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path: root/drivers/net/usb/raw_ip_net.c
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Diffstat (limited to 'drivers/net/usb/raw_ip_net.c')
-rw-r--r--drivers/net/usb/raw_ip_net.c1070
1 files changed, 1070 insertions, 0 deletions
diff --git a/drivers/net/usb/raw_ip_net.c b/drivers/net/usb/raw_ip_net.c
new file mode 100644
index 00000000000..35b69696647
--- /dev/null
+++ b/drivers/net/usb/raw_ip_net.c
@@ -0,0 +1,1070 @@
1/*
2 * raw_ip_net.c
3 *
4 * USB network driver for RAW-IP modems.
5 *
6 * Copyright (c) 2011, NVIDIA Corporation.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 */
22
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/kernel.h>
27#include <linux/fs.h>
28#include <linux/errno.h>
29#include <linux/types.h>
30#include <linux/etherdevice.h>
31#include <linux/usb.h>
32
33#define BASEBAND_USB_NET_DEV_NAME "rmnet%d"
34
35/* ethernet packet ethertype for IP packets */
36#define NET_IP_ETHERTYPE 0x08, 0x00
37
38#define TX_TIMEOUT 10
39
40#ifndef USB_NET_BUFSIZ
41#define USB_NET_BUFSIZ 8192
42#endif /* USB_NET_BUFSIZ */
43
44/* maximum interface number supported */
45#define MAX_INTFS 3
46
47MODULE_LICENSE("GPL");
48
49int g_i;
50
51int max_intfs = MAX_INTFS;
52unsigned long usb_net_raw_ip_vid = 0x1519;
53unsigned long usb_net_raw_ip_pid = 0x0020;
54unsigned long usb_net_raw_ip_intf[MAX_INTFS] = { 0x03, 0x05, 0x07 };
55unsigned long usb_net_raw_ip_rx_debug;
56unsigned long usb_net_raw_ip_tx_debug;
57
58module_param(max_intfs, int, 0644);
59MODULE_PARM_DESC(max_intfs, "usb net (raw-ip) - max. interfaces supported");
60module_param(usb_net_raw_ip_vid, ulong, 0644);
61MODULE_PARM_DESC(usb_net_raw_ip_vid, "usb net (raw-ip) - USB VID");
62module_param(usb_net_raw_ip_pid, ulong, 0644);
63MODULE_PARM_DESC(usb_net_raw_ip_pid, "usb net (raw-ip) - USB PID");
64module_param(usb_net_raw_ip_rx_debug, ulong, 0644);
65MODULE_PARM_DESC(usb_net_raw_ip_rx_debug, "usb net (raw-ip) - rx debug");
66module_param(usb_net_raw_ip_tx_debug, ulong, 0644);
67MODULE_PARM_DESC(usb_net_raw_ip_tx_debug, "usb net (raw-ip) - tx debug");
68
69struct baseband_usb {
70 int baseband_index;
71 struct net_device_stats stats;
72 struct {
73 struct usb_driver *driver;
74 struct usb_device *device;
75 struct usb_interface *interface;
76 struct {
77 struct {
78 unsigned int in;
79 unsigned int out;
80 } isoch, bulk, interrupt;
81 } pipe;
82 /* currently active rx urb */
83 struct urb *rx_urb;
84 /* currently active tx urb */
85 struct urb *tx_urb;
86 struct usb_anchor tx_urb_deferred;
87 struct workqueue_struct *tx_workqueue;
88 struct work_struct tx_work;
89 } usb;
90 struct urb *urb_r;
91 void *buff;
92};
93
94static struct baseband_usb *baseband_usb_net[MAX_INTFS] = { 0, 0, 0};
95
96static struct net_device *usb_net_raw_ip_dev[MAX_INTFS] = { 0, 0, 0};
97
98static unsigned int g_usb_interface_index[MAX_INTFS];
99static struct usb_interface *g_usb_interface[MAX_INTFS];
100
101static int usb_net_raw_ip_rx_urb_submit(struct baseband_usb *usb);
102static void usb_net_raw_ip_rx_urb_comp(struct urb *urb);
103
104static int usb_net_raw_ip_tx_urb_submit(struct baseband_usb *usb,
105 struct sk_buff *skb);
106static void usb_net_raw_ip_tx_urb_work(struct work_struct *work);
107static void usb_net_raw_ip_tx_urb_comp(struct urb *urb);
108
109static int baseband_usb_driver_probe(struct usb_interface *intf,
110 const struct usb_device_id *id)
111{
112 int i = g_i;
113
114 pr_debug("%s(%d) { intf %p id %p\n", __func__, __LINE__, intf, id);
115
116 pr_debug("i %d\n", i);
117
118 pr_debug("intf->cur_altsetting->desc.bInterfaceNumber %02x\n",
119 intf->cur_altsetting->desc.bInterfaceNumber);
120 pr_debug("intf->cur_altsetting->desc.bAlternateSetting %02x\n",
121 intf->cur_altsetting->desc.bAlternateSetting);
122 pr_debug("intf->cur_altsetting->desc.bNumEndpoints %02x\n",
