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[deliverable/linux.git] / drivers / net / usb / cdc_ncm.c
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/workqueue.h>
47 #include <linux/mii.h>
48 #include <linux/crc32.h>
49 #include <linux/usb.h>
50 #include <linux/hrtimer.h>
51 #include <linux/atomic.h>
52 #include <linux/usb/usbnet.h>
53 #include <linux/usb/cdc.h>
54 #include <linux/usb/cdc_ncm.h>
55
56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
57 static bool prefer_mbim = true;
58 #else
59 static bool prefer_mbim;
60 #endif
61 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
63
64 static void cdc_ncm_txpath_bh(unsigned long param);
65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
67 static struct usb_driver cdc_ncm_driver;
68
69 struct cdc_ncm_stats {
70 char stat_string[ETH_GSTRING_LEN];
71 int sizeof_stat;
72 int stat_offset;
73 };
74
75 #define CDC_NCM_STAT(str, m) { \
76 .stat_string = str, \
77 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
78 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
79 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m)
80
81 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
82 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
83 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
84 CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
85 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
86 CDC_NCM_SIMPLE_STAT(tx_overhead),
87 CDC_NCM_SIMPLE_STAT(tx_ntbs),
88 CDC_NCM_SIMPLE_STAT(rx_overhead),
89 CDC_NCM_SIMPLE_STAT(rx_ntbs),
90 };
91
92 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
93 {
94 switch (sset) {
95 case ETH_SS_STATS:
96 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
97 default:
98 return -EOPNOTSUPP;
99 }
100 }
101
102 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
103 struct ethtool_stats __always_unused *stats,
104 u64 *data)
105 {
106 struct usbnet *dev = netdev_priv(netdev);
107 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
108 int i;
109 char *p = NULL;
110
111 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
112 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
113 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
114 }
115 }
116
117 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
118 {
119 u8 *p = data;
120 int i;
121
122 switch (stringset) {
123 case ETH_SS_STATS:
124 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
125 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
126 p += ETH_GSTRING_LEN;
127 }
128 }
129 }
130
131 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
132
133 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
134 .get_settings = usbnet_get_settings,
135 .set_settings = usbnet_set_settings,
136 .get_link = usbnet_get_link,
137 .nway_reset = usbnet_nway_reset,
138 .get_drvinfo = usbnet_get_drvinfo,
139 .get_msglevel = usbnet_get_msglevel,
140 .set_msglevel = usbnet_set_msglevel,
141 .get_ts_info = ethtool_op_get_ts_info,
142 .get_sset_count = cdc_ncm_get_sset_count,
143 .get_strings = cdc_ncm_get_strings,
144 .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
145 };
146
147 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
148 {
149 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
150 u32 val, max, min;
151
152 /* clamp new_rx to sane values */
153 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
154 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
155
156 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
157 if (max < min) {
158 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
159 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
160 max = min;
161 }
162
163 val = clamp_t(u32, new_rx, min, max);
164 if (val != new_rx)
165 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
166
167 return val;
168 }
169
170 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
171 {
172 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
173 u32 val, max, min;
174
175 /* clamp new_tx to sane values */
176 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
177 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
178
179 /* some devices set dwNtbOutMaxSize too low for the above default */
180 min = min(min, max);
181
182 val = clamp_t(u32, new_tx, min, max);
183 if (val != new_tx)
184 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
185
186 return val;
187 }
188
189 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
190 {
191 struct usbnet *dev = netdev_priv(to_net_dev(d));
192 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
193
194 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
195 }
196
197 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
198 {
199 struct usbnet *dev = netdev_priv(to_net_dev(d));
200 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
201
202 return sprintf(buf, "%u\n", ctx->rx_max);
203 }
204
205 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
206 {
207 struct usbnet *dev = netdev_priv(to_net_dev(d));
208 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
209
210 return sprintf(buf, "%u\n", ctx->tx_max);
211 }
212
213 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
214 {
215 struct usbnet *dev = netdev_priv(to_net_dev(d));
216 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
217
218 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
219 }
220
221 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
222 {
223 struct usbnet *dev = netdev_priv(to_net_dev(d));
224 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
225 unsigned long val;
226
227 /* no need to restrict values - anything from 0 to infinity is OK */
228 if (kstrtoul(buf, 0, &val))
229 return -EINVAL;
230
231 ctx->min_tx_pkt = val;
232 return len;
233 }
234
235 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
236 {
237 struct usbnet *dev = netdev_priv(to_net_dev(d));
238 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
239 unsigned long val;
240
241 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
242 return -EINVAL;
243
244 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
245 return len;
246 }
247
248 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
249 {
250 struct usbnet *dev = netdev_priv(to_net_dev(d));
251 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
252 unsigned long val;
253
254 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
255 return -EINVAL;
256
257 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
258 return len;
259 }
260
261 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
262 {
263 struct usbnet *dev = netdev_priv(to_net_dev(d));
264 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
265 ssize_t ret;
266 unsigned long val;
267
268 ret = kstrtoul(buf, 0, &val);
269 if (ret)
270 return ret;
271 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
272 return -EINVAL;
273
274 spin_lock_bh(&ctx->mtx);
275 ctx->timer_interval = val * NSEC_PER_USEC;
276 if (!ctx->timer_interval)
277 ctx->tx_timer_pending = 0;
278 spin_unlock_bh(&ctx->mtx);
279 return len;
280 }
281
282 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
283 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
284 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
285 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
286
287 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
288 {
