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Linux/drivers/net/usb/cdc_ncm.c

  1 /*
  2  * cdc_ncm.c
  3  *
  4  * Copyright (C) ST-Ericsson 2010-2012
  5  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
  6  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
  7  *
  8  * USB Host Driver for Network Control Model (NCM)
  9  * http://www.usb.org/developers/devclass_docs/NCM10.zip
 10  *
 11  * The NCM encoding, decoding and initialization logic
 12  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
 13  *
 14  * This software is available to you under a choice of one of two
 15  * licenses. You may choose this file to be licensed under the terms
 16  * of the GNU General Public License (GPL) Version 2 or the 2-clause
 17  * BSD license listed below:
 18  *
 19  * Redistribution and use in source and binary forms, with or without
 20  * modification, are permitted provided that the following conditions
 21  * are met:
 22  * 1. Redistributions of source code must retain the above copyright
 23  *    notice, this list of conditions and the following disclaimer.
 24  * 2. Redistributions in binary form must reproduce the above copyright
 25  *    notice, this list of conditions and the following disclaimer in the
 26  *    documentation and/or other materials provided with the distribution.
 27  *
 28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 38  * SUCH DAMAGE.
 39  */
 40 
 41 #include <linux/module.h>
 42 #include <linux/netdevice.h>
 43 #include <linux/ctype.h>
 44 #include <linux/ethtool.h>
 45 #include <linux/workqueue.h>
 46 #include <linux/mii.h>
 47 #include <linux/crc32.h>
 48 #include <linux/usb.h>
 49 #include <linux/hrtimer.h>
 50 #include <linux/atomic.h>
 51 #include <linux/usb/usbnet.h>
 52 #include <linux/usb/cdc.h>
 53 #include <linux/usb/cdc_ncm.h>
 54 
 55 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
 56 static bool prefer_mbim = true;
 57 #else
 58 static bool prefer_mbim;
 59 #endif
 60 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
 61 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
 62 
 63 static void cdc_ncm_txpath_bh(unsigned long param);
 64 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
 65 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
 66 static struct usb_driver cdc_ncm_driver;
 67 
 68 static int cdc_ncm_setup(struct usbnet *dev)
 69 {
 70         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 71         u32 val;
 72         u8 flags;
 73         u8 iface_no;
 74         int err;
 75         int eth_hlen;
 76         u16 mbim_mtu;
 77         u16 ntb_fmt_supported;
 78         __le16 max_datagram_size;
 79 
 80         iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 81 
 82         err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
 83                               USB_TYPE_CLASS | USB_DIR_IN
 84                               |USB_RECIP_INTERFACE,
 85                               0, iface_no, &ctx->ncm_parm,
 86                               sizeof(ctx->ncm_parm));
 87         if (err < 0) {
 88                 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
 89                 return err; /* GET_NTB_PARAMETERS is required */
 90         }
 91 
 92         /* read correct set of parameters according to device mode */
 93         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
 94         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
 95         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
 96         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
 97         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
 98         /* devices prior to NCM Errata shall set this field to zero */
 99         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
100         ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
101 
102         /* there are some minor differences in NCM and MBIM defaults */
103         if (cdc_ncm_comm_intf_is_mbim(ctx->control->cur_altsetting)) {
104                 if (!ctx->mbim_desc)
105                         return -EINVAL;
106                 eth_hlen = 0;
107                 flags = ctx->mbim_desc->bmNetworkCapabilities;
108                 ctx->max_datagram_size = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
109                 if (ctx->max_datagram_size < CDC_MBIM_MIN_DATAGRAM_SIZE)
110                         ctx->max_datagram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
111         } else {
112                 if (!ctx->func_desc)
113                         return -EINVAL;
114                 eth_hlen = ETH_HLEN;
115                 flags = ctx->func_desc->bmNetworkCapabilities;
116                 ctx->max_datagram_size = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
117                 if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
118                         ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
119         }
120 
121         /* common absolute max for NCM and MBIM */
122         if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
123                 ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE;
124 
125         dev_dbg(&dev->intf->dev,
126                 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
127                 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
128                 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
129 
130         /* max count of tx datagrams */
131         if ((ctx->tx_max_datagrams == 0) ||
132                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
133                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
134 
135         /* verify maximum size of received NTB in bytes */
136         if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
137                 dev_dbg(&dev->intf->dev, "Using min receive length=%d\n",
138                         USB_CDC_NCM_NTB_MIN_IN_SIZE);
139                 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
140         }
141 
142         if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
143                 dev_dbg(&dev->intf->dev, "Using default maximum receive length=%d\n",
144                         CDC_NCM_NTB_MAX_SIZE_RX);
145                 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
146         }
147 
148         /* inform device about NTB input size changes */
149         if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
150                 __le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
151 
152                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
153                                        USB_TYPE_CLASS | USB_DIR_OUT
154                                        | USB_RECIP_INTERFACE,
155                                        0, iface_no, &dwNtbInMaxSize, 4);
156                 if (err < 0)
