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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 | ||
9720b4bc | 20 | #include <linux/kthread.h> |
7aaacb43 | 21 | #include <linux/slab.h> |
5a0e3ad6 | 22 | |
04679b34 TH |
23 | #include "usbip_common.h" |
24 | #include "vhci.h" | |
25 | ||
b92a5e23 | 26 | /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */ |
5ef6aceb | 27 | struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum) |
04679b34 TH |
28 | { |
29 | struct vhci_priv *priv, *tmp; | |
30 | struct urb *urb = NULL; | |
31 | int status; | |
32 | ||
04679b34 TH |
33 | list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { |
34 | if (priv->seqnum == seqnum) { | |
35 | urb = priv->urb; | |
36 | status = urb->status; | |
37 | ||
b8868e45 | 38 | usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", |
5ef6aceb | 39 | urb, priv, seqnum); |
04679b34 TH |
40 | |
41 | /* TODO: fix logic here to improve indent situtation */ | |
42 | if (status != -EINPROGRESS) { | |
43 | if (status == -ENOENT || | |
5ef6aceb | 44 | status == -ECONNRESET) |
04679b34 TH |
45 | dev_info(&urb->dev->dev, |
46 | "urb %p was unlinked " | |
47 | "%ssynchronuously.\n", urb, | |
48 | status == -ENOENT ? "" : "a"); | |
49 | else | |
50 | dev_info(&urb->dev->dev, | |
51 | "urb %p may be in a error, " | |
52 | "status %d\n", urb, status); | |
53 | } | |
54 | ||
55 | list_del(&priv->list); | |
56 | kfree(priv); | |
57 | urb->hcpriv = NULL; | |
58 | ||
59 | break; | |
60 | } | |
61 | } | |
62 | ||
04679b34 TH |
63 | return urb; |
64 | } | |
65 | ||
66 | static void vhci_recv_ret_submit(struct vhci_device *vdev, | |
5ef6aceb | 67 | struct usbip_header *pdu) |
04679b34 TH |
68 | { |
69 | struct usbip_device *ud = &vdev->ud; | |
70 | struct urb *urb; | |
71 | ||
b92a5e23 | 72 | spin_lock(&vdev->priv_lock); |
04679b34 | 73 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); |
b92a5e23 | 74 | spin_unlock(&vdev->priv_lock); |
04679b34 TH |
75 | |
76 | if (!urb) { | |
1a4b6f66 | 77 | pr_err("cannot find a urb of seqnum %u\n", pdu->base.seqnum); |
78 | pr_info("max seqnum %d\n", | |
79 | atomic_read(&the_controller->seqnum)); | |
04679b34 TH |
80 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
81 | return; | |
82 | } | |
83 | ||
04679b34 TH |
84 | /* unpack the pdu to a urb */ |
85 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
86 | ||
04679b34 TH |
87 | /* recv transfer buffer */ |
88 | if (usbip_recv_xbuff(ud, urb) < 0) | |
89 | return; | |
90 | ||
04679b34 TH |
91 | /* recv iso_packet_descriptor */ |
92 | if (usbip_recv_iso(ud, urb) < 0) | |
93 | return; | |
94 | ||
28276a28 AM |
95 | /* restore the padding in iso packets */ |
96 | if (usbip_pad_iso(ud, urb) < 0) | |
97 | return; | |
04679b34 | 98 | |
b8868e45 | 99 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
100 | usbip_dump_urb(urb); |
101 | ||
b8868e45 | 102 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 TH |
103 | |
104 | spin_lock(&the_controller->lock); | |
105 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
106 | spin_unlock(&the_controller->lock); | |
107 | ||
108 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); | |
109 | ||
b8868e45 | 110 | usbip_dbg_vhci_rx("Leave\n"); |
04679b34 TH |
111 | |
112 | return; | |
113 | } | |
114 | ||
04679b34 | 115 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, |
5ef6aceb | 116 | struct usbip_header *pdu) |
04679b34 TH |
117 | { |
118 | struct vhci_unlink *unlink, *tmp; | |
119 | ||
120 | spin_lock(&vdev->priv_lock); | |
121 | ||
122 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
1a4b6f66 | 123 | pr_info("unlink->seqnum %lu\n", unlink->seqnum); |
04679b34 | 124 | if (unlink->seqnum == pdu->base.seqnum) { |
b8868e45 | 125 | usbip_dbg_vhci_rx("found pending unlink, %lu\n", |
5ef6aceb | 126 | unlink->seqnum); |
04679b34 TH |
127 | list_del(&unlink->list); |
128 | ||
129 | spin_unlock(&vdev->priv_lock); | |
130 | return unlink; | |
131 | } | |
132 | } | |
133 | ||
134 | spin_unlock(&vdev->priv_lock); | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
04679b34 | 139 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, |
5ef6aceb | 140 | struct usbip_header *pdu) |
04679b34 TH |
141 | { |
142 | struct vhci_unlink *unlink; | |
143 | struct urb *urb; | |
144 | ||
145 | usbip_dump_header(pdu); | |
