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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 | ||
5a0e3ad6 TH |
20 | #include <linux/slab.h> |
21 | ||
04679b34 TH |
22 | #include "usbip_common.h" |
23 | #include "vhci.h" | |
24 | ||
25 | ||
26 | /* get URB from transmitted urb queue */ | |
27 | static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, | |
28 | __u32 seqnum) | |
29 | { | |
30 | struct vhci_priv *priv, *tmp; | |
31 | struct urb *urb = NULL; | |
32 | int status; | |
33 | ||
34 | spin_lock(&vdev->priv_lock); | |
35 | ||
36 | list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { | |
37 | if (priv->seqnum == seqnum) { | |
38 | urb = priv->urb; | |
39 | status = urb->status; | |
40 | ||
b8868e45 | 41 | usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", |
04679b34 TH |
42 | urb, priv, seqnum); |
43 | ||
44 | /* TODO: fix logic here to improve indent situtation */ | |
45 | if (status != -EINPROGRESS) { | |
46 | if (status == -ENOENT || | |
47 | status == -ECONNRESET) | |
48 | dev_info(&urb->dev->dev, | |
49 | "urb %p was unlinked " | |
50 | "%ssynchronuously.\n", urb, | |
51 | status == -ENOENT ? "" : "a"); | |
52 | else | |
53 | dev_info(&urb->dev->dev, | |
54 | "urb %p may be in a error, " | |
55 | "status %d\n", urb, status); | |
56 | } | |
57 | ||
58 | list_del(&priv->list); | |
59 | kfree(priv); | |
60 | urb->hcpriv = NULL; | |
61 | ||
62 | break; | |
63 | } | |
64 | } | |
65 | ||
66 | spin_unlock(&vdev->priv_lock); | |
67 | ||
68 | return urb; | |
69 | } | |
70 | ||
71 | static void vhci_recv_ret_submit(struct vhci_device *vdev, | |
72 | struct usbip_header *pdu) | |
73 | { | |
74 | struct usbip_device *ud = &vdev->ud; | |
75 | struct urb *urb; | |
76 | ||
77 | ||
78 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); | |
79 | ||
80 | ||
81 | if (!urb) { | |
b8868e45 BM |
82 | usbip_uerr("cannot find a urb of seqnum %u\n", |
83 | pdu->base.seqnum); | |
84 | usbip_uinfo("max seqnum %d\n", | |
85 | atomic_read(&the_controller->seqnum)); | |
04679b34 TH |
86 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
87 | return; | |
88 | } | |
89 | ||
90 | ||
91 | /* unpack the pdu to a urb */ | |
92 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
93 | ||
94 | ||
95 | /* recv transfer buffer */ | |
96 | if (usbip_recv_xbuff(ud, urb) < 0) | |
97 | return; | |
98 | ||
99 | ||
100 | /* recv iso_packet_descriptor */ | |
101 | if (usbip_recv_iso(ud, urb) < 0) | |
102 | return; | |
103 | ||
104 | ||
b8868e45 | 105 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
106 | usbip_dump_urb(urb); |
107 | ||
108 | ||
b8868e45 | 109 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 TH |
110 | |
111 | spin_lock(&the_controller->lock); | |
112 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
113 | spin_unlock(&the_controller->lock); | |
114 | ||
115 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); | |
116 | ||
117 | ||
b8868e45 | 118 | usbip_dbg_vhci_rx("Leave\n"); |
04679b34 TH |
119 | |
120 | return; | |
121 | } | |
122 | ||
123 | ||
124 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, | |
125 | struct usbip_header *pdu) | |
126 | { | |
127 | struct vhci_unlink *unlink, *tmp; | |
128 | ||
129 | spin_lock(&vdev->priv_lock); | |
130 | ||
131 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
b8868e45 | 132 | usbip_uinfo("unlink->seqnum %lu\n", unlink->seqnum); |
04679b34 | 133 | if (unlink->seqnum == pdu->base.seqnum) { |
b8868e45 | 134 | usbip_dbg_vhci_rx("found pending unlink, %lu\n", |
04679b34 TH |
135 | unlink->seqnum); |
136 | list_del(&unlink->list); | |
137 | ||
138 | spin_unlock(&vdev->priv_lock); | |
