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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 | ||
9720b4bc | 20 | #include <linux/kthread.h> |
7aaacb43 | 21 | #include <linux/socket.h> |
5a0e3ad6 | 22 | |
4d7b5c7f TH |
23 | #include "usbip_common.h" |
24 | #include "stub.h" | |
25 | ||
4d7b5c7f TH |
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) { | |
4d7b5c7f TH |
45 | usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC); |
46 | return; | |
47 | } | |
48 | ||
49 | unlink->seqnum = seqnum; | |
50 | unlink->status = status; | |
51 | ||
52 | list_add_tail(&unlink->list, &sdev->unlink_tx); | |
53 | } | |
54 | ||
55 | /** | |
56 | * stub_complete - completion handler of a usbip urb | |
57 | * @urb: pointer to the urb completed | |
4d7b5c7f TH |
58 | * |
59 | * When a urb has completed, the USB core driver calls this function mostly in | |
60 | * the interrupt context. To return the result of a urb, the completed urb is | |
61 | * linked to the pending list of returning. | |
62 | * | |
63 | */ | |
64 | void stub_complete(struct urb *urb) | |
65 | { | |
66 | struct stub_priv *priv = (struct stub_priv *) urb->context; | |
67 | struct stub_device *sdev = priv->sdev; | |
68 | unsigned long flags; | |
69 | ||
b8868e45 | 70 | usbip_dbg_stub_tx("complete! status %d\n", urb->status); |
4d7b5c7f | 71 | |
4d7b5c7f TH |
72 | switch (urb->status) { |
73 | case 0: | |
74 | /* OK */ | |
75 | break; | |
76 | case -ENOENT: | |
6bb3ee69 CC |
77 | dev_info(&urb->dev->dev, |
78 | "stopped by a call to usb_kill_urb() because of cleaning up a virtual connection\n"); | |
4d7b5c7f TH |
79 | return; |
80 | case -ECONNRESET: | |
6bb3ee69 CC |
81 | dev_info(&urb->dev->dev, |
82 | "unlinked by a call to usb_unlink_urb()\n"); | |
4d7b5c7f TH |
83 | break; |
84 | case -EPIPE: | |
1a4b6f66 | 85 | dev_info(&urb->dev->dev, "endpoint %d is stalled\n", |
86 | usb_pipeendpoint(urb->pipe)); | |
4d7b5c7f TH |
87 | break; |
88 | case -ESHUTDOWN: | |
1a4b6f66 | 89 | dev_info(&urb->dev->dev, "device removed?\n"); |
4d7b5c7f TH |
90 | break; |
91 | default: | |
6bb3ee69 CC |
92 | dev_info(&urb->dev->dev, |
93 | "urb completion with non-zero status %d\n", | |
94 | urb->status); | |
49aecefc | 95 | break; |
4d7b5c7f TH |
96 | } |
97 | ||
98 | /* link a urb to the queue of tx. */ | |
99 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
4d7b5c7f TH |
100 | if (priv->unlinking) { |
101 | stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status); | |
102 | stub_free_priv_and_urb(priv); | |
87352760 | 103 | } else { |
4d7b5c7f | 104 | list_move_tail(&priv->list, &sdev->priv_tx); |
87352760 | 105 | } |
4d7b5c7f TH |
106 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
107 | ||
108 | /* wake up tx_thread */ | |
109 | wake_up(&sdev->tx_waitq); | |
110 | } | |
111 | ||
4d7b5c7f | 112 | static inline void setup_base_pdu(struct usbip_header_basic *base, |
c6956c97 | 113 | __u32 command, __u32 seqnum) |
4d7b5c7f | 114 | { |
87352760 | 115 | base->command = command; |
116 | base->seqnum = seqnum; | |
117 | base->devid = 0; | |
118 | base->ep = 0; | |
c6956c97 | 119 | base->direction = 0; |
4d7b5c7f TH |
120 | } |
121 | ||
122 | static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb) | |
123 | { | |
124 | struct stub_priv *priv = (struct stub_priv *) urb->context; | |
125 | ||
