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cdc_ncm: reduce driver latency in the data path
[deliverable/linux.git] / drivers / net / usb / cdc_ncm.c
CommitLineData
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 */
6c60408e 61#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
900d495a
AO		 62#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* 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 2048 /* bytes */
71
72/*
73 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
74 * the last NULL entry. Any additional datagrams in NTB would be discarded.
75 */
76#define CDC_NCM_DPT_DATAGRAMS_MAX 32
77
84e77a8b
AO		 78/* Maximum amount of IN datagrams in NTB */
79#define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */
80
900d495a
AO		 81/* Restart the timer, if amount of datagrams is less than given value */
82#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
c84ff1d6
AO		 83#define CDC_NCM_TIMER_PENDING_CNT 2
84#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
900d495a
AO		 85
86/* The following macro defines the minimum header space */
87#define CDC_NCM_MIN_HDR_SIZE \
88 (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
89 (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
90
900d495a
AO		 91struct cdc_ncm_data {
92 struct usb_cdc_ncm_nth16 nth16;
93 struct usb_cdc_ncm_ndp16 ndp16;
94 struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
95};
96
97struct cdc_ncm_ctx {
98 struct cdc_ncm_data rx_ncm;
99 struct cdc_ncm_data tx_ncm;
100 struct usb_cdc_ncm_ntb_parameters ncm_parm;
c84ff1d6
AO		 101 struct hrtimer tx_timer;
102 struct tasklet_struct bh;
900d495a
AO		 103
104 const struct usb_cdc_ncm_desc *func_desc;
105 const struct usb_cdc_header_desc *header_desc;
106 const struct usb_cdc_union_desc *union_desc;
107 const struct usb_cdc_ether_desc *ether_desc;
108
109 struct net_device *netdev;
110 struct usb_device *udev;
111 struct usb_host_endpoint *in_ep;
112 struct usb_host_endpoint *out_ep;
113 struct usb_host_endpoint *status_ep;
114 struct usb_interface *intf;
115 struct usb_interface *control;
116 struct usb_interface *data;
117
118 struct sk_buff *tx_curr_skb;
119 struct sk_buff *tx_rem_skb;
120
121 spinlock_t mtx;
c84ff1d6 122 atomic_t stop;
900d495a
AO		 123
124 u32 tx_timer_pending;
125 u32 tx_curr_offset;
126 u32 tx_curr_last_offset;
127 u32 tx_curr_frame_num;
128 u32 rx_speed;
129 u32 tx_speed;
130 u32 rx_max;
131 u32 tx_max;
132 u32 max_datagram_size;
133 u16 tx_max_datagrams;
134 u16 tx_remainder;
135 u16 tx_modulus;
136 u16 tx_ndp_modulus;
137 u16 tx_seq;
138 u16 connected;
900d495a
AO		 139};
140
c84ff1d6
AO		 141static void cdc_ncm_txpath_bh(unsigned long param);
142static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
143static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
900d495a
AO		 144static const struct driver_info cdc_ncm_info;
145static struct usb_driver cdc_ncm_driver;
bc689c97 146static const struct ethtool_ops cdc_ncm_ethtool_ops;
900d495a
AO		 147
148static const struct usb_device_id cdc_devs[] = {
149 { USB_INTERFACE_INFO(USB_CLASS_COMM,
150 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
151 .driver_info = (unsigned long)&cdc_ncm_info,
152 },
153 {
154 },
155};
156
157MODULE_DEVICE_TABLE(usb, cdc_devs);
158
159static void
160cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
161{
162 struct usbnet *dev = netdev_priv(net);
163
164 strncpy(info->driver, dev->driver_name, sizeof(info->driver));
165 strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
166 strncpy(info->fw_version, dev->driver_info->description,
167 sizeof(info->fw_version));
168 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
169}
170
900d495a
AO		 171static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
172{
900d495a 173 u32 val;
900d495a
AO		 174 u8 flags;
175 u8 iface_no;
176 int err;
84e77a8b 177 u16 ntb_fmt_supported;
900d495a
AO		 178
179 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
180
36c35416
GS		 181 err = usb_control_msg(ctx->udev,
182 usb_rcvctrlpipe(ctx->udev, 0),
183 USB_CDC_GET_NTB_PARAMETERS,
184 USB_TYPE_CLASS | USB_DIR_IN
185 | USB_RECIP_INTERFACE,
186 0, iface_no, &ctx->ncm_parm,
187 sizeof(ctx->ncm_parm), 10000);
188 if (err < 0) {
900d495a
AO		 189 pr_debug("failed GET_NTB_PARAMETERS\n");
190 return 1;
191 }
192
