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Linux/drivers/net/usb/cdc_ncm.c

  1 /*
  2  * cdc_ncm.c
  3  *
  4  * Copyright (C) ST-Ericsson 2010-2012
  5  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
  6  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
  7  *
  8  * USB Host Driver for Network Control Model (NCM)
  9  * http://www.usb.org/developers/devclass_docs/NCM10.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/ethtool.h>
 45 #include <linux/workqueue.h>
 46 #include <linux/mii.h>
 47 #include <linux/crc32.h>
 48 #include <linux/usb.h>
 49 #include <linux/hrtimer.h>
 50 #include <linux/atomic.h>
 51 #include <linux/usb/usbnet.h>
 52 #include <linux/usb/cdc.h>
 53 #include <linux/usb/cdc_ncm.h>
 54 
 55 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
 56 static bool prefer_mbim = true;
 57 #else
 58 static bool prefer_mbim;
 59 #endif
 60 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
 61 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
 62 
 63 static void cdc_ncm_txpath_bh(unsigned long param);
 64 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
 65 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
 66 static struct usb_driver cdc_ncm_driver;
 67 
 68 struct cdc_ncm_stats {
 69         char stat_string[ETH_GSTRING_LEN];
 70         int sizeof_stat;
 71         int stat_offset;
 72 };
 73 
 74 #define CDC_NCM_STAT(str, m) { \
 75                 .stat_string = str, \
 76                 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
 77                 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
 78 #define CDC_NCM_SIMPLE_STAT(m)  CDC_NCM_STAT(__stringify(m), m)
 79 
 80 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
 81         CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
 82         CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
 83         CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
 84         CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
 85         CDC_NCM_SIMPLE_STAT(tx_overhead),
 86         CDC_NCM_SIMPLE_STAT(tx_ntbs),
 87         CDC_NCM_SIMPLE_STAT(rx_overhead),
 88         CDC_NCM_SIMPLE_STAT(rx_ntbs),
 89 };
 90 
 91 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
 92 {
 93         switch (sset) {
 94         case ETH_SS_STATS:
 95                 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
 96         default:
 97                 return -EOPNOTSUPP;
 98         }
 99 }
100 
101 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
102                                     struct ethtool_stats __always_unused *stats,
103                                     u64 *data)
104 {
105         struct usbnet *dev = netdev_priv(netdev);
106         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
107         int i;
108         char *p = NULL;
109 
110         for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
111                 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
112                 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
113         }
114 }
115 
116 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
117 {
118         u8 *p = data;
119         int i;
120 
121         switch (stringset) {
122         case ETH_SS_STATS:
123                 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
124                         memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
125                         p += ETH_GSTRING_LEN;
126                 }
127         }
128 }
129 
130 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
131 
132 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
133         .get_settings      = usbnet_get_settings,
134         .set_settings      = usbnet_set_settings,
135         .get_link          = usbnet_get_link,
136         .nway_reset        = usbnet_nway_reset,
137         .get_drvinfo       = usbnet_get_drvinfo,
138         .get_msglevel      = usbnet_get_msglevel,
139         .set_msglevel      = usbnet_set_msglevel,
140         .get_ts_info       = ethtool_op_get_ts_info,
141         .get_sset_count    = cdc_ncm_get_sset_count,
142         .get_strings       = cdc_ncm_get_strings,
143         .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
144 };
145 
146 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
147 {
148         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
149         u32 val, max, min;
150 
151         /* clamp new_rx to sane values */
152         min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
153         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
154 
155         /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
156         if (max < min) {
157                 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
158                          le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
159                 max = min;
160         }
161 
162         val = clamp_t(u32, new_rx, min, max);
163         if (val != new_rx)
164                 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
165 
166         return val;
167 }
168 
169 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
170 {
171         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
172         u32 val, max, min;
173 
174         /* clamp new_tx to sane values */
175         min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
176         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
177 
178         /* some devices set dwNtbOutMaxSize too low for the above default */
179         min = min(min, max);
180 
181         val = clamp_t(u32, new_tx, min, max);
182         if (val != new_tx)
183                 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
184 
185         return val;
186 }
187 
188 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
189 {
190         struct usbnet *dev = netdev_priv(to_net_dev(d));
191         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
192 
193         return sprintf(buf, "%u\n", ctx->min_tx_pkt);
194 }
195 
196 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
197 {
198         struct usbnet *dev = netdev_priv(to_net_dev(d));
199         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
200 
201         return sprintf(buf, "%u\n", ctx->rx_max);
202 }
203 
204 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
205 {
206         struct usbnet *dev = netdev_priv(to_net_dev(d));
207         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
208 
209         return sprintf(buf, "%u\n", ctx->tx_max);
210 }
211 
212 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
213 {
214         struct usbnet *dev = netdev_priv(to_net_dev(d));
215         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
216 
217         return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
218 }
219 
220 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
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         unsigned long val;
225 
226         /* no need to restrict values - anything from 0 to infinity is OK */
227         if (kstrtoul(buf, 0, &val))
228                 return -EINVAL;
229 
230         ctx->min_tx_pkt = val;
231         return len;
232 }
233 
234 static ssize_t cdc_ncm_store_rx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
235 {
236         struct usbnet *dev = netdev_priv(to_net_dev(d));
237         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
238         unsigned long val;
239 
240         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
241                 return -EINVAL;
242 
243         cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
244         return len;
245 }
246 
247 static ssize_t cdc_ncm_store_tx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
248 {
249         struct usbnet *dev = netdev_priv(to_net_dev(d));
250         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
251         unsigned long val;
252 
253         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
254                 return -EINVAL;
255 
256         cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
257         return len;
258 }
259 
260 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
261 {
262         struct usbnet *dev = netdev_priv(to_net_dev(d));
263         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
264         ssize_t ret;
265         unsigned long val;
266 
267         ret = kstrtoul(buf, 0, &val);
268         if (ret)
