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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 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
288 {
289         struct usbnet *dev = netdev_priv(to_net_dev(d));
290         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
291 
292         return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
293 }
294 
295 static ssize_t ndp_to_end_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
296 {
297         struct usbnet *dev = netdev_priv(to_net_dev(d));
298         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
299         bool enable;
300 
301         if (strtobool(buf, &enable))
302                 return -EINVAL;
303 
304         /* no change? */
305         if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
306                 return len;
307 
308         if (enable && !ctx->delayed_ndp16) {
309                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
310                 if (!ctx->delayed_ndp16)
311                         return -ENOMEM;
312         }
313 
314         /* flush pending data before changing flag */
315         netif_tx_lock_bh(dev->net);
316         usbnet_start_xmit(NULL, dev->net);
317         spin_lock_bh(&ctx->mtx);
318         if (enable)
319                 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
320         else
321                 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
322         spin_unlock_bh(&ctx->mtx);
323         netif_tx_unlock_bh(dev->net);
324 
325         return len;
326 }
327 static DEVICE_ATTR_RW(ndp_to_end);
328 
329 #define NCM_PARM_ATTR(name, format, tocpu)                              \
330 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
331 { \
332         struct usbnet *dev = netdev_priv(to_net_dev(d)); \
333         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
334         return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));    \
335 } \
336 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
337 
338 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
339 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
340 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
341 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
342 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
343 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
344 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
345 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
346 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
347 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
348 
349 static struct attribute *cdc_ncm_sysfs_attrs[] = {
350         &dev_attr_min_tx_pkt.attr,
351         &dev_attr_ndp_to_end.attr,
352         &dev_attr_rx_max.attr,
353         &dev_attr_tx_max.attr,
354         &dev_attr_tx_timer_usecs.attr,
355         &dev_attr_bmNtbFormatsSupported.attr,
356         &dev_attr_dwNtbInMaxSize.attr,
357         &dev_attr_wNdpInDivisor.attr,
358         &dev_attr_wNdpInPayloadRemainder.attr,
359         &dev_attr_wNdpInAlignment.attr,
360         &dev_attr_dwNtbOutMaxSize.attr,
361         &dev_attr_wNdpOutDivisor.attr,
362         &dev_attr_wNdpOutPayloadRemainder.attr,
363         &dev_attr_wNdpOutAlignment.attr,
364         &dev_attr_wNtbOutMaxDatagrams.attr,
365         NULL,
366 };
367 
368 static struct attribute_group cdc_ncm_sysfs_attr_group = {
369         .name = "cdc_ncm",
370         .attrs = cdc_ncm_sysfs_attrs,
371 };
372 
373 /* handle rx_max and tx_max changes */
374 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
375 {
376         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
377         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
378         u32 val;
379 
380         val = cdc_ncm_check_rx_max(dev, new_rx);
381 
382         /* inform device about NTB input size changes */
383         if (val != ctx->rx_max) {
384                 __le32 dwNtbInMaxSize = cpu_to_le32(val);
385 
386                 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
387 
388                 /* tell device to use new size */
389                 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
390                                      USB_TYPE_CLASS | USB_DIR_OUT
391                                      | USB_RECIP_INTERFACE,
392                                      0, iface_no, &dwNtbInMaxSize, 4) < 0)
393                         dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
394                 else
395                         ctx->rx_max = val;
396         }
397 
398         /* usbnet use these values for sizing rx queues */
399         if (dev->rx_urb_size != ctx->rx_max) {
400                 dev->rx_urb_size = ctx->rx_max;
401                 if (netif_running(dev->net))
402                         usbnet_unlink_rx_urbs(dev);
403         }
404 
405         val = cdc_ncm_check_tx_max(dev, new_tx);
406         if (val != ctx->tx_max)
407                 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
408 
409         /* Adding a pad byte here if necessary simplifies the handling
410          * in cdc_ncm_fill_tx_frame, making tx_max always represent
411          * the real skb max size.