126 | setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum); | |
4d7b5c7f TH |
127 | usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1); |
128 | } | |
129 | ||
130 | static void setup_ret_unlink_pdu(struct usbip_header *rpdu, | |
c6956c97 | 131 | struct stub_unlink *unlink) |
4d7b5c7f TH |
132 | { |
133 | setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum); | |
4d7b5c7f TH |
134 | rpdu->u.ret_unlink.status = unlink->status; |
135 | } | |
136 | ||
4d7b5c7f TH |
137 | static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev) |
138 | { | |
139 | unsigned long flags; | |
140 | struct stub_priv *priv, *tmp; | |
141 | ||
142 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
143 | ||
144 | list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) { | |
145 | list_move_tail(&priv->list, &sdev->priv_free); | |
146 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
147 | return priv; | |
148 | } | |
149 | ||
150 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
151 | ||
152 | return NULL; | |
153 | } | |
154 | ||
155 | static int stub_send_ret_submit(struct stub_device *sdev) | |
156 | { | |
157 | unsigned long flags; | |
158 | struct stub_priv *priv, *tmp; | |
159 | ||
160 | struct msghdr msg; | |
4d7b5c7f TH |
161 | size_t txsize; |
162 | ||
163 | size_t total_size = 0; | |
164 | ||
165 | while ((priv = dequeue_from_priv_tx(sdev)) != NULL) { | |
166 | int ret; | |
167 | struct urb *urb = priv->urb; | |
168 | struct usbip_header pdu_header; | |
36ac9b05 | 169 | struct usbip_iso_packet_descriptor *iso_buffer = NULL; |
28276a28 AM |
170 | struct kvec *iov = NULL; |
171 | int iovnum = 0; | |
4d7b5c7f TH |
172 | |
173 | txsize = 0; | |
174 | memset(&pdu_header, 0, sizeof(pdu_header)); | |
175 | memset(&msg, 0, sizeof(msg)); | |
4d7b5c7f | 176 | |
28276a28 AM |
177 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) |
178 | iovnum = 2 + urb->number_of_packets; | |
179 | else | |
180 | iovnum = 2; | |
4d7b5c7f | 181 | |
6baf139e | 182 | iov = kcalloc(iovnum, sizeof(struct kvec), GFP_KERNEL); |
28276a28 AM |
183 | |
184 | if (!iov) { | |
185 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC); | |
186 | return -1; | |
187 | } | |
188 | ||
189 | iovnum = 0; | |
4d7b5c7f TH |
190 | |
191 | /* 1. setup usbip_header */ | |
192 | setup_ret_submit_pdu(&pdu_header, urb); | |
28276a28 | 193 | usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n", |
c6956c97 | 194 | pdu_header.base.seqnum, urb); |
4d7b5c7f TH |
195 | usbip_header_correct_endian(&pdu_header, 1); |
196 | ||
28276a28 AM |
197 | iov[iovnum].iov_base = &pdu_header; |
198 | iov[iovnum].iov_len = sizeof(pdu_header); | |
199 | iovnum++; | |
4d7b5c7f TH |
200 | txsize += sizeof(pdu_header); |
201 | ||
202 | /* 2. setup transfer buffer */ | |
28276a28 | 203 | if (usb_pipein(urb->pipe) && |
c6956c97 | 204 | usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS && |
205 | urb->actual_length > 0) { | |
28276a28 AM |
206 | iov[iovnum].iov_base = urb->transfer_buffer; |
207 | iov[iovnum].iov_len = urb->actual_length; | |
208 | iovnum++; | |
4d7b5c7f | 209 | txsize += urb->actual_length; |
28276a28 | 210 | } else if (usb_pipein(urb->pipe) && |
c6956c97 | 211 | usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
28276a28 AM |
212 | /* |
213 | * For isochronous packets: actual length is the sum of | |
