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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/docs/devclass_docs/NCM10_012011.zip
 10  *
 11  * The NCM encoding, decoding and initialization logic
 12  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
 13  *
 14  * This software is available to you under a choice of one of two
 15  * licenses. You may choose this file to be licensed under the terms
 16  * of the GNU General Public License (GPL) Version 2 or the 2-clause
 17  * BSD license listed below:
 18  *
 19  * Redistribution and use in source and binary forms, with or without
 20  * modification, are permitted provided that the following conditions
 21  * are met:
 22  * 1. Redistributions of source code must retain the above copyright
 23  *    notice, this list of conditions and the following disclaimer.
 24  * 2. Redistributions in binary form must reproduce the above copyright
 25  *    notice, this list of conditions and the following disclaimer in the
 26  *    documentation and/or other materials provided with the distribution.
 27  *
 28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 38  * SUCH DAMAGE.
 39  */
 40 
 41 #include <linux/module.h>
 42 #include <linux/netdevice.h>
 43 #include <linux/ctype.h>
 44 #include <linux/etherdevice.h>
 45 #include <linux/ethtool.h>
 46 #include <linux/workqueue.h>
 47 #include <linux/mii.h>
 48 #include <linux/crc32.h>
 49 #include <linux/usb.h>
 50 #include <linux/hrtimer.h>
 51 #include <linux/atomic.h>
 52 #include <linux/usb/usbnet.h>
 53 #include <linux/usb/cdc.h>
 54 #include <linux/usb/cdc_ncm.h>
 55 
 56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
 57 static bool prefer_mbim = true;
 58 #else
 59 static bool prefer_mbim;
 60 #endif
 61 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
 62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
 63 
 64 static void cdc_ncm_txpath_bh(unsigned long param);
 65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
 66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
 67 static struct usb_driver cdc_ncm_driver;
 68 
 69 struct cdc_ncm_stats {
 70         char stat_string[ETH_GSTRING_LEN];
 71         int sizeof_stat;
 72         int stat_offset;
 73 };
 74 
 75 #define CDC_NCM_STAT(str, m) { \
 76                 .stat_string = str, \
 77                 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
 78                 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
 79 #define CDC_NCM_SIMPLE_STAT(m)  CDC_NCM_STAT(__stringify(m), m)
 80 
 81 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
 82         CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
 83         CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
 84         CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
 85         CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
 86         CDC_NCM_SIMPLE_STAT(tx_overhead),
 87         CDC_NCM_SIMPLE_STAT(tx_ntbs),
 88         CDC_NCM_SIMPLE_STAT(rx_overhead),
 89         CDC_NCM_SIMPLE_STAT(rx_ntbs),
 90 };
 91 
 92 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
 93 {
 94         switch (sset) {
 95         case ETH_SS_STATS:
 96                 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
 97         default:
 98                 return -EOPNOTSUPP;
 99         }
100 }
101 
102 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
103                                     struct ethtool_stats __always_unused *stats,
104                                     u64 *data)
105 {
106         struct usbnet *dev = netdev_priv(netdev);
107         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
108         int i;
109         char *p = NULL;
110 
111         for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
112                 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
113                 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
114         }
115 }
116 
117 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
118 {
119         u8 *p = data;
120         int i;
121 
122         switch (stringset) {
123         case ETH_SS_STATS:
124                 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
125                         memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
126                         p += ETH_GSTRING_LEN;
127                 }
128         }
129 }
130 
131 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
132 
133 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
134         .get_settings      = usbnet_get_settings,
135         .set_settings      = usbnet_set_settings,
136         .get_link          = usbnet_get_link,
137         .nway_reset        = usbnet_nway_reset,
138         .get_drvinfo       = usbnet_get_drvinfo,
139         .get_msglevel      = usbnet_get_msglevel,
140         .set_msglevel      = usbnet_set_msglevel,
141         .get_ts_info       = ethtool_op_get_ts_info,
142         .get_sset_count    = cdc_ncm_get_sset_count,
143         .get_strings       = cdc_ncm_get_strings,
144         .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
145 };
146 
147 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
148 {
149         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
150         u32 val, max, min;
151 
152         /* clamp new_rx to sane values */
153         min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
154         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
155 
156         /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
157         if (max < min) {
158                 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
159                          le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
160                 max = min;
161         }
162 
163         val = clamp_t(u32, new_rx, min, max);
164         if (val != new_rx)
165                 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
166 
167         return val;
168 }
169 
170 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
171 {
172         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
173         u32 val, max, min;
174 
175         /* clamp new_tx to sane values */
176         min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
177         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
178 
179         /* some devices set dwNtbOutMaxSize too low for the above default */
180         min = min(min, max);
181 
182         val = clamp_t(u32, new_tx, min, max);
183         if (val != new_tx)
184                 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
185 
186         return val;
187 }
188 
189 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
190 {
191         struct usbnet *dev = netdev_priv(to_net_dev(d));
192         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
193 
194         return sprintf(buf, "%u\n", ctx->min_tx_pkt);
195 }
196 
197 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
198 {
199         struct usbnet *dev = netdev_priv(to_net_dev(d));
200         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
201 
202         return sprintf(buf, "%u\n", ctx->rx_max);
203 }
204 
205 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
206 {
207         struct usbnet *dev = netdev_priv(to_net_dev(d));
208         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
209 
210         return sprintf(buf, "%u\n", ctx->tx_max);
211 }
212 
213 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
214 {
215         struct usbnet *dev = netdev_priv(to_net_dev(d));
216         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
217 
218         return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
219 }
220 
221 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
222 {
223         struct usbnet *dev = netdev_priv(to_net_dev(d));
224         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
225         unsigned long val;
226 
227         /* no need to restrict values - anything from 0 to infinity is OK */
228         if (kstrtoul(buf, 0, &val))
229                 return -EINVAL;
230 
231         ctx->min_tx_pkt = val;
232         return len;
233 }
234 
235 static ssize_t cdc_ncm_store_rx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
236 {
237         struct usbnet *dev = netdev_priv(to_net_dev(d));
238         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
239         unsigned long val;
240 
241         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
242                 return -EINVAL;
243 
244         cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
245         return len;
246 }
247 
248 static ssize_t cdc_ncm_store_tx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
249 {
250         struct usbnet *dev = netdev_priv(to_net_dev(d));
251         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
252         unsigned long val;
253 
254         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
