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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)
56static bool prefer_mbim = true;
57#else
58static bool prefer_mbim;
59#endif
60module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
61MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
62
63static void cdc_ncm_txpath_bh(unsigned long param);
64static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
65static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
66static struct usb_driver cdc_ncm_driver;
67
68static 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
252out:
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
267static void
268cdc_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
308static 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
326int 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 }
413advance:
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
495error2:
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);
500error:
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}
506EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
507
508void 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}
542EXPORT_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 */
547u8 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}
576EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
577
578static 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
600static 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 */
613static 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
647struct sk_buff *
648cdc_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
800exit_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}
806EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
807
808static 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
817static 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
827static 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
847struct sk_buff *
848cdc_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
868error:
869 if (skb != NULL)
870 dev_kfree_skb_any(skb);
871
872 return NULL;
873}
874EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
875
876/* verify NTB header and return offset of first NDP, or negative error */
877int 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);
920error:
921 return ret;
922}
923EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
924
925/* verify NDP header and return number of datagrams, or negative error */
926int 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
956error:
957 return ret;
958}
959EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
960
961int 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
978next_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 }
1027err_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;
1034error:
1035 return 0;
1036}
1037EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1038
1039static void
1040cdc_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
1063static 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
1113static 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
1124static 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 */
1137static 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 */
1151static 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
1164static 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};
1218MODULE_DEVICE_TABLE(usb, cdc_devs);
1219
1220static 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
1232module_usb_driver(cdc_ncm_driver);
1233
1234MODULE_AUTHOR("Hans Petter Selasky");
1235MODULE_DESCRIPTION("USB CDC NCM host driver");
1236MODULE_LICENSE("Dual BSD/GPL");
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/init.h>
43#include <linux/netdevice.h>
44#include <linux/ctype.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
55#define DRIVER_VERSION "14-Mar-2012"
56
57/* CDC NCM subclass 3.2.1 */
58#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
59
60/* Maximum NTB length */
61#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
62#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */
63
64/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
65#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
66
67#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
68
69/* Default value for MaxDatagramSize */
70#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */
71
72/*
73 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
74 * the last NULL entry.
75 */
76#define CDC_NCM_DPT_DATAGRAMS_MAX 40
77
78/* Restart the timer, if amount of datagrams is less than given value */
79#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
80#define CDC_NCM_TIMER_PENDING_CNT 2
81#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
82
83/* The following macro defines the minimum header space */
84#define CDC_NCM_MIN_HDR_SIZE \
85 (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
