?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / net / usb / cdc_ncm.c
blobd5c47a2a62dcc36391809f93b2774a5af732709d
1 /*
2 * cdc_ncm.c
3 *
4 * Copyright (C) ST-Ericsson 2010-2012
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
7 *
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
10 *
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
13 *
14 * This software is available to you under a choice of one of two
15 * licenses. You may choose this file to be licensed under the terms
16 * of the GNU General Public License (GPL) Version 2 or the 2-clause
17 * BSD license listed below:
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <linux/module.h>
42 #include <linux/netdevice.h>
43 #include <linux/ctype.h>
44 #include <linux/etherdevice.h>
45 #include <linux/ethtool.h>
46 #include <linux/kstrtox.h>
47 #include <linux/workqueue.h>
48 #include <linux/mii.h>
49 #include <linux/crc32.h>
50 #include <linux/usb.h>
51 #include <linux/hrtimer.h>
52 #include <linux/atomic.h>
53 #include <linux/usb/usbnet.h>
54 #include <linux/usb/cdc.h>
55 #include <linux/usb/cdc_ncm.h>
56
57 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
58 static bool prefer_mbim = true;
59 #else
60 static bool prefer_mbim;
61 #endif
62 module_param(prefer_mbim, bool, 0644);
63 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
64
65 static void cdc_ncm_txpath_bh(struct tasklet_struct *t);
66 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
67 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
68 static struct usb_driver cdc_ncm_driver;
69
70 struct cdc_ncm_stats {
71 char stat_string[ETH_GSTRING_LEN];
72 int sizeof_stat;
73 int stat_offset;
74 };
75
76 #define CDC_NCM_STAT(str, m) { \
77 .stat_string = str, \
78 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
79 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
80 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m)
81
82 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
83 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
84 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
85 CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
86 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
87 CDC_NCM_SIMPLE_STAT(tx_overhead),
88 CDC_NCM_SIMPLE_STAT(tx_ntbs),
89 CDC_NCM_SIMPLE_STAT(rx_overhead),
90 CDC_NCM_SIMPLE_STAT(rx_ntbs),
91 };
92
93 #define CDC_NCM_LOW_MEM_MAX_CNT 10
94
95 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
96 {
97 switch (sset) {
98 case ETH_SS_STATS:
99 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
100 default:
101 return -EOPNOTSUPP;
102 }
103 }
104
105 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
106 struct ethtool_stats __always_unused *stats,
107 u64 *data)
108 {
109 struct usbnet *dev = netdev_priv(netdev);
110 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
111 int i;
112 char *p = NULL;
113
114 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
115 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
116 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
117 }
118 }
119
120 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
121 {
122 u8 *p = data;
123 int i;
124
125 switch (stringset) {
126 case ETH_SS_STATS:
127 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
128 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
129 p += ETH_GSTRING_LEN;
130 }
131 }
132 }
133
134 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
135
136 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
137 .get_link = usbnet_get_link,
138 .nway_reset = usbnet_nway_reset,
139 .get_drvinfo = usbnet_get_drvinfo,
140 .get_msglevel = usbnet_get_msglevel,
141 .set_msglevel = usbnet_set_msglevel,
142 .get_ts_info = ethtool_op_get_ts_info,
143 .get_sset_count = cdc_ncm_get_sset_count,
144 .get_strings = cdc_ncm_get_strings,
145 .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
146 .get_link_ksettings = usbnet_get_link_ksettings_internal,
147 .set_link_ksettings = NULL,
148 };
149
150 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
151 {
152 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
153 u32 val, max, min;
154
155 /* clamp new_rx to sane values */
156 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
157 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
158
159 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
160 if (max < min) {
161 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
162 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
163 max = min;
164 }
165
166 val = clamp_t(u32, new_rx, min, max);
167 if (val != new_rx)
168 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
169
170 return val;
171 }
172
173 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
174 {
175 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
176 u32 val, max, min;
177
178 /* clamp new_tx to sane values */
179 if (ctx->is_ndp16)
180 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
181 else
182 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth32);
183
184 if (le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) == 0)
185 max = CDC_NCM_NTB_MAX_SIZE_TX; /* dwNtbOutMaxSize not set */
186 else
187 max = clamp_t(u32, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize),
188 USB_CDC_NCM_NTB_MIN_OUT_SIZE,
189 CDC_NCM_NTB_MAX_SIZE_TX);
190
191 /* some devices set dwNtbOutMaxSize too low for the above default */
192 min = min(min, max);
193
194 val = clamp_t(u32, new_tx, min, max);
195 if (val != new_tx)
196 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
197
198 return val;
199 }
200
201 static ssize_t min_tx_pkt_show(struct device *d,
202 struct device_attribute *attr, char *buf)
203 {
204 struct usbnet *dev = netdev_priv(to_net_dev(d));
205 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
206
207 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
208 }
209
210 static ssize_t rx_max_show(struct device *d,
211 struct device_attribute *attr, char *buf)
212 {
213 struct usbnet *dev = netdev_priv(to_net_dev(d));
214 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
215
216 return sprintf(buf, "%u\n", ctx->rx_max);
217 }
218
219 static ssize_t tx_max_show(struct device *d,
220 struct device_attribute *attr, char *buf)
221 {
222 struct usbnet *dev = netdev_priv(to_net_dev(d));
223 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
224
225 return sprintf(buf, "%u\n", ctx->tx_max);
226 }
227
228 static ssize_t tx_timer_usecs_show(struct device *d,
229 struct device_attribute *attr, char *buf)
230 {
231 struct usbnet *dev = netdev_priv(to_net_dev(d));
232 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
233
234 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
235 }
236
237 static ssize_t min_tx_pkt_store(struct device *d,
238 struct device_attribute *attr,
239 const char *buf, size_t len)
240 {
241 struct usbnet *dev = netdev_priv(to_net_dev(d));
242 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
243 unsigned long val;
244
245 /* no need to restrict values - anything from 0 to infinity is OK */
246 if (kstrtoul(buf, 0, &val))
247 return -EINVAL;
248
249 ctx->min_tx_pkt = val;
250 return len;
251 }
252
253 static ssize_t rx_max_store(struct device *d,
254 struct device_attribute *attr,
255 const char *buf, size_t len)
256 {
257 struct usbnet *dev = netdev_priv(to_net_dev(d));
258 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
259 unsigned long val;
260
261 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
262 return -EINVAL;
263
264 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
265 return len;
266 }
267
268 static ssize_t tx_max_store(struct device *d,
269 struct device_attribute *attr,
270 const char *buf, size_t len)
271 {
272 struct usbnet *dev = netdev_priv(to_net_dev(d));
273 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
274 unsigned long val;
275
276 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
277 return -EINVAL;
278
279 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
280 return len;
281 }
282
283 static ssize_t tx_timer_usecs_store(struct device *d,
284 struct device_attribute *attr,
285 const char *buf, size_t len)
286 {
287 struct usbnet *dev = netdev_priv(to_net_dev(d));
288 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
289 ssize_t ret;
290 unsigned long val;
