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4d7b5c7f 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 | ||
4d7b5c7f TH |
22 | #include "usbip_common.h" |
23 | #include "stub.h" | |
24 | ||
25 | ||
26 | static void stub_free_priv_and_urb(struct stub_priv *priv) | |
27 | { | |
28 | struct urb *urb = priv->urb; | |
29 | ||
30 | kfree(urb->setup_packet); | |
31 | kfree(urb->transfer_buffer); | |
32 | list_del(&priv->list); | |
33 | kmem_cache_free(stub_priv_cache, priv); | |
34 | usb_free_urb(urb); | |
35 | } | |
36 | ||
37 | /* be in spin_lock_irqsave(&sdev->priv_lock, flags) */ | |
38 | void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum, | |
39 | __u32 status) | |
40 | { | |
41 | struct stub_unlink *unlink; | |
42 | ||
43 | unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC); | |
44 | if (!unlink) { | |
45 | dev_err(&sdev->interface->dev, "alloc stub_unlink\n"); | |
46 | usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC); | |
47 | return; | |
48 | } | |
49 | ||
50 | unlink->seqnum = seqnum; | |
51 | unlink->status = status; | |
52 | ||
53 | list_add_tail(&unlink->list, &sdev->unlink_tx); | |
54 | } | |
55 | ||
56 | /** | |
57 | * stub_complete - completion handler of a usbip urb | |
58 | * @urb: pointer to the urb completed | |
4d7b5c7f TH |
59 | * |
60 | * When a urb has completed, the USB core driver calls this function mostly in | |
61 | * the interrupt context. To return the result of a urb, the completed urb is | |
62 | * linked to the pending list of returning. | |
63 | * | |
64 | */ | |
65 | void stub_complete(struct urb *urb) | |
66 | { | |
67 | struct stub_priv *priv = (struct stub_priv *) urb->context; | |
68 | struct stub_device *sdev = priv->sdev; | |
69 | unsigned long flags; | |
70 | ||
b8868e45 | 71 | usbip_dbg_stub_tx("complete! status %d\n", urb->status); |
4d7b5c7f TH |
72 | |
73 | ||
74 | switch (urb->status) { | |
75 | case 0: | |
76 | /* OK */ | |
77 | break; | |
78 | case -ENOENT: | |
b8868e45 | 79 | usbip_uinfo("stopped by a call of usb_kill_urb() because of" |
4d7b5c7f TH |
80 | "cleaning up a virtual connection\n"); |
81 | return; | |
82 | case -ECONNRESET: | |
b8868e45 | 83 | usbip_uinfo("unlinked by a call of usb_unlink_urb()\n"); |
4d7b5c7f TH |
84 | break; |
85 | case -EPIPE: | |
b8868e45 BM |
86 | usbip_uinfo("endpoint %d is stalled\n", |
87 | usb_pipeendpoint(urb->pipe)); | |
4d7b5c7f TH |
88 | break; |
89 | case -ESHUTDOWN: | |
b8868e45 | 90 | usbip_uinfo("device removed?\n"); |
4d7b5c7f TH |
91 | break; |
92 | default: | |
b8868e45 BM |
93 | usbip_uinfo("urb completion with non-zero status %d\n", |
94 | urb->status); | |
4d7b5c7f TH |
95 | } |
96 | ||
97 | /* link a urb to the queue of tx. */ | |
98 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
99 | ||
100 | if (priv->unlinking) { | |
101 | stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status); | |
102 | stub_free_priv_and_urb(priv); | |
103 | } else | |
104 | list_move_tail(&priv->list, &sdev->priv_tx); | |
105 | ||
106 | ||
107 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
108 | ||
109 | /* wake up tx_thread */ | |
110 | wake_up(&sdev->tx_waitq); | |
111 | } | |
112 | ||
113 | ||
114 | /*-------------------------------------------------------------------------*/ | |
115 | /* fill PDU */ | |
116 | ||
117 | static inline void setup_base_pdu(struct usbip_header_basic *base, | |
118 | __u32 command, __u32 seqnum) | |
119 | { | |
120 | base->command = command; | |
121 | base->seqnum = seqnum; | |
122 | base->devid = 0; | |
123 | base->ep = 0; | |
124 | base->direction = 0; | |
125 | } | |
126 | ||
127 | static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb) | |
128 | { | |
129 | struct stub_priv *priv = (struct stub_priv *) urb->context; | |
130 | ||
131 | setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum); | |
132 | ||
133 | usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1); | |
134 | } | |