289 struct usbnet *dev = netdev_priv(to_net_dev(d));
290 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
291
292 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
293 }
294
295 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
296 {
297 struct usbnet *dev = netdev_priv(to_net_dev(d));
298 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
299 bool enable;
300
301 if (strtobool(buf, &enable))
302 return -EINVAL;
303
304 /* no change? */
305 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
306 return len;
307
308 if (enable && !ctx->delayed_ndp16) {
309 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
310 if (!ctx->delayed_ndp16)
311 return -ENOMEM;
312 }
313
314 /* flush pending data before changing flag */
315 netif_tx_lock_bh(dev->net);
316 usbnet_start_xmit(NULL, dev->net);
317 spin_lock_bh(&ctx->mtx);
318 if (enable)
319 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
320 else
321 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
322 spin_unlock_bh(&ctx->mtx);
323 netif_tx_unlock_bh(dev->net);
324
325 return len;
326 }
327 static DEVICE_ATTR_RW(ndp_to_end);
328
329 #define NCM_PARM_ATTR(name, format, tocpu) \
330 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
331 { \
332 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
333 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
334 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
335 } \
336 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
337
338 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
339 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
340 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
341 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
342 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
343 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
344 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
345 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
346 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
347 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
348
349 static struct attribute *cdc_ncm_sysfs_attrs[] = {
350 &dev_attr_min_tx_pkt.attr,
351 &dev_attr_ndp_to_end.attr,
352 &dev_attr_rx_max.attr,
353 &dev_attr_tx_max.attr,
354 &dev_attr_tx_timer_usecs.attr,
355 &dev_attr_bmNtbFormatsSupported.attr,
356 &dev_attr_dwNtbInMaxSize.attr,
357 &dev_attr_wNdpInDivisor.attr,
358 &dev_attr_wNdpInPayloadRemainder.attr,
359 &dev_attr_wNdpInAlignment.attr,
360 &dev_attr_dwNtbOutMaxSize.attr,
361 &dev_attr_wNdpOutDivisor.attr,
362 &dev_attr_wNdpOutPayloadRemainder.attr,
363 &dev_attr_wNdpOutAlignment.attr,
364 &dev_attr_wNtbOutMaxDatagrams.attr,
365 NULL,
366 };
367
368 static struct attribute_group cdc_ncm_sysfs_attr_group = {
369 .name = "cdc_ncm",
370 .attrs = cdc_ncm_sysfs_attrs,
371 };
372
373 /* handle rx_max and tx_max changes */
374 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
375 {
376 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
377 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
378 u32 val;
379
380 val = cdc_ncm_check_rx_max(dev, new_rx);
381
382 /* inform device about NTB input size changes */
383 if (val != ctx->rx_max) {
384 __le32 dwNtbInMaxSize = cpu_to_le32(val);
385
386 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
387
388 /* tell device to use new size */
389 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
390 USB_TYPE_CLASS | USB_DIR_OUT
391 | USB_RECIP_INTERFACE,
392 0, iface_no, &dwNtbInMaxSize, 4) < 0)
393 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
394 else
395 ctx->rx_max = val;
396 }
397
398 /* usbnet use these values for sizing rx queues */
399 if (dev->rx_urb_size != ctx->rx_max) {
400 dev->rx_urb_size = ctx->rx_max;
401 if (netif_running(dev->net))
402 usbnet_unlink_rx_urbs(dev);
403 }
404
405 val = cdc_ncm_check_tx_max(dev, new_tx);
406 if (val != ctx->tx_max)
407 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
408
409 /* Adding a pad byte here if necessary simplifies the handling
410 * in cdc_ncm_fill_tx_frame, making tx_max always represent
411 * the real skb max size.
412 *
413 * We cannot use dev->maxpacket here because this is called from
414 * .bind which is called before usbnet sets up dev->maxpacket
415 */
416 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
417 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
418 val++;
419
420 /* we might need to flush any pending tx buffers if running */
421 if (netif_running(dev->net) && val > ctx->tx_max) {
422 netif_tx_lock_bh(dev->net);
423 usbnet_start_xmit(NULL, dev->net);
424 /* make sure tx_curr_skb is reallocated if it was empty */
425 if (ctx->tx_curr_skb) {
426 dev_kfree_skb_any(ctx->tx_curr_skb);
427 ctx->tx_curr_skb = NULL;
428 }
429 ctx->tx_max = val;
430 netif_tx_unlock_bh(dev->net);
431 } else {
432 ctx->tx_max = val;
433 }
434
435 dev->hard_mtu = ctx->tx_max;
436
437 /* max qlen depend on hard_mtu and rx_urb_size */
438 usbnet_update_max_qlen(dev);
439
440 /* never pad more than 3 full USB packets per transfer */
441 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
442 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
443 }
444
445 /* helpers for NCM and MBIM differences */
446 static u8 cdc_ncm_flags(struct usbnet *dev)
447 {
448 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
449
450 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
451 return ctx->mbim_desc->bmNetworkCapabilities;
452 if (ctx->func_desc)
453 return ctx->func_desc->bmNetworkCapabilities;
454 return 0;
455 }
456
457 static int cdc_ncm_eth_hlen(struct usbnet *dev)
458 {
459 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
460 return 0;
461 return ETH_HLEN;
462 }
463
464 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
465 {
466 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
467 return CDC_MBIM_MIN_DATAGRAM_SIZE;
468 return CDC_NCM_MIN_DATAGRAM_SIZE;
469 }
470
471 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
472 {
473 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
474
475 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
476 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
477 if (ctx->ether_desc)
478 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
479 return CDC_NCM_MAX_DATAGRAM_SIZE;
480 }
481
482 /* initial one-time device setup. MUST be called with the data interface
483 * in altsetting 0
484 */
485 static int cdc_ncm_init(struct usbnet *dev)
486 {
487 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
488 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
489 int err;
490
491 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
492 USB_TYPE_CLASS | USB_DIR_IN
493 |USB_RECIP_INTERFACE,
494 0, iface_no, &ctx->ncm_parm,
495 sizeof(ctx->ncm_parm));
496 if (err < 0) {
497 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
498 return err; /* GET_NTB_PARAMETERS is required */
499 }
500
501 /* set CRC Mode */
502 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
503 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
504 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
505 USB_TYPE_CLASS | USB_DIR_OUT
506 | USB_RECIP_INTERFACE,
507 USB_CDC_NCM_CRC_NOT_APPENDED,
508 iface_no, NULL, 0);
509 if (err < 0)
510 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
511 }
512
513 /* set NTB format, if both formats are supported.
