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, 0644);
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 #define CDC_NCM_LOW_MEM_MAX_CNT 10
93
cdc_ncm_get_sset_count(struct net_device __always_unused * netdev,int sset)94 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
95 {
96 switch (sset) {
97 case ETH_SS_STATS:
98 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
99 default:
100 return -EOPNOTSUPP;
101 }
102 }
103
cdc_ncm_get_ethtool_stats(struct net_device * netdev,struct ethtool_stats __always_unused * stats,u64 * data)104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
105 struct ethtool_stats __always_unused *stats,
106 u64 *data)
107 {
108 struct usbnet *dev = netdev_priv(netdev);
109 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
110 int i;
111 char *p = NULL;
112
113 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
114 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
115 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
116 }
117 }
118
cdc_ncm_get_strings(struct net_device __always_unused * netdev,u32 stringset,u8 * data)119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
120 {
121 u8 *p = data;
122 int i;
123
124 switch (stringset) {
125 case ETH_SS_STATS:
126 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
127 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
128 p += ETH_GSTRING_LEN;
129 }
130 }
131 }
132
133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
134
135 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
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 .get_link_ksettings = usbnet_get_link_ksettings,
146 .set_link_ksettings = usbnet_set_link_ksettings,
147 };
148
cdc_ncm_check_rx_max(struct usbnet * dev,u32 new_rx)149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
150 {
151 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
152 u32 val, max, min;
153
154 /* clamp new_rx to sane values */
155 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
156 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
157
158 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
159 if (max < min) {
160 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
161 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
162 max = min;
163 }
164
165 val = clamp_t(u32, new_rx, min, max);
166 if (val != new_rx)
167 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
168
169 return val;
170 }
171
cdc_ncm_check_tx_max(struct usbnet * dev,u32 new_tx)172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
173 {
174 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
175 u32 val, max, min;
176
177 /* clamp new_tx to sane values */
178 if (ctx->is_ndp16)
179 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
180 else
181 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth32);
182
183 if (le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) == 0)
184 max = CDC_NCM_NTB_MAX_SIZE_TX; /* dwNtbOutMaxSize not set */
185 else
186 max = clamp_t(u32, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize),
187 USB_CDC_NCM_NTB_MIN_OUT_SIZE,
188 CDC_NCM_NTB_MAX_SIZE_TX);
189
190 /* some devices set dwNtbOutMaxSize too low for the above default */
191 min = min(min, max);
192
193 val = clamp_t(u32, new_tx, min, max);
194 if (val != new_tx)
195 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
196
197 return val;
198 }
199
cdc_ncm_show_min_tx_pkt(struct device * d,struct device_attribute * attr,char * buf)200 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
201 {
202 struct usbnet *dev = netdev_priv(to_net_dev(d));
203 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
204
205 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
206 }
207
cdc_ncm_show_rx_max(struct device * d,struct device_attribute * attr,char * buf)208 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
209 {
210 struct usbnet *dev = netdev_priv(to_net_dev(d));
211 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
212
213 return sprintf(buf, "%u\n", ctx->rx_max);
214 }
215
cdc_ncm_show_tx_max(struct device * d,struct device_attribute * attr,char * buf)216 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
217 {
218 struct usbnet *dev = netdev_priv(to_net_dev(d));
219 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
220
221 return sprintf(buf, "%u\n", ctx->tx_max);
222 }
223
cdc_ncm_show_tx_timer_usecs(struct device * d,struct device_attribute * attr,char * buf)224 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
225 {
226 struct usbnet *dev = netdev_priv(to_net_dev(d));
227 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
228
229 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
230 }
231
cdc_ncm_store_min_tx_pkt(struct device * d,struct device_attribute * attr,const char * buf,size_t len)232 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
233 {
234 struct usbnet *dev = netdev_priv(to_net_dev(d));
235 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
236 unsigned long val;
237
238 /* no need to restrict values - anything from 0 to infinity is OK */
239 if (kstrtoul(buf, 0, &val))
240 return -EINVAL;
241
242 ctx->min_tx_pkt = val;
243 return len;
244 }
245
cdc_ncm_store_rx_max(struct device * d,struct device_attribute * attr,const char * buf,size_t len)246 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
247 {
248 struct usbnet *dev = netdev_priv(to_net_dev(d));
249 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
250 unsigned long val;
251
252 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
253 return -EINVAL;
254
255 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
256 return len;
257 }
258
cdc_ncm_store_tx_max(struct device * d,struct device_attribute * attr,const char * buf,size_t len)259 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
260 {
261 struct usbnet *dev = netdev_priv(to_net_dev(d));
262 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
263 unsigned long val;
264
265 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
266 return -EINVAL;
267
268 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
269 return len;
270 }
271
cdc_ncm_store_tx_timer_usecs(struct device * d,struct device_attribute * attr,const char * buf,size_t len)272 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
273 {
274 struct usbnet *dev = netdev_priv(to_net_dev(d));
275 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
276 ssize_t ret;
277 unsigned long val;
278
279 ret = kstrtoul(buf, 0, &val);
280 if (ret)
281 return ret;
282 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
283 return -EINVAL;
284
285 spin_lock_bh(&ctx->mtx);
286 ctx->timer_interval = val * NSEC_PER_USEC;
287 if (!ctx->timer_interval)
288 ctx->tx_timer_pending = 0;
289 spin_unlock_bh(&ctx->mtx);
290 return len;
291 }
292
293 static DEVICE_ATTR(min_tx_pkt, 0644, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
294 static DEVICE_ATTR(rx_max, 0644, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
295 static DEVICE_ATTR(tx_max, 0644, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
296 static DEVICE_ATTR(tx_timer_usecs, 0644, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
297
ndp_to_end_show(struct device * d,struct device_attribute * attr,char * buf)298 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
299 {
300 struct usbnet *dev = netdev_priv(to_net_dev(d));
301 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
302
303 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
304 }
305
ndp_to_end_store(struct device * d,struct device_attribute * attr,const char * buf,size_t len)306 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
307 {
308 struct usbnet *dev = netdev_priv(to_net_dev(d));
309 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
310 bool enable;
311
312 if (strtobool(buf, &enable))
313 return -EINVAL;
314
315 /* no change? */
316 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
317 return len;
318
319 if (enable) {
320 if (ctx->is_ndp16 && !ctx->delayed_ndp16) {
321 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
322 if (!ctx->delayed_ndp16)
323 return -ENOMEM;
324 }
325 if (!ctx->is_ndp16 && !ctx->delayed_ndp32) {
326 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
327 if (!ctx->delayed_ndp32)
328 return -ENOMEM;
329 }
330 }
331
332 /* flush pending data before changing flag */
333 netif_tx_lock_bh(dev->net);
334 usbnet_start_xmit(NULL, dev->net);
335 spin_lock_bh(&ctx->mtx);
336 if (enable)
337 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
338 else
339 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
340 spin_unlock_bh(&ctx->mtx);
341 netif_tx_unlock_bh(dev->net);
342
343 return len;
344 }
345 static DEVICE_ATTR_RW(ndp_to_end);
346
347 #define NCM_PARM_ATTR(name, format, tocpu) \
348 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
349 { \
350 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
351 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
352 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
353 } \
354 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
355
356 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
357 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
358 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
359 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
360 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
361 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
362 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
363 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
364 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
365 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
366
367 static struct attribute *cdc_ncm_sysfs_attrs[] = {
368 &dev_attr_min_tx_pkt.attr,
369 &dev_attr_ndp_to_end.attr,
370 &dev_attr_rx_max.attr,
371 &dev_attr_tx_max.attr,
372 &dev_attr_tx_timer_usecs.attr,
373 &dev_attr_bmNtbFormatsSupported.attr,
374 &dev_attr_dwNtbInMaxSize.attr,
375 &dev_attr_wNdpInDivisor.attr,
376 &dev_attr_wNdpInPayloadRemainder.attr,
377 &dev_attr_wNdpInAlignment.attr,
378 &dev_attr_dwNtbOutMaxSize.attr,
379 &dev_attr_wNdpOutDivisor.attr,
380 &dev_attr_wNdpOutPayloadRemainder.attr,
381 &dev_attr_wNdpOutAlignment.attr,
382 &dev_attr_wNtbOutMaxDatagrams.attr,
383 NULL,
384 };
385
386 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
387 .name = "cdc_ncm",
388 .attrs = cdc_ncm_sysfs_attrs,
389 };
390
391 /* handle rx_max and tx_max changes */
cdc_ncm_update_rxtx_max(struct usbnet * dev,u32 new_rx,u32 new_tx)392 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
393 {
394 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
395 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
396 u32 val;
397
398 val = cdc_ncm_check_rx_max(dev, new_rx);
399
400 /* inform device about NTB input size changes */
401 if (val != ctx->rx_max) {
402 __le32 dwNtbInMaxSize = cpu_to_le32(val);
403
404 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
405
406 /* tell device to use new size */
407 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
408 USB_TYPE_CLASS | USB_DIR_OUT
409 | USB_RECIP_INTERFACE,
410 0, iface_no, &dwNtbInMaxSize, 4) < 0)
411 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
412 else
413 ctx->rx_max = val;
414 }
415
416 /* usbnet use these values for sizing rx queues */
417 if (dev->rx_urb_size != ctx->rx_max) {
418 dev->rx_urb_size = ctx->rx_max;
419 if (netif_running(dev->net))
420 usbnet_unlink_rx_urbs(dev);
421 }
422
423 val = cdc_ncm_check_tx_max(dev, new_tx);
424 if (val != ctx->tx_max)
425 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
426
427 /* Adding a pad byte here if necessary simplifies the handling
428 * in cdc_ncm_fill_tx_frame, making tx_max always represent
429 * the real skb max size.