255                 return -EINVAL;
256 
257         cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
258         return len;
259 }
260 
261 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
262 {
263         struct usbnet *dev = netdev_priv(to_net_dev(d));
264         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
265         ssize_t ret;
266         unsigned long val;
267 
268         ret = kstrtoul(buf, 0, &val);
269         if (ret)
270                 return ret;
271         if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
272                 return -EINVAL;
273 
274         spin_lock_bh(&ctx->mtx);
275         ctx->timer_interval = val * NSEC_PER_USEC;
276         if (!ctx->timer_interval)
277                 ctx->tx_timer_pending = 0;
278         spin_unlock_bh(&ctx->mtx);
279         return len;
280 }
281 
282 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
283 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
284 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
285 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
286 
287 #define NCM_PARM_ATTR(name, format, tocpu)                              \
288 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
289 { \
290         struct usbnet *dev = netdev_priv(to_net_dev(d)); \
291         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
292         return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));    \
293 } \
294 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
295 
296 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
297 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
298 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
299 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
300 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
301 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
302 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
303 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
304 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
305 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
306 
307 static struct attribute *cdc_ncm_sysfs_attrs[] = {
308         &dev_attr_min_tx_pkt.attr,
309         &dev_attr_rx_max.attr,
310         &dev_attr_tx_max.attr,
311         &dev_attr_tx_timer_usecs.attr,
312         &dev_attr_bmNtbFormatsSupported.attr,
313         &dev_attr_dwNtbInMaxSize.attr,
314         &dev_attr_wNdpInDivisor.attr,
315         &dev_attr_wNdpInPayloadRemainder.attr,
316         &dev_attr_wNdpInAlignment.attr,
317         &dev_attr_dwNtbOutMaxSize.attr,
318         &dev_attr_wNdpOutDivisor.attr,
319         &dev_attr_wNdpOutPayloadRemainder.attr,
320         &dev_attr_wNdpOutAlignment.attr,
321         &dev_attr_wNtbOutMaxDatagrams.attr,
322         NULL,
323 };
324 
325 static struct attribute_group cdc_ncm_sysfs_attr_group = {
326         .name = "cdc_ncm",
327         .attrs = cdc_ncm_sysfs_attrs,
328 };
329 
330 /* handle rx_max and tx_max changes */
331 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
332 {
333         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
334         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
335         u32 val;
336 
337         val = cdc_ncm_check_rx_max(dev, new_rx);
338 
339         /* inform device about NTB input size changes */
340         if (val != ctx->rx_max) {
341                 __le32 dwNtbInMaxSize = cpu_to_le32(val);
342 
343                 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
344 
345                 /* tell device to use new size */
346                 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
347                                      USB_TYPE_CLASS | USB_DIR_OUT
348                                      | USB_RECIP_INTERFACE,
349                                      0, iface_no, &dwNtbInMaxSize, 4) < 0)
350                         dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
351                 else
352                         ctx->rx_max = val;
353         }
354 
355         /* usbnet use these values for sizing rx queues */
356         if (dev->rx_urb_size != ctx->rx_max) {
357                 dev->rx_urb_size = ctx->rx_max;
358                 if (netif_running(dev->net))
359                         usbnet_unlink_rx_urbs(dev);
360         }
361 
362         val = cdc_ncm_check_tx_max(dev, new_tx);
363         if (val != ctx->tx_max)
364                 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
365 
366         /* Adding a pad byte here if necessary simplifies the handling
367          * in cdc_ncm_fill_tx_frame, making tx_max always represent
368          * the real skb max size.
369          *
370          * We cannot use dev->maxpacket here because this is called from
371          * .bind which is called before usbnet sets up dev->maxpacket
372          */
373         if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
374             val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
375                 val++;
376 
377         /* we might need to flush any pending tx buffers if running */
378         if (netif_running(dev->net) && val > ctx->tx_max) {
379                 netif_tx_lock_bh(dev->net);
380                 usbnet_start_xmit(NULL, dev->net);
381                 /* make sure tx_curr_skb is reallocated if it was empty */
382                 if (ctx->tx_curr_skb) {
383                         dev_kfree_skb_any(ctx->tx_curr_skb);
384                         ctx->tx_curr_skb = NULL;
385                 }
386                 ctx->tx_max = val;
387                 netif_tx_unlock_bh(dev->net);
388         } else {
389                 ctx->tx_max = val;
390         }
391 
392         dev->hard_mtu = ctx->tx_max;
393 
394         /* max qlen depend on hard_mtu and rx_urb_size */
395         usbnet_update_max_qlen(dev);
396 
397         /* never pad more than 3 full USB packets per transfer */
398         ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
399                                   CDC_NCM_MIN_TX_PKT, ctx->tx_max);
400 }
401 
402 /* helpers for NCM and MBIM differences */
403 static u8 cdc_ncm_flags(struct usbnet *dev)
404 {
405         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
406 
407         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
408                 return ctx->mbim_desc->bmNetworkCapabilities;
409         if (ctx->func_desc)
410                 return ctx->func_desc->bmNetworkCapabilities;
411         return 0;
412 }
413 
414 static int cdc_ncm_eth_hlen(struct usbnet *dev)
415 {
416         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
417                 return 0;
418         return ETH_HLEN;
419 }
420 
421 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
422 {
423         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
424                 return CDC_MBIM_MIN_DATAGRAM_SIZE;
425         return CDC_NCM_MIN_DATAGRAM_SIZE;
426 }
427 
428 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
429 {
430         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
431 
432         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
433                 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
434         if (ctx->ether_desc)
435                 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
436         return CDC_NCM_MAX_DATAGRAM_SIZE;
437 }
438 
439 /* initial one-time device setup.  MUST be called with the data interface
440  * in altsetting 0
441  */
442 static int cdc_ncm_init(struct usbnet *dev)
443 {
444         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
445         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
446         int err;
447 
448         err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
449                               USB_TYPE_CLASS | USB_DIR_IN
450                               |USB_RECIP_INTERFACE,
451                               0, iface_no, &ctx->ncm_parm,
452                               sizeof(ctx->ncm_parm));
453         if (err < 0) {
454                 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
455                 return err; /* GET_NTB_PARAMETERS is required */
456         }
457 
458         /* set CRC Mode */
459         if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
460                 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
461                 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
462                                        USB_TYPE_CLASS | USB_DIR_OUT
463                                        | USB_RECIP_INTERFACE,
464                                        USB_CDC_NCM_CRC_NOT_APPENDED,
465                                        iface_no, NULL, 0);
466                 if (err < 0)
467                         dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
468         }
469 
470         /* set NTB format, if both formats are supported.