146 | ||
147 | unlink = dequeue_pending_unlink(vdev, pdu); | |
148 | if (!unlink) { | |
1a4b6f66 | 149 | pr_info("cannot find the pending unlink %u\n", |
150 | pdu->base.seqnum); | |
04679b34 TH |
151 | return; |
152 | } | |
153 | ||
b92a5e23 | 154 | spin_lock(&vdev->priv_lock); |
04679b34 | 155 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); |
b92a5e23 MV |
156 | spin_unlock(&vdev->priv_lock); |
157 | ||
04679b34 TH |
158 | if (!urb) { |
159 | /* | |
160 | * I get the result of a unlink request. But, it seems that I | |
161 | * already received the result of its submit result and gave | |
162 | * back the URB. | |
163 | */ | |
1a4b6f66 | 164 | pr_info("the urb (seqnum %d) was already given backed\n", |
165 | pdu->base.seqnum); | |
04679b34 | 166 | } else { |
b8868e45 | 167 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 TH |
168 | |
169 | /* If unlink is succeed, status is -ECONNRESET */ | |
170 | urb->status = pdu->u.ret_unlink.status; | |
1a4b6f66 | 171 | pr_info("urb->status %d\n", urb->status); |
04679b34 TH |
172 | |
173 | spin_lock(&the_controller->lock); | |
174 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); | |
175 | spin_unlock(&the_controller->lock); | |
176 | ||
177 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, | |
5ef6aceb | 178 | urb->status); |
04679b34 TH |
179 | } |
180 | ||
181 | kfree(unlink); | |
04679b34 TH |
182 | } |
183 | ||
bd65f623 MV |
184 | static int vhci_priv_tx_empty(struct vhci_device *vdev) |
185 | { | |
186 | int empty = 0; | |
187 | ||
188 | spin_lock(&vdev->priv_lock); | |
bd65f623 | 189 | empty = list_empty(&vdev->priv_rx); |
bd65f623 MV |
190 | spin_unlock(&vdev->priv_lock); |
191 | ||
192 | return empty; | |
193 | } | |
194 | ||
04679b34 TH |
195 | /* recv a pdu */ |
196 | static void vhci_rx_pdu(struct usbip_device *ud) | |
197 | { | |
198 | int ret; | |
199 | struct usbip_header pdu; | |
200 | struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); | |
201 | ||
b8868e45 | 202 | usbip_dbg_vhci_rx("Enter\n"); |
04679b34 TH |
203 | |
204 | memset(&pdu, 0, sizeof(pdu)); | |
205 | ||
04679b34 TH |
206 | /* 1. receive a pdu header */ |
207 | ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0); | |
7e249c8b MV |
208 | if (ret < 0) { |
209 | if (ret == -ECONNRESET) | |
1a4b6f66 | 210 | pr_info("connection reset by peer\n"); |
bd65f623 MV |
211 | else if (ret == -EAGAIN) { |
212 | /* ignore if connection was idle */ | |
213 | if (vhci_priv_tx_empty(vdev)) | |
214 | return; | |
1a4b6f66 | 215 | pr_info("connection timed out with pending urbs\n"); |
bd65f623 | 216 | } else if (ret != -ERESTARTSYS) |
1a4b6f66 | 217 | pr_info("xmit failed %d\n", ret); |
bd65f623 | 218 | |
7e249c8b MV |
219 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
220 | return; | |
221 | } | |
222 | if (ret == 0) { | |
1a4b6f66 | 223 | pr_info("connection closed"); |
7e249c8b MV |
224 | usbip_event_add(ud, VDEV_EVENT_DOWN); |
225 | return; | |
226 | } | |
04679b34 | 227 | if (ret != sizeof(pdu)) { |
1a4b6f66 | 228 | pr_err("received pdu size is %d, should be %d\n", ret, |
229 | (unsigned int)sizeof(pdu)); | |
04679b34 TH |
230 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
231 | return; | |
232 | } | |
233 | ||
234 | usbip_header_correct_endian(&pdu, 0); | |
235 | ||
b8868e45 | 236 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
237 | usbip_dump_header(&pdu); |
238 | ||
239 | switch (pdu.base.command) { | |
240 | case USBIP_RET_SUBMIT: | |
241 | vhci_recv_ret_submit(vdev, &pdu); | |
242 | break; | |
243 | case USBIP_RET_UNLINK: | |
244 | vhci_recv_ret_unlink(vdev, &pdu); | |
245 | break; | |
246 | default: | |
49aecefc | 247 | /* NOT REACHED */ |
1a4b6f66 | 248 | pr_err("unknown pdu %u\n", pdu.base.command); |
04679b34 TH |
249 | usbip_dump_header(&pdu); |
250 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
49aecefc | 251 | break; |
04679b34 TH |
252 | } |
253 | } | |
254 | ||
9720b4bc | 255 | int vhci_rx_loop(void *data) |
04679b34 | 256 | { |
9720b4bc | 257 | struct usbip_device *ud = data; |
04679b34 | 258 | |
9720b4bc | 259 | while (!kthread_should_stop()) { |
b8868e45 | 260 | if (usbip_event_happened(ud)) |
04679b34 TH |
261 | break; |
262 | ||
263 | vhci_rx_pdu(ud); | |
264 | } | |
04679b34 | 265 | |
9720b4bc AB |
266 | return 0; |
267 | } |