86 (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
87
88struct cdc_ncm_data {
89 struct usb_cdc_ncm_nth16 nth16;
90 struct usb_cdc_ncm_ndp16 ndp16;
91 struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
92};
93
94struct cdc_ncm_ctx {
95 struct cdc_ncm_data tx_ncm;
96 struct usb_cdc_ncm_ntb_parameters ncm_parm;
97 struct hrtimer tx_timer;
98 struct tasklet_struct bh;
99
100 const struct usb_cdc_ncm_desc *func_desc;
101 const struct usb_cdc_header_desc *header_desc;
102 const struct usb_cdc_union_desc *union_desc;
103 const struct usb_cdc_ether_desc *ether_desc;
104
105 struct net_device *netdev;
106 struct usb_device *udev;
107 struct usb_host_endpoint *in_ep;
108 struct usb_host_endpoint *out_ep;
109 struct usb_host_endpoint *status_ep;
110 struct usb_interface *intf;
111 struct usb_interface *control;
112 struct usb_interface *data;
113
114 struct sk_buff *tx_curr_skb;
115 struct sk_buff *tx_rem_skb;
116
117 spinlock_t mtx;
118 atomic_t stop;
119
120 u32 tx_timer_pending;
121 u32 tx_curr_offset;
122 u32 tx_curr_last_offset;
123 u32 tx_curr_frame_num;
124 u32 rx_speed;
125 u32 tx_speed;
126 u32 rx_max;
127 u32 tx_max;
128 u32 max_datagram_size;
129 u16 tx_max_datagrams;
130 u16 tx_remainder;
131 u16 tx_modulus;
132 u16 tx_ndp_modulus;
133 u16 tx_seq;
134 u16 rx_seq;
135 u16 connected;
136};
137
138static void cdc_ncm_txpath_bh(unsigned long param);
139static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
140static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
141static const struct driver_info cdc_ncm_info;
142static struct usb_driver cdc_ncm_driver;
143static const struct ethtool_ops cdc_ncm_ethtool_ops;
144
145static const struct usb_device_id cdc_devs[] = {
146 { USB_INTERFACE_INFO(USB_CLASS_COMM,
147 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
148 .driver_info = (unsigned long)&cdc_ncm_info,
149 },
150 {
151 },
152};
153
154MODULE_DEVICE_TABLE(usb, cdc_devs);
155
156static void
157cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
158{
159 struct usbnet *dev = netdev_priv(net);
160
161 strncpy(info->driver, dev->driver_name, sizeof(info->driver));
162 strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
163 strncpy(info->fw_version, dev->driver_info->description,
164 sizeof(info->fw_version));
165 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
166}
167
168static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
169{
170 u32 val;
171 u8 flags;
172 u8 iface_no;
173 int err;
174 u16 ntb_fmt_supported;
175
176 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
177
178 err = usb_control_msg(ctx->udev,
179 usb_rcvctrlpipe(ctx->udev, 0),
180 USB_CDC_GET_NTB_PARAMETERS,
181 USB_TYPE_CLASS | USB_DIR_IN
182 | USB_RECIP_INTERFACE,
183 0, iface_no, &ctx->ncm_parm,
184 sizeof(ctx->ncm_parm), 10000);
185 if (err < 0) {
186 pr_debug("failed GET_NTB_PARAMETERS\n");
187 return 1;
188 }
189
190 /* read correct set of parameters according to device mode */
191 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
192 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
193 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
194 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
195 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
196 /* devices prior to NCM Errata shall set this field to zero */
197 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
198 ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
199
200 if (ctx->func_desc != NULL)
201 flags = ctx->func_desc->bmNetworkCapabilities;
202 else
203 flags = 0;
204
205 pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
206 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
207 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
208 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
209 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
210
211 /* max count of tx datagrams */
212 if ((ctx->tx_max_datagrams == 0) ||
213 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
214 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
215
216 /* verify maximum size of received NTB in bytes */
217 if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
218 pr_debug("Using min receive length=%d\n",
219 USB_CDC_NCM_NTB_MIN_IN_SIZE);
220 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
221 }
222
223 if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
224 pr_debug("Using default maximum receive length=%d\n",
225 CDC_NCM_NTB_MAX_SIZE_RX);
226 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
227 }
228
229 /* inform device about NTB input size changes */
230 if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
231
232 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
233 struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
234
235 ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
236 if (!ndp_in_sz) {
237 err = -ENOMEM;
238 goto size_err;
239 }
240
241 err = usb_control_msg(ctx->udev,
242 usb_sndctrlpipe(ctx->udev, 0),
243 USB_CDC_SET_NTB_INPUT_SIZE,