157                         dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
158         }
159 
160         /* verify maximum size of transmitted NTB in bytes */
161         if (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX) {
162                 dev_dbg(&dev->intf->dev, "Using default maximum transmit length=%d\n",
163                         CDC_NCM_NTB_MAX_SIZE_TX);
164                 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
165         }
166 
167         /*
168          * verify that the structure alignment is:
169          * - power of two
170          * - not greater than the maximum transmit length
171          * - not less than four bytes
172          */
173         val = ctx->tx_ndp_modulus;
174 
175         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
176             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
177                 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
178                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
179         }
180 
181         /*
182          * verify that the payload alignment is:
183          * - power of two
184          * - not greater than the maximum transmit length
185          * - not less than four bytes
186          */
187         val = ctx->tx_modulus;
188 
189         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
190             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
191                 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
192                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
193         }
194 
195         /* verify the payload remainder */
196         if (ctx->tx_remainder >= ctx->tx_modulus) {
197                 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
198                 ctx->tx_remainder = 0;
199         }
200 
201         /* adjust TX-remainder according to NCM specification. */
202         ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
203                              (ctx->tx_modulus - 1));
204 
205         /* additional configuration */
206 
207         /* set CRC Mode */
208         if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
209                 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
210                                        USB_TYPE_CLASS | USB_DIR_OUT
211                                        | USB_RECIP_INTERFACE,
212                                        USB_CDC_NCM_CRC_NOT_APPENDED,
213                                        iface_no, NULL, 0);
214                 if (err < 0)
215                         dev_dbg(&dev->intf->dev, "Setting CRC mode off failed\n");
216         }
217 
218         /* set NTB format, if both formats are supported */
219         if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
220                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
221                                        USB_TYPE_CLASS | USB_DIR_OUT
222                                        | USB_RECIP_INTERFACE,
223                                        USB_CDC_NCM_NTB16_FORMAT,
224                                        iface_no, NULL, 0);
225                 if (err < 0)
226                         dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit failed\n");
227         }
228 
229         /* inform the device about the selected Max Datagram Size */
230         if (!(flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
231                 goto out;
232 
233         /* read current mtu value from device */
234         err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
235                               USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
236                               0, iface_no, &max_datagram_size, 2);
237         if (err < 0) {
238                 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
239                 goto out;
240         }
241 
242         if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
243                 goto out;
244 
245         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
246         err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
247                                USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
248                                0, iface_no, &max_datagram_size, 2);
249         if (err < 0)
250                 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
251 
252 out:
253         /* set MTU to max supported by the device if necessary */
254         if (dev->net->mtu > ctx->max_datagram_size - eth_hlen)
255                 dev->net->mtu = ctx->max_datagram_size - eth_hlen;
256 
257         /* do not exceed operater preferred MTU */
258         if (ctx->mbim_extended_desc) {
259                 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
260                 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
261                         dev->net->mtu = mbim_mtu;
262         }
263 
264         return 0;
265 }
266 
267 static void
268 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
269 {
270         struct usb_host_endpoint *e, *in = NULL, *out = NULL;
271         u8 ep;
272 
273         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
274 
275                 e = intf->cur_altsetting->endpoint + ep;
276                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
277                 case USB_ENDPOINT_XFER_INT:
278                         if (usb_endpoint_dir_in(&e->desc)) {
279                                 if (!dev->status)
280                                         dev->status = e;
281                         }
282                         break;
283 
284                 case USB_ENDPOINT_XFER_BULK:
285                         if (usb_endpoint_dir_in(&e->desc)) {
286                                 if (!in)
287                                         in = e;
288                         } else {
289                                 if (!out)
290                                         out = e;
291                         }
292                         break;
293 
294                 default:
295                         break;
296                 }
297         }
298         if (in && !dev->in)
299                 dev->in = usb_rcvbulkpipe(dev->udev,
300                                           in->desc.bEndpointAddress &
301                                           USB_ENDPOINT_NUMBER_MASK);
302         if (out && !dev->out)
303                 dev->out = usb_sndbulkpipe(dev->udev,
304                                            out->desc.bEndpointAddress &
305                                            USB_ENDPOINT_NUMBER_MASK);
306 }
307 
308 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
309 {
310         if (ctx == NULL)
311                 return;
312 
313         if (ctx->tx_rem_skb != NULL) {