430 *
431 * We cannot use dev->maxpacket here because this is called from
432 * .bind which is called before usbnet sets up dev->maxpacket
433 */
434 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
435 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
436 val++;
437
438 /* we might need to flush any pending tx buffers if running */
439 if (netif_running(dev->net) && val > ctx->tx_max) {
440 netif_tx_lock_bh(dev->net);
441 usbnet_start_xmit(NULL, dev->net);
442 /* make sure tx_curr_skb is reallocated if it was empty */
443 if (ctx->tx_curr_skb) {
444 dev_kfree_skb_any(ctx->tx_curr_skb);
445 ctx->tx_curr_skb = NULL;
446 }
447 ctx->tx_max = val;
448 netif_tx_unlock_bh(dev->net);
449 } else {
450 ctx->tx_max = val;
451 }
452
453 dev->hard_mtu = ctx->tx_max;
454
455 /* max qlen depend on hard_mtu and rx_urb_size */
456 usbnet_update_max_qlen(dev);
457
458 /* never pad more than 3 full USB packets per transfer */
459 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
460 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
461 }
462
463 /* helpers for NCM and MBIM differences */
cdc_ncm_flags(struct usbnet * dev)464 static u8 cdc_ncm_flags(struct usbnet *dev)
465 {
466 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
467
468 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
469 return ctx->mbim_desc->bmNetworkCapabilities;
470 if (ctx->func_desc)
471 return ctx->func_desc->bmNetworkCapabilities;
472 return 0;
473 }
474
cdc_ncm_eth_hlen(struct usbnet * dev)475 static int cdc_ncm_eth_hlen(struct usbnet *dev)
476 {
477 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
478 return 0;
479 return ETH_HLEN;
480 }
481
cdc_ncm_min_dgram_size(struct usbnet * dev)482 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
483 {
484 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
485 return CDC_MBIM_MIN_DATAGRAM_SIZE;
486 return CDC_NCM_MIN_DATAGRAM_SIZE;
487 }
488
cdc_ncm_max_dgram_size(struct usbnet * dev)489 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
490 {
491 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
492
493 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
494 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
495 if (ctx->ether_desc)
496 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
497 return CDC_NCM_MAX_DATAGRAM_SIZE;
498 }
499
500 /* initial one-time device setup. MUST be called with the data interface
501 * in altsetting 0
502 */
cdc_ncm_init(struct usbnet * dev)503 static int cdc_ncm_init(struct usbnet *dev)
504 {
505 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
506 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
507 int err;
508
509 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
510 USB_TYPE_CLASS | USB_DIR_IN
511 |USB_RECIP_INTERFACE,
512 0, iface_no, &ctx->ncm_parm,
513 sizeof(ctx->ncm_parm));
514 if (err < 0) {
515 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
516 return err; /* GET_NTB_PARAMETERS is required */
517 }
518
519 /* set CRC Mode */
520 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
521 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
522 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
523 USB_TYPE_CLASS | USB_DIR_OUT
524 | USB_RECIP_INTERFACE,
525 USB_CDC_NCM_CRC_NOT_APPENDED,
526 iface_no, NULL, 0);
527 if (err < 0)
528 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
529 }
530
531 /* use ndp16 by default */
532 ctx->is_ndp16 = 1;
533
534 /* set NTB format, if both formats are supported.
535 *
536 * "The host shall only send this command while the NCM Data
537 * Interface is in alternate setting 0."