412          *
413          * We cannot use dev->maxpacket here because this is called from
414          * .bind which is called before usbnet sets up dev->maxpacket
415          */
416         if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
417             val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
418                 val++;
419 
420         /* we might need to flush any pending tx buffers if running */
421         if (netif_running(dev->net) && val > ctx->tx_max) {
422                 netif_tx_lock_bh(dev->net);
423                 usbnet_start_xmit(NULL, dev->net);
424                 /* make sure tx_curr_skb is reallocated if it was empty */
425                 if (ctx->tx_curr_skb) {
426                         dev_kfree_skb_any(ctx->tx_curr_skb);
427                         ctx->tx_curr_skb = NULL;
428                 }
429                 ctx->tx_max = val;
430                 netif_tx_unlock_bh(dev->net);
431         } else {
432                 ctx->tx_max = val;
433         }
434 
435         dev->hard_mtu = ctx->tx_max;
436 
437         /* max qlen depend on hard_mtu and rx_urb_size */
438         usbnet_update_max_qlen(dev);
439 
440         /* never pad more than 3 full USB packets per transfer */
441         ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
442                                   CDC_NCM_MIN_TX_PKT, ctx->tx_max);
443 }
444 
445 /* helpers for NCM and MBIM differences */
446 static u8 cdc_ncm_flags(struct usbnet *dev)
447 {
448         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
449 
450         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
451                 return ctx->mbim_desc->bmNetworkCapabilities;
452         if (ctx->func_desc)
453                 return ctx->func_desc->bmNetworkCapabilities;
454         return 0;
455 }
456 
457 static int cdc_ncm_eth_hlen(struct usbnet *dev)
458 {
459         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
460                 return 0;
461         return ETH_HLEN;
462 }
463 
464 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
465 {
466         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
467                 return CDC_MBIM_MIN_DATAGRAM_SIZE;
468         return CDC_NCM_MIN_DATAGRAM_SIZE;
469 }
470 
471 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
472 {
473         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
474 
475         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
476                 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
477         if (ctx->ether_desc)
478                 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
479         return CDC_NCM_MAX_DATAGRAM_SIZE;
480 }
481 
482 /* initial one-time device setup.  MUST be called with the data interface
483  * in altsetting 0
484  */
485 static int cdc_ncm_init(struct usbnet *dev)
486 {
487         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
488         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
489         int err;
490 
491         err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
492                               USB_TYPE_CLASS | USB_DIR_IN
493                               |USB_RECIP_INTERFACE,
494                               0, iface_no, &ctx->ncm_parm,
495                               sizeof(ctx->ncm_parm));
496         if (err < 0) {
497                 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
498                 return err; /* GET_NTB_PARAMETERS is required */
499         }
500 
501         /* set CRC Mode */
502         if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
503                 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
504                 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
505                                        USB_TYPE_CLASS | USB_DIR_OUT
506                                        | USB_RECIP_INTERFACE,
507                                        USB_CDC_NCM_CRC_NOT_APPENDED,
508                                        iface_no, NULL, 0);
509                 if (err < 0)
510                         dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
511         }
512 
513         /* set NTB format, if both formats are supported.
514          *
515          * "The host shall only send this command while the NCM Data
516          *  Interface is in alternate setting 0."
517          */
518         if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
519                                                 USB_CDC_NCM_NTB32_SUPPORTED) {
520                 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
521                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
522                                        USB_TYPE_CLASS | USB_DIR_OUT
523                                        | USB_RECIP_INTERFACE,
524                                        USB_CDC_NCM_NTB16_FORMAT,
525                                        iface_no, NULL, 0);
526                 if (err < 0)
527                         dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
528         }
529 
530         /* set initial device values */
531         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
532         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
533         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
534         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
535         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
536         /* devices prior to NCM Errata shall set this field to zero */
537         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
538 
539         dev_dbg(&dev->intf->dev,
540                 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
541                 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
542                 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
543 
544         /* max count of tx datagrams */
545         if ((ctx->tx_max_datagrams == 0) ||
546                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
547                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
548 
549         /* set up maximum NDP size */
550         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
551 
552         /* initial coalescing timer interval */
553         ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
554 
555         return 0;
556 }
557 
558 /* set a new max datagram size */
559 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
560 {
561         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
562         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
563         __le16 max_datagram_size;
564         u16 mbim_mtu;
565         int err;
566 
567         /* set default based on descriptors */
568         ctx->max_datagram_size = clamp_t(u32, new_size,
569                                          cdc_ncm_min_dgram_size(dev),
570                                          CDC_NCM_MAX_DATAGRAM_SIZE);
571 
572         /* inform the device about the selected Max Datagram Size? */
573         if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
574                 goto out;
575 
576         /* read current mtu value from device */
577         err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
578                               USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
579                               0, iface_no, &max_datagram_size, 2);
580         if (err < 0) {
581                 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
582                 goto out;
583         }
584 
585         if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
586                 goto out;
587 
588         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
589         err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
590                                USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
591                                0, iface_no, &max_datagram_size, 2);
592         if (err < 0)
593                 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
594 
595 out:
596         /* set MTU to max supported by the device if necessary */
597         dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
598 
599         /* do not exceed operater preferred MTU */
600         if (ctx->mbim_extended_desc) {
601                 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
602                 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
603                         dev->net->mtu = mbim_mtu;
604         }
605 }
606 
607 static void cdc_ncm_fix_modulus(struct usbnet *dev)
608 {
609         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
610         u32 val;
611 
612         /*
613          * verify that the structure alignment is:
614          * - power of two
615          * - not greater than the maximum transmit length
616          * - not less than four bytes
617          */
618         val = ctx->tx_ndp_modulus;
619 
620         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
621             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
622                 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
623                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
