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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         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
744         int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
745 
746         if (new_mtu <= 0 || new_mtu > maxmtu)
747                 return -EINVAL;
748         net->mtu = new_mtu;
749         return 0;
750 }
751 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
752 
753 static const struct net_device_ops cdc_ncm_netdev_ops = {
754         .ndo_open            = usbnet_open,
755         .ndo_stop            = usbnet_stop,
756         .ndo_start_xmit      = usbnet_start_xmit,
757         .ndo_tx_timeout      = usbnet_tx_timeout,
758         .ndo_change_mtu      = cdc_ncm_change_mtu,
759         .ndo_set_mac_address = eth_mac_addr,
760         .ndo_validate_addr   = eth_validate_addr,
761 };
762 
763 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
764 {
765         struct cdc_ncm_ctx *ctx;
766         struct usb_driver *driver;
767         u8 *buf;
768         int len;
769         int temp;
770         u8 iface_no;
771         struct usb_cdc_parsed_header hdr;
772 
773         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
774         if (!ctx)
775                 return -ENOMEM;
776 
777         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
778         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
779         ctx->bh.data = (unsigned long)dev;
780         ctx->bh.func = cdc_ncm_txpath_bh;
781         atomic_set(&ctx->stop, 0);
782         spin_lock_init(&ctx->mtx);
783 
784         /* store ctx pointer in device data field */
785         dev->data[0] = (unsigned long)ctx;
786 
787         /* only the control interface can be successfully probed */
788         ctx->control = intf;
789 
790         /* get some pointers */
791         driver = driver_of(intf);
792         buf = intf->cur_altsetting->extra;
793         len = intf->cur_altsetting->extralen;
794 
795         /* parse through descriptors associated with control interface */
796         cdc_parse_cdc_header(&hdr, intf, buf, len);
797 
798         if (hdr.usb_cdc_union_desc)
799                 ctx->data = usb_ifnum_to_if(dev->udev,
800                                             hdr.usb_cdc_union_desc->bSlaveInterface0);
801         ctx->ether_desc = hdr.usb_cdc_ether_desc;
802         ctx->func_desc = hdr.usb_cdc_ncm_desc;
803         ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
804         ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
805 
806         /* some buggy devices have an IAD but no CDC Union */
807         if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
808                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
809                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
810         }
811 
812         /* check if we got everything */
813         if (!ctx->data) {
814                 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
815                 goto error;
816         }
817         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
818                 if (!ctx->mbim_desc) {
819                         dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
820                         goto error;
821                 }
822         } else {
823                 if (!ctx->ether_desc || !ctx->func_desc) {
824                         dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
825                         goto error;
826                 }
827         }
828 
829         /* claim data interface, if different from control */
830         if (ctx->data != ctx->control) {
831                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
832                 if (temp) {
833                         dev_dbg(&intf->dev, "failed to claim data intf\n");
834                         goto error;
835                 }
836         }
837 
838         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
839 
840         /* Reset data interface. Some devices will not reset properly
841          * unless they are configured first.  Toggle the altsetting to
842          * force a reset
843          */
844         usb_set_interface(dev->udev, iface_no, data_altsetting);
845         temp = usb_set_interface(dev->udev, iface_no, 0);
846         if (temp) {
847                 dev_dbg(&intf->dev, "set interface failed\n");
848                 goto error2;
849         }
850 
851         /* initialize basic device settings */
852         if (cdc_ncm_init(dev))
853                 goto error2;
854 
855         /* configure data interface */
856         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
857         if (temp) {
858                 dev_dbg(&intf->dev, "set interface failed\n");
859                 goto error2;
860         }
861 
862         cdc_ncm_find_endpoints(dev, ctx->data);
863         cdc_ncm_find_endpoints(dev, ctx->control);
864         if (!dev->in || !dev->out || !dev->status) {
865                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
866                 goto error2;
867         }
868 
869         usb_set_intfdata(ctx->data, dev);
870         usb_set_intfdata(ctx->control, dev);
871 
872         if (ctx->ether_desc) {
873                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
874                 if (temp) {
875                         dev_dbg(&intf->dev, "failed to get mac address\n");
876                         goto error2;
877                 }
878                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
879         }
880 
881         /* finish setting up the device specific data */
882         cdc_ncm_setup(dev);
883 
884         /* Device-specific flags */
885         ctx->drvflags = drvflags;
886 
887         /* Allocate the delayed NDP if needed. */