314                 dev_kfree_skb_any(ctx->tx_rem_skb);
315                 ctx->tx_rem_skb = NULL;
316         }
317 
318         if (ctx->tx_curr_skb != NULL) {
319                 dev_kfree_skb_any(ctx->tx_curr_skb);
320                 ctx->tx_curr_skb = NULL;
321         }
322 
323         kfree(ctx);
324 }
325 
326 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
327 {
328         const struct usb_cdc_union_desc *union_desc = NULL;
329         struct cdc_ncm_ctx *ctx;
330         struct usb_driver *driver;
331         u8 *buf;
332         int len;
333         int temp;
334         u8 iface_no;
335 
336         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
337         if (!ctx)
338                 return -ENOMEM;
339 
340         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
341         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
342         ctx->bh.data = (unsigned long)dev;
343         ctx->bh.func = cdc_ncm_txpath_bh;
344         atomic_set(&ctx->stop, 0);
345         spin_lock_init(&ctx->mtx);
346 
347         /* store ctx pointer in device data field */
348         dev->data[0] = (unsigned long)ctx;
349 
350         /* only the control interface can be successfully probed */
351         ctx->control = intf;
352 
353         /* get some pointers */
354         driver = driver_of(intf);
355         buf = intf->cur_altsetting->extra;
356         len = intf->cur_altsetting->extralen;
357 
358         /* parse through descriptors associated with control interface */
359         while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
360 
361                 if (buf[1] != USB_DT_CS_INTERFACE)
362                         goto advance;
363 
364                 switch (buf[2]) {
365                 case USB_CDC_UNION_TYPE:
366                         if (buf[0] < sizeof(*union_desc))
367                                 break;
368 
369                         union_desc = (const struct usb_cdc_union_desc *)buf;
370                         /* the master must be the interface we are probing */
371                         if (intf->cur_altsetting->desc.bInterfaceNumber !=
372                             union_desc->bMasterInterface0) {
373                                 dev_dbg(&intf->dev, "bogus CDC Union\n");
374                                 goto error;
375                         }
376                         ctx->data = usb_ifnum_to_if(dev->udev,
377                                                     union_desc->bSlaveInterface0);
378                         break;
379 
380                 case USB_CDC_ETHERNET_TYPE:
381                         if (buf[0] < sizeof(*(ctx->ether_desc)))
382                                 break;
383 
384                         ctx->ether_desc =
385                                         (const struct usb_cdc_ether_desc *)buf;
386                         break;
387 
388                 case USB_CDC_NCM_TYPE:
389                         if (buf[0] < sizeof(*(ctx->func_desc)))
390                                 break;
391 
392                         ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
393                         break;
394 
395                 case USB_CDC_MBIM_TYPE:
396                         if (buf[0] < sizeof(*(ctx->mbim_desc)))
397                                 break;
398 
399                         ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
400                         break;
401 
402                 case USB_CDC_MBIM_EXTENDED_TYPE:
403                         if (buf[0] < sizeof(*(ctx->mbim_extended_desc)))
404                                 break;
405 
406                         ctx->mbim_extended_desc =
407                                 (const struct usb_cdc_mbim_extended_desc *)buf;
408                         break;
409 
410                 default:
411                         break;
412                 }
413 advance:
414                 /* advance to next descriptor */
415                 temp = buf[0];
416                 buf += temp;
417                 len -= temp;
418         }
419 
420         /* some buggy devices have an IAD but no CDC Union */
421         if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
422                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
423                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
424         }
425 
426         /* check if we got everything */
427         if (!ctx->data || (!ctx->mbim_desc && !ctx->ether_desc)) {
428                 dev_dbg(&intf->dev, "CDC descriptors missing\n");
429                 goto error;
430         }
431 
432         /* claim data interface, if different from control */
433         if (ctx->data != ctx->control) {
434                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
435                 if (temp) {
436                         dev_dbg(&intf->dev, "failed to claim data intf\n");
437                         goto error;
438                 }
439         }
440 
441         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
442 
443         /* reset data interface */
444         temp = usb_set_interface(dev->udev, iface_no, 0);
445         if (temp) {
446                 dev_dbg(&intf->dev, "set interface failed\n");
447                 goto error2;
448         }
449 
450         /* initialize data interface */
451         if (cdc_ncm_setup(dev))
452                 goto error2;
453 
454         /* configure data interface */
455         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
456         if (temp) {
457                 dev_dbg(&intf->dev, "set interface failed\n");
458                 goto error2;
459         }
460 
461         cdc_ncm_find_endpoints(dev, ctx->data);
462         cdc_ncm_find_endpoints(dev, ctx->control);
463         if (!dev->in || !dev->out || !dev->status) {
464                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
465                 goto error2;
466         }
467 
468         usb_set_intfdata(ctx->data, dev);
469         usb_set_intfdata(ctx->control, dev);
470 
471         if (ctx->ether_desc) {
472                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
473                 if (temp) {
474                         dev_dbg(&intf->dev, "failed to get mac address\n");
475                         goto error2;
476                 }
477                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
478         }
479 
480         /* usbnet use these values for sizing tx/rx queues */
481         dev->hard_mtu = ctx->tx_max;
482         dev->rx_urb_size = ctx->rx_max;
483 
484         /* cdc_ncm_setup will override dwNtbOutMaxSize if it is
485          * outside the sane range. Adding a pad byte here if necessary
486          * simplifies the handling in cdc_ncm_fill_tx_frame, making
487          * tx_max always represent the real skb max size.