624         }
625 
626         /*
627          * verify that the payload alignment is:
628          * - power of two
629          * - not greater than the maximum transmit length
630          * - not less than four bytes
631          */
632         val = ctx->tx_modulus;
633 
634         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
635             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
636                 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
637                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
638         }
639 
640         /* verify the payload remainder */
641         if (ctx->tx_remainder >= ctx->tx_modulus) {
642                 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
643                 ctx->tx_remainder = 0;
644         }
645 
646         /* adjust TX-remainder according to NCM specification. */
647         ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
648                              (ctx->tx_modulus - 1));
649 }
650 
651 static int cdc_ncm_setup(struct usbnet *dev)
652 {
653         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
654         u32 def_rx, def_tx;
655 
656         /* be conservative when selecting intial buffer size to
657          * increase the number of hosts this will work for
658          */
659         def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
660                        le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
661         def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
662                        le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
663 
664         /* clamp rx_max and tx_max and inform device */
665         cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
666 
667         /* sanitize the modulus and remainder values */
668         cdc_ncm_fix_modulus(dev);
669 
670         /* set max datagram size */
671         cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
672         return 0;
673 }
674 
675 static void
676 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
677 {
678         struct usb_host_endpoint *e, *in = NULL, *out = NULL;
679         u8 ep;
680 
681         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
682 
683                 e = intf->cur_altsetting->endpoint + ep;
684                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
685                 case USB_ENDPOINT_XFER_INT:
686                         if (usb_endpoint_dir_in(&e->desc)) {
687                                 if (!dev->status)
688                                         dev->status = e;
689                         }
690                         break;
691 
692                 case USB_ENDPOINT_XFER_BULK:
693                         if (usb_endpoint_dir_in(&e->desc)) {
694                                 if (!in)
695                                         in = e;
696                         } else {
697                                 if (!out)
698                                         out = e;
699                         }
700                         break;
701 
702                 default:
703                         break;
704                 }
705         }
706         if (in && !dev->in)
707                 dev->in = usb_rcvbulkpipe(dev->udev,
708                                           in->desc.bEndpointAddress &
709                                           USB_ENDPOINT_NUMBER_MASK);
710         if (out && !dev->out)
711                 dev->out = usb_sndbulkpipe(dev->udev,
712                                            out->desc.bEndpointAddress &
713                                            USB_ENDPOINT_NUMBER_MASK);
714 }
715 
716 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
717 {
718         if (ctx == NULL)
719                 return;
720 
721         if (ctx->tx_rem_skb != NULL) {
722                 dev_kfree_skb_any(ctx->tx_rem_skb);
723                 ctx->tx_rem_skb = NULL;
724         }
725 
726         if (ctx->tx_curr_skb != NULL) {
727                 dev_kfree_skb_any(ctx->tx_curr_skb);
728                 ctx->tx_curr_skb = NULL;
729         }
730 
731         kfree(ctx->delayed_ndp16);
732 
733         kfree(ctx);
734 }
735 
736 /* we need to override the usbnet change_mtu ndo for two reasons:
737  *  - respect the negotiated maximum datagram size
738  *  - avoid unwanted changes to rx and tx buffers
739  */
740 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
741 {
742         struct usbnet *dev = netdev_priv(net);
743         int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
744 
745         if (new_mtu <= 0 || new_mtu > maxmtu)
746                 return -EINVAL;
747 
748         net->mtu = new_mtu;
749         cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
750 
751         return 0;
752 }
753 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
754 
755 static const struct net_device_ops cdc_ncm_netdev_ops = {
756         .ndo_open            = usbnet_open,
757         .ndo_stop            = usbnet_stop,
758         .ndo_start_xmit      = usbnet_start_xmit,
759         .ndo_tx_timeout      = usbnet_tx_timeout,
760         .ndo_change_mtu      = cdc_ncm_change_mtu,
761         .ndo_set_mac_address = eth_mac_addr,
762         .ndo_validate_addr   = eth_validate_addr,
763 };
764 
765 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
766 {
767         struct cdc_ncm_ctx *ctx;
768         struct usb_driver *driver;
769         u8 *buf;
770         int len;
771         int temp;
772         u8 iface_no;
773         struct usb_cdc_parsed_header hdr;
774 
775         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
776         if (!ctx)
777                 return -ENOMEM;
778 
779         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
780         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
781         ctx->bh.data = (unsigned long)dev;
782         ctx->bh.func = cdc_ncm_txpath_bh;
783         atomic_set(&ctx->stop, 0);
784         spin_lock_init(&ctx->mtx);
785 
786         /* store ctx pointer in device data field */
787         dev->data[0] = (unsigned long)ctx;
788 
789         /* only the control interface can be successfully probed */
790         ctx->control = intf;
791 
792         /* get some pointers */
793         driver = driver_of(intf);
794         buf = intf->cur_altsetting->extra;
795         len = intf->cur_altsetting->extralen;
796 
797         /* parse through descriptors associated with control interface */
798         cdc_parse_cdc_header(&hdr, intf, buf, len);
799 
800         if (hdr.usb_cdc_union_desc)
801                 ctx->data = usb_ifnum_to_if(dev->udev,
802                                             hdr.usb_cdc_union_desc->bSlaveInterface0);
803         ctx->ether_desc = hdr.usb_cdc_ether_desc;
804         ctx->func_desc = hdr.usb_cdc_ncm_desc;
805         ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
806         ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
807 
808         /* some buggy devices have an IAD but no CDC Union */
809         if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
810                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
811                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
812         }
813 
814         /* check if we got everything */
815         if (!ctx->data) {
816                 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
817                 goto error;
818         }
819         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
820                 if (!ctx->mbim_desc) {
821                         dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
822                         goto error;
823                 }
824         } else {
825                 if (!ctx->ether_desc || !ctx->func_desc) {
826                         dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
827                         goto error;
828                 }
829         }
830 
831         /* claim data interface, if different from control */
832         if (ctx->data != ctx->control) {
833                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
834                 if (temp) {
835                         dev_dbg(&intf->dev, "failed to claim data intf\n");
836                         goto error;
837                 }
838         }
839 
840         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
841 
842         /* Reset data interface. Some devices will not reset properly
843          * unless they are configured first.  Toggle the altsetting to
844          * force a reset
845          */
846         usb_set_interface(dev->udev, iface_no, data_altsetting);
847         temp = usb_set_interface(dev->udev, iface_no, 0);
848         if (temp) {
849                 dev_dbg(&intf->dev, "set interface failed\n");
850                 goto error2;
851         }
852 
853         /* initialize basic device settings */
854         if (cdc_ncm_init(dev))
855                 goto error2;
856 
857         /* Some firmwares need a pause here or they will silently fail
858          * to set up the interface properly.  This value was decided
859          * empirically on a Sierra Wireless MC7455 running 02.08.02.00
860          * firmware.