244 USB_TYPE_CLASS | USB_DIR_OUT
245 | USB_RECIP_INTERFACE,
246 0, iface_no, ndp_in_sz, 8, 1000);
247 kfree(ndp_in_sz);
248 } else {
249 __le32 *dwNtbInMaxSize;
250 dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
251 GFP_KERNEL);
252 if (!dwNtbInMaxSize) {
253 err = -ENOMEM;
254 goto size_err;
255 }
256 *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
257
258 err = usb_control_msg(ctx->udev,
259 usb_sndctrlpipe(ctx->udev, 0),
260 USB_CDC_SET_NTB_INPUT_SIZE,
261 USB_TYPE_CLASS | USB_DIR_OUT
262 | USB_RECIP_INTERFACE,
263 0, iface_no, dwNtbInMaxSize, 4, 1000);
264 kfree(dwNtbInMaxSize);
265 }
266size_err:
267 if (err < 0)
268 pr_debug("Setting NTB Input Size failed\n");
269 }
270
271 /* verify maximum size of transmitted NTB in bytes */
272 if ((ctx->tx_max <
273 (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
274 (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
275 pr_debug("Using default maximum transmit length=%d\n",
276 CDC_NCM_NTB_MAX_SIZE_TX);
277 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
278 }
279
280 /*
281 * verify that the structure alignment is:
282 * - power of two
283 * - not greater than the maximum transmit length
284 * - not less than four bytes
285 */
286 val = ctx->tx_ndp_modulus;
287
288 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
289 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
290 pr_debug("Using default alignment: 4 bytes\n");
291 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
292 }
293
294 /*
295 * verify that the payload alignment is:
296 * - power of two
297 * - not greater than the maximum transmit length
298 * - not less than four bytes
299 */
300 val = ctx->tx_modulus;
301
302 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
303 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
304 pr_debug("Using default transmit modulus: 4 bytes\n");
305 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
306 }
307
308 /* verify the payload remainder */
309 if (ctx->tx_remainder >= ctx->tx_modulus) {
310 pr_debug("Using default transmit remainder: 0 bytes\n");
311 ctx->tx_remainder = 0;
312 }
313
314 /* adjust TX-remainder according to NCM specification. */
315 ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
316 (ctx->tx_modulus - 1));
317
318 /* additional configuration */
319
320 /* set CRC Mode */
321 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
322 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
323 USB_CDC_SET_CRC_MODE,
324 USB_TYPE_CLASS | USB_DIR_OUT
325 | USB_RECIP_INTERFACE,
326 USB_CDC_NCM_CRC_NOT_APPENDED,
327 iface_no, NULL, 0, 1000);
328 if (err < 0)
329 pr_debug("Setting CRC mode off failed\n");
330 }
331
332 /* set NTB format, if both formats are supported */
333 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
334 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
335 USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
336 | USB_DIR_OUT | USB_RECIP_INTERFACE,
337 USB_CDC_NCM_NTB16_FORMAT,
338 iface_no, NULL, 0, 1000);
339 if (err < 0)
340 pr_debug("Setting NTB format to 16-bit failed\n");
341 }
342
343 ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
344
345 /* set Max Datagram Size (MTU) */
346 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
347 __le16 *max_datagram_size;
348 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
349
350 max_datagram_size = kzalloc(sizeof(*max_datagram_size),
351 GFP_KERNEL);
352 if (!max_datagram_size) {
353 err = -ENOMEM;
354 goto max_dgram_err;
355 }
356
357 err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
358 USB_CDC_GET_MAX_DATAGRAM_SIZE,
359 USB_TYPE_CLASS | USB_DIR_IN
360 | USB_RECIP_INTERFACE,
361 0, iface_no, max_datagram_size,
362 2, 1000);
363 if (err < 0) {
364 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
365 CDC_NCM_MIN_DATAGRAM_SIZE);
366 } else {
367 ctx->max_datagram_size =
368 le16_to_cpu(*max_datagram_size);
369 /* Check Eth descriptor value */
370 if (ctx->max_datagram_size > eth_max_sz)
371 ctx->max_datagram_size = eth_max_sz;
372
373 if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
374 ctx->max_datagram_size =
375 CDC_NCM_MAX_DATAGRAM_SIZE;
376
377 if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
378 ctx->max_datagram_size =
379 CDC_NCM_MIN_DATAGRAM_SIZE;
380
381 /* if value changed, update device */
382 if (ctx->max_datagram_size !=
383 le16_to_cpu(*max_datagram_size)) {
384 err = usb_control_msg(ctx->udev,
385 usb_sndctrlpipe(ctx->udev, 0),
386 USB_CDC_SET_MAX_DATAGRAM_SIZE,
387 USB_TYPE_CLASS | USB_DIR_OUT
388 | USB_RECIP_INTERFACE,
389 0,
390 iface_no, max_datagram_size,
391 2, 1000);
392 if (err < 0)
393 pr_debug("SET_MAX_DGRAM_SIZE failed\n");
394 }
395 }
396 kfree(max_datagram_size);
397 }
398
399max_dgram_err:
400 if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
401 ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
402
403 return 0;
404}
405
406static void
407cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