488          */
489         if (ctx->tx_max != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
490             ctx->tx_max % usb_maxpacket(dev->udev, dev->out, 1) == 0)
491                 ctx->tx_max++;
492 
493         return 0;
494 
495 error2:
496         usb_set_intfdata(ctx->control, NULL);
497         usb_set_intfdata(ctx->data, NULL);
498         if (ctx->data != ctx->control)
499                 usb_driver_release_interface(driver, ctx->data);
500 error:
501         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
502         dev->data[0] = 0;
503         dev_info(&intf->dev, "bind() failure\n");
504         return -ENODEV;
505 }
506 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
507 
508 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
509 {
510         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
511         struct usb_driver *driver = driver_of(intf);
512 
513         if (ctx == NULL)
514                 return;         /* no setup */
515 
516         atomic_set(&ctx->stop, 1);
517 
518         if (hrtimer_active(&ctx->tx_timer))
519                 hrtimer_cancel(&ctx->tx_timer);
520 
521         tasklet_kill(&ctx->bh);
522 
523         /* handle devices with combined control and data interface */
524         if (ctx->control == ctx->data)
525                 ctx->data = NULL;
526 
527         /* disconnect master --> disconnect slave */
528         if (intf == ctx->control && ctx->data) {
529                 usb_set_intfdata(ctx->data, NULL);
530                 usb_driver_release_interface(driver, ctx->data);
531                 ctx->data = NULL;
532 
533         } else if (intf == ctx->data && ctx->control) {
534                 usb_set_intfdata(ctx->control, NULL);
535                 usb_driver_release_interface(driver, ctx->control);
536                 ctx->control = NULL;
537         }
538 
539         usb_set_intfdata(intf, NULL);
540         cdc_ncm_free(ctx);
541 }
542 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
543 
544 /* Select the MBIM altsetting iff it is preferred and available,
545  * returning the number of the corresponding data interface altsetting
546  */
547 u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf)
548 {
549         struct usb_host_interface *alt;
550 
551         /* The MBIM spec defines a NCM compatible default altsetting,
552          * which we may have matched:
553          *
554          *  "Functions that implement both NCM 1.0 and MBIM (an
555          *   “NCM/MBIM function”) according to this recommendation
556          *   shall provide two alternate settings for the
557          *   Communication Interface.  Alternate setting 0, and the
558          *   associated class and endpoint descriptors, shall be
559          *   constructed according to the rules given for the
560          *   Communication Interface in section 5 of [USBNCM10].
561          *   Alternate setting 1, and the associated class and
562          *   endpoint descriptors, shall be constructed according to
563          *   the rules given in section 6 (USB Device Model) of this
564          *   specification."
565          */
566         if (prefer_mbim && intf->num_altsetting == 2) {
567                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
568                 if (alt && cdc_ncm_comm_intf_is_mbim(alt) &&
569                     !usb_set_interface(dev->udev,
570                                        intf->cur_altsetting->desc.bInterfaceNumber,
571                                        CDC_NCM_COMM_ALTSETTING_MBIM))
572                         return CDC_NCM_DATA_ALTSETTING_MBIM;
573         }
574         return CDC_NCM_DATA_ALTSETTING_NCM;
575 }
576 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
577 
578 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
579 {
580         int ret;
581 
582         /* MBIM backwards compatible function? */
583         cdc_ncm_select_altsetting(dev, intf);
584         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
585                 return -ENODEV;
586 
587         /* NCM data altsetting is always 1 */
588         ret = cdc_ncm_bind_common(dev, intf, 1);
589 
590         /*
591          * We should get an event when network connection is "connected" or
592          * "disconnected". Set network connection in "disconnected" state
593          * (carrier is OFF) during attach, so the IP network stack does not
594          * start IPv6 negotiation and more.
