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