123 intf->cur_altsetting->desc.bNumEndpoints);
124 pr_debug("intf->cur_altsetting->desc.bInterfaceClass %02x\n",
125 intf->cur_altsetting->desc.bInterfaceClass);
126 pr_debug("intf->cur_altsetting->desc.bInterfaceSubClass %02x\n",
127 intf->cur_altsetting->desc.bInterfaceSubClass);
128 pr_debug("intf->cur_altsetting->desc.bInterfaceProtocol %02x\n",
129 intf->cur_altsetting->desc.bInterfaceProtocol);
130 pr_debug("intf->cur_altsetting->desc.iInterface %02x\n",
131 intf->cur_altsetting->desc.iInterface);
132
133 if (g_usb_interface_index[i] !=
134 intf->cur_altsetting->desc.bInterfaceNumber) {
135 pr_debug("%s(%d) } -ENODEV\n", __func__, __LINE__);
136 return -ENODEV;
137 } else {
138 g_usb_interface[i] = intf;
139 }
140
141 pr_debug("%s(%d) }\n", __func__, __LINE__);
142 return 0;
143}
144
145static void baseband_usb_driver_disconnect(struct usb_interface *intf)
146{
147 int i;
148 struct urb *urb;
149
150 pr_debug("%s intf %p\n", __func__, intf);
151
152 for (i = 0; i < max_intfs; i++) {
153 pr_debug("[%d]\n", i);
154 if (!baseband_usb_net[i])
155 continue;
156 if (baseband_usb_net[i]->usb.interface != intf) {
157 pr_debug("%p != %p\n",
158 baseband_usb_net[i]->usb.interface, intf);
159 continue;
160 }
161 /* kill usb tx */
162 while ((urb = usb_get_from_anchor(&baseband_usb_net[i]->
163 usb.tx_urb_deferred)) != (struct urb *) 0) {
164 pr_info("%s: kill deferred tx urb %p\n",
165 __func__, urb);
166 /* decrement count from usb_get_from_anchor() */
167 usb_free_urb(urb);
168 /* kill tx urb */
169 usb_kill_urb(urb);
170 /* free tx urb + tx urb transfer buffer */
171 if (urb->transfer_buffer) {
172 kfree(urb->transfer_buffer);
173 urb->transfer_buffer = (void *) 0;
174 }
175 usb_free_urb(urb);
176 }
177 if (baseband_usb_net[i]->usb.tx_workqueue) {
178 flush_workqueue(baseband_usb_net[i]
179 ->usb.tx_workqueue);
180 }
181 if (baseband_usb_net[i]->usb.tx_urb) {
182 usb_kill_urb(baseband_usb_net[i]->usb.tx_urb);
183 baseband_usb_net[i]->usb.tx_urb
184 = (struct urb *) 0;
185 }
186 /* kill usb rx */
187 if (baseband_usb_net[i]->usb.rx_urb) {
188 usb_kill_urb(baseband_usb_net[i]->usb.rx_urb);
189 baseband_usb_net[i]->usb.rx_urb
190 = (struct urb *) 0;
191 }
192 /* mark interface as disconnected */
193 baseband_usb_net[i]->usb.interface
194 = (struct usb_interface *) 0;
195 }
196
197}
198
199#ifdef CONFIG_PM
200static int baseband_usb_driver_suspend(struct usb_interface *intf,
201 pm_message_t message)
202{
203 int i;
204
205 pr_debug("%s intf %p\n", __func__, intf);
206
207 for (i = 0; i < max_intfs; i++) {
208 pr_debug("[%d]\n", i);
209 if (!baseband_usb_net[i])
210 continue;
211 if (baseband_usb_net[i]->usb.interface != intf) {
212 pr_debug("%p != %p\n",
213 baseband_usb_net[i]->usb.interface, intf);
214 continue;
215 }
216 /* kill usb rx */
217 if (!baseband_usb_net[i]->usb.rx_urb) {
218 pr_debug("rx_usb already killed\n");
219 continue;
220 }
221 usb_kill_urb(baseband_usb_net[i]->usb.rx_urb);
222 baseband_usb_net[i]->usb.rx_urb = (struct urb *) 0;
223 }
224
225 return 0;
226}
227
228static int baseband_usb_driver_resume(struct usb_interface *intf)
229{
230 int i, err;
231
232 pr_debug("%s intf %p\n", __func__, intf);
233
234 for (i = 0; i < max_intfs; i++) {
235 pr_debug("[%d]\n", i);
236 if (!baseband_usb_net[i])
237 continue;
238 if (baseband_usb_net[i]->usb.interface != intf) {
239 pr_debug("%p != %p\n",
240 baseband_usb_net[i]->usb.interface, intf);
241 continue;
242 }
243 /* start usb rx */
244 if (baseband_usb_net[i]->usb.rx_urb) {
245 pr_debug("rx_usb already exists\n");
246 continue;
247 }
248 err = usb_net_raw_ip_rx_urb_submit(baseband_usb_net[i]);
249 if (err < 0) {
250 pr_err("submit rx failed - err %d\n", err);
251 continue;
252 }
253 }
254
255 return 0;
256}
257static int baseband_usb_driver_reset_resume(struct usb_interface *intf)
258{