291
292 ret = kstrtoul(buf, 0, &val);
293 if (ret)
294 return ret;
295 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
296 return -EINVAL;
297
298 spin_lock_bh(&ctx->mtx);
299 ctx->timer_interval = val * NSEC_PER_USEC;
300 if (!ctx->timer_interval)
301 ctx->tx_timer_pending = 0;
302 spin_unlock_bh(&ctx->mtx);
303 return len;
304 }
305
306 static DEVICE_ATTR_RW(min_tx_pkt);
307 static DEVICE_ATTR_RW(rx_max);
308 static DEVICE_ATTR_RW(tx_max);
309 static DEVICE_ATTR_RW(tx_timer_usecs);
310
311 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
312 {
313 struct usbnet *dev = netdev_priv(to_net_dev(d));
314 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
315
316 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
317 }
318
319 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
320 {
321 struct usbnet *dev = netdev_priv(to_net_dev(d));
322 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
323 bool enable;
324
325 if (kstrtobool(buf, &enable))
326 return -EINVAL;
327
328 /* no change? */
329 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
330 return len;
331
332 if (enable) {
333 if (ctx->is_ndp16 && !ctx->delayed_ndp16) {
334 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
335 if (!ctx->delayed_ndp16)
336 return -ENOMEM;
337 }
338 if (!ctx->is_ndp16 && !ctx->delayed_ndp32) {
339 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
340 if (!ctx->delayed_ndp32)
341 return -ENOMEM;
342 }
343 }
344
345 /* flush pending data before changing flag */
346 netif_tx_lock_bh(dev->net);
347 usbnet_start_xmit(NULL, dev->net);
348 spin_lock_bh(&ctx->mtx);
349 if (enable)
350 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
351 else
352 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
353 spin_unlock_bh(&ctx->mtx);
354 netif_tx_unlock_bh(dev->net);
355
356 return len;
357 }
358 static DEVICE_ATTR_RW(ndp_to_end);
359
360 #define NCM_PARM_ATTR(name, format, tocpu) \
361 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
362 { \
363 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
364 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
365 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
366 } \
367 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
368
369 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
370 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
371 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
372 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
373 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
374 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
375 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
376 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
377 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
378 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
379
380 static struct attribute *cdc_ncm_sysfs_attrs[] = {
381 &dev_attr_min_tx_pkt.attr,
382 &dev_attr_ndp_to_end.attr,
383 &dev_attr_rx_max.attr,
384 &dev_attr_tx_max.attr,
385 &dev_attr_tx_timer_usecs.attr,
386 &dev_attr_bmNtbFormatsSupported.attr,
387 &dev_attr_dwNtbInMaxSize.attr,
388 &dev_attr_wNdpInDivisor.attr,
389 &dev_attr_wNdpInPayloadRemainder.attr,
390 &dev_attr_wNdpInAlignment.attr,
391 &dev_attr_dwNtbOutMaxSize.attr,
392 &dev_attr_wNdpOutDivisor.attr,
393 &dev_attr_wNdpOutPayloadRemainder.attr,
394 &dev_attr_wNdpOutAlignment.attr,
395 &dev_attr_wNtbOutMaxDatagrams.attr,
396 NULL,
397 };
398
399 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
400 .name = "cdc_ncm",
401 .attrs = cdc_ncm_sysfs_attrs,
402 };
403
404 /* handle rx_max and tx_max changes */
405 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
406 {
407 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
408 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
409 u32 val;
410
411 val = cdc_ncm_check_rx_max(dev, new_rx);
412
413 /* inform device about NTB input size changes */
414 if (val != ctx->rx_max) {
415 __le32 dwNtbInMaxSize = cpu_to_le32(val);
416
417 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
418
419 /* tell device to use new size */
420 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
421 USB_TYPE_CLASS | USB_DIR_OUT
422 | USB_RECIP_INTERFACE,
423 0, iface_no, &dwNtbInMaxSize, 4) < 0)
424 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
425 else
426 ctx->rx_max = val;
427 }
428
429 /* usbnet use these values for sizing rx queues */
430 if (dev->rx_urb_size != ctx->rx_max) {
431 dev->rx_urb_size = ctx->rx_max;
432 if (netif_running(dev->net))
433 usbnet_unlink_rx_urbs(dev);
434 }
435
436 val = cdc_ncm_check_tx_max(dev, new_tx);
437 if (val != ctx->tx_max)
438 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
439
440 /* Adding a pad byte here if necessary simplifies the handling
441 * in cdc_ncm_fill_tx_frame, making tx_max always represent
442 * the real skb max size.
443 *
444 * We cannot use dev->maxpacket here because this is called from
445 * .bind which is called before usbnet sets up dev->maxpacket
446 */
447 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
448 val % usb_maxpacket(dev->udev, dev->out) == 0)
449 val++;
450
451 /* we might need to flush any pending tx buffers if running */
452 if (netif_running(dev->net) && val > ctx->tx_max) {
453 netif_tx_lock_bh(dev->net);
454 usbnet_start_xmit(NULL, dev->net);
455 /* make sure tx_curr_skb is reallocated if it was empty */
456 if (ctx->tx_curr_skb) {
457 dev_kfree_skb_any(ctx->tx_curr_skb);
458 ctx->tx_curr_skb = NULL;
459 }
460 ctx->tx_max = val;
461 netif_tx_unlock_bh(dev->net);
462 } else {
463 ctx->tx_max = val;
464 }
465
466 dev->hard_mtu = ctx->tx_max;
467
468 /* max qlen depend on hard_mtu and rx_urb_size */
469 usbnet_update_max_qlen(dev);
470
471 /* never pad more than 3 full USB packets per transfer */
472 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out),
473 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
474 }
475
476 /* helpers for NCM and MBIM differences */
477 static u8 cdc_ncm_flags(struct usbnet *dev)
478 {
479 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
480
481 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
482 return ctx->mbim_desc->bmNetworkCapabilities;
483 if (ctx->func_desc)
484 return ctx->func_desc->bmNetworkCapabilities;
485 return 0;
486 }
487
488 static int cdc_ncm_eth_hlen(struct usbnet *dev)
489 {
490 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
491 return 0;
492 return ETH_HLEN;
493 }
494
495 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
496 {
497 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
498 return CDC_MBIM_MIN_DATAGRAM_SIZE;
499 return CDC_NCM_MIN_DATAGRAM_SIZE;
500 }
501
502 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
503 {
504 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
505
506 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
507 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
508 if (ctx->ether_desc)
509 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
510 return CDC_NCM_MAX_DATAGRAM_SIZE;
511 }
512
513 /* initial one-time device setup. MUST be called with the data interface
514 * in altsetting 0
515 */
516 static int cdc_ncm_init(struct usbnet *dev)
517 {
518 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
519 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
520 int err;
521
522 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
523 USB_TYPE_CLASS | USB_DIR_IN
524 |USB_RECIP_INTERFACE,
525 0, iface_no, &ctx->ncm_parm,
526 sizeof(ctx->ncm_parm));
527 if (err < 0) {
528 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
529 return err; /* GET_NTB_PARAMETERS is required */
530 }
531
532 /* set CRC Mode */
533 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
534 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
535 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
536 USB_TYPE_CLASS | USB_DIR_OUT
537 | USB_RECIP_INTERFACE,
538 USB_CDC_NCM_CRC_NOT_APPENDED,
539 iface_no, NULL, 0);
540 if (err < 0)
541 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
542 }
543
544 /* use ndp16 by default */
545 ctx->is_ndp16 = 1;
546
547 /* set NTB format, if both formats are supported.
548 *
549 * "The host shall only send this command while the NCM Data
550 * Interface is in alternate setting 0."