861          */
862         usleep_range(10000, 20000);
863 
864         /* configure data interface */
865         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
866         if (temp) {
867                 dev_dbg(&intf->dev, "set interface failed\n");
868                 goto error2;
869         }
870 
871         cdc_ncm_find_endpoints(dev, ctx->data);
872         cdc_ncm_find_endpoints(dev, ctx->control);
873         if (!dev->in || !dev->out || !dev->status) {
874                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
875                 goto error2;
876         }
877 
878         usb_set_intfdata(ctx->data, dev);
879         usb_set_intfdata(ctx->control, dev);
880 
881         if (ctx->ether_desc) {
882                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
883                 if (temp) {
884                         dev_dbg(&intf->dev, "failed to get mac address\n");
885                         goto error2;
886                 }
887                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
888         }
889 
890         /* finish setting up the device specific data */
891         cdc_ncm_setup(dev);
892 
893         /* Device-specific flags */
894         ctx->drvflags = drvflags;
895 
896         /* Allocate the delayed NDP if needed. */
897         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
898                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
899                 if (!ctx->delayed_ndp16)
900                         goto error2;
901                 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
902         }
903 
904         /* override ethtool_ops */
905         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
906 
907         /* add our sysfs attrs */
908         dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
909 
910         /* must handle MTU changes */
911         dev->net->netdev_ops = &cdc_ncm_netdev_ops;
912 
913         return 0;
914 
915 error2:
916         usb_set_intfdata(ctx->control, NULL);
917         usb_set_intfdata(ctx->data, NULL);
918         if (ctx->data != ctx->control)
919                 usb_driver_release_interface(driver, ctx->data);
920 error:
921         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
922         dev->data[0] = 0;
923         dev_info(&intf->dev, "bind() failure\n");
924         return -ENODEV;
925 }
926 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
927 
928 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
929 {
930         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
931         struct usb_driver *driver = driver_of(intf);
932 
933         if (ctx == NULL)
934                 return;         /* no setup */
935 
936         atomic_set(&ctx->stop, 1);
937 
938         if (hrtimer_active(&ctx->tx_timer))
939                 hrtimer_cancel(&ctx->tx_timer);
940 
941         tasklet_kill(&ctx->bh);
942 
943         /* handle devices with combined control and data interface */
944         if (ctx->control == ctx->data)
945                 ctx->data = NULL;
946 
947         /* disconnect master --> disconnect slave */
948         if (intf == ctx->control && ctx->data) {
949                 usb_set_intfdata(ctx->data, NULL);
950                 usb_driver_release_interface(driver, ctx->data);
951                 ctx->data = NULL;
952 
953         } else if (intf == ctx->data && ctx->control) {
954                 usb_set_intfdata(ctx->control, NULL);
955                 usb_driver_release_interface(driver, ctx->control);
956                 ctx->control = NULL;
957         }
958 
959         usb_set_intfdata(intf, NULL);
960         cdc_ncm_free(ctx);
961 }
962 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
963 
964 /* Return the number of the MBIM control interface altsetting iff it
965  * is preferred and available,
966  */
967 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
968 {
969         struct usb_host_interface *alt;
970 
971         /* The MBIM spec defines a NCM compatible default altsetting,
972          * which we may have matched:
973          *
974          *  "Functions that implement both NCM 1.0 and MBIM (an
975          *   “NCM/MBIM function”) according to this recommendation
976          *   shall provide two alternate settings for the
977          *   Communication Interface.  Alternate setting 0, and the
978          *   associated class and endpoint descriptors, shall be
979          *   constructed according to the rules given for the
980          *   Communication Interface in section 5 of [USBNCM10].
981          *   Alternate setting 1, and the associated class and
982          *   endpoint descriptors, shall be constructed according to
983          *   the rules given in section 6 (USB Device Model) of this
984          *   specification."
985          */
986         if (intf->num_altsetting < 2)
987                 return intf->cur_altsetting->desc.bAlternateSetting;
988 
989         if (prefer_mbim) {
990                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
991                 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
992                         return CDC_NCM_COMM_ALTSETTING_MBIM;
993         }
994         return CDC_NCM_COMM_ALTSETTING_NCM;
995 }
996 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
997 
998 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
999 {
1000         /* MBIM backwards compatible function? */
1001         if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1002                 return -ENODEV;
1003 
1004         /* The NCM data altsetting is fixed, so we hard-coded it.
1005          * Additionally, generic NCM devices are assumed to accept arbitrarily
1006          * placed NDP.
1007          */
1008         return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1009 }
1010 
1011 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1012 {
1013         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1014 
1015         if (skb->len + align > max)
1016                 align = max - skb->len;
1017         if (align && skb_tailroom(skb) >= align)
1018                 memset(skb_put(skb, align), 0, align);
1019 }
1020 
1021 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1022  * allocating a new one within skb
1023  */
1024 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1025 {
1026         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1027         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1028         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1029 
1030         /* If NDP should be moved to the end of the NCM package, we can't follow the
1031         * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1032         * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1033         */
1034         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1035                 if (ctx->delayed_ndp16->dwSignature == sign)
1036                         return ctx->delayed_ndp16;
1037 
1038                 /* We can only push a single NDP to the end. Return
1039                  * NULL to send what we've already got and queue this
1040                  * skb for later.