259 pr_debug("%s intf %p\n", __func__, intf);
260 return baseband_usb_driver_resume(intf);
261}
262#endif /* CONFIG_PM */
263
264static struct usb_device_id baseband_usb_driver_id_table[MAX_INTFS][2];
265
266static char baseband_usb_driver_name[MAX_INTFS][32];
267
268static struct usb_driver baseband_usb_driver[MAX_INTFS] = {
269 {
270 .name = baseband_usb_driver_name[0],
271 .probe = baseband_usb_driver_probe,
272 .disconnect = baseband_usb_driver_disconnect,
273 .id_table = baseband_usb_driver_id_table[0],
274#ifdef CONFIG_PM
275 .suspend = baseband_usb_driver_suspend,
276 .resume = baseband_usb_driver_resume,
277 .reset_resume = baseband_usb_driver_reset_resume,
278 .supports_autosuspend = 1,
279#endif
280 },
281 {
282 .name = baseband_usb_driver_name[1],
283 .probe = baseband_usb_driver_probe,
284 .disconnect = baseband_usb_driver_disconnect,
285 .id_table = baseband_usb_driver_id_table[1],
286#ifdef CONFIG_PM
287 .suspend = baseband_usb_driver_suspend,
288 .resume = baseband_usb_driver_resume,
289 .reset_resume = baseband_usb_driver_reset_resume,
290 .supports_autosuspend = 1,
291#endif
292 },
293 {
294 .name = baseband_usb_driver_name[2],
295 .probe = baseband_usb_driver_probe,
296 .disconnect = baseband_usb_driver_disconnect,
297 .id_table = baseband_usb_driver_id_table[2],
298#ifdef CONFIG_PM
299 .suspend = baseband_usb_driver_suspend,
300 .resume = baseband_usb_driver_resume,
301 .reset_resume = baseband_usb_driver_reset_resume,
302 .supports_autosuspend = 1,
303#endif
304 },
305};
306
307static void find_usb_pipe(struct baseband_usb *usb)
308{
309 struct usb_device *usbdev = usb->usb.device;
310 struct usb_interface *intf = usb->usb.interface;
311 unsigned char numendpoint = intf->cur_altsetting->desc.bNumEndpoints;
312 struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
313 unsigned char n;
314
315 for (n = 0; n < numendpoint; n++) {
316 if (usb_endpoint_is_isoc_in(&endpoint[n].desc)) {
317 pr_debug("endpoint[%d] isochronous in\n", n);
318 usb->usb.pipe.isoch.in = usb_rcvisocpipe(usbdev,
319 endpoint[n].desc.bEndpointAddress);
320 } else if (usb_endpoint_is_isoc_out(&endpoint[n].desc)) {
321 pr_debug("endpoint[%d] isochronous out\n", n);
322 usb->usb.pipe.isoch.out = usb_sndisocpipe(usbdev,
323 endpoint[n].desc.bEndpointAddress);
324 } else if (usb_endpoint_is_bulk_in(&endpoint[n].desc)) {
325 pr_debug("endpoint[%d] bulk in\n", n);
326 usb->usb.pipe.bulk.in = usb_rcvbulkpipe(usbdev,
327 endpoint[n].desc.bEndpointAddress);
328 } else if (usb_endpoint_is_bulk_out(&endpoint[n].desc)) {
329 pr_debug("endpoint[%d] bulk out\n", n);
330 usb->usb.pipe.bulk.out = usb_sndbulkpipe(usbdev,
331 endpoint[n].desc.bEndpointAddress);
332 } else if (usb_endpoint_is_int_in(&endpoint[n].desc)) {
333 pr_debug("endpoint[%d] interrupt in\n", n);
334 usb->usb.pipe.interrupt.in = usb_rcvintpipe(usbdev,
335 endpoint[n].desc.bEndpointAddress);
336 } else if (usb_endpoint_is_int_out(&endpoint[n].desc)) {
337 pr_debug("endpoint[%d] interrupt out\n", n);
338 usb->usb.pipe.interrupt.out = usb_sndintpipe(usbdev,
339 endpoint[n].desc.bEndpointAddress);
340 } else {
341 pr_debug("endpoint[%d] skipped\n", n);
342 }
343 }
344}
345
346void baseband_usb_close(struct baseband_usb *usb);
347
348struct baseband_usb *baseband_usb_open(int index,
349 unsigned int vid,
350 unsigned int pid,
351 unsigned int intf)
352{
353 struct baseband_usb *usb;
354 int err;
355
356 pr_debug("baseband_usb_open {\n");
357
358 /* allocate baseband usb structure */
359 usb = kzalloc(sizeof(struct baseband_usb),
360 GFP_KERNEL);
361 if (!usb)
362 return (struct baseband_usb *) 0;
363
364 /* open usb driver */
365 sprintf(baseband_usb_driver_name[index],
366 "baseband_usb_%x_%x_%x",
367 vid, pid, intf);
368 baseband_usb_driver_id_table[index][0].match_flags =
369 USB_DEVICE_ID_MATCH_DEVICE;