538 */
539 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
540 USB_CDC_NCM_NTB32_SUPPORTED) {
541 if (ctx->drvflags & CDC_NCM_FLAG_PREFER_NTB32) {
542 ctx->is_ndp16 = 0;
543 dev_dbg(&dev->intf->dev, "Setting NTB format to 32-bit\n");
544 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
545 USB_TYPE_CLASS | USB_DIR_OUT
546 | USB_RECIP_INTERFACE,
547 USB_CDC_NCM_NTB32_FORMAT,
548 iface_no, NULL, 0);
549 } else {
550 ctx->is_ndp16 = 1;
551 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
552 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
553 USB_TYPE_CLASS | USB_DIR_OUT
554 | USB_RECIP_INTERFACE,
555 USB_CDC_NCM_NTB16_FORMAT,
556 iface_no, NULL, 0);
557 }
558 if (err < 0) {
559 ctx->is_ndp16 = 1;
560 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
561 }
562 }
563
564 /* set initial device values */
565 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
566 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
567 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
568 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
569 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
570 /* devices prior to NCM Errata shall set this field to zero */
571 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
572
573 dev_dbg(&dev->intf->dev,
574 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
575 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
576 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
577
578 /* max count of tx datagrams */
579 if ((ctx->tx_max_datagrams == 0) ||
580 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
581 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
582
583 /* set up maximum NDP size */
584 if (ctx->is_ndp16)
585 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
586 else
587 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp32) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe32);
588
589 /* initial coalescing timer interval */
590 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
591
592 return 0;
593 }
594
595 /* set a new max datagram size */
cdc_ncm_set_dgram_size(struct usbnet * dev,int new_size)596 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
597 {
598 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
599 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
600 __le16 max_datagram_size;
601 u16 mbim_mtu;
602 int err;
603
604 /* set default based on descriptors */
605 ctx->max_datagram_size = clamp_t(u32, new_size,
606 cdc_ncm_min_dgram_size(dev),
607 CDC_NCM_MAX_DATAGRAM_SIZE);
608
609 /* inform the device about the selected Max Datagram Size? */
610 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
611 goto out;
612
613 /* read current mtu value from device */
614 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
615 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
616 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
617 if (err != sizeof(max_datagram_size)) {
618 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
619 goto out;
620 }
621
622 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
623 goto out;
624
625 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
626 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
627 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
628 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
629 if (err < 0)
630 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
631
632 out:
633 /* set MTU to max supported by the device if necessary */
634 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
635
636 /* do not exceed operater preferred MTU */
637 if (ctx->mbim_extended_desc) {
638 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
639 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
640 dev->net->mtu = mbim_mtu;
641 }
642 }
643
cdc_ncm_fix_modulus(struct usbnet * dev)644 static void cdc_ncm_fix_modulus(struct usbnet *dev)
645 {
646 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
647 u32 val;
648
649 /*
650 * verify that the structure alignment is:
651 * - power of two
652 * - not greater than the maximum transmit length
653 * - not less than four bytes
654 */
655 val = ctx->tx_ndp_modulus;
656
657 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
658 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
659 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
660 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
661 }
662
663 /*
664 * verify that the payload alignment is:
665 * - power of two
666 * - not greater than the maximum transmit length
667 * - not less than four bytes
668 */
669 val = ctx->tx_modulus;
670
671 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
672 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
673 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
674 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
675 }
676
677 /* verify the payload remainder */
678 if (ctx->tx_remainder >= ctx->tx_modulus) {
679 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
680 ctx->tx_remainder = 0;
681 }
682
683 /* adjust TX-remainder according to NCM specification. */
684 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
685 (ctx->tx_modulus - 1));
686 }
687
cdc_ncm_setup(struct usbnet * dev)688 static int cdc_ncm_setup(struct usbnet *dev)
689 {
690 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
691 u32 def_rx, def_tx;
692
693 /* be conservative when selecting intial buffer size to
694 * increase the number of hosts this will work for
695 */
696 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
697 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
698 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
699 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
700
701 /* clamp rx_max and tx_max and inform device */
702 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
703
704 /* sanitize the modulus and remainder values */
705 cdc_ncm_fix_modulus(dev);
706
707 /* set max datagram size */
708 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
709 return 0;
710 }
711
712 static void
cdc_ncm_find_endpoints(struct usbnet * dev,struct usb_interface * intf)713 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
714 {
715 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
716 u8 ep;
717
718 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
719 e = intf->cur_altsetting->endpoint + ep;
720
721 /* ignore endpoints which cannot transfer data */
722 if (!usb_endpoint_maxp(&e->desc))
723 continue;
724
725 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
726 case USB_ENDPOINT_XFER_INT:
727 if (usb_endpoint_dir_in(&e->desc)) {
728 if (!dev->status)
729 dev->status = e;
730 }
731 break;
732
733 case USB_ENDPOINT_XFER_BULK:
734 if (usb_endpoint_dir_in(&e->desc)) {
735 if (!in)
736 in = e;
737 } else {
738 if (!out)
739 out = e;
740 }
741 break;
742
743 default:
744 break;
745 }
746 }
747 if (in && !dev->in)
748 dev->in = usb_rcvbulkpipe(dev->udev,
749 in->desc.bEndpointAddress &
750 USB_ENDPOINT_NUMBER_MASK);
751 if (out && !dev->out)
752 dev->out = usb_sndbulkpipe(dev->udev,
753 out->desc.bEndpointAddress &
754 USB_ENDPOINT_NUMBER_MASK);
755 }
756
cdc_ncm_free(struct cdc_ncm_ctx * ctx)757 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
758 {
759 if (ctx == NULL)
760 return;
761
762 if (ctx->tx_rem_skb != NULL) {
763 dev_kfree_skb_any(ctx->tx_rem_skb);
764 ctx->tx_rem_skb = NULL;
765 }
766
767 if (ctx->tx_curr_skb != NULL) {
768 dev_kfree_skb_any(ctx->tx_curr_skb);
769 ctx->tx_curr_skb = NULL;
770 }
771
772 if (ctx->is_ndp16)
773 kfree(ctx->delayed_ndp16);
774 else
775 kfree(ctx->delayed_ndp32);
776
777 kfree(ctx);
778 }
779
780 /* we need to override the usbnet change_mtu ndo for two reasons:
781 * - respect the negotiated maximum datagram size
782 * - avoid unwanted changes to rx and tx buffers
783 */
cdc_ncm_change_mtu(struct net_device * net,int new_mtu)784 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
785 {
786 struct usbnet *dev = netdev_priv(net);
787
788 net->mtu = new_mtu;
789 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
790
791 return 0;
792 }
793 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
794
795 static const struct net_device_ops cdc_ncm_netdev_ops = {
796 .ndo_open = usbnet_open,
797 .ndo_stop = usbnet_stop,
798 .ndo_start_xmit = usbnet_start_xmit,
799 .ndo_tx_timeout = usbnet_tx_timeout,
800 .ndo_set_rx_mode = usbnet_set_rx_mode,
801 .ndo_get_stats64 = usbnet_get_stats64,
802 .ndo_change_mtu = cdc_ncm_change_mtu,
803 .ndo_set_mac_address = eth_mac_addr,
804 .ndo_validate_addr = eth_validate_addr,
805 };
806
cdc_ncm_bind_common(struct usbnet * dev,struct usb_interface * intf,u8 data_altsetting,int drvflags)807 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
808 {
809 struct cdc_ncm_ctx *ctx;
810 struct usb_driver *driver;
811 u8 *buf;
812 int len;
813 int temp;
814 u8 iface_no;
815 struct usb_cdc_parsed_header hdr;
816
817 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
818 if (!ctx)
819 return -ENOMEM;
820
821 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
822 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
823 tasklet_init(&ctx->bh, cdc_ncm_txpath_bh, (unsigned long)dev);
824 atomic_set(&ctx->stop, 0);
825 spin_lock_init(&ctx->mtx);
826
827 /* store ctx pointer in device data field */
828 dev->data[0] = (unsigned long)ctx;
829
830 /* only the control interface can be successfully probed */
831 ctx->control = intf;
832
833 /* get some pointers */
834 driver = driver_of(intf);
835 buf = intf->cur_altsetting->extra;
836 len = intf->cur_altsetting->extralen;
837
838 /* parse through descriptors associated with control interface */
839 cdc_parse_cdc_header(&hdr, intf, buf, len);
840
841 if (hdr.usb_cdc_union_desc)
842 ctx->data = usb_ifnum_to_if(dev->udev,
843 hdr.usb_cdc_union_desc->bSlaveInterface0);
844 ctx->ether_desc = hdr.usb_cdc_ether_desc;
845 ctx->func_desc = hdr.usb_cdc_ncm_desc;
846 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
847 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
848
849 /* some buggy devices have an IAD but no CDC Union */
850 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
851 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
852 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
853 }
854
855 /* check if we got everything */
856 if (!ctx->data) {
857 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
858 goto error;
859 }
860 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
861 if (!ctx->mbim_desc) {
862 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
863 goto error;
864 }
865 } else {
866 if (!ctx->ether_desc || !ctx->func_desc) {
867 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
868 goto error;
869 }
870 }
871
872 /* claim data interface, if different from control */
873 if (ctx->data != ctx->control) {
874 temp = usb_driver_claim_interface(driver, ctx->data, dev);
875 if (temp) {
876 dev_dbg(&intf->dev, "failed to claim data intf\n");
877 goto error;
878 }
879 }
880
881 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
882
883 /* Device-specific flags */
884 ctx->drvflags = drvflags;
885
886 /* Reset data interface. Some devices will not reset properly
887 * unless they are configured first. Toggle the altsetting to
888 * force a reset.