595          */
596         usbnet_link_change(dev, 0, 0);
597         return ret;
598 }
599 
600 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
601 {
602         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
603 
604         if (skb->len + align > max)
605                 align = max - skb->len;
606         if (align && skb_tailroom(skb) >= align)
607                 memset(skb_put(skb, align), 0, align);
608 }
609 
610 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
611  * allocating a new one within skb
612  */
613 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
614 {
615         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
616         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
617         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
618 
619         /* follow the chain of NDPs, looking for a match */
620         while (ndpoffset) {
621                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
622                 if  (ndp16->dwSignature == sign)
623                         return ndp16;
624                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
625         }
626 
627         /* align new NDP */
628         cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
629 
630         /* verify that there is room for the NDP and the datagram (reserve) */
631         if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE)
632                 return NULL;
633 
634         /* link to it */
635         if (ndp16)
636                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
637         else
638                 nth16->wNdpIndex = cpu_to_le16(skb->len);
639 
640         /* push a new empty NDP */
641         ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE);
642         ndp16->dwSignature = sign;
643         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
644         return ndp16;
645 }
646 
647 struct sk_buff *
648 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
649 {
650         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
651         struct usb_cdc_ncm_nth16 *nth16;
652         struct usb_cdc_ncm_ndp16 *ndp16;
653         struct sk_buff *skb_out;
654         u16 n = 0, index, ndplen;
655         u8 ready2send = 0;
656 
657         /* if there is a remaining skb, it gets priority */
658         if (skb != NULL) {
659                 swap(skb, ctx->tx_rem_skb);
660                 swap(sign, ctx->tx_rem_sign);
661         } else {
662                 ready2send = 1;
663         }
664 
665         /* check if we are resuming an OUT skb */
666         skb_out = ctx->tx_curr_skb;
667 
668         /* allocate a new OUT skb */
669         if (!skb_out) {
670                 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
671                 if (skb_out == NULL) {
672                         if (skb != NULL) {
673                                 dev_kfree_skb_any(skb);
674                                 dev->net->stats.tx_dropped++;
675                         }
676                         goto exit_no_skb;
677                 }
678                 /* fill out the initial 16-bit NTB header */
679                 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
680                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
681                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
682                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
683 
684                 /* count total number of frames in this NTB */
685                 ctx->tx_curr_frame_num = 0;
686         }
687 
688         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
689                 /* send any remaining skb first */
690                 if (skb == NULL) {
691                         skb = ctx->tx_rem_skb;
692                         sign = ctx->tx_rem_sign;
693                         ctx->tx_rem_skb = NULL;
694 
695                         /* check for end of skb */
696                         if (skb == NULL)
697                                 break;
698                 }
699 
700                 /* get the appropriate NDP for this skb */
701                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
702 
703                 /* align beginning of next frame */
704                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
705 
706                 /* check if we had enough room left for both NDP and frame */
707                 if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
708                         if (n == 0) {
709                                 /* won't fit, MTU problem? */
710                                 dev_kfree_skb_any(skb);
711                                 skb = NULL;
712                                 dev->net->stats.tx_dropped++;
713                         } else {
714                                 /* no room for skb - store for later */
715                                 if (ctx->tx_rem_skb != NULL) {
716                                         dev_kfree_skb_any(ctx->tx_rem_skb);
717                                         dev->net->stats.tx_dropped++;
718                                 }
719                                 ctx->tx_rem_skb = skb;
720                                 ctx->tx_rem_sign = sign;
721                                 skb = NULL;
722                                 ready2send = 1;
723                         }
724                         break;
725                 }
726 
727                 /* calculate frame number withing this NDP */
728                 ndplen = le16_to_cpu(ndp16->wLength);
729                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
730 
731                 /* OK, add this skb */
732                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
733                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
734                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
735                 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
736                 dev_kfree_skb_any(skb);
737                 skb = NULL;
738 
739                 /* send now if this NDP is full */
740                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
741                         ready2send = 1;
742                         break;
743                 }
744         }
745 
746         /* free up any dangling skb */
747         if (skb != NULL) {
748                 dev_kfree_skb_any(skb);
749                 skb = NULL;
750                 dev->net->stats.tx_dropped++;
751         }
752 
753         ctx->tx_curr_frame_num = n;
754 
755         if (n == 0) {
756                 /* wait for more frames */
757                 /* push variables */
758                 ctx->tx_curr_skb = skb_out;
759                 goto exit_no_skb;
760 
761         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
762                 /* wait for more frames */
763                 /* push variables */
764                 ctx->tx_curr_skb = skb_out;
765                 /* set the pending count */
766                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
767                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
768                 goto exit_no_skb;
769 
770         } else {
771                 /* frame goes out */
772                 /* variables will be reset at next call */
773         }
774 
775         /* If collected data size is less or equal CDC_NCM_MIN_TX_PKT
776          * bytes, we send buffers as it is. If we get more data, it
777          * would be more efficient for USB HS mobile device with DMA
778          * engine to receive a full size NTB, than canceling DMA
779          * transfer and receiving a short packet.
780          *
781          * This optimization support is pointless if we end up sending
782          * a ZLP after full sized NTBs.
