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04679b34 TH |
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 | /* get URB from transmitted urb queue */ | |
25 | static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, | |
26 | __u32 seqnum) | |
27 | { | |
28 | struct vhci_priv *priv, *tmp; | |
29 | struct urb *urb = NULL; | |
30 | int status; | |
31 | ||
32 | spin_lock(&vdev->priv_lock); | |
33 | ||
34 | list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { | |
35 | if (priv->seqnum == seqnum) { | |
36 | urb = priv->urb; | |
37 | status = urb->status; | |
38 | ||
39 | dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", | |
40 | urb, priv, seqnum); | |
41 | ||
42 | /* TODO: fix logic here to improve indent situtation */ | |
43 | if (status != -EINPROGRESS) { | |
44 | if (status == -ENOENT || | |
45 | status == -ECONNRESET) | |
46 | dev_info(&urb->dev->dev, | |
47 | "urb %p was unlinked " | |
48 | "%ssynchronuously.\n", urb, | |
49 | status == -ENOENT ? "" : "a"); | |
50 | else | |
51 | dev_info(&urb->dev->dev, | |
52 | "urb %p may be in a error, " | |
53 | "status %d\n", urb, status); | |
54 | } | |
55 | ||
56 | list_del(&priv->list); | |
57 | kfree(priv); | |
58 | urb->hcpriv = NULL; | |
59 | ||
60 | break; | |
61 | } | |
62 | } | |
63 | ||
64 | spin_unlock(&vdev->priv_lock); | |
65 | ||
66 | return urb; | |
67 | } | |
68 | ||
69 | static void vhci_recv_ret_submit(struct vhci_device *vdev, | |
70 | struct usbip_header *pdu) | |
71 | { | |
72 | struct usbip_device *ud = &vdev->ud; | |
73 | struct urb *urb; | |
74 | ||
75 | ||
76 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); | |
77 | ||
78 | ||
79 | if (!urb) { | |
80 | uerr("cannot find a urb of seqnum %u\n", pdu->base.seqnum); | |
81 | uinfo("max seqnum %d\n", atomic_read(&the_controller->seqnum)); | |
82 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
83 | return; | |
84 | } | |
85 | ||
86 | ||
87 | /* unpack the pdu to a urb */ | |
88 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
89 | ||
90 | ||
91 | /* recv transfer buffer */ | |
92 | if (usbip_recv_xbuff(ud, urb) < 0) | |
93 | return; | |
94 | ||
95 | ||
96 | /* recv iso_packet_descriptor */ | |
97 | if (usbip_recv_iso(ud, urb) < 0) | |
98 | return; | |
99 | ||
100 | ||
101 | if (dbg_flag_vhci_rx) | |
102 | usbip_dump_urb(urb); | |
103 | ||
104 | ||
105 | dbg_vhci_rx("now giveback urb %p\n", urb); | |
106 | ||
107 | spin_lock(&the_controller->lock); | |
108 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
109 | spin_unlock(&the_controller->lock); | |
110 | ||
111 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); | |
112 | ||
113 | ||
114 | dbg_vhci_rx("Leave\n"); | |
115 | ||
116 | return; | |
117 | } | |
118 | ||
119 | ||
120 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, | |
121 | struct usbip_header *pdu) | |
122 | { | |
123 | struct vhci_unlink *unlink, *tmp; | |
124 | ||
125 | spin_lock(&vdev->priv_lock); | |
126 | ||
127 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
128 | uinfo("unlink->seqnum %lu\n", unlink->seqnum); | |
129 | if (unlink->seqnum == pdu->base.seqnum) { | |
130 | dbg_vhci_rx("found pending unlink, %lu\n", | |
131 | unlink->seqnum); | |
132 | list_del(&unlink->list); | |
133 | ||
134 | spin_unlock(&vdev->priv_lock); | |
135 | return unlink; | |
136 | } | |
137 | } | |
138 | ||
139 | spin_unlock(&vdev->priv_lock); | |
140 | ||
141 | return NULL; | |
142 | } | |
143 | ||
144 | ||
145 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, | |
146 | struct usbip_header *pdu) | |
147 | { | |
148 | struct vhci_unlink *unlink; | |
149 | struct urb *urb; | |
150 | ||
151 | usbip_dump_header(pdu); | |
152 | ||
153 | unlink = dequeue_pending_unlink(vdev, pdu); | |
154 | if (!unlink) { | |
155 | uinfo("cannot find the pending unlink %u\n", pdu->base.seqnum); | |
156 | return; | |
157 | } | |
158 | ||
159 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); | |
160 | if (!urb) { | |
161 | /* | |
162 | * I get the result of a unlink request. But, it seems that I | |
163 | * already received the result of its submit result and gave | |
164 | * back the URB. | |
165 | */ | |
166 | uinfo("the urb (seqnum %d) was already given backed\n", | |
167 | pdu->base.seqnum); | |
168 | } else { | |
169 | dbg_vhci_rx("now giveback urb %p\n", urb); | |
170 | ||
171 | /* If unlink is succeed, status is -ECONNRESET */ | |
172 | urb->status = pdu->u.ret_unlink.status; | |
173 | uinfo("%d\n", urb->status); | |
174 | ||
175 | spin_lock(&the_controller->lock); | |
176 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
177 | spin_unlock(&the_controller->lock); | |
178 | ||
179 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, | |
180 | urb->status); | |
181 | } | |
182 | ||
183 | kfree(unlink); | |
184 | ||
185 | return; | |
186 | } | |
187 | ||
188 | /* recv a pdu */ | |
189 | static void vhci_rx_pdu(struct usbip_device *ud) | |
190 | { | |
191 | int ret; | |
192 | struct usbip_header pdu; | |
193 | struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); | |
194 | ||
195 | ||
196 | dbg_vhci_rx("Enter\n"); | |
197 | ||
198 | memset(&pdu, 0, sizeof(pdu)); | |
199 | ||
200 | ||
201 | /* 1. receive a pdu header */ | |
202 | ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0); | |
203 | if (ret != sizeof(pdu)) { | |
204 | uerr("receiving pdu failed! size is %d, should be %d\n", | |
205 | ret, sizeof(pdu)); | |
206 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
207 | return; | |
208 | } | |
209 | ||
210 | usbip_header_correct_endian(&pdu, 0); | |
211 | ||
212 | if (dbg_flag_vhci_rx) | |
213 | usbip_dump_header(&pdu); | |
214 | ||
215 | switch (pdu.base.command) { | |
216 | case USBIP_RET_SUBMIT: | |
217 | vhci_recv_ret_submit(vdev, &pdu); | |
218 | break; | |
219 | case USBIP_RET_UNLINK: | |
220 | vhci_recv_ret_unlink(vdev, &pdu); | |
221 | break; | |
222 | default: | |
223 | /* NOTREACHED */ | |
224 | uerr("unknown pdu %u\n", pdu.base.command); | |
225 | usbip_dump_header(&pdu); | |
226 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
227 | } | |
228 | } | |
229 | ||
230 | ||
231 | /*-------------------------------------------------------------------------*/ | |
232 | ||
233 | void vhci_rx_loop(struct usbip_task *ut) | |
234 | { | |
235 | struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx); | |
236 | ||
237 | ||
238 | while (1) { | |
239 | if (signal_pending(current)) { | |
240 | dbg_vhci_rx("signal catched!\n"); | |
241 | break; | |
242 | } | |
243 | ||
244 | ||
245 | if (usbip_event_happend(ud)) | |
246 | break; | |
247 | ||
248 | vhci_rx_pdu(ud); | |
249 | } | |
250 | } | |
251 |