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 "usbip_common.h"
21 #include "vhci.h"
22
23
24 static void setup_cmd_submit_pdu(struct usbip_header *pdup, struct urb *urb)
25 {
26 struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
27 struct vhci_device *vdev = priv->vdev;
28
29 dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
30 usb_pipedevice(urb->pipe), vdev->devid);
31
32 pdup->base.command = USBIP_CMD_SUBMIT;
33 pdup->base.seqnum = priv->seqnum;
34 pdup->base.devid = vdev->devid;
35 if (usb_pipein(urb->pipe))
36 pdup->base.direction = USBIP_DIR_IN;
37 else
38 pdup->base.direction = 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
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
65
66
67 static int vhci_send_cmd_submit(struct vhci_device *vdev)
68 {
69 struct vhci_priv *priv = NULL;
70
71 struct msghdr msg;
72 struct kvec iov[3];
73 size_t txsize;
74
75 size_t total_size = 0;
76
77 while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
78 int ret;
79 struct urb *urb = priv->urb;
80 struct usbip_header pdu_header;
81 void *iso_buffer = NULL;
82
83 txsize = 0;
84 memset(&pdu_header, 0, sizeof(pdu_header));
85 memset(&msg, 0, sizeof(msg));
86 memset(&iov, 0, sizeof(iov));
87
88 dbg_vhci_tx("setup txdata urb %p\n", urb);
89
90
91 /* 1. setup usbip_header */
92 setup_cmd_submit_pdu(&pdu_header, urb);
93 usbip_header_correct_endian(&pdu_header, 1);
94
95 iov[0].iov_base = &pdu_header;
96 iov[0].iov_len = sizeof(pdu_header);
97 txsize += sizeof(pdu_header);
98
99 /* 2. setup transfer buffer */
100 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
101 iov[1].iov_base = urb->transfer_buffer;
102 iov[1].iov_len = urb->transfer_buffer_length;
103 txsize += urb->transfer_buffer_length;
104 }
105
106 /* 3. setup iso_packet_descriptor */
107 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
108 ssize_t len = 0;
109
110 iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
111 if (!iso_buffer) {
112 usbip_event_add(&vdev->ud,
113 SDEV_EVENT_ERROR_MALLOC);
114 return -1;
115 }
116
117 iov[2].iov_base = iso_buffer;
118 iov[2].iov_len = len;
119 txsize += len;
120 }
121
122 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
123 if (ret != txsize) {
124 uerr("sendmsg failed!, retval %d for %zd\n", ret,
125 txsize);
126 kfree(iso_buffer);
127 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
128 return -1;
129 }
130
131 kfree(iso_buffer);
132 dbg_vhci_tx("send txdata\n");
133
134 total_size += txsize;
135 }
136
137 return total_size;
138 }
139
140
141 /*-------------------------------------------------------------------------*/
142
143 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
144 {
145 unsigned long flags;
146 struct vhci_unlink *unlink, *tmp;
147
148 spin_lock_irqsave(&vdev->priv_lock, flags);
149
150 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
151 list_move_tail(&unlink->list, &vdev->unlink_rx);
152 spin_unlock_irqrestore(&vdev->priv_lock, flags);
153 return unlink;
154 }
155
156 spin_unlock_irqrestore(&vdev->priv_lock, flags);
157
158 return NULL;
159 }
160
161 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
162 {
163 struct vhci_unlink *unlink = NULL;
164
165 struct msghdr msg;
166 struct kvec iov[3];
167 size_t txsize;
168
169 size_t total_size = 0;
170
171 while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
172 int ret;
173 struct usbip_header pdu_header;
174
175 txsize = 0;
176 memset(&pdu_header, 0, sizeof(pdu_header));
177 memset(&msg, 0, sizeof(msg));
178 memset(&iov, 0, sizeof(iov));
179
180 dbg_vhci_tx("setup cmd unlink, %lu \n", unlink->seqnum);
181
182
183 /* 1. setup usbip_header */
184 pdu_header.base.command = USBIP_CMD_UNLINK;
185 pdu_header.base.seqnum = unlink->seqnum;
186 pdu_header.base.devid = vdev->devid;
187 pdu_header.base.ep = 0;
188 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
189
190 usbip_header_correct_endian(&pdu_header, 1);
191
192 iov[0].iov_base = &pdu_header;
193 iov[0].iov_len = sizeof(pdu_header);
194 txsize += sizeof(pdu_header);
195
196 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
197 if (ret != txsize) {
198 uerr("sendmsg failed!, retval %d for %zd\n", ret,
199 txsize);
200 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
201 return -1;
202 }
203
204
205 dbg_vhci_tx("send txdata\n");
206
207 total_size += txsize;
208 }
209
210 return total_size;
211 }
212
213
214 /*-------------------------------------------------------------------------*/
215
216 void vhci_tx_loop(struct usbip_task *ut)
217 {
218 struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_tx);
219 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
220
221 while (1) {
222 if (signal_pending(current)) {
223 uinfo("vhci_tx signal catched\n");
224 break;
225 }
226
227 if (vhci_send_cmd_submit(vdev) < 0)
228 break;
229
230 if (vhci_send_cmd_unlink(vdev) < 0)
231 break;
232
233 wait_event_interruptible(vdev->waitq_tx,
234 (!list_empty(&vdev->priv_tx) ||
235 !list_empty(&vdev->unlink_tx)));
236
237 dbg_vhci_tx("pending urbs ?, now wake up\n");
238 }
239 }
240
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