783          */
784         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
785             skb_out->len > CDC_NCM_MIN_TX_PKT)
786                 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
787                        ctx->tx_max - skb_out->len);
788         else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
789                 *skb_put(skb_out, 1) = 0;       /* force short packet */
790 
791         /* set final frame length */
792         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
793         nth16->wBlockLength = cpu_to_le16(skb_out->len);
794 
795         /* return skb */
796         ctx->tx_curr_skb = NULL;
797         dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
798         return skb_out;
799 
800 exit_no_skb:
801         /* Start timer, if there is a remaining skb */
802         if (ctx->tx_curr_skb != NULL)
803                 cdc_ncm_tx_timeout_start(ctx);
804         return NULL;
805 }
806 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
807 
808 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
809 {
810         /* start timer, if not already started */
811         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
812                 hrtimer_start(&ctx->tx_timer,
813                                 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
814                                 HRTIMER_MODE_REL);
815 }
816 
817 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
818 {
819         struct cdc_ncm_ctx *ctx =
820                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
821 
822         if (!atomic_read(&ctx->stop))
823                 tasklet_schedule(&ctx->bh);
824         return HRTIMER_NORESTART;
825 }
826 
827 static void cdc_ncm_txpath_bh(unsigned long param)
828 {
829         struct usbnet *dev = (struct usbnet *)param;
830         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
831 
832         spin_lock_bh(&ctx->mtx);
833         if (ctx->tx_timer_pending != 0) {
834                 ctx->tx_timer_pending--;
835                 cdc_ncm_tx_timeout_start(ctx);
836                 spin_unlock_bh(&ctx->mtx);
837         } else if (dev->net != NULL) {
838                 spin_unlock_bh(&ctx->mtx);
839                 netif_tx_lock_bh(dev->net);
840                 usbnet_start_xmit(NULL, dev->net);
841                 netif_tx_unlock_bh(dev->net);
842         } else {
843                 spin_unlock_bh(&ctx->mtx);
844         }
845 }
846 
847 struct sk_buff *
848 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
849 {
850         struct sk_buff *skb_out;
851         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
852 
853         /*
854          * The Ethernet API we are using does not support transmitting
855          * multiple Ethernet frames in a single call. This driver will
856          * accumulate multiple Ethernet frames and send out a larger
857          * USB frame when the USB buffer is full or when a single jiffies
858          * timeout happens.
859          */
860         if (ctx == NULL)
861                 goto error;
862 
863         spin_lock_bh(&ctx->mtx);
864         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
865         spin_unlock_bh(&ctx->mtx);
866         return skb_out;
867 
868 error:
869         if (skb != NULL)
870                 dev_kfree_skb_any(skb);
871 
872         return NULL;
873 }
874 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
875 
876 /* verify NTB header and return offset of first NDP, or negative error */
877 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
878 {
879         struct usbnet *dev = netdev_priv(skb_in->dev);
880         struct usb_cdc_ncm_nth16 *nth16;
881         int len;
882         int ret = -EINVAL;
883 
884         if (ctx == NULL)
885                 goto error;
886 
887         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
888                                         sizeof(struct usb_cdc_ncm_ndp16))) {
889                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
890                 goto error;
891         }
892 
893         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
894 
895         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
896                 netif_dbg(dev, rx_err, dev->net,
897                           "invalid NTH16 signature <%#010x>\n",
898                           le32_to_cpu(nth16->dwSignature));
899                 goto error;
900         }
901 
902         len = le16_to_cpu(nth16->wBlockLength);
903         if (len > ctx->rx_max) {
904                 netif_dbg(dev, rx_err, dev->net,
905                           "unsupported NTB block length %u/%u\n", len,
906                           ctx->rx_max);
907                 goto error;
908         }
909 
910         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
911             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
912             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
913                 netif_dbg(dev, rx_err, dev->net,
914                           "sequence number glitch prev=%d curr=%d\n",
915                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
916         }
917         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
918 
919         ret = le16_to_cpu(nth16->wNdpIndex);
920 error:
921         return ret;
922 }
923 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
924 
925 /* verify NDP header and return number of datagrams, or negative error */
926 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
927 {
928         struct usbnet *dev = netdev_priv(skb_in->dev);
929         struct usb_cdc_ncm_ndp16 *ndp16;
930         int ret = -EINVAL;
931 
932         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
933                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
934                           ndpoffset);
935                 goto error;
936         }
937         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
938 
939         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