135 | ||
136 | static void setup_ret_unlink_pdu(struct usbip_header *rpdu, | |
137 | struct stub_unlink *unlink) | |
138 | { | |
139 | setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum); | |
140 | ||
141 | rpdu->u.ret_unlink.status = unlink->status; | |
142 | } | |
143 | ||
144 | ||
145 | /*-------------------------------------------------------------------------*/ | |
146 | /* send RET_SUBMIT */ | |
147 | ||
148 | static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev) | |
149 | { | |
150 | unsigned long flags; | |
151 | struct stub_priv *priv, *tmp; | |
152 | ||
153 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
154 | ||
155 | list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) { | |
156 | list_move_tail(&priv->list, &sdev->priv_free); | |
157 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
158 | return priv; | |
159 | } | |
160 | ||
161 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
166 | static int stub_send_ret_submit(struct stub_device *sdev) | |
167 | { | |
168 | unsigned long flags; | |
169 | struct stub_priv *priv, *tmp; | |
170 | ||
171 | struct msghdr msg; | |
172 | struct kvec iov[3]; | |
173 | size_t txsize; | |
174 | ||
175 | size_t total_size = 0; | |
176 | ||
177 | while ((priv = dequeue_from_priv_tx(sdev)) != NULL) { | |
178 | int ret; | |
179 | struct urb *urb = priv->urb; | |
180 | struct usbip_header pdu_header; | |
181 | void *iso_buffer = NULL; | |
182 | ||
183 | txsize = 0; | |
184 | memset(&pdu_header, 0, sizeof(pdu_header)); | |
185 | memset(&msg, 0, sizeof(msg)); | |
186 | memset(&iov, 0, sizeof(iov)); | |
187 | ||
b8868e45 | 188 | usbip_dbg_stub_tx("setup txdata urb %p\n", urb); |
4d7b5c7f TH |
189 | |
190 | ||
191 | /* 1. setup usbip_header */ | |
192 | setup_ret_submit_pdu(&pdu_header, urb); | |
193 | usbip_header_correct_endian(&pdu_header, 1); | |
194 | ||
195 | iov[0].iov_base = &pdu_header; | |
196 | iov[0].iov_len = sizeof(pdu_header); | |
197 | txsize += sizeof(pdu_header); | |
198 | ||
199 | /* 2. setup transfer buffer */ | |
200 | if (usb_pipein(urb->pipe) && urb->actual_length > 0) { | |
201 | iov[1].iov_base = urb->transfer_buffer; | |
202 | iov[1].iov_len = urb->actual_length; | |
203 | txsize += urb->actual_length; | |
204 | } | |
205 | ||
206 | /* 3. setup iso_packet_descriptor */ | |
207 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { | |
208 | ssize_t len = 0; | |
209 | ||
210 | iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); | |
211 | if (!iso_buffer) { | |
212 | usbip_event_add(&sdev->ud, | |
213 | SDEV_EVENT_ERROR_MALLOC); | |
214 | return -1; | |
215 | } | |
216 | ||
217 | iov[2].iov_base = iso_buffer; | |
218 | iov[2].iov_len = len; | |
219 | txsize += len; | |
220 | } | |
221 | ||
222 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov, | |
223 | 3, txsize); | |
224 | if (ret != txsize) { | |
225 | dev_err(&sdev->interface->dev, | |
226 | "sendmsg failed!, retval %d for %zd\n", | |
227 | ret, txsize); | |
228 | kfree(iso_buffer); | |
229 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); | |
230 | return -1; | |
231 | } | |
232 | ||
233 | kfree(iso_buffer); | |
b8868e45 | 234 | usbip_dbg_stub_tx("send txdata\n"); |
4d7b5c7f TH |
235 | |
236 | total_size += txsize; | |
237 | } | |
238 | ||
239 | ||
240 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
241 | ||
242 | list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) { | |
243 | stub_free_priv_and_urb(priv); | |
244 | } | |
245 | ||
246 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
247 | ||
248 | return total_size; | |
249 | } | |
250 | ||
251 | ||
252 | /*-------------------------------------------------------------------------*/ | |
253 | /* send RET_UNLINK */ | |
254 | ||
255 | static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev) | |
256 | { | |
257 | unsigned long flags; | |
258 | struct stub_unlink *unlink, *tmp; | |
259 | ||
260 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