408{
409 struct usb_host_endpoint *e;
410 u8 ep;
411
412 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
413
414 e = intf->cur_altsetting->endpoint + ep;
415 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
416 case USB_ENDPOINT_XFER_INT:
417 if (usb_endpoint_dir_in(&e->desc)) {
418 if (ctx->status_ep == NULL)
419 ctx->status_ep = e;
420 }
421 break;
422
423 case USB_ENDPOINT_XFER_BULK:
424 if (usb_endpoint_dir_in(&e->desc)) {
425 if (ctx->in_ep == NULL)
426 ctx->in_ep = e;
427 } else {
428 if (ctx->out_ep == NULL)
429 ctx->out_ep = e;
430 }
431 break;
432
433 default:
434 break;
435 }
436 }
437}
438
439static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
440{
441 if (ctx == NULL)
442 return;
443
444 if (ctx->tx_rem_skb != NULL) {
445 dev_kfree_skb_any(ctx->tx_rem_skb);
446 ctx->tx_rem_skb = NULL;
447 }
448
449 if (ctx->tx_curr_skb != NULL) {
450 dev_kfree_skb_any(ctx->tx_curr_skb);
451 ctx->tx_curr_skb = NULL;
452 }
453
454 kfree(ctx);
455}
456
457static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
458{
459 struct cdc_ncm_ctx *ctx;
460 struct usb_driver *driver;
461 u8 *buf;
462 int len;
463 int temp;
464 u8 iface_no;
465
466 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
467 if (ctx == NULL)
468 return -ENODEV;
469
470 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
471 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
472 ctx->bh.data = (unsigned long)ctx;
473 ctx->bh.func = cdc_ncm_txpath_bh;
474 atomic_set(&ctx->stop, 0);
475 spin_lock_init(&ctx->mtx);
476 ctx->netdev = dev->net;
477
478 /* store ctx pointer in device data field */
479 dev->data[0] = (unsigned long)ctx;
480
481 /* get some pointers */
482 driver = driver_of(intf);
483 buf = intf->cur_altsetting->extra;
484 len = intf->cur_altsetting->extralen;
485
486 ctx->udev = dev->udev;
487 ctx->intf = intf;
488
489 /* parse through descriptors associated with control interface */
490 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
491
492 if (buf[1] != USB_DT_CS_INTERFACE)
493 goto advance;
494
495 switch (buf[2]) {
496 case USB_CDC_UNION_TYPE:
497 if (buf[0] < sizeof(*(ctx->union_desc)))
498 break;
499
500 ctx->union_desc =
501 (const struct usb_cdc_union_desc *)buf;
502
503 ctx->control = usb_ifnum_to_if(dev->udev,
504 ctx->union_desc->bMasterInterface0);
505 ctx->data = usb_ifnum_to_if(dev->udev,
506 ctx->union_desc->bSlaveInterface0);
507 break;
508
509 case USB_CDC_ETHERNET_TYPE:
510 if (buf[0] < sizeof(*(ctx->ether_desc)))
511 break;
512
513 ctx->ether_desc =
514 (const struct usb_cdc_ether_desc *)buf;
515 dev->hard_mtu =
516 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
517
518 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
519 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
520 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
521 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
522 break;
523
524 case USB_CDC_NCM_TYPE:
525 if (buf[0] < sizeof(*(ctx->func_desc)))
526 break;
527
528 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
529 break;
530
531 default:
532 break;
533 }
534advance:
535 /* advance to next descriptor */
536 temp = buf[0];
537 buf += temp;
538 len -= temp;
539 }
540
541 /* check if we got everything */
542 if ((ctx->control == NULL) || (ctx->data == NULL) ||
543 (ctx->ether_desc == NULL) || (ctx->control != intf))
544 goto error;
545
546 /* claim interfaces, if any */
547 temp = usb_driver_claim_interface(driver, ctx->data, dev);
548 if (temp)
549 goto error;
550
551 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
552
553 /* reset data interface */
554 temp = usb_set_interface(dev->udev, iface_no, 0);
555 if (temp)
556 goto error2;
557
558 /* initialize data interface */
559 if (cdc_ncm_setup(ctx))
560 goto error2;
561
562 /* configure data interface */
563 temp = usb_set_interface(dev->udev, iface_no, 1);
564 if (temp)
565 goto error2;
566
567 cdc_ncm_find_endpoints(ctx, ctx->data);
568 cdc_ncm_find_endpoints(ctx, ctx->control);
569
570 if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
571 (ctx->status_ep == NULL))
572 goto error2;
573
574 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
575
576 usb_set_intfdata(ctx->data, dev);
577 usb_set_intfdata(ctx->control, dev);
578 usb_set_intfdata(ctx->intf, dev);
579
580 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
581 if (temp)
582 goto error2;
583
584 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
585
586 dev->in = usb_rcvbulkpipe(dev->udev,
587 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
588 dev->out = usb_sndbulkpipe(dev->udev,
589 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
590 dev->status = ctx->status_ep;
591 dev->rx_urb_size = ctx->rx_max;
592
593 /*
594 * We should get an event when network connection is "connected" or
595 * "disconnected". Set network connection in "disconnected" state
596 * (carrier is OFF) during attach, so the IP network stack does not
597 * start IPv6 negotiation and more.