471          *
472          * "The host shall only send this command while the NCM Data
473          *  Interface is in alternate setting 0."
474          */
475         if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
476                                                 USB_CDC_NCM_NTB32_SUPPORTED) {
477                 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
478                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
479                                        USB_TYPE_CLASS | USB_DIR_OUT
480                                        | USB_RECIP_INTERFACE,
481                                        USB_CDC_NCM_NTB16_FORMAT,
482                                        iface_no, NULL, 0);
483                 if (err < 0)
484                         dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
485         }
486 
487         /* set initial device values */
488         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
489         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
490         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
491         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
492         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
493         /* devices prior to NCM Errata shall set this field to zero */
494         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
495 
496         dev_dbg(&dev->intf->dev,
497                 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
498                 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
499                 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
500 
501         /* max count of tx datagrams */
502         if ((ctx->tx_max_datagrams == 0) ||
503                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
504                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
505 
506         /* set up maximum NDP size */
507         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
508 
509         /* initial coalescing timer interval */
510         ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
511 
512         return 0;
513 }
514 
515 /* set a new max datagram size */
516 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
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         __le16 max_datagram_size;
521         u16 mbim_mtu;
522         int err;
523 
524         /* set default based on descriptors */
525         ctx->max_datagram_size = clamp_t(u32, new_size,
526                                          cdc_ncm_min_dgram_size(dev),
527                                          CDC_NCM_MAX_DATAGRAM_SIZE);
528 
529         /* inform the device about the selected Max Datagram Size? */
530         if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
531                 goto out;
532 
533         /* read current mtu value from device */
534         err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
535                               USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
536                               0, iface_no, &max_datagram_size, 2);
537         if (err < 0) {
538                 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
539                 goto out;
540         }
541 
542         if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
543                 goto out;
544 
545         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
546         err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
547                                USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
548                                0, iface_no, &max_datagram_size, 2);
549         if (err < 0)
550                 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
551 
552 out:
553         /* set MTU to max supported by the device if necessary */
554         dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
555 
556         /* do not exceed operater preferred MTU */
557         if (ctx->mbim_extended_desc) {
558                 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
559                 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
560                         dev->net->mtu = mbim_mtu;
561         }
562 }
563 
564 static void cdc_ncm_fix_modulus(struct usbnet *dev)
565 {
566         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
567         u32 val;
568 
569         /*
570          * verify that the structure alignment is:
571          * - power of two
572          * - not greater than the maximum transmit length
573          * - not less than four bytes
574          */
575         val = ctx->tx_ndp_modulus;
576 
577         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
578             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
579                 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
580                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
581         }
582 
583         /*
584          * verify that the payload alignment is:
585          * - power of two
586          * - not greater than the maximum transmit length
587          * - not less than four bytes
588          */
589         val = ctx->tx_modulus;
590 
591         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
592             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
593                 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
594                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
595         }
596 
597         /* verify the payload remainder */
598         if (ctx->tx_remainder >= ctx->tx_modulus) {
599                 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
600                 ctx->tx_remainder = 0;
601         }
602 
603         /* adjust TX-remainder according to NCM specification. */
604         ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
605                              (ctx->tx_modulus - 1));
606 }
607 
608 static int cdc_ncm_setup(struct usbnet *dev)
609 {
610         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
611         u32 def_rx, def_tx;
612 
613         /* be conservative when selecting intial buffer size to
614          * increase the number of hosts this will work for
615          */
616         def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
617                        le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
618         def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
619                        le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
620 
621         /* clamp rx_max and tx_max and inform device */
622         cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
623 
624         /* sanitize the modulus and remainder values */
625         cdc_ncm_fix_modulus(dev);
626 
627         /* set max datagram size */
628         cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
629         return 0;
630 }
631 
632 static void
633 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
634 {
635         struct usb_host_endpoint *e, *in = NULL, *out = NULL;
636         u8 ep;
637 
638         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
639 
640                 e = intf->cur_altsetting->endpoint + ep;
641                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
642                 case USB_ENDPOINT_XFER_INT:
643                         if (usb_endpoint_dir_in(&e->desc)) {
644                                 if (!dev->status)
645                                         dev->status = e;
646                         }
647                         break;
648 
649                 case USB_ENDPOINT_XFER_BULK:
650                         if (usb_endpoint_dir_in(&e->desc)) {
651                                 if (!in)
652                                         in = e;
653                         } else {
654                                 if (!out)
655                                         out = e;
656                         }
657                         break;
658 
659                 default:
660                         break;
661                 }
662         }
663         if (in && !dev->in)
664                 dev->in = usb_rcvbulkpipe(dev->udev,
665                                           in->desc.bEndpointAddress &
666                                           USB_ENDPOINT_NUMBER_MASK);
667         if (out && !dev->out)
668                 dev->out = usb_sndbulkpipe(dev->udev,
669                                            out->desc.bEndpointAddress &
670                                            USB_ENDPOINT_NUMBER_MASK);
671 }
672 
673 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
674 {
675         if (ctx == NULL)
676                 return;
677 
678         if (ctx->tx_rem_skb != NULL) {
679                 dev_kfree_skb_any(ctx->tx_rem_skb);
680                 ctx->tx_rem_skb = NULL;
681         }
682 
683         if (ctx->tx_curr_skb != NULL) {
684                 dev_kfree_skb_any(ctx->tx_curr_skb);
685                 ctx->tx_curr_skb = NULL;
686         }
687 
688         kfree(ctx->delayed_ndp16);
689 