139 | return unlink; | |
140 | } | |
141 | } | |
142 | ||
143 | spin_unlock(&vdev->priv_lock); | |
144 | ||
145 | return NULL; | |
146 | } | |
147 | ||
148 | ||
149 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, | |
150 | struct usbip_header *pdu) | |
151 | { | |
152 | struct vhci_unlink *unlink; | |
153 | struct urb *urb; | |
154 | ||
155 | usbip_dump_header(pdu); | |
156 | ||
157 | unlink = dequeue_pending_unlink(vdev, pdu); | |
158 | if (!unlink) { | |
b8868e45 BM |
159 | usbip_uinfo("cannot find the pending unlink %u\n", |
160 | pdu->base.seqnum); | |
04679b34 TH |
161 | return; |
162 | } | |
163 | ||
164 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); | |
165 | if (!urb) { | |
166 | /* | |
167 | * I get the result of a unlink request. But, it seems that I | |
168 | * already received the result of its submit result and gave | |
169 | * back the URB. | |
170 | */ | |
b8868e45 | 171 | usbip_uinfo("the urb (seqnum %d) was already given backed\n", |
04679b34 TH |
172 | pdu->base.seqnum); |
173 | } else { | |
b8868e45 | 174 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 TH |
175 | |
176 | /* If unlink is succeed, status is -ECONNRESET */ | |
177 | urb->status = pdu->u.ret_unlink.status; | |
b8868e45 | 178 | usbip_uinfo("%d\n", urb->status); |
04679b34 TH |
179 | |
180 | spin_lock(&the_controller->lock); | |
181 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
182 | spin_unlock(&the_controller->lock); | |
183 | ||
184 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, | |
185 | urb->status); | |
186 | } | |
187 | ||
188 | kfree(unlink); | |
189 | ||
190 | return; | |
191 | } | |
192 | ||
193 | /* recv a pdu */ | |
194 | static void vhci_rx_pdu(struct usbip_device *ud) | |
195 | { | |
196 | int ret; | |
197 | struct usbip_header pdu; | |
198 | struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); | |
199 | ||
200 | ||
b8868e45 | 201 | usbip_dbg_vhci_rx("Enter\n"); |
04679b34 TH |
202 | |
203 | memset(&pdu, 0, sizeof(pdu)); | |
204 | ||
205 | ||
206 | /* 1. receive a pdu header */ | |
207 | ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0); | |
208 | if (ret != sizeof(pdu)) { | |
b8868e45 BM |
209 | usbip_uerr("receiving pdu failed! size is %d, should be %d\n", |
210 | ret, (unsigned int)sizeof(pdu)); | |
04679b34 TH |
211 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
212 | return; | |
213 | } | |
214 | ||
215 | usbip_header_correct_endian(&pdu, 0); | |
216 | ||
b8868e45 | 217 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
218 | usbip_dump_header(&pdu); |
219 | ||
220 | switch (pdu.base.command) { | |
221 | case USBIP_RET_SUBMIT: | |
222 | vhci_recv_ret_submit(vdev, &pdu); | |
223 | break; | |
224 | case USBIP_RET_UNLINK: | |
225 | vhci_recv_ret_unlink(vdev, &pdu); | |
226 | break; | |
227 | default: | |
228 | /* NOTREACHED */ | |
b8868e45 | 229 | usbip_uerr("unknown pdu %u\n", pdu.base.command); |
04679b34 TH |
230 | usbip_dump_header(&pdu); |
231 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
232 | } | |
233 | } | |
234 | ||
235 | ||
236 | /*-------------------------------------------------------------------------*/ | |
237 | ||
238 | void vhci_rx_loop(struct usbip_task *ut) | |
239 | { | |
240 | struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx); | |
241 | ||
242 | ||
243 | while (1) { | |
244 | if (signal_pending(current)) { | |
b8868e45 | 245 | usbip_dbg_vhci_rx("signal catched!\n"); |
04679b34 TH |
246 | break; |
247 | } | |
248 | ||
249 | ||
b8868e45 | 250 | if (usbip_event_happened(ud)) |
04679b34 TH |
251 | break; |
252 | ||
253 | vhci_rx_pdu(ud); | |
254 | } | |
255 | } | |
256 |