261 | ||
262 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) { | |
263 | list_move_tail(&unlink->list, &sdev->unlink_free); | |
264 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
265 | return unlink; | |
266 | } | |
267 | ||
268 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
269 | ||
270 | return NULL; | |
271 | } | |
272 | ||
273 | ||
274 | static int stub_send_ret_unlink(struct stub_device *sdev) | |
275 | { | |
276 | unsigned long flags; | |
277 | struct stub_unlink *unlink, *tmp; | |
278 | ||
279 | struct msghdr msg; | |
280 | struct kvec iov[1]; | |
281 | size_t txsize; | |
282 | ||
283 | size_t total_size = 0; | |
284 | ||
285 | while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) { | |
286 | int ret; | |
287 | struct usbip_header pdu_header; | |
288 | ||
289 | txsize = 0; | |
290 | memset(&pdu_header, 0, sizeof(pdu_header)); | |
291 | memset(&msg, 0, sizeof(msg)); | |
292 | memset(&iov, 0, sizeof(iov)); | |
293 | ||
b8868e45 | 294 | usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum); |
4d7b5c7f TH |
295 | |
296 | /* 1. setup usbip_header */ | |
297 | setup_ret_unlink_pdu(&pdu_header, unlink); | |
298 | usbip_header_correct_endian(&pdu_header, 1); | |
299 | ||
300 | iov[0].iov_base = &pdu_header; | |
301 | iov[0].iov_len = sizeof(pdu_header); | |
302 | txsize += sizeof(pdu_header); | |
303 | ||
304 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov, | |
305 | 1, txsize); | |
306 | if (ret != txsize) { | |
307 | dev_err(&sdev->interface->dev, | |
308 | "sendmsg failed!, retval %d for %zd\n", | |
309 | ret, txsize); | |
310 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); | |
311 | return -1; | |
312 | } | |
313 | ||
314 | ||
b8868e45 | 315 | usbip_dbg_stub_tx("send txdata\n"); |
4d7b5c7f TH |
316 | |
317 | total_size += txsize; | |
318 | } | |
319 | ||
320 | ||
321 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
322 | ||
323 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) { | |
324 | list_del(&unlink->list); | |
325 | kfree(unlink); | |
326 | } | |
327 | ||
328 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
329 | ||
330 | return total_size; | |
331 | } | |
332 | ||
333 | ||
334 | /*-------------------------------------------------------------------------*/ | |
335 | ||
336 | void stub_tx_loop(struct usbip_task *ut) | |
337 | { | |
338 | struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_tx); | |
339 | struct stub_device *sdev = container_of(ud, struct stub_device, ud); | |
340 | ||
341 | while (1) { | |
342 | if (signal_pending(current)) { | |
b8868e45 | 343 | usbip_dbg_stub_tx("signal catched\n"); |
4d7b5c7f TH |
344 | break; |
345 | } | |
346 | ||
b8868e45 | 347 | if (usbip_event_happened(ud)) |
4d7b5c7f TH |
348 | break; |
349 | ||
350 | /* | |
351 | * send_ret_submit comes earlier than send_ret_unlink. stub_rx | |
352 | * looks at only priv_init queue. If the completion of a URB is | |
353 | * earlier than the receive of CMD_UNLINK, priv is moved to | |
354 | * priv_tx queue and stub_rx does not find the target priv. In | |
355 | * this case, vhci_rx receives the result of the submit request | |
356 | * and then receives the result of the unlink request. The | |
357 | * result of the submit is given back to the usbcore as the | |
358 | * completion of the unlink request. The request of the | |
359 | * unlink is ignored. This is ok because a driver who calls | |
360 | * usb_unlink_urb() understands the unlink was too late by | |
361 | * getting the status of the given-backed URB which has the | |
362 | * status of usb_submit_urb(). | |
363 | */ | |
364 | if (stub_send_ret_submit(sdev) < 0) | |
365 | break; | |
366 | ||
367 | if (stub_send_ret_unlink(sdev) < 0) | |
368 | break; | |
369 | ||
370 | wait_event_interruptible(sdev->tx_waitq, | |
371 | (!list_empty(&sdev->priv_tx) || | |
372 | !list_empty(&sdev->unlink_tx))); | |
373 | } | |
374 | } |