551 */
552 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
553 USB_CDC_NCM_NTB32_SUPPORTED) {
554 if (ctx->drvflags & CDC_NCM_FLAG_PREFER_NTB32) {
555 ctx->is_ndp16 = 0;
556 dev_dbg(&dev->intf->dev, "Setting NTB format to 32-bit\n");
557 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
558 USB_TYPE_CLASS | USB_DIR_OUT
559 | USB_RECIP_INTERFACE,
560 USB_CDC_NCM_NTB32_FORMAT,
561 iface_no, NULL, 0);
562 } else {
563 ctx->is_ndp16 = 1;
564 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
565 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
566 USB_TYPE_CLASS | USB_DIR_OUT
567 | USB_RECIP_INTERFACE,
568 USB_CDC_NCM_NTB16_FORMAT,
569 iface_no, NULL, 0);
570 }
571 if (err < 0) {
572 ctx->is_ndp16 = 1;
573 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
574 }
575 }
576
577 /* set initial device values */
578 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
579 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
580 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
581 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
582 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
583 /* devices prior to NCM Errata shall set this field to zero */
584 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
585
586 dev_dbg(&dev->intf->dev,
587 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
588 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
589 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
590
591 /* max count of tx datagrams */
592 if ((ctx->tx_max_datagrams == 0) ||
593 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
594 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
595
596 /* set up maximum NDP size */
597 if (ctx->is_ndp16)
598 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
599 else
600 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp32) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe32);
601
602 /* initial coalescing timer interval */
603 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
604
605 return 0;
606 }
607
608 /* set a new max datagram size */
609 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
610 {
611 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
612 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
613 __le16 max_datagram_size;
614 u16 mbim_mtu;
615 int err;
616
617 /* set default based on descriptors */
618 ctx->max_datagram_size = clamp_t(u32, new_size,
619 cdc_ncm_min_dgram_size(dev),
620 CDC_NCM_MAX_DATAGRAM_SIZE);
621
622 /* inform the device about the selected Max Datagram Size? */
623 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
624 goto out;
625
626 /* read current mtu value from device */
627 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
628 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
629 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
630 if (err != sizeof(max_datagram_size)) {
631 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
632 goto out;
633 }
634
635 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
636 goto out;
637
638 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
639 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
640 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
641 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
642 if (err < 0)
643 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
644
645 out:
646 /* set MTU to max supported by the device if necessary */
647 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
648
649 /* do not exceed operator preferred MTU */
650 if (ctx->mbim_extended_desc) {
651 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
652 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
653 dev->net->mtu = mbim_mtu;
654 }
655 }
656
657 static void cdc_ncm_fix_modulus(struct usbnet *dev)
658 {
659 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
660 u32 val;
661
662 /*
663 * verify that the structure alignment is:
664 * - power of two
665 * - not greater than the maximum transmit length
666 * - not less than four bytes
667 */
668 val = ctx->tx_ndp_modulus;
669
670 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
671 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
672 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
673 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
674 }
675
676 /*
677 * verify that the payload alignment is:
678 * - power of two
679 * - not greater than the maximum transmit length
680 * - not less than four bytes
681 */
682 val = ctx->tx_modulus;
683
684 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
685 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
686 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
687 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
688 }
689
690 /* verify the payload remainder */
691 if (ctx->tx_remainder >= ctx->tx_modulus) {
692 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
693 ctx->tx_remainder = 0;
694 }
695
696 /* adjust TX-remainder according to NCM specification. */
697 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
698 (ctx->tx_modulus - 1));
699 }
700
701 static int cdc_ncm_setup(struct usbnet *dev)
702 {
703 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
704 u32 def_rx, def_tx;
705
706 /* be conservative when selecting initial buffer size to
707 * increase the number of hosts this will work for
708 */
709 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
710 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
711 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
712 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
713
714 /* clamp rx_max and tx_max and inform device */
715 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
716
717 /* sanitize the modulus and remainder values */
718 cdc_ncm_fix_modulus(dev);
719
720 /* set max datagram size */
721 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
722 return 0;
723 }
724
725 static void
726 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
727 {
728 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
729 u8 ep;
730
731 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
732 e = intf->cur_altsetting->endpoint + ep;
733
734 /* ignore endpoints which cannot transfer data */
735 if (!usb_endpoint_maxp(&e->desc))
736 continue;
737
738 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
739 case USB_ENDPOINT_XFER_INT:
740 if (usb_endpoint_dir_in(&e->desc)) {
741 if (!dev->status)
742 dev->status = e;
743 }
744 break;
745
746 case USB_ENDPOINT_XFER_BULK:
747 if (usb_endpoint_dir_in(&e->desc)) {
748 if (!in)
749 in = e;
750 } else {
751 if (!out)
752 out = e;
753 }
754 break;
755
756 default:
757 break;
758 }
759 }
760 if (in && !dev->in)
761 dev->in = usb_rcvbulkpipe(dev->udev,
762 in->desc.bEndpointAddress &
763 USB_ENDPOINT_NUMBER_MASK);
764 if (out && !dev->out)
765 dev->out = usb_sndbulkpipe(dev->udev,
766 out->desc.bEndpointAddress &
767 USB_ENDPOINT_NUMBER_MASK);
768 }
769
770 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
771 {
772 if (ctx == NULL)
773 return;
774
775 if (ctx->tx_rem_skb != NULL) {
776 dev_kfree_skb_any(ctx->tx_rem_skb);
777 ctx->tx_rem_skb = NULL;
778 }
779
780 if (ctx->tx_curr_skb != NULL) {
781 dev_kfree_skb_any(ctx->tx_curr_skb);
782 ctx->tx_curr_skb = NULL;
783 }
784
785 if (ctx->is_ndp16)
786 kfree(ctx->delayed_ndp16);
787 else
788 kfree(ctx->delayed_ndp32);
789
790 kfree(ctx);
791 }
792
793 /* we need to override the usbnet change_mtu ndo for two reasons:
794 * - respect the negotiated maximum datagram size
795 * - avoid unwanted changes to rx and tx buffers
796 */
797 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
798 {
799 struct usbnet *dev = netdev_priv(net);
800
801 WRITE_ONCE(net->mtu, new_mtu);
802 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
803
804 return 0;
805 }
806 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
807
808 static const struct net_device_ops cdc_ncm_netdev_ops = {
809 .ndo_open = usbnet_open,
810 .ndo_stop = usbnet_stop,
811 .ndo_start_xmit = usbnet_start_xmit,
812 .ndo_tx_timeout = usbnet_tx_timeout,
813 .ndo_set_rx_mode = usbnet_set_rx_mode,
814 .ndo_get_stats64 = dev_get_tstats64,
815 .ndo_change_mtu = cdc_ncm_change_mtu,
816 .ndo_set_mac_address = eth_mac_addr,
817 .ndo_validate_addr = eth_validate_addr,
818 };
819
820 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
821 {
822 struct cdc_ncm_ctx *ctx;
823 struct usb_driver *driver;
824 u8 *buf;
825 int len;
826 int temp;
827 u8 iface_no;
828 struct usb_cdc_parsed_header hdr;
829
830 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
831 if (!ctx)
832 return -ENOMEM;
833
834 ctx->dev = dev;
835
836 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
837 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
838 tasklet_setup(&ctx->bh, cdc_ncm_txpath_bh);
839 atomic_set(&ctx->stop, 0);
840 spin_lock_init(&ctx->mtx);
841
842 /* store ctx pointer in device data field */
843 dev->data[0] = (unsigned long)ctx;
844
845 /* only the control interface can be successfully probed */
846 ctx->control = intf;
847
848 /* get some pointers */
849 driver = driver_of(intf);
850 buf = intf->cur_altsetting->extra;
851 len = intf->cur_altsetting->extralen;
852
853 /* parse through descriptors associated with control interface */
854 cdc_parse_cdc_header(&hdr, intf, buf, len);
855
856 if (hdr.usb_cdc_union_desc)
857 ctx->data = usb_ifnum_to_if(dev->udev,
858 hdr.usb_cdc_union_desc->bSlaveInterface0);
859 ctx->ether_desc = hdr.usb_cdc_ether_desc;
860 ctx->func_desc = hdr.usb_cdc_ncm_desc;
861 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
862 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
863
864 /* some buggy devices have an IAD but no CDC Union */
865 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
866 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
867 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
868 }
869
870 /* check if we got everything */
871 if (!ctx->data) {
872 dev_err(&intf->dev, "CDC Union missing and no IAD found\n");
873 goto error;
874 }
875 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
876 if (!ctx->mbim_desc) {
877 dev_err(&intf->dev, "MBIM functional descriptor missing\n");
878 goto error;
879 }
880 } else {
881 if (!ctx->ether_desc || !ctx->func_desc) {
882 dev_err(&intf->dev, "NCM or ECM functional descriptors missing\n");
883 goto error;
884 }
885 }
886
887 /* claim data interface, if different from control */
888 if (ctx->data != ctx->control) {
889 temp = usb_driver_claim_interface(driver, ctx->data, dev);
890 if (temp) {
891 dev_err(&intf->dev, "failed to claim data intf\n");
892 goto error;
893 }
894 }
895
896 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
897
898 /* Device-specific flags */
899 ctx->drvflags = drvflags;
900
901 /* Reset data interface. Some devices will not reset properly
902 * unless they are configured first. Toggle the altsetting to
903 * force a reset.