889 * Some other devices do not work properly with this procedure
890 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
891 */
892 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
893 usb_set_interface(dev->udev, iface_no, data_altsetting);
894
895 temp = usb_set_interface(dev->udev, iface_no, 0);
896 if (temp) {
897 dev_dbg(&intf->dev, "set interface failed\n");
898 goto error2;
899 }
900
901 /* initialize basic device settings */
902 if (cdc_ncm_init(dev))
903 goto error2;
904
905 /* Some firmwares need a pause here or they will silently fail
906 * to set up the interface properly. This value was decided
907 * empirically on a Sierra Wireless MC7455 running 02.08.02.00
908 * firmware.
909 */
910 usleep_range(10000, 20000);
911
912 /* configure data interface */
913 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
914 if (temp) {
915 dev_dbg(&intf->dev, "set interface failed\n");
916 goto error2;
917 }
918
919 cdc_ncm_find_endpoints(dev, ctx->data);
920 cdc_ncm_find_endpoints(dev, ctx->control);
921 if (!dev->in || !dev->out || !dev->status) {
922 dev_dbg(&intf->dev, "failed to collect endpoints\n");
923 goto error2;
924 }
925
926 usb_set_intfdata(ctx->data, dev);
927 usb_set_intfdata(ctx->control, dev);
928
929 if (ctx->ether_desc) {
930 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
931 if (temp) {
932 dev_dbg(&intf->dev, "failed to get mac address\n");
933 goto error2;
934 }
935 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
936 }
937
938 /* finish setting up the device specific data */
939 cdc_ncm_setup(dev);
940
941 /* Allocate the delayed NDP if needed. */
942 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
943 if (ctx->is_ndp16) {
944 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
945 if (!ctx->delayed_ndp16)
946 goto error2;
947 } else {
948 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
949 if (!ctx->delayed_ndp32)
950 goto error2;
951 }
952 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
953 }
954
955 /* override ethtool_ops */
956 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
957
958 /* add our sysfs attrs */
959 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
960
961 /* must handle MTU changes */
962 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
963 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
964
965 return 0;
966
967 error2:
968 usb_set_intfdata(ctx->control, NULL);
969 usb_set_intfdata(ctx->data, NULL);
970 if (ctx->data != ctx->control)
971 usb_driver_release_interface(driver, ctx->data);
972 error:
973 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
974 dev->data[0] = 0;
975 dev_info(&intf->dev, "bind() failure\n");
976 return -ENODEV;
977 }
978 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
979
cdc_ncm_unbind(struct usbnet * dev,struct usb_interface * intf)980 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
981 {
982 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
983 struct usb_driver *driver = driver_of(intf);
984
985 if (ctx == NULL)
986 return; /* no setup */
987
988 atomic_set(&ctx->stop, 1);
989
990 hrtimer_cancel(&ctx->tx_timer);
991
992 tasklet_kill(&ctx->bh);
993
994 /* handle devices with combined control and data interface */
995 if (ctx->control == ctx->data)
996 ctx->data = NULL;
997
998 /* disconnect master --> disconnect slave */
999 if (intf == ctx->control && ctx->data) {
1000 usb_set_intfdata(ctx->data, NULL);
1001 usb_driver_release_interface(driver, ctx->data);
1002 ctx->data = NULL;
1003
1004 } else if (intf == ctx->data && ctx->control) {
1005 usb_set_intfdata(ctx->control, NULL);
1006 usb_driver_release_interface(driver, ctx->control);
1007 ctx->control = NULL;
1008 }
1009
1010 usb_set_intfdata(intf, NULL);
1011 cdc_ncm_free(ctx);
1012 }
1013 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
1014
1015 /* Return the number of the MBIM control interface altsetting iff it
1016 * is preferred and available,
1017 */
cdc_ncm_select_altsetting(struct usb_interface * intf)1018 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1019 {
1020 struct usb_host_interface *alt;
1021
1022 /* The MBIM spec defines a NCM compatible default altsetting,
1023 * which we may have matched:
1024 *
1025 * "Functions that implement both NCM 1.0 and MBIM (an
1026 * “NCM/MBIM function”) according to this recommendation
1027 * shall provide two alternate settings for the
1028 * Communication Interface. Alternate setting 0, and the
1029 * associated class and endpoint descriptors, shall be
1030 * constructed according to the rules given for the
1031 * Communication Interface in section 5 of [USBNCM10].
1032 * Alternate setting 1, and the associated class and
1033 * endpoint descriptors, shall be constructed according to
1034 * the rules given in section 6 (USB Device Model) of this
1035 * specification."
1036 */
1037 if (intf->num_altsetting < 2)
1038 return intf->cur_altsetting->desc.bAlternateSetting;
1039
1040 if (prefer_mbim) {
1041 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1042 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1043 return CDC_NCM_COMM_ALTSETTING_MBIM;
1044 }
1045 return CDC_NCM_COMM_ALTSETTING_NCM;
1046 }
1047 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1048
cdc_ncm_bind(struct usbnet * dev,struct usb_interface * intf)1049 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1050 {
1051 /* MBIM backwards compatible function? */
1052 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1053 return -ENODEV;
1054
1055 /* The NCM data altsetting is fixed, so we hard-coded it.
1056 * Additionally, generic NCM devices are assumed to accept arbitrarily
1057 * placed NDP.
1058 */
1059 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1060 }
1061
cdc_ncm_align_tail(struct sk_buff * skb,size_t modulus,size_t remainder,size_t max)1062 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1063 {
1064 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1065
1066 if (skb->len + align > max)
1067 align = max - skb->len;
1068 if (align && skb_tailroom(skb) >= align)
1069 skb_put_zero(skb, align);
1070 }
1071
1072 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1073 * allocating a new one within skb
1074 */
cdc_ncm_ndp16(struct cdc_ncm_ctx * ctx,struct sk_buff * skb,__le32 sign,size_t reserve)1075 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1076 {
1077 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1078 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1079 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1080
1081 /* If NDP should be moved to the end of the NCM package, we can't follow the
1082 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1083 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1084 */
1085 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1086 if (ctx->delayed_ndp16->dwSignature == sign)
1087 return ctx->delayed_ndp16;
1088
1089 /* We can only push a single NDP to the end. Return
1090 * NULL to send what we've already got and queue this
1091 * skb for later.
1092 */
1093 else if (ctx->delayed_ndp16->dwSignature)
1094 return NULL;
1095 }
1096
1097 /* follow the chain of NDPs, looking for a match */
1098 while (ndpoffset) {
1099 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1100 if (ndp16->dwSignature == sign)
1101 return ndp16;
1102 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1103 }
1104
1105 /* align new NDP */
1106 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1107 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1108
1109 /* verify that there is room for the NDP and the datagram (reserve) */
1110 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1111 return NULL;
1112
1113 /* link to it */
1114 if (ndp16)
1115 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1116 else
1117 nth16->wNdpIndex = cpu_to_le16(skb->len);
1118
1119 /* push a new empty NDP */
1120 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1121 ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1122 else
1123 ndp16 = ctx->delayed_ndp16;
1124
1125 ndp16->dwSignature = sign;
1126 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1127 return ndp16;
1128 }
1129
cdc_ncm_ndp32(struct cdc_ncm_ctx * ctx,struct sk_buff * skb,__le32 sign,size_t reserve)1130 static struct usb_cdc_ncm_ndp32 *cdc_ncm_ndp32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1131 {
1132 struct usb_cdc_ncm_ndp32 *ndp32 = NULL;
1133 struct usb_cdc_ncm_nth32 *nth32 = (void *)skb->data;
1134 size_t ndpoffset = le32_to_cpu(nth32->dwNdpIndex);
1135
1136 /* If NDP should be moved to the end of the NCM package, we can't follow the
1137 * NTH32 header as we would normally do. NDP isn't written to the SKB yet, and
1138 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1139 */
1140 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1141 if (ctx->delayed_ndp32->dwSignature == sign)
1142 return ctx->delayed_ndp32;
1143
1144 /* We can only push a single NDP to the end. Return
1145 * NULL to send what we've already got and queue this
1146 * skb for later.