514 *
515 * "The host shall only send this command while the NCM Data
516 * Interface is in alternate setting 0."
517 */
518 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
519 USB_CDC_NCM_NTB32_SUPPORTED) {
520 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
521 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
522 USB_TYPE_CLASS | USB_DIR_OUT
523 | USB_RECIP_INTERFACE,
524 USB_CDC_NCM_NTB16_FORMAT,
525 iface_no, NULL, 0);
526 if (err < 0)
527 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
528 }
529
530 /* set initial device values */
531 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
532 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
533 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
534 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
535 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
536 /* devices prior to NCM Errata shall set this field to zero */
537 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
538
539 dev_dbg(&dev->intf->dev,
540 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
541 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
542 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
543
544 /* max count of tx datagrams */
545 if ((ctx->tx_max_datagrams == 0) ||
546 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
547 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
548
549 /* set up maximum NDP size */
550 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
551
552 /* initial coalescing timer interval */
553 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
554
555 return 0;
556 }
557
558 /* set a new max datagram size */
559 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
560 {
561 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
562 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
563 __le16 max_datagram_size;
564 u16 mbim_mtu;
565 int err;
566
567 /* set default based on descriptors */
568 ctx->max_datagram_size = clamp_t(u32, new_size,
569 cdc_ncm_min_dgram_size(dev),
570 CDC_NCM_MAX_DATAGRAM_SIZE);
571
572 /* inform the device about the selected Max Datagram Size? */
573 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
574 goto out;
575
576 /* read current mtu value from device */
577 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
578 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
579 0, iface_no, &max_datagram_size, 2);
580 if (err < 0) {
581 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
582 goto out;
583 }
584
585 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
586 goto out;
587
588 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
589 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
590 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
591 0, iface_no, &max_datagram_size, 2);
592 if (err < 0)
593 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
594
595 out:
596 /* set MTU to max supported by the device if necessary */
597 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
598
599 /* do not exceed operater preferred MTU */
600 if (ctx->mbim_extended_desc) {
601 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
602 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
603 dev->net->mtu = mbim_mtu;
604 }
605 }
606
607 static void cdc_ncm_fix_modulus(struct usbnet *dev)
608 {
609 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
610 u32 val;
611
612 /*
613 * verify that the structure alignment is:
614 * - power of two
615 * - not greater than the maximum transmit length
616 * - not less than four bytes
617 */
618 val = ctx->tx_ndp_modulus;
619
620 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
621 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
622 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
623 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
624 }
625
626 /*
627 * verify that the payload alignment is:
628 * - power of two
629 * - not greater than the maximum transmit length
630 * - not less than four bytes
631 */
632 val = ctx->tx_modulus;
633
634 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
635 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
636 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
637 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
638 }
639
640 /* verify the payload remainder */
641 if (ctx->tx_remainder >= ctx->tx_modulus) {
642 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
643 ctx->tx_remainder = 0;
644 }
645
646 /* adjust TX-remainder according to NCM specification. */
647 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
648 (ctx->tx_modulus - 1));
649 }
650
651 static int cdc_ncm_setup(struct usbnet *dev)
652 {
653 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
654 u32 def_rx, def_tx;
655
656 /* be conservative when selecting intial buffer size to
657 * increase the number of hosts this will work for
658 */
659 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
660 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
661 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
662 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
663
664 /* clamp rx_max and tx_max and inform device */
665 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
666
667 /* sanitize the modulus and remainder values */
668 cdc_ncm_fix_modulus(dev);
669
670 /* set max datagram size */
671 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
672 return 0;
673 }
674
675 static void
676 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
677 {
678 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
679 u8 ep;
680
681 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
682
683 e = intf->cur_altsetting->endpoint + ep;
684 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
685 case USB_ENDPOINT_XFER_INT:
686 if (usb_endpoint_dir_in(&e->desc)) {
687 if (!dev->status)
688 dev->status = e;
689 }
690 break;
691
692 case USB_ENDPOINT_XFER_BULK:
693 if (usb_endpoint_dir_in(&e->desc)) {
694 if (!in)
695 in = e;
696 } else {
697 if (!out)
698 out = e;
699 }
700 break;
701
702 default:
703 break;
704 }
705 }
706 if (in && !dev->in)
707 dev->in = usb_rcvbulkpipe(dev->udev,
708 in->desc.bEndpointAddress &
709 USB_ENDPOINT_NUMBER_MASK);
710 if (out && !dev->out)
711 dev->out = usb_sndbulkpipe(dev->udev,
712 out->desc.bEndpointAddress &
713 USB_ENDPOINT_NUMBER_MASK);
714 }
715
716 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
717 {
718 if (ctx == NULL)
719 return;
720
721 if (ctx->tx_rem_skb != NULL) {
722 dev_kfree_skb_any(ctx->tx_rem_skb);
723 ctx->tx_rem_skb = NULL;
724 }
725
726 if (ctx->tx_curr_skb != NULL) {
727 dev_kfree_skb_any(ctx->tx_curr_skb);
728 ctx->tx_curr_skb = NULL;
729 }
730
731 kfree(ctx->delayed_ndp16);
732
733 kfree(ctx);
734 }
735
736 /* we need to override the usbnet change_mtu ndo for two reasons:
737 * - respect the negotiated maximum datagram size
738 * - avoid unwanted changes to rx and tx buffers
739 */
740 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
741 {
742 struct usbnet *dev = netdev_priv(net);
743 int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