214 | * the actual length of the individual, packets, but as | |
215 | * the packet offsets are not changed there will be | |
216 | * padding between the packets. To optimally use the | |
217 | * bandwidth the padding is not transmitted. | |
218 | */ | |
219 | ||
220 | int i; | |
3eed8c03 | 221 | |
28276a28 | 222 | for (i = 0; i < urb->number_of_packets; i++) { |
c6956c97 | 223 | iov[iovnum].iov_base = urb->transfer_buffer + |
224 | urb->iso_frame_desc[i].offset; | |
225 | iov[iovnum].iov_len = | |
226 | urb->iso_frame_desc[i].actual_length; | |
28276a28 AM |
227 | iovnum++; |
228 | txsize += urb->iso_frame_desc[i].actual_length; | |
229 | } | |
230 | ||
231 | if (txsize != sizeof(pdu_header) + urb->actual_length) { | |
232 | dev_err(&sdev->interface->dev, | |
6bb3ee69 | 233 | "actual length of urb %d does not match iso packet sizes %zu\n", |
c6956c97 | 234 | urb->actual_length, |
235 | txsize-sizeof(pdu_header)); | |
28276a28 | 236 | kfree(iov); |
c6956c97 | 237 | usbip_event_add(&sdev->ud, |
238 | SDEV_EVENT_ERROR_TCP); | |
28276a28 AM |
239 | return -1; |
240 | } | |
4d7b5c7f TH |
241 | } |
242 | ||
243 | /* 3. setup iso_packet_descriptor */ | |
244 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { | |
245 | ssize_t len = 0; | |
246 | ||
247 | iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); | |
248 | if (!iso_buffer) { | |
249 | usbip_event_add(&sdev->ud, | |
250 | SDEV_EVENT_ERROR_MALLOC); | |
28276a28 | 251 | kfree(iov); |
4d7b5c7f TH |
252 | return -1; |
253 | } | |
254 | ||
28276a28 AM |
255 | iov[iovnum].iov_base = iso_buffer; |
256 | iov[iovnum].iov_len = len; | |
4d7b5c7f | 257 | txsize += len; |
28276a28 | 258 | iovnum++; |
4d7b5c7f TH |
259 | } |
260 | ||
28276a28 AM |
261 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, |
262 | iov, iovnum, txsize); | |
4d7b5c7f TH |
263 | if (ret != txsize) { |
264 | dev_err(&sdev->interface->dev, | |
265 | "sendmsg failed!, retval %d for %zd\n", | |
266 | ret, txsize); | |
28276a28 | 267 | kfree(iov); |
4d7b5c7f TH |
268 | kfree(iso_buffer); |
269 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); | |
270 | return -1; | |
271 | } | |
272 | ||
28276a28 | 273 | kfree(iov); |
4d7b5c7f | 274 | kfree(iso_buffer); |
4d7b5c7f TH |
275 | |
276 | total_size += txsize; | |
277 | } | |
278 | ||
4d7b5c7f | 279 | spin_lock_irqsave(&sdev->priv_lock, flags); |
4d7b5c7f TH |
280 | list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) { |
281 | stub_free_priv_and_urb(priv); | |
282 | } | |
4d7b5c7f TH |
283 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
284 | ||
285 | return total_size; | |
286 | } | |
287 | ||
4d7b5c7f TH |
288 | static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev) |
289 | { | |
290 | unsigned long flags; | |
291 | struct stub_unlink *unlink, *tmp; | |
292 | ||
293 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
294 | ||
295 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) { | |
296 | list_move_tail(&unlink->list, &sdev->unlink_free); | |
297 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
298 | return unlink; | |
299 | } | |
300 | ||
301 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
302 | ||
303 | return NULL; | |
304 | } | |
305 | ||
4d7b5c7f TH |
306 | static int stub_send_ret_unlink(struct stub_device *sdev) |