598 */
599 netif_carrier_off(dev->net);
600 ctx->tx_speed = ctx->rx_speed = 0;
601 return 0;
602
603error2:
604 usb_set_intfdata(ctx->control, NULL);
605 usb_set_intfdata(ctx->data, NULL);
606 usb_driver_release_interface(driver, ctx->data);
607error:
608 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
609 dev->data[0] = 0;
610 dev_info(&dev->udev->dev, "bind() failure\n");
611 return -ENODEV;
612}
613
614static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
615{
616 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
617 struct usb_driver *driver = driver_of(intf);
618
619 if (ctx == NULL)
620 return; /* no setup */
621
622 atomic_set(&ctx->stop, 1);
623
624 if (hrtimer_active(&ctx->tx_timer))
625 hrtimer_cancel(&ctx->tx_timer);
626
627 tasklet_kill(&ctx->bh);
628
629 /* disconnect master --> disconnect slave */
630 if (intf == ctx->control && ctx->data) {
631 usb_set_intfdata(ctx->data, NULL);
632 usb_driver_release_interface(driver, ctx->data);
633 ctx->data = NULL;
634
635 } else if (intf == ctx->data && ctx->control) {
636 usb_set_intfdata(ctx->control, NULL);
637 usb_driver_release_interface(driver, ctx->control);
638 ctx->control = NULL;
639 }
640
641 usb_set_intfdata(ctx->intf, NULL);
642 cdc_ncm_free(ctx);
643}
644
645static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
646{
647 if (first >= max)
648 return;
649 if (first >= end)
650 return;
651 if (end > max)
652 end = max;
653 memset(ptr + first, 0, end - first);
654}
655
656static struct sk_buff *
657cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
658{
659 struct sk_buff *skb_out;
660 u32 rem;
661 u32 offset;
662 u32 last_offset;
663 u16 n = 0, index;
664 u8 ready2send = 0;
665
666 /* if there is a remaining skb, it gets priority */
667 if (skb != NULL)
668 swap(skb, ctx->tx_rem_skb);
669 else
670 ready2send = 1;
671
672 /*
673 * +----------------+
674 * | skb_out |
675 * +----------------+
676 * ^ offset
677 * ^ last_offset
678 */
679
680 /* check if we are resuming an OUT skb */
681 if (ctx->tx_curr_skb != NULL) {
682 /* pop variables */
683 skb_out = ctx->tx_curr_skb;
684 offset = ctx->tx_curr_offset;
685 last_offset = ctx->tx_curr_last_offset;
686 n = ctx->tx_curr_frame_num;
687
688 } else {
689 /* reset variables */
690 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
691 if (skb_out == NULL) {
692 if (skb != NULL) {
693 dev_kfree_skb_any(skb);
694 ctx->netdev->stats.tx_dropped++;
695 }
696 goto exit_no_skb;
697 }
698
699 /* make room for NTH and NDP */
700 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
701 ctx->tx_ndp_modulus) +
702 sizeof(struct usb_cdc_ncm_ndp16) +
703 (ctx->tx_max_datagrams + 1) *
704 sizeof(struct usb_cdc_ncm_dpe16);
705
706 /* store last valid offset before alignment */
707 last_offset = offset;
708 /* align first Datagram offset correctly */
709 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
710 /* zero buffer till the first IP datagram */
711 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
712 n = 0;
713 ctx->tx_curr_frame_num = 0;
714 }
715
716 for (; n < ctx->tx_max_datagrams; n++) {
717 /* check if end of transmit buffer is reached */
718 if (offset >= ctx->tx_max) {
719 ready2send = 1;
720 break;
721 }
722 /* compute maximum buffer size */
723 rem = ctx->tx_max - offset;
724
725 if (skb == NULL) {
726 skb = ctx->tx_rem_skb;
727 ctx->tx_rem_skb = NULL;
728
729 /* check for end of skb */
730 if (skb == NULL)
731 break;
732 }
733
734 if (skb->len > rem) {
735 if (n == 0) {
736 /* won't fit, MTU problem? */
737 dev_kfree_skb_any(skb);
738 skb = NULL;
739 ctx->netdev->stats.tx_dropped++;
740 } else {
741 /* no room for skb - store for later */
742 if (ctx->tx_rem_skb != NULL) {
743 dev_kfree_skb_any(ctx->tx_rem_skb);
744 ctx->netdev->stats.tx_dropped++;
745 }
746 ctx->tx_rem_skb = skb;
747 skb = NULL;
748 ready2send = 1;
749 }
750 break;
751 }
752
753 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
754
755 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
756 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
757
758 /* update offset */
759 offset += skb->len;
760
761 /* store last valid offset before alignment */
762 last_offset = offset;
763
764 /* align offset correctly */
765 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
766
767 /* zero padding */
768 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
769 ctx->tx_max);
770 dev_kfree_skb_any(skb);
771 skb = NULL;
772 }
773
774 /* free up any dangling skb */
775 if (skb != NULL) {
776 dev_kfree_skb_any(skb);
777 skb = NULL;
778 ctx->netdev->stats.tx_dropped++;
779 }
780
781 ctx->tx_curr_frame_num = n;
782
783 if (n == 0) {
784 /* wait for more frames */
785 /* push variables */
786 ctx->tx_curr_skb = skb_out;
787 ctx->tx_curr_offset = offset;
788 ctx->tx_curr_last_offset = last_offset;
789 goto exit_no_skb;
790
791 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
792 /* wait for more frames */
793 /* push variables */
794 ctx->tx_curr_skb = skb_out;
795 ctx->tx_curr_offset = offset;
796 ctx->tx_curr_last_offset = last_offset;
797 /* set the pending count */
798 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
799 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
800 goto exit_no_skb;
801
802 } else {
803 /* frame goes out */
804 /* variables will be reset at next call */
805 }
806
807 /* check for overflow */
808 if (last_offset > ctx->tx_max)
809 last_offset = ctx->tx_max;
810
811 /* revert offset */
812 offset = last_offset;
813
814 /*
815 * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
816 * we send buffers as it is. If we get more data, it would be more
817 * efficient for USB HS mobile device with DMA engine to receive a full
818 * size NTB, than canceling DMA transfer and receiving a short packet.