269                 return ret;
270         if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
271                 return -EINVAL;
272 
273         spin_lock_bh(&ctx->mtx);
274         ctx->timer_interval = val * NSEC_PER_USEC;
275         if (!ctx->timer_interval)
276                 ctx->tx_timer_pending = 0;
277         spin_unlock_bh(&ctx->mtx);
278         return len;
279 }
280 
281 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
282 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
283 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
284 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
285 
286 #define NCM_PARM_ATTR(name, format, tocpu)                              \
287 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
288 { \
289         struct usbnet *dev = netdev_priv(to_net_dev(d)); \
290         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
291         return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));    \
292 } \
293 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
294 
295 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
296 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
297 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
298 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
299 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
300 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
301 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
302 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
303 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
304 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
305 
306 static struct attribute *cdc_ncm_sysfs_attrs[] = {
307         &dev_attr_min_tx_pkt.attr,
308         &dev_attr_rx_max.attr,
309         &dev_attr_tx_max.attr,
310         &dev_attr_tx_timer_usecs.attr,
311         &dev_attr_bmNtbFormatsSupported.attr,
312         &dev_attr_dwNtbInMaxSize.attr,
313         &dev_attr_wNdpInDivisor.attr,
314         &dev_attr_wNdpInPayloadRemainder.attr,
315         &dev_attr_wNdpInAlignment.attr,
316         &dev_attr_dwNtbOutMaxSize.attr,
317         &dev_attr_wNdpOutDivisor.attr,
318         &dev_attr_wNdpOutPayloadRemainder.attr,
319         &dev_attr_wNdpOutAlignment.attr,
320         &dev_attr_wNtbOutMaxDatagrams.attr,
321         NULL,
322 };
323 
324 static struct attribute_group cdc_ncm_sysfs_attr_group = {
325         .name = "cdc_ncm",
326         .attrs = cdc_ncm_sysfs_attrs,
327 };
328 
329 /* handle rx_max and tx_max changes */
330 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
331 {
332         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
333         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
334         u32 val;
335 
336         val = cdc_ncm_check_rx_max(dev, new_rx);
337 
338         /* inform device about NTB input size changes */
339         if (val != ctx->rx_max) {
340                 __le32 dwNtbInMaxSize = cpu_to_le32(val);
341 
342                 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
343 
344                 /* tell device to use new size */
345                 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
346                                      USB_TYPE_CLASS | USB_DIR_OUT
347                                      | USB_RECIP_INTERFACE,
348                                      0, iface_no, &dwNtbInMaxSize, 4) < 0)
349                         dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
350                 else
351                         ctx->rx_max = val;
352         }
353 
354         /* usbnet use these values for sizing rx queues */
355         if (dev->rx_urb_size != ctx->rx_max) {
356                 dev->rx_urb_size = ctx->rx_max;
357                 if (netif_running(dev->net))
358                         usbnet_unlink_rx_urbs(dev);
359         }
360 
361         val = cdc_ncm_check_tx_max(dev, new_tx);
362         if (val != ctx->tx_max)
363                 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
364 
365         /* Adding a pad byte here if necessary simplifies the handling
366          * in cdc_ncm_fill_tx_frame, making tx_max always represent
367          * the real skb max size.
368          *
369          * We cannot use dev->maxpacket here because this is called from
370          * .bind which is called before usbnet sets up dev->maxpacket
371          */
372         if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
373             val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
374                 val++;
375 
376         /* we might need to flush any pending tx buffers if running */
377         if (netif_running(dev->net) && val > ctx->tx_max) {
378                 netif_tx_lock_bh(dev->net);
379                 usbnet_start_xmit(NULL, dev->net);
380                 /* make sure tx_curr_skb is reallocated if it was empty */
381                 if (ctx->tx_curr_skb) {
382                         dev_kfree_skb_any(ctx->tx_curr_skb);
383                         ctx->tx_curr_skb = NULL;
384                 }
385                 ctx->tx_max = val;
386                 netif_tx_unlock_bh(dev->net);
387         } else {
388                 ctx->tx_max = val;
389         }
390 
391         dev->hard_mtu = ctx->tx_max;
392 
393         /* max qlen depend on hard_mtu and rx_urb_size */
394         usbnet_update_max_qlen(dev);
395 
396         /* never pad more than 3 full USB packets per transfer */
397         ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
398                                   CDC_NCM_MIN_TX_PKT, ctx->tx_max);
399 }
400 
401 /* helpers for NCM and MBIM differences */
402 static u8 cdc_ncm_flags(struct usbnet *dev)
403 {
404         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
405 
406         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
407                 return ctx->mbim_desc->bmNetworkCapabilities;
408         if (ctx->func_desc)
409                 return ctx->func_desc->bmNetworkCapabilities;
410         return 0;
411 }
412 
413 static int cdc_ncm_eth_hlen(struct usbnet *dev)
414 {
415         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
416                 return 0;
417         return ETH_HLEN;
418 }
419 
420 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
421 {
422         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
423                 return CDC_MBIM_MIN_DATAGRAM_SIZE;
424         return CDC_NCM_MIN_DATAGRAM_SIZE;
425 }
426 
427 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
428 {
429         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
430 
431         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
432                 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
433         if (ctx->ether_desc)
434                 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
435         return CDC_NCM_MAX_DATAGRAM_SIZE;
436 }
437 
438 /* initial one-time device setup.  MUST be called with the data interface
439  * in altsetting 0
440  */
441 static int cdc_ncm_init(struct usbnet *dev)
442 {
443         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
444         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
445         int err;
446 
447         err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
448                               USB_TYPE_CLASS | USB_DIR_IN
449                               |USB_RECIP_INTERFACE,
450                               0, iface_no, &ctx->ncm_parm,
451                               sizeof(ctx->ncm_parm));
452         if (err < 0) {
453                 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
454                 return err; /* GET_NTB_PARAMETERS is required */
455         }
456 
457         /* set CRC Mode */
458         if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
459                 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
460                 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
461                                        USB_TYPE_CLASS | USB_DIR_OUT
462                                        | USB_RECIP_INTERFACE,
463                                        USB_CDC_NCM_CRC_NOT_APPENDED,
464                                        iface_no, NULL, 0);
465                 if (err < 0)
466                         dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
467         }
468 
469         /* set NTB format, if both formats are supported.