888         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
889                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
890                 if (!ctx->delayed_ndp16)
891                         goto error2;
892                 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
893         }
894 
895         /* override ethtool_ops */
896         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
897 
898         /* add our sysfs attrs */
899         dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
900 
901         /* must handle MTU changes */
902         dev->net->netdev_ops = &cdc_ncm_netdev_ops;
903 
904         return 0;
905 
906 error2:
907         usb_set_intfdata(ctx->control, NULL);
908         usb_set_intfdata(ctx->data, NULL);
909         if (ctx->data != ctx->control)
910                 usb_driver_release_interface(driver, ctx->data);
911 error:
912         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
913         dev->data[0] = 0;
914         dev_info(&intf->dev, "bind() failure\n");
915         return -ENODEV;
916 }
917 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
918 
919 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
920 {
921         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
922         struct usb_driver *driver = driver_of(intf);
923 
924         if (ctx == NULL)
925                 return;         /* no setup */
926 
927         atomic_set(&ctx->stop, 1);
928 
929         if (hrtimer_active(&ctx->tx_timer))
930                 hrtimer_cancel(&ctx->tx_timer);
931 
932         tasklet_kill(&ctx->bh);
933 
934         /* handle devices with combined control and data interface */
935         if (ctx->control == ctx->data)
936                 ctx->data = NULL;
937 
938         /* disconnect master --> disconnect slave */
939         if (intf == ctx->control && ctx->data) {
940                 usb_set_intfdata(ctx->data, NULL);
941                 usb_driver_release_interface(driver, ctx->data);
942                 ctx->data = NULL;
943 
944         } else if (intf == ctx->data && ctx->control) {
945                 usb_set_intfdata(ctx->control, NULL);
946                 usb_driver_release_interface(driver, ctx->control);
947                 ctx->control = NULL;
948         }
949 
950         usb_set_intfdata(intf, NULL);
951         cdc_ncm_free(ctx);
952 }
953 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
954 
955 /* Return the number of the MBIM control interface altsetting iff it
956  * is preferred and available,
957  */
958 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
959 {
960         struct usb_host_interface *alt;
961 
962         /* The MBIM spec defines a NCM compatible default altsetting,
963          * which we may have matched:
964          *
965          *  "Functions that implement both NCM 1.0 and MBIM (an
966          *   “NCM/MBIM function”) according to this recommendation
967          *   shall provide two alternate settings for the
968          *   Communication Interface.  Alternate setting 0, and the
969          *   associated class and endpoint descriptors, shall be
970          *   constructed according to the rules given for the
971          *   Communication Interface in section 5 of [USBNCM10].
972          *   Alternate setting 1, and the associated class and
973          *   endpoint descriptors, shall be constructed according to
974          *   the rules given in section 6 (USB Device Model) of this
975          *   specification."
976          */
977         if (intf->num_altsetting < 2)
978                 return intf->cur_altsetting->desc.bAlternateSetting;
979 
980         if (prefer_mbim) {
981                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
982                 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
983                         return CDC_NCM_COMM_ALTSETTING_MBIM;
984         }
985         return CDC_NCM_COMM_ALTSETTING_NCM;
986 }
987 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
988 
989 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
990 {
991         /* MBIM backwards compatible function? */
992         if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
993                 return -ENODEV;
994 
995         /* The NCM data altsetting is fixed, so we hard-coded it.
996          * Additionally, generic NCM devices are assumed to accept arbitrarily
997          * placed NDP.
998          */
999         return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1000 }
1001 
1002 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1003 {
1004         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1005 
1006         if (skb->len + align > max)
1007                 align = max - skb->len;
1008         if (align && skb_tailroom(skb) >= align)
1009                 memset(skb_put(skb, align), 0, align);
1010 }
1011 
1012 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1013  * allocating a new one within skb
1014  */
1015 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1016 {
1017         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1018         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1019         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1020 
1021         /* If NDP should be moved to the end of the NCM package, we can't follow the
1022         * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1023         * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1024         */
1025         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1026                 if (ctx->delayed_ndp16->dwSignature == sign)
1027                         return ctx->delayed_ndp16;
1028 
1029                 /* We can only push a single NDP to the end. Return
1030                  * NULL to send what we've already got and queue this
1031                  * skb for later.