690         kfree(ctx);
691 }
692 
693 /* we need to override the usbnet change_mtu ndo for two reasons:
694  *  - respect the negotiated maximum datagram size
695  *  - avoid unwanted changes to rx and tx buffers
696  */
697 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
698 {
699         struct usbnet *dev = netdev_priv(net);
700         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
701         int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
702 
703         if (new_mtu <= 0 || new_mtu > maxmtu)
704                 return -EINVAL;
705         net->mtu = new_mtu;
706         return 0;
707 }
708 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
709 
710 static const struct net_device_ops cdc_ncm_netdev_ops = {
711         .ndo_open            = usbnet_open,
712         .ndo_stop            = usbnet_stop,
713         .ndo_start_xmit      = usbnet_start_xmit,
714         .ndo_tx_timeout      = usbnet_tx_timeout,
715         .ndo_change_mtu      = cdc_ncm_change_mtu,
716         .ndo_set_mac_address = eth_mac_addr,
717         .ndo_validate_addr   = eth_validate_addr,
718 };
719 
720 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
721 {
722         struct cdc_ncm_ctx *ctx;
723         struct usb_driver *driver;
724         u8 *buf;
725         int len;
726         int temp;
727         u8 iface_no;
728         struct usb_cdc_parsed_header hdr;
729 
730         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
731         if (!ctx)
732                 return -ENOMEM;
733 
734         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
735         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
736         ctx->bh.data = (unsigned long)dev;
737         ctx->bh.func = cdc_ncm_txpath_bh;
738         atomic_set(&ctx->stop, 0);
739         spin_lock_init(&ctx->mtx);
740 
741         /* store ctx pointer in device data field */
742         dev->data[0] = (unsigned long)ctx;
743 
744         /* only the control interface can be successfully probed */
745         ctx->control = intf;
746 
747         /* get some pointers */
748         driver = driver_of(intf);
749         buf = intf->cur_altsetting->extra;
750         len = intf->cur_altsetting->extralen;
751 
752         /* parse through descriptors associated with control interface */
753         cdc_parse_cdc_header(&hdr, intf, buf, len);
754 
755         if (hdr.usb_cdc_union_desc)
756                 ctx->data = usb_ifnum_to_if(dev->udev,
757                                             hdr.usb_cdc_union_desc->bSlaveInterface0);
758         ctx->ether_desc = hdr.usb_cdc_ether_desc;
759         ctx->func_desc = hdr.usb_cdc_ncm_desc;
760         ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
761         ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
762 
763         /* some buggy devices have an IAD but no CDC Union */
764         if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
765                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
766                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
767         }
768 
769         /* check if we got everything */
770         if (!ctx->data) {
771                 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
772                 goto error;
773         }
774         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
775                 if (!ctx->mbim_desc) {
776                         dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
777                         goto error;
778                 }
779         } else {
780                 if (!ctx->ether_desc || !ctx->func_desc) {
781                         dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
782                         goto error;
783                 }
784         }
785 
786         /* claim data interface, if different from control */
787         if (ctx->data != ctx->control) {
788                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
789                 if (temp) {
790                         dev_dbg(&intf->dev, "failed to claim data intf\n");
791                         goto error;
792                 }
793         }
794 
795         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
796 
797         /* reset data interface */
798         temp = usb_set_interface(dev->udev, iface_no, 0);
799         if (temp) {
800                 dev_dbg(&intf->dev, "set interface failed\n");
801                 goto error2;
802         }
803 
804         /* initialize basic device settings */
805         if (cdc_ncm_init(dev))
806                 goto error2;
807 
808         /* configure data interface */
809         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
810         if (temp) {
811                 dev_dbg(&intf->dev, "set interface failed\n");
812                 goto error2;
813         }
814 
815         cdc_ncm_find_endpoints(dev, ctx->data);
816         cdc_ncm_find_endpoints(dev, ctx->control);
817         if (!dev->in || !dev->out || !dev->status) {
818                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
819                 goto error2;
820         }
821 
822         usb_set_intfdata(ctx->data, dev);
823         usb_set_intfdata(ctx->control, dev);
824 
825         if (ctx->ether_desc) {
826                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
827                 if (temp) {
828                         dev_dbg(&intf->dev, "failed to get mac address\n");
829                         goto error2;
830                 }
831                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
832         }
833 
834         /* finish setting up the device specific data */
835         cdc_ncm_setup(dev);
836 
837         /* Device-specific flags */
838         ctx->drvflags = drvflags;
839 
840         /* Allocate the delayed NDP if needed. */
841         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
842                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
843                 if (!ctx->delayed_ndp16)
844                         goto error2;
845                 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
846         }
847 
848         /* override ethtool_ops */
849         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
850 
851         /* add our sysfs attrs */
852         dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
853 
854         /* must handle MTU changes */
855         dev->net->netdev_ops = &cdc_ncm_netdev_ops;
856 
857         return 0;
858 
859 error2:
860         usb_set_intfdata(ctx->control, NULL);
861         usb_set_intfdata(ctx->data, NULL);
862         if (ctx->data != ctx->control)
863                 usb_driver_release_interface(driver, ctx->data);
864 error:
865         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
866         dev->data[0] = 0;
867         dev_info(&intf->dev, "bind() failure\n");
868         return -ENODEV;
869 }
870 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
871 
872 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
873 {
874         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
875         struct usb_driver *driver = driver_of(intf);
876 
877         if (ctx == NULL)
878                 return;         /* no setup */
879 
880         atomic_set(&ctx->stop, 1);
881 
882         if (hrtimer_active(&ctx->tx_timer))
883                 hrtimer_cancel(&ctx->tx_timer);
884 
885         tasklet_kill(&ctx->bh);
886 
887         /* handle devices with combined control and data interface */
888         if (ctx->control == ctx->data)
889                 ctx->data = NULL;
890 
891         /* disconnect master --> disconnect slave */
892         if (intf == ctx->control && ctx->data) {
893                 usb_set_intfdata(ctx->data, NULL);
894                 usb_driver_release_interface(driver, ctx->data);
895                 ctx->data = NULL;
896 
897         } else if (intf == ctx->data && ctx->control) {
898                 usb_set_intfdata(ctx->control, NULL);
899                 usb_driver_release_interface(driver, ctx->control);
900                 ctx->control = NULL;
901         }
902 
903         usb_set_intfdata(intf, NULL);
904         cdc_ncm_free(ctx);
905 }
906 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
907 
908 /* Return the number of the MBIM control interface altsetting iff it
909  * is preferred and available,
910  */
911 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
912 {
913         struct usb_host_interface *alt;
914 
915         /* The MBIM spec defines a NCM compatible default altsetting,
916          * which we may have matched:
917          *
918          *  "Functions that implement both NCM 1.0 and MBIM (an
919          *   “NCM/MBIM function”) according to this recommendation
920          *   shall provide two alternate settings for the
921          *   Communication Interface.  Alternate setting 0, and the
922          *   associated class and endpoint descriptors, shall be
923          *   constructed according to the rules given for the
924          *   Communication Interface in section 5 of [USBNCM10].