940                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
941                           le16_to_cpu(ndp16->wLength));
942                 goto error;
943         }
944 
945         ret = ((le16_to_cpu(ndp16->wLength) -
946                                         sizeof(struct usb_cdc_ncm_ndp16)) /
947                                         sizeof(struct usb_cdc_ncm_dpe16));
948         ret--; /* we process NDP entries except for the last one */
949 
950         if ((sizeof(struct usb_cdc_ncm_ndp16) +
951              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
952                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
953                 ret = -EINVAL;
954         }
955 
956 error:
957         return ret;
958 }
959 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
960 
961 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
962 {
963         struct sk_buff *skb;
964         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
965         int len;
966         int nframes;
967         int x;
968         int offset;
969         struct usb_cdc_ncm_ndp16 *ndp16;
970         struct usb_cdc_ncm_dpe16 *dpe16;
971         int ndpoffset;
972         int loopcount = 50; /* arbitrary max preventing infinite loop */
973 
974         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
975         if (ndpoffset < 0)
976                 goto error;
977 
978 next_ndp:
979         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
980         if (nframes < 0)
981                 goto error;
982 
983         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
984 
985         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
986                 netif_dbg(dev, rx_err, dev->net,
987                           "invalid DPT16 signature <%#010x>\n",
988                           le32_to_cpu(ndp16->dwSignature));
989                 goto err_ndp;
990         }
991         dpe16 = ndp16->dpe16;
992 
993         for (x = 0; x < nframes; x++, dpe16++) {
994                 offset = le16_to_cpu(dpe16->wDatagramIndex);
995                 len = le16_to_cpu(dpe16->wDatagramLength);
996 
997                 /*
998                  * CDC NCM ch. 3.7
999                  * All entries after first NULL entry are to be ignored
1000                  */
1001                 if ((offset == 0) || (len == 0)) {
1002                         if (!x)
1003                                 goto err_ndp; /* empty NTB */
1004                         break;
1005                 }
1006 
1007                 /* sanity checking */
1008                 if (((offset + len) > skb_in->len) ||
1009                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1010                         netif_dbg(dev, rx_err, dev->net,
1011                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1012                                   x, offset, len, skb_in);
1013                         if (!x)
1014                                 goto err_ndp;
1015                         break;
1016 
1017                 } else {
1018                         skb = skb_clone(skb_in, GFP_ATOMIC);
1019                         if (!skb)
1020                                 goto error;
1021                         skb->len = len;
1022                         skb->data = ((u8 *)skb_in->data) + offset;
1023                         skb_set_tail_pointer(skb, len);
1024                         usbnet_skb_return(dev, skb);
1025                 }
1026         }
1027 err_ndp:
1028         /* are there more NDPs to process? */
1029         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1030         if (ndpoffset && loopcount--)
1031                 goto next_ndp;
1032 
1033         return 1;
1034 error:
1035         return 0;
1036 }
1037 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1038 
1039 static void
1040 cdc_ncm_speed_change(struct usbnet *dev,
1041                      struct usb_cdc_speed_change *data)
1042 {
1043         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1044         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1045 
1046         /*
1047          * Currently the USB-NET API does not support reporting the actual
1048          * device speed. Do print it instead.
1049          */
1050         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1051                 netif_info(dev, link, dev->net,
1052                        "%u mbit/s downlink %u mbit/s uplink\n",
1053                        (unsigned int)(rx_speed / 1000000U),
1054                        (unsigned int)(tx_speed / 1000000U));
1055         } else {
1056                 netif_info(dev, link, dev->net,
1057                        "%u kbit/s downlink %u kbit/s uplink\n",
1058                        (unsigned int)(rx_speed / 1000U),
1059                        (unsigned int)(tx_speed / 1000U));
1060         }
1061 }
1062 
1063 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1064 {
1065         struct cdc_ncm_ctx *ctx;
1066         struct usb_cdc_notification *event;
1067 
1068         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1069 
1070         if (urb->actual_length < sizeof(*event))
1071                 return;
1072 
1073         /* test for split data in 8-byte chunks */
1074         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1075                 cdc_ncm_speed_change(dev,
1076                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1077                 return;
1078         }
1079 
1080         event = urb->transfer_buffer;
1081 
1082         switch (event->bNotificationType) {
1083         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1084                 /*
1085                  * According to the CDC NCM specification ch.7.1
1086                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1087                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1088                  */
1089                 ctx->connected = le16_to_cpu(event->wValue);
1090                 netif_info(dev, link, dev->net,
1091                            "network connection: %sconnected\n",