1041                  */
1042                 else if (ctx->delayed_ndp16->dwSignature)
1043                         return NULL;
1044         }
1045 
1046         /* follow the chain of NDPs, looking for a match */
1047         while (ndpoffset) {
1048                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1049                 if  (ndp16->dwSignature == sign)
1050                         return ndp16;
1051                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1052         }
1053 
1054         /* align new NDP */
1055         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1056                 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1057 
1058         /* verify that there is room for the NDP and the datagram (reserve) */
1059         if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1060                 return NULL;
1061 
1062         /* link to it */
1063         if (ndp16)
1064                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1065         else
1066                 nth16->wNdpIndex = cpu_to_le16(skb->len);
1067 
1068         /* push a new empty NDP */
1069         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1070                 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1071         else
1072                 ndp16 = ctx->delayed_ndp16;
1073 
1074         ndp16->dwSignature = sign;
1075         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1076         return ndp16;
1077 }
1078 
1079 struct sk_buff *
1080 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1081 {
1082         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1083         struct usb_cdc_ncm_nth16 *nth16;
1084         struct usb_cdc_ncm_ndp16 *ndp16;
1085         struct sk_buff *skb_out;
1086         u16 n = 0, index, ndplen;
1087         u8 ready2send = 0;
1088         u32 delayed_ndp_size;
1089 
1090         /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1091          * accordingly. Otherwise, we should check here.
1092          */
1093         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1094                 delayed_ndp_size = ctx->max_ndp_size;
1095         else
1096                 delayed_ndp_size = 0;
1097 
1098         /* if there is a remaining skb, it gets priority */
1099         if (skb != NULL) {
1100                 swap(skb, ctx->tx_rem_skb);
1101                 swap(sign, ctx->tx_rem_sign);
1102         } else {
1103                 ready2send = 1;
1104         }
1105 
1106         /* check if we are resuming an OUT skb */
1107         skb_out = ctx->tx_curr_skb;
1108 
1109         /* allocate a new OUT skb */
1110         if (!skb_out) {
1111                 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1112                 if (skb_out == NULL) {
1113                         if (skb != NULL) {
1114                                 dev_kfree_skb_any(skb);
1115                                 dev->net->stats.tx_dropped++;
1116                         }
1117                         goto exit_no_skb;
1118                 }
1119                 /* fill out the initial 16-bit NTB header */
1120                 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1121                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1122                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1123                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1124 
1125                 /* count total number of frames in this NTB */
1126                 ctx->tx_curr_frame_num = 0;
1127 
1128                 /* recent payload counter for this skb_out */
1129                 ctx->tx_curr_frame_payload = 0;
1130         }
1131 
1132         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1133                 /* send any remaining skb first */
1134                 if (skb == NULL) {
1135                         skb = ctx->tx_rem_skb;
1136                         sign = ctx->tx_rem_sign;
1137                         ctx->tx_rem_skb = NULL;
1138 
1139                         /* check for end of skb */
1140                         if (skb == NULL)
1141                                 break;
1142                 }
1143 
1144                 /* get the appropriate NDP for this skb */
1145                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1146 
1147                 /* align beginning of next frame */
1148                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1149 
1150                 /* check if we had enough room left for both NDP and frame */
1151                 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1152                         if (n == 0) {
1153                                 /* won't fit, MTU problem? */
1154                                 dev_kfree_skb_any(skb);
1155                                 skb = NULL;
1156                                 dev->net->stats.tx_dropped++;
1157                         } else {
1158                                 /* no room for skb - store for later */
1159                                 if (ctx->tx_rem_skb != NULL) {
1160                                         dev_kfree_skb_any(ctx->tx_rem_skb);
1161                                         dev->net->stats.tx_dropped++;
1162                                 }
1163                                 ctx->tx_rem_skb = skb;
1164                                 ctx->tx_rem_sign = sign;
1165                                 skb = NULL;
1166                                 ready2send = 1;
1167                                 ctx->tx_reason_ntb_full++;      /* count reason for transmitting */
1168                         }
1169                         break;
1170                 }
1171 
1172                 /* calculate frame number withing this NDP */
1173                 ndplen = le16_to_cpu(ndp16->wLength);
1174                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1175 
1176                 /* OK, add this skb */
1177                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1178                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1179                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1180                 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1181                 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1182                 dev_kfree_skb_any(skb);
1183                 skb = NULL;
1184 
1185                 /* send now if this NDP is full */
1186                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1187                         ready2send = 1;
1188                         ctx->tx_reason_ndp_full++;      /* count reason for transmitting */
1189                         break;
1190                 }
1191         }
1192 
1193         /* free up any dangling skb */
1194         if (skb != NULL) {
1195                 dev_kfree_skb_any(skb);
1196                 skb = NULL;
1197                 dev->net->stats.tx_dropped++;
1198         }
1199 
1200         ctx->tx_curr_frame_num = n;
1201 
1202         if (n == 0) {
1203                 /* wait for more frames */
1204                 /* push variables */
1205                 ctx->tx_curr_skb = skb_out;
1206                 goto exit_no_skb;
1207 
1208         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1209                 /* wait for more frames */
1210                 /* push variables */
1211                 ctx->tx_curr_skb = skb_out;
1212                 /* set the pending count */
1213                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1214                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1215                 goto exit_no_skb;
1216 
1217         } else {
1218                 if (n == ctx->tx_max_datagrams)
1219                         ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1220                 /* frame goes out */
1221                 /* variables will be reset at next call */
1222         }
1223 
1224         /* If requested, put NDP at end of frame. */
1225         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1226                 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1227                 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1228                 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1229                 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1230 
1231                 /* Zero out delayed NDP - signature checking will naturally fail. */
1232                 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1233         }
1234 
1235         /* If collected data size is less or equal ctx->min_tx_pkt
1236          * bytes, we send buffers as it is. If we get more data, it
1237          * would be more efficient for USB HS mobile device with DMA
1238          * engine to receive a full size NTB, than canceling DMA
1239          * transfer and receiving a short packet.