1032                  */
1033                 else if (ctx->delayed_ndp16->dwSignature)
1034                         return NULL;
1035         }
1036 
1037         /* follow the chain of NDPs, looking for a match */
1038         while (ndpoffset) {
1039                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1040                 if  (ndp16->dwSignature == sign)
1041                         return ndp16;
1042                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1043         }
1044 
1045         /* align new NDP */
1046         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1047                 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1048 
1049         /* verify that there is room for the NDP and the datagram (reserve) */
1050         if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1051                 return NULL;
1052 
1053         /* link to it */
1054         if (ndp16)
1055                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1056         else
1057                 nth16->wNdpIndex = cpu_to_le16(skb->len);
1058 
1059         /* push a new empty NDP */
1060         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1061                 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1062         else
1063                 ndp16 = ctx->delayed_ndp16;
1064 
1065         ndp16->dwSignature = sign;
1066         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1067         return ndp16;
1068 }
1069 
1070 struct sk_buff *
1071 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1072 {
1073         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1074         struct usb_cdc_ncm_nth16 *nth16;
1075         struct usb_cdc_ncm_ndp16 *ndp16;
1076         struct sk_buff *skb_out;
1077         u16 n = 0, index, ndplen;
1078         u8 ready2send = 0;
1079         u32 delayed_ndp_size;
1080 
1081         /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1082          * accordingly. Otherwise, we should check here.
1083          */
1084         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1085                 delayed_ndp_size = ctx->max_ndp_size;
1086         else
1087                 delayed_ndp_size = 0;
1088 
1089         /* if there is a remaining skb, it gets priority */
1090         if (skb != NULL) {
1091                 swap(skb, ctx->tx_rem_skb);
1092                 swap(sign, ctx->tx_rem_sign);
1093         } else {
1094                 ready2send = 1;
1095         }
1096 
1097         /* check if we are resuming an OUT skb */
1098         skb_out = ctx->tx_curr_skb;
1099 
1100         /* allocate a new OUT skb */
1101         if (!skb_out) {
1102                 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1103                 if (skb_out == NULL) {
1104                         if (skb != NULL) {
1105                                 dev_kfree_skb_any(skb);
1106                                 dev->net->stats.tx_dropped++;
1107                         }
1108                         goto exit_no_skb;
1109                 }
1110                 /* fill out the initial 16-bit NTB header */
1111                 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1112                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1113                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1114                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1115 
1116                 /* count total number of frames in this NTB */
1117                 ctx->tx_curr_frame_num = 0;
1118 
1119                 /* recent payload counter for this skb_out */
1120                 ctx->tx_curr_frame_payload = 0;
1121         }
1122 
1123         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1124                 /* send any remaining skb first */
1125                 if (skb == NULL) {
1126                         skb = ctx->tx_rem_skb;
1127                         sign = ctx->tx_rem_sign;
1128                         ctx->tx_rem_skb = NULL;
1129 
1130                         /* check for end of skb */
1131                         if (skb == NULL)
1132                                 break;
1133                 }
1134 
1135                 /* get the appropriate NDP for this skb */
1136                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1137 
1138                 /* align beginning of next frame */
1139                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1140 
1141                 /* check if we had enough room left for both NDP and frame */
1142                 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1143                         if (n == 0) {
1144                                 /* won't fit, MTU problem? */
1145                                 dev_kfree_skb_any(skb);
1146                                 skb = NULL;
1147                                 dev->net->stats.tx_dropped++;
1148                         } else {
1149                                 /* no room for skb - store for later */
1150                                 if (ctx->tx_rem_skb != NULL) {
1151                                         dev_kfree_skb_any(ctx->tx_rem_skb);
1152                                         dev->net->stats.tx_dropped++;
1153                                 }
1154                                 ctx->tx_rem_skb = skb;
1155                                 ctx->tx_rem_sign = sign;
1156                                 skb = NULL;
1157                                 ready2send = 1;
1158                                 ctx->tx_reason_ntb_full++;      /* count reason for transmitting */
1159                         }
1160                         break;
1161                 }
1162 
1163                 /* calculate frame number withing this NDP */
1164                 ndplen = le16_to_cpu(ndp16->wLength);
1165                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1166 
1167                 /* OK, add this skb */
1168                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1169                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1170                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1171                 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1172                 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1173                 dev_kfree_skb_any(skb);
