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[linux-2.6-block.git] / drivers / net / usb / cdc_ncm.c
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900d495a
AO		 1/*
2 * cdc_ncm.c
3 *
c84ff1d6 4 * Copyright (C) ST-Ericsson 2010-2012
900d495a
AO		 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>
c84ff1d6 50#include <linux/hrtimer.h>
900d495a
AO		 51#include <linux/atomic.h>
52#include <linux/usb/usbnet.h>
53#include <linux/usb/cdc.h>
54
c84ff1d6 55#define DRIVER_VERSION "14-Mar-2012"
900d495a
AO		 56
57/* CDC NCM subclass 3.2.1 */
58#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
59
60/* Maximum NTB length */
3f658cde
AO		 61#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
62#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */
900d495a
AO		 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 */
3f658cde 70#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */
900d495a
AO		 71
72/*
73 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
d5ddb4a5 74 * the last NULL entry.
900d495a 75 */
3f658cde 76#define CDC_NCM_DPT_DATAGRAMS_MAX 40
900d495a
AO		 77
78/* Restart the timer, if amount of datagrams is less than given value */
79#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
c84ff1d6
AO		 80#define CDC_NCM_TIMER_PENDING_CNT 2
81#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
900d495a
AO		 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
900d495a
AO		 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 {
900d495a
AO		 95 struct cdc_ncm_data tx_ncm;
96 struct usb_cdc_ncm_ntb_parameters ncm_parm;
c84ff1d6
AO		 97 struct hrtimer tx_timer;
98 struct tasklet_struct bh;
900d495a
AO		 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;
c84ff1d6 118 atomic_t stop;
900d495a
AO		 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;
d5ddb4a5 134 u16 rx_seq;
900d495a 135 u16 connected;
900d495a
AO		 136};
137
c84ff1d6
AO		 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);
900d495a
AO		 141static const struct driver_info cdc_ncm_info;
142static struct usb_driver cdc_ncm_driver;
bc689c97 143static const struct ethtool_ops cdc_ncm_ethtool_ops;
900d495a
AO		 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
900d495a
AO		 168static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
169{
900d495a 170 u32 val;
900d495a
AO		 171 u8 flags;
172 u8 iface_no;
173 int err;
84e77a8b 174 u16 ntb_fmt_supported;
900d495a
AO		 175
176 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
177
36c35416
GS		 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) {
900d495a
AO		 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);
84e77a8b
AO		 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);
900d495a
AO		 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 "
84e77a8b 207 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
900d495a 208 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
84e77a8b 209 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
900d495a 210
84e77a8b
AO		 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;
900d495a
AO		 215
216 /* verify maximum size of received NTB in bytes */
84e77a8b
AO		 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) {
900d495a
AO		 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
84e77a8b
AO		 229 /* inform device about NTB input size changes */
230 if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
84e77a8b
AO		 231
232 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
75bc8ef5
JB		 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
36c35416
GS		 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,
75bc8ef5
JB		 246 0, iface_no, ndp_in_sz, 8, 1000);
247 kfree(ndp_in_sz);
84e77a8b 248 } else {
75bc8ef5
JB		 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
36c35416
GS		 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,
75bc8ef5
JB		 263 0, iface_no, dwNtbInMaxSize, 4, 1000);
264 kfree(dwNtbInMaxSize);
84e77a8b 265 }
75bc8ef5 266size_err:
36c35416 267 if (err < 0)
84e77a8b
AO		 268 pr_debug("Setting NTB Input Size failed\n");
269 }
270
900d495a
AO		 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 */
84e77a8b 321 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
36c35416
GS		 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)