744
745 if (new_mtu <= 0 || new_mtu > maxmtu)
746 return -EINVAL;
747
748 net->mtu = new_mtu;
749 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
750
751 return 0;
752 }
753 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
754
755 static const struct net_device_ops cdc_ncm_netdev_ops = {
756 .ndo_open = usbnet_open,
757 .ndo_stop = usbnet_stop,
758 .ndo_start_xmit = usbnet_start_xmit,
759 .ndo_tx_timeout = usbnet_tx_timeout,
760 .ndo_change_mtu = cdc_ncm_change_mtu,
761 .ndo_set_mac_address = eth_mac_addr,
762 .ndo_validate_addr = eth_validate_addr,
763 };
764
765 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
766 {
767 struct cdc_ncm_ctx *ctx;
768 struct usb_driver *driver;
769 u8 *buf;
770 int len;
771 int temp;
772 u8 iface_no;
773 struct usb_cdc_parsed_header hdr;
774
775 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
776 if (!ctx)
777 return -ENOMEM;
778
779 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
780 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
781 ctx->bh.data = (unsigned long)dev;
782 ctx->bh.func = cdc_ncm_txpath_bh;
783 atomic_set(&ctx->stop, 0);
784 spin_lock_init(&ctx->mtx);
785
786 /* store ctx pointer in device data field */
787 dev->data[0] = (unsigned long)ctx;
788
789 /* only the control interface can be successfully probed */
790 ctx->control = intf;
791
792 /* get some pointers */
793 driver = driver_of(intf);
794 buf = intf->cur_altsetting->extra;
795 len = intf->cur_altsetting->extralen;
796
797 /* parse through descriptors associated with control interface */
798 cdc_parse_cdc_header(&hdr, intf, buf, len);
799
800 if (hdr.usb_cdc_union_desc)
801 ctx->data = usb_ifnum_to_if(dev->udev,
802 hdr.usb_cdc_union_desc->bSlaveInterface0);
803 ctx->ether_desc = hdr.usb_cdc_ether_desc;
804 ctx->func_desc = hdr.usb_cdc_ncm_desc;
805 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
806 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
807
808 /* some buggy devices have an IAD but no CDC Union */
809 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
810 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
811 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
812 }
813
814 /* check if we got everything */
815 if (!ctx->data) {
816 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
817 goto error;
818 }
819 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
820 if (!ctx->mbim_desc) {
821 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
822 goto error;
823 }
824 } else {
825 if (!ctx->ether_desc || !ctx->func_desc) {
826 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
827 goto error;
828 }
829 }
830
831 /* claim data interface, if different from control */
832 if (ctx->data != ctx->control) {
833 temp = usb_driver_claim_interface(driver, ctx->data, dev);
834 if (temp) {
835 dev_dbg(&intf->dev, "failed to claim data intf\n");
836 goto error;
837 }
838 }
839
840 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
841
842 /* Reset data interface. Some devices will not reset properly
843 * unless they are configured first. Toggle the altsetting to
844 * force a reset
845 */
846 usb_set_interface(dev->udev, iface_no, data_altsetting);
847 temp = usb_set_interface(dev->udev, iface_no, 0);
848 if (temp) {
849 dev_dbg(&intf->dev, "set interface failed\n");
850 goto error2;
851 }
852
853 /* initialize basic device settings */
854 if (cdc_ncm_init(dev))
855 goto error2;
856
857 /* configure data interface */
858 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
859 if (temp) {
860 dev_dbg(&intf->dev, "set interface failed\n");
861 goto error2;
862 }
863
864 cdc_ncm_find_endpoints(dev, ctx->data);
865 cdc_ncm_find_endpoints(dev, ctx->control);
866 if (!dev->in || !dev->out || !dev->status) {
867 dev_dbg(&intf->dev, "failed to collect endpoints\n");
868 goto error2;
869 }
870
871 usb_set_intfdata(ctx->data, dev);
872 usb_set_intfdata(ctx->control, dev);
873
874 if (ctx->ether_desc) {
875 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
876 if (temp) {
877 dev_dbg(&intf->dev, "failed to get mac address\n");
878 goto error2;
879 }
880 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
881 }
882
883 /* finish setting up the device specific data */
884 cdc_ncm_setup(dev);
885
886 /* Device-specific flags */
887 ctx->drvflags = drvflags;
888
889 /* Allocate the delayed NDP if needed. */
890 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
891 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
892 if (!ctx->delayed_ndp16)
893 goto error2;
894 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
895 }
896
897 /* override ethtool_ops */
898 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
899
900 /* add our sysfs attrs */
901 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
902
903 /* must handle MTU changes */
904 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
905
906 return 0;
907
908 error2:
909 usb_set_intfdata(ctx->control, NULL);
910 usb_set_intfdata(ctx->data, NULL);
911 if (ctx->data != ctx->control)
912 usb_driver_release_interface(driver, ctx->data);
913 error:
914 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
915 dev->data[0] = 0;
916 dev_info(&intf->dev, "bind() failure\n");
917 return -ENODEV;
918 }
919 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
920
921 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
922 {
923 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
924 struct usb_driver *driver = driver_of(intf);
925
926 if (ctx == NULL)
927 return; /* no setup */
928
929 atomic_set(&ctx->stop, 1);
930
931 if (hrtimer_active(&ctx->tx_timer))
932 hrtimer_cancel(&ctx->tx_timer);
933
934 tasklet_kill(&ctx->bh);
935
936 /* handle devices with combined control and data interface */
937 if (ctx->control == ctx->data)
938 ctx->data = NULL;
939
940 /* disconnect master --> disconnect slave */
941 if (intf == ctx->control && ctx->data) {
942 usb_set_intfdata(ctx->data, NULL);
943 usb_driver_release_interface(driver, ctx->data);
944 ctx->data = NULL;
945
946 } else if (intf == ctx->data && ctx->control) {
947 usb_set_intfdata(ctx->control, NULL);
948 usb_driver_release_interface(driver, ctx->control);
949 ctx->control = NULL;
950 }
951
952 usb_set_intfdata(intf, NULL);
953 cdc_ncm_free(ctx);
954 }
955 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
956
957 /* Return the number of the MBIM control interface altsetting iff it
958 * is preferred and available,
959 */
960 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
961 {
962 struct usb_host_interface *alt;
963
964 /* The MBIM spec defines a NCM compatible default altsetting,
965 * which we may have matched:
966 *
967 * "Functions that implement both NCM 1.0 and MBIM (an
968 * “NCM/MBIM function”) according to this recommendation
969 * shall provide two alternate settings for the
970 * Communication Interface. Alternate setting 0, and the
971 * associated class and endpoint descriptors, shall be
972 * constructed according to the rules given for the
973 * Communication Interface in section 5 of [USBNCM10].