193 /* read correct set of parameters according to device mode */
194 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
195 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
196 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
197 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
198 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
84e77a8b
AO		 199 /* devices prior to NCM Errata shall set this field to zero */
200 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
201 ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
900d495a
AO		 202
203 if (ctx->func_desc != NULL)
204 flags = ctx->func_desc->bmNetworkCapabilities;
205 else
206 flags = 0;
207
208 pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
209 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
84e77a8b 210 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
900d495a 211 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
84e77a8b 212 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
900d495a 213
84e77a8b
AO		 214 /* max count of tx datagrams */
215 if ((ctx->tx_max_datagrams == 0) ||
216 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
217 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
900d495a
AO		 218
219 /* verify maximum size of received NTB in bytes */
84e77a8b
AO		 220 if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
221 pr_debug("Using min receive length=%d\n",
222 USB_CDC_NCM_NTB_MIN_IN_SIZE);
223 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
224 }
225
226 if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
900d495a
AO		 227 pr_debug("Using default maximum receive length=%d\n",
228 CDC_NCM_NTB_MAX_SIZE_RX);
229 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
230 }
231
84e77a8b
AO		 232 /* inform device about NTB input size changes */
233 if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
84e77a8b
AO		 234
235 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
75bc8ef5
JB		 236 struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
237
238 ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
239 if (!ndp_in_sz) {
240 err = -ENOMEM;
241 goto size_err;
242 }
243
36c35416
GS		 244 err = usb_control_msg(ctx->udev,
245 usb_sndctrlpipe(ctx->udev, 0),
246 USB_CDC_SET_NTB_INPUT_SIZE,
247 USB_TYPE_CLASS | USB_DIR_OUT
248 | USB_RECIP_INTERFACE,
75bc8ef5
JB		 249 0, iface_no, ndp_in_sz, 8, 1000);
250 kfree(ndp_in_sz);
84e77a8b 251 } else {
75bc8ef5
JB		 252 __le32 *dwNtbInMaxSize;
253 dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
254 GFP_KERNEL);
255 if (!dwNtbInMaxSize) {
256 err = -ENOMEM;
257 goto size_err;
258 }
259 *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
260
36c35416
GS		 261 err = usb_control_msg(ctx->udev,
262 usb_sndctrlpipe(ctx->udev, 0),
263 USB_CDC_SET_NTB_INPUT_SIZE,
264 USB_TYPE_CLASS | USB_DIR_OUT
265 | USB_RECIP_INTERFACE,
75bc8ef5
JB		 266 0, iface_no, dwNtbInMaxSize, 4, 1000);
267 kfree(dwNtbInMaxSize);
84e77a8b 268 }
75bc8ef5 269size_err:
36c35416 270 if (err < 0)
84e77a8b
AO		 271 pr_debug("Setting NTB Input Size failed\n");
272 }
273
900d495a
AO		 274 /* verify maximum size of transmitted NTB in bytes */
275 if ((ctx->tx_max <
276 (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
277 (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
278 pr_debug("Using default maximum transmit length=%d\n",
279 CDC_NCM_NTB_MAX_SIZE_TX);
280 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
281 }
282
283 /*
284 * verify that the structure alignment is:
285 * - power of two
286 * - not greater than the maximum transmit length
287 * - not less than four bytes
288 */
289 val = ctx->tx_ndp_modulus;
290
291 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
292 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
293 pr_debug("Using default alignment: 4 bytes\n");
294 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
295 }
296
297 /*
298 * verify that the payload alignment is:
299 * - power of two
300 * - not greater than the maximum transmit length
301 * - not less than four bytes
302 */
303 val = ctx->tx_modulus;
304
305 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
306 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
307 pr_debug("Using default transmit modulus: 4 bytes\n");
308 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
309 }
310
311 /* verify the payload remainder */