84e77a8b
AO		 329 pr_debug("Setting CRC mode off failed\n");
330 }
900d495a 331
84e77a8b
AO		 332 /* set NTB format, if both formats are supported */
333 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
36c35416
GS		 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)
84e77a8b
AO		 340 pr_debug("Setting NTB format to 16-bit failed\n");
341 }
900d495a 342
84e77a8b 343 ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
900d495a
AO		 344
345 /* set Max Datagram Size (MTU) */
84e77a8b 346 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
75bc8ef5 347 __le16 *max_datagram_size;
84e77a8b 348 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
75bc8ef5
JB		 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
36c35416
GS		 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,
75bc8ef5 361 0, iface_no, max_datagram_size,
36c35416
GS		 362 2, 1000);
363 if (err < 0) {
84e77a8b
AO		 364 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
365 CDC_NCM_MIN_DATAGRAM_SIZE);
366 } else {
75bc8ef5
JB		 367 ctx->max_datagram_size =
368 le16_to_cpu(*max_datagram_size);
84e77a8b 369 /* Check Eth descriptor value */
3f658cde 370 if (ctx->max_datagram_size > eth_max_sz)
84e77a8b 371 ctx->max_datagram_size = eth_max_sz;
3f658cde
AO		 372
373 if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
374 ctx->max_datagram_size =
84e77a8b 375 CDC_NCM_MAX_DATAGRAM_SIZE;
900d495a 376
84e77a8b
AO		 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 */
3f658cde
AO		 382 if (ctx->max_datagram_size !=
383 le16_to_cpu(*max_datagram_size)) {
384 err = usb_control_msg(ctx->udev,
36c35416
GS		 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,
75bc8ef5 390 iface_no, max_datagram_size,
36c35416 391 2, 1000);
3f658cde
AO		 392 if (err < 0)
393 pr_debug("SET_MAX_DGRAM_SIZE failed\n");
394 }
84e77a8b 395 }
3f658cde 396 kfree(max_datagram_size);
900d495a
AO		 397 }
398
3f658cde 399max_dgram_err:
900d495a
AO		 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
900d495a
AO		 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
c796984f 466 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
900d495a 467 if (ctx == NULL)
19694ac8 468 return -ENODEV;
900d495a 469
c84ff1d6
AO		 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);
900d495a
AO		 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;
900d495a
AO		 515 dev->hard_mtu =
516 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
517
84e77a8b
AO		 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;
900d495a
AO		 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) ||
19694ac8 543 (ctx->ether_desc == NULL) || (ctx->control != intf))
900d495a
AO		 544 goto error;
545
546 /* claim interfaces, if any */
19694ac8
AO		 547 temp = usb_driver_claim_interface(driver, ctx->data, dev);
548 if (temp)
549 goto error;
900d495a
AO		 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)
19694ac8 556 goto error2;
900d495a
AO		 557
558 /* initialize data interface */
559 if (cdc_ncm_setup(ctx))
19694ac8 560 goto error2;
900d495a
AO		 561
562 /* configure data interface */
563 temp = usb_set_interface(dev->udev, iface_no, 1);
564 if (temp)
19694ac8 565 goto error2;
900d495a
AO		 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))
19694ac8 572 goto error2;
900d495a
AO		 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)
19694ac8 582 goto error2;
900d495a 583
517cd81c 584 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
900d495a
AO		 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
19694ac8
AO		 603error2:
604 usb_set_intfdata(ctx->control, NULL);
605 usb_set_intfdata(ctx->data, NULL);
606 usb_driver_release_interface(driver, ctx->data);
900d495a
AO		 607error:
608 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
609 dev->data[0] = 0;
19694ac8 610 dev_info(&dev->udev->dev, "bind() failure\n");
900d495a
AO		 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];
19694ac8 617 struct usb_driver *driver = driver_of(intf);
900d495a
AO		 618
619 if (ctx == NULL)
620 return; /* no setup */
621
c84ff1d6
AO		 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
19694ac8
AO		 629 /* disconnect master --> disconnect slave */
630 if (intf == ctx->control && ctx->data) {
631 usb_set_intfdata(ctx->data, NULL);
