3 * Copyright (C) 2015-2016 Samsung Electronics
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/list.h>
22 #include <linux/kthread.h>
24 #include "usbip_common.h"
27 static int alloc_urb_from_cmd(struct urb **urbp,
28 struct usbip_header *pdu, u8 type)
32 if (type == USB_ENDPOINT_XFER_ISOC)
33 urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
36 urb = usb_alloc_urb(0, GFP_KERNEL);
41 usbip_pack_pdu(pdu, urb, USBIP_CMD_SUBMIT, 0);
43 if (urb->transfer_buffer_length > 0) {
44 urb->transfer_buffer = kzalloc(urb->transfer_buffer_length,
46 if (!urb->transfer_buffer)
50 urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
52 if (!urb->setup_packet)
56 * FIXME - we only setup pipe enough for usbip functions
59 urb->pipe |= pdu->base.direction == USBIP_DIR_IN ?
60 USB_DIR_IN : USB_DIR_OUT;
66 kfree(urb->transfer_buffer);
67 urb->transfer_buffer = NULL;
74 static int v_recv_cmd_unlink(struct vudc *udc,
75 struct usbip_header *pdu)
80 spin_lock_irqsave(&udc->lock, flags);
81 list_for_each_entry(urb_p, &udc->urb_queue, urb_entry) {
82 if (urb_p->seqnum != pdu->u.cmd_unlink.seqnum)
84 urb_p->urb->unlinked = -ECONNRESET;
85 urb_p->seqnum = pdu->base.seqnum;
86 v_kick_timer(udc, jiffies);
87 spin_unlock_irqrestore(&udc->lock, flags);
90 /* Not found, completed / not queued */
91 spin_lock(&udc->lock_tx);
92 v_enqueue_ret_unlink(udc, pdu->base.seqnum, 0);
93 wake_up(&udc->tx_waitq);
94 spin_unlock(&udc->lock_tx);
95 spin_unlock_irqrestore(&udc->lock, flags);
100 static int v_recv_cmd_submit(struct vudc *udc,
101 struct usbip_header *pdu)
108 urb_p = alloc_urbp();
110 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
114 /* base.ep is pipeendpoint(pipe) */
115 address = pdu->base.ep;
116 if (pdu->base.direction == USBIP_DIR_IN)
117 address |= USB_DIR_IN;
119 spin_lock_irq(&udc->lock);
120 urb_p->ep = vudc_find_endpoint(udc, address);
122 /* we don't know the type, there may be isoc data! */
123 dev_err(&udc->pdev->dev, "request to nonexistent endpoint");
124 spin_unlock_irq(&udc->lock);
125 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
129 urb_p->type = urb_p->ep->type;
130 spin_unlock_irq(&udc->lock);
133 urb_p->seqnum = pdu->base.seqnum;
135 ret = alloc_urb_from_cmd(&urb_p->urb, pdu, urb_p->ep->type);
137 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
142 urb_p->urb->status = -EINPROGRESS;
144 /* FIXME: more pipe setup to please usbip_common */
145 urb_p->urb->pipe &= ~(3 << 30);
146 switch (urb_p->ep->type) {
147 case USB_ENDPOINT_XFER_BULK:
148 urb_p->urb->pipe |= (PIPE_BULK << 30);
150 case USB_ENDPOINT_XFER_INT:
151 urb_p->urb->pipe |= (PIPE_INTERRUPT << 30);
153 case USB_ENDPOINT_XFER_CONTROL:
154 urb_p->urb->pipe |= (PIPE_CONTROL << 30);
156 case USB_ENDPOINT_XFER_ISOC:
157 urb_p->urb->pipe |= (PIPE_ISOCHRONOUS << 30);
160 ret = usbip_recv_xbuff(&udc->ud, urb_p->urb);
164 ret = usbip_recv_iso(&udc->ud, urb_p->urb);
168 spin_lock_irqsave(&udc->lock, flags);
169 v_kick_timer(udc, jiffies);
170 list_add_tail(&urb_p->urb_entry, &udc->urb_queue);
171 spin_unlock_irqrestore(&udc->lock, flags);
176 free_urbp_and_urb(urb_p);
180 static int v_rx_pdu(struct usbip_device *ud)
183 struct usbip_header pdu;
184 struct vudc *udc = container_of(ud, struct vudc, ud);
186 memset(&pdu, 0, sizeof(pdu));
187 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
188 if (ret != sizeof(pdu)) {
189 usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
194 usbip_header_correct_endian(&pdu, 0);
196 spin_lock_irq(&ud->lock);
197 ret = (ud->status == SDEV_ST_USED);
198 spin_unlock_irq(&ud->lock);
200 usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
204 switch (pdu.base.command) {
205 case USBIP_CMD_UNLINK:
206 ret = v_recv_cmd_unlink(udc, &pdu);
208 case USBIP_CMD_SUBMIT:
209 ret = v_recv_cmd_submit(udc, &pdu);
213 pr_err("rx: unknown command");
219 int v_rx_loop(void *data)
221 struct usbip_device *ud = data;
224 while (!kthread_should_stop()) {
225 if (usbip_event_happened(ud))
229 pr_warn("v_rx exit with error %d", ret);