312 if (ctx->tx_remainder >= ctx->tx_modulus) {
313 pr_debug("Using default transmit remainder: 0 bytes\n");
314 ctx->tx_remainder = 0;
315 }
316
317 /* adjust TX-remainder according to NCM specification. */
318 ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
319 (ctx->tx_modulus - 1));
320
321 /* additional configuration */
322
323 /* set CRC Mode */
84e77a8b 324 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
36c35416
GS		 325 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
326 USB_CDC_SET_CRC_MODE,
327 USB_TYPE_CLASS | USB_DIR_OUT
328 | USB_RECIP_INTERFACE,
329 USB_CDC_NCM_CRC_NOT_APPENDED,
330 iface_no, NULL, 0, 1000);
331 if (err < 0)
84e77a8b
AO		 332 pr_debug("Setting CRC mode off failed\n");
333 }
900d495a 334
84e77a8b
AO		 335 /* set NTB format, if both formats are supported */
336 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
36c35416
GS		 337 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
338 USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
339 | USB_DIR_OUT | USB_RECIP_INTERFACE,
340 USB_CDC_NCM_NTB16_FORMAT,
341 iface_no, NULL, 0, 1000);
342 if (err < 0)
84e77a8b
AO		 343 pr_debug("Setting NTB format to 16-bit failed\n");
344 }
900d495a 345
84e77a8b 346 ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
900d495a
AO		 347
348 /* set Max Datagram Size (MTU) */
84e77a8b 349 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
75bc8ef5 350 __le16 *max_datagram_size;
84e77a8b 351 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
75bc8ef5
JB		 352
353 max_datagram_size = kzalloc(sizeof(*max_datagram_size),
354 GFP_KERNEL);
355 if (!max_datagram_size) {
356 err = -ENOMEM;
357 goto max_dgram_err;
358 }
359
36c35416
GS		 360 err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
361 USB_CDC_GET_MAX_DATAGRAM_SIZE,
362 USB_TYPE_CLASS | USB_DIR_IN
363 | USB_RECIP_INTERFACE,
75bc8ef5 364 0, iface_no, max_datagram_size,
36c35416
GS		 365 2, 1000);
366 if (err < 0) {
84e77a8b
AO		 367 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
368 CDC_NCM_MIN_DATAGRAM_SIZE);
75bc8ef5 369 kfree(max_datagram_size);
84e77a8b 370 } else {
75bc8ef5
JB		 371 ctx->max_datagram_size =
372 le16_to_cpu(*max_datagram_size);
84e77a8b
AO		 373 /* Check Eth descriptor value */
374 if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
375 if (ctx->max_datagram_size > eth_max_sz)
376 ctx->max_datagram_size = eth_max_sz;
377 } else {
378 if (ctx->max_datagram_size >
379 CDC_NCM_MAX_DATAGRAM_SIZE)
380 ctx->max_datagram_size =
381 CDC_NCM_MAX_DATAGRAM_SIZE;
382 }
900d495a 383
84e77a8b
AO		 384 if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
385 ctx->max_datagram_size =
386 CDC_NCM_MIN_DATAGRAM_SIZE;
387
388 /* if value changed, update device */
36c35416
GS		 389 err = usb_control_msg(ctx->udev,
390 usb_sndctrlpipe(ctx->udev, 0),
391 USB_CDC_SET_MAX_DATAGRAM_SIZE,
392 USB_TYPE_CLASS | USB_DIR_OUT
393 | USB_RECIP_INTERFACE,
394 0,
75bc8ef5 395 iface_no, max_datagram_size,
36c35416 396 2, 1000);
75bc8ef5
JB		 397 kfree(max_datagram_size);
398max_dgram_err:
36c35416 399 if (err < 0)
84e77a8b
AO		 400 pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
401 }
900d495a 402
900d495a
AO		 403 }
404
405 if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
406 ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
407
408 return 0;
409}
410
411static void
412cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
413{
414 struct usb_host_endpoint *e;
415 u8 ep;
416
417 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
418
419 e = intf->cur_altsetting->endpoint + ep;
420 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
421 case USB_ENDPOINT_XFER_INT:
422 if (usb_endpoint_dir_in(&e->desc)) {
423 if (ctx->status_ep == NULL)
424 ctx->status_ep = e;
425 }
426 break;
427
428 case USB_ENDPOINT_XFER_BULK:
429 if (usb_endpoint_dir_in(&e->desc)) {
430 if (ctx->in_ep == NULL)
431 ctx->in_ep = e;
432 } else {
433 if (ctx->out_ep == NULL)
434 ctx->out_ep = e;
435 }
436 break;
437
438 default:
439 break;
440 }
441 }
442}
443
444static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
445{
446 if (ctx == NULL)
447 return;
448
900d495a
AO		 449 if (ctx->tx_rem_skb != NULL) {
450 dev_kfree_skb_any(ctx->tx_rem_skb);
451 ctx->tx_rem_skb = NULL;
452 }
453
454 if (ctx->tx_curr_skb != NULL) {
455 dev_kfree_skb_any(ctx->tx_curr_skb);