1240          *
1241          * This optimization support is pointless if we end up sending
1242          * a ZLP after full sized NTBs.
1243          */
1244         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1245             skb_out->len > ctx->min_tx_pkt)
1246                 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1247                        ctx->tx_max - skb_out->len);
1248         else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1249                 *skb_put(skb_out, 1) = 0;       /* force short packet */
1250 
1251         /* set final frame length */
1252         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1253         nth16->wBlockLength = cpu_to_le16(skb_out->len);
1254 
1255         /* return skb */
1256         ctx->tx_curr_skb = NULL;
1257 
1258         /* keep private stats: framing overhead and number of NTBs */
1259         ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1260         ctx->tx_ntbs++;
1261 
1262         /* usbnet will count all the framing overhead by default.
1263          * Adjust the stats so that the tx_bytes counter show real
1264          * payload data instead.
1265          */
1266         usbnet_set_skb_tx_stats(skb_out, n,
1267                                 (long)ctx->tx_curr_frame_payload - skb_out->len);
1268 
1269         return skb_out;
1270 
1271 exit_no_skb:
1272         /* Start timer, if there is a remaining non-empty skb */
1273         if (ctx->tx_curr_skb != NULL && n > 0)
1274                 cdc_ncm_tx_timeout_start(ctx);
1275         return NULL;
1276 }
1277 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1278 
1279 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1280 {
1281         /* start timer, if not already started */
1282         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1283                 hrtimer_start(&ctx->tx_timer,
1284                                 ktime_set(0, ctx->timer_interval),
1285                                 HRTIMER_MODE_REL);
1286 }
1287 
1288 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1289 {
1290         struct cdc_ncm_ctx *ctx =
1291                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
1292 
1293         if (!atomic_read(&ctx->stop))
1294                 tasklet_schedule(&ctx->bh);
1295         return HRTIMER_NORESTART;
1296 }
1297 
1298 static void cdc_ncm_txpath_bh(unsigned long param)
1299 {
1300         struct usbnet *dev = (struct usbnet *)param;
1301         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1302 
1303         spin_lock_bh(&ctx->mtx);
1304         if (ctx->tx_timer_pending != 0) {
1305                 ctx->tx_timer_pending--;
1306                 cdc_ncm_tx_timeout_start(ctx);
1307                 spin_unlock_bh(&ctx->mtx);
1308         } else if (dev->net != NULL) {
1309                 ctx->tx_reason_timeout++;       /* count reason for transmitting */
1310                 spin_unlock_bh(&ctx->mtx);
1311                 netif_tx_lock_bh(dev->net);
1312                 usbnet_start_xmit(NULL, dev->net);
1313                 netif_tx_unlock_bh(dev->net);
1314         } else {
1315                 spin_unlock_bh(&ctx->mtx);
1316         }
1317 }
1318 
1319 struct sk_buff *
1320 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1321 {
1322         struct sk_buff *skb_out;
1323         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1324 
1325         /*
1326          * The Ethernet API we are using does not support transmitting
1327          * multiple Ethernet frames in a single call. This driver will
1328          * accumulate multiple Ethernet frames and send out a larger
1329          * USB frame when the USB buffer is full or when a single jiffies
1330          * timeout happens.
1331          */
1332         if (ctx == NULL)
1333                 goto error;
1334 
1335         spin_lock_bh(&ctx->mtx);
1336         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1337         spin_unlock_bh(&ctx->mtx);
1338         return skb_out;
1339 
1340 error:
1341         if (skb != NULL)
1342                 dev_kfree_skb_any(skb);
1343 
1344         return NULL;
1345 }
1346 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1347 
1348 /* verify NTB header and return offset of first NDP, or negative error */
1349 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1350 {
1351         struct usbnet *dev = netdev_priv(skb_in->dev);
1352         struct usb_cdc_ncm_nth16 *nth16;
1353         int len;
1354         int ret = -EINVAL;
1355 
1356         if (ctx == NULL)
1357                 goto error;
1358 
1359         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1360                                         sizeof(struct usb_cdc_ncm_ndp16))) {
1361                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1362                 goto error;
1363         }
1364 
1365         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1366 
1367         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1368                 netif_dbg(dev, rx_err, dev->net,
1369                           "invalid NTH16 signature <%#010x>\n",
1370                           le32_to_cpu(nth16->dwSignature));
1371                 goto error;
1372         }
1373 
1374         len = le16_to_cpu(nth16->wBlockLength);
1375         if (len > ctx->rx_max) {
1376                 netif_dbg(dev, rx_err, dev->net,
1377                           "unsupported NTB block length %u/%u\n", len,
1378                           ctx->rx_max);
1379                 goto error;
1380         }
1381 
1382         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1383             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1384             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1385                 netif_dbg(dev, rx_err, dev->net,
1386                           "sequence number glitch prev=%d curr=%d\n",
1387                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1388         }
1389         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1390 
1391         ret = le16_to_cpu(nth16->wNdpIndex);
1392 error:
1393         return ret;
1394 }
1395 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1396 
1397 /* verify NDP header and return number of datagrams, or negative error */
1398 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1399 {
1400         struct usbnet *dev = netdev_priv(skb_in->dev);
1401         struct usb_cdc_ncm_ndp16 *ndp16;
1402         int ret = -EINVAL;
1403 
1404         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1405                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1406                           ndpoffset);