370 baseband_usb_driver_id_table[index][0].idVendor = vid;
371 baseband_usb_driver_id_table[index][0].idProduct = pid;
372 g_usb_interface_index[index] = intf;
373 g_usb_interface[index] = (struct usb_interface *) 0;
374 err = usb_register(&baseband_usb_driver[index]);
375 if (err < 0) {
376 pr_err("cannot open usb driver - err %d\n", err);
377 kfree(usb);
378 return (struct baseband_usb *) 0;
379 }
380 usb->baseband_index = index;
381 usb->usb.driver = &baseband_usb_driver[index];
382 if (!g_usb_interface[index]) {
383 pr_err("cannot open usb driver - !g_usb_interface[%d]\n",
384 index);
385 usb_deregister(usb->usb.driver);
386 kfree(usb);
387 return (struct baseband_usb *) 0;
388 }
389 usb->usb.device = interface_to_usbdev(g_usb_interface[index]);
390 usb->usb.interface = g_usb_interface[index];
391 find_usb_pipe(usb);
392 usb->usb.rx_urb = (struct urb *) 0;
393 usb->usb.tx_urb = (struct urb *) 0;
394 g_usb_interface_index[index] = ~0U;
395 g_usb_interface[index] = (struct usb_interface *) 0;
396 pr_debug("usb->usb.driver->name %s\n", usb->usb.driver->name);
397 pr_debug("usb->usb.device %p\n", usb->usb.device);
398 pr_debug("usb->usb.interface %p\n", usb->usb.interface);
399 pr_debug("usb->usb.pipe.isoch.in %x\n", usb->usb.pipe.isoch.in);
400 pr_debug("usb->usb.pipe.isoch.out %x\n", usb->usb.pipe.isoch.out);
401 pr_debug("usb->usb.pipe.bulk.in %x\n", usb->usb.pipe.bulk.in);
402 pr_debug("usb->usb.pipe.bulk.out %x\n", usb->usb.pipe.bulk.out);
403 pr_debug("usb->usb.pipe.interrupt.in %x\n", usb->usb.pipe.interrupt.in);
404 pr_debug("usb->usb.pipe.interrupt.out %x\n",
405 usb->usb.pipe.interrupt.out);
406
407 pr_debug("baseband_usb_open }\n");
408 return usb;
409}
410
411void baseband_usb_close(struct baseband_usb *usb)
412{
413 pr_debug("baseband_usb_close {\n");
414
415 /* check input */
416 if (!usb)
417 return;
418
419 /* close usb driver */
420 if (usb->usb.driver) {
421 pr_debug("close usb driver {\n");
422 usb_deregister(usb->usb.driver);
423 usb->usb.driver = (struct usb_driver *) 0;
424 pr_debug("close usb driver }\n");
425 }
426
427 /* free baseband usb structure */
428 kfree(usb);
429
430 pr_debug("baseband_usb_close }\n");
431}
432
433static int baseband_usb_netdev_init(struct net_device *dev)
434{
435 pr_debug("baseband_usb_netdev_init\n");
436 return 0;
437}
438
439static void baseband_usb_netdev_uninit(struct net_device *dev)
440{
441 pr_debug("baseband_usb_netdev_uninit\n");
442}
443
444static int baseband_usb_netdev_open(struct net_device *dev)
445{
446 pr_debug("baseband_usb_netdev_open\n");
447 netif_start_queue(dev);
448 return 0;
449}
450
451static int baseband_usb_netdev_stop(struct net_device *dev)
452{
453 pr_debug("baseband_usb_netdev_stop\n");
454 netif_stop_queue(dev);
455 return 0;
456}
457
458static netdev_tx_t baseband_usb_netdev_start_xmit(
459 struct sk_buff *skb, struct net_device *dev)
460{
461 int i;
462 struct baseband_usb *usb;
463 int err;
464
465 pr_debug("baseband_usb_netdev_start_xmit\n");
466
467 /* check input */
468 if (!skb) {
469 pr_err("no skb\n");
470 return NETDEV_TX_BUSY;
471 }
472 if (!dev) {
473 pr_err("no net dev\n");
474 return NETDEV_TX_BUSY;
475 }
476
477 /* find index of network device which is transmitting */
478 for (i = 0; i < max_intfs; i++) {
479 if (usb_net_raw_ip_dev[i] == dev)
480 break;
481 }
482 if (i >= max_intfs) {
483 pr_err("unknown net dev %p\n", dev);
484 return NETDEV_TX_BUSY;
485 }
486 usb = baseband_usb_net[i];
487
488 /* submit tx urb */
489 err = usb_net_raw_ip_tx_urb_submit(usb, skb);
490 if (err < 0) {
491 pr_err("tx urb submit error\n");
492 usb->stats.tx_errors++;
493 return NETDEV_TX_BUSY;
494 }
495
496 return NETDEV_TX_OK;
497}
498
499static struct net_device_stats *baseband_usb_netdev_get_stats(
500 struct net_device *dev)
501{
502 int i;
503 for (i = 0; i < max_intfs; i++) {
504 if (dev == usb_net_raw_ip_dev[i]) {
