1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
// 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 int alloc_urb_from_cmd(struct urb **urbp,
struct usbip_header *pdu, u8 type)
{
struct urb *urb;
if (type == USB_ENDPOINT_XFER_ISOC)
urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
GFP_KERNEL);
else
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
goto err;
usbip_pack_pdu(pdu, urb, USBIP_CMD_SUBMIT, 0);
if (urb->transfer_buffer_length > 0) {
urb->transfer_buffer = kzalloc(urb->transfer_buffer_length,
GFP_KERNEL);
if (!urb->transfer_buffer)
goto free_urb;
}
urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
GFP_KERNEL);
if (!urb->setup_packet)
goto free_buffer;
/*
* FIXME - we only setup pipe enough for usbip functions
* to behave nicely
*/
urb->pipe |= pdu->base.direction == USBIP_DIR_IN ?
USB_DIR_IN : USB_DIR_OUT;
*urbp = urb;
return 0;
free_buffer:
kfree(urb->transfer_buffer);
urb->transfer_buffer = NULL;
free_urb:
usb_free_urb(urb);
err:
return -ENOMEM;
}
static int v_recv_cmd_unlink(struct vudc *udc,
struct usbip_header *pdu)
{
unsigned long flags;
struct urbp *urb_p;
spin_lock_irqsave(&udc->lock, flags);
list_for_each_entry(urb_p, &udc->urb_queue, urb_entry) {
if (urb_p->seqnum != pdu->u.cmd_unlink.seqnum)
continue;
urb_p->urb->unlinked = -ECONNRESET;
urb_p->seqnum = pdu->base.seqnum;
v_kick_timer(udc, jiffies);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
/* Not found, completed / not queued */
spin_lock(&udc->lock_tx);
v_enqueue_ret_unlink(udc, pdu->base.seqnum, 0);
wake_up(&udc->tx_waitq);
spin_unlock(&udc->lock_tx);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int v_recv_cmd_submit(struct vudc *udc,
struct usbip_header *pdu)
{
int ret = 0;
struct urbp *urb_p;
u8 address;
unsigned long flags;
urb_p = alloc_urbp();
if (!urb_p) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
return -ENOMEM;
}
/* base.ep is pipeendpoint(pipe) */
address = pdu->base.ep;
if (pdu->base.direction == USBIP_DIR_IN)
address |= USB_DIR_IN;
spin_lock_irq(&udc->lock);
urb_p->ep = vudc_find_endpoint(udc, address);
if (!urb_p->ep) {
/* we don't know the type, there may be isoc data! */
dev_err(&udc->pdev->dev, "request to nonexistent endpoint");
spin_unlock_irq(&udc->lock);
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
ret = -EPIPE;
goto free_urbp;
}
urb_p->type = urb_p->ep->type;
spin_unlock_irq(&udc->lock);
urb_p->new = 1;
urb_p->seqnum = pdu->base.seqnum;
if (urb_p->ep->type == USB_ENDPOINT_XFER_ISOC) {
/* validate packet size and number of packets */
unsigned int maxp, packets, bytes;
maxp = usb_endpoint_maxp(urb_p->ep->desc);
maxp *= usb_endpoint_maxp_mult(urb_p->ep->desc);
bytes = pdu->u.cmd_submit.transfer_buffer_length;
packets = DIV_ROUND_UP(bytes, maxp);
if (pdu->u.cmd_submit.number_of_packets < 0 ||
pdu->u.cmd_submit.number_of_packets > packets) {
dev_err(&udc->gadget.dev,
"CMD_SUBMIT: isoc invalid num packets %d\n",
pdu->u.cmd_submit.number_of_packets);
ret = -EMSGSIZE;
goto free_urbp;
}
}
ret = alloc_urb_from_cmd(&urb_p->urb, pdu, urb_p->ep->type);
if (ret) {
usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
ret = -ENOMEM;
goto free_urbp;
}
urb_p->urb->status = -EINPROGRESS;
/* FIXME: more pipe setup to please usbip_common */
urb_p->urb->pipe &= ~(3 << 30);
switch (urb_p->ep->type) {
case USB_ENDPOINT_XFER_BULK:
urb_p->urb->pipe |= (PIPE_BULK << 30);
break;
case USB_ENDPOINT_XFER_INT:
urb_p->urb->pipe |= (PIPE_INTERRUPT << 30);
break;
case USB_ENDPOINT_XFER_CONTROL:
urb_p->urb->pipe |= (PIPE_CONTROL << 30);
break;
case USB_ENDPOINT_XFER_ISOC:
urb_p->urb->pipe |= (PIPE_ISOCHRONOUS << 30);
break;
}
ret = usbip_recv_xbuff(&udc->ud, urb_p->urb);
if (ret < 0)
goto free_urbp;
ret = usbip_recv_iso(&udc->ud, urb_p->urb);
if (ret < 0)
goto free_urbp;
spin_lock_irqsave(&udc->lock, flags);
v_kick_timer(udc, jiffies);
list_add_tail(&urb_p->urb_entry, &udc->urb_queue);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
free_urbp:
free_urbp_and_urb(urb_p);
return ret;
}
static int v_rx_pdu(struct usbip_device *ud)
{
int ret;
struct usbip_header pdu;
struct vudc *udc = container_of(ud, struct vudc, ud);
memset(&pdu, 0, sizeof(pdu));
ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
if (ret != sizeof(pdu)) {
usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
if (ret >= 0)
return -EPIPE;
return ret;
}
usbip_header_correct_endian(&pdu, 0);
spin_lock_irq(&ud->lock);
ret = (ud->status == SDEV_ST_USED);
spin_unlock_irq(&ud->lock);
if (!ret) {
usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
return -EBUSY;
}
switch (pdu.base.command) {
case USBIP_CMD_UNLINK:
ret = v_recv_cmd_unlink(udc, &pdu);
break;
case USBIP_CMD_SUBMIT:
ret = v_recv_cmd_submit(udc, &pdu);
break;
default:
ret = -EPIPE;
pr_err("rx: unknown command");
break;
}
return ret;
}
int v_rx_loop(void *data)
{
struct usbip_device *ud = data;
int ret = 0;
while (!kthread_should_stop()) {
if (usbip_event_happened(ud))
break;
ret = v_rx_pdu(ud);
if (ret < 0) {
pr_warn("v_rx exit with error %d", ret);
break;
}
}
return ret;
}
|