456 ctx->tx_curr_skb = NULL;
457 }
458
459 kfree(ctx);
460}
461
462static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
463{
464 struct cdc_ncm_ctx *ctx;
465 struct usb_driver *driver;
466 u8 *buf;
467 int len;
468 int temp;
469 u8 iface_no;
470
c796984f 471 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
900d495a 472 if (ctx == NULL)
19694ac8 473 return -ENODEV;
900d495a 474
c84ff1d6
AO		 475 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
476 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
477 ctx->bh.data = (unsigned long)ctx;
478 ctx->bh.func = cdc_ncm_txpath_bh;
479 atomic_set(&ctx->stop, 0);
900d495a
AO		 480 spin_lock_init(&ctx->mtx);
481 ctx->netdev = dev->net;
482
483 /* store ctx pointer in device data field */
484 dev->data[0] = (unsigned long)ctx;
485
486 /* get some pointers */
487 driver = driver_of(intf);
488 buf = intf->cur_altsetting->extra;
489 len = intf->cur_altsetting->extralen;
490
491 ctx->udev = dev->udev;
492 ctx->intf = intf;
493
494 /* parse through descriptors associated with control interface */
495 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
496
497 if (buf[1] != USB_DT_CS_INTERFACE)
498 goto advance;
499
500 switch (buf[2]) {
501 case USB_CDC_UNION_TYPE:
502 if (buf[0] < sizeof(*(ctx->union_desc)))
503 break;
504
505 ctx->union_desc =
506 (const struct usb_cdc_union_desc *)buf;
507
508 ctx->control = usb_ifnum_to_if(dev->udev,
509 ctx->union_desc->bMasterInterface0);
510 ctx->data = usb_ifnum_to_if(dev->udev,
511 ctx->union_desc->bSlaveInterface0);
512 break;
513
514 case USB_CDC_ETHERNET_TYPE:
515 if (buf[0] < sizeof(*(ctx->ether_desc)))
516 break;
517
518 ctx->ether_desc =
519 (const struct usb_cdc_ether_desc *)buf;
900d495a
AO		 520 dev->hard_mtu =
521 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
522
84e77a8b
AO		 523 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
524 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
525 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
526 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
900d495a
AO		 527 break;
528
529 case USB_CDC_NCM_TYPE:
530 if (buf[0] < sizeof(*(ctx->func_desc)))
531 break;
532
533 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
534 break;
535
536 default:
537 break;
538 }
539advance:
540 /* advance to next descriptor */
541 temp = buf[0];
542 buf += temp;
543 len -= temp;
544 }
545
546 /* check if we got everything */
547 if ((ctx->control == NULL) || (ctx->data == NULL) ||
19694ac8 548 (ctx->ether_desc == NULL) || (ctx->control != intf))
900d495a
AO		 549 goto error;
550
551 /* claim interfaces, if any */
19694ac8
AO		 552 temp = usb_driver_claim_interface(driver, ctx->data, dev);
553 if (temp)
554 goto error;
900d495a
AO		 555
556 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
557
558 /* reset data interface */
559 temp = usb_set_interface(dev->udev, iface_no, 0);
560 if (temp)
19694ac8 561 goto error2;
900d495a
AO		 562
563 /* initialize data interface */
564 if (cdc_ncm_setup(ctx))
19694ac8 565 goto error2;
900d495a
AO		 566
567 /* configure data interface */
568 temp = usb_set_interface(dev->udev, iface_no, 1);
569 if (temp)
19694ac8 570 goto error2;
900d495a
AO		 571
572 cdc_ncm_find_endpoints(ctx, ctx->data);
573 cdc_ncm_find_endpoints(ctx, ctx->control);
574
575 if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
576 (ctx->status_ep == NULL))
19694ac8 577 goto error2;
900d495a
AO		 578
579 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
580
581 usb_set_intfdata(ctx->data, dev);
582 usb_set_intfdata(ctx->control, dev);
583 usb_set_intfdata(ctx->intf, dev);
584
585 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
586 if (temp)
19694ac8 587 goto error2;
900d495a 588
517cd81c 589 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
900d495a
AO		 590
591 dev->in = usb_rcvbulkpipe(dev->udev,
592 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
593 dev->out = usb_sndbulkpipe(dev->udev,
594 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
595 dev->status = ctx->status_ep;
596 dev->rx_urb_size = ctx->rx_max;
597
598 /*
599 * We should get an event when network connection is "connected" or
600 * "disconnected". Set network connection in "disconnected" state
601 * (carrier is OFF) during attach, so the IP network stack does not
602 * start IPv6 negotiation and more.