925          *   Alternate setting 1, and the associated class and
926          *   endpoint descriptors, shall be constructed according to
927          *   the rules given in section 6 (USB Device Model) of this
928          *   specification."
929          */
930         if (intf->num_altsetting < 2)
931                 return intf->cur_altsetting->desc.bAlternateSetting;
932 
933         if (prefer_mbim) {
934                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
935                 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
936                         return CDC_NCM_COMM_ALTSETTING_MBIM;
937         }
938         return CDC_NCM_COMM_ALTSETTING_NCM;
939 }
940 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
941 
942 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
943 {
944         int ret;
945 
946         /* MBIM backwards compatible function? */
947         if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
948                 return -ENODEV;
949 
950         /* The NCM data altsetting is fixed, so we hard-coded it.
951          * Additionally, generic NCM devices are assumed to accept arbitrarily
952          * placed NDP.
953          */
954         ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
955 
956         /*
957          * We should get an event when network connection is "connected" or
958          * "disconnected". Set network connection in "disconnected" state
959          * (carrier is OFF) during attach, so the IP network stack does not
960          * start IPv6 negotiation and more.
961          */
962         usbnet_link_change(dev, 0, 0);
963         return ret;
964 }
965 
966 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
967 {
968         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
969 
970         if (skb->len + align > max)
971                 align = max - skb->len;
972         if (align && skb_tailroom(skb) >= align)
973                 memset(skb_put(skb, align), 0, align);
974 }
975 
976 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
977  * allocating a new one within skb
978  */
979 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
980 {
981         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
982         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
983         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
984 
985         /* If NDP should be moved to the end of the NCM package, we can't follow the
986         * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
987         * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
988         */
989         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
990                 if (ctx->delayed_ndp16->dwSignature == sign)
991                         return ctx->delayed_ndp16;
992 
993                 /* We can only push a single NDP to the end. Return
994                  * NULL to send what we've already got and queue this
995                  * skb for later.
996                  */
997                 else if (ctx->delayed_ndp16->dwSignature)
998                         return NULL;
999         }
1000 
1001         /* follow the chain of NDPs, looking for a match */
1002         while (ndpoffset) {
1003                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1004                 if  (ndp16->dwSignature == sign)
1005                         return ndp16;
1006                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1007         }
1008 
1009         /* align new NDP */
1010         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1011                 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1012 
1013         /* verify that there is room for the NDP and the datagram (reserve) */
1014         if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1015                 return NULL;
1016 
1017         /* link to it */
1018         if (ndp16)
1019                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1020         else
1021                 nth16->wNdpIndex = cpu_to_le16(skb->len);
1022 
1023         /* push a new empty NDP */
1024         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1025                 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1026         else
1027                 ndp16 = ctx->delayed_ndp16;
1028 
1029         ndp16->dwSignature = sign;
1030         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1031         return ndp16;
1032 }
1033 
1034 struct sk_buff *
1035 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1036 {
1037         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1038         struct usb_cdc_ncm_nth16 *nth16;
1039         struct usb_cdc_ncm_ndp16 *ndp16;
1040         struct sk_buff *skb_out;
1041         u16 n = 0, index, ndplen;
1042         u8 ready2send = 0;
1043         u32 delayed_ndp_size;
1044 
1045         /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1046          * accordingly. Otherwise, we should check here.
1047          */
1048         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1049                 delayed_ndp_size = ctx->max_ndp_size;
1050         else
1051                 delayed_ndp_size = 0;
1052 
1053         /* if there is a remaining skb, it gets priority */
1054         if (skb != NULL) {
1055                 swap(skb, ctx->tx_rem_skb);
1056                 swap(sign, ctx->tx_rem_sign);
1057         } else {
1058                 ready2send = 1;
1059         }
1060 
1061         /* check if we are resuming an OUT skb */
1062         skb_out = ctx->tx_curr_skb;
1063 
1064         /* allocate a new OUT skb */
1065         if (!skb_out) {
1066                 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1067                 if (skb_out == NULL) {
1068                         if (skb != NULL) {
1069                                 dev_kfree_skb_any(skb);
1070                                 dev->net->stats.tx_dropped++;
1071                         }
1072                         goto exit_no_skb;
1073                 }
1074                 /* fill out the initial 16-bit NTB header */
1075                 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1076                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1077                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1078                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1079 
1080                 /* count total number of frames in this NTB */
1081                 ctx->tx_curr_frame_num = 0;
1082 
1083                 /* recent payload counter for this skb_out */
1084                 ctx->tx_curr_frame_payload = 0;
1085         }
1086 
1087         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1088                 /* send any remaining skb first */
1089                 if (skb == NULL) {
1090                         skb = ctx->tx_rem_skb;
1091                         sign = ctx->tx_rem_sign;
1092                         ctx->tx_rem_skb = NULL;
1093 
1094                         /* check for end of skb */
1095                         if (skb == NULL)
1096                                 break;
1097                 }
1098 
1099                 /* get the appropriate NDP for this skb */
1100                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1101 
1102                 /* align beginning of next frame */
1103                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1104 
1105                 /* check if we had enough room left for both NDP and frame */
1106                 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1107                         if (n == 0) {
1108                                 /* won't fit, MTU problem? */
1109                                 dev_kfree_skb_any(skb);
1110                                 skb = NULL;