470          *
471          * "The host shall only send this command while the NCM Data
472          *  Interface is in alternate setting 0."
473          */
474         if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
475                                                 USB_CDC_NCM_NTB32_SUPPORTED) {
476                 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
477                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
478                                        USB_TYPE_CLASS | USB_DIR_OUT
479                                        | USB_RECIP_INTERFACE,
480                                        USB_CDC_NCM_NTB16_FORMAT,
481                                        iface_no, NULL, 0);
482                 if (err < 0)
483                         dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
484         }
485 
486         /* set initial device values */
487         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
488         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
489         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
490         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
491         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
492         /* devices prior to NCM Errata shall set this field to zero */
493         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
494 
495         dev_dbg(&dev->intf->dev,
496                 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
497                 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
498                 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
499 
500         /* max count of tx datagrams */
501         if ((ctx->tx_max_datagrams == 0) ||
502                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
503                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
504 
505         /* set up maximum NDP size */
506         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
507 
508         /* initial coalescing timer interval */
509         ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
510 
511         return 0;
512 }
513 
514 /* set a new max datagram size */
515 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
516 {
517         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
518         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
519         __le16 max_datagram_size;
520         u16 mbim_mtu;
521         int err;
522 
523         /* set default based on descriptors */
524         ctx->max_datagram_size = clamp_t(u32, new_size,
525                                          cdc_ncm_min_dgram_size(dev),
526                                          CDC_NCM_MAX_DATAGRAM_SIZE);
527 
528         /* inform the device about the selected Max Datagram Size? */
529         if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
530                 goto out;
531 
532         /* read current mtu value from device */
533         err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
534                               USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
535                               0, iface_no, &max_datagram_size, 2);
536         if (err < 0) {
537                 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
538                 goto out;
539         }
540 
541         if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
542                 goto out;
543 
544         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
545         err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
546                                USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
547                                0, iface_no, &max_datagram_size, 2);
548         if (err < 0)
549                 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
550 
551 out:
552         /* set MTU to max supported by the device if necessary */
553         dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
554 
555         /* do not exceed operater preferred MTU */
556         if (ctx->mbim_extended_desc) {
557                 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
558                 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
559                         dev->net->mtu = mbim_mtu;
560         }
561 }
562 
563 static void cdc_ncm_fix_modulus(struct usbnet *dev)
564 {
565         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
566         u32 val;
567 
568         /*
569          * verify that the structure alignment is:
570          * - power of two
571          * - not greater than the maximum transmit length
572          * - not less than four bytes
573          */
574         val = ctx->tx_ndp_modulus;
575 
576         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
577             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
578                 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
579                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
580         }
581 
582         /*
583          * verify that the payload alignment is:
584          * - power of two
585          * - not greater than the maximum transmit length
586          * - not less than four bytes
587          */
588         val = ctx->tx_modulus;
589 
590         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
591             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
592                 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
593                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
594         }
595 
596         /* verify the payload remainder */
597         if (ctx->tx_remainder >= ctx->tx_modulus) {
598                 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
599                 ctx->tx_remainder = 0;
600         }
601 
602         /* adjust TX-remainder according to NCM specification. */
603         ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
604                              (ctx->tx_modulus - 1));
605 }
606 
607 static int cdc_ncm_setup(struct usbnet *dev)
608 {
609         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
610         u32 def_rx, def_tx;
611 
612         /* be conservative when selecting intial buffer size to
613          * increase the number of hosts this will work for
614          */
615         def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
616                        le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
617         def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
618                        le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
619 
620         /* clamp rx_max and tx_max and inform device */
621         cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
622 
623         /* sanitize the modulus and remainder values */
624         cdc_ncm_fix_modulus(dev);
625 
626         /* set max datagram size */
627         cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
628         return 0;
629 }
630 
631 static void
632 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
633 {
634         struct usb_host_endpoint *e, *in = NULL, *out = NULL;
635         u8 ep;
636 
637         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
638 
639                 e = intf->cur_altsetting->endpoint + ep;
640                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
641                 case USB_ENDPOINT_XFER_INT:
642                         if (usb_endpoint_dir_in(&e->desc)) {
643                                 if (!dev->status)
644                                         dev->status = e;
645                         }
646                         break;
647 
648                 case USB_ENDPOINT_XFER_BULK:
649                         if (usb_endpoint_dir_in(&e->desc)) {
650                                 if (!in)
651                                         in = e;
652                         } else {
653                                 if (!out)
654                                         out = e;
655                         }
656                         break;
657 
658                 default:
659                         break;
660                 }
661         }
662         if (in && !dev->in)
663                 dev->in = usb_rcvbulkpipe(dev->udev,
664                                           in->desc.bEndpointAddress &
665                                           USB_ENDPOINT_NUMBER_MASK);
666         if (out && !dev->out)
667                 dev->out = usb_sndbulkpipe(dev->udev,
668                                            out->desc.bEndpointAddress &
669                                            USB_ENDPOINT_NUMBER_MASK);
670 }
671 
672 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
673 {
674         if (ctx == NULL)
675                 return;
676 
677         if (ctx->tx_rem_skb != NULL) {
678                 dev_kfree_skb_any(ctx->tx_rem_skb);
679                 ctx->tx_rem_skb = NULL;
680         }
681 
682         if (ctx->tx_curr_skb != NULL) {
683                 dev_kfree_skb_any(ctx->tx_curr_skb);
684                 ctx->tx_curr_skb = NULL;
685         }
686 
687         kfree(ctx);
688 }
689 
690 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
691 {
692         const struct usb_cdc_union_desc *union_desc = NULL;
693         struct cdc_ncm_ctx *ctx;