1147 */
1148 else if (ctx->delayed_ndp32->dwSignature)
1149 return NULL;
1150 }
1151
1152 /* follow the chain of NDPs, looking for a match */
1153 while (ndpoffset) {
1154 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb->data + ndpoffset);
1155 if (ndp32->dwSignature == sign)
1156 return ndp32;
1157 ndpoffset = le32_to_cpu(ndp32->dwNextNdpIndex);
1158 }
1159
1160 /* align new NDP */
1161 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1162 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1163
1164 /* verify that there is room for the NDP and the datagram (reserve) */
1165 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1166 return NULL;
1167
1168 /* link to it */
1169 if (ndp32)
1170 ndp32->dwNextNdpIndex = cpu_to_le32(skb->len);
1171 else
1172 nth32->dwNdpIndex = cpu_to_le32(skb->len);
1173
1174 /* push a new empty NDP */
1175 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1176 ndp32 = skb_put_zero(skb, ctx->max_ndp_size);
1177 else
1178 ndp32 = ctx->delayed_ndp32;
1179
1180 ndp32->dwSignature = sign;
1181 ndp32->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32));
1182 return ndp32;
1183 }
1184
1185 struct sk_buff *
cdc_ncm_fill_tx_frame(struct usbnet * dev,struct sk_buff * skb,__le32 sign)1186 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1187 {
1188 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1189 union {
1190 struct usb_cdc_ncm_nth16 *nth16;
1191 struct usb_cdc_ncm_nth32 *nth32;
1192 } nth;
1193 union {
1194 struct usb_cdc_ncm_ndp16 *ndp16;
1195 struct usb_cdc_ncm_ndp32 *ndp32;
1196 } ndp;
1197 struct sk_buff *skb_out;
1198 u16 n = 0, index, ndplen;
1199 u8 ready2send = 0;
1200 u32 delayed_ndp_size;
1201 size_t padding_count;
1202
1203 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1204 * accordingly. Otherwise, we should check here.
1205 */
1206 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1207 delayed_ndp_size = ctx->max_ndp_size +
1208 max_t(u32,
1209 ctx->tx_ndp_modulus,
1210 ctx->tx_modulus + ctx->tx_remainder) - 1;
1211 else
1212 delayed_ndp_size = 0;
1213
1214 /* if there is a remaining skb, it gets priority */
1215 if (skb != NULL) {
1216 swap(skb, ctx->tx_rem_skb);
1217 swap(sign, ctx->tx_rem_sign);
1218 } else {
1219 ready2send = 1;
1220 }
1221
1222 /* check if we are resuming an OUT skb */
1223 skb_out = ctx->tx_curr_skb;
1224
1225 /* allocate a new OUT skb */
1226 if (!skb_out) {
1227 if (ctx->tx_low_mem_val == 0) {
1228 ctx->tx_curr_size = ctx->tx_max;
1229 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1230 /* If the memory allocation fails we will wait longer
1231 * each time before attempting another full size
1232 * allocation again to not overload the system
1233 * further.
1234 */
1235 if (skb_out == NULL) {
1236 /* If even the smallest allocation fails, abort. */
1237 if (ctx->tx_curr_size == USB_CDC_NCM_NTB_MIN_OUT_SIZE)
1238 goto alloc_failed;
1239 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1240 (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1241 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1242 }
1243 }
1244 if (skb_out == NULL) {
1245 /* See if a very small allocation is possible.
1246 * We will send this packet immediately and hope
1247 * that there is more memory available later.
1248 */
1249 if (skb)
1250 ctx->tx_curr_size = max(skb->len,
1251 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1252 else
1253 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1254 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1255
1256 /* No allocation possible so we will abort */
1257 if (!skb_out)
1258 goto alloc_failed;
1259 ctx->tx_low_mem_val--;
1260 }
1261 if (ctx->is_ndp16) {
1262 /* fill out the initial 16-bit NTB header */
1263 nth.nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1264 nth.nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1265 nth.nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1266 nth.nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1267 } else {
1268 /* fill out the initial 32-bit NTB header */
1269 nth.nth32 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth32));
1270 nth.nth32->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH32_SIGN);
1271 nth.nth32->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth32));
1272 nth.nth32->wSequence = cpu_to_le16(ctx->tx_seq++);
1273 }
1274
1275 /* count total number of frames in this NTB */
1276 ctx->tx_curr_frame_num = 0;
1277
1278 /* recent payload counter for this skb_out */
1279 ctx->tx_curr_frame_payload = 0;
1280 }
1281
1282 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1283 /* send any remaining skb first */
1284 if (skb == NULL) {
1285 skb = ctx->tx_rem_skb;
1286 sign = ctx->tx_rem_sign;
1287 ctx->tx_rem_skb = NULL;
1288
1289 /* check for end of skb */
1290 if (skb == NULL)
1291 break;
1292 }
1293
1294 /* get the appropriate NDP for this skb */
1295 if (ctx->is_ndp16)
1296 ndp.ndp16 = cdc_ncm_ndp16(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1297 else
1298 ndp.ndp32 = cdc_ncm_ndp32(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1299
1300 /* align beginning of next frame */
1301 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1302
1303 /* check if we had enough room left for both NDP and frame */
1304 if ((ctx->is_ndp16 && !ndp.ndp16) || (!ctx->is_ndp16 && !ndp.ndp32) ||
1305 skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1306 if (n == 0) {
1307 /* won't fit, MTU problem? */
1308 dev_kfree_skb_any(skb);
1309 skb = NULL;
1310 dev->net->stats.tx_dropped++;
1311 } else {
1312 /* no room for skb - store for later */
1313 if (ctx->tx_rem_skb != NULL) {
1314 dev_kfree_skb_any(ctx->tx_rem_skb);
1315 dev->net->stats.tx_dropped++;
1316 }
1317 ctx->tx_rem_skb = skb;
1318 ctx->tx_rem_sign = sign;
1319 skb = NULL;
1320 ready2send = 1;
1321 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1322 }
1323 break;
1324 }
1325
1326 /* calculate frame number withing this NDP */
1327 if (ctx->is_ndp16) {
1328 ndplen = le16_to_cpu(ndp.ndp16->wLength);
1329 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1330
1331 /* OK, add this skb */
1332 ndp.ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1333 ndp.ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1334 ndp.ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1335 } else {
1336 ndplen = le16_to_cpu(ndp.ndp32->wLength);
1337 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp32)) / sizeof(struct usb_cdc_ncm_dpe32) - 1;
1338
1339 ndp.ndp32->dpe32[index].dwDatagramLength = cpu_to_le32(skb->len);
1340 ndp.ndp32->dpe32[index].dwDatagramIndex = cpu_to_le32(skb_out->len);
1341 ndp.ndp32->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe32));
1342 }
1343 skb_put_data(skb_out, skb->data, skb->len);
1344 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1345 dev_kfree_skb_any(skb);
1346 skb = NULL;
1347
1348 /* send now if this NDP is full */
1349 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1350 ready2send = 1;
1351 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1352 break;
1353 }
1354 }
1355
1356 /* free up any dangling skb */
1357 if (skb != NULL) {
1358 dev_kfree_skb_any(skb);
1359 skb = NULL;
1360 dev->net->stats.tx_dropped++;
1361 }
1362
1363 ctx->tx_curr_frame_num = n;
1364
1365 if (n == 0) {
1366 /* wait for more frames */
1367 /* push variables */
1368 ctx->tx_curr_skb = skb_out;
1369 goto exit_no_skb;
1370
1371 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1372 /* wait for more frames */
1373 /* push variables */
1374 ctx->tx_curr_skb = skb_out;
1375 /* set the pending count */
1376 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1377 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1378 goto exit_no_skb;
1379
1380 } else {
1381 if (n == ctx->tx_max_datagrams)
1382 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1383 /* frame goes out */
1384 /* variables will be reset at next call */
1385 }
1386
1387 /* If requested, put NDP at end of frame. */
1388 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1389 if (ctx->is_ndp16) {
1390 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1391 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1392 nth.nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1393 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1394
1395 /* Zero out delayed NDP - signature checking will naturally fail. */
1396 ndp.ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1397 } else {
1398 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1399 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1400 nth.nth32->dwNdpIndex = cpu_to_le32(skb_out->len);
1401 skb_put_data(skb_out, ctx->delayed_ndp32, ctx->max_ndp_size);
1402
1403 ndp.ndp32 = memset(ctx->delayed_ndp32, 0, ctx->max_ndp_size);
1404 }
1405 }
1406
1407 /* If collected data size is less or equal ctx->min_tx_pkt
1408 * bytes, we send buffers as it is. If we get more data, it
1409 * would be more efficient for USB HS mobile device with DMA
1410 * engine to receive a full size NTB, than canceling DMA
1411 * transfer and receiving a short packet.