1111                                 dev->net->stats.tx_dropped++;
1112                         } else {
1113                                 /* no room for skb - store for later */
1114                                 if (ctx->tx_rem_skb != NULL) {
1115                                         dev_kfree_skb_any(ctx->tx_rem_skb);
1116                                         dev->net->stats.tx_dropped++;
1117                                 }
1118                                 ctx->tx_rem_skb = skb;
1119                                 ctx->tx_rem_sign = sign;
1120                                 skb = NULL;
1121                                 ready2send = 1;
1122                                 ctx->tx_reason_ntb_full++;      /* count reason for transmitting */
1123                         }
1124                         break;
1125                 }
1126 
1127                 /* calculate frame number withing this NDP */
1128                 ndplen = le16_to_cpu(ndp16->wLength);
1129                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1130 
1131                 /* OK, add this skb */
1132                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1133                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1134                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1135                 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1136                 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1137                 dev_kfree_skb_any(skb);
1138                 skb = NULL;
1139 
1140                 /* send now if this NDP is full */
1141                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1142                         ready2send = 1;
1143                         ctx->tx_reason_ndp_full++;      /* count reason for transmitting */
1144                         break;
1145                 }
1146         }
1147 
1148         /* free up any dangling skb */
1149         if (skb != NULL) {
1150                 dev_kfree_skb_any(skb);
1151                 skb = NULL;
1152                 dev->net->stats.tx_dropped++;
1153         }
1154 
1155         ctx->tx_curr_frame_num = n;
1156 
1157         if (n == 0) {
1158                 /* wait for more frames */
1159                 /* push variables */
1160                 ctx->tx_curr_skb = skb_out;
1161                 goto exit_no_skb;
1162 
1163         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1164                 /* wait for more frames */
1165                 /* push variables */
1166                 ctx->tx_curr_skb = skb_out;
1167                 /* set the pending count */
1168                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1169                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1170                 goto exit_no_skb;
1171 
1172         } else {
1173                 if (n == ctx->tx_max_datagrams)
1174                         ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1175                 /* frame goes out */
1176                 /* variables will be reset at next call */
1177         }
1178 
1179         /* If requested, put NDP at end of frame. */
1180         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1181                 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1182                 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1183                 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1184                 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1185 
1186                 /* Zero out delayed NDP - signature checking will naturally fail. */
1187                 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1188         }
1189 
1190         /* If collected data size is less or equal ctx->min_tx_pkt
1191          * bytes, we send buffers as it is. If we get more data, it
1192          * would be more efficient for USB HS mobile device with DMA
1193          * engine to receive a full size NTB, than canceling DMA
1194          * transfer and receiving a short packet.
1195          *
1196          * This optimization support is pointless if we end up sending
1197          * a ZLP after full sized NTBs.
1198          */
1199         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1200             skb_out->len > ctx->min_tx_pkt)
1201                 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1202                        ctx->tx_max - skb_out->len);
1203         else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1204                 *skb_put(skb_out, 1) = 0;       /* force short packet */
1205 
1206         /* set final frame length */
1207         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1208         nth16->wBlockLength = cpu_to_le16(skb_out->len);
1209 
1210         /* return skb */
1211         ctx->tx_curr_skb = NULL;
1212 
1213         /* keep private stats: framing overhead and number of NTBs */
1214         ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1215         ctx->tx_ntbs++;
1216 
1217         /* usbnet will count all the framing overhead by default.
1218          * Adjust the stats so that the tx_bytes counter show real
1219          * payload data instead.
1220          */
1221         usbnet_set_skb_tx_stats(skb_out, n,
1222                                 (long)ctx->tx_curr_frame_payload - skb_out->len);
1223 
1224         return skb_out;
1225 
1226 exit_no_skb:
1227         /* Start timer, if there is a remaining non-empty skb */
1228         if (ctx->tx_curr_skb != NULL && n > 0)
1229                 cdc_ncm_tx_timeout_start(ctx);
1230         return NULL;
1231 }
1232 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1233 
1234 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1235 {
1236         /* start timer, if not already started */
1237         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1238                 hrtimer_start(&ctx->tx_timer,
1239                                 ktime_set(0, ctx->timer_interval),
1240                                 HRTIMER_MODE_REL);
1241 }
1242 
1243 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1244 {
1245         struct cdc_ncm_ctx *ctx =
1246                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
1247 
1248         if (!atomic_read(&ctx->stop))
1249                 tasklet_schedule(&ctx->bh);
1250         return HRTIMER_NORESTART;
1251 }
1252 
1253 static void cdc_ncm_txpath_bh(unsigned long param)
1254 {
1255         struct usbnet *dev = (struct usbnet *)param;
1256         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1257 
1258         spin_lock_bh(&ctx->mtx);
1259         if (ctx->tx_timer_pending != 0) {
1260                 ctx->tx_timer_pending--;
1261                 cdc_ncm_tx_timeout_start(ctx);
1262                 spin_unlock_bh(&ctx->mtx);
1263         } else if (dev->net != NULL) {
1264                 ctx->tx_reason_timeout++;       /* count reason for transmitting */
1265                 spin_unlock_bh(&ctx->mtx);
1266                 netif_tx_lock_bh(dev->net);
1267                 usbnet_start_xmit(NULL, dev->net);
1268                 netif_tx_unlock_bh(dev->net);
1269         } else {
1270                 spin_unlock_bh(&ctx->mtx);
1271         }
1272 }
1273 
1274 struct sk_buff *
1275 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1276 {
1277         struct sk_buff *skb_out;
1278         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1279 
1280         /*
1281          * The Ethernet API we are using does not support transmitting
1282          * multiple Ethernet frames in a single call. This driver will
1283          * accumulate multiple Ethernet frames and send out a larger
1284          * USB frame when the USB buffer is full or when a single jiffies
1285          * timeout happens.