694         struct usb_driver *driver;
695         u8 *buf;
696         int len;
697         int temp;
698         u8 iface_no;
699 
700         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
701         if (!ctx)
702                 return -ENOMEM;
703 
704         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
705         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
706         ctx->bh.data = (unsigned long)dev;
707         ctx->bh.func = cdc_ncm_txpath_bh;
708         atomic_set(&ctx->stop, 0);
709         spin_lock_init(&ctx->mtx);
710 
711         /* store ctx pointer in device data field */
712         dev->data[0] = (unsigned long)ctx;
713 
714         /* only the control interface can be successfully probed */
715         ctx->control = intf;
716 
717         /* get some pointers */
718         driver = driver_of(intf);
719         buf = intf->cur_altsetting->extra;
720         len = intf->cur_altsetting->extralen;
721 
722         /* parse through descriptors associated with control interface */
723         while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
724 
725                 if (buf[1] != USB_DT_CS_INTERFACE)
726                         goto advance;
727 
728                 switch (buf[2]) {
729                 case USB_CDC_UNION_TYPE:
730                         if (buf[0] < sizeof(*union_desc))
731                                 break;
732 
733                         union_desc = (const struct usb_cdc_union_desc *)buf;
734                         /* the master must be the interface we are probing */
735                         if (intf->cur_altsetting->desc.bInterfaceNumber !=
736                             union_desc->bMasterInterface0) {
737                                 dev_dbg(&intf->dev, "bogus CDC Union\n");
738                                 goto error;
739                         }
740                         ctx->data = usb_ifnum_to_if(dev->udev,
741                                                     union_desc->bSlaveInterface0);
742                         break;
743 
744                 case USB_CDC_ETHERNET_TYPE:
745                         if (buf[0] < sizeof(*(ctx->ether_desc)))
746                                 break;
747 
748                         ctx->ether_desc =
749                                         (const struct usb_cdc_ether_desc *)buf;
750                         break;
751 
752                 case USB_CDC_NCM_TYPE:
753                         if (buf[0] < sizeof(*(ctx->func_desc)))
754                                 break;
755 
756                         ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
757                         break;
758 
759                 case USB_CDC_MBIM_TYPE:
760                         if (buf[0] < sizeof(*(ctx->mbim_desc)))
761                                 break;
762 
763                         ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
764                         break;
765 
766                 case USB_CDC_MBIM_EXTENDED_TYPE:
767                         if (buf[0] < sizeof(*(ctx->mbim_extended_desc)))
768                                 break;
769 
770                         ctx->mbim_extended_desc =
771                                 (const struct usb_cdc_mbim_extended_desc *)buf;
772                         break;
773 
774                 default:
775                         break;
776                 }
777 advance:
778                 /* advance to next descriptor */
779                 temp = buf[0];
780                 buf += temp;
781                 len -= temp;
782         }
783 
784         /* some buggy devices have an IAD but no CDC Union */
785         if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
786                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
787                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
788         }
789 
790         /* check if we got everything */
791         if (!ctx->data) {
792                 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
793                 goto error;
794         }
795         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
796                 if (!ctx->mbim_desc) {
797                         dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
798                         goto error;
799                 }
800         } else {
801                 if (!ctx->ether_desc || !ctx->func_desc) {
802                         dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
803                         goto error;
804                 }
805         }
806 
807         /* claim data interface, if different from control */
808         if (ctx->data != ctx->control) {
809                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
810                 if (temp) {
811                         dev_dbg(&intf->dev, "failed to claim data intf\n");
812                         goto error;
813                 }
814         }
815 
816         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
817 
818         /* reset data interface */
819         temp = usb_set_interface(dev->udev, iface_no, 0);
820         if (temp) {
821                 dev_dbg(&intf->dev, "set interface failed\n");
822                 goto error2;
823         }
824 
825         /* initialize basic device settings */
826         if (cdc_ncm_init(dev))
827                 goto error2;
828 
829         /* configure data interface */
830         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
831         if (temp) {
832                 dev_dbg(&intf->dev, "set interface failed\n");
833                 goto error2;
834         }
835 
836         cdc_ncm_find_endpoints(dev, ctx->data);
837         cdc_ncm_find_endpoints(dev, ctx->control);
838         if (!dev->in || !dev->out || !dev->status) {
839                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
840                 goto error2;
841         }
842 
843         usb_set_intfdata(ctx->data, dev);
844         usb_set_intfdata(ctx->control, dev);
845 
846         if (ctx->ether_desc) {
847                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
848                 if (temp) {
849                         dev_dbg(&intf->dev, "failed to get mac address\n");
850                         goto error2;
851                 }
852                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
853         }
854 
855         /* finish setting up the device specific data */
856         cdc_ncm_setup(dev);
857 
858         /* override ethtool_ops */
859         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
860 
861         /* add our sysfs attrs */
862         dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
863 
864         return 0;
865 
866 error2:
867         usb_set_intfdata(ctx->control, NULL);
868         usb_set_intfdata(ctx->data, NULL);
869         if (ctx->data != ctx->control)
870                 usb_driver_release_interface(driver, ctx->data);
871 error:
872         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
873         dev->data[0] = 0;
874         dev_info(&intf->dev, "bind() failure\n");
875         return -ENODEV;
876 }
877 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
878 
879 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
880 {
881         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
882         struct usb_driver *driver = driver_of(intf);
883 
884         if (ctx == NULL)
885                 return;         /* no setup */
886 
887         atomic_set(&ctx->stop, 1);
888 
889         if (hrtimer_active(&ctx->tx_timer))
890                 hrtimer_cancel(&ctx->tx_timer);
891 
892         tasklet_kill(&ctx->bh);
893 
894         /* handle devices with combined control and data interface */
895         if (ctx->control == ctx->data)
896                 ctx->data = NULL;
897 
898         /* disconnect master --> disconnect slave */
899         if (intf == ctx->control && ctx->data) {
900                 usb_set_intfdata(ctx->data, NULL);
901                 usb_driver_release_interface(driver, ctx->data);
902                 ctx->data = NULL;
903 
904         } else if (intf == ctx->data && ctx->control) {
905                 usb_set_intfdata(ctx->control, NULL);
906                 usb_driver_release_interface(driver, ctx->control);
907                 ctx->control = NULL;
908         }
909 
910         usb_set_intfdata(intf, NULL);
911         cdc_ncm_free(ctx);
912 }
913 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
914 
915 /* Return the number of the MBIM control interface altsetting iff it
916  * is preferred and available,
917  */
918 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
919 {
920         struct usb_host_interface *alt;
921 
922         /* The MBIM spec defines a NCM compatible default altsetting,
923          * which we may have matched:
924          *
925          *  "Functions that implement both NCM 1.0 and MBIM (an
926          *   “NCM/MBIM function”) according to this recommendation
927          *   shall provide two alternate settings for the
928          *   Communication Interface.  Alternate setting 0, and the
929          *   associated class and endpoint descriptors, shall be
930          *   constructed according to the rules given for the
931          *   Communication Interface in section 5 of [USBNCM10].