307 | { | |
308 | unsigned long flags; | |
309 | struct stub_unlink *unlink, *tmp; | |
310 | ||
311 | struct msghdr msg; | |
312 | struct kvec iov[1]; | |
313 | size_t txsize; | |
314 | ||
315 | size_t total_size = 0; | |
316 | ||
317 | while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) { | |
318 | int ret; | |
319 | struct usbip_header pdu_header; | |
320 | ||
321 | txsize = 0; | |
322 | memset(&pdu_header, 0, sizeof(pdu_header)); | |
323 | memset(&msg, 0, sizeof(msg)); | |
324 | memset(&iov, 0, sizeof(iov)); | |
325 | ||
b8868e45 | 326 | usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum); |
4d7b5c7f TH |
327 | |
328 | /* 1. setup usbip_header */ | |
329 | setup_ret_unlink_pdu(&pdu_header, unlink); | |
330 | usbip_header_correct_endian(&pdu_header, 1); | |
331 | ||
332 | iov[0].iov_base = &pdu_header; | |
333 | iov[0].iov_len = sizeof(pdu_header); | |
334 | txsize += sizeof(pdu_header); | |
335 | ||
336 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov, | |
337 | 1, txsize); | |
338 | if (ret != txsize) { | |
339 | dev_err(&sdev->interface->dev, | |
340 | "sendmsg failed!, retval %d for %zd\n", | |
341 | ret, txsize); | |
342 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); | |
343 | return -1; | |
344 | } | |
345 | ||
b8868e45 | 346 | usbip_dbg_stub_tx("send txdata\n"); |
4d7b5c7f TH |
347 | total_size += txsize; |
348 | } | |
349 | ||
4d7b5c7f TH |
350 | spin_lock_irqsave(&sdev->priv_lock, flags); |
351 | ||
352 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) { | |
353 | list_del(&unlink->list); | |
354 | kfree(unlink); | |
355 | } | |
356 | ||
357 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
358 | ||
359 | return total_size; | |
360 | } | |
361 | ||
9720b4bc | 362 | int stub_tx_loop(void *data) |
4d7b5c7f | 363 | { |
9720b4bc | 364 | struct usbip_device *ud = data; |
4d7b5c7f TH |
365 | struct stub_device *sdev = container_of(ud, struct stub_device, ud); |
366 | ||
9720b4bc | 367 | while (!kthread_should_stop()) { |
b8868e45 | 368 | if (usbip_event_happened(ud)) |
4d7b5c7f TH |
369 | break; |
370 | ||
371 | /* | |
372 | * send_ret_submit comes earlier than send_ret_unlink. stub_rx | |
373 | * looks at only priv_init queue. If the completion of a URB is | |
374 | * earlier than the receive of CMD_UNLINK, priv is moved to | |
375 | * priv_tx queue and stub_rx does not find the target priv. In | |
376 | * this case, vhci_rx receives the result of the submit request | |
377 | * and then receives the result of the unlink request. The | |
378 | * result of the submit is given back to the usbcore as the | |
379 | * completion of the unlink request. The request of the | |
380 | * unlink is ignored. This is ok because a driver who calls | |
381 | * usb_unlink_urb() understands the unlink was too late by | |
382 | * getting the status of the given-backed URB which has the | |
383 | * status of usb_submit_urb(). | |
384 | */ | |
385 | if (stub_send_ret_submit(sdev) < 0) | |
386 | break; | |
387 | ||
388 | if (stub_send_ret_unlink(sdev) < 0) | |
389 | break; | |
390 | ||
391 | wait_event_interruptible(sdev->tx_waitq, | |
c6956c97 | 392 | (!list_empty(&sdev->priv_tx) || |
393 | !list_empty(&sdev->unlink_tx) || | |
394 | kthread_should_stop())); | |
4d7b5c7f | 395 | } |
9720b4bc AB |
396 | |
397 | return 0; | |
4d7b5c7f | 398 | } |