1412 *
1413 * This optimization support is pointless if we end up sending
1414 * a ZLP after full sized NTBs.
1415 */
1416 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1417 skb_out->len > ctx->min_tx_pkt) {
1418 padding_count = ctx->tx_curr_size - skb_out->len;
1419 if (!WARN_ON(padding_count > ctx->tx_curr_size))
1420 skb_put_zero(skb_out, padding_count);
1421 } else if (skb_out->len < ctx->tx_curr_size &&
1422 (skb_out->len % dev->maxpacket) == 0) {
1423 skb_put_u8(skb_out, 0); /* force short packet */
1424 }
1425
1426 /* set final frame length */
1427 if (ctx->is_ndp16) {
1428 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1429 nth.nth16->wBlockLength = cpu_to_le16(skb_out->len);
1430 } else {
1431 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1432 nth.nth32->dwBlockLength = cpu_to_le32(skb_out->len);
1433 }
1434
1435 /* return skb */
1436 ctx->tx_curr_skb = NULL;
1437
1438 /* keep private stats: framing overhead and number of NTBs */
1439 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1440 ctx->tx_ntbs++;
1441
1442 /* usbnet will count all the framing overhead by default.
1443 * Adjust the stats so that the tx_bytes counter show real
1444 * payload data instead.
1445 */
1446 usbnet_set_skb_tx_stats(skb_out, n,
1447 (long)ctx->tx_curr_frame_payload - skb_out->len);
1448
1449 return skb_out;
1450
1451 alloc_failed:
1452 if (skb) {
1453 dev_kfree_skb_any(skb);
1454 dev->net->stats.tx_dropped++;
1455 }
1456 exit_no_skb:
1457 /* Start timer, if there is a remaining non-empty skb */
1458 if (ctx->tx_curr_skb != NULL && n > 0)
1459 cdc_ncm_tx_timeout_start(ctx);
1460 return NULL;
1461 }
1462 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1463
cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx * ctx)1464 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1465 {
1466 /* start timer, if not already started */
1467 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1468 hrtimer_start(&ctx->tx_timer,
1469 ctx->timer_interval,
1470 HRTIMER_MODE_REL);
1471 }
1472
cdc_ncm_tx_timer_cb(struct hrtimer * timer)1473 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1474 {
1475 struct cdc_ncm_ctx *ctx =
1476 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1477
1478 if (!atomic_read(&ctx->stop))
1479 tasklet_schedule(&ctx->bh);
1480 return HRTIMER_NORESTART;
1481 }
1482
cdc_ncm_txpath_bh(unsigned long param)1483 static void cdc_ncm_txpath_bh(unsigned long param)
1484 {
1485 struct usbnet *dev = (struct usbnet *)param;
1486 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1487
1488 spin_lock_bh(&ctx->mtx);
1489 if (ctx->tx_timer_pending != 0) {
1490 ctx->tx_timer_pending--;
1491 cdc_ncm_tx_timeout_start(ctx);
1492 spin_unlock_bh(&ctx->mtx);
1493 } else if (dev->net != NULL) {
1494 ctx->tx_reason_timeout++; /* count reason for transmitting */
1495 spin_unlock_bh(&ctx->mtx);
1496 netif_tx_lock_bh(dev->net);
1497 usbnet_start_xmit(NULL, dev->net);
1498 netif_tx_unlock_bh(dev->net);
1499 } else {
1500 spin_unlock_bh(&ctx->mtx);
1501 }
1502 }
1503
1504 struct sk_buff *
cdc_ncm_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)1505 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1506 {
1507 struct sk_buff *skb_out;
1508 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1509
1510 /*
1511 * The Ethernet API we are using does not support transmitting
1512 * multiple Ethernet frames in a single call. This driver will
1513 * accumulate multiple Ethernet frames and send out a larger
1514 * USB frame when the USB buffer is full or when a single jiffies
1515 * timeout happens.
1516 */
1517 if (ctx == NULL)
1518 goto error;
1519
1520 spin_lock_bh(&ctx->mtx);
1521
1522 if (ctx->is_ndp16)
1523 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1524 else
1525 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN));
1526
1527 spin_unlock_bh(&ctx->mtx);
1528 return skb_out;
1529
1530 error:
1531 if (skb != NULL)
1532 dev_kfree_skb_any(skb);
1533
1534 return NULL;
1535 }
1536 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1537
1538 /* verify NTB header and return offset of first NDP, or negative error */
cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx * ctx,struct sk_buff * skb_in)1539 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1540 {
1541 struct usbnet *dev = netdev_priv(skb_in->dev);
1542 struct usb_cdc_ncm_nth16 *nth16;
1543 int len;
1544 int ret = -EINVAL;
1545
1546 if (ctx == NULL)
1547 goto error;
1548
1549 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1550 sizeof(struct usb_cdc_ncm_ndp16))) {
1551 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1552 goto error;
1553 }
1554
1555 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1556
1557 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1558 netif_dbg(dev, rx_err, dev->net,
1559 "invalid NTH16 signature <%#010x>\n",
1560 le32_to_cpu(nth16->dwSignature));
1561 goto error;
1562 }
1563
1564 len = le16_to_cpu(nth16->wBlockLength);
1565 if (len > ctx->rx_max) {
1566 netif_dbg(dev, rx_err, dev->net,
1567 "unsupported NTB block length %u/%u\n", len,
1568 ctx->rx_max);
1569 goto error;
1570 }
1571
1572 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1573 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1574 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1575 netif_dbg(dev, rx_err, dev->net,
1576 "sequence number glitch prev=%d curr=%d\n",
1577 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1578 }
1579 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1580
1581 ret = le16_to_cpu(nth16->wNdpIndex);
1582 error:
1583 return ret;
1584 }
1585 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1586
cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx * ctx,struct sk_buff * skb_in)1587 int cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1588 {
1589 struct usbnet *dev = netdev_priv(skb_in->dev);
1590 struct usb_cdc_ncm_nth32 *nth32;
1591 int len;
1592 int ret = -EINVAL;
1593
1594 if (ctx == NULL)
1595 goto error;
1596
1597 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth32) +
1598 sizeof(struct usb_cdc_ncm_ndp32))) {
1599 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1600 goto error;
1601 }
1602
1603 nth32 = (struct usb_cdc_ncm_nth32 *)skb_in->data;
1604
1605 if (nth32->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH32_SIGN)) {
1606 netif_dbg(dev, rx_err, dev->net,
1607 "invalid NTH32 signature <%#010x>\n",
1608 le32_to_cpu(nth32->dwSignature));
1609 goto error;
1610 }
1611
1612 len = le32_to_cpu(nth32->dwBlockLength);
1613 if (len > ctx->rx_max) {
1614 netif_dbg(dev, rx_err, dev->net,
1615 "unsupported NTB block length %u/%u\n", len,
1616 ctx->rx_max);
1617 goto error;
1618 }
1619
1620 if ((ctx->rx_seq + 1) != le16_to_cpu(nth32->wSequence) &&
1621 (ctx->rx_seq || le16_to_cpu(nth32->wSequence)) &&