932          *   Alternate setting 1, and the associated class and
933          *   endpoint descriptors, shall be constructed according to
934          *   the rules given in section 6 (USB Device Model) of this
935          *   specification."
936          */
937         if (intf->num_altsetting < 2)
938                 return intf->cur_altsetting->desc.bAlternateSetting;
939 
940         if (prefer_mbim) {
941                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
942                 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
943                         return CDC_NCM_COMM_ALTSETTING_MBIM;
944         }
945         return CDC_NCM_COMM_ALTSETTING_NCM;
946 }
947 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
948 
949 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
950 {
951         int ret;
952 
953         /* MBIM backwards compatible function? */
954         if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
955                 return -ENODEV;
956 
957         /* The NCM data altsetting is fixed */
958         ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM);
959 
960         /*
961          * We should get an event when network connection is "connected" or
962          * "disconnected". Set network connection in "disconnected" state
963          * (carrier is OFF) during attach, so the IP network stack does not
964          * start IPv6 negotiation and more.
965          */
966         usbnet_link_change(dev, 0, 0);
967         return ret;
968 }
969 
970 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
971 {
972         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
973 
974         if (skb->len + align > max)
975                 align = max - skb->len;
976         if (align && skb_tailroom(skb) >= align)
977                 memset(skb_put(skb, align), 0, align);
978 }
979 
980 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
981  * allocating a new one within skb
982  */
983 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
984 {
985         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
986         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
987         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
988 
989         /* follow the chain of NDPs, looking for a match */
990         while (ndpoffset) {
991                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
992                 if  (ndp16->dwSignature == sign)
993                         return ndp16;
994                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
995         }
996 
997         /* align new NDP */
998         cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
999 
1000         /* verify that there is room for the NDP and the datagram (reserve) */
1001         if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1002                 return NULL;
1003 
1004         /* link to it */
1005         if (ndp16)
1006                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1007         else
1008                 nth16->wNdpIndex = cpu_to_le16(skb->len);
1009 
1010         /* push a new empty NDP */
1011         ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1012         ndp16->dwSignature = sign;
1013         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1014         return ndp16;
1015 }
1016 
1017 struct sk_buff *
1018 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1019 {
1020         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1021         struct usb_cdc_ncm_nth16 *nth16;
1022         struct usb_cdc_ncm_ndp16 *ndp16;
1023         struct sk_buff *skb_out;
1024         u16 n = 0, index, ndplen;
1025         u8 ready2send = 0;
1026 
1027         /* if there is a remaining skb, it gets priority */
1028         if (skb != NULL) {
1029                 swap(skb, ctx->tx_rem_skb);
1030                 swap(sign, ctx->tx_rem_sign);
1031         } else {
1032                 ready2send = 1;
1033         }
1034 
1035         /* check if we are resuming an OUT skb */
1036         skb_out = ctx->tx_curr_skb;
1037 
1038         /* allocate a new OUT skb */
1039         if (!skb_out) {
1040                 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1041                 if (skb_out == NULL) {
1042                         if (skb != NULL) {
1043                                 dev_kfree_skb_any(skb);
1044                                 dev->net->stats.tx_dropped++;
1045                         }
1046                         goto exit_no_skb;
1047                 }
1048                 /* fill out the initial 16-bit NTB header */
1049                 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1050                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1051                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1052                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1053 
1054                 /* count total number of frames in this NTB */
1055                 ctx->tx_curr_frame_num = 0;
1056 
1057                 /* recent payload counter for this skb_out */
1058                 ctx->tx_curr_frame_payload = 0;
1059         }
1060 
1061         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1062                 /* send any remaining skb first */
1063                 if (skb == NULL) {
1064                         skb = ctx->tx_rem_skb;
1065                         sign = ctx->tx_rem_sign;
1066                         ctx->tx_rem_skb = NULL;
1067 
1068                         /* check for end of skb */
1069                         if (skb == NULL)
1070                                 break;
1071                 }
1072 
1073                 /* get the appropriate NDP for this skb */
1074                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1075 
1076                 /* align beginning of next frame */
1077                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1078 
1079                 /* check if we had enough room left for both NDP and frame */
1080                 if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
1081                         if (n == 0) {
1082                                 /* won't fit, MTU problem? */
1083                                 dev_kfree_skb_any(skb);
1084                                 skb = NULL;
1085                                 dev->net->stats.tx_dropped++;
1086                         } else {
1087                                 /* no room for skb - store for later */
1088                                 if (ctx->tx_rem_skb != NULL) {
1089                                         dev_kfree_skb_any(ctx->tx_rem_skb);
1090                                         dev->net->stats.tx_dropped++;
1091                                 }