603 */
604 netif_carrier_off(dev->net);
605 ctx->tx_speed = ctx->rx_speed = 0;
606 return 0;
607
19694ac8
AO		 608error2:
609 usb_set_intfdata(ctx->control, NULL);
610 usb_set_intfdata(ctx->data, NULL);
611 usb_driver_release_interface(driver, ctx->data);
900d495a
AO		 612error:
613 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
614 dev->data[0] = 0;
19694ac8 615 dev_info(&dev->udev->dev, "bind() failure\n");
900d495a
AO		 616 return -ENODEV;
617}
618
619static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
620{
621 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
19694ac8 622 struct usb_driver *driver = driver_of(intf);
900d495a
AO		 623
624 if (ctx == NULL)
625 return; /* no setup */
626
c84ff1d6
AO		 627 atomic_set(&ctx->stop, 1);
628
629 if (hrtimer_active(&ctx->tx_timer))
630 hrtimer_cancel(&ctx->tx_timer);
631
632 tasklet_kill(&ctx->bh);
633
19694ac8
AO		 634 /* disconnect master --> disconnect slave */
635 if (intf == ctx->control && ctx->data) {
636 usb_set_intfdata(ctx->data, NULL);
900d495a 637 usb_driver_release_interface(driver, ctx->data);
19694ac8 638 ctx->data = NULL;
900d495a 639
19694ac8
AO		 640 } else if (intf == ctx->data && ctx->control) {
641 usb_set_intfdata(ctx->control, NULL);
900d495a 642 usb_driver_release_interface(driver, ctx->control);
19694ac8 643 ctx->control = NULL;
900d495a
AO		 644 }
645
19694ac8 646 usb_set_intfdata(ctx->intf, NULL);
900d495a
AO		 647 cdc_ncm_free(ctx);
648}
649
650static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
651{
652 if (first >= max)
653 return;
654 if (first >= end)
655 return;
656 if (end > max)
657 end = max;
658 memset(ptr + first, 0, end - first);
659}
660
661static struct sk_buff *
662cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
663{
664 struct sk_buff *skb_out;
665 u32 rem;
666 u32 offset;
667 u32 last_offset;
36c35416 668 u16 n = 0, index;
84e77a8b 669 u8 ready2send = 0;
900d495a
AO		 670
671 /* if there is a remaining skb, it gets priority */
672 if (skb != NULL)
673 swap(skb, ctx->tx_rem_skb);
674 else
84e77a8b 675 ready2send = 1;
900d495a
AO		 676
677 /*
678 * +----------------+
679 * | skb_out |
680 * +----------------+
681 * ^ offset
682 * ^ last_offset
683 */
684
685 /* check if we are resuming an OUT skb */
686 if (ctx->tx_curr_skb != NULL) {
687 /* pop variables */
688 skb_out = ctx->tx_curr_skb;
689 offset = ctx->tx_curr_offset;
690 last_offset = ctx->tx_curr_last_offset;
691 n = ctx->tx_curr_frame_num;
692
693 } else {
694 /* reset variables */
6c60408e 695 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
900d495a
AO		 696 if (skb_out == NULL) {
697 if (skb != NULL) {
698 dev_kfree_skb_any(skb);
699 ctx->netdev->stats.tx_dropped++;
700 }
701 goto exit_no_skb;
702 }
703
704 /* make room for NTH and NDP */
705 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
706 ctx->tx_ndp_modulus) +
707 sizeof(struct usb_cdc_ncm_ndp16) +
708 (ctx->tx_max_datagrams + 1) *
709 sizeof(struct usb_cdc_ncm_dpe16);
710
711 /* store last valid offset before alignment */
712 last_offset = offset;
713 /* align first Datagram offset correctly */
714 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
715 /* zero buffer till the first IP datagram */
716 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
717 n = 0;
718 ctx->tx_curr_frame_num = 0;
719 }
720
721 for (; n < ctx->tx_max_datagrams; n++) {
722 /* check if end of transmit buffer is reached */
84e77a8b
AO		 723 if (offset >= ctx->tx_max) {
724 ready2send = 1;
900d495a 725 break;
84e77a8b 726 }
900d495a
AO		 727 /* compute maximum buffer size */
728 rem = ctx->tx_max - offset;
729
730 if (skb == NULL) {
731 skb = ctx->tx_rem_skb;
732 ctx->tx_rem_skb = NULL;
733
734 /* check for end of skb */
735 if (skb == NULL)
736 break;
737 }
738
739 if (skb->len > rem) {
740 if (n == 0) {
741 /* won't fit, MTU problem? */
742 dev_kfree_skb_any(skb);
743 skb = NULL;
744 ctx->netdev->stats.tx_dropped++;
745 } else {
746 /* no room for skb - store for later */
747 if (ctx->tx_rem_skb != NULL) {
748 dev_kfree_skb_any(ctx->tx_rem_skb);
749 ctx->netdev->stats.tx_dropped++;
750 }
751 ctx->tx_rem_skb = skb;
752 skb = NULL;
84e77a8b 753 ready2send = 1;
900d495a
AO		 754 }
755 break;
756 }
757
758 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
759
760 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
761 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
762
763 /* update offset */
764 offset += skb->len;
765
766 /* store last valid offset before alignment */
767 last_offset = offset;
768
769 /* align offset correctly */
770 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
771
772 /* zero padding */
773 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
774 ctx->tx_max);
775 dev_kfree_skb_any(skb);
776 skb = NULL;
777 }
778
779 /* free up any dangling skb */
780 if (skb != NULL) {
781 dev_kfree_skb_any(skb);
782 skb = NULL;
783 ctx->netdev->stats.tx_dropped++;
784 }
785
786 ctx->tx_curr_frame_num = n;
787
788 if (n == 0) {
789 /* wait for more frames */
790 /* push variables */
791 ctx->tx_curr_skb = skb_out;
792 ctx->tx_curr_offset = offset;
793 ctx->tx_curr_last_offset = last_offset;
794 goto exit_no_skb;
795
84e77a8b 796 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
900d495a
AO		 797 /* wait for more frames */
798 /* push variables */
799 ctx->tx_curr_skb = skb_out;
800 ctx->tx_curr_offset = offset;
801 ctx->tx_curr_last_offset = last_offset;
802 /* set the pending count */
803 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
c84ff1d6 804 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
900d495a
AO		 805 goto exit_no_skb;
806
807 } else {
808 /* frame goes out */
809 /* variables will be reset at next call */
810 }
811
812 /* check for overflow */
813 if (last_offset > ctx->tx_max)
814 last_offset = ctx->tx_max;
815
816 /* revert offset */
817 offset = last_offset;
818
819 /*
820 * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
821 * we send buffers as it is. If we get more data, it would be more
822 * efficient for USB HS mobile device with DMA engine to receive a full
823 * size NTB, than canceling DMA transfer and receiving a short packet.