819 */
820 if (offset > CDC_NCM_MIN_TX_PKT)
821 offset = ctx->tx_max;
822
823 /* final zero padding */
824 cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
825
826 /* store last offset */
827 last_offset = offset;
828
829 if (((last_offset < ctx->tx_max) && ((last_offset %
830 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
831 (((last_offset == ctx->tx_max) && ((ctx->tx_max %
832 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
833 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
834 /* force short packet */
835 *(((u8 *)skb_out->data) + last_offset) = 0;
836 last_offset++;
837 }
838
839 /* zero the rest of the DPEs plus the last NULL entry */
840 for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
841 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
842 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
843 }
844
845 /* fill out 16-bit NTB header */
846 ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
847 ctx->tx_ncm.nth16.wHeaderLength =
848 cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
849 ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
850 ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
851 index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
852 ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
853
854 memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
855 ctx->tx_seq++;
856
857 /* fill out 16-bit NDP table */
858 ctx->tx_ncm.ndp16.dwSignature =
859 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
860 rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
861 sizeof(struct usb_cdc_ncm_dpe16));
862 ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
863 ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
864
865 memcpy(((u8 *)skb_out->data) + index,
866 &(ctx->tx_ncm.ndp16),
867 sizeof(ctx->tx_ncm.ndp16));
868
869 memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
870 &(ctx->tx_ncm.dpe16),
871 (ctx->tx_curr_frame_num + 1) *
872 sizeof(struct usb_cdc_ncm_dpe16));
873
874 /* set frame length */
875 skb_put(skb_out, last_offset);
876
877 /* return skb */
878 ctx->tx_curr_skb = NULL;
879 ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
880 return skb_out;
881
882exit_no_skb:
883 /* Start timer, if there is a remaining skb */
884 if (ctx->tx_curr_skb != NULL)
885 cdc_ncm_tx_timeout_start(ctx);
886 return NULL;
887}
888
889static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
890{
891 /* start timer, if not already started */
892 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
893 hrtimer_start(&ctx->tx_timer,
894 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
895 HRTIMER_MODE_REL);
896}
897
898static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
899{
900 struct cdc_ncm_ctx *ctx =
901 container_of(timer, struct cdc_ncm_ctx, tx_timer);
902
903 if (!atomic_read(&ctx->stop))
904 tasklet_schedule(&ctx->bh);
905 return HRTIMER_NORESTART;
906}
907
908static void cdc_ncm_txpath_bh(unsigned long param)
909{
910 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
911
912 spin_lock_bh(&ctx->mtx);
913 if (ctx->tx_timer_pending != 0) {
914 ctx->tx_timer_pending--;
915 cdc_ncm_tx_timeout_start(ctx);
916 spin_unlock_bh(&ctx->mtx);
917 } else if (ctx->netdev != NULL) {
918 spin_unlock_bh(&ctx->mtx);
919 netif_tx_lock_bh(ctx->netdev);
920 usbnet_start_xmit(NULL, ctx->netdev);
921 netif_tx_unlock_bh(ctx->netdev);
922 }
923}
924
925static struct sk_buff *
926cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
927{
928 struct sk_buff *skb_out;
929 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
930
931 /*
932 * The Ethernet API we are using does not support transmitting
933 * multiple Ethernet frames in a single call. This driver will
934 * accumulate multiple Ethernet frames and send out a larger
935 * USB frame when the USB buffer is full or when a single jiffies
936 * timeout happens.