1174                 skb = NULL;
1175 
1176                 /* send now if this NDP is full */
1177                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1178                         ready2send = 1;
1179                         ctx->tx_reason_ndp_full++;      /* count reason for transmitting */
1180                         break;
1181                 }
1182         }
1183 
1184         /* free up any dangling skb */
1185         if (skb != NULL) {
1186                 dev_kfree_skb_any(skb);
1187                 skb = NULL;
1188                 dev->net->stats.tx_dropped++;
1189         }
1190 
1191         ctx->tx_curr_frame_num = n;
1192 
1193         if (n == 0) {
1194                 /* wait for more frames */
1195                 /* push variables */
1196                 ctx->tx_curr_skb = skb_out;
1197                 goto exit_no_skb;
1198 
1199         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1200                 /* wait for more frames */
1201                 /* push variables */
1202                 ctx->tx_curr_skb = skb_out;
1203                 /* set the pending count */
1204                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1205                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1206                 goto exit_no_skb;
1207 
1208         } else {
1209                 if (n == ctx->tx_max_datagrams)
1210                         ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1211                 /* frame goes out */
1212                 /* variables will be reset at next call */
1213         }
1214 
1215         /* If requested, put NDP at end of frame. */
1216         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1217                 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1218                 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1219                 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1220                 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1221 
1222                 /* Zero out delayed NDP - signature checking will naturally fail. */
1223                 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1224         }
1225 
1226         /* If collected data size is less or equal ctx->min_tx_pkt
1227          * bytes, we send buffers as it is. If we get more data, it
1228          * would be more efficient for USB HS mobile device with DMA
1229          * engine to receive a full size NTB, than canceling DMA
1230          * transfer and receiving a short packet.
1231          *
1232          * This optimization support is pointless if we end up sending
1233          * a ZLP after full sized NTBs.
1234          */
1235         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1236             skb_out->len > ctx->min_tx_pkt)
1237                 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1238                        ctx->tx_max - skb_out->len);
1239         else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1240                 *skb_put(skb_out, 1) = 0;       /* force short packet */
1241 
1242         /* set final frame length */
1243         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1244         nth16->wBlockLength = cpu_to_le16(skb_out->len);
1245 
1246         /* return skb */
1247         ctx->tx_curr_skb = NULL;
1248 
1249         /* keep private stats: framing overhead and number of NTBs */
1250         ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1251         ctx->tx_ntbs++;
1252 
1253         /* usbnet will count all the framing overhead by default.
1254          * Adjust the stats so that the tx_bytes counter show real
1255          * payload data instead.
1256          */
1257         usbnet_set_skb_tx_stats(skb_out, n,
1258                                 (long)ctx->tx_curr_frame_payload - skb_out->len);
1259 
1260         return skb_out;
1261 
1262 exit_no_skb:
1263         /* Start timer, if there is a remaining non-empty skb */
1264         if (ctx->tx_curr_skb != NULL && n > 0)
1265                 cdc_ncm_tx_timeout_start(ctx);
1266         return NULL;
1267 }
1268 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1269 
1270 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1271 {
1272         /* start timer, if not already started */
1273         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1274                 hrtimer_start(&ctx->tx_timer,
1275                                 ktime_set(0, ctx->timer_interval),
1276                                 HRTIMER_MODE_REL);
1277 }
1278 
1279 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1280 {
1281         struct cdc_ncm_ctx *ctx =
1282                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
1283 
1284         if (!atomic_read(&ctx->stop))
1285                 tasklet_schedule(&ctx->bh);
1286         return HRTIMER_NORESTART;
1287 }
1288 
1289 static void cdc_ncm_txpath_bh(unsigned long param)
1290 {
1291         struct usbnet *dev = (struct usbnet *)param;
1292         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1293 
1294         spin_lock_bh(&ctx->mtx);
1295         if (ctx->tx_timer_pending != 0) {
1296                 ctx->tx_timer_pending--;
1297                 cdc_ncm_tx_timeout_start(ctx);
1298                 spin_unlock_bh(&ctx->mtx);
1299         } else if (dev->net != NULL) {
1300                 ctx->tx_reason_timeout++;       /* count reason for transmitting */
1301                 spin_unlock_bh(&ctx->mtx);
1302                 netif_tx_lock_bh(dev->net);
1303                 usbnet_start_xmit(NULL, dev->net);
1304                 netif_tx_unlock_bh(dev->net);
1305         } else {
1306                 spin_unlock_bh(&ctx->mtx);
1307         }
1308 }
1309 
1310 struct sk_buff *
1311 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1312 {
1313         struct sk_buff *skb_out;
1314         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1315 
1316         /*
1317          * The Ethernet API we are using does not support transmitting
1318          * multiple Ethernet frames in a single call. This driver will
1319          * accumulate multiple Ethernet frames and send out a larger
1320          * USB frame when the USB buffer is full or when a single jiffies
1321          * timeout happens.