974 * Alternate setting 1, and the associated class and
975 * endpoint descriptors, shall be constructed according to
976 * the rules given in section 6 (USB Device Model) of this
977 * specification."
978 */
979 if (intf->num_altsetting < 2)
980 return intf->cur_altsetting->desc.bAlternateSetting;
981
982 if (prefer_mbim) {
983 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
984 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
985 return CDC_NCM_COMM_ALTSETTING_MBIM;
986 }
987 return CDC_NCM_COMM_ALTSETTING_NCM;
988 }
989 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
990
991 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
992 {
993 /* MBIM backwards compatible function? */
994 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
995 return -ENODEV;
996
997 /* The NCM data altsetting is fixed, so we hard-coded it.
998 * Additionally, generic NCM devices are assumed to accept arbitrarily
999 * placed NDP.
1000 */
1001 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1002 }
1003
1004 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1005 {
1006 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1007
1008 if (skb->len + align > max)
1009 align = max - skb->len;
1010 if (align && skb_tailroom(skb) >= align)
1011 memset(skb_put(skb, align), 0, align);
1012 }
1013
1014 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1015 * allocating a new one within skb
1016 */
1017 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1018 {
1019 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1020 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1021 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1022
1023 /* If NDP should be moved to the end of the NCM package, we can't follow the
1024 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1025 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1026 */
1027 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1028 if (ctx->delayed_ndp16->dwSignature == sign)
1029 return ctx->delayed_ndp16;
1030
1031 /* We can only push a single NDP to the end. Return
1032 * NULL to send what we've already got and queue this
1033 * skb for later.
1034 */
1035 else if (ctx->delayed_ndp16->dwSignature)
1036 return NULL;
1037 }
1038
1039 /* follow the chain of NDPs, looking for a match */
1040 while (ndpoffset) {
1041 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1042 if (ndp16->dwSignature == sign)
1043 return ndp16;
1044 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1045 }
1046
1047 /* align new NDP */
1048 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1049 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1050
1051 /* verify that there is room for the NDP and the datagram (reserve) */
1052 if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1053 return NULL;
1054
1055 /* link to it */
1056 if (ndp16)
1057 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1058 else
1059 nth16->wNdpIndex = cpu_to_le16(skb->len);
1060
1061 /* push a new empty NDP */
1062 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1063 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1064 else
1065 ndp16 = ctx->delayed_ndp16;
1066
1067 ndp16->dwSignature = sign;
1068 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1069 return ndp16;
1070 }
1071
1072 struct sk_buff *
1073 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1074 {
1075 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1076 struct usb_cdc_ncm_nth16 *nth16;
1077 struct usb_cdc_ncm_ndp16 *ndp16;
1078 struct sk_buff *skb_out;
1079 u16 n = 0, index, ndplen;
1080 u8 ready2send = 0;
1081 u32 delayed_ndp_size;
1082
1083 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1084 * accordingly. Otherwise, we should check here.
1085 */
1086 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1087 delayed_ndp_size = ctx->max_ndp_size;
1088 else
1089 delayed_ndp_size = 0;
1090
1091 /* if there is a remaining skb, it gets priority */
1092 if (skb != NULL) {
1093 swap(skb, ctx->tx_rem_skb);
1094 swap(sign, ctx->tx_rem_sign);
1095 } else {
1096 ready2send = 1;
1097 }
1098
1099 /* check if we are resuming an OUT skb */
1100 skb_out = ctx->tx_curr_skb;
1101
1102 /* allocate a new OUT skb */
1103 if (!skb_out) {
1104 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1105 if (skb_out == NULL) {
1106 if (skb != NULL) {
1107 dev_kfree_skb_any(skb);
1108 dev->net->stats.tx_dropped++;
1109 }
1110 goto exit_no_skb;
1111 }
1112 /* fill out the initial 16-bit NTB header */
1113 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1114 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1115 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1116 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1117
1118 /* count total number of frames in this NTB */
1119 ctx->tx_curr_frame_num = 0;
1120
1121 /* recent payload counter for this skb_out */
1122 ctx->tx_curr_frame_payload = 0;
1123 }
1124
1125 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1126 /* send any remaining skb first */
1127 if (skb == NULL) {
1128 skb = ctx->tx_rem_skb;
1129 sign = ctx->tx_rem_sign;
1130 ctx->tx_rem_skb = NULL;
1131
1132 /* check for end of skb */
1133 if (skb == NULL)
1134 break;
1135 }
1136
1137 /* get the appropriate NDP for this skb */
1138 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1139
1140 /* align beginning of next frame */
1141 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1142
1143 /* check if we had enough room left for both NDP and frame */
1144 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1145 if (n == 0) {
1146 /* won't fit, MTU problem? */
1147 dev_kfree_skb_any(skb);
1148 skb = NULL;
1149 dev->net->stats.tx_dropped++;
1150 } else {