937 */
938 if (ctx == NULL)
939 goto error;
940
941 spin_lock_bh(&ctx->mtx);
942 skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
943 spin_unlock_bh(&ctx->mtx);
944 return skb_out;
945
946error:
947 if (skb != NULL)
948 dev_kfree_skb_any(skb);
949
950 return NULL;
951}
952
953static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
954{
955 struct sk_buff *skb;
956 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
957 int len;
958 int nframes;
959 int x;
960 int offset;
961 struct usb_cdc_ncm_nth16 *nth16;
962 struct usb_cdc_ncm_ndp16 *ndp16;
963 struct usb_cdc_ncm_dpe16 *dpe16;
964
965 if (ctx == NULL)
966 goto error;
967
968 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
969 sizeof(struct usb_cdc_ncm_ndp16))) {
970 pr_debug("frame too short\n");
971 goto error;
972 }
973
974 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
975
976 if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
977 pr_debug("invalid NTH16 signature <%u>\n",
978 le32_to_cpu(nth16->dwSignature));
979 goto error;
980 }
981
982 len = le16_to_cpu(nth16->wBlockLength);
983 if (len > ctx->rx_max) {
984 pr_debug("unsupported NTB block length %u/%u\n", len,
985 ctx->rx_max);
986 goto error;
987 }
988
989 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
990 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
991 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
992 pr_debug("sequence number glitch prev=%d curr=%d\n",
993 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
994 }
995 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
996
997 len = le16_to_cpu(nth16->wNdpIndex);
998 if ((len + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
999 pr_debug("invalid DPT16 index <%u>\n",
1000 le16_to_cpu(nth16->wNdpIndex));
1001 goto error;
1002 }
1003
1004 ndp16 = (struct usb_cdc_ncm_ndp16 *)(((u8 *)skb_in->data) + len);
1005
1006 if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1007 pr_debug("invalid DPT16 signature <%u>\n",
1008 le32_to_cpu(ndp16->dwSignature));
1009 goto error;
1010 }
1011
1012 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1013 pr_debug("invalid DPT16 length <%u>\n",
1014 le32_to_cpu(ndp16->dwSignature));
1015 goto error;
1016 }
1017
1018 nframes = ((le16_to_cpu(ndp16->wLength) -
1019 sizeof(struct usb_cdc_ncm_ndp16)) /
1020 sizeof(struct usb_cdc_ncm_dpe16));
1021 nframes--; /* we process NDP entries except for the last one */
1022
1023 len += sizeof(struct usb_cdc_ncm_ndp16);
1024
1025 if ((len + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) >
1026 skb_in->len) {
1027 pr_debug("Invalid nframes = %d\n", nframes);
1028 goto error;
1029 }
1030
1031 dpe16 = (struct usb_cdc_ncm_dpe16 *)(((u8 *)skb_in->data) + len);
1032
1033 for (x = 0; x < nframes; x++, dpe16++) {
1034 offset = le16_to_cpu(dpe16->wDatagramIndex);
1035 len = le16_to_cpu(dpe16->wDatagramLength);
1036
1037 /*
1038 * CDC NCM ch. 3.7
1039 * All entries after first NULL entry are to be ignored
1040 */
1041 if ((offset == 0) || (len == 0)) {
1042 if (!x)
1043 goto error; /* empty NTB */
1044 break;
1045 }
1046
1047 /* sanity checking */
1048 if (((offset + len) > skb_in->len) ||
1049 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1050 pr_debug("invalid frame detected (ignored)"
1051 "offset[%u]=%u, length=%u, skb=%p\n",
1052 x, offset, len, skb_in);
1053 if (!x)
1054 goto error;
1055 break;
1056
1057 } else {
1058 skb = skb_clone(skb_in, GFP_ATOMIC);
1059 if (!skb)
1060 goto error;
1061 skb->len = len;
1062 skb->data = ((u8 *)skb_in->data) + offset;
1063 skb_set_tail_pointer(skb, len);
1064 usbnet_skb_return(dev, skb);
1065 }
1066 }
1067 return 1;
1068error:
1069 return 0;
1070}
1071
1072static void
1073cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
1074 struct usb_cdc_speed_change *data)
1075{
1076 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1077 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1078
1079 /*
1080 * Currently the USB-NET API does not support reporting the actual
1081 * device speed. Do print it instead.