824 */
825 if (offset > CDC_NCM_MIN_TX_PKT)
826 offset = ctx->tx_max;
827
828 /* final zero padding */
829 cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
830
831 /* store last offset */
832 last_offset = offset;
833
6c60408e
AO		 834 if (((last_offset < ctx->tx_max) && ((last_offset %
835 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
836 (((last_offset == ctx->tx_max) && ((ctx->tx_max %
837 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
838 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
900d495a
AO		 839 /* force short packet */
840 *(((u8 *)skb_out->data) + last_offset) = 0;
841 last_offset++;
842 }
843
844 /* zero the rest of the DPEs plus the last NULL entry */
845 for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
846 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
847 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
848 }
849
850 /* fill out 16-bit NTB header */
851 ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
852 ctx->tx_ncm.nth16.wHeaderLength =
853 cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
854 ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
855 ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
36c35416
GS		 856 index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
857 ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
900d495a
AO		 858
859 memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
860 ctx->tx_seq++;
861
862 /* fill out 16-bit NDP table */
863 ctx->tx_ncm.ndp16.dwSignature =
864 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
865 rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
866 sizeof(struct usb_cdc_ncm_dpe16));
867 ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
84e77a8b 868 ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
900d495a 869
36c35416 870 memcpy(((u8 *)skb_out->data) + index,
900d495a
AO		 871 &(ctx->tx_ncm.ndp16),
872 sizeof(ctx->tx_ncm.ndp16));
873
36c35416 874 memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
900d495a
AO		 875 &(ctx->tx_ncm.dpe16),
876 (ctx->tx_curr_frame_num + 1) *
877 sizeof(struct usb_cdc_ncm_dpe16));
878
879 /* set frame length */
880 skb_put(skb_out, last_offset);
881
882 /* return skb */
883 ctx->tx_curr_skb = NULL;
c84ff1d6 884 ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
900d495a
AO		 885 return skb_out;
886
887exit_no_skb:
c84ff1d6
AO		 888 /* Start timer, if there is a remaining skb */
889 if (ctx->tx_curr_skb != NULL)
890 cdc_ncm_tx_timeout_start(ctx);
900d495a
AO		 891 return NULL;
892}
893
894static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
895{
896 /* start timer, if not already started */
c84ff1d6
AO		 897 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
898 hrtimer_start(&ctx->tx_timer,
899 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
900 HRTIMER_MODE_REL);
900d495a
AO		 901}
902
c84ff1d6 903static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
900d495a 904{
c84ff1d6
AO		 905 struct cdc_ncm_ctx *ctx =
906 container_of(timer, struct cdc_ncm_ctx, tx_timer);
900d495a 907
c84ff1d6
AO		 908 if (!atomic_read(&ctx->stop))
909 tasklet_schedule(&ctx->bh);
910 return HRTIMER_NORESTART;
911}
900d495a 912
c84ff1d6
AO		 913static void cdc_ncm_txpath_bh(unsigned long param)
914{
915 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
900d495a 916
c84ff1d6
AO		 917 spin_lock_bh(&ctx->mtx);
918 if (ctx->tx_timer_pending != 0) {
919 ctx->tx_timer_pending--;
900d495a 920 cdc_ncm_tx_timeout_start(ctx);
c84ff1d6 921 spin_unlock_bh(&ctx->mtx);
f742aa8a 922 } else if (ctx->netdev != NULL) {
c84ff1d6
AO		 923 spin_unlock_bh(&ctx->mtx);
924 netif_tx_lock_bh(ctx->netdev);
900d495a 925 usbnet_start_xmit(NULL, ctx->netdev);
c84ff1d6 926 netif_tx_unlock_bh(ctx->netdev);
f742aa8a 927 }
900d495a
AO		 928}
929
930static struct sk_buff *
931cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
932{
933 struct sk_buff *skb_out;
934 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
900d495a
AO		 935
936 /*
937 * The Ethernet API we are using does not support transmitting
938 * multiple Ethernet frames in a single call. This driver will
939 * accumulate multiple Ethernet frames and send out a larger
940 * USB frame when the USB buffer is full or when a single jiffies
941 * timeout happens.