1151 /* no room for skb - store for later */
1152 if (ctx->tx_rem_skb != NULL) {
1153 dev_kfree_skb_any(ctx->tx_rem_skb);
1154 dev->net->stats.tx_dropped++;
1155 }
1156 ctx->tx_rem_skb = skb;
1157 ctx->tx_rem_sign = sign;
1158 skb = NULL;
1159 ready2send = 1;
1160 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1161 }
1162 break;
1163 }
1164
1165 /* calculate frame number withing this NDP */
1166 ndplen = le16_to_cpu(ndp16->wLength);
1167 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1168
1169 /* OK, add this skb */
1170 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1171 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1172 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1173 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1174 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1175 dev_kfree_skb_any(skb);
1176 skb = NULL;
1177
1178 /* send now if this NDP is full */
1179 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1180 ready2send = 1;
1181 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1182 break;
1183 }
1184 }
1185
1186 /* free up any dangling skb */
1187 if (skb != NULL) {
1188 dev_kfree_skb_any(skb);
1189 skb = NULL;
1190 dev->net->stats.tx_dropped++;
1191 }
1192
1193 ctx->tx_curr_frame_num = n;
1194
1195 if (n == 0) {
1196 /* wait for more frames */
1197 /* push variables */
1198 ctx->tx_curr_skb = skb_out;
1199 goto exit_no_skb;
1200
1201 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1202 /* wait for more frames */
1203 /* push variables */
1204 ctx->tx_curr_skb = skb_out;
1205 /* set the pending count */
1206 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1207 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1208 goto exit_no_skb;
1209
1210 } else {
1211 if (n == ctx->tx_max_datagrams)
1212 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1213 /* frame goes out */
1214 /* variables will be reset at next call */
1215 }
1216
1217 /* If requested, put NDP at end of frame. */
1218 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1219 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1220 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1221 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1222 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1223
1224 /* Zero out delayed NDP - signature checking will naturally fail. */
1225 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1226 }
1227
1228 /* If collected data size is less or equal ctx->min_tx_pkt
1229 * bytes, we send buffers as it is. If we get more data, it
1230 * would be more efficient for USB HS mobile device with DMA
1231 * engine to receive a full size NTB, than canceling DMA
1232 * transfer and receiving a short packet.
1233 *
1234 * This optimization support is pointless if we end up sending
1235 * a ZLP after full sized NTBs.
1236 */
1237 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1238 skb_out->len > ctx->min_tx_pkt)
1239 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1240 ctx->tx_max - skb_out->len);
1241 else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1242 *skb_put(skb_out, 1) = 0; /* force short packet */
1243
1244 /* set final frame length */
1245 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1246 nth16->wBlockLength = cpu_to_le16(skb_out->len);
1247
1248 /* return skb */
1249 ctx->tx_curr_skb = NULL;
1250
1251 /* keep private stats: framing overhead and number of NTBs */
1252 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1253 ctx->tx_ntbs++;
1254
1255 /* usbnet will count all the framing overhead by default.
1256 * Adjust the stats so that the tx_bytes counter show real
1257 * payload data instead.
1258 */
1259 usbnet_set_skb_tx_stats(skb_out, n,
1260 (long)ctx->tx_curr_frame_payload - skb_out->len);
1261
1262 return skb_out;
1263
1264 exit_no_skb:
1265 /* Start timer, if there is a remaining non-empty skb */
1266 if (ctx->tx_curr_skb != NULL && n > 0)
1267 cdc_ncm_tx_timeout_start(ctx);
1268 return NULL;
1269 }
1270 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1271
1272 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1273 {
1274 /* start timer, if not already started */
1275 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1276 hrtimer_start(&ctx->tx_timer,
1277 ktime_set(0, ctx->timer_interval),
1278 HRTIMER_MODE_REL);
1279 }
1280
1281 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1282 {
1283 struct cdc_ncm_ctx *ctx =
1284 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1285
1286 if (!atomic_read(&ctx->stop))
1287 tasklet_schedule(&ctx->bh);
1288 return HRTIMER_NORESTART;
1289 }
1290
1291 static void cdc_ncm_txpath_bh(unsigned long param)
1292 {
1293 struct usbnet *dev = (struct usbnet *)param;
1294 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1295
1296 spin_lock_bh(&ctx->mtx);
1297 if (ctx->tx_timer_pending != 0) {
1298 ctx->tx_timer_pending--;
1299 cdc_ncm_tx_timeout_start(ctx);
1300 spin_unlock_bh(&ctx->mtx);
1301 } else if (dev->net != NULL) {
1302 ctx->tx_reason_timeout++; /* count reason for transmitting */
1303 spin_unlock_bh(&ctx->mtx);
1304 netif_tx_lock_bh(dev->net);
1305 usbnet_start_xmit(NULL, dev->net);
1306 netif_tx_unlock_bh(dev->net);
1307 } else {
1308 spin_unlock_bh(&ctx->mtx);
1309 }
1310 }
1311
1312 struct sk_buff *
1313 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1314 {
1315 struct sk_buff *skb_out;
1316 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1317
1318 /*
1319 * The Ethernet API we are using does not support transmitting
1320 * multiple Ethernet frames in a single call. This driver will
1321 * accumulate multiple Ethernet frames and send out a larger
1322 * USB frame when the USB buffer is full or when a single jiffies
1323 * timeout happens.