904 * Some other devices do not work properly with this procedure
905 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
906 */
907 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
908 usb_set_interface(dev->udev, iface_no, data_altsetting);
909
910 temp = usb_set_interface(dev->udev, iface_no, 0);
911 if (temp) {
912 dev_dbg(&intf->dev, "set interface failed\n");
913 goto error2;
914 }
915
916 /* initialize basic device settings */
917 if (cdc_ncm_init(dev))
918 goto error2;
919
920 /* Some firmwares need a pause here or they will silently fail
921 * to set up the interface properly. This value was decided
922 * empirically on a Sierra Wireless MC7455 running 02.08.02.00
923 * firmware.
924 */
925 usleep_range(10000, 20000);
926
927 /* configure data interface */
928 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
929 if (temp) {
930 dev_dbg(&intf->dev, "set interface failed\n");
931 goto error2;
932 }
933
934 cdc_ncm_find_endpoints(dev, ctx->data);
935 cdc_ncm_find_endpoints(dev, ctx->control);
936 if (!dev->in || !dev->out ||
937 (!dev->status && dev->driver_info->flags & FLAG_LINK_INTR)) {
938 dev_dbg(&intf->dev, "failed to collect endpoints\n");
939 goto error2;
940 }
941
942 usb_set_intfdata(ctx->control, dev);
943
944 if (ctx->ether_desc) {
945 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
946 if (temp) {
947 dev_err(&intf->dev, "failed to get mac address\n");
948 goto error2;
949 }
950 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
951 }
952
953 /* finish setting up the device specific data */
954 cdc_ncm_setup(dev);
955
956 /* Allocate the delayed NDP if needed. */
957 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
958 if (ctx->is_ndp16) {
959 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
960 if (!ctx->delayed_ndp16)
961 goto error2;
962 } else {
963 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
964 if (!ctx->delayed_ndp32)
965 goto error2;
966 }
967 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
968 }
969
970 /* override ethtool_ops */
971 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
972
973 /* add our sysfs attrs */
974 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
975
976 /* must handle MTU changes */
977 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
978 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
979
980 return 0;
981
982 error2:
983 usb_set_intfdata(ctx->control, NULL);
984 usb_set_intfdata(ctx->data, NULL);
985 if (ctx->data != ctx->control)
986 usb_driver_release_interface(driver, ctx->data);
987 error:
988 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
989 dev->data[0] = 0;
990 dev_info(&intf->dev, "bind() failure\n");
991 return -ENODEV;
992 }
993 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
994
995 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
996 {
997 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
998 struct usb_driver *driver = driver_of(intf);
999
1000 if (ctx == NULL)
1001 return; /* no setup */
1002
1003 atomic_set(&ctx->stop, 1);
1004
1005 hrtimer_cancel(&ctx->tx_timer);
1006
1007 tasklet_kill(&ctx->bh);
1008
1009 /* handle devices with combined control and data interface */
1010 if (ctx->control == ctx->data)
1011 ctx->data = NULL;
1012
1013 /* disconnect master --> disconnect slave */
1014 if (intf == ctx->control && ctx->data) {
1015 usb_set_intfdata(ctx->data, NULL);
1016 usb_driver_release_interface(driver, ctx->data);
1017 ctx->data = NULL;
1018
1019 } else if (intf == ctx->data && ctx->control) {
1020 usb_set_intfdata(ctx->control, NULL);
1021 usb_driver_release_interface(driver, ctx->control);
1022 ctx->control = NULL;
1023 }
1024
1025 usb_set_intfdata(intf, NULL);
1026 cdc_ncm_free(ctx);
1027 }
1028 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
1029
1030 /* Return the number of the MBIM control interface altsetting iff it
1031 * is preferred and available,
1032 */
1033 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1034 {
1035 struct usb_host_interface *alt;
1036
1037 /* The MBIM spec defines a NCM compatible default altsetting,
1038 * which we may have matched:
1039 *
1040 * "Functions that implement both NCM 1.0 and MBIM (an
1041 * “NCM/MBIM function”) according to this recommendation
1042 * shall provide two alternate settings for the
1043 * Communication Interface. Alternate setting 0, and the
1044 * associated class and endpoint descriptors, shall be
1045 * constructed according to the rules given for the
1046 * Communication Interface in section 5 of [USBNCM10].
1047 * Alternate setting 1, and the associated class and
1048 * endpoint descriptors, shall be constructed according to
1049 * the rules given in section 6 (USB Device Model) of this
1050 * specification."
1051 */
1052 if (intf->num_altsetting < 2)
1053 return intf->cur_altsetting->desc.bAlternateSetting;
1054
1055 if (prefer_mbim) {
1056 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1057 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1058 return CDC_NCM_COMM_ALTSETTING_MBIM;
1059 }
1060 return CDC_NCM_COMM_ALTSETTING_NCM;
1061 }
1062 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1063
1064 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1065 {
1066 /* MBIM backwards compatible function? */
1067 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1068 return -ENODEV;
1069
1070 /* The NCM data altsetting is fixed, so we hard-coded it.
1071 * Additionally, generic NCM devices are assumed to accept arbitrarily
1072 * placed NDP.
1073 */
1074 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1075 }
1076
1077 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1078 {
1079 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1080
1081 if (skb->len + align > max)
1082 align = max - skb->len;
1083 if (align && skb_tailroom(skb) >= align)
1084 skb_put_zero(skb, align);
1085 }
1086
1087 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1088 * allocating a new one within skb
1089 */
1090 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1091 {
1092 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1093 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1094 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1095
1096 /* If NDP should be moved to the end of the NCM package, we can't follow the
1097 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1098 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1099 */
1100 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1101 if (ctx->delayed_ndp16->dwSignature == sign)
1102 return ctx->delayed_ndp16;
1103
1104 /* We can only push a single NDP to the end. Return
1105 * NULL to send what we've already got and queue this
1106 * skb for later.
1107 */
1108 else if (ctx->delayed_ndp16->dwSignature)
1109 return NULL;
1110 }
1111
1112 /* follow the chain of NDPs, looking for a match */
1113 while (ndpoffset) {
1114 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1115 if (ndp16->dwSignature == sign)
1116 return ndp16;
1117 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1118 }
1119
1120 /* align new NDP */
1121 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1122 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1123
1124 /* verify that there is room for the NDP and the datagram (reserve) */
1125 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1126 return NULL;
1127
1128 /* link to it */
1129 if (ndp16)
1130 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1131 else
1132 nth16->wNdpIndex = cpu_to_le16(skb->len);
1133
1134 /* push a new empty NDP */
1135 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1136 ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1137 else
1138 ndp16 = ctx->delayed_ndp16;
1139
1140 ndp16->dwSignature = sign;
1141 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1142 return ndp16;
1143 }
1144
1145 static struct usb_cdc_ncm_ndp32 *cdc_ncm_ndp32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1146 {
1147 struct usb_cdc_ncm_ndp32 *ndp32 = NULL;
1148 struct usb_cdc_ncm_nth32 *nth32 = (void *)skb->data;
1149 size_t ndpoffset = le32_to_cpu(nth32->dwNdpIndex);
1150
1151 /* If NDP should be moved to the end of the NCM package, we can't follow the
1152 * NTH32 header as we would normally do. NDP isn't written to the SKB yet, and
1153 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1154 */
1155 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1156 if (ctx->delayed_ndp32->dwSignature == sign)
1157 return ctx->delayed_ndp32;
1158
1159 /* We can only push a single NDP to the end. Return
1160 * NULL to send what we've already got and queue this
1161 * skb for later.