1407                 goto error;
1408         }
1409         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1410 
1411         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1412                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1413                           le16_to_cpu(ndp16->wLength));
1414                 goto error;
1415         }
1416 
1417         ret = ((le16_to_cpu(ndp16->wLength) -
1418                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1419                                         sizeof(struct usb_cdc_ncm_dpe16));
1420         ret--; /* we process NDP entries except for the last one */
1421 
1422         if ((sizeof(struct usb_cdc_ncm_ndp16) +
1423              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1424                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1425                 ret = -EINVAL;
1426         }
1427 
1428 error:
1429         return ret;
1430 }
1431 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1432 
1433 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1434 {
1435         struct sk_buff *skb;
1436         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1437         int len;
1438         int nframes;
1439         int x;
1440         int offset;
1441         struct usb_cdc_ncm_ndp16 *ndp16;
1442         struct usb_cdc_ncm_dpe16 *dpe16;
1443         int ndpoffset;
1444         int loopcount = 50; /* arbitrary max preventing infinite loop */
1445         u32 payload = 0;
1446 
1447         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1448         if (ndpoffset < 0)
1449                 goto error;
1450 
1451 next_ndp:
1452         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1453         if (nframes < 0)
1454                 goto error;
1455 
1456         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1457 
1458         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1459                 netif_dbg(dev, rx_err, dev->net,
1460                           "invalid DPT16 signature <%#010x>\n",
1461                           le32_to_cpu(ndp16->dwSignature));
1462                 goto err_ndp;
1463         }
1464         dpe16 = ndp16->dpe16;
1465 
1466         for (x = 0; x < nframes; x++, dpe16++) {
1467                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1468                 len = le16_to_cpu(dpe16->wDatagramLength);
1469 
1470                 /*
1471                  * CDC NCM ch. 3.7
1472                  * All entries after first NULL entry are to be ignored
1473                  */
1474                 if ((offset == 0) || (len == 0)) {
1475                         if (!x)
1476                                 goto err_ndp; /* empty NTB */
1477                         break;
1478                 }
1479 
1480                 /* sanity checking */
1481                 if (((offset + len) > skb_in->len) ||
1482                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1483                         netif_dbg(dev, rx_err, dev->net,
1484                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1485                                   x, offset, len, skb_in);
1486                         if (!x)
1487                                 goto err_ndp;
1488                         break;
1489 
1490                 } else {
1491                         /* create a fresh copy to reduce truesize */
1492                         skb = netdev_alloc_skb_ip_align(dev->net,  len);
1493                         if (!skb)
1494                                 goto error;
1495                         memcpy(skb_put(skb, len), skb_in->data + offset, len);
1496                         usbnet_skb_return(dev, skb);
1497                         payload += len; /* count payload bytes in this NTB */
1498                 }
1499         }
1500 err_ndp:
1501         /* are there more NDPs to process? */
1502         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1503         if (ndpoffset && loopcount--)
1504                 goto next_ndp;
1505 
1506         /* update stats */
1507         ctx->rx_overhead += skb_in->len - payload;
1508         ctx->rx_ntbs++;
1509 
1510         return 1;
1511 error:
1512         return 0;
1513 }
1514 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1515 
1516 static void
1517 cdc_ncm_speed_change(struct usbnet *dev,
1518                      struct usb_cdc_speed_change *data)
1519 {
1520         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1521         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1522 
1523         /*
1524          * Currently the USB-NET API does not support reporting the actual
1525          * device speed. Do print it instead.
1526          */
1527         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1528                 netif_info(dev, link, dev->net,
1529                            "%u mbit/s downlink %u mbit/s uplink\n",
1530                            (unsigned int)(rx_speed / 1000000U),
1531                            (unsigned int)(tx_speed / 1000000U));
1532         } else {
1533                 netif_info(dev, link, dev->net,
1534                            "%u kbit/s downlink %u kbit/s uplink\n",
1535                            (unsigned int)(rx_speed / 1000U),
1536                            (unsigned int)(tx_speed / 1000U));
1537         }
1538 }
1539 
1540 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1541 {
1542         struct cdc_ncm_ctx *ctx;
1543         struct usb_cdc_notification *event;
1544 
1545         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1546 
1547         if (urb->actual_length < sizeof(*event))
1548                 return;
1549 
1550         /* test for split data in 8-byte chunks */
1551         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1552                 cdc_ncm_speed_change(dev,
1553                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1554                 return;
1555         }
1556 
1557         event = urb->transfer_buffer;
1558 
1559         switch (event->bNotificationType) {
1560         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1561                 /*
1562                  * According to the CDC NCM specification ch.7.1
1563                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1564                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1565                  */
1566                 netif_info(dev, link, dev->net,
1567                            "network connection: %sconnected\n",
1568                            !!event->wValue ? "" : "dis");
1569                 usbnet_link_change(dev, !!event->wValue, 0);