942 */
943 if (ctx == NULL)
944 goto error;
945
c84ff1d6 946 spin_lock_bh(&ctx->mtx);
900d495a 947 skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
c84ff1d6 948 spin_unlock_bh(&ctx->mtx);
900d495a
AO		 949 return skb_out;
950
951error:
952 if (skb != NULL)
953 dev_kfree_skb_any(skb);
954
955 return NULL;
956}
957
958static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
959{
960 struct sk_buff *skb;
961 struct cdc_ncm_ctx *ctx;
962 int sumlen;
963 int actlen;
964 int temp;
965 int nframes;
966 int x;
967 int offset;
968
969 ctx = (struct cdc_ncm_ctx *)dev->data[0];
970 if (ctx == NULL)
971 goto error;
972
973 actlen = skb_in->len;
974 sumlen = CDC_NCM_NTB_MAX_SIZE_RX;
975
976 if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) {
977 pr_debug("frame too short\n");
978 goto error;
979 }
980
981 memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data),
982 sizeof(ctx->rx_ncm.nth16));
983
984 if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) !=
985 USB_CDC_NCM_NTH16_SIGN) {
986 pr_debug("invalid NTH16 signature <%u>\n",
987 le32_to_cpu(ctx->rx_ncm.nth16.dwSignature));
988 goto error;
989 }
990
991 temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength);
992 if (temp > sumlen) {
993 pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen);
994 goto error;
995 }
996
84e77a8b 997 temp = le16_to_cpu(ctx->rx_ncm.nth16.wNdpIndex);
900d495a
AO		 998 if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) {
999 pr_debug("invalid DPT16 index\n");
1000 goto error;
1001 }
1002
1003 memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp,
1004 sizeof(ctx->rx_ncm.ndp16));
1005
1006 if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) !=
1007 USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1008 pr_debug("invalid DPT16 signature <%u>\n",
1009 le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
1010 goto error;
1011 }
1012
1013 if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) <
1014 USB_CDC_NCM_NDP16_LENGTH_MIN) {
1015 pr_debug("invalid DPT16 length <%u>\n",
1016 le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
1017 goto error;
1018 }
1019
1020 nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) -
1021 sizeof(struct usb_cdc_ncm_ndp16)) /
1022 sizeof(struct usb_cdc_ncm_dpe16));
1023 nframes--; /* we process NDP entries except for the last one */
1024
1025 pr_debug("nframes = %u\n", nframes);
1026
1027 temp += sizeof(ctx->rx_ncm.ndp16);
1028
1029 if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) {
1030 pr_debug("Invalid nframes = %d\n", nframes);
1031 goto error;
1032 }
1033
1034 if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) {
1035 pr_debug("Truncating number of frames from %u to %u\n",
1036 nframes, CDC_NCM_DPT_DATAGRAMS_MAX);
1037 nframes = CDC_NCM_DPT_DATAGRAMS_MAX;
1038 }
1039
1040 memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp,
1041 nframes * (sizeof(struct usb_cdc_ncm_dpe16)));
1042
1043 for (x = 0; x < nframes; x++) {
1044 offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex);
1045 temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength);
1046
1047 /*
1048 * CDC NCM ch. 3.7
1049 * All entries after first NULL entry are to be ignored
1050 */
1051 if ((offset == 0) || (temp == 0)) {
1052 if (!x)
1053 goto error; /* empty NTB */
1054 break;
1055 }
1056
1057 /* sanity checking */
1058 if (((offset + temp) > actlen) ||
1059 (temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) {
1060 pr_debug("invalid frame detected (ignored)"
f742aa8a
AO		 1061 "offset[%u]=%u, length=%u, skb=%p\n",
1062 x, offset, temp, skb_in);
900d495a
AO		 1063 if (!x)
1064 goto error;
1065 break;
1066
1067 } else {
1068 skb = skb_clone(skb_in, GFP_ATOMIC);
9e56790a
JJ		 1069 if (!skb)
1070 goto error;
900d495a
AO		 1071 skb->len = temp;
1072 skb->data = ((u8 *)skb_in->data) + offset;
1073 skb_set_tail_pointer(skb, temp);
1074 usbnet_skb_return(dev, skb);
1075 }
1076 }
1077 return 1;
1078error:
1079 return 0;
1080}
1081
1082static void
1083cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
84e77a8b 1084 struct usb_cdc_speed_change *data)
900d495a 1085{
84e77a8b
AO		 1086 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1087 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
900d495a
AO		 1088
1089 /*
1090 * Currently the USB-NET API does not support reporting the actual
1091 * device speed. Do print it instead.