1162 */
1163 else if (ctx->delayed_ndp32->dwSignature)
1164 return NULL;
1165 }
1166
1167 /* follow the chain of NDPs, looking for a match */
1168 while (ndpoffset) {
1169 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb->data + ndpoffset);
1170 if (ndp32->dwSignature == sign)
1171 return ndp32;
1172 ndpoffset = le32_to_cpu(ndp32->dwNextNdpIndex);
1173 }
1174
1175 /* align new NDP */
1176 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1177 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1178
1179 /* verify that there is room for the NDP and the datagram (reserve) */
1180 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1181 return NULL;
1182
1183 /* link to it */
1184 if (ndp32)
1185 ndp32->dwNextNdpIndex = cpu_to_le32(skb->len);
1186 else
1187 nth32->dwNdpIndex = cpu_to_le32(skb->len);
1188
1189 /* push a new empty NDP */
1190 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1191 ndp32 = skb_put_zero(skb, ctx->max_ndp_size);
1192 else
1193 ndp32 = ctx->delayed_ndp32;
1194
1195 ndp32->dwSignature = sign;
1196 ndp32->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32));
1197 return ndp32;
1198 }
1199
1200 struct sk_buff *
1201 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1202 {
1203 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1204 union {
1205 struct usb_cdc_ncm_nth16 *nth16;
1206 struct usb_cdc_ncm_nth32 *nth32;
1207 } nth;
1208 union {
1209 struct usb_cdc_ncm_ndp16 *ndp16;
1210 struct usb_cdc_ncm_ndp32 *ndp32;
1211 } ndp;
1212 struct sk_buff *skb_out;
1213 u16 n = 0, index, ndplen;
1214 u8 ready2send = 0;
1215 u32 delayed_ndp_size;
1216 size_t padding_count;
1217
1218 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1219 * accordingly. Otherwise, we should check here.
1220 */
1221 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1222 delayed_ndp_size = ctx->max_ndp_size +
1223 max_t(u32,
1224 ctx->tx_ndp_modulus,
1225 ctx->tx_modulus + ctx->tx_remainder) - 1;
1226 else
1227 delayed_ndp_size = 0;
1228
1229 /* if there is a remaining skb, it gets priority */
1230 if (skb != NULL) {
1231 swap(skb, ctx->tx_rem_skb);
1232 swap(sign, ctx->tx_rem_sign);
1233 } else {
1234 ready2send = 1;
1235 }
1236
1237 /* check if we are resuming an OUT skb */
1238 skb_out = ctx->tx_curr_skb;
1239
1240 /* allocate a new OUT skb */
1241 if (!skb_out) {
1242 if (ctx->tx_low_mem_val == 0) {
1243 ctx->tx_curr_size = ctx->tx_max;
1244 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1245 /* If the memory allocation fails we will wait longer
1246 * each time before attempting another full size
1247 * allocation again to not overload the system
1248 * further.
1249 */
1250 if (skb_out == NULL) {
1251 /* If even the smallest allocation fails, abort. */
1252 if (ctx->tx_curr_size == USB_CDC_NCM_NTB_MIN_OUT_SIZE)
1253 goto alloc_failed;
1254 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1255 (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1256 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1257 }
1258 }
1259 if (skb_out == NULL) {
1260 /* See if a very small allocation is possible.
1261 * We will send this packet immediately and hope
1262 * that there is more memory available later.
1263 */
1264 if (skb)
1265 ctx->tx_curr_size = max(skb->len,
1266 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1267 else
1268 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1269 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1270
1271 /* No allocation possible so we will abort */
1272 if (!skb_out)
1273 goto alloc_failed;
1274 ctx->tx_low_mem_val--;
1275 }
1276 if (ctx->is_ndp16) {
1277 /* fill out the initial 16-bit NTB header */
1278 nth.nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1279 nth.nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1280 nth.nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1281 nth.nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1282 } else {
1283 /* fill out the initial 32-bit NTB header */
1284 nth.nth32 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth32));
1285 nth.nth32->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH32_SIGN);
1286 nth.nth32->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth32));
1287 nth.nth32->wSequence = cpu_to_le16(ctx->tx_seq++);
1288 }
1289
1290 /* count total number of frames in this NTB */
1291 ctx->tx_curr_frame_num = 0;
1292
1293 /* recent payload counter for this skb_out */
1294 ctx->tx_curr_frame_payload = 0;
1295 }
1296
1297 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1298 /* send any remaining skb first */
1299 if (skb == NULL) {
1300 skb = ctx->tx_rem_skb;
1301 sign = ctx->tx_rem_sign;
1302 ctx->tx_rem_skb = NULL;
1303
1304 /* check for end of skb */
1305 if (skb == NULL)
1306 break;
1307 }
1308
1309 /* get the appropriate NDP for this skb */
1310 if (ctx->is_ndp16)
1311 ndp.ndp16 = cdc_ncm_ndp16(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1312 else
1313 ndp.ndp32 = cdc_ncm_ndp32(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1314
1315 /* align beginning of next frame */
1316 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1317
1318 /* check if we had enough room left for both NDP and frame */
1319 if ((ctx->is_ndp16 && !ndp.ndp16) || (!ctx->is_ndp16 && !ndp.ndp32) ||
1320 skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1321 if (n == 0) {
1322 /* won't fit, MTU problem? */
1323 dev_kfree_skb_any(skb);
1324 skb = NULL;
1325 dev->net->stats.tx_dropped++;
1326 } else {
1327 /* no room for skb - store for later */
1328 if (ctx->tx_rem_skb != NULL) {
1329 dev_kfree_skb_any(ctx->tx_rem_skb);
1330 dev->net->stats.tx_dropped++;
1331 }
1332 ctx->tx_rem_skb = skb;
1333 ctx->tx_rem_sign = sign;
1334 skb = NULL;
1335 ready2send = 1;
1336 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1337 }
1338 break;
1339 }
1340
1341 /* calculate frame number within this NDP */
1342 if (ctx->is_ndp16) {
1343 ndplen = le16_to_cpu(ndp.ndp16->wLength);
1344 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1345
1346 /* OK, add this skb */
1347 ndp.ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1348 ndp.ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1349 ndp.ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1350 } else {
1351 ndplen = le16_to_cpu(ndp.ndp32->wLength);
1352 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp32)) / sizeof(struct usb_cdc_ncm_dpe32) - 1;
1353
1354 ndp.ndp32->dpe32[index].dwDatagramLength = cpu_to_le32(skb->len);
1355 ndp.ndp32->dpe32[index].dwDatagramIndex = cpu_to_le32(skb_out->len);
1356 ndp.ndp32->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe32));
1357 }
1358 skb_put_data(skb_out, skb->data, skb->len);
1359 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1360 dev_kfree_skb_any(skb);
1361 skb = NULL;
1362
1363 /* send now if this NDP is full */
1364 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1365 ready2send = 1;
1366 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1367 break;
1368 }
1369 }
1370
1371 /* free up any dangling skb */
1372 if (skb != NULL) {
1373 dev_kfree_skb_any(skb);
1374 skb = NULL;
1375 dev->net->stats.tx_dropped++;
1376 }
1377
1378 ctx->tx_curr_frame_num = n;
1379
1380 if (n == 0) {
1381 /* wait for more frames */
1382 /* push variables */
1383 ctx->tx_curr_skb = skb_out;
1384 goto exit_no_skb;
1385
1386 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1387 /* wait for more frames */
1388 /* push variables */
1389 ctx->tx_curr_skb = skb_out;
1390 /* set the pending count */
1391 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1392 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1393 goto exit_no_skb;
1394
1395 } else {
1396 if (n == ctx->tx_max_datagrams)
1397 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1398 /* frame goes out */
1399 /* variables will be reset at next call */
1400 }
1401
1402 /* If requested, put NDP at end of frame. */
1403 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1404 if (ctx->is_ndp16) {
1405 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1406 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1407 nth.nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1408 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1409
1410 /* Zero out delayed NDP - signature checking will naturally fail. */
1411 ndp.ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1412 } else {
1413 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1414 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1415 nth.nth32->dwNdpIndex = cpu_to_le32(skb_out->len);
1416 skb_put_data(skb_out, ctx->delayed_ndp32, ctx->max_ndp_size);
1417
1418 ndp.ndp32 = memset(ctx->delayed_ndp32, 0, ctx->max_ndp_size);
1419 }
1420 }
1421
1422 /* If collected data size is less or equal ctx->min_tx_pkt
1423 * bytes, we send buffers as it is. If we get more data, it
1424 * would be more efficient for USB HS mobile device with DMA
1425 * engine to receive a full size NTB, than canceling DMA
1426 * transfer and receiving a short packet.