900d495a 632 usb_driver_release_interface(driver, ctx->data);
19694ac8 633 ctx->data = NULL;
900d495a 634
19694ac8
AO		 635 } else if (intf == ctx->data && ctx->control) {
636 usb_set_intfdata(ctx->control, NULL);
900d495a 637 usb_driver_release_interface(driver, ctx->control);
19694ac8 638 ctx->control = NULL;
900d495a
AO		 639 }
640
19694ac8 641 usb_set_intfdata(ctx->intf, NULL);
900d495a
AO		 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;
36c35416 663 u16 n = 0, index;
84e77a8b 664 u8 ready2send = 0;
900d495a
AO		 665
666 /* if there is a remaining skb, it gets priority */
667 if (skb != NULL)
668 swap(skb, ctx->tx_rem_skb);
669 else
84e77a8b 670 ready2send = 1;
900d495a
AO		 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 */
6c60408e 690 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
900d495a
AO		 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 */
84e77a8b
AO		 718 if (offset >= ctx->tx_max) {
719 ready2send = 1;
900d495a 720 break;
84e77a8b 721 }
900d495a
AO		 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;
84e77a8b 748 ready2send = 1;
900d495a
AO		 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
84e77a8b 791 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
900d495a
AO		 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)
c84ff1d6 799 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
900d495a
AO		 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
6c60408e
AO		 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)))) {
900d495a
AO		 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);
36c35416
GS		 851 index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
852 ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
900d495a
AO		 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);
84e77a8b 863 ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
900d495a 864
36c35416 865 memcpy(((u8 *)skb_out->data) + index,
900d495a
AO		 866 &(ctx->tx_ncm.ndp16),
867 sizeof(ctx->tx_ncm.ndp16));
868
36c35416 869 memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
900d495a
AO		 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;
c84ff1d6 879 ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
900d495a
AO		 880 return skb_out;
881
882exit_no_skb:
c84ff1d6
AO		 883 /* Start timer, if there is a remaining skb */
884 if (ctx->tx_curr_skb != NULL)
885 cdc_ncm_tx_timeout_start(ctx);
900d495a
AO		 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 */
c84ff1d6
AO		 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);
900d495a
AO		 896}
897
c84ff1d6 898static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
900d495a 899{
c84ff1d6
AO		 900 struct cdc_ncm_ctx *ctx =
901 container_of(timer, struct cdc_ncm_ctx, tx_timer);
900d495a 902
c84ff1d6
AO		 903 if (!atomic_read(&ctx->stop))
904 tasklet_schedule(&ctx->bh);
905 return HRTIMER_NORESTART;
906}
900d495a 907
c84ff1d6
AO		 908static void cdc_ncm_txpath_bh(unsigned long param)
909{
910 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
900d495a 911
c84ff1d6
AO		 912 spin_lock_bh(&ctx->mtx);
913 if (ctx->tx_timer_pending != 0) {
914 ctx->tx_timer_pending--;
900d495a 915 cdc_ncm_tx_timeout_start(ctx);
c84ff1d6 916 spin_unlock_bh(&ctx->mtx);
f742aa8a 917 } else if (ctx->netdev != NULL) {
c84ff1d6
AO		 918 spin_unlock_bh(&ctx->mtx);
919 netif_tx_lock_bh(ctx->netdev);
900d495a 920 usbnet_start_xmit(NULL, ctx->netdev);
c84ff1d6 921 netif_tx_unlock_bh(ctx->netdev);
f742aa8a 922 }
900d495a
AO		 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];
900d495a
AO		 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
c84ff1d6 941 spin_lock_bh(&ctx->mtx);
900d495a 942 skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
c84ff1d6 943 spin_unlock_bh(&ctx->mtx);
900d495a
AO		 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;
d5ddb4a5
AO		 956 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
957 int len;
900d495a
AO		 958 int nframes;
959 int x;
960 int offset;
d5ddb4a5
AO		 961 struct usb_cdc_ncm_nth16 *nth16;
962 struct usb_cdc_ncm_ndp16 *ndp16;
963 struct usb_cdc_ncm_dpe16 *dpe16;
900d495a 964
900d495a
AO		 965 if (ctx == NULL)
966 goto error;
967
d5ddb4a5
AO		 968 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
969 sizeof(struct usb_cdc_ncm_ndp16))) {