1092                                 ctx->tx_rem_skb = skb;
1093                                 ctx->tx_rem_sign = sign;
1094                                 skb = NULL;
1095                                 ready2send = 1;
1096                                 ctx->tx_reason_ntb_full++;      /* count reason for transmitting */
1097                         }
1098                         break;
1099                 }
1100 
1101                 /* calculate frame number withing this NDP */
1102                 ndplen = le16_to_cpu(ndp16->wLength);
1103                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1104 
1105                 /* OK, add this skb */
1106                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1107                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1108                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1109                 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1110                 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1111                 dev_kfree_skb_any(skb);
1112                 skb = NULL;
1113 
1114                 /* send now if this NDP is full */
1115                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1116                         ready2send = 1;
1117                         ctx->tx_reason_ndp_full++;      /* count reason for transmitting */
1118                         break;
1119                 }
1120         }
1121 
1122         /* free up any dangling skb */
1123         if (skb != NULL) {
1124                 dev_kfree_skb_any(skb);
1125                 skb = NULL;
1126                 dev->net->stats.tx_dropped++;
1127         }
1128 
1129         ctx->tx_curr_frame_num = n;
1130 
1131         if (n == 0) {
1132                 /* wait for more frames */
1133                 /* push variables */
1134                 ctx->tx_curr_skb = skb_out;
1135                 goto exit_no_skb;
1136 
1137         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1138                 /* wait for more frames */
1139                 /* push variables */
1140                 ctx->tx_curr_skb = skb_out;
1141                 /* set the pending count */
1142                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1143                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1144                 goto exit_no_skb;
1145 
1146         } else {
1147                 if (n == ctx->tx_max_datagrams)
1148                         ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1149                 /* frame goes out */
1150                 /* variables will be reset at next call */
1151         }
1152 
1153         /* If collected data size is less or equal ctx->min_tx_pkt
1154          * bytes, we send buffers as it is. If we get more data, it
1155          * would be more efficient for USB HS mobile device with DMA
1156          * engine to receive a full size NTB, than canceling DMA
1157          * transfer and receiving a short packet.
1158          *
1159          * This optimization support is pointless if we end up sending
1160          * a ZLP after full sized NTBs.
1161          */
1162         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1163             skb_out->len > ctx->min_tx_pkt)
1164                 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1165                        ctx->tx_max - skb_out->len);
1166         else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1167                 *skb_put(skb_out, 1) = 0;       /* force short packet */
1168 
1169         /* set final frame length */
1170         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1171         nth16->wBlockLength = cpu_to_le16(skb_out->len);
1172 
1173         /* return skb */
1174         ctx->tx_curr_skb = NULL;
1175         dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
1176 
1177         /* keep private stats: framing overhead and number of NTBs */
1178         ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1179         ctx->tx_ntbs++;
1180 
1181         /* usbnet has already counted all the framing overhead.
1182          * Adjust the stats so that the tx_bytes counter show real
1183          * payload data instead.
1184          */
1185         dev->net->stats.tx_bytes -= skb_out->len - ctx->tx_curr_frame_payload;
1186 
1187         return skb_out;
1188 
1189 exit_no_skb:
1190         /* Start timer, if there is a remaining non-empty skb */
1191         if (ctx->tx_curr_skb != NULL && n > 0)
1192                 cdc_ncm_tx_timeout_start(ctx);
1193         return NULL;
1194 }
1195 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1196 
1197 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1198 {
1199         /* start timer, if not already started */
1200         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1201                 hrtimer_start(&ctx->tx_timer,
1202                                 ktime_set(0, ctx->timer_interval),
1203                                 HRTIMER_MODE_REL);
1204 }
1205 
1206 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1207 {
1208         struct cdc_ncm_ctx *ctx =
1209                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
1210 
1211         if (!atomic_read(&ctx->stop))
1212                 tasklet_schedule(&ctx->bh);
1213         return HRTIMER_NORESTART;
1214 }
1215 
1216 static void cdc_ncm_txpath_bh(unsigned long param)
1217 {
1218         struct usbnet *dev = (struct usbnet *)param;
1219         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1220 
1221         spin_lock_bh(&ctx->mtx);
1222         if (ctx->tx_timer_pending != 0) {
1223                 ctx->tx_timer_pending--;
1224                 cdc_ncm_tx_timeout_start(ctx);
1225                 spin_unlock_bh(&ctx->mtx);
1226         } else if (dev->net != NULL) {
1227                 ctx->tx_reason_timeout++;       /* count reason for transmitting */
1228                 spin_unlock_bh(&ctx->mtx);
1229                 netif_tx_lock_bh(dev->net);
1230                 usbnet_start_xmit(NULL, dev->net);
1231                 netif_tx_unlock_bh(dev->net);
1232         } else {
1233                 spin_unlock_bh(&ctx->mtx);
1234         }
1235 }
1236 
1237 struct sk_buff *
1238 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1239 {
1240         struct sk_buff *skb_out;
1241         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1242 
1243         /*
1244          * The Ethernet API we are using does not support transmitting
1245          * multiple Ethernet frames in a single call. This driver will
1246          * accumulate multiple Ethernet frames and send out a larger
1247          * USB frame when the USB buffer is full or when a single jiffies
1248          * timeout happens.