1092                            ctx->connected ? "" : "dis");
1093                 usbnet_link_change(dev, ctx->connected, 0);
1094                 break;
1095 
1096         case USB_CDC_NOTIFY_SPEED_CHANGE:
1097                 if (urb->actual_length < (sizeof(*event) +
1098                                         sizeof(struct usb_cdc_speed_change)))
1099                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1100                 else
1101                         cdc_ncm_speed_change(dev,
1102                                              (struct usb_cdc_speed_change *)&event[1]);
1103                 break;
1104 
1105         default:
1106                 dev_dbg(&dev->udev->dev,
1107                         "NCM: unexpected notification 0x%02x!\n",
1108                         event->bNotificationType);
1109                 break;
1110         }
1111 }
1112 
1113 static int cdc_ncm_check_connect(struct usbnet *dev)
1114 {
1115         struct cdc_ncm_ctx *ctx;
1116 
1117         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1118         if (ctx == NULL)
1119                 return 1;       /* disconnected */
1120 
1121         return !ctx->connected;
1122 }
1123 
1124 static const struct driver_info cdc_ncm_info = {
1125         .description = "CDC NCM",
1126         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1127         .bind = cdc_ncm_bind,
1128         .unbind = cdc_ncm_unbind,
1129         .check_connect = cdc_ncm_check_connect,
1130         .manage_power = usbnet_manage_power,
1131         .status = cdc_ncm_status,
1132         .rx_fixup = cdc_ncm_rx_fixup,
1133         .tx_fixup = cdc_ncm_tx_fixup,
1134 };
1135 
1136 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1137 static const struct driver_info wwan_info = {
1138         .description = "Mobile Broadband Network Device",
1139         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1140                         | FLAG_WWAN,
1141         .bind = cdc_ncm_bind,
1142         .unbind = cdc_ncm_unbind,
1143         .check_connect = cdc_ncm_check_connect,
1144         .manage_power = usbnet_manage_power,
1145         .status = cdc_ncm_status,
1146         .rx_fixup = cdc_ncm_rx_fixup,
1147         .tx_fixup = cdc_ncm_tx_fixup,
1148 };
1149 
1150 /* Same as wwan_info, but with FLAG_NOARP  */
1151 static const struct driver_info wwan_noarp_info = {
1152         .description = "Mobile Broadband Network Device (NO ARP)",
1153         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1154                         | FLAG_WWAN | FLAG_NOARP,
1155         .bind = cdc_ncm_bind,
1156         .unbind = cdc_ncm_unbind,
1157         .check_connect = cdc_ncm_check_connect,
1158         .manage_power = usbnet_manage_power,
1159         .status = cdc_ncm_status,
1160         .rx_fixup = cdc_ncm_rx_fixup,
1161         .tx_fixup = cdc_ncm_tx_fixup,
1162 };
1163 
1164 static const struct usb_device_id cdc_devs[] = {
1165         /* Ericsson MBM devices like F5521gw */
1166         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1167                 | USB_DEVICE_ID_MATCH_VENDOR,
1168           .idVendor = 0x0bdb,
1169           .bInterfaceClass = USB_CLASS_COMM,
1170           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1171           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1172           .driver_info = (unsigned long) &wwan_info,
1173         },
1174 
1175         /* Dell branded MBM devices like DW5550 */
1176         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1177                 | USB_DEVICE_ID_MATCH_VENDOR,
1178           .idVendor = 0x413c,
1179           .bInterfaceClass = USB_CLASS_COMM,
1180           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1181           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1182           .driver_info = (unsigned long) &wwan_info,
1183         },
1184 
1185         /* Toshiba branded MBM devices */
1186         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1187                 | USB_DEVICE_ID_MATCH_VENDOR,
1188           .idVendor = 0x0930,
1189           .bInterfaceClass = USB_CLASS_COMM,
1190           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1191           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1192           .driver_info = (unsigned long) &wwan_info,
1193         },
1194 
1195         /* tag Huawei devices as wwan */
1196         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1197                                         USB_CLASS_COMM,
1198                                         USB_CDC_SUBCLASS_NCM,
1199                                         USB_CDC_PROTO_NONE),
1200           .driver_info = (unsigned long)&wwan_info,
1201         },
1202 
1203         /* Infineon(now Intel) HSPA Modem platform */
1204         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1205                 USB_CLASS_COMM,
1206                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1207           .driver_info = (unsigned long)&wwan_noarp_info,
1208         },
1209 
1210         /* Generic CDC-NCM devices */
1211         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1212                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1213                 .driver_info = (unsigned long)&cdc_ncm_info,
1214         },
1215         {
1216         },
1217 };
1218 MODULE_DEVICE_TABLE(usb, cdc_devs);
1219 
1220 static struct usb_driver cdc_ncm_driver = {
1221         .name = "cdc_ncm",
1222         .id_table = cdc_devs,
1223         .probe = usbnet_probe,
1224         .disconnect = usbnet_disconnect,
1225         .suspend = usbnet_suspend,
1226         .resume = usbnet_resume,
1227         .reset_resume = usbnet_resume,
1228         .supports_autosuspend = 1,
1229         .disable_hub_initiated_lpm = 1,
1230 };
1231 
1232 module_usb_driver(cdc_ncm_driver);
1233 
1234 MODULE_AUTHOR("Hans Petter Selasky");
1235 MODULE_DESCRIPTION("USB CDC NCM host driver");
1236 MODULE_LICENSE("Dual BSD/GPL");
1237 

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