1622 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth32->wSequence))) {
1623 netif_dbg(dev, rx_err, dev->net,
1624 "sequence number glitch prev=%d curr=%d\n",
1625 ctx->rx_seq, le16_to_cpu(nth32->wSequence));
1626 }
1627 ctx->rx_seq = le16_to_cpu(nth32->wSequence);
1628
1629 ret = le32_to_cpu(nth32->dwNdpIndex);
1630 error:
1631 return ret;
1632 }
1633 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth32);
1634
1635 /* verify NDP header and return number of datagrams, or negative error */
cdc_ncm_rx_verify_ndp16(struct sk_buff * skb_in,int ndpoffset)1636 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1637 {
1638 struct usbnet *dev = netdev_priv(skb_in->dev);
1639 struct usb_cdc_ncm_ndp16 *ndp16;
1640 int ret = -EINVAL;
1641
1642 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1643 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1644 ndpoffset);
1645 goto error;
1646 }
1647 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1648
1649 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1650 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1651 le16_to_cpu(ndp16->wLength));
1652 goto error;
1653 }
1654
1655 ret = ((le16_to_cpu(ndp16->wLength) -
1656 sizeof(struct usb_cdc_ncm_ndp16)) /
1657 sizeof(struct usb_cdc_ncm_dpe16));
1658 ret--; /* we process NDP entries except for the last one */
1659
1660 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1661 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1662 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1663 ret = -EINVAL;
1664 }
1665
1666 error:
1667 return ret;
1668 }
1669 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1670
1671 /* verify NDP header and return number of datagrams, or negative error */
cdc_ncm_rx_verify_ndp32(struct sk_buff * skb_in,int ndpoffset)1672 int cdc_ncm_rx_verify_ndp32(struct sk_buff *skb_in, int ndpoffset)
1673 {
1674 struct usbnet *dev = netdev_priv(skb_in->dev);
1675 struct usb_cdc_ncm_ndp32 *ndp32;
1676 int ret = -EINVAL;
1677
1678 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp32)) > skb_in->len) {
1679 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1680 ndpoffset);
1681 goto error;
1682 }
1683 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1684
1685 if (le16_to_cpu(ndp32->wLength) < USB_CDC_NCM_NDP32_LENGTH_MIN) {
1686 netif_dbg(dev, rx_err, dev->net, "invalid DPT32 length <%u>\n",
1687 le16_to_cpu(ndp32->wLength));
1688 goto error;
1689 }
1690
1691 ret = ((le16_to_cpu(ndp32->wLength) -
1692 sizeof(struct usb_cdc_ncm_ndp32)) /
1693 sizeof(struct usb_cdc_ncm_dpe32));
1694 ret--; /* we process NDP entries except for the last one */
1695
1696 if ((sizeof(struct usb_cdc_ncm_ndp32) +
1697 ret * (sizeof(struct usb_cdc_ncm_dpe32))) > skb_in->len) {
1698 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1699 ret = -EINVAL;
1700 }
1701
1702 error:
1703 return ret;
1704 }
1705 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp32);
1706
cdc_ncm_rx_fixup(struct usbnet * dev,struct sk_buff * skb_in)1707 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1708 {
1709 struct sk_buff *skb;
1710 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1711 unsigned int len;
1712 int nframes;
1713 int x;
1714 unsigned int offset;
1715 union {
1716 struct usb_cdc_ncm_ndp16 *ndp16;
1717 struct usb_cdc_ncm_ndp32 *ndp32;
1718 } ndp;
1719 union {
1720 struct usb_cdc_ncm_dpe16 *dpe16;
1721 struct usb_cdc_ncm_dpe32 *dpe32;
1722 } dpe;
1723
1724 int ndpoffset;
1725 int loopcount = 50; /* arbitrary max preventing infinite loop */
1726 u32 payload = 0;
1727
1728 if (ctx->is_ndp16)
1729 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1730 else
1731 ndpoffset = cdc_ncm_rx_verify_nth32(ctx, skb_in);
1732
1733 if (ndpoffset < 0)
1734 goto error;
1735
1736 next_ndp:
1737 if (ctx->is_ndp16) {
1738 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1739 if (nframes < 0)
1740 goto error;
1741
1742 ndp.ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1743
1744 if (ndp.ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1745 netif_dbg(dev, rx_err, dev->net,
1746 "invalid DPT16 signature <%#010x>\n",
1747 le32_to_cpu(ndp.ndp16->dwSignature));
1748 goto err_ndp;
1749 }
1750 dpe.dpe16 = ndp.ndp16->dpe16;
1751 } else {
1752 nframes = cdc_ncm_rx_verify_ndp32(skb_in, ndpoffset);
1753 if (nframes < 0)
1754 goto error;
1755
1756 ndp.ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1757
1758 if (ndp.ndp32->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN)) {
1759 netif_dbg(dev, rx_err, dev->net,
1760 "invalid DPT32 signature <%#010x>\n",
1761 le32_to_cpu(ndp.ndp32->dwSignature));
1762 goto err_ndp;
1763 }
1764 dpe.dpe32 = ndp.ndp32->dpe32;
1765 }
1766
1767 for (x = 0; x < nframes; x++) {
1768 if (ctx->is_ndp16) {
1769 offset = le16_to_cpu(dpe.dpe16->wDatagramIndex);
1770 len = le16_to_cpu(dpe.dpe16->wDatagramLength);
1771 } else {
1772 offset = le32_to_cpu(dpe.dpe32->dwDatagramIndex);
1773 len = le32_to_cpu(dpe.dpe32->dwDatagramLength);
1774 }
1775
1776 /*
1777 * CDC NCM ch. 3.7
1778 * All entries after first NULL entry are to be ignored
1779 */
1780 if ((offset == 0) || (len == 0)) {
1781 if (!x)
1782 goto err_ndp; /* empty NTB */
1783 break;
1784 }
1785
1786 /* sanity checking - watch out for integer wrap*/
1787 if ((offset > skb_in->len) || (len > skb_in->len - offset) ||
1788 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1789 netif_dbg(dev, rx_err, dev->net,
1790 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1791 x, offset, len, skb_in);
1792 if (!x)
1793 goto err_ndp;
1794 break;
1795
1796 } else {
1797 /* create a fresh copy to reduce truesize */
1798 skb = netdev_alloc_skb_ip_align(dev->net, len);
1799 if (!skb)
1800 goto error;
1801 skb_put_data(skb, skb_in->data + offset, len);
1802 usbnet_skb_return(dev, skb);
1803 payload += len; /* count payload bytes in this NTB */
1804 }
1805
1806 if (ctx->is_ndp16)
1807 dpe.dpe16++;
1808 else
1809 dpe.dpe32++;
1810 }
1811 err_ndp:
1812 /* are there more NDPs to process? */
1813 if (ctx->is_ndp16)
1814 ndpoffset = le16_to_cpu(ndp.ndp16->wNextNdpIndex);
1815 else
1816 ndpoffset = le32_to_cpu(ndp.ndp32->dwNextNdpIndex);
1817
1818 if (ndpoffset && loopcount--)
1819 goto next_ndp;
1820
1821 /* update stats */
1822 ctx->rx_overhead += skb_in->len - payload;
1823 ctx->rx_ntbs++;
1824
1825 return 1;
1826 error:
1827 return 0;
1828 }
1829 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1830
1831 static void
cdc_ncm_speed_change(struct usbnet * dev,struct usb_cdc_speed_change * data)1832 cdc_ncm_speed_change(struct usbnet *dev,
1833 struct usb_cdc_speed_change *data)
1834 {
1835 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1836 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1837
1838 /*
1839 * Currently the USB-NET API does not support reporting the actual
1840 * device speed. Do print it instead.