1249          */
1250         if (ctx == NULL)
1251                 goto error;
1252 
1253         spin_lock_bh(&ctx->mtx);
1254         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1255         spin_unlock_bh(&ctx->mtx);
1256         return skb_out;
1257 
1258 error:
1259         if (skb != NULL)
1260                 dev_kfree_skb_any(skb);
1261 
1262         return NULL;
1263 }
1264 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1265 
1266 /* verify NTB header and return offset of first NDP, or negative error */
1267 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1268 {
1269         struct usbnet *dev = netdev_priv(skb_in->dev);
1270         struct usb_cdc_ncm_nth16 *nth16;
1271         int len;
1272         int ret = -EINVAL;
1273 
1274         if (ctx == NULL)
1275                 goto error;
1276 
1277         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1278                                         sizeof(struct usb_cdc_ncm_ndp16))) {
1279                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1280                 goto error;
1281         }
1282 
1283         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1284 
1285         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1286                 netif_dbg(dev, rx_err, dev->net,
1287                           "invalid NTH16 signature <%#010x>\n",
1288                           le32_to_cpu(nth16->dwSignature));
1289                 goto error;
1290         }
1291 
1292         len = le16_to_cpu(nth16->wBlockLength);
1293         if (len > ctx->rx_max) {
1294                 netif_dbg(dev, rx_err, dev->net,
1295                           "unsupported NTB block length %u/%u\n", len,
1296                           ctx->rx_max);
1297                 goto error;
1298         }
1299 
1300         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1301             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1302             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1303                 netif_dbg(dev, rx_err, dev->net,
1304                           "sequence number glitch prev=%d curr=%d\n",
1305                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1306         }
1307         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1308 
1309         ret = le16_to_cpu(nth16->wNdpIndex);
1310 error:
1311         return ret;
1312 }
1313 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1314 
1315 /* verify NDP header and return number of datagrams, or negative error */
1316 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1317 {
1318         struct usbnet *dev = netdev_priv(skb_in->dev);
1319         struct usb_cdc_ncm_ndp16 *ndp16;
1320         int ret = -EINVAL;
1321 
1322         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1323                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1324                           ndpoffset);
1325                 goto error;
1326         }
1327         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1328 
1329         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1330                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1331                           le16_to_cpu(ndp16->wLength));
1332                 goto error;
1333         }
1334 
1335         ret = ((le16_to_cpu(ndp16->wLength) -
1336                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1337                                         sizeof(struct usb_cdc_ncm_dpe16));
1338         ret--; /* we process NDP entries except for the last one */
1339 
1340         if ((sizeof(struct usb_cdc_ncm_ndp16) +
1341              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1342                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1343                 ret = -EINVAL;
1344         }
1345 
1346 error:
1347         return ret;
1348 }
1349 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1350 
1351 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1352 {
1353         struct sk_buff *skb;
1354         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1355         int len;
1356         int nframes;
1357         int x;
1358         int offset;
1359         struct usb_cdc_ncm_ndp16 *ndp16;
1360         struct usb_cdc_ncm_dpe16 *dpe16;
1361         int ndpoffset;
1362         int loopcount = 50; /* arbitrary max preventing infinite loop */
1363         u32 payload = 0;
1364 
1365         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1366         if (ndpoffset < 0)
1367                 goto error;
1368 
1369 next_ndp:
1370         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1371         if (nframes < 0)
1372                 goto error;
1373 
1374         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1375 
1376         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1377                 netif_dbg(dev, rx_err, dev->net,
1378                           "invalid DPT16 signature <%#010x>\n",
1379                           le32_to_cpu(ndp16->dwSignature));
1380                 goto err_ndp;
1381         }
1382         dpe16 = ndp16->dpe16;
1383 
1384         for (x = 0; x < nframes; x++, dpe16++) {
1385                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1386                 len = le16_to_cpu(dpe16->wDatagramLength);
1387 
1388                 /*
1389                  * CDC NCM ch. 3.7
1390                  * All entries after first NULL entry are to be ignored
1391                  */
1392                 if ((offset == 0) || (len == 0)) {
1393                         if (!x)
1394                                 goto err_ndp; /* empty NTB */
1395                         break;
1396                 }
1397 
1398                 /* sanity checking */
1399                 if (((offset + len) > skb_in->len) ||
1400                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1401                         netif_dbg(dev, rx_err, dev->net,
1402                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1403                                   x, offset, len, skb_in);
1404                         if (!x)
1405                                 goto err_ndp;
1406                         break;
1407 
1408                 } else {
1409                         /* create a fresh copy to reduce truesize */
1410                         skb = netdev_alloc_skb_ip_align(dev->net,  len);
1411                         if (!skb)
1412                                 goto error;
1413                         memcpy(skb_put(skb, len), skb_in->data + offset, len);
1414                         usbnet_skb_return(dev, skb);
1415                         payload += len; /* count payload bytes in this NTB */
1416                 }
1417         }
1418 err_ndp:
1419         /* are there more NDPs to process? */
1420         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1421         if (ndpoffset && loopcount--)
1422                 goto next_ndp;
1423 
1424         /* update stats */
1425         ctx->rx_overhead += skb_in->len - payload;
1426         ctx->rx_ntbs++;
1427 
1428         return 1;
1429 error:
1430         return 0;
1431 }
1432 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1433 
1434 static void
1435 cdc_ncm_speed_change(struct usbnet *dev,
1436                      struct usb_cdc_speed_change *data)
1437 {
1438         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1439         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1440 
1441         /*
1442          * Currently the USB-NET API does not support reporting the actual
1443          * device speed. Do print it instead.