505 pr_debug("%s idx(%d)\n", __func__, i);
506 return &baseband_usb_net[i]->stats;
507 }
508 }
509 pr_debug("%s mismatch dev, default idx(0)\n", __func__);
510 return &baseband_usb_net[0]->stats;
511}
512
513static struct net_device_ops usb_net_raw_ip_ops = {
514 .ndo_init = baseband_usb_netdev_init,
515 .ndo_uninit = baseband_usb_netdev_uninit,
516 .ndo_open = baseband_usb_netdev_open,
517 .ndo_stop = baseband_usb_netdev_stop,
518 .ndo_start_xmit = baseband_usb_netdev_start_xmit,
519 .ndo_get_stats = baseband_usb_netdev_get_stats,
520};
521
522static int usb_net_raw_ip_rx_urb_submit(struct baseband_usb *usb)
523{
524 struct urb *urb;
525 void *buf;
526 int err;
527
528 pr_debug("usb_net_raw_ip_rx_urb_submit { usb %p\n", usb);
529
530 /* check input */
531 if (!usb) {
532 pr_err("%s: !usb\n", __func__);
533 return -EINVAL;
534 }
535 if (!usb->usb.interface) {
536 pr_err("usb interface disconnected - not submitting rx urb\n");
537 return -EINVAL;
538 }
539 if (usb->usb.rx_urb) {
540 pr_err("previous urb still active\n");
541 return -EBUSY;
542 }
543 if (!usb->urb_r || !usb->buff) {
544 pr_err("no reusable rx urb found\n");
545 return -ENOMEM;
546 }
547
548 /* reuse rx urb */
549 urb = usb->urb_r;
550 buf = usb->buff;
551 usb_fill_bulk_urb(urb, usb->usb.device, usb->usb.pipe.bulk.in,
552 buf, USB_NET_BUFSIZ,
553 usb_net_raw_ip_rx_urb_comp,
554 usb);
555 urb->transfer_flags = 0;
556
557 /* submit rx urb */
558 usb_mark_last_busy(usb->usb.device);
559 usb->usb.rx_urb = urb;
560 err = usb_submit_urb(urb, GFP_ATOMIC);
561 if (err < 0) {
562 pr_err("usb_submit_urb() failed - err %d\n", err);
563 usb->usb.rx_urb = (struct urb *) 0;
564 return err;
565 }
566
567 pr_debug("usb_net_raw_ip_rx_urb_submit }\n");
568 return err;
569}
570
571static void usb_net_raw_ip_rx_urb_comp(struct urb *urb)
572{
573 struct baseband_usb *usb = (struct baseband_usb *) urb->context;
574 int i = usb->baseband_index;
575 struct sk_buff *skb;
576 unsigned char *dst;
577 unsigned char ethernet_header[14] = {
578 /* Destination MAC */
579 0x00, 0x00,
580 0x00, 0x00,
581 0x00, 0x00,
582 /* Source MAC */
583 0x00, 0x00,
584 0x00, 0x00,
585 0x00, 0x00,
586 /* EtherType */
587 NET_IP_ETHERTYPE,
588 };
589
590 pr_debug("usb_net_raw_ip_rx_urb_comp { urb %p\n", urb);
591
592 /* check input */
593 if (!urb) {
594 pr_err("no urb\n");
595 return;
596 }
597 switch (urb->status) {
598 case 0:
599 break;
600 case -ENOENT:
601 /* fall through */
602 case -ESHUTDOWN:
603 /* fall through */
604 case -EPROTO:
605 pr_info("%s: rx urb %p - link shutdown %d\n",
606 __func__, urb, urb->status);
607 goto err_exit;
608 default:
609 pr_info("%s: rx urb %p - status %d\n",
610 __func__, urb, urb->status);
611 break;
612 }
613
614 /* put rx urb data in rx buffer */
615 if (urb->actual_length) {
616 pr_debug("usb_net_raw_ip_rx_urb_comp - "
617 "urb->actual_length %d\n", urb->actual_length);
618 /* allocate skb with space for
619 * - dummy ethernet header
620 * - rx IP packet from modem
621 */
622 skb = netdev_alloc_skb(usb_net_raw_ip_dev[i],
623 NET_IP_ALIGN + 14 + urb->actual_length);
624 if (skb) {
625 /* generate a dummy ethernet header
626 * since modem sends IP packets without
627 * any ethernet headers
628 */
629 memcpy(ethernet_header + 0,
630 usb_net_raw_ip_dev[i]->dev_addr, 6);
631 memcpy(ethernet_header + 6,
632 "0x01\0x02\0x03\0x04\0x05\0x06", 6);
633 /* fill skb with
634 * - dummy ethernet header
635 * - rx IP packet from modem
636 */
637 skb_reserve(skb, NET_IP_ALIGN);
638 dst = skb_put(skb, 14);
639 memcpy(dst, ethernet_header, 14);
640 dst = skb_put(skb, urb->actual_length);
641 memcpy(dst, urb->transfer_buffer, urb->actual_length);
642 skb->protocol = eth_type_trans(skb,
643 usb_net_raw_ip_dev[i]);
644 /* pass skb to network stack */
645 if (netif_rx(skb) < 0) {
646 pr_err("usb_net_raw_ip_rx_urb_comp_work - "