1322          */
1323         if (ctx == NULL)
1324                 goto error;
1325 
1326         spin_lock_bh(&ctx->mtx);
1327         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1328         spin_unlock_bh(&ctx->mtx);
1329         return skb_out;
1330 
1331 error:
1332         if (skb != NULL)
1333                 dev_kfree_skb_any(skb);
1334 
1335         return NULL;
1336 }
1337 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1338 
1339 /* verify NTB header and return offset of first NDP, or negative error */
1340 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1341 {
1342         struct usbnet *dev = netdev_priv(skb_in->dev);
1343         struct usb_cdc_ncm_nth16 *nth16;
1344         int len;
1345         int ret = -EINVAL;
1346 
1347         if (ctx == NULL)
1348                 goto error;
1349 
1350         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1351                                         sizeof(struct usb_cdc_ncm_ndp16))) {
1352                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1353                 goto error;
1354         }
1355 
1356         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1357 
1358         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1359                 netif_dbg(dev, rx_err, dev->net,
1360                           "invalid NTH16 signature <%#010x>\n",
1361                           le32_to_cpu(nth16->dwSignature));
1362                 goto error;
1363         }
1364 
1365         len = le16_to_cpu(nth16->wBlockLength);
1366         if (len > ctx->rx_max) {
1367                 netif_dbg(dev, rx_err, dev->net,
1368                           "unsupported NTB block length %u/%u\n", len,
1369                           ctx->rx_max);
1370                 goto error;
1371         }
1372 
1373         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1374             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1375             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1376                 netif_dbg(dev, rx_err, dev->net,
1377                           "sequence number glitch prev=%d curr=%d\n",
1378                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1379         }
1380         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1381 
1382         ret = le16_to_cpu(nth16->wNdpIndex);
1383 error:
1384         return ret;
1385 }
1386 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1387 
1388 /* verify NDP header and return number of datagrams, or negative error */
1389 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1390 {
1391         struct usbnet *dev = netdev_priv(skb_in->dev);
1392         struct usb_cdc_ncm_ndp16 *ndp16;
1393         int ret = -EINVAL;
1394 
1395         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1396                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1397                           ndpoffset);
1398                 goto error;
1399         }
1400         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1401 
1402         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1403                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1404                           le16_to_cpu(ndp16->wLength));
1405                 goto error;
1406         }
1407 
1408         ret = ((le16_to_cpu(ndp16->wLength) -
1409                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1410                                         sizeof(struct usb_cdc_ncm_dpe16));
1411         ret--; /* we process NDP entries except for the last one */
1412 
1413         if ((sizeof(struct usb_cdc_ncm_ndp16) +
1414              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1415                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1416                 ret = -EINVAL;
1417         }
1418 
1419 error:
1420         return ret;
1421 }
1422 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1423 
1424 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1425 {
1426         struct sk_buff *skb;
1427         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1428         int len;
1429         int nframes;
1430         int x;
1431         int offset;
1432         struct usb_cdc_ncm_ndp16 *ndp16;
1433         struct usb_cdc_ncm_dpe16 *dpe16;
1434         int ndpoffset;
1435         int loopcount = 50; /* arbitrary max preventing infinite loop */
1436         u32 payload = 0;
1437 
1438         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1439         if (ndpoffset < 0)
1440                 goto error;
1441 
1442 next_ndp:
1443         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1444         if (nframes < 0)
1445                 goto error;
1446 
1447         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1448 
1449         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1450                 netif_dbg(dev, rx_err, dev->net,
1451                           "invalid DPT16 signature <%#010x>\n",
1452                           le32_to_cpu(ndp16->dwSignature));
1453                 goto err_ndp;
1454         }
1455         dpe16 = ndp16->dpe16;
1456 
1457         for (x = 0; x < nframes; x++, dpe16++) {
1458                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1459                 len = le16_to_cpu(dpe16->wDatagramLength);