1427 *
1428 * This optimization support is pointless if we end up sending
1429 * a ZLP after full sized NTBs.
1430 */
1431 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1432 skb_out->len > ctx->min_tx_pkt) {
1433 padding_count = ctx->tx_curr_size - skb_out->len;
1434 if (!WARN_ON(padding_count > ctx->tx_curr_size))
1435 skb_put_zero(skb_out, padding_count);
1436 } else if (skb_out->len < ctx->tx_curr_size &&
1437 (skb_out->len % dev->maxpacket) == 0) {
1438 skb_put_u8(skb_out, 0); /* force short packet */
1439 }
1440
1441 /* set final frame length */
1442 if (ctx->is_ndp16) {
1443 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1444 nth.nth16->wBlockLength = cpu_to_le16(skb_out->len);
1445 } else {
1446 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1447 nth.nth32->dwBlockLength = cpu_to_le32(skb_out->len);
1448 }
1449
1450 /* return skb */
1451 ctx->tx_curr_skb = NULL;
1452
1453 /* keep private stats: framing overhead and number of NTBs */
1454 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1455 ctx->tx_ntbs++;
1456
1457 /* usbnet will count all the framing overhead by default.
1458 * Adjust the stats so that the tx_bytes counter show real
1459 * payload data instead.
1460 */
1461 usbnet_set_skb_tx_stats(skb_out, n,
1462 (long)ctx->tx_curr_frame_payload - skb_out->len);
1463
1464 return skb_out;
1465
1466 alloc_failed:
1467 if (skb) {
1468 dev_kfree_skb_any(skb);
1469 dev->net->stats.tx_dropped++;
1470 }
1471 exit_no_skb:
1472 /* Start timer, if there is a remaining non-empty skb */
1473 if (ctx->tx_curr_skb != NULL && n > 0)
1474 cdc_ncm_tx_timeout_start(ctx);
1475 return NULL;
1476 }
1477 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1478
1479 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1480 {
1481 /* start timer, if not already started */
1482 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1483 hrtimer_start(&ctx->tx_timer,
1484 ctx->timer_interval,
1485 HRTIMER_MODE_REL);
1486 }
1487
1488 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1489 {
1490 struct cdc_ncm_ctx *ctx =
1491 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1492
1493 if (!atomic_read(&ctx->stop))
1494 tasklet_schedule(&ctx->bh);
1495 return HRTIMER_NORESTART;
1496 }
1497
1498 static void cdc_ncm_txpath_bh(struct tasklet_struct *t)
1499 {
1500 struct cdc_ncm_ctx *ctx = from_tasklet(ctx, t, bh);
1501 struct usbnet *dev = ctx->dev;
1502
1503 spin_lock(&ctx->mtx);
1504 if (ctx->tx_timer_pending != 0) {
1505 ctx->tx_timer_pending--;
1506 cdc_ncm_tx_timeout_start(ctx);
1507 spin_unlock(&ctx->mtx);
1508 } else if (dev->net != NULL) {
1509 ctx->tx_reason_timeout++; /* count reason for transmitting */
1510 spin_unlock(&ctx->mtx);
1511 netif_tx_lock_bh(dev->net);
1512 usbnet_start_xmit(NULL, dev->net);
1513 netif_tx_unlock_bh(dev->net);
1514 } else {
1515 spin_unlock(&ctx->mtx);
1516 }
1517 }
1518
1519 struct sk_buff *
1520 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1521 {
1522 struct sk_buff *skb_out;
1523 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1524
1525 /*
1526 * The Ethernet API we are using does not support transmitting
1527 * multiple Ethernet frames in a single call. This driver will
1528 * accumulate multiple Ethernet frames and send out a larger
1529 * USB frame when the USB buffer is full or when a single jiffies
1530 * timeout happens.
1531 */
1532 if (ctx == NULL)
1533 goto error;
1534
1535 spin_lock_bh(&ctx->mtx);
1536
1537 if (ctx->is_ndp16)
1538 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1539 else
1540 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN));
1541
1542 spin_unlock_bh(&ctx->mtx);
1543 return skb_out;
1544
1545 error:
1546 if (skb != NULL)
1547 dev_kfree_skb_any(skb);
1548
1549 return NULL;
1550 }
1551 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1552
1553 /* verify NTB header and return offset of first NDP, or negative error */
1554 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1555 {
1556 struct usbnet *dev = netdev_priv(skb_in->dev);
1557 struct usb_cdc_ncm_nth16 *nth16;
1558 int len;
1559 int ret = -EINVAL;
1560
1561 if (ctx == NULL)
1562 goto error;
1563
1564 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1565 sizeof(struct usb_cdc_ncm_ndp16))) {
1566 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1567 goto error;
1568 }
1569
1570 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1571
1572 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1573 netif_dbg(dev, rx_err, dev->net,
1574 "invalid NTH16 signature <%#010x>\n",
1575 le32_to_cpu(nth16->dwSignature));
1576 goto error;
1577 }
1578
1579 len = le16_to_cpu(nth16->wBlockLength);
1580 if (len > ctx->rx_max) {
1581 netif_dbg(dev, rx_err, dev->net,
1582 "unsupported NTB block length %u/%u\n", len,
1583 ctx->rx_max);
1584 goto error;
1585 }
1586
1587 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1588 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1589 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1590 netif_dbg(dev, rx_err, dev->net,
1591 "sequence number glitch prev=%d curr=%d\n",
1592 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1593 }
1594 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1595
1596 ret = le16_to_cpu(nth16->wNdpIndex);
1597 error:
1598 return ret;
1599 }
1600 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1601
1602 int cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1603 {
1604 struct usbnet *dev = netdev_priv(skb_in->dev);
1605 struct usb_cdc_ncm_nth32 *nth32;
1606 int len;
1607 int ret = -EINVAL;
1608
1609 if (ctx == NULL)
1610 goto error;
1611
1612 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth32) +
1613 sizeof(struct usb_cdc_ncm_ndp32))) {
1614 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1615 goto error;
1616 }
1617
1618 nth32 = (struct usb_cdc_ncm_nth32 *)skb_in->data;
1619
1620 if (nth32->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH32_SIGN)) {
1621 netif_dbg(dev, rx_err, dev->net,
1622 "invalid NTH32 signature <%#010x>\n",
1623 le32_to_cpu(nth32->dwSignature));
1624 goto error;
1625 }
1626
1627 len = le32_to_cpu(nth32->dwBlockLength);
1628 if (len > ctx->rx_max) {
1629 netif_dbg(dev, rx_err, dev->net,
1630 "unsupported NTB block length %u/%u\n", len,
1631 ctx->rx_max);
1632 goto error;
1633 }
1634
1635 if ((ctx->rx_seq + 1) != le16_to_cpu(nth32->wSequence) &&
1636 (ctx->rx_seq || le16_to_cpu(nth32->wSequence)) &&
1637 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth32->wSequence))) {
1638 netif_dbg(dev, rx_err, dev->net,
1639 "sequence number glitch prev=%d curr=%d\n",
1640 ctx->rx_seq, le16_to_cpu(nth32->wSequence));
1641 }
1642 ctx->rx_seq = le16_to_cpu(nth32->wSequence);
1643
1644 ret = le32_to_cpu(nth32->dwNdpIndex);
1645 error:
1646 return ret;
1647 }
1648 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth32);
1649
1650 /* verify NDP header and return number of datagrams, or negative error */