647 "netif_rx(%p) failed\n", skb);
648 kfree_skb(skb);
649 usb->stats.rx_errors++;
650 } else {
651 usb->stats.rx_packets++;
652 usb->stats.rx_bytes +=
653 (14 + urb->actual_length);
654 }
655 } else {
656 pr_err("usb_net_raw_ip_rx_urb_comp_work - "
657 "netdev_alloc_skb() failed\n");
658 }
659 }
660
661 /* mark rx urb complete */
662 usb->usb.rx_urb = (struct urb *) 0;
663
664 /* submit next rx urb */
665 usb_net_raw_ip_rx_urb_submit(usb);
666 return;
667
668err_exit:
669 /* mark rx urb complete */
670 usb->usb.rx_urb = (struct urb *) 0;
671
672 pr_debug("usb_net_raw_ip_rx_urb_comp }\n");
673 return;
674}
675
676static int usb_net_raw_ip_setup_rx_urb( struct baseband_usb *usb)
677{
678 pr_debug("usb_net_raw_ip_setup_rx_urb {\n");
679
680 /* check input */
681 if (!usb) {
682 pr_err("%s: !usb\n", __func__);
683 return -EINVAL;
684 }
685 if (usb->urb_r) {
686 pr_err("%s: reusable rx urb already allocated\n", __func__);
687 return -EINVAL;
688 }
689
690 /* allocate reusable rx urb */
691 usb->urb_r = usb_alloc_urb(0, GFP_ATOMIC);
692 if (!usb->urb_r) {
693 pr_err("usb_alloc_urb() failed\n");
694 return -ENOMEM;
695 }
696 usb->buff = kzalloc(USB_NET_BUFSIZ, GFP_ATOMIC);
697 if (!usb->buff) {
698 pr_err("usb buffer kzalloc() failed\n");
699 usb_free_urb(usb->urb_r);
700 usb->urb_r = (struct urb *) 0;
701 return -ENOMEM;
702 }
703
704 pr_debug("usb_net_raw_setup_ip_rx_urb }\n");
705 return 0;
706}
707
708static void usb_net_raw_ip_free_rx_urb(struct baseband_usb *usb)
709{
710 pr_debug("usb_net_raw_ip_free_rx_urb {\n");
711
712 /* check input */
713 if (!usb) {
714 pr_err("%s: !usb\n", __func__);
715 return;
716 }
717
718 /* free reusable rx urb */
719 if (usb->urb_r) {
720 usb_free_urb(usb->urb_r);
721 usb->urb_r = (struct urb *) 0;
722 }
723 if (usb->buff) {
724 kfree(usb->buff);
725 usb->buff = (void *) 0;
726 }
727
728 pr_debug("usb_net_raw_ip_free_rx_urb }\n");
729}
730
731static int usb_net_raw_ip_tx_urb_submit(struct baseband_usb *usb,
732 struct sk_buff *skb)
733{
734 struct urb *urb;
735 unsigned char *buf;
736 int err;
737
738 pr_debug("usb_net_raw_ip_tx_urb_submit {\n");
739
740 /* check input */
741 if (!usb) {
742 pr_err("%s: !usb\n", __func__);
743 return -EINVAL;
744 }
745 if (!skb) {
746 pr_err("%s: !skb\n", __func__);
747 return -EINVAL;
748 }
749 if (!usb->usb.interface) {
750 pr_err("usb interface disconnected - not submitting tx urb\n");
751 kfree_skb(skb);
752 return -EINVAL;
753 }
754
755 /* allocate urb */
756 urb = usb_alloc_urb(0, GFP_ATOMIC);
757 if (!urb) {
758 pr_err("usb_alloc_urb() failed\n");
759 kfree_skb(skb);
760 return -ENOMEM;
761 }
762 buf = kzalloc(skb->len - 14, GFP_ATOMIC);
763 if (!buf) {
764 pr_err("usb buffer kzalloc() failed\n");
765 usb_free_urb(urb);
766 kfree_skb(skb);
767 return -ENOMEM;
768 }
769 err = skb_copy_bits(skb, 14, buf, skb->len - 14);
770 if (err < 0) {
771 pr_err("skb_copy_bits() failed - %d\n", err);
772 kfree(buf);
773 usb_free_urb(urb);
774 kfree_skb(skb);
775 return err;
776 }
777 usb_fill_bulk_urb(urb, usb->usb.device, usb->usb.pipe.bulk.out,
778 buf, skb->len - 14,
779 usb_net_raw_ip_tx_urb_comp,
780 usb);
781 urb->transfer_flags = URB_ZERO_PACKET;
782
783 /* queue tx urb work */
784 usb_anchor_urb(urb, &usb->usb.tx_urb_deferred);
785 queue_work(usb->usb.tx_workqueue, &usb->usb.tx_work);
786
787 /* free skb */
788 consume_skb(skb);
789
790 pr_debug("usb_net_raw_ip_tx_urb_submit }\n");
791 return 0;
792}
793
794static void usb_net_raw_ip_tx_urb_work(struct work_struct *work)
795{
796 struct baseband_usb *usb
797 = container_of(work, struct baseband_usb, usb.tx_work);
798 struct urb *urb;
799 int err;
800
801 pr_debug("usb_net_raw_ip_tx_urb_work {\n");
802
803 /* check if tx urb(s) queued */
804 if (!usb->usb.tx_urb && usb_anchor_empty(&usb->usb.tx_urb_deferred)) {
805 pr_debug("%s: nothing to do!\n", __func__);