1460 
1461                 /*
1462                  * CDC NCM ch. 3.7
1463                  * All entries after first NULL entry are to be ignored
1464                  */
1465                 if ((offset == 0) || (len == 0)) {
1466                         if (!x)
1467                                 goto err_ndp; /* empty NTB */
1468                         break;
1469                 }
1470 
1471                 /* sanity checking */
1472                 if (((offset + len) > skb_in->len) ||
1473                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1474                         netif_dbg(dev, rx_err, dev->net,
1475                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1476                                   x, offset, len, skb_in);
1477                         if (!x)
1478                                 goto err_ndp;
1479                         break;
1480 
1481                 } else {
1482                         /* create a fresh copy to reduce truesize */
1483                         skb = netdev_alloc_skb_ip_align(dev->net,  len);
1484                         if (!skb)
1485                                 goto error;
1486                         memcpy(skb_put(skb, len), skb_in->data + offset, len);
1487                         usbnet_skb_return(dev, skb);
1488                         payload += len; /* count payload bytes in this NTB */
1489                 }
1490         }
1491 err_ndp:
1492         /* are there more NDPs to process? */
1493         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1494         if (ndpoffset && loopcount--)
1495                 goto next_ndp;
1496 
1497         /* update stats */
1498         ctx->rx_overhead += skb_in->len - payload;
1499         ctx->rx_ntbs++;
1500 
1501         return 1;
1502 error:
1503         return 0;
1504 }
1505 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1506 
1507 static void
1508 cdc_ncm_speed_change(struct usbnet *dev,
1509                      struct usb_cdc_speed_change *data)
1510 {
1511         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1512         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1513 
1514         /*
1515          * Currently the USB-NET API does not support reporting the actual
1516          * device speed. Do print it instead.
1517          */
1518         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1519                 netif_info(dev, link, dev->net,
1520                            "%u mbit/s downlink %u mbit/s uplink\n",
1521                            (unsigned int)(rx_speed / 1000000U),
1522                            (unsigned int)(tx_speed / 1000000U));
1523         } else {
1524                 netif_info(dev, link, dev->net,
1525                            "%u kbit/s downlink %u kbit/s uplink\n",
1526                            (unsigned int)(rx_speed / 1000U),
1527                            (unsigned int)(tx_speed / 1000U));
1528         }
1529 }
1530 
1531 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1532 {
1533         struct cdc_ncm_ctx *ctx;
1534         struct usb_cdc_notification *event;
1535 
1536         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1537 
1538         if (urb->actual_length < sizeof(*event))
1539                 return;
1540 
1541         /* test for split data in 8-byte chunks */
1542         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1543                 cdc_ncm_speed_change(dev,
1544                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1545                 return;
1546         }
1547 
1548         event = urb->transfer_buffer;
1549 
1550         switch (event->bNotificationType) {
1551         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1552                 /*
1553                  * According to the CDC NCM specification ch.7.1
1554                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1555                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1556                  */
1557                 netif_info(dev, link, dev->net,
1558                            "network connection: %sconnected\n",
1559                            !!event->wValue ? "" : "dis");
1560                 usbnet_link_change(dev, !!event->wValue, 0);
1561                 break;
1562 
1563         case USB_CDC_NOTIFY_SPEED_CHANGE:
1564                 if (urb->actual_length < (sizeof(*event) +
1565                                         sizeof(struct usb_cdc_speed_change)))
1566                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1567                 else
1568                         cdc_ncm_speed_change(dev,
1569                                              (struct usb_cdc_speed_change *)&event[1]);
1570                 break;
1571 
1572         default:
1573                 dev_dbg(&dev->udev->dev,
1574                         "NCM: unexpected notification 0x%02x!\n",
1575                         event->bNotificationType);
1576                 break;
1577         }
1578 }
1579 
1580 static const struct driver_info cdc_ncm_info = {
1581         .description = "CDC NCM",
1582         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1583                         | FLAG_LINK_INTR,
1584         .bind = cdc_ncm_bind,
1585         .unbind = cdc_ncm_unbind,