1324 */
1325 if (ctx == NULL)
1326 goto error;
1327
1328 spin_lock_bh(&ctx->mtx);
1329 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1330 spin_unlock_bh(&ctx->mtx);
1331 return skb_out;
1332
1333 error:
1334 if (skb != NULL)
1335 dev_kfree_skb_any(skb);
1336
1337 return NULL;
1338 }
1339 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1340
1341 /* verify NTB header and return offset of first NDP, or negative error */
1342 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1343 {
1344 struct usbnet *dev = netdev_priv(skb_in->dev);
1345 struct usb_cdc_ncm_nth16 *nth16;
1346 int len;
1347 int ret = -EINVAL;
1348
1349 if (ctx == NULL)
1350 goto error;
1351
1352 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1353 sizeof(struct usb_cdc_ncm_ndp16))) {
1354 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1355 goto error;
1356 }
1357
1358 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1359
1360 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1361 netif_dbg(dev, rx_err, dev->net,
1362 "invalid NTH16 signature <%#010x>\n",
1363 le32_to_cpu(nth16->dwSignature));
1364 goto error;
1365 }
1366
1367 len = le16_to_cpu(nth16->wBlockLength);
1368 if (len > ctx->rx_max) {
1369 netif_dbg(dev, rx_err, dev->net,
1370 "unsupported NTB block length %u/%u\n", len,
1371 ctx->rx_max);
1372 goto error;
1373 }
1374
1375 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1376 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1377 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1378 netif_dbg(dev, rx_err, dev->net,
1379 "sequence number glitch prev=%d curr=%d\n",
1380 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1381 }
1382 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1383
1384 ret = le16_to_cpu(nth16->wNdpIndex);
1385 error:
1386 return ret;
1387 }
1388 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1389
1390 /* verify NDP header and return number of datagrams, or negative error */
1391 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1392 {
1393 struct usbnet *dev = netdev_priv(skb_in->dev);
1394 struct usb_cdc_ncm_ndp16 *ndp16;
1395 int ret = -EINVAL;
1396
1397 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1398 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1399 ndpoffset);
1400 goto error;
1401 }
1402 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1403
1404 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1405 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1406 le16_to_cpu(ndp16->wLength));
1407 goto error;
1408 }
1409
1410 ret = ((le16_to_cpu(ndp16->wLength) -
1411 sizeof(struct usb_cdc_ncm_ndp16)) /
1412 sizeof(struct usb_cdc_ncm_dpe16));
1413 ret--; /* we process NDP entries except for the last one */
1414
1415 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1416 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1417 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1418 ret = -EINVAL;
1419 }
1420
1421 error:
1422 return ret;
1423 }
1424 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1425
1426 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1427 {
1428 struct sk_buff *skb;
1429 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1430 int len;
1431 int nframes;
1432 int x;
1433 int offset;
1434 struct usb_cdc_ncm_ndp16 *ndp16;
1435 struct usb_cdc_ncm_dpe16 *dpe16;
1436 int ndpoffset;
1437 int loopcount = 50; /* arbitrary max preventing infinite loop */
1438 u32 payload = 0;
1439
1440 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1441 if (ndpoffset < 0)
1442 goto error;
1443
1444 next_ndp:
1445 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1446 if (nframes < 0)
1447 goto error;
1448
1449 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1450
1451 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1452 netif_dbg(dev, rx_err, dev->net,
1453 "invalid DPT16 signature <%#010x>\n",
1454 le32_to_cpu(ndp16->dwSignature));
1455 goto err_ndp;
1456 }
1457 dpe16 = ndp16->dpe16;
1458
1459 for (x = 0; x < nframes; x++, dpe16++) {
1460 offset = le16_to_cpu(dpe16->wDatagramIndex);
1461 len = le16_to_cpu(dpe16->wDatagramLength);
1462
1463 /*
1464 * CDC NCM ch. 3.7
1465 * All entries after first NULL entry are to be ignored
1466 */
1467 if ((offset == 0) || (len == 0)) {
1468 if (!x)
1469 goto err_ndp; /* empty NTB */
1470 break;
1471 }
1472
1473 /* sanity checking */
1474 if (((offset + len) > skb_in->len) ||
1475 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1476 netif_dbg(dev, rx_err, dev->net,
1477 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1478 x, offset, len, skb_in);
1479 if (!x)
1480 goto err_ndp;
1481 break;
1482
1483 } else {
1484 /* create a fresh copy to reduce truesize */
1485 skb = netdev_alloc_skb_ip_align(dev->net, len);
1486 if (!skb)
1487 goto error;
1488 memcpy(skb_put(skb, len), skb_in->data + offset, len);
1489 usbnet_skb_return(dev, skb);
1490 payload += len; /* count payload bytes in this NTB */
1491 }
1492 }
1493 err_ndp:
1494 /* are there more NDPs to process? */
1495 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1496 if (ndpoffset && loopcount--)
1497 goto next_ndp;
1498
1499 /* update stats */
1500 ctx->rx_overhead += skb_in->len - payload;
1501 ctx->rx_ntbs++;
1502
1503 return 1;
1504 error:
1505 return 0;
1506 }
1507 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1508
1509 static void
1510 cdc_ncm_speed_change(struct usbnet *dev,
1511 struct usb_cdc_speed_change *data)
1512 {
1513 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1514 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1515
1516 /*
1517 * Currently the USB-NET API does not support reporting the actual
1518 * device speed. Do print it instead.