1841 */
1842 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1843 netif_info(dev, link, dev->net,
1844 "%u mbit/s downlink %u mbit/s uplink\n",
1845 (unsigned int)(rx_speed / 1000000U),
1846 (unsigned int)(tx_speed / 1000000U));
1847 } else {
1848 netif_info(dev, link, dev->net,
1849 "%u kbit/s downlink %u kbit/s uplink\n",
1850 (unsigned int)(rx_speed / 1000U),
1851 (unsigned int)(tx_speed / 1000U));
1852 }
1853 }
1854
cdc_ncm_status(struct usbnet * dev,struct urb * urb)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 usbnet_link_change(dev, !!event->wValue, 0);
1879 break;
1880
1881 case USB_CDC_NOTIFY_SPEED_CHANGE:
1882 if (urb->actual_length < (sizeof(*event) +
1883 sizeof(struct usb_cdc_speed_change)))
1884 set_bit(EVENT_STS_SPLIT, &dev->flags);
1885 else
1886 cdc_ncm_speed_change(dev,
1887 (struct usb_cdc_speed_change *)&event[1]);
1888 break;
1889
1890 default:
1891 dev_dbg(&dev->udev->dev,
1892 "NCM: unexpected notification 0x%02x!\n",
1893 event->bNotificationType);
1894 break;
1895 }
1896 }
1897
1898 static const struct driver_info cdc_ncm_info = {
1899 .description = "CDC NCM",
1900 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1901 | FLAG_LINK_INTR | FLAG_ETHER,
1902 .bind = cdc_ncm_bind,
1903 .unbind = cdc_ncm_unbind,
1904 .manage_power = usbnet_manage_power,
1905 .status = cdc_ncm_status,
1906 .rx_fixup = cdc_ncm_rx_fixup,
1907 .tx_fixup = cdc_ncm_tx_fixup,
1908 .set_rx_mode = usbnet_cdc_update_filter,
1909 };
1910
1911 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1912 static const struct driver_info wwan_info = {
1913 .description = "Mobile Broadband Network Device",
1914 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1915 | FLAG_LINK_INTR | FLAG_WWAN,
1916 .bind = cdc_ncm_bind,
1917 .unbind = cdc_ncm_unbind,
1918 .manage_power = usbnet_manage_power,
1919 .status = cdc_ncm_status,
1920 .rx_fixup = cdc_ncm_rx_fixup,
1921 .tx_fixup = cdc_ncm_tx_fixup,
1922 .set_rx_mode = usbnet_cdc_update_filter,
1923 };
1924
1925 /* Same as wwan_info, but with FLAG_NOARP */
1926 static const struct driver_info wwan_noarp_info = {
1927 .description = "Mobile Broadband Network Device (NO ARP)",
1928 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1929 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1930 .bind = cdc_ncm_bind,
1931 .unbind = cdc_ncm_unbind,
1932 .manage_power = usbnet_manage_power,
1933 .status = cdc_ncm_status,
1934 .rx_fixup = cdc_ncm_rx_fixup,
1935 .tx_fixup = cdc_ncm_tx_fixup,
1936 .set_rx_mode = usbnet_cdc_update_filter,
1937 };
1938
1939 static const struct usb_device_id cdc_devs[] = {
1940 /* Ericsson MBM devices like F5521gw */
1941 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1942 | USB_DEVICE_ID_MATCH_VENDOR,
1943 .idVendor = 0x0bdb,
1944 .bInterfaceClass = USB_CLASS_COMM,
1945 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1946 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1947 .driver_info = (unsigned long) &wwan_info,
1948 },
1949
1950 /* Telit LE910 V2 */
1951 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1952 USB_CLASS_COMM,
1953 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1954 .driver_info = (unsigned long)&wwan_noarp_info,
1955 },
1956
1957 /* DW5812 LTE Verizon Mobile Broadband Card
1958 * Unlike DW5550 this device requires FLAG_NOARP
1959 */
1960 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1961 USB_CLASS_COMM,
1962 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1963 .driver_info = (unsigned long)&wwan_noarp_info,
1964 },
1965
1966 /* DW5813 LTE AT&T Mobile Broadband Card
1967 * Unlike DW5550 this device requires FLAG_NOARP
1968 */
1969 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1970 USB_CLASS_COMM,
1971 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1972 .driver_info = (unsigned long)&wwan_noarp_info,
1973 },
1974
1975 /* Dell branded MBM devices like DW5550 */
1976 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1977 | USB_DEVICE_ID_MATCH_VENDOR,
1978 .idVendor = 0x413c,
1979 .bInterfaceClass = USB_CLASS_COMM,
1980 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1981 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1982 .driver_info = (unsigned long) &wwan_info,
1983 },
1984
1985 /* Toshiba branded MBM devices */
1986 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1987 | USB_DEVICE_ID_MATCH_VENDOR,
1988 .idVendor = 0x0930,
1989 .bInterfaceClass = USB_CLASS_COMM,
1990 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1991 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1992 .driver_info = (unsigned long) &wwan_info,
1993 },
1994
1995 /* tag Huawei devices as wwan */
1996 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1997 USB_CLASS_COMM,
1998 USB_CDC_SUBCLASS_NCM,
1999 USB_CDC_PROTO_NONE),
2000 .driver_info = (unsigned long)&wwan_info,
2001 },
2002
2003 /* Infineon(now Intel) HSPA Modem platform */
2004 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
2005 USB_CLASS_COMM,
2006 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2007 .driver_info = (unsigned long)&wwan_noarp_info,
2008 },
2009
2010 /* u-blox TOBY-L4 */
2011 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
2012 USB_CLASS_COMM,
2013 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2014 .driver_info = (unsigned long)&wwan_info,
2015 },
2016
2017 /* Generic CDC-NCM devices */
2018 { USB_INTERFACE_INFO(USB_CLASS_COMM,
2019 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2020 .driver_info = (unsigned long)&cdc_ncm_info,
2021 },
2022 {
2023 },
2024 };
2025 MODULE_DEVICE_TABLE(usb, cdc_devs);
2026
2027 static struct usb_driver cdc_ncm_driver = {
2028 .name = "cdc_ncm",
2029 .id_table = cdc_devs,
2030 .probe = usbnet_probe,
2031 .disconnect = usbnet_disconnect,
2032 .suspend = usbnet_suspend,
2033 .resume = usbnet_resume,
2034 .reset_resume = usbnet_resume,
2035 .supports_autosuspend = 1,
2036 .disable_hub_initiated_lpm = 1,
2037 };
2038
2039 module_usb_driver(cdc_ncm_driver);
2040
2041 MODULE_AUTHOR("Hans Petter Selasky");
2042 MODULE_DESCRIPTION("USB CDC NCM host driver");
2043 MODULE_LICENSE("Dual BSD/GPL");
2044