1586         .manage_power = usbnet_manage_power,
1587         .status = cdc_ncm_status,
1588         .rx_fixup = cdc_ncm_rx_fixup,
1589         .tx_fixup = cdc_ncm_tx_fixup,
1590 };
1591 
1592 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1593 static const struct driver_info wwan_info = {
1594         .description = "Mobile Broadband Network Device",
1595         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1596                         | FLAG_LINK_INTR | FLAG_WWAN,
1597         .bind = cdc_ncm_bind,
1598         .unbind = cdc_ncm_unbind,
1599         .manage_power = usbnet_manage_power,
1600         .status = cdc_ncm_status,
1601         .rx_fixup = cdc_ncm_rx_fixup,
1602         .tx_fixup = cdc_ncm_tx_fixup,
1603 };
1604 
1605 /* Same as wwan_info, but with FLAG_NOARP  */
1606 static const struct driver_info wwan_noarp_info = {
1607         .description = "Mobile Broadband Network Device (NO ARP)",
1608         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1609                         | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1610         .bind = cdc_ncm_bind,
1611         .unbind = cdc_ncm_unbind,
1612         .manage_power = usbnet_manage_power,
1613         .status = cdc_ncm_status,
1614         .rx_fixup = cdc_ncm_rx_fixup,
1615         .tx_fixup = cdc_ncm_tx_fixup,
1616 };
1617 
1618 static const struct usb_device_id cdc_devs[] = {
1619         /* Ericsson MBM devices like F5521gw */
1620         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1621                 | USB_DEVICE_ID_MATCH_VENDOR,
1622           .idVendor = 0x0bdb,
1623           .bInterfaceClass = USB_CLASS_COMM,
1624           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1625           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1626           .driver_info = (unsigned long) &wwan_info,
1627         },
1628 
1629         /* DW5812 LTE Verizon Mobile Broadband Card
1630          * Unlike DW5550 this device requires FLAG_NOARP
1631          */
1632         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1633                 USB_CLASS_COMM,
1634                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1635           .driver_info = (unsigned long)&wwan_noarp_info,
1636         },
1637 
1638         /* DW5813 LTE AT&T Mobile Broadband Card
1639          * Unlike DW5550 this device requires FLAG_NOARP
1640          */
1641         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1642                 USB_CLASS_COMM,
1643                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1644           .driver_info = (unsigned long)&wwan_noarp_info,
1645         },
1646 
1647         /* Dell branded MBM devices like DW5550 */
1648         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1649                 | USB_DEVICE_ID_MATCH_VENDOR,
1650           .idVendor = 0x413c,
1651           .bInterfaceClass = USB_CLASS_COMM,
1652           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1653           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1654           .driver_info = (unsigned long) &wwan_info,
1655         },
1656 
1657         /* Toshiba branded MBM devices */
1658         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1659                 | USB_DEVICE_ID_MATCH_VENDOR,
1660           .idVendor = 0x0930,
1661           .bInterfaceClass = USB_CLASS_COMM,
1662           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1663           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1664           .driver_info = (unsigned long) &wwan_info,
1665         },
1666 
1667         /* tag Huawei devices as wwan */
1668         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1669                                         USB_CLASS_COMM,
1670                                         USB_CDC_SUBCLASS_NCM,
1671                                         USB_CDC_PROTO_NONE),
1672           .driver_info = (unsigned long)&wwan_info,
1673         },
1674 
1675         /* Infineon(now Intel) HSPA Modem platform */
1676         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1677                 USB_CLASS_COMM,
1678                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1679           .driver_info = (unsigned long)&wwan_noarp_info,
1680         },
1681 
1682         /* Generic CDC-NCM devices */
1683         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1684                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1685                 .driver_info = (unsigned long)&cdc_ncm_info,
1686         },
1687         {
1688         },
1689 };
1690 MODULE_DEVICE_TABLE(usb, cdc_devs);
1691 
1692 static struct usb_driver cdc_ncm_driver = {
1693         .name = "cdc_ncm",
1694         .id_table = cdc_devs,
1695         .probe = usbnet_probe,
1696         .disconnect = usbnet_disconnect,
1697         .suspend = usbnet_suspend,
1698         .resume = usbnet_resume,
1699         .reset_resume = usbnet_resume,
1700         .supports_autosuspend = 1,
1701         .disable_hub_initiated_lpm = 1,
1702 };
1703 
1704 module_usb_driver(cdc_ncm_driver);
1705 
1706 MODULE_AUTHOR("Hans Petter Selasky");
1707 MODULE_DESCRIPTION("USB CDC NCM host driver");
1708 MODULE_LICENSE("Dual BSD/GPL");
1709 

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