1082 */
1083 if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1084 ctx->tx_speed = tx_speed;
1085 ctx->rx_speed = rx_speed;
1086
1087 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1088 printk(KERN_INFO KBUILD_MODNAME
1089 ": %s: %u mbit/s downlink "
1090 "%u mbit/s uplink\n",
1091 ctx->netdev->name,
1092 (unsigned int)(rx_speed / 1000000U),
1093 (unsigned int)(tx_speed / 1000000U));
1094 } else {
1095 printk(KERN_INFO KBUILD_MODNAME
1096 ": %s: %u kbit/s downlink "
1097 "%u kbit/s uplink\n",
1098 ctx->netdev->name,
1099 (unsigned int)(rx_speed / 1000U),
1100 (unsigned int)(tx_speed / 1000U));
1101 }
1102 }
1103}
1104
1105static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1106{
1107 struct cdc_ncm_ctx *ctx;
1108 struct usb_cdc_notification *event;
1109
1110 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1111
1112 if (urb->actual_length < sizeof(*event))
1113 return;
1114
1115 /* test for split data in 8-byte chunks */
1116 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1117 cdc_ncm_speed_change(ctx,
1118 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1119 return;
1120 }
1121
1122 event = urb->transfer_buffer;
1123
1124 switch (event->bNotificationType) {
1125 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1126 /*
1127 * According to the CDC NCM specification ch.7.1
1128 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1129 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1130 */
1131 ctx->connected = event->wValue;
1132
1133 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1134 " %sconnected\n",
1135 ctx->netdev->name, ctx->connected ? "" : "dis");
1136
1137 if (ctx->connected)
1138 netif_carrier_on(dev->net);
1139 else {
1140 netif_carrier_off(dev->net);
1141 ctx->tx_speed = ctx->rx_speed = 0;
1142 }
1143 break;
1144
1145 case USB_CDC_NOTIFY_SPEED_CHANGE:
1146 if (urb->actual_length < (sizeof(*event) +
1147 sizeof(struct usb_cdc_speed_change)))
1148 set_bit(EVENT_STS_SPLIT, &dev->flags);
1149 else
1150 cdc_ncm_speed_change(ctx,
1151 (struct usb_cdc_speed_change *) &event[1]);
1152 break;
1153
1154 default:
1155 dev_err(&dev->udev->dev, "NCM: unexpected "
1156 "notification 0x%02x!\n", event->bNotificationType);
1157 break;
1158 }
1159}
1160
1161static int cdc_ncm_check_connect(struct usbnet *dev)
1162{
1163 struct cdc_ncm_ctx *ctx;
1164
1165 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1166 if (ctx == NULL)
1167 return 1; /* disconnected */
1168
1169 return !ctx->connected;
1170}
1171
1172static int
1173cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1174{
1175 return usbnet_probe(udev, prod);
1176}
1177
1178static void cdc_ncm_disconnect(struct usb_interface *intf)
1179{
1180 struct usbnet *dev = usb_get_intfdata(intf);
1181
1182 if (dev == NULL)
1183 return; /* already disconnected */
1184
1185 usbnet_disconnect(intf);
1186}
1187
1188static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1189{
1190 dev->intf->needs_remote_wakeup = status;
1191 return 0;
1192}
1193
1194static const struct driver_info cdc_ncm_info = {
1195 .description = "CDC NCM",
1196 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1197 .bind = cdc_ncm_bind,
1198 .unbind = cdc_ncm_unbind,
1199 .check_connect = cdc_ncm_check_connect,
1200 .manage_power = cdc_ncm_manage_power,
1201 .status = cdc_ncm_status,
1202 .rx_fixup = cdc_ncm_rx_fixup,
1203 .tx_fixup = cdc_ncm_tx_fixup,
1204};
1205
1206static struct usb_driver cdc_ncm_driver = {
1207 .name = "cdc_ncm",
1208 .id_table = cdc_devs,
1209 .probe = cdc_ncm_probe,
1210 .disconnect = cdc_ncm_disconnect,
1211 .suspend = usbnet_suspend,
1212 .resume = usbnet_resume,
1213 .reset_resume = usbnet_resume,
1214 .supports_autosuspend = 1,
1215 .disable_hub_initiated_lpm = 1,
1216};
1217
1218static const struct ethtool_ops cdc_ncm_ethtool_ops = {
1219 .get_drvinfo = cdc_ncm_get_drvinfo,
1220 .get_link = usbnet_get_link,
1221 .get_msglevel = usbnet_get_msglevel,
1222 .set_msglevel = usbnet_set_msglevel,
1223 .get_settings = usbnet_get_settings,
1224 .set_settings = usbnet_set_settings,
1225 .nway_reset = usbnet_nway_reset,
1226};
1227
1228module_usb_driver(cdc_ncm_driver);
1229
1230MODULE_AUTHOR("Hans Petter Selasky");
1231MODULE_DESCRIPTION("USB CDC NCM host driver");
1232MODULE_LICENSE("Dual BSD/GPL");