806 return;
807 }
808
809 /* submit queued tx urb(s) */
810 while ((urb = usb_get_from_anchor(&usb->usb.tx_urb_deferred))
811 != (struct urb *) 0) {
812 /* decrement count from usb_get_from_anchor() */
813 usb_free_urb(urb);
814 /* check if usb interface disconnected */
815 if (!usb->usb.interface) {
816 pr_err("%s: not submitting tx urb %p"
817 " - interface disconnected\n",
818 __func__, urb);
819 if (urb->transfer_buffer) {
820 kfree(urb->transfer_buffer);
821 urb->transfer_buffer = (void *) 0;
822 }
823 usb_free_urb(urb);
824 continue;
825 }
826 /* autoresume before tx */
827 usb_mark_last_busy(usb->usb.device);
828 err = usb_autopm_get_interface(usb->usb.interface);
829 if (err < 0) {
830 pr_err("%s: usb_autopm_get_interface(%p) failed %d\n",
831 __func__, usb->usb.interface, err);
832 if (urb->transfer_buffer) {
833 kfree(urb->transfer_buffer);
834 urb->transfer_buffer = (void *) 0;
835 }
836 usb_free_urb(urb);
837 usb->stats.tx_errors++;
838 continue;
839 }
840 /* submit tx urb */
841 err = usb_submit_urb(urb, GFP_ATOMIC);
842 if (err < 0) {
843 pr_err("%s: usb_submit_urb(%p) failed - err %d\n",
844 __func__, urb, err);
845 usb_autopm_put_interface(usb->usb.interface);
846 if (urb->transfer_buffer) {
847 kfree(urb->transfer_buffer);
848 urb->transfer_buffer = (void *) 0;
849 }
850 usb_free_urb(urb);
851 continue;
852 }
853 /* free tx urb
854 * - actual urb free occurs when refcnt which was incremented
855 * in usb_submit_urb is decremented to 0 (usually after urb
856 * completion function returns)
857 * - tx urb transfer buffer will be freed in urb completion
858 * function
859 */
860 usb_free_urb(urb);
861 }
862
863 pr_debug("usb_net_raw_ip_tx_urb_work }\n");
864}
865
866static void usb_net_raw_ip_tx_urb_comp(struct urb *urb)
867{
868 struct baseband_usb *usb = (struct baseband_usb *) urb->context;
869
870 pr_debug("usb_net_raw_ip_tx_urb_comp {\n");
871
872 /* check input */
873 if (!urb) {
874 pr_err("no urb\n");
875 return;
876 }
877 switch (urb->status) {
878 case 0:
879 break;
880 case -ENOENT:
881 /* fall through */
882 case -ESHUTDOWN:
883 /* fall through */
884 case -EPROTO:
885 pr_info("%s: tx urb %p - link shutdown %d\n",
886 __func__, urb, urb->status);
887 goto err_exit;
888 default:
889 pr_info("%s: tx urb %p - status %d\n",
890 __func__, urb, urb->status);
891 break;
892 }
893 if (urb->status)
894 usb->stats.tx_errors++;
895 else {
896 usb->stats.tx_packets++;
897 usb->stats.tx_bytes += urb->transfer_buffer_length;
898 }
899 /* autosuspend after tx completed */
900 if (!usb->usb.interface) {
901 pr_err("%s: usb interface disconnected"
902 " before tx urb completed!\n",
903 __func__);
904 goto err_exit;
905 }
906 usb_autopm_put_interface(usb->usb.interface);
907
908err_exit:
909 /* free tx urb transfer buffer */
910 if (urb->transfer_buffer) {
911 kfree(urb->transfer_buffer);
912 urb->transfer_buffer = (void *) 0;
913 }
914
915 pr_debug("usb_net_raw_ip_tx_urb_comp }\n");
916}
917
918static int usb_net_raw_ip_init(void)
919{
920 int i;
921 int err;
922 char name[32];
923
924 pr_debug("usb_net_raw_ip_init {\n");
925
926 /* create multiple raw-ip network devices */
927 for (i = 0; i < max_intfs; i++) {
928 /* open baseband usb */
929 g_i = i;
930 baseband_usb_net[i] = baseband_usb_open(i, usb_net_raw_ip_vid,
931 usb_net_raw_ip_pid, usb_net_raw_ip_intf[i]);
932 if (!baseband_usb_net[i]) {
933 pr_err("cannot open baseband usb net\n");
934 err = -1;
935 goto error_exit;
936 }
937 /* register network device */
938 usb_net_raw_ip_dev[i] = alloc_netdev(0,
939 BASEBAND_USB_NET_DEV_NAME,
940 ether_setup);
941 if (!usb_net_raw_ip_dev[i]) {
942 pr_err("alloc_netdev() failed\n");
943 err = -ENOMEM;
944 goto error_exit;
945 }
946 usb_net_raw_ip_dev[i]->netdev_ops = &usb_net_raw_ip_ops;
947 usb_net_raw_ip_dev[i]->watchdog_timeo = TX_TIMEOUT;