1651 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1652 {
1653 struct usbnet *dev = netdev_priv(skb_in->dev);
1654 struct usb_cdc_ncm_ndp16 *ndp16;
1655 int ret = -EINVAL;
1656
1657 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1658 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1659 ndpoffset);
1660 goto error;
1661 }
1662 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1663
1664 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1665 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1666 le16_to_cpu(ndp16->wLength));
1667 goto error;
1668 }
1669
1670 ret = ((le16_to_cpu(ndp16->wLength) -
1671 sizeof(struct usb_cdc_ncm_ndp16)) /
1672 sizeof(struct usb_cdc_ncm_dpe16));
1673 ret--; /* we process NDP entries except for the last one */
1674
1675 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1676 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1677 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1678 ret = -EINVAL;
1679 }
1680
1681 error:
1682 return ret;
1683 }
1684 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1685
1686 /* verify NDP header and return number of datagrams, or negative error */
1687 int cdc_ncm_rx_verify_ndp32(struct sk_buff *skb_in, int ndpoffset)
1688 {
1689 struct usbnet *dev = netdev_priv(skb_in->dev);
1690 struct usb_cdc_ncm_ndp32 *ndp32;
1691 int ret = -EINVAL;
1692
1693 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp32)) > skb_in->len) {
1694 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1695 ndpoffset);
1696 goto error;
1697 }
1698 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1699
1700 if (le16_to_cpu(ndp32->wLength) < USB_CDC_NCM_NDP32_LENGTH_MIN) {
1701 netif_dbg(dev, rx_err, dev->net, "invalid DPT32 length <%u>\n",
1702 le16_to_cpu(ndp32->wLength));
1703 goto error;
1704 }
1705
1706 ret = ((le16_to_cpu(ndp32->wLength) -
1707 sizeof(struct usb_cdc_ncm_ndp32)) /
1708 sizeof(struct usb_cdc_ncm_dpe32));
1709 ret--; /* we process NDP entries except for the last one */
1710
1711 if ((sizeof(struct usb_cdc_ncm_ndp32) +
1712 ret * (sizeof(struct usb_cdc_ncm_dpe32))) > skb_in->len) {
1713 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1714 ret = -EINVAL;
1715 }
1716
1717 error:
1718 return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp32);
1721
1722 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1723 {
1724 struct sk_buff *skb;
1725 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1726 unsigned int len;
1727 int nframes;
1728 int x;
1729 unsigned int offset;
1730 union {
1731 struct usb_cdc_ncm_ndp16 *ndp16;
1732 struct usb_cdc_ncm_ndp32 *ndp32;
1733 } ndp;
1734 union {
1735 struct usb_cdc_ncm_dpe16 *dpe16;
1736 struct usb_cdc_ncm_dpe32 *dpe32;
1737 } dpe;
1738
1739 int ndpoffset;
1740 int loopcount = 50; /* arbitrary max preventing infinite loop */
1741 u32 payload = 0;
1742
1743 if (ctx->is_ndp16)
1744 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1745 else
1746 ndpoffset = cdc_ncm_rx_verify_nth32(ctx, skb_in);
1747
1748 if (ndpoffset < 0)
1749 goto error;
1750
1751 next_ndp:
1752 if (ctx->is_ndp16) {
1753 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1754 if (nframes < 0)
1755 goto error;
1756
1757 ndp.ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1758
1759 if (ndp.ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1760 netif_dbg(dev, rx_err, dev->net,
1761 "invalid DPT16 signature <%#010x>\n",
1762 le32_to_cpu(ndp.ndp16->dwSignature));
1763 goto err_ndp;
1764 }
1765 dpe.dpe16 = ndp.ndp16->dpe16;
1766 } else {
1767 nframes = cdc_ncm_rx_verify_ndp32(skb_in, ndpoffset);
1768 if (nframes < 0)
1769 goto error;
1770
1771 ndp.ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1772
1773 if (ndp.ndp32->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN)) {
1774 netif_dbg(dev, rx_err, dev->net,
1775 "invalid DPT32 signature <%#010x>\n",
1776 le32_to_cpu(ndp.ndp32->dwSignature));
1777 goto err_ndp;
1778 }
1779 dpe.dpe32 = ndp.ndp32->dpe32;
1780 }
1781
1782 for (x = 0; x < nframes; x++) {
1783 if (ctx->is_ndp16) {
1784 offset = le16_to_cpu(dpe.dpe16->wDatagramIndex);
1785 len = le16_to_cpu(dpe.dpe16->wDatagramLength);
1786 } else {
1787 offset = le32_to_cpu(dpe.dpe32->dwDatagramIndex);
1788 len = le32_to_cpu(dpe.dpe32->dwDatagramLength);
1789 }
1790
1791 /*
1792 * CDC NCM ch. 3.7
1793 * All entries after first NULL entry are to be ignored
1794 */
1795 if ((offset == 0) || (len == 0)) {
1796 if (!x)
1797 goto err_ndp; /* empty NTB */
1798 break;
1799 }
1800
1801 /* sanity checking - watch out for integer wrap*/
1802 if ((offset > skb_in->len) || (len > skb_in->len - offset) ||
1803 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1804 netif_dbg(dev, rx_err, dev->net,
1805 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1806 x, offset, len, skb_in);
1807 if (!x)
1808 goto err_ndp;
1809 break;
1810
1811 } else {
1812 /* create a fresh copy to reduce truesize */
1813 skb = netdev_alloc_skb_ip_align(dev->net, len);
1814 if (!skb)
1815 goto error;
1816 skb_put_data(skb, skb_in->data + offset, len);
1817 usbnet_skb_return(dev, skb);
1818 payload += len; /* count payload bytes in this NTB */
1819 }
1820
1821 if (ctx->is_ndp16)
1822 dpe.dpe16++;
1823 else
1824 dpe.dpe32++;
1825 }
1826 err_ndp:
1827 /* are there more NDPs to process? */
1828 if (ctx->is_ndp16)
1829 ndpoffset = le16_to_cpu(ndp.ndp16->wNextNdpIndex);
1830 else
1831 ndpoffset = le32_to_cpu(ndp.ndp32->dwNextNdpIndex);
1832
1833 if (ndpoffset && loopcount--)
1834 goto next_ndp;
1835
1836 /* update stats */
1837 ctx->rx_overhead += skb_in->len - payload;
1838 ctx->rx_ntbs++;
1839
1840 return 1;
1841 error:
1842 return 0;
1843 }
1844 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1845
1846 static void
1847 cdc_ncm_speed_change(struct usbnet *dev,
1848 struct usb_cdc_speed_change *data)
1849 {
1850 /* RTL8156 shipped before 2021 sends notification about every 32ms. */
1851 dev->rx_speed = le32_to_cpu(data->DLBitRRate);
1852 dev->tx_speed = le32_to_cpu(data->ULBitRate);
1853 }
1854
1855 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1856 {
1857 struct usb_cdc_notification *event;
1858
1859 if (urb->actual_length < sizeof(*event))
1860 return;
1861
1862 /* test for split data in 8-byte chunks */
1863 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1864 cdc_ncm_speed_change(dev,
1865 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1866 return;
1867 }
1868
1869 event = urb->transfer_buffer;
1870
1871 switch (event->bNotificationType) {
1872 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1873 /*
1874 * According to the CDC NCM specification ch.7.1
1875 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1876 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1877 */
1878 /* RTL8156 shipped before 2021 sends notification about
1879 * every 32ms. Don't forward notification if state is same.