1519 */
1520 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1521 netif_info(dev, link, dev->net,
1522 "%u mbit/s downlink %u mbit/s uplink\n",
1523 (unsigned int)(rx_speed / 1000000U),
1524 (unsigned int)(tx_speed / 1000000U));
1525 } else {
1526 netif_info(dev, link, dev->net,
1527 "%u kbit/s downlink %u kbit/s uplink\n",
1528 (unsigned int)(rx_speed / 1000U),
1529 (unsigned int)(tx_speed / 1000U));
1530 }
1531 }
1532
1533 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1534 {
1535 struct cdc_ncm_ctx *ctx;
1536 struct usb_cdc_notification *event;
1537
1538 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1539
1540 if (urb->actual_length < sizeof(*event))
1541 return;
1542
1543 /* test for split data in 8-byte chunks */
1544 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1545 cdc_ncm_speed_change(dev,
1546 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1547 return;
1548 }
1549
1550 event = urb->transfer_buffer;
1551
1552 switch (event->bNotificationType) {
1553 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1554 /*
1555 * According to the CDC NCM specification ch.7.1
1556 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1557 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1558 */
1559 netif_info(dev, link, dev->net,
1560 "network connection: %sconnected\n",
1561 !!event->wValue ? "" : "dis");
1562 usbnet_link_change(dev, !!event->wValue, 0);
1563 break;
1564
1565 case USB_CDC_NOTIFY_SPEED_CHANGE:
1566 if (urb->actual_length < (sizeof(*event) +
1567 sizeof(struct usb_cdc_speed_change)))
1568 set_bit(EVENT_STS_SPLIT, &dev->flags);
1569 else
1570 cdc_ncm_speed_change(dev,
1571 (struct usb_cdc_speed_change *)&event[1]);
1572 break;
1573
1574 default:
1575 dev_dbg(&dev->udev->dev,
1576 "NCM: unexpected notification 0x%02x!\n",
1577 event->bNotificationType);
1578 break;
1579 }
1580 }
1581
1582 static const struct driver_info cdc_ncm_info = {
1583 .description = "CDC NCM",
1584 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1585 | FLAG_LINK_INTR,
1586 .bind = cdc_ncm_bind,
1587 .unbind = cdc_ncm_unbind,
1588 .manage_power = usbnet_manage_power,
1589 .status = cdc_ncm_status,
1590 .rx_fixup = cdc_ncm_rx_fixup,
1591 .tx_fixup = cdc_ncm_tx_fixup,
1592 };
1593
1594 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1595 static const struct driver_info wwan_info = {
1596 .description = "Mobile Broadband Network Device",
1597 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1598 | FLAG_LINK_INTR | FLAG_WWAN,
1599 .bind = cdc_ncm_bind,
1600 .unbind = cdc_ncm_unbind,
1601 .manage_power = usbnet_manage_power,
1602 .status = cdc_ncm_status,
1603 .rx_fixup = cdc_ncm_rx_fixup,
1604 .tx_fixup = cdc_ncm_tx_fixup,
1605 };
1606
1607 /* Same as wwan_info, but with FLAG_NOARP */
1608 static const struct driver_info wwan_noarp_info = {
1609 .description = "Mobile Broadband Network Device (NO ARP)",
1610 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1611 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1612 .bind = cdc_ncm_bind,
1613 .unbind = cdc_ncm_unbind,
1614 .manage_power = usbnet_manage_power,
1615 .status = cdc_ncm_status,
1616 .rx_fixup = cdc_ncm_rx_fixup,
1617 .tx_fixup = cdc_ncm_tx_fixup,
1618 };
1619
1620 static const struct usb_device_id cdc_devs[] = {
1621 /* Ericsson MBM devices like F5521gw */
1622 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1623 | USB_DEVICE_ID_MATCH_VENDOR,
1624 .idVendor = 0x0bdb,
1625 .bInterfaceClass = USB_CLASS_COMM,
1626 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1627 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1628 .driver_info = (unsigned long) &wwan_info,
1629 },
1630
1631 /* Telit LE910 V2 */
1632 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1633 USB_CLASS_COMM,
1634 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1635 .driver_info = (unsigned long)&wwan_noarp_info,
1636 },
1637
1638 /* DW5812 LTE Verizon Mobile Broadband Card
1639 * Unlike DW5550 this device requires FLAG_NOARP
1640 */
1641 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1642 USB_CLASS_COMM,
1643 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1644 .driver_info = (unsigned long)&wwan_noarp_info,
1645 },
1646
1647 /* DW5813 LTE AT&T Mobile Broadband Card
1648 * Unlike DW5550 this device requires FLAG_NOARP
1649 */
1650 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1651 USB_CLASS_COMM,
1652 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1653 .driver_info = (unsigned long)&wwan_noarp_info,
1654 },
1655
1656 /* Dell branded MBM devices like DW5550 */
1657 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1658 | USB_DEVICE_ID_MATCH_VENDOR,
1659 .idVendor = 0x413c,
1660 .bInterfaceClass = USB_CLASS_COMM,
1661 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1662 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1663 .driver_info = (unsigned long) &wwan_info,
1664 },
1665
1666 /* Toshiba branded MBM devices */
1667 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1668 | USB_DEVICE_ID_MATCH_VENDOR,
1669 .idVendor = 0x0930,
1670 .bInterfaceClass = USB_CLASS_COMM,
1671 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1672 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1673 .driver_info = (unsigned long) &wwan_info,
1674 },
1675
1676 /* tag Huawei devices as wwan */
1677 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1678 USB_CLASS_COMM,
1679 USB_CDC_SUBCLASS_NCM,
1680 USB_CDC_PROTO_NONE),
1681 .driver_info = (unsigned long)&wwan_info,
1682 },
1683
1684 /* Infineon(now Intel) HSPA Modem platform */
1685 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1686 USB_CLASS_COMM,
1687 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1688 .driver_info = (unsigned long)&wwan_noarp_info,
1689 },
1690
1691 /* Generic CDC-NCM devices */
1692 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1693 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1694 .driver_info = (unsigned long)&cdc_ncm_info,
1695 },
1696 {
1697 },
1698 };
1699 MODULE_DEVICE_TABLE(usb, cdc_devs);
1700
1701 static struct usb_driver cdc_ncm_driver = {
1702 .name = "cdc_ncm",
1703 .id_table = cdc_devs,
1704 .probe = usbnet_probe,
1705 .disconnect = usbnet_disconnect,
1706 .suspend = usbnet_suspend,
1707 .resume = usbnet_resume,
1708 .reset_resume = usbnet_resume,
1709 .supports_autosuspend = 1,
1710 .disable_hub_initiated_lpm = 1,
1711 };
1712
1713 module_usb_driver(cdc_ncm_driver);
1714
1715 MODULE_AUTHOR("Hans Petter Selasky");
1716 MODULE_DESCRIPTION("USB CDC NCM host driver");
1717 MODULE_LICENSE("Dual BSD/GPL");
Linux kernel - Deliverables
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