1 /*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 *
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 */
19
20 #include <linux/kthread.h>
21 #include <linux/slab.h>
22
23 #include "usbip_common.h"
24 #include "vhci.h"
25
setup_cmd_submit_pdu(struct usbip_header * pdup,struct urb * urb)26 static void setup_cmd_submit_pdu(struct usbip_header *pdup, struct urb *urb)
27 {
28 struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
29 struct vhci_device *vdev = priv->vdev;
30
31 usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
32 usb_pipedevice(urb->pipe), vdev->devid);
33
34 pdup->base.command = USBIP_CMD_SUBMIT;
35 pdup->base.seqnum = priv->seqnum;
36 pdup->base.devid = vdev->devid;
37 pdup->base.direction = usb_pipein(urb->pipe) ?
38 USBIP_DIR_IN : USBIP_DIR_OUT;
39 pdup->base.ep = usb_pipeendpoint(urb->pipe);
40
41 usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);
42
43 if (urb->setup_packet)
44 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
45 }
46
dequeue_from_priv_tx(struct vhci_device * vdev)47 static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
48 {
49 unsigned long flags;
50 struct vhci_priv *priv, *tmp;
51
52 spin_lock_irqsave(&vdev->priv_lock, flags);
53
54 list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
55 list_move_tail(&priv->list, &vdev->priv_rx);
56 spin_unlock_irqrestore(&vdev->priv_lock, flags);
57 return priv;
58 }
59
60 spin_unlock_irqrestore(&vdev->priv_lock, flags);
61
62 return NULL;
63 }
64
vhci_send_cmd_submit(struct vhci_device * vdev)65 static int vhci_send_cmd_submit(struct vhci_device *vdev)
66 {
67 struct vhci_priv *priv = NULL;
68
69 struct msghdr msg;
70 struct kvec iov[3];
71 size_t txsize;
72
73 size_t total_size = 0;
74
75 while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
76 int ret;
77 struct urb *urb = priv->urb;
78 struct usbip_header pdu_header;
79 void *iso_buffer = NULL;
80
81 txsize = 0;
82 memset(&pdu_header, 0, sizeof(pdu_header));
83 memset(&msg, 0, sizeof(msg));
84 memset(&iov, 0, sizeof(iov));
85
86 usbip_dbg_vhci_tx("setup txdata urb %p\n", urb);
87
88 /* 1. setup usbip_header */
89 setup_cmd_submit_pdu(&pdu_header, urb);
90 usbip_header_correct_endian(&pdu_header, 1);
91
92 iov[0].iov_base = &pdu_header;
93 iov[0].iov_len = sizeof(pdu_header);
94 txsize += sizeof(pdu_header);
95
96 /* 2. setup transfer buffer */
97 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
98 iov[1].iov_base = urb->transfer_buffer;
99 iov[1].iov_len = urb->transfer_buffer_length;
100 txsize += urb->transfer_buffer_length;
101 }
102
103 /* 3. setup iso_packet_descriptor */
104 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
105 ssize_t len = 0;
106
107 iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
108 if (!iso_buffer) {
109 usbip_event_add(&vdev->ud,
110 SDEV_EVENT_ERROR_MALLOC);
111 return -1;
112 }
113
114 iov[2].iov_base = iso_buffer;
115 iov[2].iov_len = len;
116 txsize += len;
117 }
118
119 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
120 if (ret != txsize) {
121 pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
122 txsize);
123 kfree(iso_buffer);
124 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
125 return -1;
126 }
127
128 kfree(iso_buffer);
129 usbip_dbg_vhci_tx("send txdata\n");
130
131 total_size += txsize;
132 }
133
134 return total_size;
135 }
136
dequeue_from_unlink_tx(struct vhci_device * vdev)137 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
138 {
139 unsigned long flags;
140 struct vhci_unlink *unlink, *tmp;
141
142 spin_lock_irqsave(&vdev->priv_lock, flags);
143
144 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
145 list_move_tail(&unlink->list, &vdev->unlink_rx);
146 spin_unlock_irqrestore(&vdev->priv_lock, flags);
147 return unlink;
148 }
149
150 spin_unlock_irqrestore(&vdev->priv_lock, flags);
151
152 return NULL;
153 }
154
vhci_send_cmd_unlink(struct vhci_device * vdev)155 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
156 {
157 struct vhci_unlink *unlink = NULL;
158
159 struct msghdr msg;
160 struct kvec iov[3];
161 size_t txsize;
162
163 size_t total_size = 0;
164
165 while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
166 int ret;
167 struct usbip_header pdu_header;
168
169 txsize = 0;
170 memset(&pdu_header, 0, sizeof(pdu_header));
171 memset(&msg, 0, sizeof(msg));
172 memset(&iov, 0, sizeof(iov));
173
174 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
175
176 /* 1. setup usbip_header */
177 pdu_header.base.command = USBIP_CMD_UNLINK;
178 pdu_header.base.seqnum = unlink->seqnum;
179 pdu_header.base.devid = vdev->devid;
180 pdu_header.base.ep = 0;
181 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
182
183 usbip_header_correct_endian(&pdu_header, 1);
184
185 iov[0].iov_base = &pdu_header;
186 iov[0].iov_len = sizeof(pdu_header);
187 txsize += sizeof(pdu_header);
188
189 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
190 if (ret != txsize) {
191 pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
192 txsize);
193 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
194 return -1;
195 }
196
197 usbip_dbg_vhci_tx("send txdata\n");
198
199 total_size += txsize;
200 }
201
202 return total_size;
203 }
204
vhci_tx_loop(void * data)205 int vhci_tx_loop(void *data)
206 {
207 struct usbip_device *ud = data;
208 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
209
210 while (!kthread_should_stop()) {
211 if (vhci_send_cmd_submit(vdev) < 0)
212 break;
213
214 if (vhci_send_cmd_unlink(vdev) < 0)
215 break;
216
217 wait_event_interruptible(vdev->waitq_tx,
218 (!list_empty(&vdev->priv_tx) ||
219 !list_empty(&vdev->unlink_tx) ||
220 kthread_should_stop()));
221
222 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
223 }
224
225 return 0;
226 }
227