1880 */
1881 if (netif_carrier_ok(dev->net) != !!event->wValue)
1882 usbnet_link_change(dev, !!event->wValue, 0);
1883 break;
1884
1885 case USB_CDC_NOTIFY_SPEED_CHANGE:
1886 if (urb->actual_length < (sizeof(*event) +
1887 sizeof(struct usb_cdc_speed_change)))
1888 set_bit(EVENT_STS_SPLIT, &dev->flags);
1889 else
1890 cdc_ncm_speed_change(dev,
1891 (struct usb_cdc_speed_change *)&event[1]);
1892 break;
1893
1894 default:
1895 dev_dbg(&dev->udev->dev,
1896 "NCM: unexpected notification 0x%02x!\n",
1897 event->bNotificationType);
1898 break;
1899 }
1900 }
1901
1902 static const struct driver_info cdc_ncm_info = {
1903 .description = "CDC NCM (NO ZLP)",
1904 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1905 | FLAG_LINK_INTR | FLAG_ETHER,
1906 .bind = cdc_ncm_bind,
1907 .unbind = cdc_ncm_unbind,
1908 .manage_power = usbnet_manage_power,
1909 .status = cdc_ncm_status,
1910 .rx_fixup = cdc_ncm_rx_fixup,
1911 .tx_fixup = cdc_ncm_tx_fixup,
1912 .set_rx_mode = usbnet_cdc_update_filter,
1913 };
1914
1915 /* Same as cdc_ncm_info, but with FLAG_SEND_ZLP */
1916 static const struct driver_info cdc_ncm_zlp_info = {
1917 .description = "CDC NCM (SEND ZLP)",
1918 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1919 | FLAG_LINK_INTR | FLAG_ETHER | FLAG_SEND_ZLP,
1920 .bind = cdc_ncm_bind,
1921 .unbind = cdc_ncm_unbind,
1922 .manage_power = usbnet_manage_power,
1923 .status = cdc_ncm_status,
1924 .rx_fixup = cdc_ncm_rx_fixup,
1925 .tx_fixup = cdc_ncm_tx_fixup,
1926 .set_rx_mode = usbnet_cdc_update_filter,
1927 };
1928
1929 /* Same as cdc_ncm_info, but with FLAG_SEND_ZLP */
1930 static const struct driver_info apple_tethering_interface_info = {
1931 .description = "CDC NCM (Apple Tethering)",
1932 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1933 | FLAG_LINK_INTR | FLAG_ETHER | FLAG_SEND_ZLP,
1934 .bind = cdc_ncm_bind,
1935 .unbind = cdc_ncm_unbind,
1936 .manage_power = usbnet_manage_power,
1937 .status = cdc_ncm_status,
1938 .rx_fixup = cdc_ncm_rx_fixup,
1939 .tx_fixup = cdc_ncm_tx_fixup,
1940 .set_rx_mode = usbnet_cdc_update_filter,
1941 };
1942
1943 /* Same as apple_tethering_interface_info, but without FLAG_LINK_INTR */
1944 static const struct driver_info apple_private_interface_info = {
1945 .description = "CDC NCM (Apple Private)",
1946 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1947 | FLAG_ETHER | FLAG_SEND_ZLP,
1948 .bind = cdc_ncm_bind,
1949 .unbind = cdc_ncm_unbind,
1950 .manage_power = usbnet_manage_power,
1951 .status = cdc_ncm_status,
1952 .rx_fixup = cdc_ncm_rx_fixup,
1953 .tx_fixup = cdc_ncm_tx_fixup,
1954 .set_rx_mode = usbnet_cdc_update_filter,
1955 };
1956
1957 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1958 static const struct driver_info wwan_info = {
1959 .description = "Mobile Broadband Network Device",
1960 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1961 | FLAG_LINK_INTR | FLAG_WWAN,
1962 .bind = cdc_ncm_bind,
1963 .unbind = cdc_ncm_unbind,
1964 .manage_power = usbnet_manage_power,
1965 .status = cdc_ncm_status,
1966 .rx_fixup = cdc_ncm_rx_fixup,
1967 .tx_fixup = cdc_ncm_tx_fixup,
1968 .set_rx_mode = usbnet_cdc_update_filter,
1969 };
1970
1971 /* Same as wwan_info, but with FLAG_NOARP */
1972 static const struct driver_info wwan_noarp_info = {
1973 .description = "Mobile Broadband Network Device (NO ARP)",
1974 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1975 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1976 .bind = cdc_ncm_bind,
1977 .unbind = cdc_ncm_unbind,
1978 .manage_power = usbnet_manage_power,
1979 .status = cdc_ncm_status,
1980 .rx_fixup = cdc_ncm_rx_fixup,
1981 .tx_fixup = cdc_ncm_tx_fixup,
1982 .set_rx_mode = usbnet_cdc_update_filter,
1983 };
1984
1985 static const struct usb_device_id cdc_devs[] = {
1986 /* iPhone */
1987 { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x12a8, 2),
1988 .driver_info = (unsigned long)&apple_tethering_interface_info,
1989 },
1990 { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x12a8, 4),
1991 .driver_info = (unsigned long)&apple_private_interface_info,
1992 },
1993
1994 /* iPad */
1995 { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x12ab, 2),
1996 .driver_info = (unsigned long)&apple_tethering_interface_info,
1997 },
1998 { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x12ab, 4),
1999 .driver_info = (unsigned long)&apple_private_interface_info,
2000 },
2001
2002 /* Ericsson MBM devices like F5521gw */
2003 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
2004 | USB_DEVICE_ID_MATCH_VENDOR,
2005 .idVendor = 0x0bdb,
2006 .bInterfaceClass = USB_CLASS_COMM,
2007 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2008 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2009 .driver_info = (unsigned long) &wwan_info,
2010 },
2011
2012 /* Telit LE910 V2 */
2013 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
2014 USB_CLASS_COMM,
2015 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2016 .driver_info = (unsigned long)&wwan_noarp_info,
2017 },
2018
2019 /* DW5812 LTE Verizon Mobile Broadband Card
2020 * Unlike DW5550 this device requires FLAG_NOARP
2021 */
2022 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
2023 USB_CLASS_COMM,
2024 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2025 .driver_info = (unsigned long)&wwan_noarp_info,
2026 },
2027
2028 /* DW5813 LTE AT&T Mobile Broadband Card
2029 * Unlike DW5550 this device requires FLAG_NOARP
2030 */
2031 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
2032 USB_CLASS_COMM,
2033 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2034 .driver_info = (unsigned long)&wwan_noarp_info,
2035 },
2036
2037 /* Dell branded MBM devices like DW5550 */
2038 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
2039 | USB_DEVICE_ID_MATCH_VENDOR,
2040 .idVendor = 0x413c,
2041 .bInterfaceClass = USB_CLASS_COMM,
2042 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2043 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2044 .driver_info = (unsigned long) &wwan_info,
2045 },
2046
2047 /* Toshiba branded MBM devices */
2048 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
2049 | USB_DEVICE_ID_MATCH_VENDOR,
2050 .idVendor = 0x0930,
2051 .bInterfaceClass = USB_CLASS_COMM,
2052 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2053 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2054 .driver_info = (unsigned long) &wwan_info,
2055 },
2056
2057 /* tag Huawei devices as wwan */
2058 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
2059 USB_CLASS_COMM,
2060 USB_CDC_SUBCLASS_NCM,
2061 USB_CDC_PROTO_NONE),
2062 .driver_info = (unsigned long)&wwan_info,
2063 },
2064
2065 /* Infineon(now Intel) HSPA Modem platform */
2066 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
2067 USB_CLASS_COMM,
2068 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2069 .driver_info = (unsigned long)&wwan_noarp_info,
2070 },
2071
2072 /* u-blox TOBY-L4 */
2073 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
2074 USB_CLASS_COMM,
2075 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2076 .driver_info = (unsigned long)&wwan_info,
2077 },
2078
2079 /* DisplayLink docking stations */
2080 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
2081 | USB_DEVICE_ID_MATCH_VENDOR,
2082 .idVendor = 0x17e9,
2083 .bInterfaceClass = USB_CLASS_COMM,
2084 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2085 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2086 .driver_info = (unsigned long)&cdc_ncm_zlp_info,
2087 },
2088
2089 /* Generic CDC-NCM devices */
2090 { USB_INTERFACE_INFO(USB_CLASS_COMM,
2091 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2092 .driver_info = (unsigned long)&cdc_ncm_info,
2093 },
2094 {
2095 },
2096 };
2097 MODULE_DEVICE_TABLE(usb, cdc_devs);
2098
2099 static struct usb_driver cdc_ncm_driver = {
2100 .name = "cdc_ncm",
2101 .id_table = cdc_devs,
2102 .probe = usbnet_probe,
2103 .disconnect = usbnet_disconnect,
2104 .suspend = usbnet_suspend,
2105 .resume = usbnet_resume,
2106 .reset_resume = usbnet_resume,
2107 .supports_autosuspend = 1,
2108 .disable_hub_initiated_lpm = 1,
2109 };
2110
2111 module_usb_driver(cdc_ncm_driver);
2112
2113 MODULE_AUTHOR("Hans Petter Selasky");
2114 MODULE_DESCRIPTION("USB CDC NCM host driver");
2115 MODULE_LICENSE("Dual BSD/GPL");
Kernel DRM miscellaneous fixes and cross-tree changes