1444          */
1445         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1446                 netif_info(dev, link, dev->net,
1447                            "%u mbit/s downlink %u mbit/s uplink\n",
1448                            (unsigned int)(rx_speed / 1000000U),
1449                            (unsigned int)(tx_speed / 1000000U));
1450         } else {
1451                 netif_info(dev, link, dev->net,
1452                            "%u kbit/s downlink %u kbit/s uplink\n",
1453                            (unsigned int)(rx_speed / 1000U),
1454                            (unsigned int)(tx_speed / 1000U));
1455         }
1456 }
1457 
1458 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1459 {
1460         struct cdc_ncm_ctx *ctx;
1461         struct usb_cdc_notification *event;
1462 
1463         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1464 
1465         if (urb->actual_length < sizeof(*event))
1466                 return;
1467 
1468         /* test for split data in 8-byte chunks */
1469         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1470                 cdc_ncm_speed_change(dev,
1471                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1472                 return;
1473         }
1474 
1475         event = urb->transfer_buffer;
1476 
1477         switch (event->bNotificationType) {
1478         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1479                 /*
1480                  * According to the CDC NCM specification ch.7.1
1481                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1482                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1483                  */
1484                 netif_info(dev, link, dev->net,
1485                            "network connection: %sconnected\n",
1486                            !!event->wValue ? "" : "dis");
1487                 usbnet_link_change(dev, !!event->wValue, 0);
1488                 break;
1489 
1490         case USB_CDC_NOTIFY_SPEED_CHANGE:
1491                 if (urb->actual_length < (sizeof(*event) +
1492                                         sizeof(struct usb_cdc_speed_change)))
1493                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1494                 else
1495                         cdc_ncm_speed_change(dev,
1496                                              (struct usb_cdc_speed_change *)&event[1]);
1497                 break;
1498 
1499         default:
1500                 dev_dbg(&dev->udev->dev,
1501                         "NCM: unexpected notification 0x%02x!\n",
1502                         event->bNotificationType);
1503                 break;
1504         }
1505 }
1506 
1507 static const struct driver_info cdc_ncm_info = {
1508         .description = "CDC NCM",
1509         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1510         .bind = cdc_ncm_bind,
1511         .unbind = cdc_ncm_unbind,
1512         .manage_power = usbnet_manage_power,
1513         .status = cdc_ncm_status,
1514         .rx_fixup = cdc_ncm_rx_fixup,
1515         .tx_fixup = cdc_ncm_tx_fixup,
1516 };
1517 
1518 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1519 static const struct driver_info wwan_info = {
1520         .description = "Mobile Broadband Network Device",
1521         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1522                         | FLAG_WWAN,
1523         .bind = cdc_ncm_bind,
1524         .unbind = cdc_ncm_unbind,
1525         .manage_power = usbnet_manage_power,
1526         .status = cdc_ncm_status,
1527         .rx_fixup = cdc_ncm_rx_fixup,
1528         .tx_fixup = cdc_ncm_tx_fixup,
1529 };
1530 
1531 /* Same as wwan_info, but with FLAG_NOARP  */
1532 static const struct driver_info wwan_noarp_info = {
1533         .description = "Mobile Broadband Network Device (NO ARP)",
1534         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1535                         | FLAG_WWAN | FLAG_NOARP,
1536         .bind = cdc_ncm_bind,
1537         .unbind = cdc_ncm_unbind,
1538         .manage_power = usbnet_manage_power,
1539         .status = cdc_ncm_status,
1540         .rx_fixup = cdc_ncm_rx_fixup,
1541         .tx_fixup = cdc_ncm_tx_fixup,
1542 };
1543 
1544 static const struct usb_device_id cdc_devs[] = {
1545         /* Ericsson MBM devices like F5521gw */
1546         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1547                 | USB_DEVICE_ID_MATCH_VENDOR,
1548           .idVendor = 0x0bdb,
1549           .bInterfaceClass = USB_CLASS_COMM,
1550           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1551           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1552           .driver_info = (unsigned long) &wwan_info,
1553         },
1554 
1555         /* Dell branded MBM devices like DW5550 */
1556         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1557                 | USB_DEVICE_ID_MATCH_VENDOR,
1558           .idVendor = 0x413c,
1559           .bInterfaceClass = USB_CLASS_COMM,
1560           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1561           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1562           .driver_info = (unsigned long) &wwan_info,
1563         },
1564 
1565         /* Toshiba branded MBM devices */
1566         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1567                 | USB_DEVICE_ID_MATCH_VENDOR,
1568           .idVendor = 0x0930,
1569           .bInterfaceClass = USB_CLASS_COMM,
1570           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1571           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1572           .driver_info = (unsigned long) &wwan_info,
1573         },
1574 
1575         /* tag Huawei devices as wwan */
1576         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1577                                         USB_CLASS_COMM,
1578                                         USB_CDC_SUBCLASS_NCM,
1579                                         USB_CDC_PROTO_NONE),
1580           .driver_info = (unsigned long)&wwan_info,
1581         },
1582 
1583         /* Infineon(now Intel) HSPA Modem platform */
1584         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1585                 USB_CLASS_COMM,
1586                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1587           .driver_info = (unsigned long)&wwan_noarp_info,
1588         },
1589 
1590         /* Generic CDC-NCM devices */
1591         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1592                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1593                 .driver_info = (unsigned long)&cdc_ncm_info,
1594         },
1595         {
1596         },
1597 };
1598 MODULE_DEVICE_TABLE(usb, cdc_devs);
1599 
1600 static struct usb_driver cdc_ncm_driver = {
1601         .name = "cdc_ncm",
1602         .id_table = cdc_devs,
1603         .probe = usbnet_probe,
1604         .disconnect = usbnet_disconnect,
1605         .suspend = usbnet_suspend,
1606         .resume = usbnet_resume,
1607         .reset_resume = usbnet_resume,
1608         .supports_autosuspend = 1,
1609         .disable_hub_initiated_lpm = 1,
1610 };
1611 
1612 module_usb_driver(cdc_ncm_driver);
1613 
1614 MODULE_AUTHOR("Hans Petter Selasky");
1615 MODULE_DESCRIPTION("USB CDC NCM host driver");
1616 MODULE_LICENSE("Dual BSD/GPL");
1617 

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