_p->type == USB_ENDPOINT_XFER_ISOC &&
usb_pipein(urb->pipe)) {
/* FIXME - copypasted from stub_tx, refactor */
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) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
ret = -EPIPE;
goto out;
}
}
/* else - no buffer to send */
/* 3. setup iso_packet_descriptor */
if (urb_p->type == USB_ENDPOINT_XFER_ISOC) {
ssize_t len = 0;
iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
if (!iso_buffer) {
usbip_event_add(&udc->ud,
VUDC_EVENT_ERROR_MALLOC);
ret = -ENOMEM;
goto out;
}
iov[iovnum].iov_base = iso_buffer;
iov[iovnum].iov_len = len;
txsize += len;
iovnum++;
}
ret = kernel_sendmsg(udc->ud.tcp_socket, &msg,
iov, iovnum, txsize);
if (ret != txsize) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
if (ret >= 0)
ret = -EPIPE;
goto out;
}
out:
kfree(iov);
kfree(iso_buffer);
free_urbp_and_urb(urb_p);
if (ret < 0)
return ret;
return txsize;
}
static int v_send_ret(struct vudc *udc)
{
unsigned long flags;
struct tx_item *txi;
size_t total_size = 0;
int ret = 0;
spin_lock_irqsave(&udc->lock_tx, flags);
while (!list_empty(&udc->tx_queue)) {
txi = list_first_entry(&udc->tx_queue, struct tx_item,
tx_entry);
list_del(&txi->tx_entry);
spin_unlock_irqrestore(&udc->lock_tx, flags);
switch (txi->type) {
case TX_SUBMIT:
ret = v_send_ret_submit(udc, txi->s);
break;
case TX_UNLINK:
ret = v_send_ret_unlink(udc, txi->u);
break;
}
kfree(txi);
if (ret < 0)
return ret;
total_size += ret;
spin_lock_irqsave(&udc->lock_tx, flags);
}
spin_unlock_irqrestore(&udc->lock_tx, flags);
return total_size;
}
int v_tx_loop(void *data)
{
struct usbip_device *ud = (struct usbip_device *) data;
struct vudc *udc = container_of(ud, struct vudc, ud);
int ret;
while (!kthread_should_stop()) {
if (usbip_event_happened(&udc->ud))
break;
ret = v_send_ret(udc);
if (ret < 0) {
pr_warn("v_tx exit with error %d", ret);
break;
}
wait_event_interruptible(udc->tx_waitq,
(!list_empty(&udc->tx_queue) ||
kthread_should_stop()));
}
return 0;
}
/* called with spinlocks held */
void v_enqueue_ret_unlink(struct vudc *udc, __u32 seqnum, __u32 status)
{
struct tx_item *txi;
struct v_unlink *unlink;
txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
if (!txi) {
usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
return;
}
unlink = kzalloc(sizeof(*unlink), GFP_ATOMIC);
if (!unlink) {
kfree(txi);
usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
return;
}
unlink->seqnum = seqnum;
unlink->status = status;
txi->type = TX_UNLINK;
txi->u = unlink;
list_add_tail(&txi->tx_entry, &udc->tx_queue);
}
/* called with spinlocks held */
void v_enqueue_ret_submit(struct vudc *udc, struct urbp *urb_p)
{
struct tx_item *txi;
txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
if (!txi) {
usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
return;
}
txi->type = TX_SUBMIT;
txi->s = urb_p;
list_add_tail(&txi->tx_entry, &udc->tx_queue);
}
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