1286          */
1287         if (ctx == NULL)
1288                 goto error;
1289 
1290         spin_lock_bh(&ctx->mtx);
1291         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1292         spin_unlock_bh(&ctx->mtx);
1293         return skb_out;
1294 
1295 error:
1296         if (skb != NULL)
1297                 dev_kfree_skb_any(skb);
1298 
1299         return NULL;
1300 }
1301 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1302 
1303 /* verify NTB header and return offset of first NDP, or negative error */
1304 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1305 {
1306         struct usbnet *dev = netdev_priv(skb_in->dev);
1307         struct usb_cdc_ncm_nth16 *nth16;
1308         int len;
1309         int ret = -EINVAL;
1310 
1311         if (ctx == NULL)
1312                 goto error;
1313 
1314         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1315                                         sizeof(struct usb_cdc_ncm_ndp16))) {
1316                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1317                 goto error;
1318         }
1319 
1320         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1321 
1322         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1323                 netif_dbg(dev, rx_err, dev->net,
1324                           "invalid NTH16 signature <%#010x>\n",
1325                           le32_to_cpu(nth16->dwSignature));
1326                 goto error;
1327         }
1328 
1329         len = le16_to_cpu(nth16->wBlockLength);
1330         if (len > ctx->rx_max) {
1331                 netif_dbg(dev, rx_err, dev->net,
1332                           "unsupported NTB block length %u/%u\n", len,
1333                           ctx->rx_max);
1334                 goto error;
1335         }
1336 
1337         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1338             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1339             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1340                 netif_dbg(dev, rx_err, dev->net,
1341                           "sequence number glitch prev=%d curr=%d\n",
1342                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1343         }
1344         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1345 
1346         ret = le16_to_cpu(nth16->wNdpIndex);
1347 error:
1348         return ret;
1349 }
1350 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1351 
1352 /* verify NDP header and return number of datagrams, or negative error */
1353 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1354 {
1355         struct usbnet *dev = netdev_priv(skb_in->dev);
1356         struct usb_cdc_ncm_ndp16 *ndp16;
1357         int ret = -EINVAL;
1358 
1359         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1360                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1361                           ndpoffset);
1362                 goto error;
1363         }
1364         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1365 
1366         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1367                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1368                           le16_to_cpu(ndp16->wLength));
1369                 goto error;
1370         }
1371 
1372         ret = ((le16_to_cpu(ndp16->wLength) -
1373                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1374                                         sizeof(struct usb_cdc_ncm_dpe16));
1375         ret--; /* we process NDP entries except for the last one */
1376 
1377         if ((sizeof(struct usb_cdc_ncm_ndp16) +
1378              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1379                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1380                 ret = -EINVAL;
1381         }
1382 
1383 error:
1384         return ret;
1385 }
1386 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1387 
1388 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1389 {
1390         struct sk_buff *skb;
1391         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1392         int len;
1393         int nframes;
1394         int x;
1395         int offset;
1396         struct usb_cdc_ncm_ndp16 *ndp16;
1397         struct usb_cdc_ncm_dpe16 *dpe16;
1398         int ndpoffset;
1399         int loopcount = 50; /* arbitrary max preventing infinite loop */
1400         u32 payload = 0;
1401 
1402         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1403         if (ndpoffset < 0)
1404                 goto error;
1405 
1406 next_ndp:
1407         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1408         if (nframes < 0)
1409                 goto error;
1410 
1411         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1412 
1413         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1414                 netif_dbg(dev, rx_err, dev->net,
1415                           "invalid DPT16 signature <%#010x>\n",
1416                           le32_to_cpu(ndp16->dwSignature));
1417                 goto err_ndp;
1418         }
1419         dpe16 = ndp16->dpe16;
1420 
1421         for (x = 0; x < nframes; x++, dpe16++) {
1422                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1423                 len = le16_to_cpu(dpe16->wDatagramLength);
1424 
1425                 /*
1426                  * CDC NCM ch. 3.7
1427                  * All entries after first NULL entry are to be ignored
1428                  */
1429                 if ((offset == 0) || (len == 0)) {
1430                         if (!x)
1431                                 goto err_ndp; /* empty NTB */
1432                         break;
1433                 }
1434 
1435                 /* sanity checking */
1436                 if (((offset + len) > skb_in->len) ||
1437                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1438                         netif_dbg(dev, rx_err, dev->net,
1439                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1440                                   x, offset, len, skb_in);
1441                         if (!x)
1442                                 goto err_ndp;
1443                         break;
1444 
1445                 } else {
1446                         /* create a fresh copy to reduce truesize */
1447                         skb = netdev_alloc_skb_ip_align(dev->net,  len);
1448                         if (!skb)
1449                                 goto error;
1450                         memcpy(skb_put(skb, len), skb_in->data + offset, len);
1451                         usbnet_skb_return(dev, skb);
1452                         payload += len; /* count payload bytes in this NTB */
1453                 }
1454         }
1455 err_ndp:
1456         /* are there more NDPs to process? */
1457         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1458         if (ndpoffset && loopcount--)
1459                 goto next_ndp;
1460 
1461         /* update stats */
1462         ctx->rx_overhead += skb_in->len - payload;
1463         ctx->rx_ntbs++;
1464 
1465         return 1;
1466 error:
1467         return 0;
1468 }
1469 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1470 
1471 static void
1472 cdc_ncm_speed_change(struct usbnet *dev,
1473                      struct usb_cdc_speed_change *data)
1474 {
1475         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1476         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1477 
1478         /*
1479          * Currently the USB-NET API does not support reporting the actual
1480          * device speed. Do print it instead.