1570                 break;
1571 
1572         case USB_CDC_NOTIFY_SPEED_CHANGE:
1573                 if (urb->actual_length < (sizeof(*event) +
1574                                         sizeof(struct usb_cdc_speed_change)))
1575                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1576                 else
1577                         cdc_ncm_speed_change(dev,
1578                                              (struct usb_cdc_speed_change *)&event[1]);
1579                 break;
1580 
1581         default:
1582                 dev_dbg(&dev->udev->dev,
1583                         "NCM: unexpected notification 0x%02x!\n",
1584                         event->bNotificationType);
1585                 break;
1586         }
1587 }
1588 
1589 static const struct driver_info cdc_ncm_info = {
1590         .description = "CDC NCM",
1591         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1592                         | FLAG_LINK_INTR,
1593         .bind = cdc_ncm_bind,
1594         .unbind = cdc_ncm_unbind,
1595         .manage_power = usbnet_manage_power,
1596         .status = cdc_ncm_status,
1597         .rx_fixup = cdc_ncm_rx_fixup,
1598         .tx_fixup = cdc_ncm_tx_fixup,
1599 };
1600 
1601 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1602 static const struct driver_info wwan_info = {
1603         .description = "Mobile Broadband Network Device",
1604         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1605                         | FLAG_LINK_INTR | FLAG_WWAN,
1606         .bind = cdc_ncm_bind,
1607         .unbind = cdc_ncm_unbind,
1608         .manage_power = usbnet_manage_power,
1609         .status = cdc_ncm_status,
1610         .rx_fixup = cdc_ncm_rx_fixup,
1611         .tx_fixup = cdc_ncm_tx_fixup,
1612 };
1613 
1614 /* Same as wwan_info, but with FLAG_NOARP  */
1615 static const struct driver_info wwan_noarp_info = {
1616         .description = "Mobile Broadband Network Device (NO ARP)",
1617         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1618                         | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1619         .bind = cdc_ncm_bind,
1620         .unbind = cdc_ncm_unbind,
1621         .manage_power = usbnet_manage_power,
1622         .status = cdc_ncm_status,
1623         .rx_fixup = cdc_ncm_rx_fixup,
1624         .tx_fixup = cdc_ncm_tx_fixup,
1625 };
1626 
1627 static const struct usb_device_id cdc_devs[] = {
1628         /* Ericsson MBM devices like F5521gw */
1629         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1630                 | USB_DEVICE_ID_MATCH_VENDOR,
1631           .idVendor = 0x0bdb,
1632           .bInterfaceClass = USB_CLASS_COMM,
1633           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1634           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1635           .driver_info = (unsigned long) &wwan_info,
1636         },
1637 
1638         /* Telit LE910 V2 */
1639         { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1640                 USB_CLASS_COMM,
1641                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1642           .driver_info = (unsigned long)&wwan_noarp_info,
1643         },
1644 
1645         /* DW5812 LTE Verizon Mobile Broadband Card
1646          * Unlike DW5550 this device requires FLAG_NOARP
1647          */
1648         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1649                 USB_CLASS_COMM,
1650                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1651           .driver_info = (unsigned long)&wwan_noarp_info,
1652         },
1653 
1654         /* DW5813 LTE AT&T Mobile Broadband Card
1655          * Unlike DW5550 this device requires FLAG_NOARP
1656          */
1657         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1658                 USB_CLASS_COMM,
1659                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1660           .driver_info = (unsigned long)&wwan_noarp_info,
1661         },
1662 
1663         /* Dell branded MBM devices like DW5550 */
1664         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1665                 | USB_DEVICE_ID_MATCH_VENDOR,
1666           .idVendor = 0x413c,
1667           .bInterfaceClass = USB_CLASS_COMM,
1668           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1669           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1670           .driver_info = (unsigned long) &wwan_info,
1671         },
1672 
1673         /* Toshiba branded MBM devices */
1674         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1675                 | USB_DEVICE_ID_MATCH_VENDOR,
1676           .idVendor = 0x0930,
1677           .bInterfaceClass = USB_CLASS_COMM,
1678           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1679           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1680           .driver_info = (unsigned long) &wwan_info,
1681         },
1682 
1683         /* tag Huawei devices as wwan */
1684         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1685                                         USB_CLASS_COMM,
1686                                         USB_CDC_SUBCLASS_NCM,
1687                                         USB_CDC_PROTO_NONE),
1688           .driver_info = (unsigned long)&wwan_info,
1689         },
1690 
1691         /* Infineon(now Intel) HSPA Modem platform */
1692         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1693                 USB_CLASS_COMM,
1694                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1695           .driver_info = (unsigned long)&wwan_noarp_info,
1696         },
1697 
1698         /* Generic CDC-NCM devices */
1699         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1700                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1701                 .driver_info = (unsigned long)&cdc_ncm_info,
1702         },
1703         {
1704         },
1705 };
1706 MODULE_DEVICE_TABLE(usb, cdc_devs);
1707 
1708 static struct usb_driver cdc_ncm_driver = {
1709         .name = "cdc_ncm",
1710         .id_table = cdc_devs,
1711         .probe = usbnet_probe,
1712         .disconnect = usbnet_disconnect,
1713         .suspend = usbnet_suspend,
1714         .resume = usbnet_resume,
1715         .reset_resume = usbnet_resume,
1716         .supports_autosuspend = 1,
1717         .disable_hub_initiated_lpm = 1,
1718 };
1719 
1720 module_usb_driver(cdc_ncm_driver);
1721 
1722 MODULE_AUTHOR("Hans Petter Selasky");
1723 MODULE_DESCRIPTION("USB CDC NCM host driver");
1724 MODULE_LICENSE("Dual BSD/GPL");
1725 

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