1092 */
1093 if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1094 ctx->tx_speed = tx_speed;
1095 ctx->rx_speed = rx_speed;
1096
1097 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1098 printk(KERN_INFO KBUILD_MODNAME
1099 ": %s: %u mbit/s downlink "
1100 "%u mbit/s uplink\n",
1101 ctx->netdev->name,
1102 (unsigned int)(rx_speed / 1000000U),
1103 (unsigned int)(tx_speed / 1000000U));
1104 } else {
1105 printk(KERN_INFO KBUILD_MODNAME
1106 ": %s: %u kbit/s downlink "
1107 "%u kbit/s uplink\n",
1108 ctx->netdev->name,
1109 (unsigned int)(rx_speed / 1000U),
1110 (unsigned int)(tx_speed / 1000U));
1111 }
1112 }
1113}
1114
1115static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1116{
1117 struct cdc_ncm_ctx *ctx;
1118 struct usb_cdc_notification *event;
1119
1120 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1121
1122 if (urb->actual_length < sizeof(*event))
1123 return;
1124
1125 /* test for split data in 8-byte chunks */
1126 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1127 cdc_ncm_speed_change(ctx,
84e77a8b 1128 (struct usb_cdc_speed_change *)urb->transfer_buffer);
900d495a
AO		 1129 return;
1130 }
1131
1132 event = urb->transfer_buffer;
1133
1134 switch (event->bNotificationType) {
1135 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1136 /*
1137 * According to the CDC NCM specification ch.7.1
1138 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1139 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1140 */
1141 ctx->connected = event->wValue;
1142
1143 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1144 " %sconnected\n",
1145 ctx->netdev->name, ctx->connected ? "" : "dis");
1146
1147 if (ctx->connected)
1148 netif_carrier_on(dev->net);
1149 else {
1150 netif_carrier_off(dev->net);
1151 ctx->tx_speed = ctx->rx_speed = 0;
1152 }
1153 break;
1154
1155 case USB_CDC_NOTIFY_SPEED_CHANGE:
84e77a8b
AO		 1156 if (urb->actual_length < (sizeof(*event) +
1157 sizeof(struct usb_cdc_speed_change)))
900d495a
AO		 1158 set_bit(EVENT_STS_SPLIT, &dev->flags);
1159 else
1160 cdc_ncm_speed_change(ctx,
84e77a8b 1161 (struct usb_cdc_speed_change *) &event[1]);
900d495a
AO		 1162 break;
1163
1164 default:
1165 dev_err(&dev->udev->dev, "NCM: unexpected "
1166 "notification 0x%02x!\n", event->bNotificationType);
1167 break;
1168 }
1169}
1170
1171static int cdc_ncm_check_connect(struct usbnet *dev)
1172{
1173 struct cdc_ncm_ctx *ctx;
1174
1175 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1176 if (ctx == NULL)
1177 return 1; /* disconnected */
1178
1179 return !ctx->connected;
1180}
1181
1182static int
1183cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1184{
1185 return usbnet_probe(udev, prod);
1186}
1187
1188static void cdc_ncm_disconnect(struct usb_interface *intf)
1189{
1190 struct usbnet *dev = usb_get_intfdata(intf);
1191
1192 if (dev == NULL)
1193 return; /* already disconnected */
1194
1195 usbnet_disconnect(intf);
1196}
1197
1198static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1199{
1200 dev->intf->needs_remote_wakeup = status;
1201 return 0;
1202}
1203
1204static const struct driver_info cdc_ncm_info = {
1205 .description = "CDC NCM",
c261344d 1206 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
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AO		 1207 .bind = cdc_ncm_bind,
1208 .unbind = cdc_ncm_unbind,
1209 .check_connect = cdc_ncm_check_connect,
1210 .manage_power = cdc_ncm_manage_power,
1211 .status = cdc_ncm_status,
1212 .rx_fixup = cdc_ncm_rx_fixup,
1213 .tx_fixup = cdc_ncm_tx_fixup,
1214};
1215
1216static struct usb_driver cdc_ncm_driver = {
1217 .name = "cdc_ncm",
1218 .id_table = cdc_devs,
1219 .probe = cdc_ncm_probe,
1220 .disconnect = cdc_ncm_disconnect,
1221 .suspend = usbnet_suspend,
1222 .resume = usbnet_resume,
85e3c65f 1223 .reset_resume = usbnet_resume,
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AO		 1224 .supports_autosuspend = 1,
1225};
1226
bc689c97 1227static const struct ethtool_ops cdc_ncm_ethtool_ops = {
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AO		 1228 .get_drvinfo = cdc_ncm_get_drvinfo,
1229 .get_link = usbnet_get_link,
1230 .get_msglevel = usbnet_get_msglevel,
1231 .set_msglevel = usbnet_set_msglevel,
1232 .get_settings = usbnet_get_settings,
1233 .set_settings = usbnet_set_settings,
1234 .nway_reset = usbnet_nway_reset,
1235};
1236
d632eb1b 1237module_usb_driver(cdc_ncm_driver);
900d495a
AO		 1238
1239MODULE_AUTHOR("Hans Petter Selasky");
1240MODULE_DESCRIPTION("USB CDC NCM host driver");
1241MODULE_LICENSE("Dual BSD/GPL");
Linux kernel - Deliverables
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