900d495a
AO		 970 pr_debug("frame too short\n");
971 goto error;
972 }
973
d5ddb4a5 974 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
900d495a 975
d5ddb4a5 976 if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
900d495a 977 pr_debug("invalid NTH16 signature <%u>\n",
d5ddb4a5 978 le32_to_cpu(nth16->dwSignature));
900d495a
AO		 979 goto error;
980 }
981
d5ddb4a5
AO		 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);
900d495a
AO		 986 goto error;
987 }
988
d5ddb4a5
AO		 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));
900d495a
AO		 1001 goto error;
1002 }
1003
d5ddb4a5 1004 ndp16 = (struct usb_cdc_ncm_ndp16 *)(((u8 *)skb_in->data) + len);
900d495a 1005
d5ddb4a5 1006 if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
900d495a 1007 pr_debug("invalid DPT16 signature <%u>\n",
d5ddb4a5 1008 le32_to_cpu(ndp16->dwSignature));
900d495a
AO		 1009 goto error;
1010 }
1011
d5ddb4a5 1012 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
900d495a 1013 pr_debug("invalid DPT16 length <%u>\n",
d5ddb4a5 1014 le32_to_cpu(ndp16->dwSignature));
900d495a
AO		 1015 goto error;
1016 }
1017
d5ddb4a5 1018 nframes = ((le16_to_cpu(ndp16->wLength) -
900d495a
AO		 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
d5ddb4a5 1023 len += sizeof(struct usb_cdc_ncm_ndp16);
900d495a 1024
d5ddb4a5
AO		 1025 if ((len + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) >
1026 skb_in->len) {
900d495a
AO		 1027 pr_debug("Invalid nframes = %d\n", nframes);
1028 goto error;
1029 }
1030
d5ddb4a5 1031 dpe16 = (struct usb_cdc_ncm_dpe16 *)(((u8 *)skb_in->data) + len);
900d495a 1032
d5ddb4a5
AO		 1033 for (x = 0; x < nframes; x++, dpe16++) {
1034 offset = le16_to_cpu(dpe16->wDatagramIndex);
1035 len = le16_to_cpu(dpe16->wDatagramLength);
900d495a
AO		 1036
1037 /*
1038 * CDC NCM ch. 3.7
1039 * All entries after first NULL entry are to be ignored
1040 */
d5ddb4a5 1041 if ((offset == 0) || (len == 0)) {
900d495a
AO		 1042 if (!x)
1043 goto error; /* empty NTB */
1044 break;
1045 }
1046
1047 /* sanity checking */
d5ddb4a5
AO		 1048 if (((offset + len) > skb_in->len) ||
1049 (len > ctx->rx_max) || (len < ETH_HLEN)) {
900d495a 1050 pr_debug("invalid frame detected (ignored)"
f742aa8a 1051 "offset[%u]=%u, length=%u, skb=%p\n",
d5ddb4a5 1052 x, offset, len, skb_in);
900d495a
AO		 1053 if (!x)
1054 goto error;
1055 break;
1056
1057 } else {
1058 skb = skb_clone(skb_in, GFP_ATOMIC);
9e56790a
JJ		 1059 if (!skb)
1060 goto error;
d5ddb4a5 1061 skb->len = len;
900d495a 1062 skb->data = ((u8 *)skb_in->data) + offset;
d5ddb4a5 1063 skb_set_tail_pointer(skb, len);
900d495a
AO		 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,
84e77a8b 1074 struct usb_cdc_speed_change *data)
900d495a 1075{
84e77a8b
AO		 1076 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1077 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
900d495a
AO		 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,
84e77a8b 1118 (struct usb_cdc_speed_change *)urb->transfer_buffer);
900d495a
AO		 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:
84e77a8b
AO		 1146 if (urb->actual_length < (sizeof(*event) +
1147 sizeof(struct usb_cdc_speed_change)))
900d495a
AO		 1148 set_bit(EVENT_STS_SPLIT, &dev->flags);
1149 else
1150 cdc_ncm_speed_change(ctx,
84e77a8b 1151 (struct usb_cdc_speed_change *) &event[1]);
900d495a
AO		 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",
c261344d 1196 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
900d495a
AO		 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,
85e3c65f 1213 .reset_resume = usbnet_resume,
900d495a
AO		 1214 .supports_autosuspend = 1,
1215};
1216
bc689c97 1217static const struct ethtool_ops cdc_ncm_ethtool_ops = {
900d495a
AO		 1218 .get_drvinfo = cdc_ncm_get_drvinfo,
1219 .get_link = usbnet_get_link,
1220 .get_msglevel = usbnet_get_msglevel,
1221 .set_msglevel = usbnet_set_msglevel,
1222 .get_settings = usbnet_get_settings,
1223 .set_settings = usbnet_set_settings,
1224 .nway_reset = usbnet_nway_reset,
1225};
1226
d632eb1b 1227module_usb_driver(cdc_ncm_driver);
900d495a
AO		 1228
1229MODULE_AUTHOR("Hans Petter Selasky");
1230MODULE_DESCRIPTION("USB CDC NCM host driver");
1231MODULE_LICENSE("Dual BSD/GPL");
Linux 6.x block layer and io_uring tree(s)