948 random_ether_addr(usb_net_raw_ip_dev[i]->dev_addr);
949 err = register_netdev(usb_net_raw_ip_dev[i]);
950 if (err < 0) {
951 pr_err("cannot register network device - %d\n", err);
952 goto error_exit;
953 }
954 pr_debug("registered baseband usb network device"
955 " - dev %p name %s\n", usb_net_raw_ip_dev[i],
956 BASEBAND_USB_NET_DEV_NAME);
957 /* start usb rx */
958 err = usb_net_raw_ip_setup_rx_urb(baseband_usb_net[i]);
959 if (err < 0) {
960 pr_err("setup reusable rx urb failed - err %d\n", err);
961 goto error_exit;
962 }
963 err = usb_net_raw_ip_rx_urb_submit(baseband_usb_net[i]);
964 if (err < 0) {
965 pr_err("submit rx failed - err %d\n", err);
966 goto error_exit;
967 }
968 /* start usb tx */
969 init_usb_anchor(&baseband_usb_net[i]->usb.tx_urb_deferred);
970 sprintf(name, "raw_ip_tx_wq-%d",
971 baseband_usb_net[i]->baseband_index);
972 baseband_usb_net[i]->usb.tx_workqueue
973 = create_singlethread_workqueue(name);
974 if (!baseband_usb_net[i]->usb.tx_workqueue) {
975 pr_err("cannot create workqueue\n");
976 goto error_exit;
977 }
978 INIT_WORK(&baseband_usb_net[i]->usb.tx_work,
979 usb_net_raw_ip_tx_urb_work);
980 }
981
982 pr_debug("usb_net_raw_ip_init }\n");
983 return 0;
984
985error_exit:
986 /* destroy multiple raw-ip network devices */
987 for (i = 0; i < max_intfs; i++) {
988 /* unregister network device */
989 if (usb_net_raw_ip_dev[i]) {
990 unregister_netdev(usb_net_raw_ip_dev[i]);
991 free_netdev(usb_net_raw_ip_dev[i]);
992 usb_net_raw_ip_dev[i] = (struct net_device *) 0;
993 }
994 /* close baseband usb */
995 if (baseband_usb_net[i]) {
996 /* stop usb tx */
997 if (baseband_usb_net[i]->usb.tx_workqueue) {
998 destroy_workqueue(baseband_usb_net[i]
999 ->usb.tx_workqueue);
1000 baseband_usb_net[i]->usb.tx_workqueue
1001 = (struct workqueue_struct *) 0;
1002 }
1003 if (baseband_usb_net[i]->usb.tx_urb) {
1004 usb_kill_urb(baseband_usb_net[i]->usb.tx_urb);
1005 baseband_usb_net[i]->usb.tx_urb
1006 = (struct urb *) 0;
1007 }
1008 /* stop usb rx */
1009 if (baseband_usb_net[i]->usb.rx_urb) {
1010 usb_kill_urb(baseband_usb_net[i]->usb.rx_urb);
1011 baseband_usb_net[i]->usb.rx_urb
1012 = (struct urb *) 0;
1013 }
1014 usb_net_raw_ip_free_rx_urb(baseband_usb_net[i]);
1015 /* close usb */
1016 baseband_usb_close(baseband_usb_net[i]);
1017 baseband_usb_net[i] = (struct baseband_usb *) 0;
1018 }
1019 }
1020
1021 return err;
1022}
1023
1024static void usb_net_raw_ip_exit(void)
1025{
1026 int i;
1027
1028 pr_debug("usb_net_raw_ip_exit {\n");
1029
1030 /* destroy multiple raw-ip network devices */
1031 for (i = 0; i < max_intfs; i++) {
1032 /* unregister network device */
1033 if (usb_net_raw_ip_dev[i]) {
1034 unregister_netdev(usb_net_raw_ip_dev[i]);
1035 free_netdev(usb_net_raw_ip_dev[i]);
1036 usb_net_raw_ip_dev[i] = (struct net_device *) 0;
1037 }
1038 /* close baseband usb */
1039 if (baseband_usb_net[i]) {
1040 /* stop usb tx */
1041 if (baseband_usb_net[i]->usb.tx_workqueue) {
1042 destroy_workqueue(baseband_usb_net[i]
1043 ->usb.tx_workqueue);
1044 baseband_usb_net[i]->usb.tx_workqueue
1045 = (struct workqueue_struct *) 0;
1046 }
1047 if (baseband_usb_net[i]->usb.tx_urb) {
1048 usb_kill_urb(baseband_usb_net[i]->usb.tx_urb);
1049 baseband_usb_net[i]->usb.tx_urb
1050 = (struct urb *) 0;
1051 }
1052 /* stop usb rx */
1053 if (baseband_usb_net[i]->usb.rx_urb) {
1054 usb_kill_urb(baseband_usb_net[i]->usb.rx_urb);
1055 baseband_usb_net[i]->usb.rx_urb
1056 = (struct urb *) 0;
1057 }
1058 usb_net_raw_ip_free_rx_urb(baseband_usb_net[i]);
1059 /* close usb */
1060 baseband_usb_close(baseband_usb_net[i]);
1061 baseband_usb_net[i] = (struct baseband_usb *) 0;
1062 }
1063 }
1064
1065 pr_debug("usb_net_raw_ip_exit }\n");
1066}
1067
1068module_init(usb_net_raw_ip_init)
1069module_exit(usb_net_raw_ip_exit)
1070
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-16 08:46:42 -0400