1481          */
1482         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1483                 netif_info(dev, link, dev->net,
1484                            "%u mbit/s downlink %u mbit/s uplink\n",
1485                            (unsigned int)(rx_speed / 1000000U),
1486                            (unsigned int)(tx_speed / 1000000U));
1487         } else {
1488                 netif_info(dev, link, dev->net,
1489                            "%u kbit/s downlink %u kbit/s uplink\n",
1490                            (unsigned int)(rx_speed / 1000U),
1491                            (unsigned int)(tx_speed / 1000U));
1492         }
1493 }
1494 
1495 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1496 {
1497         struct cdc_ncm_ctx *ctx;
1498         struct usb_cdc_notification *event;
1499 
1500         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1501 
1502         if (urb->actual_length < sizeof(*event))
1503                 return;
1504 
1505         /* test for split data in 8-byte chunks */
1506         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1507                 cdc_ncm_speed_change(dev,
1508                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1509                 return;
1510         }
1511 
1512         event = urb->transfer_buffer;
1513 
1514         switch (event->bNotificationType) {
1515         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1516                 /*
1517                  * According to the CDC NCM specification ch.7.1
1518                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1519                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1520                  */
1521                 netif_info(dev, link, dev->net,
1522                            "network connection: %sconnected\n",
1523                            !!event->wValue ? "" : "dis");
1524                 usbnet_link_change(dev, !!event->wValue, 0);
1525                 break;
1526 
1527         case USB_CDC_NOTIFY_SPEED_CHANGE:
1528                 if (urb->actual_length < (sizeof(*event) +
1529                                         sizeof(struct usb_cdc_speed_change)))
1530                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1531                 else
1532                         cdc_ncm_speed_change(dev,
1533                                              (struct usb_cdc_speed_change *)&event[1]);
1534                 break;
1535 
1536         default:
1537                 dev_dbg(&dev->udev->dev,
1538                         "NCM: unexpected notification 0x%02x!\n",
1539                         event->bNotificationType);
1540                 break;
1541         }
1542 }
1543 
1544 static const struct driver_info cdc_ncm_info = {
1545         .description = "CDC NCM",
1546         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1547         .bind = cdc_ncm_bind,
1548         .unbind = cdc_ncm_unbind,
1549         .manage_power = usbnet_manage_power,
1550         .status = cdc_ncm_status,
1551         .rx_fixup = cdc_ncm_rx_fixup,
1552         .tx_fixup = cdc_ncm_tx_fixup,
1553 };
1554 
1555 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1556 static const struct driver_info wwan_info = {
1557         .description = "Mobile Broadband Network Device",
1558         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1559                         | FLAG_WWAN,
1560         .bind = cdc_ncm_bind,
1561         .unbind = cdc_ncm_unbind,
1562         .manage_power = usbnet_manage_power,
1563         .status = cdc_ncm_status,
1564         .rx_fixup = cdc_ncm_rx_fixup,
1565         .tx_fixup = cdc_ncm_tx_fixup,
1566 };
1567 
1568 /* Same as wwan_info, but with FLAG_NOARP  */
1569 static const struct driver_info wwan_noarp_info = {
1570         .description = "Mobile Broadband Network Device (NO ARP)",
1571         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1572                         | FLAG_WWAN | FLAG_NOARP,
1573         .bind = cdc_ncm_bind,
1574         .unbind = cdc_ncm_unbind,
1575         .manage_power = usbnet_manage_power,
1576         .status = cdc_ncm_status,
1577         .rx_fixup = cdc_ncm_rx_fixup,
1578         .tx_fixup = cdc_ncm_tx_fixup,
1579 };
1580 
1581 static const struct usb_device_id cdc_devs[] = {
1582         /* Ericsson MBM devices like F5521gw */
1583         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1584                 | USB_DEVICE_ID_MATCH_VENDOR,
1585           .idVendor = 0x0bdb,
1586           .bInterfaceClass = USB_CLASS_COMM,
1587           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1588           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1589           .driver_info = (unsigned long) &wwan_info,
1590         },
1591 
1592         /* DW5812 LTE Verizon Mobile Broadband Card
1593          * Unlike DW5550 this device requires FLAG_NOARP
1594          */
1595         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1596                 USB_CLASS_COMM,
1597                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1598           .driver_info = (unsigned long)&wwan_noarp_info,
1599         },
1600 
1601         /* DW5813 LTE AT&T Mobile Broadband Card
1602          * Unlike DW5550 this device requires FLAG_NOARP
1603          */
1604         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1605                 USB_CLASS_COMM,
1606                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1607           .driver_info = (unsigned long)&wwan_noarp_info,
1608         },
1609 
1610         /* Dell branded MBM devices like DW5550 */
1611         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1612                 | USB_DEVICE_ID_MATCH_VENDOR,
1613           .idVendor = 0x413c,
1614           .bInterfaceClass = USB_CLASS_COMM,
1615           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1616           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1617           .driver_info = (unsigned long) &wwan_info,
1618         },
1619 
1620         /* Toshiba branded MBM devices */
1621         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1622                 | USB_DEVICE_ID_MATCH_VENDOR,
1623           .idVendor = 0x0930,
1624           .bInterfaceClass = USB_CLASS_COMM,
1625           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1626           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1627           .driver_info = (unsigned long) &wwan_info,
1628         },
1629 
1630         /* tag Huawei devices as wwan */
1631         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1632                                         USB_CLASS_COMM,
1633                                         USB_CDC_SUBCLASS_NCM,
1634                                         USB_CDC_PROTO_NONE),
1635           .driver_info = (unsigned long)&wwan_info,
1636         },
1637 
1638         /* Infineon(now Intel) HSPA Modem platform */
1639         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1640                 USB_CLASS_COMM,
1641                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1642           .driver_info = (unsigned long)&wwan_noarp_info,
1643         },
1644 
1645         /* Generic CDC-NCM devices */
1646         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1647                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1648                 .driver_info = (unsigned long)&cdc_ncm_info,
1649         },
1650         {
1651         },
1652 };
1653 MODULE_DEVICE_TABLE(usb, cdc_devs);
1654 
1655 static struct usb_driver cdc_ncm_driver = {
1656         .name = "cdc_ncm",
1657         .id_table = cdc_devs,
1658         .probe = usbnet_probe,
1659         .disconnect = usbnet_disconnect,
1660         .suspend = usbnet_suspend,
1661         .resume = usbnet_resume,
1662         .reset_resume = usbnet_resume,
1663         .supports_autosuspend = 1,
1664         .disable_hub_initiated_lpm = 1,
1665 };
1666 
1667 module_usb_driver(cdc_ncm_driver);
1668 
1669 MODULE_AUTHOR("Hans Petter Selasky");
1670 MODULE_DESCRIPTION("USB CDC NCM host driver");
1671 MODULE_LICENSE("Dual BSD/GPL");
1672 

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