aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/usbip/vhci_tx.c
blob: 682127d258fdd56f8798784269e105b2567b7654 (plain)
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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/scatterlist.h>

#include "usbip_common.h"
#include "vhci.h"

static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
{
	struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
	struct vhci_device *vdev = priv->vdev;

	usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
			  usb_pipedevice(urb->pipe), vdev->devid);

	pdup->base.command   = USBIP_CMD_SUBMIT;
	pdup->base.seqnum    = priv->seqnum;
	pdup->base.devid     = vdev->devid;
	pdup->base.direction = usb_pipein(urb->pipe) ?
		USBIP_DIR_IN : USBIP_DIR_OUT;
	pdup->base.ep	     = usb_pipeendpoint(urb->pipe);

	usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);

	if (urb->setup_packet)
		memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
}

static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
{
	struct vhci_priv *priv, *tmp;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);

	list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
		list_move_tail(&priv->list, &vdev->priv_rx);
		spin_unlock_irqrestore(&vdev->priv_lock, flags);
		return priv;
	}

	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	return NULL;
}

static int vhci_send_cmd_submit(struct vhci_device *vdev)
{
	struct usbip_iso_packet_descriptor *iso_buffer = NULL;
	struct vhci_priv *priv = NULL;
	struct scatterlist *sg;

	struct msghdr msg;
	struct kvec *iov;
	size_t txsize;

	size_t total_size = 0;
	int iovnum;
	int err = -ENOMEM;
	int i;

	while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
		int ret;
		struct urb *urb = priv->urb;
		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_vhci_tx("setup txdata urb seqnum %lu\n",
				  priv->seqnum);

		if (urb->num_sgs && usb_pipeout(urb->pipe))
			iovnum = 2 + urb->num_sgs;
		else
			iovnum = 3;

		iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL);
		if (!iov) {
			usbip_event_add(&vdev->ud, SDEV_EVENT_ERROR_MALLOC);
			return -ENOMEM;
		}

		if (urb->num_sgs)
			urb->transfer_flags |= URB_DMA_MAP_SG;

		/* 1. setup usbip_header */
		setup_cmd_submit_pdu(&pdu_header, urb);
		usbip_header_correct_endian(&pdu_header, 1);
		iovnum = 0;

		iov[iovnum].iov_base = &pdu_header;
		iov[iovnum].iov_len  = sizeof(pdu_header);
		txsize += sizeof(pdu_header);
		iovnum++;

		/* 2. setup transfer buffer */
		if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
			if (urb->num_sgs &&
				      !usb_endpoint_xfer_isoc(&urb->ep->desc)) {
				for_each_sg(urb->sg, sg, urb->num_sgs, i) {
					iov[iovnum].iov_base = sg_virt(sg);
					iov[iovnum].iov_len = sg->length;
					iovnum++;
				}
			} else {
				iov[iovnum].iov_base = urb->transfer_buffer;
				iov[iovnum].iov_len  =
						urb->transfer_buffer_length;
				iovnum++;
			}
			txsize += urb->transfer_buffer_length;
		}

		/* 3. setup iso_packet_descriptor */
		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(&vdev->ud,
						SDEV_EVENT_ERROR_MALLOC);
				goto err_iso_buffer;
			}

			iov[iovnum].iov_base = iso_buffer;
			iov[iovnum].iov_len  = len;
			iovnum++;
			txsize += len;
		}

		ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, iovnum,
				     txsize);
		if (ret != txsize) {
			pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
			       txsize);
			usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
			err = -EPIPE;
			goto err_tx;
		}

		kfree(iov);
		/* This is only for isochronous case */
		kfree(iso_buffer);
		iso_buffer = NULL;

		usbip_dbg_vhci_tx("send txdata\n");

		total_size += txsize;
	}

	return total_size;

err_tx:
	kfree(iso_buffer);
err_iso_buffer:
	kfree(iov);

	return err;
}

static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
{
	struct vhci_unlink *unlink, *tmp;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);

	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
		list_move_tail(&unlink->list, &vdev->unlink_rx);
		spin_unlock_irqrestore(&vdev->priv_lock, flags);
		return unlink;
	}

	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	return NULL;
}

static int vhci_send_cmd_unlink(struct vhci_device *vdev)
{
	struct vhci_unlink *unlink = NULL;

	struct msghdr msg;
	struct kvec iov[3];
	size_t txsize;

	size_t total_size = 0;

	while ((unlink = dequeue_from_unlink_tx(vdev)) != 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_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);

		/* 1. setup usbip_header */
		pdu_header.base.command = USBIP_CMD_UNLINK;
		pdu_header.base.seqnum  = unlink->seqnum;
		pdu_header.base.devid	= vdev->devid;
		pdu_header.base.ep	= 0;
		pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;

		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(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
		if (ret != txsize) {
			pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
			       txsize);
			usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
			return -1;
		}

		usbip_dbg_vhci_tx("send txdata\n");

		total_size += txsize;
	}

	return total_size;
}

int vhci_tx_loop(void *data)
{
	struct usbip_device *ud = data;
	struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);

	while (!kthread_should_stop()) {
		if (vhci_send_cmd_submit(vdev) < 0)
			break;

		if (vhci_send_cmd_unlink(vdev) < 0)
			break;

		wait_event_interruptible(vdev->waitq_tx,
					 (!list_empty(&vdev->priv_tx) ||
					  !list_empty(&vdev->unlink_tx) ||
					  kthread_should_stop()));

		usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
	}

	return 0;
}